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X4 Pharmaceuticals, Inc.

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FY2019 Annual Report · X4 Pharmaceuticals, 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

_____________________________________________________________________________________

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

For the fiscal year ended December 31, 2019

or

For the transition period from to
Commission File Number: 001-38295
_________________________________________________________________________________________________________

X4 PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)
________________________________________________________________________________________________________

Delaware
(State or other jurisdiction of
incorporation or organization)

955 Massachusetts Avenue, 4th Floor
Cambridge, Massachusetts
(Address of principal executive offices)

27-3181608
(I.R.S. Employer
Identification No.)

02139
(Zip Code)

(857) 529-8300
(Registrant’s telephone number, including area code)
_____________________________________________________________________________________

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

Title of each class
Common Stock

Trading Symbol(s)
XFOR

Name of each exchange on which registered
The Nasdaq Stock Market LLC

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 Section 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 (of this chapter) during the preceding 12 months (of
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 is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

On June 30, 2019, the aggregate market value of the Registrant’s voting common stock held by non-affiliates of the registrant was approximately $183,715,365 based upon the closing sale price on the Nasdaq Capital
Market reported on June 28, 2019.

As of March 6, 2020, there were 16,134,495 shares of the registrant’s common stock, $0.001 par value per share outstanding.

DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s definitive proxy statement, or the 2020 Proxy Statement, for its 2020 Annual Meeting of Stockholders, which the registrant intends to file pursuant to Regulation 14A
with the Securities and Exchange Commission not later than 120 days after the registrant's fiscal year ended December 31, 2019, are incorporated by reference into Part III of this Annual Report
on Form 10-K.

Table of Contents

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.

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
DISCLOSURES 
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 AND FINANCIAL STATEMENT SCHEDULES
FORM 10-K SUMMARY

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EXPLANATORY NOTE

On March 13, 2019, X4 Pharmaceuticals, Inc. (formerly Arsanis, Inc.), or the Company, completed its business combination, or the Merger, in accordance
with the terms of the Agreement and Plan of Merger, dated as of November 26, 2018, as amended on December 20, 2018 and March 8, 2019, or the Merger
Agreement, by and among the Company, X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and Artemis AC Corp., a Delaware corporation and a
wholly-owned subsidiary of the Company, or the Merger Sub, pursuant to which, among other matters, Merger Sub merged with and into X4 Therapeutics,
Inc., with X4 Therapeutics, Inc. continuing as a wholly-owned subsidiary of the Company and the surviving corporation of the merger. Following the
Merger, on March 13, 2019, the Company effected a 1-for-6 reverse stock split of its common stock, or the Reverse Stock Split, and changed its name to
“X4 Pharmaceuticals, Inc.” Following the completion of the Merger, the business conducted by X4 Pharmaceuticals Inc. became primarily the business
conducted by X4 Therapeutics, Inc., a clinical-stage biopharmaceutical company focused on the research, development and commercialization of novel
therapeutics for the treatment of rare diseases.

Unless otherwise noted, all references to common stock share and per share amounts in this Annual Report on Form 10-K have been retroactively adjusted
to reflect the conversion of shares in the Merger based on an exchange ratio of 0.5702 and the Reverse Stock Split.

Unless the context requires otherwise, references in this Annual Report on Form 10-K to "X4", "we", "us" and "our" refer to X4 Pharmaceuticals, Inc. and
its subsidiaries.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities
Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, that relate to future events or to our future operations or
financial  performance.  These  statements  may  be  identified  by  such  forward-looking  terminology  as  “may,”  “should,”  “expects,”  “intends,”  “plans,”
“anticipates,”  “believes,”  “estimates,”  “predicts,”  “potential,”  “continue”  or  the  negative  of  these  terms  or  other  comparable  terminology.  Our  forward-
looking statements are based on a series of expectations, assumptions, estimates and projections about our company, are not guarantees of future results or
performance and involve substantial risks and uncertainty. We may not actually achieve the plans, intentions or expectations disclosed in these forward-
looking  statements.  Actual  results  or  events  could  differ  materially  from  the  plans,  intentions  and  expectations  disclosed  in  these  forward-looking
statements. These risks, uncertainties and other factors are described in greater detail under the caption “Risk Factors” contained in this Annual Report.

Our  business  and  our  forward-looking  statements  involve  substantial  known  and  unknown  risks  and  uncertainties,  including  the  risks  and  uncertainties
inherent in our statements regarding:

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the progress, scope, cost, duration or results of our development activities, nonclinical studies and clinical trials of
mavorixafor (X4P-001), X4P-002 and X4P-003 or any of our other product candidates or programs, such as the target indication(s)
for development, the size, design, population, conduct, cost, objective or endpoints of any clinical trial, or the timing for initiation or
completion of or availability of results from any clinical trial, including our current and planned trials for mavorixafor in Warts,
Hypogammaglobulinemia, Infections, and Myelokathexis, or WHIM, syndrome, severe congenital neutropenia, or SCN, and
Waldenström macroglobulinemia, or WM, for submission or approval of any regulatory filing or for meeting with regulatory
authorities;

the potential benefits that may be derived from any of our product candidates;

the timing of and our ability to obtain and maintain regulatory approval of our existing product candidates or any product candidates
that we may develop in the future, and any related restrictions, limitations, or warnings in the label of any approved product
candidates;

our plans to research, develop, manufacture and commercialize our product candidates;

the timing of our regulatory filings for our product candidates, along with regulatory developments in the United States and other
foreign countries;

the size and growth potential of the markets for our product candidates, if approved, and the rate and degree of market acceptance of
our product candidates, including reimbursement that may be received from payors;

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our commercialization, marketing and manufacturing capabilities and strategy;

our ability to attract and retain qualified employees and key personnel;

our competitive position;

our expectations regarding our ability to obtain and maintain intellectual property protection;

the success of competing therapies that are or may become available;

our estimates and expectations regarding future operations, financial position, revenues, costs, expenses, uses of cash, capital
requirements or our need for additional financing;

our ability to raise additional capital; and

our strategies, prospects, plans, expectations or objectives.

You should refer to "Risk Factors" for a discussion of important factors that may cause our actual results to differ materially from those expressed or
implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this Annual Report
will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant
uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we
will achieve our objectives and plans in any specified time frame, or at all. We undertake no obligation to publicly update any forward-looking statements,
whether as a result of new information, future events or otherwise, except as required by law. You should, therefore, not rely on these forward-looking
statements as representing our views as of any date subsequent to the date of this Annual Report.

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ITEM 1.  BUSINESS

PART I

Overview
We are a clinical-stage biopharmaceutical company and a leader in the discovery and development of novel therapies for the treatment of diseases resulting
from dysfunction of the CXCR4 pathway, with a focus on rare diseases with limited treatment options. We are led by an executive team with deep expertise
in the science of the CXCR4 pathway and significant experience in the successful development and commercialization of therapeutics targeting rare
diseases. Our lead therapeutic candidate, mavorixafor, is a first-in-class, oral small molecule inhibitor of the CXCR4 receptor, that we believe has the
potential to treat a broad array of diseases, including primary immunodeficiencies, or PIs, and certain types of cancer.

Having established proof of concept and a favorable safety profile in a Phase 2 clinical trial, we initiated 4WHIM, a global Phase 3 clinical trial evaluating
the safety and efficacy of mavorixafor for the treatment of patients with WHIM syndrome. WHIM syndrome is a rare, inherited, primary
immunodeficiency disease caused by genetic "gain of function" mutations in the CXCR4 receptor gene and named for its characteristic symptoms and
some of its laboratory findings: Warts, Hypogammaglobulinemia, Infections, and Myelokathexis. Mavorixafor was granted Breakthrough Therapy
Designation by the U.S. Food and Drug Administration, or FDA, for the treatment of adult patients with WHIM syndrome in 2019. It was also granted
orphan drug designation by the FDA in 2018 and by the European Commission in 2019 for the treatment of WHIM syndrome. We currently expect to
report top-line results from 4WHIM in the second half of 2021.

We are also conducting Phase 1b clinical trials in two additional indications. The first clinical trial is investigating the safety and efficacy of mavorixafor in
patients with Severe Congenital Neutropenia, or SCN, and severe idiopathic neutropenia, a group of rare blood disorders characterized by abnormally low
levels of white blood cells, or neutrophils. The second clinical trial is a dose escalation, safety and preliminary efficacy trial in patients with Waldenström’s
macroglobulinemia, or WM, a rare form of non-Hodgkin’s lymphoma in which abnormal white blood cells produce an excess of monoclonal
immunoglobulin M, or IgM, which can result in symptoms of anemia, hyper viscosity, neuropathy, or other complications. Approximately 30-40% of
patients with WM have a somatic mutation in the CXCR4 receptor suggesting a potential targeted approach to treatment with mavorixafor in combination
with the standard BTK inhibitor (Ibrutinib) therapy. We are expecting the initial data results from each of these trials during the second half of 2020.

During 2019, we reported promising data from the Phase 2a portion of an open-label Phase 1/2 clinical trial studying mavorixafor for the treatment of
patients with advanced clear cell renal cell carcinoma, or ccRCC, in combination with axitinib, an FDA-approved small molecule tyrosine kinase inhibitor.
Future development and potential commercialization of mavorixafor in ccRCC in addition to other possible immuno-oncology indications will be pursued
only as part of a potential strategic collaboration. .

We are also advancing two early stage candidates towards the clinic: X4P-003, a second-generation CXCR4 antagonist designed to have an enhanced
pharmacokinetic profile relative to mavorixafor, potentially enabling improved patient compliance and ease of use; and X4P-002, a CXCR4 antagonist
designed to cross blood-brain barrier and provide appropriate therapeutic exposures to treat brain cancers.

We continue to leverage our insights into CXCR4 biology at our corporate headquarters located in Cambridge, Massachusetts and at our research facility in
Vienna, Austria to discover and develop additional product candidates.

Our CXCR4 Platform
CXCR4, or C-X-C receptor type 4, is a G-coupled protein receptor, or GCPR, and its sole ligand is the chemokine CXCL12. Chemokines are signaling
proteins that guide the migration of immune cells within the body by binding to receptors on the surface of target cells. When CXCR4 is stimulated by
CXCL12, it plays a key role in enabling the trafficking of immune cells and effective immunosurveillance, or the process by which cells of the immune
system look for and recognize foreign pathogens or precancerous and cancerous cells in the body (see Figure 1).

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Figure 1: CXCL12/CXCR4 and Immune System Responses.

When the CXCL12/CXCR4 pathway is overstimulated, immune cells become immobilized, which can lead to immunosuppression and other complications
from immune system dysfunction.

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In the case of primary immunodeficiencies, such as WHIM syndrome, overstimulation of the pathway is caused by mutations in the CXCR4
receptor, called “gain of function” mutations, that immobilize white blood cells in the bone marrow where they are produced and dramatically
impact their ability to move into the blood and circulate throughout the body to perform immunosurveillance.
In other diseases, including many types of cancer, the CXCL12/CXCR4 pathway has been found to broadly play a role in disrupted immune cell
trafficking, particularly in the tumor microenvironment, or TME, where there often exists an abnormally high concentration of the ligand
CXCL12. Evidence suggests that the pro-tumor signals between tumor cells and cancer-associated fibroblasts occur partly through chemokine
signaling, including through the over-production of CXCL12, which results in immunosuppression within the tumor microenvironment.

We believe that the inhibition of the CXCL12/CXCR4 signaling pathway has the potential to improve immune cell trafficking and immunosurveillance and
create therapeutic benefit across a wide variety of diseases.

We also believe that our approach to inhibiting the CXCR4 receptor has been validated by the FDA-approved product plerixafor for injection (marketed as
Mozobil). Plerixafor is a CXCR4 antagonist that has been shown to induce white blood cell mobilization and is used as an injectable therapy for short-term
treatment in preparation for stem-cell transplants. In a published investigator-sponsored pilot study of WHIM patients, twice-daily injections of low-dose
plerixafor demonstrated increased white blood cell counts and reduced infections and wart lesions. Plerixafor is not approved for the treatment of WHIM
syndrome nor are we aware of any plans to develop and commercialize it as a treatment for patients with WHIM syndrome or any other
immunodeficiencies.

Our leadership team has considerable experience in the research, development, and commercialization of therapies to treat rare diseases, including therapies
that target chemokine pathways and the CXCR4 pathway specifically. Paula Ragan, Ph.D., our Chief Executive Officer, led the licensing of the CXCR4
antagonist portfolio from Sanofi-Genzyme and coordinated all phases of the transfer of the knowledge and know-how needed to launch our company. Our
co-founder and our current Senior Vice President of Research and Development, Renato Skerlj, Ph.D., is very experienced in the discovery and
development of small molecule drugs targeting rare diseases, cancer, infection, and neurodegenerative disease, and is an inventor of plerixafor. Two
members of our Board of Directors also have deep roots in our differentiated chemokine approach, including Gary J. Bridger, Ph.D., who was responsible
for the discovery and development of plerixafor as a co-founder and Chief Scientific Officer of AnorMED Inc., until

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the company’s acquisition by Genzyme in 2006, and Michael S. Wyzga, Chairman of our Board of Directors, who was the Chief Financial Officer of
Genzyme during the approval, global launch, and subsequent commercialization of plerixafor. We believe that the experience of our leadership team
provides our company with unique insights into product development and commercialization processes and the identification of opportunities involving
CXCR4 biology.

Our Strategy
Our goal is to discover, develop, and commercialize novel therapeutics that address diseases resulting from dysfunction of the CXCR4 pathway by:

• Completing the global Phase 3 clinical trial to enable the approval of mavorixafor for the treatment of patients with WHIM syndrome. To
date, we have completed a Phase 2 clinical trial of mavorixafor in patients with WHIM syndrome, achieving clinical proof-of-concept, observing a
clinically meaningful increase in neutrophil and lymphocyte counts, and demonstrating a favorable tolerability profile. We have initiated a Phase 3
pivotal clinical trial, the 4WHIM trial, and are currently enrolling patients, with top-line data expected in the second half of 2021.

• Driving community awareness of WHIM syndrome and building patient registries. We are building our efforts to increase awareness of

underserved serious rare diseases, including WHIM syndrome, among patients, physicians, and their support systems. In addition to sponsored
market research and outreach, we have partnered with key patient foundations and registries, including the Jeffrey Modell Foundation, University
of Washington, Immune Deficiency Foundation, and Hopitaux Universitaires Est Parisien (Trousseau La Roche-Guyon). In addition, we have
deployed a field force of Medical Science Liaisons, or MSLs, in the United States to further drive education and awareness of WHIM syndrome.
We plan to leverage our relationship with our partner organizations and patient registries along with our MSL team in the United States to increase
patient and physician awareness of our ongoing trials, supporting study enrollment and completion.

• Advancing mavorixafor in additional indications. To maximize the potential of mavorixafor, we have initiated two Phase 1b clinical trials – one
trial investigating the safety and efficacy of mavorixafor in patients with SCN and another trial investigating the safety, appropriate dose and
preliminary efficacy of mavorixafor in patients with Waldenström’s macroglobulinemia. We are expecting the initial data results from each of
these studies during the second half of 2020.

• Advancing earlier-stage product candidates and leveraging insights into CXCR4 biology to further expand our pipeline. We have advanced
a late lead optimization program into candidate drug nomination: X4P-003, a second-generation CXCR4 antagonist designed to have an enhanced
pharmacokinetic profile relative to mavorixafor, potentially enabling improved patient compliance and ease of use. A second program is in lead
optimization: X4P-002, a CXCR4 antagonist designed to cross the blood-brain barrier and provide appropriate therapeutic exposures to treat brain
cancers. In addition, we are also leveraging our insights into CXCR4 biology and our research capabilities to identify other targets and develop
additional product candidates.

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Independently commercializing our product candidates in certain indications and geographies where we believe we can maximize value.
Given the potential of our product candidates to treat a wide variety of diseases, we believe that it will be important to maintain our leadership role
with respect to our development and commercialization efforts. We plan to independently develop therapeutic candidates in indications, including
rare diseases, where we believe there is a well-defined clinical and regulatory approval pathway and ones that we believe we could successfully
commercialize, if approved.

Pursuing additional strategic collaborations for mavorixafor in immuno-oncology indications. Currently, we have an ongoing strategic
collaboration under which we have licensed mavorixafor rights in China to Abbisko, a privately-held immuno-oncology research and development
company. Additionally, we intend to pursue strategic collaborations for future development and potential commercialization of mavorixafor in
solid tumor immuno-oncology indications in other global regions in order to maximize the value of that asset while we maintain our focus on
developing mavorixafor for the treatment of rare diseases.

Our Programs
We are advancing a pipeline of clinical and pre-clinical oral, small molecule candidates that target diseases resulting from the dysfunction of the CXCR4
pathway, including primary immunodeficiencies and certain types of cancer.

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Mavorixafor
Our lead product candidate is mavorixafor, a first-in-class, oral, selective small molecule CXCR4 antagonist that allosterically, or non-competitively,
inhibits receptor binding by CXCL12, the cognate ligand of CXCR4. Mavorixafor is designed to correct the abnormal signaling caused by the dysfunction
of the receptor/ligand interaction and enable mobilization and trafficking of immune cells, increasing levels of circulating white blood cells, including
neutrophils, to improve immune system function.

To date, more than 190 patients in clinical trials have been dosed with mavorixafor, which has demonstrated a favorable tolerability profile. In these trials,
we have observed drug exposure in patients, a 23-hour half-life, and the bioavailability of mavorixafor to support once-daily oral dosing, which we believe
will provide convenient dosing and better patient compliance for chronic or life-long use, if approved. The manufacturing process for mavorixafor utilizes
well established small molecule chemistry, enabling a potential commercial product that can be supported by specialty pharmacy distribution.

Mavorixafor in WHIM Syndrome
Primary Immunodeficiencies, or PIs, are a group of more than 300 rare, chronic disorders in which flaws in the immune system cause increased
susceptibility to infections and, in some cases, increased risk of cancers. Within this broad disease classification, WHIM syndrome is one of a number of
PIs that are caused by the improper trafficking of immune cells. WHIM syndrome is a rare genetic disease that results from “gain of function” mutations in
the single gene that encodes for the CXCR4 receptor. The first of these mutations were identified in 2003. Since then, a total of 11 different CXCR4
mutations have been identified as causing WHIM syndrome. All but one of these mutations cause premature truncations in the protein, causing the receptor
to signal for longer than normal, which results in the retention of white blood cells in the bone marrow where they are produced, and leads to the chronic
peripheral neutropenia and lymphopenia that is the observed clinical hallmark of WHIM syndrome.

The incidence and prevalence of WHIM syndrome are not well established. We believe that this is due to the relatively recent understanding of the genetics
underlying WHIM syndrome, lack of universal or accessible genetic testing, and limited medical education and awareness of the disease, which is in part
driven by the lack of available and disease-modifying treatments. The National Organization for Rare Diseases, or NORD, has reported the incidence of
WHIM syndrome to be less than one in 1,000,000 based on a single small registry of eight patients in France. Based on a preliminary independent market
research study that we sponsored in the United States, which was conducted by a third party research firm, we believe that the prevalence of WHIM
syndrome worldwide is significantly higher than the incidence statistics implied by the France-based registry. The study solicited input from community-
based physicians of different specialties, including physicians focused on non-malignant hematology, immunology, dermatology, pulmonology and
infectious diseases, who are known to manage and/or treat patients

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with WHIM syndrome. The 212 physicians across these specialties in the United States identified to participate in this study reported over 1,700 patients
have genetically confirmed or are highly suspected to have WHIM syndrome in the United States alone. The results of this initial study support our
estimate of more than 1,000 genetically confirmed WHIM patients in the United States.

Figure 2 illustrates the mutations in the CXCR4 receptor leading to abnormal signaling and retention of white blood cells in the bone marrow that occurs in
WHIM patients. Figure 2 also depicts our approach to blocking this abnormal signaling using our CXCR4 antagonist candidate, mavorixafor, which is
designed to enable white blood cells to release into the bloodstream, restoring normal immune function. In healthy individuals, the CXCR4 receptor is
typically internalized into the cell after CXCL12 binds to it, enabling the receptor to be appropriately “recycled” and the signaling to be diminished. In
WHIM patients, however, a mutation truncates the intracellular portion of the CXCR4 receptor as shown by the red “x” below, which prevents the post-
binding internalization (“normal recycling”) of the receptor. As a result, the CXCR4 receptor is maintained on the surface of the cell and is exposed to the
ligand, which creates a perpetual “on” signaling and immobilizes the cell. Mavorixafor binds to the mutated CXCR4 receptor in a manner that blocks the
receptor from being stimulated by CXCL12 regardless of the presence of the ligand, and results in increased mobilization and trafficking of white blood
cells from the bone marrow.

Figure 2. WHIM Syndrome: Genetic Mutations in CXCR4 Create Abnormal Trafficking of White Blood Cells

In addition to life-long neutropenia and lymphopenia, WHIM patients can clinically present with other manifestations of the disease, such as warts related
to infection with the Human Papilloma Virus, or HPV. Based on publications from the French Severe Congenital Neutropenia Registry and the broader
literature, it is estimated that between 30% and 40% of WHIM patients develop HPV-associated cancers as they age. Patients may also demonstrate low
immunoglobulin, or IG, levels, also known as hypogammaglobulinemia and pathology assessments of bone marrow samples (aspirates) of patients with
WHIM syndrome show a “hyper-dense” population of pre-apoptotic immune cells in the bone marrow, a condition known as myelokathexis. These
conditions reduce the body’s ability to achieve a healthy immune response.

For a diagnosis of WHIM syndrome, all four classic characteristics of warts, hypogammaglobulinemia, infections and myelokathexis, do not need to be
present, which complicates the diagnosis of these patients. Genetic testing is used to definitively diagnose WHIM syndrome by confirming the presence of
an autosomal dominant mutation in the CXCR4 receptor where only one mutated gene need be affected to cause the disorder. The diagnosis of WHIM
syndrome may occur at any age: about one-half of reported patients are diagnosed as adults, mostly between 18 and 40 years of age, with the other half
diagnosed primarily before or at the age of 18 years.

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Clinical Development of Mavorixafor in WHIM Syndrome
In January 2017, we initiated a Phase 2 clinical trial of mavorixafor for the treatment of patients with WHIM syndrome. This trial was an open-label, dose-
escalation trial in eight WHIM patients conducted at two sites in the United States and Australia pursuant to an Investigational New Drug, or IND,
application that we submitted to the FDA in June 2016. The primary objective of the Phase 2 clinical trial was to determine the safety and tolerability of
mavorixafor and to determine the dose of mavorixafor for exploration in a Phase 3 pivotal clinical trial. The secondary objective of the Phase 2 trial was to
evaluate the potential efficacy of mavorixafor in patients with WHIM syndrome by measuring biomarkers, specifically absolute neutrophil and lymphocyte
counts, or ANCs and ALCs, over 24-hour dosing cycles. The frequency of infections, antibiotic use, hospitalizations, severity of warts lesions, and vaccine
titer levels, among other metrics, were also examined. To be included in the trial, patients must have had a confirmed genetic diagnosis of WHIM
syndrome, be at least 18 years of age and have a neutrophil count equal to or less than 400/µL or a lymphocyte count equal to or less than 650/µL. Patients
who had been infected with the human immunodeficiency virus, or HIV, were excluded from the trial, as were patients with recent exposure to plerixafor.

In the trial, patients received escalating doses of mavorixafor starting at 50 mg once daily to up to 400 mg once daily. Patients received starting doses
higher than 50 mg once daily as the trial progressed based on the safety and biomarker response data of earlier patients enrolled in the trial. Patients were
dose-escalated from their starting dose based on an in-hospital 24-hour measurement of ANCs and ALCs above or below the pre-defined target thresholds
of 600/µL and 1,000/µL, respectively. Results were as follows:

• Mavorixafor was not associated with any treatment-related serious adverse events and was observed to be well tolerated in daily doses of up to
400 mg for durations of up to 400 days. Treatment-related adverse events reported were dry mouth (n=2), nausea (n=4), dry eye (n=1), nasal
dryness (n=2), dyspepsia (n=1), conjunctivitis (n=1) and rash (n=1). All adverse events were Grade 1 (mild).

•

• ANCs were increased in total numbers (cells//µL) as well as duration of increase (hours) over the course of the intra-day assessment. The increase
in ANCs vs. pre-dosing levels was observed in all (n=7) evaluable patients in the trial. In five of seven patients (71%), ANCs were consistently
elevated above the pre-defined target threshold of 600/µL at peak as well as throughout the 24 hour assessment period.
Similarly, ALCs were increased in total numbers (cells/ µL) as well as duration of increase with the treatment of mavorixafor. The increase in
ALCs were observed in all (n=7) evaluable patients with six of seven patients (86%) exceeding the pre-defined target threshold of 1,000/µL for
ALCs (the lower limit of normal) throughout the 24-hour assessment period. These thresholds of 600/µL for ANCs and 1,000/µL for ALCs
correspond to the National Cancer Institute’s adverse event grading system, which considers ANCs below 500/µL to be severe or life threatening
and ALCs of 1,000/µL within the range of healthy individuals.
Patients experienced improved infection rates, as reported by patients and the trial investigators.
Significant and visible reductions in wart lesions were also reported in a patient with a history of untreatable severe wart lesions.

•
•

We completed the dose-titration portion of the Phase 2 trial in March 2018 and, based on the reported results, the Data Review Committee, or DRC,
recommended the Phase 3 dose of 400 mg administered once daily based on these results. Following completion of the dose-titration portion of the Phase 2
trial, patients were allowed to continue on study drug in a Phase 2 open-label extension trial. As of February 2020, three patients continue to receive
mavorixafor in the open-label extension trial.

In June 2019, we initiated 4WHIM, a global, Phase 3 pivotal clinical trial investigating the safety and efficacy of mavorixafor in genetically confirmed
WHIM patients. 4WHIM trial is a 52-week, randomized, double-blind, placebo-controlled, multicenter study designed to evaluate the safety and efficacy of
mavorixafor in genetically confirmed WHIM patients. The trial is designed to enroll up to 28 subjects in approximately 20 countries, followed by an open-
label extension trial. The primary efficacy endpoint for the trial will compare the time above threshold, or TAT, defined as the number of hours that
circulating neutrophils are above a clinically meaningful threshold (500 cells/µL), in response to mavorixafor versus placebo as measured during a 24-hour
period. Patients will be assessed for his or her neutrophil TAT approximately once every three months (4 times in total) over the course of the 52 week
treatment period. Secondary endpoints include infection rates, wart burden, and assessments of immune system function and quality of life. Upon
completion of the treatment period, patients will be eligible to participate in an open-label extension, or OLE, and receive mavorixafor until the drug is
commercially available.

We currently expect to report top-line data from this Phase 3 trial in the second half of 2021. If the Phase 3 pivotal clinical trial is successful, we believe
that this trial will be the only registration trial required to submit a New Drug Application, or NDA, to the FDA seeking regulatory approval in the United
States. Mavorixafor was granted Breakthrough Therapy Designation by the FDA

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for the treatment of adult patients with WHIM syndrome in 2019, and was granted orphan drug designation by the FDA in 2018 and by the European
Commission in 2019 for the treatment of WHIM syndrome.

Limited Current Treatment Landscape for WHIM Syndrome
Currently, there are no approved targeted therapies for the treatment of WHIM syndrome and care is limited to the treatment of the syndrome’s different
symptoms. The care of WHIM patients is mainly focused on the prevention and management of infections. None of these treatments, however, have been
clinically proven to be effective for treating WHIM syndrome nor do they address the underlying cause of this multi-faceted disease, the genetic defect of
the CXCR4 receptor. Current symptoms and their limitations are as follows:

• Warts: The presence of warts in WHIM syndrome is driven by an underlying HPV infection. Standard treatments, such as topical therapies (for
example, imiquimod and salicylic acid), cryotherapy and laser therapy, as well as more aggressive approaches, such as cauterization or surgical
removal, have been ineffective in providing durable treatment of warts associated with chronic HPV infections. As WHIM patients generally have
limited response to vaccines, the HPV vaccine appears to have limited effectiveness. The number, size and severity of visible warts in WHIM
patients can have a significant negative impact on the patient’s quality of life and result in social anxiety issues. Left untreated, chronic HPV-
infections are also known to increase the risk of cancer. Patients with WHIM syndrome are reported to have more frequent occurrences of difficult
to treat HPV-associated cancers, such as head and neck and anogenital cancers.

• Hypogammaglobulinemia: Intravenous or subcutaneous Ig administration, referred to as IVIg or SCIg, respectively, can be administered to
patients with low Ig levels. In WHIM patients, the administration of Ig therapies raises Ig levels, but has shown no impact on circulating
leukocytes and limited or no impact on immune responses. Ig treatment of patients with WHIM syndrome is based on empirical and anecdotal
evidence, and there are no clinical data demonstrating the efficacy of Ig treatment for WHIM syndrome. Ig treatment also does not treat or protect
against HPV-associated symptoms and diseases, such as warts and certain cancers. Furthermore, Ig administration is costly and time consuming.

•

Infections: Bacterial infections are managed with antibiotics. Acute infections usually resolve, although we are aware of reports from clinicians
citing death due to pneumonia or sepsis in young WHIM patients. Importantly, even with antibiotic use, infections recur more frequently and
persist longer in patients with WHIM syndrome. Further, the toll of multiple, chronic infections in WHIM patients has been known to lead to
devastating irreversible pathologies such as hearing loss due to chronic ear infections and bronchiectasis. Patients are sometimes given a
granulocyte-colony stimulating factor, or G-CSF, to increase neutrophil counts, but G-CSF has demonstrated little, if any, impact on lymphopenia
or the incidence of infections in WHIM patients. In a small registry of eight WHIM patients in France, three of the four patients who received G-
CSF continued to have persistent, repeated infections. Side effects of G-CSF have been reported to include disabling bone pain, which can be
more severe in certain age groups. Additional, less common, treatment-limiting complications of chronic G-CSF administration include
myelofibrosis and leukemia.

• Myelokathexis: G-CSF is sometimes used to treat the myelokathexis characteristic of WHIM syndrome to try to increase the number of

neutrophils outside of the bone marrow, but G-CSF has no effect on lymphocytes and other types of white blood cells. Side effects of G-CSF can
include disabling bone pain, myelofibrosis and leukemia.

While the costs of managing the chronic impact of WHIM syndrome are unknown, the per-patient cost of treating PIs that are similar to WHIM syndrome
based on drug costs alone exceeds $100,000 per year in the United States utilizing similar therapies, such as antibiotics, IVIg, SCIg and/or G-CSF, despite
the limited effectiveness of these treatments. Beyond these estimated direct costs, other costs associated with direct and indirect management of the disease,
such as repeated immunization, physician visits, or hospitalizations, have not been quantified but are likely to be significant. We believe that there is a
significant need for a treatment targeting the underlying excessive signaling caused by mutations to the CXCR4 receptor, which is the established cause of
WHIM syndrome.

Mavorixafor in SCN
We believe that mavorixafor may be used to treat a number of additional PIs beyond WHIM syndrome. Particularly, we believe that mavorixafor can
potentially treat patients with severe congenital neutropenia, or SCN. Like WHIM syndrome, SCN is a rare blood disorder similarly characterized by
increased risks of infections and cancer due to abnormally low levels of neutrophils in the body. Additionally, some sub-types of SCN have mechanisms
that overlap with signaling of the CXCL12/CXCR4 pathway. Affecting an estimated 2,000 to 3,000 people in the United States and Europe, patients with
SCN are prone to recurrent, often life-threatening infections beginning in their first months of life.

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G-CSF is the current standard of care for SCN and is used to stimulate the bone marrow to produce neutrophils. Side effects of G-CSF include disabling
bone pain, which can be more severe in certain age groups. Additional, less common, treatment-limiting complications of chronic G-CSF administration
include myelofibrosis and leukemia. In SCN cases that are unresponsive to G-CSF, or if leukemia has developed, bone marrow transplants have been made
with varying degrees of success. Bone marrow transplants bring additional risks into the management of the disorder.

In November 2019, we initiated a Phase 1b clinical trial, a 14-day, proof-of-concept trial designed to assess the safety and tolerability of daily, oral
mavorixafor in participants with SCN and other selected congenital neutropenia disorders. In addition, the trial will evaluate the neutrophil response in this
patient population as an independent agent or in combination with G-CSF. The trial is expected to enroll up to 45 patients in total, with initial data results
anticipated in the second half of 2020.

Mavorixafor in Waldenström's macroglobulinemia
We believe that mavorixafor may be used to treat certain blood cancers, including Waldenström's macroglobulinemia, or WM. WM, is a rare form of non-
Hodgkin’s lymphoma and B-cell lymphoproliferative disorder most often caused by mutations in a gene for MYD88. The WM landscape has recently been
revolutionized by whole-genome sequencing that has identified genetic mutations in the disease, including secondary mutations in CXCR4. Approximately
30-40% of all WM patients have been shown to have second mutation, a somatic WHIM-like mutation in the CXCR4 gene in the cancer cells that define
this rare form of lymphoma. Mutational status influences both clinical presentation and prognosis as well as provides potential implications for therapeutic
options. Patients with the CXCR4 mutations have higher serum IgM levels and greater incidence of symptomatic hyperviscosity. These patients also have a
worse prognosis.

