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Spero Therapeutics, Inc.

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FY2020 Annual Report · Spero Therapeutics, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)

☒

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2020

or

☐

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition
period from ____to____

Commission file number 001-38266

SPERO THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

Delaware

State or other jurisdiction of
incorporation or organization

675 Massachusetts Avenue, 14th  Floor
Cambridge, Massachusetts

(Address of principal executive offices)

46-4590683

(I.R.S. Employer
Identification No.)

02139

(Zip Code)

Registrant’s telephone number, including area code (857) 242-1600

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, $0.001 par value per share

Trading Symbol(s)
SPRO

Name of each exchange on which registered
The Nasdaq Global Select Market

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the
preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past
90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T
(§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth
company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange
Act.

Large accelerated filer
Non-accelerated filer

  ☐
  ☒

  Accelerated filer
  Smaller reporting company
  Emerging growth company

☐
☒
☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised
financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☒

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial
reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes ☐    No ☒

The aggregate market value of Common Stock held by non-affiliates of the registrant computed by reference to the price of the registrant’s Common Stock as of June 30,
2020, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $256.2 million (based on the last reported sale price on the
Nasdaq Global Market as of such date). As of March 8, 2021, there were 29,504,257 shares of the registrant’s Common Stock, $0.001 par value per share, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The registrant intends to file a definitive proxy statement pursuant to Regulation 14A relating to the 2021 Annual Meeting of Stockholders within 120 days of the end of the
registrant’s fiscal year ended December 31, 2020. Portions of such definitive proxy statement are incorporated by reference into Part III of this Annual Report on Form 10-K
to the extent stated herein.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

  Business
  Risk Factors
  Unresolved Staff Comments
  Properties
  Legal Proceedings
  Mine Safety Disclosures

  Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 

Securities

  Selected Financial Data
  Management’s Discussion and Analysis of Financial Condition and Results of Operations
  Quantitative and Qualitative Disclosures About Market Risk
  Financial Statements and Supplementary Data
  Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
  Controls and Procedures
  Other Information

  Directors, Executive Officers and Corporate Governance
  Executive Compensation
  Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
  Certain Relationships and Related Transactions, and Director Independence
  Principal Accounting Fees and Services

  Exhibits, Financial Statement Schedules
  Form 10-K Summary

PART I
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

PART II
Item 5.

Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV
Item 15.
Item 16.

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Forward-Looking Information

PART I

This Annual Report on Form 10-K contains forward-looking statements that involve risks and uncertainties. We make such forward-looking
statements pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All statements
other than statements of historical facts contained in this Annual Report on Form 10-K are forward-looking statements. In some cases, you can identify
forward-looking statements by terminology such as “may,” “will,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,”
“predicts,” “potential,” “continue” or the negative of these terms or other comparable terminology. These forward-looking statements include, but are not
limited to, statements about:

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the initiation, timing, design, progress and results of, including interim data from, our preclinical studies and clinical trials, and our
research and development programs;

the timing and outcome of the New Drug Application approval process for tebipenem HBr;

our ability to retain the continued service of our key professionals and to identify, hire and retain additional qualified professionals;

our ability to advance product candidates into, and successfully complete, clinical trials;

the timing or likelihood of regulatory filings and approvals;

the direct and indirect impact of the pandemic caused by an outbreak of a new strain of coronavirus, or COVID-19, on our business and
operations, including manufacturing, research and development costs, clinical trials, regulatory processes and employee expenses;

the commercialization of our product candidates, if approved;

the pricing, coverage and reimbursement of our product candidates, if approved;

the implementation of our business model and strategic plans for our business and product candidates;

the scope of protection we are able to establish and maintain for intellectual property rights covering our product candidates;

our ability to enter into strategic arrangements and/or collaborations and the potential benefits of such arrangements;

our estimates regarding expenses, capital requirements and needs for additional financing;

our ability to continue as a going concern;

our financial performance;

developments relating to our competitors and our industry; and

other risks and uncertainties, including those listed under Part I, Item 1A. “Risk Factors”.

Any forward-looking statements in this Annual Report on Form 10-K reflect our current views with respect to future events or to our future financial

performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be
materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Factors that may
cause actual results to differ materially from current expectations include, among other things, those listed under Part I Item 1A. “Risk Factors” and
elsewhere in this Annual Report on Form 10-K. Given these uncertainties, you should not place undue reliance on these forward-looking statements.
Except as required by law, we assume no obligation to update or revise these forward-looking statements for any reason, even if new information becomes
available in the future.

This Annual Report on Form 10-K also contains estimates, projections and other information concerning our industry, our business, and the markets

for certain diseases, including data regarding the estimated size of those markets, and the incidence and prevalence of certain medical conditions.
Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties and actual
events or circumstances may differ materially from events and circumstances reflected in this information. Unless otherwise expressly stated, we obtained
this industry, business, market and other data from reports, research surveys, studies and similar data prepared by market research firms and other third
parties, industry, medical and general publications, government data and similar sources.

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Risk Factor Summary

We are providing the following summary of the risk factors contained in this Annual Report on Form 10-K to enhance the readability and

accessibility of our risk factor disclosures. We encourage you to carefully review the full risk factors contained in this Annual Report on Form 10-K in their
entirety for additional information regarding the material factors that make an investment in our securities speculative or risky. These risks and
uncertainties include, but are not limited to, the following:

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The outbreak of the novel strain of coronavirus, SARS-CoV-2, which causes COVID-19, could adversely impact our business, including
our preclinical studies and clinical trials.

We have not generated any revenue from the sale of our products, have a history of losses and expect to incur substantial future losses.
The report of our auditor on our consolidated financial statements expresses substantial doubt about our ability to continue as a going
concern; if we are unable to obtain additional capital, we may not be able to continue our operations on the scope or scale as currently
conducted, and that could have a material adverse effect on our business, results of operations and financial condition.

We expect that we will need substantial additional funding. If we are unable to raise capital when needed, or do not receive payment under
our government awards, we could be forced to delay, reduce or eliminate our product development programs or commercialization efforts.

We are heavily dependent on the success of tebipenem HBr, which is still under development, and our ability to develop, obtain marketing
approval for and successfully commercialize tebipenem HBr. If we are unable to develop, obtain marketing approval for and successfully
commercialize tebipenem HBr, or if we experience significant delays in doing so, our business could be materially harmed.

If clinical trials of our product candidates fail to demonstrate safety and efficacy to the satisfaction of the FDA or comparable foreign
regulatory authorities or do not otherwise produce favorable results, we may incur additional costs or experience delays in completing, or
ultimately be unable to complete, the development and commercialization of such product candidates.

To support our accelerated clinical development strategy for tebipenem HBr, we are relying, in part, on clinical data from two exploratory
Phase 2 clinical trials conducted by Meiji (ME1211) and Global Pharma (L-084 04) in Japan, which were not conducted in accordance
with FDA guidance for clinical trials in patients with cUTI. To the extent that these clinical trial design differences limit our use of the
clinical data, our proposed clinical trial plan for tebipenem HBr with the FDA could be materially delayed and we may incur material
additional costs.

Preliminary or interim data from our clinical studies that we announce or publish from time to time may change as more patient data
become available and are subject to audit and verification procedures that could result in material changes in the final data.

Serious adverse events or undesirable side effects or other unexpected properties of tebipenem HBr or any other product candidate may be
identified during development or after approval that could delay, prevent or cause the withdrawal of regulatory approval, limit the
commercial potential, or result in significant negative consequences following marketing approval.

Even if a product candidate does obtain regulatory approval, it may never achieve the market acceptance by physicians, patients, hospitals,
third-party payors and others in the medical community that is necessary for commercial success and the market opportunity may be
smaller than we estimate.

If we are unable to establish sales, marketing and distribution capabilities or enter into sales, marketing and distribution agreements with
third parties, we may not be successful in commercializing tebipenem HBr or any other product candidate if such product candidate is
approved.

We face substantial competition from other pharmaceutical and biotechnology companies and our operating results may suffer if we fail to
compete effectively.

We expect to depend on collaborations with third parties for the development and commercialization of some of our product candidates.
Our prospects with respect to those product candidates will depend in part on the success of those collaborations.

We contract with third parties for the manufacture of preclinical and clinical supplies of our product candidates and expect to continue to
do so in connection with any future commercialization and for any future clinical trials and commercialization of our other product
candidates and potential product candidates. This reliance on third parties increases the risk that we will not have sufficient quantities of
our product candidates or such quantities at an acceptable cost, which could delay, prevent or impair our development or
commercialization efforts.

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Our use of government funding for certain of our programs adds complexity to our research and commercialization efforts with respect to
those programs and may impose requirements that increase the costs of commercialization and production of product candidates
developed under those government-funded programs.

If we are unable to obtain and maintain sufficient patent protection for our technology or our product candidates, or if the scope of the
patent protection is not sufficiently broad, our competitors could develop and commercialize technology and products similar or identical
to ours, and our ability to successfully commercialize our technology and product candidates may be adversely affected.

We have registered trademarks and pending trademark applications. Failure to enforce our registered marks or secure registration of our
pending trademark applications could adversely affect our business.

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we will not be able to commercialize
tebipenem HBr or our other product candidates, and our ability to generate revenue will be materially impaired.

Item 1. Business.

Overview

We are a multi-asset, clinical-stage biopharmaceutical company focused on identifying, developing and commercializing treatments in high unmet

need areas involving multi-drug resistant, or MDR, bacterial infections and rare diseases. Our most advanced product candidate, Tebipenem Pivoxil
Hydrobromide, or tebipenem HBr, is designed to be the first oral carbapenem-class antibiotic for use in adults to treat MDR Gram-negative infections.
Treatment with effective orally administrable antibiotics may prevent hospitalizations for serious infections and enable earlier, more convenient and cost-
effective treatment of patients after hospitalization. We are also developing SPR720, a novel oral antibiotic designed for the treatment of a rare, orphan
disease caused by non-tuberculous mycobacterial pulmonary infections, or NTM disease. In addition, we are advancing SPR206, a next generation
polymyxin investigational product candidate, being developed as an IV-administered medicine to treat MDR Gram-negative infections in the hospital. We
believe that our novel product candidates, if successfully developed and approved, would have a meaningful patient impact and significant commercial
applications for the treatment of MDR infections in both the community and hospital settings.

Antibiotic-resistant bacteria are one of the largest threats to global health, and their prevalence is increasing. While the majority of life-threatening
infections historically resulting from antibiotic-resistant bacteria are acquired in the hospital setting, there is an increasing incidence of MDR pathogens in
the community setting. Antibiotics used currently for first-line empiric treatment of MDR bacterial infections suffer from significant limitations and risks,
including narrow spectrums of coverage and safety and tolerability concerns, and they can be associated with serious adverse effects. In addition, there are
no oral antibiotics commercially available that can reliably be used in adults with MDR Gram-negative bacterial infections. This limits the ability of
physicians to prevent hospitalizations and transition patients to their home from the hospital after receiving IV-administered therapy. The increasing
prevalence of drug resistance and MDR Gram-negative bacteria, as well as the limitations of existing therapies and traditional drug development
approaches, highlight the critical need for novel therapies, and in particular orally administrable agents, that are capable of overcoming these obstacles to
effective patient treatment.

The Problem:  Increasingly Limited Antibiotic Options for Severe Infections

Antibiotic Background

Antibiotics are drugs used to treat infections that are caused by bacteria. Prior to the introduction of the first antibiotics in the 1930s and 1940s,

bacterial infections were often fatal. Today, antibiotics are used routinely to treat and prevent infections. There are two main varieties of bacteria, Gram-
negative bacteria and Gram-positive bacteria, which are distinguished by structural differences in their cell envelope. Gram-positive bacteria are
surrounded by a single lipid membrane and a thick cell wall, while Gram-negative bacteria are encircled by two lipid membranes, an inner membrane and
an outer membrane, with a thinner cell wall in between, as shown in the illustration below.

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Antibiotics that target Gram-negative bacteria must be specifically designed to cross both the inner and outer membranes to enter the bacteria. The

outer membrane, with its LPS-containing outer leaflet, represents a significant barrier to the entry into the bacteria by antibiotics and is a significant
contributor toward reduced potency of many agents in treating Gram-negative bacterial infections. Recent studies have found that Gram-negative bacteria
in certain patient types, such as those with sepsis and Interstitial Lung Disease, are associated with higher mortality and increased intensive care unit, or
ICU, admission. Moreover, a study of 13,796 patients in intensive care units around the world reported in 2009 that 51% of patients experienced bacterial
infections, and of these patients 62% were infected by Gram-negative organisms.

Antibiotics are evaluated according to several criteria, including:

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Spectrum. Antibiotics that are effective against a wide variety of bacteria are considered to be broad-spectrum, while those that act upon
only a limited number of bacteria are considered to be narrow-spectrum.

Potency. Potency is the measure of the microbiological ability of an antibiotic to kill or inhibit growth of bacteria in vitro. Potency is
commonly expressed as the minimum inhibitory concentration, or MIC, in µg/mL, which is the lowest concentration at which the drug
inhibits growth of the bacteria. Antibiotics with lower MICs are considered to be more potent.

Resistance. Antibiotic resistance refers to the inability of an antibiotic to effectively control bacterial growth. Some bacteria are naturally
resistant to certain types of antibiotics. Antibiotic resistance can also occur due to genetic mutations or changes in gene expression. There
are numerous mechanisms responsible for antibiotic resistance, and resistance mechanisms are often found together and can be transferred
between different bacteria, leading to multi-drug resistance.

Growing Antibiotic Resistance in the Hospital and Community Settings

Antibiotic resistance is one of the largest threats to global health, and resistance rates are increasing. Antibiotic resistance can affect anyone, of any
age and in any country. According to the U.S. Centers for Disease Control’s Antibiotic Resistance Threats in the United States, 2019 report, more than 2.8
million antibiotic-resistant infections occur in the United States each year, and more than 35,000 people die as a result. Approximately 70% of the
pathogens that cause these infections are resistant to at least one antibiotic used to treat them. Resistance rates are climbing in both hospital-acquired and
community-acquired infections. According to UNC Infectious Diseases investigator David van Duin, MD, PhD and colleagues in 2016: “Some MDR
bacteria have become quite prevalent causes of community-acquired infections. The spread of MDR bacteria into the community is a crucial development,
and is associated with increased morbidity, mortality, healthcare costs and antibiotic use.” The incidence rate of serious infections is increasing, and the
proportion of the infections caused by MDR pathogens is increasingly seen as an emerging threat to world health. The Centers for Disease Control and
Prevention, or CDC, estimates that the annual impact of antibiotic-resistant infections on the United States economy is $20-35 billion in excess direct
health care costs.

According to the CDC, among all of the bacterial resistance problems, Gram-negative pathogens, which cause a majority of all bacterial infections,

are particularly worrisome because they are becoming resistant to nearly all drugs that would be considered for treatment. In February 2017, the World
Health Organization, or WHO, published a list of Gram- negative bacteria based on the urgency of need for new antibiotics and highlighted a critical group
of MDR Gram-negative bacteria that pose a particular threat to human health, including Acinetobacter, Pseudomonas and multiple Enterobacteriaceae
(including Klebsiella sp., E. coli, Serratia and Proteus). These pathogens are associated with significant mortality because the increased incidence of
antibiotic resistance has limited the number of effective treatment options.

There is an acute need for new antibiotics to treat MDR bacterial infections, as few new antibiotics capable of addressing such infections have been
approved recently for commercialization or are in clinical development. Further, the majority of MDR bacterial infections historically have been acquired
in the hospital setting, where they have been treated using IV-administered antibiotics. However, increasingly such infections are being acquired in the
community setting, emphasizing the need for orally administrable antibiotics that can effectively treat such infections.

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Chronic Bacterial Infection without a Viable Cure

NTM infections represent a growing global health concern and major unmet medical need because of the lack of new medications being developed

to combat these bacteria. NTM infections are ubiquitous environmental pathogens that can cause progressive lung damage and respiratory failure,
particularly in patients with compromised immune systems or underlying pulmonary disorders.

Although rare, the incidence of pulmonary NTM disease is increasing worldwide. It is estimated that approximately 130,000 patients suffer from

NTM disease in the United States and Europe, a figure that is growing at a rate of 8% annually. In addition, many patients go undiagnosed and could
benefit from treatment with additional testing. The elderly and people with compromised immune or lung function are at greatest risk, as are patients with
bronchiectasis for whom it is estimated that up to 50% may also have active lung infection caused by NTM. Treatment of pulmonary NTM disease requires
prolonged therapy (continuing for approximately 12 to 24 months) with a combination regimen and is frequently complicated by tolerability and/or toxicity
issues. Additionally, there are currently no oral antibiotics specifically approved for use to treat pulmonary NTM disease. M. avium complex is the most
common NTM to cause human infection in the United States, and it makes up around 80% of the infections.

The most common treatment for NTM infections is combination therapy with drugs traditionally used for tuberculosis, or TB, which have limited
efficacy and high toxicity. NTM infection is also associated with high healthcare costs and high mortality. In 2014, the annual cost in the United States of
treating NTM infections alone was estimated at $1.7 billion.

Our Solution

Antibiotics currently used for first-line empiric treatment of MDR acute bacterial infections and NTM infection suffer from significant limitations.

We believe that our product candidates will overcome these limitations, as described below:

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Tebipenem HBr is designed to address the lack of orally administrable antibiotics to prevent hospitalization and permit IV-to-oral
switch therapy in resistant Gram-negative infections. Resistance to most commonly used classes of oral antibiotics, such as
cephalosporins and fluoroquinolones, has increased significantly. Many of the most commonly used antibiotics for MDR Gram-negative
infections are only available in an IV-administered formulation. Treatment with effective orally administrable antibiotics may prevent
hospitalizations for serious infections and enable earlier, more convenient and cost-effective treatment of patients following
hospitalization. Tebipenem HBr is an orally administrable tablet that we believe has the potential, if approved, to treat such infections in
both the community and hospital settings, thereby preventing certain hospitalizations and enabling patients to transition to oral treatment.
In the community setting, tebipenem HBr, if successfully developed and approved, may allow patients who develop an infection with a
resistant pathogen, but are stable enough to be treated in the community, to avoid the need for an IV catheter and even hospitalization.
Hospitalization is a key cost driver for hospital systems and payers, with increasing emphasis being placed on hospital avoidance. In the
hospital setting, the lack of effective oral stepdown options results in the potential for lengthy hospital stays or the insertion of a
peripherally inserted central catheter, or PICC, to facilitate outpatient administration of IV antibiotics. Tebipenem HBr may enable faster
discharges, providing cost-saving advantages for the hospital and mitigating the risk of catheter-related and other hospital-acquired
infections for patients.

SPR720 is designed to be the first oral treatment for NTM infection where treatment failure is common and no approved therapies
exist. The current treatment for NTM infection is lengthy and involves combination therapy, often including three or more antibiotics,
including injectables. None of these combination treatments are currently approved for use in NTM infection. Treatment failure is
common and is often due to poor compliance or patients’ inability to tolerate the regimen. Many patients experience progressive lung
disease as a result of NTM infection, and mortality rates are high, ranging from 29% to 69% within five years of diagnosis. We believe
SPR720, if successfully developed, has the potential to be the first approved oral agent for NTM pulmonary infection. We initiated a
Phase 2a clinical trial in patients with NTM pulmonary disease in December 2020 based on data from the Phase 1 clinical trial,
pharmacokinetic analyses and preclinical studies supporting its advancement. On February 5, 2021, we announced that the FDA informed
us that a clinical hold had been placed on our Phase 2a clinical trial of SPR720, which is further described elsewhere in this “Business”
section of our Annual Report on Form 10-K under the heading “Update on Phase 2a Clinical Trial.”

SPR206 is designed to address the decline in the ability of novel and effective IV-administered antibiotics to treat MDR Gram-negative
infections in the hospital setting. First-line IV empiric antibiotics, such as levofloxacin, ceftazidime and piperacillin-tazobactam, have
experienced diminished utility as the number of bacterial strains resistant to these antibiotics in the hospital has increased. Due to gaps in
the spectrum of coverage of antibiotics currently on the market, physicians are often confronted with the need to design complicated
multi-drug cocktails for patients with serious infections. Based on results from preclinical studies to date, we believe that SPR206 has the
potential to be developed as a single drug.

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Our Pipeline – Multiple Near-term Catalysts Across the Rare and Infectious Disease Portfolio

The following table sets forth our product candidates, their status and certain anticipated milestones related to them.

Our Product Candidates

Tebipenem HBr (tebipenem pivoxil hydrobromide): Novel Antibiotic with Potential to be the First Oral Carbapenem for Use in Adults

Our lead product candidate, tebipenem HBr, is an oral carbapenem intended for use in adults to treat MDR Gram-negative infections. In September

2020, we announced positive top-line data from the single pivotal Phase 3 clinical trial, which is entitled ADAPT-PO, that is required for approval of
tebipenem HBr to treat complicated urinary tract infection, or cUTI, and acute pyelonephritis, or AP. The ADAPT-PO trial achieved its primary objective,
demonstrating that oral tebipenem HBr was statistically non-inferior to intravenous ertapenem in the treatment of patients with cUTI and patients with AP
with respect to the primary endpoint of overall response at the test-of-cure, or TOC, visit in the microbiological-intent-to-treat, or micro-ITT, population.
Comparative safety and tolerability data from 1,372 hospitalized adult patients enrolled in the study were similar between the tebipenem HBr and
ertapenem treatment groups. The ADAPT-PO trial was designed as a double-blind, double-dummy trial to compare oral tebipenem HBr with an existing
standard of care intravenous, or IV, antibiotic, ertapenem, in 1,372 hospitalized adult patients with cUTI or AP, randomized 1:1 in each arm. We intend to
make a New Drug Application, or NDA, submission to the United States Food and Drug Administration, or FDA, for tebipenem HBr for the treatment of
cUTI and AP in the second half of 2021.

Carbapenems have been utilized for over 30 years and are considered the standard of care for many serious MDR Gram-negative bacterial
infections, but to date they have only been available as IV-administered formulations. Currently, there are no commercially available oral carbapenems for
use in adults, and we believe tebipenem HBr has the potential to address this unmet need. Tebipenem HBr is an oral tablet formulation of tebipenem, a
carbapenem-class antibiotic marketed by Meiji Seika Pharma Co. Ltd., or Meiji, in Japan as Orapenem® since 2009 for common pediatric infections. To
accelerate our clinical development of tebipenem HBr, in June 2017 we signed an exclusive license to certain data and know-how from Meiji and a global
pharmaceutical company, to which we refer as Global Pharma, which we intend to use to support our clinical development of tebipenem HBr. We have
global commercialization rights to tebipenem HBr, except in certain contractually specified Asian countries.

The FDA has designated tebipenem HBr as a Qualified Infectious Disease Product, or QIDP, for the treatment of cUTI, community acquired
bacterial pneumonia, or CABP, and moderate to severe diabetic foot infections, or DFI, under the Generating Antibiotics Incentives Now Act, or the GAIN
Act. Among other benefits of a QIDP designation, the first marketing application for the QIDP-designated drug qualifies for priority review by the FDA. If
tebipenem HBr is approved for treatment of cUTI, CABP or DFI, the QIDP designation previously granted to tebipenem HBr for those indications will
entitle the drug product to receive a one-time five-year extension to any non-patent exclusivity period awarded for tebipenem HBr in the United States (the
so-called GAIN exclusivity extension), such as a five-year New Chemical Entity, or NCE, exclusivity granted under the Drug Price Competition and Patent
Term Restoration Act of 1984, or the Hatch-Waxman Act, for a total of 10 years, among other possible qualifying periods of regulatory exclusivity. In
Europe, exclusivity for NCEs is 10 years (eight years for data exclusivity and an additional two years for market exclusivity), with the possibility of a one-
year extension if the chemical entity is approved for use in an additional indication. The QIDP designation for tebipenem HBr, however, does not guarantee
a faster development process or ensure FDA approval. Tebipenem HBr has been granted Fast Track Designation by the FDA for the treatment of cUTI and
AP.

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In January 2021, tebipenem HBr was granted a patent covering a crystalline form and pharmaceutical compositions of tebipenem HBr, with an

expiration of February 2038. We believe that our intellectual property portfolio for tebipenem HBr, which includes multiple patent applications pending,
will provide tebipenem HBr protection globally, including in the United States and Europe, through 2038.

Advantages of tebipenem HBr

Key attributes of tebipenem HBr support our confidence in tebipenem HBr’s commercial potential, if tebipenem HBr receives regulatory approval.

We believe tebipenem HBr has the potential to be a safe and effective treatment for cUTI and other serious and life-threatening infections for which we
may develop tebipenem HBr.

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Potential to be the first oral carbapenem in adults, if approved. Tebipenem HBr is designed to be the first broad-spectrum oral
carbapenem-class antibiotic for use in adults to treat MDR Gram-negative infections. Unlike other carbapenems, which are only available
as IV-administered infusions, tebipenem HBr is an orally administered tablet. Oral administration may potentially allow physicians to
avoid IV-administered antibiotics for otherwise healthy or stable patients and/or allow for a reduction in costs associated with avoiding or
shortening hospitalization.

Potential for differentiated launch characteristics. There are limited branded or generic oral options currently approved or available to
treat fluoroquinolone- and cephalosporin-resistant pathogens to assist with transitioning patients from the hospital to the community
setting, or to prevent unnecessary hospitalization for cUTI. We believe tebipenem HBr, if approved, would be primarily reimbursable
outside the hospital diagnosis-related group, or DRG, system, because of the desire from patients, physicians and payors alike to discharge
patients from the hospital. Together, we believe these factors could differentiate tebipenem HBr from other recently launched antibiotic
drugs, many of which are injectable, reimbursed within the hospital DRG system, and/or substitutable with equally effective generic
alternatives.

Potential uses for treatment. As a result of extensive existing data, we believe that tebipenem HBr has the potential to be used for the
treatment of cUTI and other serious and life-threatening infections caused by resistant Gram-negative pathogens.

Clinical profile observed in the ADAPT-PO clinical trial suggests there are no tradeoffs in treating with oral tebipenem HBr versus IV
ertapenem; safety and tolerability data supported by the Japanese experience. The ADAPT-PO trial achieved its primary objective,
demonstrating that oral tebipenem HBr was statistically non-inferior to intravenous ertapenem in the treatment of patients with cUTI and
patients with AP with respect to the primary endpoint of overall response at the TOC visit in the micro-ITT population. In the ADAPT-PO
trial, the safety and tolerability profile for oral tebipenem HBr was similar to IV ertapenem. Both the type and frequency of adverse events
were well balanced across treatment groups, with treatment-emergent adverse events reported in 26% of treated patients in both arms. The
most commonly observed TEAEs were diarrhea and headaches. Serious adverse events occurred in 1.3% of tebipenem HBr-treated
patients, none of which were considered to be drug-related, and there were no deaths reported in the study.  

A granule formulation of tebipenem has been approved for use in Japan in pediatric patients since 2009, where it has demonstrated a
favorable safety and efficacy profile. Approximately 1,200 subjects were dosed with the active pharmaceutical ingredient of tebipenem
HBr, tebipenem, in clinical and pharmacologic studies during development of this drug by Meiji and its partner in Japan. This data set
includes 741 adults, including 88 patients with cUTIs, the initial indication for which we are developing tebipenem HBr. In each case
tebipenem has demonstrated a favorable safety, pharmacokinetic and tolerability profile. In addition, Meiji has conducted a 3,540 patient
post-marketing study supporting the safety and tolerability profile of tebipenem, specifically demonstrating a safety profile that aligns
well with that observed across the clinical trial program and tolerability in line with other broad spectrum oral antibiotics.

Potential to enable IV-to-oral transition of antibiotic treatment to assist with reduction in hospital stays and/or eliminate the need for
hospitalization. We believe the unique oral formulation of tebipenem HBr may enable patients who begin IV-administered treatment for
extended spectrum beta-lactamases in the hospital setting to transition to oral dosing of tebipenem HBr either in the hospital or upon
discharge for convenient home-based care. We believe that the availability and use of an oral carbapenem as a transition therapy may
eliminate hospitalization or reduce the length of a patient’s hospital stay and the overall cost of care.

7

 
 
 
 
 
 
We believe the foregoing advantages of tebipenem HBr also significantly differentiate tebipenem HBr from fluoroquinolones. Fluoroquinolones are
the most widely used antibiotic class in treating community and hospital Gram-negative infections, but they have encountered increasing resistance among
MDR Gram-negative bacteria and are associated with significant adverse effects. The table below reflects resistance rates in the United States in the
community and hospital settings.

cUTIs in the United States 
Community Setting
Hospital Setting

2019 E. coli Resistance
Rates to Fluoroquinolones 

2013-2014 E. coli Resistance
Rates to Fluoroquinolones 

2000-2004 E. coli Resistance
Rates to Fluoroquinolones 

21.2%  
30.8%  

11.7%  
34.5%  

0%
3.5%

Currently, fluoroquinolones are the most frequently selected antibiotic for empirical urinary tract infection, or UTI, treatment in the community and

hospital settings. Current UTI treatment guidelines published by the Infectious Diseases Society of America identify fluoroquinolones as an appropriate
empirical therapy option. This recommendation, however, is contingent on local resistance rates being less than 10%. The endemicity (high rates) of
fluoroquinolone-resistant E. coli found in the United States today in the community and hospital settings based on the table above would suggest that
fluoroquinolones should not be used empirically for cUTI patients.

The following table highlights the observed in vitro potency differences between tebipenem HBr and levofloxacin, the most widely used
fluoroquinolone. As shown below, tebipenem HBr has a MIC90 value of 0.03 µg/ mL, which compares favorably (i.e., at or below) to the potency value
obtained by levofloxacin. 

Compound 
tebipenem HBr
Levofloxacin

E. coli
MIC90
(µg /mL) 

0.03
>4

In addition, the FDA has issued several warnings against the use of fluoroquinolones in certain patients. In particular, an FDA Advisory Committee

stated in November 2015 that the risk of serious side effects caused by fluoroquinolones generally outweighs the benefits for patients with acute bacterial
sinusitis, acute exacerbation of chronic bronchitis and uncomplicated UTIs, and the agency subsequently issued a drug safety communication to the public
and required safety labeling revisions be made to all products within this drug class. The FDA has determined that fluoroquinolones should be reserved for
use in patients with these conditions who have no alternative treatment options and safety warnings in the labeling of fluoroquinolone class products have
been further strengthened over the past several years. We believe tebipenem HBr could become a potential alternative to oral fluoroquinolones based on its
safety and efficacy profile.

Significant Market Opportunity for Tebipenem HBr

Given the observed activity of tebipenem HBr against different bacteria, we view the market opportunity for tebipenem HBr, if approved, to be

substantial, including for the following uses:

•

•

Community setting: Treating urinary tract infections acquired in the community setting without the need for patient hospitalization.

Hospital setting: Transitioning patients hospitalized for UTIs to an appropriate oral therapy as they are discharged from the hospital.

UTIs are among the most common bacterial diseases worldwide, with significant clinical and economic burden. IQVIA (formerly QuintilesIMS)

estimates that between 33 and 34 million patients either visit their physician or are hospitalized for a UTI or otherwise suspected of experiencing a UTI in
the United States annually. While drugs such as trimethoprim/sulfamethoxazole (Bactrim/Septra) and fluoroquinolones (levofloxacin, ciprofloxacin) have
been the primary oral options for treatment of UTIs caused by Gram-negative organisms, nearly 30% to 35% of UTIs are resistant, which has led to
increased use of IV-administered therapeutics such as carbapenems.

IQVIA completed a market assessment in August 2017 in the community and hospital settings in which it estimated that there were 11 to 12 million

patients annually who presented in the community physician’s office with a UTI and 3.5 to 4.5 million patients annually in the hospital with a UTI in the
United States alone. Of these UTIs, 10 to 11 million are suspected to be caused by Gram-negative bacteria, and 4 to 5 million of these patients had an
infection that is resistant to or failed first-line therapy, such as the fluoroquinolone class, or require IV therapy due to the severity of infection. Physicians in
the survey reported high concern with growing fluoroquinolone resistance and lack of oral options for MDR Gram-negative infections. We believe
tebipenem HBr is well positioned to meet the unmet need for an oral therapy for community-acquired UTI and may offer physicians an option for treating

8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
MDR UTIs while avoiding patient hospitalization. In addition, we believe tebipenem HBr has the potential to accelerate hospital discharge and obviate the
need for continued IV-administered therapy at home by transitioning discharged patients to an at-home oral therapy. Our pivotal Phase 3 clinical trial for
tebipenem HBr, ADAPT-PO, was conducted in a subset of UTIs called cUTIs, and our target focus within this group is the 2.7 million patients receiving
second line or IV treatment in the United States annually. A significant majority of UTIs, including these cUTIs, are caused by a group of MDR Gram-
negative bacteria called Enterobacteriaceae, which tebipenem HBr is effective against.

Tebipenem HBr Clinical Development Program

Single Pivotal Phase 3 Clinical Trial (ADAPT-PO)

In September 2020, we announced positive data from the ADAPT-PO Phase 3 trial evaluating an all oral regimen of tebipenem HBr head-to-head

versus an all IV regimen of ertapenem for the treatment of adults with cUTI, including AP. The global, randomized, placebo-controlled ADAPT-PO Phase
3 clinical trial evaluated the safety and efficacy of tebipenem HBr in hospitalized adult patients with cUTI or AP. Patients were randomized (1:1) to receive
tebipenem HBr (600 mg) orally every 8 hours, or ertapenem (1 g) IV every 24 hours, for a total of 7 to 10 days.

The ADAPT-PO trial achieved its primary objective, demonstrating that oral tebipenem HBr was statistically non-inferior to intravenous ertapenem

in the treatment of patients with cUTI and patients with AP with respect to the primary endpoint of overall response at the TOC visit in the micro-ITT
population. Overall response (combined clinical cure plus microbiological eradication) rates at TOC were 58.8% for oral tebipenem versus 61.6% for IV
ertapenem (treatment difference, -3.3%; 95% confidence interval [CI]: -9.7, 3.2; -12.5% NI margin).

Data presented at IDWeek 2020 expanded on the topline data, and demonstrated that both the clinical cure and microbiological eradication rates

were comparable between treatment groups at the end of treatment, or EOT, TOC and at the late follow-up, or LFU, visits. Specifically, clinical cure rates,
which are the key determinant in routine clinical management of cUTI/AP patients, were >93% in both treatment groups at TOC. The high clinical cure
rates at TOC were sustained through LFU (88.6% and 90% for tebipenem HBr and ertapenem, respectively), demonstrating a durable clinical response in
patients with cUTI and AP. Favorable microbiological response rates at TOC were likewise comparable between treatment groups and were similarly
sustained up to LFU in both treatment groups (57.2% and 58.2% for tebipenem HBr and ertapenem, respectively). There were no statistically significant
differences between treatment groups in overall response rates across key subgroups of interest, including those determined by age, baseline diagnosis, and
presence of bacteremia at baseline. Per pathogen microbiological response rates were generally balanced across treatment groups for the predominant
uropathogens.

Comparative safety and tolerability data from 1,372 hospitalized adult patients enrolled in the study were similar between the tebipenem HBr and

ertapenem treatment groups. Treatment emergent adverse events, or TEAEs, were reported in approximately 26% of patients in both treatment groups and
the most commonly reported TEAEs in both treatment groups were diarrhea (5.0%) and headache (3.8%). Serious TEAEs were infrequent (1.3% for
tebipenem HBr vs. 1.7% for ertapenem) and no deaths were reported in the trial. Three Clostridioides difficile associated TEAEs were observed in the
ertapenem group, while none were observed in the tebipenem HBr group.  

Based on our pre-IND, pre-Phase 3 meeting with the FDA, we believe that positive results from a single pivotal Phase 3 clinical trial of tebipenem

HBr in cUTI would support the approval of tebipenem HBr for the treatment of cUTI. The primary analysis and assessment of non-inferiority was
evaluated using a pre-specified -12.5% non-inferiority (NI) margin.  This NI margin was a modification of the original NI margin of -10% that was
discussed with the FDA because of concern that the COVID-19 pandemic could have an adverse effect on the trial. As a result, the NI margin was modified
prior to database lock from the original NI margin. Data from the ADAPT-PO Phase 3 clinical trial of tebipenem HBr, together with requisite safety data,
drug-drug interaction studies and other studies, will form the basis for the NDA for tebipenem HBr to treat cUTI, including acute pyelonephritis, which we
plan to submit to the FDA in the second half of 2021. The ADAPT-PO clinical trial may also support marketing applications in other global regions.

QIDP Designation

The FDA has designated tebipenem HBr as a QIDP for the treatment of cUTI, CABP and DFI under the GAIN Act. Among other benefits of a

QIDP designation, the first marketing application for the QIDP-designated drug qualifies for priority review by the FDA. The QIDP designation for
tebipenem HBr, however, does not guarantee a faster development process or ensure FDA approval. Further, if tebipenem HBr is approved for the
treatment of cUTI, CABP or DFI, the FDA’s QIDP designation previously granted to tebipenem HBr for those indications will entitle the drug product to
receive a one-time five-year extension to any non-patent exclusivity period awarded to tebipenem HBr in the United States, such as a five-year New
Chemical Entity exclusivity granted under the Hatch-Waxman Act, among other possible periods of regulatory exclusivity that would qualify for a GAIN
exclusivity extension.

9

 
 
Japanese Data Supporting Safety of Tebipenem

Tebipenem pivoxil is a prodrug that is metabolized to tebipenem, its therapeutically active form. We view the clinical safety profile of tebipenem

pivoxil established by Meiji as relevant and supportive of tebipenem HBr because both metabolize to the active metabolite, tebipenem, in plasma. Our
formulation development efforts are designed to improve target concentration while maintaining the exposure per dose.

Tebipenem pivoxil is an orally administered carbapenem, which is a sub-group of the beta-lactam class of antibiotics. The safety of tebipenem

pivoxil was evaluated in approximately 1,200 subjects supporting the application for approval in Japan. In this safety data set, there are 741 adult subjects
across 17 trials and 440 pediatric subjects across six trials. These 23 trials in total included one double-blind, comparator-controlled trial in children, five
open-label trials in children, five trials enrolling adult patients (including two open-label cUTI trials), and 12 Phase 1 clinical pharmacology trials. Among
the pharmacology trials, tebipenem pivoxil was studied for an effect on QT interval, and for the known effect of the pivoxil prodrug on plasma carnitine
concentrations.

In these studies, tebipenem pivoxil was generally well tolerated, with an adverse event, or AE, profile comparable to common, approved oral beta

lactam antibiotics and IV-administered carbapenems. The most common AEs were gastrointestinal (e.g., diarrhea, loose stools) in both children and adults,
and in the Phase 3 clinical trial of otitis media, the incidence was similar to that reported for the comparator, cefditoren pivoxil, an oral cephalosporin
antibiotic. No effect of the administration of tebipenem pivoxil on the prolongation of the QT interval was observed, and the effect on plasma carnitine
concentrations was reversed post treatment and not associated with AEs. A side effect seen with beta-lactam antibiotics is seizures; however, there have
been no reports of inducement of seizures due to the administration of tebipenem pivoxil in clinical trials.

Meiji has reported post-marketing outcomes data reporting the safety and efficacy of Orapenem Fine Granules 10% for Pediatric Use (tebipenem
pivoxil) in pediatric patients with pneumonia, otitis media, or sinusitis. A total of 3,547 cases were enrolled into the observational study, and the analysis
was conducted using 3,540 cases for which it was possible to recover the questionnaires.

A total of 348 instances of adverse drug reactions were observed in 334 cases amongst the 3,337 cases (including 6 adult cases) used in the safety
analyses, and the incidence of adverse drug reactions was 10.01% (334 cases/3,337 cases). The adverse drug reaction that occurred most frequently was
“diarrhea” (9.5%, 318 instances/3,337 cases). One serious drug reaction was observed of “multi-organ failure”. These data are consistent with the safety
profile of tebipenem as established in the pediatric clinical trials and reflected in the Orapenem product labeling in Japan.

A clinical trial evaluating the effect of tebipenem pivoxil dosing over one week on intestinal flora was also performed. Total aerobic and anaerobic
bacterial counts were evaluated. Total bacterial count was reduced by day 7 of the study in both the 100 and 200 mg TID groups. However, no additional
change in bacterial count was observed on subsequent examination days. Neither fecal C. difficile nor its toxin was detected in any of the subjects during or
following completion of the 7-day dosing period.

Funded Label Expansion Opportunity

In addition to cUTI, we believe that tebipenem HBr has the potential to treat other serious and life-threatening infections, including CABP. Our
Biomedical Advanced Research and Development Authority, or BARDA, award provides funding for Phase 1 and Phase 2 trials supporting a potential
CABP indication for tebipenem HBr.

SPR720: Novel Oral Antibiotic Designed for Treatment of Non-tuberculous Mycobacterial Pulmonary (NTM-PD) Disease

A second area of our focus is rare infectious diseases, specifically non-tuberculous mycobacterial pulmonary disease, a rare orphan disease. We are
developing SPR720, which represents a novel class of antibacterial agents that target enzymes essential for bacterial DNA replication, for the treatment of
NTM disease. NTM causes chronic and serious lung disease with debilitating symptoms that leads to a decline in lung function. It can have a significant
physical and emotional impact on patients. SPR720 is designed to be the first novel, oral candidate to treat NTM pulmonary disease. SPR720 represents a
novel class of antibacterial agents that target enzymes essential for bacterial DNA replication.

SPR720 has several key attributes including:

•

•

Acceptable safety and tolerability within therapeutic dose range. Both the SPR720 Phase 1 trial and pharmacokinetic/pharmacodynamic
(PK/PD) data for indicated that predicted therapeutic exposures could be attained with a 500 – 1,000 mg once daily oral dose. These doses
in the Phase 1 trial were associated with a low incidence of adverse events with no serious adverse events reported. The most common
adverse event among all cohorts was mild diarrhea not requiring discontinuation of therapy.

Broad spectrum of activity. SPR720 has demonstrated a broad spectrum of activity in preclinical studies against the most common
organisms causing NTM infections, including Mycobacterium avium complex, or MAC, Mycobacterium kansasii and Mycobacterium
abscessus. SPR720 is applicable to both non-refractory and refractory patients.

10

 
 
 
•

•

•

Convenient for patients. SPR720 has high oral bioavailability. Many patients can find inhalers difficult to use and poor inhalation
technique can negatively impact drug delivery and response to therapy. Oral therapy is simple and more convenient.

Novel mechanism. SPR720 employs a novel mechanism and has no known cross-resistance with marketed antibiotics. Recent studies
have shown the high prevalence of drug resistance in NTM infection species that threatens adequate control of the disease. Novel
mechanisms may help evade existing modes of resistance. 

Lung exposure.  SPR720 is an oral drug that penetrates the pulmonary space. A bronchoalveolar lavage study in non-human primates
supports lung exposure. Furthermore, macrophage data from a 28-day hollow-fiber model of infection demonstrates intracellular and
extracellular activity of the drug.

SPR720 has shown potent activity against most common NTM infection species, such as M. avium, M. abscessus and M. kansasii. As shown in the

exhibit below, SPR720 showed Pulmonary Activity versus M. avium ATCC 700898 in a Murine Chronic Infection Model. In this model SPR720 was
effective as a monotherapy and in combination with SOC agents.

Non-tuberculous mycobacteria are typically found in water and soil. NTM infections cause a rare infection of the lung that is acquired through
inhalation of this microbe. There are approximately 150 types of mycobacteria, with Mycobacterium avium complex, or MAC, the most common cause of
NTM infections, comprising approximately 80% of all NTM infections.

NTM disease occurs in many different types of patients. NTM disease often occurs in people with compromised immune systems, such as those
with HIV, or those with respiratory conditions such as cystic fibrosis, chronic obstructive pulmonary disease, asthma or bronchiectasis. According to Strollo
et al. and Adjemian et al., the diagnosed patient population is approximately 86,000 in the United States. The annual prevalence of NTM disease is
increasing at an estimated rate of 8% per year. While people of any age can be infected by NTM, it mostly affects middle-aged to elderly adults, and is
increasing among patients over 65 years old, a population that is growing in numbers. While relatively rare compared to other infectious diseases, the
prevalence of NTM disease has more than doubled since 1997 and unfortunately, infections caused by NTM are often undiagnosed, masquerading as
another respiratory condition such as COPD or asthma. By comparison, the prevalence of TB in North America has declined.

There are currently no oral FDA-approved therapeutics specifically approved for use to treat NTM pulmonary disease. Given the unmet medical

need, there are regulatory incentives available to encourage drug development to address NTM disease. These include orphan drug designation, potential
for breakthrough therapy status and QIDP designation. Treatment of NTM disease requires prolonged therapy (continuing for approximately 12 to 24
months) with a combination regimen and is frequently complicated by tolerability and/or toxicity issues. Treatment failure is common and is often due to
poor compliance or inability to tolerate the regimen. Many patients experience progressive lung disease and mortality is high. We believe there is a need for
new, potent, orally available therapies for NTM disease. While there are competitive compounds in development for NTM disease, these therapies are not
effective in all patients and are not orally available.

We believe that our intellectual property portfolio for SPR720, which includes multiple issued patents and patent applications pending, will provide

SPR720 protection globally, including in the United States and Europe, through 2033.

11

 
 
 
 
 
 
 
 
 
 
 
Our SPR720 Development Plan

Our strategy is to develop SPR720 to become the first oral treatment FDA-indicated for NTM disease, and ultimately provide a treatment option to

NTM patients to reduce their disease burden and improve their quality of life.

In March 2020, the FDA granted orphan drug designation for SPR720, a designation that is given to drugs intended to treat a rare disease or

condition that affects fewer than 200,000 persons in the United States. An orphan drug designation can provide specific benefits including up to seven
years of market exclusivity in the United States upon regulatory approval.  In February 2019, we received QIDP designation for SPR720 for the treatment
of lung infections caused by nontuberculous mycobacteria and for the treatment of lung infections caused by Mycobacterium tuberculosis. QIDP
designation entitles a future marketing application for SPR720 for this indication to priority review by the FDA. Neither the QIDP nor orphan drug
designation, however, guarantee a faster development process or ensure FDA approval. In September 2020, SPR720 was awarded Fast Track Designation
by the FDA for treatment of adult patients with NTM pulmonary disease.

In December 2020, we initiated a Phase 2a dose-ranging clinical trial of SPR720 in patients with nontuberculous mycobacterial pulmonary disease

following the acceptance of our investigational new drug, or IND, application for SPR720 in August 2020. The Phase 2a clinical trial is designed as a
multi-center, partially blinded, placebo-controlled proof-of-concept clinical trial of SPR720 that is expected to enroll approximately 90 treatment-
inexperienced patients with NTM-PD due to MAC.  Patients are randomized to receive either 500 mg or 1,000 mg of oral SPR720 once daily, placebo, or
standard- of-care, or SOC, consisting of a macrolide and ethambutol, plus the option of adding a rifamycin.  The objectives of the trial are to evaluate the
plasma pharmacokinetics, safety, tolerability, and microbiological response of SPR720 compared with placebo and SOC over 28 days of treatment, with the
inclusion of the SOC arm to assess and ensure assay sensitivity for the trial design.

The doses selected for the Phase 2a trial of SPR720 are supported by pharmacokinetic analyses as well as data from the Phase 1 clinical trial of

SPR720.  The Phase 1 trial reported in December 2019 was designed as a double-blind, placebo-controlled, ascending dose, multi-cohort study in healthy
subjects. Data from this Phase 1 trial was presented at ID Week 2020 and indicated that SPR720 is generally well-tolerated, and predicted therapeutic
exposures could be attained with a 500 – 1,000 mg once daily oral dose.

The Phase 1 clinical trial of SPR720 evaluated the safety, tolerability and PK of orally administered SPR720 at single doses ranging from 100 mg to

2000 mg and repeat total daily doses ranging from 500 mg to 1500 mg for up to 7 to 14 days. Across seven single ascending dose, or SAD, and five
multiple ascending dose, or MAD, cohorts, a total of 96 healthy volunteers (including a cohort of healthy elderly (age ≥ 65 years) volunteers) were
randomized to receive SPR720 or placebo. There were no serious adverse events reported and all participants completed the trial. An analysis of
preliminary blinded data indicates that SPR720 was generally well-tolerated at doses up to 1000 mg over the maximum studied duration of 14 days.
Preliminary analyses of PK data across the cohorts show no significant impact of either advanced age or administration with food on PK variables. At
doses of 500 mg or higher, the mean plasma drug exposures of SPR719, the active metabolite of SPR720, are consistent with those suggested by in vivo
models of SPR720 to be necessary for clinical efficacy against target NTM pathogens.

Update on Phase 2a Clinical Trial

On February 5, 2021, we announced that the FDA informed us that a clinical hold had been placed on our Phase 2a clinical trial of SPR720,
following our notification to the FDA of our decision to pause dosing in our ongoing Phase 2a clinical trial of SPR720 as a precautionary measure related
to events in our ongoing animal toxicology study of SPR720. The decision to implement the pause was made based on a recommendation from the
Company’s Safety Review Board, or SRB, following review of data from an ongoing toxicology study of SPR720 in adult non-human primates in which
mortalities with inconclusive causality to treatment were observed.

The animal study is being conducted to assess the potential toxicity of SPR720. A concurrent study of SPR720 in rats is proceeding uneventfully.
These studies are meant to support longer-term treatment with SPR720 beyond the 28 days currently supported by IND-enabling toxicology studies. No
serious adverse events have been observed in any human study participants.

Subsequent to receiving verbal notification from the FDA of the clinical hold, we received a formal clinical hold letter in which the FDA has
requested additional information from the non-human primate trial, including a study report. We have decided to discontinue the Phase 2a clinical trial at
this time to best facilitate future potential adjustments to the protocol based on FDA feedback and to avoid incurring costs associated with the trial while on
clinical hold. We are continuing to work with the FDA to evaluate the findings and determine the further development pathway for the SPR720 clinical
program.

12

 
 
 
 
 
 
 
 
 
 
IV Potentiator Product Candidate SPR206: Our IV-administered product candidate being developed as an innovative option to treat multi-drug
resistant (MDR) Gram-negative bacterial infections in the Hospital Setting.

SPR206 is an IV-administered product candidate being developed as an innovative option to treat MDR Gram-negative bacterial infections in the

Hospital Setting. Gram-negative bacteria represent a subset of bacterial organisms distinguished by the presence of an outer cell membrane. SPR206 is
designed to treat MDR Gram-negative bacterial infections through interactions with the bacteria’s outer cell membrane as a monotherapy.

SPR206 is a direct acting IV-administered agent that has demonstrated single-agent antibacterial activity in preclinical studies against Gram-
negative bacteria, including organisms identified by the CDC and the WHO as urgent and serious threats to human health, including Acinetobacter
baumannii and Pseudomonas aeruginosa.

In January 2020 we reported results from a Phase 1 clinical trial designed as a double-blind, placebo-controlled, ascending dose, multi-cohort study

in healthy subjects. In the Phase 1 clinical trial SPR206 was well-tolerated at doses that are likely to be within a therapeutic range for target MDR Gram-
negative bacterial infections and has a safety profile that we believe supports the further development of SPR206. The Phase 1 clinical trial of SPR206 was
designed as a double-blind, placebo-controlled, ascending dose, multi-cohort study in healthy subjects. In this SAD and MAD Phase 1 clinical trial, a total
of 96 healthy volunteers were randomized to receive SPR206 or placebo. All reported adverse events were mild to moderate and there were no reported
severe or serious adverse events. No evidence of nephrotoxicity was observed and there were no subjects with clinically significant changes in laboratory
tests during the study. SPR206 was well-tolerated at doses up to 100 mg administered three-times a day, a total of 300 mg daily, for 14 consecutive days.
Pharmacokinetic data across the cohorts indicate dose linearity and dose proportionality as well as mean plasma drug exposures of SPR206 that are
concordant with preclinical models predictive for clinical efficacy against target Gram-negative pathogens.

We have conducted a preclinical toxicology study of SPR206 in accordance with good laboratory practice, or GLP, requirements as well as

conducted nonclinical studies in which SPR206 demonstrated activity as a single agent against MDR and extensively drug resistant, or XDR, bacterial
strains, including isolates of Pseudomonas aeruginosa, Acinetobacter baumannii and carbapenem-resistant Enterobacteriaceae, in both in vitro and in vivo
models of infection. We expect to initiate a Phase 1 bronchoalveolar lavage, or BAL, clinical trial to assess the penetration of SPR206 into the pulmonary
compartment in the first half of 2021 and to initiate a renal impairment study of SPR206 in 2021.

SPR206 has been granted QIDP designation by the FDA for the treatment of cUTI and hospital-acquired bacterial pneumonia and ventilator-
associated bacterial pneumonia (HABP/VABP). We have multiple patent applications pending for SPR206 that we believe will provide SPR206 protection
globally, including in the United States and Europe, through 2039.

Following an evaluation of the IV Potentiator product candidates, we discontinued development of SPR741, effective January 1, 2020. We believe

that the collective data from the recent Phase 1 and preclinical studies of SPR206 suggest a potency and safety profile that may be superior to SPR741.
Further, we believe SPR206 may have a potentially faster path to pivotal clinical trials when compared with SPR741 because SPR206 is being developed
as a single agent. As a result of this decision, we terminated our license agreement with Northern Antibiotics Oy (Ltd.) relating to SPR741. Effective
January 1, 2020, the intellectual property rights associated with SPR741 reverted to Northern Antibiotics and we no longer have any rights with respect
thereto and we no longer have any obligations for the cost of maintaining such intellectual property.

SPR206 Advantages

We believe that with the following key attributes, SPR206, an IV Potentiator, has the potential to become a safe and effective treatment for serious

Gram-negative infections:

•

Potential to Expand the Potency of Standard-of-Care Antibiotics. SPR206 is designed to expand the potency of SOC antibiotics by
restoring and expanding their Gram-negative activity. We believe that this novel mechanism could provide a new option for patients with
resistant Gram-negative infections, thereby improving therapeutic outcomes, decreasing physicians’ reliance on older poorly tolerated and
ineffective drugs.

13

 
 
 
 
 
 
 
•

SPR206 appears to be a safe and potent IV-administered direct-acting agent. SPR206 is designed to interact with LPS to disrupt the
outer membrane. SPR206 is also designed to have direct antibiotic activity, while retaining Potentiator activity, including activity against
Pseudomonas aeruginosa and Acinetobacter baumannii. Data from SPR206 in vitro and in vivo GLP safety pharmacology and absorption,
distribution, metabolism, and excretion, or ADME, studies and 14-day, two-species GLP toxicology studies provide support for an
acceptable safety profile, which led to SPR206’s designation as a clinical candidate and the initiation of a Phase 1 clinical trial in
December 2018. Phase 1 data demonstrates that SPR206 is well-tolerated at doses that are likely to be within a therapeutic range for target
MDR Gram-negative bacterial infections and has a safety profile that we believe supports the further development of SPR206. We are
developing SPR206 as a treatment for high-risk patients with suspected or known Gram-negative infections such as carbapenem-resistant
Enterobacteriaceae, or CRE, carbapenem resistant Acinetobacter baumannii, or CRAB, and MDR Pseudomonas aeruginosa, or MDR
PA, to prevent mortality and reduce the length of stay in the hospital setting.

SPR206—Development Plan

Advancing SPR206 into Two Phase 1 Clinical Trials in 2021

We plan to advance SPR206 into a Phase 1 BAL clinical trial to assess the penetration of SPR206 into the pulmonary compartment in the first half

of 2021 and to initiate a renal impairment study of SPR206 in 2021.

Its advancement is supported by the Phase 1 SAD and MAD that we reported data for in January 2020. The Phase 1 trial was designed as a double-
blind, placebo-controlled, ascending dose, multi-cohort study in healthy subjects. In the Phase 1 clinical trial, SPR206 was well-tolerated at doses that are
likely to be within a therapeutic range for target MDR Gram-negative bacterial infections and had a safety profile that we believe supports the further
development of SPR206. The Phase 1 clinical trial of SPR206 was designed as a double-blind, placebo-controlled, ascending dose, multi-cohort study in
healthy subjects. In this SAD and MAD Phase 1 clinical trial, a total of 96 healthy volunteers were randomized to receive SPR206 or placebo. All reported
adverse events were mild to moderate and there were no reported severe or serious adverse events. No evidence of nephrotoxicity was observed and there
were no subjects with clinically significant changes in laboratory tests during the study. SPR206 was well-tolerated at doses up to 100 mg administered
three-times a day, a total of 300 mg daily, for 14 consecutive days. Pharmacokinetic data across the cohorts indicate dose linearity and dose proportionality
as well as mean plasma drug exposures of SPR206 that are concordant with preclinical models predictive for clinical efficacy against target Gram-negative
pathogens.

In Vitro Activity of SPR206 against MDR Gram-Negative Bacteria

Results from multiple susceptibility studies against contemporary clinical isolates suggest that SPR206 possesses potent activity against MDR

Enterobacteriaceae, carbapenem resistant Pseudomonas aeruginosa and carbapenem resistant Acinetobacter baumannii.

14

 
 
 
 
 
 
 
 
 
Our Strategy

Our goal is to identify, develop and commercialize novel treatments for MDR bacterial infections, focusing on areas of high unmet medical need for

safe and effective antibiotic treatments. Key elements of our strategy are as follows:

•

•

•

•

•

Advance our lead product candidate tebipenem HBr to regulatory approval. In September 2020, Spero announced positive data from the
ADAPT-PO Phase 3 trial evaluating an all oral regimen of tebipenem HBr head-to-head versus an all IV regimen of ertapenem for the
treatment of adults with cUTI, including AP. The ADAPT-PO trial achieved its primary objective, demonstrating that oral tebipenem HBr
was statistically non-inferior to intravenous ertapenem in the treatment of patients with cUTI and patients with AP with respect to the
primary endpoint of overall response at the TOC visit in the micro-ITT population. Overall response (combined clinical cure plus
microbiological eradication) rates at TOC were 58.8% for oral tebipenem versus 61.6% for IV ertapenem (treatment difference, -3.3%;
95% confidence interval [CI]: -9.7, 3.2; -12.5% NI margin).  Comparative safety and tolerability data from 1,372 hospitalized adult
patients enrolled in the study were similar between the tebipenem HBr and ertapenem treatment groups. We intend to make an NDA
submission to the FDA for tebipenem HBr in the second half of 2021. In addition to cUTI, we believe that tebipenem HBr has the
potential to treat other serious and life-threatening infections, including CABP. In December 2020, we initiated a Phase 1 bronchoalveolar
lavage, or BAL, clinical trial to assess the penetration of tebipenem HBr into the pulmonary compartment and we expect to report data
from the trial in second half of 2021. In addition, our tebipenem HBr collaboration with BARDA, which is further described elsewhere in
this “Business” section of our Annual Report on Form 10-K, provides funding for a clinical trial in pneumonia patients.

Establish global commercialization and marketing capabilities. We have global commercialization rights to all of our product
candidates, with the exception of tebipenem HBr and SPR206 in certain contractually specified Asian countries. Additionally, the Bill &
Melinda Gates Medical Research Institute, or Gates MRI, holds rights to develop SPR720 for the treatment of lung infections caused by
Mycobacterium tuberculosis in certain countries. Our management team has significant expertise in the commercialization of infectious
disease treatments. Prior to joining us, members of our management team have collectively played leading roles in the approval and
launch of 11 infectious disease products. We intend to build a targeted sales force and directly commercialize our product candidates in
the United States in both hospital and community settings. Outside the United States, we intend to enter into collaborations with third
parties to develop and market our product candidates in targeted geographical markets. By collaborating with companies that have an
existing commercial presence and experience in such markets, we believe we can efficiently maximize the commercial potential of our
product candidates.

Diversify into rare orphan infectious disease markets such as NTM disease. We believe there is a significant opportunity to develop
products for underserved “orphan” infectious disease areas, such as NTM disease. These markets offer the attributes of fewer branded or
generic competitors as well as chronic therapy. We believe our drug candidate SPR720 has the potential to be the first oral antibiotic
approved for the treatment of nontuberculous mycobacterial pulmonary disease. We may seek to acquire other product candidates for
other underserved, debilitating orphan infectious diseases. We will evaluate our ability to continue to advance SPR720 through clinical
development. In December 2020, we initiated a Phase 2a clinical trial of SPR720 in treatment inexperienced patients with NTM
pulmonary disease due to MAC. On February 5, 2021, we announced that the FDA informed us that a clinical hold had been placed on
our Phase 2a clinical trial of SPR720, which is further described elsewhere in this “Business” section of our Annual Report on Form 10-K
under the heading “Update on Phase 2a Clinical Trial.” In December 2019, we reported Phase 1 data for SPR720 showing that SPR720
was generally well-tolerated, with a pharmacokinetic profile that we believe supports further development of the compound as an oral
agent for the treatment of NTM disease. In June 2019, SPR720 was the focus of an equity investment by the Novo REPAIR Impact Fund
for $10 million as well as a collaboration with Bill & Melinda Gates Medical Research Institute, or Gates MRI, to further the development
of SPR720 for TB. In March 2020, the FDA granted orphan drug designation for SPR720 for the treatment of NTM infection, a
designation available to drugs intended to treat a rare disease or condition that affects fewer than 200,000 persons in the United States. An
orphan drug designation can provide specific benefits such as seven years of market exclusivity in the United States upon regulatory
approval. In September 2020, SPR720 was awarded Fast Track Designation by the FDA for treatment of adult patients with NTM
pulmonary disease.

Maximize the value of our pipeline through collaborations with other pharmaceutical companies. We may elect to pursue strategic
collaborations with other pharmaceutical companies to leverage our pipeline. We believe it may be beneficial to develop and
commercialize one or more of our product candidates through partnering opportunities. Such collaborations may include regional
collaborations to advance our pipeline products, or product-specific deals pairing our product candidates with collaborators’ antibiotics,
whether generic or novel, with the intention of enhancing those antibiotics’ performance and efficacy.

Continue to pursue collaborations with non-commercial organizations for scientific expertise and funding support. We have received
funding support from BARDA, the United States National Institute of Allergy and Infectious Diseases, or NIAID, the United States
Department of Defense, or DoD, and the Combating Antibiotic Resistant Bacteria Biopharmaceutical Accelerator, or CARB-X, a public-
private partnership funded by BARDA within the United States Department of Health and Human Services. We intend to continue to
collaborate with government agencies and non-profit foundations to support the development of our product candidates.

15

 
 
 
 
 
 
•

Expand our portfolio of product candidates for the treatment of MDR infections. Since our inception, we have focused on identifying
and developing antibiotics to treat MDR infections, and we are using our expertise to aggressively build and expand a portfolio of product
candidates for the treatment of such infections where unmet need exists and no viable generic alternatives are available. Our management
team has deep-rooted relationships in the academic, medical and corporate infectious disease community, which provide us visibility into
new and innovative therapies under development. Our focus in assessing product candidates relies on three principles: 1) broad spectrum
of activity, 2) convenient for patients and 3) novel mechanism to overcome resistance. We believe the greatest unmet medical needs for
safe and effective antibiotic treatments lie among infections due to MDR bacteria, as patients with these infections often have limited or
inadequate therapeutic options, leading to high rates of mortality. The increasing prevalence of drug resistance and MDR bacteria, and the
limitations of existing therapies and traditional drug development approaches, highlight the critical need for novel therapies capable of
overcoming resistance, particularly orally administrable agents.

Collaboration, License and Service Agreements

In addition to our own patents and patent applications, we have acquired or licensed patents, patent applications and know-how from various third

parties to access intellectual property covering product candidates that we are developing. We have certain obligations under these acquisitions or licensing
agreements, including diligence obligations and payments, which are contingent upon achieving various development, regulatory and commercial
milestones. Also, pursuant to the terms of some of these license agreements, when and if commercial sales of a product commence, we may be obligated to
pay royalties to such third parties on net sales of the respective products. Some of our license agreements include sublicenses of rights owned by third-party
head licensors. In addition, we have entered into a license agreement (described below) pursuant to which we have granted certain development,
manufacturing and commercialization rights with respect to our Potentiator product candidates.

Meiji Agreements

To support our development of tebipenem HBr, in June 2017 we entered into an exclusive License Agreement with Meiji Seika Pharma Co., Ltd., or

the Meiji License. Pursuant to the Meiji License, we obtained know-how, data and regulatory documents that will support the development of tebipenem
HBr.

We retain exclusive rights to commercialize tebipenem HBr throughout the world, except in Japan, Bangladesh, Brunei, Cambodia, China,

Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, South Korea, Taiwan, Thailand and Vietnam, where Meiji will have exclusive rights to
commercialize tebipenem HBr. With Meiji, we have established a joint development committee for the management of the development of tebipenem HBr,
including any joint, cross-territory studies that may be undertaken by the parties, if any. In addition, the parties will establish a joint commercialization
committee to coordinate information sharing relative to commercialization of the new formulation.

Meiji and we have granted each other exclusive cross licenses to our respective tebipenem intellectual property, including know-how and regulatory

documentation. The license granted to us by Meiji includes certain know-how that Meiji received from Global Pharma, as described below. As such, our
rights to the Global Pharma know-how component are non-exclusive.

Under the Meiji License, we have paid Meiji a one-time nonrefundable upfront fee of $0.6 million and are obligated to pay Meiji future clinical and

regulatory milestone payments up to an aggregate of $2.0 million and royalties of a low single-digit percentage based on net sales of tebipenem HBr. In
October 2017, we paid a $1.0 million milestone payment to Meiji upon the enrollment of the first patient in our Phase 1 clinical trial of tebipenem HBr.
Additionally, we are obligated to pay Meiji a percentage of certain amounts received from any sublicensees, up to an aggregate of $7.5 million.

Some of the know-how that we received under the Meiji License to support tebipenem HBr development was originally obtained by Meiji through a

license from Global Pharma, which we refer to as the head license. Prior to entering into the Meiji License with us, Meiji received written approval from
Global Pharma permitting Meiji to enter into the Meiji License with us. Specifically, in a letter agreement between Global Pharma and Meiji entered into in
January 2017, Global Pharma consented to Meiji assisting us with the transfer or license of the Global Pharma know-how and Meiji know-how on a non-
exclusive basis outside of those Asian countries identified above, as well as certain related matters. This letter agreement does not contemplate us having
any right to sublicense the Global Pharma know-how. Global Pharma retains rights to its know-how outside of those Asian countries identified above.

The Meiji License continues in effect until the expiration of all payment obligations thereunder (including royalty payments and licensee revenue)

on a product-by-product and country-by-country basis, unless earlier terminated by the parties. Pursuant to the terms of the Meiji License, in addition to
each party’s right to terminate the agreement upon the other party’s material breach (if not cured within a specified period after receipt of notice) or
insolvency, we also have unilateral termination rights (i) in the event that we abandon the development and commercialization of tebipenem HBr for
efficacy, safety, legal or business factors, and (ii) under certain circumstances arising out of the head license with Global Pharma.

16

 
 
 
 
IV Potentiator Product Agreements

Northern License Agreement

In January 2020, we terminated our license agreement with Northern Antibiotics Oy (Ltd.) relating to SPR741. Effective January 1, 2020, the

intellectual property rights associated with SPR741 have entirely reverted to Northern Antibiotics and we no longer have any rights with respect thereto
and we no longer have any obligations for the cost of maintaining such intellectual property.

Cantab Agreements

In June 2016, we entered into a stock purchase agreement, or the Cantab Agreement, with Pro Bono Bio PLC, a corporation organized under the

laws of England, and its affiliates, including PBB Distributions Limited, or PBB, Cantab Anti-Infectives Ltd., or CAI and New Pharma License Holdings
Limited, or NPLH, in order to acquire NPLH and its intellectual property rights and assets relating to our Potentiator products, and our next-generation
potentiating agents in particular. The intellectual property portfolio we acquired includes patents which cover SPR206 as well as other novel potentiating
agents, polymyxin derivatives and other LPS or outer-membrane bacterial disrupting agents. In exchange for the acquisition of NPLH, we paid PBB
upfront consideration in the amount of $0.3 million and also agreed to make milestone payments of up to $5.8 million upon the achievement of specified
clinical and regulatory milestones and a payment of £5.0 million ($6.8 million as of December 31, 2020) upon the achievement of a specified commercial
milestone. We also agreed to pay royalties of a low single-digit percentage based on net sales of products licensed under the agreement. In addition, Spero
Cantab issued an equity interest in Spero Cantab and entered into a subscription agreement and shareholders agreement with PBB. In July 2017, we
repurchased PBB’s minority equity interest in Spero Cantab in exchange for a one-time nonrefundable upfront fee of approximately $0.2 million and we
also amended the Cantab Agreement to increase the contingent milestone payments to PBB by an aggregate of $0.1 million. The Cantab Agreement
continues indefinitely, with royalty payment obligations thereunder continuing on a product-by-product and country-by-country basis until the later of ten
years after the first commercial sale of such product in such country or the expiration in such country of the last to expire valid claim of any of the
applicable patents.

In addition, we hold a NIAID contract that partially funded the next-generation potentiating agent development program. That contract was novated
from CAI to us in December 2017. Under the contract we were obligated to pay PBB a percentage of funds received from NIAID up to a maximum of $1.3
million, which was fulfilled as of December 31, 2020.

Everest Medicines License Agreement

On January 4, 2019, we, through NPLH, entered into a license agreement, or the Original Everest License Agreement, with Everest, which Original

Everest License Agreement also included an option granted by our wholly owned subsidiary, Spero Potentiator, Inc., a Delaware corporation, or
Potentiator. Under the terms of the Original Everest License Agreement, we granted Everest an exclusive license to develop, manufacture and
commercialize SPR206 or products that contain SPR206, or Licensed Products, in Greater China (which includes Mainland China, Hong Kong and
Macau), South Korea and certain Southeast Asian countries, collectively referred to as the Territory. We retained development, manufacturing and
commercialization rights with respect to SPR206 and Licensed Products in the rest of the world and also retained the right to develop or manufacture
SPR206 and Licensed Products in the Territory for use outside the Territory. In addition to the license grant to SPR206, we granted Everest a 12-
month exclusive option to negotiate with us for an exclusive license to develop, manufacture and commercialize SPR741 in the Territory. For the reasons
discussed above, following an evaluation of the Potentiator product candidates, we discontinued the development of SPR741, effective January 1, 2020,
and decided to move forward with SPR206 as our lead Potentiator product candidate. In addition, on October 29, 2019, Everest notified us that it did not
intend to exercise its option with respect to SPR741 under the Original Everest License Agreement. Accordingly, effective January 1, 2020, we no longer
have any intellectual property rights with respect to SPR741 and we no longer have any obligations for the cost of maintaining such intellectual property.

Under the terms of the Original Everest License Agreement, we received an upfront payment of $3.0 million. We also received a milestone payment

of $2.0 million in the fourth quarter of 2020 upon completion and delivery of the results of a clinical study.

17

 
 
 
 
 
 
In January 2021, we entered into an amended and restated license agreement, or the Amended Everest License Agreement, with Everest and
Potentiator, which amended and restated in its entirety the Original Everest License Agreement. The Amended Everest License Agreement modified the
dates and values of certain milestone events related to development and commercialization of SPR206. Everest will now be making more significant
investments in the development of SPR206 beyond what was contemplated at the time of the Original Everest License Agreement. The Original Everest
License Agreement provided that we could receive up to $59.5 million upon achievement of certain milestones. The Amended Everest License Agreement
provides that we may receive up to $38.0 million upon achievement of certain milestones, of which $2.0 million has been received to date. In addition,
under the Amended Everest License Agreement, the Company assigned patents in the Territory to Everest, rather than licensing such patents to Everest,
and the option related to SPR741 and related provisions have been removed. We are also entitled to receive high single-digit to low double-digit royalties
on net sales, if any, of Licensed Products in the Territory following regulatory approval of SPR206. Everest has the right to sublicense to affiliates and third
parties in the Territory.

Everest is responsible for all costs related to developing, obtaining regulatory approval of and commercializing SPR206 and Licensed Products in
the Territory, and is obligated to use commercially reasonable efforts to develop, manufacture and commercialize Licensed Products, including to achieve
certain specified diligence milestones within agreed-upon periods. A joint development committee will be established between us and Everest to coordinate
and review the development, manufacturing and commercialization plans with respect to Licensed Products in the Territory.

Unless earlier terminated due to certain material breaches of the contract, or otherwise, the Amended Everest License Agreement will expire on

a jurisdiction-by-jurisdiction and Licensed Product-by-Licensed Product basis until the latest to occur of expiration of the last valid claim under a licensed
patent in such jurisdiction, the expiration of regulatory exclusivity in such jurisdiction or ten years after the first commercial sale of such Licensed Product
in such jurisdiction. The Amended Everest License Agreement may be terminated in its entirety by Everest upon 90 or 180 days’ prior written notice,
depending on the stage of development of the initial Licensed Product.

Other License, Collaboration and Service Agreements

Gates MRI Collaboration

In June 2019, we entered into a collaboration with Gates MRI, a nonprofit research institution wholly owned by the Bill and Melinda Gates

Foundation, to develop SPR720 for the treatment of lung infections caused by Mycobacterium tuberculosis, or Mtb. In furtherance of the Gates MRI’s
charitable purposes, we also granted the Gates MRI a no cost, exclusive license to develop, manufacture and commercialize SPR720 for the treatment of
TB in low- and middle- income countries. Gates MRI will conduct and fund preclinical and clinical studies for the development of SPR720 against TB as
well as certain collaborative research activities performed by us.

Vertex Assignment and License Agreement

In May 2016, we entered into an agreement with Vertex Pharmaceuticals Incorporated, or Vertex, pursuant to which Vertex assigned to us rights to
patents relating to SPR720 and SPR719 (an active metabolite). The acquired patent portfolio includes protection for composition of matter, method of use,
and specific key intermediates used in the manufacture of SPR719 and SPR720. We also obtained certain know-how and a license to research, develop,
manufacture and sell products for a proprietary compound, as well as a transfer of materials as part of the transaction. In return, we granted Vertex an
exclusive license to the assigned patents and know-how for use outside of the diagnosis, treatment or prevention of bacterial infections. In exchange for the
assigned patents, we paid Vertex an upfront, one-time, non-refundable, non-creditable fee of $0.5 million, which was recognized as research and
development expense, and we also agreed to pay Vertex future clinical, regulatory and commercial milestones up to $81.3 million in the aggregate and a
royalty on the net sales of licensed products ranging from mid-single digits to low double digits. During the year ended December 31, 2020, we paid and
recorded $0.9 million in expense related to the achievement of regulatory milestones for SPR720. The agreement continues in effect until the expiration of
all payment obligations thereunder, with royalty payment obligations continuing on a product-by-product and country-by-country basis until the later of ten
years after the first commercial sale of such product in such country or the date of expiration in such country of the last to expire applicable patent. Further,
Vertex has the right to terminate the agreement if provided with notification from us of our intent to cease all development or if no material development or
commercialization efforts occur for a period of 12 consecutive months.

18

 
 
 
 
 
Savior Service Agreement

In November 2018, we entered into a service agreement with Savior Lifetec Corporation, or Savior, to perform technology transfer, process
development, analytical method development and testing and formulation development for tebipenem HBr. Per the terms of the agreement, we paid Savior
a non-refundable supervision fee of approximately $2.0 million to manage the buildout of a commercial manufacturing facility. The supervision fee is
classified as a prepaid asset on our balance sheet and is being amortized over a service period of approximately 34 months. We have paid Savior an
additional $5.1 million for facility build out costs, which is classified as a long-term asset on our balance sheet as of December 31, 2020.

Government Awards

Through December 31, 2020, we have committed funding support of up to an aggregate of $49.7 million in non-dilutive funding from BARDA,

NIAID, the DoD and concluded awards from CARB-X, SBIR and the DoD, with the potential to receive a total of up to $63.0 million (inclusive of
amounts we have already received) if certain options are exercised. The awards are subject to termination for convenience at any time by the granting
government agency, and the granting government agency is not obligated to provide funding to us beyond the base period amounts from Congressionally
approved annual appropriations. These awards are structured in the following manner:

•

•

•

•

BARDA award to support the further clinical development of tebipenem HBr. The BARDA award provides total reimbursement to us of
up to $46.8 million for qualified expenses for tebipenem HBr development over a five-year period. The award initially committed funding
of $15.7 million over a three-year base period from July 2018 to June 30, 2021 for cUTI development activities. In May 2019, the contract
was modified to include additional funding of approximately $2.5 million for tebipenem HBr, increasing the amount of initial committed
funding from $15.7 million to approximately $18.2 million. In January 2020, BARDA exercised its first option under the contract,
committing $15.9 million for tebipenem HBr through November 2021. Total committed funding under the BARDA award to date is $34.1
million, including the first option exercised in 2020. There is a second option exercisable by BARDA for the remaining $12.7 million of
funding, subject to specified milestones being achieved under the award agreement. As part of our tebipenem HBr collaboration with
BARDA described above, there will be studies assessing the efficacy of tebipenem HBr in treatment of infections caused by biodefense
threats such as anthrax, plague, and melioidosis, including a clinical trial in pneumonia patients. The Defense Threat Reduction Agency,
or DTRA, will provide up to $10.0 million in addition to the total potential $46.8 million from BARDA, to cover the cost of the
nonclinical biodefense aspects of the collaboration program. While such funding would be for the purpose of developing tebipenem HBr
in these areas, we will not receive any funds directly from DTRA. Upon these achievements, BARDA may exercise its second option to
fund a clinical trial in pneumonia patients to demonstrate safety and data suggestive of efficacy.

NIAID funding for SPR206. The NIAID contract for SPR206 provides for total development funding of up to $6.5 million over a base
period and three option periods. To date, funding for the base period and the first two option periods, totaling $5.9 million, have been
committed through March 2021.

NIAID award under its Small Business Innovation Research program, or SBIR, for SPR720. This award provided up to $1.0 million of
support for our SPR720 program. The scope of the program included in vitro and in vivo assessments of SPR720 against TB as well as
nonclinical and manufacturing activities in support of both TB and NTM indications. The NIAID SBIR award was structured as a base
period followed by a single option. For the base period of March 1, 2017 through February 28, 2018, NIAID committed funding of
approximately $0.6 million for the SPR720 program. In February 2018 NIAID exercised the approximately $0.4 million option, with a
period of performance from March 1, 2018 through February 28, 2019. In January 2019, the period of performance for this award was
extended through February 28, 2020. This award has been closed out as of December 31, 2020.

DoD funding for SPR206. In July 2019 we were awarded a $5.9 million award from the DoD Congressionally Directed Medical Research
Programs, or CDMRP, Joint Warfighter Medical Research Program, which will support, over a four-year period into July 2023, the
development of SPR206. The funding will cover the costs of select Phase 1 pharmacology studies, a 28-day GLP non-human primate
toxicology study, and microbiological surveillance studies that would be required for a potential NDA submission with the FDA for
SPR206. This award was preceded by a DoD cooperative agreement award made to Spero in September 2016 that funded our potentiator
product candidates to develop anti-infective agents to combat Gram-negative bacteria. It was structured as a single, two-year $1.5 million
award with a period of performance through September 2019. That award has now been closed out.

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Intellectual Property

We strive to protect the proprietary technology that we believe is important to our business, including seeking and maintaining patents intended to
cover our product candidates and compositions, their methods of use and processes for their manufacture and any other inventions that are commercially
important to the development of our business. We also rely on trade secrets to protect aspects of our business that are not amenable to, or that we do not
consider appropriate for, patent protection.

Our success will significantly depend on our ability to obtain and maintain patent and other proprietary protection for commercially important
technology and inventions and know-how related to our business, defend and enforce our patents, preserve the confidentiality of our trade secrets and
operate without infringing the valid and enforceable patents and proprietary rights of third parties. We also rely on know-how and continuing technological
innovation to develop and maintain our proprietary position.

Spero-Owned Intellectual Property Relating to Tebipenem HBr and Other Compounds Under Development

We have patent applications directed to the composition of matter, formulation and/or use of tebipenem HBr, SPR206 and SPR720 pending in the

United States, Europe, Japan and other countries.

Tebipenem HBr Oral Carbapenem (Tebipenem Pivoxil Hydrobromide)

Our tebipenem HBr program contains two pending United States provisional patent applications, one issued and two pending United States patent
applications, and four issued and 37 pending foreign patent applications covering novel preparations of tebipenem pivoxil hydrobromide as of December
31, 2020, all wholly owned by us. The provisional patent application must be converted to PCT applications within one year of their May 2020 and
November 2020 filing dates. The issued foreign patents are issued in Australia (2), Brazil, and South Africa. Foreign patent applications are pending in
Australia, Brazil, Canada, China, Colombia, the Eurasian Patent Office, the European Patent Office, Egypt, Indonesia, Israel, India, Japan, South Korea,
Mexico, New Zealand, the Philippines, Singapore, Thailand, Vietnam, and South Africa. United States and foreign patents covering our tebipenem pivoxil
hydrobromide preparations will have statutory expiration dates of December 2037, February 2038, May 2040, and November 2040. Patent term
adjustments or patent term extensions could result in later expiration dates.

In January 2021, the United States Patent and Trademark Office, or USPTO, issued U.S. Patent No, 10,889,587, which is directed to the crystalline

formulation of tebipenem HBr, Spero’s oral carbapenem in development for the treatment of cUTI and AP. This patent covers a crystalline form of
tebipenem pivoxil HBr, pharmaceutical compositions of tebipenem pivoxil HBr and methods of use. The patent expires in February 2038.

Next-Generation Potentiator Product (SPR206)

The intellectual property portfolio for our next-generation polymyxin program contains patent applications and issued patents directed to

composition of matter for polymyxin-like compounds with different structural features, pharmaceutical compositions comprising the same, and methods of
use for these novel compounds and compositions. As of December 31, 2020, we owned one United States patent and three pending United States patent
applications, ten foreign patents, and 46 pending foreign patent applications in a number of jurisdictions including Argentina, Australia, Brazil, Canada,
China, Colombia, the Eurasian Patent Office, the European Patent Office, Hong Kong, India, Israel, Japan, South Korea, Malaysia, Mexico, New Zealand,
the Philippines, Russia,  Singapore, South Africa, Taiwan, Thailand, Ukraine, Venezuela and Vietnam. Issued United States or foreign patents and any
patents issuing from pending United States or foreign applications covering our next-generation polymyxin program will have a statutory expiration date of
May 2034, March 2035, November 2035, or June 2039. Patent term adjustments or patent term extensions could result in later expiration dates.

In 2019 Spero entered into an agreement with Everest, by which Everest would develop, manufacture, and commercialize SPR206 in China, South

Korea, and certain Southeast Asian countries. Spero’s agreement with Everest has since been amended to include an obligation by Spero to assign its
SPR206 patent rights to Everest in these countries.

NTM Disease Program (SPR720)

Our intellectual property portfolio for our DNA Gyrase Inhibitor program includes issued patents and pending patent applications directed to
composition of matter for SPR720, and its close analogs and prodrugs, novel solid forms of SPR720 and its prodrugs, methods of manufacture, and
methods of treatment using SPR720 alone and in combination with other antibiotic compounds. All patents and patent applications in the portfolio are
wholly owned by us. As of December 31, 2020, we owned 11 issued United States patents, 91 issued foreign patents, and seven pending foreign patent
applications. The issued and foreign patents are in a number of jurisdictions including the European Union and its member states, Argentina, Australia,
Brazil, Canada, China, Hong Kong, Indonesia, Israel, India, Japan, South Korea, Mexico, New Zealand, the Philippines, Russia, Singapore, South Africa,
and Taiwan. Issued United States and foreign patents, and patents issuing from pending United States and foreign applications, will have statutory
expiration dates of January 2032, June 2032 and July 2033. Patent term adjustments or patent term extensions could result in later expiration dates.

20

 
Patent Term and Patent Term Extensions

The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries, including the
United States, the patent term is 20 years from the earliest filing date of a non-provisional patent application. In the United States, a patent’s term may be
lengthened by patent term adjustment, which compensates a patentee for administrative delays by the USPTO in examining and granting a patent, or may
be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug, biological product or medical device
approved pursuant to a pre-market approval may also be eligible for patent term extension when FDA approval is granted, provided statutory and
regulatory requirements are met. The length of the patent term extension is related to the length of time the drug is under regulatory review while the patent
is in force. The Hatch-Waxman Act permits a patent term extension of up to five years beyond the expiration date set for the patent. Patent extension cannot
extend the remaining term of a patent beyond a total of 14 years from the date of product approval, only one patent applicable to each regulatory review
period may be granted an extension and only those claims reading on the approved drug are extended. Similar provisions are available in Europe and other
foreign jurisdictions to extend the term of a patent that covers an approved drug.

Trade Secrets

We rely, in some circumstances, on trade secrets to protect our unpatented technology. However, trade secrets can be difficult to protect. We seek to

protect our trade secrets and proprietary technology and processes, in part, by confidentiality agreements with our employees, consultants, scientific
advisors and contractors. We also seek to preserve the integrity and confidentiality of our data and trade secrets by maintaining physical security of our
premises and physical and electronic security of our information technology systems. While we have confidence in these individuals, organizations and
systems, agreements or security measures may be breached. We may not have adequate remedies for any breach and could lose our trade secrets through
such a breach. In addition, our trade secrets may otherwise become known or be independently discovered by competitors. To the extent that our
consultants, contractors or collaborators use intellectual property owned by others in their work for us, disputes may arise as to the rights in related or
resulting trade secrets, know-how and inventions.

Competition

The biopharmaceutical industry is characterized by intense competition and rapid innovation. Our potential competitors include large

pharmaceutical and biotechnology companies, specialty pharmaceutical companies and generic drug companies. Many of our potential competitors have
greater financial, technical, and human resources than we do, as well as greater experience in the discovery and development of product candidates,
obtaining FDA and other regulatory approvals of products and the commercialization of those products. Accordingly, our potential competitors may be
more successful than us in obtaining FDA approval of drugs and achieving widespread market acceptance. We anticipate that we will face intense and
increasing competition as new drugs enter the market and advanced technologies become available. Finally, the development of new treatment methods for
the diseases we are targeting could render our product candidates non-competitive or obsolete.

We believe the key competitive factors that will affect the development and commercial success of our most advanced product candidate, tebipenem
HBr, if approved, will be efficacy, coverage of drug-resistant strains of bacteria, safety and tolerability profile, reliability, convenience of oral dosing, price,
availability of reimbursement from governmental and other third-party payers and susceptibility to drug resistance.

We are developing tebipenem HBr as an oral antibiotic for use as a monotherapy for the treatment of resistant and MDR infections. If approved,

tebipenem HBr would compete with several antibiotics currently in clinical development for urinary tract infection, including sulopenem from Iterum
Therapeutics Limited, ARX-1796 from Pfizer, Gepotidacin from GSK and Pivmecillinam from Utilility Therapeutics. We also expect that tebipenem HBr,
if approved, would compete with future and current generic versions of marketed antibiotics. If approved, we believe that tebipenem HBr would compete
effectively against these compounds on the basis of tebipenem HBr’s potential:

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broad range of activity against a wide variety of resistant and MDR Gram-negative bacteria;

low probability of drug resistance;

a favorable safety and tolerability profile supported by years of post-marketing experience in Japan;

a convenient oral dosing regimen and opportunity to step-down from IV-administered therapy; and

as a monotherapy treatment for MDR Gram-negative infections.

We are also developing SPR206 as an innovative IV-administered agent for Gram-negative infections in the hospital. If approved, SPR206 would
compete with several IV-administered products marketed for the treatment of Gram-negative infections, including ceftazidime-avibactam (Avycaz) from
Allergan plc and Pfizer Inc., ceftolozane-tazobactam (Zerbaxa) from Merck & Co., plazomicin (Zemdri) from Cipla Therapeutics, Inc., eravacycline
(Xerava) from Tetraphase Pharmaceuticals, Inc., and meropenem-vaborbactam (Vabomere) from Melinta Therapeutics, Inc. There are also a number of IV-
administered product candidates in late-stage clinical development that are intended to treat resistant Gram-negative infections, including cefiderocol from
Shionogi & Co. Ltd., and imipenem-relebactam from Merck & Co. Each of these products and product candidates employs a mechanism of action that
differs from the mechanism of action employed by SPR206.

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We are developing SPR720 to be the first approved oral treatment for NTM disease. There are currently no oral agents approved to treat NTM

disease. Only one drug is approved to treat NTM infection that would potentially compete with SPR720 called Arikayce from Insmed, an inhaled version
of a commonly used drug in the hospital setting called amikacin. It should be noted that combination therapy is recommended for treating this condition.

Government Regulation and Product Approval

Government authorities in the United States, at the federal, state and local level, and in other countries, extensively regulate, among other things, the

research, development, clinical trials, testing, manufacture, including any manufacturing changes, authorization, pharmacovigilance, adverse event
reporting, recalls, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, import and export of pharmaceutical
products and product candidates such as those we are developing. The processes for obtaining regulatory approvals in the United States and in foreign
countries, along with subsequent compliance with applicable statutes and regulations, require the expenditure of substantial time and financial resources.

United States Government Regulation

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and implementing regulations. The
process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations requires
the expenditure of substantial time and financial resources. Failure to comply with the applicable United States requirements at any time during the product
development process, approval process or after approval, may subject an applicant to a variety of administrative or judicial sanctions, such as the FDA’s
refusal to approve pending NDAs, withdrawal of an approval, imposition of a clinical hold, issuance of warning letters, product recalls, product seizures,
total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement or civil and/or
criminal penalties.

The process required by the FDA before a drug may be marketed in the United States generally involves the following:

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completion of preclinical laboratory tests, animal studies and formulation studies in compliance with GLPs and other applicable
regulations;

submission to the FDA of an IND which must become effective before human clinical trials may begin;

approval by an independent institutional review board, or IRB, at each clinical site before each trial may be initiated;

performance of adequate and well-controlled human clinical trials in accordance with GCPs to establish the safety and efficacy of the
proposed drug product for each indication;

submission to the FDA of an NDA and payment of user fees;

satisfactory completion of an FDA advisory committee review, if applicable;

satisfactory completion of an FDA pre-approval inspection of the manufacturing facility or facilities at which the product is produced to
assess compliance with current good manufacturing practices, or cGMPs, and to assure that the facilities, methods and controls are
adequate to preserve the drug’s identity, strength, quality and purity;

satisfactory completion of audits of clinical trial sites conducted by FDA to assure compliance with GCPs and the integrity of clinical
data; and

FDA review and approval of the NDA.

Preclinical Studies

Preclinical studies include laboratory evaluation of product chemistry, toxicity and formulation, as well as animal studies to assess potential safety
and efficacy. Preclinical tests intended for submission to the FDA to support the safety of a product candidate must be conducted in compliance with GLP
regulations and the United States Department of Agriculture’s Animal Welfare Act. A drug sponsor must submit the results of the preclinical tests, together
with manufacturing information, analytical data and any available clinical data or literature, among other things, to the FDA as part of an IND. Some
nonclinical testing may continue even after the IND is submitted. An IND automatically becomes effective 30 days after receipt by the FDA, unless before
that time the FDA raises concerns or questions related to one or more proposed clinical trials and places the clinical trial on a clinical hold. In such a case,
the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. As a result, submission of an IND may not result in
the FDA allowing clinical trials to commence. A clinical hold may occur at any time during the life of an IND and may affect one or more specific studies
or all studies conducted under the IND.

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Clinical Trials

Clinical trials involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in

accordance with GCP requirements, which include the requirement that all research subjects provide their informed consent in writing for their
participation in any clinical trial along with the requirement to ensure that the data and results reported from the clinical trials are credible and accurate.
Clinical trials are conducted under protocols detailing, among other things, the objectives of the trial, the criteria for determining subject eligibility, the
dosing plan, the parameters to be used in monitoring safety, the procedure for timely reporting of adverse events, and the effectiveness criteria to be
evaluated. A protocol for each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND. In addition, an IRB
at each institution participating in the clinical trial must review and approve the plan for any clinical trial before it commences at that institution.

Information about certain clinical trials and clinical trial results must be submitted within specific timeframes to the National Institutes of Health, or

NIH, for public dissemination on its www.clinicaltrials.gov website.

Human clinical trials are typically conducted in three sequential phases, which may overlap or be combined:

Phase 1: The drug is initially introduced into healthy human subjects or patients with the target disease or condition and tested for safety, dosage
tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an early indication of its effectiveness. During Phase 1 clinical trials,
sufficient information about the investigational drug’s pharmacokinetics and pharmacological effects may be obtained to permit the design of well-
controlled and scientifically valid Phase 2 clinical trials.

Phase 2: The drug is administered to a larger, but still limited patient population to identify possible adverse effects and safety risks, to preliminarily

evaluate the efficacy of the product for specific targeted indications and to determine dosage tolerance and optimal dosage. Phase 2 clinical trials are
typically well-controlled and closely monitored.

Phase 3: The drug is administered to an expanded patient population, generally at geographically dispersed clinical trial sites, in well-controlled

clinical trials to generate enough data to statistically evaluate the efficacy and safety of the product for approval, to establish the overall risk-benefit profile
of the product, and to provide adequate information for the labeling of the product. Phase 3 clinical trials usually involve a larger number of participants
than a Phase 2 clinical trial.

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and more frequently if serious adverse

events occur. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, or at all. Results from one trial
may not be predictive of results from subsequent trials. Furthermore, the FDA or the sponsor may suspend or terminate a clinical trial at any time on
various grounds, including a finding that the research subjects are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate
approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been
associated with unexpected serious harm to patients.

Marketing Approval

Assuming successful completion of the required clinical testing, the results of the nonclinical studies and clinical trials, together with detailed

information relating to the product’s chemistry, manufacture, controls and proposed labeling, among other things, are submitted to the FDA as part of an
NDA requesting approval to market the product for one or more indications. Under the Prescription Drug User Fee Act, or PDUFA, as amended, each NDA
must be accompanied by a significant user fee. The FDA adjusts the PDUFA user fees on an annual basis. PDUFA also imposes an annual program fee for
prescription drug products. Fee waivers or reductions are available in certain circumstances, such as where a waiver is necessary to protect the public
health, where the fee would present a significant barrier to innovation, or where the applicant is a small business submitting its first human therapeutic
application for review.

Under the performance goals and policies agreed to by the FDA under PDUFA, the FDA has a goal of ten months from the date of “filing” of a

standard NDA for a new molecular entity to review and act on the submission, and six months from the filing date for an application with priority review.
This review typically takes 12 months from the date the NDA is submitted to FDA (eight months for priority applications) because the FDA has
approximately two months to make a “filing” decision. Furthermore, the FDA is not required to complete its review within the established ten-month
timeframe (or six months for priority applications) and may extend the review process by issuing requests for additional information or clarification.

The FDA conducts a preliminary review of all NDAs within the first 60 days after submission, before accepting them for filing, to determine
whether they are sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an NDA for filing. In
this event, the application must be resubmitted with the additional information. The resubmitted application is also subject to review before the FDA
accepts it for filing. Once the submission is accepted for filing, the FDA begins an in-depth substantive review. The FDA reviews an NDA to determine,
among other things, whether the drug is safe and effective and whether the facilities in which it is manufactured, processed, packaged or held meet
standards designed to assure the product’s continued safety, quality and purity.

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In addition, under the Pediatric Research Equity Act of 2003, as amended and reauthorized, certain NDAs or supplements to an NDA must contain
data that are adequate to assess the safety and effectiveness of the drug for the claimed indications in all relevant pediatric subpopulations, and to support
dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA may, on its own initiative or at the request
of the applicant, grant deferrals for submission of some or all pediatric data until after approval of the product for use in adults or full or partial waivers
from the pediatric data requirements.

Unless otherwise required by regulation, the pediatric data requirements do not apply to products with orphan designation.

During the review and approval process, the FDA likely will re-analyze the clinical trial data, which could result in extensive discussions between

the FDA and the applicant during the review process. The FDA also may require submission of a risk evaluation and mitigation strategy, or REMS, plan if
it determines that a REMS is necessary to ensure that the benefits of the drug outweigh its risks and to assure the safe use of the drug. The REMS plan
could include medication guides, physician communication plans, assessment plans, and elements to assure safe use, such as restricted distribution
methods, patient registries, or other risk minimization tools.

The FDA may refer an application for a novel drug or a drug that presents difficult questions of safety or efficacy to an advisory committee. An

advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a
recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an
advisory committee, but it considers such recommendations carefully when making decisions.

Before approving an NDA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not approve an

application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure
consistent production of the product within required specifications. Additionally, before approving an NDA, the FDA will typically inspect one or more
clinical trial sites to assure that the clinical trials were conducted in compliance with IND regulations and GCP requirements and to assure the integrity of
the clinical data submitted to the FDA.

The FDA generally accepts data from foreign clinical trials in support of an NDA if the trials were conducted under an IND. If a foreign clinical trial

is not conducted under an IND, the FDA nevertheless may accept the data in support of an NDA if the study was conducted in accordance with GCPs and
the FDA is able to validate the data through an on-site inspection, if deemed necessary. Although the FDA generally requests that marketing applications be
supported by some data from domestic clinical trials, the FDA may accept foreign data as the sole basis for marketing approval if (1) the foreign data are
applicable to the United States population and United States medical practice, (2) the studies were performed by clinical investigators with recognized
competence, and (3) the data may be considered valid without the need for an on-site inspection or, if the FDA considers the inspection to be necessary, the
FDA is able to validate the data through an on-site inspection or other appropriate means.

The testing and approval process for a new drug product requires substantial time, effort and financial resources, and each may take several years to

complete. Data obtained from preclinical and clinical testing are not always conclusive and may be susceptible to varying interpretations, which could
delay, limit or prevent regulatory approval. The FDA may not grant approval on a timely basis, or at all.

After evaluating the NDA and all related information, including the advisory committee recommendation, if any, and inspection reports regarding
the manufacturing facilities and clinical trial sites, the FDA may issue an approval letter, or, in some cases, a complete response letter. An approval letter
authorizes commercial marketing of the drug with specific prescribing information for specific indications. A complete response letter, or CRL, describes
all of the specific deficiencies in the NDA identified by the agency. A CRL indicates that the review cycle of the application is complete and the application
will not be approved in its present form. The deficiencies identified may be minor, for example, requiring labeling changes, or major, for example,
requiring additional clinical trials. Additionally, the CRL may include recommended actions that the applicant might take to place the application in a
condition for approval. If a complete response letter is issued, the applicant may either resubmit the NDA, addressing all of the deficiencies identified in the
letter, or withdraw the application. If and when those deficiencies have been addressed to the FDA’s satisfaction in a resubmission of the NDA, the FDA
will issue an approval letter to the applicant. The FDA has committed to reviewing such resubmissions in response to an issued CRL in either two or six
months depending on the type of information included.  Even with submission of this additional information, however, the FDA ultimately may decide that
the application does not satisfy the regulatory criteria for approval.

Even if the FDA approves a product, it may limit the approved indications for use of the product, require that contraindications, warnings or
precautions be included in the product labeling, require that post-approval studies, including Phase 4 clinical trials, be conducted to further assess a drug’s
safety after approval, require testing and surveillance programs to monitor the product after commercialization, or impose other conditions, including
distribution and use restrictions or other risk management mechanisms under a REMS plan, which can materially affect the potential market and
profitability of the product. The FDA may prevent or limit further marketing of a product based on the results of post-marketing studies or surveillance
programs. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes, and additional labeling
claims, are subject to further testing requirements and FDA review and approval.

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Special FDA Expedited Review

The FDA is authorized to designate certain products for expedited development or review if they are intended to address an unmet medical need in
the treatment of a serious or life-threatening disease or condition. These programs include fast track designation, breakthrough therapy designation, QIDP
designation, and priority review designation. The purpose of these programs is to provide important new drugs to patients earlier than under standard FDA
review procedures.

To be eligible for a fast track designation, the FDA must determine, based on the request of a sponsor, that a product is intended to treat a serious or

life threatening disease or condition and demonstrates the potential to address an unmet medical need, or if the drug qualifies as a QIDP under the GAIN
Act. The FDA will determine that a product will fill an unmet medical need if it will provide a therapy where none exists or provide a therapy that may be
potentially superior to existing therapy based on efficacy or safety factors. Fast track designation provides additional opportunities for interaction with the
FDA’s review team and may allow for rolling review of NDA components before the completed application is submitted, if the sponsor provides a schedule
for the submission of the sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the
sponsor pays any required user fees upon submission of the first section of the NDA. In addition, fast track designation may be withdrawn by the sponsor
or rescinded by the FDA if the designation is no longer supported by data emerging in the clinical trial process. Tebipenem HBr has been granted fast track
designation by the FDA for the treatment of cUTI and AP, and in September 2020, SPR720 received fast track designation for treatment of adult patients
with NTM pulmonary disease.

In addition, with the enactment of the FDA Safety and Innovation Act, or FDASIA, in 2012, Congress created a new regulatory program for
therapeutic candidates designated by FDA as “breakthrough therapies” upon a request made by the IND sponsors. A breakthrough therapy is defined as a
drug that is intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, and preliminary
clinical evidence indicates that the drug may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints,
such as substantial treatment effects observed early in clinical development. The FDA must take certain actions with respect to breakthrough therapies,
such as holding timely meetings with and providing advice to the product sponsor, intended to expedite the development and review of an application for
approval of a breakthrough therapy.

FDASIA also included the Generating Antibiotics Incentives Now Act, or the GAIN Act, which directed the FDA to implement the qualified
infectious disease product, or QIDP, designation program. The GAIN Act created incentives for the development of antibacterial and antifungal drug
products for the treatment of serious or life-threatening infections. A therapeutic candidate designated as a QIDP is eligible for fast track designation, and
the first marketing application submitted for a specific drug product and indication for which QIDP designation was granted will be granted priority review.
A subsequent application from the same sponsor for the same product and indication will receive priority review designation only if it otherwise meets the
criteria for priority review. As discussed further below under “Qualified Infectious Disease Product Exclusivity,” the GAIN Act also provides the
possibility of a five-year exclusivity extension that is added to any other marketing exclusivity for which a QIDP-designated drug qualifies upon FDA
approval.  

Finally, the FDA may designate a product for priority review if it is a drug or biologic that treats a serious condition and, if approved, would provide

a significant improvement in safety or effectiveness. The FDA determines at the time that the marketing application is submitted, on a case-by-case basis,
whether the proposed drug represents a significant improvement in treatment, prevention or diagnosis of disease when compared with other available
therapies. Significant improvement may be illustrated by evidence of increased effectiveness in the treatment of a condition, elimination or substantial
reduction of a treatment-limiting drug reaction, documented enhancement of patient compliance that may lead to improvement in serious outcomes, or
evidence of safety and effectiveness in a new subpopulation. A priority review designation is intended to direct overall attention and resources to the
evaluation of such applications, and to shorten the FDA’s goal for taking action on a marketing application from ten months to six months for an NDA for a
new molecular entity from the date of filing.

Even if a product qualifies for one or more of these programs, the FDA may later decide that the product no longer meets the conditions for
qualification or decide that the time period for FDA review or approval will not be shortened. Furthermore, fast track designation, breakthrough therapy
designation and priority review do not change the standards for approval and may not ultimately expedite the development or approval process.

Accelerated Approval Pathway

In addition, a product studied for its safety and effectiveness in treating serious or life-threatening illnesses and that provide meaningful therapeutic
benefit over existing treatments may receive accelerated approval, meaning that it may be approved on (i) the basis of adequate and well-controlled clinical
trials establishing that the drug product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or (ii) on an intermediate
clinical endpoint that can be measured earlier than irreversible morbidity or mortality, or IMM, and that is reasonably likely to predict an effect on IMM or
other clinical benefit, taking into account the severity, rarity or prevalence of the condition and the availability or lack of alternative treatments. As a
condition of approval, the FDA may require a sponsor of a drug receiving accelerated approval to perform post-marketing studies to verify and describe the
predicted effect on IMM or other clinical endpoint, and the drug may be subject to expedited withdrawal procedures. Drugs granted accelerated approval
must meet the same statutory standards for safety and effectiveness as those granted traditional approval.

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The accelerated approval pathway is usually contingent on a sponsor’s agreement to conduct, in a diligent manner, additional post-approval
confirmatory studies to verify and describe the drug’s clinical benefit. As a result, a therapeutic candidate approved on this basis is subject to rigorous post-
marketing compliance requirements, including the completion of Phase 4 or post-approval clinical trials to confirm the effect on the clinical endpoint.
Failure to conduct required post-approval studies, or to confirm the predicted clinical benefit of the product during post-marketing studies, would allow the
FDA to withdraw approval of the drug. All promotional materials for drug products being considered and approved under the accelerated approval program
are subject to prior review by the FDA.

Limited Population Antibacterial Drug Pathway

On December 13, 2016, former President Obama signed into law the Cures Act, which is intended to accelerate medical product development.

Section 3042 of the Cures Act established the limited population pathway for certain antibacterial or antifungal drugs intended to treat targeted groups of
patients suffering from serious or life-threatening infections where unmet need exists. Approvals of these limited population drugs are expected to rely on
data from smaller clinical trials than would ordinarily be required by the FDA. For drugs approved through this pathway, the statement “Limited
Population” will appear prominently next to the drug’s name in labeling, which is intended to provide notice to healthcare providers that the drug is
indicated for use in a limited and specific population of patients. To date, the FDA has approved two products under this pathway, and in August 2020 it
published a final guidance for industry entitled “Limited Population Pathway for Antibacterial and Antifungal Drugs” that describes the criteria, processes,
and other general considerations for demonstrating the safety and effectiveness of limited population antibacterial and antifungal drugs, or LPADs, and is
intended to assist sponsors in their development of certain new products for approval under the LPAD pathway.

Post-Approval Requirements

Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among
other things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of
adverse experiences with the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims, are
subject to prior FDA review and approval. Certain modifications to the product, including changes in indications or manufacturing processes or facilities,
may require the applicant to develop additional data or conduct additional preclinical studies and clinical trials to support the submission to FDA. There
also are continuing, annual user fee requirements for any marketed products, as well as new application fees for supplemental applications with clinical
data.

The FDA may impose a number of post-approval requirements as a condition of approval of an NDA. For example, the FDA may require post-

marketing testing, including Phase 4 clinical trials, and surveillance to further assess and monitor the product’s safety and effectiveness after
commercialization.

In addition, FDA regulations require that products be manufactured in specific approved facilities and in accordance with cGMPs. The cGMP

regulations include requirements relating to organization of personnel, buildings and facilities, equipment, control of components and drug product
containers and closures, production and process controls, packaging and labeling controls, holding and distribution, laboratory controls, records and reports
and returned or salvaged products. Drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to
register their establishments with the FDA and some state agencies, and are subject to periodic unannounced inspections by the FDA for compliance with
cGMP requirements and other laws. Changes to the manufacturing process are strictly regulated and, depending on the significance of the change, may
require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose
reporting and documentation requirements upon the sponsor and any third-party manufacturers. Accordingly, manufacturers must continue to expend time,
money, and effort in the area of production and quality control to maintain compliance with cGMP and other aspects of quality control and quality
assurance.

The FDA strictly regulates the marketing, labeling, advertising and promotion of drug products that are placed on the market. A product cannot be

commercially promoted before it is approved, and approved drugs may generally be promoted only for their approved indications and for use in patient
populations described in the product’s approved labeling. Promotional claims must also be consistent with the product’s FDA-approved label, including
claims related to safety and effectiveness. The government also closely scrutinizes the promotion of prescription drugs in specific contexts such as direct-
to-consumer advertising, industry-sponsored scientific and educational activities, and promotional activities involving the Internet and social media.
Although physicians may prescribe legally available products for off-label uses, manufacturers may not market or promote such uses. After an approval is
granted, the FDA may withdraw the approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the
product reaches the market.

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Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with
manufacturing processes, or failure to comply with regulatory requirements, may result in mandatory revisions to the approved labeling to add new safety
information; imposition of post-market studies or clinical trials to assess new safety risks; or imposition of distribution or other restrictions under a REMS
program. Other potential consequences of regulatory non-compliance include, among other things:

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restrictions on, or suspensions of, the marketing or manufacturing of the product, complete withdrawal of the product from the market or
product recalls;

interruption of production processes, including the shutdown of manufacturing facilities or production lines or the imposition of new
manufacturing requirements;

fines, warning letters or other enforcement letters or clinical holds on post-approval clinical trials;

mandated modification of promotional materials and labeling and the issuance of corrective information;

refusal of the FDA to approve pending NDAs or supplements to approved NDAs, or suspension or revocation of product approvals;

product seizure or detention, or refusal to permit the import or export of products;  

injunctions or the imposition of civil or criminal penalties; or

consent decrees, corporate integrity agreements, debarment, or exclusion from federal health care programs.

In addition, the distribution of prescription pharmaceutical products is subject to the Prescription Drug Marketing Act, or PDMA, which regulates
the distribution of drugs and drug samples at the federal level, and sets minimum standards for the registration and regulation of drug distributors by the
states. Both the PDMA and state laws limit the distribution of prescription pharmaceutical product samples and impose requirements to ensure
accountability in distribution. Most recently, the Drug Supply Chain Security Act, or the DSCSA, was enacted with the aim of building an electronic
system to identify and trace certain prescription drugs distributed in the United States. The DSCSA mandates phased-in and resource-intensive obligations
for pharmaceutical manufacturers, wholesale distributors, and dispensers over a 10‑year period that is expected to culminate in November 2023.

Regulatory Exclusivity and Approval of Follow-on Products

Hatch-Waxman Exclusivity

In 1984, with passage of the Hatch-Waxman Amendments to the FDCA, Congress enacted Section 505(b)(2) of the FDCA and also established an

abbreviated regulatory scheme authorizing the FDA to approve generic drugs that are shown to contain the same active ingredients as, and to be
bioequivalent to, drugs previously approved by the FDA pursuant to NDAs. To obtain approval of a generic drug, an applicant must submit an abbreviated
new drug application, or ANDA, to the agency. An ANDA is a comprehensive submission that contains, among other things, data and information
pertaining to the active pharmaceutical ingredient, bioequivalence, drug product formulation, specifications and stability of the generic drug, as well as
analytical methods, manufacturing process validation data and quality control procedures. ANDAs are “abbreviated” because they cannot include
preclinical and clinical data to demonstrate safety and effectiveness. Instead, in support of such applications, a generic manufacturer must rely on the
preclinical and clinical testing previously conducted for a drug product previously approved under an NDA, known as the reference-listed drug, or RLD.

Specifically, in order for an ANDA to be approved, the FDA must find that the generic version is identical to the RLD with respect to the active
ingredients, the route of administration, the dosage form, the strength of the drug and the conditions of use of the drug. At the same time, the FDA must
also determine that the generic drug is “bioequivalent” to the innovator drug. Under the statute, a generic drug is bioequivalent to a RLD if “the rate and
extent of absorption of the drug do not show a significant difference from the rate and extent of absorption of the listed drug.”

Upon approval of an ANDA, the FDA indicates whether the generic product is “therapeutically equivalent” to the RLD in its publication “Approved

Drug Products with Therapeutic Equivalence Evaluations,” also referred to as the “Orange Book.” Physicians and pharmacists consider a therapeutic
equivalent generic drug to be fully substitutable for the RLD. In addition, by operation of certain state laws and numerous health insurance programs, the
FDA’s designation of therapeutic equivalence often results in substitution of the generic drug without the knowledge or consent of either the prescribing
physician or patient.

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In contrast, Section 505(b)(2) permits the filing of an NDA where at least some of the information required for approval comes from studies not

conducted by or for the applicant and for which the applicant has not obtained a right of reference. A Section 505(b)(2) applicant may eliminate the need to
conduct certain preclinical or clinical studies if it can establish that reliance on studies conducted for a previously-approved product is scientifically
appropriate. Unlike the ANDA pathway used by developers of bioequivalent versions of innovator drugs, which does not allow applicants to submit new
clinical data other than bioavailability or bioequivalence data, the 505(b)(2) regulatory pathway does not preclude the possibility that a follow-on applicant
would need to conduct additional clinical trials or nonclinical studies; for example, it may be seeking approval to market a previously approved drug for
new indications or for a new patient population that would require new clinical data to demonstrate safety or effectiveness.

As part of the NDA review and approval process, applicants are required to list with the FDA each patent that has claims that cover the applicant’s

product or method of therapeutic use. Upon approval of a new drug, each of the patents listed in the application for the drug is then published in the Orange
Book. Drugs listed in the Orange Book can, in turn, be cited by potential follow-on competitors in support of approval of an ANDA or 505(b)(2) NDA.

When an ANDA applicant submits its application to the FDA, it is required to certify to the FDA concerning any patents listed for the reference

product in the FDA’s Orange Book. Specifically, the applicant must certify that: (i) the required patent information has not been filed; (ii) the listed patent
has expired; (iii) the listed patent has not expired, but will expire on a particular date and approval is sought after patent expiration; or (iv) the listed patent
is invalid or will not be infringed by the new product. Moreover, to the extent that the Section 505(b)(2) NDA applicant is relying on studies conducted for
an already approved product, the applicant also is required to certify to the FDA concerning any patents listed for the NDA-approved product in the Orange
Book to the same extent that an ANDA applicant would. 

If the follow-on applicant does not challenge the innovator’s listed patents, the FDA will not approve the ANDA or 505(b)(2) application until all

the listed patents claiming the referenced product have expired. A certification that the new product will not infringe the already approved product’s listed
patents, or that such patents are invalid, is called a Paragraph IV certification. If the follow-on applicant has provided a Paragraph IV certification to the
FDA, the applicant must also send notice of the Paragraph IV certification to the NDA and patent holders once the ANDA has been accepted for filing by
the FDA. The NDA and patent holders may then initiate a patent infringement lawsuit in response to the notice of the Paragraph IV certification. The filing
of a patent infringement lawsuit within 45 days of the receipt of a Paragraph IV certification automatically prevents the FDA from approving the ANDA or
505(b)(2) NDA until the earlier of 30 months, expiration of the patent, settlement of the lawsuit, or a decision in the infringement case that is favorable to
the ANDA/505(b)(2) applicant.

An ANDA or 505(b)(2) application also will not be approved until any applicable non-patent exclusivities listed in the Orange Book for the

referenced product have expired. The Hatch-Waxman Amendments to the FDCA provided a five-year period of non-patent data exclusivity within the
United States to the first applicant to gain approval of an NDA for a new chemical entity, or NCE. For the purposes of this provision, an NCE is a drug that
contains no active moiety that has previously been approved by the FDA in any other NDA. An active moiety is the molecule or ion responsible for the
physiological or pharmacological action of the drug substance. In cases where such NCE exclusivity has been granted, an ANDA or 505(b)(2) NDA may
not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph IV certification, in which case the
applicant may submit its application four years following the original product approval.

The FDCA also provides for a period of three years of data exclusivity if an NDA or NDA supplement includes reports of one or more new clinical

investigations, other than bioavailability or bioequivalence studies, that were conducted or sponsored by the applicant are deemed by the FDA to be
essential to the approval of the application. This three-year exclusivity period often protects changes to a previously approved drug product, such as new
indications, dosage forms, route of administration or combination of ingredients. Three-year exclusivity would be available for a drug product that contains
a previously approved active moiety, provided the statutory requirement for a new clinical investigation is satisfied. Unlike five-year NCE exclusivity, an
award of three-year exclusivity does not block the FDA from accepting ANDAs or 505(b)(2) NDAs seeking approval for generic versions of the drug as of
the date of approval of the original drug product; rather, this three-year exclusivity covers only the conditions of use associated with the new clinical
investigations and, as a general matter, does not prohibit the FDA from approving follow-on applications for drugs containing the original active ingredient.

Five-year and three-year exclusivity also will not delay the submission or approval of a traditional NDA filed under Section 505(b)(1) of the FDCA;
however, an applicant submitting a traditional NDA would be required to conduct or obtain a right of reference to all of the preclinical studies and adequate
and well-controlled clinical trials necessary to demonstrate safety and effectiveness. For drug products that contain an “antibiotic” ingredient approved
prior to 1997, the statute imposes certain limitations on the award of non-patent exclusivity. However, we do not believe these limitations would apply to
tebipenem HBr or any of our other investigational antibiotics currently in preclinical and clinical development.

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Qualified Infectious Disease Product Exclusivity

Under the GAIN Act, the FDA may designate a product as a QIDP. In order to qualify for designation as a QIDP, the drug product candidate must be

an antibiotic or antifungal drug for human use intended to treat serious or life-threatening infections, including those caused by either (i) an antibiotic or
antifungal resistant pathogen, including novel or emerging infectious pathogens, or (ii) a so-called “qualifying pathogen” found on a list of potentially
dangerous, drug-resistant organisms to be established and maintained by the FDA. We obtained a QIDP designation for the oral formulation of tebipenem
HBr for cUTI in November 2016 and CABP and DFI in April 2017. We were granted QIDP designation by the FDA for SPR206 in October 2018 for the
treatment of cUTI and hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia (HABP/VABP). In February 2019, we were
granted QIDP designation for SPR720 capsule for oral use for the treatment of lung infections caused by nontuberculous mycobacteria and for the
treatment of lung infections caused by Mycobacterium tuberculosis.

In addition to the expedited review benefits for which a QIDP-designated drug candidate may be eligible, such a drug that is approved for the use for

which the QIDP designation was granted will receive a five-year extension to any non-patent marketing exclusivity period for which the drug qualified
upon approval, such as five-year NCE exclusivity, three-year new clinical data exclusivity, seven-year orphan exclusivity, or six-month pediatric
exclusivity. This so-called GAIN exclusivity extension is not available to a QIDP-designated drug that has previously received the five-year extension
period, such as when an applicant is seeking approval for a new indication or new strength.  

Orphan Drug Designation and Exclusivity

In March 2020, the FDA granted orphan drug designation for SPR720 for the treatment of NTM infection. Under the Orphan Drug Act, the FDA
may grant orphan drug designation to a drug intended to treat a rare disease or condition, which is generally a disease or condition that affects either (i)
fewer than 200,000 individuals in the United States, or (ii) more than 200,000 individuals in the United States and for which there is no reasonable
expectation that the cost of developing and making available in the United States a drug for this type of disease or condition will be recovered from sales in
the United States for that drug. Legislative proposals are currently being considered that would revise or revoke the second option available for a drug
candidate to receive an orphan designation, the so-called “cost recovery” pathway. Orphan drug designation must be requested before submitting an NDA.
After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use will be disclosed publicly by the FDA; the
posting will also indicate whether a drug is no longer designated as an orphan drug.

More than one product candidate may receive an orphan drug designation for the same indication, and the same product candidate can be designated

for more than one qualified orphan indication. The benefits of orphan drug designation include research and development tax credits and exemption from
FDA prescription drug user fees. Orphan drug designation does not convey any advantage in or shorten the duration of the regulatory review and approval
process if or when an NDA for the drug candidate is filed.

If a product that has orphan drug designation subsequently receives the first FDA approval for the indication for which it has such designation, the

product is entitled to orphan product exclusivity, which means that for seven years, the FDA may not approve any other marketing applications for the
same drug for the same indication, except under limited circumstances described further below. Orphan exclusivity does not block the approval of a
different drug for the same rare disease or condition, nor does it block the approval of the same drug for different conditions. As a result, even if one of our
product candidates receives orphan drug exclusivity, the FDA can still approve different drugs for use in treating the same indication or disease, which
could create a more competitive market for our drug products, if approved for marketing in the future. Additionally, if a drug designated as an orphan
product receives marketing approval for an indication broader than what was designated, it may not be entitled to orphan drug exclusivity.

Orphan exclusivity will not bar approval of another product with the same drug for the same condition under certain circumstances, including if a

subsequent product with the same drug for the same condition is shown to be clinically superior to the approved product on the basis of greater efficacy or
safety or a major contribution to patient care, or if the company with orphan drug exclusivity cannot assure the availability of sufficient quantities of the
drug to meet the needs of persons with the disease or condition for which the drug was designated. Following amendments made to the statute as part the
FDA Reauthorization Act of 2017, the FDA is required to publish a summary of the clinical superiority findings when a drug is eligible for orphan product
exclusivity on the basis of a demonstration of clinical superiority.

In addition, the FDA finalized guidance in 2018 indicating that it does not expect to grant any additional orphan drug designation to products for
pediatric subpopulations of common diseases. Nevertheless, FDA intends to still grant orphan drug designation to a drug that otherwise meets all other
criteria for designation when it prevents, diagnoses or treats either (i) a rare disease that includes a rare pediatric subpopulation, (ii) a pediatric
subpopulation that constitutes a valid orphan subset, or (iii) a rare disease that is in fact a different disease in the pediatric population as compared to the
adult population.

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Pediatric Exclusivity

Pediatric exclusivity is another type of non-patent marketing exclusivity available in the United States and, if granted, it provides for the attachment
of an additional six months of marketing protection to the term of any existing regulatory exclusivity or listed patents. Under the Best Pharmaceuticals for
Children Act, or BPCA, certain therapeutic candidates may obtain an additional six months of exclusivity if the sponsor submits information requested in
writing by the FDA, referred to as a Written Request, relating to the use of the active moiety of the product candidate in children. The data do not need to
show the product to be effective in the pediatric population studied; rather, the additional protection is granted if the pediatric clinical trial is deemed to
have fairly responded to the FDA’s Written Request. Although the FDA may issue a Written Request for studies on either approved or unapproved
indications, it may only do so where it determines that information relating to that use of a product candidate in a pediatric population, or part of the
pediatric population, may produce health benefits in that population. The issuance of a Written Request does not require the sponsor to undertake the
described trials. This is not a patent term extension, but it effectively extends the regulatory period during which the FDA cannot approve another
application.

Foreign Regulation

In addition to regulations in the United States, we will be subject to a variety of foreign regulations governing clinical trials and commercial sales

and distribution of our products. Whether or not we obtain FDA approval for a product, we must obtain approval by the comparable regulatory authorities
of foreign countries or economic areas, such as the European Union, or EU, and Australia, before we may commence clinical trials or market products in
those countries or areas. The approval process and requirements governing the conduct of clinical trials, product authorization, pricing and reimbursement
vary greatly from place to place, and the time may be longer or shorter than that required for FDA approval.

Before clinical trials may be conducted in any EU Member State, a sponsor must submit a clinical trial authorization application, or CTA, which must

be approved in each country in which the sponsor intends to perform a clinical trial. The procedure for submitting a CTA was set forth in an existing EU
Clinical Trial Directive. However, the way clinical trials are conducted in the EU underwent a major change when the Clinical Trial Regulation became
effective, which initially had been scheduled to occur in 2019 but has been delayed. The Regulation harmonizes the assessment and supervision processes for
clinical trials throughout the EU, via an EU portal and database. The European Medicines Agency, or the EMA, will set up and maintain the portal and
database, in collaboration with the EU Member States and the European Commission.

In June 2016, the electorate in the United Kingdom. voted in favor of leaving the EU (commonly referred to as “Brexit”). Thereafter, in March 2017, the

country formally notified the EU of its intention to withdraw pursuant to Article 50 of the Lisbon Treaty, and the United Kingdom formally left the EU on
January 31, 2020. A transition period began on February 1, 2020, during which EU pharmaceutical law remained applicable to the United Kingdom. This
transition period ended on December 31, 2020. Since the regulatory framework in the United Kingdom covering the quality, safety and efficacy of
pharmaceutical products, clinical trials, marketing authorization, commercial sales and distribution of medicinal products is derived from EU Directives and
Regulations, Brexit could materially impact the future regulatory regime which applies to products and the approval of product candidates in the United
Kingdom, as United Kingdom legislation now has the potential to diverge from EU legislation. It remains to be seen how Brexit will impact the regulatory
regime in the United Kingdom in the long-term. The Medicines and Healthcare products Regulatory Agency has recently published detailed guidance for
industry and organizations to follow from January 1, 2021 now the transition period is over, which will be updated as the United Kingdom’s regulatory position
on medicinal products evolves over time.

The goal of Clinical Trial Regulation is to create an environment that is favorable to conducting clinical trials in the EU, with the highest standards

of safety for participants and increased transparency of trial information. The Regulation will require consistent rules for conducting clinical trials
throughout the EU and information on the authorization, conduct and results of each clinical trial carried out in the EU to be publicly available.

When the Regulation becomes applicable, it will replace the existing EU Clinical Trial Directive and national legislation that was put in place to

implement the Directive. It will also apply to trials authorized under the previous legislation if they are still ongoing three years after the Regulation
becomes effective. The authorization and oversight of clinical trials will remain the responsibility of EU Member States, with EMA managing the database
and supervising content publication on the public website.

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Under EU regulatory systems, a company may submit marketing authorization applications either under a centralized or decentralized procedure.

The centralized procedure is compulsory for medicinal products produced by biotechnology or those medicinal products containing new active substances
for specific indications such as the treatment of AIDS, cancer, neurodegenerative disorders, diabetes, viral diseases and designated orphan medicines, and
optional for other medicines which are highly innovative. Under the centralized procedure, a marketing application is submitted to the EMA where it will
be evaluated by the Committee for Medicinal Products for Human Use and a favorable opinion typically results in the grant by the European Commission
of a single marketing authorization that is valid for all EU Member States within 67 days of receipt of the opinion. The initial marketing authorization is
valid for five years, but once renewed is usually valid for an unlimited period. The decentralized procedure provides for approval by one or more
“concerned” member states based on an assessment of an application performed by one member state, known as the “reference” member state. Under the
decentralized approval procedure, an applicant submits an application, or dossier, and related materials to the reference member state and concerned
member states. The reference member state prepares a draft assessment and drafts of the related materials within 120 days after receipt of a valid
application. Within 90 days of receiving the reference member state’s assessment report, each concerned member state must decide whether to approve the
assessment report and related materials. If a member state does not recognize the marketing authorization, the disputed points are eventually referred to the
European Commission, whose decision is binding on all member states.

Pharmaceutical Coverage, Pricing and Reimbursement

Sales of our products, if approved for marketing, will depend, in part, on the availability and extent of coverage and reimbursement by third-party

payors, such as government health programs, including Medicare and Medicaid, commercial insurance and managed healthcare organizations. These third-
party payors are increasingly challenging the price and limiting the coverage and reimbursement amounts for medical products and services. There may be
significant delays in obtaining coverage and reimbursement for approved products, and coverage may be more limited than the purposes for which the
product is approved by the FDA or regulatory authorities in other countries. It is time consuming and expensive to seek reimbursement from third-party
payors. Moreover, eligibility for reimbursement does not imply that any product will be paid for in all cases or at a rate that covers our costs, including
research, development, manufacture, sale and distribution. Interim payments for new products, if applicable, may also not be sufficient to cover our costs
and may not be made permanent. Payment rates may vary according to the use of the product and the clinical setting in which it is used, may be based on
payments allowed for lower cost products that are already reimbursed and may be incorporated into existing payments for other services. Net prices for
products may be reduced by mandatory discounts or rebates required by third-party payors and by any future relaxation of laws that presently restrict
imports of products from countries where they may be sold at lower prices than in the United States. In the United States, third-party payors often rely upon
Medicare coverage policy and payment limitations in setting their own reimbursement policies, but they also have their own methods and approval process
apart from Medicare coverage and reimbursement determinations. Accordingly, one third-party payor’s determination to provide coverage for a product
does not assure that other payors will also provide coverage for the product.

In addition, the containment of healthcare costs has become a priority for federal and state governments, and the prices of drugs have been a focus in

this effort. The United States government, state legislatures and foreign governments have shown significant interest in implementing cost-containment
programs, including price controls, restrictions on coverage and reimbursement, and requirements for substitution of generic products. Adoption of price
controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit
our net revenue and results. Decreases in third-party reimbursement for our product candidates or a decision by a third-party payor to not cover our product
candidates could reduce physician usage of the product candidate and have a material adverse effect on our sales, results of operations and financial
condition. Moreover, there has been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products,
which has resulted in several Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more
transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government program
reimbursement methodologies for drug products. Individual states in the United States have also increasingly passed legislation and implemented
regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain
product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and
bulk purchasing. In December 2020, the U.S. Supreme Court held unanimously that federal law does not preempt the states’ ability to regulate
pharmaceutical benefit managers, or PBMs, and other members of the health care and pharmaceutical supply chain, an important decision that may lead to
further and more aggressive efforts by states in this area.

In the United States, the federal government provides health insurance for people who are 65 years or older, and certain people with disabilities or

certain conditions irrespective of their age, through the Medicare program, which is administered by the Centers for Medicare & Medicaid Services, or
CMS. Coverage and reimbursement for products and services under Medicare are determined in accordance with the Social Security Act and pursuant to
regulations promulgated by CMS, as well as the agency’s coverage and reimbursement guidance and determinations. Drugs and other products that are
utilized within the hospital in-patient setting are typically reimbursed under a prospective payment system, or a predetermined payment amount that is
based on diagnosis related groups, or DRGs for Medicare patients and under a bundled payment for commercially insured patients. These payment amounts
differ by type of diagnoses, procedures performed and the severity of the patient’s condition, among other things. A drug that is used in a treatment or
procedure under a specific DRG or bundled payment is generally not eligible for any separate payment. For catastrophic cases where costs greatly exceed
the bundled payment amount, the hospital may be eligible for an outlier payment that is intended to cover part of the expense above the standard payment.

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Medicaid is a health insurance program for low-income children, families, pregnant women, and people with disabilities that is jointly funded by the

federal and state governments, but administered by the states. In general, state Medicaid programs are required to cover drugs and biologicals of
manufacturers that have entered into a Medicaid Drug Rebate Agreement, although such drugs and biologicals may be subject to prior authorization or
other utilization controls.

The United States Congress and state legislatures from time to time propose and adopt initiatives aimed at cost containment, which could impact our

ability to sell our products profitably. For example, the federal Patient Protection and Affordable Care Act, as amended by the Health Care and Education
Reconciliation Act of 2010, known collectively as the ACA, among other things, contains provisions that may reduce the profitability of drug products
through increased rebates for drugs reimbursed by Medicaid programs, extension of Medicaid rebates to Medicaid managed care plans, mandatory
discounts for certain Medicare Part D beneficiaries and annual fees based on pharmaceutical companies’ share of sales to federal health care programs.
Adoption of general controls and measures, coupled with the tightening of restrictive policies in jurisdictions with existing controls and measures, could
limit payments for pharmaceutical drugs. The Medicaid Drug Rebate Program requires pharmaceutical manufacturers to enter into and have in effect a
national rebate agreement with the Secretary of the Department of Health and Human Services, or DHHS, as a condition for states to receive federal
matching funds for manufacturers’ outpatient drugs furnished to Medicaid patients. The ACA also expanded the universe of Medicaid utilization subject to
drug rebates by requiring pharmaceutical manufacturers to pay rebates on Medicaid managed care utilization and by enlarging the population potentially
eligible for Medicaid drug benefits.  As another example, the 2021 Consolidated Appropriations Act signed into law on December 27, 2020 incorporated
extensive healthcare provisions and amendments to existing laws, including a requirement that all manufacturers of drug products covered under Medicare
Part B report the product’s average sales price, or ASP, to DHHS beginning on January 1, 2022, subject to enforcement via civil money penalties.  

Since its enactment, there have been judicial and Congressional challenges to certain aspects of the ACA and as a result certain sections of the ACA

have not been fully implemented or effectively repealed. Members of Congress have indicated that they may continue to seek to modify, repeal or
otherwise invalidate all, or certain provisions of, the ACA. For example, the Tax Cuts and Jobs Act, or TCJA, was enacted in 2017 and, among other
things, removed penalties, starting January 1, 2019, for not complying with the ACA’s individual mandate to carry health insurance, commonly referred to
as the “individual mandate.” In December 2018, a U.S. District Court Judge in the Northern District of Texas ruled that the individual mandate was a
critical and inseverable feature of the ACA, and therefore, because it was repealed as part of the TCJA, the remaining provisions of the ACA were invalid
and the law in its entirety was unconstitutional. In December 2019, the U.S. Court of Appeals for the Fifth Circuit upheld the District Court ruling that the
individual mandate was unconstitutional but remanded the case back to the District Court to determine whether other reforms enacted as part of the ACA
but not specifically related to the individual mandate or health insurance could be severed from the rest of the ACA so as not to be declared invalid as well.
On March 2, 2020, the United States Supreme Court granted the petitions for writs of certiorari to review this case and allocated one hour for oral
arguments, which occurred on November 10, 2020. A decision from the Supreme Court is expected to be issued in mid-2021. The uncertainty around the
future of the ACA, and in particular the impact to reimbursement levels, may lead to uncertainty or delay in the purchasing decisions of our customers,
which may in turn negatively impact our product sales. If there are not adequate reimbursement levels, our business and results of operations could be
adversely affected.

In addition, in some foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements

governing drug pricing vary widely from country to country. For example, in the EU, the sole legal instrument at the EU level governing the pricing and
reimbursement of medicinal products is Council Directive 89/105/EEC, or the Price Transparency Directive. The aim of this Directive is to ensure that
pricing and reimbursement mechanisms established in the EU Member States are transparent and objective, do not hinder the free movement of and trade in
medicinal products in the EU, and do not hinder, prevent or distort competition on the market. The Price Transparency Directive does not provide any
guidance concerning the specific criteria on the basis of which pricing and reimbursement decisions are to be made in individual EU Member States, nor
does it have any direct consequence for pricing or reimbursement levels in individual EU Member States. The EU Member States are free to restrict the
range of medicinal products for which their national health insurance systems provide reimbursement, and to control the prices and/or reimbursement levels
of medicinal products for human use. An EU Member State may approve a specific price or level of reimbursement for the medicinal product, or
alternatively adopt a system of direct or indirect controls on the profitability of the company responsible for placing the medicinal product on the market,
including volume-based arrangements, caps and reference pricing mechanisms.

Health Technology Assessment, or HTA, of medicinal products is becoming an increasingly common part of the pricing and reimbursement
procedures in some EU Member States, including France, Germany, Ireland, Italy and Sweden. The HTA process in the EU Member States is governed by
the national laws of these countries. HTA is the procedure according to which the assessment of the public health impact, therapeutic impact, and the
economic and societal impact of use of a given medicinal product in the national healthcare systems of the individual country is conducted. HTA generally
focuses on the clinical efficacy and effectiveness, safety, cost, and cost-effectiveness of individual medicinal products as well as their potential implications
for the healthcare system. Those elements of medicinal products are compared with other treatment options available on the market. The outcome of HTA
regarding specific medicinal products will often influence the pricing and reimbursement status granted to these medicinal products by the

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competent authorities of individual EU Member States. The extent to which pricing and reimbursement decisions are influenced by the HTA of the specific
medicinal product vary between EU Member States. A negative HTA of one of our products by a leading and recognized HTA body could not only
undermine our ability to obtain reimbursement for such product in the EU Member State in which such negative assessment was issued, but also in other
EU Member States. For example, EU Member States that have not yet developed HTA mechanisms could rely to some extent on the HTA performed in
countries with a developed HTA framework when adopting decisions concerning the pricing and reimbursement of a specific medicinal product.

Other Healthcare Laws

Our current and future business operations are subject to healthcare regulation and enforcement by the federal government and the state and

foreign governments where we research, and, if approved, market, sell and distribute our therapeutic candidates. These laws include, without limitation,
state and federal anti-kickback, fraud and abuse, false claims, privacy and security, physician sunshine and drug pricing transparency laws and regulations
such as:

•

•

•

•

•

The federal Anti-Kickback Statute prohibits, among other things, any person from knowingly and willfully offering, soliciting, receiving
or providing remuneration, directly or indirectly, to induce either the referral of an individual, for an item or service or the purchasing or
ordering of a good or service, for which payment may be made under federal healthcare programs such as the Medicare and Medicaid
programs. The federal Anti-Kickback Statute is subject to evolving interpretations. In the past, the government has enforced the federal
Anti-Kickback Statute to reach large settlements with healthcare companies based on sham consulting and other financial arrangements
with physicians. A person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have
committed a violation. In addition, the government may assert that a claim including items or services resulting from a violation of the
federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the civil False Claims Act;

The federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalty laws, prohibit, among
other things, knowingly presenting or causing the presentation of a false, fictitious or fraudulent claim for payment to the U.S.
government, knowingly making, using, or causing to be made or used a false record or statement material to a false or fraudulent claim to
the U.S. government, or from knowingly making a false statement to avoid, decrease or conceal an obligation to pay money to the U.S.
government. Actions under these laws may be brought by the Attorney General or as a qui tam action by a private individual in the name
of the government. The federal government uses these laws, and the accompanying threat of significant liability, in its investigation and
prosecution of pharmaceutical and biotechnology companies throughout the U.S., for example, in connection with the promotion of
products for unapproved uses and other allegedly unlawful sales and marketing practices;

The U.S. federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, created new federal, civil and criminal statutes
that prohibit among other actions, knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit
program, including private third-party payors, knowingly and willfully embezzling or stealing from a healthcare benefit program, willfully
obstructing a criminal investigation of a healthcare offense, and knowingly and willfully falsifying, concealing or covering up a material
fact or making any materially false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare
benefits, items or services. Similar to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the
statute or specific intent to violate it in order to have committed a violation;

The Physician Payments Sunshine Act, enacted as part of the ACA, among other things, imposes reporting requirements on manufacturers
of FDA-approved drugs, devices, biologics and medical supplies covered by Medicare or Medicaid to report, on an annual basis, to DHHS
information related to payments and other transfers of value to physicians (defined to include doctors, dentists, optometrists, podiatrists,
chiropractors and, beginning in 2022 for payments and other transfers of value provided in the previous year, certain advanced non-
physician health care practitioners), teaching hospitals, as well as ownership and investment interests held by physicians and their
immediate family members;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, or HITECH, and their respective
implementing regulations impose specified requirements relating to the privacy, security and transmission of individually identifiable
health information. Among other things, HITECH makes HIPAA’s privacy and security standards directly applicable to “business
associates,” defined as independent contractors or agents of covered entities, which include certain healthcare providers, health plans, and
healthcare clearinghouses, that create, receive, maintain or transmit protected health information in connection with providing a service
for or on behalf of a covered entity. HITECH also increased the civil and criminal penalties that may be imposed against covered entities,
business associates and possibly other persons, and gave state attorneys general new authority to file civil actions for damages or
injunctions in federal courts to enforce HIPAA and seek attorney’s fees and costs associated with pursuing federal civil actions; and

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•

Analogous state laws and regulations, such as state anti-kickback and false claims laws which may apply to sales or marketing
arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private
insurers; state laws which require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance
guidelines and the relevant compliance guidance promulgated by the federal government in addition to requiring drug and therapeutic
biologics manufacturers to report information related to payments to physicians and other healthcare providers or marketing expenditures
and pricing information; state and local laws which require the registration of pharmaceutical sales representatives; and state laws and
non-United States laws and regulations that govern the privacy and security of health information in certain circumstances, many of which
differ from each other in significant ways, thus complicating compliance efforts.

Healthcare Reform

In the United States and some foreign jurisdictions, there have been, and continue to be, several legislative and regulatory changes and proposed

changes regarding the healthcare system that could prevent or delay marketing approval of product candidates, restrict or regulate post-approval activities,
and affect the ability to profitably sell product candidates that obtain marketing approval. The FDA’s and other regulatory authorities’ policies may change
and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our current or future product candidates.
For example, in August 2017, the FDA Reauthorization Act was signed into law, which reauthorized the FDA’s user fee programs and included additional
drug and device amendments to the FDCA, and in December 2019, former President Trump signed into law the Creating and Restoring Equal Access to
Equivalent Samples Act or the “CREATES Act,” which aims to address the concern articulated by both the FDA and others in the industry that some
reference product manufacturers have improperly restricted the distribution of their products, including by invoking the existence of a REMS for certain
products, to deny generic product developers access to samples of brand products. The CREATES Act established a private cause of action that permits a
generic product developer to sue the reference product manufacturer to compel it to furnish the necessary samples on “commercially reasonable, market-
based terms.” Whether and how generic product developers will use this new pathway, as well as the likely outcome of any legal challenges to provisions
of the CREATES Act, remain highly uncertain and its potential effects on our future commercial products are unknown.

As another example, in November 2020 the Trump Administration finalized regulations aimed at implementing a system whereby state

governmental entities could lawfully import and distribute prescription drugs sourced from Canada, with the stated goal of lowering drug prices
domestically. However, the impact of such future programs is uncertain, in part because lawsuits have been filed challenging the government’s authority to
promulgate these regulations, but also because they may be vulnerable to being overturned by a joint resolution of disapproval from Congress under the
procedures set forth in the Congressional Review Act, which could be applied to regulatory actions taken by the Trump Administration on or after August
21, 2020 (i.e., in the last 60 days of legislative session of the 116th Congress). Other regulatory actions that were initiated or finalized during the final
months of the Trump Administration are also subject to uncertainty following the January 20, 2021 transition to a new Democrat-led presidential
administration. Following his inauguration, President Biden took immediate steps to order a regulatory freeze on all pending substantive executive actions
in order to permit incoming department and agency heads to review whether questions of fact, policy, and law may be implicated and to determine how to
proceed.

If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to
maintain regulatory compliance, we may lose any marketing approval that we otherwise may have obtained and we may not achieve or sustain profitability,
which would adversely affect our business, prospects, financial condition and results of operations. Moreover, among policy makers and payors in the
United States and elsewhere, there is significant interest in promoting changes in healthcare systems with the stated goals of containing healthcare costs,
improving quality and/or expanding access.

Manufacturing

We do not own or operate manufacturing facilities for the production of any of our product candidates, nor do we have plans to develop our own

manufacturing operations in the foreseeable future. We currently rely on a limited number of third-party contract manufacturers for all of our required raw
materials, drug substance, and finished drug product for our preclinical research and clinical trials. We currently employ internal resources to manage our
manufacturing. We intend to have two suppliers for tebipenem HBr’s active pharmaceutical ingredient. Each supplier would be capable of producing
kilogram quantities for commercial scale and would be able to produce over 10kg of active pharmaceutical ingredient under cGMP conditions.

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Human Capital

As of December 31, 2020, we had 89 full-time employees, including a total of 20 employees with M.D. or Ph.D. degrees. Of these employees, 55

employees were primarily engaged in research and development activities, and 34 provide administrative, business and operations support. All of these
employees were based in the United States. None of our employees are represented by labor unions or covered by collective bargaining agreements. We
consider our employee relations to be good.

We hire and maintain an experienced, committed, diverse, inclusive and highly motivated workforce. Effective attraction, development, and
retention of human resource talent, or human capital, is vital to the success of our mission-driven growth strategy. We face intense competition for qualified
individuals from numerous pharmaceutical and biotechnology companies, universities, governmental entities and other research institutions, and we believe
that our future success will depend in large part on our continued ability to attract and retain highly skilled employees. To attract qualified applicants to our
company and retain our employees, we offer a competitive rewards package consisting of base salary and cash target bonus, a comprehensive benefit
package and equity compensation.

We want our employees to learn, grow and look for ways to help develop skills through industry, company and functional training, as well as
mentoring opportunities. We offer a robust set of career-enhancing learning experiences and initiatives to all employees, aligned with our mission, vision,
and values.

Our Corporate Information

We were formed as Spero Therapeutics, LLC in December 2013 under the laws of the State of Delaware. On June 30, 2017, through a series of

transactions, Spero Therapeutics, LLC merged with and into Spero Therapeutics, Inc. (formerly known as Spero OpCo, Inc.), a Delaware corporation. Our
principal executive offices are located at 675 Massachusetts Avenue, Cambridge, Massachusetts 02139, and our telephone number is (857) 242-1600. Our
website address is www.sperotherapeutics.com.

Available Information

Financial and other information about us is available on our website. We make available on our website, free of charge, copies of our Annual Report
on Form 10-K, Quarterly Reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a)
or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the United States Securities
and Exchange Commission, or the SEC. The information contained in our website is not intended to be a part of this filing.

Item 1A. Risk Factors.

Careful consideration should be given to the following risk factors, in addition to the other information set forth in this Annual Report on Form 10-

K, including the section of this Annual Report on Form 10-K titled “Management’s Discussion and Analysis of Financial Condition and Results of
Operations” and our consolidated financial statements and related notes, and in other documents that we file with the SEC, in evaluating our company and
our business. Investing in our securities involves a high degree of risk. If any of the events described in the following risk factors and the risks described
elsewhere in this Annual Report on Form 10-K actually occurs, our business, financial condition, results of operations and future growth prospects could
be materially and adversely affected, and the trading price of our securities could decline. Our actual results could differ materially from those anticipated
in the forward-looking statements as a result of factors that are described below and elsewhere in this Annual Report on Form 10-K.

Risks Related to the COVID-19 Pandemic

The outbreak of the novel strain of coronavirus, SARS-CoV-2, which causes COVID-19, could adversely impact our business, including our
preclinical studies and clinical trials.

Public health crises such as pandemics or similar outbreaks could adversely impact our business.  In December 2019, a novel strain of coronavirus,
SARS-CoV-2, which causes coronavirus disease 2019 (COVID-19), surfaced in Wuhan, China. Since then, COVID-19 has spread globally. In response to
the spread of COVID-19, we have closed our offices with our administrative employees continuing their work outside of our offices and restricted on-site
staff to only those required to execute their job responsibilities.

As a result of the COVID-19 outbreak, or similar pandemics, we have experienced, and may in the future experience, certain disruptions that could

materially impact our business, preclinical studies and clinical trials.  Such disruptions may include:

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•

•

delays or difficulties in enrolling patients in our clinical trials;

delays or difficulties in clinical site initiation, including difficulties in recruiting clinical site investigators and clinical site staff;

delays or disruptions in preclinical studies or clinical trials due to unforeseen circumstances at contract research organizations and vendors
along their supply chain;

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increased rates of patients withdrawing from our clinical trials following enrollment as a result of contracting COVID-19, being forced to
quarantine, or not being willing to travel to clinical trial sites;

diversion of healthcare resources away from the conduct of clinical trials, including the diversion of hospitals serving as our clinical trial
sites and hospital staff supporting the conduct of our clinical trials;

interruption of key clinical trial activities, such as clinical trial site data monitoring and data collection, due to limitations on travel
imposed or recommended by federal or state governments, employers and others or interruption of clinical trial subject visits and study
procedures (particularly any procedures that may be deemed non-essential), which may impact the integrity of subject data and clinical
study endpoints;

interruption or delays in the operations of the FDA and comparable foreign regulatory agencies, which may impact approval timelines and
other agency interactions;

interruption of, or delays in receiving, supplies of our product candidates from our contract manufacturing organizations due to staffing
shortages, production slowdowns or stoppages and disruptions in delivery systems; and

limitations on employee resources that would otherwise be focused on the conduct of our preclinical studies and clinical trials, including
because of sickness of employees or their families, the desire of employees to avoid contact with large groups of people, continued
reliance on working from home or mass transit disruptions.

These and other factors arising from the COVID-19 pandemic could worsen in countries that are already afflicted with COVID-19 or could return to

countries where the pandemic has been partially contained, each of which could further adversely impact our ability to conduct clinical trials and our
business generally, and could have a material adverse impact on our business, operations and financial condition and results.

In addition, the trading prices for our common stock and the securities of other biopharmaceutical companies have been highly volatile. As a result,
we may face difficulties raising capital through sales of our common stock or such sales may be on unfavorable terms. The COVID-19 outbreak continues
to evolve rapidly. The extent to which the outbreak may impact our business, preclinical studies and clinical trials will depend on future developments,
which are highly uncertain and cannot be predicted with confidence, such as the duration of the outbreak, travel restrictions and actions to contain the
outbreak or treat its impact, such as social distancing and quarantines or lock-downs in the United States and other countries, business closures or business
disruptions and the effectiveness of actions taken in the United States and other countries to contain and treat the disease.

Risks Related to Our Financial Position and Need for Additional Capital

We have not generated any revenue from the sale of our products, have a history of losses and expect to incur substantial future losses. The report of
our auditor on our consolidated financial statements expresses substantial doubt about our ability to continue as a going concern; if we are unable to
obtain additional capital, we may not be able to continue our operations on the scope or scale as currently conducted, and that could have a material
adverse effect on our business, results of operations and financial condition.

We have not generated any revenue from the sale of our products and have incurred losses in each year since our inception in 2013. Our net losses

were $78.3 million and $60.9 million during the years ended December 31, 2020 and 2019, respectively. All of our product candidates are in development,
none have been approved for sale and we may never have a product candidate approved for commercialization.

In accordance with Accounting Standards Update, or ASU, 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going
Concern (Subtopic 205-40), we are required to evaluate whether there are conditions and events, considered in the aggregate, that raise substantial doubt
about our ability to continue as a going concern from the issuance date of our financial statements. Based on our current plans, we believe that our existing
cash, cash equivalents and marketable securities as of December 31, 2020, together with the committed funding from our existing BARDA contract and
other non-dilutive funding commitments, will enable us to fund our operating expenses and capital expenditure requirements into the second quarter of
2022, including through the submission of the NDA for tebipenem HBr. This timeline is subject to uncertainty as to the timing of future expenditures. We
have developed plans to mitigate this risk, which primarily consist of raising additional capital through some combination of equity or debt financings,
potential new collaborations, additional grant funding and/or reducing cash expenditures. If we are not able to secure adequate additional funding, we plan
to make reductions in spending. In that event, we may have to delay, scale back, or eliminate some or all of our planned clinical trials, research stage
programs and commercial activities. The actions necessary to reduce spending under this plan at a level that mitigates the factors described above is not
considered probable, as defined in the accounting standards and therefore, the full extent to which management may extend our funds through these actions
may not be considered in management’s assessment of our ability to continue as a going concern. As a result, we have concluded that substantial doubt
exists about our ability to continue as a going concern.

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We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future; if we are unable to achieve

commercialization, revenue from product sales, and, ultimately, profitability, the market value of our common stock will likely decline.

We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future as we continue to advance our product
candidates through preclinical and clinical development and seek marketing approval for such candidates if clinical trials are successful. Our expenses will
also increase substantially if and as we:

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conduct additional clinical trials and studies of our product candidates;

continue to discover and develop additional product candidates;

establish a sales, marketing and distribution infrastructure to commercialize any product candidates for which we may obtain marketing
approval;

establish manufacturing and supply chain capacity sufficient to provide commercial quantities of any product candidates for which we
may obtain marketing approval;

maintain, expand and protect our intellectual property portfolio;

hire additional clinical, scientific and commercial personnel;

add operational, financial and management information systems and personnel, including personnel to support our product development
and planned future commercialization efforts; and

acquire or in-license other product candidates and technologies.

If our product candidates fail to demonstrate safety and efficacy in clinical trials, do not gain regulatory approval, or do not achieve market
acceptance following regulatory approval and commercialization, we may never become profitable. Even if we achieve profitability in the future, we may
not be able to sustain profitability in subsequent periods. Our prior losses, combined with expected future losses, have had and will continue to have an
adverse effect on our stockholders’ equity and working capital. If we are unable to achieve and sustain profitability, the market value of our common stock
will likely decline.

Because of the numerous risks and uncertainties associated with developing biopharmaceutical products, we are unable to predict the extent of any

future losses or when, if ever, we will become profitable. Our expenses could increase if we are required by the FDA, or any comparable foreign regulatory
authority to perform studies in addition to those currently expected, or if there are any delays in completing our clinical trials or the development of any of
our product candidates.

We expect that we will need substantial additional funding. If we are unable to raise capital when needed, or do not receive payment under our
government awards, we could be forced to delay, reduce or eliminate our product development programs or commercialization efforts.

Developing pharmaceutical products, including conducting preclinical studies and clinical trials, is a time-consuming, expensive and uncertain
process that takes years to complete. We expect that our expenses will continue to increase as we commence and advance our ongoing and planned clinical
trials and other studies of tebipenem HBr, SPR720 and SPR206, seek marketing approval for tebipenem HBr, and evaluate the advancement of our other
product candidates. If we obtain marketing approval for tebipenem HBr or any other product candidate, we expect to incur significant commercialization
expenses related to product sales, marketing, distribution and manufacturing. Some of these expenses may be incurred in advance of marketing approval,
and could be substantial. Accordingly, we will be required to obtain further funding through public or private equity offerings, debt financings,
collaborations, licensing arrangements, government funding or other sources. Adequate additional financing may not be available to us on acceptable
terms, or at all. Our failure to raise capital as and when needed would have a negative effect on our financial condition and our ability to pursue our
business strategy.

We believe that our existing cash, cash equivalents and marketable securities as of December 31, 2020, together with the committed funding from

our existing BARDA contract and other non-dilutive funding commitments will enable us to fund our operating expenses and capital expenditure
requirements into the second quarter of 2022, including through the submission of the NDA for tebipenem HBr. Our cash forecasts are based on
assumptions that may prove to be wrong, and we could use our available capital resources sooner than we currently expect. Changing circumstances could
cause us to consume capital significantly faster than we currently anticipate, and we may need to spend more than currently expected because of
circumstances beyond our control. Our future funding requirements, both short-term and long-term, will depend on many factors, including:

•

•

the timing, costs and results of our ongoing, planned and potential clinical trials for our product candidates;

the amount of funding that we receive under our government awards;

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the number and characteristics of product candidates that we pursue;

the outcome, timing and costs of seeking regulatory approvals;

the costs of commercialization activities for tebipenem HBr and other product candidates if we receive marketing approval, including the
costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

the receipt of marketing approval and revenue received from any potential commercial sales of tebipenem HBr;

the terms and timing of any future collaborations, licensing or other arrangements that we may establish;

the amount and timing of any payments we may be required to make, or that we may receive, in connection with the licensing, filing,
prosecution, defense and enforcement of any patents or other intellectual property rights, including milestone and royalty payments and
patent prosecution fees that we are obligated to pay pursuant to our license agreements;

the costs of preparing, filing and prosecuting patent applications, maintaining and protecting our intellectual property rights and defending
against any intellectual property related claims;

the costs of our continued operation as a public company; and

the extent to which we in-license or acquire other products and technologies.

For the year ended December 31, 2020, our non-dilutive sources of funding consisted of an award from BARDA for tebipenem HBr, an award from

NIAID under its Small Business Innovation Research program or SBIR, for our SPR720 program, an award from NIAID for SPR206, an award from the
DoD that provides partial funding for the development of our Potentiator product candidates and an award from the DoD Congressionally Directed Medical
Research Programs, or CDMRP, Joint Warfighter Medical Research Program for SPR206.

The BARDA award provides total reimbursement to us of $46.8 million for qualified expenses for tebipenem HBr development over a five-year
period through November 2021. The award initially committed funding of $15.7 million over a three-year base period from July 2018 to June 2021 for
cUTI development activities. In May 2019, the contract was modified to include additional funding of approximately $2.5 million for tebipenem HBr,
increasing the amount of initial committed funding from $15.7 million to approximately $18.2 million. In February 2020, BARDA exercised its first option
under the contract, committing $15.9 million for tebipenem HBr through November 2021. Total committed funding under the BARDA award to date is
$34.1 million, including the first option exercised in 2020. There is a second option exercisable by BARDA for the remaining $12.7 million of funding,
subject to specified milestones being achieved under the award agreement. As part of our tebipenem HBr collaboration with BARDA described above,
there will be studies assessing the efficacy of tebipenem HBr in treatment of infections caused by biodefense threats such as anthrax, plague, and
melioidosis, including a clinical trial in pneumonia patients. The Defense Threat Reduction Agency, or DTRA, will provide up to $10.0 million in addition
to the total potential $46.8 million from BARDA, to cover the cost of the nonclinical biodefense aspects of the collaboration program. While such funding
would be for the purpose of developing tebipenem HBr in these areas, we will not receive any funds directly from DTRA. Upon these achievements,
BARDA may exercise its second option to fund a Phase 2 clinical trial in community-acquired bacterial pneumonia patients to demonstrate safety and data
suggestive of efficacy.

The NIAID contract for SPR206 provides for total development funding of up to $6.5 million over a base period and three option periods. To date,

funding for the base period and the first two option periods totaling $5.9 million have been committed. The NIAID SBIR award is structured as a base
period followed by a single option. For the base period of March 1, 2017 through February 28, 2018, NIAID committed funding of approximately
$0.6 million for the SPR720 program. In February 2018 NIAID exercised the approximately $0.4 million option, which had an initial period of
performance from March 1, 2018 through February 28, 2019. In January 2019, the period of performance for this award was extended for an additional 12-
month period. Our DoD cooperative agreement is structured as a single, two-year $1.5 million award. We are eligible for the full funding from the DoD and
there are no options to be exercised at a later date. The NIAID award is subject to termination for convenience at any time by NIAID. NIAID is not
obligated to provide funding to us beyond the base period amounts from Congressionally approved annual appropriations. The DoD CDMRP award
commits funding of $5.9 million over a four-year period to cover the costs of select Phase 1 pharmacology studies, 28-day GLP non-human primate
toxicology study and microbiological surveillance studies that would be required for a potential NDA submission with the FDA for SPR206.

38

 
 
 
 
 
 
 
 
 
 
Raising additional capital may cause dilution to our stockholders, restrict our operations or require us to relinquish rights to our technologies or
product candidates.

Unless and until we can generate a substantial amount of revenue from our product candidates, we expect to finance our future cash needs through

public or private equity offerings, debt financings, collaborations, licensing arrangements and government funding arrangements. In addition, we may seek
additional capital due to favorable market conditions or strategic considerations, even if we believe that we have sufficient funds for our current or future
operating plans. We are filing a universal shelf registration statement on Form S-3  with the SEC concurrently with the filing of this Annual Report on
Form 10-K, which when declared effective, will register for sale up to $300.0 million of any combination of our common stock, preferred stock, debt
securities, warrants, rights and/or units from time to time and at prices and on terms that we may determine, including up to $75.0 million of our common
stock available for issuance pursuant to an “at-the-market” offering program sales agreement that we entered into with Cantor Fitzgerald & Co., or Cantor.
Under the sales agreement, Cantor may sell shares of our common stock by any method permitted by law deemed to be an “at the market,” or ATM,
offering as defined in Rule 415 of the Securities Act, subject to the terms of the sales agreement.

We may seek to raise additional capital at any time. To the extent that we raise additional capital through the sale of common stock, convertible
securities or other equity securities, the ownership interest of our then existing stockholders may be materially diluted, and the terms of these securities
could include liquidation or other preferences and anti-dilution protections that could adversely affect the rights of our stockholders. In addition, debt
financing, if available, would result in increased fixed payment obligations and may involve agreements that include restrictive covenants that limit our
ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends, which could adversely affect our
ability to conduct our business. In addition, securing additional financing would require a substantial amount of time and attention from our management
and may divert a disproportionate amount of their attention away from day-to-day activities, which may adversely affect our management’s ability to
oversee the development of our product candidates.

If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we

may have to relinquish valuable rights to our technologies, future revenue streams or product candidates or grant licenses on terms that may not be
favorable to us.

Our ability to use our net operating loss carryforwards may be limited.

As of December 31, 2020, we had United States federal, state and foreign net operating loss carryforwards, or NOLs, of $228.1 million,
$226.2 million and $10.7 million, respectively.  The federal NOLs of $73.0 million will expire at various dates from 2033 to 2037 and approximately
$155.1 million can be carried forward indefinitely. The state NOLs begin to expire in 2033 and will expire at various dates through 2039.  The foreign
NOLs do not expire. Utilization of these NOLs depends on many factors, including our future income, which cannot be assured. These NOLs could expire
unused and be unavailable to offset our future income tax liabilities. In addition, under Section 382 of the Internal Revenue Code of 1986, as amended, or
the Code, and corresponding provisions of state law, if a corporation undergoes an “ownership change,” which is generally defined as a greater than 50%
change, by value, in its equity ownership by 5% stockholders over a three-year period, the corporation’s ability to use its pre-change NOLs and other pre-
change tax attributes to offset its post-change income may be limited. We have not determined if we have experienced Section 382 ownership changes in
the past and if a portion of our NOLs is subject to an annual limitation under Section 382. In addition, we may experience ownership changes in the future
as a result of subsequent changes in our stock ownership, some of which may be outside of our control. If we determine that an ownership change has
occurred and our ability to use our historical NOLs is materially limited, it would harm our future operating results by effectively increasing our future tax
obligations.

Under current United States federal tax legislation, although the treatment of net operating loss carryforwards arising in tax years beginning on or

before December 31, 2017 has generally not changed, net operating loss carryforwards arising in tax years beginning after December 31, 2017 may be used
to offset only 80% of taxable income. In addition, net operating losses arising in tax years beginning after December 31, 2017 may be carried forward
indefinitely, as opposed to the 20-year carryforward under prior law.

We have a limited operating history and no history of commercializing pharmaceutical products, which may make it difficult to evaluate the prospects
for our future viability.

We were established in 2013 and began operations in 2014. Our operations to date have been limited to financing and staffing our company,
developing our technology and developing tebipenem HBr and our other product candidates. We have not yet demonstrated an ability to successfully obtain
marketing approval, manufacture a commercial scale product, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities
necessary for successful product commercialization. Consequently, predictions about our future success or viability may not be as accurate as they could be
if we had a longer operating history or a history of successfully developing and commercializing pharmaceutical products.

39

 
We may encounter unforeseen expenses, difficulties, complications, delays and other known or unknown factors in achieving our business
objectives. We will eventually need to transition from a company with a development focus to a company capable of supporting commercial activities. We
may not be successful in such a transition.

We expect our financial condition and operating results to continue to fluctuate significantly from quarter to quarter and year to year due to a variety

of factors, many of which are beyond our control. Accordingly, stockholders should not rely upon the results of any quarterly or annual periods as
indications of future operating performance.

Risks Related to Product Development and Commercialization

We are heavily dependent on the success of tebipenem HBr, which is still under development, and our ability to develop, obtain marketing approval for
and successfully commercialize tebipenem HBr. If we are unable to develop, obtain marketing approval for and successfully commercialize tebipenem
HBr, or if we experience significant delays in doing so, our business could be materially harmed.

We currently have no products approved for sale and have invested a significant portion of our efforts and financial resources in the development of
tebipenem HBr as a product candidate for the treatment of MDR bacterial infections. Our near-term prospects are substantially dependent on our ability to
develop, obtain marketing approval for and successfully commercialize tebipenem HBr. The success of tebipenem HBr will depend on several factors,
including the following:

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successful completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable
foreign regulatory authority;

receipt of marketing approvals from applicable regulatory authorities;

establishment of arrangements with third-party manufacturers to obtain manufacturing supply in compliance with all regulatory
requirements;

obtainment and maintenance of patent, trade secret protection and regulatory exclusivity, both in the United States and internationally,
including our ability to maintain our license agreement with Meiji with respect to tebipenem HBr;

protection of our rights in our intellectual property portfolio;

launch of commercial sales of tebipenem HBr, if approved, whether alone or in collaboration with others;

acceptance of tebipenem HBr, if approved, by patients, the relevant medical communities and third-party payors;

competition with other therapies; 

establishment and maintenance of adequate health care coverage and reimbursement;

continued compliance with any post-marketing requirements imposed by applicable regulatory authorities, including any required post-
marketing clinical trials or the elements of any post-marketing Risk Evaluation and Mitigation Strategy, or REMS, that may be required
by the FDA or comparable requirements in other jurisdictions to ensure the benefits of tebipenem HBr outweigh its risks; and

a continued acceptable safety profile of tebipenem HBr following approval.

Successful development of tebipenem HBr for any additional indications would be subject to these same risks.

Many of these factors are beyond our control, including clinical development, the regulatory submission process, potential threats to our intellectual

property rights and the manufacturing, marketing and sales efforts of any future collaborator. If we are unable to develop, receive marketing approval for,
or successfully commercialize tebipenem HBr, or if we experience delays as a result of any of these factors or otherwise, our business could be materially
harmed. Even if we successfully obtain regulatory approvals to manufacture and market tebipenem HBr, our revenues will be dependent, in part, upon the
size of the markets in the territories for which we gain regulatory approval and have commercial rights. If the markets for patient subsets that we are
targeting are not as significant as we estimate, we may not generate significant revenues from sales of such product, if approved.

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We have no experience as a company in obtaining regulatory approval for a drug.

As a company, we have never obtained regulatory approval for, or commercialized, a drug. It is possible that the FDA may refuse to accept any or
all of our planned new drug applications, or NDAs, for substantive review or may conclude after review of our data that our application is insufficient to
obtain regulatory approval for any current or future product candidates. If the FDA does not approve any of our planned NDAs, it may require that we
conduct additional costly clinical, nonclinical or manufacturing validation studies before it will reconsider our applications. Depending on the extent of
these or any other FDA-required studies, approval of any NDA or other application that we submit may be significantly delayed, possibly for several years,
or may require us to expend more resources than we have available. Any failure or delay in obtaining regulatory approvals would prevent us from
commercializing tebipenem HBr or any of our other product candidates for which we may seek regulatory approval, generating revenues and achieving and
sustaining profitability. It is also possible that additional studies, if performed and completed, may not be considered sufficient by the FDA to approve any
NDA or other application that we submit. If any of these outcomes occur, we may be forced to abandon the development of our product candidates, which
would materially adversely affect our business and could potentially cause us to cease operations. We face similar risks for our applications in foreign
jurisdictions.

If clinical trials of product candidates that we advance to clinical trials fail to demonstrate safety and efficacy to the satisfaction of the FDA or
comparable foreign regulatory authorities or do not otherwise produce favorable results, we may incur additional costs or experience delays in
completing, or ultimately be unable to complete, the development and commercialization of such product candidates.

We may not commercialize, market, promote or sell any product candidate in the United States without obtaining marketing approval from the FDA

or in other countries without obtaining approvals from comparable foreign regulatory authorities, such as the European Medicines Agency, or EMA, and
we may never receive such approvals. We must complete extensive preclinical development and clinical trials to demonstrate the safety and efficacy of our
product candidates in humans before we will be able to obtain these approvals. Clinical testing is expensive, difficult to design and implement, can take
many years to complete and is inherently uncertain as to outcome. We have not previously submitted an NDA to the FDA or similar applications to
comparable foreign regulatory authorities for any of our product candidates.

The clinical development of tebipenem HBr, SPR720 and any of our other product candidates is susceptible to the risk of failure inherent at any
stage of drug development, including failure to demonstrate efficacy in a trial or across a broad population of patients, the occurrence of severe adverse
events, failure to comply with protocols or applicable regulatory requirements, and determination by the FDA or any comparable foreign regulatory
authority that a drug product is not approvable. A number of companies in the pharmaceutical industry, including biotechnology companies, have suffered
significant setbacks in clinical trials, even after promising results in earlier nonclinical studies or clinical trials. The results of preclinical and other
nonclinical studies and/or early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials. Notwithstanding
any promising results in early nonclinical studies or clinical trials, we cannot be certain that we will not face similar setbacks. For example, although
tebipenem HBr is a new formulation of the active pharmaceutical ingredient tebipenem that exhibited a favorable safety and efficacy profile during clinical
trials conducted by Meiji and a global pharmaceutical company, which we refer to as Global Pharma, in Japan, we may nonetheless fail to obtain regulatory
approval for tebipenem HBr for the treatment of cUTI based on the results of our recently completed Phase 3 clinical trial and those supporting foreign
data.

In addition, preclinical and clinical data are often susceptible to varying interpretations and analyses. Many companies that believed their product

candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval for the product candidates.
Even if we believe that the results of our clinical trials warrant marketing approval, the FDA or comparable foreign regulatory authorities may disagree and
may not grant marketing approval of our product candidates.

In some instances, there can be significant variability in safety and/or efficacy results between different trials of the same product candidate due to
numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type of the patient populations, adherence to the
dosing regimen and other trial protocols and the rate of dropout among clinical trial participants, among others. It is possible that even if one or more of our
product candidates has a beneficial effect, that effect will not be detected during clinical evaluation as a result of one of the factors listed or otherwise.
Conversely, as a result of the same factors, our clinical trials may indicate an apparent positive effect of a product candidate that is greater than the actual
positive effect, if any. Similarly, in our clinical trials, we may fail to detect toxicity of or intolerability of our product candidates or may determine that our
product candidates are toxic or not well tolerated when that is not in fact the case. In the case of our clinical trials, results may differ on the basis of the type
of bacteria with which patients are infected. We cannot make assurances that any clinical trials that we may conduct will demonstrate consistent or
adequate efficacy and safety to obtain regulatory approval to market our product candidates.

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We may encounter unforeseen events prior to, during, or as a result of, clinical trials that could delay or prevent us from obtaining regulatory

approval for tebipenem HBr or any of our other product candidates, including:

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the FDA or other comparable foreign regulatory authorities may disagree as to the design or implementation of our clinical trials;

we may be delayed in or fail to reach agreement on acceptable terms with prospective CROs and clinical trial sites, the terms of which can
be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

clinical trials of our product candidates may produce unfavorable or inconclusive results;

we may decide, or regulators may require us, to conduct additional clinical trials or abandon product development programs;

the number of patients required for clinical trials of our product candidates may be larger than we anticipate, enrollment in these clinical
trials may be slower than we anticipate, participants may drop out of these clinical trials at a higher rate than we anticipate or we may fail
to recruit suitable patients to participate in clinical trials;

our third-party contractors, including those manufacturing our product candidates or conducting clinical trials on our behalf, may fail to
comply with regulatory requirements or meet their contractual obligations to us in a timely manner, or at all;

the FDA or institutional review boards may not authorize us or our investigators to commence a clinical trial or conduct a clinical trial at a
prospective trial site;

regulators or institutional review boards may require that we or our investigators suspend or terminate clinical trials of our product
candidates for various reasons, including noncompliance with regulatory requirements or a finding that the participants are being exposed
to unacceptable health risks, undesirable side effects or other unexpected characteristics of the product candidate;

the FDA or comparable foreign regulatory authorities may fail to approve the manufacturing processes or facilities of third-party
manufacturers with which we enter into agreements for clinical and commercial supplies;

the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be
insufficient or inadequate; and

the approval policies or regulations of the FDA or comparable foreign regulatory authorities may significantly change in a manner
rendering our clinical data insufficient for approval.

We could also encounter delays if a clinical trial is suspended or terminated by us, by the institutional review boards, or IRBs, of the institutions in
which such trials are being conducted, by the Data Safety Monitoring Board, or DSMB, if any, for such trial or by the FDA or other regulatory authorities.
Such authorities may suspend or terminate a clinical trial due to a number of factors, including failure to conduct the clinical trial in accordance with
regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting
in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug or changes in
governmental regulations or administrative actions. On February 5, 2021, we announced that the FDA informed us that a clinical hold had been placed on
our Phase 2a clinical trial of SPR720 following mortality events in a non-human primate toxicology study.

If we are required to conduct additional clinical trials or other testing of tebipenem HBr, SPR720 or any other product candidate beyond the trials
and testing that we contemplate, if we are unable to successfully complete clinical trials or other testing of our product candidates, if the results of these
trials or tests are unfavorable or are only modestly favorable or if there are safety concerns associated with tebipenem HBr or any other product candidate,
we may:

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incur additional unplanned costs;

be delayed in obtaining marketing approval for our product candidates;

not obtain marketing approval at all;

obtain approval for indications or patient populations that are not as broad as intended or desired;

obtain approval with labeling that includes significant use or distribution restrictions or significant safety warnings, including boxed
warnings;

be subject to additional post-marketing testing or other requirements; or

be required to remove the product from the market after obtaining marketing approval.

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Our failure to successfully initiate and complete clinical trials of our product candidates and to demonstrate the efficacy and safety necessary to

obtain regulatory approval to market any of our product candidates would significantly harm our business. Our product candidate development costs will
also increase if we experience delays in testing or marketing approvals and we may be required to obtain additional funds to complete clinical trials. We
cannot make assurances that our clinical trials will begin as planned or be completed on schedule, if at all, or that we will not need to restructure our trials
after they have begun. Significant clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize our
product candidates or allow our competitors to bring products to market before we do and impair our ability to successfully commercialize our product
candidates, which may harm our business and results of operations. In addition, many of the factors that cause, or lead to, delays of clinical trials may
ultimately lead to the denial of regulatory approval of tebipenem HBr or any other product candidate.

If we experience delays or difficulties in the enrollment of patients in clinical trials, clinical development activities could be delayed or otherwise
adversely affected.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number
of patients who remain in the study until its conclusion. We may not be able to initiate, continue or complete clinical trials of our product candidates if we
are unable to locate and enroll a sufficient number of eligible patients to participate in clinical trials as required by the FDA or comparable foreign
regulatory authorities, such as the EMA. Patient enrollment is a significant factor in the timing of clinical trials, and is affected by many factors, including:

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the size and nature of the target patient population;

the severity of the disease under investigation;

the proximity of patients to clinical sites;

the patient eligibility criteria for participation in the clinical trial;

the design of the clinical trial;

our ability to recruit clinical trial investigators with appropriate competencies and experience;

competing clinical trials and clinicians’ and patients’ perceptions as to the potential advantages and risks of the product candidate being
studied in relation to other available therapies, including any new drugs that may be approved for the indications that we are investigating;

our ability to obtain and maintain patient consents; and

the risk that patients enrolled in clinical trials will drop out of the trials before completion.

Our inability to enroll a sufficient number of patients for our clinical trials would result in significant delays or might require us to abandon one or
more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs for our product candidates, slow down or
halt our product candidate development and approval process and jeopardize our ability to seek and obtain the marketing approval required to commence
product sales and generate revenue, which would cause the value of our company to decline and limit our ability to obtain additional financing if needed.

To support our accelerated clinical development strategy for tebipenem HBr, we are relying, in part, on clinical data from two exploratory Phase 2
clinical trials conducted by Meiji (ME1211) and Global Pharma (L-084 04) in Japan, which were not conducted in accordance with FDA guidance for
clinical trials in patients with cUTI. To the extent that these clinical trial design differences limit our use of the clinical data, our proposed clinical trial
plan for tebipenem HBr with the FDA could be materially delayed and we may incur material additional costs.

There are significant differences in the trial design for the two exploratory Phase 2 clinical trials conducted by Meiji and its partner in Japan

compared to the clinical trial design described by the FDA in its guidance for clinical trials in patients with cUTI, including:

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The studies were not randomized and were open-label and had no comparator arm. Treatment assignments were made by the
investigators;

The inclusion criteria specified complicated UTI as an entry criterion, but other than retained residual volume (100 ml) there were no
other criteria defining “complicated” UTI;

While L-084 04 excluded patients who received prior antibiotics and who had no clinical response, there were no parameters or limits for
inclusion (e.g., less than 24 hours of a potentially effective antibiotic or number of doses). ME1211 did not specifically mention prior
antibiotic use;

While urine cultures were obtained at baseline, these were not quantitative, and there was no minimum requirement for bacterial load for
entry;

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While microbiological outcome was assessed, the definitions did not include a minimum reduction in bacterial counts (i.e., a reduction to
less than 104 cfu/ml);

Clinical outcomes were global assessments by the investigators and did not specifically mention the resolution of baseline signs and
symptoms; and

The primary endpoint was not a composite of both clinical and microbiological outcomes.

To the extent that these clinical trial design differences limit our use of the clinical data, our proposed clinical trial plan for tebipenem HBr with the

FDA could be materially delayed and we may incur material additional costs.

Preliminary or interim data from our clinical studies that we announce or publish from time to time may change as more patient data become available
and are subject to audit and verification procedures that could result in material changes in the final data.

We currently have no products approved for sale and we cannot guarantee that we will ever have marketable products. Clinical failure can occur at

any stage of clinical development. Clinical trials may produce negative or inconclusive results, and we or any future collaborators may decide, or regulators
may require us, to conduct additional clinical trials or preclinical studies. We will be required to demonstrate with substantial evidence through well-
controlled clinical trials that our product candidates are safe and effective for use in a diverse population before we can seek marketing approvals for their
commercial sale. Success in preclinical studies and early-stage clinical trials does not mean that future larger registration clinical trials will be successful.
This is because product candidates in later-stage clinical trials may fail to demonstrate sufficient safety and efficacy to the satisfaction of the FDA and
comparable foreign regulatory authorities despite having progressed through preclinical studies and early-stage clinical trials.

Preliminary or interim data from our clinical studies are not necessarily predictive of final data. Preliminary and interim data are subject to the risk

that one or more of the clinical outcomes may materially change, as more patient data become available and we issue our final clinical study report.
Preliminary or interim data also remain subject to audit and verification procedures that may result in the final data being materially different from the
preliminary data we previously published. As a result, interim and preliminary data should be viewed with caution until the final data are available.
Adverse differences between preliminary or interim data and final data could affect our planned clinical path for tebipenem HBr, SPR720 or other product
candidates we advance into clinical trials, including potentially increasing cost and/or causing delay in such development.

In some instances, there can be significant variability in safety and efficacy results between different clinical trials of the same product candidate due

to numerous factors, including changes in trial protocols, differences in size and type of the patient populations, differences in and adherence to the dosing
regimen and other trial protocols and the rate of dropout among clinical trial participants. We therefore do not know whether any clinical trials we may
conduct will demonstrate consistent or adequate efficacy and safety sufficient to obtain marketing approval to market our product candidates.

Serious adverse events or undesirable side effects or other unexpected properties of tebipenem HBr or any other product candidate may be identified
during development or after approval that could delay, prevent or cause the withdrawal of regulatory approval, limit the commercial potential, or result
in significant negative consequences following marketing approval.

Serious adverse events or undesirable side effects caused by, or other unexpected properties of, our product candidates could cause us, an

institutional review board, or regulatory authorities to interrupt, delay or halt our clinical trials and could result in a more restrictive label, the imposition of
distribution or use restrictions or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. If tebipenem HBr or
any of our other product candidates is associated with serious or unexpected adverse events or undesirable side effects, the FDA, the IRBs at the institutions
in which our studies are conducted, or a DSMB, could suspend or terminate our clinical trials or the FDA or comparable foreign regulatory authorities
could order us to cease clinical trials or deny approval of our product candidates for any or all targeted indications. Treatment-related side effects could also
affect patient recruitment or the ability of enrolled patients to complete the trial or result in potential product liability claims. Any of these occurrences may
harm our business, financial condition and prospects significantly.

To date, patients treated with the active ingredient in tebipenem HBr have experienced drug-related side effects including diarrhea, temporary

increases in hepatic enzymes, allergic reactions, rashes and convulsions. To date, tebipenem HBr has generally been well tolerated in clinical trials, and
there have been no reports of serious adverse events related to tebipenem HBr, but additional adverse events may emerge in any subsequent clinical trials.

If unexpected adverse events occur in any of our ongoing or planned clinical trials, we may need to abandon development of our product candidates,

or limit development to lower doses or to certain uses or subpopulations in which the undesirable side effects or other unfavorable characteristics are less
prevalent, less severe or more acceptable from a risk-benefit perspective. Many compounds that initially showed promise in clinical or earlier stage testing
are later found to cause undesirable or unexpected side effects that prevented further development of the compound.

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Undesirable side effects or other unexpected adverse events or properties of tebipenem HBr or any of our other product candidates could arise or
become known either during clinical development or, if approved, after the approved product has been marketed. If such an event occurs during development,
our trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to cease further development of, or could
deny approval of, tebipenem HBr or our other product candidates. If such an event occurs after such product candidates are approved, a number of potentially
significant negative consequences may result, including:

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regulatory authorities may withdraw or limit their approval of such product;

we may decide to or be required to recall a product or change the way such product is administered to patients;

regulatory authorities may require additional warnings on the label, such as a “black box” warning or a contraindication, or impose
distribution or use restrictions;

regulatory authorities may require one or more post-market studies to monitor the safety and efficacy of the product;

we may be required to implement a Risk Evaluation and Mitigation Strategy, or REMS, including the creation of a medication guide
outlining the risks of such side effects for distribution to patients;

we could be sued and held liable for harm caused to patients exposed to or taking our product candidates;

our product may become less competitive; and

our reputation may suffer.

We believe that any of these events could prevent us from achieving or maintaining market acceptance of the affected product candidate, if
approved, or could substantially increase commercialization costs and expenses, which could delay or prevent us from generating revenue from the sale of
our products and harm our business and results of operations.

Even if a product candidate does obtain regulatory approval, it may never achieve the market acceptance by physicians, patients, hospitals, third-party
payors and others in the medical community that is necessary for commercial success and the market opportunity may be smaller than we estimate.

Even if we obtain FDA or other regulatory approvals and are able to launch tebipenem HBr or any other product candidate commercially, the
approved product candidate may nonetheless fail to gain sufficient market acceptance among physicians, patients, hospitals (including pharmacy directors)
and third-party payors and, ultimately, may not be commercially successful. For example, physicians are often reluctant to switch their patients from
existing therapies even when new and potentially more effective or convenient treatments enter the market. Further, patients often acclimate to the therapy
that they are currently taking and do not want to switch unless their physicians recommend switching products or they are required to switch therapies due
to lack of coverage and reimbursement for existing therapies. If an approved product candidate does not achieve an adequate level of acceptance, we may
not generate significant product revenues or any profits from operations. The degree of market acceptance of any product candidate for which we receive
approval depends on a number of factors, including:

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the efficacy and safety of the product candidate as demonstrated in clinical trials;

relative convenience and ease of administration;

the clinical indications for which the product candidate is approved;

the potential and perceived advantages and disadvantages of the product candidates, including cost and clinical benefit relative to
alternative treatments;

the willingness of physicians to prescribe the product and of the target patient population to try new therapies;

the willingness of hospital pharmacy directors to purchase the product for their formularies;

acceptance by physicians, patients, operators of hospitals and treatment facilities and parties responsible for coverage and reimbursement
of the product;

the availability of coverage and adequate reimbursement by third-party payors and government authorities;

the effectiveness of our sales and marketing efforts;

the strength of marketing and distribution support;

limitations or warnings, including distribution or use restrictions, contained in the product’s approved labeling or an approved risk
evaluation and mitigation strategy;

whether the product is designated under physician treatment guidelines as a first-line therapy or as a second- or third-line therapy for
particular infections;

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the approval of other new products for the same indications;

the timing of market introduction of the approved product as well as competitive products;

adverse publicity about the product or favorable publicity about competitive products;

the emergence of bacterial resistance to the product; and

the rate at which resistance to other drugs in the target infections grows.

Any failure by tebipenem HBr or any other product candidate that obtains regulatory approval to achieve market acceptance or commercial success

would adversely affect our business prospects.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications
that may be more profitable or for which there is a greater likelihood of success.

Because we have limited financial and managerial resources, we intend to focus on developing product candidates for specific indications that we

identify as most likely to succeed, in terms of both their potential for marketing approval and commercialization. As a result, we may forego or delay
pursuit of opportunities with other product candidates or for other indications that may prove to have greater commercial potential.

Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities. Our spending

on current and future research and development programs and product candidates for specific indications may not yield any commercially viable product
candidates. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights
to that product candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to
retain sole development and commercialization rights to the product candidate.

If we are unable to establish sales, marketing and distribution capabilities or enter into sales, marketing and distribution agreements with third parties,
we may not be successful in commercializing tebipenem HBr or any other product candidate if such product candidate is approved.

We do not have a sales, marketing or distribution infrastructure and we have no experience in the sale, marketing or distribution of pharmaceutical

products. To achieve commercial success for any approved product, we must either develop a sales and marketing organization or outsource those functions
to third parties. We intend to build a commercial organization in the United States and recruit experienced sales, marketing and distribution professionals.
The development of sales, marketing and distribution capabilities will require substantial resources, will be time-consuming and could delay any product
launch. If the commercial launch of a product candidate for which we recruit a sales force and establish marketing and distribution capabilities is delayed or
does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization costs. This may be costly, and our investment
would be lost if we cannot retain or reposition our sales and marketing personnel. In addition, we may not be able to hire a sales force in the United States
that is sufficient in size or has adequate expertise in the medical markets that we intend to target. If we are unable to establish a sales force and marketing
and distribution capabilities, our operating results may be adversely affected.

Factors that may inhibit our efforts to commercialize our products on our own include:

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our inability to recruit and retain adequate numbers of effective sales and marketing personnel;

the inability of sales personnel to obtain access to or persuade adequate numbers of physicians to prescribe any future products;

the lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to
companies with more extensive product lines; and

unforeseen costs and expenses associated with creating an independent sales and marketing organization.

We intend to use collaborators to assist with the commercialization of tebipenem HBr and any other product candidate outside the United States. As

a result of entering into arrangements with third parties to perform sales, marketing and distribution services, our product revenues or the profitability of
these product revenues to us would likely be lower than if we were to directly market and sell products in those markets. Furthermore, we may be
unsuccessful in entering into the necessary arrangements with third parties or may be unable to do so on terms that are favorable to us. In addition, we
likely would have little control over such third parties, and any of them might fail to devote the necessary resources and attention to sell and market our
products effectively.

If we do not establish sales and marketing capabilities successfully, either on our own or in collaboration with third parties, we will not be successful

in commercializing our product candidates.

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We face substantial competition from other pharmaceutical and biotechnology companies and our operating results may suffer if we fail to compete
effectively.

The development and commercialization of new drug products is highly competitive. We face competition from major pharmaceutical companies,

specialty pharmaceutical companies and biotechnology companies worldwide with respect to tebipenem HBr and our other product candidates that we may
seek to develop and commercialize in the future. There are a number of large pharmaceutical and biotechnology companies that currently market and sell
products or are pursuing the development of product candidates for the treatment of resistant infections. Potential competitors also include academic
institutions, government agencies and other public and private research organizations. Our competitors may succeed in developing, acquiring or licensing
technologies and drug products that are more effective or less costly than tebipenem HBr or any other product candidates that we are currently developing
or that we may develop, which could render our product candidates obsolete and noncompetitive.

There are a variety of available oral therapies marketed for the treatment urinary tract infections that we would expect would compete with
tebipenem HBr, such as Levaquin, Cipro and Bactrim. Many of the available therapies are well established and widely accepted by physicians, patients and
third-party payors. Insurers and other third-party payors may also encourage the use of generic products, for example in the fluoroquinolone class.
However, the susceptibility of urinary tract pathogens to the existing treatment alternatives is waning. If tebipenem HBr is approved, the pricing may be at
a significant premium over other competitive products. This may make it difficult for tebipenem HBr to compete with these products.

There are also a number of oral product candidates in clinical development by third parties that are intended to treat UTIs. Some mid- to late-stage

product candidates include ceftibuten/clavulanate, or C-Scape, from Cipla Therapeutics, Inc., and sulopenem from Iterum Therapeutics Limited. If our
competitors obtain marketing approval from the FDA or comparable foreign regulatory authorities for their product candidates more rapidly than us, it
could result in our competitors establishing a strong market position before we are able to enter the market.

There are several IV-administered products marketed for the treatment of infections resistant to first-line therapy for Gram-negative infections,

including ceftazidime-avibactam, or Avycaz, from Allergan plc and Pfizer Inc., ceftolozane-tazobactam, or Zerbaxa, from Merck & Co.,
imipenem/cilastatin and relebactam, or Recarbrio, from Merck & Co., plazomicin, or Zemdri, from Cipla Therapeutics, Inc., cefiderocol, or Fetroja, from
Shionogi & Co. Ltd., eravacycline, or Xerava, from Tetraphase Pharmaceuticals, Inc. and meropenem-vaborbactam, or Vabomere, from Melinta
Therapeutics, Inc.

Many of our competitors have significantly greater financial resources and expertise in research and development, manufacturing, preclinical

testing, conducting clinical trials, obtaining regulatory approvals and marketing approved products than we do. Mergers and acquisitions in the
pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller
and other early stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established
companies. These third parties compete with us in recruiting and retaining qualified scientific and management personnel, establishing clinical trial sites
and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs.

In July 2012, the Food and Drug Administration Safety and Innovation Act was passed, which included the Generating Antibiotics Incentives Now

Act, or the GAIN Act. The GAIN Act is intended to provide incentives for the development of new, qualified infectious disease products. In December
2016, the Cures Act was passed, providing additional support for the development of new infectious disease products. These incentives may result in more
competition in the market for new antibiotics, and may cause pharmaceutical and biotechnology companies with more resources than we have to shift their
efforts towards the development of product candidates that could be competitive with tebipenem HBr and our other product candidates.

Even if we are able to commercialize tebipenem HBr or any other product candidate, the product may become subject to unfavorable pricing
regulations, or third-party payor coverage and reimbursement policies that could harm our business.

Marketing approvals, pricing, coverage and reimbursement for new drug products vary widely from country to country. Some countries require
approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing
approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial
approval is granted. As a result, we might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay
our commercial launch of the product, possibly for lengthy time periods, which may negatively affect the revenues that we are able to generate from the
sale of the product in that country. Adverse pricing limitations may hinder our ability to recoup our investment in one or more product candidates, even if
our product candidates obtain marketing approval.

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We currently expect that some of our product candidates, if approved, will be administered in a hospital inpatient setting. In the United States,
governmental and other third-party payors generally reimburse hospitals a single bundled payment established on a prospective basis intended to cover all
items and services provided to the patient during a single hospitalization. Hospitals bill third-party payors for all or a portion of the fees associated with the
patient’s hospitalization and bill patients for any deductibles or co-payments. Because there is typically no separate reimbursement for drugs administered
in a hospital inpatient setting, some of our target customers may be unwilling to adopt our product candidates in light of the additional associated cost. If
we are forced to lower the price we charge for our product candidates, if approved, our gross margins may decrease, which would adversely affect our
ability to invest in and grow our business.

To the extent tebipenem HBr or any other product candidate we develop is used in an outpatient setting, the commercial success of our product
candidates will depend substantially, both domestically and abroad, on the extent to which coverage and reimbursement for these products and related
treatments are available from government health programs and third-party payors. If coverage is not available, or reimbursement is limited, we may not be
able to successfully commercialize our product candidates. Even if coverage is provided, the approved reimbursement amount may not be high enough to
allow us to establish or maintain pricing sufficient to realize a sufficient return on our investments. Government authorities and third-party payors, such as
health insurers and managed care organizations, publish formularies that identify the medications they will cover and the related payment levels. The
healthcare industry is focused on cost containment, both in the United States and elsewhere. Government authorities and third-party payors have attempted
to control costs by limiting coverage and the amount of reimbursement for particular medications, which could affect our ability to sell our product
candidates profitably.

Increasingly, third-party payors are requiring higher levels of evidence of the benefits and clinical outcomes of new technologies and are challenging

the prices charged. We cannot be sure that coverage will be available for tebipenem HBr or any other product candidate that we commercialize and, if
available, that the reimbursement rates will be adequate. Further, the net reimbursement for outpatient drug products may be subject to additional
reductions if there are changes to laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the United
States. An inability to promptly obtain coverage and adequate payment rates from both government-funded and private payors for any approved products
used on an outpatient basis that we develop could have a material adverse effect on our operating results, our ability to raise capital needed to
commercialize products and our overall financial condition.

We cannot predict whether bacteria may develop resistance to tebipenem HBr or our other product candidates, which could affect their revenue
potential.

We are developing tebipenem HBr and certain of our other product candidates to treat drug-resistant bacterial infections. The bacteria responsible

for these infections evolve quickly and readily transfer their resistance mechanisms within and between species. We cannot predict whether or when
bacterial resistance to tebipenem HBr or any of such other product candidates may develop.

As a carbapenem, tebipenem HBr is not active against organisms expressing a resistance mechanism mediated by enzymes known as

carbapenemases. Although occurrence of this resistance mechanism is currently rare, we cannot predict whether carbapenemase-mediated resistance will
become widespread in regions where we intend to market tebipenem HBr if it is approved. The growth of drug resistant infections in community settings or
in countries with poor public health infrastructures, or the potential use of tebipenem HBr or any of our other product candidates outside of controlled
hospital settings, could contribute to the rise of resistance. If resistance to tebipenem HBr or any of our other product candidates becomes prevalent, our
ability to generate revenue from tebipenem HBr or such product candidates could suffer.

If we are not successful in discovering, developing and commercializing additional product candidates, our ability to expand our business and achieve
our strategic objectives would be impaired.

Although a substantial amount of our efforts will focus on our ongoing and planned clinical trials and potential approval of our lead product

candidate, tebipenem HBr, SPR720 and our Potentiator product candidate, SPR206, a key element of our strategy is to discover, develop and
commercialize a portfolio of therapeutics to treat drug resistant bacterial infections. We are seeking to do so through our internal research programs and are
exploring, and intend to explore in the future, strategic partnerships for the development of new product candidates.

Research programs to identify product candidates require substantial technical, financial and human resources, whether or not any product
candidates are ultimately identified. Our research programs may initially show promise in identifying potential product candidates, yet fail to yield product
candidates for clinical development for many reasons, including the following:

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the research methodology used may not be successful in identifying potential product candidates;

we may be unable to successfully modify candidate compounds to be active in Gram-negative bacteria or defeat bacterial resistance
mechanisms or identify viable product candidates in our screening campaigns;

competitors may develop alternatives that render our product candidates obsolete;

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product candidates that we develop may nevertheless be covered by third parties’ patents or other exclusive rights;

a product candidate may, on further study, be shown to have harmful side effects or other characteristics that indicate it is unlikely to be
effective or otherwise does not meet applicable regulatory criteria;

a product candidate may not be capable of being produced in commercial quantities at an acceptable cost, or at all;

a product candidate may not be accepted as safe and effective by patients, the medical community or third-party payors; and

the development of bacterial resistance to potential product candidates may render them ineffective against target infections.

If we are unsuccessful in identifying and developing additional product candidates, our potential for growth may be impaired.

Product liability lawsuits against us could divert our resources, cause us to incur substantial liabilities and limit commercialization of any products that
we may develop.

We face an inherent risk of product liability claims as a result of the clinical testing of our product candidates despite obtaining appropriate informed
consents from our clinical trial participants. We will face an even greater risk if we obtain marketing approval for and commercially sell tebipenem HBr or
any other product candidate. For example, we may be sued if any product that we develop allegedly causes injury or is found to be otherwise unsuitable
during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in
design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state
consumer protection acts. If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to
limit commercialization of our product candidates. Regardless of the merits or eventual outcome, liability claims may result in:

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reduced resources for our management to pursue our business strategy;

decreased demand for our product candidates or products that we may develop;

injury to our reputation and significant negative media attention;

withdrawal of clinical trial participants;

initiation of investigations by regulators;

product recalls, withdrawals or labeling, marketing or promotional restrictions;

significant costs to defend resulting litigation;

substantial monetary awards to trial participants or patients;

loss of revenue; and

the inability to commercialize any products that we may develop.

Although we maintain general liability insurance and clinical trial liability insurance, this insurance may not fully cover potential liabilities that we
may incur. The cost of any product liability litigation or other proceeding, even if resolved in our favor, could be substantial. We will need to increase our
insurance coverage if and when we receive marketing approval for and begin selling tebipenem HBr or any other product candidate. In addition, insurance
coverage is becoming increasingly expensive. If we are unable to obtain or maintain sufficient insurance coverage at an acceptable cost or to otherwise
protect against potential product liability claims, it could prevent or inhibit the development and commercial production and sale of our product candidates,
which could adversely affect our business, financial condition, results of operations and prospects.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could
have a material adverse effect on our business.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the
handling, use, storage, treatment and disposal of hazardous materials and wastes. From time to time and in the future, our operations may involve the use of
hazardous and flammable materials, including chemicals and biological materials, and may also produce hazardous waste products. Even if we contract
with third parties for the disposal of these materials and wastes, we cannot completely eliminate the risk of contamination or injury resulting from these
materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable for any resulting damages, and any
liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties for failure to comply with
such laws and regulations.

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We maintain workers’ compensation insurance to cover us for costs and expenses that we may incur due to injuries to our employees resulting from

the use of hazardous materials, but this insurance may not provide adequate coverage against potential liabilities. Moreover, we do not currently maintain
insurance for environmental liability or toxic tort claims that may be asserted against us.

In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations,
including public health measures in place due to the ongoing COVID-19 pandemic. Current or future environmental laws and regulations may impair our
research, development or production efforts, which could adversely affect our business, financial condition, results of operations or prospects. In addition,
failure to comply with these laws and regulations may result in substantial fines, penalties or other sanctions.

Our internal computer systems, or those of our contract research organizations or other contractors or consultants, may fail or suffer security
breaches, which could result in a material disruption of our product development programs, and could subject us to liability.

We utilize information technology systems and networks to process, transmit and store electronic information in connection with our business

activities. As the use of digital technologies has increased, cyber incidents, including deliberate attacks and attempts to gain unauthorized access to
computer systems and networks, have increased in frequency and sophistication. These threats pose a risk to the security of our systems and networks and
the confidentiality, availability and integrity of our data. There can be no assurance that we will be successful in preventing cyber-attacks or successfully
mitigating their effects.

Despite the implementation of security measures, our internal computer systems and those of our contract research organizations and other
contractors and consultants are vulnerable to damage or disruption from hacking, computer viruses, software bugs, unauthorized access, natural disasters,
terrorism, war, and telecommunication, equipment and electrical failures. While we have not, to our knowledge, experienced any significant system failure,
accident or security breach to date, if such an event were to occur and cause interruptions in our operations or the operations of those third parties with
which we contract, it could result in a material disruption of our programs and our business operations. For example, the loss of clinical trial data from
completed or ongoing clinical trials for any of our product candidates could result in delays in our development and regulatory approval efforts and
significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach results in a loss of or damage to our
data or applications, or inappropriate disclosure or theft of confidential or proprietary information, we could incur liability, the further development of our
product candidates could be delayed or our competitive position could be compromised.

Any such disruption or security breach, as well as any action by us or our employees or contractors that might be inconsistent with the rapidly
evolving data privacy and security laws and regulations applicable within the United States and elsewhere where we conduct business, could result in
enforcement actions by the United States, the United States Federal government or foreign governments, liability or sanctions under data privacy laws that
protect personally identifiable information, regulatory penalties, other legal proceedings such as but not limited to private litigation, the incurrence of
significant remediation costs, disruptions to our development programs, business operations and collaborations, diversion of management efforts and
damage to our reputation, which could harm our business and operations. Because of the rapidly moving nature of technology and the increasing
sophistication of cybersecurity threats, our measures to prevent, respond to and minimize such risks may be unsuccessful.

In addition, the European Parliament and the Council of the European Union adopted a comprehensive general data privacy regulation, or GDPR, in

2016 to replace the current European Union Data Protection Directive and related country-specific legislation. The GDPR took effect in May 2018 and
governs the collection and use of personal data in the European Union. The GDPR, which is wide-ranging in scope, will impose several requirements
relating to the consent of the individuals to whom the personal data relates, the information provided to the individuals, the security and confidentiality of
the personal data, data breach notification and the use of third party processors in connection with the processing of the personal data. The GDPR also
imposes strict rules on the transfer of personal data out of the European Union to the United States, enhances enforcement authority and imposes large
penalties for noncompliance, including the potential for fines of up to €20 million or 4% of the annual global revenues of the infringer, whichever is
greater.

The GDPR also confers a private right of action on data subjects and consumer associations to lodge complaints with supervisory authorities, seek
judicial remedies, and obtain compensation for damages resulting from violations of the GDPR. Compliance with the GDPR has been and will continue to
be a rigorous and time-intensive process that has increased and will continue to increase our cost of doing business or require us to change our business
practices, and despite those efforts, there is a risk that we or our collaborators may be subject to fines and penalties, litigation and reputational harm in
connection with any European activities, which could adversely affect our business, prospects, financial condition and results of operations.

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In addition, in June 2018, California enacted the California Consumer Privacy Act, or CCPA, which takes effect on January 1, 2020. The CCPA

gives California residents expanded rights to access and require deletion of their personal information, opt out of certain personal information sharing, and
receive detailed information about how their personal information is used. The CCPA provides for civil penalties for violations, as well as a private right of
action for data breaches that may increase data breach litigation. Although the CCPA includes exemptions for certain clinical trials data, and HIPAA
protected health information, the law may increase our compliance costs and potential liability with respect to other personal information we collect about
California residents. The CCPA has prompted a number of proposals for new federal and state privacy legislation that, if passed, could increase our
potential liability, increase our compliance costs and adversely affect our business.

We or third parties upon whom we depend may be adversely affected by natural disasters and/or health epidemics, and our business, financial condition
and results of operations could be adversely affected.

Natural disasters could severely disrupt our operations and have a material adverse effect on our business operations. If a natural disaster, health

epidemic, such as COVID-19, or other event beyond our control occurred that prevented us from using all or a significant portion of our office and/or lab
spaces, that damaged critical infrastructure, such as the manufacturing facilities of our third-party contract manufacturers, or that otherwise disrupted
operations, it may be difficult for us to continue our business for a substantial period of time.

Risks Related to Our Dependence on Third Parties

We expect to depend on collaborations with third parties for the development and commercialization of some of our product candidates. Our prospects
with respect to those product candidates will depend in part on the success of those collaborations.

Although we expect to commercialize tebipenem HBr ourselves in the United States, we intend to commercialize it outside the United States
through collaboration arrangements. In addition, we may seek third-party collaborators for development and commercialization of certain of our product
candidates. For instance, in January 2019, we entered into a license agreement with Everest, which was amended and restated in January 2021, whereby we
granted Everest an exclusive license to develop, manufacture and commercialize SPR206, or products containing SPR206, in Greater China, South Korea
and certain Southeast Asian countries. Additionally, in June 2019, we entered into a collaboration agreement with the Bill and Melinda Gates Medical
Research Institute, or the Gates MRI, to develop SPR720 for the treatment of lung infections caused by Mycobacterium tuberculosis. Our likely
collaborators for any other marketing, distribution, development, licensing or broader collaboration arrangements we may pursue include large and mid-
size pharmaceutical companies, regional and national pharmaceutical companies and biotechnology companies.

We may derive revenue from research and development fees, license fees, milestone payments and royalties under any collaborative arrangement

into which we enter. Our ability to generate revenue from these arrangements will depend on our collaborators’ abilities to successfully perform the
functions assigned to them in these arrangements. In addition, our collaborators may have the right to abandon research or development projects and
terminate applicable agreements, including funding obligations, prior to or upon the expiration of the agreed upon terms. As a result, we can expect to
relinquish some or all of the control over the future success of a product candidate that we license to a third party.

We face significant competition in seeking and obtaining appropriate collaborators. Collaborations involving our product candidates may pose a

number of risks, including the following:

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collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations;

collaborators may not perform their obligations as expected;

collaborators may not pursue development and commercialization of our product candidates or may elect not to continue or renew
development or commercialization programs based on clinical trial results, changes in the collaborators’ strategic focus or available
funding or external factors, such as an acquisition, that divert resources or create competing priorities;

collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product
candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing;

product candidates discovered in collaboration with us may be viewed by our collaborators as competitive with their own product
candidates or products, which may cause collaborators to cease to devote resources to the commercialization of our product candidates;

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a collaborator with marketing and distribution rights to one or more products may not commit sufficient resources to the marketing and
distribution of such product or products;

disagreements with collaborators, including disagreements over proprietary rights, contract interpretation or the preferred course of
development, might cause delays or termination of the research, development or commercialization of product candidates, might lead to
additional responsibilities for us with respect to product candidates, or might result in litigation or arbitration, any of which would be
time-consuming and expensive;

collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information in such a way as
to invite litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential
litigation;

collaborators may infringe the intellectual property rights of third parties, which may expose us to litigation and potential liability; and

collaborations may be terminated and, if terminated, may result in a need for additional capital to pursue further development or
commercialization of the applicable product candidates.

Collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all. If a

collaborator of ours is involved in a business combination, it could decide to delay, diminish or terminate the development or commercialization of any
product candidate licensed to it by us.

We may have to alter our development and commercialization plans if we are not able to establish collaborations.

We will require additional funds to complete the development and potential commercialization of tebipenem HBr and our other product candidates.

For some of our product candidates, we may decide to collaborate with pharmaceutical and biotechnology companies for the development and potential
commercialization of those product candidates. Moreover, we intend to utilize a variety of types of collaboration arrangements for the potential
commercialization of our product candidates outside the United States. Whether we reach a definitive agreement for a collaboration will depend, among
other things, upon our assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed
collaborator’s evaluation of a number of factors. Those factors may include:

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the design or results of clinical trials;

the likelihood of approval by the FDA or comparable foreign regulatory authorities;

the potential market for the subject product candidate;

the costs and complexities of manufacturing and delivering such product candidate to patients;

the potential for competing products;

our patent position protecting the product candidate, including any uncertainty with respect to our ownership of our technology or our
licensor’s ownership of technology we license from them, which can exist if there is a challenge to such ownership without regard to the
merits of the challenge;

the need to seek licenses or sub-licenses to third-party intellectual property; and

industry and market conditions generally.

The collaborator may also consider alternative product candidates or technologies for similar indications that may be available for collaboration and

whether such a collaboration could be more attractive than the one with us for our product candidate. We may also be restricted under future license
agreements from entering into agreements on certain terms with potential collaborators. In addition, there have been a significant number of recent business
combinations among large pharmaceutical companies that have resulted in a reduced number of potential future collaborators.

If we are unable to reach agreements with suitable collaborators on a timely basis, on acceptable terms, or at all, we may have to curtail the

development of a product candidate, reduce or delay its development program or one or more of our other development programs, delay its potential
commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or commercialization
activities at our own expense. If we elect to fund and undertake development or commercialization activities on our own, we may need to obtain additional
expertise and additional capital, which may not be available to us on acceptable terms or at all. If we fail to enter into collaborations and do not have
sufficient funds or expertise to undertake the necessary development and commercialization activities, we may not be able to further develop our product
candidates or bring them to market and our business may be materially and adversely affected.

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We rely on third parties to conduct all of our preclinical studies and all of our clinical trials. If these third parties do not successfully carry out their
contractual duties or meet expected deadlines, we may be unable to obtain regulatory approval for or commercialize any of our product candidates. If
they do not perform satisfactorily, our business may be materially harmed.

We do not independently conduct nonclinical studies that comply with GLP requirements. We also do not have the ability to independently conduct

clinical trials of any of our product candidates. We rely on third parties, such as contract research organizations, clinical data management organizations,
medical institutions and clinical investigators, to conduct our clinical trials of tebipenem HBr, SPR720 or our other product candidates and expect to rely on
these third parties to conduct clinical trials of our other product candidates and potential product candidates. Any of these third parties may terminate their
engagements with us at any time. If we need to enter into alternative arrangements, it would delay our product development activities and increase our
costs.

Our reliance on these third parties for clinical development activities limits our control over these activities but we remain responsible for ensuring

that each of our studies is conducted in accordance with the applicable protocol, legal, regulatory and scientific standards. For example, notwithstanding the
obligations of a contract research organization for a trial of one of our product candidates, we remain responsible for ensuring that each of our clinical trials
is conducted in accordance with the general investigational plan and protocols for the trial and applicable regulatory requirements. While we will have
agreements governing their activities, we control only certain aspects of their activities and have limited influence over their actual performance. The third
parties with whom we contract for execution of our GLP studies and our clinical trials play a significant role in the conduct of these studies and trials and
the subsequent collection and analysis of data. Although we rely on these third parties to conduct our GLP-compliant nonclinical studies and clinical trials,
we remain responsible for ensuring that each of our nonclinical studies and clinical trials are conducted in accordance with applicable laws and regulations,
and our reliance on the CROs does not relieve us of our regulatory responsibilities. The FDA and regulatory authorities in other jurisdictions also require us
to comply with standards, commonly referred to as good clinical practices, or GCPs, for conducting, monitoring, recording and reporting the results of
clinical trials to assure that data and reported results are accurate and that the trial subjects are adequately informed of the potential risks of participating in
clinical trials. The FDA enforces these GCPs through periodic inspections of trial sponsors, principal investigators, clinical trial sites and institutional
review boards. If we or our third-party contractors fail to comply with applicable GCP standards, the clinical data generated in our clinical trials may be
deemed unreliable and the FDA may require us to perform additional clinical trials before approving our product candidates, which would delay the
regulatory approval process. We cannot make assurances that, upon inspection, the FDA will determine that any of our clinical trials comply with GCP. We
are also required to register clinical trials and post the results of completed clinical trials on a government-sponsored database, ClinicalTrials.gov, within
certain timeframes. Failure to do so can result in fines, adverse publicity and civil and criminal sanctions.

Furthermore, the third parties conducting clinical trials on our behalf are not our employees, and except for remedies available to us under our
agreements with such contractors, we cannot control whether or not they devote sufficient time and resources to our ongoing development programs. These
contractors may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical trials or
other drug development activities, which could impede their ability to devote appropriate time to our clinical programs. If these third parties do not
successfully carry out their contractual duties, meet expected deadlines or conduct our clinical trials in accordance with regulatory requirements or our
stated protocols, we may not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates. If that occurs, we may not
be able to, or may be delayed in our efforts to, successfully commercialize our product candidates. In such an event, our financial results and the
commercial prospects for tebipenem HBr or our other product candidates could be harmed, our costs could increase and our ability to generate revenue
could be delayed, impaired or foreclosed.

We also rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our distributors

could delay clinical development or marketing approval of our product candidates or commercialization of any resulting products, producing additional
losses and depriving us of potential product revenue.

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We contract with third parties for the manufacture of preclinical and clinical supplies of our product candidates and expect to continue to do so in
connection with any future commercialization and for any future clinical trials and commercialization of our other product candidates and potential
product candidates. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or such
quantities at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.

We do not currently have nor do we plan to build the internal infrastructure or capability to manufacture tebipenem HBr or our other product
candidates for use in the conduct of our preclinical research, our clinical trials or for commercial supply. We currently rely on and expect to continue to rely
on third-party contract manufacturers to manufacture supplies of tebipenem HBr and our other product candidates, and we expect to rely on third-party
contract manufacturers to manufacture commercial quantities of any product candidate that we commercialize following approval for marketing by
applicable regulatory authorities, if any. Reliance on third-party manufacturers entails risks, including:

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manufacturing delays if our third-party manufacturers give greater priority to the supply of other products over our product candidates or
otherwise do not satisfactorily perform according to the terms of the agreement between us;

the possible termination or nonrenewal of the agreement by the third-party at a time that is costly or inconvenient for us;

the possible breach of the manufacturing agreement by the third-party;

the failure of the third-party manufacturer to comply with applicable regulatory requirements; and

the possible misappropriation of our proprietary information, including our trade secrets and know-how.

We currently rely on a small number of third-party contract manufacturers for all of our required raw materials, drug substance and finished product

for our preclinical research and clinical trials. We do not have long-term agreements with any of these third parties. We also do not have any current
contractual relationships for the manufacture of commercial supplies of any of our product candidates. If any of our existing manufacturers should become
unavailable to us for any reason, we may incur delays in identifying or qualifying replacements.

If any of our product candidates are approved by any regulatory agency, we intend to enter into agreements with third-party contract manufacturers

for the commercial production of those products. This process is difficult and time consuming and we may face competition for access to manufacturing
facilities as there are a limited number of contract manufacturers operating under cGMPs that are capable of manufacturing our product candidates.
Consequently, we may not be able to reach agreement with third-party manufacturers on satisfactory terms, which could delay our commercialization.

Third-party manufacturers are required to comply with cGMPs and similar regulatory requirements outside the United States. Facilities used by our

third-party manufacturers must be approved by the FDA after we submit an NDA and before potential approval of the product candidate. Similar
regulations apply to manufacturers of our product candidates for use or sale in foreign countries. We do not control the manufacturing process and are
completely dependent on our third-party manufacturers for compliance with the applicable regulatory requirements for the manufacture of our product
candidates. The inability or failure of our manufacturers to successfully manufacture material that conforms to the strict regulatory requirements of the
FDA and any applicable foreign regulatory authority, may require us to find alternative manufacturing facilities, which could result in delays in obtaining
approval for the applicable product candidate. In addition, our manufacturers are subject to ongoing periodic unannounced inspections by the FDA and
corresponding state and foreign agencies for compliance with cGMPs and similar regulatory requirements. Failure by any of our manufacturers to comply
with applicable cGMPs or other regulatory requirements could result in sanctions being imposed on us, including fines, injunctions, civil penalties, delays,
suspensions or withdrawals of approvals, operating restrictions, interruptions in supply and criminal prosecutions, any of which could significantly and
adversely affect supplies of our product candidates and have a material adverse effect on our business, financial condition and results of operations.

Our current and anticipated future dependence upon others for the manufacture of tebipenem HBr and our other product candidates and potential

product candidates may adversely affect our future profit margins and our ability to commercialize any products for which we receive marketing approval
on a timely and competitive basis.

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If we fail to comply with our obligations in the agreements under which we in-license or acquire development or commercialization rights to products,
technology or data from third parties, including those for tebipenem HBr, we could lose such rights that are important to our business.

We are a party to agreements with Meiji for tebipenem HBr, Vertex Pharmaceuticals for SPR720 and PBB Distributions Limited for SPR206, and

we may enter into additional agreements, including license agreements, with other parties in the future that impose diligence, development and
commercialization timelines, milestone payments, royalties, insurance and other obligations on us.

For example, we have an exclusive know-how license with Meiji, or the Meiji License, that gives us rights outside of specified countries in Asia to
develop, manufacture, and commercialize tebipenem HBr as well as the right to use, cross-reference, file or incorporate by reference any information and
relevant Meiji regulatory documentation to support any regulatory filings outside of Asia. In addition, we have the right to develop, manufacture and have
manufactured tebipenem HBr in Asia solely for the purpose of furthering development, manufacturing and commercialization of tebipenem HBr outside of
Asia. In exchange for those rights, we are obligated to satisfy diligence requirements, including using commercially reasonable efforts to develop and
commercialize tebipenem HBr and to implement a specified development plan, meeting specified development milestones and providing an update on
progress on an annual basis. The Meiji License requires us to pay future milestone payments of up to $2.0 million upon the achievement of specified
clinical and regulatory milestones and royalties of a low single-digit percentage on net sales on a country-by-country basis.

If we fail to comply with our obligations to Meiji or any of our other partners, our counterparties may have the right to terminate these agreements,
in which event we might not be able to develop, manufacture or market any product candidate that is covered by these agreements, which could materially
adversely affect the value of the product candidate being developed under any such agreement. Termination of these agreements or reduction or elimination
of our rights under these agreements may result in our having to negotiate new or reinstated agreements with less favorable terms, or cause us to lose our
rights under these agreements, including our rights to important intellectual property or technology.

Risks Related to Our United States Government Contracts and to Certain Grant Agreements

Our use of government funding for certain of our programs adds complexity to our research and commercialization efforts with respect to those
programs and may impose requirements that increase the costs of commercialization and production of product candidates developed under those
government-funded programs.

We have received significant non-dilutive financing from various government agencies for the further development of our product candidates. Such
funding sources may pose risks to us not encountered in other commercial contracts, including significant regulatory compliance risks. Contracts funded by
the United States government and its agencies include provisions that reflect the government’s substantial public policy and compliance requirements, and
substantial rights and remedies, many of which are not typically found in commercial contracts, including powers of the government to:

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terminate agreements, in whole or in part, for any reason or no reason;

reduce or modify the government’s obligations under such agreements without the consent of the contractor;

claim rights, including intellectual property rights, in products and data developed under such agreements;

audit contract-related costs and fees, including allocated indirect costs;

suspend the contractor from receiving new contracts pending resolution of alleged violations of procurement laws or regulations;

impose United States manufacturing requirements for products that embody inventions conceived or first reduced to practice under such
agreements;

suspend or debar the contractor or grantee from doing future business with the government;

control and potentially prohibit the export of products; and

pursue criminal or civil remedies under the False Claims Act, or the FCA, the False Statements Act and similar remedy provisions specific
to government agreements.

We may not have the right to prohibit the United States government from using certain technologies developed by us, and we may not be able to

prohibit third-party companies, including our competitors, from using those technologies in providing products and services to the United States
government. The United States government generally takes the position that it has the right to royalty-free use of technologies that are developed under
United States government contracts.

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In addition, government contracts and grants, and subcontracts and subawards awarded in the performance of those contracts and grants, normally

contain additional requirements that may increase our costs of doing business, reduce our profits, and expose us to liability for failure to comply with these
terms and conditions. These requirements include, for example:

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specialized accounting systems unique to government awards;

mandatory financial audits and potential liability for price adjustments or recoupment of government funds after such funds have been
spent;

public disclosures of certain award information, which may enable competitors to gain insights into our research program; and

mandatory socioeconomic compliance requirements, including labor standards, anti-human-trafficking, non-discrimination and
affirmative action programs, energy efficiency and environmental compliance requirements.

If we fail to maintain compliance with these requirements, we may be subject to potential contract or FCA liability and to termination of our

contracts.

United States government agencies have special contracting requirements that give them the ability to unilaterally control our contracts.

United States government contracts typically contain unfavorable termination provisions and are subject to audit and modification by the
government at its sole discretion, which will subject us to additional risks. These risks include the ability of the United States government to unilaterally:

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audit and object to our government contract-related costs and fees, and require us to reimburse all such costs and fees;

suspend or prevent us for a set period of time from receiving new contracts or extending our existing contracts based on violations or
suspected violations of laws or regulations;

cancel, terminate or suspend our contracts based on violations or suspected violations of laws or regulations;

terminate our contracts if in the government’s interest, including if funds become unavailable to the applicable governmental agency;

reduce the scope and value of our contract; and

change certain terms and conditions in our contract.

The United States government will be able to terminate any of its contracts with us, either for convenience or if we default by failing to perform in
accordance with or to achieve the milestones set forth in the contract schedules and terms. Termination-for-convenience provisions generally enable us to
recover only our costs incurred or committed and settlement expenses on the work completed prior to termination. Except for the amount of services
received by the government, termination-for-default provisions do not permit these recoveries and would make us liable for excess costs incurred by the
United States government in procuring undelivered items from another source.

Our business is subject to audit by the United States government and other potential sources for grant funding, including under our contracts with
BARDA, NIAID and DoD, and a negative outcome in an audit could adversely affect our business

United States government agencies such as the Department of Health and Human Services, or the DHHS, and the Defense Contract Audit Agency,
or the DCAA, routinely audit and investigate government contractors. These agencies review a contractor’s performance under its contracts, cost structure
and compliance with applicable laws, regulations and standards.

The DHHS and the DCAA also review the adequacy of, and a contractor’s compliance with, its internal control systems and policies, including the

contractor’s purchasing, property, estimating, compensation and management information systems. Any costs found to be improperly allocated to a specific
contract will not be paid, while such costs already paid must be refunded. If an audit uncovers improper or illegal activities, we may be subject to civil and
criminal penalties and administrative sanctions, including:

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termination of contracts;

forfeiture of profits;

suspension of payments;

fines; and

suspension or prohibition from conducting business with the United States government.

In addition, we could suffer serious reputational harm if allegations of impropriety were made against us, which could cause our stock price to

decrease.

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Laws and regulations affecting government contracts make it more expensive and difficult for us to successfully conduct our business.

We must comply with numerous laws and regulations relating to the formation, administration and performance of government contracts, which can

make it more difficult for us to retain our rights under our government contracts. These laws and regulations affect how we conduct business with
government agencies. Among the most significant government contracting regulations that affect our business are:

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the Federal Acquisition Regulations, or the FAR, and agency-specific regulations supplemental to the FAR, which comprehensively
regulate the procurement, formation, administration and performance of government contracts;

business ethics and public integrity obligations, which govern conflicts of interest and the hiring of former government employees, restrict
the granting of gratuities and funding of lobbying activities and include other requirements such as the Anti-Kickback Statute and the
Foreign Corrupt Practices Act;

export and import control laws and regulations; and

laws, regulations and executive orders restricting the use and dissemination of information classified for national security purposes and the
exportation of certain products and technical data.