In WM, somatic mutations of CXCR4 have been found to be associated with activating and pro-survival signaling of tumor cells, as well as the possible
acquisition of resistance to several drugs, including anti-CD20 monoclonal antibody, and BTK inhibitors, such as ibrutinib, the current standard of care. For
example, WM patients who have been treated with ibrutinib and patients with WHIM syndrome-like mutations have generally not responded as well to
treatment as compared to patients without the somatic WHIM syndrome mutation. Seminal work from Dr. Steven P. Treon M.D. Ph.D., of Harvard Medical
School, has demonstrated that patients with the double mutation (MYD88/CXCR4 WHIM) have a lower rate of Very Good Partial Response, or VGPR,
and Minor Response, or MR, as well as longer time to MR (31% vs. 7% VGPR, 94% vs. 71% for MR and 1 month to MR in the single mutant vs. 7.3
months in the double mutation). This is true in treatment naive patients with similar worse outcomes in the double mutation population shown by both Dr.
Treon and Dr. Christian Buske M.D. in previously treated patients.

In December 2019, we initiated a Phase 1b multi-center, open-label, dose-escalation, clinical trial designed to assess the safety and tolerability of
mavorixafor in combination with ibrutinib in patients with WM who have acquired a “gain of function” mutation in CXCR4 in addition to the MYD88
mutation. In addition, the trial is designed to measure changes from baseline in serum immunoglobulin M and hemoglobin, both key biomarkers of clinical
response in WM patients. The clinical trial is expected to enroll between 12-18 patients, with initial data results expected in the second half of 2020.

This trial is being conducted as part of a collaboration with The Leukemia & Lymphoma Society, or LLS, to accelerate the development of mavorixafor for
the treatment of WM. Mavorixafor was selected for LLS’s Therapy Acceleration Program®, or TAP, a strategic initiative where LLS builds business
alliances and collaborations with biotechnology companies and academic researchers to speed the development of new therapies for blood cancers.

Mavorixafor in Immuno-Oncology Indications
In solid tumors, the tumor micro-environment, or TME, consists of the tumor cells and cancer associated fibroblasts, or CAFs, each of which overproduce
growth factors and chemokines to support immune-suppression and malignant cell proliferation and growth. Evidence suggests that the pro-tumor signals
between tumor cells and CAFs occur, in part, through chemokine signaling, including through the over-production of CXCL12. The CXCL12/CXCR4
pathway has been shown to be overstimulated in more than 20 solid and blood-derived tumor types. Excessive stimulation of CXCR4 due to high
concentrations of CXCL12 influences trafficking immune cells, including myeloid-derived suppressor cells, or MDSCs, CD4+ regulatory T-cells, or Tregs,
CD8+ T-cells, and mature dendritic cells. We believe that blocking CXCR4 overstimulation can lead to improved immune cell trafficking and increase the
absolute number of CD8+ T-cells, thereby also increasing the ratio of CD8+ T-cells to Tregs in the TME.

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Our Phase 1b Clinical Trial in Combination with Nivolumab in ccRCC
We have completed a Phase 1b trial of mavorixafor for the treatment of patients with ccRCC in combination with the approved immuno-oncology therapy,
nivolumab, a PD-1 checkpoint inhibitor. The primary objective of the trial was to evaluate the safety and tolerability of mavorixafor in combination with
nivolumab. The trial enrolled patients who have not responded to nivolumab, but who were maintained on nivolumab while mavorixafor was added to their
treatment regimen. In addition to safety and tolerability, the trial evaluated early signs of biological activity using biomarkers, and clinical activity as
measured by ORR.

Enrolled patients received 400 mg of mavorixafor once daily and continued to receive standard bi-weekly nivolumab therapy. Median duration of treatment
with the combination was 3.7 months (range one to 15 months). We observed that five of nine patients had clinical improvements in tumor shrinkage with
the addition of mavorixafor.

In the trial, we observed that mavorixafor in combination with nivolumab had an acceptable tolerability profile in ccRCC patients. The most frequent drug
related adverse events were diarrhea, nasal congestion, ALT/AST increase, dry eye and fatigue. No Grade 4 or 5 adverse events occurred. All Grade 3
serious adverse events related to the combination treatment were reported to be manageable with appropriate intervention. Two patients experienced serious
adverse events deemed unrelated to treatment: one had mucosal inflammation and rash maculo-papular and another had an ALT/AST increase and
autoimmune hepatitis.

In addition, in the trial, combination therapy with mavorixafor and nivolumab exhibited anti-tumor activity in some patients with advanced ccRCC who
were previously unresponsive to nivolumab monotherapy. Four patients who had progressed on prior nivolumab monotherapy were observed to have a best
response of stable disease with the additional mavorixafor to nivolumab treatment. Of the five patients who were stable on prior nivolumab monotherapy,
one had a partial response with combination therapy of mavorixafor and nivolumab.

Our Phase 1b Clinical Biomarker Trial in Advanced Melanoma
We have completed a Phase 1b biomarker clinical trial in 16 patients with Stage III and IV melanoma. This multi-center trial evaluated the safety and
tolerability of mavorixafor alone and in combination with the immuno-oncology therapy pembrolizumab, an approved PD-1 checkpoint inhibitor. The trial
evaluated the immune profile of participants’ tumor biopsies and blood to assess changes of key immune cell profiles and inflammatory response markers.
Nine patients had both baseline (pre-dose) and post-mavorixafor treatment-evaluable biopsies and were considered as evaluable patients to be included in
the analysis. Results from the tumor biopsies taken from melanoma patients, before and after receiving single agent mavorixafor treatment for three weeks,
were analyzed. Analyses showed three weeks of single agent mavorixafor monotherapy was associated with tumor immunity. Enhanced immunity was
indicated by:

•
•
•
•

•

•

increased proliferating CD8+ cells, indicative of cytotoxic T-cell activation;
increased IFN-gamma gene expression signature score, suggesting enhanced antigen priming and activation;
increased Tumor Inflammation Signature, or TIS, indicative of increased inflammation status in the TME;
increased CD8+ T-cell density at the tumor interface, with the total density of CD8+ cells inside the tumor boundary area increased four-fold
compared with baseline;
increased numbers of cells expressing CD3 antigens, a pan T-cell marker, within tumor borders, and decreased expression of VISTA, a checkpoint
molecule that inhibits T-cell activation and proliferation; and/or
increases in multiple chemoattractant factors in serum, consistent with increased trafficking of immune cells post CXCR4 inhibition.

After single agent mavorixafor treatment, patients received mavorixafor in combination with pembrolizumab for an additional six weeks. Continued signs
of positive immune cell changes in the TME were seen with combination treatment. Treatment of additional patients in the trial showed that mavorixafor as
a single agent, and in combination with pembrolizumab, continued to be well tolerated. Mavorixafor was well tolerated as monotherapy and in combination
with pembrolizumab. Treatment-related adverse events were diarrhea, fatigue, rash macro-papular and dry eye. No Grade > 3 adverse events were observed
during the monotherapy period and there were no Grade 4 or 5 adverse events at any time during the period of the trial.

Our Phase 1/2 Clinical Trial in Combination with Axitinib in ccRCC
We have also completed an open-label, Phase 1/2 clinical trial of mavorixafor for the treatment of patients with advanced ccRCC who had received at least
one prior line of therapy across multiple sites in the United States and South Korea.

This Phase 1/2, multi-center, open-label trial of mavorixafor in combination with the approved tyrosine kinase inhibitor axitinib included 65 patients with
histologically confirmed advanced ccRCC, all of whom received at least one prior systemic therapy.

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The safety analyses included 65 patients from Phases 1/2 of the trial who were treated with 400 mg mavorixafor (200 mg twice daily or 400 mg once daily)
+ 5 mg axitinib twice daily. Treatment responses were assessed using Response Evaluation Criteria in Solid Tumor, or RECIST v1.1 (a validated set of
criteria to assess changes in tumor burden), every eight weeks from day one for 80 weeks, and then every 12 weeks thereafter, by blinded, independent
central review. Treatment-related serious adverse events were diarrhea, hyperkalemia and hypertension (n=2, or 3%) and blood creatinine increased,
dehydration, fatigue, hepatic enzyme increase, nausea, sepsis, trachea-oesophageal fistula, and vomiting (n=1 each, or 1.5%).

In the Phase 2a portion of the trial, combination therapy with mavorixafor and axitinib was generally well tolerated with a manageable safety profile and
demonstrated clinical improvement with encouraging median progression free survival, or mPFS, in a heavily pre-treated advanced ccRCC patient
population. Of the 65 patients in the trial, 49 patients (or 75%) received mavorixafor + axitinib as a third- to ninth-line therapy, having received between
two and eight prior therapies with a TKI, immuno-oncology, or IO, agent, or other systemic therapy. Fifty-seven of the 65 patients in the trial (or 88%) had
an intermediate or poor prognosis.

Overall mPFS across clinically evaluable patients receiving mavorixafor + axitinib (n=62) was 7.4 months. Predefined subpopulations examined patients
with immediate prior TKI and IO treatment. Patients treated in the subgroup with immediate prior TKI therapy (n=34) demonstrated an objective response
rate, or ORR, of 18% and an increased mPFS of 7.4 months. This is a greater than 50% improvement from the 4.8-month historical mPFS with axitinib
alone. Patients treated with mavorixafor + axitinib in the subgroup with immediate prior IO therapy (n=18) had an ORR of 61% and an increased mPFS of
11.6 months. In addition, eight of the 65 patients remain on the combination therapy as of February 2020 with durations of treatment of 26-44 months or
longer. Results suggest mavorixafor may enhance clinical response to axitinib and other TKIs that target tumor angiogenesis, as well as immunotherapy
agents.

Future development and potential commercialization of mavorixafor in ccRCC and other potential immuno-oncology indications will be pursued only as
part of a potential strategic collaboration.

Earlier-Stage Candidates and Research Efforts
X4P-003: We are developing a second-generation CXCR4 antagonist that is at the stage of candidate drug nomination designed to have an enhanced
pharmacokinetic profile relative to mavorixafor, potentially enabling improved patient compliance and ease of use to better serve patients suffering from
chronic rare diseases.

X4P-002: We are also developing X4P-002, a CXCR4 antagonist designed to cross the blood-brain barrier with a potential to provide therapeutic exposures
necessary to treat glioblastoma multiforme, or GBM. GBM is the one of the most aggressive forms of brain cancer with a five-year overall survival rate of
less than 10%. GBM accounts for about 15% of brain cancers. CXCR4 is an important mediator of malignant cell invasiveness in in vitro and in vivo
studies. We believe that X4P-002 is the only oral CXCR4 antagonist product candidate that has been shown, in preclinical studies, to penetrate the blood-
brain barrier in levels that exceed the targeted levels required for an optimized anti-cancer effect in animal studies.

Research Efforts: We are expanding our research facility in Vienna, Austria to further expand our insights into CXCR4 biology, translational science and
early stage discovery in primary immunodeficiencies.

Arsanis Programs
We have undertaken a strategic review of our development programs focused on applying monoclonal antibody, or mAb, immunotherapies to address
serious infectious diseases that were being developed by Arsanis prior to the Merger. As part of this review, we have discontinued our ASN100
Staphylococcus aureus pneumonia program. We entered into several collaborations and out-licensing arrangements, with respect to continued development
of our ASN200 for Escherichia coli and ASN300 for Klebsiella pneumonia programs, both of which have been exclusively licensed to Bravo Biosciences,
LLC, or Bravos, and our ASN500 respiratory syncytial virus, or RSV, program, which has been exclusively licensed to Evotec.

Competition
The pharmaceutical and biotechnology industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on
proprietary products. We face potential competition from many different sources, including major pharmaceutical, specialty pharmaceutical and
biotechnology companies, academic institutions, governmental agencies and public and private research institutions. Any product candidates that we
successfully develop and commercialize will compete with existing therapies and new therapies that may become available in the future.

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Many of our competitors may 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. Other firms also compete with us in recruiting and
retaining qualified scientific and management personnel and establishing clinical trial sites and patient enrollment for clinical trials, as well as in acquiring
technologies complementary to, or necessary for, our programs. Mergers and acquisitions in the pharmaceutical, biotechnology and diagnostic industries
may result in even more resources being concentrated among a smaller number of our competitors. Smaller or early-stage companies may also prove to be
significant competitors with us, particularly through collaborative arrangements with large and established companies.

Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize therapeutics that are safer, more effective, have
fewer or less severe side effects, are more convenient or are less expensive than any products that we may develop. Our competitors also may obtain
marketing approvals for their products more rapidly than we may obtain approval for our products, which could result in our competitors establishing a
strong market position before we are able to enter the market. In addition, our ability to compete may be affected because in some cases insurers or other
third-party payors, including government programs, seek to encourage the use of generic products. This may have the effect of making branded products
less attractive, from a cost perspective, to buyers.

We are aware of other companies that are developing CXCR4 inhibitors that are in a similar stage of development as mavorixafor, including Eli Lilly,
Pfizer, Bristol-Myers Squibb, or BMS, BioLineRx, Noxxon, Upsher-Smith, Polyphor and Glycomimetics. To our knowledge, there do not appear to be any
competitors with programs in development for WHIM syndrome or SCN. With respect to WM, the Dana Farber Cancer Institute has initiated a trial to
study the BMS CXCR4 antibody (IV infusion) in the treatment of WM patients with CXCR4 mutations.

In WM, there are several treatment approaches currently being developed, including targeted therapies and immunotherapies (as monotherapies and
combination therapies), chemotherapy, stem cell transplantation, and cancer vaccines. Our principal competitors in ccRCC include Pfizer, Novartis, BMS,
and Merck. To our knowledge, only X4 and BMS have therapies in development that directly target the 30-40% of WM patients with the double mutations
(MYD88 and CXCR4) and only X4 is developing an oral therapy. In glioblastoma, our principal competitors include Genentech/Roche and BMS.

Manufacturing
We do not own or operate, and currently have no plans to establish, manufacturing facilities for the production of clinical or commercial quantities of
mavorixafor or any of our other product candidates. We currently rely, and expect to continue to rely, on third parties for the manufacture of our product
candidates and any products that we may develop.

We currently have a master services agreement, or the Aptuit Agreement, in place with Aptuit (Oxford) Ltd, or Aptuit, pursuant to which Aptuit develops
and manufactures the active pharmaceutical ingredient, or API, for mavorixafor. We use this mavorixafor drug substance in our Phase 3 clinical trial for the
treatment of WHIM and in our other clinical trials. Aptuit is our sole supplier for mavorixafor drug substance and is currently manufacturing mavorixafor
drug substance at a commercially relevant scale to support our ongoing and anticipated future clinical trials.

The term of the Aptuit Agreement expires on February 19, 2021 unless terminated by us and/or Aptuit as follows: (i) by mutual agreement of the parties;
(ii) by us, if there is a material breach by the other party that remains uncured; (iii) by us, in the event of insolvency or bankruptcy of Aptuit; or (iv) by
either party, upon 30 days’ written notice.

We also have a master services agreement in place with Mayne Pharma Inc., or Mayne Pharma, which is our sole manufacturer to provide fill and finish
services for the final drug product formulation of mavorixafor for use in our clinical trials. The term of the master services agreement expires on September
10, 2023, and may be terminated by (1) us upon 30 days-notice to Mayne Pharma or (2) by either party following a material breach by the other party that
remains uncured for 30 days.

We obtain the supplies of our API and drug products from Aptuit and Mayne pursuant to typical industry standard clinical supply agreements. We believe
that both API and drug product manufacturers have the capability and capacity to manufacture currently projected clinical trial supply and commercial
volumes of mavorixafor and we are engaged in active discussions with both parties to plan anticipated commercial manufacturing arrangements. We obtain
the supplies of our product candidates from these

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manufacturers under master services contracts and specific work orders. However, we do not have long-term supply arrangements in place. We do not
currently have arrangements in place for redundant supply or a second source for API for mavorixafor. If any of our current manufacturers becomes
unavailable to us for any reason, we believe that there are a number of potential replacements, although we might incur some delay in identifying and
qualifying such replacements.

License Agreements

License Agreement with Genzyme
In July 2014, we entered into a license agreement with Genzyme, or the Genzyme Agreement, pursuant to which we were granted an exclusive license to
certain patent applications and other intellectual property owned or controlled by Genzyme related to the CXCR4 receptor to develop and commercialize
products containing licensed compounds (including but not limited to mavorixafor) for all therapeutic, prophylactic and diagnostic uses with the exception
of autologous and allogenic human stem cell therapy. Genzyme has retained the exclusive right to use the intellectual property licensed to us in specific
indications related to Genzyme’s product Mozobil® and allogenic/autologous hematopoietic stem cell transplantation treatments. Genzyme has also retained
the non-exclusive right to conduct preclinical research involving compounds in any field, including any fields licensed to us, but has not retained rights to
conduct any clinical development or commercialization of those compounds identified in the agreement in any of the fields licensed to us. We are primarily
responsible for the preparation, filing, prosecution and maintenance of all patent applications and patents covering the intellectual property licensed to us
under the agreement at our sole expense.

Under the terms of the Genzyme Agreement, we are obligated to use commercially reasonable efforts to develop and commercialize licensed products for
use in the field in the United States and at least one other major market country. We have the right to grant sublicenses of the licensed rights that cover
mavorixafor to third parties. If we wish to grant a sublicense to any licensed product other than mavorixafor, we are obligated to first offer the sublicense to
Genzyme. If Genzyme expresses written interest for the sublicense, then we will negotiate exclusively with Genzyme for a certain stated period to obtain a
license to such rights, after which Genzyme shall have no further rights with respect to such licensed product and we will be free to negotiate a sublicense
with respect to such licensed product with any third party.

In accordance with the Genzyme Agreement, X4 issued Genzyme 107,364 shares of common stock following its Series A financing. No further issuance of
shares is required under the terms of the license.

We are obligated to pay Genzyme milestone payments in the aggregate amount of up to $25,000,000, contingent upon our achievement of certain late-stage
regulatory and sales milestones with respect to licensed products. In addition,X4 was required to make a one-time milestone payment to Genzyme upon the
consummation by X4 of a change of control transaction in an amount equal to 5.5% of the consideration paid to its equity holders, other than Genzyme, in
connection with such change of control transaction, after deducting its outstanding debt obligations and the aggregate cash investments made by our equity
holders prior to the closing of the change of control transaction. The Merger qualified as a change of control event, as defined in the license agreement, but
resulted in no payment being due to Genzyme under the license agreement.

We are obligated under the Genzyme agreement to pay Genzyme tiered royalties based on net sales of licensed products that we commercialize under the
Genzyme agreement. Our obligation to pay royalties for each licensed product expires on a country-by-country basis on the latest of (i) the expiration of
licensed patent rights that cover that licensed product in that country, (ii) the expiration of regulatory exclusivity in that country and (iii) ten years after the
first commercial sale of such licensed product in that country. Royalty rates are subject to reduction under the agreement in specified circumstances,
including in any country if we are required to obtain a license from any third party to the extent our patent rights might infringe the third party’s patent
rights, if a licensed product is not covered by a valid claim in that country or if sales of generic products reach certain thresholds in that country. If we enter
into a sublicense under the Genzyme agreement, we will be obligated to pay Genzyme a percentage of certain upfront, maintenance fees, milestone
payments and royalty payments paid to us by the sublicensee.

The term of the Genzyme Agreement will continue until the later of the expiration of the last to expire valid claim of the patents licensed under the
agreement that cover any licensed product, the expiration of regulatory exclusivity applicable to any licensed product and 10 years from the date of first
commercial sale of any licensed product. Either we or Genzyme may terminate the Genzyme Agreement in the event of the bankruptcy or uncured material
breach by the other party. Genzyme may terminate the Genzyme Agreement if we or our affiliates initiate a patent challenge of the patents licensed under
the agreement. We may terminate the Genzyme Agreement immediately upon notice to Genzyme if we reasonably believe that the development or

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commercialization of a licensed compound or product under the Genzyme agreement would result in a material safety issue for patients.

License Agreement with Georgetown University
In December 2016, we entered into a license agreement with the Georgetown University, or Georgetown, pursuant to which we obtained an exclusive,
worldwide license to practice certain methods, and to make, have made, use, sell, offer for sale and import products, covered by licensed patent rights co-
owned by Georgetown. The rights licensed to us are for all therapeutic, prophylactic and diagnostic uses in all disease indications in humans and animals.
We have the right to grant sublicenses of the licensed rights to third parties to the extent consistent with the terms of the Georgetown agreement.

Under the terms of the Georgetown agreement we paid a one-time only, upfront fee of $50,000, and we may be required to pay milestone payments of up to
an aggregate of $800,000 related to commercial sales of a licensed product. We are responsible for all patent prosecution costs incurred with respect to the
licensed patents. We are obligated under the agreement to use commercially reasonable efforts to develop and commercialize licensed product, to make
licensed product reasonably available to the public, to obtain government approvals for licensed product and to market licensed product in quantities
sufficient to meet the market demand.

The term of the Georgetown agreement will continue until the expiration of the last valid claim within the patent rights covering the licensed products.
Georgetown may terminate the Georgetown agreement or convert our license to non-exclusive in the event (i) we fail to pay any amount and fail to cure
such failure within 30 days after receipt of notice, (ii) we default in our obligation to obtain and maintain insurance and fail to remedy such breach within
45 days after receipt of notice, (iii) we declare insolvency or bankruptcy or (iv) we materially default in the performance of any material obligations under
the Georgetown agreement which is not cured within a certain period from the date of written notice of such default. We may terminate the Georgetown
agreement at any time upon at least 60 days’ written notice.

License Agreement with Beth Israel Deaconess Medical Center
In December 2016, we entered into a license agreement with Beth Israel Deaconess Medical Center, or BIDMC, pursuant to which we obtained an
exclusive, worldwide license to make, have made, use, sell, offer for sale and import of licensed products and certain processes covered by licensed patent
rights co-owned by BIDMC and a nonexclusive royalty-free right to use certain information pertaining to any invention claimed in the licensed patents that
is owned by BIDMC to develop, make, have made, use, have used, sell, have sold and commercialize such licensed products and processes. The rights
licensed to us are for all fields of use. We have the right to grant sublicenses of the licensed rights to third parties to the extent consistent with the terms of
the agreement.

Under the terms of the BIDMC agreement we paid a one-time only, upfront fee of $20,000 and we are responsible for all future patent prosecution costs.

The term of the BIDMC agreement will continue until the expiration of the last valid claim within the patent rights covering the licensed product. BIDMC
may terminate the agreement in the event (i) we fail to pay any amount and fail to cure such failure within 15 days after receipt of notice, (ii) the insurance
coverage that we are obligated to maintain under the agreement is terminated and we fail to obtain replacement insurance within a certain period of time
following notice to BIDMC, or (iii) we declare insolvency or bankruptcy. In addition, if we are in material breach of any material provisions of the BIDMC
agreement and fail to remedy such breach within 60 days after receipt of notice, BIDMC may terminate the BIDMC agreement or terminate any licenses
granted under the agreement with respect to the country or countries in which such material breach has occurred. We may terminate the agreement at any
time upon at least 90 days’ written notice.

Abbisko Agreement
In July 2019, we entered into a license agreement with Abbisko Therapeutics Co., Ltd., or Abbisko. Under the terms of the agreement, we granted Abbisko
the exclusive right to develop, manufacture and commercialize mavorixafor in mainland China, Taiwan, Hong Kong and Macau. The agreement provides
Abbisko with the exclusive rights in this territory to develop and commercialize mavorixafor in combination with checkpoint inhibitors or other agents in
oncology indications. Pancreatic cancer, ovarian cancer and triple negative breast cancer will be explored initially. We retain the full rest-of-world rights to
develop and commercialize mavorixafor outside of Greater China for all indications and the ability to utilize data generated pursuant to the Abbisko
collaboration for rest-of-world development. In addition, Abbisko has the right of first refusal if we determine to pursue additional products in the Abbisko
Territory, as defined in the agreement. We have agreed to enter into separate agreements

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whereby we would provide Abbisko with a clinical supply and, if the product is commercialized in the territory licensed by Abbisko, a commercial supply
of the licensed compound.

Pursuant to the agreement with Abbisko, upon the closing of a qualified financing, as defined in the agreement, Abbisko will make a one-time, non-
refundable, non-creditable financial milestone payment in the low single-digit millions to us. We are also eligible to receive potential development and
regulatory milestone payments and potential commercial milestone payments based on annual net sales of licensed products. Upon commercialization of
mavorixafor in the Abbisko Territory, we are eligible to receive a tiered royalty, with a percentage range in the low double-digits, on net sales of approved
licensed products. Abbisko is obligated to use commercially reasonable efforts to develop and commercialize mavorixafor in the Abbisko Territory.
Abbisko has responsibility for all activities and costs associated with the further development, manufacture and commercialization of mavorixafor in the
Abbisko Territory.

Intellectual Property
Our ability to commercialize our product candidates depends in large part on our ability to obtain and maintain intellectual property protection for our
product candidates, including mavorixafor, and our preclinical compounds and core technologies. Our policy is to seek to protect our intellectual property
position by, among other methods, filing U.S. and foreign patent applications related to the technology, inventions and improvements that are important to
the development and implementation of our business strategy. We also rely on trade secrets, know-how and continuing technological innovation to develop
and maintain our proprietary position.

We file patent applications directed to our product candidates, preclinical compounds and related technologies to establish intellectual property positions on
these compounds and their uses in disease. As of December 31, 2019, we owned or exclusively licensed 13 issued U.S. patents, 12 pending U.S. non-
provisional patent applications, one pending U.S. provisional patent application, and approximately 132 PCT and foreign patents and patent applications in
the following foreign jurisdictions: Belgium, Brazil, Canada, China, European Patent Office, France, Germany, Great Britain, Hong Kong, India, Ireland,
Italy, Israel, Japan, Lichtenstein, Mexico, Netherlands, Spain, Sweden and Switzerland.

As of December 31, 2019, our in-licensed intellectual property portfolio for mavorixafor included two issued U.S. patents and one pending U.S. patent
application directed to compositions of matter for mavorixafor, which is expected to expire in December 2022 excluding possible patent term extensions of
up to an additional five years. The intellectual property portfolio for mavorixafor also included one issued U.S. patent with claims directed to a crystalline
salt form of mavorixafor, one issued U.S. patent directed to pharmaceutical compositions of mavorixafor in unit dosage form, and four issued U.S. patents
directed to methods of making mavorixafor and key intermediates. We also had four issued U.S. patents directed to compositions and methods of making
chemical compounds related to the X4P-001 program. Approximately 85 corresponding PCT and foreign patents and patent applications directed to
compositions of matter and related chemical compounds as well as methods of making and methods of use were issued or pending. All of the above patents
and patent applications were exclusively licensed to us pursuant to the terms of the Genzyme license agreement.

Additionally, we have filed our own patent applications with respect to the mavorixafor and X4P-002 product candidates. Some of these patent applications
are co-owned with Genzyme, BIDMC or Georgetown, with their rights exclusively licensed to X4. As of December 31, 2019, our independently generated
intellectual property portfolio included eight pending U.S. non-provisional patent applications, one pending U.S. provisional patent application, and
approximately 31 pending PCT and foreign patent applications related to our mavorixafor clinical programs in cancer and primary immunodeficiencies;
and three pending U.S. non-provisional patent applications, one pending U.S. provisional patent application and 16 pending PCT and foreign patent
applications related to our preclinical compounds and X4P-002 in glioblastoma. Patents issuing from these applications, if any, are expected to expire
between 2036 and 2039.

The term of individual patents depends upon the legal term of the 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 U.S. Patent and Trademark Office, or 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 U.S. patent that covers a
drug or biological product may also be eligible for patent term extension when approval from the FDA is granted, provided statutory and regulatory
requirements are met. In the future, if our product candidates receive approval from the FDA or foreign regulatory authorities, we expect to apply for patent
term extensions on issued patents covering those products, depending upon the length of the clinical

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trials for each drug and other factors. There can be no assurance that any of our pending patent applications will issue or that we will benefit from any
patent term extension or other favorable adjustment to the term of any of our patents.

As with other biotechnology and pharmaceutical companies, our ability to maintain and solidify our proprietary and intellectual property position for our
product candidates, including mavorixafor, and our preclinical compounds, and our core technologies will depend on our success in obtaining effective
patent claims and enforcing those claims if granted. However, patent applications that we may file or license from third parties may not result in the
issuance of patents. We also cannot predict the breadth of claims that may be allowed or enforced in our patents. Any issued patents that we may receive in
the future may be challenged, invalidated or circumvented. For example, prior to March 16, 2013, in the United States, patent applications were subject to a
“first to invent” rule of law. Applications filed after March 16, 2013 (except for certain applications claiming the benefit of earlier-filed applications) are
subject to a “first to file” rule of law.

Discoveries reported in the scientific literature often lag 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. We cannot be certain that any existing or future application will be subject to
the “first to file” or “first to invent” rule of law, that we were the first to make the inventions claimed in our existing patents or pending patent applications
subject to the prior laws, or that we were the first to file for patent protection of such inventions subject to the new laws. If third parties prepare and file
patent applications in the United States that also claim technology we have claimed in our patents or patent applications, we may have to participate in
interference proceedings in the USPTO to determine priority of invention, which could result in substantial costs to us, even if the eventual outcome is
favorable to us. In addition, because of the extensive time required for clinical development and regulatory review of a product candidate we may develop,
it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period
following commercialization, thereby reducing any advantage of any such patent.

In addition to patents, we rely upon unpatented trade secrets, know-how, and continuing technological innovation to develop and maintain our competitive
position. We seek to protect our proprietary information, in part, by using confidentiality agreements with our collaborators, scientific advisors, employees
and consultants, and invention assignment agreements with our employees. We also have agreements requiring assignment of inventions with selected
consultants, scientific advisors and collaborators. The confidentiality agreements are designed to protect our proprietary information and, in the case of
agreements or clauses requiring invention assignment, to grant us ownership of technologies that are developed under those agreements.

Government Regulation and Product Approval

The FDA Approval Process
In the United States, pharmaceutical products are subject to extensive regulation by the FDA. The Federal Food, Drug, and Cosmetic Act, or the FDCA,
and other federal and state statutes and regulations, govern, among other things, the research, development, testing, manufacture, storage, recordkeeping,
approval, labeling, promotion and marketing, distribution, post-approval monitoring and reporting, sampling, and import and export of pharmaceutical
products. Failure to comply with applicable U.S. requirements may subject a company to a variety of administrative or judicial sanctions, such as
imposition of clinical holds, refusal by the FDA to approve pending NDAs, warning letters, product recalls, product seizures, total or partial suspension of
production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement, civil penalties and criminal prosecution.

Pharmaceutical product development in the United States typically involves preclinical or other nonclinical laboratory and animal tests and the submission
to the FDA of an IND, which must become effective before clinical testing may commence. For commercial approval, the sponsor must submit adequate
tests by all methods reasonably applicable to show that the drug is safe for use under the conditions prescribed, recommended or suggested in the proposed
labeling. The sponsor must also submit substantial evidence, generally consisting of adequate, well-controlled clinical trials to establish that the drug will
have the effect it purports or is represented to have under the conditions of use prescribed, recommended or suggested in the proposed labeling. In certain
cases, the FDA may determine that a drug is effective based on one clinical study plus confirmatory evidence. Satisfaction of the FDA pre-market approval
requirements typically takes many years and the actual time required may vary substantially based upon the type, complexity and novelty of the product or
disease.

Nonclinical tests include laboratory evaluation of product chemistry, formulation and toxicity, as well as animal studies to assess the characteristics and
potential safety and efficacy of the product. The conduct of the nonclinical tests must comply with federal requirements, including the FDA’s good
laboratory practices regulations and the U.S. Department of Agriculture’s, or USDA’s,

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regulations implementing the Animal Welfare Act. The results of nonclinical testing are submitted to the FDA as part of an IND along with other
information, including information about product chemistry, manufacturing and controls, and a proposed clinical trial protocol. Long-term nonclinical tests,
such as animal studies of reproductive toxicity and carcinogenicity, may continue after the IND is submitted.

A 30-day waiting period after the submission of each IND is required prior to the commencement of clinical testing in humans. If the FDA has not imposed
a clinical hold on the IND or otherwise commented or questioned the IND within this 30-day period, the clinical trial proposed in the IND may begin.