These requirements change frequently, such as through appropriations bills or executive orders. Any changes in applicable laws and regulations

could restrict our ability to maintain our existing BARDA and other government contracts and obtain new contracts, which could limit our ability to
conduct our business and materially adversely affect our results of operations.

Provisions in our United States government contracts, including our contracts with BARDA, may affect our intellectual property rights.

Certain of our activities have been funded, and may in the future be funded, by the United States government, including through our contracts with

BARDA. When new technologies are developed with United States government funding, the government obtains certain rights in any resulting patents,
including the right to a nonexclusive license authorizing the government to use the invention and rights that may permit the government to disclose our
confidential information to third parties and to exercise “march-in” rights. The government can exercise its march-in rights if it determines that action is
necessary because we fail to achieve practical application of the United States government-funded technology, because action is necessary to alleviate
health or safety needs, to meet requirements of federal regulations or to give preference to United States industry. In addition, United States government-
funded inventions must be reported to the government, United States government funding must be disclosed in any resulting patent applications, and our
rights in such inventions may be subject to certain requirements to manufacture products in the United States.

Risks Related to Our Intellectual Property

If we are unable to obtain and maintain sufficient patent protection for our technology or our product candidates, or if the scope of the patent
protection is not sufficiently broad, our competitors could develop and commercialize technology and products similar or identical to ours, and our
ability to successfully commercialize our technology and product candidates may be adversely affected.

Our success depends in large part on our ability to obtain and maintain patent protection in the United States and other countries with respect to our

proprietary chemistry technology and product candidates. If we do not adequately protect our intellectual property, competitors may be able to use our
technologies and erode or negate any competitive advantage that we may have, which could harm our business and ability to achieve profitability. To
protect our proprietary position, we file patent applications in the United States and abroad related to our novel technologies and product candidates that are
important to our business. The patent application and approval process is expensive and time-consuming. We may not be able to file and prosecute all
necessary or desirable patent applications at a reasonable cost or in a timely manner. We may also fail to identify patentable aspects of our research and
development before it is too late to obtain patent protection.

The patent position of biotechnology and pharmaceutical companies generally is highly uncertain. No consistent policy regarding the breadth of
claims allowed in biotechnology and pharmaceutical patents has emerged to date in the United States or in many foreign jurisdictions. In addition, the
determination of patent rights with respect to pharmaceutical compounds and technologies commonly involves complex legal and factual questions, which
has in recent years been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights are
highly uncertain. Furthermore, changes in patent laws in the United States, including those made by the America Invents Act of 2011, may affect the scope,
strength and enforceability of our patent rights or the nature of proceedings which may be brought by us related to our patent rights.

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Our pending and future patent applications may not result in patents being issued which protect our technology or product candidates, in whole or in
part, or which effectively prevent others from commercializing competitive technologies and products. Changes in either the patent laws or interpretation of
the patent laws in the United States and other countries may diminish the value of our patents or narrow the scope of our patent protection.

The laws of foreign countries may not protect our rights to the same extent or in the same manner as the laws of the United States. For example, in
the US there is an exception for one’s own publication of an invention prior to filing a patent application for the invention.  Most other countries have no
such exception and any publication prior to filing is an absolute bar to patentability. Publications of discoveries in the scientific literature often lag behind
the actual discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some
cases not at all. Therefore, we cannot be certain that we were the first to make the inventions claimed in our patents or pending patent applications, or that
we were the first to file for patent protection of such inventions. As a result of the America Invents Act of 2011, the United States transitioned to a first-
inventor-to-file system in March 2013, under which, assuming the other requirements for patentability are met, the first inventor to file a patent application
is entitled to the patent. However, as a result of the lag in the publication of patent applications following filing in the United States, we are still not be able
to be certain upon filing that we are the first to file for patent protection for any invention. Moreover, we may be subject to a third-party preissuance
submission of prior art to the USPTO or become involved in opposition, derivation, reexamination, inter partes review or interference proceedings, in the
United States or elsewhere, challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or
litigation could reduce the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or product candidates and compete
directly with us, without payment to us, or result in our inability to manufacture or commercialize products without infringing third-party patent rights.

Even if our patent applications issue as patents, they may not issue in a form that will provide us with any meaningful protection, prevent
competitors from competing with us or otherwise provide us with any competitive advantage. Our competitors may be able to circumvent our owned or
licensed patents by developing similar or alternative technologies or products in a non-infringing manner. Our competitors may seek to market generic
versions of any approved products by submitting Abbreviated New Drug Applications to the FDA in which they claim that patents owned or licensed by us
are invalid, unenforceable and/or not infringed. Alternatively, our competitors may seek approval to market their own products similar to or otherwise
competitive with our products. In these circumstances, we may need to defend and/or assert our patents, including by filing lawsuits alleging patent
infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find our patents invalid and/or unenforceable. Even if we
have valid and enforceable patents, these patents still may not provide protection against competing products or processes sufficient to achieve our business
objectives.

The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, and our owned and licensed patents may be

challenged in the courts or patent offices in the United States and abroad. Such challenges may result in loss of exclusivity or freedom to operate or in
patent claims being narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to stop others from using or
commercializing similar or identical technology and products, or limit the duration of the patent protection of our technology and products. In addition,
given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might
expire before or shortly after such candidates are commercialized.

We may become involved in lawsuits to protect or enforce our patents or other intellectual property, which could be expensive, time consuming and
unsuccessful.

Competitors may infringe our patents, trademarks, copyrights or other intellectual property, or those of our licensors. To counter infringement or
unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming and divert the time and attention of our
management and scientific personnel. Any claims we assert against perceived infringers could provoke these parties to assert counterclaims against us
alleging that we infringe their patents. In addition, in a patent infringement proceeding, there is a risk that a court will decide that a patent of ours is invalid
or unenforceable, in whole or in part, and that we do not have the right to stop the other party from using the invention at issue. There is also a risk that,
even if the validity of such patents is upheld, the court will construe the patent’s claims narrowly or decide that we do not have the right to stop the other
party from using the invention at issue on the grounds that our patents do not cover the invention. An adverse outcome in a litigation or proceeding
involving our patents could limit our ability to assert our patents against those parties or other competitors, and may curtail or preclude our ability to
exclude third parties from making and selling similar or competitive products. Any of these occurrences could adversely affect our competitive business
position, business prospects and financial condition. Similarly, if we assert trademark infringement claims, a court may determine that the marks we have
asserted are invalid or unenforceable, or that the party against whom we have asserted trademark infringement has superior rights to the marks in question.
In this case, we could ultimately be forced to cease use of such trademarks.

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In any infringement litigation, any award of monetary damages we receive may not be commercially valuable. Furthermore, because of the
substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could
be compromised by disclosure during litigation. Moreover, there can be no assurance that we will have sufficient financial or other resources to file and
pursue such infringement claims, which typically last for years before they are concluded. Even if we ultimately prevail in such claims, the monetary cost
of such litigation and the diversion of the attention of our management and scientific personnel could outweigh any benefit we receive as a result of the
proceedings.

If we are sued for infringing intellectual property rights of third parties, or otherwise become involved in disputes regarding our intellectual property
rights, such litigation could be costly and time consuming and could prevent or delay us from developing or commercializing our product candidates.

Our commercial success depends, in part, on our ability to develop, manufacture, market and sell our product candidates and use our proprietary

chemistry technology without infringing the intellectual property and other proprietary rights of third parties. Numerous third-party United States and non-
United States issued patents and pending applications exist in the area of antibacterial treatment, including compounds, formulations, treatment methods
and synthetic processes that may be applied towards the synthesis of antibiotics. If any of their patents or patent applications cover our product candidates
or technologies, we may not be free to manufacture or market our product candidates as planned.

There is a substantial amount of intellectual property litigation in the biotechnology and pharmaceutical industries, and we may become party to, or

threatened with, litigation or other adversarial proceedings regarding intellectual property rights with respect to our technology or product candidates,
including interference proceedings before the USPTO. Intellectual property disputes arise in a number of areas including with respect to patents, use of
other proprietary rights and the contractual terms of license arrangements. Third parties may assert claims against us based on existing or future intellectual
property rights. The outcome of intellectual property litigation is subject to uncertainties that cannot be adequately quantified in advance. With respect to
our Meiji License of certain know-how used in tebipenem pivoxil HBr, we are neither a party to, nor an express third-party beneficiary of, the letter
agreement between Meiji and Global Pharma consenting to Meiji’s arrangement with us. As such, if any dispute among the parties were to occur, our direct
enforcement rights with respect to the letter agreement may be limited or uncertain. A termination or early expiration of the head license between Meiji and
Global Pharma (which currently by its terms is set to expire in January 2022) or any restriction on our ability to use the Global Pharma know-how could
have a negative impact on our development of tebipenem HBr and adversely affect our business.

If we are found to infringe a third party’s intellectual property rights, we could be forced, including by court order, to cease developing,

manufacturing or commercializing the infringing product candidate or product. Alternatively, we may be required to obtain a license from such third party
in order to use the infringing technology and continue developing, manufacturing or marketing the infringing product candidate. However, we may not be
able to obtain any required license on commercially reasonable terms or at all. Even if we were able to obtain a license, it could be non-exclusive, thereby
giving our competitors access to the same technologies licensed to us. In addition, we could be found liable for monetary damages, including treble
damages and attorneys’ fees if we are found to have willfully infringed a patent. A finding of infringement could prevent us from commercializing our
product candidates or force us to cease some of our business operations, which could materially harm our business. Claims that we have misappropriated
the confidential information or trade secrets of third parties could have a similar negative effect on our business.

We may be subject to claims that we or our employees, consultants or contractors have misappropriated the intellectual property of a third party, or
claims asserting ownership of what we regard as our own intellectual property.

Many of our employees, consultants and contractors are currently, or were previously, employed at universities or other biotechnology or
pharmaceutical companies, including our competitors or potential competitors. Although we try to ensure that these individuals do not use the intellectual
property and other proprietary information or know-how of others in their work for us, we may be subject to claims that we or these individuals have used
or disclosed such intellectual property or other proprietary information. Litigation may be necessary to defend against these claims.

In addition, while we typically require our employees, consultants and contractors who may be involved in the development of intellectual property

to execute agreements assigning such intellectual property to us, we may be unsuccessful in executing such an agreement with each party who in fact
develops intellectual property that we regard as our own. To the extent that we fail to obtain such assignments or such assignments are breached, we may be
forced to bring claims against third parties, or defend claims they may bring against us, to determine the ownership of what we regard as our intellectual
property. If we fail in prosecuting or defending any such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights
or personnel. Even if we are successful in prosecuting or defending against such claims, litigation could result in substantial costs and be a distraction to
our management and scientific personnel.

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If we are unable to protect the confidentiality of our trade secrets, the value of our technology could be materially adversely affected and our business
would be harmed.

In addition to seeking patents for some of our technology and products, we also rely on trade secrets, including unpatented know-how, technology

and other proprietary information, in seeking to develop and maintain a competitive position. We seek to protect these trade secrets, in part, by entering
into non-disclosure and confidentiality agreements with parties who have access to them, such as our consultants, independent contractors, advisors,
corporate collaborators, outside scientific collaborators, contract manufacturers, suppliers and other third parties. We, as well as our licensors, also enter
into confidentiality and invention or patent assignment agreements with employees and certain consultants. Any party with whom we have executed such
an agreement may breach that agreement and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate
remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult, expensive and time-consuming,
and the outcome is unpredictable. In addition, if any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we
would have no right to prevent such third party, or those to whom they communicate such technology or information, from using that technology or
information to compete with us. If any of our trade secrets were to be disclosed to or independently developed by a competitor, our business and
competitive position could be harmed.

We have registered trademarks and pending trademark applications. Failure to enforce our registered marks or secure registration of our pending
trademark applications could adversely affect our business.

We have registered our trademarks for our name and logo in the United States and other countries and have a number of pending trademark

applications in the United States and other countries. As of December 31, 2020, Spero therapeutics has two registered United States trademarks, nine
registered foreign trademarks, and nine pending trademark applications. If our registered trademarks are invalidated, we may be unable to exclusively use
our name or logo in certain jurisdictions or may need to change our name or logo in certain jurisdiction, which could affect our business. If we do not
secure registrations for our pending trademark applications, we may encounter more difficulty in enforcing them against third parties, which could
adversely affect our business. We have not yet registered trademarks for any of our product candidates in any jurisdiction. When we file trademark
applications for our product candidates, those applications may not be allowed for registration, and registered trademarks may not be obtained, maintained,
or enforced. During trademark registration proceedings in the United States and foreign jurisdictions, we may receive rejections. We are given an
opportunity to respond to those rejections, but we may not be able to overcome such rejections. In addition, in the United States Patent and Trademark
Office and in comparable agencies in many foreign jurisdictions, third parties are given an opportunity to oppose pending trademark applications and to
seek to cancel registered trademarks. Opposition or cancellation proceedings may be filed against our trademarks, and our trademarks may not survive such
proceedings.

In addition, any proprietary name we propose to use with tebipenem HBr or any other product candidate in the United States must be approved by
the FDA, regardless of whether we have registered it, or applied to register it, as a trademark. The FDA typically conducts a review of proposed product
names, including an evaluation of potential for confusion with other product names. If the FDA objects to any of our proposed proprietary product names,
we may be required to expend significant additional resources in an effort to identify a suitable proprietary product name that would qualify under
applicable trademark laws, not infringe the existing rights of third parties and be acceptable to the FDA.

Risks Related to Regulatory Approval and Other Legal Compliance Matters

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we will not be able to commercialize tebipenem HBr or
our other product candidates, and our ability to generate revenue will be materially impaired.

Our product candidates and the activities associated with their development and commercialization, including their design, testing, manufacture,
safety, efficacy, recordkeeping, labeling, storage, approval, advertising, promotion, sale and distribution, are subject to comprehensive regulation by the
FDA and other regulatory agencies in the United States and by comparable foreign regulatory authorities, with regulations differing from country to
country. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product candidate. We currently do not
have any products approved for sale in any jurisdiction. We have only limited experience in filing and supporting the applications necessary to gain
marketing approvals and expect to rely on third-party contract research organizations to assist us in this process.

The time required to obtain approval, if any, by the FDA and comparable foreign authorities is unpredictable but typically takes many years

following the commencement of clinical trials and depends upon numerous factors, including the substantial discretion of the regulatory authorities. In
addition, approval policies, regulations, or the type and amount of clinical data necessary to gain approval may change during the course of a product
candidate’s clinical development and may vary among jurisdictions. We have not obtained regulatory approval for any product candidate and it is possible
that none of our existing product candidates or any product candidates we may seek to develop in the future will ever obtain regulatory approval. Neither
we nor any future collaborators are permitted to market any of our product candidates in the United States until we or they receive regulatory approval of
an NDA from the FDA.

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In order to obtain approval to commercialize a product candidate in the United States or abroad, we or our collaborators must demonstrate to the

satisfaction of the FDA or foreign regulatory agencies, that such product candidates are safe and effective for their intended uses. Results from nonclinical
studies and clinical trials can be interpreted in different ways. Even if we believe that the nonclinical or clinical data for our product candidates are
promising, such data may not be sufficient to support approval by the FDA and other regulatory authorities. The FDA may also require us to conduct
additional nonclinical studies or clinical trials for our product candidates either prior to or post-approval, and it may otherwise object to elements of our
clinical development program.

We have not submitted an NDA for any of our product candidates, although we are currently preparing the NDA to seek marketing approval for

tebipenem HBr for the treatment of cUTI. An NDA must include extensive preclinical and clinical data and supporting information to establish the product
candidate’s safety and efficacy for each desired indication. The NDA must also include significant information regarding the chemistry, manufacturing and
controls for the product candidate. Obtaining approval of an NDA is a lengthy, expensive and uncertain process. The FDA has substantial discretion in the
review and approval process and may refuse to accept for filing any application or may decide that our data are insufficient for approval and require
additional nonclinical, clinical or other studies. Foreign regulatory authorities have differing requirements for approval of drugs with which we must
comply with prior to marketing. Obtaining marketing approval for marketing of a product candidate in one country does not ensure that we will be able to
obtain marketing approval in other countries, but the failure to obtain marketing approval in one jurisdiction could negatively affect our ability to obtain
marketing approval in other jurisdictions. The FDA or any foreign regulatory bodies can delay, limit or deny approval of our product candidates or require
us to conduct additional nonclinical or clinical testing or abandon a program for many reasons, including:

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the FDA or the applicable foreign regulatory agency’s disagreement with the design or implementation of our clinical trials;

negative or ambiguous results from our clinical trials or results that may not meet the level of statistical significance required by the FDA
or comparable foreign regulatory agencies for approval;

serious and unexpected drug-related side effects experienced by participants in our clinical trials or by individuals using drugs similar to
our product candidates;

our inability to demonstrate to the satisfaction of the FDA or the applicable foreign regulatory body that our product candidates are safe
and effective for the proposed indication;

the FDA’s or the applicable foreign regulatory agency’s disagreement with the interpretation of data from nonclinical studies or clinical
trials;

our inability to demonstrate the clinical and other benefits of our product candidates outweigh any safety or other perceived risks;

the FDA’s or the applicable foreign regulatory agency’s requirement for additional nonclinical studies or clinical trials;

the FDA’s or the applicable foreign regulatory agency’s disagreement regarding the formulation, labeling and/or the specifications for our
product candidates; or

the potential for approval policies or regulations of the FDA or the applicable foreign regulatory agencies to significantly change in a
manner rendering our clinical data insufficient for approval.

Of the large number of drugs in development, only a small percentage complete the FDA or foreign regulatory approval processes and are
successfully commercialized. The lengthy review process as well as the unpredictability of future clinical trial results may result in our failing to obtain
regulatory approval, which would significantly harm our business, financial condition, results of operations and prospects.

Even if we eventually receive approval of an NDA or foreign marketing application for our product candidates, the FDA or the applicable foreign
regulatory agency may grant approval contingent on the performance of costly additional clinical trials, often referred to as Phase 4 clinical trials, and the
FDA may require the implementation of an REMS which may be required to ensure safe use of the drug after approval. The FDA or the applicable foreign
regulatory agency also may approve a product candidate for a more limited indication or patient population than we originally requested, and the FDA or
applicable foreign regulatory agency may not approve the labeling that we believe is necessary or desirable for the successful commercialization of a
product candidate. Any delay in obtaining, or inability to obtain, applicable regulatory approval would delay or prevent commercialization of that product
candidate and would materially adversely impact our business and prospects.

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A fast track designation may not actually lead to a faster development or regulatory review or approval process.

We have received fast track designation for tebipenem HBr for the treatment of complicated urinary tract infections and acute pyelonephritis, as well

as fast track designation for SPR720 for treatment of adult patients with NTM-PD, and we may seek fast track designation for one or more of our other
product candidates in the future. If a drug is intended for the treatment of a serious condition and nonclinical or clinical data demonstrate the potential to
address unmet medical need for this condition, a drug sponsor may apply for fast track designation by the FDA for the particular indication under study. If
fast track designation is obtained, the FDA may initiate review of sections of an NDA before the application is complete. This “rolling review” is available
if the applicant provides and the FDA approves a schedule for the remaining information. If we seek fast track designation for a product candidate, we may
not receive it from the FDA. However, even if we receive fast track designation, fast track designation does not ensure that we will receive marketing
approval or that approval will be granted within any particular timeframe. We may not experience a faster development or regulatory review or approval
process with fast track designation compared to conventional FDA procedures. In addition, the FDA may withdraw fast track designation if it believes that
the designation is no longer supported by data from our clinical development program. Fast track designation alone does not guarantee qualification for the
FDA’s priority review procedures.

In March 2020, the FDA granted orphan drug designation for SPR720. We may seek orphan drug designation for certain of our other product
candidates. We may not be able to obtain or maintain orphan drug designations for any of our other product candidates, and we may be unable to take
advantage of the benefits associated with orphan drug designation, including the potential for market exclusivity.

Regulatory authorities in some jurisdictions, including the United States, may designate drugs for relatively small patient populations as orphan
drugs. Under the Orphan Drug Act of 1983, the FDA may designate a product as an orphan product if it is intended to treat a rare disease or condition,
which is generally defined as a patient population of fewer than 200,000 individuals in the United States, or a patient population of greater than 200,000
individuals in the United States, but for which there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the
United States. There can be no assurance that the FDA will grant orphan designation for any indication for which we apply.

In the United States, orphan designation entitles a party to financial incentives such as opportunities for grant funding towards clinical trial costs, tax

advantages and user-fee waivers. In addition, if a product candidate that has orphan drug designation subsequently receives the first FDA approval for the
disease for which it has such designation, it is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications,
including an NDA, to market the same drug for the same indication for seven years, except in limited circumstances, such as a showing of clinical
superiority to the product with orphan drug exclusivity or where the manufacturer is unable to assure sufficient product quantity.

Even though we have obtained orphan drug designation for SPR720 and may seek orphan drug designation for other product candidates in the

future, there is no assurance that we will be the first to obtain marketing approval for NTM infection or for any particular rare indication. Further, even
though we have obtained orphan drug designation for SPR720, or even if we obtain orphan drug designation for other product candidates, such designation
may not effectively protect us from competition because different drugs can be approved for the same condition and the same drug can be approved for
different conditions and potentially used off-label in the orphan indication. Even after an orphan drug is approved, the FDA can subsequently approve a
competing drug for the same condition for several reasons, including, if the FDA concludes that the later drug is safer or more effective or makes a major
contribution to patient care. Orphan drug designation neither shortens the development time or regulatory review time of a drug, nor gives the drug any
advantage in the regulatory review or approval process.

If approved for commercial marketing in the United States, our lead product candidate tebipenem HBr and our other product candidates may face
generic competition sooner than anticipated.

Even if we are successful in achieving regulatory approval to commercialize a product candidate, it may face competition from generic products

earlier or more aggressively than anticipated, depending upon how well our future products perform in the United States prescription drug market. In
addition to creating the 505(b)(2) NDA pathway, the Hatch-Waxman Amendments to the FDCA authorized the FDA to approve generic drugs that are the
same as drugs previously approved for marketing under the NDA provisions of the statute pursuant to abbreviated new drug applications, or ANDAs. An
ANDA relies on the preclinical and clinical testing conducted for a previously approved reference listed drug, or RLD, and must demonstrate to the FDA
that the generic drug product is identical to the RLD with respect to the active ingredients, the route of administration, the dosage form, and the strength of
the drug and also that it is “bioequivalent” to the RLD. The FDA is prohibited by statute from approving an ANDA when certain marketing or data
exclusivity protections apply to the RLD.

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If the FDA approves our future NDA for tebipenem HBr for the treatment of cUTI we expect that it will be designated by the agency as an RLD and
that it will be eligible for five-year new chemical entity exclusivity under the Hatch-Waxman provisions of the FDCA. This exclusivity period would block
FDA from approving either a subsequent ANDA or 505(b)(2) NDA that references our future NDA, if approved. The QIDP designation granted by FDA to
this drug product and indication also make it eligible for a further five-year extension of that Hatch-Waxman exclusivity. We cannot predict the interest of
potential generic competitors in the future market for such an approved treatment for cUTI, whether someone will attempt to invalidate our period of
exclusivity or otherwise force the FDA to take other actions, or how quickly others may seek to come to market with competing products after the
applicable exclusivity period ends. Future product candidates may also receive marketing exclusivity under the FDCA after approval that may similarly be
subject to challenge or uncertainty.

If we are unable to obtain marketing approval in international jurisdictions, we will not be able to market our product candidates abroad.

In order to market and sell tebipenem HBr or our other product candidates in the European Union and many other jurisdictions, we must obtain

separate marketing approvals and comply with numerous and varying regulatory requirements. Approval by the FDA does not ensure approval by
regulatory authorities in other countries or jurisdictions, and approval by one regulatory authority outside the United States does not ensure approval by
regulatory authorities in other countries or jurisdictions or by the FDA. The approval procedure varies among countries and can involve additional testing.
In addition, clinical trials conducted in one country may not be accepted by regulatory authorities in other countries. The time required to obtain approval
from regulatory authorities in other countries may differ substantially from that required to obtain FDA approval. The regulatory approval process outside
the United States generally includes all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, it is
required that the product be approved for reimbursement before the product can be approved for sale in that country. We may not obtain approvals from
regulatory authorities outside the United States on a timely basis or at all.

If we receive regulatory approval for any product candidate, we will be subject to ongoing obligations and continuing regulatory review, which may
result in significant additional expense. Our product candidates, if approved, could be subject to restrictions or withdrawal from the market, and we
may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our product candidates,
when and if approved.

Any product candidate for which we obtain marketing approval will also be subject to ongoing regulatory requirements for labeling, packaging,

storage, distribution, advertising, promotion, record keeping and submission of safety and other post-market information. For example, approved products,
manufacturers and manufacturers’ facilities are required to comply with extensive FDA requirements, including ensuring that quality control and
manufacturing procedures conform to cGMPs. As such, we and our contract manufacturers will be subject to continual review and periodic inspections to
assess compliance with cGMPs. Accordingly, we and others with whom we work must continue to expend time, money and effort in all areas of regulatory
compliance, including manufacturing, production and quality control. We will also be required to report certain adverse reactions and production problems,
if any, to the FDA and to comply with requirements concerning advertising and promotion for our products.

In addition, even if marketing approval of a product candidate is granted, the approval may be subject to limitations on the indicated uses for which

the product may be marketed, may be subject to significant conditions of approval or may impose requirements for costly post-marketing testing and
surveillance to monitor the safety or efficacy of the product. The FDA may also require a REMS as a condition of approval of our product candidates,
which could include requirements for a medication guide, physician communication plans or additional elements to ensure safe use, such as restricted
distribution methods, patient registries and other risk minimization tools. The FDA closely regulates the post-approval marketing and promotion of drugs to
ensure that drugs are marketed only for the approved indications and in accordance with the provisions of the approved labeling and regulatory
requirements. The FDA also imposes stringent restrictions on manufacturers’ communications regarding off-label use and if we do not restrict the
marketing of our products only to their approved indications, we may be subject to enforcement action for off-label marketing.

If a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or

problems with the facility where the product is manufactured, or disagrees with the promotion, marketing or labeling of a product, it may impose
restrictions on that product or us. In addition, if any product fails to comply with applicable regulatory requirements, a regulatory agency may:

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issue  warning letters, untitled letters or impose holds on clinical trials if any are still on-going;

mandate modifications to promotional materials or require provision of corrective information to healthcare practitioners;

impose restrictions on the product or its manufacturers or manufacturing processes;

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impose restrictions on the labeling or marketing of the product;

impose restrictions on product distribution or use;

require post-marketing studies or clinical trials;

require withdrawal of the product from the market;

refuse to approve pending applications or supplements to approved applications that we submit;

require recall of the product;

require entry into a consent decree, which can include imposition of various fines (including restitution or disgorgement of profits or
revenue), reimbursements for inspection costs, required due dates for specific actions and penalties for noncompliance;

suspend or withdraw marketing approvals;

refuse to permit the import or export of the product;

seize or detain supplies of the product; or

issue injunctions or impose civil or criminal penalties.

The FDA’s policies may change and additional government regulations may be enacted that could prevent, limit or delay marketing approval of our
product candidates. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not
able to maintain regulatory compliance, we may lose any marketing approval that we may have obtained, which would adversely affect our business,
prospects and ability to achieve or sustain profitability.

Our relationships with customers and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other healthcare laws and
regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future
earnings.

Healthcare providers, physicians and third-party payors will play a primary role in the recommendation and prescription of any product candidates

for which we may obtain marketing approval. Our future arrangements with third-party payors and customers will expose us to broadly applicable fraud
and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market,
sell and distribute any products for which we obtain marketing approval and reimbursement. These laws and regulations include, for example, the false
claims and anti-kickback statutes and regulations. At such time as we market, sell and distribute any products for which we obtain marketing approval and
reimbursement, it is possible that our business activities could be subject to challenge under one or more of these laws and regulations. Restrictions under
applicable federal and state healthcare laws and regulations include the following:

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the federal healthcare Anti-Kickback Statute, among other things, prohibits persons from knowingly and willfully soliciting, offering,
receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the referral of an individual for, or
the purchase, order or recommendation of, any good or service for which payment may be made under federally funded healthcare
programs such as Medicare and Medicaid. A person or entity does not need to have actual knowledge of the statute or specific intent to
violate the statute in order to have committed a violation. In addition, the government may assert that a claim that includes items or
services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False
Claims Act;

the federal False Claims Act imposes criminal and civil penalties, which can be enforced by private citizens through civil whistleblower
and qui tam actions, against individuals or entities for knowingly presenting, or causing to be presented, to the federal government, claims
for payment that are false or fraudulent or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal
government;

the federal ban on physician self-referrals, which prohibits, subject to certain exceptions, physician referrals of Medicare or Medicaid
patients to an entity providing certain “designated health services” if the physician or an immediate family member of the physician has
any financial relationship with the entity;

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the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, imposes criminal and civil liability for executing a
scheme to defraud any healthcare benefit program or for making any false statements relating to healthcare matters; as in the case of the
federal healthcare Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to
violate the statute in order to have committed a violation;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, also imposes obligations on certain
covered entities as well as their business associates that perform certain services involving the use or disclosure of individually
identifiable health information, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission
of individually identifiable health information, and requires notification to affected individuals and regulatory authorities of certain
breaches of security of individually identifiable health information;

the federal false statements statute prohibits knowingly and willfully falsifying, concealing or covering up a material fact or making any
materially false statement in connection with the delivery of or payment for healthcare benefits, items or services;

the federal transparency or “sunshine” requirements under the Patient Protection and Affordable Care Act, as amended by the Health Care
and Education Affordability Reconciliation Act, or collectively, the ACA, requires manufacturers of drugs, devices, biologics and medical
supplies covered by Medicare or Medicaid to report, on an annual basis, to the United States Department of Health and Human Services,
or DHHS, information related to payments and other transfers of value to physicians (defined to include doctors, dentists, optometrists,
podiatrists, chiropractors and, beginning in 2022 for payments and other transfers of value provided in the previous year, certain advanced
non-physician health care practitioners), teaching hospitals, as well as ownership and investment interests held by physicians and their
immediate family members; and

analogous state laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing arrangements and
claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers, and some
state laws require pharmaceutical companies to implement compliance programs and to track and report gifts, compensation and other
remuneration provided to physicians, in addition to requiring drug manufacturers to report information related to payments to physicians
and other healthcare providers or marketing expenditures and pricing information. State laws also govern the privacy and security of
health information in some circumstances, and many such state laws differ from each other in significant ways and often are not
preempted by HIPAA, thus complicating compliance efforts.

We will be required to spend substantial time and money to ensure that our business arrangements with third parties, and our business generally,

comply with applicable healthcare laws and regulations. Even then, governmental authorities may conclude that our business practices, including
arrangements we may have with physicians and other healthcare providers, some of whom may receive stock options as compensation for services
provided, do not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and
regulations. If governmental authorities find that our operations violate any of these laws or any other governmental regulations that may apply to us, we
may be subject to significant civil, criminal and administrative penalties, damages, imprisonment, fines, exclusion from government funded healthcare
programs, such as Medicare and Medicaid, and we may be required to curtail or restructure our operations. Moreover, we expect that there will continue to
be federal and state laws and regulations, proposed and implemented, that could affect our operations and business. For example, in November 2020,
DHHS finalized significant changes to the regulations implementing the Anti-Kickback Statute, as well as the Physician Self-Referral Law (Stark Law) and
the civil monetary penalty rules regarding beneficiary inducements, with the goal of offering the healthcare industry more flexibility and reducing the
regulatory burden associated with those fraud and abuse laws, particularly with respect to value-based arrangements among industry participants. The
extent to which future legislation or regulations, if any, relating to healthcare fraud and abuse laws or enforcement, may be enacted or what effect such
legislation or regulation would have on our business remains uncertain.

Recently enacted and future policies and legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our
product candidates and may affect the reimbursement made for any product candidate for which we receive marketing approval.

The pricing and reimbursement environment may become more challenging due to, among other reasons, policies advanced by the new presidential

administration, federal agencies, new healthcare legislation passed by the United States Congress or fiscal challenges faced by all levels of government
health administration authorities. Among policy makers and payors in the United States and foreign countries, there is significant interest in promoting
changes in healthcare systems with the stated goals of containing healthcare costs, improving quality and expanding access to healthcare. In the United
States, the pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives. We expect
to experience pricing pressures in connection with the sale of any products for which we obtain marketing approval, due to the trend toward managed
healthcare, the increasing influence of health maintenance organizations and additional legislative proposals. Resulting legislative, administrative, or policy
changes from payors may reduce payments for any products for which we obtain marketing approval and could affect future revenues.

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The ACA became law in the United States in March 2010 with the goals of broadening access to health insurance, reducing or constraining the
growth of healthcare spending, enhancing remedies against fraud and abuse, adding new transparency requirements for the health care and health insurance
industries and imposing additional health policy reforms. Provisions of ACA may negatively affect our future revenues. For example, the ACA requires,
among other things, that annual fees be paid by manufacturers for certain branded prescription drugs, that manufacturers participate in a discount program
for certain outpatient drugs under Medicare Part D, and that manufacturers provide increased rebates under the Medicaid Drug Rebate Program for
outpatient drugs dispensed to Medicaid recipients. The ACA also addresses a new methodology by which rebates owed by manufacturers under the
Medicaid Drug Rebate Program are calculated for line extensions and expands oversight and support for the federal government’s comparative
effectiveness research of services and products.

Since its enactment, there have been judicial and Congressional challenges to certain aspects of the ACA, and as a result certain sections of the ACA

have not been fully implemented or effectively repealed. The uncertainty around the future of the ACA, and in particular the impact to reimbursement
levels, may lead to uncertainty or delay in the purchasing decisions of our customers, which may in turn negatively impact our product sales. If there are
not adequate reimbursement levels, our business and results of operations could be adversely affected.

Beginning on April 1, 2013, Medicare payments for all items and services under Part A and B, including drugs and biologicals, and most payments
to plans under Medicare Part D were reduced by 2%, or automatic spending reductions, required by the Budget Control Act of 2011, or BCA, as amended
by the American Taxpayer Relief Act of 2012. The BCA requires sequestration for most federal programs, excluding Medicaid, Social Security, and certain
other programs. The BCA caps the cuts to Medicare payments for items and services and payments to Part D plans at 2%. Subsequent legislation extended
the 2% reduction, on average, to 2025. As long as these cuts remain in effect, they could adversely affect payment for our product candidates. We expect
that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state
governments will pay for healthcare products and services, which could result in reduced demand for our product candidates or additional pricing
pressures. The Coronavirus Aid, Relief, and Economic Security Act, or the CARES Act, which was signed into law on March 27, 2020 and was designed
to provide financial support and resources to individuals and businesses affected by the COVID-19 pandemic, suspended the 2% Medicare sequester from
May 1, 2020 through December 31, 2020, and extended the sequester by one year, through 2030, in order to offset the added expense of the 2020
cancellation. The 2021 Consolidated Appropriations Act was subsequently signed into law on December 27, 2020 and extends the CARES Act suspension
period to March 31, 2021.

Moreover, there has been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products. There

have been several United States Congressional inquiries and proposed bills designed to, among other things, bring more transparency to drug pricing,
reduce the cost of prescription drugs under Medicare, review the relationship between pricing and manufacturer patient programs, and reform government
program reimbursement methodologies for drugs. Individual states in the United States have also become increasingly active in passing legislation and
implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions
on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other
countries and bulk purchasing. In December 2020, the U.S. Supreme Court held unanimously that federal law does not preempt the states’ ability to
regulate pharmaceutical benefit managers, or PBMs, and other members of the health care and pharmaceutical supply chain, an important decision that may
lead to further and more aggressive efforts by states in this area.

Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional activities for

pharmaceutical products. We cannot be sure whether additional legislative changes will be enacted, or whether the FDA regulations, guidance or
interpretations will be changed, or what the effect of such changes on the marketing approvals of our product candidates, if any, may be. In addition,
increased scrutiny by the United States Congress of the FDA’s approval process may significantly delay or prevent marketing approval, as well as subject
us to more stringent product labeling and post-marketing testing and other requirements.

We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative or executive

action, either in the United States or abroad. We expect that additional state and federal health care reform measures will be adopted in the future, any of
which could limit the amounts that federal and state governments will pay for health care products and services. Moreover, the Biden Administration,
including his nominee for Secretary of DHHS, has indicated that lowering prescription drug prices is a priority, but we do not yet know what steps the
administration will take or whether such steps will be successful.

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If we successfully commercialize one of our product candidates, failure to comply with our reporting and payment obligations under United States
governmental pricing programs could have a material adverse effect on our business, financial condition and results of operations.

If we participate in the Medicaid Drug Rebate Program if and when we successfully commercialize a product candidate, we will be required to

report certain pricing information for our product to the Centers for Medicare & Medicaid Services, the federal agency that administers the Medicaid and
Medicare programs. We may also be required to report pricing information to the United States Department of Veterans Affairs. If we become subject to
these reporting requirements, we will be liable for errors associated with our submission of pricing data, for failure to report pricing data in a timely
manner, and for overcharging government payers, which can result in civil monetary penalties under the Medicaid statute, the federal civil False Claims
Act, and other laws and regulations.

Additionally, the 2021 Consolidated Appropriations Act signed into law on December 27, 2020 incorporated extensive healthcare provisions and
amendments to existing laws, which includes a requirement that all manufacturers of drug products covered under Medicare Part B report the product’s
average sales price, or ASP, to DHHS beginning on January 1, 2022, subject to enforcement via civil money penalties.  

Our employees, independent contractors, principal investigators, contract research organizations, consultants or vendors may engage in misconduct or
other improper activities, including noncompliance with regulatory standards and requirements.

We are exposed to the risk that our employees, independent contractors, principal investigators, contract research organizations, consultants or
vendors may engage in fraudulent or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct or
disclosure of unauthorized activities to us that violates: FDA regulations, including those laws requiring the reporting of true, complete and accurate
information to the FDA; manufacturing standards; federal and state healthcare fraud and abuse laws and regulations; or laws that require the true, complete
and accurate reporting of financial information or data. Specifically, sales, marketing and business arrangements in the healthcare industry are subject to
extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and other abusive practices. These laws and regulations may restrict or
prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business arrangements.
Activities subject to these laws also involve the improper use or misrepresentation of information obtained in the course of clinical trials or creating
fraudulent data in our preclinical studies or clinical trials, which could result in regulatory sanctions and serious harm to our reputation. It is not always
possible to identify and deter misconduct by our employees and other third parties, and the precautions we take to detect and prevent this activity may not
be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits
stemming from a failure to be in compliance with such laws or regulations. Additionally, we are subject to the risk that a person could allege such fraud or
other misconduct, even if none occurred. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our
rights, those actions could have a significant impact on our business, including the imposition of civil, criminal and administrative penalties, damages,
monetary fines, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, contractual damages, reputational
harm, diminished potential profits and future earnings, and curtailment of our operations, any of which could adversely affect our business, financial
condition, results of operations or prospects.

Inadequate funding for the FDA, the SEC and other government agencies could hinder their ability to hire and retain key leadership and other
personnel, prevent our product candidates from being developed or commercialized in a timely manner or otherwise prevent those agencies from
performing normal business functions on which the operation of our business relies, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels,

ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory and policy changes. Average review times at the
agency have fluctuated in recent years as a result. In addition, government funding of the SEC and other government agencies on which our operations may
rely, including those that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary
government agencies, which would adversely affect our business. For example, over the last several years, the United States government has shut down
several times and certain regulatory agencies, such as the FDA and the SEC, have had to furlough critical FDA, SEC and other government employees and
stop critical activities. If a prolonged government shutdown occurs, it could significantly affect the ability of the FDA to timely review and process our
regulatory submissions, which could have a material adverse effect on our business. Further, in our operations as a public company, future government
shutdowns could impact our ability to access the public markets and obtain necessary capital in order to properly capitalize and continue our operations.

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Separately, in response to the COVID-19 pandemic and public health emergency declaration in the United States, on March 10, 2020, the FDA
announced its intention to temporarily postpone most inspections of foreign manufacturing facilities and products. On March 18, 2020, the FDA announced
its intention to temporarily postpone routine surveillance inspections of domestic manufacturing facilities and provided guidance regarding the conduct of
clinical trials, which has been updated periodically since that time with common questions and answers. As of January 29, 2021, the FDA noted it was
continuing to ensure timely reviews of applications for medical products during the COVID-19 pandemic in line with its user fee performance goals and
conducting mission-critical domestic and foreign inspections to ensure compliance of manufacturing facilities with FDA quality standards. As of October
2020, Utilizing a rating system to assist in determining when and where it is safest to conduct such inspections based on data about the virus’s trajectory in
a given state and locality and the rules and guidelines that are put in place by state and local governments, FDA is either continuing to, on a case-by-case
basis, conduct only mission-critical inspections, or, where possible to do so safely, resuming prioritized domestic inspections, which generally include pre-
approval inspections. Foreign pre-approval inspections that are not deemed mission-critical remain postponed, while those deemed mission-critical will be
considered for inspection on a case-by-case basis. FDA will use similar data to inform resumption of prioritized operations abroad as it becomes feasible
and advisable to do so, and it has recently resumed inspections in China and plans to also resume such activities in India as soon as possible. The FDA may
not be able to maintain this pace and delays or setbacks are possible in the future.

Should FDA determine that an inspection is necessary for NDA approval and an inspection cannot be completed during the review cycle due to
restrictions on travel, FDA has stated that it generally intends to issue a complete response letter. Further, if there is inadequate information to make a
determination on the acceptability of a facility, FDA may defer action on the application until an inspection can be completed. Additionally, regulatory
authorities outside the United States may adopt similar restrictions or other policy measures in response to the COVID-19 pandemic. If a prolonged
government shutdown recurs, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could
have a material adverse effect on our business. Further, future government shutdowns could impact our ability to access the public markets and obtain
necessary capital in order to properly capitalize and continue our operations.

If a prolonged government shutdown or slowdown occurs, it could significantly affect the ability of the FDA to timely review and process our

regulatory submissions, which could have a material adverse effect on our business. Further, in our operations as a public company, future government
shutdowns could impact our ability to access the public markets and obtain necessary capital in order to properly capitalize and continue our operations.

Risks Related to Employee Matters and Managing Growth

Our future success depends on our ability to retain our chief executive officer and other key executives and to attract, retain and motivate qualified
personnel.

Our industry has experienced a high rate of turnover of management personnel in recent years. We are highly dependent on the development,

regulatory, commercialization and business development expertise of Ankit Mahadevia, M.D., our President and Chief Executive Officer, as well as the
other principal members of our management, scientific and clinical team. Although we have formal employment agreements with our executive officers,
these agreements do not prevent them from terminating their employment with us at any time.

If we lose one or more of our executive officers or key employees, our ability to implement our business strategy successfully could be seriously
harmed. Furthermore, replacing executive officers and key employees may be difficult and may take an extended period of time because of the limited
number of individuals in our industry with the breadth of skills and experience required to develop, gain regulatory approval of and commercialize product
candidates successfully. Competition to hire from this limited pool is intense, and we may be unable to hire, train, retain or motivate these additional key
personnel on acceptable terms given the competition among numerous pharmaceutical and biotechnology companies for similar personnel. We also
experience competition for the hiring of scientific and clinical personnel from universities and research institutions. In addition, we rely on consultants and
advisors, including scientific and clinical advisors, to assist us in formulating our research and development and commercialization strategy. Our
consultants and advisors may be engaged by entities other than us and may have commitments under consulting or advisory contracts with other entities
that may limit their availability to us. If we are unable to continue to attract and retain high quality personnel, our ability to develop and commercialize
product candidates will be limited.

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We expect to grow our organization, and as a result, we may encounter difficulties in managing our growth, which could disrupt our operations.

We expect to experience significant growth in the number of our employees and the scope of our operations, particularly in the areas of product
candidate development, regulatory affairs and sales, marketing and distribution. Our management may need to divert a disproportionate amount of its
attention away from our day-to-day activities to devote time to managing these growth activities. To manage these growth activities, we must continue to
implement and improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified
personnel. Due to our limited financial resources and the limited experience of our management team in managing a company with such anticipated
growth, we may not be able to effectively manage the expansion of our operations or recruit and train additional qualified personnel. Our inability to
effectively manage the expansion of our operations may result in weaknesses in our infrastructure, give rise to operational mistakes, loss of business
opportunities, loss of employees and reduced productivity among remaining employees. Our expected growth could require significant capital expenditures
and may divert financial resources from other projects, such as the development of additional product candidates. If our management is unable to
effectively manage our expected growth, our expenses may increase more than expected, our potential ability to generate revenue could be reduced and we
may not be able to implement our business strategy.

If foreign approvals are obtained, we will be subject to additional risks in conducting business in international markets.

Even if we are able to obtain approval for commercialization of a product candidate in a foreign country, we will be subject to additional risks

related to international business operations, including:

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potentially reduced protection for intellectual property rights;

the potential for so-called parallel importing, which is what happens when a local seller, faced with high or higher local prices, opts to
import goods from a foreign market (with low or lower prices) rather than buying them locally;

unexpected changes in tariffs, trade barriers and regulatory requirements;

economic weakness, including inflation, or political instability in particular foreign economies and markets;

workforce uncertainty in countries where labor unrest is more common than in the United States;

production shortages resulting from any events affecting a product candidate and/or finished drug product supply or manufacturing
capabilities abroad;

business interruptions resulting from geo-political actions, including war and terrorism, health epidemics or natural disasters, including
earthquakes, hurricanes, typhoons, floods and fires; and

failure to comply with Office of Foreign Asset Control rules and regulations and the Foreign Corrupt Practices Act.

These and other risks may materially adversely affect our ability to attain or sustain revenue from international markets.

We may engage in acquisitions that could disrupt our business, cause dilution to our stockholders or reduce our financial resources.

In the future, we may enter into transactions to acquire other businesses, products or technologies. If we do identify suitable candidates, we may not

be able to make such acquisitions on favorable terms, or at all. Any acquisitions we make may not strengthen our competitive position, and these
transactions may be viewed negatively by investors. We may decide to incur debt in connection with an acquisition or issue our common stock or other
equity securities to the stockholders of the acquired company, which would reduce the percentage ownership of our existing stockholders. We could incur
losses resulting from undiscovered liabilities of the acquired business that are not covered by the indemnification we may obtain from the seller. In
addition, we may not be able to successfully integrate the acquired personnel, technologies and operations into our existing business in an effective, timely
and nondisruptive manner. Acquisitions may also divert management attention from day-to-day responsibilities, increase our expenses and reduce our cash
available for operations and other uses. We cannot predict the number, timing or size of future acquisitions or the effect that any such transactions might
have on our operating results.

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Risks Related to Our Common Stock

The price of our common stock may be volatile and fluctuate substantially, which could result in substantial losses for our stockholders.

Our stock price may be volatile. The stock market in general and the market for smaller pharmaceutical and biotechnology companies in particular

have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. As a result of this volatility, our
stockholders may not be able to sell their shares at or above the price they paid for their shares. The market price for our common stock may be influenced
by many factors, including:

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the success of existing or new competitive products or technologies;

the timing of clinical trials of our product candidates;

results of clinical trials of tebipenem HBr and any other product candidate;

failure or discontinuation of any of our development programs;

results of clinical trials of product candidates of our competitors;

regulatory or legal developments in the United States and other countries;

the perception of the pharmaceutical and biotechnology industry by the public, legislatures, regulators and the investment community;

developments or disputes concerning patent applications, issued patents or other proprietary rights;

the recruitment or departure of key personnel;

the level of expenses related to any of our product candidates or clinical development programs;

the results of our efforts to develop, in-license or acquire additional product candidates or products;

actual or anticipated changes in estimates as to financial results or development timelines;

announcement or expectation of additional financing efforts;

sales of our common stock by us, our insiders or other stockholders;

variations in our financial results or those of companies that are perceived to be similar to us;

changes in estimates or recommendations by securities analysts, if any, that cover our stock;

changes in the structure of healthcare payment systems;

market conditions in the pharmaceutical and biotechnology sectors;

general economic, industry and market conditions; and

the other factors described in this “Risk Factors” section.

In addition, the stock market has experienced significant volatility, particularly with respect to pharmaceutical, biotechnology and other life sciences
company stocks. The volatility of pharmaceutical, biotechnology and other life sciences company stocks often does not relate to the operating performance
of the companies represented by the stock. In the past, securities class action litigation has often been initiated against companies following periods of
volatility in their stock price. This type of litigation could result in substantial costs and divert our management’s attention and resources, and could also
require us to make substantial payments to satisfy judgments or to settle litigation.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, our share price and trading
volume could decline.

The trading market for our common stock relies in part on the research and reports that securities or industry analysts publish about us or our

business. If few analysts provide coverage of us, the trading price of our stock would likely decline. If one or more of the analysts covering our business
downgrade our stock or change their opinion of our stock, our share price would likely decline. In addition, if one or more of these analysts cease coverage
of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading
volume to decline.

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We can issue and have issued shares of preferred stock, which may adversely affect the rights of holders of our common stock.

Our amended and restated certificate of incorporation authorizes us to issue up to 10,000,000 shares of preferred stock with designations, rights and

preferences determined from time-to-time by our board of directors. Accordingly, our board of directors is empowered, without stockholder approval, to
issue preferred stock with dividend, liquidation, conversion, voting or other rights superior to those of holders of our common stock. For example, an
issuance of shares of preferred stock could:

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adversely affect the voting power of the holders of our common stock;

make it more difficult for a third party to gain control of us;

discourage bids for our common stock at a premium;

limit or eliminate any payments that the holders of our common stock could expect to receive upon our liquidation; or

otherwise adversely affect the market price or our common stock.

We have in the past issued, and we may at any time in the future issue, shares of preferred stock. In connection with our July 2018 public offering,

we issued 2,220 shares of our Series A Convertible Preferred Stock, or Series A Preferred Stock, to certain affiliates of Biotechnology Value Fund, L.P., or
BVF, each share of which is convertible into 1,000 shares of our common stock, subject to certain ownership restrictions. In November 2018, we entered
into an exchange agreement with BVF to exchange 1,000,000 shares of our common stock previously held by BVF for 1,000 shares of our Series B
Convertible Preferred Stock, or Series B Preferred Stock, each share of which is convertible into 1,000 shares of our common stock, subject to certain
ownership restrictions. In June 2019, BVF converted 500 shares of Series A Preferred Stock into 500,000 shares of our common stock pursuant to BVF’s
rights under the certificate of designation for such Series A Preferred Stock. In December 2020, BVF converted the remaining 1,720 shares of Series A
Preferred Stock into 1,720,000 shares of our common stock pursuant to BVF’s rights under the certificate of designation for such Series A Preferred Stock.
In connection with our rights offering, which we launched in February 2020 and closed in early March 2020, we issued 2,287 shares of our Series C
Preferred Stock to BVF. In September 2020, in connection with our underwritten public offering, we issued 3,215,000 shares of our Series D Preferred
Stock to BVF. If BVF or any other future holders of our shares of preferred stock convert their shares into common stock, existing holders of our common
stock will experience dilution.

We have broad discretion in the use of our cash reserves and may not use them effectively.

Our management will have broad discretion in the application of our cash reserves and could spend these funds in ways that do not improve our

results of operations or enhance the value of our common stock. The failure by our management to apply these funds effectively could result in financial
losses that could have a material adverse effect on our business, cause the price of our common stock to decline and delay the development of our product
candidates. Pending their use, we may invest our cash reserves in a manner that does not produce income or that loses value.

We are an “emerging growth company,” and the reduced disclosure requirements applicable to emerging growth companies may make our common
stock less attractive to investors.

We are an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and may remain an
emerging growth company for up to five years. We would cease to be an emerging growth company upon the earlier of: (i) the last day of the fiscal year in
which we have total annual gross revenue of $1.07 billion or more; (ii) the last day of the fiscal year following the fifth anniversary of the date of the
completion of our initial public offering, which is December 31, 2022; (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt
during the previous three years; or (iv) the date on which we are deemed to be a large accelerated filer under the rules of the SEC which means the first day
of the year following the first year in which the market value of our common stock that is held by non-affiliates exceeds $700.0 million as of June 30th. For
so long as we remain an emerging growth company, we are permitted and intend to rely on exemptions from certain disclosure requirements that are
applicable to other public companies that are not emerging growth companies. These exemptions include not being required to comply with the auditor
attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended, or Sarbanes-Oxley, reduced disclosure obligations regarding
executive compensation and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval
of any golden parachute payments not previously approved. We cannot predict whether investors will find our common stock less attractive if we rely on
these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and
our stock price may be more volatile.

In addition, the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new

or revised accounting standards. This allows an emerging growth company to delay the adoption of certain accounting standards until those standards
would otherwise apply to private companies. We have irrevocably elected not to avail ourselves of this exemption and we will therefore be subject to the
same new or revised accounting standards as other public companies that are not emerging growth companies. As a result, changes in rules of United States
generally accepted accounting principles or their interpretation, the adoption of new guidance or the application of existing guidance to changes in our
business could significantly affect our financial position and results of operations.

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We are subject to Section 404 of The Sarbanes-Oxley Act of 2002, or Section 404, and the related rules of the SEC, which generally require our
management and independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting. Beginning
with our next annual report that we will be required to file with the SEC, Section 404 requires an annual management assessment of the effectiveness of our
internal control over financial reporting. However, for so long as we remain an emerging growth company as defined in the JOBS Act, or a "smaller
reporting company" (SRC) and non-accelerated filer, we intend to take advantage of certain exemptions from various reporting requirements, including, but
not limited to, not being required to comply with the auditor attestation requirements of Section 404. Once we are no longer an emerging growth company
and otherwise do not meet the definition of a SRC and non-accelerated filer or, if prior to such date, we opt to no longer take advantage of the applicable
exemption, we will be required to include an opinion from our independent registered public accounting firm on the effectiveness of our internal controls
over financial reporting. We could qualify as a SRC if the market value of our common stock held by non-affiliates is below $250 million (or $700 million
if our annual revenue is less than $100 million) as of June 30 in any given year.

We have incurred and will continue to incur increased costs as a result of operating as a public company, and our management will be required to
devote substantial time to new compliance initiatives and corporate governance practices.

As a public company, and particularly after we are no longer an “emerging growth company,” we incur significant legal, accounting and other

expenses that we did not incur as a private company. Sarbanes-Oxley, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing
requirements of The Nasdaq Global Select Market and other applicable securities rules and regulations impose various requirements on public companies,
including establishment and maintenance of effective disclosure and financial controls and corporate governance practices. Our management and other
personnel devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations have increased our legal and financial
compliance costs and have made some activities more time-consuming and costly. For example, these rules and regulations have made it more difficult and
more expensive for us to obtain director and officer liability insurance, which could make it more difficult for us to attract and retain qualified members of
our board of directors. These rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity, and, as a result,
their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing
uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices.

Failure to maintain effective internal controls in accordance with Section 404 of Sarbanes-Oxley in the future could have a material adverse effect on
our ability to produce accurate financial statements and on our stock price.

Section 404 of Sarbanes-Oxley requires us, on an annual basis, to review and evaluate our internal controls. To maintain compliance with
Section 404, we are required to document and evaluate our internal control over financial reporting, which is both costly and challenging. We will need to
continue to dedicate internal resources, continue to engage outside consultants and follow a detailed work plan to continue to assess and document the
adequacy of internal control over financial reporting, continue to improve control processes as appropriate, validate through testing that controls are
functioning as documented and implement a continuous reporting and improvement process for internal control over financial reporting. If we identify one
or more material weaknesses, it could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our financial
statements.

A significant portion of our total outstanding shares may be sold into the market in the near future, which could cause the market price of our common
stock to decline significantly, even if our business is doing well.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the perception in the

market that the holders of a large number of shares of common stock intend to sell shares, could reduce the market price of our common stock. Our
outstanding shares of common stock may be freely sold in the public market at any time to the extent permitted by Rules 144 and 701 under the Securities
Act of 1933, as amended, or the Securities Act, or to the extent that such shares have already been registered under the Securities Act and are held by non-
affiliates of ours. Moreover, holders of a substantial number of shares of our common stock have rights, subject to conditions, to require us to file
registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. We
also have registered all shares of common stock that we may issue under our equity compensation plans or that are issuable upon exercise of outstanding
options. These shares can be freely sold in the public market upon issuance and once vested, subject to volume limitations applicable to affiliates. If any of
these additional shares are sold, or if it is perceived that they will be sold, in the public market, the market price of our common stock could decline.

We do not anticipate paying any cash dividends on our capital stock in the foreseeable future. Accordingly, stockholders must rely on capital
appreciation, if any, for any return on their investment.

We have never declared or paid cash dividends on our capital stock. We currently intend to retain all of our future earnings, if any, to finance the
operation, development and growth of our business. To the extent that we enter into any future debt agreements, the terms of such agreements may also
preclude us from paying dividends. As a result, capital appreciation, if any, of our common stock will be our stockholders’ sole source of gain for the
foreseeable future.

72

 
Our executive officers, directors and principal stockholders maintain the ability to control all matters submitted to stockholders for approval.

As of December 31, 2020, our executive officers and directors, combined with our stockholders who as of such date owned more than 5% of our

outstanding common stock, in the aggregate, beneficially own shares representing approximately 45% of our capital stock. As a result, if these stockholders
were to choose to act together, they would be able to control all matters submitted to our stockholders for approval, as well as our management and affairs.
For example, these persons, if they choose to act together, would control the election of directors and approval of any merger, consolidation or sale of all or
substantially all of our assets. This concentration of ownership control may:

•

•

•

delay, defer or prevent a change in control;

entrench our management and/or our board of directors; or

impede a merger, consolidation, takeover or other business combination involving us that other stockholders may desire.

Provisions in our corporate charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders,
more difficult and may prevent attempts by our stockholders to replace or remove our current management.

Provisions in our amended and restated certificate of incorporation and amended and restated by-laws may discourage, delay or prevent a merger,

acquisition or other change in control of us that our stockholders may consider favorable, including transactions in which our stockholders might otherwise
receive a premium for their shares. These provisions could also limit the price that investors might be willing to pay in the future for shares of our common
stock, thereby depressing the market price of our common stock. In addition, because our board of directors is responsible for appointing the members of
our management team, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making
it more difficult for stockholders to replace members of our board of directors. Among other things, these provisions:

•

•

•

•

•

•

•

•

establish a classified board of directors such that all members of the board are not elected at one time;

allow the authorized number of our directors to be changed only by resolution of our board of directors;

limit the manner in which stockholders can remove directors from our board of directors;

establish advance notice requirements for nominations for election to our board of directors or for proposing matters that can be acted on
at stockholder meetings;

require that stockholder actions must be effected at a duly called stockholder meeting and prohibit actions by our stockholders by written
consent;

limit who may call a special meeting of stockholders;

authorize our board of directors to issue preferred stock without stockholder approval, which could be used to institute a “poison pill” that
would work to dilute the stock ownership of a potential hostile acquirer, effectively preventing acquisitions that have not been approved
by our board of directors; and

require the approval of the holders of at least 75% of the votes that all of our stockholders would be entitled to cast to amend or repeal
certain provisions of our certificate of incorporation or by-laws.

Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law,

or the DGCL, which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of
three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or
combination is approved in a prescribed manner. This could discourage, delay or prevent someone from acquiring us or merging with us, whether or not it
is desired by, or beneficial to, our stockholders.

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In addition, our amended and restated certificate of incorporation, to the fullest extent permitted by law, provides that the Court of Chancery of the

State of Delaware will be the exclusive forum for: any derivative action or proceeding brought on our behalf; any action asserting a breach of fiduciary
duty; any action asserting a claim against us arising pursuant to the DGCL, our amended and restated certificate of incorporation, or our amended and
restated bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine. This exclusive forum provision does not apply to
suits brought to enforce a duty or liability created by the Exchange Act. It could apply, however, to a suit that falls within one or more of the categories
enumerated in the exclusive forum provision and asserts claims under the Securities Act, inasmuch as Section 22 of the Securities Act creates concurrent
jurisdiction for federal and state courts over all suits brought to enforce any duty or liability created by the Securities Act or the rule and regulations
thereunder. There is uncertainty as to whether a court would enforce such provision with respect to claims under the Securities Act, and our stockholders
will not be deemed to have waived our compliance with the federal securities laws and the rules and regulations thereunder.

This choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or

any of our directors, officers, or other employees, which may discourage lawsuits with respect to such claims. Alternatively, if a court were to find the
choice of forum provisions contained in our restated certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional
costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations and financial condition.

Provisions in our charter and other provisions of Delaware law could limit the price that investors are willing to pay in the future for shares of our

common stock.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Our headquarters are located in Cambridge, Massachusetts, where we lease approximately 23,400 square feet of office space. Our lease extends

through July 2027. We believe that our existing facilities will be sufficient to meet our current needs.

Item 3. Legal Proceedings.

We are not party to any material legal proceedings.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market Information

Our common stock has been publicly traded on The Nasdaq Global Select Market under the symbol “SPRO” since the initial public offering of our

common stock on November 2, 2017. Prior to that time, there was no public market for our common stock.

Holders of Record

As of March 8, 2021, we had approximately nine stockholders of record of our common stock. The actual number of stockholders is greater than

this number of record holders and includes stockholders who are beneficial owners but whose shares are held in street name by brokers and other nominees.

Dividends

We have never declared or paid cash dividends on our capital stock since our inception. We currently intend to retain all available funds and future

earnings, if any, for use in the operation of our business and do not anticipate paying any cash dividends on our common stock in the foreseeable future.
Any future determination to declare and pay dividends will be made at the discretion of our board of directors and will depend on various factors, including
applicable laws, our results of operations, our financial condition, our capital requirements, general business conditions, our future prospects and other
factors that our board of directors may deem relevant. Additionally, our ability to pay dividends on our capital stock could be limited by terms and
covenants of any future indebtedness.

Purchases of Equity Securities by the Issuer

None.

Item 6. Selected Financial Data.

Not applicable.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial
statements and related notes appearing elsewhere in this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis
or set forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and strategy for our business, includes forward-
looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the “Risk Factors” section of this
Annual Report on Form 10-K, our actual results could differ materially from the results described in, or implied by, the forward-looking statements
contained in the following discussion and analysis.

Overview

We are a multi-asset, clinical-stage biopharmaceutical company focused on identifying, developing and commercializing treatments in high unmet
need areas involving MDR bacterial infections and rare diseases. Our most advanced product candidate, tebipenem HBr, is designed to be the first broad-
spectrum oral carbapenem-class antibiotic for use in adults to treat MDR Gram-negative infections. Treatment with effective orally administrable
antibiotics may prevent hospitalizations for serious infections and enable earlier, more convenient and cost-effective treatment of patients after
hospitalization. We are also developing SPR720, a novel oral antibiotic designed for the treatment of a rare, orphan disease caused by non-tuberculous
mycobacterial pulmonary infections, or NTM disease. In addition, we have a Potentiator technology, which includes an IV-administered product candidate,
SPR206, being developed to treat MDR Gram-negative infections in the hospital. We believe that our novel product candidates, if successfully developed
and approved, would have a meaningful patient impact and significant commercial applications for the treatment of MDR infections in both the community
and hospital settings. Since our inception in 2013, we have focused substantially all of our efforts and financial resources on organizing and staffing our
company, business planning, raising capital, acquiring and developing product and technology rights, building our intellectual property portfolio and
conducting research and development activities for our product candidates. We do not have any products approved for sale and have not generated any
revenue from product sales.

We have experienced net losses and significant cash outflows from cash used in operating activities since our inception.  Our ability to generate
product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our
product candidates. As of December 31, 2020, we had an accumulated deficit of $277.7 million, and cash, cash equivalents and marketable securities of
$126.9 million. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years. Based on our current
plans, we believe that our existing cash, cash equivalents and marketable securities, together with the committed funding from our existing BARDA
contract and other non-dilutive funding commitments, will enable us to fund our operating expenses and capital expenditure requirements into the second
quarter of 2022, including through the submission of the NDA for tebipenem HBr. This timeline is subject to uncertainty as to the timing of future
expenditures. We have developed plans to mitigate this risk, which primarily consist of raising additional capital through some combination of equity or
debt financings, potential new collaborations, additional grant funding and/or reducing cash expenditures. If we are not able to secure adequate additional
funding, we plan to make reductions in spending. In that event, we may have to delay, scale back, or eliminate some or all of our planned clinical trials and
research stage programs. The actions necessary to reduce spending under this plan at a level that mitigates the factors described above is not considered
probable, as defined in the accounting standards and therefore, the full extent to which management may extend our funds through these actions may not be
considered in management’s assessment of our ability to continue as a going concern. As a result, management has concluded that substantial doubt exists
about our ability to continue as a going concern.

We will not generate revenue from product sales unless and until we successfully complete clinical development and obtain regulatory approval for
our product candidates. If we obtain regulatory approval for any of our product candidates and do not enter into a commercialization partnership, we expect
to incur significant expenses related to developing our internal commercialization capability to support product sales, marketing and distribution. Further,
we expect to incur additional costs associated with our continued operation as a public company.

As a result, we will need substantial additional funding to support our continuing operations and pursue our growth strategy. Until such time as we

can generate significant revenue from product sales, if ever, we expect to finance our operations through a combination of equity offerings, debt financings,
government funding arrangements, collaborations, strategic alliances and marketing, distribution or licensing arrangements. We may be unable to raise
additional funds or enter into such other agreements or arrangements when needed on favorable terms, or at all. If we fail to raise capital or enter into such
agreements as, and when, needed, we may have to significantly delay, scale back or discontinue the development and commercialization of one or more of
our product candidates.

76

 
 
 
 
 
 
Because of the numerous risks and uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing

or amount of increased expenses or when or if we will be able to achieve or maintain profitability. Even if we are able to generate product sales, we may
not become profitable. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to continue our
operations at planned levels and be forced to reduce or terminate our operations.

Recent Developments

Business Update regarding COVID-19

The spread of SARS-CoV-2, and the resulting disease COVID-19 in 2020, has caused an economic downturn on a global scale, as well as
widespread business disruptions and significant volatility in the financial markets. In March 2020, the World Health Organization declared COVID-19 a
pandemic. In response to the pandemic, we implemented and have maintained a remote working policy for all employees to aid the global containment
effort.

Update on Phase 2a Clinical Trial

On February 5, 2021, we announced that the FDA informed us that a clinical hold had been placed on our Phase 2a clinical trial of SPR720,
following our notification to the FDA of our decision to pause dosing in our ongoing Phase 2a clinical trial of SPR720 as a precautionary measure related
to events in our ongoing animal toxicology study of SPR720. The decision to implement the pause was made based on a recommendation from the
Company’s Safety Review Board, or SRB, following review of data from an ongoing toxicology study of SPR720 in adult non-human primates in which
mortalities with inconclusive causality to treatment were observed.

The animal study is being conducted to assess the potential toxicity of SPR720. A concurrent study of SPR720 in rats is proceeding uneventfully.
These studies are meant to support longer-term treatment with SPR720 beyond the 28 days currently supported by IND-enabling toxicology studies. No
serious adverse events have been observed in any human study participants.

Subsequent to receiving verbal notification from the FDA of the clinical hold, we received a formal clinical hold letter in which the FDA has
requested additional information from the non-human primate trial, including a study report. We have decided to discontinue the Phase 2a clinical trial at
this time to best facilitate future potential adjustments to the protocol based on FDA feedback and to avoid incurring costs associated with the trial while on
clinical hold. We are continuing to work with the FDA to evaluate the findings and determine the further development pathway for the SPR720 clinical
program.

Components of Our Results of Operations

Grant Revenue

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sale of products in the
foreseeable future. If our development efforts for our product candidates are successful and result in regulatory approval, we may generate revenue in the
future from product sales. We cannot predict if, when, or to what extent we will generate revenue from the commercialization and sale of our product
candidates. We may never succeed in obtaining regulatory approval for any of our product candidates.

To date, the majority of our revenue has been derived from government awards. We expect that our revenue for the next few years will be derived

primarily from payments under our government awards that we have currently entered into and that we may enter into in the future.

Collaboration Revenue

Collaboration revenue relates to our agreement with Everest.

77

 
 
 
 
 
 
 
 
 
 
 
 
Operating Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our research activities, including our drug discovery efforts, and the

development of our product candidates, which include:

•

•

•

•

•

•

employee-related expenses, including salaries, related benefits, travel and share-based compensation expense for employees engaged in
research and development functions;

expenses incurred in connection with the preclinical and clinical development of our product candidates, including under agreements with
contract research organizations, or CROs;

costs incurred in connection with our government awards;

the cost of consultants and contract manufacturing organizations, or CMOs, that manufacture drug products for use in our preclinical
studies and clinical trials;

facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities, insurance
and supplies; and

payments made under third-party licensing agreements.

We have recorded research and development expenses conducted by our Australian subsidiary net of a 43.5% research and development tax

incentive we expect to receive for qualified expenses from the Australian government.

In June 2019, we entered into a collaboration with Gates MRI, a nonprofit research institution wholly owned by the Bill and Melinda Gates
Foundation to develop SPR720 for the treatment of lung infections caused by Mtb. In furtherance of the Gates MRI’s charitable purposes, we also granted
the Gates MRI a no cost, exclusive license to develop, manufacture and commercialize SPR720 for the treatment of TB in low- and middle- income
countries. Gates MRI will conduct and fund preclinical and clinical studies for the development of SPR720 against TB and fund certain agreed upon
collaborative research activities performed by us. Due to our assessment that we do not have a vendor/customer relationship with the Gates MRI, we
recognize the funding received under the agreement as a reduction to the research and development expenses as the related expenses are incurred.

We expense research and development costs as incurred. Nonrefundable advance payments we make for goods or services to be received in the
future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered
or the services are performed.

Our direct research and development expenses are tracked on a program-by-program basis and consist primarily of external costs, such as fees paid

to consultants, contractors, CMOs and CROs in connection with our preclinical and clinical development activities. License fees and other costs incurred
after a product candidate has been designated and that are directly related to the product candidate are included in direct research and development
expenses for that program. License fees and other costs incurred prior to designating a product candidate are included in early stage research programs. We
do not allocate employee costs, costs associated with our preclinical programs or facility expenses, including depreciation or other indirect costs, to specific
product development programs because these costs are deployed across multiple product development programs and, as such, are not separately classified.

Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical

development, primarily due to the increased size and duration of later-stage clinical trials.

At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and

clinical development of any of our product candidates. The successful development and commercialization of our product candidates is highly uncertain.
This is due to the numerous risks and uncertainties, including the following:

•

•

•

successful completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable
foreign regulatory authority, including on account of the disruptive impacts of the COVID-19 pandemic;

receipt of marketing approvals from applicable regulatory authorities;

establishment of arrangements with third-party manufacturers to obtain manufacturing supply;

78

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

•

•

•

•

obtainment and maintenance of patent, trade secret protection and regulatory exclusivity, both in the United States and internationally,
including our ability to maintain our license agreement with Meiji with respect to tebipenem HBr;

protection of our rights in our intellectual property portfolio;

launch of commercial sales of tebipenem HBr and our other product candidates, if approved, whether alone or in collaboration with
others;

acceptance of tebipenem HBr and our other product candidates, if approved, by patients, the medical community and third-party payors;

competition with other therapies; and

a continued acceptable safety profile of tebipenem HBr and our other product candidates, if approved.

A change in the outcome of any of these variables with respect to the development of any of our product candidates would significantly change the
costs and timing associated with the development of that product candidate. We may never succeed in obtaining regulatory approval for any of our product
candidates.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries and related costs, including share-based compensation, for personnel in executive,
finance and administrative functions. General and administrative expenses also include direct and allocated facility-related costs as well as professional fees
for legal, patent, consulting, investor and public relations, accounting and audit services. We anticipate that our general and administrative expenses will
increase in the foreseeable future as we increase our headcount to support our continued research, development, and commercialization of our product
candidates. We also anticipate that we will incur increased accounting, audit, legal, regulatory, compliance, infrastructure, and director and officer insurance
costs as well as investor and public relations expenses associated with our continued operation as a public company.

Other Income (Expense)

Anti-Dilution Rights. In connection with the issuance of non-controlling interests in certain of our subsidiaries, specifically Spero Gyrase, Inc., we

granted the minority investors the right to maintain ownership interests at no additional cost, subject to a maximum ownership percentage, which rights we
refer to collectively as anti-dilution rights. We classified the anti-dilution rights as derivative liabilities on our consolidated balance sheet that we
remeasured to fair value at each reporting date, and we recognized changes in the fair value of the derivative liabilities associated with the anti-dilution
rights as a component of other income (expense) in our consolidated statement of operations and comprehensive loss. In November 2019, we repurchased
100% of the minority investor’s outstanding shares in Spero Gyrase, Inc. at a price of $0.001 per share. As a result, as of December 31, 2020 and 2019,
there are no anti-dilution rights outstanding. Additionally, effective as of January 1, 2020, we merged Spero Gyrase, Inc. with and into Spero, Therapeutics,
Inc.

Interest Income

Interest income consists of interest earned on our cash equivalents, which are primarily invested in money market accounts, as well as interest

earned on our investments in marketable securities that we held during the years ended December 31, 2020 and 2019. 

Other Income (Expense), Net

Other income (expense), net, consists of insignificant amounts of miscellaneous income, as well as realized and unrealized gains and losses from

foreign currency-denominated cash balances, vendor payables and receivables from the Australian research and development tax incentive.

Income Taxes

Since our inception, we have not recorded any income tax benefits for the net losses we have incurred in each year or for our earned research and

development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our net operating loss
carryforwards and tax credits will not be realized. As of December 31, 2020, we had federal and state net operating loss carryforwards of $228.1 million
and $226.2 million, respectively, which may be available to offset future income tax liabilities.  The federal NOLs of $73.0 million will expire at various
dates from 2033 to 2037 and approximately $155.1 million can be carried forward indefinitely.  The state NOLs begin to expire in 2033 and will expire at
various dates through 2039. In addition, as of December 31, 2020, we had foreign net operating loss carryforwards of $10.7 million, which may be
available to offset future income tax liabilities and do not expire. As of December 31, 2020, we also had federal and state research and development tax
credit carryforwards of $6.7 million and $1.4 million, respectively, which begin to expire in 2033 and 2028, respectively. We have recorded a full valuation
allowance against our net deferred tax assets at each balance sheet date.

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Critical Accounting Policies and Significant Judgments and Estimates

Our consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States, or GAAP. The

preparation of our consolidated financial statements and related disclosures requires us to make estimates, assumptions and judgments that affect the
reported amount of assets, liabilities, revenue, costs and expenses, and related disclosures. We base our estimates on historical experience, known trends
and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments
about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an
ongoing basis. Our actual results may differ from these estimates under different assumptions or conditions.

We believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our financial

statements.

Funding Received from Government Contracts and Collaborations

Since our inception, we have been able to obtain partial funding for our research and development activities from government contracts, government
tax incentives and a collaboration arrangement. The classification within our statement of operations and comprehensive loss of the funding received under
these arrangements is subject to management judgment based on the nature of the arrangements we enter into, the source of the funding and whether the
funding is considered central to our business operations.

Government Contracts

We generate revenue from government contracts that reimburse us for certain allowable costs for funded projects. For contracts with government
agencies, when we have concluded that we are the principal in conducting the research and development expenses and where the funding arrangement is
considered central to our ongoing operations, we classify the recognized funding received as revenue. Revenue from government grants is recognized as
the qualifying expenses related to the contracts are incurred, provided that there is reasonable assurance of recoverability. Revenue recognized upon
incurring qualifying expenses in advance of receipt of funding is recorded as unbilled receivables, a component of prepaid expenses and other current
assets, in the consolidated balance sheet.

We recognize funding received from BARDA, the DoD and the NIAID of the NIH, as revenue, rather than as a reduction of research and
development expenses, because we are the principal in conducting the research and development activities and these contracts are central to our ongoing
operations. We recognize revenue only after the qualifying expenses related to the contracts have been incurred, we are reasonably assured that the
expenses will be reimbursed and the revenue is collectible. We record revenue recognized upon incurring qualifying expenses in advance of billing as
unbilled revenue, which is included in other receivables in our consolidated balance sheet. The related costs incurred by us are included in research and
development expense in our consolidated statements of operations and comprehensive loss.

Collaboration Agreements

For collaboration agreements with a third party, to determine the appropriate statement of operations classification of the recognized funding, we
first assess whether the collaboration arrangement is within the scope of the accounting guidance for collaboration arrangements. If it is, we evaluate the
collaborative arrangement for proper classification in the statement of operations based on the nature of the underlying activity and we assess the payments
to and from the collaborative partner. If the payments to and from the collaborative partner are not within the scope of other authoritative accounting
guidance, we base the statement of operations classification for the payments received on a reasonable, rational analogy to authoritative accounting
guidance, applied in a consistent manner. Conversely, if the collaboration arrangement is not within the scope of accounting guidance for collaboration
arrangements, we assess whether the collaboration arrangement represents a vendor/customer relationship. If the collaborative arrangement does not
represent a vendor/customer relationship, we then classify the funding payments received in the statement of operations and comprehensive loss as a
reduction of the related expense that is incurred.

In June 2019, we entered into a collaboration agreement with the Gates MRI and concluded that the agreement is within the scope of the accounting

guidance for collaboration arrangements. Due to the cost-funded nature of the payments and our assessment that we do not have a vendor/customer
relationship with the Gates MRI, we will recognize the funding received under the agreement as a reduction to research and development expense as we
incur the related expenses.

80

 
 
 
 
 
 
 
Accrued Research and Development Expenses

As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued research and development
expenses. This process involves reviewing open contracts and purchase orders, communicating with our applicable personnel to identify services that have
been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been
invoiced or otherwise notified of actual costs. The majority of our service providers invoice us in arrears for services performed, on a pre-
determined schedule or when contractual milestones are met; however, some require advance payments. We make estimates of our accrued expenses as of
each balance sheet date in the consolidated financial statements based on facts and circumstances known to us at that time. We periodically confirm the
accuracy of the estimates with the service providers and make adjustments if necessary. Examples of estimated accrued research and development expenses
include fees paid to:

•

•

•

•

vendors in connection with the preclinical development activities;

CMOs in connection with the production of preclinical and clinical trial materials;

CROs in connection with preclinical and clinical studies; and

investigative sites in connection with clinical trials.

We base our expenses related to preclinical studies and clinical trials on our estimates of the services received and efforts expended pursuant to

quotes and contracts with multiple research institutions and CROs that conduct and manage preclinical studies and clinical trials on our behalf. The
financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be
instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the expense. In accruing service
fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the
performance of services or the level of effort varies from the estimate, we adjust the accrual or prepaid expense accordingly. Although we do not expect our
estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual
status and timing of services performed may vary and may result in reporting amounts that are too high or too low in any particular period. To date, there
have not been any material adjustments to our prior estimates of accrued research and development expenses.

Share-Based Compensation

We measure all share-based awards granted to employees and directors based on the fair value on the date of grant using the Black-Scholes option-

pricing model, and we recognize compensation expense of those awards over the requisite service period, which is generally the vesting period of the
respective award. Generally, we issue awards with only service-based vesting conditions and record the expense for these awards using the straight-line
method. The Black-Scholes option-pricing model uses as inputs the fair value of our common stock and assumptions we make for the volatility of our
common stock, the expected term of our common stock options and performance-based awards, the risk-free interest rate for a period that approximates the
expected term of our common stock options and performance-based awards, and our expected dividend yield.

Results of Operations

Our financial statements have been presented on the basis that we are a going concern, which contemplates the realization of revenues and the

satisfaction of liabilities in the normal course of business. We have incurred losses from the inception of our operations. These factors raise substantial
doubt about our ability to continue as a going concern.

81

 
 
 
 
 
 
 
 
 
 
 
Comparison of the Years Ended December 31, 2020 and 2019

The following table summarizes our results of operations for the years ended December 31, 2020 and 2019:

Year Ended December 31,
2019
2020

$ Change

Revenues:

Grant revenue
Collaboration revenue
Total revenues

Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense):

Gain on settlement of derivative liability
Interest income
Other income (expense), net

Total other income (expense), net

Net loss

Grant Revenue

BARDA Contract (Tebipenem HBr)
NIAID Contract (SPR206)
NIAID Award (SPR720)
DoD Agreement (Potentiator product candidates)

Total revenue

  $

9,072    $
258   

9,330 

13,405    $
4,742   
18,147 

67,003   
21,440   
88,443   
(79,113)  

-   
401   
432   
833   
(78,280)   $

65,775   
15,588   
81,363   
(63,216)  

223   
1,328   
740   
2,291   
(60,925)   $

(4,333)
(4,484)
(8,817)

1,228 
5,852 
7,080 
(15,897)

(223)
(927)
(308)
(1,458)
(17,355)

Year Ended December 31,
2019
2020

$ Change

7,929 
719 
40 
384 
9,072 

 $

 $

12,082 
1,021 
77 
225 
13,405 

 $

 $

(4,153)
(302)
(37)
159 
(4,333)

  $

  $

  $

Grant revenue recognized during 2020 and 2019 consisted of the reimbursement of qualifying expenses incurred in connection with our various

government awards. The decrease in revenue during 2020 was primarily due to decreased funding received under our BARDA contract for tebipenem HBr.

Collaboration Revenue

During the years December 31, 2020 and 2019, we recognized $0.3 million and $4.7 million of revenue, respectively, related to our agreement with

Everest, consisting of the performance of research and development services.

Research and Development Expenses

Direct research and development expenses by program:

Tebipenem HBr
SPR720
Potentiator product candidates (SPR206 and SPR741)

Unallocated expenses:

Personnel related (including share-based compensation)
Facility related and other

Total research and development expenses

Year Ended December 31,
2019
2020

$ Change

  $

  $

 $

41,923 
3,816 
1,626 

15,014 
4,624 
67,003 

 $

 $

43,440 
3,741 
3,617 

10,967 
4,010 
65,775 

 $

(1,517)
75 
(1,991)

4,047 
614 
1,228

82

 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
  
  
 
 
  
  
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
 
 
 
  
  
 
 
  
  
 
 
  
  
  
  
  
 
 
  
  
 
 
  
  
 
 
Direct costs related to our tebipenem HBr program decreased by $1.5 million during 2020 compared to 2019 primarily due to the completion of

significant activities and related costs of the Phase 3 clinical trial in 2020. We initiated enrollment for the phase 3 clinical trial in the first quarter of 2019,
completed enrollment in the second quarter of 2020 and announced results of topline data in September 2020. This decrease was partially offset by
increases in expenses related to formulation development, manufacturing process and manufacturing of clinical trial material in 2020 compared to 2019.
We expect to continue to incur direct costs related to tebipenem HBr as we finalize activities in the Phase 3 clinical trial and incur expenses related to a
potential NDA filing for tebipenem HBr.

Direct costs related to our SPR720 program increased by $0.1 million during 2020 compared to 2019, primarily due to increased expenses related to

the initiation of our Phase 2a clinical trial, offset by decreased costs related to the formulation development, manufacturing process and manufacturing of
clinical trial material. Direct costs related to our SPR720 program during the year ended December 31, 2020 reflect a $2.1 million reduction to expense
related to activities funded by Gates MRI, compared to $1.7 million during the year ended December 31, 2019. On February 5, 2021, we announced that
the FDA informed us that a clinical hold had been placed on our Phase 2a clinical trial of SPR720, which is further described elsewhere in this
“Management’s Discussion and Analysis of Financial Condition and Results of Operations” section of our Annual Report on Form 10-K under the heading
“Recent Developments – Update on Phase 2a Clinical Trial.”

Direct costs related to our Potentiator product candidates include costs related to our SPR206 and SPR741 programs. Direct costs related to our

SPR206 program decreased by $2.0 million during 2020, primarily due to higher costs incurred in the prior year related to the Phase 1 trial. Direct costs
related to our SPR741 program were immaterial for both the years ended December 31, 2020 and 2019. In January 2020, we decided to proceed with
SPR206 as the lead Potentiator product candidate and discontinue development of SPR741.

During 2020 and 2019, research and development expenses conducted by our Australian subsidiary were recorded net of a 43.5% research and

development tax incentive for qualified expenses from the Australian government, resulting in a receivable of $1.2 million.

The increase in personnel-related costs included in unallocated expenses of $4.0 million was primarily due to an increase in research and

development headcount and a $0.6 million increase in share-based compensation.

The increase in facility-related and other costs was primarily due to the increased costs of supporting a larger research and development staff.

General and Administrative Expenses

Personnel related (including share-based compensation)
Professional and consultant fees
Facility related and other

Total general and administrative expenses

Year Ended December 31,
2019
2020

$ Change

  $

  $

10,661 
8,271 
2,508 
21,440 

 $

 $

8,050 
5,849 
1,689 
15,588 

 $

 $

2,611 
2,422 
819 
5,852

The increase in personnel-related costs of $2.6 million was primarily a result of an increase in headcount in our general and administrative function.

Personnel-related costs for the years ended December 31, 2020 and 2019 included share-based compensation expense of $2.7 million and $2.2 million,
respectively.

The increase in professional and consultant fees of $2.4 million primarily related to increased commercial operations expenses, as well as increased

IT, HR and Finance contractor and consulting expenses related to supporting the growth in our business.

The increase in facility-related and other costs was primarily due to the increased costs of supporting a larger number of general and administrative

personnel.

Other Income (Expense), Net

Other income, net was $0.8 million during 2020, compared to $2.3 million during 2019. Other income, net in the year ended December 31, 2020

was primarily comprised of unrealized foreign currency gains, offsetting decreased interest income due to falling interest rates. In comparison, other
income, net, for the year ended December 31, 2019 consisted of other income of $2.1 million, which was primarily related to interest income on our
invested cash balances and marketable securities, as well as $0.2 million in connection with the repurchase of Vaxart Inc.’s outstanding shares in Spero
Gyrase, Inc. at a price of $0.001 per share.

83

 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
  
  
 
 
 
 
 
 
 
Liquidity and Capital Resources

Since our inception, we have incurred significant operating losses. We have recognized limited revenue to date from funding arrangements with the

DoD, NIAID, CARB-X and BARDA and our license agreement with Everest. We have not yet commercialized any of our product candidates and we do
not expect to generate revenue from sales of any product candidates for several years, if at all. To date, we have funded our operations with proceeds from
the sales of preferred units and bridge units, payments received under license and collaboration agreements and funding from government contracts, and
from multiple equity financings of our common and preferred stock. As of December 31, 2020, we had cash, cash equivalents and marketable securities of
$126.9 million.

On September 15, 2020, we completed an underwritten public offering of an aggregate of 4,785,000 shares of our common stock and 3,215,000
shares of our Series D Preferred Stock. The price to the public in the offering was $10.00 per share with respect to the common stock and the Series D
Preferred Stock. In addition, under the terms of the Underwriting Agreement, we granted the underwriters an option, exercisable for 30 days, to purchase
up to 1,200,000 additional shares of common stock.

The shares of Series D Preferred Stock are convertible on a one-to-one basis into shares of common stock at any time at the option of the holder,

provided that the holder will be prohibited from converting the Series D Preferred Stock into shares of common stock if, as a result of such conversion, the
holder, together with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to
certain exceptions. In the event of the Company’s liquidation, dissolution, or winding up, holders of Series D Preferred Stock will receive a payment equal
to $0.001 per share of Series D Preferred Stock before any proceeds are distributed to the holders of common stock and equal to any distributions to the
holders of Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock. Shares of Series D Preferred Stock will generally have no
voting rights, except as required by law and except that the consent of holders of a majority of the then outstanding Series D Preferred Stock will be
required to amend the terms of the Series D Preferred Stock. As such, we have classified the Series D Convertible Preferred Stock within permanent equity
in its consolidated balance sheet.

The offering closed on September 15, 2020 with an aggregate public offering price of $80.0 million. Aggregate net proceeds from the offering were

$74.7 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

In addition, pursuant to the Underwriting Agreement, on October 1, 2020, we issued and sold 1,200,000 shares of common stock at the price of

$10.00 per share pursuant to the underwriters’ exercise of their option to purchase additional shares of common stock, resulting in additional net proceeds
of approximately $11.2 million after deducting underwriting discounts and commissions.

On February 11, 2020, the Company announced a rights offering pursuant to which it distributed to holders of its common stock and Series A
Preferred Stock and Series B Preferred Stock, at no charge, non-transferable subscription rights to purchase shares of our common stock and Series C
Preferred Stock, with an aggregate offering value of $30.0 million. For each share of common stock (including shares of common stock issuable upon
conversion of our outstanding shares of Series A Preferred Stock and Series B Preferred Stock) owned by holders of record as of 5:00 p.m., New York
time, on February 10, 2020, such holders received 0.152 rights to purchase shares of our common stock (subject to the aggregate offering threshold and
certain ownership limitations). Each whole right allowed holders to subscribe for one share of common stock at the subscription price equal to $9.00 per
whole share (or an equivalent number of shares of Series C Preferred Stock). The total number of subscription rights issued to each stockholder was
rounded down to the nearest whole number.

Any participant in the rights offering that, following exercise of such participant’s subscription right, would be or become a holder of greater than

9.99% of the outstanding number of shares of the Company’s common stock following the offering could elect to instead purchase Series C Preferred Stock
at a purchase price of $9,000 per share (ratably adjusted for fractional shares), and any such holder so electing had a right to purchase one one-
thousandth of a share of Series C Preferred Stock for each share of common stock it had a right to purchase under the subscription rights. Each share of
Series C Preferred Stock is convertible into 1,000 shares of our common stock at the election of the holder, subject to beneficial ownership conversion
limits applicable to the Series C Preferred Stock. The Series C Preferred Stock generally have no voting rights, except as required by law, and participate
pari passu (on an as-converted basis) with any distribution of proceeds to holders of common stock and Series A Preferred Stock and Series B Preferred
Stock, in the event of the Company’s liquidation, dissolution or winding up or the payment of a dividend on the common stock.

At the closing of the rights offering on March 5, 2020, a total of 1,046,249 shares of our common stock and 2,287 shares of Series C Preferred Stock

were issued for aggregate gross proceeds of $30.0 million. Issuance costs related to the offering were $0.5 million.

On December 3, 2018, we filed a universal shelf registration statement on Form S-3 (Registration No. 333-228661) with the SEC, which was

declared effective on December 11, 2018, and pursuant to which we registered for sale up to $200.0 million of any combination of our common stock,
preferred stock, debt securities, warrants, rights and/or units from time to time and at prices and on terms that we may determine, including up to $50.0
million of our common stock available for issuance pursuant to an “at-the-market” offering program sales agreement that we entered into with Cantor
Fitzgerald & Co, or Cantor. Under the sales agreement, Cantor may sell shares of our common stock by any method permitted by law deemed to be an “at
the market,” or ATM, offering as defined in Rule 415 of the Securities Act, subject to the terms of the sales agreement.

84

 
 
 
 
 
 
 
 
The prospectus underlying the “at-the-market” offering program was terminated on September 9, 2020 in connection with our underwritten public
offering that was completed in September 2020. At such time, we had raised approximately $15.4 million in sales of our common stock under the “at-the-
market” offering program, prior to deducting sales commissions, and had remaining available capacity of approximately $34.6 million. On November 13,
2020, we reinstated the “at-the-market” offering program with a capacity of up to $34 million by filing an updated prospectus.

During the year ended December 31, 2020, we sold 993,870 shares of our common stock under the “at-the-market” agreement at an average price of

approximately $13.66 per share for aggregate gross proceeds of approximately $13.6 million prior to deducting sales commissions.

Concurrently with the filing of this Annual Report on Form 10-K, we entered into a new sales agreement with Cantor and will file a new universal

shelf registration statement on Form S-3, including an “at-the-market” prospectus with the SEC, which is further described elsewhere in this Annual Report
on Form 10-K under “Item 9B. Other Events.” Our existing sales agreement with Cantor will terminate automatically at such time as the SEC declares
effective our new universal shelf registration statement on Form S-3.

The COVID-19 pandemic has resulted in ongoing volatility in financial markets. If our access to capital is restricted or associated borrowing costs

increase as a result of developments in financial markets relating to the COVID-19 pandemic, our operations and financial condition could be adversely
impacted.

Cash Flows

The following table summarizes our sources and uses of cash for the years ended December 31, 2020 and 2019:

Cash used in operating activities
Cash provided by (used in) investing activities
Cash provided by financing activities

Net increase (decrease) in cash and cash equivalents

Operating Activities

Year Ended December 31,

2020

2019

  $

  $

(85,872)  $
10,470 
130,881 
55,479 

 $

(50,020)
29,530 
16,140 
(4,350)

Net cash used in operating activities for the year ended December 31, 2020 was $85.9 million, primarily resulting from our net loss of $78.3 million,
adjusted for net non-cash items of $5.9 million (primarily stock-based compensation and depreciation and amortization expense). Net cash used in changes
in our operating assets and liabilities was $(13.5) million and consisted primarily of a decrease of $12.1 million in accrued expenses and accounts payable,
a $1.9 million increase in other assets and a $1.2 million increase in prepaid expenses and other current assets, partially offset by a $2.2 million net
decrease in receivables related to our government awards.

Net cash used in operating activities for the year ended December 31, 2019 was $50.0 million, primarily resulting from our net loss of $60.9 million,

adjusted for net non-cash items of $4.1 million (primarily stock-based compensation and depreciation and amortization expense). Net cash provided by
changes in our operating assets and liabilities was $6.8 million and consisted primarily of an increase of $13.8 million in accrued expenses and accounts
payable and a $2.7 million decrease in prepaid expenses and other current assets, offset by a $7.1 million increase in receivables related to our government
awards and a $2.9 million increase in other assets.

Changes in accounts payable, accrued expenses and other current liabilities, and prepaid expenses and other current assets in all periods were

generally due to the advancement of our development programs and the timing of vendor invoicing and payments.

Investing Activities

Net cash provided by investing activities for the year ended December 31, 2020 was $10.5 million, primarily related to the maturities of marketable

securities of $56.4 million, offset by purchases of marketable securities of $45.7 million.

Net cash provided by investing activities for the year ended December 31, 2019 was $29.5 million and consisted primarily of the net maturities of

marketable securities, as well as $0.3 million in property and equipment purchases.

85

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
Financing Activities

Net cash provided by financing activities for the year ended December 31, 2020 was $130.9 million, consisting primarily of proceeds of $116.5

million from the sale of common stock, Series C Preferred Stock and Series D Preferred Stock in our rights offering and underwritten public offering, net
proceeds of $13.2 million from the sale of common stock under our “at-the-market” offering program sales agreement and proceeds of $2.2 million from
the exercise of employee stock options, offset by the payment of offering expenses of approximately $1.0 million.

Net cash provided by financing activities for the year ended December 31, 2019 was $16.1 million, consisting primarily of net proceeds of $5.8

million from the sale of common stock under our “at-the-market” offering program sales agreement, proceeds of $10.0 million from the sale of common
stock to Novo, both of which were offset by offering expenses of $0.2 million, as well as $0.5 million of proceeds from the exercise of employee stock
options.

Funding Requirements

We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance our clinical programs and

prepare for possible commercialization of one or more of our product candidates. In addition, we expect to incur additional costs associated with our
continued operation as a public company. The timing and amount of our operating expenditures will depend largely on:

•

•

•

•

•

•

•

•

•

•

•

•

the timing and costs of our ongoing and planned clinical trials;

the initiation, progress, timing, costs and results of preclinical studies and clinical trials of our other product candidates and potential new
product candidates;

the amount of funding that we receive under government contracts that we have applied for;

the number and characteristics of product candidates that we pursue;

the outcome, timing and costs of seeking regulatory approvals;

the costs of commercialization activities for tebipenem HBr and other product candidates if we receive marketing approval, including the
costs and timing of establishing product sales, marketing, distribution and manufacturing capabilities;

the receipt of marketing approval and revenue received from any potential commercial sales of tebipenem HBr;

the terms and timing of any future collaborations, licensing or other arrangements that we may establish;

the amount and timing of any payments we may be required to make, or that we may receive, in connection with the licensing, filing,
prosecution, defense and enforcement of any patents or other intellectual property rights, including milestone and royalty payments and
patent prosecution fees that we are obligated to pay pursuant to our license agreements;

the costs of preparing, filing and prosecuting patent applications, maintaining and protecting our intellectual property rights and defending
against any intellectual property related claims;

the costs of operating as a public company; and

the extent to which we in-license or acquire other products and technologies.

As of December 31, 2020, we had cash, cash equivalents and marketable securities of $126.9 million. In accordance with Accounting Standards
Update, or ASU, 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), we are required to
evaluate whether there are conditions and events, considered in the aggregate, that raise substantial doubt about our ability to continue as a going concern
from the issuance date of our financial statements. Based on our current plans, we believe that our existing cash, cash equivalents and marketable securities,
together with the committed funding from our existing BARDA contract and other non-dilutive funding commitments, will enable us to fund our operating
expenses and capital expenditure requirements into the second quarter of 2022, including through the submission of the NDA for tebipenem HBr.

86

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
This timeline is subject to uncertainty as to the timing of future expenditures. We have developed plans to mitigate this risk, which primarily consist
of raising additional capital through some combination of equity or debt financings, potential new collaborations, additional grant funding and/or reducing
cash expenditures. If we are not able to secure adequate additional funding, we plan to make reductions in spending. In that event, we may have to delay,
scale back, or eliminate some or all of our planned clinical trials, research stage programs and commercial activities. The actions necessary to reduce
spending under this plan at a level that mitigates the factors described above is not considered probable, as defined in the accounting standards and
therefore, the full extent to which management may extend our funds through these actions may not be considered in management’s assessment of our
ability to continue as a going concern. As a result, management has concluded that substantial doubt exists about our ability to continue as a going concern.

We have based these estimates on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we

expect. Because of the numerous risks and uncertainties associated with research, development and commercialization of pharmaceutical product
candidates, we are unable to estimate the exact amount of our working capital requirements. Our future funding requirements will depend on and could
increase significantly as a result of many factors, including those listed above.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our operations through a combination of equity
offerings, debt financings, government funding, collaborations, strategic alliances and marketing, distribution or licensing arrangements. To the extent that
we raise additional capital through the sale of equity or convertible debt securities, our stockholders’ ownership interests will be diluted, and the terms of
these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing and preferred
equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring
additional debt, making acquisitions or capital expenditures or declaring dividends. If we raise additional funds through collaborations, strategic alliances
or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue
streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. The COVID-19 pandemic has resulted in
ongoing volatility in financial markets. If our access to capital is restricted or associated borrowing costs increase as a result of developments in financial
markets, including relating to the COVID-19 pandemic, our operations and financial condition could be adversely impacted. If we are unable to raise
additional funds through equity or debt financings or other arrangements when needed, we may be required to delay, limit, reduce or terminate our
research, product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer
to develop and market ourselves.

Contractual Obligations and Commitments

The following table summarizes our contractual obligations as of December 31, 2020 and the effects that such obligations are expected to have on

our liquidity and cash flows in future periods:

Payments Due by Period

Total

  Less Than 1 Year  

1 to 3 Years
(in thousands)

4 to 5 Years

More than 5
Years

Operating lease commitments (1)
Total

  $

10,876     
10,876    $

947     
947    $

3,352     
3,352    $

3,464     
3,464    $

3,113 
3,113

(1)

Reflects payments due for our lease of office space under an operating lease agreement that expires in 2027.

As further described below, under various licensing and related agreements with third parties, we have agreed to make milestone payments and pay

royalties to third parties. We have not included any contingent payment obligations, such as milestones or royalties, in the table above as the amount,
timing and likelihood of such payments are not known.

Under our license agreement with Meiji, we are obligated (i) to make future milestone payments of up to $2.0 million upon the achievement of
specified clinical and regulatory milestones for tebipenem HBr, (ii) to pay royalties, on a product-by-product and country-by-country basis, of a low single-
digit percentage based on net sales of products licensed under the agreement and (iii) to pay to Meiji a low double-digit percentage of any sublicense fees
received by us up to $7.5 million. During the fourth quarter of 2018 we paid Meiji approximately $1.6 million related to fixed assets which will be used in
manufacturing related activities at Meiji. The equipment has been capitalized as property and equipment in the consolidated balance sheet as of December
31, 2020 and 2019.

Under an agreement we entered into with PBB, we are obligated to make milestone payments of up to $5.8 million upon the achievement of
specified clinical milestones and a payment of £5.0 million ($6.8 million as of December 31, 2020) upon the achievement of a specified commercial
milestone for SPR206. In addition, we have agreed to pay to PBB royalties, on a product-by-product and country-by-country basis, of a low single-digit
percentage based on net sales of products licensed under the agreement.

87

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
Under our agreement with Vertex, we are obligated to make future milestone payments of up to $80.2 million upon the achievement of specified

clinical, regulatory and commercial milestones and to pay to Vertex tiered royalties, on a product-by-product and country-by-country basis, of a mid single-
digit to low double-digit percentage based on net sales of products licensed under the agreement. During the year ended December 31, 2020, we paid
Vertex $0.9 million related to the achievement of regulatory milestones for SPR720.

We enter into contracts in the normal course of business with CROs, CMOs and other third parties for clinical trials, preclinical research studies and
testing, manufacturing and other services. These contracts are cancelable by us upon prior notice. Payments due upon cancellation consist only of payments
for services provided or expenses incurred, including non-cancellable obligations of our service providers, up to the date of cancellation. These payments
are not included in the table of contractual obligations and commitments above.

Off-Balance Sheet Arrangements

We did not have during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined in the rules and

regulations of the SEC.

Recently Adopted Accounting Pronouncements

Please refer to Note 2 to our consolidated financial statements included in Part II, Item 8, “Financial Statements and Supplementary Data,” of this

Annual Report on Form 10-K for a description of recent accounting pronouncements applicable to our business.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

As of December 31, 2020, we had cash, cash equivalents and marketable securities of $126.9 million, consisting of cash, money market accounts,

corporate bonds, commercial paper and United States government debt securities. The primary objectives of our investment activities are to preserve
principal, provide liquidity and maximize income without significantly increasing risk. Our primary exposure to market risk is interest income sensitivity,
which is affected by changes in the general level of United States interest rates. If market interest rates were to increase immediately and uniformly by 50
basis points, from levels as of December 31, 2020, the net fair value of our interest sensitive marketable securities would hypothetically decline by $0.1
million. As we incur research expenses in foreign countries, we face exposure to movements in foreign currency exchange rates, primarily the Euro, British
Pound and Australian dollar against the United States dollar. Historically, foreign currency fluctuations have not had a material impact on our consolidated
financial statements.

88

 
 
 
 
 
 
 
 
 
 
Item 8. Financial Statements and Supplementary Data.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm
Consolidated Balance Sheets
Consolidated Statements of Operations and Comprehensive Loss
Consolidated Statements of Convertible Preferred Shares and Stockholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

Page
90
91
92
93
94
95

89

 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of Spero Therapeutics, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Spero Therapeutics, Inc. and its subsidiaries (the “Company”) as of December 31, 2020
and 2019, and the related consolidated statements of operations and comprehensive loss, of convertible preferred shares and stockholders’ equity and of
cash flows for the years then ended, including the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the
consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the
results of its operations and its cash flows for the years then ended in conformity with accounting principles generally accepted in the United States of
America.

Substantial Doubt about the Company’s Ability to Continue as a Going Concern

The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in
Note 1 to the consolidated financial statements, the Company has incurred recurring losses since inception and has an accumulated deficit that raise
substantial doubt about its ability to continue as a going concern. Management's plans in regard to these matters are also described in Note 1. The
consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s
consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board
(United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits of these consolidated financial statements in accordance with the standards of the PCAOB. Those standards require that we plan
and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to
error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our
audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the
effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or
fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and
disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by
management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis
for our opinion.

/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
March 11, 2021  

We have served as the Company's auditor since 2016.

90

 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

CONSOLIDATED BALANCE SHEETS
(In thousands, except unit, share and per share amounts)

December 31,
2020

December 31,
2019

Assets
Current assets:

Cash and cash equivalents
Marketable securities
Other receivables
Tax incentive receivable, current
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Tax incentive receivable
Operating lease right-of-use assets
Other assets

Total assets

Liabilities and Stockholders' Equity
Current liabilities:

Accounts payable
Accrued expenses and other current liabilities
Operating lease liabilities
Total current liabilities

Non-current operating lease liabilities
Other long-term liabilities

Total liabilities

Commitments and contingencies (Note 12)
Stockholders' equity:

Preferred stock, $0.001 par value; 10,000,000 shares authorized, 3,218,287 shares issued and
outstanding as of December 31, 2020 and 2,720 shares issued and outstanding as of December 31,
2019
Common stock, $0.001 par value; 60,000,000 shares authorized as of December 31, 2020 and
December 31, 2019; 29,260,247 shares issued and outstanding as of December 31, 2020 and
19,190,695 shares issued and outstanding as of December 31, 2019
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive gain (loss)

Total stockholders' equity

Total liabilities and stockholders' equity

  $

  $

  $

  $

85,209    $
41,697   
5,330   
846   
6,063   
139,145   
1,669   
311   
7,114   
5,212   
153,451    $

1,155    $
12,241   
947   
14,343   
6,891   
177   
21,411   

29,730 
52,315 
7,760 
786 
4,823 
95,414 
2,273 
21 
4,875 
3,520 
106,103 

4,147 
21,588 
928 
26,663 
4,617 
249 
31,529 

3   

— 

29   
409,722   
(277,707)  
(7)  
132,040   
153,451    $

19 
273,966 
(199,427)
16 
74,574 
106,103

The accompanying notes are an integral part of these consolidated financial statements.

91

 
 
 
 
   
 
 
 
   
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
(In thousands, except share and per share data)

Revenues:

Grant revenue
Collaboration revenue
Total revenues

Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense):

Gain on settlement of derivative liability
Interest income
Other income (expense), net

Total other income (expense), net

Net loss

Net loss per share attributable to common stockholders, basic and diluted

Weighted average common shares outstanding, basic and diluted:

Comprehensive loss:
Net loss

Other comprehensive gain (loss):

Unrealized gain (loss) on marketable securities
Reclassification adjustment for gains included in net loss

Net unrealized gains (losses) on securities

Total comprehensive loss

Year Ended December 31,

2020

2019

 $

9,072 
258 
9,330 

67,003 
21,440 
88,443 
(79,113)

— 
401 
432 
833 
(78,280)

 $

13,405 
4,742 
18,147 

65,775 
15,588 
81,363 
(63,216)

223 
1,328 
740 
2,291 
(60,925)

(3.52)

 $

(3.35)

22,386,122 

18,160,525 

(78,280)

(23)
— 
(23)
(78,303)

 $

(60,925)

38 
6 
44 
(60,881)

$

$

$

$

The accompanying notes are an integral part of these consolidated financial statements.

92

 
 
 
 
 
 
 
 
 
 
 
   
 
    
 
 
 
 
  
 
 
  
 
 
 
  
  
  
 
 
  
  
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
  
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
  
  
  
 
 
 
 
  
  
  
 
 
  
 
 
 
  
  
  
 
   
 
    
 
 
 
  
 
 
 
 
  
 
 
  
  
 
 
  
  
  
 
 
 
 
 
SPERO THERAPEUTICS, INC.
CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED SHARES AND
STOCKHOLDERS’ EQUITY
(In thousands, except unit and share amounts)

  Additional

  Accumulated  

  Accumulated  
Other
Comprehensive  

Stockholders'

    Spero Therapeutics, Inc. 

Non-

Total

Common Stock

Shares
  17,205,962  

  Par Value  
17  

Paid-in

Capital

Deficit

Income (Loss)  

Equity (Deficit)

254,013  

(138,502 )  

(28 )  

115,500  

controlling   Stockholders'  
  Equity (Deficit) 
115,855  

Interests

355  

Balances at December 31, 2018

Issuance of common stock upon the
exercise of stock options
Issuance of common stock, net of
issuance costs of $474
Conversion of convertible preferred
stock to common stock
Share-based compensation expense
Purchase of non-controlling interest
in Spero Gyrase, Inc.
Unrealized gain on available-for-
sale securities
Net loss
Balances at December 31, 2019

Issuance of common stock upon the
exercise of stock options
Issuance of common stock, net of
offering costs of $731 and net of
issuance costs
Issuance of Series C preferred stock,
net of offering costs of $41
Beneficial conversion feature of
Series C  preferred stock
Deemed dividends related to
immediate accretion of beneficial
conversion feature of Series C
preferred stock
Issuance of Series D preferred
stock, net of offering costs of $181
Conversion of convertible preferred
stock to common stock
Share-based compensation expense
Unrealized loss on available-for-sale
securities
Net loss
Balances at December 31, 2020

Series A, B, C and D
Convertible Preferred
Stock

Shares

  Par Value  
—  

3,220  

—  

—  

(500 )  
—  

—  

—  
—  
2,720  

—  

—  

2,287  

—  

—  

—  
—  

—  

—  
—  
—  

—  

—  

—  

—  

(549 )  

—  

549  

78,610  

1,406,123  

500,000  
—  

—  

—  
—  
  19,190,695  

324,433  

8,025,119  

—  

—  

—  

—  

3,215,000  

(1,720 )  
—  

—  
—  
3,218,287  

3  

—  
—  

—  
—  
3  

1,720,000  
—  

—  
—  
  29,260,247  

—  

1  

1  
—  

—  

—  
—  
19  

—  

8  

—  

—  

—  

—  

2  
—  

—  
—  
29  

508  

15,315  

(1 )  

3,776  

355  

—  
—  
273,966  

2,189  

77,921  

20,542  

549  

(549 )  

30,218  

(2 )  

4,888  

—  
—  
409,722  

—  

—  

—  
—  

—  

—  

(60,925 )  
(199,427 )  

—  

—  

—  

—  

—  

—  

—  
—  

—  

(78,280 )  
(277,707 )  

—  

—  

—  
—  

—  

44  
—  
16  

—  

—  

—  

—  

—  

—  

—  
—  

(23 )  
—  
(7 )  

508  

15,316  

—  
3,776  

355  

44  

(60,925 )  
74,574  

2,189  

77,929  

20,542  

—  

—  

30,221  

—  
4,888  

(23 )  
(78,280 )  
132,040  

—  

—  

—  
—  

(355 )  

—  
—  
—  

—  

—  

—  

—  

—  

—  

—  
—  

—  
—  
—  

508  

15,316  

—  
3,776  

—  

44  
(60,925 )
74,574  

2,189  

77,929  

20,542  

—  

—  

30,221  

—  
4,888  

(23 )
(78,280 )
132,040  

The accompanying notes are an integral part of these consolidated financial statements.

93

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
   
 
   
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
   
 
 
   
 
 
 
 
   
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)

Cash flows from operating activities:
Net loss

Adjustments to reconcile net loss to net cash used in operating activities:

Year Ended December 31,
2019
2020

  $

(78,280)   $

(60,925)

Depreciation and amortization
Non-cash lease cost
Loss on disposal of fixed assets
Gain on settlement of derivative liability
Share-based compensation
Realized (gain) loss on investments
Unrealized foreign currency transaction (gain) loss
Accretion of discount on marketable securities

Changes in operating assets and liabilities:

Other receivables
Prepaid expenses and other current assets
Tax incentive receivables
Other assets
Accounts payable
Accrued expenses and other current liabilities
Other long-term liabilities
Operating lease liabilities

Net cash used in operating activities

Cash flows from investing activities:

Purchases of marketable securities
Proceeds from maturities of marketable securities
Purchases of property and equipment
Net cash provided by investing activities

Cash flows from financing activities:

Proceeds from the issuance of common stock, net of commissions
Proceeds from the issuance of common stock related to Rights Offering
Proceeds from the issuance of common stock related to the Underwritten Public Offering
Proceeds from issuance of Series C Preferred Shares related to Rights Offering
Proceeds from issuance of Series D Preferred Shares related to the Underwritten Public Offering
Payment of offering costs
Proceeds from stock option exercises
Net cash provided by financing activities
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period

Supplemental disclosure of non-cash activities:
Right-of-use assets and lease obligations recorded upon commencement or amendment of lease agreements

  $

  $

The accompanying notes are an integral part of these consolidated financial statements.

94

761   
585   
—   
—   
4,888   
—   
(330)  
(32)  

2,430   
(1,240)  
(254)  
(1,890)  
(2,975)  
(9,130)  
(72)  
(333)  
(85,872)  

(45,723)  
56,350   
(157)  
10,470   

13,166   
9,416   
56,078   
20,583   
30,402   
(953)  
2,189   
130,881   
55,479   
29,730   
85,209    $

750 
408 
184 
(223)
3,776 
(1)
(18)
(750)

(7,384)
2,654 
299 
(2,912)
564 
13,272 
(52)
338 
(50,020)

(88,993)
118,837 
(314)
29,530 

15,790 
— 
— 
— 
— 
(158)
508 
16,140 
(4,350)
34,080 
29,730 

2,626    $

1,038

 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
 
 
 
    
   
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Nature of the Business and Basis of Presentation

Spero Therapeutics, Inc., together with its consolidated subsidiaries (the “Company” or “Spero”), is a multi-asset, clinical-stage biopharmaceutical
company focused on identifying, developing and commercializing treatments in high unmet need areas involving multi-drug resistant, or MDR, bacterial
infections and rare diseases. The Company’s most advanced product candidate, tebipenem pivoxil hydrobromide or tebipenem HBr (previously SPR994), is
designed to be the first oral carbapenem-class antibiotic for use in adults to treat MDR Gram-negative infections. Treatment with effective orally
administrable antibiotics may prevent hospitalizations for serious infections and enable earlier, more convenient and cost-effective treatment of patients
after hospitalization. The Company is also developing SPR720, a novel oral antibiotic designed for the treatment of a rare, orphan disease caused by
pulmonary non-tuberculous mycobacterial infections, or NTM disease. In addition, the Company has a Potentiator technology, that includes an IV-
administered product candidate, SPR206, being developed to treat MDR Gram-negative infections in the hospital.

The Company was formed as Spero Therapeutics, LLC in December 2013 under the laws of the State of Delaware. On June 30, 2017, through a

series of transactions, Spero Therapeutics, LLC merged with and into Spero Therapeutics, Inc. (formerly known as Spero OpCo, Inc.), a Delaware
corporation.

On December 3, 2018, the Company filed a universal shelf registration statement on Form S-3 (Registration No. 333-228661) with the SEC, which

was declared effective on December 11, 2018, and pursuant to which it registered for sale up to $200.0 million of any combination of its common stock,
preferred stock, debt securities, warrants, rights and/or units from time to time and at prices and on terms that we may determine, including up to $50.0
million of our common stock available for issuance pursuant to an “at-the-market” offering program sales agreement that it entered into with Cantor
Fitzgerald & Co., or Cantor. Under the sales agreement, Cantor may sell the shares by any method permitted by law deemed to be an “at the market”
offering as defined in Rule 415 of the Securities Act.

The prospectus underlying the “at-the-market” offering program was terminated on September 9, 2020 in connection with the Company’s
underwritten public offering that was completed in September 2020. At such time, the Company had raised approximately $15.4 million in sales of its
common stock under the “at-the-market” offering program, prior to deducting sales commissions, On November 13, 2020, the Company reinstated the “at-
the-market” offering program for the remaining available capacity of $34.0 million by filing an updated prospectus.

Concurrently with the filing of this Annual Report on Form 10-K, the Company entered into a new sales agreement with Cantor and will be filing a
new universal shelf registration statement on Form S-3, including an “at-the-market” prospectus with the SEC, which is further described elsewhere in this
Annual Report on Form 10-K under “Item 9B. Other Events.” The Company’s existing sales agreement with Cantor will terminate automatically at such
time as the SEC declares effective the Company’s new universal shelf registration statement on Form S-3.

The Company is subject to risks and uncertainties common to companies in the biotechnology industry, including, but not limited to, development

by competitors of new technological innovations, dependence on key personnel, protection of proprietary technology, compliance with government
regulations, risks of failure or unsatisfactory results of nonclinical studies and clinical trials, the need to obtain marketing approval for its product
candidates, the need to successfully commercialize and gain market acceptance of its product candidates and the ability to secure additional capital to fund
operations. The Company’s product candidates will require additional preclinical and clinical testing and regulatory approval prior to commercialization.
These efforts require significant amounts of additional capital, adequate personnel and infrastructure and extensive compliance-reporting capabilities. Even
if the Company’s product development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.
The pandemic caused by COVID-19 has resulted, and is likely to continue to result, in significant national and global economic disruption and may
adversely affect our business. The Company has experienced impacts to its clinical and development timelines due to the worldwide spread of COVID-19.
However, to date, the Company has not experienced material impacts to liquidity, nor has it incurred impairment of any assets as a result of COVID-19.
The Company continues to monitor this situation and the possible effects on its business, results of operations and financial condition, including
manufacturing, clinical trials, research and development costs and employee-related amounts.

The accompanying consolidated financial statements of the Company have been prepared in conformity with accounting principles generally
accepted in the United States of America (“GAAP”) and include the accounts of the Company and its consolidated subsidiaries. All intercompany accounts
and transactions have been eliminated in consolidation.

95

 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Since inception, the Company has funded its operations with proceeds from sales of preferred units (including bridge units, which converted into
preferred units), payments received in connection with a concluded collaboration agreement, funding from government contracts, a licensing agreement
and through the sale of the Company’s common and preferred stock. The Company has incurred recurring losses since inception, including net losses of
$78.3 million and $60.9 million for the years ended December 31, 2020 and 2019, respectively. In addition, as of December 31, 2020, the Company had an
accumulated deficit of $277.7 million. The Company expects to continue to generate operating losses for the foreseeable future.  

In accordance with Accounting Standards Update (“ASU”) 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going
Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt
about the Company’s ability to continue as a going concern within one year after the date that these consolidated financial statements are issued. Based on
the Company’s current operating plan and existing cash, cash equivalents and marketable securities, the Company has determined that there is substantial
doubt regarding its ability to continue as a going concern. The Company will require additional funding to fund the development of its product candidates
through regulatory approval and commercialization, and to support its continued operations. The Company will seek additional funding through public or
private financings, debt financing, collaboration agreements or government grants. The COVID-19 pandemic has resulted in ongoing volatility in financial
markets. If our access to capital is restricted or associated borrowing costs increase as a result of developments in financial markets, including relating to
the COVID-19 pandemic, our operations and financial condition could be adversely impacted. There is no assurance that the Company will be successful in
obtaining sufficient funding on acceptable terms, if at all, and it could be forced to delay, reduce or eliminate some or all of its research and development
programs, product portfolio expansion or commercialization efforts, which could materially adversely affect its business prospects or its ability to continue
operations.

The accompanying consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty.
Accordingly, the consolidated financial statements have been prepared on a basis that assumes the Company will continue as a going concern and which
contemplates the realization of assets and satisfaction of liabilities and commitments in the ordinary course of business.

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported

amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of
expenses during the reporting periods. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not
limited to, revenue recognition, the accrual for clinical trial costs and other research and development expenses, and the valuation of share-based awards.
The full extent to which the COVID-19 pandemic will directly or indirectly impact our business, results of operations and financial condition, including
expenses, manufacturing, clinical trials, research and development costs and employee-related amounts, will depend on future developments that are highly
uncertain, including as a result of new information that may emerge concerning COVID-19 and the actions taken to contain it or treat COVID-19, as well
as the economic impact on local, regional, national and international customers and markets. The Company has contemplated the impact of COVID-19
within its financial statements and is not aware of any specific event or circumstance that would require the Company to update estimates, judgments or
revise the carrying value of any assets or liabilities. There may be changes to those estimates in future periods. On an ongoing basis, management evaluates
its estimates, as there are changes in circumstances, facts and experience. Actual results may differ from those estimates or assumptions.  

Segment Information

The Company manages its operations as a single segment for the purposes of assessing performance and making operating decisions. The

Company’s singular focus is on identifying, developing and commercializing novel treatments for MDR bacterial infections. All of the Company’s tangible
assets are held in the United States.

Consolidation

Ownership interests in the Company’s subsidiaries that are held by entities other than the Company are reported as non-controlling interests in the

consolidated balance sheets. Losses attributed to non-controlling interests and to the Company are reported separately in the consolidated statements of
operations and comprehensive loss.

96

 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

In November 2019, the Company repurchased 100% of the minority investor’s outstanding shares in Spero Gyrase, Inc. for $0.001 per share, and as

a result, as of December 31, 2020 and 2019, the Company no longer reported a non-controlling interest. Additionally, effective as of January 1, 2020, the
Company merged Spero Gyrase, Inc. with and into Spero, Therapeutics, Inc.

Concentrations of Credit Risk and of Significant Suppliers

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The
Company maintains most of its cash and cash equivalents at one accredited financial institution. The Company does not believe that it is subject to unusual
credit risk beyond the normal credit risk associated with commercial banking relationships.

The Company is dependent on third-party manufacturers to supply products for research and development activities in its programs. In particular,

the Company relies and expects to continue to rely on a small number of manufacturers to supply it with its requirements for the active pharmaceutical
ingredients and formulated drugs related to these programs. These programs could be adversely affected by a significant interruption in the supply of active
pharmaceutical ingredients and formulated drugs. As of December 31, 2020, and 2019, the Company had no off-balance sheet risk such as foreign
exchange contracts, option contracts, or other hedging arrangements.

Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.

Cash and cash equivalents include cash held in banks and money market instruments.

Marketable Securities

Marketable securities consist of investments in corporate obligations with original maturities greater than 90 days. The Company considers its

portfolio of investments to be available-for-sale. Accordingly, these investments are recorded at fair value, which is based on quoted market prices.
Investments with maturities beyond one year are generally classified as short term, based on their highly liquid nature and because such marketable
securities represent the investment of cash that is available for current operations. Unrealized gains and losses are reported as a component of accumulated
other comprehensive income (loss) in stockholders’ equity. Realized gains and losses and declines in value are included as a component of other income
(expense), net based on the specific identification method. The Company evaluates debt securities with an unrealized loss to determine whether there may
be a credit impairment. The Company also assesses its intent to sell the security and whether it is more likely than not that the Company will be required to
sell the security prior to recovery of its amortized cost. Any credit impairments are recorded through an allowance account.

Property and Equipment

Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization expense are recognized

using the straight-line method over the estimated useful life of each asset as follows:

Laboratory equipment
Computer software and equipment
Office furniture and equipment
Manufacturing equipment
Leasehold improvements

Estimated Useful Life
5 years
3 years
7 years
5 years
Shorter of life of lease
or 5 years

Costs for capital assets not yet placed into service are capitalized as construction in progress and are depreciated in accordance with the above

guidelines once placed into service. Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation and amortization are
removed from the accounts and any resulting gain or loss is included in loss from operations. Expenditures for repairs and maintenance are charged to
expense as incurred. The Company periodically evaluates whether events and circumstances have occurred that may warrant revision of the estimated
useful life of property and equipment.

97

 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Leases

Effective January 1, 2019, the Company adopted ASC Topic 842, Leases (“ASC 842”), using the modified retrospective approach and utilizing the
effective date as its date of initial application, for which prior periods are presented in accordance with the previous guidance in ASC 840, Leases (“ASC
840”).

At the inception of an arrangement, the Company determines whether the arrangement is or contains a lease based on the unique facts and

circumstances present in the arrangement. Leases with a term greater than one year are recognized on the balance sheet as right-of-use assets and short-term
and long-term lease liabilities, as applicable. The Company has elected not to recognize on the balance sheet leases with terms of one year or less. As of
December 31, 2020, the Company had no short-term leases with terms of one year or less. Options to renew a lease are not included in the Company’s
initial lease term assessment unless there is reasonable certainty that the Company will renew. The Company monitors its plans to renew its material leases
on a quarterly basis.

Operating lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected

remaining lease term. Certain adjustments to the right-of-use asset may be required for items such as incentives received. The interest rate implicit in lease
contracts is typically not readily determinable. As a result, the Company utilizes its incremental borrowing rate (“IBR”), which reflects the fixed rate at
which the Company could borrow on a collateralized basis the amount of the lease payments in the same currency, for a similar term, and in a similar
economic environment. Since the Company does not have any debt and has not been rated by any major credit rating agency, the Company’s IBR was
estimated by developing a synthetic credit rating for the Company. In transitioning to ASC 842, the Company utilized the remaining lease term of its leases
in determining the appropriate incremental borrowing rates.

The Company has elected to account for lease and non-lease components together as a single lease component.

Other Assets

Other assets consist of long-term prepayments and deposits.

Impairment of Long-Lived Assets

Long-lived assets consist of property and equipment and operating lease right-of-use assets. Long-lived assets to be held and used are tested for

recoverability whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable. Factors
that the Company considers in deciding when to perform an impairment review include significant underperformance of the business in relation to
expectations, significant negative industry or economic trends and significant changes or planned changes in the use of the assets. If an impairment review
is performed to evaluate a long-lived asset group for recoverability, the Company compares forecasts of undiscounted cash flows expected to result from
the use and eventual disposition of the long-lived asset group to its carrying value. An impairment loss would be recognized when estimated undiscounted
future cash flows expected to result from the use of an asset group are less than its carrying amount. The impairment loss would be based on the excess of
the carrying value of the impaired asset group over its fair value, determined based on discounted cash flows.

Fair Value Measurements

Certain assets and liabilities are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or

paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market
participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of
unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair
value hierarchy, of which the first two are considered observable and the last is considered unobservable:

•

•

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted
prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by
observable market data.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to determining the fair value of the
assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

98

 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The Company’s cash equivalents are carried at fair value, determined according to the fair value hierarchy described above (see Note 3). The

carrying values of the Company’s accounts payable and accrued expenses approximate their fair values due to the short-term nature of these liabilities.

Collaboration Agreements

For collaboration agreements with a third party, to determine the appropriate statement of operations classification of the recognized funding, the
Company first assesses whether the collaboration arrangement is within the scope of the accounting guidance for collaboration arrangements. If it is, the
Company evaluates the collaborative arrangement for proper classification in the statement of operations based on the nature of the underlying activity and
the Company assesses the payments to and from the collaborative partner. If the payments to and from the collaborative partner are not within the scope of
other authoritative accounting guidance, the Company bases the statement of operations classification for the payments received on a reasonable, rational
analogy to authoritative accounting guidance, applied in a consistent manner. Conversely, if the collaboration arrangement is not within the scope of
accounting guidance for collaboration arrangements, the Company assesses whether the collaboration arrangement represents a vendor/customer
relationship. If the collaborative arrangement does not represent a vendor/customer relationship, the Company then classifies the funding payments
received in the statement of operations and comprehensive loss as a reduction of the related expense that is incurred.

In June 2019, the Company entered into a collaboration agreement with the Bill and Melinda Gates Medical Research Institute (the “Gates MRI”)

and concluded that the agreement is within the scope of the accounting guidance for collaboration arrangements (see Note 14). Due to the cost-funded
nature of the payments and the Company’s assessment that it does not have a vendor/customer relationship with the Gates MRI, the Company recognizes
the funding received under the agreement as a reduction to the research and development expenses incurred, as the related expenses are incurred.

Government Tax Incentives

For available government tax incentives that the Company may earn without regard to the existence of taxable income and that require the Company
to forego tax deductions or the use of future tax credits and net operating loss carryforwards, the Company classifies the funding recognized as a reduction
of the related qualifying research and development expenses incurred.

Since the fourth quarter of 2016, the Company’s operating subsidiary in Australia has met the eligibility requirements to receive a tax incentive for

qualifying research and development activities (see Note 15). The Company recognizes these incentives as a reduction of research and development
expenses in the consolidated statements of operations and comprehensive loss in the same period that the related qualifying expenses are incurred.
Reductions of research and development expense recognized upon incurring qualifying expenses in advance of receipt of tax incentive payments are
recorded in the consolidated balance sheet as tax incentive receivables.

Research and Development Costs

Research and development costs are expensed as incurred. Research and development expenses are comprised of costs incurred in performing

research and development activities, including personnel salaries, share-based compensation and benefits, allocated facilities costs, depreciation,
manufacturing expenses, costs related to the Company’s government contract and grant arrangements, and external costs of outside vendors engaged to
conduct preclinical development activities, clinical trials as well as the cost of licensing technology. Upfront payments and milestone payments made for
the licensing of technology are expensed as research and development in the period in which they are incurred. Advance payments for goods or services to
be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related
goods are delivered or the services are performed.

Clinical Trial and other Research Contract Costs and Accruals

The Company has entered into various research and development contracts with clinical research organizations and other companies both inside and

outside of the United States. These agreements are generally cancelable, and related payments are recorded as research and development expenses as
incurred. There may be instances in which payments made to these vendors exceed the level of service provided and will result in a prepayment of the
expense. The Company records accruals for estimated ongoing research and clinical trial costs based on the services received and efforts expended pursuant
to multiple contracts with these vendors. When evaluating the adequacy of the accrued liabilities, the Company analyzes the progress of the studies or
trials, including the phase or completion of events, invoices received and contracted costs. Significant judgments and estimates are made in determining the
accrued balances at the end of any reporting period. Actual results could differ from the Company’s estimates. The Company’s historical accrual estimates
have not been materially different from the actual costs.

99

 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Patent Costs

All patent-related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about

the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses.

Share-Based Compensation

The Company measures all share-based awards granted to employees and directors based on the fair value on the date of grant using the Black-

Scholes option-pricing model. Compensation expense of those awards is recognized over the requisite service period, which is generally the vesting period
of the respective award. The Company records the expense for awards with service-based conditions using the straight-line method over the requisite
service period, net of any actual forfeitures. The Company has also granted certain awards subject to performance-based vesting eligibility and a
subsequent partial time-based vesting schedule. The Company classifies share-based compensation expense in its consolidated statements of operations and
comprehensive loss in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are
classified.

Comprehensive Loss

Comprehensive loss includes net loss as well as other changes in stockholders’ equity that result from transactions and economic events other than

those with shareholders. For the years ended December 31, 2020 and 2019, these changes related to unrealized gains and losses on the Company’s
available-for-sale marketable securities. There were no reclassifications out of comprehensive loss for the years ended December 31, 2020 and 2019.

Net Loss per Share

The Company follows the two-class method when computing net income (loss) per share, as the Company has issued shares that meet the definition
of participating securities. The two-class method determines net income (loss) per share for each class of common and participating securities according to
dividends declared or accumulated and participation rights in undistributed earnings. The two-class method requires income available to common
stockholders for the period to be allocated between common and participating securities based upon their respective rights to receive dividends as if all
income for the period had been distributed. Net income (loss) per share attributable to common stockholders is calculated based on net income (loss)
attributable to Spero Therapeutics, Inc. and excludes net income (loss) attributable to non-controlling interests.

Basic net income (loss) per share attributable to common stockholders is computed by dividing the net income (loss) attributable to common

stockholders by the weighted average number of shares of common stock outstanding for the period. Diluted net income (loss) attributable to common
stockholders is computed by adjusting net income (loss) attributable to common stockholders to reallocate undistributed earnings based on the potential
impact of dilutive securities. Diluted net income (loss) per share attributable to common stockholders is computed by dividing the diluted net income (loss)
attributable to common stockholders by the weighted average number of common shares outstanding for the period, including potential dilutive common
shares assuming the dilutive effect of common stock equivalents.

Income Taxes

The Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for
the expected future tax consequences of events that have been recognized in the consolidated financial statements or in the Company’s tax returns. Deferred
tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using enacted
tax rates in effect for the year in which the differences are expected to reverse. Changes in deferred tax assets and liabilities are recorded in the provision
for income taxes. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income and, to the extent it
believes, based upon the weight of available evidence, that it is more likely than not that all or a portion of the deferred tax assets will not be realized, a
valuation allowance is established through a charge to income tax expense. Potential for recovery of deferred tax assets is evaluated by estimating the
future taxable profits expected and considering prudent and feasible tax planning strategies.

The Company accounts for uncertainty in income taxes recognized in the consolidated financial statements by applying a two-step process to

determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon
external examination by the taxing authorities. If the tax position is deemed more-likely-than-not to be sustained, the tax position is then assessed to
determine the amount of benefit to recognize in the consolidated financial statements. The amount of the benefit that may be recognized is the largest
amount that has a greater than 50% likelihood of being realized upon ultimate settlement. The provision for income taxes includes the effects of any
resulting tax reserves, or unrecognized tax benefits, that are considered appropriate as well as the related net interest and penalties.

100

 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (CARES Act) was signed into law in March 2020.

The CARES Act lifts certain deduction limitations originally imposed by the Tax Cuts and Jobs Act of 2017 (2017 Tax Act). Corporate taxpayers may
carryback net operating losses (NOLs) originating during 2018 through 2020 for up to five years, which was not previously allowed under the 2017 Tax
Act. The CARES Act also eliminates the 80% of taxable income limitations by allowing corporate entities to fully utilize NOL carryforwards to offset
taxable income in 2018, 2019 or 2020. Taxpayers may generally deduct interest up to the sum of 50% of adjusted taxable income plus business interest
income (30% limit under the 2017 Tax Act) for tax years beginning January 1, 2019 and 2020. The CARES Act allows taxpayers with alternative minimum
tax credits to claim a refund in 2020 for the entire amount of the credits instead of recovering the credits through refunds over a period of years, as
originally enacted by the 2017 Tax Act.

Recently Issued and Adopted Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No 2016-13, Financial

Instruments – Credit Losses (Topic 326). The Accounting Standards Codification 326, Financial Instruments- Credit Losses (“ASC 326”) requires a
financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. Under ASU 2016-13, the Company is required
to use a current expected credit loss (“CECL”) model that immediately recognizes an estimate of credit losses that are expected to occur over the life of the
financial instruments that are in the scope of the update, including trade receivables. The updated guidance also amends the previous other-than-temporary
impairment model for available-for-sale debt securities by requiring the recognition of impairments related to credit losses through an allowance account
and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value.  In addition, the length of time a security
has been in an unrealized loss position no longer impacts the determination of whether a credit loss exists.  The Company adopted the guidance on January
1, 2020 with no impact.  For available-for-sale securities, the updated guidance was applied prospectively.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s
Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues
Task Force) (“ASU 2018-15”). The amendments in ASU 2018-15 align the requirements for capitalizing implementation costs incurred in a hosting
arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and
hosting arrangements that include an internal-use software license). The Company adopted this standard as of January 1, 2020, on a prospective basis. The
adoption did not have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure
Requirements for Fair Value Measurement. This standard modifies certain disclosure requirements on fair value measurements. This standard became
effective for the Company on January 1, 2020 and did not have a material impact on its disclosures. For the new disclosures regarding our Level 3
instruments, please read Note 3, Fair Value Measurements, to these consolidated financial statements.

In November 2018, the FASB issued ASU No. 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and

Topic 606. This standard makes targeted improvements for collaborative arrangements as follows:

•

•

•

Clarifies that certain transactions between collaborative arrangement participants should be accounted for as revenue under Accounting
Standards Codification (ASC) 606, Revenue from Contracts with Customers, when the collaborative arrangement participant is a
customer in the context of a unit of account. In those situations, all the guidance in ASC 606 should be applied, including recognition,
measurement, presentation and disclosure requirements;

Adds unit-of-account guidance to ASC 808, Collaborative Arrangements, to align with the guidance in ASC 606 (that is, a distinct good
or service) when an entity is assessing whether the collaborative arrangement or a part of the arrangement is within the scope of ASC 606;
and

Precludes a company from presenting transactions with collaborative arrangement participants that are not directly related to sales to third
parties with revenue recognized under ASC 606 if the collaborative arrangement participant is not a customer.

This standard became effective for the Company on January 1, 2020 and did not have a material impact on its condensed consolidated financial

statements and related disclosures.

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SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, amended guidance on

the accounting and reporting of income taxes. The guidance is intended to simplify the accounting for income taxes by removing exceptions related to
certain intraperiod tax allocations and deferred tax liabilities; clarifying guidance primarily related to evaluating the step-up tax basis for goodwill in a
business combination; and reflecting enacted changes in tax laws or rates in the annual effective tax rate. The amended guidance is effective for interim and
annual periods in 2021. Early adoption is permitted. The application of the amendments in the new guidance are to be applied on a retrospective basis, on a
modified retrospective basis through a cumulative-effect adjustment to retained earnings or prospectively, depending on the amendment. The Company is
currently evaluating the impact of adoption on its consolidated financial statements.

3. Fair Value Measurements and Marketable Securities

The following tables present information about the Company’s assets and liabilities that are measured at fair value on a recurring basis (in

thousands):

Assets:

Cash equivalents:

Money market funds
Commercial paper
Corporate bonds

Total cash equivalents

Marketable securities:

Corporate bonds
Commercial paper

  $

Total marketable securities

Total cash equivalents and marketable securities

  $

Assets:

Cash equivalents:

Money market funds

Total cash equivalents

Marketable securities:

U.S. government securities
Corporate bonds
Commercial paper

Total marketable securities

  $

Total cash equivalents and marketable securities

  $

Fair Value Measurements at December 31, 2020 Using:

Level 1

Level 2

Level 3

Total

—    $
—     
—     
—     

—     
—     
—     
—    $

73,488    $
5,998     
3,006     
82,492     

13,221     
28,476     
41,697     
124,189    $

—    $
—     
—     
—     

—     
—     
—     
—    $

73,488 
5,998 
3,006 
82,492 

13,221 
28,476 
41,697 
124,189

Fair Value Measurements at December 31, 2019 Using:

Level 1

Level 2

Level 3

Total

—    $
—     

—     
—     
—     
—     
—    $

26,751    $
26,751     

16,797     
14,060     
21,458     
52,315     
79,066    $

—    $
—     

—     
—     
—     
—     
—    $

26,751 
26,751 

16,797 
14,060 
21,458 
52,315 
79,066 

Excluded from the tables above is cash of $2.7 million and $3.0 million as of December 31, 2020 and 2019, respectively. During the years ended

December 31, 2020 and 2019, there were no transfers between Level 1, Level 2 and Level 3 categories.

Marketable Securities

The Company’s marketable securities are classified as Level 2 assets under the fair value hierarchy as these assets were primarily determined from

independent pricing sources, which generally derive security prices from recently reported trades for identical or similar securities. The Company evaluated
debt securities with unrealized losses for any expected credit losses and determined unrealized losses on these securities were related to non-credit factors.
Additionally, the Company currently does not intend to and is not required to sell these investments prior to an anticipated recovery in value. 

102

 
 
 
 
 
 
 
   
   
   
 
   
 
     
 
     
 
     
 
 
     
       
       
       
 
   
   
   
     
       
       
       
 
   
   
   
 
 
 
 
 
 
 
   
   
   
 
   
 
     
 
     
 
     
 
 
     
       
       
       
 
   
     
       
       
       
 
   
   
   
   
 
   
      
      
      
  
 
   
    
 
    
 
    
 
   
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table summarizes the gross unrealized gains and losses of the Company’s marketable securities as of December 31, 2020 and 2019 (in

thousands):

Assets:

U.S. government securities
Corporate bonds
Commercial paper

Assets:

U.S. government securities
Corporate bonds
Commercial paper

Amortized
Cost

December 31, 2020

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair Value

—    $
13,227     
28,476     
41,703    $

—    $
—     
—     
—    $

—    $
(6)    
—     
(6)   $

— 
13,221 
28,476 
41,697

Amortized
Cost

December 31, 2019

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair Value

16,791    $
14,050     
21,458     
52,299    $

6    $
12     
—     
18    $

—    $
(2)    
—     
(2)   $

16,797 
14,060 
21,458 
52,315

  $

  $

  $

  $

As of December 31, 2020 and 2019, all of the Company’s marketable securities had remaining contractual maturity dates of one year or less from

the consolidated balance sheet date.

Anti-Dilution Rights

In connection with the issuance of non-controlling interests in certain of the Company’s subsidiaries (see Note 10), specifically Spero Gyrase, Inc.,

the Company granted anti-dilution rights to the minority investors. The Company classified the anti-dilution rights as a derivative liability on its
consolidated balance sheet because they were freestanding instruments that represent a conditional obligation to issue a variable number of shares. The
Company remeasured the derivative liability associated with the anti-dilution rights to fair value at each reporting date, and recognized changes in the fair
value of the derivative liability as a component of other income (expense) in the consolidated statement of operations and comprehensive loss. The fair
value of these derivative liabilities was determined using a discounted cash flow model.

In March 2016, in connection with the issuance of a non-controlling interest in its subsidiary, Spero Gyrase, Inc. (“Spero Gyrase”), to Biota

Pharmaceuticals, Inc. (now Vaxart, Inc.) (“Vaxart”), the Company granted to Vaxart certain anti-dilution rights (see Note 10). In November 2019, the
Company repurchased 100% of the minority investor’s outstanding shares in Spero Gyrase, Inc. at a price per share of $0.001. As a result, as of December
31, 2020 and 2019, there are no anti-dilution rights outstanding. Additionally, effective as of January 1, 2020, the Company merged Spero Gyrase, Inc. with
and into Spero, Therapeutics, Inc.

103

 
 
 
 
 
 
 
   
   
   
 
   
 
     
 
     
 
     
 
 
   
   
 
 
 
 
 
 
 
 
   
   
   
 
 
   
 
     
 
     
 
     
 
 
   
 
     
 
     
 
     
 
 
   
   
 
 
 
 
    
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

4. Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

Leasehold improvements
Manufacturing equipment
Computer software and equipment
Office furniture and equipment
Construction-in-progress

Less: Accumulated depreciation and amortization

December 31,

2020

2019

1,636     
1,338     
507    $
424     
40     
3,945     
(2,276)    
1,669    $

1,636 
1,338 
438 
364 
12 
3,788 
(1,515)
2,273

  $

  $

Property and equipment additions during the year ended December 31, 2020 primarily related to office furniture and equipment and construction-in-

progress related to the expansion of Company’s leased office space (see Note 5). Property and equipment additions during the year ended December 31,
2019 primarily related to leasehold improvements previously in construction-in-progress. Depreciation and amortization expense was $0.8 million and $0.8
million for the years ended December 31, 2020 and 2019, respectively. During the year ended December 31, 2019, the Company wrote off $0.2 million of
leased manufacturing equipment which the Company determined did not have any further use.

5. Leases

Operating Leases

In August 2015, the Company entered into an operating lease agreement with U.S. REIF Central Plaza Massachusetts, LLC (the “Landlord”) with

respect to its corporate headquarters located at 675 Massachusetts Avenue, Cambridge, Massachusetts (the “Original Lease”). The term of the Original
Lease commenced in January 2016 and was scheduled to expire in December 2020. Under the terms of the Original Lease, the Company provided a
security deposit of $0.2 million to the Landlord, which is included in long-term assets in the accompanying condensed consolidated balance sheets. The
Original Lease provided for annual rent escalations as well as tenant incentives in the amount of $0.7 million, of which $0.3 million would be reimbursed
to the Landlord over the initial term of the Original Lease.

On January 17, 2018, the Company entered into an amendment to the Original Lease (the “Amendment”). The Amendment made certain

modifications to the Original Lease, including the addition of approximately 7,800 square feet of office space in the same building (the “Expansion
Premises”) and an extension of the expiration date of the Original Lease to seven years, or December 2025. The Amendment also provided for $0.4 million
from the Landlord for leasehold improvements on the Expansion Premises.

On December 16, 2019, the Company entered into a second amendment to the Original Lease and the Amendment (the “Second Amendment”). The

Second Amendment made certain modifications, including (i) the addition of approximately 7,800 square feet of office space in the same building (the
“Second Expansion Premises”) with a term beginning in June 2020, and (ii) an extension of the expiration date of all existing leases through May 2027.

Under the Second Amendment, the Company has two consecutive options to extend the Lease Term for an additional period of five years (the

“Option Terms”), subject to certain conditions, upon notice to the Landlord. These renewal options were not included in the calculation of the operating
lease assets and operating lease liabilities, as the renewal is not reasonably certain. The Second Amendment provides for annual base rent for the Second
Expansion Premises of approximately $0.6 million in the first year of the Lease Term, which increases on an annual basis to approximately $0.7 million in
the final year of the Lease Term, and annual base rent during the Option Terms to be calculated based on the Landlord’s good faith determination of 100%
of the fair market rate for such Option Terms. The Company is also obligated to pay the Landlord certain costs, taxes and operating expenses, subject to
certain exclusions. The Amendment also provides for $0.6 million from the Landlord for leasehold improvements on the Expansion Premises.

104

 
 
 
 
 
 
 
   
 
   
   
   
   
 
   
   
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

On May 4, 2020, the Company entered into a third amendment to the Original Lease, as amended by the Second Amendment (the “Third

Amendment”). The Third Amendment made certain modifications, including (i) amending the commencement date of the Second Expansion Premises with
a term which began in August 2020, and (ii) an extension of the expiration date of all existing leases through July 2027.  

For the years ended December 31, 2020 and 2019, the components of operating lease expense were as follows (in thousands):

Operating lease expense
Fixed operating lease expense

  Statement of Operations Location
  Research and development expense
  General and administrative expense

  $

Variable operating lease expense

  Research and development expense
  General and administrative expense

December 31, 2020   

808    $
418     

89     
58     

December 31, 2019 
601 
641 

56 
181 

Total operating lease expense

  $

1,373    $

1,479

Supplemental cash flow information related to the Company’s operating leases for the years ended December 31, 2020 and 2019, was as follows (in

thousands):

Cash paid for amounts included in the measurement of lease liabilities:

Operating cash flows from operating leases

  $

1,171 

 $

1,234 

  December 31, 2020     December 31, 2019  

Non-cash amounts resulting from the measurement of the lease liabilities:
Right-of-use asset and lease obligation recorded upon commencement or
amendment of lease agreements

2,626 

1,038  

Embedded Finance Leases

As part of our agreement with Meiji Seika Pharma Co. Ltd. (“Meiji”), the Company paid Meiji approximately $1.6 million during the three months
ended December 31, 2018, related to fixed assets which will be used in manufacturing related activities at Meiji. The Company determined this equipment
to be an embedded finance lease and has been capitalized as property and equipment in the consolidated balance sheet as of December 31, 2020 and 2019.
As this equipment was fully paid in 2018, there is no corresponding lease liability as of December 31, 2020 or 2019.

105

 
 
 
 
   
   
 
       
 
 
 
   
 
   
   
      
  
   
 
   
 
   
   
      
  
   
 
 
 
 
 
   
 
    
 
 
   
 
    
 
 
 
  
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table presents the lease balances within the consolidated balance sheet, weighted average remaining lease term, and the weighted
average discount rates related to the Company’s operating and finance leases as of December 31, 2020 and 2019 (in thousands, except for the weighted
average remaining lease term and the weighted average discount rate):

Lease Assets and Liabilities
Assets

Operating
Financing

Total leased assets

Liabilities
Current

Operating
Non-Current
Operating

Total lease liabilities

Weighted average remaining lease term (in
years)
Weighted average discount rate

  Classification

December 31, 2020

December 31, 2019

  Operating lease right-of-use assets
  Property and equipment, net

  Operating lease liabilities

  Non-current operating lease liabilities

  $

  $

  $

  $

7,114 
736 
7,850 

  $

  $

947 

  $

6,891 
7,838 

  $

4,875 
1,004 
5,879 

928 

4,617 
5,545 

6.6 
9.8%   

7.0 
10.3%

The following table presents the maturity of the Company’s operating lease liabilities as of December 31, 2020 (in thousands):

Years Ending December 31,
2021
2022
2023
2024
2025
Thereafter
Total future minimum lease payments

Less imputed interest
Total operating lease liabilities

  $

  $

947 
1,662 
1,690 
1,718 
1,746 
3,113 
10,876 
(3,038)
7,838

6. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

Accrued external research and development expenses
Accrued payroll and related expenses
Accrued professional fees
Accrued other

106

  December 31, 2020     December 31, 2019  
17,746 
  $
2,630 
803 
409 
21,588

7,035    $
3,918   
1,066   
222   
12,241    $

  $

 
 
 
 
 
 
   
   
  
  
  
   
  
   
 
   
   
  
  
  
   
   
  
  
  
   
   
  
  
  
   
   
  
  
  
   
  
   
 
   
   
  
  
  
   
   
  
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

7. Equity Transactions

Underwritten Public Offering

On September 15, 2020, the Company completed an underwritten public offering of an aggregate of 4,785,000 shares of its common stock, and an

aggregate of 3,215,000 shares of newly designated Series D Convertible Preferred Stock (“Series D Preferred Stock”). The price to the public in the
offering was $10.00 per share with respect to the common stock and the Series D Preferred Stock. In addition, under the terms of the Underwriting
Agreement, the Company granted the underwriters an option, exercisable for 30 days, to purchase up to 1,200,000 additional shares of common stock.

The offering closed on September 15, 2020 with an aggregate public offering price of $80.0 million. Aggregate net proceeds from the offering were
$74.7 million, after deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. Additionally, pursuant to
the Underwriting Agreement, on October 1, 2020, the Company issued and sold 1,200,000 shares of common stock at the price of $10.00 per share
pursuant to the underwriters’ exercise of their option to purchase additional shares of common stock, resulting in additional net proceeds of approximately
$11.2 million after deducting underwriting discounts and commissions.

Rights Offering

On February 11, 2020, the Company announced a rights offering pursuant to which it distributed to holders of its common stock and Series A
Convertible Preferred Stock (“Series A Preferred Stock”) and Series B Convertible Preferred Stock (“Series B Preferred Stock”), at no charge, non-
transferable subscription rights to purchase shares of Spero common stock and Series C Convertible Preferred Stock (“Series C Preferred Stock”), with an
aggregate offering value of $30.0 million. For each share of common stock (including shares of common stock issuable upon conversion of the Company’s
outstanding shares of Series A Preferred Stock and Series B Preferred Stock) owned by holders of record as of 5:00 p.m., New York time, on February 10,
2020, the holders of such shares received 0.152 rights to purchase shares of Spero common stock (subject to the aggregate offering threshold and certain
ownership limitations). Each whole right allowed holders to subscribe for one share of common stock at the subscription price equal to $9.00 per whole
share (or an equivalent number of shares of Series C Preferred Stock). The total number of subscription rights issued to each stockholder was rounded
down to the nearest whole number.

The Rights Offering was fully backstopped by certain affiliates of BVF Partners L.P. (“BVF”), which agreed to purchase, at a minimum, their

respective as-converted pro rata share of the offered shares under the Rights Offering, plus an additional amount of Common Stock or Series C Preferred
Shares that are not subscribed by other purchasers in the Rights Offering, for a total of up to $30.0 million.

At the closing of the rights offering on March 5, 2020, a total of 1,046,249 shares of the Company’s common stock and 2,287 shares of Series C
Preferred Stock were issued for aggregate gross proceeds of $30.0 million. The aggregate issuance costs related to the offering were $0.5 million. $20.6
million of the aggregate gross proceeds relates to the issuance of Series C and the associated issuance costs are $0.1 million.

Upon issuance, each share of Series C Preferred Stock included an embedded beneficial conversion feature. The beneficial conversion feature arose

because the market price of the Company’s common stock on the date of issuance of the Series C Preferred Stock was $9.22 per share as compared to an
effective conversion price of the Series C Preferred Stock of $8.98 per share. As a result, the Company recorded the intrinsic value of the beneficial
conversion feature of $0.5 million as a discount on the Series C Preferred Stock at issuance. Because the Series C Preferred Stock is immediately
convertible upon issuance and does not include mandatory redemption provisions, the discount on the Series C Preferred Stock was immediately accreted.

8. Equity

Convertible Preferred Shares

Series A Convertible Preferred Shares

The Company has designated 2,220 of the 10,000,000 authorized shares of preferred stock as Series A Convertible Preferred Stock, or the Series

A Preferred Stock

107

 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Each share of Series A Preferred Stock is convertible into 1,000 shares of common stock at any time at the option of the holder, provided that the

holder will be prohibited from converting the Series A Preferred Stock into shares of common stock if, as a result of such conversion, the holder, together
with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to certain exceptions. In
the event of the Company’s liquidation, dissolution, or winding up, holders of Series A Preferred Stock will receive a payment equal to $0.001 per share of
Series A Preferred Stock before any proceeds are distributed to the holders of common stock. Shares of Series A Preferred Stock will generally have no
voting rights, except as required by law and except that the consent of holders of a majority of the then outstanding Series A Preferred Stock will be
required to amend the terms of the Series A Preferred Stock. As such, the Company has classified the Series A Preferred Stock within permanent equity in
its consolidated balance sheet.

Series B Convertible Preferred Shares

The Company has designated 1,000 of the 10,000,000 authorized shares of preferred stock as Series B Convertible Preferred Stock, or the Series

B Preferred Stock

Each share of Series B Preferred Stock is convertible into 1,000 shares of common stock at any time at the option of the holder, provided that the

holder will be prohibited from converting the Series B Preferred Stock into shares of common stock if, as a result of such conversion, the holder, together
with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to certain exceptions. In
the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Preferred Stock will receive a payment equal to $0.001 per share of
Series B Preferred Stock before any proceeds are distributed to the holders of common stock and equal to any distributions to the holders of Series A
Preferred Stock. Shares of Series B Preferred Stock will generally have no voting rights, except as required by law and except that the consent of holders of
a majority of the then outstanding Series B Preferred Stock will be required to amend the terms of the Series B Preferred Stock. As such, the Company has
classified the Series B Preferred Stock within permanent equity in its consolidated balance sheet.

Series C Convertible Preferred Shares

The Company has designated 3,333 of the 10,000,000 authorized shares of preferred stock as Series C Convertible Preferred Stock, or the Series

C Preferred Stock

Each share of Series C Preferred Stock is convertible into 1,000 shares of common stock at any time at the option of the holder, provided that the

holder will be prohibited from converting the Series C Preferred Stock into shares of common stock if, as a result of such conversion, the holder, together
with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to certain exceptions. In
the event of the Company’s liquidation, dissolution, or winding up, holders of Series C Preferred Stock will receive a payment equal to $0.001 per share of
Series C Preferred Stock before any proceeds are distributed to the holders of common stock and equal to any distributions to the holders of Series A
Preferred Stock and Series B Preferred Stock. Shares of Series C Preferred Stock will generally have no voting rights, except as required by law and except
that the consent of holders of a majority of the then outstanding Series C Preferred Stock will be required to amend the terms of the Series C Preferred
Stock. As such, the Company has classified the Series C Preferred Stock within permanent equity in its consolidated balance sheet.

Series D Convertible Preferred Shares

The Company has designated 3,215,000 of the 10,000,000 authorized shares of preferred stock as Series D Convertible Preferred Stock, or the

Series D Preferred Stock.

The shares of Series D Preferred Stock are convertible on a one-to-one basis into shares of common stock at any time at the option of the holder,
provided that the holder will be prohibited from converting the Series D Preferred Stock into shares of common stock if, as a result of such conversion, the
holder, together with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to
certain exceptions. In the event of the Company’s liquidation, dissolution, or winding up, holders of Series D Preferred Stock will receive a payment equal
to $0.001 per share of Series D Preferred Stock before any proceeds are distributed to the holders of common stock and equal to any distributions to the
holders of Series A Preferred Stock, Series B Preferred Stock and Series C Preferred Stock. Shares of Series D Preferred Stock will generally have no
voting rights, except as required by law and except that the consent of holders of a majority of the then outstanding Series D Preferred Stock will be
required to amend the terms of the Series D Preferred Stock. As such, the Company has classified the Series D Preferred Stock within permanent equity in
its consolidated balance sheet.

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SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Common Stock

On December 3, 2018, the Company filed a universal shelf registration statement on Form S-3 (Registration No. 333-228661) with the SEC, which

was declared effective on December 11, 2018, and pursuant to which the Company registered for sale up to $200.0 million of any combination of its
common stock, preferred stock, debt securities, warrants, rights and/or units from time to time and at prices and on terms that the Company may determine,
including up to $50.0 million of its common stock available for issuance pursuant to an “at-the-market” offering program sales agreement that it entered
into with Cantor Fitzgerald & Co. (“Cantor”) Under the sales agreement, Cantor may sell shares of the Company’s common stock by any method permitted
by law deemed to be an “at the market” offering as defined in Rule 415 of the Securities Act, subject to the terms of the sales agreement.

The prospectus underlying the “at-the-market” offering program was terminated on September 9, 2020 in connection with the Company’s
underwritten public offering that was completed in September 2020. At such time, the Company had raised approximately $15.4 million in sales of its
common stock under the “at-the-market” offering program, prior to deducting sales commissions, and had remaining available capacity of approximately
$34.6 million. On November 13, 2020, the Company reinstated the “at-the-market” offering program with a capacity of up to $34.0 million by filing an
updated prospectus.

Concurrently with the filing of this Annual Report on Form 10-K, the Company entered into a new sales agreement with Cantor and will be filing a
new universal shelf registration statement on Form S-3, including an “at-the-market” prospectus with the SEC, which is further described elsewhere in this
Annual Report on Form 10-K under “Item 9B. Other Events.”  The Company’s existing sales agreement with Cantor will terminate automatically at such
time as the SEC declares effective the Company’s new universal shelf registration statement on Form S-3.

On June 12, 2019, the Company entered into a securities purchase agreement with Novo Holdings A/S (“Novo”) to sell up to an aggregate of $10.0

million of its common stock, $0.001 par value per share, in two closings pursuant to the Company’s effective registration statement on Form S-3
(Registration No. 333-228661). The initial closing occurred on June 14, 2019 and consisted of 465,983 shares of common stock sold at a price of $10.73
per share for gross proceeds of $5.0 million prior to deducting offering expenses. The second closing of approximately $5.0 million occurred on October
18, 2019, pursuant to the terms of the securities purchase agreement. The number of shares sold in the second closing was determined by the volume
weighted average trading price (“VWAP”) of the Company’s common stock prior to the date of the second closing, and consisted of 465,116 shares of
common stock sold at a price of $10.75 per share for gross proceeds of approximately $5.0 million prior to deducting offering expenses.

In June 2019, a holder of the Company’s Series A Convertible Preferred stock elected to convert 500 shares into 500,000 shares of the Company’s

common stock, pursuant to such holder’s rights under the certificate of designation for such Series A Convertible Preferred Stock. In December 2020,
holders subsequently elected to convert the remaining 1,720 shares of Series A Preferred Stock into 1,720,000 shares of the Company’s common stock,
pursuant to such holder’s rights under the certificate of designation for such Series A Preferred Stock.

In March 2020, at the closing of the rights offering, a total of 1,046,249 shares of the Company’s common stock were issued with total gross

proceeds of $9.4 million. The cost of offering incurred was $0.4 million.

In September 2020, at the closing of the underwritten public offering, a total of 4,785,000 shares of common stock and 3,215,000 shares of Series D

Preferred Stock were issued with an aggregate public offering price of $80.0 million. Aggregate net proceeds from the offering were $74.7 million, after
deducting underwriting discounts and commissions and estimated offering expenses payable by the Company. On October 1, 2020, the Company issued an
additional 1,200,000 shares of its common stock pursuant to the underwriters’ exercise, in full, of their option to purchase additional shares of common
stock, resulting in additional net proceeds of approximately $11.2 million after deducting underwriting discounts and commissions.

During year ended December 31, 2020 the Company sold 993,870 shares of its common stock under the “at-the-market” offering sales agreement at

an average price of approximately $13.66 per share for aggregate gross proceeds of approximately $13.6 million prior to deducting sales commissions.

109

 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

9. Share-Based Compensation

2017 Stock Incentive Plan

On June 28, 2017, the Company’s stockholders approved the 2017 Stock Incentive Plan (the “2017 Plan”). The 2017 Plan provides for the grant of
incentive stock options, nonstatutory stock options, stock grants and stock-based awards. The 2017 Plan is administered by the board of directors, or at the
discretion of the board of directors, by a committee of the board. The exercise prices, vesting and other restrictions are determined at the discretion of the
board of directors, or their committee if so delegated, except that the exercise price per share of stock options may not be less than 100% of the fair market
value of the share of common stock on the date of grant and the term of stock option may not be greater than ten years. The number of shares initially
reserved for issuance under the 2017 Plan was 1,785,416 shares of common stock. The shares of common stock underlying any awards that are forfeited,
cancelled, repurchased or are otherwise terminated by the Company under the 2017 Plan will be added back to the shares of common stock available for
issuance under the 2017 Plan.

On October 18, 2017, the Company’s stockholders approved an amendment to the 2017 Plan, which became effective upon the completion of the

Company’s initial public offering, to increase the total number of shares reserved for issuance under the 2017 Plan from 1,785,416 to 2,696,401.
Additionally, the number of shares of common stock that may be issued under the 2017 Plan will automatically increase on each January 1, beginning with
the fiscal year ending December 31, 2019 and continuing for each fiscal year until, and including, the fiscal year ending December 31, 2027, equal to the
lowest of (i) 607,324 shares of common stock, (ii) 4% of the outstanding shares of common stock on such date and (iii) an amount determined by the
Company’s board of directors or compensation committee.

As of December 31, 2020, there were 288,432 shares remaining available to be issued under the 2017 Plan.

2019 Equity Incentive Plan

On March 11, 2019, the Company adopted the 2019 Inducement Equity Incentive Plan (the “2019 Inducement Plan”) to reserve 331,500 shares of
its common stock to be used exclusively for grants of awards to individuals that were not previously employees or directors of the Company as a material
inducement to such individuals’ entry into employment with Spero within the meaning of Rule 5635(c)(4) of the Nasdaq Listing Rules. The terms and
conditions of the 2019 Inducement Plan are substantially similar to those of the 2017 Plan.

In June 2020, the board of directors approved an increase of 700,000 shares of common stock for issuance under the 2019 Inducement Plan.

As of December 31, 2020, there were 481,500 shares remaining available to be issued under the 2019 Inducement Plan.

The following table summarizes stock option activity for all of our plans during 2020:

Outstanding as of December 31, 2019
Granted
Exercised
Forfeited or cancelled
Outstanding as of December 31, 2020

2017 Plan

2019 Inducement
Plan

Total Number of
Stock Options

2,798,128   
821,828   
(319,433)  
(163,290)  
3,137,233   

171,300   
392,700   
(5,000)  
(14,000)  
545,000   

2,969,428 
1,214,528 
(324,433)
(177,290)
3,682,233

As of December 31, 2020, a total of 4,942,549 shares have been authorized and reserved for issuance under all equity plans and 769,932 shares were

available for future issuance under such plans. 

110

 
 
 
      
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Performance-based awards

During 2019, the Company granted 100,000 options and 50,000 restricted stock units (“RSUs”) containing the same performance-based vesting
criteria. The 100,000 options are included in the table above but the 50,000 RSU’s are excluded from the table.  These options and RSUs (the “Performance
Awards”) are subject to performance-based vesting eligibility and a subsequent partial time-based vesting schedule. Specifically, the Performance Awards
are eligible for vesting based on the achievement of performance criteria, each representing a 25% vesting opportunity if achieved within a specified time
during the performance period (the “Performance Period”), and relating to (i) the release of tebipenem HBr top-line data; (ii) FDA acceptance of a
tebipenem HBr New Drug Application; (iii) non-dilutive financing; and (iv) equity financing. Following the Performance Period, Performance Awards
determined to be eligible for vesting as a result of achievement of the performance criteria will vest as follows: (a) 50% of the eligible award will vest
immediately, and (b) the remaining eligible award will vest (i) in the case of options, in equal monthly installments ending two years after the Performance
Period expiration, and (ii) in the case of RSUs, on such two year anniversary. During the year ended December 31, 2020, no compensation expense
associated with performance-based awards was recognized as the performance conditions were not probable of achievement.

The following table summarizes the activity of options and RSUs under the 2017 Plan containing performance-based vesting criteria during the year

ended December 31, 2020:

Outstanding as of December 31, 2019
Granted
Exercised
Forfeited or cancelled
Outstanding as of December 31, 2020

Number of
Performance Based
Option Shares

Number of
Performance Based
RSU Shares

84,146   
-   
-   
(21,039)  
63,107   

40,750 
- 
- 
(10,189)
30,561  

In January 2021, the Company cancelled the performance-based awards due to the non-achievement of the performance-based vesting criteria, and

the awards were added back to the shares of common stock available for issuance under the 2017 Plan. None of the outstanding options had vested as of
December 31, 2020.

Stock Option Valuation

The fair value of stock options is estimated using the Black-Scholes option-pricing model. The Company does not have sufficient company-specific

historical and implied volatility information and it therefore estimates its expected share volatility based on the historical volatility of a set of publicly
traded peer companies. The Company expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded
share price. The Company has estimated the expected term of the Company’s stock option awards utilizing the “simplified” method for awards that qualify
as “plain-vanilla.” The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time
periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company has never paid cash
dividends and does not expect to pay any cash dividends in the foreseeable future.

The assumptions that the Company used in the Black-Scholes option-pricing model to determine the fair value of stock option awards granted to

employees and directors were as follows, presented on a weighted average basis:

Risk-free interest rate
Expected term (in years)
Expected volatility
Expected dividend yield

111

Year Ended December 31,

2020

2019

1.1%  
6.2 
82.7%  
0.0%  

2.4%
6.3 
75.2%
0.0%

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following table summarizes details regarding stock options granted under our equity incentive plans for the year ended December 31, 2020:

Outstanding as of December 31, 2019
Granted
Exercised
Forfeited or cancelled
Outstanding as of December 31, 2020

Outstanding as of December 31, 2020 - vested and expected to vest

Exercisable at December 31, 2020

Number of
Shares

Weighted
Average

Exercise Price    

2,969,428    $
1,214,528   
(324,433)  
(177,290)  
3,682,233    $

3,682,233    $

1,771,383    $

8.13   
10.94   
6.80   
9.94   
9.10   

9.10   

7.94   

Weighted
Average
Contractual
Term
(in years)

Aggregate
Intrinsic Value  
(in thousands)  
6,689 
— 
— 
— 
37,881 
37,881 
20,286

7.94    $
—   
—   
—   
7.84    $
7.84    $
6.93    $

The weighted average grant-date fair value of stock options granted during the year ended December 31, 2020 was $7.79 per share. The weighted

average grant-date fair value of awards granted during the year ended December 31, 2019 was $5.62 per share. The aggregate intrinsic value of stock
options exercised during the years ended December 31, 2020 and 2019 was approximately $2.3 million and $0.4 million, respectively. The Company
satisfies stock option exercises with newly issued shares of its common stock.

As of December 31, 2020, total unrecognized compensation cost related to unvested stock option grants was approximately $11.5 million. This

amount is expected to be recognized over a weighted average period of approximately 2.7 years.

The Company recorded share-based compensation expense, for both incentive units and stock options in the following expense categories of its

consolidated statements of operations and comprehensive loss (in thousands):

Research and development expenses
General and administrative expenses
Total

10. Non-Controlling Interests

Spero Gyrase

Year Ended December 31,

2020

2019

  $

  $

2,229    $
2,659   
4,888    $

1,580 
2,196 
3,776

In March 2016, the Company entered into an agreement with Aviragen and its affiliates in order to acquire certain intellectual property and know-

how related to certain compounds. In connection with the transaction, the Company established Spero Gyrase, a Delaware corporation, and issued to
Aviragen 200 common shares of Spero Gyrase with a fair value of $1.1 million, which represented a 20% equity ownership interest in Spero Gyrase. In
addition, Spero Gyrase agreed to make future milestone and royalty payments in exchange for the intellectual property. The Company accounted for the
acquisition of technology as an asset acquisition because it did not meet the definition of a business. The Company recorded the acquired technology as
research and development expense in the consolidated statement of operations and comprehensive loss in the amount of $1.1 million, because the acquired
technology had not reached commercial feasibility and had no alternative future use, and recorded a non-controlling interest in Spero Gyrase in a
corresponding amount. In November 2019, the Company repurchased 100% of the minority investor’s outstanding shares in Spero Gyrase, Inc. at a price
per share of $0.001. As a result, as of December 31, 2020 and 2019, the Company no longer reports a non-controlling interest. Additionally, effective as of
January 1, 2020, the Company merged Spero Gyrase, Inc. with and into Spero, Therapeutics, Inc.

112

 
 
 
 
   
   
 
 
 
 
   
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

11. Income Taxes

Prior to the Reorganization (see Note 1), the Company’s former parent company, Spero Therapeutics, LLC, was treated as a partnership for federal

income tax purposes and, therefore, its owners, and not itself, were subject to U.S. federal or state income taxation on the income of Spero Therapeutics,
LLC. Prior to the Reorganization, all of Spero Therapeutics, LLC’s directly held subsidiaries (including Spero Therapeutics, Inc.) were treated as
corporations for U.S. federal income tax purposes and were subject to taxation in the United States or in other countries. Upon the Reorganization, Spero
Therapeutics, Inc. became the parent company for Spero Therapeutics, LLC’s former subsidiaries and these entities continue to be subject to taxation in the
United States or in other countries. In each reporting period, the Company’s tax provision includes the effects of consolidating the results of operations of
its subsidiaries.

During the years ended December 31, 2020 and 2019, the Company recorded no income tax benefits for the net operating losses incurred in each

year or interim period due to its uncertainty of realizing a benefit from those items.

The domestic and foreign components of loss before income taxes were as follows (in thousands):

Domestic
Foreign
Loss before income taxes

Year Ended December 31,

2020

2019

  $

  $

(77,671)   $
(609)  
(78,280)   $

(62,623)
1,698 
(60,925)

A reconciliation of the U.S. federal statutory income tax rate to the Company’s effective income tax rate is as follows:

Federal statutory income tax rate

Federal and state research and development tax credit
State taxes, net of federal benefit
Foreign rate differential
Nondeductible items
Increase in deferred tax asset valuation allowance

Effective income tax rate

Year Ended December 31,
2019

2020

(21.0)  
(3.2)  
(6.2)  
-   
0.9   
29.5   
—   

(21.0)
(3.0)
(6.7)
(0.8)
1.1 
30.4 
—

Net deferred tax assets as of December 31, 2020 and 2019 consisted of the following (in thousands):

Net operating loss carryforwards
Research and development tax credit carryforwards
Other

Total deferred tax assets

Valuation allowance

Net deferred tax assets

December 31,

2020

2019

63,612    $
8,024   
3,403   
75,039   
(75,039)  

—    $

44,239 
5,220 
2,521 
51,980 
(51,980)
—

  $

  $

As of December 31, 2020, the Company had U.S. federal and state net operating loss carryforwards of $228.1 million and $226.2 million,
respectively, which may be available to offset future income tax liabilities.  The federal NOLs of $73.0 million will expire at various dates from 2033 to
2037 and approximately $155.1 million can be carried forward indefinitely.  The state NOLs begin to expire in 2033 and will expire at various dates
through 2039. In addition, as of December 31, 2020, the Company had foreign net operating loss carryforwards of $10.7 million, which may be available to
offset future income tax liabilities and do not expire. As of December 31, 2020, the Company also had federal and state research and development tax
credit carryforwards of $6.7 million and $1.4 million, respectively, which may be available to offset future income tax liabilities and begin to expire in
2033 and 2028, respectively.

113

 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Utilization of the U.S. net operating loss carryforwards and research and development tax credit carryforwards may be subject to a substantial
annual limitation under Section 382 of the Internal Revenue Code of 1986, and corresponding provisions of state law, due to ownership changes that have
occurred previously or that could occur in the future. These ownership changes may limit the amount of carryforwards that can be utilized annually to
offset future taxable income. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain
stockholders or public groups in the stock of a corporation by more than 50% over a three-year period. The Company has not conducted a study to assess
whether a change of control has occurred or whether there have been multiple changes of control since inception due to the significant complexity and cost
associated with such a study. If the Company has experienced a change of control, as defined by Section 382, at any time since inception, utilization of the
net operating loss carryforwards or research and development tax credit carryforwards would be subject to an annual limitation under Section 382, which is
determined by first multiplying the value of the Company’s stock at the time of the ownership change by the applicable long-term tax-exempt rate, and then
could be subject to additional adjustments, as required. Any limitation may result in expiration of a portion of the net operating loss carryforwards or
research and development tax credit carryforwards before utilization. Further, until a study is completed by the Company and any limitation is known, no
amounts are being presented as an uncertain tax position.

The Company has evaluated the positive and negative evidence bearing upon its ability to realize the deferred tax assets. Management has
considered the Company’s history of cumulative net losses incurred since inception and its lack of commercialization of any products or generation of any
revenue from product sales since inception and has concluded that it is more likely than not that the Company will not realize the benefits of the deferred
tax assets. Accordingly, a full valuation allowance has been established against the deferred tax assets as of December 31, 2020 and 2019. Management
reevaluates the positive and negative evidence at each reporting period.

Changes in the valuation allowance for deferred tax assets during the years ended December 31, 2020 and 2019 related primarily to the increase in

net operating loss carryforwards and research and development tax credit carryforwards, and were as follows (in thousands):

Valuation allowance as of beginning of year

Decreases recorded as benefit to income tax provision
Increases recorded to income tax provision

Valuation allowance as of end of year

December 31,

2020

2019

(51,980)   $

—   
(23,059)  
(75,039)   $

(34,141)
— 
(17,839)
(51,980)

  $

  $

The Company has not recorded any amounts for unrecognized tax benefits as of December 31, 2020 or 2019. The Company’s policy is to record

interest and penalties related to income taxes as part of its income tax provision. As of December 31, 2020 or 2019, the Company had no accrued interest or
penalties related to uncertain tax positions and no amounts had been recognized in the Company’s statement of operations and comprehensive loss.

The Company has not, as yet, conducted a study of its research and development credit carryforwards. This study may result in an adjustment to the

Company’s research and development credit carryforwards; however, until a study is completed and any adjustment is known, no amounts are being
presented as an uncertain tax position. A full valuation allowance has been provided against the Company’s research and development credits and, if an
adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance.

Prior to the Reorganization, the Company filed separate U.S. income tax returns return for each of its subsidiaries. As a result of the Reorganization,

the Company will file U.S. income tax returns as a U.S. consolidated group. In Massachusetts, the Company files income tax returns as a combined group
except for its Massachusetts Securities Corporation subsidiary, which is a separate income tax filing. The statute of limitations for assessment by the
Internal Revenue Service and Massachusetts tax authorities remains open for all years since 2015. To the extent the Company has tax attribute
carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by the Internal Revenue Service or state
authorities to the extent utilized in a future period. No federal or state tax audits are currently in process.

114

 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

On December 22, 2017, former President Trump signed into law the Tax Cuts and Jobs Act (“TCJA”). The TCJA includes a number of changes to
existing tax law, including, among other things, a permanent reduction in the federal corporate income tax rate from a top marginal rate of 34% down to a
flat rate of 21%, effective as of January 1, 2018, as well as limitation of the deduction for net operating losses to 80% of annual taxable income and
elimination of net operating loss carrybacks, in each case, for losses arising in taxable years beginning after December 31, 2017 (though any such net
operating losses may be carried forward indefinitely). As a result of the TCJA, the Company was required to revalue deferred tax assets and liabilities
existing as of December 31, 2017 from the 34% federal rate in effect through the end of 2017, to the new 21%. This revaluation resulted in a reduction to
the Company’s deferred tax asset of $9.4 million. This amount was offset by a corresponding reduction in the valuation allowance. There was no impact to
the Company’s consolidated statements of operations and comprehensive loss as a result of the reduction in rates. The other provisions of the TCJA did not
have a material impact on the Company’s consolidated financial statements.

In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”), was signed into law in the United

States in March 2020. The CARES Act adjusted a number of provisions of the tax code, including the calculation and eligibility of certain deductions and
the treatment of net operating losses and tax credits. The enactment of the CARES Act did not result in any material adjustments to the Company’s income
tax provision for the year ended December 31, 2020, or to the Company’s net deferred tax assets as of December 31, 2020.  

12. Commitments and Contingencies

License Agreements

The Company has entered into license agreements with various parties under which it is obligated to make contingent and non-contingent payments

(see Note 14).

Operating Leases

The Company has entered into an operating lease agreement with U.S. REIF Central Plaza Massachusetts, LLC with respect to its corporate

headquarters located at 675 Massachusetts Avenue, Cambridge, Massachusetts (see Note 5).

Indemnification Agreements

In the ordinary course of business, the Company may provide indemnification of varying scope and terms to vendors, lessors, business partners and

other parties with respect to certain matters including, but not limited to, losses arising out of breach of such agreements or from intellectual property
infringement claims made by third parties. In addition, the Company has entered into indemnification agreements with members of its board of directors
that will require the Company, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as
directors or officers. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements
is, in many cases, unlimited. To date, the Company has not incurred any material costs as a result of such indemnifications. The Company is not aware of
any claims under indemnification arrangements that will have a material effect on its financial position, results of operations or cash flows, and it has not
accrued any liabilities related to such obligations in its consolidated financial statements as of December 31, 2020 or 2019.

Legal Proceedings

The Company is not currently party to any material legal proceedings. At each reporting date, the Company evaluates whether or not a potential loss

amount or a potential range of loss is probable and reasonably estimable under the provisions of the authoritative guidance that addresses accounting for
contingencies. The Company expenses as incurred the costs related to such legal proceedings.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

13. Government Contracts

BARDA

In July 2018, the Company was awarded a contract from Biomedical Advanced Research and Development Authority (“BARDA”) of up to $44.2
million to develop tebipenem HBr for the treatment of complicated urinary tract infections (“cUTI”) caused by antibiotic resistant Gram-negative bacteria
and for assessment against biodefense pathogens. The award committed initial funding of $15.7 million over a three-year base period from July 1, 2018 to
June 30, 2021 for cUTI development activities. In May 2019, the contract was modified to include additional funding of approximately $2.5 million for
development of tebipenem HBr, increasing the amount of the initial committed funding from $15.7 million to approximately $18.2 million and increasing
the overall potential award to $46.8 million. In January 2020, BARDA exercised its first contract option for additional committed funding of $15.9 million,
increasing the total committed funding to $34.1 million and extended the period of performance through November 1, 2021. The balance of the award is
subject to BARDA exercising a second option which would entail funding of $12.7 million and is exercisable by BARDA subject to, among other things,
satisfactory progress and results from the biodefense studies described below.

As part of an inter-agency collaboration between BARDA and the Defense Threat Reduction Agency (“DTRA”), a series of studies to assess the

efficacy of tebipenem HBr in the treatment of infections caused by biodefense threats such as anthrax, plague and melioidosis will be conducted under the
direction of Spero. The FDA requires data from a human pneumonic disease as supportive evidence of human efficacy when developing an antibiotic to
treat a pulmonary biothreat infection under 21 CFR 314.600, “The Animal Rule,” the scope of which the BARDA award includes the assessment of
tebipenem HBr levels in the lung of healthy volunteers as well as a proof of concept clinical trial in pneumonia patients. DTRA provides up to $10.0
million, in addition to the total potential award from BARDA, to cover the cost of the nonclinical biodefense aspects of the collaborative program for
tebipenem HBr. Together, BARDA and DTRA will provide up to $56.8 million in total funding for the clinical development and biodefense assessment of
tebipenem HBr, of which $12.7 million is subject to the exercise of options by BARDA and Spero’s achievement of specified milestones.

During the years ended December 31, 2020 and 2019, the Company recognized $7.9 million and $12.1 million of revenue under this agreement,

respectively.

U.S. Department of Defense

On July 1, 2019, the Company received a $5.9 million award from the DoD Congressionally Directed Medical Research Programs (“CDMRP”)

Joint Warfighter Medical Research Program. The funding will support the further clinical development of SPR206. The award commits non-dilutive
funding of $5.9 million over a four-year period to cover the costs of select Phase 1 pharmacology studies, a 28-day GLP non-human primate toxicology
study, and microbiological surveillance studies that would be required for a potential New Drug Application, or NDA, submission with the U.S. Food and
Drug Administration for SPR206. During the years ended December 31, 2020 and 2019, the Company recognized $0.4 million and less than $0.1 million in
revenue under this agreement, respectively.

In September 2016, the Company was awarded a cooperative agreement from the Peer Reviewed Medical Research Program with the DoD to

further develop anti-infective agents to combat Gram-negative bacteria. The agreement was initially structured as a single, two-year $1.5 million award
through September 2018. The performance period was extended through September 29, 2019. The Company was eligible for the full funding from the
DoD, as there were no options to be exercised at a later date. The DoD funding supported next-generation potentiator discovery and screening of SPR741
and SPR206. The Company and the DoD concluded the agreement at the end of the period of performance in September 2019. Company did not recognize
any revenue under this agreement during the year ended December 31, 2020 and recognized $0.2 million in revenue under this agreement, during the year
ended December 31, 2019.  

NIAID

In February 2017, the Company was awarded a grant from the U.S. National Institute of Allergy and Infectious Diseases, or NIAID, under its Small

Business Innovation Research program, over a two-year period from March 1, 2017 to February 28, 2019 to conduct additional preclinical studies of
SPR720, the Company’s novel oral bacterial gyrase inhibitor, for the treatment of non-tuberculous mycobacterial infections. The award was structured as a
12-month $0.6 million base period and a $0.4 million option period. Through December 31, 2017, only the base period funds were committed. In February
2018 NIAID exercised the $0.4 million 12-month option period. In January 2019, the period of performance for this award was extended for an additional
12-month period. During the years ended December 31, 2020 and 2019, the Company recognized less than $0.1 million and $0.1 million of revenue under
this agreement, respectively, before concluding the grant with NIAID.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

In June 2016, the Company entered into agreements with Pro Bono Bio PLC (“PBB”), a corporation organized under the laws of England, and

certain of its affiliates, including PBB Distributions Limited and Cantab Anti-Infectives Limited (“CAI”), in order to acquire certain intellectual property
and government funding arrangements relating to SPR206. Under these agreements, CAI agreed to submit a request to NIAID to novate the then CAI-held
NIAID contract to Spero, which was finalized in December 2017. The NIAID contract provides for development funding of up to $6.5 million over a base
period and three option periods. As of December 31, 2020, funding for the base period and the first two option periods totaling $5.9 million have been
committed. As part of the agreement, Spero was obligated to pay PBB a percentage of funds received from NIAID up to a maximum of $1.3 million, which
was fulfilled as of December 31, 2020. During the years ended December 31, 2020 and 2019, the Company recognized $0.7 million and $1.0 million in
revenue under this agreement, respectively.

14. License, Collaboration and Service Agreements

The Company has certain obligations under license agreements with third parties that include annual maintenance fees and payments that are
contingent upon achieving various development, regulatory and commercial milestones. Pursuant to these license agreements, the Company is required to
make milestone payments if certain development, regulatory and commercial milestones are achieved, and may have certain additional research funding
obligations. Also, pursuant to the terms of each of these license agreements, when and if commercial sales of a product commence, the Company will pay
royalties to its licensors on net sales of the respective products.

Vaxart (formerly Aviragen) License Agreement

Under the Company’s agreement with Vaxart for certain intellectual property and know-how relating to developing a gyrase inhibitor to develop

therapies for Gram-negative infections, the Company was obligated to make milestone payments upon the achievement of specified clinical, regulatory and
commercial milestones and to pay royalties of low single-digit percentages based on net sales of products the Company acquired under the agreement. In
November 2019, the Company and Vaxart entered into a stock repurchase agreement which terminated all of the Company’s obligations to Vaxart.

Cantab License Agreements

Under the Cantab Agreements, the Company is obligated to make milestone payments of up to $5.8 million upon the achievement of specified
clinical and regulatory milestones and a payment of £5.0 million ($6.8 million and $6.6 million as of December 31, 2020 and 2019, respectively) upon the
achievement of a specified commercial milestone. In addition, the Company has agreed to pay to PBB royalties, on a product-by-product and country-by-
country basis, of a low single-digit percentage based on net sales of products licensed under the agreement. During the year ended December 31, 2020, the
Company did not record any research and development expense related to the achievement of regulatory milestones for SPR206.

The Cantab Agreements continue indefinitely, with royalty payment obligations thereunder continuing on a product-by-product and country-by-

country basis until the later of ten years after the first commercial sale of such product in such country or the expiration in such country of the last to expire
valid claim of any of the applicable patents.

Vertex License Agreement

In May 2016, the Company entered into an agreement with Vertex Pharmaceuticals Incorporated (“Vertex”) whereby Vertex granted the Company

certain know-how and a sublicense to research, develop, manufacture and sell products for a proprietary compound, as well as a transfer of materials. In
exchange for the know-how, sublicense and materials, Spero paid Vertex an upfront, one-time, nonrefundable, non-creditable fee of $0.5 million, which
was recognized as research and development expense. As part of the agreement, the Company is obligated to make future milestone payments of up to
$80.2 million upon the achievement of specified clinical, regulatory and commercial milestones and to pay Vertex tiered royalties, on a product-by-product
and country-by-country basis, of a mid single-digit to low double-digit percentage based on net sales of products licensed under the agreement. During the
year ended December 31, 2020, the Company paid and recorded $0.9 million in research and development expense related to the achievement of regulatory
milestones for SPR720.

The agreement continues in effect until the expiration of all payment obligations thereunder, with royalty payment obligations continuing on a

product-by-product and country-by-country basis until the later of ten years after the first commercial sale of such product in such country or the date of
expiration in such country of the last to expire applicable patent. Further, Vertex has the right to terminate the agreement if provided with notification from
the Company of intent to cease all development or if no material development or commercialization efforts occur for one year.

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SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Meiji License Agreement

In June 2017, the Company entered into agreements with Meiji Seika Pharma Co. Ltd. (“Meiji”), a Japanese corporation, whereby Meiji granted to
the Company certain know-how and a license to research, develop, manufacture and sell products for a proprietary compound in the licensed territory. In
exchange for the know-how and license, the Company paid Meiji an upfront, one-time, nonrefundable, non-creditable fee of $0.6 million, which was
recognized as research and development expense. As part of the agreement, the Company is obligated to make future milestone payments of up to $2.0
million upon the achievement of specified clinical and regulatory milestones, to pay royalties, on a product-by-product and country-by-country basis, of a
low single-digit percentage based on net sales of products licensed under the agreement and to pay Meiji a low double-digit percentage of any sublicense
fees received by the Company up to $7.5 million. In October 2017, the Company paid a $1.0 million milestone payment to Meiji upon the enrollment of the
first patient in the Company’s Phase 1 clinical trial of tebipenem HBr. The payment was recorded as research and development expense in the statement of
operations and comprehensive loss for the year ended December 31, 2017. The Company paid Meiji approximately $1.6 million during the fourth quarter
of 2018 related to fixed assets which will be used in manufacturing related activities at Meiji. This equipment has been capitalized as property and
equipment in the consolidated balance sheet as of December 31, 2020.

The agreement continues in effect until the expiration of all payment obligations thereunder (including royalty payments and licensee revenue) on a

product-by-product and country-by-country basis, unless earlier terminated by the parties. Pursuant to the terms of the agreement, in addition to each
party’s right to terminate the agreement upon the other party’s material breach (if not cured within a specified period after receipt of notice) or insolvency,
the Company also has unilateral termination rights (i) in the event that the Company abandons the development and commercialization of tebipenem HBr
for efficacy, safety, legal or business factors, and (ii) under certain circumstances arising out of the head license with a global pharmaceutical company.

Northern License Agreement

In June 2017, in connection with the repurchase of all of the outstanding shares of Spero Potentiator, the Company amended its license agreement

with Northern such that the Company agreed to pay Northern up to $7.0 million upon the achievement of specified clinical, regulatory and other
milestones, including a total payment of $2.5 million upon the closing of an initial public offering. In addition, under an exchange agreement the Company
entered into with Northern, the Company is obligated to make a payment to Northern of $0.1 million upon the closing of an initial public offering. The
agreement had a perpetual term and no express termination rights. Upon the closing of the Company’s IPO in November 2017, the Company paid $2.6
million to Northern in connection with both the license and exchange agreements. This payment was recorded as research and development expense in the
Company’s statement of operations and comprehensive loss for the year ended December 31, 2017. The Company and Northern terminated the agreement
effective January 1, 2020.

Everest Medicines License Agreement

On January 4, 2019, the Company, through its wholly owned subsidiary New Pharma License Holdings Limited (“NPLH”), entered into a license
agreement (the “Original Everest License Agreement”), with Everest Medicines II Limited. Under the terms of the Original Everest License Agreement,
the Company granted Everest an exclusive license to develop, manufacture and commercialize SPR206 or products that contain SPR206 (the “Licensed
Products”), in Greater China (which includes Mainland China, Hong Kong and Macau), South Korea and certain Southeast Asian countries (the
“Territory”). The Company retained development, manufacturing and commercialization rights with respect to SPR206 and Licensed Products in the rest of
the world and also retained the right to develop or manufacture SPR206 and Licensed Products in the Territory for use outside the Territory. In addition to
the license grant with respect to SPR206, the Company, through its wholly owned subsidiary, Spero Potentiator, Inc., a Delaware corporation, granted
Everest a 12-month exclusive option to negotiate with it for an exclusive license to develop, manufacture and commercialize SPR741 in the Territory.

Under the terms of the Original Everest License Agreement and the Everest License Amendment, the Company received an upfront payment of
$3.0 million that was recognized in the first quarter of 2019, comprised of a $2.0 million payment to license SPR206 and $1.0 million for the exclusive
option to negotiate a license to develop SPR741. The Company also received a milestone payment of $2.0 million in the fourth quarter of 2020 upon
completion and delivery of the results of a clinical study. The Company will receive future milestones of up to $1.5 million if the Company chooses to
complete a future clinical study. On January 15, 2021, the Company entered into an amended and restated license agreement (“the Amended Everest
License Agreement”) with Everest and Potentiator, which amended and restated in its entirety the Original Everest License Agreement. The Amended
Everest License Agreement modifies the dates and values of certain milestone events related to development and commercialization of SPR206. Everest
will be now be making more significant investments in the development of SPR206 beyond what was contemplated at the

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

time of the Original Everest License Agreement. The Original Everest License Agreement provided that the Company could receive up to $59.5 million
upon achievement of certain milestones. The Amended Everest License Agreement provides that the Company may receive up to $38.0 million upon
achievement of certain milestones, of which $2.0 million has been received to date. In addition, under the Amended Everest License Agreement, the
Company assigned patents in the Territory to Everest, rather than licensing such patents to Everest, and the option related to SPR741 and the related
provisions have been removed. Under the terms of the Amended Everest License Agreement, the Company is also entitled to receive high single-digit to
low double-digit royalties on net sales, if any, of Licensed Products in the Territory following regulatory approval of SPR206. Everest has the right to
sublicense to affiliates and third parties in the Territory.

Everest is responsible for all costs related to developing, obtaining regulatory approval of and commercializing SPR206 and Licensed Products in
the Territory, and is obligated to use commercially reasonable efforts to develop, manufacture and commercialize Licensed Products, including to achieve
certain specified diligence milestones within agreed-upon periods. A joint development committee will be established between the Company and Everest to
coordinate and review the development, manufacturing and commercialization plans with respect to Licensed Products in the Territory.

Unless earlier terminated due to certain material breaches of the contract, or otherwise, the Amended Everest License Agreement will expire on

a jurisdiction-by-jurisdiction and Licensed Product-by-Licensed Product basis upon the latest to occur of expiration of the last valid claim under a licensed
patent in such jurisdiction, the expiration of regulatory exclusivity in such jurisdiction or ten years after the first commercial sale of such Licensed Product
in such jurisdiction. The Amended Everest License Agreement may be terminated in its entirety by Everest upon 90 or 180 days’ prior written notice,
depending on the stage of development of the initial Licensed Product.

Accounting Analysis and Revenue Recognition

The Company determined the Amended Everest License Agreement to be under the scope of ASC 606. Accordingly, in determining the appropriate

amount of revenue to be recognized, the Company performed the following steps: (i) identified the promised goods or services in the contract; (ii)
determined whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii)
measured the transaction price, including the constraint on variable consideration; (iv) allocated the transaction price to the identified performance
obligations in proportion to their SSP; and (v) recognized revenue when each performance obligation was deemed to be satisfied.  

Based on that evaluation, the Company identified three performance obligations, as presented below. The transaction price to be allocated to the
identified performance obligations was determined to be $5.0 million consisting of: (i) the license upfront fee of $2.0 million, (ii) the $1.0 million exclusive
option to negotiate a license to develop SPR741, and (iii) research and development services related to a milestone of $2.0 million for which the
achievement of the milestone was determined “most likely,” and that it was probable a significant reversal in the amount of cumulative revenue recognized
would not occur. This milestone was achieved as of December 31, 2020. The additional clinical study that is at the Company’s discretion to perform is
considered a marketing offering and therefore not included in the assessment at contract inception. The Company determined that the license was distinct
from the exclusive option for SPR741 and the research and development services. The following table shows the performance obligations, along with their
SSP and the transaction price allocated to those obligations (in thousands):

Performance Obligations

Standalone    

Transaction      

Selling
Price

Price
Allocated

Recognition Method

License and know-how transfer (1)

$

9,858 

$

3,553    Fully satisfied; recognized upon delivery of the license

Exclusive option on SPR741

Research and development services (2)

400 

3,614 

  $

Recognized in Q4 2019 upon the return of the IP rights to
Northern
Recognized over time as services are delivered through the
completion date, and fully recognized as of December 31,
2020.

144   

1,303   
5,000     

(1)

The standalone selling price for the license and know-how transfer was determined using the residual approach, corroborated by internal cost
estimates.

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SPERO THERAPEUTICS, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(2)

The standalone selling price for the research and development services was estimated using management’s best estimate of the cost of obtaining
these services at arm’s length from a third-party provider and using internal full time equivalent costs to support the development services.

During the year ended December 31, 2020, the Company recognized $0.3 million of revenue related to this agreement. As of December 31, 2020,

the aggregate amount of the transaction price was fully allocated to satisfied performance obligations, the Company had delivered the Clinical Study Report
covering the SAD/MAD Phase 1 Clinical Trial of SPR206 and pursuant to the Original Everest License Agreement, Everest paid the Company the $2.0
million milestone.

Gates MRI

In June 2019, the Company entered into a collaboration with Gates MRI to develop SPR720 for the treatment of lung infections caused by

Mycobacterium tuberculosis. In furtherance of the Gates MRI’s charitable purposes, the Company also granted to Gates MRI a no-cost, exclusive license to
develop, manufacture and commercialize SPR720 for the treatment of tuberculosis (“TB”) in low- and middle- income countries. The Gates MRI is
responsible for formulating and funding its own research plan for the development of SPR720 for TB. As such, Gates MRI will conduct and fund
preclinical and clinical studies for the development of SPR720 against TB. In addition, Gates MRI and the Company will jointly design and manage certain
collaborative research activities, which the Company will perform and which will be funded by the Gates MRI. Due to the cost-funded nature of the
payments and the Company’s assessment that it does not have a vendor/customer relationship with the Gates MRI, the Company will recognize the funding
received under the agreement as a reduction to the research and development expenses incurred, as the related expenses are incurred. During the years
ended December 31, 2020 and 2019, the Company recorded $2.1 million and $1.7 million, respectively, as a reduction to research and development
expense related to activities funded by Gates MRI.

Savior Service Agreement

In November 2018, the Company entered into a service agreement with Savior Lifetec Corporation (“Savior”) to perform technology transfer,
process development, analytical method development and testing and formulation development for tebipenem HBr. Per the terms of the agreement, the
Company paid Savior a non-refundable supervision fee of approximately $2.0 million to manage the buildout of a commercial manufacturing facility. The
supervision fee is classified as a prepaid asset on the Company’s balance sheet and is being amortized over a service period of approximately 34 months.
The Company has paid Savior an additional $5.1 million for facility build out costs, which is classified as a long-term asset on the Company’s balance
sheet as of December 31, 2020.

15. Australia Research and Development Tax Incentive

The Australian government has established a research and development tax incentive to encourage industry investment in research and development,

which is available to companies incorporated under Australian law that have core research and development activities. In September 2016, the Company
established Spero Potentiator Australia Pty Limited to carry out certain research and development activities. As this subsidiary meets the eligibility
requirements of the Australian tax law, it is eligible to receive a 43.5% tax incentive for qualified research and development activities. For the years ended
December 31, 2020 and 2019, $0.3 million and $0.4 million, respectively, was recorded as a reduction to research and development expenses in the
consolidated statements of operations and comprehensive loss associated with this tax incentive, representing 43.5% of the Company’s qualified research
and development spending in Australia. The refund is denominated in Australian dollars and, therefore, the receivable is re-measured to U.S. dollars as of
each reporting date. As of December 31, 2020 and 2019, the Company’s tax incentive receivables from the Australian government totaled $1.2 million and
$0.8 million, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

16. Net Loss per Share

Basic and diluted net loss per share attributable to common stockholders of Spero Therapeutics, Inc. was calculated as follows (in thousands, except

share and per share amounts):

Numerator:
Net loss
Deemed Dividend
Net loss attributable to common stockholders

Denominator:

Weighted average common shares outstanding,
   basic and diluted

Year Ended December 31,

2020

2019

  $

  $

(78,280)   $
(549)  
(78,829)   $

(60,925)
- 
(60,925)

22,386,122   

18,160,525 

Net loss per share, basic and diluted

  $

(3.52)   $

(3.35)

The net loss applicable to common stockholders for the year ended December 31, 2020 did not equal net loss due to the accretion of the beneficial
conversion feature of Series C Preferred Stock in the amount of $0.5 million. The beneficial conversion feature was initially recorded as a discount on the
Series C Preferred Stock with a corresponding amount recorded to Additional Paid-in Capital. The discount on the Series C Preferred Stock was then
immediately written off as a deemed dividend as the Series C Preferred Stock does not have a stated redemption date and is immediately convertible at the
option of the holder.

The Company excluded potentially dilutive securities from the computation of diluted net loss per share as the effect would be to reduce the net loss
per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to
common stockholders of Spero Therapeutics, Inc. is the same. The Company excluded the following potential common shares, presented based on amounts
outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because
including them would have had an anti-dilutive effect:

Options to purchase common stock
Unvested restricted stock units
Series A convertible preferred stock (as converted to common shares)
Series B convertible preferred stock (as converted to common shares)
Series C convertible preferred stock (as converted to common shares)
Series D convertible preferred stock (as converted to common shares)

Total

17. Retirement Plan

Year Ended December 31,

2020
3,682,233   
30,561   
—   
1,000,000   
2,287,000   
3,215,000   
10,214,794   

2019
2,969,428 
40,750 
1,720,000 
1,000,000 
— 
— 
5,730,178

The Company has a defined-contribution plan under Section 401(k) of the Internal Revenue Code (the “401(k) Plan”). The 401(k) Plan covers all
employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation on a pre-tax
basis. As currently established, the Company is not required to make any contributions to the 401(k) Plan. The Company made matching contributions to
the 401(k) Plan of $0.3 million and $0.2 million during the years ended December 31, 2020 and 2019, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

18. Subsequent Events

On January 15, 2021, the Company entered into an amended and restated license agreement, or the Amended Everest License Agreement, with

Everest and Potentiator, which amended and restated in its entirety the Original Everest License Agreement. The Amended Everest License Agreement
provides for Spero to assign country-specific patents (in the Everest territory) to Everest as opposed to licensing them, adjusts diligence milestone dates to
reflect updated clinical development plans and adjusts the value of potential development and sales milestones from $55.0 million to $34.5 million. Everest
will share all Everest-funded data with the Company for use in its future regulatory submissions.

On February 5, 2021, the Company announced that the FDA informed Spero that a clinical hold had been placed on its Phase 2a clinical trial of

SPR720, following the Company’s notification to the FDA of its decision to pause dosing in its ongoing Phase 2a clinical trial of SPR720 as a
precautionary measure related to events in its ongoing animal toxicology study of SPR720. The decision to implement the pause was made based on a
recommendation from the Company’s Safety Review Board, or SRB, following review of data from an ongoing toxicology study of SPR720 in adult non-
human primates in which mortalities with inconclusive causality to treatment were observed. The animal study is being conducted to assess the potential
toxicity of SPR720. A concurrent study of SPR720 in rats is proceeding uneventfully. These studies are meant to support longer-term treatment with
SPR720 beyond the 28 days currently supported by IND-enabling toxicology studies. No serious adverse events have been observed in any human study
participants.

Subsequent to receiving verbal notification from the FDA of the clinical hold, the Company received a formal clinical hold letter in which the FDA

has requested additional information from the non-human primate trial, including a study report. The Company has decided to discontinue the Phase 2a
clinical trial at this time to best facilitate future potential adjustments to the protocol based on FDA feedback and to avoid incurring costs associated with
the trial while on clinical hold. The Company is continuing to work with the FDA to evaluate the findings and determine the further development pathway
for the SPR720 clinical program.

With respect to its “at-the-market” program, on March 11, 2021, the Company entered into a new sales agreement with Cantor relating to sales, from
time to time, of the Company’s common stock up to an aggregate of $75.0 million. The Company will be filing a new universal shelf registration statement
on Form S-3, including an “at-the-market” prospectus with the SEC concurrently with the filing of this Annual Report on Form 10-K.

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer (our principal executive officer and principal

financial officer, respectively), evaluated the effectiveness of our disclosure controls and procedures as of December 31, 2020. The term “disclosure
controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act,
means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it
files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms.
Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a
company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its
principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any
controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management
necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure
controls and procedures as of December 31, 2020, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure
controls and procedures were effective at the reasonable assurance level.

Management’s Annual Report on Internal Controls Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) and

15d-15(f) under the Exchange Act. Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with general accepted accounting principles.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of
compliance with the policies or procedures may deteriorate.

Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we

conducted an evaluation of the effectiveness of our internal control over financial reporting based on the 2013 framework in Internal Control – Integrated
Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on our evaluation under that framework, our
management concluded that our internal control over financial reporting was effective as of December 31, 2020.

This Annual Report on Form 10-K does not include an attestation report of our independent registered public accounting firm due to a transition

period established by rules of the SEC for “emerging growth companies”.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the
three months ended December 31, 2020 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information.

With respect to our “at-the-market” program, on March 11, 2021, we entered into a new sales agreement with Cantor relating to sales, from time to

time, of the Company’s common stock up to an aggregate of $75.0 million. We will also file a new universal shelf registration statement on Form S-3,
including an “at the market” prospectus relating to the foregoing, with the SEC after the filing of this Annual Report on Form 10-K. Prior to the
effectiveness of our new universal shelf registration statement on Form S-3, we intend to file an Amendment to this Annual Report on Form 10-K to
present the information required by Part III of Form 10-K.  Our existing sales agreement with Cantor, dated December 3, 2018, will terminate automatically
at such time as the SEC declares effective our new universal shelf registration statement on Form S-3.

123

 
Item 10. Directors, Executive Officers and Corporate Governance.

PART III

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Management and Corporate

Governance Matters,” “Section 16(a) Beneficial Ownership Reporting Compliance,” and “Code of Conduct and Ethics” in the Company’s proxy statement
for the 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year covered by this Annual Report on
Form 10-K.

Item 11. Executive Compensation.

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Executive Officer and Director

Compensation” and “Management and Corporate Governance Matters -- Compensation Committee Interlocks and Insider Participation” in our proxy
statement for the 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year covered by this Annual
Report on Form 10-K.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Security Ownership of Certain

Beneficial Owners and Management” and “Equity Compensation Plans and Other Benefits Plans” in our proxy statement for the 2021 Annual Meeting of
Stockholders to be filed with the SEC within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The response to this item is incorporated by reference from the discussion responsive thereto under the captions “Certain Relationships and Related
Transactions” and “Management and Corporate Governance Matters” in our proxy statement for the 2021 Annual Meeting of Stockholders to be filed with
the SEC within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 14. Principal Accounting Fees and Services.

The response to this item is incorporated by reference from the discussion responsive thereto under the caption “Independent Public Accountants”

in our proxy statement for the 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year covered by
this Annual Report on Form 10-K.

124

 
PART IV

Item 15. Exhibits, Financial Statement Schedules.

(1)

Consolidated Financial Statements

See Index to Consolidated Financial Statements at Item 8 herein.

(2)

Financial Statement Schedules

All schedules are omitted because they are not applicable or the required information is shown in the consolidated financial statements or notes

thereto.

(3)

Exhibits

The following is a list of exhibits filed as part of this Annual Report on Form 10-K.

Exhibit
Number

Exhibit Description

  Filed
with
this
Report

Incorporated by
Reference herein
from Form or
Schedule

  3.1

  Amended and Restated Certificate of Incorporation of the Registrant  

  3.2

  Amended and Restated Bylaws of the Registrant

  3.3

  Certificate of Designation of Preferences, Rights and Limitations of

Series A Convertible Preferred Stock

  3.4

  Certificate of Designation of Preferences, Rights and Limitations of

Series B Convertible Preferred Stock

  3.5

  Certificate of Designation of Preferences, Rights and Limitations of

Series C Convertible Preferred Stock

  3.6

  Certificate of Designation of Preferences, Rights and Limitations of

Series D Convertible Preferred Stock

  4.1

  Form of Common Stock Certificate

  4.2

  Investors’ Rights Agreement, dated as of June 30, 2017, by and

between the Registrant and the other parties thereto

  4.3

  Description of Registrant’s Securities

  10.1#

  2017 Stock Incentive Plan, as amended

  10.2#

  Form of Stock Option Agreement under the 2017 Stock Incentive

Plan, as amended

  10.3#

  2019 Inducement Equity Incentive Plan, as amended

  10.4#

  Form of Stock Option Agreement under the 2019 Inducement Equity

Incentive Plan, as amended

  10.5#

  Form of Director and Officer Indemnification Agreement

  10.6#

  Non-Employee Director Compensation Policy, as amended

125

Form 8-K
(Exhibit 3.1)

Form 8-K
(Exhibit 3.2)

Form 8-K
(Exhibit 3.1)

Form 8-K
(Exhibit 3.1)

Form 8-K
(Exhibit 3.1)

Form 8-K
(Exhibit 3.1)

Form S-1
(Exhibit 4.1)

Form S-1
(Exhibit 4.2)

Form 10-K
(Exhibit 4.3)

Form 10-Q
(Exhibit 10.1)

Form 10-Q
(Exhibit 10.2)

Form 10-Q
(Exhibit 10.1)

Form 10-Q
(Exhibit 10.2)

Form S-1
(Exhibit 10.4)

Form 10-K
(Exhibit 10.6)

SEC File /
Registration
Number

Filing Date

11/6/2017

001-38266

11/6/2017

001-38266

7/17/2018

001-38266

11/16/2018

001-38266

2/28/2020

001-38266

9/14/2020

001-38266

10/6/2017

333-220858

10/6/2017

333-220858

3/16/2020

001-38266

12/14/2017

001-38266

12/14/2017

001-38266

8/6/2020

001-38266

8/6/2020

001-38266

10/6/2017

333-220858

3/16/2020

001-38266

 
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  10.7#

  Employment Agreement, dated October 20, 2017, by and

between the Registrant and Ankit Mahadevia, M.D.

Form S-1/A
(Exhibit 10.5)

10/23/2017

333-220858

  10.8#

  Employment Agreement, dated December 9, 2020, by and

X

between the Registrant and Satyavrat Shukla

  10.9#

  Amended and Restated Employment Agreement, dated April 22,
2020, by and between the Registrant and Thomas Parr Jr., Ph.D.

    10.10#   Employment Agreement, dated October 20, 2017, by and
between the Registrant and Cristina Larkin

    10.11#   Employment Agreement, dated December 13, 2017, by and
between the Registrant and David Melnick, M.D.

    10.12#   Employment Agreement, dated January 1, 2020, by and between

the Registrant and Timothy Keutzer

  10.13#   Employment Agreement, dated November 6, 2020, by and

X

between the Registrant and Tamara Joseph

    10.14#   Consulting Agreement, dated April 18, 2019, by and between the

Registrant and David P. Southwell

    10.15#   Consulting Agreement, dated November 4, 2019, by and

between the Registrant and Danforth Advisors, LLC

    10.16#   Lease Agreement, dated August 24, 2015, by and between the

Registrant and U.S. REIF Central Plaza Massachusetts, LLC

  10.17

  10.18

  First Amendment to Lease Agreement, dated January 17, 2018,
by and between the Registrant and U.S. REIF Central Plaza
Massachusetts, LLC

  Second Amendment to Lease Agreement, dated December 16,
2019, by and between the Registrant and U.S. REIF Central
Plaza Massachusetts, LLC

  10.19

  Third Amendment to Lease Agreement, dated May 4, 2020, by

and between the Registrant and U.S. REIF Central Plaza
Massachusetts, LLC

  10.20

  Sublease, dated July 6, 2016, by and between the Registrant and

Tetraphase Pharmaceuticals, Inc.

    10.21†   Stock Purchase Agreement, dated June 6, 2016, by and among
Spero Cantab, Inc., the Registrant, Spero Cantab UK Limited,
PBB Distributions Limited, New Pharma License Holdings
Limited, Cantab Anti-Infectives Ltd and Pro Bono Bio PLC, as
amended by Amendment to Stock Purchase Agreement, dated
July 18, 2017

    10.22†   Assignment and License Agreement, dated May 9, 2016, by and
among Spero Trinem, Inc., the Registrant and Vertex
Pharmaceuticals Incorporated

    10.23†   License Agreement, dated June 14, 2017, by and between the
Registrant and Meiji Seika Pharma Co., Ltd., as supplemented
by Addendum to License Agreement, dated June 14, 2017

126

Form 10-Q
(Exhibit 10.3)

Form S-1/A
(Exhibit 10.8)

Form 10-K
(Exhibit 10.9)

Form 10-K
(Exhibit 10.12)

Form 10-K
(Exhibit 10.13)

Form 10-Q
(Exhibit 10.1)

Form S-1
(Exhibit 10.11)

Form 8-K
(Exhibit 99.1)

Form 8-K
(Exhibit 99.1)

Form 10-Q
(Exhibit 10.4)

Form S-1
(Exhibit 10.12)

Form S-1
(Exhibit 10.13)

Form S-1/A
(Exhibit 10.14)

Form S-1
(Exhibit 10.15)

8/6/2020

001-38266

10/23/2017

333-220858

4/2/2018

001-38266

3/16/2020

001-38266

3/16/2020

001-38266

5/8/2020

001-38266

10/6/2017

333-220858

1/23/2018

001-38266

12/19/2019

001-38266

8/6/2020

001-38266

10/6/2017

333-220858

10/6/2017

333-220858

10/23/2017

333-220858

10/6/2017

333-220858

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Form 10-Q
(Exhibit 10.1)

11/8/2018

001-38266

Form 8-K
(Exhibit 10.1)

Form S-3
(Exhibit 1.2)

Form 10-Q
(Exhibit 10.1)

Form S-1/A
(Exhibit 10.17)

Form S-1
(Exhibit 16.1)

Form 10-K
(Exhibit 21.1)

11/16/2018  

001-38266

12/3/2018

333-228661

8/8/2019

001-38266

10/23/2017

333-220858

10/6/2017

333-220858

3/16/2020

001-38266

    10.24†   Contract Award, dated July 12, 2018, issued by the Biomedical

Advanced Research and Development Authority of the United States
Department of Health and Human Services

    10.25††   Amended and Restated License Agreement, dated January 15, 2021,

X

by and between the Registrant and Everest Medicines II Limited

  10.26

  10.27

  10.28

  10.29

  Exchange Agreement, dated November 15, 2018, by and among
Spero Therapeutics, Inc. and Biotechnology Value Fund, L.P.,
Biotechnology Value Fund II, L.P., Biotechnology Value Trading
Fund OS, L.P. and MSI BVF SPV LLC

  Controlled Equity Offering Sales Agreement, dated December 3,
2018, by and between the Registrant and Cantor Fitzgerald & Co.

  Controlled Equity Offering Sales Agreement, dated March 11, 2021,
by and between the Registrant and Cantor Fitzgerald & Co.

X

  Securities Purchase Agreement, dated June 12, 2019, by and between
the Registrant and Novo Holdings A/S

  10.30

  Form of Proprietary Information and Inventions Assignment

Agreement

16.1

  Letter of KPMG LLP, dated August 25, 2017, regarding changes in

the Registrant's certifying accountants

21.1

  List of Subsidiaries of the Registrant

23.1

  Consent of PricewaterhouseCoopers LLP, independent registered

public accounting firm

31.1

  Certification of Principal Executive Officer pursuant to Section 302

of the Sarbanes-Oxley Act of 2002

31.2

  Certification of Principal Financial Officer pursuant to Section 302 of

the Sarbanes-Oxley Act of 2002

32*

  Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant
to Section 906 of the Sarbanes-Oxley Act of 2002, by Principal
Executive Officer and Principal Financial Officer

X

X

X

X

127

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
101.INS

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101.CAL   Inline XBRL Taxonomy Extension Calculation Linkbase Document

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document)

X

X

X

X

X

X

X

†
††

#
*

Confidential treatment received as to portions of the exhibit. Confidential materials omitted and filed separately with the SEC.
Certain confidential portions of this Exhibit were omitted by means of marking such portions with brackets (“[***]”) because the identified
confidential portions (i) are not material and (ii) would be competitively harmful if publicly disclosed.
Management contract or compensatory plan.
The certification attached as Exhibit 32 that accompanies this Annual Report on Form 10-K is not deemed filed with the Securities and Exchange
Commission and is not to be incorporated by reference into any filing of Spero Therapeutics, Inc. under the Securities Act of 1933, as amended, or
the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Form 10-K, irrespective of any general incorporation
language contained in such filing.

Item 16. Form 10-K Summary.

None.

128

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on

its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 11, 2021

  SPERO THERAPEUTICS, INC.

  By:

/s/ Ankit Mahadevia, M.D.
Ankit Mahadevia, M.D.
President and Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints each of Ankit
Mahadevia, M.D. and Sath Shukla his true and lawful attorney-in-fact and agent, with full power of substitution, for him and in his name, place and stead,
in any and all capacities, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent, full power and authority
to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he might
or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or his substitutes or substitute, may lawfully do or cause to
be done by virtue hereof.

IN WITNESS WHEREOF, each of the undersigned has executed this Power of Attorney as of the date indicated opposite his name.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the

registrant in the capacities and on the dates indicated.

Name

/s/ Ankit Mahadevia, M.D.
Ankit Mahadevia, M.D.

/s/ Sath Shukla
Sath Shukla

/s/ Milind Deshpande, Ph.D.
Milind Deshpande, Ph.D.

/s/ Jean-François Formela, M.D.
Jean-François Formela, M.D.

/s/ Scott Jackson
Scott Jackson

/s/ John C. Pottage, M.D.
John C. Pottage, M.D.

/s/ Cynthia Smith
Cynthia Smith

/s/ Frank E. Thomas
Frank E. Thomas

/s/ Patrick Vink, M.D.
Patrick Vink, M.D.

Title

President, Chief Executive Officer and Director
(Principal Executive Officer)

Date

  March 11, 2021

Chief Financial Officer and Treasurer
(Principal Financial Officer and Principal Accounting Officer)

  March 11, 2021

Director

Director

Director

Director

Director

Director

Director

129

  March 11, 2021

  March 11, 2021

  March 11, 2021

  March 11, 2021

  March 11, 2021

  March 11, 2021

  March 11, 2021

 
 
 
 
   
 
 
   
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
Exhibit 10.8

EXECUTIVE EMPLOYMENT AGREEMENT

This Executive Employment Agreement (this “Agreement”) is made and entered into this 9th day of December, 2020
(the  “Effective  Date”)  by  and  between  Spero  Therapeutics,  Inc.,  a  Delaware  corporation  (“Company”),  and  Satyavrat  Shukla
(“Executive”).

WHEREAS, Executive and Company desire to set forth the terms and conditions for the employment of the Executive
by  the  Company  to  assure  the  harmonious  performance  of  the  affairs  of  Company  as  well  as  to  enter  into  a  Proprietary
Information and Inventions Assignment Agreement (the “Restrictive Covenant Agreement”).

NOW, THEREFORE,  in  consideration  of  the  mutual  promises,  terms,  provisions,  and  conditions  contained  herein,

Company and Executive hereby agree as follows:  

1.

Roles and Duties.  Subject to the terms and conditions of this Agreement, Company shall employ Executive
as its Chief Financial Officer (“CFO”) reporting to Company’s Chief Executive Officer (“CEO”).  The Executive shall have such
duties and responsibilities as are reasonably determined by the Board of Directors (“Board”) and are consistent with the duties
customarily performed by a CFO of a similarly situated company in the United States.  Executive accepts such employment upon
the  terms  and  conditions  set  forth  herein,  and  agrees  to  perform  such  duties  and  discharge  such  responsibilities  to  the  best  of
Executive’s ability. During Executive’s employment, Executive shall devote all of Executive’s business time and energies to the
business  and  affairs  of  Company.  Notwithstanding  the  foregoing,  nothing  herein  shall  preclude  Executive  from  (i)  performing
services for such other companies as Company may designate or permit; (ii) serving, with the prior written consent of the Board,
which consent shall not be unreasonably withheld, as a member of the boards of directors or advisory boards (or their equivalents
in the case of a non-corporate entity) of non-competing businesses or charitable, educational or civic organizations; (iii) engaging
in  charitable  activities  and  community  affairs;  and  (iv)  managing  Executive's  personal  investments  and  affairs;  provided,
however, that the activities set out in clauses (i), (ii), (iii) and (iv) shall be limited by Executive so as not to materially interfere,
individually or in the aggregate, with the performance of Executive's duties and responsibilities hereunder.

2.

Term of Employment.

Term.  Subject to the terms hereof, Executive’s employment hereunder shall commence on January
4, 2021 (the “Start Date”) and continue until terminated hereunder by either party (such term of employment referred to herein as
the “Term”).

(a)

hereunder shall terminate upon the earliest to occur of the following:

(b)

Termination.  Notwithstanding anything else contained in this Agreement, Executive’s employment

(i)

(ii)

Death.  Immediately upon Executive’s death;

Termination by Company.

(A)

If because of Executive’s Disability (as defined below in Section 2(c)), written

notice by Company to Executive that Executive’s

 
 
 
employment  is  being  terminated  as  a  result  of  Executive’s  Disability,  which  termination  shall  be
effective on the date of such notice or such later date as specified in writing by Company;

(B)

If  for  Cause  (as  defined  below  in  Section  2(d)),  written  notice  by  Company  to
Executive that Executive’s employment is being terminated for Cause, which termination shall be
effective on the date of such notice or such later date as specified in writing by Company, provided
that if prior to the effective date of such termination Executive has cured the circumstances giving
rise to the Cause (if capable of being cured as provided in Section 2(d)), then such termination shall
not be effective; or

(C)

If by Company for reasons other than under Sections 2(b)(ii)(A) or (B), written
notice  by  Company  to  Executive  that  Executive’s  employment  is  being  terminated,  which
termination shall be effective thirty (30) days after the date of such notice.

(iii)

Termination by Executive.  

(A)

If  for  Good  Reason  (as  defined  below  in  Section  2(e)),  written  notice  by
Executive to Company that Executive is terminating Executive’s employment for Good Reason and
that  sets  forth  the  factual  basis  supporting  the  alleged  Good  Reason,  which  termination  shall  be
effective thirty (30) days after the date of such notice; provided that if prior to the effective date of
such termination Company has cured the circumstances giving rise to the Good Reason if capable
of being cured as provided in Section 2(e), then such termination shall not be effective; or

(B)

If without Good Reason, written notice by Executive to Company that Executive
is  terminating  Executive’s  employment,  which  termination  shall  be  effective  no  fewer  than  sixty
(60) days after the date of such notice unless waived, in whole or in part, by Company.

Notwithstanding  anything  in  this  Section  2(b),  Company  may  at  any  point,  under  the  conditions  set  forth  in  Section
2(b)(ii)(B),  terminate  Executive’s  employment  for  Cause  prior  to  the  effective  date  of  any  other  termination  contemplated
hereunder; provided that if prior to the effective date of such for-Cause termination Executive has cured the circumstances giving
rise to the Cause (if capable of being cured as provided in Section 2(d)), then such termination shall not be effective.  