Clinical trials involve the administration of the investigational new drug to healthy volunteers or patients under the supervision of a qualified investigator.
Clinical trials must be conducted: (i) in compliance with federal regulations, (ii) in compliance with GCP, an international standard meant to protect the
rights and health of patients and to define the roles of clinical trial sponsors, administrators and monitors, and (iii) under protocols detailing the objectives
of the trial, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. Each protocol involving testing on U.S. patients
and subsequent protocol amendments must be submitted to the FDA as part of the IND.

The FDA may order the temporary, or permanent, discontinuation of a clinical trial at any time or impose other sanctions if it believes that the clinical trial
either is not being conducted in accordance with the FDA requirements or presents an unacceptable risk to the clinical trial patients. The trial protocol and
informed consent information for patients in clinical trials must also be submitted to an institutional review board, or IRB, at each site where a trial will be
conducted for approval. An IRB may also require the clinical trial at the site to be halted, either temporarily or permanently, for failure to comply with the
IRB’s requirements or may impose other conditions.

Clinical trials to support NDAs for marketing approval are typically conducted in three sequential phases, but the phases may overlap. In general, in Phase
1, the initial introduction of the drug into healthy human volunteers or, in some cases, patients, the drug is tested to assess metabolism, pharmacokinetics,
pharmacological actions, side effects associated with increasing doses and, if possible, early evidence of effectiveness. Phase 2 usually involves trials in a
limited patient population to determine the effectiveness of the drug for a particular indication, dosage tolerance and optimum dosage, and to identify
common adverse effects and safety risks. If a compound demonstrates evidence of effectiveness and an acceptable safety profile in Phase 2 evaluations,
Phase 3 trials are undertaken to obtain the additional information about clinical efficacy and safety in a larger number of patients, typically at
geographically dispersed clinical trial sites, to permit the FDA to evaluate the overall benefit-risk relationship of the drug and to provide adequate
information for the labeling of the drug. In most cases, the FDA requires two adequate and well-controlled Phase 3 clinical trials to demonstrate the
efficacy of the drug. The FDA may, however, determine that a drug is effective based on one clinical trial plus confirmatory evidence. Only a small
percentage of investigational drugs complete all three phases and obtain marketing approval. In some cases, the FDA may require post-market studies,
known as Phase 4 studies, to be conducted as a condition of approval to gather additional information on the drug’s effect in various populations and any
side effects associated with long-term use. Depending on the risks posed by the drugs, other post-market requirements may be imposed.

After completion of the required clinical testing, an NDA is prepared and submitted to the FDA. FDA approval of the NDA is required before marketing of
the product may begin in the United States. The NDA must include the results of all preclinical, clinical, and other testing and a compilation of data relating
to the product’s pharmacology, chemistry, manufacture, and controls. The cost of preparing and submitting an NDA is substantial. Under federal law, the
submission of most NDAs is additionally subject to a substantial application user fee, subject to certain exceptions and waivers, such as for orphan-
designated drugs.

The FDA has 60 days from its receipt of an NDA to determine whether the application will be accepted for filing based on the agency’s threshold
determination that it is sufficiently complete to permit substantive review. Once the submission is accepted for filing, the FDA begins an in-depth review.
Under the statute and implementing regulations, the FDA has 180 days (the initial review cycle) from the date of filing to issue either an approval letter or a
complete response letter, unless the review period is adjusted by mutual agreement between the FDA and the applicant or as a result of the applicant
submitting a major amendment. In practice, the performance goals established pursuant to the Prescription Drug User Fee Act have effectively extended the
initial review cycle beyond 180 days. The FDA’s current performance goals call for the FDA to complete review of 90% of standard (non-priority) NDAs
within 10 months of receipt and within six months for priority NDAs, but two additional months are added to standard and priority NDAs for a new
molecular entity, or NME.

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The FDA may also refer applications for novel drug products, or drug products that present difficult questions of safety or efficacy, to an advisory
committee, which is typically a panel that includes clinicians and other experts, for review, evaluation and a recommendation as to whether the application
should be approved. The FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. Before
approving an NDA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP. Additionally, the FDA will inspect the facility
or the facilities at which the drug is manufactured. The FDA will not approve the product unless compliance with current GMP is satisfactory and the NDA
contains data that provide substantial evidence that the drug is safe and effective in the indication studied.

After the FDA evaluates the NDA and the manufacturing facilities, it issues either an approval letter or a complete response letter. A complete response
letter generally outlines the deficiencies in the submission and may require substantial additional testing, or information, in order for the FDA to reconsider
the application. If, or when, those deficiencies have been addressed to the FDA’s satisfaction in a resubmission of the NDA, the FDA will issue an approval
letter. The FDA has committed to reviewing 90% of resubmissions within two to six months depending on the type of information included.

An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications. As a condition of NDA
approval, the FDA may require a risk evaluation and mitigation strategy, or REMS, to help ensure that the benefits of the drug outweigh the potential risks.
REMS can include medication guides, communication plans for health care professionals, and elements to assure safe use, or ETASU. ETASU can include,
but are not limited to, special training or certification for prescribing or dispensing, dispensing only under certain circumstances, special monitoring, and
the use of patient registries. The requirement for a REMS can materially affect the potential market and profitability of the drug. Moreover, product
approval may require substantial post-approval testing and surveillance to monitor the drug’s safety or efficacy. Once granted, product approvals may be
withdrawn if compliance with regulatory standards is not maintained or problems are identified following initial marketing.

Disclosure of Clinical Trial Information
Sponsors of clinical trials of certain FDA-regulated products, including prescription drugs, are required to register and disclose certain clinical trial
information on a public website maintained by the U.S. National Institutes of Health. Information related to the product, patient population, phase of
investigation, study sites and investigator, and other aspects of the clinical trial is made public as part of the registration. Sponsors are also obligated to
disclose the results of these trials after completion. Disclosure of the results of these trials can be delayed for up to two years if the sponsor certifies that it
is seeking approval of an unapproved product or that it will file an application for approval of a new indication for an approved product within one year.
Competitors may use this publicly available information to gain knowledge regarding the design and progress of the development programs.

The Hatch-Waxman Act

Orange Book Listing
In seeking approval for a drug through an NDA, applicants are required to list with the FDA each patent whose claims cover the applicant’s product. Upon
approval of a drug, each of the patents listed in the application for the drug is then published in the FDA’s Approved Drug Products with Therapeutic
Equivalence Evaluations, commonly known as the Orange Book. Drugs listed in the Orange Book can, in turn, be cited by potential generic competitors in
support of approval of an abbreviated new drug application, or ANDA. An ANDA provides for marketing of a drug product that has the same active
ingredients in the same strengths and dosage form as the listed drug and has been shown through bioequivalence testing to be bioequivalent to the listed
drug. Other than the requirement for bioequivalence testing, ANDA applicants are not required to conduct, or submit results of, pre-clinical or clinical tests
to prove the safety or effectiveness of their drug product. Drugs approved in this way are considered to be therapeutically equivalent to the listed drug, are
commonly referred to as “generic equivalents” to the listed drug, and can often be substituted by pharmacists under prescriptions written for the original
listed drug in accordance with state law.

The ANDA applicant is required to certify to the FDA concerning any patents listed for the approved 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.
The ANDA applicant may also elect to submit a section viii statement, certifying that its proposed ANDA labeling does not contain (or carves out) any
language regarding the patented method-of-use, rather than certify to a listed method-of-use patent.

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If the applicant does not challenge the listed patents, the ANDA application will not be approved 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 ANDA 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 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 applicant.

The ANDA application also will not be approved until any applicable non-patent exclusivity listed in the Orange Book for the referenced product has
expired.

Exclusivity
Upon NDA approval of a new chemical entity, or NCE, which is a drug that contains no active moiety that has been approved by the FDA in any other
NDA, that drug receives five years of marketing exclusivity during which time the FDA cannot receive any ANDA or 505(b)(2) application seeking
approval of a drug that references a version of the NCE drug. Certain changes to a drug, such as the addition of a new indication to the package insert, are
associated with a three-year period of exclusivity during which the FDA cannot approve an ANDA or 505(b)(2) application that includes the change.

An ANDA or 505(b)(2) application may be submitted one year before NCE exclusivity expires if a Paragraph IV certification is filed. If there is no listed
patent in the Orange Book, there may not be a Paragraph IV certification and thus no ANDA or 505(b)(2) application may be filed before the expiration of
the exclusivity period.

For a botanical drug, the FDA may determine that the active moiety is one or more of the principal components or the complex mixture as a whole. This
determination would affect the utility of any five-year exclusivity as well as the ability of any potential generic competitor to demonstrate that it is the same
drug as the original botanical drug.

Five-year and three-year exclusivities do not preclude FDA approval of a 505(b)(1) application for a duplicate version of the drug during the period of
exclusivity, provided that the 505(b)(1) applicant conducts or obtains a right of reference to all of the preclinical studies and adequate and well controlled
clinical trials necessary to demonstrate safety and effectiveness.

Patent Term Extension
After NDA approval, owners of relevant drug patents may apply for up to a five-year patent extension. The allowable patent term extension is calculated as
half of the drug’s testing phase—the time between IND submission and NDA submission—and all of the review phase—the time between NDA
submission and approval up to a maximum of five years. The time can be shortened if the FDA determines that the applicant did not pursue approval with
due diligence. The total patent term after the extension may not exceed 14 years.

For patents that might expire during the application phase, the patent owner may request an interim patent extension. An interim patent extension increases
the patent term by one year and may be renewed up to four times. For each interim patent extension granted, the post-approval patent extension is reduced
by one year. The director of the USPTO must determine that approval of the drug covered by the patent for which a patent extension is being sought is
likely. Interim patent extensions are not available for a drug for which an NDA has not been submitted.

Advertising and Promotion
Once an NDA is approved, a product will be subject to certain post-approval requirements. For instance, the FDA closely regulates the post-approval
marketing and promotion of drugs.

Drugs may be marketed only for the approved indications and in accordance with the provisions of the approved labeling. Changes to some of the
conditions established in an approved application, including changes in indications, labeling, or manufacturing processes or facilities, require submission
and FDA approval of a new NDA or NDA supplement before the change can be implemented. An NDA supplement for a new indication typically requires
clinical data similar to that in the

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original application, and the FDA uses the same procedures and actions in reviewing NDA supplements as it does in reviewing NDAs.

Adverse Event Reporting and GMP Compliance
Adverse event reporting and submission of periodic reports is required following FDA approval of an NDA. The FDA also may require post-marketing
testing, known as Phase 4 testing, require a REMS special communications regarding the safety of the drug or heightened surveillance to monitor the
effects of an approved product, or may place conditions on an approval that could restrict the distribution or use of the product. In addition, quality control,
drug manufacture, packaging, and labeling procedures must continue to conform to GMP after approval. Drug manufacturers and certain of their
subcontractors are required to register their establishments with the FDA and certain state agencies. Registration with the FDA subjects entities to periodic
unannounced inspections by the FDA, during which the agency inspects manufacturing facilities to assess compliance with GMP. Accordingly,
manufacturers must continue to expend time, money and effort in the areas of production and quality control to maintain compliance with GMP. Regulatory
authorities may withdraw product approvals or request product recalls if a company fails to comply with regulatory standards, if it encounters problems
following initial marketing or if previously unrecognized problems are subsequently discovered.

Pediatric Exclusivity and Pediatric Use
The Best Pharmaceuticals for Children Act, or BPCA, provides NDA holders a six-month period of exclusivity attached to any other exclusivity listed with
FDA—patent or non-patent—for a drug if certain conditions are met. Conditions for pediatric exclusivity include a determination by the FDA that
information relating to the use of a new drug in the pediatric population may produce health benefits in that population; a written request by the FDA for
pediatric studies; and agreement by the applicant to perform the requested studies and the submission to the FDA, completion of the studies in accordance
with the written request, and the acceptance by the FDA of the reports of the requested studies within the statutory timeframe. Applications under the
BPCA are treated as priority applications.

In addition, under the Pediatric Research Equity Act, or PREA, NDAs or supplements to NDAs must contain data 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 drug is safe and effective, unless the sponsor has received a deferral or waiver from the FDA. Unless otherwise required by regulation, PREA
does not apply to any drug for an indication for which orphan designation has been granted. The sponsor or the FDA may request a deferral of pediatric
studies for some or all of the pediatric subpopulations. A deferral may be granted for several reasons, including a finding that the drug is ready for approval
for use in adults before pediatric studies are complete or that additional safety or effectiveness data need to be collected before the pediatric studies begin.
Under PREA, the FDA must send a non-compliance letter requesting a response within 45 days to any sponsor that fails to submit the required assessment,
fails to keep a deferral current or fails to submit a request for approval of a pediatric formulation.

Orphan Drugs
Under the Orphan Drug Act, the FDA may grant orphan drug designation to drugs intended to treat a rare disease or condition—generally a disease or
condition that affects fewer than 200,000 individuals in the United States (or affects more than 200,000 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 such disease or condition will be recovered from
sales of such drug in the United States). Orphan drug designation must be requested before submitting an NDA. After the FDA grants orphan drug
designation, the generic identity of the drug and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any
advantage in, or shorten the duration of, the regulatory review and approval process. The first NDA applicant to receive FDA approval for a particular
active ingredient to treat a particular disease with FDA orphan drug designation is entitled to a seven-year exclusive marketing period in the United States
for that product, for that indication. During the seven-year exclusivity period, the FDA may not approve any other applications to market the same drug for
the same disease, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity. If the FDA
designates an orphan drug based on a finding of clinical superiority, the FDA must provide a written notification to the sponsor that states the basis for
orphan designation, including “any plausible hypothesis” relied upon by the FDA. The FDA must also publish a summary of its clinical superiority
findings upon granting orphan drug exclusivity based on clinical superiority.

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Orphan drug exclusivity does not prevent the FDA from approving a different drug for the same disease or condition, or the same drug for a different
disease or condition. Among the other benefits of orphan drug designation are tax credits for certain research and a waiver of the NDA application user fee.

Breakthrough Designation
A product can be designated as a breakthrough therapy by FDA if it is intended to treat a serious or life-threatening condition and preliminary clinical
evidence indicates that it may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints. A sponsor may
request that a product candidate be designated as a breakthrough therapy concurrently with the submission of an IND or any time before an end-of-Phase-2
meeting, and the FDA must determine if the product candidate qualifies for breakthrough therapy designation within 60 days of receipt of the sponsor’s
request. If so designated, the FDA shall act to expedite the development and review of the product’s marketing application, including by meeting with the
sponsor throughout the product’s development, providing timely advice to the sponsor to ensure that the development program to gather pre-clinical and
clinical data is as efficient as practicable, involving senior managers and experienced review staff in a cross-disciplinary review, assigning a cross-
disciplinary project lead for the FDA review team to facilitate an efficient review of the development program and to serve as a scientific liaison between
the review team and the sponsor, and taking steps to ensure that the design of the clinical trials is as efficient as practicable.

Europe/Rest of World Government Regulation
In addition to regulations in the United States, we are and will be subject, either directly or through our distribution partners, to a variety of regulations in
other jurisdictions governing, among other things, clinical trials and any commercial sales and distribution of our products, if approved.

Whether or not we obtain FDA approval for a product, we must obtain the requisite approvals from regulatory authorities in non-U.S. countries prior to the
commencement of clinical trials or marketing of the product in those countries.

In the European Union, medicinal products are subject to extensive pre- and post-marketing regulation by regulatory authorities at both the European Union
and national levels. Additional rules also apply at the national level to the manufacture, import, export, storage, distribution and sale of controlled
substances. In many E.U. member states, the regulatory authority responsible for medicinal products is also responsible for controlled substances.
Responsibility is, however, split in some member states. Generally, any company manufacturing or distributing a medicinal product containing a controlled
substance in the European Union will need to hold a controlled substances license from the competent national authority and will be subject to specific
record-keeping and security obligations. Separate import or export certificates are required for each shipment into or out of the member state.

Clinical Trials and Marketing Approval
Certain countries outside of the United States have a process that requires the submission of a clinical trial application much like an IND prior to the
commencement of human clinical trials. In Europe, for example, a clinical trial application, or CTA, must be submitted to the competent national health
authority and to independent ethics committees in each country in which a company intends to conduct clinical trials. Once the CTA is approved in
accordance with a country’s requirements and a company has received favorable ethics committee approval, clinical trial development may proceed in that
country.

The requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country, even
though there is already some degree of legal harmonization in the European Union member states resulting from the national implementation of underlying
E.U. legislation. In all cases, the clinical trials must be conducted in accordance with the International Conference on Harmonization, or ICH, guidelines on
GCP and other applicable regulatory requirements.

To obtain regulatory approval to place a drug on the market in the European Union, we must submit a marketing authorization application. This application
is similar to the NDA in the United States, with the exception of, among other things, country-specific document requirements. All application procedures
require an application in the common technical document, or CTD, format, which includes the submission of detailed information about the manufacturing
and quality of the product, and non-clinical and clinical trial information. Drugs can be authorized in the European Union by using (i) the centralized
authorization procedure, (ii) the mutual recognition procedure, (iii) the decentralized procedure or (iv) national authorization procedures.

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The European Commission created the centralized procedure for the approval of human drugs to facilitate marketing authorizations that are valid
throughout the European Union and, by extension (after national implementing decisions) in Iceland, Liechtenstein and Norway, which, together with the
E.U. member states, comprise the European Economic Area, or EEA. Applicants file marketing authorization applications with the EMA, where they are
reviewed by a relevant scientific committee, in most cases the Committee for Medicinal Products for Human Use, or CHMP. The EMA forwards CHMP
opinions to the European Commission, which uses them as the basis for deciding whether to grant a marketing authorization. This procedure results in a
single marketing authorization granted by the European Commission that is valid across the European Union, as well as in Iceland, Liechtenstein and
Norway. The centralized procedure is compulsory for human drugs that are: (i) derived from biotechnology processes, such as genetic engineering,
(ii) contain a new active substance indicated for the treatment of certain diseases, such as HIV/AIDS, cancer, diabetes, neurodegenerative diseases,
autoimmune and other immune dysfunctions and viral diseases, (iii) officially designated “orphan drugs” (drugs used for rare human diseases) and
(iv) advanced-therapy medicines, such as gene-therapy, somatic cell-therapy or tissue-engineered medicines. The centralized procedure may at the
voluntary request of the applicant also be used for human drugs which do not fall within the above-mentioned categories if the CHMP agrees that (a) the
human drug contains a new active substance not yet approved on November 20, 2005; (b) it constitutes a significant therapeutic, scientific or technical
innovation or (c) authorization under the centralized procedure is in the interests of patients at the E.U. level.

Under the centralized procedure in the European Union, the maximum timeframe for the evaluation of a marketing authorization application by the EMA is
210 days (excluding clock stops, when additional written or oral information is to be provided by the applicant in response to questions asked by the
CHMP), with adoption of the actual marketing authorization by the European Commission thereafter. Accelerated evaluation might be granted by the
CHMP in exceptional cases, when a medicinal product is expected to be of a major public health interest from the point of view of therapeutic innovation,
defined by three cumulative criteria: the seriousness of the disease to be treated, the absence of an appropriate alternative therapeutic approach, and
anticipation of exceptional high therapeutic benefit. In this circumstance, the EMA ensures that the evaluation for the opinion of the CHMP is completed
within 150 days and the opinion issued thereafter.

For those medicinal products for which the centralized procedure is not available, the applicant must submit marketing authorization applications to the
national medicines regulators through one of three procedures: (i) the mutual recognition procedure (which must be used if the product has already been
authorized in at least one other E.U. member state, and in which the E.U. member states are required to grant an authorization recognizing the existing
authorization in the other E.U. member state, unless they identify a serious risk to public health), (ii) the decentralized procedure (in which applications are
submitted simultaneously in two or more E.U. member states) or (iii) national authorization procedures (which results in a marketing authorization in a
single E.U. member state).

Mutual Recognition Procedure
The mutual recognition procedure, or MRP, for the approval of human drugs is an alternative approach to facilitate individual national marketing
authorizations within the European Union. Basically, the MRP may be applied for all human drugs for which the centralized procedure is not obligatory.
The MRP is applicable to the majority of conventional medicinal products and must be used if the product has already been authorized in one or more
member states.

The characteristic of the MRP is that the procedure builds on an already–existing marketing authorization in a member state of the European Union that is
used as a reference in order to obtain marketing authorizations in other E.U. member states. In the MRP, a marketing authorization for a drug already exists
in one or more member states of the European Union and subsequently marketing authorization applications are made in other E.U. member states by
referring to the initial marketing authorization. The member state in which the marketing authorization was first granted will then act as the reference
member state. The member states where the marketing authorization is subsequently applied for act as concerned member states. The concerned member
states are required to grant an authorization recognizing the existing authorization in the reference member state, unless they identify a serious risk to public
health.

The MRP is based on the principle of the mutual recognition by E.U. member states of their respective national marketing authorizations. Based on a
marketing authorization in the reference member state, the applicant may apply for marketing authorizations in other member states. In such case, the
reference member state shall update its existing assessment report about the drug in 90 days. After the assessment is completed, copies of the report are sent
to all member states, together with the approved summary of product characteristics, labeling and package leaflet. The concerned member states then have
90 days to

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recognize the decision of the reference member state and the summary of product characteristics, labeling and package leaflet. National marketing
authorizations shall be granted within 30 days after acknowledgement of the agreement.

If any E.U. member state refuses to recognize the marketing authorization by the reference member state, on the grounds of potential serious risk to public
health, the issue will be referred to a coordination group. Within a timeframe of 60 days, member states shall, within the coordination group, make all
efforts to reach a consensus. If this fails, the procedure is submitted to an EMA scientific committee for arbitration. The opinion of this EMA Committee is
then forwarded to the European Commission for the start of the decision making process. As in the centralized procedure, this process entails consulting
various European Commission Directorates General and the Standing Committee on Human Medicinal Products.

Data Exclusivity
In the European Union, marketing authorization applications for generic medicinal products do not need to include the results of pre-clinical and clinical
trials, but instead can refer to the data included in the marketing authorization of a reference product for which regulatory data exclusivity has expired. If a
marketing authorization is granted for a medicinal product containing a new active substance, that product benefits from eight years of data exclusivity,
during which generic marketing authorization applications referring to the data of that product may not be accepted by the regulatory authorities, and a
further two years of market exclusivity, during which such generic products may not be placed on the market. The two-year period may be extended to
three years if during the first eight years a new therapeutic indication with significant clinical benefit over existing therapies is approved.

Orphan Medicinal Products
The EMA’s Committee for Orphan Medicinal Products, or COMP, may recommend orphan medicinal product designation to promote the development of
products that are intended for the diagnosis, prevention or treatment of life-threatening or chronically debilitating conditions affecting not more than five in
10,000 persons in the European Union. Additionally, this designation is granted for products intended for the diagnosis, prevention or treatment of a life-
threatening, seriously debilitating or serious and chronic condition and when, without incentives, it is unlikely that sales of the product in the European
Union would be sufficient to justify the necessary investment in developing the medicinal product. The COMP may only recommend orphan medicinal
product designation when the product in question offers a significant clinical benefit over existing approved products for the relevant indication. Following
a positive opinion by the COMP, the European Commission adopts a decision granting orphan status. The COMP will reassess orphan status in parallel
with EMA review of a marketing authorization application and orphan status may be withdrawn at that stage if it no longer fulfills the orphan criteria (for
instance because in the meantime a new product was approved for the indication and no convincing data are available to demonstrate a significant benefit
over that product). Orphan medicinal product designation entitles a party to financial incentives such as a reduction of fees or fee waivers and 10 years of
market exclusivity is granted following marketing authorization. During this period, the competent authorities may not accept or approve any similar
medicinal product, unless it offers a significant clinical benefit. This period may be reduced to six years if the orphan medicinal product designation criteria
are no longer met, including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity.

Pediatric Development
In the European Union, companies developing a new medicinal product must agree to a Pediatric Investigation Plan, or PIP, with the EMA and must
conduct pediatric clinical trials in accordance with that PIP unless a waiver applies, for example, because the relevant disease or condition occurs only in
adults. The marketing authorization application for the product must include the results of pediatric clinical trials conducted in accordance with the PIP,
unless a waiver applies, or a deferral has been granted, in which case the pediatric clinical trials must be completed at a later date. Products that are granted
a marketing authorization on the basis of the pediatric clinical trials conducted in accordance with the PIP are eligible for a six-month extension of the
protection under a supplementary protection certificate (if the product covered by it qualifies for one at the time of approval). This pediatric reward is
subject to specific conditions and is not automatically available when data in compliance with the PIP are developed and submitted.

If we fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines, suspension of clinical trials,
suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions and criminal prosecution.

Reimbursement

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Sales of pharmaceutical products in the United States will depend, in part, on the extent to which the costs of the products will be covered by third-party
payers, such as government health programs, and commercial insurance and managed health care organizations. These third-party payers are increasingly
challenging the prices charged for medical products and services. Additionally, the containment of health care costs has become a priority of federal and
state governments, and the prices of drugs have been a focus in this effort. The U.S. government, state legislatures and foreign governments have shown
significant interest in implementing cost-containment programs, including price controls, utilization management 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. If these third-party payers do not consider our products to be cost-effective compared to other
available therapies, they may not cover our products after approval as a benefit under their plans or, if they do, the level of payment may not be sufficient to
allow us to sell our products on a profitable basis.

The Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or the MMA, imposed requirements for the distribution and pricing of
prescription drugs for Medicare beneficiaries and included a major expansion of the prescription drug benefit under Medicare Part D. Under Part D,
Medicare beneficiaries may enroll in prescription drug plans offered by private entities that provide coverage of outpatient prescription drugs. Part D is
available through both stand-alone prescription drug benefit plans and prescription drug coverage as a supplement to Medicare Advantage plans. Unlike
Medicare Parts A and B, Part D coverage is not standardized. Part D prescription drug plan sponsors are not required to pay for all covered Part D drugs,
and each drug plan can develop its own drug formulary that identifies which drugs it will cover and at what tier or level. However, Part D prescription drug
formularies must include drugs within each therapeutic category and class of covered Part D drugs, though not necessarily all the drugs in each category or
class. Any formulary used by a Part D prescription drug plan must be developed and reviewed by a pharmacy and therapeutic committee.

Government payment for some of the costs of prescription drugs may increase demand for products for which we receive marketing approval. However,
any negotiated prices for our products covered by a Part D prescription drug plan will likely be lower than the prices we might otherwise obtain. Moreover,
while the MMA applies only to drug benefits for Medicare beneficiaries, private payers often follow Medicare coverage policy and payment limitations in
setting their own payment rates. Any reduction in payment that results from the MMA may result in a similar reduction in payments from non-
governmental payers.

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act of 2010, collectively, the
ACA, was enacted with the goal of expanding coverage for the uninsured while at the same time containing overall health care costs. With regard to
pharmaceutical products, among other things, the ACA expanded and increased industry rebates for drugs covered under Medicaid programs and made
changes to the coverage requirements under the Medicare D program. There remain challenges to certain aspects of the ACA. Since January 2017,
President Trump has signed two Executive Orders and other directives designed to eliminate the implementation of certain provisions of the ACA or
otherwise circumvent some of the requirements for health insurance mandated by the ACA. Concurrently, Congress has considered legislation that would
repeal or repeal and replace all or part of the ACA. While Congress has not passed comprehensive repeal legislation, several bills affecting the
implementation of certain taxes under the ACA have been signed into law. The Tax Cuts and Jobs Act was enacted, which, among other things, included a
provision which repealed, effective January 1, 2019, the tax-based shared responsibility payment imposed by the ACA on certain individuals who fail to
maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate”. In addition, the 2020 federal
spending package permanently eliminated, effective January 1, 2020, the ACA-mandated “Cadillac” tax on certain high-cost employer-sponsored health
insurance plans and the medical device excise tax on non-exempt medical devices and, effective January 1, 2021, also eliminates the health insurer tax. On
December 14, 2018, a Texas U.S. District Court Judge ruled that the ACA is unconstitutional in its entirety because the “individual mandate” was repealed
by Congress as part of the Tax Cuts and Jobs Act. Additionally, on December 18, 2019, the U.S. Court of Appeals for the 5th Circuit upheld the District
Court ruling that that the individual mandate was unconstitutional and remanded the case back to the District Court to determine whether the remaining
provisions of the ACA are invalid as well. It is unclear how this decision, future decisions, subsequent appeals, and other efforts to repeal and replace the
ACA will impact the ACA.

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, some E.U. jurisdictions operate positive and negative list systems under which products
may only be marketed once a reimbursement price has been agreed. To obtain reimbursement or pricing approval, some of these countries may require the
completion of clinical trials that compare the cost-effectiveness of a particular product candidate to currently available therapies. Other member states
allow companies to fix their own prices for medicines but monitor and control company profits. Such differences in national pricing regimes may create
price

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differentials between E.U. member states. There can be no assurance that any country that has price controls or reimbursement limitations for
pharmaceutical products will allow favorable reimbursement and pricing arrangements for any of our products. Historically, products launched in the
European Union do not follow price structures of the United States. In the European Union, the downward pressure on healthcare costs in general,
particularly prescription medicines, has become intense. As a result, barriers to entry of new products are becoming increasingly high and patients are
unlikely to use a drug product that is not reimbursed by their government.

Pharmaceutical Coverage, Pricing and Reimbursement
Significant uncertainty exists as to the coverage and reimbursement status of any drug products for which we obtain regulatory approval. In the United
States, sales of any products for which we receive regulatory approval for commercial sale will depend in part on the availability of coverage and
reimbursement from third-party payors. Third-party payors include government authorities, managed care providers, private health insurers and other
organizations. Coverage and reimbursement policies for drug products can differ significantly from payor to payor as there is no uniform policy of
coverage and reimbursement for drug products among third party payors in the United States. Third-party payors often rely upon Medicare coverage policy
and payment limitations in setting their own reimbursement rates, but also have their own methods and approval process apart from Medicare
determinations. The process for determining whether a payor will provide coverage for a drug product may be separate from the process for setting the
reimbursement rate that the payor will pay for the drug product. Third-party payors may limit coverage to specific drug products on an approved list, or
formulary, which might not include all of the FDA-approved drugs for a particular indication. Moreover, a payor’s decision to provide coverage for a drug
product does not imply that an adequate reimbursement rate will be approved. Adequate third-party reimbursement may not be available to enable us to
maintain price levels sufficient to realize an appropriate return on our investment in product development.

Third-party payors are increasingly challenging the price and examining the medical necessity and cost-effectiveness of medical products and services, in
addition to their safety and efficacy. In order to obtain coverage and reimbursement for any product that might be approved for sale, we may need to
conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of our products, in addition to the costs
required to obtain regulatory approvals. Our product candidates may not be considered medically necessary or cost-effective. If third-party payors do not
consider a product to be cost-effective compared to other available therapies, they may not cover the product after approval as a benefit under their plans or,
if they do, the level of payment may not be sufficient to allow a company to sell its products at a profit.

Other Healthcare Laws and Compliance Requirements
Our current and future operations may subject us to various federal and state laws targeting fraud and abuse in the healthcare industry. These laws may
impact, among other things, our research and proposed sales, marketing and education programs. In addition, we may be subject to patient privacy
regulation by both the federal government and the states and foreign jurisdictions in which we conduct our business. The laws that may affect our ability to
operate include:

•

•

•

•

the federal Anti-Kickback Statute, which prohibits, among other things, persons from knowingly and willfully soliciting, receiving, offering or
paying remuneration, directly or indirectly, to induce, or in return for, the purchase or recommendation of an item or service reimbursable under a
federal healthcare program, such as the Medicare and Medicaid programs;
federal civil and criminal false claims laws and civil monetary penalty laws, which prohibit, among other things, individuals or entities from
knowingly presenting, or causing to be presented, claims for payment from Medicare, Medicaid, or other third-party payers that are false or
fraudulent;
the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which created additional federal criminal statutes that prohibit
executing a scheme to defraud any healthcare benefit program and making false statements relating to healthcare matters;
the federal transparency laws, including the federal Physician Payments Sunshine Act, that require drug manufacturers to disclose payments and
other transfers of value provided to physicians, as defined by such law, and teaching hospitals;

• HIPAA, as amended by the Health Information Technology and Clinical Health Act, or HITECH, and its implementing regulations, which

•

imposes certain requirements relating to the privacy, security and transmission of individually identifiable health information; and
Foreign and state law equivalents of each of the above federal laws, such as anti-kickback and false claims laws which may apply to items or
services reimbursed by any third-party payer, including commercial insurers, state and local laws governing the disclosure of payments to health
care professionals, state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance
guidelines and the relevant compliance guidance promulgated by the federal government, state laws that require the reporting of information
related to drug pricing, state and local laws requiring the registration of pharmaceutical sales representatives and state laws governing the privacy
and

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•

security of health information in certain circumstances, many of which differ from each other in significant ways and may not have the same
effect, thus complicating compliance efforts.
If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to it, we may be subject to
significant civil, criminal and administrative penalties, damages, fines, imprisonment, exclusion of products from government funded healthcare
programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations.

Employees
As of December 31, 2019, we employed 58 full-time employees. Of these employees, 38 were engaged in research and development and 20 were engaged
in general and administrative functions. All of our employees are located in the United States and Vienna, Austria. We have no collective bargaining
agreements with our employees and have not experienced any work stoppages. We consider our relationship with our employees to be good.

Corporate Information
We were incorporated under the laws of the State of Delaware in 2010 under the name Arsanis Inc. Following the Merger on March 13, 2019 with X4
Therapeutics Inc. (formerly X4 Pharmaceuticals Inc.), we changed our name to X4 Pharmaceuticals, Inc. Our principal executive offices are located at 955
Massachusetts Avenue, 4th Floor, Cambridge, Massachusetts 02139 and our telephone number is (857) 529-8300.

Available Information
We maintain a website at http://www.x4pharma.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, proxy statements, 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 are available free of charge on our
website as soon as reasonably practicable after electronically filing such reports with the SEC. Such reports and other information may be accessed through
the SEC's website at www.sec.gov. Information contained in our website is not part of this or any other report that we file with or furnish to the SEC.

ITEM 1A.  RISK FACTORS

An investment in shares of our common stock involves a high degree of risk. You should carefully consider the following information about these risks,
together with the other information appearing in our Annual Report on Form 10-K for the year ended December 31, 2019, before deciding to invest in our
common stock. The occurrence of any of the following risks could have a material adverse effect on our business, financial condition, results of operations
and future growth prospects. In these circumstances, the market price of our common stock could decline, and you may lose all or part of your investment.

Risks Related to Our Financial Position and Need for Additional Capital

We have incurred significant losses since our inception. We expect to continue to incur losses and may never generate profits from operations or
maintain profitability.
Since inception, we have incurred significant operating losses. Without regard to the historical operating results of our predecessor, Arsanis, our net losses
were $52.8 million, $33.3 million and $22.0 million for the years ended December 31, 2019, 2018 and 2017 respectively, and we had an accumulated
deficit of $132.0 million as of December 31, 2019. To date, we have financed our operations primarily through issuances of shares of common stock
warrants and prefunded warrants for the purchase of our preferred stock and our common stock, sales of preferred stock, proceeds from the issuance of
convertible debt and borrowings under loan and security agreements. In 2019, we completed a merger with Arsanis and acquired its $26.4 million of cash,
cash equivalents and restricted cash. We have not generated any revenue from product sales to date. We have devoted substantially all of our efforts to
research and development, including clinical trials. We have not completed the development of any drugs. We expect to continue to incur significant
expenses and increasing operating losses for at least the next few years as we conduct additional clinical trials for our product candidates; continue to
discover and develop additional product candidates; acquire or in-license other product candidates and technologies; maintain, expand and protect our
intellectual property portfolio; hire additional clinical, scientific and commercial personnel; establish a commercial manufacturing source and secure supply
chain capacity sufficient to provide commercial quantities of any product candidates for which we may obtain regulatory approval; seek regulatory
approvals for any product candidates that successfully complete clinical trials; establish a sales,

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marketing and distribution infrastructure to commercialize any products for which we may obtain regulatory approval; and add operational, financial and
management information systems and personnel, including personnel to support our product development and planned future commercialization efforts. We
may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our
future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenues. Even if we achieve profitability in
the future, we may not be able to sustain profitability in subsequent periods. The net losses we incur may fluctuate significantly from quarter to quarter and
year to year.

Our ability to generate profits from operations and thereafter to remain profitable depends heavily on:

•

•

•

•

•

•

•

•

•

•

the scope, number, progress, duration, endpoints, cost, results and timing of clinical trials and nonclinical studies of our current or
potential future product candidates, including in particular the scope, progress, duration, endpoints, cost, results and timing for
completion of our Phase 3 trial of mavorixafor for the treatment of WHIM syndrome, our Phase 1b clinical trial of mavorixafor for
the treatment of severe congenital neutropenia, or SCN, and our Phase 1b clinical trial of mavorixafor for the treatment of
Waldenström macroglobulinemia.

our ability to raise sufficient funds to support the development and potential commercialization of our product candidates;

the outcomes and timing of regulatory reviews, approvals or other actions;

our ability to obtain marketing approval for our product candidates;

our ability to establish and maintain licensing, collaboration or similar arrangements on favorable terms and whether and to what
extent we retain development or commercialization responsibilities under any new licensing, collaboration or similar arrangement;

the success of any other business, product or technology that we acquire or in which we invest;

our ability to maintain, expand and defend the scope of our intellectual property portfolio;

our ability to manufacture any approved products on commercially reasonable terms;

our ability to establish a sales and marketing organization or suitable third-party alternatives for any approved product; and

the number and characteristics of product candidates and programs that we pursue.

Based on our current plans, which will allow us to fund our operations for at least the 12 months following the filing of this Annual Report or Form 10-K,
we do not expect to generate significant revenue from product sales unless and until we (or a potential future licensee or collaborator) obtain marketing
approval for, and commercialize, one or more of our current or potential future product candidates. Neither we nor a licensee may ever succeed in obtaining
marketing approval for, or commercializing, our product candidates and, even if we do, we may never generate revenues that are significant enough to
generate profits from operations. Even if we do generate profits from operations, we may not be able to sustain or increase profitability on a quarterly or
annual basis. Our failure to generate profits from operations and remain profitable would decrease our value and could impair our ability to raise capital,
expand our business, maintain our research and development efforts, diversify our product offerings or continue our operations. A decline in our value
could also cause you to lose all or part of your investment.

Our limited operating history may make it difficult for you to evaluate the success of our business to date and to assess our future viability.

Without regard to the historical operations of Arsanis, our operations to date have been limited to organizing the company, entering into licensing
arrangements for mavorixafor, hiring a team of experienced personnel, raising capital, and undertaking nonclinical studies and clinical trials and regulatory
activities for our development programs, primarily mavorixafor. We have not yet demonstrated our ability to successfully complete development of any
product candidate, including large-scale, pivotal clinical trials required for regulatory approval of our product candidates, obtain marketing approvals,
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.

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Typically, it takes many years to develop one new product from the time it is discovered to when it is commercially available, if ever. In addition, the
CXCR4 receptor that we are pursuing with respect to our product candidates is a relatively novel target with a limited research and development history.
Consequently, any early predictions made about our future success or viability may not be as accurate as they could be if we had a longer operating history.

As an early-stage company, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors that may
alter or delay our plans. Assuming that we complete the development of and obtain marketing approval for any of our product candidates, we will need to
transition from a company with a research and development focus to a company capable of supporting commercial activities. We may encounter unforeseen
expenses, difficulties, complications and delays, and may not be successful in such a transition.

We will require substantial additional funding. If we are unable to raise capital when needed, we could be forced to delay, reduce or eliminate any
product development programs or commercialization efforts.

Our operations have consumed a large amount of cash since inception. We expect our research and development expenses to increase in future periods as
we continue to advance the clinical development of our product candidates and prepare for the launch and commercialization of any product candidates for
which we receive regulatory approval, including potentially building our own commercial organization to address the United States and certain other
markets. In addition, if we obtain marketing approval for any of our product candidates that are not then subject to licensing, collaboration or similar
arrangements with third parties, we expect to incur significant commercialization expenses related to product sales, marketing, distribution and
manufacturing. Furthermore, we expect to incur additional costs associated with operating as a public company in the United States. Accordingly, we will
need to obtain substantial additional funding in connection with our continuing operations.

We cannot be certain that additional funding will be available on acceptable terms, or at all. If we are unable to raise additional capital when needed or in
sufficient amounts or on terms acceptable to it, we could be forced to delay, reduce or eliminate our research and development programs or any future
commercialization efforts of one or more of our product candidates or one or more of our other research and development initiatives. We also could be
required to:

•

•

seek collaborators for one or more of our current or future product candidates at an earlier stage than otherwise would be desirable or
on terms that are less favorable than might otherwise be available; or

relinquish or license on unfavorable terms our rights to technologies or product candidates that we otherwise would seek to develop or
commercialize ourselves.

Our future funding requirements, both near and long-term, will depend on many factors, including, but not limited to:

•

•

•

•

the scope, number, initiation, progress, timing, costs, design, duration, any potential delays, and results of clinical trials and
nonclinical studies for our current or future product candidates, particularly our Phase 3 trial of mavorixafor for the treatment of
WHIM syndrome, our Phase 1b clinical trial of mavorixafor for the treatment of SCN, and our Phase 1b clinical trial of mavorixafor
for the treatment of WM;

the clinical development plans that we establish for these product candidates;

the number and characteristics of product candidates and programs that we develop or may in-license;

the outcome, timing and cost of regulatory reviews, approvals or other actions to meet regulatory requirements established by the U.S.
Food and Drug Administration, or FDA, and comparable foreign regulatory authorities, including the potential for the FDA or
comparable foreign regulatory authorities to require that we perform more studies for our product candidates than those that we
currently expect;

• our ability to obtain marketing approval for our product candidates;

•

the cost of filing, prosecuting, defending and enforcing our patent claims and other intellectual property rights covering our product
candidates, including any such patent claims and intellectual property rights that we have licensed from Genzyme pursuant to the
terms of our license agreement with Genzyme or from other third parties;

• our ability to maintain, expand and defend the scope of our intellectual property portfolio, including the cost of defending intellectual

property disputes, including patent infringement actions brought by third parties against us or our product candidates;

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•

the cost and timing of completion of commercial-scale outsourced manufacturing activities with respect to our product candidates;

• our ability to establish and maintain licensing, collaboration or similar arrangements on favorable terms and whether and to what

extent we retain development or commercialization responsibilities under any new licensing, collaboration or similar arrangement;

•

•

•

the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory
approval in regions where we choose to commercialize our products on our own;

the success of any other business, product or technology that we acquire or in which we invest;

the costs of acquiring, licensing or investing in businesses, product candidates and technologies;

• our need and ability to hire additional management and scientific and medical personnel;

•

the costs to operate as a public company, including the need to implement additional financial and reporting systems and other internal
systems and infrastructure for our business;

• market acceptance of our product candidates, to the extent any are approved for commercial sale; and

•

the effect of competing technological and market developments.

Conducting preclinical testing and clinical trials is a time-consuming, expensive and uncertain process that takes years to complete, and we may never
generate the necessary data or results required to obtain marketing approval and achieve product sales. In addition, our product candidates, if approved,
may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of products that will not be commercially available for
sale by us for at least the next few years, if at all. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives.
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. Additional financing may not be available to us on acceptable terms, or at all. The unavailability of additional
financing on acceptable terms, or at all, would have an adverse effect on your investment.

Raising additional capital may cause dilution to our investors, restrict our operations or require us to relinquish rights to our technologies or product
candidates. Future debt obligations may expose us to risks that could adversely affect our business, operating results and financial condition and may
result in further dilution to our stockholders.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings,
debt financings, and licensing, collaboration or similar arrangements. We do not have any committed external sources of funds and may seek to raise
additional capital at any time. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest
will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a holder of our common
stock. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as
incurring additional debt, making capital expenditures, declaring dividends or other distributions, acquiring or licensing intellectual property rights and
other operating restrictions that could adversely impact our ability to conduct our business and may result in liens being placed on our assets and
intellectual property. If we default on such indebtedness, we could lose such assets and intellectual property.

If we raise additional funds through licensing, collaboration or similar arrangements with third parties, we may have to relinquish valuable rights to our
technologies, future revenue streams, research and development programs or product candidates or grant licenses on terms that are not favorable to us. If
we are unable to raise additional funds through equity or debt financings or through licensing, collaboration or similar arrangements when needed, we may
be required to delay, limit, reduce or terminate our 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.

We have not generated any revenues since inception and may never become profitable.

To date, we have not generated any revenues. Our ability to generate revenue and become profitable depends upon our ability to successfully obtain
marketing approval and commercialize our product candidates, including mavorixafor-based product candidates, X4P-002, X4P-003 or other product
candidates that we may develop, in-license or acquire in the future. Even if we are able to successfully achieve regulatory approval for these product
candidates, we are unable to predict the extent of any future

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losses and do not know when any of these product candidates will generate revenue for us, if at all. Our ability to generate revenue from mavorixafor or
other product candidates also depends on a number of additional factors, including our ability to:

•

•

•

•

successfully complete development activities, including all necessary nonclinical studies and clinical trials;

complete and submit New Drug Applications, or NDAs, to the FDA and obtain regulatory approval for indications for which there is a
commercial market;

complete and submit marketing applications to, and obtain regulatory approval from, foreign regulatory authorities;

set and obtain a commercially viable price for our products;

• obtain commercial quantities of our products at acceptable cost levels;

• develop a commercial organization capable of sales, marketing and distribution for the products we intend to sell ourselves in the

markets in which we have retained commercialization rights;

•

find suitable collaborators to help us market, sell and distribute our approved products in other markets; and

• obtain coverage and adequate reimbursement from third-party, including government, payors.

In addition, because of the numerous risks and uncertainties associated with product development, including the possibility that our product candidates may
not advance through development or demonstrate safety and efficacy for their intended uses, the FDA or any other regulatory agency may require
additional clinical trials or nonclinical studies. We are unable to predict the timing or amount of increased expenses, or when or if we will be able to
achieve or maintain profitability, and such expense could increase beyond our expectations if the FDA or any other regulatory agency requires such
additional clinical trials or nonclinical studies as part of the application and approval process or post-approval process if we are successful at achieving
regulatory approval. Even if we are able to successfully complete the development and regulatory reviews described above, we anticipate incurring
significant costs associated with commercializing these products, if they are approved.

Even if we are able to generate revenues from the sale of our product candidates, we may not become profitable and may need to obtain additional funding
to continue operations. 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 our operations. If we do achieve profitability, we may not be able to sustain or increase profitability on
a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of the company and could impair our ability to raise
capital, maintain our discovery and preclinical development efforts, expand our business or continue our operations and may require us to raise additional
capital that may dilute your ownership interest. A decline in our value could also cause you to lose all or part of your investment.

Risks Related to Development and Commercialization of Our Product Candidates

We depend almost entirely on the success of our lead product candidate, mavorixafor, which we are developing initially for the treatment of WHIM
syndrome, for the treatment of SCN, for the treatment of WM, and with a potential strategic partner, for the treatment of ccRCC. We cannot be certain
that we will be able to obtain regulatory approval for, or successfully commercialize, mavorixafor or any other product candidate.

Our business depends almost entirely on the successful clinical development, regulatory approval and commercialization of mavorixafor. We currently have
no drug product for sale and may never be able to develop marketable drug products. We initiated a global Phase 3 pivotal clinical trial of our lead product
candidate, mavorixafor, in WHIM patients in the second quarter of 2019, and may be required to complete additional nonclinical studies and clinical trials
before we can seek regulatory approval. In the fourth quarter of 2019, we also initiated a Phase 1b clinical trial of mavorixafor for the treatment of SCN
and WM. Having completed our Phase 2a clinical trial, we do not plan to develop mavorixafor for the treatment of ccRCC on our own. Our other
programs, including X4P-002 and X4P-003, are still in the preclinical development stage. The clinical trials of our product candidates are, and the
manufacturing and marketing of our product candidates will be, subject to extensive and rigorous review and regulation by government authorities in the
United States and in other countries where we intend to test and, if approved, market any product candidate. Before obtaining regulatory approvals for the
commercial sale of any product candidate, we must successfully meet a number of critical developmental milestones, including:

• developing dosages that will be well-tolerated, safe and effective;

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•

completing the development and scale-up to permit manufacture of our product candidates in commercial quantities and at acceptable
costs;

• demonstrating through pivotal clinical trials that each product candidate is safe and effective in patients for the intended indication;

•

establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers; and

• obtaining and maintaining patent and trade secret protection and non-patent exclusivity for our product candidates.

The time necessary to achieve these developmental milestones for any individual product candidate is long and uncertain, and we may not successfully
complete these milestones for mavorixafor or any other product candidates that we may develop. We have not yet completed development of any product
candidate. We also may not be able to finalize the design or formulation for our other programs, X4P-002 for the treatment of glioblastoma multiforme, or
GBM, and X4P-003, a next generation molecule for the treatment of rare diseases linked to defects in CXCR4 trafficking.

We are continuing to test and develop our product candidates and may explore possible design or formulation changes to address safety, efficacy,
manufacturing efficiency and performance issues to the extent any arise. We may not be able to complete development of any product candidates that
demonstrate safety and efficacy and that will have a commercially reasonable treatment and storage period. If we are unable to complete development of
mavorixafor or any other product candidates that we may develop, we will not be able to commercialize and earn revenue from them.

We expect to develop mavorixafor, and potentially future product candidates, in combination with other therapies, which exposes us to additional risks.

We intend to develop mavorixafor, and may develop future product candidates, in combination with one or more currently approved cancer therapies. Even
if any product candidate we develop were to receive marketing approval or be commercialized for use in combination with other existing therapies, we
would continue to be subject to the risks that the FDA or similar regulatory authorities outside of the United States could revoke approval of the therapy
used in combination with our product candidate or that safety, efficacy, manufacturing or supply issues could arise with these existing therapies.
Combination therapies are commonly used for the treatment of cancer, and we would be subject to similar risks if we develop any of our product candidates
for use in combination with other drugs or for indications other than cancer. This could result in our own products being removed from the market or being
less successful commercially.

We may also evaluate mavorixafor or any other future product candidates in combination with one or more other cancer therapies that have not yet been
approved for marketing by the FDA or similar regulatory authorities outside of the United States. We will not be able to market and sell mavorixafor or any
product candidate we develop in combination with any such unapproved cancer therapies that do not ultimately obtain marketing approval.

If the FDA or similar regulatory authorities outside of the United States do not approve these other drugs or revoke their approval of, or if safety, efficacy,
manufacturing or supply issues arise with, the drugs that we choose to evaluate in combination with mavorixafor or any product candidate we develop, we
may be unable to obtain approval of or market mavorixafor or any product candidate we develop.

The regulatory review and approval processes of the FDA and comparable foreign regulatory authorities are lengthy, time-consuming and inherently
unpredictable, and if we are ultimately unable to obtain regulatory approval for our product candidates, including mavorixafor, our business will be
substantially harmed.

Of the large number of drugs in development in the United States, only a small percentage receive FDA regulatory approval and are commercialized in the
United States. We are not permitted to market mavorixafor or any other product candidate in the United States until we receive approval of an NDA from
the FDA, or in any foreign countries until we receive the requisite approval from such countries or jurisdictions, such as the marketing authorization
application, or MAA, in the European Union from the European Medicines Agency, or EMA. Prior to submitting an NDA to the FDA for approval of
mavorixafor for the treatment of WHIM syndrome, we will need to successfully complete the current Phase 3 pivotal clinical trial of mavorixafor in
patients with WHIM syndrome and potentially additional clinical trials and/or nonclinical studies. Successfully completing clinical trials and

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obtaining approval of an NDA is a complex, lengthy, expensive and uncertain process, and the FDA, or a comparable foreign regulatory authority, may
delay, limit or deny approval of mavorixafor for the treatment of WHIM syndrome or other indications for many reasons, including, among others:

• disagreement with the design or implementation of our clinical trials;

• disagreement with the sufficiency of our clinical trials;

•

•

•

failure to demonstrate the safety and efficacy of mavorixafor or any other product candidate for its proposed indications;

failure to demonstrate that any clinical and other benefits of mavorixafor or any other product candidate outweigh its safety risks;

a negative interpretation of the data from our nonclinical studies or clinical trials;

• deficiencies in the manufacturing or control processes or failure of third-party manufacturing facilities with which we contract for

clinical and commercial supplies to comply with current Good Manufacturing Practice requirements, or cGMPs;

•

•

insufficient data collected from clinical trials of mavorixafor or changes in the approval requirements that render its nonclinical and
clinical data insufficient to support the filing of an NDA or to obtain regulatory approval; or

changes in clinical practice in or approved products available for the treatment of the target patient population that could have an
impact on the indications that we are pursuing for mavorixafor or our other product candidates.

The FDA or a comparable foreign regulatory authority may also require more information, including additional nonclinical or clinical data to support
approval, which may delay or prevent approval of our commercialization plans, or cause us to abandon the development program. Even if we obtain
regulatory approval, our product candidates may be approved for fewer or more limited indications than we request, such approval may be contingent on
the performance of costly post-marketing clinical trials, or we may not be allowed to include the labeling claims necessary or desirable for the successful
commercialization of such product candidate. For instance, it is possible that mavorixafor could be approved for an indication but fail to be used for
treating patients in that indication due to the availability of other available treatments or then-accepted clinical practice.

We depend on license agreements with Genzyme, Beth Israel Deaconess Medical Center and Georgetown University to permit us to use patents and
patent applications. Termination of these rights or the failure to comply with obligations under these agreements could materially harm our business
and prevent us from developing or commercializing our product candidates.

We are party to license agreements with Genzyme, Beth Israel Deaconess Medical Center and Georgetown University under which we were granted rights
to patents and patent applications that are important to our business. We rely on these license agreements in order to be able to use various proprietary
technologies that are material to our business, including certain patents and patent applications that cover our product candidates, including mavorixafor.
Our rights to use these patents and patent applications and employ the inventions claimed in these licensed patents are subject to the continuation of and our
compliance with the terms of our license agreements.

Our license agreement with Genzyme imposes upon us various diligence, payment and other obligations, including the following:

• our obligation to pay Genzyme milestone payments in the aggregate amount of up to $25.0 million, contingent upon our achievement

of certain late-stage regulatory and sales milestones with respect to licensed products.

• our obligation to pay Genzyme tiered royalties based on net sales of licensed products that we commercialize under the agreement.

• our obligation to pay Genzyme a certain percentage of cash payments received by us or our affiliates in consideration for the grant of

a sublicense under the license granted to us by Genzyme.

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If we fail to comply with any of our obligations under the Genzyme license agreement, or we are subject to a bankruptcy, Genzyme may have the right to
terminate the license agreement, in which event we would not be able to market any product candidates covered by the license.

Prior to July 2014, we did not control the prosecution, maintenance, or filing of the patents and patent applications that are licensed to us under the
Genzyme license agreement, or the enforcement of these patents and patent applications against infringement by third parties. Thus, these patents and
patent applications were not drafted by us or our attorneys, and we did not control or have any input into the prosecution of these patents and patent
applications prior to our execution of the Genzyme license agreement in July 2014. Under the terms of the license agreement with Genzyme, since July
2014, we have controlled the right to control the prosecution, maintenance, and filing of the patents and patent applications that are licensed to us, and the
enforcement of these patents and patent applications against infringement by third parties. However, we cannot be certain that the same level of attention
was given to the drafting and prosecution of these patents and patent applications as we may have used if we had control over the drafting and prosecution
of such patents and patent applications. We also cannot be certain that drafting or prosecution of the patents and patent applications licensed to us has been
conducted in compliance with applicable laws and regulations or will result in valid and enforceable patents.

Pursuant to our license agreement with Beth Israel Deaconess Medical Center, we paid an upfront, one-time fee for the rights granted by the license
agreement. This license agreement imposes upon us various obligations, including the requirement to provide Beth Israel Deaconess Medical Center with
progress reports at regular intervals and to maintain specified levels of insurance. Beth Israel Deaconess Medical Center may terminate the agreement for
our non-payment, insolvency or default of material obligations. We have the right to terminate the agreement for any reason upon 90 days' advance written
notice.

Our license agreement with Georgetown imposes upon us various diligence, payment and other obligations, including our obligations to pay Georgetown
milestone payments in the aggregate amount of up to $0.8 million, contingent upon our achievement of certain sales milestones with respect to licensed
products, to deliver reports upon certain events and at regular intervals and to maintain customary levels of insurance. Georgetown may terminate the
agreement for our non-payment, insolvency, failure to maintain insurance or default of material obligations. We have the right to terminate the agreement
for any reason upon 60 days advance written notice.

Disputes may arise under any of our license agreements with Genzyme, Beth Israel Deaconess Medical Center and/or Georgetown University regarding the
intellectual property that is subject to such license agreement, including:

•

the scope of rights granted under the applicable license agreement and other interpretation-related issues;

• whether and the extent to which our technology and processes infringe on intellectual property that is not subject to the applicable

license agreement;

• our diligence obligations with respect to the use of the licensed technology under the applicable license agreement to develop and
commercialize products and technologies, including the level of effort and specific activities that will satisfy those diligence
obligations; and

•

the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by us and our collaborators.

If disputes over intellectual property that we have licensed prevent or impair our ability to maintain any of our license agreements on acceptable terms, we
may be unable to successfully develop and commercialize the affected product candidates and technologies.

The results of clinical trials may not support our product candidate claims.

Even if our clinical trials are completed as planned, we cannot be certain that their results will support the proposed product candidates, that the FDA or
foreign government authorities will agree with our conclusions regarding such results, or that the FDA or foreign governmental authorities will not require
additional clinical trials. Success in preclinical testing and early clinical trials does not ensure that later clinical trials will be successful and the results of
later clinical trials often do not replicate the results of prior clinical trials and preclinical testing. The clinical trial results may fail to demonstrate that our
product candidates are safe for humans and effective for the intended indications. This failure could cause us to abandon a product candidate and may delay
development of other product candidates. Any delay in, or termination of, our clinical trials will delay or prevent the submission of our marketing
applications (NDA and/or MAA) and, ultimately, our ability to obtain approval and commercialize

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our product candidates and generate product revenues. Information about certain clinical trials, including results (positive or negative) will be made public
according to each country’s clinical trial register policies. Competitors may use this publicly available information to gain knowledge regarding the
progress of development programs.

Delays in our clinical trials may lead to a delay in the submission of our marketing approval application and jeopardize our ability to potentially receive
approvals and generate revenues from the sale of our products.

We may experience delays in our current or future clinical trials, including our Phase 3 trial of mavorixafor for the treatment of WHIM syndrome, our
Phase 1b clinical trial of mavorixafor for the treatment of SCN, and our Phase 1b clinical trial of mavorixafor for the treatment of WM. We do not know
whether planned clinical trials will begin or enroll subjects on time, need to be redesigned or be completed on schedule, if at all. Clinical trials may be
delayed, suspended or terminated for a variety of reasons, such as:

• delay or failure in reaching agreement with the FDA or a comparable foreign regulatory authority on a trial design that we are able to

execute;

• delay or failure in obtaining authorization to commence a trial or inability to comply with conditions imposed by a regulatory

authority regarding the scope or design of a clinical trial;

•

inability, delay or failure in identifying and maintaining a sufficient number of trial sites, many of which may already be engaged in
competing clinical trial programs;

• delay or failure in recruiting and enrolling suitable subjects to participate in a trial;

• delay or failure in having subjects complete a trial or return for post-treatment follow-up;

•

clinical sites and investigators deviating from trial protocol, failing to conduct the trial in accordance with regulatory requirements, or
dropping out of a trial;

• delay or failure in reaching agreement on acceptable terms with prospective clinical research organizations, or 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;

• delay or failure in obtaining institutional review board, or IRB, approval to conduct a clinical trial at each site;

• delays resulting from negative or equivocal findings of the Data Safety Monitoring Board, or DSMB, if any;

•

ambiguous or negative results;

• decision by the FDA, a comparable foreign regulatory authority, or recommendation by a DSMB to suspend or terminate clinical trials

at any time for safety issues or for any other reason;

•

•

•

inadequate drug product for use in nonclinical studies or clinical trials;

lack of adequate funding to continue the product development program; or

changes in governmental regulations or requirements.

Any delays in completing our clinical trials will increase our costs, slow down our product candidate development and approval process and jeopardize our
ability to commence product sales and generate revenues. Any of these occurrences may significantly harm our business, financial condition and prospects.
In addition, many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of
regulatory approval of our product candidates.

We may fail to enroll a sufficient number of patients in our clinical trials in a timely manner, which could delay or prevent clinical trials of our product
candidates.

Identifying and qualifying patients to participate in clinical trials of our product candidates is critical to our success. The timing of our clinical trials
depends on the rate at which we can recruit and enroll patients in testing our product candidates. The timing of our clinical trials depends in part on the
speed at which we can recruit patients to participate in testing mavorixafor and any other current or future product candidates that we may develop as well
as completion of required follow-up periods. If we cannot identify patients to participate in our clinical trials or if patients are unwilling to participate in our
clinical trials for any reason,

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including if patients choose to enroll in competitive clinical trials for similar patient populations, the timeline for recruiting patients, conducting studies and
obtaining regulatory approval of mavorixafor and any other current or future product candidates that we may develop may be delayed. These delays could
result in increased costs, delays in advancing our current or future product candidates, including mavorixafor, X4P-002 or X4P-003, delays in testing the
effectiveness of our product candidates or termination of the clinical trials altogether.

We may not be able to identify, recruit and enroll a sufficient number of patients, or those with required or desired characteristics to achieve diversity in a
trial, to complete our clinical trials in a timely manner. In particular, we are currently evaluating mavorixafor for the treatment of WHIM syndrome, SCN
and WM, rare diseases with limited patient pools from which to draw for clinical trials. The eligibility criteria of our clinical trials will further limit the
pool of available trial participants.

Patient enrollment, a significant factor in the duration of clinical trials, is also affected by many factors, including:

•

•

•

•

•

•

•

the severity of the disease under investigation;

the size and nature of the patient population (particularly with respect to orphan drugs which, by definition, are intended for a
relatively small patient population);

the eligibility criteria for the clinical trial in question;

the design of the clinical trial;

the inability to obtain and maintain patient consents;

the risk that enrolled subjects will drop out before completion;

clinicians’ and patients’ perceptions as to the potential advantages of the drug being studied in relation to other available therapies,
including any new drug that may be approved or for which clinical trials are initiated for the indications that we are investigating;

• our CROs and our trial sites’ efforts to facilitate timely screening and enrollment in clinical trials;

• patient referral practices of physicians; and

• our ability to monitor patients adequately during and after treatment.

We have made certain assumptions about the rate at which we can enroll patients in our clinical trials. To the extent that we do not meet this enrollment
target, our projected timeline for development of our product candidates may be slowed. We rely on CROs and clinical trial sites to ensure the proper and
timely conduct of our clinical trials and while we will have agreements governing their activities, we have limited control over their actual performance.

If we experience difficulty enrolling a sufficient number of patients to conduct our clinical trials as planned, we may be forced to delay, limit or terminate
ongoing or planned clinical trials of our product candidates, which would delay our ability to obtain approvals and generate product revenues from any of
these product candidates.

If the commercial opportunity in WHIM syndrome, SCN or WM is smaller than we anticipate, our potential future revenue from mavorixafor for the
treatment of any of the diseases may be adversely affected and our business may suffer.

If the size of the commercial opportunities in any of our target indications is smaller than we anticipate, we may not be able to achieve profitability and
growth. We are developing mavorixafor initially as a treatment for patients with WHIM syndrome and also as a treatment for other rare diseases, including
primary immunodeficiencies such as SCN and cancer such as WM. WHIM syndrome, SCN and WM each have a limited patient population.

For example, we are aware of only a few small available patient registries for WHIM syndrome, and we rely on various estimates and assumptions to
estimate the addressable WHIM syndrome population. Based on a preliminary independent market research study conducted by a third-party research firm
study that we sponsored, we estimate there are more than 1,000 genetically confirmed WHIM patients in the United States. If the commercial opportunity
in WHIM syndrome is smaller than we anticipate, whether because our estimates of the addressable patient population prove to be incorrect or for other
reasons, our potential future revenue from mavorixafor may be adversely affected and our business may suffer.

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It is critical to our ability to grow and become profitable that we successfully identify patients with WHIM syndrome, SCN and WM. Our projections of the
number of people who have WHIM syndrome (or its other potential primary immunodeficiencies), SCN or WM are based on a variety of sources,
including third-party estimates and analyses in the scientific literature, and may prove to be incorrect. Further, new information may emerge that changes
our estimate of the prevalence of these diseases or the number of patient candidates for each disease. The effort to identify patients for treatment is at an
early stage, and we cannot accurately predict the number of patients for whom treatment might be possible. Additionally, the addressable patient population
for our indications may be limited or may not be amenable to treatment with mavorixafor, and new patients may become increasingly difficult to identify or
gain access to, which would adversely affect our results of operations and our business.

If we experience any of a number of possible unforeseen events in connection with our clinical trials, potential marketing approval or
commercialization of our product candidates, or our entry into licensing, collaboration or similar arrangements, could be delayed or prevented.