(c)

Definition of “Disability”.    For  purposes  of  this  Agreement,  “Disability”  shall  mean  Executive’s
incapacity  or  inability  to  perform  Executive’s  duties  and  responsibilities  as  contemplated  herein  by  reason  of  a  medically
determinable  mental  or  physical  impairment  for  one  hundred  twenty  (120)  days  or  more  within  any  one  (1)  year  period
(cumulative  or  consecutive),  which  impairment  can  reasonably  be  expected  to  result  in  death  or  can  be  expected  to  last  for  a
continuous  period  of  not  less  than  six  (6)  months.   The  determination  that  Executive  is  disabled  hereunder,  if  disputed  by  the
parties, shall be resolved by a physician reasonably satisfactory to

2

 
 
 
Executive and Company, at Company’s expense, and the determination of such physician shall be final and binding upon both
Executive and Company.  Executive hereby consents to such examination and consultation by a physician.  Company shall keep
all information it receives as a result of such inquiry and determination confidential and shall not use it for any purpose other than
in connection with exercising its rights under this Agreement.

(d)

Definition of “Cause”.   As  used  herein,  “Cause”  shall  mean:  (i)  Executive’s  conviction  of  (A)  a
felony or (B) any misdemeanor involving moral turpitude, deceit, dishonesty or fraud; (ii) Executive’s willful failure or refusal to
comply with lawful directions of the CEO, which failure or refusal continues for more than thirty (30) days after written notice is
given to Executive by the CEO, which notice sets forth in reasonable detail the nature of such failure or refusal; (iii) willful and
material breach by Executive of a written Company policy applicable to Executive or Executive’s covenants and/or obligations
under  this  Agreement  or  the  material  breach  of  the  Restrictive  Covenant  Agreement;  and/or  (iv)  material  misconduct  by
Executive  that  seriously  discredits  or  damages  Company  or  any  of  its  affiliates.    Except  in  the  case  of  (ii)  above,  it  is  not
necessary  that  the  Company’s  finding  of  Cause  occur  prior  to  Executive’s  termination  of  service.    If  Company  determines,
subsequent  to  Executive’s  termination  of  service,  that  prior  to  Executive’s  termination  Executive  engaged  in  conduct  which
would constitute “Cause,” (other than pursuant to (ii) above) then Executive shall have no right to any benefit or compensation
under this Agreement.

(e)

Definition  of  “Good  Reason”.  As  used  herein,  “Good  Reason”  shall  mean:  (i)  relocation  of
Executive’s principal business location to a location more than thirty (30) miles from Executive’s then-current business location;
(ii) a material diminution in Executive’s duties, authority or responsibilities; (iii) a material reduction in Executive’s Base Salary;
or (iv) willful and material breach by Company of its covenants and/or obligations under this Agreement; provided that, in each
of the foregoing clauses (i) through (iv) (A) Executive provides Company with written notice that Executive intends to terminate
Executive’s employment hereunder for one of the grounds set forth in this Section 2(e) within thirty (30) days of such ground
occurring, (B) if such ground is capable of being cured, Company has failed to cure such ground within a period of thirty (30)
days from the date of such written notice, and (C) Executive terminates by written notice Executive’s employment within sixty-
five (65) days from the date that Executive provides the notice contemplated by clause (A) of this Section 2(e).  For purposes of
clarification, the above-listed conditions shall apply separately to each occurrence of Good Reason, and failure to adhere to such
conditions  in  the  event  of  Good  Reason  shall  not  disqualify  Executive  from  asserting  Good  Reason  for  any  subsequent
occurrence of Good Reason. In addition, Executive may terminate Executive’s employment for Good Reason within one (1) year
following  a  Change  of  Control  (as  defined  below)  if,  after  the  Change  of  Control,  Executive  is  not  an  executive  of  the  parent
company,  provided  that  Executive’s  roles,  responsibilities  and  scope  of  authority  within  the  subsidiary  are  not  comparable  to
Executive’s  roles,  responsibilities  and  scope  of  authority  with  Company  prior  to  the  Change  of  Control.  For  purposes  of  this
Agreement, “Good Reason” shall be interpreted in a manner, and limited to the extent necessary, so that it shall not cause adverse
tax  consequences  for  either  party  with  respect  to  Section  409A  (“Section  409A”)  of  the  Internal  Revenue  Code  of  1986,  as
amended (the “Code”) and any successor statute, regulation and guidance thereto.

3

 
 
 
 
3.

Compensation.

(a)

Base  Salary.    Commencing  on  the  Start  Date,  Company  shall  pay  Executive  a  base  salary  (the
“Base  Salary”)  at  the  annual  rate  of  Four  Hundred  Twenty  Five  Thousand  Dollars  ($425,000.00).  The  Base  Salary  shall  be
payable  in  substantially  equal  periodic  installments  in  accordance  with  Company’s  payroll  practices  as  in  effect  from  time  to
time.  Company shall deduct from each such installment all amounts required to be deducted or withheld under applicable law or
under  any  employee  benefit  plan  in  which  Executive  participates.  The  Board  or  an  appropriate  committee  thereof  shall,  on  an
annual basis, review the Base Salary, which may be adjusted upward (but not downward) at Company’s discretion.

(b)

Annual  Performance  Bonus.    Commencing  with  fiscal  year  2021,  Executive  shall  be  eligible  to
receive  an  annual  cash  bonus  (the  “Annual Performance Bonus”),  with  the  target  amount  of  such  Annual  Performance  Bonus
equal to forty percent (40%) of Executive’s Base Salary in the year to which the Annual Performance Bonus relates; provided
that  the  actual  amount  of  the  Annual  Performance  Bonus  may  be  greater  or  less  than  such  target  amount.   The  amount  of  the
Annual Performance Bonus shall be determined by the Board or an appropriate committee thereof in its sole discretion, and shall
be  paid  to  Executive  no  later  than  March  15th  of  the  calendar  year  immediately  following  the  calendar  year  in  which  it  was
earned.  Except as provided in Section 4, Executive must be employed by Company on the last day of the applicable fiscal year to
which  the  Annual  Performance  Bonus  relates  in  order  to  be  eligible  for,  and  to  be  deemed  as  having  earned,  such  Annual
Performance Bonus. Company shall deduct from the Annual Performance Bonus all amounts required to be deducted or withheld
under applicable law or under any employee benefit plan in which Executive participates.

(c)

Equity.  As  a  material  inducement  to  the  Executive  joining  the  Company,  on  the  Start  Date,  the
Company shall award Executive an inducement stock option to purchase 75,000 shares of the Company’s common stock, subject
to approval by the Board or an authorized delegate thereof (the “Inducement Option Grant”). The Inducement Option Grant shall
be subject to the terms and conditions of the Company’s 2019 Inducement Equity Incentive Plan, as amended, and the applicable
option  agreement  between  the  Executive  and  the  Company  entered  into  pursuant  thereto.    The  Inducement  Option  Grant  is
intended as an inducement grant under Nasdaq Rule 5635(c)(4) and shall not qualify as an incentive stock option.  The exercise
price of the stock options subject to the Inducement Option Grant shall be the closing price of the Company’s common stock on
the Nasdaq Stock Market on the Start Date.  The Inducement Option Grant shall be evidenced in writing by, and subject to the
terms of, a Company stock option agreement which shall specify vesting over four (4) years, 25% on the first anniversary of the
Start Date with the balance to vest in equal monthly installments over the following 36 months, and exercise of vested options for
up to ten (10) years except as otherwise provided in the stock option agreement. Commencing in fiscal year 2022, Executive shall
be  eligible  to  be  considered  for  the  grant  of  stock  options  and/or  other  equity-based  awards  commensurate  with  Executive’s
position  and  responsibilities.  The  amount,  terms  and  conditions  of  any  stock  option  or  other  equity-based  award  shall  be
determined by the Board or an appropriate committee thereof in its discretion and set forth in the applicable equity plan and other
documents governing the award.

paid time off (“PTO”) per year, to be scheduled so as not to materially

(d)

Paid Time Off.  In addition to standard paid holidays, Executive may take up to twenty (20) days of

4

 
 
 
disrupt  Company’s  operations,  pursuant  to  the  terms  and  conditions  of  Company  policy  and  practices  as  applied  to  Company
senior executives.  

(e)

Fringe  Benefits.  Executive  shall  be  entitled  to  participate  in  all  benefit/welfare  plans  and  fringe
benefits  provided  to  Company  senior  executives.    Executive  understands  that,  except  when  prohibited  by  applicable  law,
Company’s benefit plans and fringe benefits may be amended by Company from time to time in its sole discretion.  The terms of
any such benefits shall be governed by the applicable plan documents and Company policies in effect from time to time.

(f)

Reimbursement of Expenses.  Company shall reimburse Executive for all ordinary and reasonable
out-of-pocket  business  expenses  incurred  by  Executive  in  furtherance  of  Company’s  business  in  accordance  with  Company’s
policies with respect thereto as in effect from time to time.  Executive must submit any request for reimbursement no later than
ninety (90) days following the date that such business expense is incurred. All reimbursements provided under this Agreement
shall be made or provided in accordance with the requirements of Section 409A including, where applicable, the requirement that
(i) any reimbursement is for expenses incurred during Executive’s lifetime (or during a shorter period of time specified in this
Agreement); (ii) the amount of expenses eligible for reimbursement during a calendar year may not affect the expenses eligible
for reimbursement in any other calendar year; (iii) the reimbursement of an eligible expense shall be made no later than the last
day  of  the  calendar  year  following  the  year  in  which  the  expense  is  incurred;  and  (iv)  the  right  to  reimbursement  or  in-kind
benefits is not subject to liquidation or exchange for another benefit.

(g)

Indemnification. Executive shall be entitled to indemnification with respect to Executive’s services
provided hereunder pursuant to Delaware law, the terms and conditions of Company’s certificate of incorporation and/or by-laws,
and Company’s standard indemnification agreement for directors and officers as executed by Company and Executive. Executive
shall be entitled to coverage under the Company’s Directors’ and Officers’ (“D&O”) insurance policies that it may hold now or in
the future to the same extent and in the same manner (i.e., subject to the same terms and conditions) that the Company’s other
executive officers are entitled to coverage under any of the Company’s D&O insurance policies that it may have.

(h)

Sign-On Bonus. Company shall pay Executive a sign-on bonus (the “Sign-On Bonus”) in the amount
of One Hundred Sixty Four Thousand Dollars ($164,000.00), on the first payroll date following the Start Date, provided that in the
event that Executive resigns Executive’s employment with Company without Good Reason or the Company terminates Executive for
Cause within one (1) year following the Start Date, Executive shall repay Company the amount of the Sign-On Bonus to Company
within fifteen (15) days of Executive’s termination date.  Company shall deduct from the Sign-On Bonus all amounts required to be
deducted or withheld under applicable law or under any employee benefit plan in which Executive participates. Executive hereby
acknowledges  and  agrees  that  any  required  repayment  of  the  Sign-On  Bonus  may  be  deducted  from  payments  to  be  made  by
Company to Executive upon termination, including from the Accrued Obligations.

established by Company generally for senior executives from time to time and any other such policy required by applicable law.

(i)

Forfeiture/Clawback.  All  compensation  shall  be  subject  to  any  forfeiture  or  clawback  policy

5

 
 
 
4.

Payments Upon Termination.

(a)

Definition  of  Accrued  Obligations.    For  purposes  of  this  Agreement,  “Accrued  Obligations”
means:  (i)  the  portion  of  Executive’s  Base  Salary  that  has  accrued  prior  to  any  termination  of  Executive’s  employment  with
Company and has not yet been paid; (ii) any accrued but unused PTO pursuant to Company’s standard policy and practices; and
(iii) the amount of any expenses properly incurred by Executive on behalf of Company prior to any such termination and not yet
reimbursed.  Executive’s entitlement to any other compensation or benefit under any plan of Company shall be governed by and
determined in accordance with the terms of such plans, except as otherwise specified in this Agreement.

(b)

Termination  by  Company  for  Cause.    If  Executive’s  employment  hereunder  is  terminated  by
Company for Cause, then Company shall pay the Accrued Obligations to Executive promptly following the effective date of such
termination and shall have no further obligations with respect to any benefit or compensation under this Agreement to Executive
hereunder.

(c)

Termination  by  Executive  Without  Good  Reason.  If  Executive’s  employment  hereunder  is
terminated by Executive without Good Reason, then Company shall pay the Accrued Obligations and any accrued and unpaid
Annual Performance Bonus for the prior fiscal year to Executive promptly following the effective date of such termination, and
shall have no further obligations with respect to any benefit or compensation under this Agreement to Executive hereunder.  

(d)

Termination as a Result of Executive’s Disability or Death.  If Executive’s employment hereunder
terminates as a result of Executive’s Disability or death, promptly after such termination Company shall pay to Executive: (i) the
Accrued  Obligations;  (ii)  any  accrued  and  unpaid  Annual  Performance  Bonus  for  the  prior  fiscal  year;  and  (iii)  the  Pro  Rated
Bonus  (as  defined  below),  and  shall  have  no  further  obligations  with  respect  to  any  benefit  or  compensation  under  this
Agreement  to  Executive  hereunder.   As  used  in  this  Section  4,  “Pro Rated Bonus”  shall  mean  an  amount  in  cash  equal  to  the
target of Annual Performance Bonus for which Executive would have been eligible with respect to the year in which termination
of  Executive’s  employment  occurs  multiplied  by  a  fraction,  the  numerator  of  which  is  the  number  of  days  during  which
Executive is employed by Company during the year of termination and the denominator of which is 365.

(e)

Termination  by  Company  Without  Cause  or  by  Executive  For  Good  Reason.    In  the  event  that
Executive’s  employment  is  terminated  by  action  of  Company  other  than  for  Cause,  or  Executive  terminates  Executive’s
employment  for  Good  Reason,  then,  in  addition  to  the  Accrued  Obligations  and  any  accrued  and  unpaid  Annual  Performance
Bonus for the prior fiscal year, Executive shall receive the following, subject to the terms and conditions described in Section
4(g) (including Executive’s execution of the Release (as defined herein)):

(i)

Severance  Payments.  Continuation  of  payments  in  an  amount  equal  to  Executive’s  then-
current  Base  Salary  for  a  nine  (9)  month  period,  less  all  customary  and  required  taxes  and  employment-
related deductions, in accordance with Company’s normal payroll practices (provided such payments shall be
made

6

 
 
 
at least monthly), commencing on the first payroll date following the date on which the Release required by
Section 4(g) becomes effective and non-revocable, but not after seventy (70) days following the effective date
of termination from employment; provided, that if the 70th day falls in the calendar year following the year
during which the termination or separation from service occurred, then the payments shall commence in such
subsequent calendar year; provided further that if such payments commence in such subsequent year, the first
such  payment  shall  be  a  lump  sum  in  an  amount  equal  to  the  payments  that  would  have  come  due  since
Employee’s separation from service.

(ii)

Pro Rata Bonus.  Payment of the Pro Rated Bonus, paid to Executive no later than March
15 of the calendar year next preceding the year of termination of employment, after deduction of all amounts
required to be deducted or withheld under applicable law.

(iii)

Benefits  Payments.    Upon  completion  of  appropriate  forms  and  subject  to  applicable
terms  and  conditions  under  the  Consolidated  Omnibus  Budget  Reconciliation  Act  of  1985,  as  amended
(“COBRA”),  Company  shall  continue  to  provide  Executive  medical  insurance  coverage  to  the  same  extent
that  such  insurance  continues  to  be  provided  to  similarly  situated  executives  at  the  time  of  Executive’s
termination with the cost of the regular premium for such benefits shared in the same relative proportion by
Company and Executive as in effect on the last day of employment (the “COBRA Payment”), until the earlier
to occur of: (i) twelve (12) months following Executive’s termination date, or (ii) the date Executive becomes
eligible for medical benefits with another employer.  Notwithstanding the foregoing, if Executive’s COBRA
Payment would cause the applicable group health plan to be discriminatory and, therefore, result in adverse
tax consequences to Executive, Company shall, in lieu of the COBRA Payment, provide Executive with an
equivalent monthly cash payment, minus deduction of all amounts required to be deducted or withheld under
applicable law, for any period of time Executive is eligible to receive the COBRA Payment. Executive shall
bear  full  responsibility  for  applying  for  COBRA  continuation  coverage  and  Company  shall  have  no
obligation to provide Executive such coverage if Executive fails to elect COBRA benefits in a timely fashion.

Payment of the above described severance payments and benefits are expressly conditioned on Executive’s execution

without revocation of the Release and return of Company property under Section 6.

(f)

Termination by Company Without Cause or by Executive For Good Reason Following a Change of
Control.    In  the  event  that  a  Change  of  Control  (as  defined  below)  occurs  and  within  a  period  of  one  (1)  year  following  the
Change  of  Control,  or  ninety  (90)  days  preceding  the  earlier  to  occur  of  a  Change  of  Control  or  the  execution  of  a  definitive
agreement the consummation of which would result in a Change of Control, Executive’s employment is terminated other than for
Cause, or Executive terminates Executive’s employment for Good Reason, then, in addition to the Accrued Obligations and any
accrued and unpaid Annual

7

 
 
 
Performance Bonus for the prior fiscal year, Executive shall receive the following, subject to the terms and conditions described
in Section 4(g) (including Executive’s execution of the Release):

(i)

Lump  Sum  Severance  Payment.    Payment  of  a  lump  sum  amount  equal  to  twelve  (12)
months  of  Executive’s  then-current  Base  Salary  plus  the  Pro  Rated  Bonus,  less  all  customary  and  required
taxes  and  employment-related  deductions,  paid  on  the  first  payroll  date  following  the  date  on  which  the
Release  required  by  Paragraph  4(g)  becomes  effective  and  non-revocable,  but  not  after  seventy  (70)  days
following the effective date of termination from employment.  

(ii)

Equity Acceleration.  (A) All of Executive’s unvested equity awards shall accelerate and
vest immediately on the date of termination of Executive’s employment if such employment commenced at
least twenty-four (24) months prior to a Change of Control, (B) 50% of Executive’s unvested equity awards
shall  vest  immediately  on  the  date  of  termination  of  Executive’s  employment  if  such  employment
commenced fewer than twenty-four (24) months but at least twelve (12) months prior to a Change of Control,
and  (C)  25%  of  Executive’s  unvested  equity  awards  shall  vest  immediately  on  the  date  of  termination  of
Executive’s employment if such employment commenced fewer than twelve (12) months prior to a Change
of Control.

(iii)

Benefit Payments.  Upon completion of appropriate forms and subject to applicable terms
and conditions under COBRA, Company shall continue to provide Executive medical insurance coverage to
the same extent that such insurance continues to be provided to similarly situated executives at the time of
Executive’s  termination  with  the  cost  of  the  regular  premium  for  such  benefits  shared  in  the  same  relative
proportion by Company and Executive as in effect on the last day of employment, until the earlier to occur
of: (i) twelve (12) months following Executive’s termination date, or (ii) the date Executive becomes eligible
for medical benefits with another employer.  Notwithstanding the foregoing, if Executive’s COBRA Payment
would  cause  the  applicable  group  health  plan  to  be  discriminatory  and,  therefore,  result  in  adverse  tax
consequences  to  Executive,  Company  shall,  in  lieu  of  the  COBRA  Payment,  provide  Executive  with  an
equivalent monthly cash payment, minus deduction of all amounts required to be deducted or withheld under
applicable law, for any period of time Executive is eligible to receive the COBRA Payment.  Executive shall
bear  full  responsibility  for  applying  for  COBRA  continuation  coverage  and  Company  shall  have  no
obligation to provide Executive such coverage if Executive fails to elect COBRA benefits in a timely fashion.

Payment of the above described severance payments and benefits are expressly conditioned on Executive’s execution
without revocation of the Release and return of Company property under Section 6. In the event that Executive is eligible for the
severance payments and benefits under this Section 4(f), Executive shall not be eligible for any of the severance payments and
benefits as provided in Section 4(e).

8

 
 
 
As used herein, a “Change of Control” shall mean the occurrence of any of the following events:  (i) Ownership. Any
“Person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) becomes the
“Beneficial Owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of Company representing fifty
percent (50%) or more of the total voting power represented by Company’s then outstanding voting securities (excluding for this
purpose  any  such  voting  securities  held  by  Company,  or  any  affiliate,  parent  or  subsidiary  of  Company,  or  by  any  employee
benefit plan of Company) pursuant to a transaction or a series of related transactions; or (ii) Merger/Sale of Assets.  (A) A merger
or consolidation of Company whether or not approved by the Board, other than a merger or consolidation which would result in
the voting securities of Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding
or by being converted into voting securities of the surviving entity or the parent of such corporation) at least fifty percent (50%)
of the total voting power represented by the voting securities of Company or such surviving entity or parent of such corporation,
as  the  case  may  be,  outstanding  immediately  after  such  merger  or  consolidation;  (B)  or  Company’s  stockholders  approve  an
agreement  for  the  sale  or  disposition  by  Company  of  all  or  substantially  all  of  Company’s  assets;  or  (iii)  Change  in  Board
Composition. A change in the composition of the Board, as a result of which fewer than a majority of the directors are Incumbent
Directors. “Incumbent Directors” shall mean directors who either (A) are directors of Company as of the date of this Agreement,
or  (B)  are  elected,  or  nominated  for  election,  to  the  Board  with  the  affirmative  votes  of  at  least  a  majority  of  the  Incumbent
Directors, or by a committee of the Board made up of at least a majority of the Incumbent Directors, at the time of such election
or  nomination  (but  shall  not  include  an  individual  whose  election  or  nomination  is  in  connection  with  an  actual  or  threatened
proxy contest relating to the election of directors).  

(g)

Execution  of  Release  of  Claims.    Company  shall  not  be  obligated  to  pay  Executive  any  of  the
severance payments or benefits described in this Section 4 unless and until Executive has executed (without revocation) a release
of claims as described below (the “Release”).  The Release shall contain reasonable and customary provisions including a general
release of claims against Company and its affiliated entities and each of their officers, directors and employees as well as mutual
non-disparagement, non-competition, non-solicitation, confidentiality, cooperation and the like.  The Release must be provided to
Executive not later than fifteen (15) days following the effective date of termination of Executive’s employment by Company and
executed by Executive and returned to Company within sixty (60) days after such effective date.  If Executive fails or refuses to
return  the  Release  within  such  60-day  period,  Executive’s  severance  payments  and  benefits  to  be  paid  hereunder  shall  be
forfeited.

(h)

No  Other  Payments  or  Benefits  Owing.    Except  as  expressly  set  forth  herein,  the  payments  and
benefits  set  forth  in  this  Section  4:  (a)    shall  be  the  sole  amounts  owing  to  Executive  upon  termination  of  Executive’s
employment  for  the  reasons  set  forth  above,  and  Executive  shall  not  be  eligible  for  any  other  payments  or  other  forms  of
compensation or benefits; (b) shall be the sole remedy, if any, available to Executive in the event that Executive brings any claim
against Company relating to the termination of Executive’s employment under this Agreement; and (c) shall not be subject to set-
off by Company or any obligation on the part of Executive to mitigate or to offset compensation earned by Executive in other
pursuits  after  termination  of  employment,  other  than  as  specified  herein  with  respect  to  medical  benefits  provided  by  another
employer.

9

 
 
 
5.

Prohibited Competition and Solicitation.  Executive expressly acknowledges that: (a) there are competitive
and proprietary aspects of the business of Company; (b) during the course of Executive’s employment, Company shall furnish,
disclose  or  make  available  to  Executive  confidential  and  proprietary  information  and  may  provide  Executive  with  unique  and
specialized  training;  (c)  such  Confidential  Information  and  training  have  been  developed  and  shall  be  developed  by  Company
through the expenditure of substantial time, effort and money, and could be used by Executive to compete with Company; and (d)
in the course of Executive’s employment, Executive shall be introduced to customers and others with important relationships to
Company,  and  any  and  all  “goodwill”  created  through  such  introductions  belongs  exclusively  to  Company,  including,  but  not
limited to, any goodwill created as a result of direct or indirect contacts or relationships between Executive and any customers of
Company.  In light of the foregoing acknowledgements, and as a condition of employment hereunder, Executive hereby approves
the  Restrictive  Covenant  Agreement  entered  into  on  the  date  hereof  as  a  binding  obligation  of  the  Executive,  enforceable  in
accordance with its terms.  

6.

Property and Records. Upon the termination of Executive’s employment hereunder for any reason or for no
reason, or if Company otherwise requests, Executive shall:  (a) return to Company all tangible business information and copies
thereof  (regardless  how  such  Confidential  Information  or  copies  are  maintained),  and  (b)  deliver  to  Company  any  property  of
Company which may be in Executive’s possession, including, but not limited to, Blackberry-type devices, smart phones, laptops,
cell phones (the foregoing, “electronic devices”), products, materials, memoranda, notes, records, reports or other documents or
photocopies  of  the  same.    Executive  may  retain  copies  of  any  exclusively  personal  data  contained  in  or  on  Company-owned
electronic  devices  returned  to  Company  pursuant  to  the  foregoing.  The  foregoing  notwithstanding,  Executive  understands  and
agrees that Company property belongs exclusively to Company, it should be used for Company business, and Executive has no
reasonable expectation of privacy on any Company property or with respect to any information stored thereon.

7.

Cooperation.  During and after Executive’s employment, Executive shall fully cooperate with Company to
the extent reasonable in the defense or prosecution of any claims or actions now in existence or which may be brought in the
future  against  or  on  behalf  of  Company  (other  than  claims  directly  or  indirectly  against  Executive)  which  relate  to  events  or
occurrences that transpired while Executive was employed by Company. Executive’s cooperation in connection with such claims
or actions shall include, but not be limited to, being available to meet with counsel to prepare for discovery or trial and to act as a
witness on behalf of Company at mutually convenient times. During and after Executive’s employment, Executive also shall fully
cooperate  with  Company  to  the  extent  reasonable  in  connection  with  any  investigation  or  review  of  any  federal,  state  or  local
regulatory  authority  as  any  such  investigation  or  review  relates  to  events  or  occurrences  that  transpired  while  Executive  was
employed by Company.  Company shall reimburse Executive for any reasonable out-of-pocket expenses incurred in connection
with the Executive’s performance of obligations pursuant to this section. In addition, Company shall compensate Executive on an
hourly basis, based on a rate commensurate with Executive’s Base Salary in effect prior to termination, for time Executive spends
in excess of 10 hours in any calendar quarter providing services to the Corporation after termination.

10

 
 
 
 
8.

Code Sections 409A and 280G.  

qualified deferred compensation” subject to Section 409A, then the following conditions apply to such payments or benefits:

(a)

In the event that the payments or benefits set forth in Section 4 of this Agreement constitute “non-

(i)

Any termination of Executive’s employment triggering payment of benefits under Section
4  must  constitute  a  “separation  from  service”  under  Section  409A(a)(2)(A)(i)  of  the  Code  and  Treas.  Reg.
§1.409A-1(h)  before  distribution  of  such  benefits  can  commence.    To  the  extent  that  the  termination  of
Executive’s  employment  does  not  constitute  a  separation  of  service  under  Section  409A(a)(2)(A)(i)  of  the
Code  and  Treas.  Reg.  §1.409A-1(h)  (as  the  result  of  further  services  that  are  reasonably  anticipated  to  be
provided  by  Executive  to  Company  at  the  time  Executive’s  employment  terminates),  any  such  payments
under  Section  4  that  constitute  deferred  compensation  under  Section  409A  shall  be  delayed  until  after  the
date of a subsequent event constituting a separation of service under Section 409A(a)(2)(A)(i) of the Code
and Treas. Reg. §1.409A-1(h).  For purposes of clarification, this Section 8(a) shall not cause any forfeiture
of benefits on Executive’s part, but shall only act as a delay until such time as a “separation from service”
occurs.  

(ii)

Notwithstanding any other provision with respect to the timing of payments under Section
4 if, at the time of Executive’s termination, Executive is deemed to be a “specified employee” of Company
(within  the  meaning  of  Section  409A(a)(2)(B)(i)  of  the  Code),  then  limited  only  to  the  extent  necessary  to
comply with the requirements of Section 409A, any payments to which Executive may become entitled under
Section  4  which  are  subject  to  Section  409A  (and  not  otherwise  exempt  from  its  application)  shall  be
withheld until the first (1st) business day of the seventh (7th) month following the termination of Executive’s
employment,  at  which  time  Executive  shall  be  paid  an  aggregate  amount  equal  to  the  accumulated,  but
unpaid, payments otherwise due to Executive under the terms of Section 4.

(b)

It is intended that each installment of the payments and benefits provided under Section 4 of this
Agreement shall be treated as a separate “payment” for purposes of Section 409A.  Neither Company nor Executive shall have
the  right  to  accelerate  or  defer  the  delivery  of  any  such  payments  or  benefits  except  to  the  extent  specifically  permitted  or
required by Section 409A.

(c)

Notwithstanding  any  other  provision  of  this  Agreement  to  the  contrary,  this   Agreement  shall  be
interpreted and at all times administered in a manner that avoids the inclusion of compensation in income under Section 409A, or
the payment of increased taxes, excise taxes or other penalties under Section 409A. The parties intend this Agreement to be in
compliance with Section 409A.  Executive acknowledges and agrees that Company does not guarantee the tax treatment or tax
consequences associated with any payment or benefit arising under this Agreement, including but not limited to consequences
related to Section 409A.

11

 
 
 
(d)

If any payment or benefit Executive would receive under this Agreement, when combined with any
other payment or benefit Executive receives pursuant to a Change of Control (for purposes of this section, a “Payment”) would:
(i) constitute a “parachute payment” within the meaning of Section 280G the Code; and (ii) but for this sentence, be subject to the
excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then such Payment shall be either: (A) the full amount of
such Payment; or (B) such lesser amount (with cash payments being reduced before stock option compensation) as would result
in  no  portion  of  the  Payment  being  subject  to  the  Excise  Tax,  whichever  of  the  foregoing  amounts,  taking  into  account  the
applicable  federal,  state  and  local  employments  taxes,  income  taxes,  and  the  Excise  Tax,  results  in  Executive’s  receipt,  on  an
after-tax basis, of the greater amount of the Payment notwithstanding that all or some portion of the Payment may be subject to
the Excise Tax.  Notwithstanding the foregoing, if, prior to the closing of an initial public offering, any Payment can be exempt
from the definition of “parachute payment” and the Excise Tax pursuant to the shareholder approval requirements described in
Treas.  Regs.  §  1.280G-1,  Q&A  6,  the  Company  will,  at  the  Executive’s  election  (and  subject  to  the  Executive  signing  an
appropriate  waiver)  seek  shareholder  approval  to  exempt  such  Payment  from  the  definition  of  “parachute  payment”  and  the
Excise Tax.

9.

General.

(a)

Notices.  Except as otherwise specifically provided herein, any notice required or permitted by this
Agreement shall be in writing and shall be delivered as follows with notice deemed given as indicated: (i) by personal delivery
when  delivered  personally;  (ii)  by  overnight  courier  upon  written  verification  of  receipt;  (iii)  by  telecopy  or  facsimile
transmission  upon  acknowledgment  of  receipt  of  electronic  transmission;  or  (iv)  by  certified  or  registered  mail,  return  receipt
requested, upon verification of receipt.

•

•

Notices to Executive shall be sent to the last known address in Company’s records or such other address as
Executive may specify in writing.

Notices to Company shall be sent to:  

Spero Therapeutics, Inc.
675 Massachusetts Ave., 14th Floor
Cambridge, MA 02139
Attn: CEO

amended only by written agreement executed by the parties hereto.

(b)

Modifications and Amendments.  The terms and provisions of this Agreement may be modified or

(c)

Waivers and Consents.  The terms and provisions of this Agreement may be waived, or consent for
the  departure  therefrom  granted,  only  by  a  written  document  executed  by  the  party  entitled  to  the  benefits  of  such  terms  or
provisions.  No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other
terms or provisions of this Agreement, whether or not similar.  Each such waiver or consent shall be effective only in the specific
instance and for the purpose for which it was given and shall not constitute a continuing waiver or consent.

12

 
 
 
 
 
 
(d)

Assignment.  Company may assign its rights and obligations hereunder to any person or entity that
succeeds to all or substantially all of Company’s business or that aspect of Company’s business in which Executive is principally
involved.  Executive may not assign Executive’s rights and obligations under this Agreement without the prior written consent of
Company.

(e)

Governing Law/Dispute Resolution.  This Agreement and the rights and obligations of the parties
hereunder shall be construed in accordance with and governed by the law of the Commonwealth of Massachusetts without giving
effect to the conflict of law principles thereof.  Any legal action or proceeding with respect to this Agreement shall be brought in
the  courts  of  the  Commonwealth  of  Massachusetts  or  of  the  United  States  of  America  for  the  District  of  Massachusetts.  By
execution and delivery of this Agreement, each of the parties hereto accepts for itself and in respect of its property, generally and
unconditionally, the non-exclusive jurisdiction of the aforesaid courts.

Jury Waiver. ANY, ACTION, DEMAND, CLAIM, OR COUNTERCLAIM ARISING UNDER OR
RELATING  TO  THIS  AGREEMENT  SHALL  BE  RESOLVED  BY  A  JUDGE  ALONE,  AND  EACH  OF  COMPANY  AND
EXECUTIVE WAIVES ANY RIGHT TO A JURY TRIAL THEREOF.

(f)

Headings and Captions.  The headings and captions of the various subdivisions of this Agreement
are for convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or
provisions hereof.

(g)

(h)

Entire  Agreement.  This  Agreement,  together  with  the  other  agreements  specifically  referenced
herein, embodies the entire agreement and understanding between the parties hereto with respect to the subject matter hereof and
supersedes  all  prior  oral  or  written  agreements  and  understandings  relating  to  the  subject  matter  hereof.  No  statement,
representation, warranty, covenant or agreement of any kind not expressly set forth in this Agreement shall affect, or be used to
interpret, change or restrict, the express terms and provisions of this Agreement.

Counterparts.  This  Agreement  may  be  executed  in  two  or  more  counterparts,  and  by  different
parties hereto on separate counterparts, each of which shall be deemed an original, but all of which together shall constitute one
and the same instrument.  For all purposes a signature by fax shall be treated as an original.

(i)

[Signature Page to Follow]

13

 
 
 
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first written above.

SATYAVRAT SHUKLA

SPERO THERAPEUTICS, INC.

/s/ Satyavrat Shukla
Signature

By:

/s/ Ankit Mahadevia
Name: Ankit Mahadevia
Title: CEO

14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.13

This Executive Employment Agreement (this “Agreement”) is made and entered into this 6th day of November, 2020
(the  “Effective  Date”)  by  and  between  Spero  Therapeutics,  Inc.,  a  Delaware  corporation  (“Company”),  and  Tamara  Joseph
(“Executive”).

WHEREAS, Executive and Company desire to set forth the terms and conditions for the employment of the Executive
by  the  Company  to  assure  the  harmonious  performance  of  the  affairs  of  Company  as  well  as  to  enter  into  a  Proprietary
Information and Inventions Assignment Agreement (the “Restrictive Covenant Agreement”).

NOW, THEREFORE,  in  consideration  of  the  mutual  promises,  terms,  provisions,  and  conditions  contained  herein,

Company and Executive hereby agree as follows:  

1.

Roles and Duties.  Subject to the terms and conditions of this Agreement, Company shall employ Executive
as its Chief Legal Officer (“CLO”) reporting to Company’s Chief Executive Officer (“CEO”).   The  Executive  shall  have  such
duties and responsibilities as are reasonably determined by the Board of Directors (“Board”) and are consistent with the duties
customarily performed by a CLO of a similarly situated company in the United States.  Executive accepts such employment upon
the  terms  and  conditions  set  forth  herein,  and  agrees  to  perform  such  duties  and  discharge  such  responsibilities  to  the  best  of
Executive’s ability. During Executive’s employment, Executive shall devote all of Executive’s business time and energies to the
business  and  affairs  of  Company.    Notwithstanding  the  foregoing,  nothing  herein  shall  preclude  Executive  from:  (i)  providing
consulting services to Millendo Therapeutics US, Inc., up to a maximum of five (5) hours per week, through January 31, 2021;
(ii) performing services for such other companies as Company may designate or permit; (iii) serving on the board of directors of
the  non-profit  organization  Heluna  Health  and,  with  the  prior  written  consent  of  the  Board,  which  consent  shall  not  be
unreasonably withheld, otherwise serving as a member of the boards of directors or advisory boards (or their equivalents in the
case  of  a  non-corporate  entity)  of  non-competing  businesses  or  charitable,  educational  or  civic  organizations;  (iv)  engaging  in
charitable activities and community affairs; and (v) managing Executive’s personal investments and affairs; provided, however,
that  the  activities  set  out  in  clauses  (i),  (ii),  (iii),  (iv)  and  (v)  shall  be  limited  by  Executive  so  as  not  to  materially  interfere,
individually or in the aggregate, with the performance of Executive's duties and responsibilities hereunder..

2.

Term of Employment.

Term.    Subject  to  the  terms  hereof,  Executive’s  employment  hereunder  shall  commence  on
December 2, 2020 (the “Start Date”) and continue until terminated hereunder by either party (such term of employment referred
to herein as the “Term”).

(a)

hereunder shall terminate upon the earliest to occur of the following:

(b)

Termination. Notwithstanding anything else contained in this Agreement, Executive’s employment

(i)

Death.  Immediately upon Executive’s death;

 
 
 
(ii)

Termination by Company.

(A)

If because of Executive’s Disability (as defined below in Section 2(c)), written
notice  by  Company  to  Executive  that  Executive’s  employment  is  being  terminated  as  a  result  of
Executive’s Disability, which termination shall be effective on the date of such notice or such later
date as specified in writing by Company;

(B)

If  for  Cause  (as  defined  below  in  Section  2(d)),  written  notice  by  Company  to
Executive that Executive’s employment is being terminated for Cause, which termination shall be
effective on the date of such notice or such later date as specified in writing by Company, provided
that if prior to the effective date of such termination Executive has cured the circumstances giving
rise to the Cause (if capable of being cured as provided in Section 2(d)), then such termination shall
not be effective; or

(C)

If by Company for reasons other than under Sections 2(b)(ii)(A) or (B), written
notice  by  Company  to  Executive  that  Executive’s  employment  is  being  terminated,  which
termination shall be effective thirty (30) days after the date of such notice.

(iii)

Termination by Executive.  

(A)

If  for  Good  Reason  (as  defined  below  in  Section  2(e)),  written  notice  by
Executive to Company that Executive is terminating Executive’s employment for Good Reason and
that  sets  forth  the  factual  basis  supporting  the  alleged  Good  Reason,  which  termination  shall  be
effective thirty (30) days after the date of such notice; provided that if prior to the effective date of
such termination Company has cured the circumstances giving rise to the Good Reason if capable
of being cured as provided in Section 2(e), then such termination shall not be effective; or

(B)

If without Good Reason, written notice by Executive to Company that Executive
is  terminating  Executive’s  employment,  which  termination  shall  be  effective  no  fewer  than  sixty
(60) days after the date of such notice unless waived, in whole or in part, by Company.

Notwithstanding  anything  in  this  Section  2(b),  Company  may  at  any  point,  under  the  conditions  set  forth  in  Section
2(b)(ii)(B),  terminate  Executive’s  employment  for  Cause  prior  to  the  effective  date  of  any  other  termination  contemplated
hereunder; provided that if prior to the effective date of such for-Cause termination Executive has cured the circumstances giving
rise to the Cause (if capable of being cured as provided in Section 2(d)), then such termination shall not be effective.   

Definition of “Disability”.    For  purposes  of  this  Agreement,  “Disability”  shall  mean  Executive’s
incapacity  or  inability  to  perform  Executive’s  duties  and  responsibilities  as  contemplated  herein  by  reason  of  a  medically
determinable mental or physical impairment for one

(c)

2

 
 
 
hundred twenty (120) days or more within any one (1) year period (cumulative or consecutive), which impairment can reasonably
be  expected  to  result  in  death  or  can  be  expected  to  last  for  a  continuous  period  of  not  less  than  six  (6)  months.    The
determination  that  Executive  is  disabled  hereunder,  if  disputed  by  the  parties,  shall  be  resolved  by  a  physician  reasonably
satisfactory  to  Executive  and  Company,  at  Company’s  expense,  and  the  determination  of  such  physician  shall  be  final  and
binding  upon  both  Executive  and  Company.  Executive  hereby  consents  to  such  examination  and  consultation  by  a  physician.
Company shall keep all information it receives as a result of such inquiry and determination confidential and shall not use it for
any purpose other than in connection with exercising its rights under this Agreement.

(d)

Definition  of  “Cause”.  As  used  herein,  “Cause”  shall  mean:  (i)  Executive’s  conviction  of  (A)  a
felony or (B) any misdemeanor involving moral turpitude, deceit, dishonesty or fraud; (ii) Executive’s willful failure or refusal to
comply with lawful directions of the CEO, which failure or refusal continues for more than thirty (30) days after written notice is
given to Executive by the CEO, which notice sets forth in reasonable detail the nature of such failure or refusal; (iii) willful and
material breach by Executive of a written Company policy applicable to Executive or Executive’s covenants and/or obligations
under  this  Agreement  or  the  material  breach  of  the  Restrictive  Covenant  Agreement;  and/or  (iv)  material  misconduct  by
Executive  that  seriously  discredits  or  damages  Company  or  any  of  its  affiliates.    Except  in  the  case  of  (ii)  above,  it  is  not
necessary  that  the  Company’s  finding  of  Cause  occur  prior  to  Executive’s  termination  of  service.    If  Company  determines,
subsequent  to  Executive’s  termination  of  service,  that  prior  to  Executive’s  termination  Executive  engaged  in  conduct  which
would constitute “Cause,” (other than pursuant to (ii) above) then Executive shall have no right to any benefit or compensation
under this Agreement.  

(e)

Definition  of  “Good  Reason”.  As  used  herein,  “Good  Reason”  shall  mean:  (i)  relocation  of
Executive’s principal business location to a location more than thirty (30) miles from Executive’s then-current business location;
(ii) a material diminution in Executive’s duties, authority or responsibilities; (iii) a material reduction in Executive’s Base Salary;
or (iv) willful and material breach by Company of its covenants and/or obligations under this Agreement; provided that, in each
of the foregoing clauses (i) through (iv) (A) Executive provides Company with written notice that Executive intends to terminate
Executive’s employment hereunder for one of the grounds set forth in this Section 2(e) within thirty (30) days of such ground
occurring, (B) if such ground is capable of being cured, Company has failed to cure such ground within a period of thirty (30)
days from the date of such written notice, and (C) Executive terminates by written notice Executive’s employment within sixty-
five (65) days from the date that Executive provides the notice contemplated by clause (A) of this Section 2(e).  For purposes of
clarification, the above-listed conditions shall apply separately to each occurrence of Good Reason, and failure to adhere to such
conditions  in  the  event  of  Good  Reason  shall  not  disqualify  Executive  from  asserting  Good  Reason  for  any  subsequent
occurrence of Good Reason. In addition, Executive may terminate Executive’s employment for Good Reason within one (1) year
following  a  Change  of  Control  (as  defined  below)  if,  after  the  Change  of  Control,  Executive  is  not  an  executive  of  the  parent
company,  provided  that  Executive’s  roles,  responsibilities  and  scope  of  authority  within  the  subsidiary  are  not  comparable  to
Executive’s  roles,  responsibilities  and  scope  of  authority  with  Company  prior  to  the  Change  of  Control.  For  purposes  of  this
Agreement, “Good Reason” shall be interpreted in a manner, and limited to the extent necessary, so that it shall not cause adverse
tax

3

 
 
 
consequences for either party with respect to Section 409A (“Section 409A”) of the Internal Revenue Code of 1986, as amended
(the “Code”) and any successor statute, regulation and guidance thereto.

3.

Compensation.

(a)

Base  Salary.    Commencing  on  the  Start  Date  Company  shall  pay  Executive  a  base  salary  (the
“Base  Salary”)  at  the  annual  rate  of  Three  Hundred  Eighty  Five  Thousand  Dollars  ($385,000.00).  The  Base  Salary  shall  be
payable  in  substantially  equal  periodic  installments  in  accordance  with  Company’s  payroll  practices  as  in  effect  from  time  to
time.  Company shall deduct from each such installment all amounts required to be deducted or withheld under applicable law or
under  any  employee  benefit  plan  in  which  Executive  participates.  The  Board  or  an  appropriate  committee  thereof  shall,  on  an
annual basis, review the Base Salary, which may be adjusted upward (but not downward) at Company’s discretion.

(b)

Annual  Performance  Bonus.    Commencing  with  fiscal  year  2021,  Executive  shall  be  eligible  to
receive  an  annual  cash  bonus  (the  “Annual Performance Bonus”),  with  the  target  amount  of  such  Annual  Performance  Bonus
equal to forty percent (40%) of Executive’s Base Salary in the year to which the Annual Performance Bonus relates; provided
that  the  actual  amount  of  the  Annual  Performance  Bonus  may  be  greater  or  less  than  such  target  amount.   The  amount  of  the
Annual Performance Bonus shall be determined by the Board or an appropriate committee thereof in its sole discretion, and shall
be  paid  to  Executive  no  later  than  March  15th  of  the  calendar  year  immediately  following  the  calendar  year  in  which  it  was
earned.  Except as provided in Section 4, Executive must be employed by Company on the last day of the applicable fiscal year to
which  the  Annual  Performance  Bonus  relates  in  order  to  be  eligible  for,  and  to  be  deemed  as  having  earned,  such  Annual
Performance Bonus. Company shall deduct from the Annual Performance Bonus all amounts required to be deducted or withheld
under applicable law or under any employee benefit plan in which Executive participates.

(c)

Equity.  As  a  material  inducement  to  the  Executive  joining  the  Company,  on  the  Start  Date,  the
Company shall award Executive an inducement stock option to purchase 75,000 shares of the Company’s common stock, subject
to approval by the Board or an authorized delegate thereof (the “Inducement Option Grant”). The Inducement Option Grant will
be subject to the terms and conditions of the Company’s 2019 Inducement Equity Incentive Plan, as amended, and the applicable
option  agreement  between  the  Executive  and  the  Company  entered  into  pursuant  thereto.    The  Inducement  OptionGrant  is
intended as an inducement grant under Nasdaq Rule 5635(c)(4) and will not qualify as an incentive stock option.  The exercise
price of the stock options subject to the Inducement Option Grant shall be the closing price of the Company’s common stock on
the Nasdaq Stock Market on the Start Date. The Inducement Option Grant shall be evidenced in writing by, and subject to the
terms of, a Company stock option agreement which shall specify vesting over four (4) years, 25% on the first anniversary of the
Start Date with the balance to vest in equal monthly installments over the following 36 months, and exercise of vested options for
up to ten (10) years except as otherwise provided in the stock option agreement. Commencing in fiscal year 2022, Executive shall
be  eligible  to  be  considered  for  the  grant  of  stock  options  and/or  other  equity-based  awards  commensurate  with  Executive’s
position and responsibilities. The amount, terms and conditions of any stock option or other equity-based award

4

 
 
 
shall be determined by the Board or an appropriate committee thereof in its discretion and set forth in the applicable equity plan
and other documents governing the award.

Paid Time Off.  In addition to standard paid holidays, Executive may take up to twenty (20) days of
paid time off (“PTO”) per year, to be scheduled so as not to materially disrupt Company’s operations, pursuant to the terms and
conditions of Company policy and practices as applied to Company senior executives.  

(d)

(e)

Fringe  Benefits.  Executive  shall  be  entitled  to  participate  in  all  benefit/welfare  plans  and  fringe
benefits  provided  to  Company  senior  executives.    Executive  understands  that,  except  when  prohibited  by  applicable  law,
Company’s benefit plans and fringe benefits may be amended by Company from time to time in its sole discretion.  The terms of
any such benefits shall be governed by the applicable plan documents and Company policies in effect from time to time.

(f)

Reimbursement of Expenses.  Company shall reimburse Executive for all ordinary and reasonable
out-of-pocket  business  expenses  incurred  by  Executive  in  furtherance  of  Company’s  business  in  accordance  with  Company’s
policies with respect thereto as in effect from time to time.  Executive must submit any request for reimbursement no later than
ninety (90) days following the date that such business expense is incurred. All reimbursements provided under this Agreement
shall be made or provided in accordance with the requirements of Section 409A including, where applicable, the requirement that
(i) any reimbursement is for expenses incurred during Executive’s lifetime (or during a shorter period of time specified in this
Agreement); (ii) the amount of expenses eligible for reimbursement during a calendar year may not affect the expenses eligible
for reimbursement in any other calendar year; (iii) the reimbursement of an eligible expense shall be made no later than the last
day  of  the  calendar  year  following  the  year  in  which  the  expense  is  incurred;  and  (iv)  the  right  to  reimbursement  or  in-kind
benefits is not subject to liquidation or exchange for another benefit.

(g)

Indemnification. Executive shall be entitled to indemnification with respect to Executive’s services
provided hereunder pursuant to Delaware law, the terms and conditions of Company’s certificate of incorporation and/or by-laws,
and Company’s standard indemnification agreement for directors and officers as executed by Company and Executive. Executive
shall be entitled to coverage under the Company’s Directors’ and Officers’ (“D&O”) insurance policies that it may hold now or in
the future to the same extent and in the same manner (i.e., subject to the same terms and conditions) that the Company’s other
executive officers are entitled to coverage under any of the Company’s D&O insurance policies that it may have.

established by Company generally for senior executives from time to time and any other such policy required by applicable law.

(h)

Forfeiture/Clawback.  All  compensation  shall  be  subject  to  any  forfeiture  or  clawback  policy

4.

Payments Upon Termination.

Definition  of  Accrued  Obligations.    For  purposes  of  this  Agreement,  “Accrued  Obligations”
means:  (i)  the  portion  of  Executive’s  Base  Salary  that  has  accrued  prior  to  any  termination  of  Executive’s  employment  with
Company and has not yet been paid; (ii) any

(a)

5

 
 
 
accrued  but  unused  PTO pursuant  to  Company’s  standard  policy  and  practices; and (iii)  the  amount  of  any  expenses  properly
incurred by Executive on behalf of Company prior to any such termination and not yet reimbursed.  Executive’s entitlement to
any other compensation or benefit under any plan of Company shall be governed by and determined in accordance with the terms
of such plans, except as otherwise specified in this Agreement.

(b)

Termination  by  Company  for  Cause.    If  Executive’s  employment  hereunder  is  terminated  by
Company for Cause, then Company shall pay the Accrued Obligations to Executive promptly following the effective date of such
termination and shall have no further obligations with respect to any benefit or compensation under this Agreement to Executive
hereunder.

(c)

Termination  by  Executive  Without  Good  Reason.  If  Executive’s  employment  hereunder  is
terminated by Executive without Good Reason, then Company shall pay the Accrued Obligations and any accrued and unpaid
Annual Performance Bonus for the prior fiscal year to Executive promptly following the effective date of such termination and
shall have no further obligations with respect to any benefit or compensation under this Agreement to Executive hereunder.

(d)

Termination as a Result of Executive’s Disability or Death.  If Executive’s employment hereunder
terminates as a result of Executive’s Disability or death, promptly after such termination Company shall pay to Executive (i) the
Accrued  Obligations;  (ii)  any  accrued  and  unpaid  Annual  Performance  Bonus  for  the  prior  fiscal  year;  and  (iii)  the  Pro  Rated
Bonus  (as  defined  below)  and,  shall  have  no  further  obligations  with  respect  to  any  benefit  or  compensation  under  this
Agreement  to  Executive  hereunder.   As  used  in  this  Section  4,  “Pro  Rated  Bonus”  shall  mean  an  amount  in  cash  equal  to  the
target of Annual Performance Bonus for which Executive would have been eligible with respect to the year in which termination
of  Executive’s  employment  occurs  multiplied  by  a  fraction,  the  numerator  of  which  is  the  number  of  days  during  which
Executive is employed by Company during the year of termination and the denominator of which is 365.

(e)

Termination  by  Company  Without  Cause  or  by  Executive  For  Good  Reason.    In  the  event  that
Executive’s  employment  is  terminated  by  action  of  Company  other  than  for  Cause,  or  Executive  terminates  Executive’s
employment  for  Good  Reason,  then,  in  addition  to  the  Accrued  Obligations  and  any  accrued  and  unpaid  Annual  Performance
Bonus for the prior fiscal year, Executive shall receive the following, subject to the terms and conditions described in Section
4(g) (including Executive’s execution of the Release (as defined herein)):

(i)

Severance  Payments.  Continuation  of  payments  in  an  amount  equal  to  Executive’s  then-
current  Base  Salary  for  a  nine  (9)  month  period,  less  all  customary  and  required  taxes  and  employment-
related deductions, in accordance with Company’s normal payroll practices (provided such payments shall be
made  at  least  monthly),  commencing  on  the  first  payroll  date  following  the  date  on  which  the  Release
required by Section 4(g) becomes effective and non-revocable, but not after seventy (70) days following the
effective  date  of  termination  from  employment;  provided,  that  if  the  70th  day  falls  in  the  calendar  year
following the year during which the termination or separation from service occurred, then the

6

 
 
 
payments  shall  commence  in  such  subsequent  calendar  year;  provided  further  that  if  such  payments
commence  in  such  subsequent  year,  the  first  such  payment  shall  be  a  lump  sum  in  an  amount  equal  to  the
payments that would have come due since Employee’s separation from service.

(ii)

Pro Rata Bonus.  Payment of the Pro Rated Bonus, paid to Executive no later than March
15 of the calendar year next preceding the year of termination of employment, after deduction of all amounts
required to be deducted or withheld under applicable law.

(iii)

Benefits  Payments.    Upon  completion  of  appropriate  forms  and  subject  to  applicable
terms  and  conditions  under  the  Consolidated  Omnibus  Budget  Reconciliation  Act  of  1985,  as  amended
(“COBRA”),  Company  shall  continue  to  provide  Executive  medical  insurance  coverage  to  the  same  extent
that  such  insurance  continues  to  be  provided  to  similarly  situated  executives  at  the  time  of  Executive’s
termination with the cost of the regular premium for such benefits shared in the same relative proportion by
Company and Executive as in effect on the last day of employment (the “COBRA Payment”), until the earlier
to occur of: (i) twelve (12) months following Executive’s termination date, or (ii) the date Executive becomes
eligible for medical benefits with another employer.  Notwithstanding the foregoing, if Executive’s COBRA
Payment would cause the applicable group health plan to be discriminatory and, therefore, result in adverse
tax consequences to Executive, Company shall, in lieu of the COBRA Payment, provide Executive with an
equivalent monthly cash payment, minus deduction of all amounts required to be deducted or withheld under
applicable law, for any period of time Executive is eligible to receive the COBRA Payment. Executive shall
bear  full  responsibility  for  applying  for  COBRA  continuation  coverage  and  Company  shall  have  no
obligation to provide Executive such coverage if Executive fails to elect COBRA benefits in a timely fashion.

Payment of the above described severance payments and benefits are expressly conditioned on Executive’s execution

without revocation of the Release and return of Company property under Section 6.

(f)

Termination by Company Without Cause or by Executive For Good Reason Following a Change of
Control.    In  the  event  that  a  Change  of  Control  (as  defined  below)  occurs  and  within  a  period  of  one  (1)  year  following  the
Change  of  Control,  or  ninety  (90)  days  preceding  the  earlier  to  occur  of  a  Change  of  Control  or  the  execution  of  a  definitive
agreement the consummation of which would result in a Change of Control, Executive’s employment is terminated other than for
Cause, or Executive terminates Executive’s employment for Good Reason, then, in addition to the Accrued Obligations and any
accrued  and  unpaid  Annual  Performance  Bonus  for  the  prior  fiscal  year,  Executive  shall  receive  the  following,  subject  to  the
terms and conditions described in Section 4(g) (including Executive’s execution of the Release):

(i)

Lump  Sum  Severance  Payment.  Payment  of  a  lump  sum  amount  equal  to  twelve  (12)
months  of  Executive’s  then-current  Base  Salary  plus  the  Pro  Rated  Bonus,  less  all  customary  and  required
taxes and employment-related

7

 
 
 
deductions, paid on the first payroll date following the date on which the Release required by Paragraph 4(g)
becomes  effective  and  non-revocable,  but  not  after  seventy  (70)  days  following  the  effective  date  of
termination from employment.  

(ii)

Equity Acceleration. (A)  All  of  Executive’s  unvested  equity  awards  shall  accelerate  and
vest immediately on the date of termination of Executive’s employment if such employment commenced at
least twenty-four (24) months prior to a Change of Control, (B) 50% of Executive’s unvested equity awards
shall  vest  immediately  on  the  date  of  termination  of  Executive’s  employment  if  such  employment
commenced fewer than twenty-four (24) months but at least twelve (12) months prior to a Change of Control,
and  (C)  25%  of  Executive’s  unvested  equity  awards  shall  vest  immediately  on  the  date  of  termination  of
Executive’s employment if such employment commenced fewer than twelve (12) months prior to a Change
of Control.

(iii)

Benefit Payments.  Upon completion of appropriate forms and subject to applicable terms
and conditions under COBRA, Company shall continue to provide Executive medical insurance coverage to
the same extent that such insurance continues to be provided to similarly situated executives at the time of
Executive’s  termination  with  the  cost  of  the  regular  premium  for  such  benefits  shared  in  the  same  relative
proportion by Company and Executive as in effect on the last day of employment, until the earlier to occur
of: (i) twelve (12) months following Executive’s termination date, or (ii) the date Executive becomes eligible
for medical benefits with another employer. Notwithstanding the foregoing, if Executive’s COBRA Payment
would  cause  the  applicable  group  health  plan  to  be  discriminatory  and,  therefore,  result  in  adverse  tax
consequences  to  Executive,  Company  shall,  in  lieu  of  the  COBRA  Payment,  provide  Executive  with  an
equivalent monthly cash payment, minus deduction of all amounts required to be deducted or withheld under
applicable law, for any period of time Executive is eligible to receive the COBRA Payment.  Executive shall
bear  full  responsibility  for  applying  for  COBRA  continuation  coverage  and  Company  shall  have  no
obligation to provide Executive such coverage if Executive fails to elect COBRA benefits in a timely fashion.

Payment of the above described severance payments and benefits are expressly conditioned on Executive’s execution
without revocation of the Release and return of Company property under Section 6. In the event that Executive is eligible for the
severance payments and benefits under this Section 4(f), Executive shall not be eligible for any of the severance payments and
benefits as provided in Section 4(e).

As used herein, a “Change of Control” shall mean the occurrence of any of the following events: (i) Ownership. Any
“Person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) becomes the
“Beneficial Owner” (as defined in Rule 13d-3 under said Act), directly or indirectly, of securities of Company representing fifty
percent (50%) or more of the total voting power represented by Company’s then outstanding voting securities (excluding for this
purpose  any  such  voting  securities  held  by  Company,  or  any  affiliate,  parent  or  subsidiary  of  Company,  or  by  any  employee
benefit plan of Company) pursuant

8

 
 
 
to  a  transaction  or  a  series  of  related  transactions;  or  (ii)  Merger/Sale  of  Assets.  (A)  A  merger  or  consolidation  of  Company
whether  or  not  approved  by  the  Board,  other  than  a  merger  or  consolidation  which  would  result  in  the  voting  securities  of
Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted
into  voting  securities  of  the  surviving  entity  or  the  parent  of  such  corporation)  at  least  fifty percent (50%)  of  the  total  voting
power represented by the voting securities of Company or such surviving entity or parent of such corporation, as the case may be,
outstanding immediately after such merger or consolidation; (B) or Company’s stockholders approve an agreement for the sale or
disposition by Company of all or substantially all of Company’s assets; or (iii) Change in Board Composition. A change in the
composition  of  the  Board,  as  a  result  of  which  fewer  than  a  majority  of  the  directors  are  Incumbent  Directors.  “Incumbent
Directors” shall mean directors who either (A) are directors of Company as of the date of this Agreement, or (B) are elected, or
nominated  for  election,  to  the  Board  with  the  affirmative  votes  of  at  least  a  majority  of  the  Incumbent  Directors,  or  by  a
committee of the Board made up of at least a majority of the Incumbent Directors, at the time of such election or nomination (but
shall not include an individual whose election or nomination is in connection with an actual or threatened proxy contest relating
to the election of directors).

(g)

Execution  of  Release  of  Claims.  Company  shall  not  be  obligated  to  pay  Executive  any  of  the
severance payments or benefits described in this Section 4 unless and until Executive has executed (without revocation) a release
of claims as described below (the “Release”).  The Release shall contain reasonable and customary provisions including a general
release of claims against Company and its affiliated entities and each of their officers, directors and employees as well as mutual
non-disparagement, non-competition, non-solicitation, confidentiality, cooperation and the like.  The Release must be provided to
Executive not later than fifteen (15) days following the effective date of termination of Executive’s employment by Company and
executed by Executive and returned to Company within sixty (60) days after such effective date.  If Executive fails or refuses to
return  the  Release  within  such  60-day  period,  Executive’s  severance  payments  and  benefits  to  be  paid  hereunder  shall  be
forfeited.

(h)

No  Other  Payments  or  Benefits  Owing.  Except  as  expressly  set  forth  herein,  the  payments  and
benefits  set  forth  in  this  Section  4:    (a)  shall  be  the  sole  amounts  owing  to  Executive  upon  termination  of  Executive’s
employment  for  the  reasons  set  forth  above,  and  Executive  shall  not  be  eligible  for  any  other  payments  or  other  forms  of
compensation or benefits; (b) shall be the sole remedy, if any, available to Executive in the event that Executive brings any claim
against Company relating to the termination of Executive’s employment under this Agreement; and (c) shall not be subject to set-
off by Company or any obligation on the part of Executive to mitigate or to offset compensation earned by Executive in other
pursuits  after  termination  of  employment,  other  than  as  specified  herein  with  respect  to  medical  benefits  provided  by  another
employer.

5.

Prohibited Competition and Solicitation. Executive expressly acknowledges that: (a) there are competitive
and proprietary aspects of the business of Company; (b) during the course of Executive’s employment, Company shall furnish,
disclose  or  make  available  to  Executive  confidential  and  proprietary  information  and  may  provide  Executive  with  unique  and
specialized training; (c) such Confidential Information and training have been developed and shall

9

 
 
 
be  developed  by  Company  through  the  expenditure  of  substantial  time,  effort  and  money,  and  could  be  used  by  Executive  to
compete with Company; and (d) in the course of Executive’s employment, Executive shall be introduced to customers and others
with important relationships to Company, and any and all “goodwill” created through such introductions belongs exclusively to
Company, including, but not limited to, any goodwill created as a result of direct or indirect contacts or relationships between
Executive  and  any  customers  of  Company.    In  light  of  the  foregoing  acknowledgements,  and  as  a  condition  of  employment
hereunder, Executive hereby approves the Restrictive Covenant Agreement entered into on the date hereof as a binding obligation
of the Executive, enforceable in accordance with its terms.  

6.

Property and Records. Upon the termination of Executive’s employment hereunder for any reason or for no
reason, or if Company otherwise requests, Executive shall: (a) return to Company all tangible business information and copies
thereof  (regardless  how  such  Confidential  Information  or  copies  are  maintained),  and  (b)  deliver  to  Company  any  property  of
Company which may be in Executive’s possession, including, but not limited to, Blackberry-type devices, smart phones, laptops,
cell phones (the foregoing, “electronic devices”), products, materials, memoranda, notes, records, reports or other documents or
photocopies  of  the  same.    Executive  may  retain  copies  of  any  exclusively  personal  data  contained  in  or  on  Company-owned
electronic  devices  returned  to  Company  pursuant  to  the  foregoing.  The  foregoing  notwithstanding,  Executive  understands  and
agrees that Company property belongs exclusively to Company, it should be used for Company business, and Executive has no
reasonable expectation of privacy on any Company property or with respect to any information stored thereon.

7.

Cooperation.  During and after Executive’s employment, Executive shall fully cooperate with Company to
the extent reasonable in the defense or prosecution of any claims or actions now in existence or which may be brought in the
future  against  or  on  behalf  of  Company  (other  than  claims  directly  or  indirectly  against  Executive)  which  relate  to  events  or
occurrences that transpired while Executive was employed by Company. Executive’s cooperation in connection with such claims
or actions shall include, but not be limited to, being available to meet with counsel to prepare for discovery or trial and to act as a
witness on behalf of Company at mutually convenient times. During and after Executive’s employment, Executive also shall fully
cooperate  with  Company  to  the  extent  reasonable  in  connection  with  any  investigation  or  review  of  any  federal,  state  or  local
regulatory  authority  as  any  such  investigation  or  review  relates  to  events  or  occurrences  that  transpired  while  Executive  was
employed by Company. Company shall reimburse Executive for any reasonable out-of-pocket expenses incurred in connection
with the Executive’s performance of obligations pursuant to this section. In addition, Company shall compensate Executive on an
hourly basis, based on a rate commensurate with Executive’s Base Salary in effect prior to termination, for time Executive spends
in excess of 10 hours in any calendar quarter providing services to the Corporation after termination.

8.

Code Sections 409A and 280G.  

qualified deferred compensation” subject to Section 409A, then the following conditions apply to such payments or benefits:

(a)

In the event that the payments or benefits set forth in Section 4 of this Agreement constitute “non-

10

 
 
 
(i)

Any termination of Executive’s employment triggering payment of benefits under Section
4  must  constitute  a  “separation  from  service”  under  Section  409A(a)(2)(A)(i)  of  the  Code  and  Treas.  Reg.
§1.409A-1(h)  before  distribution  of  such  benefits  can  commence.    To  the  extent  that  the  termination  of
Executive’s  employment  does  not  constitute  a  separation  of  service  under  Section  409A(a)(2)(A)(i)  of  the
Code  and  Treas.  Reg.  §1.409A-1(h)  (as  the  result  of  further  services  that  are  reasonably  anticipated  to  be
provided  by  Executive  to  Company  at  the  time  Executive’s  employment  terminates),  any  such  payments
under  Section  4  that  constitute  deferred  compensation  under  Section  409A  shall  be  delayed  until  after  the
date of a subsequent event constituting a separation of service under Section 409A(a)(2)(A)(i) of the Code
and Treas. Reg. §1.409A-1(h).  For purposes of clarification, this Section 8(a) shall not cause any forfeiture
of benefits on Executive’s part, but shall only act as a delay until such time as a “separation from service”
occurs.  

(ii)

Notwithstanding any other provision with respect to the timing of payments under Section
4 if, at the time of Executive’s termination, Executive is deemed to be a “specified employee” of Company
(within  the  meaning  of  Section  409A(a)(2)(B)(i)  of  the  Code),  then  limited  only  to  the  extent  necessary  to
comply with the requirements of Section 409A, any payments to which Executive may become entitled under
Section  4  which  are  subject  to  Section  409A  (and  not  otherwise  exempt  from  its  application)  shall  be
withheld until the first (1st) business day of the seventh (7th) month following the termination of Executive’s
employment,  at  which  time  Executive  shall  be  paid  an  aggregate  amount  equal  to  the  accumulated,  but
unpaid, payments otherwise due to Executive under the terms of Section 4.

(b)

It is intended that each installment of the payments and benefits provided under Section 4 of this
Agreement shall be treated as a separate “payment” for purposes of Section 409A.  Neither Company nor Executive shall have
the  right  to  accelerate  or  defer  the  delivery  of  any  such  payments  or  benefits  except  to  the  extent  specifically  permitted  or
required by Section 409A.

(c)

Notwithstanding  any  other  provision  of  this  Agreement  to  the  contrary,  this   Agreement  shall  be
interpreted and at all times administered in a manner that avoids the inclusion of compensation in income under Section 409A, or
the payment of increased taxes, excise taxes or other penalties under Section 409A. The parties intend this Agreement to be in
compliance with Section 409A.  Executive acknowledges and agrees that Company does not guarantee the tax treatment or tax
consequences associated with any payment or benefit arising under this Agreement, including but not limited to consequences
related to Section 409A.

(d)

If any payment or benefit Executive would receive under this Agreement, when combined with any
other payment or benefit Executive receives pursuant to a Change of Control (for purposes of this section, a “Payment”) would:
(i) constitute a “parachute payment” within the meaning of Section 280G the Code; and (ii) but for this sentence, be subject to the
excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then such Payment shall be either: (A) the full amount of
such Payment; or (B) such lesser amount (with cash payments being

11

 
 
 
reduced  before  stock  option  compensation)  as  would  result  in  no  portion  of  the  Payment  being  subject  to  the  Excise  Tax,
whichever of the foregoing amounts, taking into account the applicable federal, state and local employments taxes, income taxes,
and the Excise Tax, results in Executive’s receipt, on an after-tax basis, of the greater amount of the Payment notwithstanding that
all or some portion of the Payment may be subject to the Excise Tax.  Notwithstanding the foregoing, if, prior to the closing of an
initial public offering, any Payment can be exempt from the definition of “parachute payment” and the Excise Tax pursuant to the
shareholder approval requirements described in Treas. Regs. § 1.280G-1, Q&A 6, the Company will, at the Executive’s election
(and  subject  to  the  Executive  signing  an  appropriate  waiver)  seek  shareholder  approval  to  exempt  such  Payment  from  the
definition of “parachute payment” and the Excise Tax.

9.

General.

(a)

Notices.  Except as otherwise specifically provided herein, any notice required or permitted by this
Agreement shall be in writing and shall be delivered as follows with notice deemed given as indicated: (i) by personal delivery
when  delivered  personally;  (ii)  by  overnight  courier  upon  written  verification  of  receipt;  (iii)  by  telecopy  or  facsimile
transmission  upon  acknowledgment  of  receipt  of  electronic  transmission;  or  (iv)  by  certified  or  registered  mail,  return  receipt
requested, upon verification of receipt.

Notices to Executive shall be sent to the last known address in Company’s records or such other address as Executive
may specify in writing.

Notices to Company shall be sent to:  

Spero Therapeutics, Inc.
675 Massachusetts Ave., 14th Floor
Cambridge, MA 02139
Attn: CEO

amended only by written agreement executed by the parties hereto.

(b)

Modifications and Amendments.  The terms and provisions of this Agreement may be modified or

(c)

Waivers and Consents.  The terms and provisions of this Agreement may be waived, or consent for
the  departure  therefrom  granted,  only  by  a  written  document  executed  by  the  party  entitled  to  the  benefits  of  such  terms  or
provisions.  No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other
terms or provisions of this Agreement, whether or not similar.  Each such waiver or consent shall be effective only in the specific
instance and for the purpose for which it was given and shall not constitute a continuing waiver or consent.

(d)

Assignment.  Company may assign its rights and obligations hereunder to any person or entity that
succeeds to all or substantially all of Company’s business or that aspect of Company’s business in which Executive is principally
involved.  Executive may not assign Executive’s rights and obligations under this Agreement without the prior written consent of
Company.

12

 
 
 
 
(e)

Governing Law/Dispute Resolution.  This Agreement and the rights and obligations of the parties
hereunder shall be construed in accordance with and governed by the law of the Commonwealth of Massachusetts without giving
effect to the conflict of law principles thereof.  Any legal action or proceeding with respect to this Agreement shall be brought in
the  courts  of  the  Commonwealth  of  Massachusetts  or  of  the  United  States  of  America  for  the  District  of  Massachusetts.  By
execution and delivery of this Agreement, each of the parties hereto accepts for itself and in respect of its property, generally and
unconditionally, the non-exclusive jurisdiction of the aforesaid courts.

Jury  Waiver.   ANY,  ACTION,  DEMAND,  CLAIM,  OR  COUNTERCLAIM  ARISING  UNDER
OR RELATING TO THIS AGREEMENT SHALL BE RESOLVED BY A JUDGE ALONE, AND EACH OF COMPANY AND
EXECUTIVE WAIVES ANY RIGHT TO A JURY TRIAL THEREOF.

(f)

Headings and Captions.  The headings and captions of the various subdivisions of this Agreement
are for convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or
provisions hereof.

(g)

(h)

Entire  Agreement.  This  Agreement,  together  with  the  other  agreements  specifically  referenced
herein, embodies the entire agreement and understanding between the parties hereto with respect to the subject matter hereof and
supersedes  all  prior  oral  or  written  agreements  and  understandings  relating  to  the  subject  matter  hereof.  No  statement,
representation, warranty, covenant or agreement of any kind not expressly set forth in this Agreement shall affect, or be used to
interpret, change or restrict, the express terms and provisions of this Agreement.

Counterparts.    This  Agreement  may  be  executed  in  two  or  more  counterparts,  and  by  different
parties hereto on separate counterparts, each of which shall be deemed an original, but all of which together shall constitute one
and the same instrument.  For all purposes a signature by fax shall be treated as an original.

(i)

[Signature Page to Follow]

13

 
 
 
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first written above.

TAMARA JOSEPH

/s/ Tamara Joseph
Signature

SPERO THERAPEUTICS, INC.

By: /s/ Ankit Mahadevia

Name: Ankit Mahadevia
Title:

CEO

14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 10.25

AMENDED AND RESTATED LICENSE AGREEMENT

This AMENDED AND RESTATED LICENSE AGREEMENT (this “Agreement”) , effective as of January 15, 2021
(the  “Amendment  Effective  Date”),  is  entered  into  by  and  among  Everest  Medicines  II  Limited,  a  company  incorporated
under  the  laws  of  the  Cayman  Islands  (“Everest”)  having  its  registered  office  at  Vistra  (Cayman)  Limited,  P.  O.  Box  31119,
Grand Pavilion, Hibiscus Way, 802 West Bay Road, Grand Cayman, KY1 – 1205, Cayman Islands; Spero Therapeutics, Inc., a
Delaware  corporation  (“Spero”)  having  its  principal  place  of  business  at  675  Massachusetts  Avenue,  14th  Floor,  Cambridge,
Massachusetts, 02139; and, solely for purposes of Section 3.3(e) (with respect to the SPR741 Option), Spero Potentiator, Inc., a
Delaware  corporation  (“Potentiator”)  having  its  principal  place  of  business  at  675  Massachusetts  Avenue,  14th  Floor,
Cambridge, Massachusetts, 02139. Everest, Spero and Potentiator are referred to individually as a “Party” and collectively as the
“Parties.”

RECITALS

WHEREAS,  New  Pharma  License  Holdings  Limited  (“NPLH”,  a  company  organized  under  the  laws  of  Malta
having  registration  number  C  75891  and  its  principal  place  of  business  at  675  Massachusetts  Avenue,  14th  Floor,  Cambridge,
Massachusetts, 02139) was the previous owner of certain intellectual property relating to a compound known as SPR206 being
investigated as an antibiotic against multi-drug resistant and extensively drug resistant bacterial strains;

WHEREAS,  Potentiator  owns  certain  intellectual  property  relating  to  a  compound  known  as  SPR741  being

investigated as a potentiator of antibiotic activity;

WHEREAS, each of NPLH and Potentiator are direct or indirect wholly-owned subsidiaries of Spero;

WHEREAS, NPLH, Everest and Potentiator entered into a license agreement (the “Original License”) dated January
1, 2019 (the “Effective Date”), under which (i) NPLH granted a license to Everest under certain intellectual property rights of
NPLH at that time to develop and commercialize SPR206 in certain territories; and (ii) Potentiator granted an exclusive option to
Everest  to  negotiate  for  an  exclusive  license  to  use  certain  intellectual  property  rights  of  Potentiator  to  develop  and
commercialize SPR741 in certain territories (the “SPR741 Option”);

WHEREAS, pursuant to the notice and consent to assignment of licensed technology issued to Everest by NPLH and
Spero  dated  June  18,  2020,  NPLH  assigned  to  Spero  all  of  the  business  and  assets  of  NPLH  related  to  the  Original  License,
including  without  limitation,  the  Licensed  Technology  (as  defined  under  the  Original  License),  and  Spero  agreed  to  be
responsible to Everest for the performance of all the obligations of NPLH under the Original License;

WHEREAS,  Spero  has  now  agreed  to  assign  to  Everest,  and  Everest  has  agreed  to  accept,  all  the  Licensed  Patents

under the Original License (referred to as “Assigned Patents” under this

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

1

 
 
 
 
Agreement,  as  more  particularly  defined  under  ARTICLE  1);  provided  that,  upon  the  occurrence  of  certain  specified  events,
Spero shall have an exclusive option to acquire back the Assigned Patents, in accordance with the terms of this Agreement;

WHEREAS, Everest has now determined not to exercise the SPR741 Option under the Original License, and Everest
and Potentiator have agreed that all the provisions of the Original License associated with the SPR741 Option shall cease to have
effect; and

WHEREAS,  Spero  and  Everest  now  desire  to  amend  and  restate  in  its  entirety  the  Original  License  to  reflect  the
abovementioned  consensus,  together  with  other  agreed  commercial  terms,  such  amendment  effective  as  of  the  Amendment
Effective Date.

NOW,  THEREFORE,  in  consideration  of  the  foregoing  premises  and  the  mutual  covenants  herein  contained,  the

receipt and sufficiency which are hereby acknowledged, the Parties hereby agree as follows.

ARTICLE 1
DEFINITIONS

Unless  the  context  otherwise  requires,  the  terms  in  this  Agreement  with  initial  letters  capitalized,  shall  have  the

meanings set forth below, or the meaning as designated in the indicated places throughout this Agreement.

1.1

“Active  Pharmaceutical  Ingredient”  or  “API”  means  any  substance  intended  to  be  used  in  a
pharmaceutical  product  that  when  used  becomes  an  active  ingredient  of  that  product  intended  to  exert  a  pharmacological,
immunological or metabolic action with a view to restoring, correcting or modifying physiological functions in man or animal;
but  excluding  formulation  components  such  as  coatings,  stabilizers,  excipients  or  solvents,  adjuvants  or  controlled  release
technologies.

1.2

“Affiliate”  means,  with  respect  to  a  Party,  any  Person  that,  directly  or  indirectly  through  one  or  more
intermediaries,  controls,  is  controlled  by,  or  is  under  common  control  with  that  Party,  but  for  only  so  long  as  such  control
exists.  For the purpose of this definition, “control” (including, with correlative meaning, the terms “controlled by” and “under
common  control”)  means  (a)  to  possess,  directly  or  indirectly,  the  power  to  direct  the  management  or  policies  of  an  entity,
whether through ownership of voting securities, by contract relating to voting rights or corporate governance, or otherwise; or
(b)  direct  or  indirect  beneficial  ownership  of  more  than  fifty  percent  (50%),  or  such  lesser  percentage  which  is  the  maximum
allowed to be owned by a foreign corporation in a particular jurisdiction, of the voting share capital or other equity interest in
such entity.

1.3

“Applicable Laws” means the applicable provisions of any and all national, supranational, regional, federal,
state  and  local  laws,  treaties,  statutes,  rules,  regulations,  administrative  codes,  guidance,  ordinances,  judgments,  decrees,
directives, injunctions, orders, permits (including MAAs) of or from any court, arbitrator, Regulatory Authority or Government

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

2

 
 
 
Authority  having  jurisdiction  over  or  related  to  the  subject  item,  including  the  FFDCA,  DAL,  and  the  Provisions  for  Drug
Registration of NMPA.

1.4

“Assigned Patents” means all Patents Controlled by Spero in the Territory as of the Amendment Effective
Date or during the Term that are necessary or reasonably useful for the Development, Manufacture, Commercialization, or other
Exploitation of the Compound or any Licensed Product for use in the Licensed Field in the Territory, including any Spero Sole
Invention Patents in the Territory. For clarity, “Assigned Patents” includes all provisionals, divisionals, reissues, reexaminations,
renewals, continuations, continuations-in-part, substitute applications, priority applications and inventors’ certificates, extensions
and  supplemental  certificates  and  any  and  all  foreign  equivalents  of  the  foregoing  Controlled  by  Spero  (including,  for  the
avoidance  of  doubt,  the  national  applications  for  [***]  filed  in  any  jurisdiction  in  the  Territory  upon  Everest’s  request).  The
Assigned Patents existing as of the Amendment Effective Date are listed on Exhibit A.

1.5

1.6

1.7

“Assignment” has the meaning set forth in Section 2.1 (Assignment).  

“Auditor” has the meaning set forth in Section 9.10 (Audit Dispute).

“Business Day” means a day other than a Saturday, Sunday or a bank or other public holiday in Mainland

China, Hong Kong or The Commonwealth of Massachusetts in United States.

1.8

“Calendar Quarter” means each respective period of three (3) consecutive months ending on 31 March, 30
June, 30 September, and 31 December, except that the first Calendar Quarter of the Term shall commence on the Effective Date
and end on the day immediately prior to the first 1 January, 1 April, 1 July or 1 October to occur after the Effective Date, and the
last Calendar Quarter shall end on the last day of the Term.

1.9

“Calendar  Year”  means  each  successive  period  of  12  calendar  months  commencing  on  1  January  and
ending  on  31  December  except  that  the  first  Calendar  Year  of  the  Term  shall  commence  on  the  Effective  Date  and  end  on  31
December of the year in which the Effective Date occurs and the last Calendar Year of the Term shall commence on 1 January of
the year in which the Term ends and end on the last day of the Term.

1.10

“CFR” means the U.S. Code of Federal Regulations.

1.11

“Challenge”  means  to  contest  or  assist,  directly  or  indirectly,  in  the  contesting  of  the  validity  or
enforceability of any of the Assigned Patents, in whole or in part, in any court, arbitration proceeding or other tribunal, including
the  United  States  Patent  and  Trademark  Office  and  the  United  States  International  Trade  Commission.    For  the  avoidance  of
doubt,  the  term  “contest”  includes:    (a)  filing  an  action  under  28  U.S.C.  §§  2201-2202  seeking  a  declaration  of  invalidity  or
unenforceability of any Assigned Patents; (b) citation to the United States Patent and Trademark Office pursuant to 35 U.S.C. §
301 of prior art patents or printed publications or statements of the patent owner concerning the scope of any of the Assigned
Patents; (c) filing a request under 35 U.S.C. § 302 for re-examination of any of the Assigned Patents; (d) filing, or

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

3

 
 
 
joining in, a petition under 35 U.S.C. § 311 to institute inter partes review of any Assigned Patents  or  any portion thereof;  (e)
filing, or joining in, a petition under 35 U.S.C. § 321 to institute post-grant review of the Assigned Patents or any portion thereof;
(f) provoking or becoming a party to an interference with an application for any of the Assigned Patents pursuant to 35 U.S.C. §
135;  (g)  filing  or  commencing  any  re-examination,  opposition,  cancellation,  nullity  or  similar  proceedings  against  any  of  the
Assigned Patents in any country; or (h) any foreign equivalents of subsection (a) through (g) applicable in the Territory.

1.12

“Claims” means all Third Party demands, claims, actions, proceedings and liabilities (whether criminal or

civil, in contract, tort or otherwise) for losses, damages, legal costs and other expenses of any nature.

1.13

“Clinical Study Report” means an “integrated” full report of an individual study of SPR206 that includes
statistical descriptions, presentations and analyses, incorporating tables and figures into the main text of the report or at the end of
the text, with appendices containing such information as the protocol, sample case report forms, investigator-related information,
information  related  to  the  test  drugs/investigational  products  including  active  control/comparators,  technical  statistical
documentation,  related  publications,  patient  data  listings,  and  technical  statistical  details  such  as  derivations,  computations,
analyses,  and  computer  output,  prepared  under  the  guidelines  of  the  International  Conference  on  Harmonisation  of  Technical
Requirements for Registration of Pharmaceuticals for Human Use.

1.14

“CMC” means chemistry, manufacturing, and controls.

1.15

“Combination  Product”  means  any  Licensed  Product  comprised  of  the  following,  either  formulated
together (i.e., a fixed dose combination), packaged together and sold for a single price, or co-administered or jointly provided to
patients (but which shall be limited to anti-infectious product only), whether or not packaged together: (a) the Compound, and (b)
at least one other Active Pharmaceutical Ingredient.

1.16

“Commercial  Supply  Agreement”  has  the  meaning  set  forth  in  Section  7.1(b)  (Commercial  Supply

Agreement).

1.17

“Commercialization” means the conduct of all activities undertaken before and after Regulatory Approval
has  been  obtained  relating  to  the  promotion,  marketing,  sale  and  distribution  (including  importing,  exporting,  transporting  for
commercial sales, customs clearance, warehousing, invoicing, handling and delivering the Licensed Products to customers) of the
Compound  or  the  Licensed  Products,  including:  (a)  sales  force  efforts,  detailing,  advertising,  medical  education,  planning,
marketing, sales force training, and sales and distribution; and (b) scientific and medical affairs.  For clarity, Commercialization
does  not  include  any  Development  activities,  whether  conducted  before  or  after  Regulatory  Approval.    “Commercialize”  and
“Commercializing” have correlative meanings.

1.18

“Commercialization Plan” has the meaning set forth in Section 8.2 (Commercialization Plan).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

4

 
 
 
1.19

“Commercially Reasonable Efforts” means, with respect to each Party’s obligations under this Agreement
relating  to  the  Development,  Manufacturing,  and  Commercialization  activities  with  respect  to  the  Compound  or  the  Licensed
Products,  the  carrying  out  of  such  activities  using  efforts  and  resources  that  are  consistent  with  the  exercise  of  customary
scientific and business practices as applied in the pharmaceutical industry for a company of a similar stage and size as the entity
and  having  similar  resources,  for  development,  regulatory,  manufacturing  and  commercialization  activities  conducted  with
respect to products at a similar stage of development or commercialization and having similar commercial potential, taking into
account  relative  safety  and  efficacy,  product  profile,  the  regulatory  environment,  payers’  policies  and  regulations,
competitiveness  of  the  marketplace  and  the  market  potential  of  such  products,  the  nature  and  extent  of  market  exclusivity,
including patent coverage and regulatory data protection, and price and reimbursement status.  The Parties hereby agree that the
level  of  effort  may  be  different  for  different  markets  and  may  change  over  time,  reflecting  changes  in  the  status  of  the
aforementioned attributes and potential of the Compound and the Licensed Products.  When used regarding obligations under this
Agreement other than the Development, Manufacturing, and Commercialization activities with respect to the Compound or the
Licensed  Products,  the  term  “Commercially  Reasonable  Efforts”  shall  mean  the  carrying  out  of  such  activities  using
commercially reasonable efforts and financial, personnel and other resources that are consistent with the exercise of customary
business practices as applied in the carrying out of such activities generally by and on behalf of biopharmaceutical companies of
a similar stage and size and having similar resources.

1.20

“Completion”  means  the  completion  of  the  manufacturing  technology  transfer  from  Spero  to  Everest
contemplated under Section 7.2, including, without limitation, (i) the transfer or having made available to Everest by or on behalf
of  Spero  of  all  the  Licensed  Manufacturing  Know-How  possessed  and  Controlled  by  Spero;  and  (ii)  the  completion  of  all
necessary introductions and required permissions relating to existing Spero CMOs.

1.21

“Compound” means SPR206.

1.22

“Confidential Information” of a Party means all Know-How, Inventions, unpublished patent applications
and other information and data of a financial, commercial, business, operational or technical nature of such Party that is disclosed
or made available by or on behalf of such Party or any of its Affiliates to the other Party or any of its Affiliates, whether made
available orally, in writing or in electronic or other form.  The terms of this Agreement are the Confidential Information of both
Parties.

1.23

“Control” or “Controlled” means, with respect to any Know-How, Patents, Regulatory Documentation or
other intellectual property rights, that a Party has the legal authority or right (whether by ownership, license or otherwise, other
than by virtue of any license granted to such Party by the other Party pursuant to this Agreement) to grant a license, sublicense,
access  or  other  right  (as  applicable)  under  such  Know-How,  Patents,  Regulatory  Documentation  or  other  intellectual  property
rights to the other Party on the terms and conditions set forth herein, in each case without breaching the terms of any agreement
with a Third Party, infringing third party intellectual property, or misappropriating third party trade secrets.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

5

 
 
 
1.24

“Controlling Party” has the meaning set forth in Section 10.6 (Invalidity or Unenforceability Defenses or

Actions)

1.25

“Corporate Names” has the meaning set forth in Section 1.124 (Spero Trademarks).

1.26

“Cost of Goods” means, with respect to any Compound or any Licensed Product, the fully absorbed cost to
manufacture  such  Compound  or  Licensed  Product  in  finished  form  for  Development  and/or  Commercialization  use,  which
means:  (a)  in  the  case  of  products,  intermediates,  API  and  services  acquired  from  one  or  more  Third  Parties,  all  documented
payments made to such Third Parties or direct material costs directly related to such products, intermediates, API and services,
including without limitation, all costs incurred in purchasing materials, sales, excise and other taxes imposed thereon, customs
duties, import, export and other charges levied by Governmental Authorities, all costs of packaging, shipping and insuring such
materials; and (b) in the case of manufacturing services performed by a Party or its Affiliates, including manufacturing services
that are reasonably necessary to support products and services acquired from Third Parties as contemplated in subsection (a), the
actual  unit  costs  of  manufacture,  with  no  markup  of  any  nature.  The  remainder  of  this  definition  is  only  applicable  for
determining costs of manufacturing services performed by a Party or its Affiliates as contemplated by subsection (b). Actual unit
costs shall consist of direct material costs, direct labor costs, and manufacturing overhead directly attributable to such Compound
or Licensed Product, all calculated in accordance with GAAP, but without allocation of idle capacity, all to the extent provided,
procured  or  incurred  in  connection  with  the  manufacture  of  such  Compound  or  Licensed  Product.  Direct  material  costs  shall
include  the  costs  incurred  in  purchasing  materials,  including  sales,  excise  and  other  taxes  imposed  thereon,  customs  duties,
import,  export  and  other  charges  levied  by  Governmental  Authorities,  and  all  costs  of  packaging,  shipping  and  insuring  such
components. Direct labor costs shall include the cost of: (i) employees working in direct manufacturing and packaging of such
Compound  or  Licensed  Product;  and  (ii)  direct  quality  control  and  quality  assurance  activities.  Manufacturing  overhead
attributable to such Compound or Licensed Product shall include a reasonable allocation of indirect labor costs (not previously
included in direct labor costs). Manufacturing overhead shall in no event exceed [***]% of the sum of the direct material costs
and  direct  labor  costs.    Cost  of  Goods  under  the  preceding  subsection  (b)  specifically  excludes  profit  margins  of  Spero  or  its
Affiliates.

1.27

“CTA” means a Clinical Trial Application that is required to initiate a clinical trial for registering a drug
product  under  the  Drug  Administration  Law  of  the  People’s  Republic  of  China  and  the  Provisions  for  Drug  Registration  of
NMPA, and equivalents thereof under future Chinese laws and regulations, and the laws and regulations of other countries and
jurisdictions in the Territory, in each as the same may be amended from time to time.

1.28

“DAL” means the Drug Administration Law of the People’s Republic of China and the equivalent laws of

other countries and jurisdictions in the Territory, in each as the same may be amended from time to time.

1.29

“Develop” or “Development” means to develop (including clinical, non-clinical and CMC development),

analyze, test and conduct preclinical, clinical and all other regulatory

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

6

 
 
 
trials for the Compound or Licensed Product, including all post-approval clinical trials, as well as all related regulatory activities
and any and all activities pertaining to new Indications, pharmacokinetic studies and all related activities including work on new
formulations,  new  methods  of  treatment  and  CMC  activities  including  new  manufacturing  methods.    “Developing”  and
“Development” have correlative meanings.

1.30

1.31

1.32

1.33

1.34

1.35

1.36

1.37

1.38

“Development Plan” has the meaning set forth in Section 5.2 (Development Plan).

“Diligence Meeting” has the meaning set forth in Section 5.3(b) (Specific Diligence Events).

“Diligence Meeting Date” has the meaning set forth in Section 5.3(b) (Specific Diligence Events).

“Diligence Milestone” has the meaning set forth in Section 5.3(b) (Specific Diligence Events).

“Diligence Target Dates” has the meaning set forth in Section 5.3(b) (Specific Diligence Events).

“Disclosing Party” has the meaning set forth in Section 11.1(a) (Duty of Confidence - subsection (a)).

“Dispute” has the meaning set forth in Section 15.10(a) (Dispute Resolution - subsection (a)).

“Dollar” means U.S. dollars, and “$” shall be interpreted accordingly.

“[***] Study” means a clinical study to measure [***].

1.39

“Everest  Development  Data”  means  any  (a)  pharmacology,  toxicology  and  other  biological  data
Controlled  by  Everest  related  to  the  Compound  or  any  Licensed  Product  or  otherwise  included  in,  or  filed  in  support  of,  the
Regulatory Documentation filed by Everest in the Territory and (b) clinical data Controlled by Everest related to the Compound
or any Licensed Product or otherwise included in, or filed in support of, the Regulatory Documentation filed by Everest in the
Territory.

1.40

“Everest Know-How” means all Know-How that Everest Controls as of the Amendment Effective Date or
during  the  Term  that  is  necessary  or  reasonably  useful  for  the  Development,  Manufacture,  Commercialization  or  other
Exploitation of any Compound or Licensed Product in the Licensed Field, including Everest Sole Inventions, Everest’s interest in
any Joint Inventions, Everest Development Data and Everest’s Regulatory Documentation.

1.41

“Everest Indemnitees” has the meaning set forth in Section 14.1 (Indemnification by Spero).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

7

 
 
 
1.42

“Everest Patents” means all Patents that Everest Controls as of the Amendment Effective Date or during
the Term that are necessary or reasonably useful for the Development, Manufacture, Commercialization or other Exploitation of
any  Compound  or  any  Licensed  Product  in  the  Licensed  Field,  including  the  Assigned  Patents,  any  Everest  Sole  Invention
Patents, any Joint Patents in the Territory, and Everest’s interest in any Joint Patents outside the Territory.

1.43

“Everest  Sole  Inventions”  means  any  Inventions  that  are  conceived  and  reduced  to  practice  solely  by
employees of, or consultants or service providers to, Everest, at any time during the Term of this Agreement and that are made,
generated, conceived or otherwise invented as a result of a Party exercising its rights or carrying out its obligations under this
Agreement, whether directly or via its Affiliates, agents or independent contractors.

1.44

“Everest Sole Invention Patents” means any Patents that contain one or more claims that cover Everest

Sole Inventions.

1.45

1.46

1.47

“Everest Technology” means the Everest Patents and the Everest Know-How.

“Excluded Claim” has the meaning set forth in Section 15.10(g) (Dispute Resolution - subsection (g)).

“Executive Officers” has the meaning set forth in Section 4.3(b) (JDC Decision Making - subsection (a)).

1.48

“Exploit”  means  to  make,  have  made,  import,  use,  sell  or  offer  for  sale,  including  to  research,  Develop,
Commercialize, register, Manufacture, have Manufactured, hold or keep (whether for disposal or otherwise), have used, export,
transport, distribute, promote, market or have sold or otherwise dispose of.  

1.49

1.50

“Exploitation” means the act of Exploiting the Compound, product or process.

“FDA” means the United States Food and Drug Administration or any successor entity thereto.

1.51

“FFDCA” means the United States Federal Food, Drug, and Cosmetic Act, as amended from time to time,
together with any rules, regulations and requirements promulgated thereunder (including all additions, supplements, extensions
and modifications thereto).

1.52

“First Commercial Sale” means, with respect to any Licensed Product in any jurisdiction in the Territory,
the first arm’s length sale of such Licensed Product by Everest, its Affiliates or Sublicensees to a Third Party for monetary value
for  use  or  consumption  of  such  Licensed  Product  by  the  end  user  in  the  general  public  after  Regulatory  Approval  for  such
Licensed Product in such jurisdiction has been granted.  Sales prior to receipt of Regulatory Approval for such Licensed Product,
such as so-called “treatment IND sales,” “named patient sales,” and “compassionate use sales,” shall not be construed as a First
Commercial Sale.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

8

 
 
 
1.53

1.54

Year.

“First Diligence Notice” has the meaning set forth in Section 5.3(b) (Specific Diligence Events).

“Fiscal Year” means the period from January 1 of a Calendar Year through December 31 of such Calendar

1.55

“GAAP”  means  the  then-current  Generally  Accepted  Accounting  Principles  or  International  Financial
Reporting Standards (IFRS), whichever is adopted as the standard financial accounting guideline in the United States for public
companies, as consistently applied.

1.56

“Generic  Competition”  means,  on  a  Licensed  Product-by-Licensed  Product  and  jurisdiction-by-
jurisdiction basis, that, in a given Calendar Quarter, one or more Third Parties is selling one or more Generic Products in such
jurisdiction  and  the  unit  volume  of  all  Generic  Products  to  such  Licensed  Product  sold  in  such  jurisdiction  in  such  Calendar
Quarter  is  equal  to  or  greater  than  [***]  percent  ([***]%)  of  the  combined  unit  volume  of  such  Generic  Products  and  such
Licensed Product sold in such jurisdiction in such Calendar Quarter, where the number of units of the Generic Products and the
Licensed Product sold in the relevant jurisdiction and Calendar Quarter are as reported by IQVIA or any successor thereto (or
based on equivalent data reported by any other independent sales auditing firm mutually agreed by the Parties if IQVIA data are
not available).

1.57

“Generic  Product”  means,  with  respect  to  a  Licensed  Product,  any  product  that  contains  the  same
Compound  as  such  Licensed  Product  and  that  is  sold  under  an  approved  Marketing  Authorization  Application  granted  by  a
Regulatory Authority to a Third Party that is not a Sublicensee of Everest or its Affiliates and did not obtain such product in a
chain of distribution that includes any of Everest, its Affiliates, or its Sublicensees.

1.58

“Good  Manufacturing  Practices”  or  “GMP”  shall  mean  all  applicable  Good  Manufacturing  Practices

standards, including, as applicable, those standards required by any Regulatory Authority in the Territory.

1.59

“Government  Authority”  means  any  federal,  state,  national,  state,  provincial  or  local  government,  or
political subdivision thereof, or any multinational organization or any authority, agency or commission entitled to exercise any
administrative,  executive,  judicial,  legislative,  police,  regulatory  or  taxing  authority  or  power,  any  court  or  tribunal  (or  any
department, bureau or division thereof, or any governmental arbitrator or arbitral body).

1.60

“Hong Kong” means the Hong Kong Special Administrative Region of the People’s Republic of China.

1.61

“IND”  means  a  CTA  or  any  other  investigational  new  drug  application,  clinical  trial  application,  clinical
trial exemption or similar or equivalent application or submission for approval to conduct human clinical investigation filed with
or  submitted  to  the  NMPA  in  conformance  with  the  requirements  of  the  NMPA,  or  any  other  Regulatory  Authority  of  any
jurisdiction in the Territory in conformance with the requirements of such Regulatory Authority.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

9

 
 
 
1.62

1.63

1.64

1.65

“Indemnification Claim Notice” has the meaning set forth in Section 14.3(a) (Notice of Claim).

“Indemnified Party” has the meaning set forth in Section 14.3(a) (Notice of Claim).

“Indemnifying Party” has the meaning set forth in Section 14.3(a) (Notice of Claim).

“Indication”  means  a  separate  and  distinct  disease,  disorder,  illness  or  health  condition  for  which  a

separate MAA approval is required.

1.66

“Indirect Costs” means, with respect to a multi-regional clinical trial, all Third Party costs and expenses
incurred by Spero or Everest to conduct such multi-regional clinical trial that are not directly allocable to a Party’s territory (or to
clinical  sites  within  a  Party’s  territory),  including,  without  limitation,  fees,  costs  and  expenses  for  data  management,  clinical
evaluation committees, data safety monitoring boards, physician consulting, investigator meetings, travel, document translation
and other technology solutions and services that are not specific to a territory or a clinical site within a territory.

1.67

“Infringed  IP”  means,  with  respect  to  any  jurisdiction  in  the  Territory,  (a)  a  claim  of  an  issued  and
unexpired Patent (as may be extended through supplementary protection certificate or patent term extension or the like) that has
not  been  cancelled,  revoked,  held  invalid  or  unenforceable  by  a  decision  of  a  patent  office  or  other  Government  Authority  of
competent jurisdiction from which no appeal can be taken (or from which no appeal was taken within the allowable time period)
and which claim has not been disclaimed, denied or admitted to be invalid or unenforceable through reissue, re-examination or
disclaimer or otherwise; (b) a claim of a Patent application pending for no more than [***] years that has not been cancelled,
withdrawn or abandoned or finally rejected by an administrative agency action from which no appeal can be taken; or (c) any
Know-How not in the public domain; in each of case (a) and (b) which such claim the JDC reasonably determines to be infringed
by  (i)  Everest’s  Manufacturing,  selling  or  offering  for  sale  of  the  Compound  or  a  Licensed  Product  and/or  (ii)  Spero’s
Manufacturing, selling or offering for sale of the Compound or a Licensed Product; and in the case of (c), which Know-How the
JDC  reasonably  determines  to  be  necessary  to  (i)  Everest’s  Manufacturing,  selling  or  offering  for  sale  of  the  Compound  or  a
Licensed Product and/or (ii) Spero’s Manufacturing, selling or offering for sale of the Compound or a Licensed Product.

1.68

1.69

“Initial Development Plan” has the meaning set forth in Section 4.2 (Development Plan).

“Initiation”  means,  with  respect  to  a  clinical  trial,  the  first  dosing  (whether  with  investigational  drug,

comparator drug or placebo) of the first subject in such clinical trial.

1.70

“Initial Supply Agreement” has the meaning set forth in Section 7.1 (Supply Agreement).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

10

 
 
 
1.71

1.72

“Initial Term” has the meaning set forth in Section 12.1 (Term).

“In-License Agreement” has the meaning set forth in Section 3.4(b) (In-License Agreements).

1.73

“Invention”  means  any  technical,  scientific  and  other  know-how  and  information,  trade  secrets,
knowledge, technology, means, methods, processes, practices, formulae, instructions, skills, techniques, procedures, experiences,
ideas, technical assistance, designs, drawings, assembly procedures, computer programs, apparatuses, specifications, data, results
and other material, including: biological, chemical, pharmacological, toxicological, pharmaceutical, physical and analytical, pre-
clinical, clinical, safety, manufacturing and quality control data and information, including study designs and protocols, assays
and biological methodology process, composition of matter, article of manufacture, discovery or finding, patentable or otherwise,
that is made, generated, conceived or otherwise invented as a result of a Party exercising its rights or carrying out its obligations
under  this  Agreement,  whether  directly  or  via  its  Affiliates,  agents  or  independent  contractors,  including  all  rights,  title  and
interest in and to the intellectual property rights therein.  For clarity, “Invention” does not include Spero Development Data or
Everest Development Data.

1.74

“Joint Development Committee” or “JDC” has the meaning set forth in Section 4.1 (Joint Development

Committee).

1.75

“Joint Inventions” means any Inventions that are conceived and reduced to practice jointly by employees
of, or consultants or service providers to, Spero and Everest, at any time during the Term of this Agreement and that are made,
generated,  conceived  or  otherwise  invented  as  a  result  of  Spero  and  Everest  exercising  their  rights  or  carrying  out  their
obligations under this Agreement, whether directly or via their Affiliates, agents or independent contractors.

1.76

“Joint Patents” means any Patents that contain one or more claims that cover Joint Inventions.

1.77

“Know-How”  means  any  information,  including  discoveries,  improvements,  modifications,  processes,
methods,  techniques,  protocols,  formulas,  data,  inventions,  know-how,  trade  secrets  and  results,  patentable  or  otherwise,
including  physical,  chemical,  biological,  toxicological,  pharmacological,  safety,  and  pre-clinical  and  clinical  data,  dosage
regimens, control assays, and product specifications, but excluding any Patents.

1.78

“Licensed Field” means all therapeutic uses in humans.

1.79

“Licensed Know-How” means all Know-How that Spero Controls as of the Amendment Effective Date or
during  the  Term  that  is  necessary  or  reasonably  useful  for  the  Development,  Manufacture,  Commercialization  or  other
Exploitation of the Compound or any Licensed Product for use in the Licensed Field in the Territory, including all Spero Sole
Inventions  in  the  Territory,  Spero  Development  Data  and  Spero  Regulatory  Documentation  (with  respect  to  Compound  or  a
Licensed Product).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

11

 
 
 
1.80
Technology Transfer).

“Licensed  Manufacturing  Know-How”  has  the  meaning  set  forth  in  Section  7.2  (Manufacturing

1.81

“Licensed  Product”  means  any  pharmaceutical  product  that  contains  the  Compound,  alone  or  in
combination with one or more other molecules or agents in any dosage form or formulation.  For purposes of this Agreement,
with respect to a Licensed Product that has been approved for an initial Indication, the approval of such Licensed Product for one
or more additional Indications shall not constitute a new and separate Licensed Product.

1.82

“Licensed  Product  Agreement”  means,  with  respect  to  the  Compound  or  any  Licensed  Product,  any
agreement entered into by and between Everest or any of its Affiliates or its or their Sublicensees, on the one hand, and one or
more Third Parties, on the other hand, that is necessary or reasonably useful for the Exploitation of the Compound or a Licensed
Product  in  the  Licensed  Field  in  the  Territory,  including  without  limitation:  (a)  any  agreement  (other  than  this  Agreement)
pursuant to which Everest, any of its Affiliates or any of its or their Sublicensees receives any license or other rights to Exploit
the  Compound  or  a  Licensed  Product;  (b)  any  supply  agreement  (other  than  the  Initial  Supply  Agreement)  pursuant  to  which
Everest, any of its Affiliates or any of its or their Sublicensees obtains quantities of the Compound or a Licensed Product; (c) any
clinical trial agreements; (d) any contract research organization agreements; and (e) any service agreements.  

1.83

“Licensed  Technology”  means  the  Licensed  Know-How  and,  if  applicable  in  accordance  with  the
provisions of Section 3.4(b) (In-License Agreements), Infringed IP that Third Parties have licensed to Spero under the relevant
In-License Agreements.

1.84

“MAA” or “Marketing Authorization Application” means an application to the appropriate Regulatory
Authority  for  approval  to  market  a  Licensed  Product  (but  excluding  Pricing  Approval)  in  any  particular  jurisdiction,  and  all
amendments,  renewals  and  supplements  thereto,  including  an  NDA  filed  with  the  FDA  in  the  U.S.  or  an  NDA  (or  any  future
equivalent thereto as defined in the DAL and the Provisions for Drug Registration) filed with the NMPA in the Territory.

1.85

“Mainland China” means the People’s Republic of China, including Hainan Island, but excluding Hong

Kong, the Macau Special Administrative Region of the People’s Republic of China and Taiwan.

1.86

“Manufacture”  and  “Manufacturing”  means  all  activities  related  to  the  production,  manufacture,
processing, filling, finishing, packaging, labeling, in-process and finished testing, shipping, storing, or release of a product or any
ingredient  or  intermediate  thereof,  including  process  development,  process  qualification  and  validation,  scale-up,  pre-clinical,
clinical and commercial manufacture and analytic development, product characterization, test method development and stability
testing, formulation, quality assurance and quality control of the any compound, product or intermediate, and regulatory affairs
with respect to the foregoing.

1.87

“Manufacturing Transfer Period”  has  the  meaning  set  forth  in  Section  7.2  (Manufacturing  Technology

Transfer).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

12

 
 
 
1.88
Payments – clause (a)).

“Milestone Event” has the meaning set forth in Section 9.2 - (8.2 Development and Regulatory Milestone

1.89

“Milestone  Payment”  has  the  meaning  set  forth  in  Section  9.2  -  (8.2  Development  and  Regulatory

Milestone Payments – clause (a)).

1.90

“NDA”  means  a  New  Drug  Application  (as  more  fully  defined  in  21  C.F.R.  §314.5  et  seq.  or  successor

regulation) and all amendments and supplements thereto filed with the FDA and any other equivalent filings in the Territory.

1.91

“Net Sales”  means,  with  respect  to  any  Licensed  Product,  the  gross  amounts  invoiced  for  sales  or  other
dispositions of such Licensed Product (excluding transfer or dispositions of product at or below manufacturing cost, or without
charge,  for  nonclinical  or  clinical  purposes,  research,  commercial  samples,  compassionate  use,  indigent  programs  and
humanitarian  and  charitable  donations)  by  or  on  behalf  of  Everest,  its  Affiliates  and  Sublicensees  to  Third  Parties,  less  the
following  deductions  to  the  extent  included  in  the  gross  invoiced  sales  price  for  such  Licensed  Product  or  otherwise  paid  or
incurred by Everest or its Affiliates, as applicable, with respect to the sale or other disposition of such Licensed Product:

allowed and properly taken with respect to sales of such Licensed Product;

(a)

normal  and  customary  trade  and  quantity  and  cash  discounts,  allowances,  and  credits  actually

for retroactive price reductions and billing errors;

(b)

credits or allowances given or made for rejection or return of previously sold Licensed Products or

(c)

discounts,  rebates,  reimbursements,  and  chargeback  payments  granted  to  managed  health  care
organizations  or  other  health  care  institutions  (including  hospitals),  health  care  administrators,  patient  assistance  or  similar
programs, pharmacy benefit managers (or equivalents thereof), wholesalers and other distributors, pharmacies and other retailers,
group  purchasing  organizations  or  other  buying  groups,  health  maintenance  organizations,  national,  state/provincial,  local,  and
other governments, their agencies and purchasers and reimbursers, any other providers of health insurance coverage, or to trade
customers;

(d)
such Licensed Product;

costs of freight, postage, insurance, and other transportation charges related to the distribution of

such Licensed Product (excluding Taxes imposed on or with respect to net income, however, denominated);

(e)

any Taxes levied on or with respect to such Licensed Product or measured by the billing amount of

organizations or pharmaceutical benefit managers relating to such Licensed Product; and

(f)

the  portion  of  administrative  fees  paid  during  the  relevant  time  period  to  group  purchasing

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

13

 
 
 
collection efforts, in accordance with GAAP and standard practices of the applicable party.