We may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval
or commercialize our product candidates, including:

•

•

clinical trials of our product candidates may produce negative or inconclusive results, and 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 or participants may drop out of these clinical trials at a higher rate than we anticipate;

• we may be unable to recruit and enroll a sufficient number of patients in our clinical trials to ensure adequate statistical power to

detect any statistically significant treatment effects;

• our third-party contractors may fail to comply with regulatory requirements or meet their contractual obligations to us in a timely

manner, or at all;

•

regulators, institutional review boards or independent ethics committees may not authorize us or our investigators to commence a
clinical trial or conduct a clinical trial at a prospective trial site;

• we may experience delays in reaching, or we may fail to reach, agreement on acceptable clinical trial contracts or clinical trial

protocols with prospective trial sites;

• we may have to suspend or terminate clinical trials of our product candidates for various reasons, including a finding that the

participants are being exposed to unacceptable health risks or undesirable side effects;

•

•

•

regulators, institutional review boards or independent ethics committees may require that we or our investigators suspend or terminate
clinical research for various reasons, including noncompliance with regulatory requirements or a finding that the participants are being
exposed to unacceptable health risks;

the cost of clinical trials of our product candidates may be greater than we anticipate;

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

• our product candidates may have undesirable side effects or other unexpected characteristics, causing us or our investigators,

regulators, institutional review boards or independent ethics committees to suspend or terminate the clinical trials.

Our product development costs will increase if we experience delays in testing or marketing approvals. We do not know whether any preclinical tests or
clinical trials will begin as planned, will need to be redesigned or will be completed on schedule, or at all. Significant preclinical study or clinical trial
delays also could shorten any periods during which we may have the exclusive right to commercialize our product candidates, if they are approved, 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.

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.

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Because we have limited financial and managerial resources, we focus on specific product candidates. Currently, we are focusing our resources
predominantly on the development mavorixafor for the treatment of WHIM syndrome, for the treatment of SCN and for the treatment of WM. As a result,
we may forego or delay pursuit of opportunities with other product candidates or for other indications that have or that could later prove to have greater
commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or alternate and/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 products. 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 such product candidate.

Risks Related to the Marketing and Commercialization of Our Product Candidates

If we are unable to establish sales and marketing capabilities to market and sell our product candidates, we may be unable to generate any revenue.

Even if we are ultimately successful in obtaining regulatory approval of mavorixafor for the treatment of WHIM syndrome or another indication, in order
to market and sell mavorixafor and our other product candidates in development, we currently intend to build and develop our own sales, marketing and
distribution operations. Although our management team has previous experience with such efforts, there can be no assurance that we will be successful in
building these operations. If we are unable to establish adequate sales, marketing and distribution capabilities, we may not be able to generate product
revenue and may not become profitable. We will also be competing with many companies that currently have extensive and well-funded sales and
marketing operations. If any of our product candidates are approved, we may be unable to compete successfully against these more established companies.

Our commercial success depends upon attaining significant market acceptance of our product candidates, if approved, among hospitals, physicians,
patients and healthcare payors.

Even if we obtain regulatory approval for any of our product candidates that we may develop or acquire in the future, the product may not gain market
acceptance among hospitals, physicians, health care payors, patients and the medical community. Market acceptance of any of our product candidates for
which we receive approval depends on a number of factors, including:

•

•

•

•

•

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

the clinical indications for which the product candidate is approved;

acceptance by major operators of hospitals, physicians and patients of the product candidate as a safe and effective treatment,
particularly the ability of mavorixafor and our other product candidates to establish themselves as a new standard of care in the
treatment paradigm for the indications that we are pursuing;

the potential and perceived advantages of our product candidates over alternative treatments as compared to the relative costs of the
product candidates and alternative treatments;

the prevalence and severity of any side effects with respect to our product candidates, including mavorixafor;

• our ability to offer any approved products for sale at competitive prices;

•

the timing of market introduction of our products as well as competitive products;

• our pricing, and the availability of coverage and adequate reimbursement by third party payors and government authorities;

•

•

relative convenience and ease of administration; and

the effectiveness of our sales and marketing efforts and those of our potential future collaborators.

There may be delays in getting our product candidates, if approved, on hospital or insurance formularies or limitations on coverages that may be available
in the early stages of commercialization for newly approved drugs. If any of our product candidates are approved but fail to achieve market acceptance
among hospitals, physicians, patients or health care payors, we will

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not be able to generate significant revenues, which would have a material adverse effect on our business, prospects, financial condition and results of
operations.

Product candidates may cause undesirable side effects that could delay or prevent their marketing approval, limit the commercial profile of an
approved label, or result in significant negative consequences following marketing approval, if any, including marketing withdrawal.

Undesirable side effects caused by any of our product candidates that we may develop or acquire could cause us or the FDA or other regulatory authorities
to interrupt, delay or halt our clinical trials and could result in more restrictive labels or the delay or denial of marketing approval by the FDA or other
regulatory authorities of such product candidates. Results of our clinical trials could reveal a high and unacceptable severity and prevalence of these or
other side effects. In such an event, our trials could be suspended or terminated and the FDA or comparable foreign regulatory authorities could order us to
cease further development of or deny approval of our product candidates for any or all targeted indications. In addition, any drug-related side effects could
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.

Further, clinical trials by their nature utilize a sample of the potential patient population. With a limited number of patients, rare and severe side effects of
our product candidates may only be uncovered with a significantly larger number of patients exposed to the product candidate. If our product candidates
receive marketing approval and we or others identify undesirable side effects caused by such product candidates (or any other similar drugs) after such
approval, a number of potentially significant negative consequences could result, including:

•

•

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

regulatory authorities may require the addition of labeling statements, such as a “boxed” warning or a contraindication;

• we may be required to create a medication guide outlining the risks of such side effects for distribution to patients;

• we may be required to change the way such product candidates are distributed or administered, conduct additional clinical trials or

change the labeling of the product candidates;

•

regulatory authorities may require a Risk Evaluation and Mitigation Strategy plan to mitigate risks, which could include medication
guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and
other risk minimization tools;

• we may be subject to regulatory investigations and government enforcement actions;

• we may decide to remove such product candidates from the marketplace after they are approved;

• we could be sued and held liable for injury caused to individuals exposed to or taking our product candidates; 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 candidates and could
substantially increase the costs of commercializing our product candidates, if approved, and significantly impact our ability to successfully commercialize
our product candidates and generate revenues.

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.

Although we do not currently have any drugs on the market, we are, and once we begin commercializing our product candidates, we will be subject to
additional healthcare statutory and regulatory requirements and enforcement by the federal government and the states and foreign governments in the
jurisdictions in which we conduct our business. Healthcare providers, physicians and third-party payors will play a primary role in the recommendation and
prescription of any product candidates for which we obtain marketing approval. Our current and future arrangements with third-party payors and customers
may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements

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and relationships through which we market, sell and distribute any products for which we obtain marketing approval. Restrictions under applicable federal
and state healthcare laws and regulations include the following:

•

•

•

•

the federal Anti-Kickback Statute prohibits, among other things, persons from knowingly and willfully soliciting, offering, receiving
or paying remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, 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 a federal
healthcare program such as Medicare and Medicaid; 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 federal false claims laws impose criminal and civil penalties, including civil whistleblower or 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; in
addition, the government may assert that a claim including items and 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 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 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;
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 federal physician payment transparency requirements, sometimes referred to as the “Sunshine Act” under the Patient Protection
and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively the ACA, require
manufacturers of drugs, devices, biologics and medical supplies that are reimbursable under Medicare, Medicaid, or the Children’s
Health Insurance Program to report to CMS information related to payments and other transfers of value to physicians, as defined by
such law, and teaching hospitals and the ownership and investment interests of physicians and their immediate family members in
such manufacturers;

• HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act and its implementing regulations,
which also imposes obligations on certain covered entity healthcare providers, health plans, and healthcare clearinghouses 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;

•

•

•

•

analogous state and foreign 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;

some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and
the relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information
related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures;

state and local laws that require the registration of pharmaceutical sales representatives; and

state and foreign laws also govern the privacy and security of health information in certain circumstances, many of which differ from
each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.

Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve substantial
costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or
case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or
any other governmental regulations that may apply to it, we may be subject to significant civil, criminal and administrative penalties, damages, fines,
imprisonment, exclusion of products from government funded healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of

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our operations. If any of the physicians or other healthcare providers or entities with whom we expect to do business is found to be not in compliance with
applicable laws, they may be subject to significant criminal, civil or administrative sanctions, including exclusions from government funded healthcare
programs.

Current and future legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our product candidates
and affect the prices we may obtain.

In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the
healthcare system that could prevent or delay marketing approval of our product candidates, restrict post-approval activities and affect our ability to sell
profitably any product candidates for which we obtain marketing approval.

In the United States, Medicare covers certain drug purchases by the elderly and eligible disabled people and introduced a reimbursement methodology
based on average sales prices for physician-administered drugs. In addition, Medicare may limit the number of drugs that will be covered in any therapeutic
class. Ongoing cost reduction initiatives and future laws could decrease the coverage and price that we will receive for any approved products. While
Medicare beneficiaries are limited to most elderly and certain disabled individual, private payors often follow Medicare coverage policy and payment
limitations in setting their own payment rates.

In March 2010, the Affordable Care Act, or ACA became law. The ACA is a sweeping law intended to broaden access to health insurance, reduce or
constrain the growth of healthcare spending, enhance remedies against fraud and abuse, add new transparency requirements for the healthcare and health
insurance industries, impose new taxes and fees on the health industry and impose additional health policy reforms. Among the provisions of the ACA of
importance to our product candidates are the following:

•

•

•

•

•

•

•

an annual, nondeductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic products;

an increase in the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program;

expansion of healthcare fraud and abuse laws, including the False Claims Act and the Anti-Kickback Statute, new government
investigative powers, and enhanced penalties for noncompliance;

a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 70% point-of-sale discounts off
negotiated prices;

extension of manufacturers’ Medicaid rebate liability;

expansion of eligibility criteria for Medicaid programs;

expansion of the entities eligible for discounts under the Public Health Service Act’s pharmaceutical pricing program;

• new requirements to report to CMS financial arrangements with physicians, as defined by such law, and teaching hospitals;

•

•

a new requirement to annually report to FDA drug samples that manufacturers and distributors provide to physicians; and

a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness
research, along with funding for such research.

There remain challenges to certain aspects of the ACA, and we expect there will be additional challenges and amendments to the ACA in the future. Since
January 2017, President Trump has signed two Executive Orders and other directives designed to eliminate the implementation of certain provisions of the
ACA or otherwise circumvent some of the requirements for health insurance mandated by the ACA. Concurrently, Congress has considered legislation that
would repeal or repeal and replace all or part of the ACA. While Congress has not passed comprehensive repeal legislation, several bills affecting the
implementation of certain taxes under the ACA have been signed into law. The Tax Cuts and Jobs Act was enacted, which, among other things, included a
provision which repealed, effective January 1, 2019, the tax-based shared responsibility payment imposed by the ACA on certain individuals who fail to
maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate”. In addition, the 2020 federal
spending package permanently eliminated, effective January 1, 2020, the

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ACA-mandated “Cadillac” tax on certain high-cost employer-sponsored health insurance plans and the medical device excise tax on non-exempt medical
devices and, effective January 1, 2021, also eliminates the health insurer tax. On December 14, 2018, a Texas U.S. District Court Judge ruled that the ACA
is unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax Cuts and Jobs Act. Additionally, on
December 18, 2019, the U.S. Court of Appeals for the 5th Circuit upheld the District Court ruling that that the individual mandate was unconstitutional and
remanded the case back to the District Court to determine whether the remaining provisions of the ACA are invalid as well. It is unclear how this decision,
future decisions, subsequent appeals, and other efforts to repeal and replace the ACA will impact the ACA.

In addition, other legislative changes have been proposed and adopted since the ACA was enacted. These new laws may result in additional reductions in
Medicare and other healthcare funding.

There has also 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 bills 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. For example, the
Trump administration’s budget proposal for fiscal year 2021 includes a $135 billion allowance to support legislative proposals seeking to reduce drug
prices, increase competition, lower out-of-pocket drug costs for patients, and increase patient access to lower-cost generic and biosimilar drugs. Further, the
Trump administration released a “Blueprint” to lower drug prices and reduce out of pocket costs of drugs that contains additional proposals to increase drug
manufacturer competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower the list price of their
products, and reduce the out of pocket costs of drug products paid by consumers. The Department of Health and Human Services, or HHS, has solicited
feedback on some of these measures and has implemented others under its existing authority. While some of these and other measures may require
additional authorization to become effective. Congress and the Trump administration have each indicated that it will continue to seek new legislative and/or
administrative measures to control drug costs. 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.

We expect that the ACA, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria and
in additional downward pressure on the price that we will receive for any approved product. Any reduction in payments from Medicare or other
government programs may result in a similar reduction in payments from private payors. The implementation of cost containment measures or other
healthcare reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our products.

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 FDA regulations, guidance or interpretations will be
changed, or what the impact of such changes on the marketing approvals, if any, of our product candidates may be. In addition, increased scrutiny by the
U.S. 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 conditions and other requirements.

We are subject to anti-corruption laws, as well as export control laws, customs laws, sanctions laws and other laws governing our operations. If we fail
to comply with these laws, we could be subject to civil or criminal penalties, other remedial measures and legal expenses, which could adversely affect
its business, results of operations and financial condition.

Our operations are subject to anti-corruption laws, including the Foreign Corrupt Practices Act, or FCPA, and other anti-corruption laws that apply in
countries where we do business and may do business in the future. The FCPA and these other laws generally prohibit us, our officers and employees and
intermediaries from bribing, being bribed or making other prohibited payments to government officials or other persons to obtain or retain business or gain
some other business advantage. We may in the future operate in jurisdictions that pose a high risk of potential FCPA violations, and may participate in
collaborations and relationships with third parties whose actions could potentially subject us to liability under the FCPA or local anti-corruption laws. In
addition, we cannot predict the nature, scope or effect of future regulatory requirements to which its international operations might be subject or the manner
in which existing laws might be administered or interpreted.

We are also subject to other laws and regulations governing our international operations, including regulations administered by the U.S. government and
authorities in the European Union or the United Kingdom, including applicable export control

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regulations, economic sanctions on countries and persons, customs requirements and currency exchange regulations, which we collectively refer to as
Trade Control Laws.

There is no assurance that we will be completely effective in ensuring our compliance with all applicable anti-corruption laws, including the FCPA or other
legal requirements, including Trade Control Laws. If we are not in compliance with the FCPA and other anti-corruption laws or Trade Control Laws, we
may be subject to criminal and civil penalties, disgorgement and other sanctions and remedial measures, and legal expenses, which could have an adverse
impact on our business, financial condition, results of operations and liquidity. Likewise, any investigation of any potential violations of the FCPA, other
anti-corruption laws or Trade Control Laws by U.S. or other authorities could also have an adverse impact on our reputation, business, results of operations
and financial condition.

If, in the future, we are unable to establish sales and marketing capabilities or to selectively enter into agreements with third parties to sell and market
our product candidates, we may not be successful in commercializing our product candidates if and when they are approved.

We do not have a sales or marketing infrastructure and have no experience in the sale, marketing or distribution of pharmaceutical products. To achieve
commercial success for any approved product for which we retain sales and marketing responsibilities, we must either develop a sales and marketing
organization or outsource these functions to other third parties. In the future, we may choose to build a focused sales and marketing infrastructure to sell
some of our product candidates if and when they are approved.

There are risks involved both with establishing our own sales and marketing capabilities and with entering into arrangements with third parties to perform
these services. For example, recruiting and training a sales force is expensive and 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 capabilities is delayed or does not occur for any reason, we would
have prematurely or unnecessarily incurred these commercialization expenses. This may be costly, and our investment would be lost if we cannot retain or
reposition our sales and marketing personnel.

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

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

•

the inability of sales personnel to obtain access to physicians or educate adequate numbers of physicians on the benefits of prescribing
any future products; and

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

If we enter into arrangements with third parties to perform sales, marketing and distribution services, our product revenue or the profitability of these
product revenue to us may be lower than if we were to market and sell any products that we develop ourselves. In addition, we may not be successful in
entering into arrangements with third parties to sell and market our product candidates or may be unable to do so on terms that are favorable to us. We may
have little control over such third parties, and any of them may 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.

We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we
do.

The development and commercialization of new drug products is highly competitive. We face competition with respect to our current product candidates,
and will face competition with respect to any product candidates that we may seek to develop or commercialize in the future, from major pharmaceutical
companies, specialty pharmaceutical companies and biotechnology companies worldwide. There are a number of large pharmaceutical and biotechnology
companies that currently market and sell products or are pursuing the development of products for the treatment of cancer, such as ccRCC. Some of these
competitive products and therapies are based on scientific approaches that are the same as or similar to our approach and others are based on entirely
different approaches. Potential competitors also include academic institutions, government agencies and other public and private research organizations that
conduct research, seek patent protection and establish collaborative arrangements for research, development, manufacturing and commercialization.

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Our lead product candidate, mavorixafor, is in clinical development for the treatment of WHIM syndrome, SCN and WM, respectively. We are aware of
other companies that are developing CXCR4 inhibitors that are in a similar stage of development as mavorixafor, including Eli Lilly, Pfizer, Bristol-Myers
Squibb, or BMS, BioLineRx, Noxxon, Upsher-Smith, Polyphor and Glycomimetics. To our knowledge, there do not appear to be any competitors with
programs in development for WHIM syndrome or SCN. With respect to WM, the Dana Farber Cancer Institute has completed enrollment for a trial to
study the BMS CXCR4 antibody (IV infusion) in the treatment of WM patients with CXCR4 mutations. In WM, there are several treatment approaches
currently being developed, including targeted therapies and immunotherapies (as monotherapies and combination therapies), chemotherapy, stem cell
transplantation, and cancer vaccines. With the exception of the BMS monoclonal antibody, none to our knowledge have a mechanism of action that
interacts with the CXCR4 receptor.

There are a variety of available drug therapies marketed for cancer. In many cases, these drugs are administered in combination to enhance efficacy. Some
of the currently approved drug therapies are branded and subject to patent protection, and others are available on a generic basis. Many of these approved
drugs are well-established therapies and are widely accepted by physicians, patients and third-party payors. Insurers and other third-party payors may also
encourage the use of generic products. We expect that if our product candidates are approved, they will be priced at a significant premium over competitive
generic products. This may make it difficult for us to achieve our business strategy of using our product candidates in combination with existing therapies
or replacing existing therapies with our product candidates.

Our competitors may develop products that are more effective, have a better safety profile, are more convenient or less costly than any that we are
developing or that would render our product candidates obsolete or non-competitive. Our competitors may also obtain marketing approval from the FDA or
other regulatory authorities for their products sooner than we may obtain approval for our product candidates, which could result in our competitors
establishing a strong market position before we are able to enter the market.

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 may 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.

We intend to market mavorixafor and our other product candidates outside of the United States, and if we do, we will be subject to the risks of doing
business outside of the United States.

Because we intend to market mavorixafor and other product candidates, if approved, outside of the United States, our business is subject to risks associated
with doing business outside of the United States. Accordingly, our business and financial results in the future could be adversely affected due to a variety of
factors, including:

•

•

failure to develop an international sales, marketing and distribution system for our products;

changes in a specific country’s or region’s political and cultural climate or economic condition;

• unexpected changes in foreign laws and regulatory requirements;

• difficulty of effective enforcement of contractual provisions in local jurisdictions;

•

•

•

•

•

inadequate intellectual property protection in foreign countries;

inadequate data protection against unfair commercial use;

trade-protection measures, import or export licensing requirements such as Export Administration Regulations promulgated by the
United States Department of Commerce and fines, penalties or suspension or revocation of export privileges;

the effects of applicable foreign tax structures and potentially adverse tax consequences; and

significant adverse changes in foreign currency exchange rates.

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Even if we are able to commercialize mavorixafor or any other product candidate that we develop, the product may become subject to unfavorable
pricing regulations, third-party reimbursement practices or healthcare reform initiatives, which would harm our business.

The laws and regulations that govern marketing approvals, pricing, coverage and reimbursement for new drug products vary widely from country to
country. Current and future legislation may significantly change the approval requirements in ways that could involve additional costs and cause delays in
obtaining approvals. 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 and, in some 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, and negatively impact the revenues 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.

Our ability to commercialize mavorixafor or any other product candidate successfully also will depend in part on the extent to which coverage and
adequate reimbursement for these products and related treatments will be available from government health administration authorities, private health
insurers and other organizations. Government authorities and other third-party payors, such as private health insurers and health maintenance organizations,
decide which medications they will pay for and establish reimbursement levels. A primary trend in the U.S. and E.U. healthcare industries and elsewhere is
cost containment. Government authorities and other third-party payors have attempted to control costs by limiting coverage and the amount of
reimbursement for particular medications. Increasingly, third-party payors are requiring that drug companies provide them with predetermined discounts
from list prices and are challenging the prices charged for medical products. We cannot be sure that coverage and reimbursement will be available for
mavorixafor or any other product that we commercialize and, if coverage and reimbursement is available, the level of reimbursement. Reimbursement may
impact the demand for, or the price of, any product candidate for which we obtain marketing approval. Obtaining and maintaining adequate reimbursement
for mavorixafor may be particularly difficult because of the higher prices typically associated with drugs directed at smaller populations of patients. In
addition, third-party payors are likely to impose strict requirements for reimbursement of a higher priced drug, and any launch of a competitive product is
likely to create downward pressure on the price initially charged. If reimbursement is not available or is available only to a limited degree, we may not be
able to successfully commercialize any product candidate for which we obtain marketing approval.

There may be significant delays in obtaining coverage and reimbursement for newly approved drugs, and coverage may be more limited than the purposes
for which the drug is approved by the applicable regulatory authority. Moreover, eligibility for coverage and reimbursement does not imply that any drug
will be paid for in all cases or at a rate that covers our costs, including research, development, intellectual property, manufacturing, sale and distribution
expenses. Interim reimbursement levels for new drugs, if applicable, may also not be sufficient to cover our costs and may not be made permanent.
Reimbursement rates may vary according to the use of the drug and the clinical setting in which it is used, may be based on reimbursement levels already
set for lower cost drugs, and may be incorporated into existing payments for other services. Net prices for drugs may be reduced by mandatory discounts or
rebates required by government healthcare programs or private payors and by any future relaxation of laws that presently restrict imports of drugs 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. In the European Union, reference pricing systems and other measures may lead
to cost containment and reduced prices. Our inability to promptly obtain coverage and adequate reimbursement rates from both government-funded and
private payors for any approved products that we develop could have a material adverse effect on our operating results, our ability to raise capital needed to
develop product candidates and commercialize products and our overall financial condition.

Governments outside the United States tend to impose strict price controls, which may adversely affect our revenues, if any.

In some countries, particularly the countries of the European Union, the pricing of prescription pharmaceuticals is subject to governmental control. In these
countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain
reimbursement or pricing approval in some countries, we may be required to conduct a clinical trial that compares the cost-effectiveness of our product
candidate to other available therapies. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory
levels, our business could be harmed, possibly materially.

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Product liability lawsuits against us could cause us to incur substantial liabilities and could limit the commercialization of any product candidates we
may develop.

We face an inherent risk of product liability exposure related to the testing of our product candidates in human clinical trials and will face an even greater
risk with respect to commercial sales of any products that we may develop. If we cannot successfully defend ourselves against claims that our product
candidates or products caused injuries, we could incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:

•

reduced resources of our management to pursue our business strategy;

• decreased demand for any products that we may develop;

•

injury to our reputation and significant negative media attention;

• withdrawal of clinical trial participants;

•

•

•

•

•

significant costs to defend any related litigation;

substantial monetary awards to trial participants or patients;

loss of revenue;

increased insurance costs; and

the inability to commercialize any products that we may develop.

Although we maintain clinical trial insurance coverage, it may not be adequate to cover all liabilities that we may incur. We anticipate that we will need to
increase our insurance coverage as we continue clinical trials or begin commercialization of any products. Insurance coverage is increasingly expensive.
We may not be able to obtain or maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise.

Risks Related to Our Dependence on Third Parties

We have minimal experience manufacturing our product candidates on a large clinical or commercial scale and have no manufacturing facility. We
are currently dependent on a single third party manufacturer for the manufacture of mavorixafor, the active pharmaceutical ingredient, or API, and a
single manufacturer of mavorixafor finished drug product capsules. If we experience problems with these third parties, the manufacturing of
mavorixafor could be delayed, which could harm our results of operations.

We do not own or operate facilities for the manufacture of mavorixafor or any other product candidate. We currently have no plans to build our own clinical
or commercial scale manufacturing capabilities. We currently work exclusively with one manufacturer for the production of mavorixafor, the active
pharmaceutical ingredient, or API, and a single manufacturer of mavorixafor finished drug product capsules. To meet our projected needs for clinical
supplies to support our activities through regulatory approval and commercial manufacturing, the manufacturer with whom we currently work will need to
increase its frequency and/or scale of production or we will need to find additional or alternative manufacturers. We have not yet secured alternate suppliers
in the event the current manufacturer we utilize is unable to meet demand, or if otherwise we experience any problems with them. If such problems arise
and we are unable to arrange for alternative third-party manufacturing sources, we are unable to find an alternative third party capable of reproducing the
existing manufacturing method or we are unable to do so on commercially reasonable terms or in a timely manner, we may not be able to complete
development of our product candidates, or market or distribute them.

Reliance on third-party manufacturers entails risks to which we would not be subject if we manufactured our product candidates ourselves, including
reliance on the third party for regulatory compliance and quality assurance, the possibility of breach of the manufacturing agreement by the third party
because of factors beyond our control (including a failure to synthesize and manufacture our product candidates or any products that we may eventually
commercialize in accordance with our specifications), and the possibility of termination or nonrenewal of the agreement by the third party, based on its own
business priorities, at a time that is costly or damaging to us. In addition, the FDA and other regulatory authorities require that our product candidates and
any products that we may eventually commercialize be manufactured according to cGMP and similar foreign standards. 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 for compliance with

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cGMP requirements. Changes to the manufacturing process are strictly regulated and often require prior FDA or other regulatory authority approval before
being implemented. FDA requirements also require investigation and correction of any deviations from cGMP and impose reporting and documentation
requirements upon us and any third-party manufacturers that we may decide to use. Accordingly, the manufacturers must continue to expend time, money
and effort in the areas of production and quality control to maintain cGMP compliance. Any failure by our third-party manufacturers to comply with cGMP
or failure to scale up manufacturing processes, including any failure to deliver sufficient quantities of product candidates or products if they are approved in
a timely manner, could lead to a delay in, or failure to obtain, regulatory approval of any of our product candidates. In addition, such failure could be the
basis for the FDA to issue a warning letter, withdraw approvals for product candidates previously granted to us, or take other regulatory or legal action,
including recall or seizure, total or partial suspension of production, suspension of ongoing clinical trials, refusal to approve pending applications or
supplemental applications, detention of product, refusal to permit the import or export of products, injunction, or imposing civil and criminal penalties.

Our current manufacturer and any future manufacturers may not be able to manufacture our product candidates at a cost or in quantities or in a timely
manner necessary to make commercially successful products. If we successfully commercialize any of our product candidates, we may be required to
establish large-scale commercial manufacturing capabilities. In addition, as our drug development pipeline increases and matures, we will have a greater
need for clinical study and commercial manufacturing capacity. We have no experience manufacturing pharmaceutical products on a commercial scale and
some of these manufacturers will need to increase their scale of production to meet our projected needs for commercial manufacturing, the satisfaction of
which may not be met on a timely basis.

We rely on third-party CROs to conduct our preclinical studies and clinical trials. If these CROs do not successfully carry out their contractual duties
or meet expected deadlines, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business could be
substantially harmed.

We have relied upon and plan to continue to rely upon third-party contract research organizations, or CROs, and clinical data management organizations to
monitor and manage data for our ongoing preclinical and clinical programs. Although we control only certain aspects of their activities, we are responsible
for ensuring that each of our studies is conducted in accordance with the applicable protocol and legal, regulatory and scientific standards, and our reliance
on the CROs does not relieve us of our regulatory responsibilities. We also rely on third parties to conduct our preclinical studies in accordance with Good
Laboratory Practice, or GLP, requirements and the Laboratory Animal Welfare Act of 1966 requirements. We, our CROs and our clinical trial sites are
required to comply with regulations and current Good Clinical Practices, or GCP, and comparable foreign requirements to ensure that the health, safety and
rights of patients are protected in clinical trials, and that data integrity is assured. Regulatory authorities ensure compliance with GCP requirements through
periodic inspections of trial sponsors and trial sites. If we, any of our CROs or our clinical trial sites fail to comply with applicable GCP requirements, the
clinical data generated in our clinical trials or a specific site may be deemed unreliable and the FDA or comparable foreign regulatory authorities may
require us to perform additional clinical trials before approving our marketing applications.

Our CROs are not our employees, and except for remedies available to us under our agreements with such CROs, we cannot control whether or not they
devote sufficient time and resources to our ongoing clinical and preclinical programs. If CROs do not successfully carry out their contractual obligations or
meet expected timelines or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical protocols,
regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to obtain regulatory
approval for or successfully commercialize our product candidates. As a result, our results of operations and the commercial prospects for our product
candidates would be harmed, our costs could increase and our ability to generate revenues could be delayed.

Disruptions in our supply chain could delay the commercial launch of our product candidates.

Any significant disruption in our supplier relationships could harm our business. We currently rely on a single source supplier of mavorixafor, as well a
single supplier for the finished product capsules for mavorixafor. If either of these single source suppliers suffers a major natural or man-made disaster at
its manufacturing facility, we would not be able to manufacture mavorixafor on a commercial scale until a qualified alternative supplier is identified.
Although alternative sources of supply exist, the number of third party suppliers with the necessary manufacturing and regulatory expertise and facilities is
limited, and it could be expensive and take a significant amount of time to arrange for alternative suppliers. Any significant delay in the supply of a product
candidate or its key materials for an ongoing clinical study could considerably delay completion of our clinical studies, product testing and potential
regulatory approval of our product candidates. If we or our manufacturers are unable to purchase these key

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materials after regulatory approval has been obtained for our product candidates, the commercial launch of our product candidates would be delayed, which
would impair our ability to generate revenues from the sale of our product candidates.

Our employees, principal investigators, CROs and consultants may engage in misconduct or other improper activities, including noncompliance with
regulatory standards and requirements, which could have a material adverse effect on our business.

We are exposed to the risk that our employees, principal investigators, CROs and consultants may engage in fraudulent conduct or other illegal activity.
Misconduct by these parties could include intentional failures to comply with FDA regulations or similar regulations of comparable foreign regulatory
authorities, to provide accurate information to the FDA or comparable foreign regulatory authorities, to comply with manufacturing standards we have
established, to comply with federal and state healthcare fraud and abuse laws and regulations and similar laws and regulations established and enforced by
comparable foreign regulatory authorities, to report financial information or data accurately or to disclose unauthorized activities to us. In particular, 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. Employee or third party misconduct could also involve the improper use
of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation. It is not always
possible to identify and deter employee misconduct, and the precautions we take to detect and prevent this activity, such as employee training, 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. 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 and results of operations, including the imposition of
significant fines or other sanctions.

We have established, and may seek to selectively establish in the future, collaborations, and, if we are unable to establish them on commercially
reasonable terms, we may have to alter our development and commercialization plans.

Our drug development programs and the potential commercialization of our product candidates will require substantial additional cash to fund expenses.
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.

We face significant competition in seeking appropriate collaborators. 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 the design or results of clinical trials, the likelihood of approval by the FDA or
similar regulatory authorities outside the United States, the potential market for the subject product candidate, the costs and complexities of manufacturing
and delivering such product candidate to patients, the potential of competing products, the existence of uncertainty with respect to our ownership of
technology, which can exist if there is a challenge to such ownership without regard to the merits of the challenge and industry and market conditions
generally. The collaborator may also consider alternative product candidates for similar indications that may be available to collaborate on and whether
such a collaboration could be more attractive than the one with us for our product candidates.

Future development and potential commercialization of mavorixafor in ccRCC will be pursued only as part of a potential strategic collaboration. In
addition, we have entered into an agreement with Abbisko Therapeutics to develop and commercialize mavorixafor, in combination with checkpoint
inhibitors or other agents in Greater China for oncology indications. No assurance can be given, however, that any current or future strategic collaboration
will prove to be successful.

Collaborations are complex and time-consuming to negotiate and document. 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 decide to expand or modify one or our existing collaboration agreements or to collaborate with a new third party in connection with any of our
development programs or product candidates, we may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we are
unable to do so, we may have to curtail the development program or the product candidate for which we are seeking to collaborate, reduce or delay our
development program or one or more of our other development programs, delay our potential commercialization or reduce the scope of any sales or
marketing activities, or increase

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our expenditures and undertake development or commercialization activities at our own expense. If we elect to increase our expenditures to fund
development or commercialization activities on our own, we may need to obtain additional capital, which may not be available to us on acceptable terms or
at all. If we do not have sufficient funds, we may not be able to further develop our product candidates or bring them to market and generate product
revenue.

We may depend on such collaborations for the development and commercialization of our product candidates. If those collaborations are not
successful, we may not be able to capitalize on the market potential of our product candidates.

We have, and may selectively seek in the future, third-party collaborators for the development and commercialization of our product candidates. Our likely
collaborators for any collaboration arrangements include large and mid-size pharmaceutical companies, regional and national pharmaceutical companies
and biotechnology companies. If we enter into any such arrangements with any third parties, we will likely have limited control over the amount and timing
of resources that our collaborators dedicate to the development or commercialization of our product candidates. 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.

Collaborations involving our product candidates pose many risks to us, including that:

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•

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

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 collaborator’s strategic focus or available
funding or external factors such as an acquisition that diverts resources or creates 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;

collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our
product candidates or products if the collaborators believe that competitive products are more likely to be successfully developed or
can be commercialized under terms that are more economically attractive than ours;

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

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 proprietary information or expose us to potential litigation;

disputes may arise between the collaborators and us that result in the delay or termination of the research, development or
commercialization of our product candidates or products or that result in costly litigation or arbitration that diverts management
attention and resources;

• we may lose certain valuable rights under circumstances identified in our collaborations if we undergo a change of control;

•

•

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; and

collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at
all. In addition, if a future collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis on
our product development or commercialization program under such collaboration could be delayed, diminished or terminated.

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We may engage in future acquisitions or in-licenses of technology that could disrupt our business, cause dilution to our stockholders and harm our
financial condition and operating results.

While we currently have no specific plans to acquire any other businesses or in-license any additional products or technology, we may, in the future, make
acquisitions or licenses of, or investments in, companies, products or technologies that we believe are a strategic or commercial fit with our current product
candidates and business or otherwise offer opportunities for us. In connection with these acquisitions or investments, we may:

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•

issue stock that would dilute our stockholders’ percentage of ownership;

expend cash;

incur debt and assume liabilities; and

incur amortization expenses related to intangible assets or incur large and immediate write-offs.

We also may be unable to find suitable acquisition or license candidates and we may not be able to complete acquisitions or licenses on favorable terms, if
at all. If we do complete an acquisition or license, we cannot assure you that it will ultimately strengthen our competitive position or that it will not be
viewed negatively by customers, financial markets or investors. Further, the Merger poses, and future acquisitions or licenses could also pose, numerous
additional risks to our operations, including:

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•

problems integrating the purchased or licensed business, products or technologies;

increases to our expenses

the failure to have discovered undisclosed liabilities of the acquired or licensed asset or company;

diversion of management’s attention from their day-to-day responsibilities;

harm to our operating results or financial condition;

 entrance into markets in which we have limited or no prior experience; and

potential loss of key employees, particularly those of the acquired entity.

We may not be able to complete one or more acquisitions or effectively integrate the operations, products or personnel gained through any such acquisition
without a material adverse effect on our business, financial condition and results of operations.

Risks Related to Our Intellectual Property

Recent laws and rulings by U.S. courts make it difficult to predict how patents will be issued or enforced in our industry.

Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may have a significant impact on our ability to
protect our technology and enforce our intellectual property rights.

There have been numerous recent changes to the patent laws and to the rules of the United States Patent and Trademark Office, or USPTO, which may have
a significant impact on our ability to protect our technology and enforce our intellectual property rights. For example, the Leahy-Smith America Invents
Act, or AIA, which was signed into law in 2011, includes a transition from a “first-to-invent” system to a “first-to-file” system, and changes the way issued
patents are challenged. Certain changes, such as the institution of inter partes review proceedings, that allow third parties to challenge newly issued patents,
came into effect on September 16, 2012. The burden of proof required for challenging a patent in these proceedings is lower than in district court litigation,
and patents in the biologics and pharmaceuticals industry have been successfully challenged using these new post-grant challenges. In addition, the U.S.
Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in specified circumstances or
weakening the rights of patent owners in specified situations. Depending on decisions by the U.S. Congress, the federal courts, and the USPTO, these
substantive changes to patent law associated with the AIA may further weaken our ability to obtain new patents or to enforce our existing patents and
patents that we might obtain in the future, all of which could harm our business.

Furthermore, the patent positions of companies engaged in the development and commercialization of biologics and pharmaceuticals are particularly
uncertain. Two cases involving diagnostic method claims and “gene patents” have recently been decided by the Supreme Court. On March 20, 2012, the
Supreme Court issued a decision in Mayo Collaborative Services v. Prometheus Laboratories, Inc., or Prometheus, a case involving patent claims directed
to measuring a metabolic product in a

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patient to optimize a drug dosage amount for the patient. According to the Supreme Court, the addition of well-understood, routine or conventional activity
such as “administering” or “determining” steps was not enough to transform an otherwise patent ineligible natural phenomenon into patent eligible subject
matter. On July 3, 2012, the USPTO issued guidance indicating that process claims directed to a law of nature, a natural phenomenon or an abstract idea
that do not include additional elements or steps that integrate the natural principle into the claimed invention such that the natural principle is practically
applied and the claim amounts to significantly more than the natural principle itself should be rejected as directed to non-statutory subject matter. On June
13, 2013, the Supreme Court issued its decision in Association for Molecular Pathology v. Myriad Genetics, Inc., or Myriad, a case involving patent claims
held by Myriad Genetics, Inc. relating to the breast cancer susceptibility genes BRCA1 and BRCA2. Myriad held that isolated segments of naturally
occurring DNA, such as the DNA constituting the BRCA1 and BRCA2 genes, is not patent eligible subject matter, but that complementary DNA, which is
an artificial construct that may be created from RNA transcripts of genes, may be patent eligible.

We cannot assure you that our efforts to seek patent protection for our technology and products will not be negatively impacted by the changes described
above, future rulings in district court cases or changes in guidance or procedures issued by the USPTO. We cannot fully predict what impact the Supreme
Court’s decisions may have on the ability of life science companies to obtain or enforce patents relating to their products and technologies in the future.

Moreover, although the Supreme Court has held in Myriad that isolated segments of naturally occurring DNA are not patent-eligible subject matter, certain
third parties could allege that activities that we may undertake infringe other gene-related patent claims, and we may deem it necessary to defend ourselves
against these claims by asserting non-infringement and/or invalidity positions, or pay to obtain a license to these claims. In any of the foregoing or in other
situations involving third-party intellectual property rights, if we are unsuccessful in defending against claims of patent infringement, we could be forced to
pay damages or be subjected to an injunction that would prevent us from utilizing the patented subject matter. Such outcomes could harm our business.

If we are unable to protect our intellectual property rights, our competitive position could be harmed.

We depend on our ability to protect our proprietary technology. We rely on trade secret, patent, copyright and trademark laws, and confidentiality, licensing
and other agreements with employees and third parties, all of which offer only limited protection. 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 technology and products. Where we have the right to
do so under our license agreements, we seek to protect our proprietary position by filing patent applications in the United States and abroad related to our
novel technologies and products that are important to our business.

The patent positions of biotechnology and pharmaceutical companies generally are highly uncertain, involve complex legal and factual questions and have
in recent years been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patents, including
those patent rights licensed to us by third parties, are highly uncertain.

The steps we have taken to police and protect our proprietary rights may not be adequate to preclude misappropriation of our proprietary information or
infringement of our intellectual property rights, both inside and outside the United States. The rights already granted under any of our currently issued
patents and those that may be granted under future issued patents may not provide us with the proprietary protection or competitive advantages that we are
seeking. If we are unable to obtain and maintain patent protection for our technology and products, or if the scope of the patent protection obtained is not
sufficient, our competitors could develop and commercialize technology and products similar or superior to ours, and our ability to successfully
commercialize our technology and products may be adversely affected.

With respect to patent rights, we do not know whether any of the pending patent applications for any of our product candidates will result in the issuance of
patents that protect our technology or products, or which will effectively prevent others from commercializing competitive technologies and products. Our
pending applications cannot be enforced against third parties practicing the technology claimed in such applications unless and until a patent issues from
such applications. Further, the examination process may require us or our licensors to narrow the claims, which may limit the scope of patent protection
that may be obtained. Although our license agreement with Genzyme includes a number of issued patents that are exclusively licensed to us, the issuance of
a patent is not conclusive as to its inventorship, scope, validity or enforceability, issued patents that we own or have licensed from third parties may be
challenged in the courts or patent offices in the United States and abroad. Such challenges may result in the loss of patent protection, the narrowing of
claims in such patents, or the invalidity or unenforceability of such

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patents, 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 for our technology and products. Protecting against the unauthorized use of our patented technology, trademarks and other intellectual
property rights is expensive, difficult and may, in some cases, not be possible. In some cases, it may be difficult or impossible to detect third party
infringement or misappropriation of our intellectual property rights, even in relation to issued patent claims, and proving any such infringement may be
even more difficult.

We could be required to incur significant expenses to obtain our intellectual property rights, and we cannot ensure that we will obtain meaningful
patent protection for our product candidates.

The patent prosecution process is expensive and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent
applications at a reasonable cost or in a timely manner. In addition, it is also possible that we will fail to identify patentable aspects of further inventions
made in the course of our development and commercialization activities before they are publicly disclosed, making it too late to obtain patent protection on
them. Further, 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 expect to seek extensions of patent terms where these are available
in any countries where we are prosecuting patents. This includes in the United States under the Drug Price Competition and Patent Term Restoration Act of
1984, which permits a patent term extension of up to five years beyond the expiration of a patent that covers an approved product where the permission for
the commercial marketing or use of the product is the first permitted commercial marketing or use, and as long as the remaining term of the patent does not
exceed 14 years. However, the applicable authorities, including the FDA in the United States, and any equivalent regulatory authority in other countries,
may not agree with our assessment of whether such extensions are available, and may refuse to grant extensions to our patents, or may grant more limited
extensions than we request. If this occurs, our competitors may be able to take advantage of our investment in development and clinical trials by
referencing our clinical and preclinical data and launch their product earlier than might otherwise be the case. 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 as the laws of the United States, and these foreign laws may also be subject to
change. 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 or our licensors
were the first to make the inventions claimed in our owned or licensed patents or pending patent applications, or that we or our licensors were the first to
file for patent protection of such inventions.

In March 2013, the United States transitioned to a ‘first to file’ system in which the first inventor to file a patent application will be entitled to the patent.
Third parties are allowed to submit prior art prior to the issuance of a patent by the USPTO and may become involved in post-grant review or derivation
proceedings for applications filed on or after March 16, 2013, interference proceedings for applications filed before March 16, 2013, ex parte
reexamination, or inter partes review 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, which could adversely affect our competitive position with respect to
third parties.

Obtaining and maintaining our patent protection depends on compliance with various procedural, documentary, fee payment and other requirements
imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these requirements.

Periodic maintenance fees on any issued patent are due to be paid to the USPTO, and foreign patent agencies in several stages over the lifetime of the
patent. The USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and
other requirements during the patent application process. While an inadvertent lapse can in many cases be cured by payment of a late fee or by other means
in accordance with the applicable rules, there are situations in which noncompliance can result in abandonment or lapse of the patent or patent application,
resulting in partial or complete loss of patent rights in the relevant jurisdiction. Non-compliance events that could result in abandonment or lapse of a patent
or patent application include, but are not limited to, failure to respond to official actions within prescribed time limits, non-payment of fees and failure to
properly legalize and submit formal documents. If we or our licensors fail to maintain the patents and patent applications covering our product candidates,
our competitors might be able to enter the market, which would have a material adverse effect on our business.

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Patent terms may be inadequate to protect our competitive position on our product candidates for an adequate amount of time.

Patents have a limited lifespan. In the United States, if all maintenance fees are timely paid, the natural expiration of a patent is generally 20 years from its
earliest U.S. non-provisional filing date. Various extensions may be available, but the life of a patent, and the protection it affords, is limited. Even if
patents covering our product candidates are obtained, once the patent life has expired, we may be open to competition from competitive products, including
generics or biosimilars. 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. As a result, our owned and licensed patent portfolio may not
provide us with sufficient rights to exclude others from commercializing products similar or identical to ours.

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

In addition to the possibility of litigation relating to infringement claims asserted against it, we may become a party to other patent litigation and other
proceedings, including inter partes review proceedings, post-grant review proceedings, derivation proceedings declared by the USPTO and similar
proceedings in foreign countries, regarding intellectual property rights with respect to our current or future technologies or product candidates or products.
The cost to us of any patent litigation or other proceeding, even if resolved in our favor, could be substantial. Some of our competitors may be able to
sustain the costs of such litigation or proceedings more effectively than we can because of their substantially greater financial resources. Patent litigation
and other proceedings may also absorb significant management time. Uncertainties resulting from the initiation and continuation of patent litigation or
other proceedings could impair our ability to compete in the marketplace.

Competitors may infringe or otherwise violate our intellectual property, including patents that may issue to or be licensed by us. As a result, we may be
required to file claims in an effort to stop third-party infringement or unauthorized use. Any such claims could provoke these parties to assert counterclaims
against us, including claims alleging that we infringe their patents or other intellectual property rights. This can be prohibitively expensive, particularly for
a company of our size, and time-consuming, and even if we are successful, any award of monetary damages or other remedy we may receive may not be
commercially valuable. In addition, in an infringement proceeding, a court may decide that our asserted intellectual property is not valid or is
unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our intellectual property does not cover its
technology. An adverse determination in any litigation or defense proceedings could put our intellectual property at risk of being invalidated or interpreted
narrowly and could put our patent applications at risk of not issuing.

If the breadth or strength of our patent or other intellectual property rights is compromised or threatened, it could allow third parties to commercialize our
technology or products or result in our inability to commercialize our technology and products without infringing third-party intellectual property rights.
Further, third parties may be dissuaded from collaborating with us.

Interference or derivation proceedings brought by the USPTO or its foreign counterparts may be necessary to determine the priority of inventions with
respect to our patent applications, and we may also become involved in other proceedings, such as re-examination proceedings, before the USPTO or its
foreign counterparts. Due to the substantial competition in the pharmaceutical space, the number of such proceedings may increase. This could delay the
prosecution of our pending patent applications or impact the validity and enforceability of any future patents that we may obtain. In addition, any such
litigation, submission or proceeding may be resolved adversely to us and, even if successful, may result in substantial costs and distraction to our
management.

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 this type of litigation. Moreover, intellectual property law relating to the fields in
which we operate is still evolving and, consequently, patent and other intellectual property positions in our industry are subject to change and are often
uncertain. We may not prevail in any of these suits or other efforts to protect our technology, and the damages or other remedies awarded, if any, may not
be commercially valuable. During the course of this type of litigation, there could be public announcements of the results of hearings, motions or other
interim proceedings or developments. If securities analysts or investors perceive these results to be negative, the market price for our common stock could
be significantly harmed.

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If we fail to comply with our obligations in the agreements under which we license intellectual property rights from third parties or otherwise
experience disruptions to our business relationships with our licensors, we could lose intellectual property rights that are important to our business.

We are a party to several license agreements and may need to obtain additional licenses from others to advance our research and development activities or
allow the commercialization of our current product candidates and any that we may identify and pursue in the future. Our currently license agreements
impose, and we expect that future license agreements will impose, various development, diligence, commercialization, and other obligations on us. In spite
of our efforts, our licensors might conclude that we have materially breached our obligations under such license agreements and might therefore terminate
the license agreements, thereby removing or limiting our ability to develop and commercialize products and technology covered by these license
agreements. If these in-licenses are terminated, or if the underlying patents fail to provide the intended exclusivity, competitors or other third parties may
gain the freedom to seek regulatory approval of, and to market, products identical to ours and we may be required to cease our development and
commercialization of our product candidates. Any of the foregoing could have a material adverse effect on our competitive position, business, financial
conditions, results of operations, and prospects.

Moreover, disputes may arise regarding intellectual property subject to a licensing agreement, including:

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the scope of rights granted under the license agreement and other interpretation-related issues;

the extent to which our product candidates, technology and processes infringe on intellectual property of the licensor that is not
subject to the licensing agreement;

the sublicensing of patent and other rights under our collaborative development relationships;

our diligence obligations under the license agreement and what activities satisfy those diligence obligations;

the inventorship and ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our
licensors and us and our partners; and

the priority of invention of patented technology.

In addition, the agreements under which we currently license intellectual property or technology from third parties are complex, and certain provisions in
such agreements may be susceptible to multiple interpretations. The resolution of any contract interpretation disagreement that may arise could narrow
what we believe to be the scope of our rights to the relevant intellectual property or technology, or increase what we believe to be our financial or other
obligations under the relevant agreement, either of which could have a material adverse effect on our business, financial condition, results of operations,
and prospects. Moreover, if disputes over intellectual property that we have licensed prevent or impair our ability to maintain our current licensing
arrangements on commercially acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates, which
could have a material adverse effect on our business, financial conditions, results of operations, and prospects.

From time to time, we may need to rely on licenses to proprietary technologies, which may be difficult or expensive to obtain or we may lose certain
licenses which may be difficult to replace.

We may need to obtain licenses to patents and other proprietary rights held by third parties to develop, manufacture and market our product candidates. If
we are unable to timely obtain these licenses on commercially reasonable terms and maintain these licenses, our ability to commercially market our product
candidates may be inhibited or prevented, which could have a material adverse effect on our business, results of operations, financial condition and cash
flows.

Third parties may initiate legal proceedings alleging that we are infringing their intellectual property rights, the outcome of which would be uncertain
and could have a material adverse effect on the success of our business.

Our commercial success depends upon our ability to develop, manufacture, market and sell our product candidates, and to use our proprietary technologies
without infringing the proprietary rights of third parties. We may become party to, or threatened with, future adversarial proceedings or litigation regarding
intellectual property rights with respect to our products and technology, including interference and various post grant proceedings before the USPTO, non-
U.S. opposition proceedings, and German nullity proceedings. Third parties may assert infringement claims against us based on existing patents or patents
that may be granted in the future.

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As a result of any such infringement claims, or to avoid potential claims, we may choose or be compelled to seek intellectual property licenses from third
parties. These licenses may not be available on acceptable terms, or at all. Even if we are able to obtain a license, the license would likely obligate us to pay
license fees or royalties or both, and the rights granted to us likely would be nonexclusive, which would mean that our competitors also could obtain
licenses to the same intellectual property. Ultimately, we could be prevented from commercializing a product candidate or technology or be forced to cease
some aspect of our business operations if, as a result of actual or threatened infringement claims, we are unable to enter into licenses of the relevant
intellectual property on acceptable terms. Further, if we attempt to modify a product candidate or technology or to develop alternative methods or products
in response to infringement claims or to avoid potential claims, we could incur substantial costs, encounter delays in product introductions or interruptions
in sales. Ultimately, such efforts could be unsuccessful.

Parties making claims against us may obtain injunctive or other equitable relief, which could effectively block our ability to further develop and
commercialize our product candidates that we may identify. Defense of these claims, regardless of their merit, would involve substantial litigation expense
and would be a substantial diversion of employee resources from our business. In the event of a successful claim of infringement against us, we may have
to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, pay royalties, redesign our infringing products or obtain
one or more licenses from third parties, which may be impossible or require substantial time and monetary expenditure.

Parties making claims against us may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially
greater resources. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation or administrative
proceedings, there is a risk that some of our confidential information could be compromised by disclosure. In addition, any uncertainties resulting from the
initiation and continuation of any litigation could have material adverse effect on our ability to raise additional funds or otherwise have a material adverse
effect on our business, results of operations, financial condition and prospects.

Intellectual property litigation could cause us to spend substantial resources and distract our personnel from their normal responsibilities.

Litigation or other legal proceedings relating to intellectual property claims, with or without merit, is unpredictable and generally expensive and time
consuming and is likely to divert significant resources from our core business, including distracting our technical and management personnel from their
normal responsibilities. 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 this type of litigation. In addition, there could be public
announcements of the results of hearings, motions or other interim proceedings or developments and if securities analysts or investors perceive these results
to be negative, it could have a substantial adverse effect on the price of our common stock and negatively impact our ability to raise additional funds. Such
litigation or proceedings could substantially increase our operating losses and reduce the resources available for development activities or any future sales,
marketing or distribution activities.

We may not have sufficient financial or other resources to adequately conduct such litigation or proceedings. Some of our competitors may be able to
sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources and more mature and developed
intellectual property portfolios. Accordingly, despite our efforts, we may not be able to prevent third parties from infringing upon or misappropriating or
from successfully challenging our intellectual property rights. Uncertainties resulting from the initiation and continuation of patent litigation or other
proceedings could have a material adverse effect on our ability to compete in the marketplace.

Our trade secrets are difficult to protect and if we are unable to protect the confidentiality of our trade secrets, our business and competitive position
would be harmed.

In addition to seeking patents for some of our technologies and product candidates, we also rely on trade secrets, including unpatented know-how,
technology and other proprietary information, to maintain our 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 employees, corporate collaborators, outside scientific
collaborators, contract manufacturers, consultants, advisors and other third parties. We also enter into confidentiality, non-competition, non-solicitation, and
invention assignment agreements with our employees and consultants that obligate them to assign to us any inventions developed in the course of their
work for us. However, we cannot guarantee that we have executed these agreements with each party that may have or have had access to our trade secrets
or that the agreements we have executed will provide adequate protection. Despite these efforts, any of these parties

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may breach the agreements and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for
such breaches. As a result, we may be forced to bring claims against third parties, or defend claims that they bring against us, to determine ownership of
what we regard as our intellectual property. Monitoring unauthorized disclosure is difficult and we do not know whether the procedures that we have
followed to prevent such disclosure are or will be adequate. 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, some courts inside and outside the United States may be less willing or
unwilling to protect trade secrets. If any of the technology or information that we protect as trade secrets were to be lawfully obtained or independently
developed by a competitor, we would have no right to prevent them 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 competitive position would be harmed.

We may be subject to claims that our employees have wrongfully used or disclosed alleged trade secrets of their former employers.

Our employees, including members of our senior management, were previously employed at other biotechnology or pharmaceutical companies, including
our competitors or potential competitors. All such individuals, including each member of our senior management, executed proprietary rights, non-
disclosure and non-competition agreements in connection with such previous employment. Although we try to ensure that our employees do not use the
proprietary information or know-how of others in their work for us, we may be subject to claims that we or these employees have used or disclosed
intellectual property, including trade secrets or other proprietary information, of any such employee’s former employer. We are not aware of any threatened
or pending claims related to these matters or concerning the agreements with our senior management, but in the future litigation may be necessary to
defend against such claims. If we fail in 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 defending against such claims, litigation could result in substantial costs and be a distraction to
management.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on all of our product candidates throughout the world would be prohibitively expensive. In general, we have
sought patent protection of our intellectual property in the following jurisdictions: US, Canada, China, Japan and in countries within Europe via the
European Patent Office. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products
and further, may export otherwise infringing products to territories where we have patent protection, but where enforcement is not as strong as that in the
United States. These products may compete with our products in jurisdictions where we do not have any issued patents and our patent claims or other
intellectual property rights may not be effective or sufficient to prevent them from so competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems
of certain countries, particularly certain developing countries, do not favor the enforcement of patents and other intellectual property protection, particularly
those relating to biopharmaceuticals, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in
violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial cost and divert our
efforts and attention from other aspects of our business.

Risks Related to the Regulatory Approval, Marketing and Commercialization of Our Product Candidates

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we will not be able to commercialize, or will be delayed in
commercializing, our product candidates, and our ability to generate revenue will be 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 authorities in other countries. Failure to obtain marketing approval for a product
candidate will prevent us from commercializing the product candidate. We have not received approval to market any of our product candidates from
regulatory authorities in any jurisdiction. Securing regulatory approval requires the submission of extensive preclinical and clinical data and supporting
information to the various regulatory authorities for each therapeutic indication to establish the product candidate’s safety and efficacy. Securing regulatory
approval also requires the submission of information about the product manufacturing process to, and inspection of

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manufacturing facilities by, the relevant regulatory authority. Our product candidates may not be effective, may be only moderately effective or may prove
to have undesirable or unintended side effects, toxicities or other characteristics that may preclude us from obtaining marketing approval or prevent or limit
commercial use.

The process of obtaining marketing approvals, both in the United States and elsewhere, is expensive, may take many years and can vary substantially based
upon a variety of factors, including the type, complexity and novelty of the product candidates involved. We cannot assure you that we will ever obtain any
marketing approvals in any jurisdiction. Changes in marketing approval requirements during the development period, changes in or the enactment of
additional statutes or regulations or changes in regulatory review for each submitted product application may cause delays in the approval or rejection of an
application. The FDA and comparable authorities in other countries have substantial discretion in the review and approval process and may refuse to accept
any application or may decide that our data is insufficient for approval and require additional nonclinical or other studies, and clinical trials. In addition,
varying interpretations of the data obtained from preclinical testing and clinical trials could delay, limit or prevent marketing approval of a product
candidate. Additionally, any marketing approval that we ultimately may obtain may be limited or subject to restrictions or post-approval commitments that
render the approved product not commercially viable.

Failure to obtain regulatory approval in international jurisdictions would prevent our product candidates from being marketed abroad.

In order to market and sell our products in the European Union and many other jurisdictions, we must obtain separate marketing approvals and comply with
numerous and varying regulatory requirements. The regulatory review and approval process outside the United States generally includes all of the risks
associated with obtaining FDA approval, but can involve additional testing and clinical trial requirements and in-country regulatory and/or legal
representation. We may need to partner with third parties in order to obtain approvals outside the United States. In addition, in many countries worldwide, 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, if at all. 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. We may not be able to file for marketing approvals and may not receive necessary approvals to commercialize our
products in any market. If we are unable to obtain approval of mavorixafor or any other product candidate by regulatory authorities in the European Union
or other countries, the commercial potential of those product candidates may be significantly diminished and our business prospects could decline.

A Breakthrough Therapy Designation By The FDA For Our Product Candidates May Not Lead To A Faster Development Or Regulatory Review Or
Approval Process, And It Does Not Increase The Likelihood That Our Product Candidates Will Receive Marketing Approval.

We have obtained breakthrough therapy designation for mavorixafor for the treatment of adult patients with WHIM and we may pursue that designation for
other product candidates as well. A breakthrough therapy is defined as a product that is intended, alone or in combination with one or more other drugs, to
treat a serious or life- threatening condition, and preliminary clinical evidence indicates that the product may demonstrate substantial improvement over
existing therapies on one or more clinically significant endpoints. For product candidates that have been designated as breakthrough therapies, interaction
and communication between the FDA and the sponsor of the trial can help identify the most efficient path for clinical development while minimizing the
number of patients placed in ineffective control regimens. Such designation also offers an intensive and efficient review involving FDA senior managers
and experienced review and regulatory health project management staff across disciplines. A breakthrough therapy designation affords the possibility of
rolling review, enabling the FDA to review portions of our marketing application before submission of a complete application, and possibly, priority
review.

Designation as a breakthrough therapy is within the discretion of the FDA. Accordingly, even if we believe that our product candidates meet the criteria for
designation as a breakthrough therapy, the FDA may disagree and instead determine not to make such designation. In any event, the receipt of a
breakthrough therapy designation for a product candidate may not result in a faster development process, review or approval compared to products
considered for approval under conventional FDA procedures and does not assure ultimate approval by the FDA. In addition, even if one or more of our
product candidates qualify as breakthrough therapies, the FDA may later decide that the products no longer meet the conditions for qualification.

It is possible that we may not be able to obtain or maintain orphan drug designation or exclusivity for our drug candidates.

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Regulatory authorities in some jurisdictions, including the United States and Europe, may designate drugs for the treatment or prevention of rare diseases
or conditions with relatively small patient populations as orphan drugs. Under the Orphan Drug Act of 1983, or the Orphan Drug Act, the FDA may
designate a product as an orphan drug if it is a drug intended to treat a rare disease or condition, which is defined as a patient population of fewer than
200,000 individuals in the United States. We received orphan drug designation from the FDA for mavorixafor for the treatment of WHIM syndrome in
October 2018, and from the EMA in July 2019. If a product with an orphan drug designation subsequently receives the first marketing approval for the
indication for which it has such designation, the product is entitled to a seven-year period of marketing exclusivity, which precludes the FDA from
approving another marketing application for the same drug for the same indication during that time period with some exceptions. A similar provision in the
European Union allows 10 years of exclusivity in Europe. The European exclusivity period can be reduced to six years if a drug no longer meets the criteria
for orphan drug designation or if the drug is sufficiently profitable so that marketing exclusivity is no longer justified. Orphan drug exclusivity may be lost
in both the U.S. and Europe under certain situations, such as the inability of the holder of the orphan drug designation to produce sufficient quantities of the
drug to meet the needs of patients with the rare disease or condition or for certain other reasons.

Even if our product candidates receive regulatory approval, they may still face future development and regulatory difficulties and any approved
products will be subject to extensive post-approval regulatory requirements.

If we obtain regulatory approval for a product candidate, it would be subject to extensive ongoing requirements by the FDA and comparable foreign
regulatory authorities governing the manufacture, quality control, further development, labeling, packaging, storage, distribution, safety surveillance,
import, export, advertising, promotion, recordkeeping and reporting of safety and other post-market information. The safety profile and efficacy of any
product will continue to be closely monitored by the FDA and comparable foreign regulatory authorities after approval. If the FDA or comparable foreign
regulatory authorities become aware of new safety information after approval of any of our product candidates, these regulatory authorities may require
labeling changes or the FDA may require establishment of a Risk Evaluation Mitigation Strategy, or REMS, or similar strategy, impose significant
restrictions on a product’s indicated uses or marketing, impose ongoing requirements for potentially costly post-approval studies or post-market
surveillance. Progress reports are required at quarterly intervals, every six months and at annual intervals depending upon the country, and more frequently
if serious adverse events occur.

In addition, manufacturers of drugs and their facilities are subject to continual review and periodic inspections by the FDA and other regulatory authorities
for compliance with cGMP regulations. 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, a regulatory agency may impose restrictions on that
product, the manufacturing facility or us, including requiring recall or withdrawal of the product from the market or suspension of manufacturing. If we,
our product candidates or the manufacturing facilities for our product candidates fail to comply with cGMPs and other applicable regulatory requirements,
the FDA may, among other things:

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issue warning letters;

request modifications to promotional materials or require us to provide corrective information to healthcare practitioners;

require us to enter into a consent decree, which can include imposition of various fines, reimbursements for inspection costs,
required due dates for specific actions and penalties for noncompliance;

seek an injunction or impose civil or criminal penalties or monetary fines;

suspend or withdraw regulatory approval;

suspend any ongoing clinical trials;

refuse to approve pending applications or supplements to applications filed by us;

suspend or impose restrictions on operations, including costly new manufacturing requirements; or

seize or detain products, refuse to permit the import or export of products, or require us to initiate a product recall.

The occurrence of any event or penalty described above may inhibit our ability to commercialize our products and generate revenue.

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Any product candidate for which we obtain marketing approval could be subject to marketing 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 products.

Any product candidate for which we obtain marketing approval will be subject to continual requirements of and review by the FDA and other regulatory
authorities. These requirements include submissions of safety and other post-marketing information and reports, registration and listing requirements,
cGMP requirements, quality assurance and corresponding maintenance of records and documents and requirements regarding the distribution of samples to
physicians and recordkeeping. 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 or to the conditions of approval, or contain requirements for costly post-marketing testing and surveillance to
monitor the safety or efficacy of the medicine. The FDA closely regulates the post-approval marketing and promotion of drugs to ensure that they are
marketed only for the approved indications and in accordance with the provisions of the approved labeling. The FDA imposes stringent restrictions on
manufacturers’ communications regarding off-label use and if we do not market our products for their approved indications, we may be subject to
enforcement action for off-label marketing and/or promotion.

In addition, later discovery of previously unknown problems with our products, manufacturers or manufacturing processes, or failure to comply with
regulatory requirements, may result in, among other things:

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restrictions on such products, manufacturers or manufacturing processes;

restrictions on the labeling, marketing, distribution or use of a product;

requirements to conduct post-approval clinical trials;

• warning or untitled letters;

• withdrawal of the products from the market;

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refusal to approve pending applications or supplements to approved applications that we submit;

recall of products;

fines, restitution or disgorgement of profits or revenue;

suspension or withdrawal of marketing approvals;

refusal to permit the import or export of our products;

product seizure; and

injunctions or the imposition of civil or criminal penalties.

Risks Related to Our Business Operations, Employee Matters and Managing Growth

We currently have a limited number of employees and our future success depends on our ability to retain our executive officers and to attract, retain
and motivate qualified personnel.

Because of the specialized scientific and managerial nature of our business, we rely heavily on our ability to attract and retain qualified scientific, technical
and managerial personnel. We are highly dependent upon members of our current management team, including Paula Ragan, Ph.D., our Chief Executive
Officer, the loss of whose services may adversely impact the achievement of our objectives. Although we have an employment agreement with Dr. Ragan,
this agreement is at-will and does not prevent her from terminating her employment with us at any time by providing the requisite advance notice.

Our success will depend on our ability to retain our management team and other key employees, and to attract and retain qualified personnel in the future.
The loss of the services of certain members of our senior management or key employees could prevent or delay the implementation and completion of our
strategic objectives, or divert management’s attention to seeking qualified replacements The competition for qualified personnel in the pharmaceutical field
is intense and we cannot guarantee that we will be able to retain our current personnel or attract and retain new qualified personnel
necessary for the development of our business or to recruit suitable replacement personnel.