(g)

amounts invoiced for sales of Licensed Product that are written off as uncollectible after reasonable

Such amounts shall be determined in accordance with GAAP, consistently applied.  Any of the deductions listed above
that involves a payment by Everest, its Affiliates or its or their Sublicensees shall be taken as a deduction in the Calendar Quarter
in which the payment is accrued by such entity.  For purposes of determining Net Sales, a Licensed Product shall be deemed to be
sold  when  invoiced.  Everest’s,  its  Affiliates’  or  its  or  their  Sublicensees’  transfer  of  any  Licensed  Product  to  an  Affiliate  or
Sublicensee  shall  not  result  in  any  Net  Sales  unless  such  Licensed  Product  is  consumed  or  administered  by  such  Affiliate  or
Sublicensee in the course of its commercial activities.  With respect to any Licensed Product that is consumed or administered by
Everest or its Affiliates or its or their Sublicensees, Net Sales shall include any amount billed or invoiced with respect to such
consumption or administration, including any services provided directly in connection therewith.

In the event that a Licensed Product is sold as part of a Combination Product, then Net Sales for such product shall be
determined by multiplying the net sales of the Combination Product (as calculated in accordance with analogous criteria as set
forth above for the “Net Sales” definition) by the fraction, A / (A+B) where A is the weighted average sale price of such Licensed
Product  when  sold  separately  in  finished  form,  and  B  is  the  weighted  average  sale  price  of  the  other  active  compound  or
ingredient in the Combination Product sold separately in finished form.

In the event that the weighted average sale price of a Licensed Product can be determined but the weighted average sale
price  of  the  other  active  compound  or  ingredient  in  the  Combination  Product  cannot  be  determined,  then  Net  Sales  for  such
product shall be calculated by multiplying the net sales of the Combination Product (as calculated in accordance with analogous
criteria as set forth above for the “Net Sales” definition) by the fraction A / C where A is the weighted average sale price of such
Licensed Product when sold separately in finished form and C is the weighted average sale price of the Combination Product.

In  the  event  that  the  weighted  average  sale  price  of  the  other  active  compounds  or  ingredients  in  the  Combination
Product  can  be  determined  but  the  weighted  average  sale  price  of  such  Licensed  Product  cannot  be  determined,  Net  Sales  for
such  product  shall  be  calculated  by  multiplying  the  net  sales  of  the  Combination  Product  (as  calculated  in  accordance  with
analogous criteria as set forth above for the “Net Sales” definition) by the following formula: one (1) minus B / C where B is the
weighted  average  sale  price  of  the  other  active  compound  or  ingredient  in  the  Combination  Product  when  sold  separately  in
finished form and C is the weighted average sale price of the Combination Product.

In  the  event  that  the  weighted  average  sale  price  of  both  a  Licensed  Product  and  the  other  active  compound  or
ingredient  in  the  Combination  Product  cannot  be  determined,  then  Net  Sales  for  such  product  shall  be  equal  to  [***]  percent
([***]%) of the net sales of the Combination Product (as calculated in accordance with analogous criteria as set forth above for
the “Net Sales” definition).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

14

 
 
 
1.92

“NMPA”  means  the  National  Medical  Products  Administration  of  the  People’s  Republic  of  China,  f.k.a.

China Food and Drug Administration, or its successor.

1.93

 “Original License” has the meaning set forth in the Recitals.

1.94

“Patent”  means  all  patents  and  patent  applications,  including  all  provisionals,  divisionals,  reissues,
reexaminations,  renewals,  continuations,  continuations-in-part,  substitute  applications,  priority  applications  and  inventors’
certificates, extensions and supplemental certificates and any and all foreign equivalents of the foregoing.

1.95

“Payment” has the meaning set forth in Section 9.8(b).

1.96

“Permitted  Liens”  means:  (a)  liens  securing  indebtedness  for  borrowed  money;  (b)  security  interests  in
assets to secure indebtedness for borrowed money; (c) purchase money liens on secured purchase money indebtedness; (d) liens
to  secure  capitalized  lease  obligations;  (e)  liens  for  Taxes,  the  nonpayment  of  which  is  being  contested  in  good  faith  by
appropriate proceedings and for which adequate reserves or appropriate provisions, if any, as shall be required by GAAP shall
have  been  set  aside  on  such  Person's  books;  (f)  statutory  or  similar  liens  of  carriers,  warehousemen,  mechanics,  laborers,
materialmen and landlords incurred in the ordinary course of business for sums not yet due or being contested in good faith; (g)
liens  arising  out  of  judgments  or  awards,  and  appeals  and  similar  bonds  incident  to  the  conduct  of  legal  actions  against  such
Person, which such Person shall then be prosecuting an appeal or other proceedings for review; and (h) liens (including deposits)
incurred in the ordinary course of business to secure bids or tenders or the performance of statutory obligations, leases, contracts,
surety  and  appeal  bonds,  performance  bonds,  and  other  obligations  of  a  like  nature,  and  other  encumbrances  incidental  to  the
normal conduct of the business of such Person.

1.97

“Person” means any individual, partnership, limited liability company, firm, corporation, association, trust,

unincorporated organization or other entity.

1.98

“Phase  1  Clinical  Trial”  means  a  human  clinical  trial  that  would  satisfy  the  requirements  for  a  Phase  1
study as defined in 21 CFR § 312.21(a) (or any amended or successor regulations) or any equivalent regulations in jurisdictions
in the Territory, regardless of where such clinical trial is conducted.

1.99

“Phase  3  Clinical  Trial”  means  a  human  clinical  trial  that  would  satisfy  the  requirements  for  a  Phase  3
study as defined in 21 CFR § 312.21(c) (or any amended or successor regulations) or any equivalent regulations in jurisdictions
in the Territory, regardless of where such clinical trial is conducted.

1.100

1.101

“Polymyxin Class Compound” has the meaning set forth in Section 3.8 (Non-Compete).

“Potentiator” has the meaning set forth in the introduction to this Agreement.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

15

 
 
 
1.102

“Pricing  Approval”  means  such  governmental  approval,  agreement,  determination  or  decision
establishing prices for a Licensed Product that can be charged and/or reimbursed in a regulatory jurisdiction where the applicable
Government  Authority  approves  or  determines  the  price  and/or  reimbursement  of  pharmaceutical  products  and  where  such
approval or determination is necessary for the commercial sale of such Licensed Product in such jurisdiction.

1.103

“Product Infringement” has the meaning set forth in Section 10.4(a) (Notice).

1.104

“Product Trademarks” means the Trademark(s) used or to be used by Everest or its Affiliates or its or
their Sublicensees for the Commercialization of Licensed Products in the Licensed Field in the Territory and any registrations
thereof or any pending applications relating thereto in the Territory (excluding, in any event, any Corporate Names and any Spero
Trademarks  that  consist  of  or  include  any  corporate  name  or  corporate  logo  of  Spero  or  its  Affiliates  or  its  (sub)licensees  (or
Sublicensees)).

1.105

“Receiving Party” has the meaning set forth in Section 11.1(a) (Duty of Confidence - subsection (a)).

1.106

“Reimbursement Rate” means, with respect the costs to Spero or Everest of conducting a clinical trial,
the costs of services provided by one Party to the other Party on an FTE-based compensation rate or any similar FTE-based costs
to be paid for or reimbursed hereunder, a blended FTE rate of $[***] per annum, or $[***] per hour.

1.107

“Regulatory  Approval”  means,  with  respect  to  a  jurisdiction  in  the  Territory,  any  and  all  approvals
(including  approvals  of  Marketing  Authorization  Applications),  licenses,  registrations  or  authorizations  of  any  Regulatory
Authority  necessary  to  commercially  distribute,  sell  or  market  a  Licensed  Product  in  such  jurisdiction,  including,  where
applicable:  (a)  pricing  or  reimbursement  approval  in  such  jurisdiction;  (b)  pre-  and  post-approval  marketing  authorizations
(including any prerequisite Manufacturing approval or authorization related thereto); and (c) labelling approval.

1.108

“Regulatory  Authority”  means  any  applicable  Government  Authority  responsible  for  granting
Regulatory  Approvals  for  any  Licensed  Product,  including  the  FDA,  the  NMPA,  and  any  corresponding  national  or  regional
regulatory authorities.

1.109

“Regulatory Documentation” means: all (a) applications (including all Regulatory Filings, INDs, CTAs
and  Marketing  Authorization  Applications),  registrations,  licenses,  authorizations  and  approvals  (including  Regulatory
Approvals); (b) correspondence and reports submitted to or received from Regulatory Authorities (including minutes and official
contact  reports  relating  to  any  communications  with  any  Regulatory  Authority)  and  all  supporting  documents  with  respect
thereto, including all adverse event files and complaint files; and (c) clinical and other data contained or relied upon in any of the
foregoing; in each case (a), (b) and (c)) relating to the Compound or a Licensed Product.

1.110

“Regulatory Exclusivity”  means  any  exclusive  marketing  rights  or  data  exclusivity  rights  conferred  by

any Regulatory Authority with respect to a pharmaceutical product

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

16

 
 
 
other than Patents, and including, without limitation, orphan drug exclusivity, new chemical entity exclusivity, data exclusivity or
pediatric exclusivity.

1.111

“Regulatory Filings”  means,  with  respect  to  the  Compound  or  Licensed  Products,  any  submission  to  a
Regulatory Authority of any appropriate regulatory application specific to the Compound or Licensed Products, and shall include,
without limitation, any submission to a regulatory advisory board and any supplement or amendment thereto.  For the avoidance
of doubt, Regulatory Filings shall include any IND, CTA, NDA, MAA, Regulatory Approval or the corresponding application in
any other country or jurisdiction.

1.112

1.113

“Representative” has the meaning set forth in Section 11.1(c) (Duty of Confidence - Subsection (c)).

“Respective Territory” means, in the case of Everest, the Territory, and in the case of Spero, all countries

of the world outside the Territory.

1.114

“Retained Rights” means:

(i)

with  respect  to  the  Compound  and  Licensed  Products,  the  rights  of  Spero,  its  Affiliates  and  its  and  their

licensors, (sub)licensees and contractors to:

(a)

(b)

perform its and their obligations under this Agreement;

Manufacture,  have  Manufactured,  Develop  and  have  Developed  the  Compound  or  Licensed

Products, within the Territory solely for Exploitation outside the Territory; and

Products for any and all purposes outside the Territory; and

(c)

Develop,  Manufacture,  Commercialize  and  otherwise  Exploit  the  Compound  and  Licensed

(ii)

with respect to any compounds other than the Compound and any products other than the Licensed Products,
the rights of Spero, its Affiliates and its and their licensors, (sub)licensees and contractors to make, use, import, export, research,
develop,  manufacture,  hold  or  keep,  or  have  made,  used,  imported,  exported,  researched,  developed,  manufactured,  held  or
kept,    such  other  compounds  and  products  within  the  Territory  solely  for  marketing,  offering  for  sale  or  commercialization
outside the Territory.  

1.115

1.116

“Royalty Term” has the meaning set forth in Section 9.4(b) (Royalty Term).

“SEC” has the meaning set forth in Section 11.5 (Publicity/Use of Names - subsection (a)).

1.117
Chief Executive Officer.

“Senior Officer” means, with respect to Spero, its Chief Executive Officer, and with respect to Everest, its

1.118

“[***]” has the meaning set forth in Section 15.10(b) (Dispute Resolution).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

17

 
 
 
1.119

“Spero CMO” has the meaning set forth in Section 7.2 (Manufacturing Technology Transfer)

1.120

“Spero  Development  Data”  means  any  (a)  pharmacology,  toxicology  and  other  biological  data
Controlled  by  Spero  related  to  the  Compound  or  any  Licensed  Product  or  otherwise  included  in,  or  filed  in  support  of,  the
Regulatory  Documentation  filed  by  Spero  outside  of  the  Territory  and  (b)  clinical  data  Controlled  by  Spero  related  to  the
Compound or any Licensed Product or otherwise included in, or filed in support of, the Regulatory Documentation filed by Spero
outside of the Territory

1.121

“Spero Indemnitees” has the meaning set forth in Section 14.2 (Indemnification by Everest).

1.122

“Spero  Sole  Inventions”  means  any  Inventions  that  are  conceived  and  reduced  to  practice  solely  by
employees of, or consultants or service providers to, Spero, at any time during the Term of this Agreement and that are made,
generated, conceived or otherwise invented as a result of a Party exercising its rights or carrying out its obligations under this
Agreement,  whether  directly  or  via  its  Affiliates,  agents  or  independent  contractors,  which  Inventions  relate  solely  and
exclusively  to  the  Compound  and  Licensed  Products  or  the  method  of  use  or  manufacture  thereof,  and  not  to  any  other
compound, structure or composition of matter or the method of use or manufacture thereof.

1.123

“Spero Sole Invention Patents” means any Patents in the Territory that contain one or more claims that

cover Spero Sole Inventions.

1.124

“Spero  Trademarks”  means  any  corporate  name  or  corporate  logo  of  Spero  or  its  Affiliates,  and  any
Trademark  that  consists  of  or  includes  any  corporate  name  or  corporate  logo  of  Spero  or  its  Affiliates  (“Corporate  Names”),
including the Spero Trademarks, names and logos identified on Exhibit B hereto and such other Trademarks, names and logos as
Spero may designate in a writing sent to Everest from time to time during the Term.

1.125

“SPR206” means the compound known as SPR206 and having the chemical structure shown in Exhibit C

and [***].

1.126

“SPR741” means the compound known as SPR741 and having the chemical structure shown in Exhibit D

and [***].

1.127

“SPR741 Option” has the meaning set forth in the Recitals.

1.128

“Sublicense” means a license or sublicense granted by Everest (or a Sublicensee) to Develop, make, use,
import, promote, offer for sale or sell the Compound or any Licensed Product, including any license given to any of the rights
granted to Everest under Section 3.1(Licenses to Everest).

1.129

“Subcontractor” has the meaning set forth in Section 3.9 (Subcontracting).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

18

 
 
 
1.130

“Sublicensee”  means  a  Third  Party  to  whom  Everest  or  its  Affiliate  has  granted  a  Sublicense  in

accordance with the terms of this Agreement.

1.131

“Successive Term” has the meaning set forth in Section 12.1 (Term).

1.132

“Tax” or “Taxes” means any (a) all federal, provincial, territorial, state, municipal, local, foreign or other
taxes,  imposts,  rates,  levies,  assessments  and  other  charges  in  the  nature  of  a  tax  (and  all  interest  and  penalties  thereon  and
additions  thereto  imposed  by  any  Government  Authority),  including  without  limitation  all  income,  excise,  franchise,  gains,
capital, real property, goods and services, transfer, value added, gross receipts, windfall profits, severance, ad valorem, personal
property,  production,  sales,  use,  license,  stamp,  documentary  stamp,  mortgage  recording,  employment,  payroll,  social  security,
unemployment, disability, escheat, estimated or withholding taxes, and all customs and import duties, together with all interest,
penalties and additions thereto imposed with respect to such amounts, in each case whether disputed or not; (b) any liability for
the payment of any amounts of the type described in subsection  (a) as a result of being or having been a member of an affiliated,
consolidated, combined or unitary group; and (c) any liability for the payment of any amounts as a result of being party to any tax
sharing agreement or arrangement or as a result of any express or implied obligation to indemnify any other person with respect
to the payment of any amounts of the type described in subsection (a) or (b).

1.133

“Term” has the meaning set forth in Section 12.1 (Term).

1.134

“Territory”  means  Greater  China  (Mainland  China,  Hong  Kong,  the  Macau  Special  Administrative
Region of the People’s Republic of China, and Taiwan), the Republic of Korea (South Korea) and Southeast Asia (the Republic
of  Singapore,  Malaysian  Federation,  Kingdom  of  Thailand,  the  Republic  of  Indonesia,  Socialist  Republic  of  Vietnam  and  the
Republic of the Philippines).

1.135

“Third Party” means any Person other than a Party or an Affiliate of a Party.

1.136
Third Parties).

“Third Party Infringement Claim” has  the  meaning  set  forth  in  Section  10.5  (Infringement  claims  by

1.137

“Trademark”  means  any  word,  name,  symbol,  color,  shape,  designation  or  any  combination  thereof,
including  any  trademark,  service  mark,  trade  name,  brand  name,  sub-brand  name,  trade  dress,  product  configuration  rights,
program  name,  delivery  form  name,  certification  mark,  collective  mark,  logo,  tagline,  slogan,  design  or  business  symbol,  that
functions as an identifier of source, origin or quality, whether or not registered, and all statutory and common law rights therein
and all registrations and applications therefor, together with all goodwill associated with, or symbolized by, any of the foregoing.

1.138

1.139

“Transfer Tax” has the meaning set forth in Section 9.8(c) (Transfer Tax).

“United States” or “U.S.” means the United States of America including its territories and possessions.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

19

 
 
 
1.140

“Valid  Claim”  means,  with  respect  to  any  jurisdiction  in  the  Territory,  (a)  a  claim  of  an  issued  and
unexpired Patent (as may be extended through supplementary protection certificate or patent term extension or the like) that has
not  been  cancelled,  revoked,  held  invalid  or  unenforceable  by  a  decision  of  a  patent  office  or  other  Government  Authority  of
competent jurisdiction from which no appeal can be taken (or from which no appeal was taken within the allowable time period)
and which claim has not been disclaimed, denied or admitted to be invalid or unenforceable through reissue, re-examination or
disclaimer or otherwise; or (b) a claim of a Patent application pending for no more than [***] years that has not been cancelled,
withdrawn or abandoned or finally rejected by an administrative agency action from which no appeal can be taken; provided that
in each of (a) and (b) in any jurisdiction in the Territory, a Valid Claim shall cease to be a Valid Claim in such jurisdiction if it
does not block or prevent the entry, or Commercialization, of Generic Products.

1.141

Interpretation. In this Agreement, unless otherwise specified:

without limitation;

(a)

(b)

shall include all genders;

“includes”  and  “including”  shall  mean,  respectively,  includes  without  limitation  and  including

words denoting the singular shall include the plural and vice versa and words denoting any gender

merely to the particular provision in which such words appear; and

(c)

words  such  as  “herein”,  “hereof”,  and  “hereunder”  refer  to  this  Agreement  as  a  whole  and  not

references to this Agreement shall include references to the Exhibits and attachments.

(d)

the  Exhibits  and  other  attachments  form  part  of  the  operative  provision  of  this  Agreement  and

2.1

Assignment.

ARTICLE 2
ASSIGNMENT

(a)

Spero hereby assigns, transfers and sets over to Everest all of its right, title and interest in and to
any and all Assigned Patents (the “Assignment”), including, without limitation, all statutory and common law rights attaching to
the  Assigned  Patents  (including  the  right  to  file  application,  prosecution  and  maintenance  of  any  Assigned  Patents),  now  or
hereafter in effect, for Everest’s own use and enjoyment, and for the use and enjoyment of Everest’s successors, assigns or other
legal representatives, as fully and entirely as the same would have been held and enjoyed by Spero if this Assignment has not
been  made,  together  with  all  income,  royalties,  damages  or  payments  due  or  payable  as  of  the  Amendment  Effective  Date  or
thereafter (excluding all income, royalties, damages or payments due or payable to Spero pursuant to this Agreement), including,
without limitation and except as otherwise set forth in this Agreement, all claims for damages by reason of past, present or future
infringement or other unauthorized use of the Assigned Patents, with the right to sue for, and collect the same for its own use and
enjoyment, and for the use and enjoyment of its successors, assigns or other legal representatives.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

20

 
 
 
(b)

Spero and Everest shall, at Everest’s expense, cooperate to prepare and file deeds of assignments or
such other instruments of assignment in the patent office or any equivalent government agency in the relevant jurisdictions in the
Territory  as  are  necessary  to  record  Everest  as  the  owner  of  the  Assigned  Patents,  and  Spero  agrees  to  provide  (at  Everest’s
expense)  any  assistance  reasonably  required  by  Everest  to  record  and  perfect  such  transfer  of  ownership  of  the  Assigned
Patents.  

(c)

Without  affecting  any  other  provision  of  this  Agreement,  Spero  unconditionally  and  irrevocably
covenants,  without  limitation  in  time,  that  it  shall  not,  and  that  it  shall  ensure  that  its  licensees  do  not,  assert  or  raise  against
Everest  or  any  of  its  licensees  or  assignees,  any  claim  or  action  in  relation  to  any  use  of  the  Assigned  Patents  after  the
Amendment Effective Date.

Each Party shall perform  (or  procure  the  performance  of)  all  further  acts  and  things and execute
and deliver (or procure the execution and delivery of) such further documents, as may be required by Applicable Law or as may
be necessary or reasonably required by Everest to implement and give effect to the Assignment.

(d)

(e)

At  any  time  during  the  Term  if  (i)  Everest  desires  to  discontinue  the  development  and
commercialization of the Compound and the Licensed Products, or (ii) this Agreement is terminated (A) by Everest pursuant to
Section 12.2(a), or (B) by Spero pursuant to Section 12.2(b), 12.2(b) or 12.2(d), then Everest shall (1) grant Spero the license as
applicable on the terms of Section 12.3(c) (Consequences of Termination), and (2) promptly (but in no event later than [***] days
before an action is due where inaction would result in abandonment of and Assigned Patent) notify Spero in writing and Spero
shall have an exclusive option, exercisable within [***] days after the receipt of such notice, to notify Everest in writing of its
intent to acquire back the Assigned Patents.   Upon receiving Spero’s notice of its intent to so acquire back the Assigned Patents
Everest shall assign any of the affected Assigned Patents back to Spero on the same material terms and conditions as those of the
Assignment under Section 2.1 (except this Section 2.1(e) and Section 2.1(e)).

(f)

At any time during the Term if Everest desires to abandon any, but not all,  of the Assigned Patents
(including an Assigned Patent added after the Amendment Effective Date)  or any Joint Patent, then Everest shall notify Spero in
writing promptly (but in no event later than [***] days before an action is due where inaction would result in abandonment of
such Assigned Patent(s)) or such Joint Patent and Spero shall have an exclusive option, exercisable within [***] days after the
receipt of such notice, to notify Everest in writing if it intends to acquire back the affected Assigned Patents and/or to acquire
Everest’s interest in such Joint Patent. Upon receiving Spero’s notice, Everest shall assign any of the affected Assigned Patents
and/or its rights in such Joint Patent to Spero on the same material terms and conditions as those of the Assignment under this
Section 2.1 (except Section 2.1(e) and this Section 2.1(e)).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

21

 
 
 
3.1

License to Everest.

ARTICLE 3
LICENSES

Subject to the terms and conditions of this Agreement, Spero hereby grants to Everest an exclusive
(even as to Spero), royalty-bearing license under the Licensed Technology solely to Exploit Licensed Products in the Licensed
Field in the Territory, with the right to grant sublicenses in accordance with Section 3.3 (Sublicense Rights).

(a)

(b)

The United States federal government retains rights in certain of the Assigned Patents pursuant to
35 U.S.C. §§ 200-212 and 37 C.F.R. § 401 et seq., and any right granted in this Agreement greater than that permitted under 35
U.S.C. §§ 200-212 or 37 C.F.R. § 401 et seq. will be deemed modified as may be required to conform to the provisions of those
statutes and regulations.

3.2

License to Spero.  Subject to the terms and conditions of this Agreement, Everest hereby grants to Spero an
exclusive  (even  as  to  Everest),  royalty-free  license  under  the  Everest  Technology  (excluding  Assigned  Patents,  Everest  Sole
Invention Patents in the Territory, and Joint Patents in the Territory) solely to Exploit Licensed Products in the Licensed Field
outside the Territory, with the right to grant sublicenses in accordance with Section 3.3 (Sublicense Rights).  

3.3

Sublicense Rights.  

(a)

Affiliates.    Subject  to  the  terms  of  this  Section  3.3  (Sublicense  Rights),  Everest  may  grant  a
sublicense of the license granted in Section 3.1 (License to Everest) through multiple tiers to Affiliates of Everest without prior
notice to or the prior consent of Spero; provided that (i) Everest shall cause each Affiliate to comply with the applicable terms
and conditions of this Agreement, as if such Affiliate were a Party to this Agreement; and (ii) Everest shall be responsible for all
actions, activities and obligations to Spero of such Affiliate.  Subject to the terms of this Section 3.3 (Sublicense Rights), Spero
may  grant  a  sublicense  of  the  license  granted  in  Section  3.2  (License  to  Spero)  through  multiple  tiers  to  Affiliates  of  Spero
without  prior  notice  to  or  the  prior  consent  of  Everest;  provided  that  (i)  Spero  shall  cause  each  Affiliate  to  comply  with  the
applicable terms and conditions of this Agreement, as if such Affiliate were a Party to this Agreement; and (ii) Spero shall be
responsible for all actions, activities and obligations to Everest of such Affiliate.

(b)

Third  Parties.    Upon  the  prior  written  consent  of  Spero,  such  consent  not  to  be  unreasonably
withheld, conditioned, or delayed, Everest may grant a sublicense of the rights granted under the license in Section 3.1 (License
to Everest) through multiple tiers to any Third Party; provided that (i) each sublicense granted to a Third Party shall be in writing,
and shall incorporate terms and conditions that are consistent with, and expressly made subject to, the terms and conditions of
this Agreement; (ii) Spero shall be provided by Everest with a copy of such sublicense agreement within [***] days of execution,
which copy may redact any financial or other proprietary terms; and (iii) Everest shall be responsible to Spero for a breach of this
Agreement due to the breach by such Third Party of such sublicense agreement. Everest hereby waives any

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

22

 
 
 
requirement  that  Spero  exhaust  any  right,  power  or  remedy,  or  proceed  against  any  such  sublicensee  for  any  obligation  or
performance under this Agreement prior to proceeding directly against Everest.  Upon the prior written consent of Everest, such
consent not to be unreasonably withheld, conditioned, or delayed, Spero may grant a sublicense of the rights granted under the
license in Section 3.2 (License to Spero) through multiple tiers to any Third Party; provided that (i) each sublicense granted to a
Third Party shall be in writing, and shall incorporate terms and conditions that are consistent with, and expressly made subject to,
the terms and conditions of this Agreement; (ii) Everest shall be provided by Spero with a copy of such sublicense agreement
within [***] days of execution, which copy may redact any financial or other priority terms; and (iii) Spero shall be responsible
to Everest for a breach of this Agreement due to the breach by such Third Party of such sublicense agreement.    Spero  hereby
waives any requirement that Everest exhaust any right, power or remedy, or proceed against any sublicensee for any obligation or
performance under this Agreement prior to proceeding directly against Spero.

(c)

A  copy  of  each  sublicense  agreement  with  any  Third  Party  shall,  without  redaction,  be  made
available to (i) pursuant to Section 9.9 (Financial Records and Audit), any independent certified public accountant for the purpose
of verifying for Spero the accuracy of the financial reports furnished by Everest under this Agreement or of any payments made,
or required to be made, by Everest to Spero pursuant to this Agreement and (ii) pursuant to Section 9.10 (Audit Dispute), any
Auditor resolving a financial disagreement between the Parties.

distinct from the rights to sublicense pursuant to this Section 3.3 (Sublicense Rights).

(d)

For  clarity,  the  rights  of  the  Parties  under  Section  6.3  (Rights  of  Reference)  are  separate  and

(e)

Under  the  Original  License,  Potentiator  granted  to  Everest  an  exclusive  SPR741  Option,
exercisable  by  written  notice  from  Everest  to  Potentiator  to  negotiate  a  license  agreement  providing  an  exclusive  (even  as  to
Potentiator)  license  to  the  Patents  and  Know-How  covering  SPR741  in  the  Licensed  Field  in  the  Territory.  Everest  and
Potentiator  acknowledge  that  Everest  has  now  determined  not  to  exercise  the  SPR741  Option  under  the  Original  License,  and
Everest and Potentiator agree that all the terms of the Original License associated with the SPR741 Option shall cease to have
effect as of the Amendment Effective Date and shall be removed from this Agreement.

3.4

Spero’s Retained Rights; Limitations of License Grants.  

(a)

Retained  Rights  of  Spero.    Notwithstanding  anything  to  the  contrary  in  this  Agreement  and
without limitation of any rights granted or reserved to Spero pursuant to any other term or condition of this Agreement, Spero
hereby  expressly  retains,  on  behalf  of  itself  and  its  Affiliates  (and  on  behalf  of  its  and  their  direct  and  indirect  Third  Party
licensors  under  any  In-License  Agreement,  (sub)licensees  and  contractors)  all  right,  title  and  interest  in  and  to  the  Assigned
Patents,  the  Licensed  Know-How,  Spero  Development  Data,  Spero’s  interests  in  and  to  Joint  Patents  and  Joint  Know-How,
Regulatory  Documentation  of  Spero  and  the  Corporate  Names  of  Spero  and  its  Affiliates,  in  each  case,  for  purposes  of
performing or exercising the Retained Rights.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

23

 
 
 
(b)

In-License Agreements

A.

If Spero or any of its Affiliates intends to negotiate with a Third Party at arms’ length to
obtain a license to Infringed IP (an “In-License Agreement”), then Spero shall promptly notify Everest and identify the relevant
Third Party’s Infringed IP, with a copy to the JDC, and obtain Everest’s prior written consent before entering into any In-License
Agreement.    The  applicable  Third  Party’s  Infringed  IP  shall  be  included  in  the  license  granted  to  Everest  under  Section  3.1
(License to Everest) and considered Licensed Technology, respectively, only if Spero discloses the substantive terms of the In-
License Agreement to Everest, which Spero hereby agrees to do, and Everest agrees in writing to (A) comply with all the relevant
obligations of such In-License Agreement, and (B) pay [***]% of all upfront, milestone, royalty and other payments applicable
to the Development, Manufacture or Commercialization of the Compound or any Licensed Product in the Licensed Field in the
Territory; provided, however, that, such upfront, milestone, royalty and other payments should be (x) at fair market value for such
a license in the Territory; and (y) directly attributable to the Development, Manufacture or Commercialization of the Compound
or any Licensed Product in the Licensed Field in the Territory, or outside the Territory for use in the Territory, by Everest or any
of  its  Affiliates  or  any  Sublicensees.    For  the  avoidance  of  doubt,  if  Everest  reasonably  determines  that  such  Third  Party’s
Infringed  IP  under  the  In-License  Agreement  is  not  necessary  for  the  Development,  Manufacture  or  Commercialization  of  the
Compound or any Licensed Product in the Licensed Field in the Territory, Everest has the right not to pay any costs associated
with such In-License Agreement, in which case such Infringed IP shall not be included in the license granted to Everest under
Section 3.1 (License to Everest) nor considered to be Licensed Technology.

B.

Subject  to  Section  3.4(b)F  (In-License  Agreements)  below,  if  Everest  or  any  of  its
Affiliates  or  Sublicensees  negotiates  with  a  Third  Party  at  arms’  length  to  obtain  a  license  to  Infringed  IP,  then  Everest  shall
promptly notify Spero and identify the relevant Third Party’s Infringed IP, with a copy to the JDC.  The applicable Third Party’s
Infringed IP shall be  included  in  the  license  granted  by  Everest  to  Spero  under Section 3.2 (License to Spero) and considered
Everest Patents and Everest Know-How, respectively, only if Everest discloses the substantive terms of such Third Party license
to Spero, which Everest hereby agrees to do, and Spero agrees in writing to (A) comply with all the relevant obligations of such
Third  Party  license;  (B)  pay  [***]%  of  all  upfront,  milestone,  royalty  and  other  payments  applicable  to  the  Development,
Manufacture or Commercialization of the Compound or any Licensed Product in the Licensed Field in the Territory; and (C) pay
all  upfront,  milestone,  royalty  and  other  payments  applicable  to  the  Development,  Manufacture  or  Commercialization  of  the
Compound or any Licensed Product in the Licensed Field outside the Territory; provided, however, that, such upfront, milestone,
royalty and other payments under clause (B) above should be (x) at fair market value for such a license in the Territory; and (y)
directly  attributable  to  the  Development,  Manufacture  or  Commercialization  of  the  Compound  or  any  Licensed  Product  in  the
Licensed  Field  in  the  Territory,  or  outside  the  Territory  for  use  in  the  Territory,  by  Everest  or  any  of  its  Affiliates  or  any
Sublicensees.  For the avoidance of doubt, if Spero reasonably determines that such Third Party’s Infringed IP is not necessary
for the Development, Manufacture or Commercialization of the Compound or any Licensed Product in the Licensed Field outside
the Territory, Spero has the right not to pay any costs associated with such Third Party license, in

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

24

 
 
 
which  case  such  Infringed  IP  shall  not  be  included  in  the  license  granted  to  Spero  under  Section  3.2  (License  to  Spero)  nor
considered to be Everest Patents and Everest Know-How. In the event that Spero does agree to accept such Third Party license,
the provisions of clauses (3), (4) and (5) of this Section 3.4(b) (In-License  Agreements)  shall  apply,  mutatis, mutandis,  to  any
such Third Party license.

C.

Subject to this Section 3.4(b) (In-License Agreements), the licenses granted by Spero in
Section 3.1 (License to Everest) includes sublicenses solely under the applicable license rights granted to Spero or its Affiliates
by  Third  Parties  under  the  In-License  Agreements.    Any  Sublicense  with  respect  to  Know-How  or  Patents  of  a  Third  Party
hereunder and any right of Everest (if any) to grant a further sublicense thereunder, shall be subject and subordinate to the terms
and conditions of the In-License Agreement under which such sublicense is granted and shall be effective solely to the extent
permitted  under  the  terms  of  such  agreement.   Without  limitation  of  the  foregoing,  in  the  event  and  to  the  extent  that  any  In-
License Agreement requires that particular terms or conditions of such In-License Agreement be contained or incorporated in any
agreement granting a sublicense thereunder, such terms and conditions are hereby deemed to be incorporated herein by reference
and made applicable to the sublicense granted herein under such In-License Agreement.

D.

The  Parties  shall  cooperate  with  each  other  in  good  faith  to  support  each  other  in
complying with Spero’s and its Affiliates’ obligations under each In-License Agreement.  Without limitation to the foregoing, (A)
the Parties shall, from time to time, upon the reasonable request of either Party, discuss the terms of an In-License Agreement and
agree upon, to the extent reasonably possible, a consistent interpretation of the terms of such In-License Agreement in order to, as
fully as possible, allow Spero and its Affiliates to comply with the terms of such In-License Agreement; (B) to the extent there is
a  conflict  between  any  terms  of  this  Agreement  and  any  terms  of  any  In-License  Agreement  (including  with  respect  to
sublicensing rights, diligence obligations, prosecution, maintenance, enforcement, defense, any obligations for a counterparty to
such  In-License  Agreement  to  maintain  a  Party’s  information  as  confidential  and  any  obligations  for  a  Party  to  maintain  as
confidential  the  information  of  a  counterparty  to  such  In-License  Agreement),  the  terms  of  such  In-License   Agreement  shall
control  with  respect  to  the  relevant  Know-How,  Patents  or  other  rights  granted  to  Everest  hereunder;  and  (C)  Everest  and  its
Affiliates and Sublicensees shall comply with any applicable reporting and other requirements under the In-License Agreements,
and the provisions regarding currency conversion, international payments and late payments, and any other relevant definitions
and provisions, of the relevant In-License Agreements shall apply to the calculation of the payments due under the relevant In-
License Agreements.

E.

On an In-License Agreement-by-In-License Agreement basis, from and after the date on
which Everest agrees in writing pursuant to Section 3.4(b)A to accept the Patents and Know-How covered by such In-License
Agreement as Licensed Technology under this Agreement, Spero shall not enter into any subsequent agreement with any other
party  to  such  In-License  Agreement  that  modifies  or  amends  such  In-License  Agreement  in  any  way  that  would  materially
adversely  affect  Everest’s  rights  or  interest  under  this  Agreement  without  Everest’s  prior  written  consent,  which  shall  not  be
unreasonably withheld, conditioned or delayed, and shall

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

25

 
 
 
provide  Everest  with  a  copy  of  all  modifications  to  or  amendments  of  such  In-License  Agreement,  regardless  of  whether
Everest’s consent was required with respect thereto.

F.

If Everest either intends or has the opportunity to negotiate a license to, in each case in
any  jurisdiction  located  outside  the  Territory  (a)  a  claim  of  an  issued  and  unexpired  Patent  (as  may  be  extended  through
supplementary  protection  certificate  or  patent  term  extension  or  the  like)  that  has  not  been  cancelled,  revoked,  held  invalid  or
unenforceable by a decision of a patent office or other Government Authority of competent jurisdiction from which no appeal can
be taken (or from which no appeal was taken within the allowable time period) and which claim has not been disclaimed, denied
or  admitted  to  be  invalid  or  unenforceable  through  reissue,  re-examination  or  disclaimer  or  otherwise;  (b)  a  claim  of  a  Patent
application pending for no more than [***] years that has not been cancelled, withdrawn or abandoned or finally rejected by an
administrative agency action from which no appeal can be taken; or (c) any Know-How not in the public domain, in each of case
(a)  and  (b)  which  could  reasonably  be  infringed  by  Spero’s  Manufacturing,  selling  or  offering  for  sale  of  the  Compound  or  a
Licensed Product; and in the case of (c), which Know-How is reasonably necessary to Spero’s Manufacturing, selling or offering
for sale of the Compound or a Licensed Product (collectively, “Non-Territory Infringed IP”), then Everest shall promptly notify
Spero and identify the relevant Third Party’s Non-Territory Infringed IP, with a copy to the JDC, and obtain Spero’s prior written
consent before entering into a license to any such Third Party’s Non-Territory Infringed IP (a “Non-Territory License”).  The
applicable Third Party’s Non-Territory Infringed IP shall be included in the license granted by Everest to Spero under Section 3.2
(License to Spero) and considered Everest Patents and Everest Know-How, respectively, only if Everest discloses the substantive
terms of such Non-Territory License to Spero, which Everest hereby agrees to do, and Spero agrees in writing to (A) comply with
all the relevant obligations of such Non-Territory License; (B) pay [***]% of all upfront, milestone, royalty and other payments
applicable to the Development, Manufacture or Commercialization of the Compound or any Licensed Product in the Licensed
Field in the Territory; and (C) pay all upfront, milestone, royalty and other payments applicable to the Development, Manufacture
or Commercialization of the Compound or any Licensed Product in the Licensed Field outside the Territory; provided, however,
that, such upfront, milestone, royalty and other payments under clause (B) above should be (x) at fair market value for such a
license in the Territory; and (y) directly attributable to the Development, Manufacture or Commercialization of the Compound or
any Licensed Product in the Licensed Field in the Territory, or outside the Territory for use in the Territory, by Everest or any of
its  Affiliates  or  any  Sublicensees.    For  the  avoidance  of  doubt,  if  Spero  reasonably  determines  that  such  Third  Party’s  Non-
Territory  Infringed  IP  is  not  necessary  for  the  Development,  Manufacture  or  Commercialization  of  the  Compound  or  any
Licensed Product in the Licensed Field outside the Territory, Spero has the right not to pay any costs associated with such Non-
Territory  License,  in  which  case  such  Third  Party’s  Non-Territory  Infringed  IP  shall  not  be  included  in  the  license  granted  to
Spero under Section 3.2 (License to Spero) nor considered to be Everest Patents and Everest Know-How.  In the event that Spero
does  agree  to  accept  such  Non-Territory  License,  the  provisions  of  clauses  (3),  (4)  and  (5)  of  this  Section  3.4(b)  (In-License
Agreements) shall apply, mutatis, mutandis, to any such Non-Territory License

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

26

 
 
 
3.5

Initial Transfer of Know-How. Upon the written request of Everest, Spero shall commence disclosing and
making available to Everest the Licensed Know-How (including the Spero Development Data therein)  necessary  or  reasonably
required  for  Everest  to  file  a  CTA  covering  a  Licensed  Product.    Such  disclosure  and  transfer  shall  be  made  according  to  a
timeline mutually agreed by Everest and Spero, each of which shall cooperate with each other in good faith to enable a smooth
transfer of the Licensed Know-How from Spero to Everest.  Upon Everest’s reasonable request during such transfer, Spero shall
provide reasonable technical assistance, including making appropriate employees available to Everest at reasonable times, places
and frequency, and upon reasonable prior notice, for the purpose of assisting Everest to understand and use the Licensed Know-
How in connection with Everest’s filing of such CTA covering such Licensed Product.  Spero shall be responsible for only the
costs  associated  with  the  first  [***]  FTE  hours  of  activities  by  such  employees  and  advisors  under  this  Section  3.5  and  the
activities described in Section 7.2 (whether under this Agreement or the Original Agreement) and (ii) Everest shall be responsible
for any costs and expenses of any such activities under this Section 3.5 and Section 7.2 once such [***]-FTE threshold is used,
and shall pay or reimburse Spero at the Reimbursement Rate following a written invoice in reasonable detail.

3.6

No Implied Licenses; Negative Covenant.  Except as set forth herein, no Party shall acquire any license or
other intellectual property interest, by implication or otherwise, under any Know-How, Patents, trademarks or other intellectual
property rights owned or Controlled by any other Party.  Everest hereby covenants not to practice, and not to permit or cause any
of its Affiliates or any Third Party to practice, any Licensed Technology for any purpose other than as expressly authorized in this
Agreement.

3.7

Non-Diversion.  Everest hereby covenants and agrees that it will not, and will ensure that its Affiliates will
not, and will ensure its Sublicensees and subcontractors are bound by contractual obligations not to, either directly or indirectly,
promote,  market,  solicit,  distribute,  import,  sell  or  have  sold  Licensed  Products  outside  the  Territory.    In  furtherance  of  the
foregoing, Everest shall not and will ensure that its Affiliates do not, and shall use Commercially Reasonable Efforts to ensure
that its or their Sublicensees or distributors do not knowingly distribute, market, promote, offer for sale or sell the Compound or
any Licensed Product directly or indirectly to any Person outside the Territory or to any Person inside the Territory that Everest or
any  of  its  Affiliates  or  any  of  its  or  their  Sublicensees  or  distributors  knows  has  directly  or  indirectly  distributed,  marketed,
promoted,  offered  for  sale  or  sold,  or  has  reasonable  grounds  to  believe  intends  to  directly  or  indirectly  distribute,  market,
promote,  offer  for  sale  or  sell,  the  Compound  or  any  Licensed  Product  for  use  outside  the  Territory.    If  Everest  or  any  of  its
Affiliates receives or becomes aware of the receipt by it or any Sublicensee or distributor of any orders for the Compound or any
Licensed Product for use outside the Territory, such Person shall refer such orders to Spero.

3.8

Non-Compete.  During the Term of this Agreement, Everest shall not, and shall cause its Affiliates and their
respective  Sublicensees,  not  to,  directly  or  indirectly,  enable  or  assist  any  Person  that  is  not  a  Party  to  this  Agreement  to,
Develop, Manufacture or Commercialize any polymyxin-based compound, or fund any such activities, that [***] (collectively,
“Polymyxin Class Compounds”), whether alone or in combination with other compounds, for any intravenous

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

27

 
 
 
indication  in  the  Licensed  Field,  other  than  the  Compound  and  the  Licensed  Products  in  accordance  with  this  Agreement.    If
Everest  requests  a  waiver  of  this  Section  3.8  with  regard  to  a  particular  Polymyxin  Class  Compound  and/or  a  particular
transaction, Spero will in good faith give due consideration to such request.  Notwithstanding the foregoing, if Everest is acquired
by  a  Third  Party  that,  at  the  time  of  such  acquisition,  is  actively  Developing,  Manufacturing  and/or  Commercializing  any
Polymyxin Class Compounds (whether in or outside the Territory), then the activities of Everest, its Affiliates and their respective
Sublicensees under and in accordance with the terms of such license agreement and the activities of such Third Party acquirer,
respectively, shall not be deemed to breach this Section 3.8.

3.9

Subcontracting.  Subject to Section 3.3 (Sublicense Rights), Everest may subcontract on a fee-for-service
basis with a Third Party to perform any or all of its obligations hereunder (a “Subcontractor”), including by appointing one or
more distributors; provided that (a) no such permitted subcontracting shall relieve Everest of any obligation hereunder (except to
the extent satisfactorily performed by such Subcontractor) or any liability and Everest shall be and remain fully responsible and
liable therefor, (b) the agreement pursuant to which Everest engages any Subcontractor must be consistent in all material respects
with this Agreement, including terms consistent with the confidentiality, restrictions on use and intellectual property provisions of
this  Agreement,  and  (c)  Everest  shall  be  responsible  to  Spero  for  the  breach  of  this  Agreement  due  to  breach  of  any
subcontracting agreement by its Subcontractors.  Everest hereby waives any requirement that Spero exhaust any right, power or
remedy,  or  proceed  against  any  Subcontractor  for  any  obligation  or  performance  under  this  Agreement  prior  to  proceeding
directly  against  Everest.  Subject  to  Section  3.3  (Sublicense  Rights),  Spero  may  subcontract  on  a  fee-for-service  basis  with  a
Subcontractor to perform any or all of its obligations hereunder, including by appointing one or more distributors; provided that
(a) no such permitted subcontracting shall relieve Spero of any obligation hereunder (except to the extent satisfactorily performed
by  such  Subcontractor)  or  any  liability  and  Spero  shall  be  and  remain  fully  responsible  and  liable  therefor,  (b)  the  agreement
pursuant to which Spero engages any Subcontractor must be consistent in all material respects with this Agreement, including
terms consistent with the confidentiality, restrictions on use and intellectual property provisions of this Agreement, and (c) Spero
shall  be  responsible  to  Everest  for  the  breach  of  this  Agreement  due  to  breach  of  any  subcontracting  agreement  by  its
Subcontractors. Spero hereby waives any requirement that Everest exhaust any right, power or remedy, or proceed against any
Subcontractor for any obligation or performance under this Agreement prior to proceeding directly against Spero.

3.10

Statements and Compliance with Applicable Laws.    Everest  shall and shall  cause  its  Affiliates  and  its
and  their  respective  Sublicensees  to  comply  with  all  Applicable  Laws  with  respect  to  the  Exploitation  of  Licensed
Products.  Everest shall, and shall cause its Affiliates to, and shall use Commercially Reasonable Efforts to cause its and their
Sublicensees,  employees,  representatives,  agents,  and  distributors  to  avoid  taking,  or  failing  to  take,  any  actions  that  Everest
knows or reasonably should know would jeopardize the goodwill or reputation of Spero or its Affiliates or the Licensed Products
or  any  Trademark  associated  therewith.   Without  limitation  to  the  foregoing,  Everest  shall  in  all  material  respects  conform  its
practices and procedures relating to the Commercialization of the Licensed Products and educating the medical community in the
Territory with respect to the Licensed Products to any applicable industry association regulations,

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

28

 
 
 
policies and guidelines, as the same may be amended from time to time, and Applicable Laws.  Everest agrees that in performing
its  obligations  under  this  Agreement,  it  will  not  employ  or  engage  any  Person  who  has  been  debarred  or  disqualified  by  any
Regulatory Authority, or, to its knowledge, is the subject of debarment or disqualification proceedings by a Regulatory Authority.

3.11

Section 365(n).  All rights and licenses granted under or pursuant to this Agreement by Spero or Everest
are, and will otherwise be deemed to be, for the purposes of Section 365(n) of the U.S. Bankruptcy Code, and any similar law in
the Territory, licenses of rights to “intellectual property” as defined under Section 101 of the U.S. Bankruptcy Code or any similar
law in the Territory.  The Parties agree that the Parties, as licensees of such rights under this Agreement, will retain and may fully
exercise all of their rights and elections under the U.S. Bankruptcy Code or any similar law in the Territory.  The Parties further
agree that, in the event of the commencement of a bankruptcy proceeding by or against either Party under the U.S. Bankruptcy
Code or any similar law in the Territory, the Party that is not a party to such proceeding will be entitled to a complete duplicate of
(or complete access to, as appropriate) any such intellectual property and all embodiments of such intellectual property, and same,
if  not  already  in  their  possession,  will  be  promptly  delivered  to  them  (a)  upon  any  such  commencement  of  a  bankruptcy
proceeding upon their written request therefor, unless the Party subject to such proceeding elects to continue to perform all of its
obligations  under  this  Agreement,  or  (b)  if  not  delivered  under  (a)  above,  following  the  rejection  of  this  Agreement  by  or  on
behalf of the Party subject to such proceeding upon written request therefor by the non-subject party.

ARTICLE 4
GOVERNANCE

4.1

Joint  Development  Committee.    Within  [***]  days  after  the  Effective  Date,  the  Parties  shall  establish  a
joint development committee (the “Joint Development Committee” or the “JDC”), composed of [***] representatives of Spero
(if Spero elects to participate) and [***] representatives of Everest, to coordinate the Development and Commercialization of the
Compound  and  Licensed  Products  in  the  Licensed  Field  in  the  Territory.    Each  JDC  representative  shall  have  appropriate
knowledge  and  expertise  and  sufficient  seniority  within  the  applicable  Party  to  make  decisions  arising  within  the  scope  of  the
JDC’s responsibilities. For the purposes of participation in the JDC, Spero has the right but not the obligation to participate in the
JDC. The JDC shall:  

serve  as  a  forum  for  discussing  Development  of  the  Compound  and  Licensed  Products  in  the
Licensed Field in the Territory, including by reviewing the Development Plan and coordinating the conduct of the Development
activities;

(a)

serve as a forum for discussing the Commercialization of Licensed Products in the Licensed Field
in the Territory, including by reviewing the Commercialization strategy for the Territory, reviewing the Commercialization Plans
and coordinating the conduct of the Commercialization activities;

(b)

in the Licensed Field in the Territory, including by reviewing the

(c)

serve as a forum for discussing the Manufacture and supply of Compound and Licensed Products

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

29

 
 
 
Development strategy and Commercialization strategy for the Territory and coordinating the conduct of the Manufacturing and
supply activities;

(d)

serve  as  a  forum  for  discussing  and  supervising  Development  of  the  Compound  and  Licensed
Products in the  Licensed  Field in the Territory,  including  by  (i)  providing  Everest  with  a  forum  at  each  meeting  to  disclose
Everest’s, or its Affiliates’ or Sublicensees’ activities with respect to achieving Regulatory Approvals of Licensed Products in the
Territory;  material  clinical  study  results;  and  the  Marketing  Authorization  Applications  that  Everest  or  any  of  its  Affiliates
reasonably expect to make, seek or attempt to obtain in the Territory; (ii) reviewing the current Development Plan and, with the
JDC’s  approval,  making  any  amendments  or  updates  to  the  Development  Plan;  and  (iii)  coordinating  the  conduct  of  the
Development activities;

(e)

serve as a forum at each meeting for discussing and supervising the Commercialization of Licensed
Products in the Licensed Field in the Territory, including by (i) providing Everest with a forum to disclose to Everest’s, or its
Affiliates’  or  Sublicensees’  Commercialization  activities  with  respect  to  Licensed  Products  in  the  Territory;  (ii)  reviewing  the
Commercialization strategy for the Territory; (iii) reviewing the Commercialization Plan and, with the JDC’s approval, making
any  amendments  or  updates  to  the  Commercialization  Plan;  and  (iv)  coordinating  the  conduct  of  the  Commercialization
activities;

(f)

(g)

coordinate the activities of Spero and Everest under this Agreement; and

perform such other functions as are set forth herein or as the Parties may mutually agree in writing,

except where in conflict with any provision of this Agreement.

The JDC shall have only such powers as are expressly assigned to it in this Agreement, and such powers shall be subject to the
terms and conditions of this Agreement.  For clarity, the JDC shall not have any right, power or authority: (i) to determine any
issue in a manner that would conflict with the express terms and conditions of this Agreement; or (ii) to modify or amend the
terms and conditions of this Agreement.

4.2

JDC Membership and Meetings.

(a)

JDC  Members.    Spero’s  initial  JDC  representatives  will  be  [***]  and  Everest’s  initial  JDC
representatives  will  be  [***].    The  chairmanship  for  each  meeting  shall  rotate  between  Spero  and  Everest,  with  one  of  each
Party’s JDC representatives acting as chairperson of the JDC on a rotating basis. Each Party may replace its JDC representatives
on written notice to the other Party, but each Party shall strive to maintain continuity.  The JDC members shall jointly prepare and
circulate the meeting agenda at least [***] Business Days in advance of each meeting, and shall also promptly, but in no event
later than [***] days after such meeting, prepare and circulate for review and approval of the Parties the minutes of such meeting.

JDC Meetings.  The JDC will hold its first meeting within [***] days of establishment of the JDC
pursuant  to  Section  4.1  (Joint  Development  Committee).    At  this  first  meeting,  the  JDC  will  address  the  initial  transfer  of
Licensed Know-How provided for in Section

(b)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

30

 
 
 
3.5 (Initial Transfer of Know-How) and any other topics the Parties deem appropriate.  Thereafter, the JDC shall hold meetings at
such  times  as  it  elects  to  do  so,  but  in  no  event  shall  such  meetings  be  held  less  frequently  than  [***]  per  Calendar
Year.  Meetings may be held in person, or by audio or video teleconference; provided, that unless otherwise agreed by Spero and
Everest, at least [***] meeting per year shall be held in person, and all in-person JDC meetings shall be held at locations mutually
agreed upon by Spero and Everest.  Each Party shall be responsible for all of its own expenses of participating in JDC meetings.

(c)

Non-Member Attendance.  Each of Spero and Everest may from time to time invite a reasonable
number of participants, in addition to its representatives, to attend JDC meetings in a non‑voting capacity; provided, that if either
Spero or Everest intends to have any Third Party (including any consultant) attend such a meeting, such Party shall provide at
least [***] days prior written notice to the other Party and obtain the other Party’s approval for such Third Party to attend such
meeting, which approval shall not be unreasonably withheld or delayed.  Such Party shall ensure that such Third Party is bound
by confidentiality and non-use obligations consistent with the terms of this Agreement, and provide the other Party with a copy of
such confidentiality agreement.  The Party inviting any such Third Party shall be responsible for all of such Third Party’s costs
and expenses of participating in JDC meetings, unless such invitation is mutually made by Spero and Everest, in which case they
shall equally share such costs and expenses.

4.3

JDC  Decision-Making.  All  decisions  of  the  JDC  shall  be  made  by  unanimous  vote,  with  Spero’s
representatives and Everest’s representatives each collectively having [***] vote.  If after reasonable discussion and good faith
consideration of each of their views on a particular matter before the JDC, the representatives of Spero and Everest cannot reach
an  agreement  as  to  such  matter  within  [***]  Business  Days  after  such  matter  was  brought  to  the  JDC  for  resolution,  such
disagreement shall:

(a)

be referred to the Chief Executive Officer of Spero (or his or her designee) and the Chief Executive
Officer of Everest (or his or her designee) (collectively, the “Executive Officers”) for resolution, who shall use good faith efforts
to resolve such matter within [***] Business Days after it is referred to them and, if such matter is resolved by the Executive
Officers, such resolution shall be implemented by and binding on the Parties.

(b)

If  the  Executive  Officers  are  unable  to  reach  consensus  on  any  such  matter  during  such  [***]
Business Day period, then (i) the Chief Executive Officer of Everest shall have the right to make the final decision if such matter
(A)  involves  the  Development  of,  Regulatory  Approval  for,  Commercialization  or  other  Exploitation  of  the  Compound  or  a
Licensed Product solely in the Territory and (B) does not involve Spero’s Retained Rights and could not reasonably be expected
to  have  a  material  adverse  effect  on  the  Development  of,  Regulatory  Approval  for,  Commercialization  or  Exploitation  of  the
Compound or a Licensed Product outside the Territory; (ii) the Chief Executive Officer of Spero shall have the right to make the
final  decision  if  such  matter  either  (A)  involves  the  Development  of,  Regulatory  Approval  for,  Commercialization  or  other
Exploitation of the Compound or a Licensed Product solely outside the Territory, or Spero’s Retained Rights, or (B) involves the
Development of, Regulatory Approval for, or Commercialization or other Exploitation of the Compound or a Licensed Product in
the Territory

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

31

 
 
 
but  could  reasonably  be  expected  to  have  a  material  adverse  effect  on  the  Development  of,  Regulatory  Approval  for,  or
Commercialization or Exploitation of the Compound or a Licensed Product outside the Territory; or (iii) in all other cases, such
matter will be resolved in accordance with Section 15.10 (Dispute Resolution).

If Spero does not participate in establishing the JDC or appoint members to the JDC, Everest shall
have the votes and the decision-making power of Spero with respect to the JDC unless and until Spero appoints members to the
JDC.  

(c)

ARTICLE 5
DEVELOPMENT

5.1

General.  Subject to the terms and conditions of this Agreement (including without limitation the Retained
Rights), Everest shall be solely responsible for the Development of the Compound and Licensed Products in the Licensed Field in
the  Territory,  including  the  performance  of  preclinical  and  clinical  studies  of  any  Compound  or  any  Licensed  Product  in  the
Licensed Field in the Territory, all in accordance with the Development Plan.

5.2

Development Plan.  Everest shall conduct all Development of the Compound and Licensed Products in the
Licensed Field in the Territory in accordance with a comprehensive development plan, the initial version of which is attached to
this  Agreement  as  Exhibit  E  (the  “Initial  Development  Plan”),  and  as  amended  from  time  to  time  in  accordance  with  this
Agreement,  the  “Development  Plan”).  The  Development  Plan  will  include,  among  other  things,  the  indications  for  which  a
Licensed Product is to be Developed and other exploratory indications for which a Licensed Product may be developed, critical
activities  to  be  undertaken,  certain  timelines,  go/no  go  decision  points  and  relevant  decision  criteria  and  certain  allocations  of
responsibilities between the Parties for the various activities to be undertaken under the Development Plan.  The Development
Plan will be focused on efficiently obtaining Regulatory Approval for a Licensed Product in the Licensed Field in the Territory
while taking into consideration Development, Regulatory Approval, or commercial impacts on the Licensed Product outside the
Licensed Field and Territory.  From time to time, but at least [***] per Calendar Year, the Parties will, with the assistance of the
JDC, update the Development Plan and submit such updated plan to the JDC for review, discussion, and approval.  The then-
current Development Plan will at all times contain at least that level of detail and cover at least the same matters (to the extent
applicable) as the Initial Development Plan.  If any updated Development Plan is not approved by the JDC, any disagreement or
dispute shall be resolved by the JDC in the manner set forth in Section 4.3 (JDC Decision-Making).  If any updated or new terms
of the Development Plan contradict, or create inconsistencies or ambiguities with, the terms of this Agreement, then the terms of
this Agreement shall govern.

5.3

Diligence.  

Commercially  Reasonable  Efforts.    Everest,  directly  and/or  with  or  through  its  Affiliates  or
Sublicensees, shall use Commercially Reasonable Efforts to Develop, Exploit, Commercialize and obtain Regulatory Approval
for the Compound and each Licensed

(a)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

32

 
 
 
Product in the Licensed Field in the Territory in accordance with the Development Plan and the Commercialization Plan.

(b)

Specific  Diligence  Events.  In  furtherance  of  Section  5.3(a)  (Commercially  Reasonable  Efforts)
and without limitation thereof, Everest shall use Commercially Reasonable Efforts to achieve, by itself or through its Affiliates or
Sublicensees, the following diligence milestones (each, a “Diligence Milestone”) with respect to the Compound and a Licensed
Product in each case on or prior to the applicable target date (the “Diligence Target Dates”):

Date;

after the Effective Date; and

after the Effective Date.

A.

B.

C.

File a CTA in the Territory for a Licensed Product within [***] years after the Effective

Initiate a Phase 3 Clinical Trial in the Territory for a Licensed Product within [***] years

First filing of an NDA covering a Licensed Product in Mainland China within [***] years

If Everest reasonably believes that it will not achieve a Diligence Milestone on or prior to the applicable Diligence Target Date,
Everest shall notify Spero in writing as far in advance of the applicable Diligence Target Date as reasonably practicable (a “First
Diligence  Notice”),  which  First  Diligence  Notice  shall  address  the  reasons  for  not  timely  achieving  the  relevant  Diligence
Milestone (including whether there is any reason constituting a “force majeure” as described in Section 15.6 (Force Majeure), the
efforts Everest is continuing to expend toward meeting such Diligence Milestone and suggesting a reasonable extension to such
Diligence Target Date for achieving such Diligence Milestone. Within thirty [***] following receipt of a First Diligence Notice,
Spero may inform Everest in writing that either (i) Spero accepts the provisions of such First Diligence Notice (which Spero shall
do in the event that the delay is attributable to a reason of “force majeure”), in which case the Parties agree to promptly amend
this Section 5.3(b) (Specific Diligence Events) to incorporate a new mutually agreed Diligence Target Date or (ii) Spero desires
to  have  further  discussions  with  Everest  concerning  such  Diligence  Milestone  and  the  efforts  of  Everest  to  achieve  such
Diligence  Milestone,  in  which  case,  within  [***]  Business  Days  following  receipt  of  such  notice  from  Spero,  the  Executive
Officers  of  each  Party  shall  set  a  date  within  the  following  [***]  days  (the  “Diligence  Meeting  Date”)  for  a  meeting  (a
“Diligence Meeting”), at which Diligence Meeting each Party shall present its views concerning, and evidence (if applicable) as
to,  whether  Everest  has  used  and  will  continue  to  use  Commercially  Reasonable  Efforts  to  achieve  such  Diligence  Milestone,
together  with  any  other  relevant  information.    If  the  Parties  are  able  reach  agreement  at  such  Diligence  Meeting  as  to
modifications  to  this  Section  5.3(b)  (Specific  Diligence  Events),  then  the  Parties  shall  promptly  amend  this  Agreement
accordingly.    If  the  Parties  are  unable  to  reach  agreement  at  such  Diligence  Meeting,  then  Everest  shall  have  [***]  days  to
achieve  such  Diligence  Milestone  or  to  demonstrate,  to  the  reasonable  satisfaction  of  Spero,  that  it  has  continually  used
Commercially Reasonable Efforts to achieve such Diligence Milestone. If, following such [***] day period, Everest has still not
achieved  such  Diligence  Milestone  or  demonstrated,  to  the  reasonable  satisfaction  of  Spero,  that  it  has  continually  used
Commercially Reasonable Efforts to achieve such Diligence Milestone,

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

33

 
 
 
then, in addition to any other rights or remedies available to Spero, Spero may initiate termination of this Agreement pursuant to
Section 12.2(b) (Termination for Cause) of this Agreement.

5.4

Development Costs.  

As between the Parties, Everest shall be solely responsible for the cost for the Development of the
Compound and the Licensed Products in the Licensed Field in the Territory and Spero shall be solely responsible for the cost for
the Development of the Compound and the Licensed Products in the Licensed Field outside the Territory.

(a)

(b)

If Spero (or its (sub)licensee) and Everest cooperate on any multi-regional clinical trial conducted
both inside and outside the Territory, then Everest shall (i) be responsible for all direct costs and expenses of conducting such
clinical  trial  in  the  Territory  and  (ii)  pay  or  reimburse  Spero  for  a  pro  rata  portion  of  all  of  the  Indirect  Costs  of  such  multi-
regional clinical trial, not to exceed [***] percent ([***]%) of the total Indirect Costs of such multi-regional clinical trial. For
clarity,  this  subsection  (b)  shall  not  apply  to  the  initial  Milestone  Event,  [***],  which  shall  be  reimbursed  through  Everest’s
payment of the corresponding Milestone Payment.

(c)

If, at the request of Spero (or its (sub)licensee), Everest agrees to assist Spero (or its (sub)licensee)
in Development beyond the scope of Everest’s obligations under this Agreement (for example, Development outside the Territory
or  Development in  the  Territory  for  a  multi-regional  clinical  trial  for  an  indication of the Licensed Product that Everest is not
interested in Developing in the Territory), then Spero shall pay or reimburse Everest all costs and expenses for such assistance,
including Everest’s employee costs at the Reimbursement Rate and Third Party expenses as actually incurred.  

5.5

Development Records and Report.

(a)

Everest  shall,  and  shall  cause  its  Affiliates  and  its  and  their  Sublicensees  to,  maintain,  in  good
scientific  manner,  complete  and  accurate  books  and  records  pertaining  to  Development  of  Licensed  Products  hereunder,  in
sufficient detail for Spero to verify Everest’s compliance with its obligations under this Agreement.  Such books and records shall
(i)  be  summarized  in  English  in  sufficient  detail  for  Spero  to  verify  Everest’s  compliance  with  its  obligations  under  this
Agreement and for Spero to properly use such books and records for patent and regulatory purposes, (ii) be appropriate for patent
and regulatory purposes; (iii) be in compliance with Applicable Laws; (iv) properly reflect all work done and results achieved in
the performance of its Development activities hereunder; (v) record only such activities and not include or be commingled with
records  of  activities  outside  the  scope  of  this  Agreement;  and  (vi)  be  retained  by  Everest  for  at  least  [***]  years  after  the
expiration or termination of this Agreement in its entirety or for such longer period as may be required by Applicable Laws.

(b)

On [***] of each year starting from the year of [***], each of Everest and Spero shall provide the
other Party with a written report summarizing in sufficient detail for Spero to verify Everest’s compliance with its obligations
under  this  Agreement  (i)  the  Development  activities  conducted  in  the  preceding  Calendar  Year  by  it  and  its  Affiliates  and
Sublicensees, and (ii) the Development activities planned to be conducted in such Calendar Year by it and its

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

34

 
 
 
Affiliates and Sublicensees.    If  at  any  time  a  Party’s  representatives  on  the  JDC  are  not  fully  able  to  perform  their  rights  and
duties on the JDC in the absence of a review of any of such books and records, the other Party shall, upon reasonable written
request from such JDC representative, provide a copy of such records to the JDC.

ARTICLE 6
REGULATORY

6.1

Regulatory Responsibilities.  Everest shall be responsible, at its cost and subject to the Retained Rights and
except  as  set  forth  in  this  ARTICLE  6,  for  all  regulatory  activities  necessary  to  prepare,  obtain  and  maintain  Marketing
Authorization Applications, Regulatory Filings and other Regulatory Approvals for the Compound and Licensed Products in the
Licensed  Field  in  the  Territory.    Everest  shall  keep  Spero  informed  of  regulatory  developments  related  to  the  Compound  and
Licensed Products in the Licensed Field in the Territory via the JDC.

6.2

Regulatory Reports.  On [***] of each year starting from the year of [***], each of Everest and Spero shall
provide  the  other  Party  with  a  written  report  summarizing  the  clinical  data  and  safety  results  generated  from  the  regulatory
activities  performed  in  the  preceding  Calendar  Year  by  it  and  its  Affiliates  and  Sublicensees,  in  sufficient  detail  for  Spero  to
verify Everest’s compliance with its obligations under this Agreement and for Spero to properly use data and results for patent
and regulatory purposes.

6.3

Regulatory Cooperation.

(a)

Everest.    Everest  shall  notify  Spero  of  all  material  Regulatory  Documentation  submitted  or
received by Everest or its Affiliates or Sublicensees that are related to any Licensed Product in the Territory reasonably prior to
such submission or reasonably after receipt.  Moreover, with respect to Regulatory Filings in the Territory, Everest will provide
Spero with (i) an English summary of such draft filings and (ii) an English translation of that portion of the draft filings newly
developed and prepared by Everest reasonably prior to submission so that Spero may have sufficient opportunity to review and
comment  on  them.    Everest  shall  consider  all  comments  of  Spero  in  good  faith,  taking  into  account  the  best  interests  of  the
Development,  Regulatory  Approval  and/or  Commercialization  of  the  Licensed  Product,  but  has  no  obligation  to  accept  any
comments of Spero, except to the extent that ignoring such comment could reasonably be expected to have a material adverse
effect on the Development of, Regulatory Approval for, or Commercialization or Exploitation of the Compound or a Licensed
Product outside the Territory, or on Spero’s Retained Rights.  Material submissions made by Everest to, or correspondence with,
Regulatory Authorities will be provided to Spero sufficiently in advance to enable translation by Spero, if any such submissions
or correspondence are not available in English.  Spero shall not provide any Regulatory Documentation of Everest, its Affiliates,
or Sublicensees to any of Spero’s (sub)licensees who does not agree pursuant to Section 6.3(b) (Spero) to permit its Regulatory
Documentation to be shared with Everest, its Affiliates, and its Sublicensees.

Spero.    Spero  shall  provide  or  make  available  to  Everest  copies  of  all  material  Regulatory
Documentation  submitted  or  received  by  Spero  or  its  Affiliates  that  are  related  to  any  Licensed  Product  outside  the  Territory
reasonably after such submission or receipt. Spero

(b)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

35

 
 
 
shall use Commercially Reasonable Efforts to negotiate an agreement with each (sub)licensee to make available to Everest copies
of all material Regulatory Documentation that are related to any Licensed Product outside the Territory that are Controlled by its
such (sub)licensee.  

Confidentiality.  Any information of a Party to which the other Party obtains access pursuant to
this  Section  6.3  (Regulatory  Cooperation)  shall,  subject  to  ARTICLE  11  (Confidentiality;  Publication),  be  deemed  the
Confidential Information of such first Party.

(c)

(d)

Discontinuation.      In  the  event  that  Everest  (including  its  Affiliates  and  their  respective
Sublicensees)  discontinues  Development  or  Commercialization  of  any  Licensed  Product  in  the  Territory,  then  (1)  the  license
of  Licensed Technology to Everest under Section 3.1 (License to Everest) as to such Licensed Product shall be terminated; (2)
Everest  shall,  at  its  expense,  return  all  Spero  Development  Data  and  Spero  Regulatory  Documentation  to  Spero,  as  well  as
transfer  to  Spero  any  Everest  Development  Data  and  Everest  Regulatory  Documentation  related  to  the  discontinued  Licensed
Product; (3) the provisions of Section 2.1(e) shall apply with respect to any Assigned Patent covering such Licensed Product that
Everest intends to abandon; and (4) subject to Section 2.1(e), with respect to any Everest Technology, Everest Development Data,
and Everest Regulatory Documentation covering such discontinued Licensed Product, Everest shall grant a license to Spero and
the provisions of Section 12.3(f) shall apply mutatis mutandis.

6.4

Rights of Reference.  Solely to the extent Regulatory Authorities in the applicable jurisdiction are permitted

under Applicable Laws to utilize Regulatory Documentation submitted to Regulatory Authorities outside of the Territory:

(a)

Without any additional consideration to Spero, Spero hereby grants to Everest and its Sublicensees
a Right of Reference and Use, as that term is defined in 21 C.F.R. § 314.3(b) and any foreign counterpart to such regulation, to all
Spero Regulatory Documentation and the Spero Development Data to the extent necessary or reasonably useful for Everest (or
such  Sublicensee)  to  Develop,  Manufacture,  obtain  Regulatory  Approval  of,  or  Commercialize  the  Compound  or  Licensed
Products in the Licensed Field in the Territory, in each case, pursuant to the Development Plan or Commercialization Plan and
otherwise subject to the terms and conditions of this Agreement.

(b)

Without any additional consideration to Everest, Everest hereby grants to Spero and its Affiliates,
and any current or future direct or indirect (sub)licensee of Spero with respect to the Compound or a Licensed Product, a Right of
Reference and Use, as that term is defined in 21 C.F.R. § 314.3(b) and any foreign counterpart to such regulation, to the Everest
Development Data to the extent (i) necessary or reasonably useful for Spero (or such Affiliate or (sub)licensee) to Exploit the
Compound, Licensed Product(s) or any product containing the Compound outside of the Territory, or (ii) in support of Spero’s (or
such Affiliate’s or (sub)licensee’s) Development, Manufacturing, Regulatory Approval, or Commercialization of the Compound,
Licensed Product(s) or any product containing the Compound outside of the Territory.

Development Data, Everest shall provide Spero with copies of such Everest

(c)

Promptly  after  Everest,  its  Affiliate  or  its  or  their  Sublicensees  generate(s)  any  Everest

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

36

 
 
 
Development Data and Everest hereby grants to Spero an exclusive (even as to Everest), royalty-free license under and to such
Everest Development Data solely to Exploit Licensed Products in the Licensed Field outside the Territory, with the right to grant
sublicenses to such Everest Development Data independent of the requirements of Section 3.3 (Sublicense Rights); provided that,
(i) each sublicense under Everest Development Data granted by Spero to a Third Party shall be in writing, and shall incorporate
terms and conditions that are consistent with, and expressly made subject to, the terms and conditions of this Agreement, and (ii)
Spero shall be responsible to Everest for a breach of this Agreement due to the breach by such Third Party of such sublicense
agreement.  Spero  hereby  waives  any  requirement  that  Everest  exhaust  any  right,  power  or  remedy,  or  proceed  against  any
sublicensee of Everest Development Data prior to proceeding directly against Spero. Pursuant to Section 3.3 (Sublicense Rights)
and  Section  3.9  (Subcontracting),  Everest  shall  ensure  that  any  sublicense  agreement  or  subcontract  agreement  contains
provisions that require Everest’s current or future Sublicensees or subcontractors that generate any Regulatory Documentation or
any development data (to the extent that it is not Everest Regulatory Documentation or Everest Development Data) in relation to
the  Development,  Manufacture,  Commercialize  and  Exploitation  of  Licensed  Products  arising  from  the  performance  of  the
relevant sublicense agreement or subcontract agreement relating to the Compound  or  a  Licensed  Product  to  make  available  to
Spero (and its Affiliates and (sub)licensees) copies of all such Regulatory Documentation or development data solely for Spero to
Develop, Manufacture, Commercialize and otherwise Exploit Licensed Products outside the Territory.

Each Party will provide a signed statement to this effect, if requested by the other Party (or such
Party’s Affiliate, Sublicensee or (sub)licensee), 21 C.F.R. § 314.50(g)(3) or any foreign counterpart to such regulation, in the case
of a request by either Party, for the limited purpose described in this Section 6.4 (Rights of Reference).

(d)

6.4 shall require either Party to take, or forbear to take, any action.

(e)

Other than as expressly set forth in this Section 6.4 (Rights of Reference), nothing in this Section

(f)

Any  information  of  a  Party  to  which  the  other  Party  obtains  access  pursuant  to  this  Section  6.4
(Rights  of  Reference)  shall,  subject  to  Sections  11.1  (Duty  of  Confidence)  and  11.2  (Exceptions),  be  deemed  the  Confidential
Information  of  such  first  Party.  For  avoidance  of  doubt,  a  Party’s  submission  of  information  of  the  other  Party  to  which  such
Party  obtains  access  pursuant  to  this  Section  6.4  (Rights  of  Reference)  to  a  Regulatory  Authority  shall  be  governed  by  and
subject to the terms of ARTICLE 11 (Confidentiality; Publication).

6.5

Recalls, Suspensions or Withdrawals.  Everest shall notify Spero promptly following its determination that
any  event,  incident  or  circumstance  has  occurred  that  would  reasonably  be  expected  to  result  in  the  need  for  a  recall,  market
suspension or market withdrawal of a Licensed Product in the Licensed Field in the Territory and shall include in such notice the
reasoning behind such determination and any supporting facts.  As between the Parties, Everest shall have the right to make the
final determination whether to voluntarily implement any such recall, market suspension or market withdrawal in the Licensed
Field  in  the  Territory;  provided  that  prior  to  any  implementation  of  such  a  recall,  market  suspension  or  market  withdrawal,
Everest  shall  consult  with  Spero  and  shall  consider  Spero’s  comments  in  good  faith.    If  a  recall,  market  suspension  or  market
withdrawal is mandated by a Regulatory Authority in the Territory, as

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

37

 
 
 
between the Parties, Everest shall initiate such a recall, market suspension or market withdrawal in compliance with Applicable
Laws.  For all recalls, market suspensions or market withdrawals undertaken pursuant to this Section 6.5 (Recalls, Suspensions or
Withdrawals),  as  between  the  Parties,  Everest  shall  be  solely  responsible  for  the  execution  thereof.    Subject  to  ARTICLE  14
(Indemnification;  Liability),  Everest  shall  be  responsible  for  all  costs  and  expenses  of  any  such  recall,  market  suspension  or
market withdrawal.

6.6

Pharmacovigilance Agreement; Global Safety Database.  The Parties shall enter into a pharmacovigilance
agreement at least [***] days prior to the initiation of Phase 1 Clinical Trial by Everest in the Territory providing for the terms
pursuant to which (i) Spero shall establish, hold and maintain (at Spero’s sole cost and expense) the global safety database for
Licensed  Products  and  (ii)  Everest  shall  timely  provide  Spero  with  information  in  the  possession  and  Control  of  Everest  as
necessary  for  Spero  to  comply  with  its  pharmacovigilance  responsibilities  outside  the  Territory,  including,  as  applicable,  any
adverse  drug  experiences  (including  those  events  or  experiences  that  are  required  to  be  reported  to  the  FDA  under  21  C.F.R.
sections 312.32 or 314.80 or to foreign Regulatory Authorities under corresponding Applicable Laws outside the United States),
from pre-clinical or clinical laboratory, animal toxicology and pharmacology studies, clinical studies and commercial experiences
with  a  Licensed  Product,  in  each  case,  in  English,  in  the  form  reasonably  requested  by  Spero  and  at  Everest’s  sole  cost  and
expense.

6.7

Regulatory Inspections.  If any Regulatory Authority (i) contacts Everest, its Affiliates or their respective
Sublicensees with respect to the alleged improper Development, Manufacture or Commercialization of any Licensed Product; (ii)
conducts, or gives notice of its intent to conduct, an inspection at Everest’s, its Affiliate’s  or Sublicensee’s facilities used in the
Development or Manufacturing of Licensed Products or (iii) takes, or gives notice of its intent to take, any other regulatory action
with respect to any activity of Everest, its Affiliates or Sublicensees that could reasonably be expected to materially adversely
affect any Development, Manufacture or Commercialization activities with respect to the Licensed Product, whether in or outside
the Territory, then Everest will promptly notify Spero of such contact, inspection or notice.

ARTICLE 7
SUPPLY; MANUFACTURING

7.1

Supply Agreement.  

(a)

Initial Supply Agreement.  Spero and Everest agree to negotiate in good faith within [***] days
after  the  Effective  Date  a  new  agreement  concerning  the  short-term  supply  of  the  Compound  for  Everest’s  Development  use
(including  preclinical  (e.g.,  MIC  testing)  and/or  clinical  use)  (the  “Initial  Supply  Agreement”),  with  Everest’s  cost  of  the
Compound under the Initial Supply Agreement being equal to [***].  Everest shall provide written notice to Spero with rolling
initiating  pre-clinical  experiments  or  clinical
forecasts 
trials.    Notwithstanding  the  foregoing,  nothing  in  this  Agreement  nor  the  Initial  Supply  Agreement  shall  restrict,  impair  or
otherwise limit Spero’s ability to manufacture the Compound or Licensed Products in the Territory for use outside the Territory.

least  quarterly)  promptly 

its  decision  on 

following 

(at 

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

38

 
 
 
(b)

Commercial  Supply  Agreement.  Everest  and  Spero  acknowledge  and  agree  that,  upon
Completion, (i) Spero shall be no longer required to negotiate an new agreement concerning the supply of the Compound and/or
the Licensed Product for Everest’s Commercialization use (the “Commercial Supply Agreement”); and (ii) all the terms of the
Original License associated with the Commercial Supply Agreement shall cease to have effect.

7.2

Manufacturing Technology Transfer.  Everest and Spero acknowledge that, in order to enable Everest to
Manufacture  or  have  Manufactured  the  Compound  and  Licensed  Products  consistent  with  the  terms  of  Section  7.3
(Manufacturing Responsibilities), upon a written request from Everest dated [***], Spero has commenced the technology transfer
to  Everest  as  follows:    during  a  mutually  agreed  time  period  of  no  more  than  [***]  days  (the  “Manufacturing  Transfer
Period”), Spero shall (a) make available and transfer to Everest, copies of existing embodiments of the Licensed Know-How in
Spero’s possession that are necessary or reasonably useful in the Manufacture of the Compound and Licensed Products and as of
such date are being used by Spero to Manufacture the Compound and Licensed Products (the “Licensed Manufacturing Know-
How”) solely for Everest and/or its Subcontractor to Manufacture the Compound and Licensed Products in accordance with the
terms  and  conditions  of  this  Agreement;  (b)  identify  in  writing  all  Subcontractors  who  Manufacture  Compounds  or  Licensed
Products for Spero (each, an “Spero CMO”); and (c) provide technical assistance (both on site and otherwise) in the transfer and
demonstration  of  the  Licensed  Manufacturing  Know-How  that  is  necessary  to  Manufacture  the  Compound  and  Licensed
Products.   To  the  extent  that  any  Licensed  Manufacturing  Know-How  is  in  the  Control  of  Spero  but  is  in  the  possession  of  a
Spero CMO (and is not in Spero’s possession), then during the Manufacturing Transfer Period, upon Everest’s request, Spero will
use  Commercially  Reasonable  Efforts  to  facilitate  the  transfer  of  such  Licensed  Manufacturing  Know-How  from  such  Spero
CMO  to  Everest,  and/or  cause  such  Spero  CMO  to  make  such  Licensed  Manufacturing  Know-How  available  to  Everest,  at
Everest’s  cost.    Everest,  in  its  sole  discretion  and  at  its  sole  expense,  may  contract  with  any  such  Spero  CMO  for  technical
assistance  (both  on  site  and  otherwise)  in  the  transfer  and  demonstration  of  the  Licensed  Manufacturing  Know-How  that  is
necessary  to  Manufacture  the  Compound  and  Licensed  Products.    After  the  Manufacturing  Transfer  Period,  if  requested  by
Everest, Spero will in good faith endeavor to provide additional technical assistance in the transfer of Licensed Manufacturing
Know-How to Everest.  For all activities or assistance provided from and after the Effective Date under the Original Agreement
or  this  Agreement  by  Spero  employees  or  advisors  to  Everest  under  this  Section  7.2  or  under  Section  3.5,  (i)  Spero  shall  be
responsible  for  only  the  costs  associated  with  the  first  [***]  FTE  hours  of  activities  by  such  employees  and  advisors  and  (ii)
Everest shall be responsible for the costs and expenses of any such activities under this Section 7.2 and Section 3.5 once such
[***]-FTE  threshold  is  used,  and  shall  pay  or  reimburse  Spero  at  the  Reimbursement  Rate  following  a  written  invoice  in
reasonable detail.

7.3

Manufacturing Responsibilities.  Everest shall have the right to Manufacture the Compound and Licensed
Products inside the Territory, or outside the Territory but solely for Development and Commercialization of the Compound in the
Territory under this Agreement, at its sole expense.  Everest may conduct such manufacturing activities itself, through a Spero
CMO, or through another Subcontractor subject to Section 3.9 (Subcontracting).  Upon request from Everest, Spero will arrange
for any Spero CMO to discuss the Manufacture and supply of the

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

39

 
 
 
Compound  and/or  Licensed  Products  for  Everest.    If,  at  any  time,  Everest  elects  to  Manufacture  the  Compound  or  Licensed
Products  itself  or  to  use  a  Subcontractor  (including  a  Spero  CMO),  then  Everest  will  use  product  and  manufacturing
specifications and impose quality controls and assurances on itself or on such Spero CMO or such Subcontractor that are at least
as stringent as those used required by Spero of its Spero CMOs and are reasonably acceptable to Spero.  Everest may also request
that an Spero CMO Manufacture the Compound and/or Licensed Products required by Everest for preclinical and clinical use in
the  Territory  under  this  Agreement,  Manufactured  under  product  and  manufacturing  specifications  and  quality  controls  and
assurances  that  are  at  least  as  stringent  as  those  used  required  by  Spero  with  such  Spero  CMO.    If  Everest,  its  Affiliates,
Sublicensees Manufacture, or use a Subcontractor or CMO (including a Spero CMO) that Manufactures, a batch of API or drug
product that does not meet such specifications, Everest shall promptly notify the JDC, and will provide any relevant materials to
the JDC, for discussion at the next JDC meeting.

7.4

Manufacturing Reports.    On  [***]  of  each  year  following  Everest’s  Manufacturing  of  the  Compound  or
Licensed Products, Everest shall provide Spero with a written report summarizing in sufficient detail for Spero to verify Everest’s
compliance with its obligations under this Agreement, the API and drug product manufacturing processes being used by Everest,
its Affiliates or Sublicensee, including product and manufacturing specifications, quality controls and assurances, test methods
and raw material information.

7.5

Quality.  The Parties agree that, following the Effective Date, they shall negotiate and enter into a separate

Manufacturing Quality Agreement.

ARTICLE 8 
COMMERCIALIZATION

8.1

General.  Subject to the terms and conditions of this Agreement and the Commercialization Plan, Everest
shall  be  responsible  for  all  aspects  of  the  Commercialization  of  the  Licensed  Products  in  the  Licensed  Field  in  the  Territory,
including: (a) developing and executing a commercial launch and pre-launch plan, (b) negotiating with applicable Government
Authorities  regarding  the  price  and  reimbursement  status  of  the  Licensed  Products  and  obtaining  and  maintaining  Pricing
Approvals; (c) marketing, medical affairs, and promotion; (d) booking sales and distribution and performance of related services;
(e)  subject  to  the  provisions  of  Section  6.5  (Recalls,  Suspensions  or  Withdrawals)  handling  all  aspects  of  order  processing,
invoicing  and  collection,  inventory  and  receivables;  (f)  providing  customer  support,  including  handling  medical  queries,  and
performing other related functions; and (g) conforming its practices and procedures to Applicable Laws relating to the marketing,
detailing  and  promotion  of  Licensed  Products  in  the  Licensed  Field  in  the  Territory.   As  between  the  Parties,  Everest  shall  be
solely  responsible  for  the  costs  and  expenses  of  Commercialization  of  the  Licensed  Products  in  the  Licensed  Field  in  the
Territory.

8.2

Commercialization  Plan.    Everest  shall  conduct  all  Commercialization  of  Compounds  and  Licensed
Products in the Licensed Field in the Territory in accordance with a comprehensive commercialization plan (as amended from
time  to  time  in  accordance  with  this  Agreement,  the  “Commercialization  Plan”),  the  initial  version  of  which  Everest  will
prepare and

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

40

 
 
 
provide to the JDC no later than [***] prior to the anticipated First Commercial Sale of Licensed Product in the Licensed Field in
the Territory and which initial Commercialization Plan shall be subject to the review (but not approval) of the Parties through the
JDC. From time to time, but at least [***] every Calendar Year, Everest will update the Commercialization Plan and submit such
updated  plan  to  the  JDC  for  review  and  discussion.  If  any  updated  Commercialization  Plan  omits  details  that  a  Spero
representative reasonably  believes  is  necessary  for  (i)  the  proper  functioning  of the JDC or (ii)  to  verify  Everest’s  compliance
with its obligations under this Agreement, then Everest shall take into reasonable consideration such comments and, if necessary,
further  update  such  Commercialize  Plan.    If  the  terms  of  the  Commercialization  Plan  contradict,  or  create  inconsistencies  or
ambiguities with, the terms of this Agreement, then the terms of this Agreement shall govern.

8.3

Commercial Diligence.  Upon Regulatory Approval of a Licensed Product in a jurisdiction in the Territory,
Everest, directly and/or with or through Affiliates or Sublicensees, shall use Commercially Reasonable Efforts to Commercialize
such Licensed Product in the Licensed Field in such jurisdiction.

ARTICLE 9
FINANCIAL PROVISIONS

9.1

Upfront  Payment.    Everest  and  Spero  acknowledge  that  (i)  Everest  has  paid  to  NPLH  a  one-time,  non-
refundable and non-creditable upfront payment of two million Dollars ($2,000,000) as required under the Original License, and
(ii) Everest has [***] pursuant to the other provisions under this ARTICLE 9.

9.2

Development and Regulatory Milestone Payments.  As additional consideration of the rights granted by
Spero to Everest hereunder, within [***] calendar days after the first achievement of each milestone event below (a “Milestone
Event”) by or on behalf of Everest or any of its Affiliates or Sublicensees or by Spero or any of its Affiliates or sublicensees, the
Party achieving such Milestone Event or whose Affiliate or Sublicensee/sublicensee achieved such Milestone Event shall notify
the  other  Party  of  the  achievement  of  such  Milestone  Event.    Milestone  Events  related  to  a  Licensed  Product  trigger  the
corresponding milestone payment due to Spero (a “Milestone Payment”) and Spero shall invoice Everest for the applicable non-
refundable, non-creditable Milestone Payment corresponding to such Milestone Event as shown

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

41

 
 
 
below, and Everest shall remit payment within [***] Business Days of the receipt of such invoice, as described in Section  9.6
(Currency; Exchange Rate; Payments).

Development and Regulatory Milestone Events for
Licensed Products

Milestone Payments (in U.S.
Dollars)

[***]

[***]

[***]

[***]

[***]

[***]

[***]

[***]

[***]

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

9.3

Commercial Milestones.

Within  [***]  calendar  days  after  the  end  of  the  first  Fiscal  Year  in  which  aggregate  annual  Net
Sales for that Fiscal Year for all Licensed Products reach any threshold indicated in the Milestone Events listed below, Everest
shall notify Spero of the achievement of

(a)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

42

 
 
 
 
 
 
 
such Milestone Event and Spero shall invoice Everest for the corresponding non-refundable, non-creditable Milestone Payment
set forth below and Everest shall remit payment to Spero within [***] Business Days of the receipt of such invoice, as described
in Section 9.6 (Currency; Exchange Rate; Payments).

Annual Net Sales Milestone Events

Milestone Payments (in U.S. Dollars)

First Fiscal Year in which aggregate annual Net Sales of Licensed Products in the
Territory equal or exceed [***] U.S. dollars ($[***])

$[***]

First Fiscal Year in which aggregate annual Net Sales of Licensed Products in the
Territory equal or exceed [***] U.S. dollars ($[***])

$[***]

First Fiscal Year in which aggregate annual Net Sales of Licensed Products in the
Territory equal or exceed [***] U.S. dollars ($[***])

$[***]

(b)

For the purposes of determining whether a Net Sales Milestone Event has been achieved, Net Sales
of all Licensed Products in the Territory shall be aggregated.  For clarity, the annual Net Sales Milestone Payments set forth in
this Section 9.3 (Commercial Milestones) shall be payable only once for all Licensed Products, upon the first achievement of the
applicable Milestone Event.  

(c)

If a Milestone Event in Section 9.3 (Commercial Milestones) is achieved and payment with respect
to any previous Milestone Event has not been made, then such previous Milestone Event shall be deemed achieved and Everest
shall  notify  Spero  within  [***]  calendar  days  of  such  achievement.  Spero  shall  then  invoice  Everest  for  such  unpaid  previous
Milestone  Event(s)  and  Everest  shall  pay  Spero  such  unpaid  previous  milestone  payment(s)  within  [***]  Business  Days  of
receipt of such invoice.

(d)

Everest  shall  provide  Spero  with  prompt  written  notice  upon  the  occurrence  of  each  Milestone
Event set forth in Section 9.2 (Development and Regulatory Milestone Payments) and Section 9.3 (Commercial Milestones).  In
the event that, notwithstanding the fact that Everest has not given such a notice, Spero believes any such Milestone Event has
occurred, it shall so notify Everest in writing and shall provide to Everest data, documentation or other information that supports
its  belief.    Any  dispute  under  this  Section  9.3(d)  (Commercial  Milestones  -  subsection  (d))  that  relates  to  whether  or  not  a
Milestone Event has occurred shall be referred to the JDC to be resolved in accordance with ARTICLE 4 (Governance) and shall
be  subject  to  resolution  in  accordance  with  Section  15.10  (Dispute  Resolution).    The  Milestone  Payments  made  for  each
Milestone Event shall be non-creditable and non-refundable.

9.4

Royalty Payments.

43

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
 
(a)

Royalty  Rate.    In  partial  consideration  of  the  rights  granted  by  Spero  to  Everest  hereunder,
Everest, its Affiliates and/or its or their respective Sublicensees, as applicable, shall pay to Spero, on a jurisdiction-by-jurisdiction
and Licensed Product-by-Licensed Product basis, non-refundable, non-creditable royalties based on the aggregate Net Sales of all
Licensed Products sold by Everest, its Affiliates and/or its or their respective Sublicensees in the Territory during a Calendar Year
at the rates set forth in the table below. For clarity, the obligation to pay royalties (i) will be imposed only once with respect to the
same unit of a Licensed Product and (ii) will apply to the Net Sales of Licensed Products on the terms herein irrespective of the
assignment of the Assigned Patents under this Agreement and irrespective of whether such Assigned Patents are prosecuted by
Spero or by Everest.   

Calendar  Year  Net  Sales  (in  Dollars)  for  all
Licensed Products
in the Territory
Portion  of  Calendar  Year  Net  Sales  up  to  and
including $[***]
Portion of Calendar Year Net Sales that exceeds
$[***], up to and including $[***]
Portion of Calendar Year Net Sales that exceeds
$[***]

Royalty Rates as a Percentage (%) of
Net Sales

[***]%

[***]%

[***]%

(b)

Royalty  Term.    Royalties  under  this  Section  9.4  (Royalty  Payments)  shall  be  payable  on  a
jurisdiction-by-jurisdiction  and  Licensed  Product-by-Licensed  Product  basis  from  the  First  Commercial  Sale  of  a  Licensed
Product in a jurisdiction until the latest to occur of: (i) expiration of the last‑to‑expire Assigned Patent that contains a Valid Claim
that would, but for the licenses granted hereunder, be infringed by the Manufacture, use or sale of such Licensed Product (or the
Compound contained in such Licensed Product) in such jurisdiction in the Territory; (ii) expiration of Regulatory Exclusivity for
such Licensed Product in such jurisdiction in the Territory; and (iii) [***] years after the First Commercial Sale of the Licensed
Product in such jurisdiction in the Territory (the “Royalty Term” for such Licensed Product and country).  

(c)

Royalty  Reports  and  Payment.    Within  (i)  [***]  calendar  days  after  each  of  the  first  [***]
Calendar  Quarters  of  each  Spero’s  fiscal  years  and  (ii)  [***]  calendar  days  after  the  last  Calendar  Quarter  of  each  of  Spero’s
fiscal  years,  in  each  case  commencing  with  the  Calendar  Quarter  during  which  the  First  Commercial  Sale  of  any  Licensed
Product is made anywhere in the Territory, Everest shall provide Spero with a report that contains the following information for
the applicable Calendar Quarter, on a Licensed Product-by-Licensed Product and jurisdiction-by-jurisdiction basis: (A) Net Sales
in  the  Territory;  (B)  a  calculation  of  the  royalty  payment  due  on  Net  Sales  in  the  Territory;  and  (C)  the  exchange  rates
used.  Within [***] Business Days following the end of each such Calendar Quarter, Everest will pay Spero all royalties owed
with respect to Net Sales for such Calendar Quarter.  If, during the following Calendar Quarter, Everest discovers that it reported
an  incorrect  amount  of  Net  Sales  in  the  Territory  and/or  the  amounts  payment  due  on  such  Net  Sales  in  the  immediately
preceding Calendar Quarter, then Everest may, subject to review by Spero, adjust and reconcile any such calculation of Net Sales

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

44

 
 
 
 
 
and/or any such underpayment or overpayment of royalty payments due, and shall timely report the same within [***] calendar
days after such following Calendar Quarter.  

9.5

Royalty Adjustments.  Except as otherwise set forth in this Agreement, royalties due hereunder are subject
to  adjustment  as  set  forth  below  (such  adjustments  to  be  prorated  for  the  Calendar  Quarter  in  which  the  adjustment  becomes
applicable):

(a)

Royalty  Adjustment  for  Generic  Competition.  In  the  event  that  in  any  jurisdiction  in  the
Territory during the Royalty Term for a Licensed Product in a particular mode of administration there is Generic Competition for
such Licensed Product in such mode of administration in such jurisdiction in any particular Calendar Quarter, then the royalty
rate set forth in Section 9.4(a) (Royalty Rate) with respect to such Licensed Product in such jurisdiction in such Calendar Quarter
shall  be  reduced  by  [***]  percent  ([***]%);  provided  that  in  no  event  shall  any  royalty  payment  payable  to  Spero  for  any
Licensed Product in a jurisdiction in a given Calendar Quarter be reduced as a result of the payment reduction set forth in this
subsection  (b)  of  this  Section  9.5  (Royalty  Adjustments),  in  the  aggregate,  to  less  than  [***]  percent  ([***]%)  of  the  amount
otherwise payable to the Spero with respect to such Licensed Product in such jurisdiction in such Calendar Quarter in accordance
with Section 9.4 (Royalty Payments); and

end user-level database mutually agreed by the Parties).

(b)

Unit Sales.  Unit sales shall be measured by IQVIA (or, in the absence of such data, an appropriate

9.6

Currency; Exchange Rate; Payments.  All payments required to be made by Everest under this Agreement
shall be made in Dollars and shall be paid directly by Everest and not any of its Affiliates. All payments payable to, or invoiced
from  or  on  behalf  of,  Spero  shall  be  paid  bank  wire  transfer  in  immediately  available  funds  to  one  or  more  bank  accounts  of
Spero, as designated in written notice from Spero. If any currency conversion shall be required in connection with any payment
hereunder, such conversion shall be made by using the exchange rates at the closing on the last Business Day of the Calendar
Quarter to which such payment relates as reported in The Wall Street Journal on the following day.

9.7

Late  Payments.    Any  payments  or  portions  thereof  due  hereunder  that  are  not  paid  on  the  date  such
payments are due under this Agreement shall bear interest at an annual rate equal to [***] percentage points above the prime rate
as  published  by  The  Wall  Street  Journal  or  any  successor  thereto  on  the  first  day  of  each  Calendar  Quarter  in  which  such
payments are overdue calculated on the number of days such payment is delinquent.

9.8

Taxes.

Taxes on Income. Notwithstanding anything else set forth in this Section 9.8 (Taxes), each Party
shall  solely  bear  and  pay  all  Taxes  imposed  on  such  Party’s  net  income  or  gain  (however  denominated)  arising  directly  or
indirectly from the activities of the Parties under this Agreement.

(a)

payable by Everest to Spero pursuant to this Agreement (each, a “Payment”)

(b)

Tax  Payments.  The  upfront  payment,  milestone  payments,  royalties  and  any  other  payment

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

45

 
 
 
shall  be  paid  free  and  clear  of  any  and  all  taxes  (which,  for  clarity,  shall  be  the  responsibility  of  Everest),  except  for  any
withholding taxes required by Applicable Laws.  Except as provided in this Section 9.8, Everest shall be solely responsible for
paying any and all taxes (other than withholding taxes required by Applicable Laws to be deducted from Payments and remitted
by Everest) levied on account of, or measured in whole or in part by reference to, any Payments it makes. Everest shall deduct or
withhold  from  the  Payments  any  taxes  that  it  is  required  by  Applicable  Laws  to  deduct  or  withhold.    Notwithstanding  the
foregoing,  if  Spero  is  entitled  under  any  applicable  tax  treaty  to  a  reduction  of  rate  of,  or  the  elimination  of,  applicable
withholding tax, it may deliver to Everest or the appropriate governmental authority (with the assistance of Everest to the extent
that  this  is  reasonably  required  and  is  requested  in  writing)  the  prescribed  forms  necessary  to  reduce  the  applicable  rate  of
withholding or to relieve Everest of its obligation to withhold such tax and Everest shall apply the reduced rate of withholding or
dispense with withholding, as the case may be; provided that Spero has received evidence of Everest's delivery of all applicable
forms (and, if necessary, its receipt of appropriate governmental authorization) at least [***] Business Days prior to the time that
the such Payment is due.  If, in accordance with the foregoing, Everest withholds any amount, it shall pay to Spero the balance
when due, make timely payment to the proper taxing authority of the withheld amount and send to Spero proof of such payment
to such taxing authority within [***] Business Days following such payment.

(c)

Transfer  Tax.    Subject  to  Sections  9.8(a)  (Taxes  on  Income)  and  9.8(b)  (Tax  Payments)  above,
Everest and Spero shall each bear and pay [***] percent ([***]%) of any transfer, stamp, value added, sales, use, or similar Taxes
or  obligations    imposed  on  amounts  payable  by  Everest  to  Spero  (“Transfer  Tax”)  in  connection  with  this  Agreement.  All
Payments are exclusive of Transfer Taxes.  If any Transfer Tax is chargeable in respect of any Payments, Everest shall pay [***]
percent ([***]%) of such Transfer Tax at the applicable rate in respect of any such Payments following the receipt of a Transfer
Tax invoice in the appropriate form issued by Spero in respect of those Payments, such Transfer Taxes to be payable on the later
of the due date of the payment of the Payments to which such Transfer Tax relates and [***] Business Days after the receipt by
Everest of the applicable invoice relating to that Transfer Tax payment.

9.9

Financial  Records  and  Audit.    Everest  shall  (and  shall  ensure  that  its  Affiliates  and  Sublicensees  will)
maintain  complete  and  accurate  books  and  records  pertaining  to  the  Commercialization  of  Licensed  Products  hereunder,
including books and records of invoiced sales and Net Sales of Licensed Products, in sufficient detail to calculate and verify all
amounts payable hereunder and in sufficient detail to permit Spero to confirm the accuracy of any royalty payments, and other
amounts paid or payable under this Agreement and to verify the achievement of Milestone Events under this Agreement.  Everest
shall and shall cause its Affiliates and its and their Sublicensees to, retain such books and records until the later of (a) [***] years
after the end of the period to which such books and records pertain; (b) the expiration of the applicable tax statute of limitations
(or any extensions thereof); and (c) for such period as may be required by Applicable Laws.  Upon at least [***] Business Days’
prior notice, such records shall be open for examination, during regular business hours, for a period of [***] Calendar Years from
the end of the Calendar Year to which such records pertain, and not more often than once each Fiscal Year, by an independent
certified public accountant selected by Spero and reasonably acceptable to Everest, for the sole purpose of verifying for Spero the
accuracy of the financial reports furnished

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

46

 
 
 
by  Everest  under  this  Agreement  or  of  any  payments  made,  or  required  to  be  made,  by  Everest  to  Spero  pursuant  to  this
Agreement.  The independent public accountant shall disclose to Spero only (x) the accuracy of Net Sales reported and the basis
for royalty, Milestone Payments and any other payments made to Spero under this Agreement and (y) the difference, if any, by
which such reported and paid amounts vary from amounts determined as a result of the Audit and the details concerning such
difference. Except as required by Applicable Laws, no other information shall be provided to Spero. No record  may  be  audited
more than once. Spero shall bear the full cost of such audit unless such audit reveals an underpayment by Everest of more than
[***] percent ([***]%) of the amount actually due for any Calendar Year being audited, in which case Everest shall reimburse
Spero for the reasonable costs and expenses for such audit.  Unless disputed pursuant to Section 9.10  (Audit  Dispute),  Everest
shall pay to Spero  any  underpayment  discovered  by  such  audit  within  [***] Business  Days  after  the  accountant’s  report,  plus
interest (as set forth in Section 9.7 (Late Payments)) from the original due date.  If the audit reveals an overpayment by Everest,
then Everest may take a credit for such overpayment against any future payments due to Spero.

9.10

Audit Dispute.  If Everest disputes the results of any audit conducted pursuant to  Section  9.9  (Financial
Records and Audit), the Parties shall work in good faith to resolve the disagreement. If the Parties are unable to reach a mutually
acceptable resolution of any such dispute within [***] Business Days, the dispute shall be submitted for resolution to a certified
public accounting firm jointly selected by each Party’s certified public accountants or to such other Person as the Parties shall
mutually agree (the “Auditor”).  The decision of the Auditor shall be final and the costs of such procedure as well as the initial
audit shall be borne between the Parties in such manner as the Auditor shall determine.  If the Auditor determines that there has
been an underpayment by Everest, Everest shall pay to Spero the underpayment within [***] Business Days after the Auditor’s
decision, plus interest (as set forth in  Section  9.7  (Late  Payments))  from  the  original  due  date.    If  the  Auditor  determines  that
there has been an overpayment by Everest, then Everest may take a credit for such overpayment against any future payments due
to Spero.

ARTICLE 10
INTELLECTUAL PROPERTY RIGHTS

10.1

Ownership of Intellectual Property

(a)

Ownership of Technology.  As between the Parties:

Licensed Know-How with respect to any and all Spero Sole Inventions, and

A.

Spero  shall  solely  own  on  a  worldwide  basis  all  right,  title  and  interest  in  and  to  the

all Everest Sole Inventions, whether or not patented or patentable, and any and all Everest Sole Invention Patents.

B.

Everest shall solely own on a worldwide basis all right, title and interest in and to any and

For clarity, each Party shall own on a worldwide basis and retain all right, title and interest in and to any and all Know-How,
Inventions,  Patents  and  other  intellectual  property  rights  that  are  owned  or  otherwise  Controlled  (other  than  pursuant  to  the
license grants set forth in Section 3.1 (Licenses

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

47

 
 
 
to  Everest)  and  3.2  (License  to  Spero))  by  such  Party  or  its  Affiliates  or  its  or  their  (sub)licensees  (or  Sublicensees)  (as
applicable) outside of this Agreement.

(b)

Ownership of Joint Patents and Joint Inventions.  As between the Parties:

interest in and to any and all Joint Inventions and Joint Invention Patents;

A.

in the Territory, Everest shall be the sole and exclusive owner of all the rights, title and

B.
any and all Joint Inventions and Joint Invention Patents; and

outside the Territory, each of Spero and Everest shall own an equal, undivided interest in

Each of Spero and Everest shall promptly disclose to the other in writing, and shall cause
its  Affiliates  and  its  and  their  respective  Sublicensees  to  so  disclose,  the  development,  making,  conception  or  reduction  to
practice of any Joint Inventions.  Subject to the licenses granted under Section 3.1 (License to Everest) and Section 3.2 (License
to Spero), each of Spero and Everest shall have the right to Exploit the Joint Inventions and Joint Invention Patents.

C.

(c)

United States Law.  The determination of whether Inventions, Know-How and other intellectual
property rights are conceived, discovered, developed or otherwise made by a Party for the purpose of allocating proprietary rights
(including  Patent,  copyright  or  other  intellectual  property  rights)  therein,  shall,  for  purposes  of  this  Agreement,  be  made  in
accordance  with  Applicable  Laws  in  the  United  States  as  such  law  exists  as  of  the  Amendment  Effective  Date  irrespective  of
where or when such conception, discovery, development or making occurs; provided that if the application of such United States
Applicable Laws prevents or materially impairs the proper prosecution or maintenance of Patent Rights in any jurisdiction in the
Territory, then the Parties shall mutually agree to the application of an appropriate Applicable Laws in order to best advance and
maintain the prosecution and maintenance of such Patents in such jurisdiction in the Territory.  Each of Spero and Everest shall,
and does hereby, assign, and shall cause its Affiliates and its and their (sub)licensees and Sublicensees to so assign, to the other
Party,  without  additional  compensation,  such  right,  title  and  interest  in  and  to  any  Inventions,  Know-How,  Patents  and  other
intellectual  property  rights  with  respect  thereto,  as  is  necessary  to  fully  effect,  as  applicable,  the  sole  or  joint  ownership  as
provided for in Section 10.1(a) (Ownership of Technology) or 10.1(b) (Ownership of Joint Patents and Joint Inventions).

(d)

Assignment Obligation.  Each Party shall cause all Persons who perform Development activities,
Manufacturing  activities  or  regulatory  activities  for  such  Party  under  this  Agreement  or  who  conceive,  discover,  develop  or
otherwise make any Inventions, Know-How or other intellectual property rights by or on behalf of either Party or its Affiliates or
its  or  their  (sub)licensees  (or  Sublicensees)  under  or  in  connection  with  this  Agreement  to  be  under  an  obligation  to  assign  to
such  Party  their  rights  in  any  Inventions,  Know-How,  Patents  and  other  intellectual  property,  except  where  Applicable  Laws
requires  otherwise  and  except  in  the  case  of  governmental,  not-for-profit  and  public  institutions  that  have  standard  policies
against such an assignment (in which case, a suitable license or right to obtain such a license, shall be obtained).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

48

 
 
 
 
(e)

Ownership of Product Trademarks.  Subject to Section 12.3 (Effect of Termination) and Section
6.3(d) (Discontinuation), as between the Parties, (i) Everest shall own all right, title and interest in and to the Product Trademarks
in the Territory, (ii) Everest shall have the right to market the Licensed Products in the Licensed Field in the Territory under the
Product Trademarks  and  all  goodwill  associated  therewith  will  inure  to  the  benefit  of  Everest  and  (iii)  Spero  may  not  use  the
Product  Trademarks  without  obtaining  a  proper  trademark  license  from  Everest  (except  to  the  extent  necessary  to  perform  its
obligations under this Agreement).

interest in and to its Corporate Names.

(f)

Ownership  of  Corporate  Names.   As  between  the  Parties,  Spero  shall  retain  all  right,  title  and

Ownership  of  Development  Data.    Subject  to  ARTICLE  3  (Licenses),  Section  6.3(d)
(Discontinuation) and Section 12.3 (Effect of Termination), Everest shall own Everest Development Data and Spero shall own
Spero Development Data.

(g)

10.2

Patent Prosecution and Maintenance.