We will need to grow the size of our organization, and we may experience difficulties in managing this growth.

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As of December 31, 2019, we had 58 full-time employees. As our development and commercialization plans and strategies develop, or as a result of any
future acquisitions, we will need additional managerial, operational, development, sales, marketing, financial and other resources. Our management,
personnel and systems currently in place will not be adequate to support this future growth. Future growth would impose significant added responsibilities
on our employees, including:

• managing our clinical trials effectively;

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identifying, recruiting, maintaining, motivating and integrating additional employees;

• managing our internal development efforts effectively while complying with our contractual obligations to licensors, contractors and

other third parties;

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improving our managerial, development, operational and finance systems; and

expanding our facilities.

As our operations expand, we will need to manage additional relationships with various strategic collaborators, suppliers and other third parties. Our future
financial performance and our ability to commercialize our product candidates and to compete effectively will depend, in part, on our ability to manage any
future growth effectively. To that end, we must be able to manage our development efforts and clinical trials effectively and hire, train and integrate
additional management, administrative, research and development, and sales and marketing personnel. We may not be able to accomplish these tasks, and
our failure to accomplish any of them could prevent us from successfully growing the company.

The pharmaceutical industry is highly competitive and is subject to rapid and significant technological change, which could render our technologies
and products obsolete or uncompetitive.

The pharmaceutical industry is highly competitive and is subject to rapid and significant technological change, which could render certain of our products
obsolete or uncompetitive. This is particularly true in the development of therapeutics for oncology indications where new products and combinations of
products are rapidly being developed that change the treatment paradigm for patients. There is no assurance that our product candidates will be the best,
have the best safety profile, be the first to market, or be the most economical to make or use. The introduction of competitive therapies as alternatives to our
product candidates could dramatically reduce the value of those development projects or chances of successfully commercializing those product candidates,
which could have a material adverse effect on our long-term financial success.

We will compete with companies in the United States and internationally, including major pharmaceutical and chemical companies, specialized CROs,
research and development firms, universities and other research institutions. Many of our competitors have greater financial resources and selling and
marketing capabilities, greater experience in clinical testing and human clinical trials of pharmaceutical products and greater experience in obtaining FDA
and other regulatory approvals than we do. In addition, some of our competitors may have lower development and manufacturing costs.

We rely significantly on information technology and any failure, inadequacy, interruption or security lapse of that technology or loss of data, including
any cyber security incidents, could compromise sensitive information related to our business, prevent us from accessing critical information or expose
us to liability which could harm our ability to operate our business effectively and adversely affect our business and reputation.

In the ordinary course of our business, we, our contract research organizations and other third parties on which we rely collect and store sensitive data,
including legally protected patient health information, personally identifiable information about our employees, intellectual property, and proprietary
business information. We manage and maintain our applications and data utilizing on-site systems. These applications and data encompass a wide variety
of business-critical information including research and development information and business and financial information.

The secure processing, storage, maintenance and transmission of this critical information is vital to our operations and business strategy. Despite the
implementation of security measures, our internal computer systems and those of third parties with which we contract are vulnerable to damage from
cyber-attacks, computer viruses, breaches, unauthorized access, interruptions due to employee error or malfeasance or other disruptions, or damage from
natural disasters, terrorism, war and telecommunication and electrical failures. Any such event could compromise our networks and the information stored
there could be accessed by unauthorized parties, publicly disclosed, lost or stolen. We have measures in place that are designed to detect and respond to
such security incidents and breaches of privacy and security mandates. Any such access, disclosure or other loss of information could

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result in legal claims or proceedings, liability under laws that protect the privacy of personal information, government enforcement actions and regulatory
penalties. Unauthorized access, loss or dissemination could also disrupt our operations, including our ability to conduct research, development and
commercialization activities, process and prepare company financial information, manage various general and administrative aspects of our business and
damage our reputation, in addition to possibly requiring substantial expenditures of resources to remedy, any of which could adversely affect our business.
The loss of clinical trial data could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. In
addition, there can be no assurance that we will promptly detect any such disruption or security breach, if at all. To the extent that any disruption or security
breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could
incur liability and our research, development and commercialization efforts could be delayed.

Business disruptions could seriously harm our future revenues and financial condition and increase our costs and expenses.

Our operations could be subject to earthquakes, power shortages, telecommunications failures, water shortages, floods, hurricanes, typhoons, fires, extreme
weather conditions, medical epidemics (including but not limited to the novel coronavirus) and other natural or man-made disasters or business
interruptions, for which we are predominantly self-insured. The occurrence of any of these business disruptions could seriously harm our operations and
financial condition and increase our costs and expenses. We rely on a single third-party manufacturer to provide the active pharmaceutical ingredient for
mavorixafor and a single third-party manufacturer to provide fill and finish services for the final drug product formulation of mavorixafor for use in clinical
trials. Our ability to obtain clinical supplies of product candidates could be disrupted if the operations of these suppliers are affected by a man-made or
natural disaster or other business interruption.

The novel coronavirus outbreak could impact our business.

In December 2019, a novel strain of coronavirus was first reported in China. This virus has now spread to numerous other countries, including the United
States and Austria. While we do not currently have significant operations in geographical locations where the coronavirus is currently reported to be most
prevalent, we have clinical trial sites either currently approved or pending approval in Italy and South Korea, two of the countries where the coronavirus
has demonstrated increased prevalence. We cannot reasonably estimate at this time the impact, if any, that the coronavirus may have on our business or
operations in these countries or otherwise. The extent to which the coronavirus impacts our business will depend on future developments, which are highly
uncertain and cannot be predicted, including new information which may emerge concerning the severity of the coronavirus and the actions to contain the
coronavirus or treat its impact, including on financial markets or otherwise.

Our ability to use our net operating losses to offset future taxable income may be subject to certain limitations.

In general, under Section 382 of the Internal Revenue Code of 1986, as amended, or the Code, a corporation that undergoes an “ownership change” is
subject to limitations on its ability to utilize its carryforwards to offset future taxable income. Our existing net operating loss carryforwards, or NOLs, may
be subject to limitations arising from previous ownership changes, including in connection with the Merger, and if we undergo a subsequent ownership
change, our ability to utilize NOLs could be further limited by Section 382 of the Code. There is also a risk that due to regulatory changes, such as
suspensions on the use of NOLs, or other unforeseen reasons, our existing and any future NOLs could expire or otherwise be unavailable to offset future
income tax liabilities.

We have not conducted a study to assess whether an ownership change has occurred or whether there have been multiple ownership changes since
inception due to the significant complexity and cost associated with such a study.

Our term loan contains restrictions that limit our flexibility in operating our business.

In October 2018, we entered into a loan and security agreement with Hercules Capital, Inc., secured by a lien on substantially all of our assets, including
intellectual property. This loan contains various covenants that limit our ability to engage in specified types of transactions. These covenants limit our
ability to, among other things:

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sell, transfer, lease or dispose of certain assets;

incur indebtedness;

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encumber or permit liens on certain assets;

• make certain investments;

• make certain restricted payments, including paying dividends on, or repurchasing or making distributions with respect to, our

common stock; and

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enter into certain transactions with affiliates.

The covenants also include maintaining a minimum liquidity amount of the lesser of (i) 125% of outstanding borrowings under the Hercules Loan
Agreement and (ii) 100% of our cash and cash equivalents in an account in which Hercules has a first priority security interest. A breach of any of the
covenants under the loan and security agreement could result in a default under the loan. Upon the occurrence of an event of default under the loan, the
lenders could elect to declare all amounts outstanding, if any, to be immediately due and payable and terminate all commitments to extend further credit. If
there are any amounts outstanding that we are unable to repay, the lenders could proceed against the collateral granted to them to secure such indebtedness.

We will incur costs and demands upon management as a result of complying with the laws and regulations affecting public companies.

We will incur significant legal, accounting and other expenses that we did not incur as a private company, including costs associated with public company
reporting requirements. We will also incur costs associated with corporate governance requirements, including requirements under the Sarbanes-Oxley Act,
as well as rules implemented by the Securities and Exchange Commission, or SEC and Nasdaq. These rules and regulations are expected to increase our
legal and financial compliance costs and to make some activities more time consuming and costly. Our executive officers and other personnel will need to
devote substantial time regarding operations as a public company and compliance with applicable laws and regulations. These rules and regulations may
also make it difficult and expensive for us to obtain and maintain directors’ and officers’ liability insurance. We have not purchased any key man insurance
policies with respect to our executive officers. As a result, it may be more difficult for us to attract and retain qualified individuals to serve on our board of
directors or as our executive officers, which may adversely affect investor confidence in us and could cause our business or stock price to suffer.

The impact of the Tax Cuts and Jobs Act on our financial results is not entirely clear and could differ materially from the financial statements included
in this Annual Report.

The “Tax Cuts and Jobs Act,” or the TCJA, which was enacted in 2017, significantly reforms the U.S. Tax Code. The TCJA, among other things, contained
significant changes to corporate taxation, including reduction of the corporate tax rate from a top marginal rate of 35% to a flat rate of 21%, limitations on
the deduction of NOL carryforwards and the elimination of NOL carrybacks, in each case, for losses generated after December 31, 2017 (though any such
NOLs may be carried forward indefinitely), limitations on deductions for interest expense and modifications or repeal of many business deductions and
credits. Our consolidated financial statements included elsewhere in this Annual Report reflect the effects of the TCJA based on current guidance.
However, there remain uncertainties and ambiguities in the application of certain provisions of the TCJA and, as a result, we made certain judgments and
assumptions in the interpretation thereof. The U.S. Treasury Department and the Internal Revenue Service, or the IRS, may issue further guidance on how
the provisions of the TCJA will be applied or otherwise administered that differs from our current interpretation. In addition, the TCJA could be subject to
potential amendments and technical corrections, any of which could materially lessen or increase certain adverse impacts of the legislation on us.

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 new products and services 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 may rely, 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, the
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 U.S.

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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 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, 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 Our Common Stock

Our stock price is expected to continue to be volatile.

The market price of our common stock could continue to be subject to significant fluctuations. Market prices for securities of early-stage pharmaceutical,
biotechnology and other life sciences companies have historically been particularly volatile. Some of the factors that may cause the market price of our
common stock to fluctuate include:

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our ability or the ability of our collaborators to develop product candidates and conduct clinical trials that demonstrate such product
candidates are safe and effective;

our ability or the ability of our collaborators to obtain regulatory approvals for product candidates, and delays or failures to obtain
such approvals;

failure of any our product candidates to demonstrate safety and efficacy, receive regulatory approval and achieve commercial
success;

failure to maintain our existing third-party license, manufacturing and supply agreements;

failure by us or our licensors to prosecute, maintain or enforce our intellectual property rights;

changes in laws or regulations applicable to our current or future product candidates;

any inability to obtain adequate supply of product candidates or the inability to do so at acceptable prices;

adverse decisions by regulatory authorities;

introduction of new or competing products by our competitors;

failure to meet or exceed financial and development projections that we may provide to the public;

the perception of the pharmaceutical industry by the public, legislatures, regulators and the investment community;

announcements of significant acquisitions, strategic collaborations, joint ventures or capital commitments by us or our competitors;

disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain intellectual
property protection for our technologies;

additions or departures of key personnel;

significant lawsuits, including intellectual property or stockholder litigation;

announcements by us of material developments in our business, financial condition and/or operations;

if securities or industry analysts do not publish research or reports about us, or if they issue an adverse or misleading opinions
regarding our business and stock;

changes in the market valuations of similar companies;

general market or macroeconomic conditions;

sales of our common stock or our stockholders in the future;

trading volume of our common stock;

adverse publicity relating to our markets generally, including with respect to other products and potential products in such markets;

changes in the structure of health care payment systems; and

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•

period-to-period fluctuations in our financial results.

Moreover, the stock markets in general have experienced substantial volatility that has often been unrelated to the operating performance of individual
companies. These broad market fluctuations may also adversely affect the trading price of our common stock.

In the past, following periods of volatility in the market price of a company’s securities, stockholders have often instituted class action securities litigation
against those companies. Such litigation, if instituted, could result in substantial costs and diversion of management attention and resources, which could
significantly harm our business, financial condition, results of operations and reputation.

We will be required to raise additional funds to finance our operations; we may not be able to do so when necessary, and/or on acceptable terms.

Our ongoing capital requirements will depend on numerous factors related to the development of our product candidates and the sale of products obtaining
regulatory approval, including: the progress and cost of research and development programs and clinical trials; the progress and cost of research and
development programs of collaborators; the time and costs expended and required to obtain any necessary or desired regulatory approvals; the costs of
ongoing compliance with the FDA and other domestic and foreign regulatory agency requirements; the resources devoted to manufacturing expenditures;
the ability to enter into licensing arrangements; the cost of commercialization activities and arrangements, if any, undertaken by us; and, if and when
approved, the demand for our products.

We anticipate that we will need to raise additional funds through public or private financings, strategic collaborations or other arrangements. Additional
equity financing would be dilutive to our existing stockholders, and debt financing, if available, may involve restrictive covenants. If we raise funds
through collaborative or licensing arrangements, we may be required to relinquish, on terms that are not favorable to us, rights to some of our technologies
or product candidates that we would otherwise seek to develop or commercialize. Our failure to raise capital when needed could materially harm our
business, financial condition and results of operations.

We expect to be heavily reliant on our ability to access funding through capital market transactions. Due to our small public float, market
capitalization, limited operating history and lack of revenue, it may be difficult and expensive for us to raise additional funds.

We anticipate that we will be heavily reliant on our ability to raise funds through the issuance of shares of our common stock or securities linked to our
common stock. Our ability to raise these funds may be dependent on a number of factors, including the low trading volume and volatile trading price of our
shares of common stock and other risk factors described herein. The stocks of small cap companies in the biotechnology sector like us tend to be highly
volatile. We expect that the price of our common stock will be highly volatile for the next several years. Even if we expand our portfolio of product
candidates, we may never successfully commercialize or monetize our current product candidate or any future product candidate that we may seek to
develop.

As a result, we may be unable to access funding through sales of our common stock or other equity-linked securities. Even if we were able to access
funding, the cost of capital may be substantial due to our low market cap and our small public float. The terms of any funding we are able to obtain may not
be favorable to us and may be highly dilutive to our stockholders. We may be unable to access capital due to unfavorable market conditions or other market
factors outside of our control. There can be no assurance that we will be able to raise additional capital when needed. The failure to obtain additional capital
when needed would have a material adverse effect on our business.

Raising additional funds by issuing securities may cause dilution to existing stockholders and raising funds through lending and licensing
arrangements may restrict our operations or require us to relinquish proprietary rights.

Until such time, if ever, as we can generate substantial product revenues, we expect to finance our cash needs through a combination of equity offerings,
debt financings, grants and license and development agreements in connection with any collaborations. We do not have any committed external source of
funds. To the extent that we raise additional capital by issuing equity securities, our existing stockholders’ ownership will be diluted, and the terms of these
securities may include liquidation or other preferences that adversely affect your rights as a common stockholder. Debt financing and preferred equity
financing, if

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available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt,
making 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. Any debt financing that we enter into may involve covenants that restrict our operations. These restrictive covenants may include
limitations on additional borrowing and specific restrictions on the use of our assets as well as prohibitions on our ability to create liens, pay dividends,
redeem our stock or make investments. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to
delay, limit, reduce or terminate our 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.

We are an “emerging growth company,” and a "smaller reporting company" and as a result of the reduced disclosure requirements applicable to
emerging growth companies and smaller reporting companies, our common stock may be less attractive to investors.

We are an “emerging growth company,” or EGC, as defined in the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and may remain an
emerging growth company until December 31, 2022. For so long as we remain an EGC, 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 in the assessment of our internal control over financial
reporting;

not being required to comply with any requirement that may be adopted by the Public Company Accounting Oversight Board
regarding a supplement to the auditor’s report providing additional information about the audit and the financial statements;

reduced disclosure obligations regarding executive compensation; and

exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of
any golden parachute payments not previously approved.

Investors may find our common stock less attractive as a result of our reliance 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.

Even following the termination of our status as an emerging growth company, we will be able to take advantage of the reduced disclosure requirements
applicable to smaller reporting companies (as that term is defined in Rule 12b-2 of the Exchange Act) and, in particular, reduced disclosure obligations
regarding executive compensation in our periodic reports and proxy statements. To the extent that we are no longer eligible to use exemptions from various
reporting requirements, we may be unable to realize our anticipated cost savings from these exemptions, which could have a material adverse impact on our
operating results.

If securities analysts do not publish research or reports about our business or if they publish negative evaluations of our stock, the price of our stock
could decline.

The trading market for our common stock will be influenced, in part, on the research and reports that industry or financial analysts publish about us or our
business. Equity research analysts may elect not to provide research coverage of our common stock, and such lack of research coverage may adversely
affect the market price of our common stock. In the event we do have equity research analyst coverage, we will not have any control over the analysts or
the content and opinions included in their reports. The price of our common stock could decline if one or more equity research analysts downgrade our
stock or issue other unfavorable commentary or research. If one or more equity research analysts ceases coverage of us or fails to publish reports on us
regularly, demand for our common stock could decrease, which in turn could cause our stock price or trading volume to decline.

We do not anticipate that we will pay any cash dividends in the foreseeable future.

The current expectation is that we will retain our future earnings to fund the development and growth of our business. In addition, the terms of our debt
agreements may preclude us from paying dividends. As a result, capital appreciation, if any, of our common

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stock will be your sole source of gain, if any, for the foreseeable future. We are prohibited from declaring or paying any cash dividends under our existing
loan and security agreement with Hercules Capital, Inc.

Sales of a substantial number of shares of our common stock in the public market could cause our stock price to decline.

Sales of a substantial number of shares of our common stock in the public market, or the perception that these sales might occur, could depress the market
price of our common stock and could impair our ability to raise capital through the sale of additional equity securities. We are unable to predict the effect
that sales, particularly sales by our directors, executive officers, and significant stockholders, may have on the prevailing market price of our common
stock.

In addition, we have filed registration statements on Form S-8 registering the issuance of shares of common stock subject to options or other equity awards
issued or reserved for future issuance under our equity incentive plans. Shares registered under these registration statements are available for sale in the
public market subject to vesting arrangements and exercise of options, as well as Rule 144 in the case of our affiliates.

Additionally, a holder of our common stock has rights, subject to some conditions, to require us to file one or more registration statements covering their
shares. These registration rights will terminate upon the earlier to occur of November 17, 2020 or the date on which the holder has sold all shares subject to
such registration rights. If we were to register the resale of these shares, they could be freely sold in the public market. If these additional shares are sold, or
if it is perceived that they will be sold, in the public market, the trading price of our common stock could decline.

If we fail to maintain an effective system of internal control over financial reporting, we may not be able to accurately report our financial results or
prevent fraud. As a result, stockholders could lose confidence in our financial and other public reporting, which would harm our business and the
trading price of our common stock.

We are subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act of 2002 and the rules and regulations of The Nasdaq Global
Market. Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, or Section 404, we are required to perform system and process evaluation and testing
of our internal control over financial reporting to allow our management to report on the effectiveness of our internal control over financial reporting in this
Form 10-K.

Effective internal control over financial reporting is necessary for us to provide reliable financial reports and, together with adequate disclosure controls
and procedures, is designed to prevent fraud. Any failure to implement required new or improved controls, or difficulties encountered in their
implementation, could cause us to fail to meet our reporting obligations. In addition, any testing by us, as and when required, conducted in connection with
Section 404 of the Sarbanes-Oxley Act, or Section 404, or any subsequent testing by our independent registered public accounting firm, as and when
required, may reveal deficiencies in our internal control over financial reporting that are deemed to be significant deficiencies or material weaknesses or
that may require prospective or retroactive changes to our financial statements or identify other areas for further attention or improvement. Inferior internal
controls could also cause investors to lose confidence in our reported financial information, which could have a negative effect on the trading price of our
common stock.

Pursuant to Section 404, we are required to furnish a report by our management on our internal control over financial reporting beginning with this Annual
Report. However, while we remain an EGC, we will not be required to include an attestation report on internal control over financial reporting issued by
our independent registered public accounting firm. When we cease to be an emerging growth company, we will be required to incur substantial additional
professional fees and internal costs to expand our accounting and finance functions in order to include such attestation report.

We may in the future discover weaknesses in our system of internal financial and accounting controls and procedures that could result in a material
misstatement of our financial statements. Our internal control over financial reporting will not prevent or detect all error and all fraud. A control system, no
matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. Because of
the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not
occur or that all control issues and instances of fraud will be detected. If we identify one or more material weaknesses in our internal controls, investors
could lose confidence in the reliability of our financial statements, the market price of our stock could decline and we could be subject to sanctions or
investigations by The Nasdaq Global Market, the SEC or other regulatory authorities.

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We may become involved in securities class action litigation or shareholder derivative litigation that could divert management’s attention and harm our
business and insurance coverage may not be sufficient to cover all costs and damages.

In the past, securities class action or shareholder derivative litigation has often followed certain significant business transactions, such as the sale of a
business division or announcement of a merger. This risk is especially relevant for us because biopharmaceutical companies have experienced significant
stock price volatility in recent years. We may become involved in this type of litigation in the future, including litigation, if any, that may result in
connection with the recently completed Merger. Litigation often is expensive and diverts management’s attention and resources, which could adversely
affect our business.

Provisions in our corporate charter documents and under Delaware law could make an acquisition of the Company, 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 corporate charter and by-laws may discourage, delay or prevent a merger, acquisition or other change in control of the Company that
stockholders may consider favorable, including transactions in which you might otherwise receive a premium for your shares. These provisions also could
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 not all members of the board are elected at one time;

allow the authorized number of our directors to be changed only by resolution of the board of directors;

limit the manner in which stockholders can remove directors from the board;

establish advance notice requirements for stockholder proposals that can be acted on at stockholder meetings and nominations to the
board of directors;

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 stockholder meetings;

authorize the board of directors to issue preferred stock without stockholder approval, which could be used to institute a shareholder
rights plan, or so-called “poison pill,” that would work to dilute the stock ownership of a potential hostile acquirer, effectively
preventing acquisitions that have not been approved by the board of directors; and

require the approval of the holders of at least 75% of the votes that all our stockholders would be entitled to cast to amend or repeal
certain provisions of our charter 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, which
prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with the Company 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.

Our certificate of incorporation provides that the Court of Chancery of the State of Delaware will be the exclusive forum for substantially all disputes
between the Company and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with the
Company or our directors, officers, employees or stockholders.

Our certificate of incorporation provides that the Court of Chancery of the State of Delaware is the exclusive forum for any derivative action or proceeding
brought on the Company’s behalf, any action asserting a breach of fiduciary duty owed by our directors, officers, other employees or stockholders to the
Company or our stockholders, any action asserting a claim against the Company arising pursuant to the Delaware General Corporation Law or as to which
the Delaware General Corporation Law confers jurisdiction on the Court of Chancery of the State of Delaware, or any action asserting a claim arising
pursuant to our certificate of incorporation or by-laws or governed by the internal affairs doctrine. This provision may limit a stockholder’s ability to bring
a claim in a judicial forum that it finds favorable for disputes with the Company or our directors, officers, employees or stockholders, which may
discourage such lawsuits against the Company and our directors, officers, employees or stockholders.

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Alternatively, if a court were to find this provision in our 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 adversely affect our business and financial condition.

ITEM 1B.  UNRESOLVED STAFF COMMENTS

None.

ITEM 2.  PROPERTIES

We lease approximately 12,577 square feet of office space at 955 Massachusetts Avenue, 4th Floor, Cambridge, Massachusetts, which currently serves as
our corporate headquarters. The lease expires on July 31, 2022, and we have the option to extend the term one time for an additional five-year period. The
base monthly payment on the lease is approximately $68 thousand as of December 31, 2019, subject to specified annual increases of approximately 1.5%
during the term of the lease and not including operating expenses, certain utilities, taxes and insurance for which we are responsible.

On November 11, 2019, we entered into a 7-year lease agreement for approximately 28,000 square feet of office space currently under construction in a
building located at 61 North Beacon Street, Allston, Massachusetts. The lease will replace our current headquarters in 2020. Beginning in May 2020, the
base monthly rent payment on the lease will be approximately $82 thousand, which is subject to scheduled annual increases for the term of the lease, plus
certain operating expenses. We will incur construction costs of approximately $4.8 million to prepare the office space for our use, of which the landlord
will reimburse $1.8 million. We are required to provide the landlord with a $1.1 million security deposit in the form of a letter of credit, which is classified
as long-term restricted cash on our balance sheet as of December 31, 2019. We have the right to sublease the premises, subject to landlord consent and we
have the right to renew the lease for an additional five years at the then prevailing effective market rental rate.

ITEM 3.  LEGAL PROCEEDINGS

From time to time, we may become involved in legal proceedings arising in the ordinary course of our business. We are not currently subject to any
material legal proceedings.

ITEM 4.  MINE SAFETY DISCLOSURES

Not applicable.

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ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF

PART II

EQUITY SECURITIES

Market Information

Our common stock commenced trading on the Nasdaq Global Market under the symbol “ASNS” on November 16, 2017. Prior to that date, there was no
public trading market for our common stock. On March 13, 2019, we completed a business combination in accordance with the terms of the Merger
Agreement, by and among us, X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and the Merger Sub, pursuant to which, among other matters,
Merger Sub merged with and into X4 Therapeutics, Inc., with X4 Therapeutics, Inc. continuing as our wholly-owned subsidiary and the surviving
corporation of the merger. Following the Merger, on March 13, 2019, we effected a 1-for-6 reverse stock split of our common stock and changed our name
to “X4 Pharmaceuticals, Inc.” On March 13 2019, following the completion of the Merger, our common stock began trading on the Nasdaq Global Market
under the symbol “XFOR”.

Holders of Our Common Stock

As of March 6, 2020, there were 52 holders of record of our common stock.

Dividend Policy

We have never declared or paid cash dividends on our common stock. We currently intend to retain all available funds and any future earnings to fund the
development and expansion of our business and we do not anticipate paying any cash dividends 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 then-existing conditions, including our results of
operations, financial condition, contractual restrictions, capital requirements, business prospects and other factors our board of directors may deem relevant.

Recent Sales of Unregistered Securities

None.

Purchase of Equity Securities by the Issuer and Affiliated Purchasers

None.

ITEM 6.  SELECTED FINANCIAL DATA

As a smaller reporting company, we are not required to provide disclosure for this Item.

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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 the related notes and the other financial information included elsewhere in this Annual Report. Some of the information contained in this
discussion and analysis or set forth elsewhere in this Annual Report, including information with respect to our plans and strategy for our business and
related financing, 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, our actual results could differ materially from the results described in or implied by these forward-
looking statements.

For the discussion of the financial condition and results of operations for the year ended December 31, 2018 compared to the year ended December 31,
2017, refer to “Management’s Discussion and Analysis of Financial Condition and Results of Operations" filed as Exhibit 99.1 to our Current Report on
Form 8-K filed with the SEC on August 9, 2019.

Overview

We are a clinical-stage biopharmaceutical company focused on the research, development and commercialization of novel therapeutics for the treatment of
rare diseases. Our pipeline is comprised of potentially first-in-class, oral, small molecule antagonists of chemokine receptor CXCR4, which have the
potential to treat a broad range of rare diseases, including primary immunodeficiencies, or PIs, and certain types of cancer. PIs are a group of more than 250
rare, chronic disorders in which flaws in the immune system cause increased susceptibility to infections and, in some cases, increased risk of cancers.
Within this broad disease classification, a number of PIs are attributed to the improper trafficking of immune cells related to the CXCR4 receptor and its
ligand CXCL12. CXCR4 is stimulated by its only chemokine ligand, CXCL12, and plays a key role in enabling the trafficking of immune cells and
effectively monitoring the function of the immune system, or immunosurveillance. Overstimulation of the CXCL12/CXCR4 pathway leads to inhibition of
the immune response, or immunosuppression.
Our lead product candidate, mavorixafor, is a potentially first-in-class, oral, allosteric antagonist of the CXCR4 receptor designed to correct the abnormal
signaling caused by the receptor/ligand interaction and enable mobilization and trafficking of immune cells. Mavorixafor has completed a Phase 2 clinical
trial in patients with Warts, Hypogammaglobulinemia, Infections, and Myelokathexis, or WHIM, syndrome, which is a rare, inherited primary
immunodeficiency disease. In June 2019, we announced the initiation of 4WHIM, a pivotal, 52-week Phase 3 global clinical trial of mavorixafor for the
treatment of patients with WHIM syndrome. We plan to report top-line data from this trial in the second half of 2021. In November 2019, the FDA granted
Breakthrough Therapy Designation for mavorixafor for the treatment of adults with WHIM. We are also investigating mavorixafor in combination with
axitinib (Inlyta®) in the Phase 2a portion of an open-label Phase 1/2 clinical trial in clear cell renal cell carcinoma, or ccRCC. In September 2019, we
announced positive results from the Phase 2a portion of our open-label Phase 1/2 clinical trial of mavorixafor in combination with axitinib (Inlyta®) in
patients with advanced ccRCC in combination with axitinib, an FDA-approved small molecule tyrosine kinase inhibitor. Future development and potential
commercialization of mavorixafor in ccRCC and other possible immuno-oncology indications will be pursued only as part of a potential strategic
collaboration.

In November 2019, we announced the initiation of a 14-day, proof-of-concept Phase 1b clinical trial of mavorixafor in another PI, severe congenital
neutropenia, or SCN. In December 2019, we announced the initiation of a Phase 1b clinical trial of mavorixafor in Waldenström macroglobulinemia, or
WM. We expect to report initial data from the SCN and WM trials in the second half of 2020.

We are also advancing two early stage candidates towards the clinic: X4P-003, a second-generation CXCR4 antagonist designed to have an enhanced
pharmacokinetic profile relative to mavorixafor, potentially enabling improved patient compliance and ease of use; and X4P-002, a CXCR4 antagonist
designed to cross blood-brain barrier and provide appropriate therapeutic exposures to treat brain cancers.

To date, we have not generated revenue from product sales and do not expect to generate significant revenue from the sale of our 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.

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Our Pipeline:

Results of Operations

Comparison of the Years Ended December 31, 2019 and 2018 

The following table summarizes the results of our operations for the periods indicated:

Year Ended 
December 31,

2019

2018

Change

(in thousands)

Operating expenses:

Research and development

General and administrative

Loss on transfer of nonfinancial assets

Total operating expenses

Loss from operations

Other income (expense):

Interest income

Interest expense

 Change in fair value of preferred stock warrant and derivative liabilities

Loss on extinguishment of debt

Other income

Total other income (expense), net

Net loss

$

30,163   

$

20,346    $

17,640   

3,900   

51,703   

8,739   

—   

29,085   

22,618   

9,817   

8,901   

3,900   

(51,703)  

(29,085)  

(22,618)  

1,197   

(2,147)  

(105)  

(566)  

517   

236   

(720)  

(3,487)  

(229)  

—   

(1,104)  

(4,200)  

961   

(1,427)  

3,382   

(337)  

517   

3,096   

$

(52,807)  

$

(33,285)   $

(19,522)  

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Research and Development Expenses
Research and development expenses consist primarily of costs incurred in connection with the discovery and development of our product candidates,
including employee salaries and related expenses, expenses incurred in connection with the preclinical and clinical development of our product candidates,
including under agreements with third parties, such as consultants and contract research organizations, or CROs; the cost of manufacturing drug products
for use in our preclinical studies and clinical trials, including under agreements with third parties, such as consultants and contract manufacturing
organizations, or CMOs; facilities, depreciation and other expenses, which include direct or allocated expenses for rent and maintenance of facilities and
insurance; costs related to compliance with regulatory requirements; and payments made under third-party licensing agreements. We expense research and
development costs as incurred.

Direct research and development expenses by product candidate:

Mavorixafor (X4P-001)

X4P-002

X4P-003

Unallocated expense

Total research and development expenses

Year Ended
December 31,

2019

2018

Change

(in thousands)

$

16,311    $

10,625    $

5,686   

417   

638   

12,797   

30,163   

$

—   

49   

9,672   

20,346    $

417   

589   

3,125   

9,817   

Research and development expenses were $30.2 million for the year ended December 31, 2019 compared to $20.3 million for the year ended December 31,
2018, reflecting an increase of $9.8 million. The increase in research and development expenses for the year ended December 31, 2019 was primarily due
to a $6.3 million increase in compensation expenses due to additional personnel within our manufacturing, regulatory, program management, and clinical
operations functions as well as compensation expenses related to our research and development facility in Vienna, Austria, which we acquired in the
Merger with Arsanis. These compensation expenses, the majority of which are not allocated to our programs, were partially offset by a decrease of $2.6
million in outside consulting costs as we replaced these outside costs with internal personnel. In addition, research and development expenses increased
approximately $5.8 million due to direct expenses related primarily to our mavorixafor program, including the costs incurred in the current Phase 3 clinical
development stage, and for outsourced services.