(a)

Subject  to  Section  10.2(b),  Spero  shall  have  the  first  right,  but  not  the  obligation,  to  control  the
preparation,  filing,  prosecution  (including  any  interferences,  reissue  proceedings  and  reexaminations)  and  maintenance  of  all
Assigned Patents, Joint Patents and Everest Patents, both in and outside the Territory, by counsel of its own choice, except that
such counsel in the Territory shall be reasonably acceptable to Everest (such acceptance not to be unreasonably withheld, delayed
or  conditioned).    Spero  shall  consult  with  Everest  and  keep  Everest  reasonably  informed  of  the  status  of  such  Patents  in  the
Territory and shall promptly provide Everest with all material correspondence received from any patent authority in the Territory
in  connection  therewith.    In  addition,  Spero  shall  promptly  provide  Everest  with  drafts  of  all  proposed  material  filings  and
correspondence to any patent authority in the Territory with respect to such Patents for Everest’s review and comment prior to the
submission of such proposed filings and correspondence.  Spero shall confer with Everest and consider in good faith Everest’s
comments  prior  to  submitting  such  filings  and  correspondence,  provided  that  Everest  provides  such  comments  within  [***]
Business  Days  (or  a  shorter  period  reasonably  designated  by  Spero  if  [***]  Business  Days  is  not  practicable  given  the  filing
deadline)  of  receiving  the  draft  filings  and  correspondence  from  Spero.    The  costs  and  expenses  of  such  preparation,  filing,
prosecution  and  maintenance  of  the  Assigned  Patents,  Joint  Patents  and  Everest  Patents  shall  be  shared  by  Spero  and  Everest
such that Spero shall be responsible for the costs and expenses of such preparation, filing, prosecution and maintenance of Joint
Patents and Everest Patents outside the Territory and Everest shall be responsible for the costs and expenses of such preparation,
filing, prosecution and maintenance of the Assigned Patents, Joint Patents and Everest Patents in the Territory. For the avoidance
of  doubt,  Spero  shall  be  responsible  for  all  costs  incurred  prior  to  the  Effective  Date  with  respect  to  the  prosecution  and
maintenance  of  any  Assigned  Patents.  If  Everest  reasonably  determines  that  an  Assigned  Patent  added  after  the  Amendment
Effective Date (other than Patent Rights added by an In-License Agreement that Everest has accepted pursuant to Section 3.4(b)A
(In-License Agreements)) or a Joint Patent, in either case, is of low value to Everest, then Everest shall promptly notify Spero, in
which case, following delivery of such notice to Spero, Everest shall no longer be obligated to pay for any costs and expenses of
preparation, filing, prosecution and maintenance of such Assigned Patent or Joint Patent, as the case may be.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

49

 
 
 
(b)

Notwithstanding the provisions of Section 10.2(a), upon Everest’s request at any time, Spero shall
immediately  transfer  any  and  all  files  relating  to  the  preparation,  filing,  prosecution  (including  any  interferences,  reissue
proceedings  and  reexaminations)  and  maintenance  of  all  the  Everest  Patents  in  the  Territory  (including  but  not  limited  to
(Assigned Patents) to Everest such that Everest, through counsel of its own choice, controls the preparation, filing, prosecution
and  maintenance of  all  the Everest Patents in the Territory. Under  such  circumstances,  Everest  shall  be  responsible  for  all  the
costs  and  expenses  related  thereto.  Everest  shall  consult  with  Spero  and  keep  Spero  reasonably  informed  of  the  status  of  the
Assigned Patents in the Territory and shall promptly provide Spero with all material correspondence received from any patent
authority in the Territory in connection therewith.  In addition, Everest shall promptly provide Spero with drafts of all proposed
material  filings  and  correspondence  to  any  patent  authority  in  the  Territory  with  respect  to  the  Assigned  Patents  for  Spero’s
review and comment prior to the submission of such proposed filings and correspondence.  Everest shall confer with Spero and
consider in good faith Spero’s comments prior to submitting such filings and correspondence relating to the Assigned Patents,
provided that Spero provides such comments within [***] Business Days (or a shorter period reasonably designated by Everest if
[***] Business Days is not practicable given the filing deadline) of receiving such draft filings and correspondence from Everest.

(c)

Subject  to  the  provisions  of  Section  6.3(d)  (Discontinuation),  in  the  event  that  Spero  desires  to
abandon  or  cease  prosecution  or  maintenance  of  any  Assigned  Patent,  Joint  Patent  or  Everest  Patent  in  the  Territory  (or  any
jurisdiction therein), Spero shall provide reasonable prior written notice to Everest of such intention to abandon (which notice
shall, to the extent possible, be given no later than [***] Business Days prior to the next deadline for any action that must be
taken  with  respect  to  any  such  Patent  in  the  relevant  patent  office  in  the  Territory  or  such  jurisdiction).    In  such  case,  upon
Everest’s written election provided no later than [***] Business Days after such notice from Spero, Everest shall have the right to
assume  prosecution  and  maintenance  of  such  Assigned  Patent,  Joint  Patent  or  Everest  Patent  at  Everest’s  sole  cost  and
expense.  If Everest does not provide such election within [***] Business Days after such notice from Spero, Spero may, in its
sole discretion, continue prosecution and maintenance of such Patent in the Territory (or the relevant jurisdiction), at Everest’s
costs and expense, or discontinue prosecution and maintenance of such Patent in the Territory (or the relevant jurisdiction).

10.3

Cooperation  of  the  Parties.    Each  Party  agrees  to  cooperate  fully  in  the  preparation,  filing,  prosecution
and maintenance of Patents under Section 10.2 (Patent Prosecution and Maintenance), at its own cost. Such cooperation includes:
(a) executing all papers and instruments, or requiring its employees or contractors, to execute such papers and instruments, so as
enable the applicable Party to apply for and to prosecute patent applications in any country as permitted by Section 10.2 (Patent
Prosecution and Maintenance); and (b) promptly informing the other Party of any matters coming to such Party’s attention that
may affect the preparation, filing, prosecution or maintenance of any such patent applications.

10.4

Infringement by Third Parties.

infringement by a Third Party of any Assigned Patent in the Territory

(a)

Notice.  In the event that either Spero or Everest becomes aware of any infringement or threatened

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

50

 
 
 
or any Joint Patent in or outside the Territory, which infringing activity involves the using, making, importing, offering for sale or
selling  of  a  Licensed  Product  (regardless  of  whether  or  not  Everest  and/or  Spero  is  currently  Developing  using,  making,
importing, offering for sale, selling, or otherwise Commercializing the same Licensed Product), or the submission to a Party or a
Regulatory Authority in or outside the Territory of an application for a product referencing a Licensed Product, or any declaratory
judgment  or  equivalent  action  challenging  any  Assigned  Patent  in  the  Territory  or  Joint  Patent  in  or  outside  the  Territory  in
connection with any such infringement (each, a “Product Infringement”), it will promptly notify the other Party in writing to
that  effect.    Any  such  notice  shall  include  evidence  to  support  an  allegation  of  infringement  or  threatened  infringement,  or
declaratory judgment or equivalent action, by such Third Party.

(b)

Enforcement of Assigned Patents and Joint Patents

A.

If  such  Product  Infringement  is  occurring  solely  in  the  Territory,  Everest  shall  have  the
first  right,  as  between  Spero  and  Everest,  but  not  the  obligation,  to  bring  an  appropriate  suit  or  take  other  action  against  any
Person or entity engaged in, or to defend against, a Product Infringement in the Territory of any Assigned Patent or Joint Patent,
at its own expense and by counsel of its own choice.  Spero shall have the right, at its own expense, to be represented in any such
action  by  counsel  of  its  own  choice,  and  Everest  and  its  counsel  will  reasonably  cooperate  with  Spero  and  its  counsel  in
strategizing,  preparing  and  prosecuting  any  such  action  or  proceeding.    If  Everest  fails  to  bring  an  action  or  proceeding  with
respect  to  such  Product  Infringement  in  the  Territory  of  any  Assigned  Patent  or  Joint  Patent  within  (A)  [***]  Business  Days
following the notice of alleged infringement or declaratory judgment or (B) [***] Business Days before the time limit, if any, set
forth  in  the  Applicable  Laws  for  the  filing  of  such  actions,  whichever  comes  first,  Spero  shall  have  the  right,  but  not  the
obligation, to bring and control any such action at its own expense and by counsel of its own choice, and Everest shall have the
right, at its own expense, to be represented in any such action by counsel of its own choice. Except as otherwise agreed by the
Parties  as  part  of  a  cost-sharing  arrangement,  any  recovery  or  damages  realized  as  a  result  of  such  action  or  proceeding  with
respect to Product Infringement in the Territory of any Assigned Patent or Joint Patent, or settlement of the same, shall be used
(A)  first,  to  reimburse  the  Parties’  documented  out-of-pocket  legal  expenses  relating  to  the  action  or  proceeding;  and  (B)  any
remainder after such reimbursement is made shall be shared by Everest and Spero, in proportion to (1) Everest’s loss of sales or
profits  with  respect  to  a  Licensed  Product  in  the  Licensed  Field  in  the  Territory,  and  (2)  Spero’s  lost  Milestone  Payments  and
royalty  payments  that  would  otherwise  be  payable  to  Spero  in  the  absence  of  such  Product  Infringement  in  the  Territory,
provided, that to the extent that any award or settlement (whether by judgment or otherwise) with respect to any Assigned Patent
or Joint Patent is attributable to loss of sales or profits with respect to a Licensed Product in the Licensed Field in the Territory,
any amounts (except punitive damages) that may be recovered or realized by Everest shall be considered Net Sales and subject to
the royalty obligations under Section 9.4 (Royalty Payments) and the commercial Milestone Payment obligations under Section
9.3 (Commercial Milestones).

If  such  Product  Infringement  is  occurring  solely  outside  the  Territory,  Spero  shall  have
the first right, as between Spero and Everest, but not the obligation, to bring an appropriate suit or take other action against any
Person or entity engaged in, or to defend

B.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

51

 
 
 
against,  a  Product  Infringement  outside  the  Territory  of  any  Joint  Patent,  at  its  own  expense  and  by  counsel  of  its  own
choice.  Everest shall have the right, at its own expense, to be represented in any such action by counsel of its own choice, and
Spero and its counsel will reasonably cooperate with Everest and its counsel in strategizing, preparing and prosecuting any such
action  or  proceeding.    If  Spero  fails  to  bring  an  action  or  proceeding  outside  the  Territory  with  respect  to  such  Product
Infringement  of  any  Joint  Patent  within  (A)  [***]  Business  Days  following  the  notice  of  alleged  infringement  or  declaratory
judgment or (B) [***] Business Days before the time limit, if any, set forth in the Applicable Laws for the filing of such actions,
whichever  comes  first,  Everest  shall  have  the  right,  but  not  the  obligation,  to  bring  and  control  any  such  action  outside  the
Territory  at  its  own  expense  and  by  counsel  of  its  own  choice,  and  Spero  shall  have  the  right,  at  its  own  expense,  to  be
represented in any such action by counsel of its own choice.  Except as otherwise agreed by the Parties as part of a cost-sharing
arrangement, any recovery  or  damages  realized  as  a  result  of  such  action  or  proceeding  with  respect  to  Product  Infringement
outside the Territory of any Joint Patent, or settlement of the same, shall be used (A) first, to reimburse the Parties’ documented
out-of-pocket legal expenses relating to the action or proceeding; and (B) any remainder after such reimbursement is made shall
be shared by Everest and Spero, in proportion to (1) Everest’s loss of sales or profits with respect to a Licensed Product in the
Licensed Field in the Territory and (2) Spero’s (or its (sub)licensee’s) loss of sales or profits with respect to a Licensed Product in
the  Licensed  Field  outside  the  Territory;  provided,  that  to  the  extent  that  any  award  or  settlement  (whether  by  judgment  or
otherwise) is allocated to Everest, any such amounts (except punitive damages) so allocated to Everest shall be considered Net
Sales  and  subject  to  the  royalty  obligations  under  Section  9.4  (Royalty  Payments)  and  the  commercial  Milestone  Payment
obligations under Section 9.3 (Commercial Milestones).

Cooperation.    In  the  event  a  Party  brings  an  action  in  accordance  with  this  Section  10.4
(Infringement by Third Parties), the other Party shall cooperate fully, including, if required to bring such action, the furnishing of
a power of attorney or being named as a party to such action.

(c)

(d)

Other Infringement.  Spero shall have the sole right, but not the obligation, to bring and control,
at its own cost and expense, any legal action in connection with any infringement of any Joint Patent outside the Territory that is
not  a  Product  Infringement.  Everest  shall  have  the  sole  right,  but  not  the  obligation,  to  bring  and  control,  at  its  own  cost  and
expense,  any  legal  action  in  connection  with  any  infringement  of  any  Joint  Patent  in  the  Territory  that  is  not  a  Product
Infringement.  Any recovery or damages realized as a result of such action or proceeding with respect to such infringement of any
Joint  Patent  shall  be  used  (A)  first,  but  only  if  a  Joint  Patent  was  the  subject  of  such  legal  action,  to  reimburse  the  Parties’
documented out-of-pocket legal expenses relating to such action or proceeding; and (B) any remainder after such reimbursement,
if applicable, shall be retained by the Party initiating such action or proceeding.

10.5

Infringement Claims by Third Parties.  If the Exploitation of a Licensed Product in the Licensed Field in
the Territory pursuant to this Agreement results in, or is reasonably expected to result in, any claim, suit or proceeding by a Third
Party against Everest or any of its Affiliates or Sublicensees alleging infringement by Everest or any of its Affiliates or its or their
Sublicensees, distributors or customers (a “Third Party Infringement Claim”), including any

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

52

 
 
 
defense or counterclaim in connection with a Product Infringement action initiated pursuant to Section 10.4(b) (Enforcement of
Assigned Patents and Joint Patents), the Party first becoming aware of such alleged infringement shall promptly notify the other
Party  thereof  in  writing.    As  between  the  Parties,  subject  to  ARTICLE  14  (Indemnification;  Liability):    (a)  Everest  shall  be
responsible for defending any such claim, suit or proceeding at its sole cost and expense, using counsel of Everest’s choice; (b)
Spero may participate in any such claim, suit or proceeding with counsel of its choice at its sole cost and expense; provided that
Everest shall retain the right to control such claim, suit or proceeding; (c) Spero shall, and shall cause its Affiliates to, assist and
co-operate with Everest, as Everest may reasonably request from time to time, in connection with its activities set forth in this
Section 10.5 (Infringement Claims by Third Parties), including where necessary, furnishing a power of attorney solely for such
purpose  or  joining  in,  or  being  named  as  a  necessary  party  to,  such  action,  providing  access  to  relevant  documents  and  other
evidence and making its employees available at reasonable business hours; provided that Everest shall reimburse Spero for its
reasonable  and  verifiable  out-of-pocket  costs  and  expenses  incurred  in  connection  therewith;  (d)  Everest  shall  keep  Spero
reasonably informed of all material developments in connection with any such claim, suit or proceeding; (e)  Everest  agrees  to
provide Spero with copies of all material pleadings filed in such action and to allow Spero reasonable opportunity to participate
in the defense of the Claims; and (f) any damages, or awards, including royalties, incurred or awarded in connection with any
Third  Party  Infringement  Claim  defended  under  this  Section  10.5  (Infringement  Claims  by  Third  Parties)  shall  be  borne  by
Everest subject to ARTICLE 14 (Indemnification; Liability).

10.6

Invalidity or Unenforceability Defenses or Actions.  Each Party shall promptly notify the other Party in
writing of any alleged or threatened assertion of invalidity or unenforceability of any of the Assigned Patents, Joint Patents or
Everest Patents worldwide, by a Third Party and of which such Party becomes aware.  As between the Parties:  (a) Spero shall
have the first right, but not the obligation, to defend and control the defense of the validity and enforceability of any Joint Patents
outside the Territory, at its sole cost and expense, using counsel of Spero’s choice; and (b) Everest shall have the first right, but
not the obligation, to defend and control the defense of the validity and enforceability of the Assigned Patents, Everest Patents
worldwide, or Joint Patents in the Territory at its sole cost and expense, using counsel of Everest’s choice.  For purposes of this
Section 10.6 (Invalidity or Unenforceability Defenses or Actions), the Party defending and controlling the defense of the validity
and enforceability pursuant to the foregoing sentence with respect to a Patent shall be the “Controlling Party”.  With respect to
any  such  claim,  suit  or  proceeding  under  this  Section  10.6  (Invalidity  or  Unenforceability  Defenses  or  Actions),  the  non-
Controlling  Party  may  participate  in  such  claim,  suit  or  proceeding  with  counsel  of  its  choice  at  its  sole  cost  and  expense;
provided that the Controlling Party shall retain control of the defense in such claim, suit or proceeding. If the Controlling Party
elects  not  to  defend  the  applicable  Patents  in  a  suit,  then  the  Controlling  Party  shall  notify  the  non-Controlling  Party  of  such
election at least [***] Business Days before the time limit, if any, set forth in Applicable Laws for defending such actions, and
the non-Controlling Party may assume control of the defense of any such claim, suit or proceeding at its sole cost and expense.
The  non-Controlling  Party  in  such  an  action  shall,  and  shall  cause  its  Affiliates  to,  assist  and  co-operate  with  the  Controlling
Party,  as  such  Controlling  Party  may  reasonably  request  from  time  to  time.  in  connection  with  its  activities  set  forth  in  this
Section 10.6 (Invalidity or Unenforceability Defenses or Actions),

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

53

 
 
 
including where necessary, furnishing a power of attorney solely for such purpose or joining in, or being named as a necessary
party  to,  such  action,  providing  access  to  relevant  documents  and  other  evidence  and  making  its  employees  available  at
reasonable business hours; provided that the Controlling Party shall reimburse the non-Controlling Party for its reasonable and
verifiable out-of-pocket costs and expenses incurred in connection therewith.  In connection with any activities with respect to a
defense, claim or counterclaim relating to any Patents licensed under Section 3.1 (License to Everest) or Section 3.2 (License to
Spero), the Controlling Party shall (i) consult with the non-Controlling Party as to the strategy for such activities, (ii) consider in
good  faith  any  comments  from  the  non-Controlling  Party  and  (iii)  keep  the  non-Controlling  Party  reasonably  informed  of  any
material steps taken and provide copies of all material documents filed, in connection with such defense, claim or counterclaim.

10.7

Consent for Settlement.  Neither Party shall unilaterally enter into any settlement or compromise of any
action or proceeding  under  this ARTICLE 10  (Intellectual  Property  Rights)  that  would  in  any  manner  alter,  diminish,  or  be  in
derogation of the other Party’s rights under this Agreement or otherwise without the prior written consent of such other Party,
which shall not be unreasonably withheld, conditioned or delayed.

10.8

Common Ownership under Joint Research Agreement.  Notwithstanding anything to the contrary in this
ARTICLE 10, no Party  shall  have  the  right  to  make  an  election  under  35  U.S.C.  102(c)  when  exercising  its  rights  under  this
ARTICLE 10 without the prior written consent of the other Party.  With respect to any such permitted election, the Parties shall
co-ordinate their activities with respect to any submissions, filings or other activities in support thereof.  The Parties acknowledge
and agree that this Agreement is a “joint research agreement” as defined in 35 U.S.C. 100(h).

10.9

Patent Extensions.   Spero and Everest shall jointly, following consultation with each other, have decision
making  authority  regarding,  and  they  shall  cooperate  with  each  other,  in  obtaining,  patent  term  restoration,  supplemental
protection  certificates  or  their  equivalents,  and  patent  term  extensions  with  respect  to  the  Assigned  Patents,  Joint  Patents,  and
Everest Patents in the Territory where applicable.  If mutually agreed, Everest shall file for such extensions at the Parties’ shared
cost and expense.  If the Parties cannot agree, the matter will be referred to the JDC for decision pursuant to Section 4.3 (JDC
Decision Making).

10.10

Trademarks.  Spero and Everest shall provide to the other Party prompt written notice of any actual or
threatened infringement of the Product Trademarks or Spero Trademarks in the Territory and of any actual or threatened Claim
that the use of the Product Trademarks or Spero Trademarks in the Territory violates the rights of any Third Party, in each case, of
which such Party becomes aware.  Everest shall own and be responsible, at its expense, for all Product Trademarks, trade names,
branding or logos related to the Compound or Licensed Products in the Licensed Field in the Territory.  Everest shall have the
sole  right  to  take  such  action  as  Everest  deems  necessary  against  a  Third  Party  based  on  any  alleged,  threatened  or  actual
infringement, dilution, misappropriation or other violation of or unfair trade practices or any other like offense relating to, the
Product Trademarks by a Third Party in the Territory at its sole cost and expense and using counsel of its own choice and Everest
shall retain any damages or other amounts collected in connection therewith.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

54

 
 
 
10.11

Spero Trademarks.  If Everest is lawfully required by any Regulatory Authority to use any of the Spero
Trademarks  or  any  other  Trademark  used  by  Spero  to  market,  promote,  distribute  and/or  sell  any  Licensed  Product  in  the
Licensed Field outside the Territory for the purpose of Commercialization of the relevant Licensed Product in a jurisdiction in the
Territory, Everest shall promptly notify Spero, and Spero shall immediately grant Everest a non-exclusive, fully-paid, royalty-free
and sublicensable license to use such Spero Trademark or such other Trademark solely in connection with the Commercialization
of the relevant Licensed Product in the Licensed Field in such jurisdiction in the Territory; provided that any such license shall
automatically  terminate  on  the  early  to  occur  of  (i)  the  expiration  or  termination  of  this  Agreement;  (ii)  the  abandonment  by
Everest  of  such  Licensed  Product  in  such  jurisdiction;  and  (iii)  the  abandonment  by  Everest  of  such  Licensed  Product  in  the
Territory.   Except as provided for in the previous clause, if Everest wishes to obtain a license under Spero Trademarks to use
such Spero Trademarks with respect to the Commercialization of the Licensed Products in the Licensed Field in the Territory,
Everest shall notify Spero thereof and the Parties shall negotiate a license with respect thereto, with license terms consistent with
this Agreement.

10.12

Patent Challenges by Spero.

(a)

If  Spero  or  any  of  its  Affiliates  commences  a  Challenge  to  the  validity  or  enforceability  of  any
Assigned Patents or Everest Patents, unless Spero or such Affiliate dismisses or withdraws such legal action within [***] days of
commencing such Challenge, then Everest shall (i) not be required to make any remaining payment under ARTICLE 9 and (ii)
have the right to terminate this Agreement pursuant to Section 12.2(c).

(b)

If  Spero  or  any  of  its  Affiliates  participates  in  a  Challenge  commenced  by  any  other  person  or
entity to the validity or enforceability of any Assigned Patents or Everest Patents, unless Spero or such Affiliate withdraws from
such  legal  action  within  [***]  days  of  participation  in  such  Challenge,  then  Everest  shall  (i)  not  be  required  to  make  any
remaining payment under ARTICLE 9 and (ii) have the right to terminate this Agreement pursuant to Section 12.2(c).

(c)

If  any  sublicensee  of  Spero  or  any  of  its  Affiliates,  individually  or  in  association  with  any  other
person or entity, directly or indirectly, commences or participates in a Challenge to the validity or enforceability of any Assigned
Patents or Everest Patents, unless such sublicensee withdraws from such legal action within [***] days of written notice from
Everest  to  Spero,  then  (i)  Everest  shall  have  the  right  to  terminate  this  Agreement  pursuant  to  Section  12.2(c)  and  (ii)  the
obligation of Everest to make any remaining payments to Spero under ARTICLE 9 shall be suspended until such Challenge is
either settled by the parties or finally determined by a court, arbitrator, patent office or other Government Authority of competent
jurisdiction, in each case from which no appeal can be taken, or from which no appeal was taken within the allowable time period
(such  settlement  or  final  determination,  a  “Challenge  Resolution”).  Once  a  Challenge  Resolution  has  occurred,  then,  on  a
jurisdiction-by-jurisdiction  and  Licensed  Product-by-Licensed  Product,  the  following  provisions  shall,  if  Everest  has  not
terminated this Agreement as a result of such Challenge, apply with respect to the suspension of such payments to Spero:

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

55

 
 
 
A.

If Everest prevailed on the merits of  such  Challenge  and  Everest  is,  as  a  result  of  such
Challenge  Resolution,  not  required  to  (x)  license  any  Patents  in  any  jurisdiction,  (y)  make  any  payments  of  any  type  to  any
Person that participated in such Challenge, including payments in respect of Net Sales of a Licensed Product in any jurisdiction
in the Territory, and (z)  lower the selling price of any Licensed Product in any jurisdiction in the Territory, then the obligation of
Everest  to  make  such  remaining  payments  to  Spero  under  ARTICLE  9  shall  be  reinstated,  retroactive  to  the  date  of  such
suspension; provided that Everest shall be permitted to deduct and offset from such payment obligations under ARTICLE 9 the
actual out-of-pocket costs to Everest (evidence of which shall be furnished to Spero in reasonable written detail at the time of
such deduction and offset) of defending such Challenge (collectively, the “Challenge Defense Costs”) and   

B.

If the Persons participating in such Challenge prevail, in whole or in part, on the merits of
such Challenge and, as a result of such Challenge Resolution, Everest is required to (x) license any Patents in any jurisdiction in
the Territory, (y) make any payments of any type to any Person that participated in such Challenge, including payments in respect
of Net Sales of a Licensed Product in any jurisdiction in the Territory, or (z) lower the selling price of any Licensed Product in
any  jurisdiction  in  the  Territory,  then  the  obligation  of  Everest  to  make  such  remaining  payments  to  Spero  under  ARTICLE  9
shall be reinstated, retroactive to the date of such suspension; provided that (1) Everest shall be permitted to deduct and offset
from such payment obligations the following, without duplication of any such deduction and offset:  (A) the Challenge Defense
Costs; (B) the amounts paid to any Person participating in such Challenge in respect of a license to any Patents in any jurisdiction
in the Territory that Everest was required to obtain as a result of such Challenge Resolution (evidence of which payments shall be
furnished to Spero in reasonable written detail at the time of such deduction and offset); and (C) the payments of any type to a
Person that participated in such Challenge, including payments in respect of Net Sales of a Licensed Product in any jurisdiction
in  the  Territory  (evidence  of  which  shall  be  furnished  to  Spero  in  reasonable  written  detail  at  the  time  of  such  deduction  and
offset); and (2) if Everest is required to lower the selling price of any Licensed Product in any jurisdiction in the Territory, then
Everest  shall  only  be  required  to  make  royalty  payments  hereunder,  if  any,  on  Net  Sales  of  such  Licensed  Product  in  such
jurisdiction in the Territory at such lower selling price as if such selling price were reduced as of the date of such Challenge.

For  clarity,  if  Everest  does  deduct  and  offset  any  Challenge  Defense  Costs  under  this
10.12  (Patent  Challenges  by  Spero)  then  such  Challenge  Defense  Costs  shall  not  constitute  a  Claim  for  which  Everest  or  any
Everest Indemnitee may seek indemnification pursuant to ARTICLE 14ARTICLE 14.

C.

ARTICLE 11
CONFIDENTIALITY; PUBLICATION

11.1

Duty of Confidence. Subject to the other provisions of this ARTICLE 11 (Confidentiality; Publication):

this Agreement will be maintained in confidence and otherwise safeguarded

(a)

all Confidential Information disclosed by a Party (the “Disclosing Party”)  or  its  Affiliates  under

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

56

 
 
 
by the recipient Party (the “Receiving Party”) and its Affiliates using at least the same standard of care as the Receiving Party
uses to protect its own proprietary or Confidential Information (but in no event less than reasonable care);

Information for the purposes of performing its obligations or exercising its rights under this Agreement; and

(b)

the  Receiving  Party,  its  Affiliates  and  Representatives  may  only  use  any  such  Confidential

(c)

the Receiving Party may disclose Confidential Information of the Disclosing Party only to: (i) the
Receiving  Party’s  Affiliates;  and  (ii)  employees,  directors,  agents,  contractors,  Subcontractors,  consultants  and  advisers  of  the
Receiving Party and its Affiliates and, in the case of Everest as the Receiving Party, its Sublicensees, in each case to the extent
reasonably  necessary  for  the  purposes  of,  and  for  those  matters  undertaken  pursuant  to,  this  Agreement  (collectively,  the
“Representatives”);  provided,  that  such  Representatives  are  bound  to  maintain  the  confidentiality,  and  not  to  make  any
unauthorized use, of the Confidential Information in a manner consistent with this ARTICLE 11 (Confidentiality; Publication).

11.2

Exceptions.  The foregoing obligations as to particular Confidential Information of a Disclosing Party shall

not apply to the extent that the Receiving Party can demonstrate by competent evidence that such Confidential Information:

is known by the Receiving Party at the time of its receipt, and not through a prior disclosure by the
Disclosing  Party,  as  demonstrated  by  documentation  or  other  competent  proof  of  the  Receiving  Party,  but  excluding  Joint
Inventions or the terms of this Agreement;

(a)

thereafter enters the public domain through no fault of, or breach of this Agreement by, the Receiving Party;

(b)

is in the public domain by use and/or publication before its receipt from the Disclosing Party, or

is subsequently disclosed to the Receiving Party on a non-confidential basis by a Third Party who,
to the Receiving Party’s knowledge after reasonable inquiry, may lawfully do so and is not under an obligation of confidentiality
to the Disclosing Party; or

(c)

is  developed  by  the  Receiving  Party  independently  and  without  use  of  or  reference  to  any
Confidential  Information  disclosed  to,  or  materials  provided  to,  it  by  or  on  behalf  of  the  Disclosing  Party,  as  shown  by
contemporaneous written documents of the Receiving Party.

(d)

11.3

Authorized Disclosures. Notwithstanding the obligations set forth in Section 11.1 (Duty  of  Confidence),
the Receiving Party may disclose Confidential Information of the Disclosing Party and the terms of this Agreement to the extent
such  disclosure  is  reasonably  necessary  for  such  Disclosing  Party  to  perform  its  obligations  or  exercise  its  rights  under  this
Agreement, in the following instances:

(a)

filing or prosecuting of Patents as permitted by this Agreement;

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

57

 
 
 
obligations under this Agreement;

(b)

enforcing the Receiving Party’s rights under this Agreement or performing the Receiving Party’s

Agreement;

(c)

(d)

in  Regulatory  Filings  for  Licensed  Products  that  such  Party  has  the  right  to  file  under  this

prosecuting or defending litigation as permitted by this Agreement;

(e)

to  the  Receiving  Party’s  Representatives  and  actual  or  potential  Sublicensees  (in  the  case  of
Everest) or (sub)licensees (in the case of Spero), in each case, who have a need to know such Confidential Information in order
for the Receiving Party to exercise its rights or fulfill its obligations under this Agreement; provided, in each case, that any such
Person  agrees  to  be  bound  by  terms  of  confidentiality  and  non-use  (or,  in  the  case  of  the  Receiving  Party’s  attorneys  and
independent accountants, such Person is obligated by applicable professional or ethical obligations) at least as restrictive as those
set forth in this ARTICLE 11 (Confidentiality; Publication);

(f)

to actual or potential investors, investment bankers, lenders, other financing sources, collaborators
or  acquirers  (and  attorneys  and  independent  accountants  thereof)  in  connection  with  potential  investment,  acquisition,
collaboration, merger, public offering, due diligence or similar investigations by such Third Parties or in confidential financing
documents; provided, in each case, that any such Third Party agrees to be bound by terms of confidentiality and non-use (or, in
the case of the Receiving Party’s attorneys and independent accountants, such Third Party is obligated by applicable professional
or  ethical  obligations)  that  are  no  less  stringent  than  those  contained  in  this  Agreement  (except  to  the  extent  that  a  shorter
confidentiality period is customary in the industry); and

(g)

such disclosure is required by court order, judicial or administrative process or Applicable Laws;
provided  that  in  such  event  the  Receiving  Party  shall  promptly  inform  the  Disclosing  Party  of  such  required  disclosure  and
provide  the  Disclosing  Party  an  opportunity  to  challenge  or  limit  the  disclosure  obligations.    Confidential  Information  that  is
disclosed as required by court order, judicial or administrative process or Applicable Laws shall remain otherwise subject to the
confidentiality and non-use provisions of this ARTICLE 11 (Confidentiality; Publication), and the Receiving Party shall take all
steps reasonably necessary, including seeking of confidential treatment or a protective order, to ensure the continued confidential
treatment of such Confidential Information.

11.4

Publication.  Prior to publishing or presenting the results of any studies carried out under this Agreement,
Everest shall submit the draft of the publication or presentation to Spero no later than [***] Business Days prior to the planned
submission for publication or presentation for Spero’s comment.  Everest shall: (a) consider in good faith any comments thereto
provided  by  Spero  within  such  [***]  day  period;  and  (b)  remove  any  Confidential  Information  of  Spero  if  requested  by
Spero.  Spero shall be deemed to have consented to such publication or presentation if it has not sent any response to Everest’s
request within [***] Business Days of receipt of the request by Everest by written notice to Spero delivered pursuant to Section
15.9.  Spero may reasonably request a reasonable delay in publication or presentation in order to protect patentable

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

58

 
 
 
information. If Spero reasonably requests a delay, then Everest shall, and shall ensure that its Affiliate(s) or the Sublicensee(s)
shall, delay submission or presentation for a period of [***] Business Days (or such shorter period as may be mutually agreed by
the Parties) to enable Spero to file patent applications protecting Spero’s rights in such information.

11.5

Publicity/Use of Names.  The Parties intend to agree upon the content of one (1) or more press releases, the
release  of  which  the  Parties  shall  coordinate  in  order  to  accomplish  such  release  promptly  upon  execution  of  this  Agreement.
  Other than as set forth in the prior sentence, no other disclosure of the existence, or the terms, of this Agreement may be made
by  either  Party  or  its  Affiliates,  and  neither  Party  shall  use  the  name,  trademark,  trade  name  or  logo  of  the  other  Party,  its
Affiliates or their respective employee(s) in any publicity, promotion, news release or disclosure relating to this Agreement or its
subject  matter,  without  the  prior  express  written  permission  of  the  other  Party,  except  as  may  be  required  by  Applicable
Laws.    Notwithstanding  the  above,  each  Party  and  its  Affiliates  may  disclose  on  its  website,  in  news  releases,  its  promotional
materials  and  other  disclosures  relating  to  this  Agreement  that  the  other  Party  is  a  development  partner  of  such  Party  for  the
Licensed  Products 
in  conjunction  with  such
disclosure.  Notwithstanding the foregoing:

the  other  Party’s  name  and 

the  Territory  and  may  use 

logo 

in 

(a)

A  Party  may  disclose  this  Agreement  and  its  terms,  and  material  developments  or  material
information  generated  under  this  Agreement,  in  news  releases  and  securities  filings  with  the  U.S.  Securities  and  Exchange
Commission  (“SEC”)  (or  equivalent  foreign  agency)  to  the  extent  required  by  Applicable  Laws  after  complying  with  the
procedure set forth in this Section 11.5 (Publicity/Use of Names).  In such event, the Party seeking to make such disclosure will
prepare a draft of such disclosure together with, if applicable, a confidential treatment request to request confidential treatment
for this Agreement and proposed redacted version of this Agreement, and the other Party agrees to promptly (and in any event, no
less than [***] Business Days after receipt of such request and, if applicable, proposed redactions) give its input in a reasonable
manner  in  order  to  allow  the  Party  seeking  disclosure  to  file  its  request  within  the  time  lines  prescribed  by  applicable  SEC
regulations.  The Party seeking such disclosure shall exercise Commercially Reasonable Efforts to obtain confidential treatment
of this Agreement from the SEC as represented by the redacted version reviewed by the other Party.

(b)

Further, each Party acknowledges that the other Party may be legally required, or may be required
by the listing rules of any exchange on which the other Party’s or its Affiliate’s securities are traded or advised by its counsel, to
make  public  disclosures  (including  in  filings  with  the  SEC  or  other  agency)  of  certain  material  developments  or  material
information  generated  under  this  Agreement  and  agrees  that  each  Party  may  make  such  disclosures  as  required  by  law,  listing
rules or advice; provided that the Party seeking such disclosure shall provide the other Party with a copy of the proposed text of
such disclosure sufficiently in advance of the scheduled release to afford such other Party a reasonable opportunity to review and
comment thereon.

If  either  Party  desires  to  issue  a  press  release  or  make  a  public  announcement  concerning  the
material  terms  of  this  Agreement  or  the  Development,  Commercialization  or  Exploitation  of  the  Compounds  or  a  Licensed
Product under this Agreement,

(c)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

59

 
 
 
such as the achievement of Regulatory Approvals of the Licensed Product or data from a clinical trial, such Party shall provide
the  other  Party  with  the  proposed  text  of  such  announcement  for  prior  review  and,  except  to  the  extent  such  press  release  or
public announcement is permitted by subsection (a) or (b) above, approval by such other Party.

(d)

The  Parties  agree  that  after  a  public  disclosure  has  been  made  or  a  press  release  or  other  public
announcement  has  been  issued  in  compliance  with  subsection  (a),  (b)  or  (c)  hereof,  each  Party  may  make  subsequent  public
disclosures or issue press releases or other public announcements disclosing the same content without having to obtain the other
Party’s prior consent and approval.

11.6

Reporting  of  Financial  Information.    From  and  after  the  Amendment  Effective  Date,  to  the  extent
required by the SEC in connection with Everest or an Affiliate of Everest registering securities in a public offering, Spero shall
(a)  cooperate  with  Everest  or  its  Affiliates  and  their  respective  accountants  and  auditors  by  providing  copies  of  books,  and
records related to the Licensed Products as Everest may reasonably request in connection with the preparation by Everest or its
Affiliates of historical and pro forma financial statements related to the Licensed Products as may be required to be included in
any filing made by Everest or any of its Affiliates under the Securities Act of 1933, as amended, or the Securities Exchange Act
of  1934,  as  amended,  and  the  regulations  promulgated  thereunder,  including  Regulation  S-X  and  (b)  without  limiting  the
foregoing, shall provide Everest with such information as is required for Everest or its Affiliates to prepare audited “carve out”
financial statements related to the Licensed Products, for the [***] Fiscal Years prior to the Amendment Effective Date (or such
shorter period as agreed to by Everest) and information requested by Everest and reasonably necessary to prepare any applicable
pro forma financial information required to be filed by Everest with the SEC.  Everest may also derive such “carve out” financial
statements from Spero’s historical financial statements and accurately present in all material respects the financial position of the
Licensed Products in the Licensed Field in the Territory as of the dates thereof. Everest shall (i) submit to Spero any proposed
filing containing or incorporating by reference any financial statements provided to Everest under this Section 11.6 (Reporting of
Financial Information) as far in advance as reasonably practicable (and in no event, unless inconsistent with Applicable Laws,
less than [***] Business Days prior to the anticipated date of filing) so as to provide Spero a reasonable opportunity to comment
thereon and (ii) in good  faith  consider  incorporating  such  comments. Everest  shall  reimburse  Spero  for  all  costs  and  expenses
incurred by or on account of Spero in connection with its compliance with this Section 11.6 (Reporting of Financial Information).
All information of Spero obtained by or on behalf of Everest under this Section 11.6 (Reporting of Financial Information) shall
be deemed Confidential Information of Spero.

11.7

Privileged Communications.  In furtherance of this Agreement, it is expected that the Parties may, from
time to time, disclose to one another privileged communications with counsel, including opinions, memoranda, letters and other
written,  electronic  and  verbal  communications.    Such  disclosures  are  made  with  the  understanding  that  they  shall  remain
confidential  in  accordance  with  this  ARTICLE  11  (Confidentiality;  Publication),  that  they  will  not  be  deemed  to  waive  any
applicable  attorney-client  or  attorney  work  product  or  other  privilege  and  that  they  are  made  in  connection  with  the  shared
community of legal interests existing between

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

60

 
 
 
Spero and Everest, including the community of legal interests in avoiding infringement of any valid, enforceable patents of Third
Parties and maintaining the validity of the Assigned Patents, Everest Patents and Joint Patents.  In the event of any litigation (or
potential litigation) with a Third Party related to this Agreement or the subject matter hereof, the Parties shall, upon either Party's
request,  enter  into  a  reasonable  and  customary  joint  defense  or  common  interest  agreement.    In  any  event,  each  Party  shall
consult in a timely manner with the other Party before engaging in any conduct (e.g., producing Information or documents) in
connection  with  litigation  or  other  proceedings  that  could  conceivably  implicate  privileges  maintained  by  the  other  Party.
Notwithstanding anything contained in this Section 11.7(Privileged Communications), nothing in this Agreement shall prejudice
a  Party's  ability  to  take  discovery  of  the  other  Party  in  disputes  between  them  relating  to  the  Agreement  and  no  information
otherwise admissible or discoverable by a Party shall become inadmissible or immune from discovery solely by this Section 11.7
(Privileged Communications).

ARTICLE 12
TERM AND TERMINATION

12.1

Term.    Unless  earlier  terminated  as  permitted  by  this  Agreement,  the  initial  term  of  this  Agreement  (the
“Initial Term”) will commence upon the Effective Date and continue in full force and effect, on a jurisdiction-by-jurisdiction and
Licensed Product-by-Licensed Product basis, for [***] years, and, unless earlier terminated as permitted by this Agreement, shall
automatically  renew  for  successive  [***]  year  terms  (each,  a  “Successive  Term”),  in  each  case  unless  earlier  terminated  as
permitted by the Agreement, until expiration of the last Royalty Term for the final Licensed Product in the Territory (the Initial
Term, together with all Successive Terms, being the “Term”).  Following the expiration (but not the earlier termination) of the
Royalty Term for a Licensed Product in a jurisdiction in the Territory, the grants in Section 3.1 (Licenses to Everest) shall become
exclusive,  fully-paid,  royalty-free,  and  irrevocable  for  such  Licensed  Product  in  such  jurisdiction.  For  clarity,  (a)  upon  the
expiration (but not the earlier termination) of the Term, the grants in Section 3.1 (Licenses to Everest) shall become exclusive,
fully-paid, royalty-free, and irrevocable in their entirety solely as to the Licensed Products in the Territory at the time of such
expiration and (b) upon the expiration (but not the earlier termination) of the Term, the grant in Section 3.2 (License to Spero)
shall  become  an  exclusive,  perpetual,  fully-paid,  royalty-free  and  irrevocable  license  to  the  Everest  Technology  to  Exploit
products in the Licensed Field outside the Territory, in each case with the right to grant sublicenses.

12.2

Termination.

(a)

Termination by Everest for Convenience.  At any time, Everest may terminate this Agreement, at
its sole discretion and for any reason or no reason, by providing written notice of termination to Spero, which notice includes an
effective  date  of  termination  at  least  (i)  [***]  days  after  the  date  of  the  notice  if  the  notice  is  given  before  the  Regulatory
Approval  of  any  Licensed  Product;  or  (ii)  [***]  days  after  the  date  of  the  notice  if  the  notice  is  given  after  the  Regulatory
Approval of any Licensed Product.  

breach of its obligations hereunder, then the non-breaching Party may deliver

(b)

Termination  for  Cause.    If  either  Spero  or  Everest  believes  that  the  other  Party  is  in  material

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

61

 
 
 
notice of such breach to the other Party.  The allegedly breaching Party shall have (i) [***] days in the case of a payment breach
and  or  (ii)  [***]  in  the  case  of  a  non-payment  breach,  to  cure  such  breach  from  the  receipt  of  the  notice.    If  the  allegedly
breaching  Party  fails  to  cure  that  breach  within  the  applicable  period  set  forth  above,  then  the  Party  originally  delivering  the
notice of breach may terminate this Agreement on written notice of termination.  Any right to terminate this Agreement under
this Section 12.2(b) (Termination for Cause) shall be stayed and the applicable cure period tolled in the event that, during such
cure  period,  the  Party  alleged  to  have  been  in  material  breach  shall  have  initiated  dispute  resolution  in  accordance  with
Section 15.10 (Dispute Resolution) with respect to the alleged breach, which stay and tolling shall continue until such dispute has
been resolved in accordance with Section 15.10 (Dispute Resolution).  If a Party is determined to be in material breach of this
Agreement, the other Party may terminate this Agreement if the breaching Party fails to cure the breach within [***] days after
the conclusion of the dispute resolution procedure (and such termination shall then be effective upon written notification from the
notifying Party to the breaching Party).

(c)

Termination  for  Patent  Challenge.    Without  affecting  Everest’s  right  to  suspend,  offset  or  be
exempted from remaining payments to Spero pursuant to Section 10.12, Everest may terminate this Agreement upon [***] days’
prior written notice to Spero if Spero or its Affiliates or its or their sublicensees, individually or in association with any other
person or entity, directly or indirectly, commences or participates in a Challenge to the validity or enforceability of any Assigned
Patents or Everest Patents, unless Spero, such Affiliate or sublicensee dismisses or withdraws such legal action within [***] days
of commencing or participation in such Challenge.  Spero may terminate this Agreement upon [***] days’ prior written notice to
Everest  if  Everest  or  its  Affiliates  or  its  or  their  Sublicensees,  individually  or  in  association  with  any  other  person  or  entity,
directly  or  indirectly,  commences  or  participates  in  a  Challenge  to  the  validity  or  enforceability  of  any  Patents  Controlled  by
Spero, unless Everest, such Affiliate or Sublicensee dismisses or withdraws such legal action within [***] days of commencing
or participation in such Challenge.

(d)

Termination for Bankruptcy.  This Agreement may be terminated at any time during the Term by
either Party upon the other Party’s filing or institution of bankruptcy, reorganization, liquidation or receivership proceedings, or
upon an assignment of a substantial portion of the assets for the benefit of creditors by the other Party; provided that in the case
of  any  involuntary  bankruptcy  proceeding  such  right  to  terminate  shall  only  become  effective  if  the  Party  consents  to  the
involuntary bankruptcy or such proceeding is not dismissed within [***] days after the filing thereof.

12.3

Effect of Termination.  Upon termination of this Agreement automatically or by either Party, the following

consequences shall apply and shall be effective as of the effective date of such termination:

(a)

Everest’s license under Section 3.1 (License to Everest) shall terminate;

If this Agreement is terminated by Everest pursuant to Section 12.2(a) (Termination by Everest for
Convenience), or by Spero pursuant to Section 12.2(b) (Termination for Cause), 12.2(b) (Termination for Patent Challenge) or
12.2(d) (Termination for Bankruptcy),

(b)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

62

 
 
 
Spero shall have an exclusive option to acquire back the Assigned Patents pursuant to Section 12.2(b);

(c)

If  this  Agreement  is  terminated  by  Spero  pursuant  to  Section  12.2(b)  (Termination  for  Cause),
12.2(b)  (Termination  for  Patent  Challenge)  or  12.2(d)  (Termination  for  Bankruptcy),  Everest  hereby  grants  to  Spero,  effective
upon such termination, an exclusive (even as to Everest), royalty-free, fully-paid, perpetual and irrevocable license, with the right
to  grant  sublicenses  through  multiple  tiers,  under  the  Everest  Technology,  Everest  Development  Data  and  Everest  Regulatory
Documentation,  to  Develop,  make,  have  made,  use,  import,  offer  for  sale,  sell  and  otherwise  Commercialize  or  Exploit  the
Compound and any product containing the Compound anywhere in the world in all fields of use.

(d)

If  this  Agreement  is  terminated  by  Everest  pursuant  to  Section  12.2(d)  (Termination  for
Bankruptcy), then Spero hereby grants to Everest, effective only upon such termination, an exclusive (even as to Spero), royalty-
free, fully-paid, perpetual and irrevocable license, with the right to grant sublicenses through multiple tiers, under the Licensed
Technology, Spero Development Data and Spero’s Regulatory Documentation, to Develop, make, have made, use, import, offer
for sale, sell and otherwise Commercialize or Exploit the Compound and Licensed Products in the Territory in the Licensed Field.

(e)

If this Agreement is terminated by Everest pursuant to Section 12.2(b) (Termination for Cause), or
12.2(d)  (Termination  for  Bankruptcy),  then  Spero  may  request,  within  [***]  days  of  such  termination,  that  Everest  enter  into
good  faith  negotiations  for  no  more  than  [***]  days  concerning  the  terms  of  an  agreement  with  Everest  granting  to  Spero  an
exclusive  (even  as  to  Everest)  license  under  the  Everest  Technology,  Everest  Development  Data  and  Everest  Regulatory
Documentation.  If no agreement is reached, then the license to Spero under Section 3.2 (License to Spero) shall terminate.  If
such agreement is reached, then such license agreement shall include, among other things, the following provisions:

A.

Spero, its Affiliates and/or its or their respective sublicensees, as applicable, shall pay to
Everest,  on  a  jurisdiction-by-jurisdiction  and  Licensed  Product-by-Licensed  Product  basis,  non-refundable,  non-creditable
royalties  based  on  the  aggregate  Net  Sales  of  all  Licensed  Products  sold  by  Spero,  its  Affiliates  and/or  its  or  their  respective
sublicensees in the Territory during a Calendar Year at the rates set forth in the table below; provided that (A) [***]; and (B) the
obligation to pay royalties will be imposed only once with respect to the same unit of a [***]:

Calendar  Year  Net  Sales  (in  Dollars)  for
[***]
in the Territory

Royalty  Rates  as  a  Percentage  (%)  of
Net Sales

[***]

[***]

[***]%

[***]%

63

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
through 9.10 (Audit Dispute) shall also be included in such license agreement.

B.

Provisions substantially similar to those contained in Sections 9.5 (Royalty Adjustments)

(f)

If this Agreement is terminated by Everest pursuant to Section 12.2(a) (Termination by Everest for
Convenience), then Spero may, within [***] days of termination, request that Everest enter into a license agreement with Spero,
in  which  case  Spero  and  Everest  shall  negotiate  in  good  faith  for  [***]  days  (or  such  longer  period  as  it  takes  to  negotiate,
execute  and  deliver  a  license  agreement),  pursuant  to  which  Everest  grants  to  Spero  an  exclusive  (even  as  to  Everest)  license
under the Everest Technology, Everest Development Data and Everest Regulatory Documentation and in which case such license
agreement shall include, among other things, the following provisions

A.

Spero, its Affiliates and/or its or their respective sublicensees, as applicable, shall pay to
Everest,  on  a  jurisdiction-by-jurisdiction  and  Licensed  Product-by-Licensed  Product  basis,  non-refundable,  non-creditable
royalties  based  on  the  aggregate  Net  Sales  of  all  Licensed  Products  sold  by  Spero,  its  Affiliates  and/or  its  or  their  respective
sublicensees in the Territory during a Calendar Year at the rates set forth in the table below; provided that (A) [***]; and (B) the
obligation to pay royalties will be imposed only once with respect to the same unit of a [***]:

Calendar  Year  Net  Sales  (in  Dollars)  for
[***]
in the Territory

Royalty  Rates  as  a  Percentage  (%)  of
Net Sales

[***]

[***]

[***]%

[***]%

through 9.10 (Audit Dispute) shall also be included in such license agreement.

B.

Provisions substantially similar to those contained in Sections 9.5 (Royalty Adjustments)

Commercialization of the Compound and Licensed Products in the Licensed Field, at its sole cost and expense.

(g)

Spero  shall  be  solely  responsible  for  all  future  worldwide  Development,  Manufacture  and

Everest shall return to Spero or destroy, at Spero’s election, all Confidential Information of Spero,
including  all  copies  thereof  and  all  materials,  substances  and  compositions  delivered  or  provided  by  or  on  behalf  of  Spero  to
Everest.

(h)

Everest shall deliver to Spero all Regulatory Filings and Regulatory Approvals for the Compound
and  any  Licensed  Product,  all  Everest  Development  Data  and  all  Everest  Know-How,  which  Regulatory  Filings,  Regulatory
Approvals, Everest Development Data

(i)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

64

 
 
 
 
 
 
or Everest Know-how shall also be subject to the license grant in the first sentence of Section 12.3(f) (Effect  of  Termination  -
subsection (f)) above.  

(j)

Everest  shall  disclose  to  Spero  all  Everest  Know-How,  Everest  Development  Data  and  all  Joint
Inventions  to  the  extent  not  already  known  to  Spero,  which  may  be  necessary  or  reasonably  useful  for  Spero  to  continue  to
Develop, Manufacture and Commercialize the Compound and Licensed Products in the Licensed Field. In addition, Everest shall,
at Spero’s request, provide reasonable technical assistance and transfer all Everest Know-How, Everest Development Data and
Joint Inventions necessary to Manufacture the Compound or Licensed Products to Spero or its designee.

(k)

All  Confidential  Information  of  Everest  relating  to  the  Compound  or  any  Licensed  Product,
including  without  limitation  all  Everest  Know-How  and  Everest  Development  Data,  shall  become  Confidential  Information  of
Spero, with Spero considered the Disclosing Party and Everest considered the Receiving Party and Everest may not rely on its or
any  of  its  Affiliates’  or  any  Sublicensee’s  possession  or  development  thereof  as  an  exception  under  ARTICLE  11
(Confidentiality; Publication).

Everest  shall,  at  Spero’s  request  and  election,  use  Commercially  Reasonable  Efforts  to  facilitate
negotiations between Spero and Everest’s Third Party providers of clinical research, manufacturing and/or distribution services
and to assign any contracts with such entities to Spero.

(l)

(m)

Everest shall, and shall cause its Affiliates and its and their Sublicensees to, promptly provide a
copy  to  Spero  of  all  Licensed  Product  Agreements,  and,  to  the  extent  requested  by  Spero  in  writing,  use  reasonable  efforts  to
assign to Spero any Licensed Product Agreement, unless, with respect to any such Licensed Product Agreement, such Licensed
Product Agreement expressly prohibits such assignment, in which case Everest (or such Affiliate or Sublicensee, as applicable)
shall cooperate with Spero in all reasonable respects to secure the consent of the applicable Third Party to such assignment, at
Everest’s expense;

possession, provided that Spero shall reimburse Everest for the Cost of Goods of such units.

(n)

Everest  shall  transfer  to  Spero  all  units  of  the  Compound  and  the  Licensed  Products  in  its

(o)

Everest shall, and hereby does, effective on such termination, assign to Spero all of Everest’s and
its  Affiliates’  right,  title  and  interest  in  and  to  any  and  all  Product  Trademarks  and  other  trademarks  used  by  Everest  and  its
Affiliates  in  the  Territory  in  connection  with  its  Development,  Manufacture  or  Commercialization  of  Licensed  Products
(excluding any such trademarks that include, in whole or part, any corporate name or logo of Everest or its Affiliates), including
all goodwill therein, and Everest shall promptly take such actions and execute such instruments, assignments and documents as
may be necessary to effect, evidence, register and record such assignment.

12.4

Survival.    Expiration  or  termination  of  this  Agreement  shall  not  relieve  any  Party  of  any  obligation

accruing prior to such expiration or termination, nor shall expiration or any

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

65

 
 
 
termination of this Agreement preclude either Party from pursuing all rights and remedies it may have under this Agreement, at
law or in equity, with respect to breach of this Agreement.  In addition, the provisions of ARTICLE 1 (Definitions), subclauses
(b) through (d) of Section 6.4 (Rights of Reference), Section 9.8 (Taxes), Section 9.9 (Financial Records and Audit), Section 9.10
(Audit  Dispute),  Section  10.1  (Ownership  of  Intellectual  Property),  ARTICLE  11  (Confidentiality;  Publicity),  Section  12.3
(Effect  of  Termination),  this  Section  12.4  (Survival),  ARTICLE  14  (Indemnification;  Liability),  and  ARTICLE  15  (General
Provisions) hereof shall survive the expiration or termination of this Agreement.

In addition, in the event that this Agreement is terminated by Everest pursuant to Section 12.2(b) (Termination for Cause) and,
pursuant  to  Section  12.3  (Effect  of  Termination),  either  Spero  does  not  timely  request  that  Everest  enter  into  good  faith
negotiations  concerning  the  terms  of  an  agreement  with  Everest  granting  Spero  a  license  under  the  Everest  Technology  and
Everest Development Data, or if no agreement is timely reached, then, the provisions of Sections 10.2 through 10.9 of ARTICLE
10  (Intellectual  Property),  solely  with  respect  to  Joint  Inventions,  shall  also  survive  the  expiration  or  termination  of  this
Agreement.

12.5

Termination Not Sole Remedy.  Termination is not the sole remedy under this Agreement and, whether or
not  termination  is  effected  and  notwithstanding  anything  contained  in  this  Agreement  to  the  contrary,  all  other  remedies  will
remain available except as agreed to otherwise herein.

ARTICLE 13
REPRESENTATIONS AND WARRANTIES

13.1

Representations and Warranties of Each Party. Each Party represents and warrants to each other Parties

as of the Amendment Effective Date that:

hereunder;

(a)

it  has  the  full  right,  power  and  authority  to  enter  into  this  Agreement,  to  perform  its  obligations

(b)

this  Agreement  has  been  duly  executed  by  it  and  is  legally  binding  upon  it,  enforceable  in
accordance with its terms, and does not conflict with any agreement, instrument or understanding, oral or written, to which it is a
party or by which it may be bound, nor violate any material law or regulation of any court, governmental body or administrative
or other agency having jurisdiction over it;

(c)

this  Agreement  is  a  legal,  valid  and  binding  obligation  of  such  Party  enforceable  against  it  in
accordance  with  its  terms  and  conditions,  subject  to  the  effects  of  bankruptcy,  insolvency  or  other  laws  of  general  application
affecting  the  enforcement  of  creditor  rights,  judicial  principles  affecting  the  availability  of  specific  performance  and  general
principles of equity (whether enforceability is considered a proceeding at law or equity);

it  is  not  under  any  obligation,  contractual  or  otherwise,  to  any  Person  that  conflicts  with  or  is
inconsistent in any material respect with the terms of this Agreement or that would impede the diligent and complete fulfillment
of its obligations hereunder; and

(d)

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

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neither it nor any of its Affiliates has been debarred or is subject to debarment and neither it nor
any of its Affiliates will use in any capacity, in connection with the services to be performed under this Agreement, any Person
who has been debarred pursuant to Section 306 of the FFDCA or who is the subject of a conviction described in such section.  

(e)

13.2

Mutual Covenants.

(a)

Employees,  Consultants  and  Contractors.    Each  Party  covenants  that  it  has  obtained  or  will
obtain written agreements from each of its employees, consultants and contractors who perform Development activities pursuant
to  this  Agreement,  which  agreements  will  obligate  such  persons  to  obligations  of  confidentiality  and  non-use  and  to  assign
Inventions in a manner consistent with the provisions of this Agreement.

(b)

Debarment.    Each  Party  represents,  warrants  and  covenants  to  the  other  Parties  that  it  is  not
debarred or disqualified under the FFDCA, as may be amended, or comparable laws in any country or jurisdiction other than the
U.S., and it does not, and will not during the Term, employ or use the services of any person who is debarred or disqualified, in
connection with activities relating to the Compound or any Licensed Product.  In the event that any Party becomes aware of the
debarment  or  disqualification  or  threatened  debarment  or  disqualification  of  any  person  providing  services  to  such  Party,
including the Party itself or its Affiliates, that directly or indirectly relate to activities contemplated by this Agreement, such Party
shall immediately notify the other Parties in writing and such Party shall cease employing, contracting with, or retaining any such
person to perform any such services.

(c)

Compliance.  Each Party covenants as follows:

In the performance of its obligations under this Agreement, such Party shall comply and
shall  cause  its  and  its  Affiliates’  employees  and  contractors  to  comply  with  all  Applicable  Laws,  including  all  export  control,
anti-corruption and anti-bribery laws and regulations, and shall not cause such other Party’s Indemnitees to be in violation of any
Applicable Laws or otherwise cause any reputational harm to such other Party.

A.

B.

Such Party and its and its Affiliates’ employees and contractors shall not, in connection
with  the  performance  of  their  respective  obligations  under  this  Agreement,  directly  or  indirectly  through  Third  Parties,  pay,
promise or offer to pay, or authorize the payment of, any money or give any promise or offer to give, or authorize the giving of
anything  of  value  to  a  Public  Official  or  Entity  or  other  person  for  purpose  of  obtaining  or  retaining  business  for  or  with,  or
directing business to, any person, including, without limitation, either Party (and each Party represents and warrants that as of the
Amendment Effective Date, such Party, and to its knowledge, its and its Affiliates’ employees and contractors, have not directly
or indirectly promised, offered or provided any corrupt payment, gratuity, emolument, bribe, kickback, illicit gift or hospitality or
other illegal or unethical benefit to a Public Official or Entity or any other person in connection with the performance of such
Party’s obligations under this Agreement, and each Party covenants that it and its Affiliates’ employees and contractors shall not,
directly or indirectly, engage in any of the foregoing).

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

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Each  Party  shall  have  the  right  to  suspend  or  terminate  this  Agreement  in  its  entirety
where there is a credible finding, after a reasonable investigation, that the other Party, in connection with performance of such
other Party’s obligations under this Agreement, has violated any anti-corruption or anti-bribery laws or regulations.

C.

D.

Each Party shall not, during the Term, assign, transfer, convey or otherwise encumber its
right,  title  and  interest  in  (A)  Licensed  Technology,  in  the  case  of  Spero,  in  a  manner  that  is  inconsistent  with  the  exclusive
license granted to Everest under Section 3.1 (Licenses to Everest) or (B) Everest Technology, in the case of Everest, in a manner
that is inconsistent with the exclusive license granted to Spero under Section 3.2  (License to Spero), in each case without the
prior written consent of the other Party (which consent shall not be unreasonably withheld, conditioned or delayed)

Each  Party  shall  not  grant  any  right  to  any  Third  Party  under  the  (A)  Licensed
Technology (in the case of Spero) that would conflict with the rights granted to Everest hereunder, or (B) Everest Technology (in
the case of Everest) that would conflict with the rights granted to Spero hereunder.

E.

13.3

Representations  and  Warranties  by  Spero.    Spero  represents  and  warrants  to  Everest  as  of  the

Amendment Effective Date that:

Assigned Patents existing as of the Amendment Effective Date;

(a)

to  Spero’s  knowledge,  the  patents  and  patent  applications  listed  on  Exhibit  A  constitute  all

(b)

Spero  has  sufficient  legal  and/or  beneficiary  title,  ownership  or  license,  free  and  clear  from  any
mortgages,  pledges,  liens,  security  interests,  conditional  and  installment  sales  agreements,  encumbrances,  charges  or  claims  of
any  kind,  to  assign  the  Assigned  Patents,  and  grant  the  license  under  the  Licensed  Technology,  to  Everest  as  purported  to  be
granted under this Agreement;

(c)

Spero  has  not  previously  assigned,  transferred,  conveyed  or  otherwise  encumbered  its  right,  title
and interest in any Assigned Patent or Licensed Technology in a manner that is inconsistent with the assignment to Everest under
Section  2.1  or  the  exclusive  license  granted  to  Everest  under  Section  3.1  (Licenses  to  Everest),  other  than  encumbrances
constituting Permitted Liens.

(d)

The  Assigned  Patents  and  Licensed  Technology  are  complete,  accurate,  effective  and  capable  of
achieving  the  Development  and  Manufacturing  of  the  Compound  and  the  Licensed  Products.  The  Parties  hereby  irrevocably
agree  that  the  Assigned  Patents  and  Licensed  Technology  shall  be  deemed  to  be  complete,  accurate,  effective  and  capable  of
achieving the Development  and  Manufacturing  of  the  Compound  and  the  Licensed Products (and the foregoing representation
and warranty shall be satisfied) if the Compound or the Licensed Products (as the case may be) is/are capable of being produced
in  a  manner  that  complies  with  the  specifications  contained  in  (i)  the  technical  documents  Spero  provided  to  Everest  for
evaluation and (ii) IND(s) submitted to the applicable Regulatory Authority(ies).  

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

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(e)

Spero has not received any notice from a Third Party that the Development of the Compound  or
any Licensed Product conducted by Spero prior to the Amendment Effective Date has infringed any Patents of any Third Party or
infringed  or  misappropriated  any  other  intellectual  property  of  any  Third  Party.  Based  on  Spero’s  understanding  as  of  the
Amendment Effective Date of the Compound and the Licensed Products and their intended use as of the Amendment Effective
Date, the Development, Manufacture, use or sale of any Compound or any Licensed Product  pursuant  to  this  Agreement  does
not, to the knowledge of Spero, (y) infringe any Patents of any Third Party or (z) infringe or misappropriate any other intellectual
property  of  any  Third  Party.  No  claim  or  action  has  been  brought  or,  to  Spero’s  knowledge,  threatened  in  writing,  by  any
Governmental  Authority  or  Third  Party  (i)  that  any  Spero  Trademark  violates  the  rights  of  a  Third  Party  or  (ii)  currently
challenging the enforceability or validity of any Spero Trademark;

Assigned Patents or Licensed Technology that would conflict with the rights granted to Everest hereunder;

(f)

Spero has not as of the Amendment Effective Date granted any right to any Third Party under any

or misappropriating any of the Assigned Patents or Licensed Technology;

(g)

Spero has no knowledge as of the Amendment Effective Date of any Third Party that is infringing

no claim or action has been brought or, to Spero’s knowledge, threatened in writing by any Third
Party alleging that the issued patents in the Assigned Patent Rights are invalid or unenforceable, and none of the Existing Patent
Rights is the subject of any interference, opposition, cancellation or other protest proceeding;

(h)

(i)

with  respect  to  any  Assigned  Patents  for  which  the  U.S.  federal  government  retains  rights  as
identified  in  Section  3.1(b)  (Licenses  to  Everest  -  subsection  (b)),  Spero  has  complied  with  all  its  obligations  pursuant  to  35
U.S.C. §§ 200-212 and 37 C.F.R. § 401 et seq., and has taken all steps required pursuant to 35 U.S.C. §§ 200-212 and 37 C.F.R. §
401 et seq. to grant the rights under such Assigned Patents to Everest as provided under 3.1 (Licenses to Everest);

controlled by Spero that is necessary for the Development of the Compound that is not within the Licensed Know-How; and

(j)

to  Spero’s  knowledge,  as  of  the  Amendment  Effective  Date,  there  is  no  Know-How  owned  or

(k)

to  Spero’s  knowledge,  (x)  all  clinical  trials  conducted  by  Spero  or  its  Affiliates  prior  to  the
Amendment Effective Date have been in compliance in all material respects with all Applicable Laws, and (y) no data or other
information generated or otherwise received from such clinical trials conducted up to the Amendment Effective Date has, or is
reasonably expected to have, any materially negative impact on the Exploitation of any Licensed Product in the Territory.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

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13.4

Representations  and  Warranties  by  Everest.    Everest  represents  and  warrants  to  Spero  as  of  the

Amendment Effective Date that:

Everest has not previously assigned, transferred, conveyed or otherwise encumbered its right, title
and interest in Everest Technology in a manner that is inconsistent with the exclusive license granted to Spero under Section 3.2
(License to Spero);

(a)

to any Third Party under the Everest Technology that would conflict with the rights granted to Spero hereunder;

(b)

Everest has not as of the Amendment Effective Date, and will not during the Term, grant any right

or misappropriating any of the Everest Technology;

(c)

Everest has no knowledge as of the Amendment Effective Date of any Third Party that is infringing

no claim or action has been brought or, to Everest’s knowledge, threatened in writing by any Third
Party  alleging  that  the  Everest  Patents  are  invalid  or  unenforceable,  and  no  Everest  Patent  is  the  subject  of  any  interference,
opposition, cancellation or other protest proceeding;

(d)

the Development of the Compound or the Licensed Products that is Controlled by any Third Party; and

(e)

to Everest’s knowledge, as of the Amendment Effective Date, there is no Know-How necessary for

(f)

as of the Amendment Effective Date, Everest has the capability to, and reasonably believes it has or
will  have  sufficient  access  to  the  financial  resources  necessary  to,  perform  its  obligations  under  this  Agreement,  including
without  limitation,  its  obligations  to  (i)  use  Commercially  Reasonable  Efforts  to  Develop,  Exploit,  Commercialize  and  obtain
Regulatory  Approval  for  the  Compounds  and  each  Licensed  Product  in  the  Licensed  Field  in  the  Territory  and  (ii)  make  the
required payments to Spero hereunder.

13.5

No Other Warranties.    EXCEPT  AS  EXPRESSLY  SET  FORTH  IN  THIS  AGREEMENT,  NO  PARTY
MAKES, AND EACH PARTY EXPRESSLY DISCLAIMS, ANY AND ALL WARRANTIES OF ANY KIND, EXPRESS OR
IMPLIED,  INCLUDING  THE  WARRANTIES  OF  DESIGN,  MERCHANTABILITY,  FITNESS  FOR  A  PARTICULAR
PURPOSE, VALIDITY OF PATENTS, NON-INFRINGEMENT OF THE INTELLECTUAL PROPERTY RIGHTS OF THIRD
PARTIES, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICES.

ARTICLE 14
INDEMNIFICATION; LIABILITY

14.1

Indemnification  by  Spero.    Spero  shall  indemnify,  defend  and  hold  Everest,  its  Affiliates,  and  their
respective officers, directors, agents and employees (“Everest Indemnitees”) harmless from and against any Claims against them
to the extent arising or resulting from:

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

70

 
 
 
(a)

(b)

the material breach by Spero of this Agreement (other than a breach of Section 13.3(d));

the  gross  negligence  or  willful  misconduct  on  the  part  of  Spero  or  its  Affiliates  or  its  or  their

respective officers, directors, agents or employees in performing its obligations under this Agreement; or

distributors or contractors of the Compound or the Licensed Products outside the Territory;

(c)

the  Exploitation  by  Spero  or  any  of  its  Affiliates  or  its  or  their  sublicensees  or  its  or  their

except, in each case (a), (b) and (c) above, for those Claims for which Everest has an obligation to indemnify Spero pursuant to
Section 14.2 (Indemnification by Everest) hereof or, to the extent such Claims result from the material breach by Everest of any
covenant, representation, warranty or other agreement made by Everest in this Agreement or the negligence or willful misconduct
of  any  Everest  Indemnitee.    Notwithstanding  the  above,  Spero  will  have  no  obligation  to  defend  or  indemnify  Everest  or  its
Affiliates for any claim brought by a shareholder or a class of shareholders of Everest or its Affiliates including, but not limited
to, securities fraud claims, shareholder direct claims, and shareholder derivative claims, except to the extent resulting from the
gross negligence or willful misconduct on the part of Spero or any Affiliate.

14.2

Indemnification  by  Everest.  Everest  shall  indemnify,  defend  and  hold  Spero,  its  Affiliates,  and  their
respective officers, directors, agents and employees (“Spero Indemnities”) harmless from and against any Claims arising under
or related to this Agreement against them to the extent arising or resulting from:

(a)

(b)

the material breach by Everest of this Agreement;

the  gross  negligence  or  willful  misconduct  on  the  part  of  Everest  or  its  Affiliates  or  its  or  their

respective officers, directors, agents or employees in performing its obligations under this Agreement; or

distributors or contractors of the Compound or the Licensed Products in the Territory;

(c)

the  Exploitation  by  Everest  or  any  of  its  Affiliates  or  its  or  their  Sublicensees  or  its  or  their

except,  in  each  case  (a), (b)  and  (c)  above,  those  Claims  for  which  Spero  has  an  obligation  to  indemnify  Everest  pursuant  to
Section  14.1  (Indemnification  by  Spero)  hereof  or,  to  the  extent  such  Claims  result  from  the  material  breach  by  Spero  of  any
covenant, representation (other than the representation set forth in Section 13.3(d), warranty or other agreement made by Spero in
this Agreement or the negligence or willful misconduct of any Spero Indemnitee.  Notwithstanding the above, Everest will have
no obligation to defend or indemnify Spero or its Affiliates for any claim brought by a shareholder or a class of shareholders of
Spero or its Affiliates including, but not limited to, securities fraud claims, shareholder direct claims, and shareholder derivative
claims, except to the extent resulting from the gross negligence or willful misconduct on the part of Everest or any Affiliate.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

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14.3

Indemnification Procedure

(a)

Notice of Claim.  All indemnification claims in respect of a Party, its Affiliates or their respective
directors, officers, employees and agents shall be made solely by such Party to this Agreement (the “Indemnified Party”).  The
Indemnified Party shall give the other Party (the “Indemnifying Party”) a prompt written notice (an “Indemnification Claim
Notice”)  of  any  Claims  or  discovery  of  fact  upon  which  such  Indemnified  Party  intends  to  base  a  request  for  indemnification
under this ARTICLE 14 (Indemnification; Liability), but in no event shall the Indemnifying Party be liable for any Claims to the
extent  that  such  Claims  result  from  any  delay  in  providing  such  notice.    Each  Indemnification  Claim  Notice  must  contain  a
description  of  the  Claim  and  the  nature  and  amount  of  such  Claim  (to  the  extent  that  the  nature  and  amount  of  such  Claim  is
known at such time).

(b)

Control of Defense.   The  Indemnifying  Party  shall  have  the  right  to  assume  the  defense  of  any
Claim  by  giving  written  notice  to  the  Indemnified  Party  within  [***]  days  after  the  Indemnifying  Party’s  receipt  of  an
Indemnification Claim Notice. The assumption of the defense of a Claim by the Indemnifying Party shall not be construed as an
acknowledgment  that  the  Indemnifying  Party  is  liable  to  indemnify  the  Indemnified  Party  in  respect  of  the  Claim,  nor  shall  it
constitute  a  waiver  by  the  Indemnifying  Party  of  any  defenses  it  may  assert  against  the  Indemnified  Party’s  claim  for
indemnification.  Upon assuming the defense of a Claim, the Indemnifying Party may appoint as lead counsel in the defense of
the  Claim  any  legal  counsel  selected  by  the  Indemnifying  Party;  provided  that  it  obtains  the  prior  written  consent  of  the
Indemnified Party (which consent shall not be unreasonably withheld, conditioned or delayed).  In the event the Indemnifying
Party  assumes  the  defense  of  a  Claim,  upon  the  Indemnifying  Party’s  relevant  notice  the  Indemnified  Party  shall  immediately
deliver to the Indemnifying Party all original notices and documents (including court papers) received by the Indemnified Party
in  connection  with  the  Claim.    Should  the  Indemnifying  Party  assume  the  defense  of  a  Claim,  except  as  provided  in  Section
14.3(c)  (Right  to  Participate  in  Defense),  the  Indemnifying  Party  shall  not  be  liable  to  the  Indemnified  Party  for  any  legal
expenses subsequently incurred by such Indemnified Party in connection with the analysis, defense or settlement of the Claim
unless specifically requested and approved in writing by the Indemnifying Party.  In the event that it is ultimately determined that
the Indemnifying Party is not obligated to indemnify, defend or hold harmless the Indemnified Party from and against the Claim,
the Indemnified Party shall reimburse the Indemnifying Party for any and all reasonable and verifiable out-of-pocket costs and
expenses (including attorneys’ fees and costs of suit) incurred by the Indemnifying Party in accordance with this ARTICLE 14
(Indemnification; Liability) in its defense of the Claim.

(c)

Right  to  Participate  in  Defense.   Any  Indemnified  Party  shall  be  entitled  to  participate  in  the
defense of such Claim and to employ counsel of its choice for such purpose; provided, however, that such employment shall be at
the Indemnified Party’s sole cost and expense unless (i) the employment thereof has been specifically authorized in writing in
advance  by  the  Indemnifying  Party  (in  which  case,  the  defense  shall  be  controlled  as  provided  in  Section  14.3(b)  (Control  of
Defense),  with  such  provisions  applying  mutatis  mutandis;  (ii)  the  Indemnifying  Party  has  failed  to  assume  the  defense  and
employ counsel in accordance with Section 14.3(b) (Control of Defense) (in which case the Indemnified Party shall control the
defense, with the reasonable

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

72

 
 
 
out-of-pocket  expense  with  respect  thereto  borne  by  the  Indemnifying  Party);  or  (iii)  the  interests  of  the  indemnitee  and  the
Indemnifying Party with respect to such Claim are sufficiently adverse to prohibit the representation by the same counsel of both
Parties  under  Applicable  Laws,  ethical  rules  or  equitable  principles  (in  which  case,  the  Indemnified  Party  shall  control  its
defense, with the reasonable out-of-pocket expense with respect thereto borne by the indemnifying Party).

(d)

Settlement.    With  respect  to  any  Claims  relating  solely  to  the  payment  of  money  damages  in
connection  with  a  Claim  that  shall  not  result  in  the  applicable  indemnitee(s)  becoming  subject  to  injunctive  or  other  relief  or
otherwise  adversely  affect  the  business  or  interests  of  the  Indemnified  Party  in  any  manner  and  as  to  which  the  Indemnifying
Party  shall  have  acknowledged  in  writing  the  obligation  to  indemnify  the  applicable  indemnitee  hereunder,  the  Indemnifying
Party shall have the sole right to consent to the entry of any judgment, enter into any settlement or otherwise dispose of such
Claim, on such terms as the Indemnifying Party, in its sole discretion, shall deem appropriate.  With respect to all other Claims in
connection with Claims, where the Indemnifying Party has assumed the defense of the Claim in accordance with Section 14.3(b)
(Control  of  Defense),  the  Indemnifying  Party  shall  have  authority  to  consent  to  the  entry  of  any  judgment,  enter  into  any
settlement  or  otherwise  dispose  of  such  Claim;  provided,  it  obtains  the  prior  written  consent  of  the  Indemnified  Party  (which
consent shall not be unreasonably withheld, conditioned or delayed).  If the Indemnifying Party does not assume and conduct the
defense  of  a  Claim  as  provided  above,  the  Indemnified  Party  may  defend  against  such  Claim;  provided,  that  the  Indemnified
Party  shall  not  settle  any  Claim  without  the  prior  written  consent  of  the  Indemnifying  Party  (which  consent  shall  not  be
unreasonably withheld, conditioned or delayed).

(e)

Cooperation.    If  the  Indemnifying  Party  chooses  to  defend  or  prosecute  any  Claim,  the
Indemnified  Party  shall  and  shall  cause  each  indemnitee  to,  cooperate  in  the  defense  or  prosecution  thereof  and  furnish  such
records, information and testimony, provide such witnesses and attend such conferences, discovery proceedings, hearings, trials
and appeals as may be reasonably requested by the indemnifying Party in connection therewith.  Such cooperation shall include
access during normal business hours afforded to the Indemnifying Party to and reasonable retention by the Indemnified Party of,
records and information that are reasonably relevant to such Claim and making the Indemnified Party, the indemnitees and other
employees and agents available on a mutually convenient basis to provide additional information and explanation of any material
provided hereunder and the indemnifying Party shall reimburse the Indemnified Party for all of its, its Affiliates’ and its and their
(sub)licensees’ or their respective directors’, officers’, employees’ and agents’, as applicable, reasonable and verifiable out-of-
pocket expenses in connection therewith.

(f)

Expenses.  Except as provided above, the costs and expenses, including fees and disbursements of
counsel, incurred by the Indemnified Party and its Affiliates and its and their sublicensees and their respective directors, officers,
employees  and  agents,  as  applicable,  in  connection  with  any  Claim  shall  be  reimbursed  on  a  Calendar  Quarter  basis  by  the
Indemnifying  Party,  without  prejudice  to  the  Indemnifying  Party’s  right  to  contest  the  Indemnified  Party’s  right  to
indemnification and subject to refund in the event the indemnifying Party is ultimately held not to be obligated to indemnify the
Indemnified Party.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

73

 
 
 
14.4

Mitigation  of  Loss.    Each  Indemnified  Party  will  take  and  will  procure  that  its  Affiliates  take  all  such
reasonable steps and action as are reasonably necessary or as the Indemnifying Party may reasonably require in order to mitigate
any  Claims  (or  potential  losses  or  damages)  under  this  ARTICLE 14  (Indemnification;  Liability).    Nothing  in  this  Agreement
shall or shall be deemed to relieve any Party of any common law or other duty to mitigate any losses incurred by it.

14.5

Special,  Indirect  and  Other  Losses.  EXCEPT  IN  THE  EVENT  OF  A  BREACH  OF  SECTION  3.7
(NON-DIVERSION), SECTION 3.8 (NON-COMPETE) OR ARTICLE 11 (CONFIDENTIALITY; PUBLICATION), NEITHER
PARTY  SHALL  BE  ENTITLED  TO  RECOVER  FROM  THE  OTHER  PARTY  ANY  SPECIAL,  INCIDENTAL,
CONSEQUENTIAL  OR  PUNITIVE  DAMAGES  IN  CONNECTION  WITH  THIS  AGREEMENT  OR  ANY  LICENSE
GRANTED  HEREUNDER;  provided,  however,  that  this  Section  14.5  shall  not  be  construed  to  limit  either  Party’s
indemnification  obligations  under  Section  14.1  (Indemnification  by  Spero)  or  Section  14.2  (Indemnification  by  Everest),  as
applicable.

14.6

Insurance.  Each Party, at its own expense, shall maintain product liability and other appropriate insurance
(or  self-insure)  in  an  amount  consistent  with  sound  business  practice  and  reasonable  in  light  of  its  obligations  under  this
Agreement during the Term.  Each Party shall provide a certificate of insurance (or evidence of self-insurance) evidencing such
coverage to the other Party upon request.

ARTICLE 15
GENERAL PROVISIONS

15.1

15.2

Governing Law. This Agreement shall be governed by and construed in accordance with the law of [***].

Assignment.  

(a)

Except  as  expressly  provided  hereunder,  neither  this  Agreement  nor  any  rights  or  obligations
hereunder may be assigned or otherwise transferred by either Party without the prior written consent of the other Party (which
consent shall not be unreasonably withheld); provided that either Party may assign or otherwise transfer this Agreement and its
rights  and  obligations  hereunder  without  the  other  Party’s  consent:  (a)  in  connection  with  the  transfer  or  sale  of  all  or
substantially  all  of  the  business  or  assets  of  such  Party  to  which  this  Agreement  relates  to  a  Third  Party,  whether  by  merger,
consolidation, divesture, restructure, sale of stock, sale of assets or otherwise; provided that in the event of any such transaction
(whether this Agreement is actually assigned or is assumed by the acquiring party by operation of law (e.g., in the context of a
reverse triangular merger)), intellectual property rights of the acquiring party to such transaction (if other than one of the Parties
to this Agreement) and its Affiliates existing prior to the transaction shall not be included in the technology licensed hereunder;
or (b) to an Affiliate, provided that the assigning Party shall remain liable and responsible to the non-assigning Party hereto for
the performance and observance of all such duties and obligations by such Affiliate; and provided,  further, that in any such case
the assigning Party shall provide written notice to the other Party  within [***] calendar days after such assignment or transfer.
The rights and obligations of the

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

74

 
 
 
Parties under this Agreement shall be binding upon and inure to the benefit of the successors and permitted assigns of the Parties,
and the name of a Party appearing herein will be deemed to include the name of such Party’s successors and permitted assigns to
the extent necessary to carry out the intent of this section.  Any assignment not in accordance with this Section 15.2 (Assignment)
shall be null and void.  

(b)

The rights to Information, materials and intellectual property:

Controlled by a Third Party permitted assignee of a Party that immediately prior to such
assignment (other than as a result of a license or other grant of rights, covenant or assignment by such Party or its Affiliates to, or
for the benefit of, such Third Party); or

A.

Controlled  by  an  Affiliate  of  a  Party  that  becomes  an  Affiliate  through  any  Change  of
Control of such Party that were Controlled by such Affiliate (and not such Party) immediately prior to such Change of Control
(other than as a result of a license or other grant of rights, covenant or assignment by such Party or its other Affiliates to, or for
the benefit of, such Affiliate);

B.

shall, in each of cases (1) and (2) above, be automatically excluded from the rights licensed or granted to the other Party under
this Agreement.

15.3

Entire Agreement; Modification.  This Agreement is both a final expression of the Parties’ agreement and
a complete and exclusive statement with respect to all of its terms.  This Agreement supersedes all prior and contemporaneous
agreements  and  communications,  whether  oral,  written  or  otherwise,  concerning  any  and  all  matters  contained  herein.    No
amendment, modification, release or discharge shall be binding on the Parties unless in writing and duly executed by authorized
representatives of each of Spero and Everest; provided that, pursuant to the definition of “Spero Trademarks” herein, Spero may
designate in a writing to Everest from time to time such other Trademarks, names and logos as Spero, as the case may be, may
reasonably  determine.    In  the  event  of  any  inconsistencies  between  this  Agreement  and  any  schedules  or  other  attachments
hereto, the terms of this Agreement shall control.

15.4

Relationship  among  the  Parties.    The  Parties’  relationship  with  one  another,  as  established  by  this
Agreement, is solely that of independent contractors.  This Agreement does not create any partnership, joint venture or similar
business relationship between the Parties.  Neither Party is a legal representative of the other Party.  Neither Party can assume or
create  any  obligation,  representation,  warranty  or  guarantee,  express  or  implied,  on  behalf  of  the  other  Party  for  any  purpose
whatsoever.   All  persons  employed  by  a  Party  shall  be  employees  of  such  Party  and  not  of  the  other  Party  and  all  costs  and
obligations incurred by reason of any such employment shall be for the account and expense of such first Party.

15.5

Non-Waiver.  The failure of a Party to insist upon strict performance of any provision of this Agreement or
to  exercise  any  right  arising  out  of  this  Agreement  shall  neither  impair  that  provision  or  right  nor  constitute  a  waiver  of  that
provision or right, in whole or in part, in that instance or in any other instance.  Any waiver by a Party of a particular provision or
right

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

75

 
 
 
shall be in writing, shall be as to a particular matter and, if applicable, for a particular period of time and shall be signed by such
Party.    The  rights  and  remedies  provided  herein  are  cumulative  and  do  not  exclude  any  other  right  or  remedy  provided  by
Applicable Law or otherwise available except as expressly set forth herein.

15.6

Force Majeure.  Neither Party shall be held liable or responsible to the other Party or be deemed to have
defaulted under or breached this Agreement for failure or delay in fulfilling or performing any term of this Agreement (other than
an obligation to make payments) when such failure or delay is caused by or results from events beyond the reasonable control of
the  non-performing  Party,  including  fires,  floods,  earthquakes,  hurricanes,  embargoes,  shortages,  epidemics,  pandemics,
quarantines,  war,  acts  of  war  (whether  war  be  declared  or  not),  terrorist  acts,  insurrections,  riots,  civil  commotion,  strikes,
lockouts or other labor disturbances (whether involving the workforce of the non-performing Party or of any other Person), acts
of  God  or  acts,  omissions  or  delays  in  acting  by  any  governmental  authority  (including  expropriation,  seizure  of  works,
requisition, nationalization, exercise of march-in rights or compulsory licensing, except to the extent such delay results from the
breach by the non-performing Party or any of its Affiliates of any term or condition of this Agreement) and any material change
in the Applicable Laws of a Regulatory Authority that results in a development, clinical or regulatory delay of [***] Business
Days of more.  The  non-performing  Party  shall  notify  the  other  Party  of  such force majeure within [***] Business Days after
such occurrence by giving written notice to the other Party stating the nature of the event, its anticipated duration and any action
being taken to avoid or minimize its effect.  The suspension of performance shall be of no greater scope and no longer duration
than is necessary and the non-performing Party shall use Commercially Reasonable Efforts to remedy its inability to perform.

15.7

Export Control.  This Agreement is made subject to any restrictions concerning the export of products or
technical information from the United States or other countries that may be imposed on the Parties from time to time.  Each Party
agrees that it will not export, directly or indirectly, any technical information acquired from the other Party under this Agreement
or any products using such technical information to a location or in a manner that at the time of export requires an export license
or  other  governmental  approval,  without  first  obtaining  the  written  consent  to  do  so  from  the  appropriate  agency  or  other
governmental entity in accordance with Applicable Laws. Spero hereby undertakes to use Commercially Reasonable Efforts to
obtain  necessary  licenses  (if  required)  for  exporting  the  Compound,  the  Licensed  Products,  the  Assigned  Patents  and  the
Licensed Technology from the United States or other countries.

15.8

Severability.  If any provision of this Agreement is held to be illegal, invalid or unenforceable under any
present or future law and if the rights or obligations of either Party under this Agreement will not be materially and adversely
affected thereby: (a) such provision shall be fully severable; (b) this Agreement shall be construed and enforced as if such illegal,
invalid  or  unenforceable  provision  had  never  comprised  a  part  hereof;  (c)  the  remaining  provisions  of  this  Agreement  shall
remain in full force and effect and shall not be affected by the illegal, invalid or unenforceable provision or by its severance here
from;  and  (d)  in  lieu  of  such  illegal,  invalid  or  unenforceable  provision,  there  shall  be  added  automatically  as  a  part  of  this
Agreement a legal, valid and enforceable provision as similar in terms to such illegal, invalid or unenforceable

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

76

 
 
 
provision as may be possible and reasonably acceptable to the Parties.  To the fullest extent permitted by Applicable Laws, each
Party hereby waives any provision of law that would render any provision hereof illegal, invalid or unenforceable in any respect.

15.9

Notices.  Any notice to be given under this Agreement must be in writing and delivered either (a) in person,
(b)  by  air  mail  (postage  prepaid)  requiring  return  receipt,  (c)  by  overnight  courier,  or  (d)  by  e-mail  with  delivery  and  return
receipts  requested  and  confirmation  of  delivery  thereafter,  to  the  Party  to  be  notified  at  its  address(es)  given  below,  or  at  any
address such Party may designate by prior written notice to the other.  Notice shall be deemed sufficiently given for all purposes
upon  the  earliest  of:  (i)  the  date  of  actual  receipt;  (ii)  if  air  mailed,  [***]  days  after  the  date  of  postmark;  (iii)  if  delivered  by
overnight courier, the next day the overnight courier regularly makes deliveries or (iv) if sent by e-mail, the date of confirmation
of receipt.

If to Spero:

Spero Therapeutics, Inc.
675 Massachusetts Avenue, 14th Floor
Cambridge MA 02139
Attention:   Ankit Mahadevia, President and CEO
Email: [***]

with a copy (which shall not constitute notice) to:

Mintz Levin Cohn Ferris Glovsky and Popeo, P.C.
One Financial Center, 40th Floor
Boston, MA 02111
Attention:  Lewis J. Geffen
Email:  [***]

If to Everest:

F66, Tower 1, Plaza 66
West Nanjing Road 1266
Shanghai 200040, PRC
Attention: George Qiao
Fax: [***]

With a copy to:

Morrison & Foerster
Suite 4401, HKRI Centre One, HKRI Taikoo Hui
288 Shimen Road (No. 1)
Shanghai 200041, P.R. China
Attention:  Chuan Sun
Facsimile: [***]

77

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
 
 
15.10

Dispute Resolution.

(a)

Except as provided in Section 4.3(a) or Excluded Claims as set forth in subsection 15.10(g) below,
if a dispute arises within the JDC with respect to any decision under the jurisdiction of the JDC that remains unresolved pursuant
to Section 4.3 (JDC Decision-Making) or otherwise between the Parties in connection with or relating to this Agreement or any
document  or  instrument  delivered  in  connection  herewith  (collectively,  a  “Dispute”),  then  either  Party  shall  have  the  right  to
refer such Dispute to the Senior Officers for attempted resolution by good faith negotiations during a period of [***] Business
Days.  Any final decision mutually agreed to in writing by the Senior Officers shall be conclusive and binding on the Parties.

(b)

The Senior Officers shall negotiate in good faith and use reasonable efforts to settle any Dispute
arising  from  or  related  to  this  Agreement  or  the  breach  thereof  within  such  [***]  Business-Day  period.    Subject  to
Section 15.10(h) (Dispute Resolution - subsection (h)), in the event the Senior Officers cannot fully resolve or settle such Dispute
within such period, and a Party wishes to pursue the matter further, each such Dispute that is not an Excluded Claim (defined in
Section 15.10(g) (Dispute Resolution - subsection (g)) below) shall be finally resolved by binding arbitration administered by the
[***] arbitration rules then in effect.

(c)

The  arbitration  shall  be  conducted  by  a  panel  of  [***]  neutral  arbitrators  experienced  in  the
pharmaceutical business, none of whom shall be a current or former employee or director, or a current stockholder, of either Party
or any of their respective Affiliates or any Sublicensee.  Within [***] days after initiation of arbitration, each Party shall select
[***] person to act as arbitrator and the [***] Party-selected arbitrators shall select a [***] arbitrator within [***] days of their
appointment.  If the arbitrators selected by the Parties are unable or fail to agree upon the [***] arbitrator, the [***] arbitrator
shall be appointed by [***] (or its successor entity) in accordance with the then-current [***] arbitration rules, except as modified
in this Agreement.  The place of arbitration shall be in [***], and all proceedings and communications shall be in English.  The
procedures for the taking of evidence shall be governed by the [***]. The decision or award rendered by the Arbitrators shall be
final, binding, conclusive and non-appealable, and judgment may be entered upon it in accordance with Applicable Laws in the
[***] or any other court of competent jurisdiction.  

(d)

Either Party may apply to the arbitrators for interim injunctive relief until the arbitration award is
rendered or the controversy is otherwise resolved.  The arbitrators’ authority to award punitive or any other type of damages not
measured by a Party’s compensatory damages shall be subject to the limitation set forth in Section 14.5 (Special, Indirect and
Other Losses).  Each Party shall bear its own costs and expenses and attorneys’ fees and an equal share of the arbitrators’ fees
and any administrative fees of arbitration.

(e)

Except to the extent necessary to confirm or enforce an award or as may be required by law, neither
Party nor an arbitrator  may  disclose  the  existence,  content,  or  results  of  an  arbitration without the prior written consent of the
other Party.  In no event shall an arbitration be initiated after the date when commencement of a legal or equitable proceeding
based on the dispute, controversy or claim would be barred by the applicable [***] statute of limitations.

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

78

 
 
 
(f)

The Parties agree that, in the event of a dispute over the nature or quality of performance under this
Agreement, neither Party may terminate this Agreement until final resolution of the dispute through arbitration or other judicial
determination.  The Parties further agree that any payments made pursuant to this Agreement pending resolution of the dispute
shall be refunded if an arbitrator or court determines that such payments are not due.

As  used  in  this  Section,  the  term  “Excluded Claim”  means  a  dispute,  controversy  or  claim  that
concerns the construction, scope, validity, enforceability, inventorship or infringement of a patent, patent application, trademark
or copyright.

(g)

(h)

Nothing contained in this Agreement shall deny either Party the right to seek injunctive or other
equitable relief from a court of competent jurisdiction in the context of a bona fide emergency or prospective irreparable harm,
and  such  an  action  may  be  filed  and  maintained  notwithstanding  any  ongoing  discussions  between  the  Parties  or  any  ongoing
arbitration proceeding.  In addition, either Party may bring an action in any court of competent jurisdiction to resolve disputes
pertaining  to  the  construction,  scope,  validity,  enforceability,  inventorship  or  infringement  of  a  patent,  patent  application,
trademark or copyright, and no such claim shall be subject to arbitration pursuant to subsections (b) and (c) of this Section 15.10
(Dispute Resolution).  Both Parties agree to waive any requirement that the other (i) post a bond or other security as a condition
for obtaining any such relief; or (ii) show irreparable harm, balancing of harms, consideration of the public interest or inadequacy
of monetary damages as a remedy.

15.11

Performance by Affiliates.  Each Party may discharge any obligations and exercise any rights hereunder
through any of its Affiliates.  Each Party hereby guarantees the performance by its Affiliates of such Party’s obligations under
this  Agreement,  and  shall  cause  its  Affiliates  to  comply  with  the  provisions  of  this  Agreement  in  connection  with  such
performance.  Any breach by a Party’s Affiliate of any of such Party’s obligations under this Agreement shall be deemed a breach
by such Party, and the other Party may proceed directly against such Party without any obligation to first proceed against such
Party’s Affiliate.

15.12

Headings.    The  captions  to  the  several  Articles,  Sections  and  subsections  hereof  are  not  a  part  of  this

Agreement, but are merely for convenience to assist in locating and reading the several Articles and Sections hereof.

15.13

Waiver  of  Rule  of  Construction.    Each  Party  has  had  the  opportunity  to  consult  with  counsel  in
connection with the review, drafting and negotiation of this Agreement.  Accordingly, the rule of construction that any ambiguity
in this Agreement shall be construed against the drafting Party shall not apply.

15.14

Business Day Requirements.  In the event that any notice or other action or omission is required to be
taken by a Party under this Agreement on a day that is not a Business Day then such notice or other action or omission shall be
deemed to require to be taken on the next occurring Business Day.

15.15

English Language.  This Agreement has been prepared in the English language, and the English language

shall control its interpretation.  In addition, all notices required or

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

79

 
 
 
permitted  to  be  given  hereunder,  and  all  written,  electronic,  oral  or  other  communications  between  the  Parties  regarding  this
Agreement shall be in the English language

15.16

No  Benefit  to  Third  Parties.    Except  as  provided  in  ARTICLE  14  (Indemnification;  Liability),  the
covenants  and  agreements  set  forth  in  this  Agreement  are  for  the  sole  benefit  of  the  Parties  hereto  and  their  successors  and
permitted assigns and they shall not be construed as conferring any rights on any other Persons.

15.17

Further  Assurances.    Each  Party  shall  duly  execute  and  deliver,  or  cause  to  be  duly  executed  and
delivered,  such  further  instruments  and  do  and  cause  to  be  done  such  further  acts  and  things,  including  the  filing  of  such
assignments,  agreements,  documents  and  instruments,  as  may  be  necessary  or  as  the  other  Party  may  reasonably  request  in
connection  with  this  Agreement  or  to  carry  out  more  effectively  the  provisions  and  purposes  hereof  or  to  better  assure  and
confirm unto such other Party its rights and remedies under this Agreement.

15.18

Counterparts.    This  Agreement  may  be  executed  in  two  or  more  counterparts,  each  of  which  shall  be

deemed an original, but all of which together shall constitute one and the same instrument

{Remainder of page intentionally left blank}

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

80

 
 
 
 
IN  WITNESS  WHEREOF,  the  Parties  intending  to  be  bound  have  caused  this  Agreement  to  be  executed  by  their  duly

authorized representatives.

Everest Medicines II Limited

Spero Therapeutics, Inc.

By:
Name:
Title:
Date:

 /s/ Kerry Levan Blanchard
 Kerry Levan Blanchard
 CEO
 07-Jan-2021

By:
Name:
Title:
Date:

 /s/ Ankit Mahadevia
 Ankit Mahadevia
 CEO
 1/15/2021

Solely for the purpose of Section 3.3(e)

Spero Potentiator, Inc.

By:
Name:
Title:
Date:

 /s/ Ankit Mahadevia
 Ankit Mahadevia
 CEO
 1/15/2021

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

81

 
 
 
 
  
 
 
  
 
  
 
 
  
 
 
 
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
  
 
 
  
 
 
  
 
  
 
 
  
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
LIST OF EXHIBITS

Exhibit A:

Assigned Patents Existing as of the Amendment Effective Date

Reference

Territory

Application No.

Publication No.

Status

Filing Date

Assignee

[***]

[***]

[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

[***]

[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

82

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
 
 
Exhibit B:

Spero Trademarks

Spero Reference
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Mark
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Country
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Classes
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Appl. Date
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Reg. No.
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Reg. Date
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Appl. No.
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

Status
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]
[***]

83

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
 
 
Exhibit C:

SPR206

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

84

 
 
 
 
 
 
Exhibit D:

SPR741

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

85

 
 
 
 
 
 
 
 
Exhibit E: Development Plan as of Amendment Effective Date

[***]

86

[***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN
OMITTED BECAUSE THE INFORMATION (I) IS NOT MATERIAL AND (II) WOULD BE COMPETITIVELY HARMFUL IF PUBLICLY
DISCLOSED.

 
 
 
 
 
Spero Therapeutics, Inc.
Shares of Common Stock
(par value $0.001 per share)

Controlled Equity OfferingSM

Sales Agreement

Exhibit 10.28

March 11, 2021

Cantor Fitzgerald & Co.
499 Park Avenue
New York, NY 10022

Ladies and Gentlemen:

Spero Therapeutics, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”)  with

Cantor Fitzgerald & Co. (the “Agent”), as follows:

1.

Issuance and Sale of Shares.  The Company agrees that, from time to time during the term of this Agreement,
on the terms and subject to the conditions set forth herein, it may issue and sell through the Agent, shares of common stock (the
“Placement Shares”) of the Company, par value $0.001 per share (the “Common Stock”); provided, however, that in no event
shall the Company issue or sell through the Agent such number or dollar amount of Placement Shares that would (a) exceed the
number  or  dollar  amount  of  shares  of  Common  Stock  registered  on  the  effective  Registration  Statement  (as  defined  below)
pursuant to which the offering is being made, (b) exceed the number of authorized but unissued shares of Common Stock (less
shares  of  Common  Stock  issuable  upon  exercise,  conversion  or  exchange  of  any  outstanding  securities  of  the  Company  or
otherwise reserved from the Company’s authorized capital stock), (c) exceed the number or dollar amount of shares of Common
Stock permitted to be sold under Form S-3 (including General Instruction I.B.6 thereof, if applicable) or (d) exceed the number or
dollar amount of shares of Common Stock for which the Company has filed a Prospectus Supplement (as defined below) (the
lesser of (a), (b), (c) and (d), the “Maximum Amount”).  Notwithstanding anything to the contrary contained herein, the parties
hereto agree that compliance with the limitations set forth in this Section 1 on the amount of Placement Shares issued and sold
under this Agreement shall be the sole responsibility of the Company and that the Agent shall have no obligation in connection
with such compliance.  The offer and sale of Placement Shares through the Agent will be effected pursuant to the Registration
Statement  filed  by  the  Company  and  which  will  be  declared  effective  by  the  Securities  and  Exchange  Commission  (the
“Commission”),  although  nothing  in  this  Agreement  shall  be  construed  as  requiring  the  Company  to  use  the  Registration
Statement to issue Common Stock.

The Company has filed or will file, in accordance with the provisions of the Securities Act of 1933, as amended (the
“Securities  Act”),  and  the  rules  and  regulations  thereunder  (the  “Securities  Act  Regulations”),  with  the  Commission  a
registration statement on Form S-3, including a base prospectus, relating to certain securities, including the Placement Shares to
be

 
 
 
 
issued from time to time by the Company, and which incorporates by reference documents that the Company has filed or will file
in accordance with the provisions of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and
regulations thereunder (the “Exchange Act Regulations”).  The Company has prepared a prospectus or a prospectus supplement
to  the  base  prospectus  included  as  part  of  the  registration  statement,  which  prospectus  or  prospectus  supplement  relates  to  the
Placement Shares to be issued from time to time by the Company (the “Prospectus Supplement”).  The Company will furnish to
the Agent, for use by the Agent, copies of the prospectus included as part of such registration statement, as supplemented, by the
Prospectus Supplement, relating to the Placement Shares to be issued from time to time by the Company.  The Company may file
one  or  more  additional  registration  statements  from  time  to  time  that  will  contain  a  base  prospectus  and  related  prospectus  or
prospectus supplement, if applicable (which shall be a Prospectus Supplement), with respect to the Placement Shares.  Except
where the context otherwise requires, such registration statement(s), including all documents filed as part thereof or incorporated
by  reference  therein,  and  including  any  information  contained  in  a  Prospectus  (as  defined  below)  subsequently  filed  with  the
Commission pursuant to Rule 424(b) under the Securities Act Regulations or deemed to be a part of such registration statement
pursuant to Rule 430B of the Securities Act Regulations, is herein called the “Registration Statement.”  The base prospectus or
base prospectuses, including all documents incorporated therein by reference, included in the Registration Statement, as it may be
supplemented,  if  necessary,  by  the  Prospectus  Supplement,  in  the  form  in  which  such  prospectus  or  prospectuses  and/or
Prospectus Supplement have most recently been filed by the Company with the Commission pursuant to Rule 424(b) under the
Securities Act Regulations, together with the then issued Issuer Free Writing Prospectus(es) (as defined below), is herein called
the “Prospectus.”  

Any reference herein to the Registration Statement, any Prospectus Supplement, Prospectus or any Issuer Free Writing
Prospectus shall be deemed to refer to and include the documents, if any, incorporated by reference therein (the “Incorporated
Documents”),  including,  unless  the  context  otherwise  requires,  the  documents,  if  any,  filed  as  exhibits  to  such  Incorporated
Documents.  Any  reference  herein  to  the  terms  “amend,”  “amendment”  or  “supplement”  with  respect  to  the  Registration
Statement,  any  Prospectus  Supplement,  the  Prospectus  or  any  Issuer  Free  Writing  Prospectus  shall  be  deemed  to  refer  to  and
include  the  filing  of  any  document  under  the  Exchange  Act  on  or  after  the  most-recent  effective  date  of  the  Registration
Statement, or the date of the Prospectus Supplement, Prospectus or such Issuer Free Writing Prospectus, as the case may be, and
incorporated therein by reference.  For purposes of this Agreement, all references to the Registration Statement, the Prospectus or
to any amendment or supplement thereto shall be deemed to include the most recent copy filed with the Commission pursuant to
its Electronic Data Gathering Analysis and Retrieval system, or if applicable, the Interactive Data Electronic Application system
when used by the Commission (collectively, “EDGAR”).

The  Company  and  the  Agent  hereby  agree  that,  effective  as  of  such  time  as  the  Commission  declares  effective  the
Registration  Statement  filed  by  the  Company  on  the  date  hereof,  the  Controlled  Equity  Offering  Sales  Agreement,  dated
December 3, 2018, by and between the Company and the Agent shall automatically terminate and be of no further force or effect,
other than those provisions set forth therein that survive termination of the Agreement pursuant to the terms thereof.

-2-

 
 
 
2.

Placements.    Each  time  that  the  Company  wishes  to  issue  and  sell  Placement  Shares  hereunder  (each,  a
“Placement”),  it  will  notify  the  Agent  by  email  notice  (or  other  method  mutually  agreed  to  by  the  parties)  of  the  number  of
Placement  Shares  to  be  issued,  the  time  period  during  which  sales  are  requested  to  be  made,  any  limitation  on  the  number  of
Placement Shares that may be sold in any one day and any minimum price below which sales may not be made (a “Placement
Notice”), the form of which is attached hereto as Schedule 1.  The Placement Notice shall originate from any of the individuals
from  the  Company  set  forth  on  Schedule  3  (with  a  copy  to  each  of  the  other  individuals  from  the  Company  listed  on  such
schedule), and shall be addressed to each of the individuals from the Agent set forth on Schedule 3, as such Schedule 3 may be
amended from time to time.  The Placement Notice shall be effective unless and until (i) the Agent declines to accept the terms
contained therein for any reason, in its sole discretion, provided the Agent delivers written notice thereof to the Company within
two (2) Business Days (as defined below) after receipt of such Placement Notice, (ii) the entire amount of the Placement Shares
thereunder  have  been  sold,  (iii)  the  Company  suspends  or  terminates  the  Placement  Notice  or  (iv)  this  Agreement  has  been
terminated under the provisions of Section 12.  The amount of any discount, commission or other compensation to be paid by the
Company to the Agent in connection with the sale of the Placement Shares shall be calculated in accordance with the terms set
forth in Schedule 2.  It is expressly acknowledged and agreed that neither the Company nor the Agent will have any obligation
whatsoever with respect to a Placement or any Placement Shares unless and until the Company delivers a Placement Notice to the
Agent and the Agent does not decline such Placement Notice pursuant to the terms set forth above, and then only upon the terms
specified therein and herein.  In the event of a conflict between the terms of this Agreement and the terms of a Placement Notice,
the terms of the Placement Notice will control.

3.

Sale of Placement Shares by the Agent.  Subject to the provisions of Section 5(a), the Agent, for the period
specified  in  the  Placement  Notice,  will  use  its  commercially  reasonable  efforts  consistent  with  its  normal  trading  and  sales
practices  and  applicable  state  and  federal  laws,  rules  and  regulations  and  the  rules  of  the  Nasdaq  Global  Select  Market  (the
“Exchange”), to sell the Placement Shares up to the amount specified in, and otherwise in accordance with the terms of, such
Placement Notice.  The Agent will provide written confirmation to the Company no later than the opening of the Trading Day (as
defined below) immediately following the Trading Day on which it has made sales of Placement Shares hereunder setting forth
the number of Placement Shares sold on such day, the compensation payable by the Company to the Agent pursuant to Section 2
with  respect  to  such  sales,  and  the  Net  Proceeds  (as  defined  below)  payable  to  the  Company,  with  an  itemization  of  the
deductions made by the Agent (as set forth in Section 5(b)) from the gross proceeds that it receives from such sales.  Subject to
the terms of the Placement Notice, the Agent may sell Placement Shares by any method permitted by law deemed to be an “at the
market offering” as defined in Rule 415(a)(4) of the Securities Act Regulations, including sales made directly on or through the
Exchange or any other existing trading market for the Common Stock, in negotiated transactions at market prices prevailing at
the time of sale or at prices related to such prevailing market prices and/or any other method permitted by law.  “Trading Day”
means any day on which Common Stock is traded on the Exchange.  While a Placement Notice is in effect, neither the Agent nor
any  of  its  subsidiaries  shall,  for  its  own  account,  engage  in  (i)  any  short  sale  of  any  security  of  the  Company,  as  defined  in
Regulation SHO under the Exchange Act, or (ii) any market making bidding, stabilization or other trading activity with regard to
the Common Stock or related derivative securities, in each

-3-

 
 
 
case, if such activity would be prohibited under Regulation M under the Exchange Act or other anti-manipulation rules under the
Securities Act. For the avoidance of doubt, this restriction shall not apply to transactions by or on behalf of any customer of the
Agent or transactions by the Agent to facilitate any such transactions by or on behalf of any customer of the Agent.

4.

Suspension of Sales.  The Company or the Agent may, upon notice to the other party in writing (including by
email correspondence to each of the individuals of the other party set forth on Schedule 3, if receipt of such correspondence is
actually acknowledged by any of the individuals to whom the notice is sent, other than via auto-reply) or by telephone (confirmed
immediately by verifiable facsimile transmission or email correspondence to each of the individuals of the other party set forth on
Schedule 3), suspend any sale of Placement Shares (a “Suspension”); provided, however, that such Suspension shall not affect or
impair any party’s obligations with respect to any Placement Shares sold hereunder prior to the receipt of such notice.  While a
Suspension is in effect, any obligation under Sections 7(l), 7(m), and 7(n) with respect to the delivery of certificates, opinions, or
comfort letters to the Agent, shall be waived. Each of the parties agrees that no such notice under this Section 4 shall be effective
against any other party unless it is made to one of the individuals named on Schedule 3 hereto, as such Schedule may be amended
from time to time.

5.

Sale and Delivery to the Agent; Settlement.

(a)

Sale of Placement Shares. On the basis of the representations and warranties herein contained and
subject to the terms and conditions herein set forth, upon the Agent’s acceptance of the terms of a Placement Notice, and unless
the sale of the Placement Shares described therein has been declined, suspended, or otherwise terminated in accordance with the
terms of this Agreement, the Agent, for the period specified in the Placement Notice, will use its commercially reasonable efforts
consistent with its normal trading and sales practices and applicable law and regulations to sell such Placement Shares up to the
amount  specified,  and  otherwise  in  accordance  with  the  terms  of  such  Placement  Notice.    The  Company  acknowledges  and
agrees that (i) there can be no assurance that the Agent will be successful in selling Placement Shares, (ii) the Agent will incur no
liability or obligation to the Company or any other person or entity (“Person”) if it does not sell Placement Shares for any reason
other than a failure by the Agent to use its commercially reasonable efforts consistent with its normal trading and sales practices
and applicable law and regulations to sell such Placement Shares as required under this Agreement and (iii) the Agent shall be
under no obligation to purchase Placement Shares on a principal basis pursuant to this Agreement, except as otherwise agreed by
the Agent and the Company.

(b)

Settlement  of  Placement  Shares.  Unless  otherwise  specified  in  the  applicable  Placement  Notice,
settlement for sales of Placement Shares will occur on the second (2nd) Trading Day (or such earlier day as is industry practice
for regular-way trading) following the date on which such sales are made (each, a “Settlement Date”).  The Agent shall notify
the Company of each sale of Placement Shares no later than the opening of the Trading Day immediately following the Trading
Day on which it has made sales of Placement Shares hereunder.  The amount of proceeds to be delivered to the Company on a
Settlement  Date  against  receipt  of  the  Placement  Shares  sold  (the  “Net  Proceeds”)  will  be  equal  to  the  aggregate  sales  price
received by the Agent, after deduction for (i) the Agent’s commission, discount or other

-4-

 
 
 
compensation for such sales payable by the Company pursuant to Section 2 hereof, and (ii) any transaction fees imposed by any
Governmental Authority (as defined below) in respect of such sales.

(c)

  Delivery  of  Placement  Shares.    On  or  before  each  Settlement  Date,  the  Company  will,  or  will
cause  its  transfer  agent  to,  electronically  transfer  the  Placement  Shares  being  sold  by  crediting  the  Agent’s  or  its  designee’s
account (provided the Agent shall have given the Company written notice of such designee at least one Trading Day prior to the
Settlement Date) at The Depository Trust Company through its Deposit and Withdrawal at Custodian system or by such other
means of delivery as may be mutually agreed upon by the parties hereto which in all cases shall be freely tradable, transferable,
registered shares in good deliverable form.  On each Settlement Date, the Agent will deliver the related Net Proceeds in same day
funds to an account designated by the Company on, or prior to, the Settlement Date.  The Company agrees that if the Company,
or its transfer agent (if applicable), defaults in its obligation to deliver Placement Shares on a Settlement Date, through no fault of
the Agent, the Company agrees that in addition to and in no way limiting the rights and obligations set forth in Section  10(a)
hereto,  it  will  (i)  hold  the  Agent  harmless  against  any  loss,  claim,  damage,  or  reasonable  documented  expense  (including
reasonable documented legal fees and expenses), as incurred, arising out of or in connection with such default by the Company or
its  transfer agent (if  applicable)  and  (ii)  pay  to  the  Agent  any  commission,  discount, or other compensation to which it would
otherwise have been entitled absent such default.

(d)

Denominations;  Registration.    Certificates  for  the  Placement  Shares,  if  any,  shall  be  in  such
denominations  and  registered  in  such  names  as  the  Agent  may  request  in  writing  at  least  one  full  Business  Day  before  the
Settlement Date.  The certificates for the Placement Shares, if any, will be made available by the Company for examination and
packaging  by  the  Agent  in  The  City  of  New  York  not  later  than  noon  (New  York  time)  on  the  Business  Day  prior  to  the
Settlement Date.

(e)

Limitations  on  Offering  Size.    Under  no  circumstances  shall  the  Company  cause  or  request  the
offer  or  sale  of  any  Placement  Shares  if,  after  giving  effect  to  the  sale  of  such  Placement  Shares,  the  aggregate  gross  sales
proceeds of Placement Shares sold pursuant to this Agreement would exceed the lesser of (A) together with all sales of Placement
Shares  under  this  Agreement,  the  Maximum  Amount  and  (B)  the  amount  authorized  from  time  to  time  to  be  issued  and  sold
under this Agreement by the Company’s board of directors, a duly authorized committee thereof or a duly authorized executive
committee, and notified to the Agent in writing.  Under no circumstances shall the Company cause or request the offer or sale of
any Placement Shares pursuant to this Agreement at a price lower than the minimum price authorized from time to time by the
Company’s board of directors, a duly authorized committee thereof or a duly authorized executive committee, and notified to the
Agent  in  writing.    Further,  under  no  circumstances  shall  the  Company  cause  or  permit  the  aggregate  offering  amount  of
Placement Shares sold pursuant to this Agreement to exceed the Maximum Amount.

-5-

 
 
 
6.

Representations and Warranties of the Company.  The Company represents and warrants to, and agrees with

the Agent that as of the date of this Agreement and as of each Applicable Time (as defined below):

(a)

Registration  Statement  and  Prospectus.    Each  of  the  Registration  Statement  and  any  amendment
thereto  has  or  will  become  effective  under  the  Securities  Act.    No  stop  order  suspending  the  effectiveness  of  the  Registration
Statement or any post-effective amendment thereto has been issued under the Securities Act, no order preventing or suspending
the use of the Prospectus has been issued and no proceedings for any of those purposes have been instituted or are pending or, to
the Company’s knowledge, contemplated by the Commission.  The Company has complied or will comply with each request (if
any)  from  the  Commission  for  additional  information.  Each  of  the  Registration  Statement  and  any  post-effective  amendment
thereto, at the time it became or will become effective, complied or will comply in all material respects with the requirements of
the  Securities  Act  and  the  Securities  Act  Regulations.   The  Prospectus  and  any  amendment  or  supplement  thereto,  at  the  time
each was filed with the Commission, complied or will comply in all material respects with the requirements of the Securities Act
and the Securities Act Regulations.  The Prospectus was or will be identical to the electronically transmitted copies thereof filed
with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(b)

Accurate  Disclosure.    Neither  the  Registration  Statement  nor  any  amendment  thereto,  when  it
became or becomes effective, contained, contains or will contain an untrue statement of a material fact or omitted, omits or will
omit  to  state  a  material  fact  required  to  be  stated  therein  or  necessary  to  make  the  statements  therein  not  misleading.   At  the
Applicable Time, none of (i) the Registration Statement, (ii) the Prospectus or (iii) any Issuer Free Writing Prospectus, included,
includes or will include an untrue statement of a material fact or omitted, omits or will omit to state a material fact necessary in
order to make the statements therein, in the light of the circumstances under which they were made, not misleading.  Neither the
Prospectus nor any amendment or supplement thereto, as of its issue date, at the time of any filing with the Commission pursuant
to  Rule  424(b),  as  of  the  date  hereof  or  at  the  Applicable  Time,  included,  includes  or  will  include  an  untrue  statement  of  a
material fact or omitted, omits or will omit to state a material fact necessary in order to make the statements therein, in the light
of the circumstances under which they were made, not misleading. The representations and warranties in this subsection shall not
apply  to  statements  in  or  omissions  from  the  Registration  Statement  (or  any  amendment  thereto)  or  the  Prospectus  (or  any
amendment or supplement thereto) made in reliance upon and in conformity with written information furnished to the Company
by the Agent expressly for use therein.  For purposes of this Agreement, the only information so furnished shall be the statements
set forth in the seventh and eighth paragraphs under the caption “Plan of Distribution” in the Prospectus (collectively, the “Agent
Information”).

the information contained in the Registration Statement or the Prospectus.

(c)

Issuer Free Writing Prospectuses. No Issuer Free Writing Prospectus conflicts or will conflict with

effective amendment thereto, at the earliest time thereafter that the

(d)

Company  Not  Ineligible  Issuer.   At  the  time  of  filing  the  Registration  Statement  and  any  post-

-6-

 
 
 
Company  or  another  offering  participant  made  a  bona  fide  offer  (within  the  meaning  of  Rule  164(h)(2)  of  the  Securities  Act
Regulations) of the Placement Shares and at the date hereof, the Company was not and is not an “ineligible issuer,” as defined in
Rule 405, without taking account of any determination by the Commission pursuant to Rule 405 that it is not necessary that the
Company be considered an ineligible issuer.

(e)

Emerging  Growth  Company  Status.    From  the  time  of  the  initial  submission  of  the  Registration
Statement  to  the  Commission  (or,  if  earlier,  the  first  date  on  which  the  Company  engaged  directly  or  through  any  Person
authorized to act on its behalf in any oral or written communication with potential investors undertaken in reliance on Section
5(d) of the Securities Act) through the date hereof, the Company has been and is an “emerging growth company,” as defined in
Section 2(a) of the Securities Act (an “Emerging Growth Company”).

(f)

Independent Accountants.   The accountants who  certified  the  financial  statements  and  supporting
schedules  included  in  the  Registration  Statement  and  the  Prospectus  are  independent  public  accountants  with  respect  to  the
Company as required by the Securities Act, the Securities Act Regulations, the Exchange Act, the Exchange Act Regulations and
the Public Company Accounting Oversight Board.

(g)

Financial  Statements.    The  financial  statements  included  in  the  Registration  Statement  and  the
Prospectus,  together  with  the  related  schedules  and  notes,  present  fairly,  in  all  material  respects,  the  financial  position  of  the
Company and its consolidated subsidiaries at the dates indicated and the statement of operations, stockholders’ equity and cash
flows of the Company and its consolidated subsidiaries for the periods specified; said financial statements have been prepared in
conformity with U.S. generally accepted accounting principles (“GAAP”) applied on a consistent basis throughout the periods
involved, except in the case of unaudited financial statements, subject to normal year-end audit adjustments and the exclusion of
certain footnotes as permitted by the applicable rules of the Commission.  The supporting schedules, if any, present fairly, in all
material respects, in accordance with GAAP the information required to be stated therein.  The selected financial data and the
summary financial information included in the Registration Statement and the Prospectus present fairly, in all material respects,
the information shown therein and have been compiled on a basis consistent with that of the audited financial statements included
therein.  Except as included therein, no historical or pro forma financial statements or supporting schedules are required to be
included or incorporated by reference in the Registration Statement or the Prospectus under the Securities Act, the Securities Act
Regulations, the Exchange Act or the Exchange Act Regulations.

(h)

No Material Adverse Change in Business.  Except as otherwise stated therein, since the respective
dates as of which information is given in the Registration Statement, the Prospectus or the Issuer Free Writing Prospectuses, if
any (including any document deemed incorporated by reference therein), (A) there has been no material adverse change in the
condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company and its Subsidiaries
(as defined below) considered as one enterprise, whether or not arising in the ordinary course of business (a “Material Adverse
Effect”),  (B)  there  have  been  no  transactions  entered  into  by  the  Company  or  any  of  its  Subsidiaries,  other  than  those  in  the
ordinary course of business, which are material with respect to the Company and its Subsidiaries

-7-

 
 
 
considered  as  one  enterprise,  and  (C)  there  has  been  no  dividend  or  distribution  of  any  kind  declared,  paid  or  made  by  the
Company on any class of its capital stock.

(i)

Good Standing of the Company.  The Company has been duly incorporated and is validly existing
as a corporation in good standing under the laws of the State of Delaware and has corporate power and authority to own, lease
and operate its properties and to conduct its business as described in the Registration Statement and the Prospectus and to enter
into  and  perform  its  obligations  under  this  Agreement;  and  the  Company  is  duly  qualified  as  a  foreign  corporation  to  transact
business  and  is  in  good  standing  in  each  other  jurisdiction  in  which  such  qualification  is  required,  whether  by  reason  of  the
ownership  or  leasing  of  property  or  the  conduct  of  business,  except  where  the  failure  so  to  qualify  or  to  be  in  good  standing
would not result in a Material Adverse Effect.

(j)

Good  Standing  of  Subsidiaries.    Each  “significant  subsidiary”  of  the  Company  (as  such  term  is
defined in Rule 1-02 of Regulation S-X) (each, a “Subsidiary” and, collectively, the “Subsidiaries”) has been duly organized
and is validly existing in good standing under the laws of the jurisdiction of its incorporation or organization, has corporate or
similar power and authority to own, lease and operate its properties and to conduct its business as described in the Registration
Statement and the Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which such
qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the
failure to so qualify or to be in good standing would not result in a Material Adverse Effect.  Except as otherwise disclosed in the
Registration  Statement  and  the  Prospectus,  all  of  the  issued  and  outstanding  capital  stock  of  each  Subsidiary  has  been  duly
authorized and validly issued, is fully paid and non‑assessable and is owned by the Company, directly or through Subsidiaries,
free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity.  None of the outstanding shares of
capital  stock  of  any  Subsidiary  were  issued  in  violation  of  the  preemptive  or  similar  rights  of  any  securityholder  of  such
Subsidiary.  The only subsidiaries of the Company are the subsidiaries listed on Exhibit 21 to the Registration Statement.

(k)

Capitalization.  The Company has an authorized, issued and outstanding capitalization as set forth
in  the  Registration  Statement  and  the  Prospectus  as  of  the  dates  referred  to  therein  (except  for  subsequent  issuances,  if  any,
pursuant to reservations, agreements or employee benefit plans referred to in the Registration Statement and the Prospectus or
pursuant to the exercise of convertible securities or options referred to in the Registration Statement and the Prospectus).  The
outstanding  shares  of  capital  stock  of  the  Company  have  been  duly  authorized  and  validly  issued  and  are  fully  paid  and
non‑assessable.  None of the outstanding shares of capital stock of the Company were issued in violation of the preemptive or
other similar rights of any securityholder of the Company.

the Company.

(l)

Authorization of Agreement.  This Agreement has been duly authorized, executed and delivered by

(m)

Authorization  and  Description  of  Placement  Shares.    The  Placement  Shares,  when  issued  and
delivered pursuant to the terms approved by the board of directors of the Company or a duly authorized committee thereof, or a
duly  authorized  executive  committee,  against  payment  therefor  as  provided  herein,  will  be  duly  authorized,  validly  issued  and
fully

-8-

 
 
 
paid and non‑assessable; and the issuance of the Placement Shares will not be subject to the preemptive or other similar rights of
any securityholder of the Company that have not been duly and validly waived.  The Common Stock conforms, in all material
respects,  to  all  statements  relating  thereto  contained  in  the  Registration  Statement  and  the  Prospectus  and  such  description
conforms, in all material respects, to the rights set forth in the instruments defining the same.  No holder of Placement Shares will
be subject to personal liability solely by reason of being such a holder.

(n)

Registration Rights.   There  are  no  persons  with  registration  rights  or  other  similar  rights  to  have
any securities registered for sale pursuant to the Registration Statement or otherwise registered for sale or sold by the Company
under  the  Securities  Act  pursuant  to  this  Agreement,  other  than  those  rights  that  have  been  disclosed  in  the  Registration
Statement and the Prospectus and have been waived.

(o)

Absence of Violations, Defaults and Conflicts.  Neither the Company nor any of its Subsidiaries is
(i) in violation of its charter, by-laws or similar organizational document, (ii) in default in the performance or observance of any
obligation,  agreement,  covenant  or  condition  contained  in  any  contract,  indenture,  mortgage,  deed  of  trust,  loan  or  credit
agreement, note, lease or other agreement or instrument to which the Company or any of its Subsidiaries is a party or by which it
or any of them is bound or to which any of the properties or assets of the Company or any Subsidiary is subject (collectively,
“Agreements  and  Instruments”),  except  for  such  defaults  that  would  not,  singly  or  in  the  aggregate,  result  in  a  Material
Adverse Effect, or (iii) in violation of any law, statute, rule, regulation, judgment, order, writ or decree of any arbitrator, court,
governmental  body,  regulatory  body,  administrative  agency  or  other  authority,  body  or  agency  having  jurisdiction  over  the
Company or any of its Subsidiaries or any of their respective properties, assets or operations (each, a “Governmental Entity”),
except for such violations that would not, singly or in the aggregate, result in a Material Adverse Effect.  The execution, delivery
and  performance  of  this  Agreement  and  the  consummation  of  the  transactions  contemplated  herein  and  in  the  Registration
Statement and the Prospectus (including the issuance and sale of the Placement Shares and the use of the proceeds from the sale
of  the  Placement  Shares  as  described  therein  under  the  caption  “Use  of  Proceeds”)  and  compliance  by  the  Company  with  its
obligations  hereunder  have  been  duly  authorized  by  all  necessary  corporate  action  and  do  not  and  will  not,  whether  with  or
without the giving of notice or passage of time or both, conflict with or constitute a breach of, or default or Repayment Event (as
defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any properties or assets of
the  Company  or  any  Subsidiary  pursuant  to,  the  Agreements  and  Instruments  (except  for  such  conflicts,  breaches,  defaults  or
Repayment  Events  or  liens,  charges  or  encumbrances  that  would  not,  singly  or  in  the  aggregate,  result  in  a  Material  Adverse
Effect), nor will such action result in any violation of the provisions of the charter, by-laws or similar organizational document of
the Company or any of its Subsidiaries or any law, statute, rule, regulation, judgment, order, writ or decree of any Governmental
Entity.  As used herein, a “Repayment Event” means any event or condition which gives the holder of any note, debenture or
other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or
repayment of all or a portion of such indebtedness by the Company or any of its Subsidiaries.

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(p)

Absence  of  Labor  Dispute.    No  labor  dispute  with  the  employees  of  the  Company  or  any  of  its
Subsidiaries exists or, to the knowledge of the Company, is imminent, and the Company is not aware of any existing or imminent
labor disturbance by the employees of any of its or any Subsidiary’s principal suppliers, manufacturers, customers or contractors,
which, in either case, would result in a Material Adverse Effect.

(q)

Absence  of  Proceedings.    Except  as  disclosed  in  the  Registration  Statement  and  the  Prospectus,
there  is  no  action,  suit,  proceeding,  inquiry  or,  to  the  knowledge  of  the  Company,  investigation  before  or  brought  by  any
Governmental Entity now pending or, to the knowledge of the Company, threatened, against or affecting the Company or any of
its Subsidiaries, which would result in a Material Adverse Effect, or which would materially and adversely affect their respective
properties or assets or the consummation of the transactions contemplated in this Agreement or the performance by the Company
of its obligations hereunder; and the aggregate of all pending legal or governmental proceedings to which the Company or any
such Subsidiary is a party or of which any of their respective properties or assets is the subject which are not described in the
Registration Statement and the Prospectus, including ordinary routine litigation incidental to the business, would not result in a
Material Adverse Effect.

Accuracy of Exhibits.  There are no contracts or documents which are required to be described in
the  Registration  Statement  or  the  Prospectus  or  to  be  filed  as  exhibits  to  the  Registration  Statement  which  have  not  been  so
described and filed as required.

(r)

(s)

Absence  of  Further  Requirements.    No  filing  with,  or  authorization,  approval,  consent,  license,
order,  registration,  qualification  or  decree  of,  any  Governmental  Entity  is  necessary  or  required  for  the  performance  by  the
Company of its obligations hereunder, in connection with the offering, issuance or sale of the Placement Shares hereunder or the
consummation  of  the  transactions  contemplated  by  this  Agreement,  except  such  as  have  been  already  obtained  or  as  may  be
required under the Securities Act, the Securities Act Regulations, the rules of the Exchange, state securities laws or the rules of
Financial Industry Regulatory Authority (“FINRA”).

(t)

Possession  of  Licenses  and  Permits.    The  Company  and  its  Subsidiaries  possess  such  permits,
certificates, licenses, approvals, clearances, registrations, exemptions, consents and other authorizations issued by the appropriate
Governmental  Entities  necessary  to  conduct  the  business  now  operated  by  them  (collectively,  “Governmental  Licenses”),
including  without  limitation,  all  such  Governmental  Licenses  required  by  the  United  States  Food  and  Drug  Administration
(“FDA”)  or  any  component  thereof  and/or  by  any  other  U.S.,  state,  local  or  foreign  government  or  drug  regulatory  agency
(collectively, the “Regulatory Agencies”) except where the failure so to possess would not, singly or in the aggregate, result in a
Material Adverse Effect.  The Company and its Subsidiaries are in compliance with the terms and conditions of all Governmental
Licenses, except where the failure so to comply would not, singly or in the aggregate, result in a Material Adverse Effect.  All of
the Governmental Licenses are valid and in full force and effect, except when the invalidity of such Governmental Licenses or
the failure of such Governmental Licenses to be in full force and effect would not, singly or in the aggregate, result in a Material
Adverse Effect.  Each of the Company and its Subsidiaries has fulfilled and performed all of its material obligations with respect
to the Governmental Licenses and, to the

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Company’s  knowledge,  no  event  has  occurred  which  allows,  or  after  notice  or  lapse  of  time  would  allow,  revocation  or
termination thereof or results in any other material impairment of the rights of the holder of any Governmental License.  Neither
the Company nor any of its Subsidiaries has received any notice of proceedings relating to the revocation or modification of any
Governmental Licenses which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would result
in a Material Adverse Effect.

(u)

Title  to  Property.    The  Company  and  its  Subsidiaries  have  good  and  marketable  title  to  all  real
property  owned  by  them  and  good  title  to  all  other  properties  owned  by  them,  in  each  case,  free  and  clear  of  all  mortgages,
pledges,  liens,  security  interests,  claims,  restrictions  or  encumbrances  of  any  kind  except  such  as  (i)  are  described  in  the
Registration Statement and the Prospectus or (ii) do not, singly or in the aggregate, materially adversely affect the value of such
property and do not adversely interfere with the use made and proposed to be made of such property by the Company or any of
its Subsidiaries; and all of the leases and subleases material to the business of the Company and its Subsidiaries, considered as
one enterprise, and under which the Company or any of its Subsidiaries holds properties described in the Registration Statement
or the Prospectus, are in full force and effect, and neither the Company nor any such Subsidiary has any notice of any material
claim of any sort that has been asserted by anyone adverse to the rights of the Company or any Subsidiary under any of the leases
or  subleases  mentioned  above,  or  affecting  or  questioning  the  rights  of  the  Company  or  such  Subsidiary  to  the  continued
possession of the leased or subleased premises under any such lease or sublease.

(v)

Possession  of  Intellectual  Property.    The  Company  and  its  Subsidiaries  own  or  possess,  or  can
acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know‑how (including trade secrets
and  other  unpatented  and/or  unpatentable  proprietary  or  confidential  information,  systems  or  procedures),  trademarks,  service
marks,  trade  names  or  other  intellectual  property  (collectively,  “Intellectual  Property”)  necessary  for  the  conduct  of  their
respective businesses as currently conducted and as currently proposed to be conducted as disclosed in the Registration Statement
and  the  Prospectus,  now  operated  by  them,  and  neither  the  Company  nor  any  of  its  Subsidiaries  has  received  any  notice  or  is
otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of
any  facts  or  circumstances  which  would  render  any  Intellectual  Property  invalid  or  inadequate  to  protect  the  interest  of  the
Company or any of its Subsidiaries therein, and which infringement or conflict (if the subject of any unfavorable decision, ruling
or finding) or invalidity or inadequacy, singly or in the aggregate, would result in a Material Adverse Effect.

(w)

Regulatory Compliance.  Except as described in the Registration Statement and the Prospectus, the
Company  and  its  Subsidiaries:  (i)  within  the  last  five  (5)  years  have  not  received  any  Form  483,  notice  of  adverse  finding,
warning letter, untitled letter or other correspondence or written notice from any Regulatory Agency or any other Governmental
Entity  alleging  or  asserting  noncompliance  with  any  Healthcare  Laws  (as  defined  below)  or  the  terms  of  any  Governmental
Licenses,  except  in  each  case  as  would  not,  individually  or  in  the  aggregate,  have  a  Material  Adverse  Effect;  (ii)  have  not
received written notice of any claim, action, suit, proceeding, hearing, enforcement, investigation, arbitration or other action from
any Governmental Entity or third party alleging that any product operation or activity is in violation

-11-

 
 
 
of any Healthcare Laws or Governmental Licenses and have no knowledge that any such Governmental Entity or third party is
considering  any  such  claim,  litigation,  arbitration,  action,  suit,  investigation  or  proceeding,  except  in  each  case  as  would  not,
individually  or  in  the  aggregate,  have  a  Material  Adverse  Effect;  (iii)  (A)  have  filed,  obtained,  maintained  or  submitted  all
reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments as required by any
Healthcare Laws or Governmental Licenses, (B) except as would not, individually or in the aggregate, have a Material Adverse
Effect, all such reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments
were complete and correct and not misleading on the date filed (or were corrected or supplemented by a subsequent submission),
and (C) neither the Company nor its Subsidiaries is aware of any reasonable basis for any material liability with respect to such
filings; and (iv) have not, and to the knowledge of the Company, the Company’s officers, employees and agents have not, made
any untrue statement of a material fact or fraudulent statement to any Governmental Entity or failed to disclose a material fact
required to be disclosed to any Governmental Entity.

(x)

Preclinical  Studies  and  Clinical  Trials.    To  the  Company’s  knowledge,  the  descriptions  of  and
information  regarding  the  preclinical  studies  and  clinical  trials,  and  the  data  and  results  derived  therefrom,  contained  in  the
Registration  Statement  and  the  Prospectus  are  accurate  and  complete  in  all  material  respects  and  the  Company  and  its
Subsidiaries, after due inquiry, are not aware of any nonclinical studies, clinical trials, or other information that would reasonably
call into question the validity, completeness, or accuracy of any study, trial, results or data described in the Registration Statement
and the Prospectus when viewed in the context in which such studies, trials, results, or data are described therein. The studies and
trials  conducted  by  or  on  behalf  of  or  sponsored  by  the  Company  and  its  Subsidiaries  were  and,  if  still  pending,  are  being
conducted in all material respect in accordance with standard medical and scientific research procedures and all applicable laws,
including,  but  not  limited  to,  the  Federal  Food,  Drug  and  Cosmetic  Act  (the  “FDCA”)  and  its  applicable  implementing
regulations  at  21  C.F.R.  Parts  50,  54,  56,  58  and  312.    Except  to  the  extent  disclosed  in  the  Registration  Statement  and  the
Prospectus, no investigational new drug application submitted by or on behalf of the Company or its Subsidiaries with the FDA
has  been  terminated  or  suspended  by  the  FDA,  and  neither  the  FDA  nor  any  applicable  foreign  regulatory  agency  has
commenced, or, to the knowledge of the Company, threatened to initiate, any action to place a clinical hold order on, or otherwise
terminate,  delay  or  suspend,  any  proposed  or  ongoing  clinical  investigation  conducted  or  proposed  to  be  conducted  by  or  on
behalf of the Company or its Subsidiaries.

(y)

Compliance with Healthcare Laws.  The Company and its Subsidiaries have been in compliance in
all material respects with all applicable healthcare laws, rules and regulations, to the extent they apply to the Company and its
current activities, including, without limitation, (i) the FDCA (21 U.S.C. §§ 301 et seq.); (ii) all applicable foreign, federal, state
and local healthcare related fraud and abuse laws, including, without limitation, the federal Anti-kickback Statute (42 U.S.C. §
1320a-7b(b)), the civil False Claims Act (31 U.S.C. §§ 3729 et seq.), the criminal False Claims Law (42 U.S.C. § 1320a-7b(a)),
the  civil  monetary  penalties  law  (42  U.S.C.  §  1320a-7a),  the  exclusion  laws  (42  U.S.C.  §  1320a-7),  the  Physician  Payments
Sunshine Act (42 U.S.C. § 1320a-7h), all criminal laws relating to healthcare fraud and abuse, including but not limited to 18
U.S.C.  Sections  286,  287,  1035,  1347  and  1349,  the  healthcare  fraud  criminal  provisions  under  the  U.S.  Health  Insurance
Portability and Accountability Act of

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1996 (“HIPAA”) (42 U.S.C. §§1320d et seq.), the Medicare statute (Title XVIII of the Social Security Act), and the Medicaid
statute  (Title  XIX  of  the  Social  Security  Act);  (iii)  the  patient  privacy,  data  security  and  beach  notification  provisions  under
HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 (42 U.S.C. §§17921 et
seq.);  (iv)  comparable  state  and  local  laws;  and  (v)  the  regulations  promulgated  pursuant  to  such  laws  (collectively,  the
“Healthcare Laws”). Neither the Company nor any of its Subsidiaries, nor to the Company’s knowledge, their officers, directors,
employees,  agents,  have  engaged  in  activities  which  are,  as  applicable,  cause  for  false  claims  liability,  civil  penalties,  or
mandatory  or  permissive  exclusion  from  Medicare,  Medicaid,  or  any  other  state  or  federal  healthcare  program.  Neither  the
Company nor any of its Subsidiaries has received written notice or other correspondence of any claim, action, suit, audit, survey,
proceeding, hearing, enforcement, investigation, arbitration or other action (“Action”) from any court, arbitrator or Governmental
Entity or third party alleging that any product, operation or activity is in violation of any Healthcare Laws, and, to the Company’s
knowledge,  no  such  Action  is  threatened.  Neither  the  Company  nor  any  of  its  Subsidiaries  is  a  party  to  or  has  any  ongoing
reporting  obligations  pursuant  to  any  corporate  integrity  agreement,  deferred  prosecution  agreement,  monitoring  agreement,
consent  decree,  settlement  order,  plan  of  correction  or  similar  agreement  with  or  imposed  by  any  Governmental  Entity.
Additionally,  neither  the  Company  nor  any  of  its  Subsidiaries,  nor  any  of  their  employees,  officers  or  directors,  or  to  the
Company’s  knowledge,  agents,  is  or  has  been  excluded,  suspended  or  debarred  from  participation  in  any  U.S.  state  or  federal
healthcare  program  or  human  clinical  research  or,  to  the  knowledge  of  the  Company,  is  subject  to  a  governmental  inquiry,
investigation,  proceeding,  or  other  similar  action  that  could  reasonably  be  expected  to  result  in  debarment,  suspension,  or
exclusion.

(z)

Environmental  Laws.    Except  as  described  in  the  Registration  Statement  or  the  Prospectus  or
would not, singly or in the aggregate, result in a Material Adverse Effect, (i) neither the Company nor any of its Subsidiaries is in
violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any
judicial  or  administrative  interpretation  thereof,  including  any  judicial  or  administrative  order,  consent,  decree  or  judgment,
relating  to  pollution  or  protection  of  human  health,  the  environment  (including,  without  limitation,  ambient  air,  surface  water,
groundwater,  land  surface  or  subsurface  strata)  or  wildlife,  including,  without  limitation,  laws  and  regulations  relating  to  the
release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or
petroleum  products,  asbestos-containing  materials  or  mold  (collectively,  “Hazardous  Materials”)  or  to  the  manufacture,
processing,  distribution,  use,  treatment,  storage,  disposal,  transport  or  handling  of  Hazardous  Materials  (collectively,
“Environmental Laws”), (ii) the Company and its Subsidiaries have all permits, authorizations and approvals required for their
operations  under  any  applicable  Environmental  Laws  and  are  each  in  compliance  with  their  requirements,  (iii)  there  are  no
pending or, to the knowledge of the Company, threatened administrative, regulatory or judicial actions, suits, demands, demand
letters,  claims,  liens,  notices  of  noncompliance  or  violation,  investigations  or  proceedings  relating  to  any  Environmental  Law
against the Company or any of its Subsidiaries and (iv) to the knowledge of the Company, there are no events or circumstances
that would reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by
any  private  party  or  Governmental  Entity,  against  or  affecting  the  Company  or  any  of  its  Subsidiaries  relating  to  Hazardous
Materials or any Environmental Laws.

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(aa)

Accounting  Controls  and  Disclosure  Controls.    The  Company  and  each  of  its  Subsidiaries
maintain effective internal control  over  financial  reporting  (as  defined  under  Rule  13‑a15 and 15d‑15 under the Exchange Act
Regulations  and  a  system  of  internal  accounting  controls  sufficient  to  provide  reasonable  assurances  that  (i)  transactions  are
executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit
preparation of financial statements in conformity with GAAP and to maintain accountability for assets; (iii) access to assets is
permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets
is  compared  with  the  existing  assets  at  reasonable  intervals  and  appropriate  action  is  taken  with  respect  to  any
differences.  Except as described in the Registration Statement and the Prospectus, since the end of the Company’s most recent
audited fiscal year, there has been (A) no material weakness in the Company’s internal control over financial reporting (whether
or not remediated) and (B) no change in the Company’s internal control over financial reporting that has materially affected, or is
reasonably likely to materially adversely affect, the Company’s internal control over financial reporting. The Company and each
of its Subsidiaries maintain an effective system of disclosure controls and procedures (as defined in Rule 13a‑15 and Rule 15d‑15
under the Exchange Act Regulations) that are designed to ensure that information required to be disclosed by the Company in the
reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods
specified in the Commission’s rules and forms, and is accumulated and communicated to the Company’s management, including
its  principal  executive  officer  or  officers  and  principal  financial  officer  or  officers,  as  appropriate,  to  allow  timely  decisions
regarding disclosure.

(bb)

Compliance  with  the  Sarbanes-Oxley  Act.    There  is  and  has  been  no  failure  on  the  part  of  the
Company or any of the Company’s directors or officers, in their capacities as such, to comply in all material respects with any
provision of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith (the “Sarbanes-
Oxley Act”), including Section 402 related to loans and Sections 302 and 906 related to certifications.

(cc)

Payment  of  Taxes.    All  United  States  federal  income  tax  returns  of  the  Company  and  its
Subsidiaries required by law to be filed have been filed and all taxes shown by such returns or otherwise assessed, which are due
and  payable,  have  been  paid,  except  assessments  against  which  appeals  have  been  or  will  be  promptly  taken  and  as  to  which
adequate reserves have been provided. The United States federal income tax returns of the Company through the end of its most
recent  fiscal  year  have  been  settled  and  no  assessment  in  connection  therewith  has  been  made  against  the  Company.  The
Company and its Subsidiaries have filed all other tax returns that are required to have been filed by them pursuant to applicable
foreign, state, local or other law except insofar as the failure to file such returns would not result in a Material Adverse Effect,
and has paid all taxes due pursuant to such returns or pursuant to any assessment received by the Company and its Subsidiaries,
except for such taxes, if any, as are being contested in good faith and as to which adequate reserves have been established by the
Company. The charges, accruals and reserves on the books of the Company in respect of any income and corporation tax liability
for any years not finally determined are adequate to meet any assessments or re-assessments for additional income tax for any
years not finally determined, except to the extent of any inadequacy that would not result in a Material Adverse Effect.

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(dd)

Insurance.   The Company and  its  Subsidiaries  carry  or  are  entitled  to  the  benefits  of  insurance,
with financially sound and reputable insurers, in such amounts and covering such risks as is generally maintained by companies
of  established  repute  and  comparable  size  engaged  in  the  same  or  similar  business,  and  all  such  insurance  is  in  full  force  and
effect.  The Company has no reason to believe that it or any of its Subsidiaries will not be able (i) to renew its existing insurance
coverage as and when such policies expire or (ii) to obtain comparable coverage from similar institutions as may be necessary or
appropriate to conduct its business as now conducted and at a cost that would not result in a Material Adverse Effect.  Neither of
the Company nor any of its Subsidiaries has been denied any insurance coverage which it has sought or for which it has applied.

(ee)

Investment Company Act.  The Company is not required, and upon the issuance and sale of the
Placement  Shares  as  herein  contemplated  and  the  application  of  the  net  proceeds  therefrom  as  described  in  the  Registration
Statement and the Prospectus will not be required, to register as an “investment company” under the Investment Company Act of
1940, as amended (the “Investment Company Act”).

(ff)

Absence  of  Manipulation.    Neither  the  Company  nor,  to  the  knowledge  of  the  Company,  any
affiliate  of  the  Company  has  taken,  nor  will  the  Company  or  any  affiliate  take,  directly  or  indirectly,  any  action  which  is
designed, or would reasonably be expected, to cause or result in, or which constitutes, the stabilization or manipulation of the
price  of  any  security  of  the  Company  to  facilitate  the  sale  or  resale  of  the  Placement  Shares  or  to  result  in  a  violation  of
Regulation M under the Exchange Act.

(gg)

Foreign  Corrupt  Practices  Act.    None  of  the  Company,  any  of  its  Subsidiaries  or,  to  the
knowledge of the Company, any director, officer, agent, employee, affiliate or other person acting on behalf of the Company or
any of its Subsidiaries is aware of or has taken any action, directly or indirectly, that would result in a violation by such persons
of  the  Foreign  Corrupt  Practices  Act  of  1977,  as  amended,  and  the  rules  and  regulations  thereunder  (the  “FCPA”),  including,
without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an
offer,  payment,  promise  to  pay  or  authorization  of  the  payment  of  any  money,  or  other  property,  gift,  promise  to  give,  or
authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign
political party or official thereof or any candidate for foreign political office, in contravention of the FCPA and the Company and,
to the knowledge of the Company, its affiliates have conducted their businesses in compliance with the FCPA and have instituted
and  maintain  policies  and  procedures  designed  to  ensure,  and  which  are  reasonably  expected  to  continue  to  ensure,  continued
compliance therewith.

(hh)

Money Laundering Laws.  The operations of the Company and its Subsidiaries are and have been
conducted  at  all  times  in  compliance  with  applicable  financial  recordkeeping  and  reporting  requirements  of  the  Currency  and
Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules
and  regulations  thereunder  and  any  related  or  similar  rules,  regulations  or  guidelines,  issued,  administered  or  enforced  by  any
Governmental  Entity  (collectively,  the  “Money  Laundering  Laws”);  and  no  action,  suit  or  proceeding  by  or  before  any
Governmental Entity involving the

-15-

 
 
 
Company or any of its Subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company,
threatened.

(ii)

OFAC.  None of the Company, any of its Subsidiaries or, to the knowledge of the Company, any
director, officer, agent, employee, affiliate or representative of the Company or any of its Subsidiaries is a Person currently the
subject or target of any sanctions administered or enforced by the United States Government, including, without limitation, the
U.S. Department of the Treasury’s Office of Foreign Assets Control, the United Nations Security Council, the European Union,
Her Majesty’s Treasury, or other relevant sanctions authority (collectively, “Sanctions”), nor is the Company located, organized
or  resident  in  a  country  or  territory  that  is  the  subject  of  Sanctions;  and  the  Company  will  not  directly  or  indirectly  use  the
proceeds of the sale of the Placement Shares, or lend, contribute or otherwise make available such proceeds to any Subsidiaries,
joint venture partners or other Person, to fund any activities of or business with any Person, or in any country or territory, that, at
the  time  of  such  funding,  is  the  subject  of    Sanctions  or  in  any  other  manner  that  will  result  in  a  violation  by  any  Person
(including any Person participating in the transaction, whether as Agent, advisor, investor or otherwise) of Sanctions.

(jj)

Lending Relationship.  Except as disclosed in the Registration Statement and the Prospectus, the
Company (i) does not have any material lending or other relationship with any bank or lending affiliate of the Agent and (ii) does
not intend to use any of the proceeds from the sale of the Placement Shares to repay any outstanding debt owed to any affiliate of
the Agent.

(kk)

Statistical  and  Market-Related  Data.    Any  statistical  and  market-related  data  included  in  the
Registration  Statement  or  the  Prospectus  are  based  on  or  derived  from  sources  that  the  Company  believes,  after  reasonable
inquiry, to be reliable and accurate and, to the extent required, the Company has obtained the written consent to the use of such
data from such sources.

(ll)

Cybersecurity.  The Company and its Subsidiaries’ information technology assets and equipment,
computers,  systems,  networks,  hardware,  software,  websites,  applications,  and  databases  (collectively,  “IT  Systems”)  are
adequate for, and operate and perform in all material respects as required in connection with the operation of the business of the
Company  as  currently  conducted,  free  and  clear  of  all  material  bugs,  errors,  defects,  Trojan  horses,  time  bombs,  malware  and
other  corruptants.  The  Company  and  its  Subsidiaries  have  implemented  and  maintained  commercially  reasonable  physical,
technical  and  administrative  controls,  policies,  procedures,  and  safeguards  to  maintain  and  protect  their  material  confidential
information and the integrity, continuous operation, redundancy and security of all IT Systems and data, including all “Personal
Data”  (defined  below)  and  all  sensitive,  confidential  or  regulated  data  (“Confidential  Data”)  used  in  connection  with  their
businesses.    “Personal  Data”  means  (i)  a  natural  person’s  name,  street  address,  telephone  number,  e-mail  address,  photograph,
social  security  number  or  tax  identification  number,  driver’s  license  number,  passport  number,  credit  card  number,  bank
information, or customer or account number; (ii) any information which would qualify as “personally identifying information”
under  the  Federal  Trade  Commission  Act,  as  amended;  (iii)  “personal  data”  as  defined  by  the  European  Union  General  Data
Protection Regulation (“GDPR”); (iv) any information which would qualify as “protected

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health  information”  under  the  Health  Insurance  Portability  and  Accountability  Act  of  1996,  as  amended  by  the  Health
Information  Technology  for  Economic  and  Clinical  Health  Act  (collectively,  “HIPAA”);  (v)  any  “personal  information”  as
defined by the California Consumer Privacy Act (“CCPA”); and (vi) any other piece of information that allows the identification
of  such  natural  person,  or  his  or  her  family,  or  permits  the  collection  or  analysis  of  any  data  related  to  an  identified  person’s
health or sexual orientation. There have been no breaches, violations, outages or unauthorized uses of or accesses to same, except
for those that have been remedied without material cost or liability or the duty to notify any other person, nor any incidents under
internal review or, to the knowledge of the Company, investigations relating to the same. The Company and its Subsidiaries are
presently in material compliance with all applicable laws or statutes and all judgments, orders, rules and regulations of any court
or  arbitrator  or  governmental  or  regulatory  authority,  internal  policies  and  contractual  obligations  relating  to  the  privacy  and
security of IT Systems, Confidential Data, and Personal Data and to the protection of such IT Systems, Confidential Data, and
Personal Data from unauthorized use, access, misappropriation or modification.

(mm)

Compliance with Data Privacy Laws.    The  Company  and  its  Subsidiaries  are,  and  at  all  times
during the last three years were, in material compliance with all applicable state and federal data privacy and security laws and
regulations,  including  without  limitation  HIPAA,  CCPA,  and  GDPR  (EU  2016/679)  (collectively,  the  “Privacy  Laws”).  To
ensure  compliance  with  the  Privacy  Laws,  the  Company  has  in  place,  complies  with,  and  takes  appropriate  steps  to  ensure
compliance  in  all  material  respects  with  their  policies  and  procedures  relating  to  data  privacy  and  security  and  the  collection,
storage,  use,  processing,  disclosure,  handling,  and  analysis  of  Personal  Data  and  Confidential  Data  (the  “Policies”).  The
Company  has  at  all  times  made  all  disclosures  to  users  or  customers  required  by  applicable  laws  and  regulatory  rules  or
requirements,  and  none  of  such  disclosures  made  or  contained  in  any  Policy  have  been  inaccurate  or  in  violation  of  any
applicable laws and regulatory rules or requirements in any material respect. The Company further certifies that neither it nor any
Subsidiary: (i) has received notice of any actual or potential liability under or relating to, or actual or potential violation of, any of
the  Privacy  Laws,  and  has  no  knowledge  of  any  event  or  condition  that  would  reasonably  be  expected  to  result  in  any  such
notice; (ii) is currently conducting or paying for, in whole or in part, any investigation, remediation, or other corrective action
pursuant to any Privacy Law; or (iii) is a party to any order, decree, or agreement that imposes any obligation or liability under
any Privacy Law.

Any certificate signed by any officer of the Company or any of its Subsidiaries and delivered to the Agent or to counsel for the
Agent pursuant to or in connection with this Agreement shall be deemed to be a representation and warranty by the Company, as
applicable, to the Agent as to the matters covered thereby.

7.

Covenants of the Company.  The Company covenants and agrees with Agent that:

(a)

Registration Statement Amendments.  After the date of this Agreement and during any period in
which a Prospectus relating to any Placement Shares is required to be delivered by the Agent under the Securities Act (including
in circumstances where such requirement may be satisfied pursuant to Rule 172 under the Securities Act or similar rule), (i) the
Company will notify the Agent promptly of the time when any subsequent amendment to

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the  Registration  Statement,  other  than  documents  incorporated  by  reference,  has  been  filed  with  the  Commission  and/or  has
become effective or any subsequent supplement to the Prospectus has been filed and of any request by the Commission for any
amendment  or  supplement  to  the  Registration  Statement  or  Prospectus  or  for  additional  information,  (ii)  the  Company  will
prepare and file with the Commission, promptly upon the Agent’s request, any amendments or supplements to the Registration
Statement or Prospectus that, in the Agent’s reasonable opinion, based on the advice of counsel, may be necessary or advisable in
connection with the distribution of the Placement Shares by the Agent (provided, however, that the failure of the Agent to make
such  request  shall  not  relieve  the  Company  of  any  obligation  or  liability  hereunder,  or  affect  the  Agent’s  right  to  rely  on  the
representations and warranties made by the Company in this Agreement and provided, further, that the only remedy the Agent
shall  have  with  respect  to  the  failure  to  make  such  filing  shall  be  to  cease  making  sales  under  this  Agreement  until  such
amendment or supplement is filed); (iii) the Company will not file any amendment or supplement to the Registration Statement
or Prospectus relating to the Placement Shares or a security convertible into the Placement Shares unless a copy thereof has been
submitted to the Agent within a reasonable period of time before the filing and the Agent has not reasonably objected thereto in
writing within two (2) Business Days (provided, however, that the failure of the Agent to make such objection shall not relieve
the  Company  of  any  obligation  or  liability  hereunder,  or  affect  the  Agent’s  right  to  rely  on  the  representations  and  warranties
made by the Company in this Agreement, and the Company has no obligation to provide the Agent any advance copy of such
filing or to provide the Agent an opportunity to object to such filing if such filing does not name the Agent and does not reference
the transactions contemplated hereby; provided, further, that the only remedy the Agent shall have with respect to the failure by
the Company to obtain such consent shall be to cease making sales under this Agreement) and the Company will furnish to the
Agent at the time of filing thereof a copy of any document that upon filing is deemed to be incorporated by reference into the
Registration Statement or Prospectus, except for those documents available via EDGAR; and (iv) the Company will cause each
amendment or supplement to the Prospectus to be filed with the Commission as required pursuant to the applicable paragraph of
Rule 424(b) of the Securities Act or, in the case of any document to be incorporated therein by reference, to be filed with the
Commission as required pursuant to the Exchange Act, within the time period prescribed (the determination to file or not file any
amendment  or  supplement  with  the  Commission  under  this  Section  7(a),  based  on  the  Company’s  reasonable  opinion  or
reasonable objections, shall be made exclusively by the Company).

(b)

Notice  of  Commission  Stop  Orders.    The  Company  will  advise  the  Agent,  promptly  after  it
receives  notice  or  obtains  knowledge  thereof,  of  the  issuance  or  threatened  issuance  by  the  Commission  of  any  stop  order
suspending  the  effectiveness  of  the  Registration  Statement,  of  the  suspension  of  the  qualification  of  the  Placement  Shares  for
offering or sale in any jurisdiction, or of the initiation or threatening of any proceeding for any such purpose; and it will promptly
use its commercially reasonable efforts to prevent the issuance of any stop order or to obtain its withdrawal if such a stop order
should  be  issued.    The  Company  will  advise  the  Agent  promptly  after  it  receives  any  request  by  the  Commission  for  any
amendments  to  the  Registration  Statement  or  any  amendment  or  supplements  to  the  Prospectus  or  any  Issuer  Free  Writing
Prospectus or for additional information related to the offering of the Placement Shares or for additional information related to
the  Registration  Statement,  the  Prospectus  or  any  Issuer  Free  Writing  Prospectus;  provided,  however,  that  the  Company  may
delay any such amendment

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or supplement if, in the reasonable judgment of the Company, it is in the best interests of the Company to do so.

(c)

Delivery of Prospectus; Subsequent Changes.  During any period in which a Prospectus relating to
the Placement Shares is required to be delivered by the Agent under the Securities Act with respect to the offer and sale of the
Placement Shares (including in circumstances where such requirement may be satisfied pursuant to Rule 172 under the Securities
Act or similar rule), the Company will comply in all material respects with all requirements imposed upon it by the Securities
Act,  as  from  time  to  time  in  force,  and  to  file  on  or  before  their  respective  due  dates  all  reports  and  any  definitive  proxy  or
information statements required to be filed by the Company with the Commission pursuant to Sections 13(a), 13(c), 14, 15(d) or
any other provision of or under the Exchange Act.  If the Company has omitted any information from the Registration Statement
pursuant to Rule 430B under the Securities Act, it will use its best efforts to comply with the provisions of and make all requisite
filings  with  the  Commission  pursuant  to  said  Rule  430B  and  to  notify  the  Agent  promptly  of  all  such  filings.    If  during  such
period any event occurs as a result of which the Prospectus as then amended or supplemented would include an untrue statement
of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances then
existing, not misleading, or if during such period it is necessary to amend or supplement the Registration Statement or Prospectus
to  comply  with  the  Securities  Act,  the  Company  will  promptly  notify  the  Agent  to  suspend  the  offering  of  Placement  Shares
during  such  period  and  the  Company  will  promptly  amend  or  supplement  the  Registration  Statement  or  Prospectus  (at  the
expense of the Company) so as to correct such statement or omission or effect such compliance.

its reasonable best efforts to cause the Placement Shares to be listed on the Exchange.

(d)

Listing of Placement Shares.  Prior to the date of the first Placement Notice, the Company will use

(e)

Delivery of Registration Statement and Prospectus.  The Company will furnish to the Agent and its
counsel  (at  the  expense  of  the  Company)  copies  of  the  Registration  Statement,  the  Prospectus  (including  all  Incorporated
Documents) and all amendments and supplements to the Registration Statement or Prospectus that are filed with the Commission
during  any  period  in  which  a  Prospectus  relating  to  the  Placement  Shares  is  required  to  be  delivered  under  the  Securities  Act
(including all documents filed with the Commission during such period that are deemed to be incorporated by reference therein),
in each case as soon as reasonably practicable and in such quantities as the Agent may from time to time reasonably request and,
at the Agent’s request, will also furnish copies of the Prospectus to each exchange or market on which sales of the Placement
Shares  may  be  made;  provided,  however,  that  the  Company  shall  not  be  required  to  furnish  any  document  (other  than  the
Prospectus) to the Agent to the extent such document is available on EDGAR.

Earnings Statement.  The Company will make generally available to its security holders as soon as
practicable, but in any event not later than 15 months after the end of the Company’s current fiscal quarter, an earnings statement
covering a 12-month period that satisfies the provisions of Section 11(a) and Rule 158 of the Securities Act.

(f)

section entitled “Use of Proceeds.”

(g)

Use of Proceeds.   The  Company  will  use  the  Net  Proceeds  as  described  in  the  Prospectus  in  the

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(h)

Notice  of  Other  Sales.    Without  the  prior  written  consent  of  the  Agent,  the  Company  will  not,
directly or indirectly, offer to sell, sell, contract to sell, grant any option to sell or otherwise dispose of any Common Stock (other
than the Placement Shares offered pursuant to this Agreement) or securities convertible into or exchangeable for Common Stock,
warrants  or  any  rights  to  purchase  or  acquire,  Common  Stock  during  the  period  beginning  on  the  fifth  (5th)  Trading  Day
immediately prior to the date on which any Placement Notice is delivered to the Agent hereunder and ending on the second (2nd)
Trading Day immediately following the final Settlement Date with respect to Placement Shares sold pursuant to such Placement
Notice  (or,  if  the  Placement  Notice  has  been  terminated  or  suspended  prior  to  the  sale  of  all  Placement  Shares  covered  by  a
Placement Notice, the date of such suspension or termination); and will not directly or indirectly in any other “at the market” or
continuous  equity  transaction  offer  to  sell,  sell,  contract  to  sell,  grant  any  option  to  sell  or  otherwise  dispose  of  any  Common
Stock  (other  than  the  Placement  Shares  offered  pursuant  to  this  Agreement)  or  securities  convertible  into  or  exchangeable  for
Common  Stock,  warrants  or  any  rights  to  purchase  or  acquire,  Common  Stock  prior  to  the  later  of  the  termination  of  this
Agreement and the thirtieth (30th)  day  immediately  following  the  final  Settlement  Date  with  respect  to  Placement  Shares  sold
pursuant  to  such  Placement  Notice;  provided,  however,  that  such  restrictions  will  not  be  required  in  connection  with  the
Company’s  issuance  or  sale  of  (i)  Common  Stock,  options  to  purchase  Common  Stock  or  Common  Stock  issuable  upon  the
exercise  of  options,  pursuant  to  any  employee  or  director  stock  option  or  benefits  plan,  stock  ownership  plan  or  dividend
reinvestment  plan  (but  not  Common  Stock  subject  to  a  waiver  to  exceed  plan  limits  in  its  dividend  reinvestment  plan)  of  the
Company  whether  now  in  effect  or  hereafter  implemented,  (ii)  Common  Stock  issuable  upon  conversion  of  securities  or  the
exercise  of  warrants,  options  or  other  rights  in  effect  or  outstanding,  and  disclosed  in  filings  by  the  Company  available  on
EDGAR or otherwise in writing to the Agent and (iii) Common Stock or securities convertible into or exchangeable for shares of
Common Stock as consideration for mergers, acquisitions, other business combinations or strategic alliances occurring after the
date of this Agreement which are not issued for capital raising purposes.

(i)

Change  of  Circumstances.    The  Company  will,  at  any  time  during  the  pendency  of  a  Placement
Notice, advise the Agent promptly after it shall have received notice or obtained knowledge thereof, of any information or fact
that would alter or affect in any material respect any opinion, certificate, letter or other document required to be provided to the
Agent pursuant to this Agreement.

(j)

Due  Diligence  Cooperation.    The  Company  will  cooperate  with  any  reasonable  due  diligence
review conducted by the Agent or its representatives in connection with the transactions contemplated hereby, including, without
limitation, providing information and making available documents and senior corporate officers, during regular business hours
and at the Company’s principal offices, as the Agent may reasonably request.

(k)

Required Filings Relating to Placement of Placement Shares.  The Company agrees that on such
dates  as  the  Securities  Act  shall  require,  the  Company  will  (i)  file  a  prospectus  supplement  with  the  Commission  under  the
applicable  paragraph  of  Rule  424(b)  under  the  Securities  Act,  which  prospectus  supplement  will  set  forth,  within  the  relevant
period, the amount of Placement Shares sold through the Agent, the Net Proceeds to the Company and the compensation payable
by the Company to the Agent with respect to such Placement Shares,

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and (ii) deliver such number of copies of each such prospectus supplement to each exchange or market on which such sales were
effected as may be required by the rules or regulations of such exchange or market.

the first Placement Notice and (2) thereafter, each time the Company:

(l)

Representation Dates; Certificate.  During the term of this Agreement, (1) on or prior to the date of

(i) files the Prospectus relating to the Placement Shares (other than as part of any filing prior to the time of the initial
effectiveness  of  the  Registration  Statement)  or  amends  or  supplements  (other  than  a  prospectus  supplement  relating
solely to an offering of securities other than the Placement Shares) the Registration Statement or the Prospectus relating
to  the  Placement  Shares  by  means  of  a  post-effective  amendment,  sticker,  or  supplement  but  not  by  means  of
incorporation  of  documents  by  reference  into  the  Registration  Statement  or  the  Prospectus  relating  to  the  Placement
Shares;

(ii)  files  an  annual  report  on  Form  10-K  under  the  Exchange  Act  (including  any  Form  10-K/A  containing  amended
financial information or a material amendment to the previously filed Form 10-K);

(iii) files its quarterly reports on Form 10-Q under the Exchange Act; or

(iv) files a current report on Form 8-K containing amended financial information (other than information “furnished”
pursuant to Items 2.02 or 7.01 of Form 8-K or to provide disclosure pursuant to Item 8.01 of Form 8-K relating to the
reclassification of certain properties as discontinued operations in accordance with Statement of Financial Accounting
Standards No. 144) under the Exchange Act (each date of filing of one or more of the documents referred to in clauses
(i) through (iv) shall be a “Representation Date”);

the  Company  shall  furnish  the  Agent  (but  in  the  case  of  clause  (iv)  above  only  if  the  Agent  reasonably  determines  that  the
information contained in such Form 8‑K is material) with a certificate dated the Representation Date, in the form attached hereto
as  Schedule  7(l),  modified,  as  necessary,  to  relate  to  the  Registration  Statement  and  the  Prospectus  as  amended  or
supplemented.    The  requirement  to  provide  a  certificate  under  this  Section  7(l)  shall  be  automatically  waived  for  any
Representation Date occurring (1) at a time a Suspension is in effect, which waiver shall continue until the earlier to occur of the
date  the  Company  delivers  instructions  for  the  sale  of  Placement  Shares  hereunder  (which  for  such  calendar  quarter  shall  be
considered a Representation Date) and the next occurring Representation Date and (2) at a time when no Placement Notice is
pending, which waiver shall continue until the date the Company delivers a Placement Notice.  Notwithstanding the foregoing, if
the Company subsequently decides to sell Placement Shares following a Representation Date when the Company relied on such
waiver and did not provide the Agent with a certificate under this Section 7(l), then before the Company delivers the instructions
for  the  sale  of  Placement  Shares  or  the  Agent  sells  any  Placement  Shares  pursuant  to  such  instructions,  the  Company  shall
provide the Agent with a certificate in conformity with this Section 7(l) dated as of the date that the instructions for the sale of
Placement Shares are issued.  

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(m)

Legal Opinions.  (1) On or prior to the date of the first Placement Notice and (2) thereafter, within
five  (5)  Trading  Days  of  each  Representation  Date  with  respect  to  which  the  Company  is  obligated  to  deliver  a  certificate
pursuant to Section 7(l) for which no waiver is applicable and excluding the date of this Agreement, the Company shall cause to
be furnished to the Agent (A) a written opinion and a negative assurance letter of Mintz, Levin, Cohn, Ferris, Glovsky & Popeo,
P.C. (“Company Counsel”), or other counsel satisfactory to the Agent, and (B) a written opinion of Cantor Colburn LLP (“IP
Counsel”), or other counsel satisfactory to the Agent, in each case in form and substance reasonably satisfactory to Agent and its
counsel, substantially similar to the forms previously provided to the Agent and its counsel, modified, as necessary, to relate to
the  Registration  Statement  and  the  Prospectus  as  then  amended  or  supplemented;  provided,  however,  the  Company  shall  be
required to furnish to Agent no more than one opinion from each of Company Counsel and IP Counsel hereunder per calendar
quarter; and provided, further, that in lieu of such opinions for subsequent Representation Dates, counsel may furnish the Agent
with a letter (a “Reliance Letter”) to the effect that the Agent may rely on a prior opinion delivered under this Section 7(m) to
the same extent as if it were dated the date of such letter (except that statements in such prior opinion shall be deemed to relate to
the Registration Statement and the Prospectus as amended or supplemented as of the date of the Reliance Letter).

(n)

Comfort Letter.  (1) On or prior to the date of the first Placement Notice and (2) thereafter, within
five  (5)  Trading  Days  of  each  Representation  Date  with  respect  to  which  the  Company  is  obligated  to  deliver  a  certificate
pursuant to Section 7(l) for which no waiver is applicable and excluding the date of this Agreement, the Company shall cause its
independent registered public accounting firm to furnish the Agent letters (the “Comfort Letters”), dated the date the Comfort
Letter is delivered, which shall meet the requirements set forth in this Section 7(n); provided, however, that if requested by the
Agent,  the  Company  shall  cause  a  Comfort  Letter  to  be  furnished  to  the  Agent  within  ten  (10)  Trading  Days  of  the  date  of
occurrence of any material transaction or event, including the restatement of the Company’s financial statements.  The Comfort
Letter  from  the  Company’s  independent  registered  public  accounting  firm  shall  be  in  a  form  and  substance  reasonably
satisfactory to the Agent, (i) confirming that they are an independent registered public accounting firm within the meaning of the
Securities Act and the Public Company Accounting Oversight Board, (ii) stating, as of such date, the conclusions and findings of
such  firm  with  respect  to  the  financial  information  and  other  matters  ordinarily  covered  by  accountants’  “comfort  letters”  to
underwriters in connection with registered public offerings (the first such letter, the “Initial Comfort Letter”) and (iii) updating
the Initial Comfort Letter with any information that would have been included in the Initial Comfort Letter had it been given on
such date and modified as necessary to relate to the Registration Statement and the Prospectus, as amended and supplemented to
the date of such letter.

(o)

Market Activities.    The  Company  will  not,  directly  or  indirectly,  (i)  take  any  action  designed  to
cause or result in, or that constitutes or would reasonably be expected to constitute, the stabilization or manipulation of the price
of any security of the Company to facilitate the sale or resale of Common Stock or (ii) sell, bid for, or purchase Common Stock in
violation  of  Regulation  M,  or  pay  anyone  any  compensation  for  soliciting  purchases  of  the  Placement  Shares  other  than  the
Agent.

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Investment  Company  Act.    The  Company  will  conduct  its  affairs  in  such  a  manner  so  as  to
reasonably  ensure  that  neither  it  nor  any  of  its  Subsidiaries  will  be  or  become,  at  any  time  prior  to  the  termination  of  this
Agreement, required to register as an “investment company,” as such term is defined in the Investment Company Act.

(p)

(q)

No  Offer  to  Sell.    Other  than  an  Issuer  Free  Writing  Prospectus  approved  in  advance  by  the
Company  and  the  Agent  in  its  capacity  as  agent  hereunder,  neither  the  Agent  nor  the  Company  (including  its  agents  and
representatives, other than the Agent in its capacity as such) will make, use, prepare, authorize, approve or refer to any written
communication (as defined in Rule 405 under the Securities Act), required to be filed with the Commission, that constitutes an
offer to sell or solicitation of an offer to buy Placement Shares hereunder.

(r)

Blue Sky and Other Qualifications. The Company will use its commercially reasonable efforts, in
cooperation with the Agent, to qualify the Placement Shares for offering and sale, or to obtain an exemption for the Placement
Shares to be offered and sold, under the applicable securities laws of such states and other jurisdictions (domestic or foreign) as
the Agent may designate and to maintain such qualifications and exemptions in effect for so long as required for the distribution
of the Placement Shares (but in no event for less than one year from the date of this Agreement); provided, however,  that  the
Company shall not be obligated to file any general consent to service of process or to qualify as a foreign corporation or as a
dealer in securities in any jurisdiction in which it is not so qualified or to subject itself to taxation in respect of doing business in
any jurisdiction in which it is not otherwise so subject.  In each jurisdiction in which the Placement Shares have been so qualified
or exempt, the Company will file such statements and reports as may be required by the laws of such jurisdiction to continue such
qualification or exemption, as the case may be, in effect for so long as required for the distribution of the Placement Shares (but
in no event for less than one year from the date of this Agreement).

(s)

Sarbanes-Oxley Act.    The  Company  and  the  Subsidiaries  will  maintain  and  keep  accurate  books
and  records  reflecting  their  assets  and  maintain  internal  accounting  controls  in  a  manner  designed  to  provide  reasonable
assurance  regarding  the  reliability  of  financial  reporting  and  the  preparation  of  financial  statements  for  external  purposes  in
accordance  with  GAAP  and  including  those  policies  and  procedures  that  (i)  pertain  to  the  maintenance  of  records  that  in
reasonable  detail  accurately  and  fairly  reflect  the  transactions  and  dispositions  of  the  assets  of  the  Company,  (ii)  provide
reasonable  assurance  that  transactions  are  recorded  as  necessary  to  permit  the  preparation  of  the  Company’s  consolidated
financial  statements  in  accordance  with  GAAP,  (iii)  that  receipts  and  expenditures  of  the  Company  are  being  made  only  in
accordance  with  management’s  and  the  Company’s  directors’  authorization,  and  (iv)  provide  reasonable  assurance  regarding
prevention or timely detection of unauthorized acquisition, use or disposition of the Company’s assets that could have a material
effect on its financial statements.  The Company and the Subsidiaries will maintain such controls and other procedures, including,
without limitation, those required by Sections 302 and 906 of the Sarbanes-Oxley Act, and the applicable regulations thereunder
that are designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under
the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Commission’s rules
and forms, including, without limitation, controls and procedures designed to ensure that information required to be disclosed by
the Company in the

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reports  that  it  files  or  submits  under  the  Exchange  Act  is  accumulated  and  communicated  to  the  Company’s  management,
including its principal executive officer and principal financial officer, or persons performing similar functions, as appropriate to
allow  timely  decisions  regarding  required  disclosure  and  to  ensure  that  material  information  relating  to  the  Company  or  the
Subsidiaries is made known to them by others within those entities, particularly during the period in which such periodic reports
are being prepared.

(t)

Secretary’s  Certificate;  Further  Documentation.    On  or  prior  to  the  date  of  the  first  Placement
Notice,  the  Company  shall  deliver  to  the  Agent  a  certificate  of  the  Secretary  of  the  Company  and  attested  to  by  an  executive
officer of the Company, dated as of such date, certifying as to (i) the Amended and Restated Certificate of Incorporation of the
Company, (ii) the Amended and Restated Bylaws of the Company, (iii) the resolutions of the Board of Directors of the Company,
or a duly authorized committee of the Board of Directors, authorizing the execution, delivery and performance of this Agreement
and the issuance of the Placement Shares and (iv) the incumbency of the officers duly authorized to execute this Agreement and
the other documents contemplated by this Agreement.  Within five (5) Trading Days of each Representation Date with respect to
which the Company is obligated to deliver a certificate pursuant to Section 7(l) for which no waiver is applicable, the Company
shall have furnished to the Agent such further information, certificates and documents as the Agent may reasonably request.

ceases to be an Emerging Growth Company at any time during the term of this Agreement.

(u)

Emerging Growth Company Status.  The Company will promptly notify the Agent if the Company

8.

Payment  of  Expenses.    The  Company  will  pay  all  expenses  incident  to  the  performance  of  its  obligations
under this Agreement, including (i) the preparation and filing of the Registration Statement, including any fees required by the
Commission, and the printing or electronic delivery of the Prospectus as originally filed and of each amendment and supplement
thereto, in such number as the Agent shall deem necessary, (ii) the printing and delivery to the Agent of this Agreement and such
other documents as may be required in connection with the offering, purchase, sale, issuance or delivery of the Placement Shares,
(iii) the preparation, issuance and delivery of the certificates, if any, for the Placement Shares to the Agent, including any stock or
other transfer taxes and any capital duties, stamp duties or other duties or taxes payable upon the sale, issuance or delivery of the
Placement Shares to the Agent, (iv) the fees and disbursements of the counsel, accountants and other advisors to the Company,
(v) the fees and disbursements of the counsel to the Agent, payable upon the execution of this Agreement, in an amount not to
exceed $50,000, (vi) the qualification or exemption of the Placement Shares under state securities laws in accordance with the
provisions of Section 7(r) hereof, including filing fees, but excluding fees of the Agent’s counsel, (vii) the printing and delivery
to the Agent of copies of any Permitted Free Writing Prospectus (as defined below) and the Prospectus and any amendments or
supplements thereto in such number as the Agent shall deem necessary, (viii) the preparation, printing and delivery to the Agent
of copies of the blue sky survey, (ix) the fees and expenses of the transfer agent and registrar for the Common Stock, (x) the filing
and other fees incident to any review by FINRA of the terms of the sale of the Placement Shares including the fees of the Agent’s
counsel (subject to the cap, set forth in clause (v) above), and

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(xi) the fees and expenses incurred in connection with the listing of the Placement Shares on the Exchange.

9.

Conditions to the Agent’s Obligations.  The obligations of the Agent hereunder with respect to a Placement
will be subject to the continuing accuracy and completeness of the representations and warranties made by the Company herein,
to the due performance by the Company of its obligations hereunder, to the completion by the Agent of a due diligence review
satisfactory to it in its reasonable judgment, and to the continuing satisfaction (or waiver by the Agent in its sole discretion) of the
following additional conditions:

Registration  Statement  Effective.    The  Registration  Statement  shall  have  become  effective  and
shall be available for the (i) resale of all Placement Shares issued to the Agent and not yet sold by the Agent and (ii) sale of all
Placement Shares contemplated to be issued by any Placement Notice.

(a)

(b)

No  Material  Notices.    None  of  the  following  events  shall  have  occurred  and  be  continuing:
(i)  receipt  by  the  Company  of  any  request  for  additional  information  from  the  Commission  or  any  other  federal  or  state
Governmental Authority during the period of effectiveness of the Registration Statement, the response to which would require
any post-effective amendments or supplements to the Registration Statement or the Prospectus if such post-effective amendments
or  supplements  have  not  been  made  and  become  effective;  (ii)  the  issuance  by  the  Commission  or  any  other  federal  or  state
Governmental  Authority  of  any  stop  order  suspending  the  effectiveness  of  the  Registration  Statement  or  the  initiation  of  any
proceedings for that purpose; (iii) receipt by the Company of any notification with respect to the suspension of the qualification
or exemption from qualification of any of the Placement Shares for sale in any jurisdiction or the initiation or threatening of any
proceeding  for  such  purpose;  or  (iv)  the  occurrence  of  any  event  that  makes  any  material  statement  made  in  the  Registration
Statement or the Prospectus or any material document incorporated or deemed to be incorporated therein by reference untrue in
any material respect or that requires the making of any changes in the Registration Statement, the Prospectus or documents so
that,  in  the  case  of  the  Registration  Statement,  it  will  not  contain  an  untrue  statement  of  a  material  fact  or  omit  to  state  any
material fact required to be stated therein or necessary to make the statements therein not misleading and so that, in the case of
the Prospectus, it will not contain an untrue statement of a material fact or omit to state any material fact required to be stated
therein  or  necessary  to  make  the  statements  therein,  in  the  light  of  the  circumstances  under  which  they  were  made,  not
misleading.

(c)

No Misstatement or Material Omission.  The Agent shall not have advised the Company that the
Registration Statement or Prospectus, or any amendment or supplement thereto, contains an untrue statement of fact that in the
Agent’s reasonable opinion is material, or omits to state a fact that in the Agent’s reasonable opinion is material and is required to
be stated therein or is necessary to make the statements therein not misleading.

(d)

Material  Changes.    Except  as  contemplated  in  the  Prospectus,  or  disclosed  in  the  Company’s
reports filed with the Commission, there shall not have been any material adverse change in the authorized capital stock of the
Company or any Material Adverse Effect or any development that would reasonably be expected to cause a Material Adverse
Effect,  or  a  downgrading  in  or  withdrawal  of  the  rating  assigned  to  any  of  the  Company’s  securities  (other  than  asset  backed
securities) by any rating organization or a public announcement by any rating

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organization  that  it  has  under  surveillance  or  review  its  rating  of  any  of  the  Company’s  securities  (other  than  asset  backed
securities),  the  effect  of  which,  in  the  case  of  any  such  action  by  a  rating  organization  described  above,  in  the  reasonable
judgment of the Agent (without relieving the Company of any obligation or liability it may otherwise have), is so material as to
make  it  impracticable  or  inadvisable  to  proceed  with  the  offering  of  the  Placement  Shares  on  the  terms  and  in  the  manner
contemplated in the Prospectus.

Legal  Opinions.    The  Agent  shall  have  received  the  opinion  and  negative  assurance  letter  of
Company  Counsel  and  the  opinion  of  IP  Counsel  required  to  be  delivered  pursuant  to  Section  7(m)  on  or  before  the  date  on
which such delivery of such opinions and negative assurance letter is required pursuant to Section 7(m).

(e)

Comfort  Letter.    The  Agent  shall  have  received  the  Comfort  Letter  required  to  be  delivered
pursuant to Section 7(n) on or before the date on which such delivery of such Comfort Letter is required pursuant to Section 7(n).

(f)

pursuant to Section 7(l) on or before the date on which delivery of such certificate is required pursuant to Section 7(l).

(g)

Representation Certificate.  The Agent shall have received the certificate required to be delivered

and the Common Stock shall not have been delisted from the Exchange.

(h)

No Suspension.   Trading  in  the  Common  Stock  shall  not  have  been  suspended  on  the  Exchange

(i)

Other Materials.  On each date on which the Company is required to deliver a certificate pursuant to
Section 7(l), the Company shall have furnished to the Agent such appropriate further information, opinions, certificates, letters
and other documents as the Agent may reasonably request.  All such opinions, certificates, letters and other documents will be in
compliance with the provisions hereof.

Securities Act Filings Made.  All filings with the Commission with respect to the Placement Shares
required by Rule 424 under the Securities Act to have been filed prior to the issuance of any Placement Notice hereunder shall
have been made within the applicable time period prescribed for such filing by Rule 424.

(j)

(k)

Approval for Listing.  The Placement Shares shall either have been (i) approved for listing on the
Exchange,  subject  only  to  notice  of  issuance,  or  (ii)  the  Company  shall  have  filed  an  application  for  listing  of  the  Placement
Shares  on  the  Exchange  at,  or  prior  to,  the  issuance  of  any  Placement  Notice  and  the  Exchange  shall  have  reviewed  such
application and not provided any objections thereto.

amount of compensation allowable or payable to the Agent as described in the Prospectus.

(l)

FINRA.  If applicable, FINRA shall have raised no objection to the terms of this offering and the

terminate this Agreement pursuant to Section 12(a).

(m)

No Termination Event.  There shall not have occurred any event that would permit the Agent to

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10.

Indemnification and Contribution.

Company Indemnification.    The  Company  agrees  to  indemnify  and  hold  harmless  the  Agent,  its
affiliates and their respective partners, members, directors, officers, employees and agents and each person, if any, who controls
the Agent within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act as follows:

(a)

(i)

against  any  and  all  loss,  liability,  claim,  damage  and  expense  whatsoever,  as  incurred,
joint or several, arising out of or based upon any untrue statement or alleged untrue statement of a material fact contained in the
Registration Statement (or any amendment thereto), or the omission or alleged omission therefrom of a material fact required to
be stated therein or necessary to make the statements therein not misleading, or arising out of any untrue statement or alleged
untrue statement of a material fact included in any related Issuer Free Writing Prospectus or the Prospectus (or any amendment or
supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements
therein, in the light of the circumstances under which they were made, not misleading;

(ii)

against  any  and  all  loss,  liability,  claim,  damage  and  expense  whatsoever,  as  incurred,
joint or several, to the extent of the aggregate amount paid in settlement of any litigation, or any investigation or proceeding by
any  Governmental  Authority,  commenced  or  threatened,  or  of  any  claim  whatsoever  based  upon  any  such  untrue  statement  or
omission, or any such alleged untrue statement or omission; provided that (subject to Section 10(d) below) any such settlement is
effected with the written consent of the Company, which consent shall not unreasonably be delayed or withheld; and

(iii)

against  any  and  all  expense  whatsoever,  as  incurred  (including  the  fees  and
disbursements  of  counsel),  reasonably  incurred  in  investigating,  preparing  or  defending  against  any  litigation,  or  any
investigation or proceeding by any Governmental Authority, commenced or threatened, or any claim whatsoever based upon any
such untrue statement or omission, or any such alleged untrue statement or omission (whether or not a party), to the extent that
any such expense is not paid under (i) or (ii) above,

provided, however,  that  this  indemnity  agreement  shall  not  apply  to  any  loss,  liability,  claim,  damage  or  expense  to  the  extent
arising  out  of  any  untrue  statement  or  omission  or  alleged  untrue  statement  or  omission  made  solely  in  reliance  upon  and  in
conformity with the Agent Information.

(b)

Agent Indemnification.   The  Agent  agrees  to  indemnify  and  hold  harmless  the  Company  and  its
directors  and  each  officer  of  the  Company  who  signed  the  Registration  Statement,  and  each  person,  if  any,  who  controls  the
Company  within  the  meaning  of  Section  15  of  the  Securities  Act  or  Section  20  of  the  Exchange  Act  against  any  and  all  loss,
liability, claim, damage and expense described in the indemnity contained in Section 10(a), as incurred, but only with respect to
untrue  statements  or  omissions,  or  alleged  untrue  statements  or  omissions,  made  in  the  Registration  Statement  (or  any
amendments thereto), the Prospectus (or any amendment or supplement thereto) or any Issuer Free Writing Prospectus (or any
amendment or supplement thereto) in reliance upon and in conformity with information relating to the Agent and furnished to the
Company in writing by the Agent expressly for use therein.  The Company hereby acknowledges that the only information that
the Agent has furnished to the Company expressly

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for use in the Registration Statement, the Prospectus or any Issuer Free Writing Prospectus (or any amendment or supplement
thereto) is the Agent Information.

(c)

Procedure.  Any party that proposes to assert the right to be indemnified under this Section 10 will,
promptly  after  receipt  of  notice  of  commencement  of  any  action  against  such  party  in  respect  of  which  a  claim  is  to  be  made
against an indemnifying party or parties under this Section 10, notify each such indemnifying party of the commencement of such
action,  enclosing  a  copy  of  all  papers  served,  but  the  omission  so  to  notify  such  indemnifying  party  will  not  relieve  the
indemnifying party from (i) any liability that it might have to any indemnified party otherwise than under this Section 10  and
(ii) any liability that it may have to any indemnified party under the foregoing provision of this Section 10 unless, and only to the
extent that, such omission results in the forfeiture of substantive rights or defenses by the indemnifying party.  If any such action
is brought against any indemnified party and it notifies the indemnifying party of its commencement, the indemnifying party will
be entitled to participate in and, to the extent that it elects by delivering written notice to the indemnified party promptly after
receiving  notice  of  the  commencement  of  the  action  from  the  indemnified  party,  jointly  with  any  other  indemnifying  party
similarly notified, to assume the defense of the action, with counsel reasonably satisfactory to the indemnified party, and after
notice from the indemnifying party to the indemnified party of its election to assume the defense, the indemnifying party will not
be liable to the indemnified party for any legal or other expenses except as provided herein and except for the reasonable costs of
investigation subsequently incurred by the indemnified party in connection with the defense.  The indemnified party will have the
right  to  employ  its  own  counsel  in  any  such  action,  but  the  fees,  expenses  and  other  charges  of  such  counsel  will  be  at  the
expense of such indemnified party unless (1) the employment of counsel by the indemnified party has been authorized in writing
by the indemnifying party, (2) the indemnified party has reasonably concluded (based on advice of counsel) that there may be
legal  defenses  available  to  it  or  other  indemnified  parties  that  are  different  from  or  in  addition  to  those  available  to  the
indemnifying party, (3) a conflict or potential conflict exists (based on advice of counsel to the indemnified party) between the
indemnified party and the indemnifying party (in which case the indemnifying party will not have the right to direct the defense
of such action on behalf of the indemnified party) or (4) the indemnifying party has not in fact employed counsel to assume the
defense of such action or counsel reasonably satisfactory to the indemnified party, in each case, within a reasonable time after
receiving notice of the commencement of the action, in each of which cases the reasonable fees, disbursements and other charges
of counsel will be at the expense of the indemnifying party or parties.  It is understood that the indemnifying party or parties shall
not,  in  connection  with  any  proceeding  or  related  proceedings  in  the  same  jurisdiction,  be  liable  for  the  reasonable  fees,
disbursements and other charges of more than one separate firm (plus local counsel) admitted to practice in such jurisdiction at
any one time for all such indemnified party or parties.  All such fees, disbursements and other charges will be reimbursed by the
indemnifying party promptly as they are incurred.  An indemnifying party will not, in any event, be liable for any settlement of
any action or claim effected without its written consent.  No indemnifying party shall, without the prior written consent of each
indemnified party, settle or compromise or consent to the entry of any judgment in any pending or threatened claim, action or
proceeding  relating  to  the  matters  contemplated  by  this  Section  10  (whether  or  not  any  indemnified  party  is  a  party  thereto),
unless such settlement, compromise or consent (1) includes an express and unconditional release of each indemnified party from
all liability arising out of such litigation, investigation, proceeding

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or claim and (2) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any
indemnified party.

(d)

Settlement Without Consent if Failure to Reimburse. If an indemnified party shall have requested
an indemnifying party to reimburse the indemnified party for reasonable fees and expenses of counsel, such indemnifying party
agrees that it shall be liable for any settlement of the nature contemplated by Section 10(a)(ii) effected without its written consent
if (1) such settlement is entered into more than 45 days after receipt by such indemnifying party of the aforesaid request, (2) such
indemnifying  party  shall  have  received  notice  of  the  terms  of  such  settlement  at  least  30  days  prior  to  such  settlement  being
entered into and (3) such indemnifying party shall not have reimbursed such indemnified party in accordance with such request
prior to the date of such settlement.

(e)

Contribution.  In order to provide for just and equitable contribution in circumstances in which the
indemnification provided for in the foregoing paragraphs of this Section 10 is applicable in accordance with its terms but for any
reason is held to be unavailable or insufficient from the Company or the Agent, the Company and the Agent will contribute to the
total losses, claims, liabilities, expenses and damages (including any investigative, legal and other expenses reasonably incurred
in  connection  with,  and  any  amount  paid  in  settlement  of,  any  action,  suit  or  proceeding  or  any  claim  asserted)  to  which  the
Company and the Agent may be subject in such proportion as shall be appropriate to reflect the relative benefits received by the
Company on the one hand and the Agent on the other hand.  The relative benefits received by the Company on the one hand and
the Agent on the other hand shall be deemed to be in the same proportion as the total net proceeds from the sale of the Placement
Shares  (before  deducting  expenses)  received  by  the  Company  bear  to  the  total  compensation  (before  deducting  expenses)
received by the Agent from the sale of Placement Shares on behalf of the Company.  If, but only if, the allocation provided by the
foregoing  sentence  is  not  permitted  by  applicable  law,  the  allocation  of  contribution  shall  be  made  in  such  proportion  as  is
appropriate to reflect not only the relative benefits referred to in the foregoing sentence but also the relative fault of the Company,
on the one hand, and the Agent, on the other hand, with respect to the statements or omission that resulted in such loss, claim,
liability, expense or damage, or action in respect thereof, as well as any other relevant equitable considerations with respect to
such offering.  Such relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue
statement  of  a  material  fact  or  omission  or  alleged  omission  to  state  a  material  fact  relates  to  information  supplied  by  the
Company or the Agent, the intent of the parties and their relative knowledge, access to information and opportunity to correct or
prevent such statement or omission.  The Company and the Agent agree that it would not be just and equitable if contributions
pursuant to this Section 10(e) were to be determined by pro rata allocation or by any other method of allocation that does not take
into account the equitable considerations referred to herein.  The amount paid or payable by an indemnified party as a result of
the loss, claim, liability, expense, or damage, or action in respect thereof, referred to above in this Section 10(e) shall be deemed
to include, for the purpose of this Section 10(e), any legal or other expenses reasonably incurred by such indemnified party in
connection  with  investigating  or  defending  any  such  action  or  claim  to  the  extent  consistent  with  Section  10(c)
hereof.  Notwithstanding the foregoing provisions of this Section 10(e), the Agent shall not be required to contribute any amount
in  excess  of  the  commissions  received  by  it  under  this  Agreement  and  no  person  found  guilty  of  fraudulent  misrepresentation
(within the meaning of Section 11(f) of the

-29-

 
 
 
Securities Act) will be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.  For
purposes of this Section 10(e), any person who controls a party to this Agreement within the meaning of the Securities Act, any
controlled affiliates of the Agent and any officers, directors, partners, employees or agents of the Agent or any of its controlled
affiliates,  will  have  the  same  rights  to  contribution  as  that  party,  and  each  director  of  the  Company  and  each  officer  of  the
Company who signed the Registration Statement will have the same rights to contribution as the Company, subject in each case
to  the  provisions  hereof.   Any  party  entitled  to  contribution,  promptly  after  receipt  of  notice  of  commencement  of  any  action
against such party in respect of which a claim for contribution may be made under this Section 10(e), will notify any such party
or parties from whom contribution may be sought, but the omission to so notify will not relieve that party or parties from whom
contribution may be sought from any other obligation it or they may have under this Section 10(e) except to the extent that the
failure to so notify such other party materially prejudiced the substantive rights or defenses of the party from whom contribution
is sought.  Except for a settlement entered into pursuant to the last sentence of Section 10(c) hereof, no party will be liable for
contribution with respect to any action or claim settled without its written consent if such consent is required pursuant to Section
10(c) hereof.

11.

Representations and Agreements to Survive Delivery.  The indemnity and contribution agreements contained
in Section 10 of this Agreement and all representations and warranties of the Company herein or in certificates delivered pursuant
hereto  shall  survive,  as  of  their  respective  dates,  regardless  of  (i)  any  investigation  made  by  or  on  behalf  of  the  Agent,  any
controlling persons, or the Company (or any of their respective officers, directors, employees or controlling persons), (ii) delivery
and acceptance of the Placement Shares and payment therefor or (iii) any termination of this Agreement.

12.

Termination.

(a)

The Agent may terminate this Agreement, by notice to the Company, as hereinafter specified at any
time (1) if there has been, since the time of execution of this Agreement or since the date as of which information is given in the
Prospectus, any change, or any development or event involving a prospective change, in the condition, financial or otherwise, or
in  the  business,  properties,  earnings,  results  of  operations  or  prospects  of  the  Company  and  its  Subsidiaries  considered  as  one
enterprise, whether or not arising in the ordinary course of business, which individually or in the aggregate, in the sole judgment
of  the  Agent  is  material  and  adverse  and  makes  it  impractical  or  inadvisable  to  market  the  Placement  Shares  or  to  enforce
contracts for the sale of the Placement Shares, (2) if there has occurred any material adverse change in the financial markets in
the United States or the international financial markets, any outbreak of hostilities or escalation thereof or other calamity or crisis
or  any  change  or  development  involving  a  prospective  change  in  national  or  international  political,  financial  or  economic
conditions, in each case the effect of which is such as to make it, in the judgment of the Agent, impracticable or inadvisable to
market the Placement Shares or to enforce contracts for the sale of the Placement Shares, (3) if trading in the Common Stock has
been suspended or limited by the Commission or the Exchange, or if trading generally on the Exchange has been suspended or
limited, or minimum prices for trading have been fixed on the Exchange, (4) if any suspension of trading of any securities of the
Company on any exchange or in the over-the-counter market shall have occurred and be continuing, (5) if a major disruption of
securities

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settlements or clearance services in the United States shall have occurred and be continuing, or (6) if a banking moratorium has
been declared by either U.S. Federal or New York authorities.  Any such termination shall be without liability of any party to any
other  party  except  that  the  provisions  of  Section  8  (Payment  of  Expenses),  Section  10  (Indemnification  and  Contribution),
Section 11 (Representations and Agreements to Survive Delivery), Section 17 (Governing Law and Time; Waiver of Jury Trial)
and Section 18  (Consent  to  Jurisdiction)  hereof  shall  remain  in  full  force  and  effect  notwithstanding  such  termination.    If  the
Agent  elects  to  terminate  this  Agreement  as  provided  in  this  Section  12(a),  the  Agent  shall  provide  the  required  notice  as
specified in Section 13 (Notices).

(b)

The  Company  shall  have  the  right,  by  giving  ten  (10)  days’  notice  as  hereinafter  specified  to
terminate  this  Agreement  in  its  sole  discretion  at  any  time  after  the  date  of  this  Agreement.   Any  such  termination  shall  be
without liability of any party to any other party except that the provisions of Section 8, Section 10, Section 11, Section  17  and
Section 18 hereof shall remain in full force and effect notwithstanding such termination.

(c)

The Agent shall have the right, by giving ten (10) days’ notice as hereinafter specified to terminate
this Agreement in its sole discretion at any time after the date of this Agreement.  Any such termination shall be without liability
of any party to any other party except that the provisions of Section 8, Section 10, Section 11, Section 17 and Section 18 hereof
shall remain in full force and effect notwithstanding such termination.

(d)

Unless earlier terminated pursuant to this Section 12, this Agreement shall automatically terminate
upon the issuance and sale of all of the Placement Shares on the terms and subject to the conditions set forth herein except that
the  provisions  of  Section  8,  Section  10,  Section  11,  Section  17  and  Section  18  hereof  shall  remain  in  full  force  and  effect
notwithstanding such termination.

(e)

This Agreement shall remain in full force and effect unless terminated pursuant to Sections 12(a),
(b), (c) or (d) above or otherwise by mutual agreement of the parties; provided, however, that any such termination by mutual
agreement shall in all cases be deemed to provide that Section 8, Section 10, Section 11, Section 17 and Section 18 shall remain
in full force and effect.

(f)

Any  termination  of  this  Agreement  shall  be  effective  on  the  date  specified  in  such  notice  of
termination; provided, however, that such termination shall not be effective until the close of business on the date of receipt of
such notice by the Agent or the Company, as the case may be.  If such termination shall occur prior to the Settlement Date for any
sale of Placement Shares, such Placement Shares shall settle in accordance with the provisions of this Agreement.

-31-

 
 
 
13.

Notices.  All notices or other communications required or permitted to be given by any party to any other
party pursuant to the terms of this Agreement shall be in writing, unless otherwise specified, and if sent to the Agent, shall be
delivered to:

Cantor Fitzgerald & Co.
499 Park Avenue
New York, NY 10022
Attention:
Facsimile:

Capital Markets
(212) 307-3730

Cantor Fitzgerald & Co.
499 Park Avenue
New York, NY 10022
Attention:
Facsimile:

General Counsel
(212) 829-4708

with copies to:

and a copy to:

Latham & Watkins LLP
12670 High Bluff Drive
San Diego, CA 92130
Attention:
Facsimile:

Michael E. Sullivan, Esq.
(858) 523-5450

and if to the Company, shall be delivered to:

with a copy to:

Spero Therapeutics, Inc.
675 Massachusetts Avenue, 14th Floor
Cambridge, MA 02139
Attention:

Tamara Joseph, Esq., Chief Legal Officer

Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.
One Financial Center
Boston, MA 02111
Attention:
Facsimile:

Matthew J. Gardella
(617) 542-2241

Each party to this Agreement may change such address for notices by sending to the parties to this Agreement written
notice of a new address for such purpose.  Each such notice or other communication shall be deemed given (i) when delivered
personally or by verifiable facsimile transmission (with an original to follow) on or before 4:30 p.m., New York City time, on a
Business Day or, if such day is not a Business Day, on the next succeeding Business Day, (ii) by Electronic Notice as set forth in
the next paragraph, (iii) on the next Business Day after timely delivery to a nationally-recognized overnight courier or (iv) on the
Business Day actually

-32-

 
 
 
 
 
 
 
 
received if deposited in the U.S. mail (certified or registered mail, return receipt requested, postage prepaid).  For purposes of this
Agreement, “Business Day” shall mean any day on which the Exchange and commercial banks in the City of New York are open
for business.  

An electronic communication (“Electronic Notice”) shall be deemed written notice for purposes of this Section 13 if
sent  to  the  electronic  mail  address  specified  by  the  receiving  party  under  separate  cover.    Electronic  Notice  shall  be  deemed
received  at  the  time  the  party  sending  Electronic  Notice  receives  verification  of  receipt  by  the  receiving  party.    Any  party
receiving  Electronic  Notice  may  request  and  shall  be  entitled  to  receive  the  notice  on  paper,  in  a  nonelectronic  form
(“Nonelectronic Notice”) which shall be sent to the requesting party within ten (10) days of receipt of the written request for
Nonelectronic Notice.

14.

Successors and Assigns.  This Agreement shall inure to the benefit of and be binding upon the Company and
the  Agent  and  their  respective  successors  and  the  parties  referred  to  in  Section  10  hereof.    References  to  any  of  the  parties
contained  in  this  Agreement  shall  be  deemed  to  include  the  successors  and  permitted  assigns  of  such  party.    Nothing  in  this
Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors
and permitted assigns any rights, remedies, obligations or liabilities under or by reason of this Agreement, except as expressly
provided in this Agreement.  Neither party may assign its rights or obligations under this Agreement without the prior written
consent  of  the  other  party;  provided,  however,  that  the  Agent  may  assign  its  rights  and  obligations  hereunder  to  an  affiliate
thereof without obtaining the Company’s consent, so long as such affiliate is a registered broker-dealer and the Agent provides
advanced notice of such assignment to the Company.

15.

Adjustments for Stock Splits.  The parties acknowledge and agree that all share-related numbers contained in
this Agreement shall be adjusted to take into account any stock split, stock dividend or similar event effected with respect to the
Placement Shares.

16.

Entire Agreement; Amendment; Severability; Waiver.  This Agreement (including all schedules and exhibits
attached hereto and Placement Notices issued pursuant hereto) constitutes the entire agreement and supersedes all other prior and
contemporaneous agreements and undertakings, both written and oral, among the parties hereto with regard to the subject matter
hereof.  Neither this Agreement nor any term hereof may be amended except pursuant to a written instrument executed by the
Company and the Agent.  In the event that any one or more of the provisions contained herein, or the application thereof in any
circumstance, is held invalid, illegal or unenforceable as written by a court of competent jurisdiction, then such provision shall be
given full force and effect to the fullest possible extent that it is valid, legal and enforceable, and the remainder of the terms and
provisions herein shall be construed as if such invalid, illegal or unenforceable term or provision was not contained herein, but
only to the extent that giving effect to such provision and the remainder of the terms and provisions hereof shall be in accordance
with the intent of the parties as reflected in this Agreement. No implied waiver by a party shall arise in the absence of a waiver in
writing signed by such party. No failure or delay in exercising any right, power, or privilege hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any right,
power, or privilege hereunder.

-33-

 
 
 
17.

GOVERNING  LAW  AND  TIME;  WAIVER  OF  JURY  TRIAL.    THIS  AGREEMENT  SHALL  BE
GOVERNED  BY  AND  CONSTRUED  IN  ACCORDANCE  WITH  THE  LAWS  OF  THE  STATE  OF  NEW  YORK
WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS. SPECIFIED TIMES OF DAY REFER TO
NEW  YORK  CITY  TIME.    EACH  PARTY  HEREBY  IRREVOCABLY  WAIVES,  TO  THE  FULLEST  EXTENT
PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING  OUT  OF  OR  RELATING  TO  THIS  AGREEMENT  OR  THE  TRANSACTIONS  CONTEMPLATED
HEREBY.

18.

CONSENT  TO  JURISDICTION.  EACH  PARTY  HEREBY  IRREVOCABLY  SUBMITS  TO  THE
EXCLUSIVE JURISDICTION OF THE STATE AND FEDERAL COURTS SITTING IN THE CITY OF NEW YORK,
BOROUGH  OF  MANHATTAN,  FOR  THE  ADJUDICATION  OF  ANY  DISPUTE  HEREUNDER  OR  IN
CONNECTION  WITH  ANY  TRANSACTION  CONTEMPLATED  HEREBY,  AND  HEREBY  IRREVOCABLY
WAIVES, AND AGREES NOT TO ASSERT IN ANY SUIT, ACTION OR PROCEEDING, ANY CLAIM THAT IT IS
NOT PERSONALLY SUBJECT TO THE JURISDICTION OF ANY SUCH COURT, THAT SUCH SUIT, ACTION OR
PROCEEDING IS BROUGHT IN AN INCONVENIENT FORUM OR THAT THE VENUE OF SUCH SUIT, ACTION
OR PROCEEDING IS IMPROPER.  EACH PARTY HEREBY IRREVOCABLY WAIVES PERSONAL SERVICE OF
PROCESS AND CONSENTS TO PROCESS BEING SERVED IN ANY SUCH SUIT, ACTION OR PROCEEDING BY
MAILING  A  COPY  THEREOF  (CERTIFIED  OR  REGISTERED  MAIL,  RETURN  RECEIPT  REQUESTED)  TO
SUCH PARTY AT THE ADDRESS IN EFFECT FOR NOTICES TO IT UNDER THIS AGREEMENT AND AGREES
THAT  SUCH  SERVICE  SHALL  CONSTITUTE  GOOD  AND  SUFFICIENT  SERVICE  OF  PROCESS  AND  NOTICE
THEREOF.    NOTHING  CONTAINED  HEREIN  SHALL  BE  DEEMED  TO  LIMIT  IN  ANY  WAY  ANY  RIGHT  TO
SERVE PROCESS IN ANY MANNER PERMITTED BY LAW.

19.

Counterparts.  This Agreement may be executed in two or more counterparts, each of which shall be deemed
an original, but all of which together shall constitute one and the same instrument.  Delivery of an executed Agreement by one
party to the other may be made by facsimile or electronic transmission.

20.

Construction.    The  section  and  exhibit  headings  herein  are  for  convenience  only  and  shall  not  affect  the
construction  hereof.  References  herein  to  any  law,  statute,  ordinance,  code,  regulation,  rule  or  other  requirement  of  any
Governmental Authority shall be deemed to refer to such law, statute, ordinance, code, regulation, rule or other requirement of
any Governmental Authority as amended, reenacted, supplemented or superseded in whole or in part and in effect from time to
time and also to all rules and regulations promulgated thereunder.

21.

Permitted Free Writing Prospectuses.  The Company represents, warrants and agrees that, unless it obtains
the prior written consent of the Agent, which consent shall not be unreasonably withheld, condition or delayed, and the Agent
represents,  warrants  and  agrees  that,  unless  it  obtains  the  prior  written  consent  of  the  Company,  which  consent  shall  not  be
unreasonably withheld, condition or delayed, it has not made and will not make any offer

-34-

 
 
 
relating  to  the  Placement  Shares  that  would  constitute  an  Issuer  Free  Writing  Prospectus,  or  that  would  otherwise  constitute  a
“free writing prospectus,” as defined in Rule 405, required to be filed with the Commission.  Any such free writing prospectus
consented  to  by  the  Agent  or  by  the  Company,  as  the  case  may  be,  is  hereinafter  referred  to  as  a  “Permitted  Free  Writing
Prospectus.”  The Company represents and warrants that it has treated and agrees that it will treat each Permitted Free Writing
Prospectus  as  an  “issuer  free  writing  prospectus,”  as  defined  in  Rule  433,  and  has  complied  and  will  comply  with  the
requirements  of  Rule  433  applicable  to  any  Permitted  Free  Writing  Prospectus,  including  timely  filing  with  the  Commission
where  required,  legending  and  record  keeping.    For  the  purposes  of  clarity,  the  parties  hereto  agree  that  all  free  writing
prospectuses, if any, listed in Exhibit 21 hereto are Permitted Free Writing Prospectuses.

22.

Absence of Fiduciary Relationship.  The Company acknowledges and agrees that:

(a)

the Agent is acting solely as agent in connection with the public offering of the Placement Shares
and  in  connection  with  each  transaction  contemplated  by  this  Agreement  and  the  process  leading  to  such  transactions,  and  no
fiduciary or advisory relationship between the Company or any of its respective affiliates, stockholders (or other equity holders),
creditors  or  employees  or  any  other  party,  on  the  one  hand,  and  the Agent,  on  the  other  hand,  has  been  or  will  be  created  in
respect  of  any  of  the  transactions  contemplated  by  this  Agreement,  irrespective  of  whether  or  not  the Agent  has  advised  or  is
advising  the  Company  on  other  matters,  and  the  Agent  has  no  obligation  to  the  Company  with  respect  to  the  transactions
contemplated by this Agreement except the obligations expressly set forth in this Agreement;

conditions of the transactions contemplated by this Agreement;

(b)

it  is  capable  of  evaluating  and  understanding,  and  understands  and  accepts,  the  terms,  risks  and

neither  the  Agent  nor  its  affiliates  have  provided  any  legal,  accounting,  regulatory  or  tax  advice
with respect to the transactions contemplated by this Agreement and it has consulted its own legal, accounting, regulatory and tax
advisors to the extent it has deemed appropriate;

(c)

it is aware that the Agent and its affiliates are engaged in a broad range of transactions which may
involve  interests  that  differ  from  those  of  the  Company  and  the  Agent  and  its  affiliates  have  no  obligation  to  disclose  such
interests and transactions to the Company by virtue of any fiduciary, advisory or agency relationship or otherwise; and

(d)

(e)

it  waives,  to  the  fullest  extent  permitted  by  law,  any  claims  it  may  have  against  the Agent  or  its
affiliates for breach of fiduciary duty or alleged breach of fiduciary duty in connection with the sale of Placement Shares under
this Agreement and agrees that the Agent and its affiliates shall not have any liability (whether direct or indirect, in contract, tort
or otherwise) to it in respect of such a fiduciary duty claim or to any person asserting a fiduciary duty claim on its behalf or in
right of it or the Company, employees or creditors of Company.

23.

Definitions.  As used in this Agreement, the following terms have the respective meanings set forth below:

“Applicable Time” means (i) each Representation Date and (ii) the time of each sale of any Placement Shares pursuant

to this Agreement.

-35-

 
 
 
“Governmental  Authority”  means  (i)  any  federal,  provincial,  state,  local,  municipal,  national  or  international
government  or  governmental  authority,  regulatory  or  administrative  agency,  governmental  commission,  department,  board,
bureau,  agency  or  instrumentality,  court,  tribunal,  arbitrator  or  arbitral  body  (public  or  private);  (ii)  any  self-regulatory
organization; or (iii) any political subdivision of any of the foregoing.

“Issuer Free Writing Prospectus” means any “issuer free writing prospectus,” as defined in Rule 433, relating to the
Placement Shares that (1) is required to be filed with the Commission by the Company, (2) is a “road show” that is a “written
communication”  within  the  meaning  of  Rule  433(d)(8)(i)  whether  or  not  required  to  be  filed  with  the  Commission,  or  (3)  is
exempt from filing pursuant to Rule 433(d)(5)(i) because it contains a description of the Placement Shares or of the offering that
does not reflect the final terms, in each case in the form filed or required to be filed with the Commission or, if not required to be
filed, in the form retained in the Company’s records pursuant to Rule 433(g) under the Securities Act Regulations.

“Rule 164,” “Rule 172,” “Rule 405,” “Rule 415,” “Rule 424,” “Rule 424(b),” “Rule 430B,” and “Rule 433” refer to

such rules under the Securities Act Regulations.

All  references  in  this  Agreement  to  financial  statements  and  schedules  and  other  information  that  is  “contained,”
“included” or “stated” in the Registration Statement or the Prospectus (and all other references of like import) shall be deemed to
mean  and  include  all  such  financial  statements  and  schedules  and  other  information  that  is  incorporated  by  reference  in  the
Registration Statement or the Prospectus, as the case may be.

All references in this Agreement to the Registration Statement, the Prospectus or any amendment or supplement to any
of  the  foregoing  shall  be  deemed  to  include  the  copy  filed  with  the  Commission  pursuant  to  EDGAR;  all  references  in  this
Agreement to any Issuer Free Writing Prospectus (other than any Issuer Free Writing Prospectuses that, pursuant to Rule 433, are
not required to be filed with the Commission) shall be deemed to include the copy thereof filed with the Commission pursuant to
EDGAR;  and  all  references  in  this  Agreement  to  “supplements”  to  the  Prospectus  shall  include,  without  limitation,  any
supplements,  “wrappers”  or  similar  materials  prepared  in  connection  with  any  offering,  sale  or  private  placement  of  any
Placement Shares by the Agent outside of the United States.

[Signature Page Follows]

-36-

 
 
 
 
If the foregoing correctly sets forth the understanding between the Company and the Agent, please so indicate in the
space provided below for that purpose, whereupon this letter shall constitute a binding agreement between the Company and the
Agent.

Very truly yours,

SPERO THERAPEUTICS, INC.

By: /s/ Ankit Mahadevia, M.D.
  Name: Ankit Mahadevia, M.D.

Title: President and Chief Executive Officer

ACCEPTED as of the date first-above written:

CANTOR FITZGERALD & CO.

By: /s/ Sage Kelly
  Name: Sage Kelly

Title: Senior Managing Director, Head of

Investment Banking

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SCHEDULE 1

__________________________

Form of Placement Notice

__________________________

From:

 Spero Therapeutics, Inc.

To:

 Cantor Fitzgerald & Co.
Attention:                              

Subject:

 Placement Notice

Date:

Ladies and Gentlemen:

Pursuant to the terms and subject to the conditions contained in the Sales Agreement between Spero Therapeutics, Inc.,
a Delaware corporation (the “Company”), and Cantor Fitzgerald & Co. (“Agent”), dated March 11, 2021, the Company hereby
requests that the Agent sell up to [•] of the Company’s common stock, par value $0.001 per share, at a minimum market price of
$[•] per share, during the time period beginning [month, day, time] and ending [month, day, time].

Spero Therapeutics, Inc.

[Name, Title]

cc:

[other Spero notice parties]

 
 
 
 
  
 
  
 
  
                             
 
  
 
  
 
 
 
 
 
 
 
 
 
 
 
SCHEDULE 2

__________________________

Compensation

__________________________

The  Company  shall  pay  to  the  Agent  in  cash,  upon  each  sale  of  Placement  Shares  pursuant  to  this  Agreement,  an

amount equal to 3.0% of the aggregate gross proceeds from each sale of Placement Shares.

 
 
 
 
 
 
 
 
SCHEDULE 3

__________________________

Notice Parties

__________________________

The Company

Ankit Mahadevia, Chief Executive Officer

Sath Shukla, Chief Financial Officer

The Agent

Sameer Vasudev (svasudev@cantor.com)

Controlled Equity Offering Group (CFCEO@cantor.com)

 
 
 
 
 
SCHEDULE 7(l)

__________________________

Form of Representation Date Certificate Pursuant to Section 7(l)

__________________________

The undersigned, the duly qualified and elected [•], of Spero Therapeutics, Inc., a Delaware corporation (the “Company”),
does hereby certify in such capacity and on behalf of the Company, pursuant to Section 7(l) of the Sales Agreement, dated March
11, 2021 (the “Sales Agreement”), between the Company and Cantor Fitzgerald & Co., that to the best of the knowledge of the
undersigned:

(i)  The  representations  and  warranties  of  the  Company  in  Section  6  of  the  Sales  Agreement  (A)  to  the  extent  such
representations and warranties  are  subject  to  qualifications  and  exceptions  contained therein relating to materiality or Material
Adverse Effect, are true and correct on and as of the date hereof with the same force and effect as if expressly made on and as of
the date hereof, except for those representations and warranties that speak solely as of a specific date and which were true and
correct  as  of  such  date,  and  (B)  to  the  extent  such  representations  and  warranties  are  not  subject  to  any  qualifications  or
exceptions, are true and correct in all material respects as of the date hereof as if made on and as of the date hereof, except for
those representations and warranties that speak solely as of a specific date and which were true and correct in all material respects
as of such date; provided, however, that such representations and warranties also shall be qualified by the disclosure included or
incorporated by reference in the Registration Statement and Prospectus; and

(ii)  The  Company  has  complied  with  all  agreements  and  satisfied  all  conditions  on  its  part  to  be  performed  or  satisfied

pursuant to the Sales Agreement at or prior to the date hereof.

Capitalized terms used herein without definition shall have the meanings given to such terms in the Sales Agreement.

SPERO THERAPEUTICS, INC.

By:

Name:

Title:

Date: [•]

 
 
 
 
 
  
  
 
  
  
 
  
  
 
  
 
  
 
 
 
 
Form of Legal Opinion Pursuant to Section 7(m)

 
 
 
 
 
Exhibit 21

Permitted Free Writing Prospectus

None.

 
 
 
Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-228661) and Form S-8 (Nos. 333-230283, 333-
230281, 333-222060, 333-237283, and 333-241681) of Spero Therapeutics, Inc. of our report dated March 11, 2021 relating to the financial statements,
which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
March 11, 2021

 
 
 
 
 
Exhibit 31.1

I, Ankit Mahadevia, M.D., certify that:

1.  I have reviewed this annual report on Form 10-K of Spero Therapeutics, Inc.;

CERTIFICATIONS UNDER SECTION 302

2.  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact

necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
the period covered by this report;

3.  Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all

material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this
report;

4.  The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and

procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange
Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)  designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our

supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

b)  designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed

under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions

about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the

registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.  The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over

financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the
equivalent functions):

a)  all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which

are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)  any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s

internal control over financial reporting.

Date: March 11, 2021

/s/ Ankit Mahadevia, M.D.
Ankit Mahadevia, M.D.
President and Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
Exhibit 31.2

I, Satyavrat Shukla, certify that:

1.  I have reviewed this annual report on Form 10-K of Spero Therapeutics, Inc.;

CERTIFICATIONS UNDER SECTION 302

2.  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact

necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
the period covered by this report;

3.  Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all

material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this
report;

4.  The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and

procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange
Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)  designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our

supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

b)  designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed

under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions

about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;
and

d) disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the

registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.  The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over

financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the
equivalent functions):

a)  all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which

are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)  any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s

internal control over financial reporting.

Date: March 11, 2021

/s/ Satyavrat Shukla
Satyavrat Shukla
Chief Financial Officer and Treasurer
(Principal Financial Officer and Principal Accounting Officer)

 
 
 
 
 
CERTIFICATIONS UNDER SECTION 906

Exhibit 32

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United
States Code), each of the undersigned officers of Spero Therapeutics, Inc., a Delaware corporation (the “Company”), does hereby certify, to
such officer’s knowledge, that:

The Annual Report for the year ended December 31, 2020 (the “Form 10-K”) of the Company fully complies with the

requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-K fairly
presents, in all material respects, the financial condition and results of operations of the Company.

Dated: March 11, 2021

Dated: March 11, 2021

/s/ Ankit Mahadevia, M.D.
Ankit Mahadevia, M.D.
President and Chief Executive Officer
(Principal Executive Officer)

/s/ Satyavrat Shukla
Satyavrat Shukla
Chief Financial Officer and Treasurer
(Principal Financial Officer and Principal Accounting Officer)