We expect that our research and development expenses, particularly for our mavorixafor programs, will increase over the next several years as we continue
to conduct our Phase 3 pivotal trial of mavorixafor in patients with WHIM syndrome, and to conduct our Phase 1b clinical trials of mavorixafor in SCN
and WM.

Research and development expenses related to our X4P-002 and X4P-003 programs were not significant in 2019 relative to our overall research and
development expenses.

General and Administrative Expenses  
General and administrative expenses consist primarily of salaries and related costs, including stock-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.

General and administrative expenses were $17.6 million for the year ended December 31, 2019 compared to $8.7 million for the year ended December 31,
2018, reflecting an increase of $8.9 million. The increase in general and administrative expenses for the year ended December 31, 2019 was primarily due
to an increase in personnel-related costs due to an increase in head count to support the growth of our business, a significant increase in professional fees
associated with becoming a public company, including higher accounting and legal expenses, an increase in insurance and compliance fees, and higher
legal costs incurred in

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connection with our intellectual property portfolio. We expect the growth of general and administrative expenses will slow significantly relative to prior
years, but will continue to grow as we prepare for the commercial launch of mavorixafor.

Loss on Transfer of Nonfinancial Assets
During the year ended December 31, 2019, we entered into contractual arrangements with two third parties that transferred the rights to develop and
commercialize the programs underlying in-process research and development, or IPR&D, intangible assets that we acquired in the merger with Arsanis. As
a result of the transfer of control of the IPR&D projects to third parties, we recorded a charge of $3.9 million to loss on transfer of nonfinancial assets
during 2019. The loss included the carrying value of the IPR&D intangible assets prior to the transfer of control, partially offset by non-refundable, upfront
fees received from the third parties. In accordance with the contractual arrangements with these third parties, we are entitled to future fees that are
contingent on the success of the third parties in advancing the applicable IPR&D projects toward commercialization. There was no such loss in the year
ended December 31, 2018.

Other Income (Expense), Net  

Interest income

Interest expense

Change in fair value of preferred stock warrant and derivative liabilities

Loss on extinguishment of debt

Other income

Total other income (expense), net

Year Ended
December 31,

2019

2018

Change

(in thousands)

$

1,197   

$

236   

$

961   

(2,147)  

(105)  

(566)  

517   

(720)  

(3,487)  

(229)  

—   

(1,427)  

3,382   

(337)  

517   

$

(1,104)  

$

(4,200)  

$

3,096   

The decrease in other income (expense), net, of $3.1 million for the year ended December 31, 2019 as compared to 2018 was primarily due to a decrease in
losses related to the change in the fair value of our preferred stock warrant and derivative liabilities in the year ended December 31, 2019 as compared to
the prior year. Upon the closing of the Merger in March 2019, the preferred stock warrants were converted to warrants for the purchase of shares of
common stock and, therefore, the associated liability was transferred to equity and was no longer adjusted to fair value. In addition, the derivative liability
was adjusted to zero and will no longer be adjusted to fair value following the Merger. Other income (expense) also decreased due to an increase in interest
income, which was due to higher cash equivalent investments during the year ended December 31, 2019 as compared to the prior year. These decreases in
other income (expense), net, were partially offset by a $1.4 million increase in interest expense as a result of our increased borrowings during the year
ended December 31, 2019, primarily related to our Loan and Security Agreement, or the Hercules Loan Agreement, with Hercules Capital, Inc., or
Hercules, and interest expense on loans with Österreichische Forschungsförderungsgesellschaft mbH, or FFG, acquired from Arsanis in March 2019.

Income Taxes   
Since our inception, we have not recorded an income tax benefit for the net losses we have incurred or for our earned research and development tax credits,
as we believe, based upon the weight of available evidence, that it is not more likely than not that these net operating loss carryforwards and tax credits will
be realized as an offset future taxable income. Accordingly, we have recorded a full valuation allowance against our net deferred tax assets at each balance
sheet date.

Liquidity and Capital Resources

Source of Liquidity
Since our inception, we have incurred significant operating losses and negative cash flows from our operations. We have not yet commercialized any
products and we do not expect to generate revenue from sales of any products for several years, if at all. We expect that our research and development and
general and administrative expenses will continue to increase and, as a result, we will need additional capital to fund our future operations, which we may
raise through a combination of equity offerings, debt

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financings, other third-party funding, marketing and distribution arrangements and other collaborations, strategic alliances and licensing arrangements.

We have funded our operations to date primarily with proceeds from sales of common stock, warrants and prefunded warrants for the purchase of our
preferred stock and our common stock, sales of preferred stock, proceeds from the issuance of convertible debt and borrowings under loan and security
agreements. In 2019, we completed a merger with Arsanis and acquired its$26.4 million of cash, cash equivalents and restricted cash. In addition, in 2019,
we raised $139.4 million, net of offering costs, through public offerings of common stock, prefunded warrants to purchase shares of common stock, and
accompanying warrants to purchase shares of common stock. In June 2019, we received $9.8 million in net proceeds as a result of refinancing our Hercules
Loan Agreement, under which, subject to approval by Hercules, an additional $5.0 million is available for borrowing through December 15, 2020 and an
additional term loan of $10.0 million is available through June 15, 2022. Principal payments under the Hercules Loan Agreement commence in February
2022.

As of December 31, 2019, we had cash and cash equivalents of $126.2 million and restricted cash of $1.9 million. We believe that our current liquidity will
be sufficient to meet our projected operating, investing and debt service requirements for at least the next twelve months.

Cash Flows

The following table summarizes our cash flow activities for each of the periods presented:

Year Ended December 31,

2019

2018

(in millions)

2017

Net loss

$

(52.8)   $

(33.3)   $

(22.0)  

Adjustments to reconcile net loss to net cash used in operating activities

Changes in operating assets and liabilities

Net cash used in operating activities

Net cash provided by (used in) investing activities

Net cash provided by financing activities

Impact of foreign exchange on cash and restricted cash

Net increase (decrease) in cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash, beginning of period

Cash, cash equivalents and restricted cash, end of period

7.9   

(3.2)  

(48.1)  

27.2   

140.7   

(0.2)  

119.6   

8.5   

4.7   

3.2   

(25.4)  

—   

6.9   

—   

(18.5)  

27.0   

$

128.1    $

8.5    $

—   

0.7   

(21.3)  

(0.3)  

33.3   

—   

11.7   

15.3   

27.0   

Operating Activities    During the year ended December 31, 2019, net cash used in operating activities was $48.1 million, primarily resulting from our net
losses of $52.8 million, adjusted for noncash expenses of $7.9 million and changes in our operating assets and liabilities of $3.2 million. Noncash expenses
primarily include the derecognition of IPR&D intangible assets included within "loss on transfer of nonfinancial assets" in our consolidated statements of
operations and comprehensive loss and stock-based compensation expense. The change in operating assets and liabilities was primarily due to an increase
in accounts payable due to the growth in our operating activities.

Investing Activities   During the year ended December 31, 2019, net cash provided by investing activities consisted primarily of $26.4 million of cash and
restricted cash acquired in connection with our Merger. There was no comparable net cash provided by or used in investing activities during the same
period in the prior year.

Financing Activities   During the year ended December 31, 2019, net cash provided by financing activities was $140.7 million, consisting primarily of
$139.4 million of net proceeds for the sale in April 2019 and November 2019 of our common stock, warrants and prefunded warrants and net proceeds of
$9.8 million received in our 2019 Loan Agreement with Hercules, partially offset by $9.4 million for the settlement of our FFG loans. During the year
ended December 31, 2018, net cash provided by financing activities was $6.9 million, consisting primarily of net proceeds of $4.4 million from the
issuance of Series B convertible preferred stock and $10.0 million of proceeds from borrowings under the Hercules Loan Agreement, partially offset

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by $6.4 million of repayments of borrowings under our SVB Loan Agreement and $1.1 million for the repurchase of Series Seed convertible preferred
stock pursuant to a stock repurchase agreement we entered into in October 2017.

Loan and Security Agreements
Loan and Security Agreement with Silicon Valley Bank
In October 2016, we entered into a Loan and Security Agreement, or the SVB Loan Agreement, with Silicon Valley Bank, or SVB, which provided for
certain term loans, including a term loan of up to $6.0 million, which we borrowed in June 2017. In October 2018, in connection with entering into the
Hercules Loan Agreement (as described further below), we terminated the SVB Loan Agreement and repaid all amounts due under the SVB Loan
Agreement, including unpaid principal of $4.3 million, a final payment of $0.3 million, a prepayment premium of $87 thousand and accrued interest of
$23 thousand.

Loan and Security Agreement with Hercules Capital, Inc.
In October 2018, we entered into the Hercules Loan Agreement with Hercules. The Hercules Loan Agreement was amended in December 2018 and in June
2019. As of December 31, 2019, the Hercules Loan Agreement, as amended, provides for aggregate maximum borrowings of $35.0 million, of which $20.0
million is outstanding, an additional $5.0 million is available for borrowing through December 15, 2020 and, subject to approval by Hercules, an additional
term loan of $10.0 million is available through June 15, 2022.

Borrowings under the Hercules Loan Agreement bear interest at a variable rate equal to the greater of (i) 8.75% or (ii) 8.75% plus The Wall Street
Journal prime rate minus 6.0%. In an event of default, as defined in the Hercules Loan Agreement, and until such event is no longer continuing, the interest
rate applicable to borrowings under the agreement would be increased by 4.0%. As of December 31, 2019, the interest rate applicable to borrowings was
8.75%.

Borrowings under the agreement are repayable in monthly interest-only payments through January 1, 2022, and in equal monthly payments of principal and
accrued interest from February 1, 2022 until the maturity date of the loan, which is July 1, 2023. At our option, we may prepay all, but not less than all, of
the outstanding borrowings, subject to a prepayment premium of up to 2.0% of the principal amount outstanding as of the date of repayment. In addition,
the Hercules Loan Agreement provides for payments of (i) $0.8 million payable upon the earlier of November 1, 2021 or the repayment in full of all
obligations under the agreement, and (ii) 4.0% of the aggregate principal amount of advances drawn under the Hercules Loan Agreement payable upon the
earlier of maturity or the repayment in full of all obligations under the agreement.

Borrowings under the Hercules Loan Agreement are collateralized by substantially all of our personal property and other assets except for our intellectual
property (but including rights to payment and proceeds from the sale, licensing or disposition of the intellectual property). Our obligations under the
agreement are subject to acceleration upon occurrence of specified events of default, including payment default, insolvency and a material adverse change
in our business, operations or financial or other conditions.

Under the agreement, we have agreed to affirmative and negative covenants to which we will remain subject until maturity or repayment of the loan in full.
The covenants include (a) maintaining a minimum liquidity amount of the lesser of (i) 125% of the aggregate principal amount of outstanding borrowings
under the Hercules Loan Agreement and (ii) 100% of our cash and cash equivalents (other than up to $2.5 million which may be held by an excluded
subsidiary, as defined) in an account in which Hercules has a first priority security interest, as well as (b) restrictions on our ability to incur additional
indebtedness, pay dividends, encumber our intellectual property, or engage in certain fundamental business transactions, such as mergers or acquisitions of
other businesses. The Hercules Loan Agreement also contains a covenant that required us to repay our FFG loans on or prior to December 31, 2019, and we
repaid the FFG loans in September 2019. We were in compliance with all covenants under the Hercules Loan Agreement as of December 31, 2019.

FFG Borrowings
Between September 2011 and March 2017, Arsanis GmbH, a subsidiary of Arsanis, entered into a series of funding agreements with FFG that provided for
loans and grants to fund qualifying research and development expenditures of Arsanis GmbH on a project-by-project basis, as approved by FFG. On
March 8, 2019, Arsanis entered into a settlement agreement, or the FFG Settlement Agreement, with FFG in respect of allegations that Arsanis breached
certain reporting, performance and other obligations. Pursuant to the terms of the FFG Settlement Agreement, in exchange for FFG’s waiver of all claims
against Arsanis and Arsanis GmbH except for its claims for repayment of the loans and regular interest, including its waiver of claims for repayment of
grants and interest exceeding regular interest, Arsanis GmbH agreed to repay the outstanding loan principal (plus

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regular interest accrued thereon) on an accelerated payment schedule of three years instead of the original five years, with the final accelerated installment
due and payable on June 30, 2021. The FFG Settlement Agreement also contained certain other restrictive covenants, including a requirement to maintain,
as of April 30, 2019, a minimum cash balance equal to 70% of the outstanding principal amount of the loans in an account held with an Austrian bank, until
all of the loans have been repaid and subject to other terms specified in the FFG Settlement Agreement. Amounts due under the FFG loans bore interest at
varying fixed rates ranging from 0.75% to 2.0% per annum.

During the quarter ended September 30, 2019, we re-paid the full amount due on the FFG loan of approximately $6.5 million, and the FFG loans were
retired. We recognized a loss on extinguishment of debt of $0.6 million related to the unamortized debt discount as of the date of retirement.

Funding Requirements
We expect our expenses to increase in connection with our ongoing activities, particularly as we advance the clinical trials of our product candidates in
development. In addition, we expect to continue to incur additional costs operating as a public company. 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:

•

•

•

•

•

•

•

•

•

•

•

•

•

•

the scope, number, initiation, progress, timing, costs, design, duration, any potential delays, and results of clinical trials and
nonclinical studies for our current or future product candidates, particularly our Phase 3 pivotal clinical trial of mavorixafor for the
treatment of patients with WHIM syndrome, our Phase 1b clinical trial of mavorixafor in SCN and our Phase 1b clinical trial of
mavorixafor in WM;

the clinical development plans we establish for these product candidates;

the number and characteristics of product candidates and programs that we develop or may in-license;

the outcome, timing and cost of regulatory reviews, approvals or other actions to meet regulatory requirements established by the
FDA and comparable foreign regulatory authorities, including the potential for the FDA or comparable foreign regulatory authorities
to require that we perform more studies for our product candidates than those that we currently expect;

our ability to obtain marketing approval for our product candidates;

the cost of filing, prosecuting, defending and enforcing our patent claims and other intellectual property rights covering our product
candidates, including any such patent claims and intellectual property rights that we have licensed from Genzyme pursuant to the
terms of our license agreement with Genzyme;

our ability to maintain, expand and defend the scope of our intellectual property portfolio, including the cost of defending intellectual
property disputes, including patent infringement actions brought by third parties against us or our product candidates;

the cost and timing of completion of commercial-scale outsourced manufacturing activities with respect to our product candidates;

our ability to establish and maintain licensing, collaboration or similar arrangements on favorable terms and whether and to what
extent we retain development or commercialization responsibilities under any new licensing, collaboration or similar arrangement;

the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory
approval in regions where we choose to commercialize our products on our own;

the success of any other business, product or technology that we acquire or in which we invest;

the costs of acquiring, licensing or investing in businesses, product candidates and technologies;

our need and ability to hire additional management and scientific and medical personnel;

the costs to continue to operate as a public company, including the need to implement additional financial and reporting systems and
other internal systems and infrastructure for our business;

• market acceptance of our product candidates, to the extent any are approved for commercial sale; and

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•

the effect of competing technological and market developments.

We expect that our existing cash and cash equivalents will be sufficient to fund our operating expenses, capital expenditure requirements and debt service
payments for at least the next twelve months. We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our capital
resources sooner than we expect.

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings,
debt financings, collaborations, strategic alliances, and marketing, distribution or licensing arrangements with third parties. In January 2019, we filed a
universal shelf registration statement on Form S-3 with the SEC, which was declared effective in February 2019, pursuant to which we registered for sale
up to $150 million of any combination of our common stock, preferred stock, debt securities, warrants and/or units from time to time and at prices and on
terms that we may determine. Subsequently, in April 2019, we raised $79.3 million, net of offering costs, for the sale of common stock, prefunded warrants
to purchase shares of common stock, and accompanying Class A warrants to purchase shares of our common stock. As of the date of this Annual Report,
$12 million of securities remain available for issuance under this shelf registration statement. In August 2019, we filed a shelf registration statement on
Form S-3 with the SEC, which was declared effective in August 2019, pursuant to which we registered for sale up to $150 million of any combination of
our common stock, preferred stock, debt securities, warrants and/or units from time to time and at prices and on terms that we may determine.
Subsequently, in November 2019, we raised $60.1 million, net of offering costs, for the sale of common stock, prefunded warrants to purchase shares of
common stock or Class B warrants, and accompanying Class B warrants to purchase shares of our common stock. As of the date of this Annual Report,
approximately $3.0 million of securities remain available for issuance under this shelf registration statement.

To the extent that we raise additional capital through future equity offerings or debt financings, the ownership interest of our stockholders may be
materially diluted, and the terms of such securities could include liquidation or other preferences that adversely affect the rights of our stockholders. Debt
financing and preferred equity financing, if available, may involve agreements that include restrictive covenants that limit our ability to take specified
actions, such as incurring additional debt, making 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. If we are unable to raise additional
funds through equity or debt financings or other arrangements when needed, we may be required to delay, reduce or eliminate our product development
efforts 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

As a smaller reporting company, we are not required to provide the disclosure required by Item 303(a)(5) of Regulation S-K.

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. The preparation of our
consolidated financial statements and related disclosures requires us to make estimates and judgments that affect the reported amounts of assets, liabilities,
costs and expenses, and the disclosure of contingent assets and liabilities in our consolidated financial statements. 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.

While our significant accounting policies are described in more detail in Note 2 to our consolidated financial statements included elsewhere in this Annual
Report, we believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our consolidated
financial statements.

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

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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 them at that time. We periodically confirm the accuracy of these 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 preclinical development activities;

CROs and investigative sites in connection with preclinical studies and clinical trials; and

CMOs in connection with the production of preclinical and clinical trial materials.

We base the expense recorded related to external research and development on our estimates of the services received and efforts expended pursuant to
quotes and contracts with multiple CMOs and CROs that supply, 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. Payments under some of these
contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones. 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 the amount of prepaid expenses 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.

Stock-Based Compensation.   We measure all stock-based awards granted to employees, directors and consultants based on the grant-date fair value of the
award and recognized compensation expense, net of estimated forfeitures, over the requisite service period, which is generally the vesting period of the
respective award. The stock-based awards that we have issued to date include a service-based vesting condition and the expense for these awards is
recognized using the straight-line method. To date, we have not issued stock-based awards with performance-based vesting conditions.

The fair value of stock option grants is estimated on the date of grant using the Black-Scholes option-pricing model, which 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 the stock options, the risk-free interest rate for a
period that approximates the expected term of our stock options and their expected dividend yield. Prior to the closing of the Merger and the listing of our
common stock on the Nasdaq Capital Market, our board of directors historically determined, as of the date of each option grant and with input from our
management, the assistance of a third-party valuation specialist the estimated fair value of our common stock on the date of grant based on a number of
objectives and subjective factors. Since the Merger and the listing of our common stock on the Nasdaq Capital Market, we have relied on the market price
of our common stock to determine the fair value on the date of grant. As our common stock does not have a sufficient history of trading, we estimate our
volatility based on the historical volatility of publicly traded peer companies. We estimate the expected term of our stock awards by utilizing the
“simplified” method, which calculates the expected term based on weighted average midpoint of the award’s vesting and expiration dates. We determine
the risk-free interest rate 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. We estimate that no dividends will be paid as we do not expect to pay cash dividends in the foreseeable future.

The assumptions underlying these valuations represent the best estimates of our management, which involve inherent uncertainties and the application of
our judgment. As a result, if factors or expected outcomes change and we use significantly different assumptions or estimates, the resulting share-based
compensation expense could be materially different.

Valuation of Preferred Stock Warrant Liability.   In connection with our preferred stock financings prior to our merger with Arsanis in March 2019, we
issued warrants to purchase shares of our preferred stock. We classified these warrants as liabilities on our consolidated balance sheet because they were
deemed to be freestanding financial instruments that may have required us to transfer assets upon exercise. The warrant liability was initially recorded at
fair value upon the date of issuance of each warrant

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and is subsequently remeasured to fair value at each reporting date as a component of other income (expense), net in our consolidated statements of
operations. Upon the closing of the Merger on March 13, 2019, all outstanding preferred stock warrants become exercisable for Arsanis common stock and,
accordingly, the warrant liability as of March 13, 2019 was remeasured to fair value and reclassified to additional paid-in capital. As a result, following the
closing of the Merger, we no longer recognize changes in the fair value of the warrant liability as other income (expense), net in our consolidated statement
of operations and comprehensive loss.

To value the preferred stock warrants, we used various valuation methods, including the Monte Carlo method, the option-pricing method and the hybrid
method, all of which incorporated assumptions and estimates. We assessed these assumptions and estimates on a quarterly basis as additional information
impacting the assumptions is obtained. Estimates and assumptions impacting the fair value measurement included the fair value per share of the underlying
shares of our Series A and Series B preferred stock, risk-free interest rate, expected dividend yield, expected volatility of the price of the underlying
preferred stock, and the remaining contractual term of the warrants (except for the warrants that would be automatically exercised upon an initial public
offering, in which case the remaining estimated term to automatic exercise was used). The most significant assumption in the Monte Carlo method, the
option-pricing method and the hybrid method impacting the fair value of the preferred stock warrants was the fair value of our preferred stock as of each
remeasurement date. We determined the fair value per share of the underlying preferred stock by taking into consideration the most recent sales of our
preferred stock, results obtained from third-party valuations and additional factors that are deemed relevant.

Purchase Accounting. Business combinations are accounted for under the acquisition method, whereby the total purchase price of an acquisition is
allocated to the underlying identifiable net assets, based on their respective estimated fair values as of the acquisition date. Application of the acquisition
method is complex and can require significant judgment. For example, to properly account for a business combination, management must determine the
following:

• Whether the entity acquired constitutes a business or a set of assets. Management considers whether the majority (i.e. 90%) of the value of the

•

•

•

•

•

acquired entity is concentrated in one asset or set of similar assets.
The identification of the acquirer for accounting purposes, which may differ from the legal acquirer. To make this determination, management
considers which entity's stockholders own a substantial majority of the voting rights in the combined organization, (ii) the composition of the
initial board of directors of the combined organization and (iii) the senior management team of the combined organization.
Identification of transactions that must be accounted for separately from the acquired entity. For example, severance and retention bonuses which
were arranged for the benefit of the acquirer.
The fair value of consideration transferred to effect the acquisition, including the value of shares of common stock issued and contingent
consideration transferred;
The accounting for equity compensation arrangement acquired, including the fair value of replacement awards and whether the value of these
awards is ascribed to compensation for past services, which is included in the consideration transferred to effect the acquisition, or for future
services, which is accounted for prospectively as stock-based compensation expense
The fair value of assets acquired and liabilities assumed, which requires management’s judgment and often involves the use of significant
estimates and assumptions, including assumptions with respect to future cash inflows and outflows, probabilities of success, discount rates, and
asset lives, among other items.

Lease Accounting. We adopted the new lease standard effective January 1, 2019 as further described in Note 2 to the consolidated financial statements
included in this Annual Report on Form 10-K. The new standard requires that all leases, with the exception of leases with a remaining term of less than 12
months, are accounted for as a right-of-use asset with an associated lease liability on the consolidated balance sheet. Management must apply judgment in
the application of the new lease standard in the determination of the following:

• Whether a contract contains a lease. Management considers whether the contract conveys the right to control an asset for a period of time in

•
•

excess of one year. Management also considers whether the counterparty has the right to substitute the asset without management's consent, in
which case the contract would generally not contain a lease.
The term of the lease, which includes a determination of the probability that management will exercise its option to extend the lease.
The discount rate applied to the lease liability, which in most cases is not a rate that is implicit and readily determinable within the lease. In this
case, management calculates its incremental collateralized borrowing rate by reference to recent third-party borrowings, such as observed in its
Hercules loan agreement, as adjusts this rate to match the term of the lease.

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•

The commencement date of the lease for accounting purposes, which occurs when the lessor provides management with unfettered access to the
leased asset. Management also considers the condition of the leased asset at the inception of the lease agreement and whether unreimbursed costs
incurred by management to enhance or construct the leased asset represent prepaid rent and are part of the right-of-use asset or represent leasehold
improvements. Management considers the nature and significance of the improvements to the leased asset and whether these improvements were
required by the lessor, which indicates that the improvements relate to the lessor's asset, or were at management's election, which indicates that the
costs represent leasehold improvements.

Emerging Growth Company Status

The JOBS Act permits an “emerging growth company” such as us to take advantage of an extended transition period to comply with new or revised
accounting standards applicable to public companies until those standards would otherwise apply to private companies. We have irrevocably elected to “opt
out” of this provision and, as a result, we will comply with new or revised accounting standards when they are required to be adopted by public companies
that are not emerging growth companies.

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 Issued Accounting Pronouncements

A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in
Note 2 to our consolidated financial statements appearing at the end of this Annual Report on Form 10-K.

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

As a smaller reporting company, we are not required to provide disclosure for this Item.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements required to be filed pursuant to this Item 8 are appended to this report. An index of those financial statements is found in Item 15
of Part IV of this Annual Report on Form 10-K.

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURES

None.

ITEM 9A.  CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We maintain “disclosure controls and procedures” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, that are designed to ensure that
information required to be disclosed in the reports we file and submit 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 us in the reports we file or submit under the Exchange Act is accumulated and communicated to our
management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required
disclosure. In designing and evaluating our disclosure controls and procedures, 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 benefits of possible controls and procedures relative to their costs.

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Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, who serve as our principal executive officer and
principal financial officer, respectively, has evaluated the effectiveness of our disclosure controls and procedures as of December 31, 2019. Based on such
evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective at the
reasonable assurance level as of such date.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting for the company. Internal control over
financial reporting is defined in Rule 13a-15(f) or 15d-15(f) promulgated under the Exchange Act as a process designed by, or under the supervision of, the
company’s principal executive and principal financial officers and effected by the company’s board of directors, management and other personnel, 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 and includes those policies and procedures that:

•

•

•

pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the
assets of the company;

provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance
with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance
with authorizations of management and directors of the company; and

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 the financial statements.

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.

Our management is responsible for establishing and maintaining an adequate system of internal control over financial reporting, as defined in the Exchange
Act Rule 13a-15(f). Management conducted an assessment of our internal control over financial reporting based on the framework established in 2013 by
the Committee of Sponsoring Organizations of the Treadway Commission in Internal Control-Integrated Framework (2013). Based on the assessment,
management concluded that, as of December 31, 2019, our internal control over financial reporting was effective.

This Annual Report does not include an attestation report of our registered public accounting firm regarding internal control over financial reporting due to
an exemption established by the JOBS Act for "emerging growth companies".

Changes in Internal Control over Financial Reporting
There has been no significant change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act)
during the quarter ended December 31, 2019 that has materially affected, or is reasonably likely to materially affect, our internal control over financial
reporting.

ITEM 9B.  OTHER INFORMATION

None.

83

Table of Contents

PART III

ITEM 10.  DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this Item is incorporated by reference to the information set forth in the sections titled "Proposal 1- Election of Directors,"
"Information About our Executive Officers," and "Information Regarding the Board of Directors and Corporate Governance" and "Delinquent Section
16(a) Reports" in our 2020 Proxy Statement.

ITEM 11.  EXECUTIVE COMPENSATION

The information required by this Item is incorporated by reference to the information set forth in the sections titled "Executive Compensation" in our 2020
Proxy Statement.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER

MATTERS

The information required by this Item is incorporated by reference to the information set forth in the section titled "Security Ownership of Certain
Beneficial Owners and Management" and "Equity Compensation Plan Information" in our 2020 Proxy Statement.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this Item is incorporated by reference to the information set forth in the section titled "Transactions with Related Persons and
Indemnification" and "Information regarding the Board of Directors and Corporate Governance" in our 2020 Proxy Statement.

ITEM 14.  PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by this Item is incorporated by reference to the information set forth in the section titled "Principal Accountant Fees and
Services" contained in our 2020 Proxy Statement.

84

Table of Contents

ITEM 15.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(1) Financial Statements

PART IV

The following documents are included on pages F-1 through F-39 attached hereto and are filed as part of this Annual Report.

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets

Consolidated Statements of Operations and Comprehensive Loss

Consolidated Statements of Convertible Preferred Stock, Redeemable Common Stock and Stockholders’ Equity (Deficit)

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

(2) Financial Statement Schedules:

Page

F-2

F-3

F-4

F-5

F-6

F-7

All financial statement schedules have been omitted because they are not applicable, not required or the information required is shown in the financial
statements or the notes thereto.

(3) Exhibits.

Exhibit No.
2.1

2.2

2.3

3.1

3.2

3.3

3.4

4.1

4.2

4.3

4.4

Exhibit Description

Agreement and Plan of Merger, dated November 26, 2018, by and among the
Company, Artemis AC Corp. and X4 Therapeutics, Inc. (formerly X4
Pharmaceuticals, Inc.)
First Amendment to Agreement and Plan of Merger, dated December 20, 2018, by
and among the Company, Artemis AC Corp. and X4 Therapeutics, Inc. (formerly
X4 Pharmaceuticals, Inc.)
Second Amendment to Agreement and Plan of Merger, dated March 8, 2019, by and
among the Company, Artemis AC Corp. and X4 Therapeutics, Inc. (formerly X4
Pharmaceuticals, Inc.)
Restated Certificate of Incorporation, filed with the Secretary of State of the State
of  Delaware on November 20, 2017.
Certificate of Amendment (Reverse Stock Split) to the Restated Certificate of
Incorporation of the Company
Certificate of Amendment (Name Change) to the Restated Certificate of
Incorporation of the Company
Amended and Restated By-laws of the Company

Form of Common Stock Certificate

Form of Warrant to Purchase Common Stock of the Company (formerly Series A
Preferred Stock of X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.))
issued to Silicon Valley Bank and Life Science Loans, LLC.
Form of Warrant to Purchase Common Stock of the Company (formerly Series A
Preferred Stock of X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.))
issued to Maxim Partners LLC.
Form of Warrant to Purchase Common Stock of the Company (formerly Series B
Preferred Stock of X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.)).

Form
8-K

Exhibit
2.1

Date
11/27/2018

Se File/ Ref No.
001-38295

8-K

2.1

12/20/2018

001-38295

8-K

8-K

8-K

8-K

8-K

8-K

8-K

8-K

8-K

2.1

3.1

3.1

3.2

3.2

4.1

4.2

4.3

4.4

3/8/2019

001-38295

11/20/2017

001-38295

3/13/2019

001-38295

3/13/2019

001-38295

11/20/2017

3/13/2019

3/13/2019

001-38295

001-38295

001-38295

3/13/2019

001-38295

3/13/2019

001-38295

85

Table of Contents

4.5

4.6

4.7

4.8

4.9

4.10

4.11

4.12*
10.1@

10.2@

10.3@

10.4@

10.5@

10.6@

10.7@

10.8@

10.9@

Form of Warrant to Purchase Common Stock of the Company (formerly Series B
Preferred Stock of X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.))
issued to Hercules Capital, Inc.
Warrant Modification Agreement, dated as of December 11, 2018, with Hercules
Capital, Inc.
Form of Prefunded Warrant.

Form of Class A Warrant

Form of Prefunded Warrant

Form of Class B Warrant

Share Purchase Agreement, dated as of November  15, 2017, by and between the
Company and New Enterprise Associates 16, L.P.
Description of Registered Securities

2015 Employee, Director and Consultant Equity Incentive Plan, as amended.

Form of Stock Option Agreement under the 2015 Employee, Director and
Consultant Equity Incentive Plan, as amended.
Form of Restricted Stock Unit Agreement under the 2015 Employee, Director and
Consultant Equity Incentive Plan, as amended
2017 Equity Incentive Plan

Form of Incentive Stock Option Agreement under the 2017 Equity Incentive Plan

Form of Nonstatutory Stock Option Agreement under the 2017 Equity Incentive
Plan
Form of Restricted Stock Agreement under the 2017 Equity Incentive Plan

Form of Restricted Stock Unit Agreement under the 2017 Equity Incentive Plan

2017 Employee Stock Purchase Plan

10.10@ X4 Pharmaceuticals, Inc. 2019 Inducement Equity Incentive Plan
10.11@ Form of Stock Option Agreement under the 2019 Inducement Equity Incentive Plan
10.12@ Form of Restricted Stock Agreement under the 2019 Inducement Equity Incentive

Plan

10.13@ Form of Restricted Stock Unit Agreement under the 2019 Inducement Equity

Incentive Plan

10.14@ Form of Indemnification Agreement (for directors and executive officers)
10.15@ Director Compensation Policy
10.16@ Amended and Restated Executive Employment Agreement, dated as of March 13,

2019, by and between the Company and Paula Ragan, Ph.D.
Amendment to Amended and Restated Executive Employment Agreement, dated as
of March 13, 2019, dated February 13, 2020 by and between the Company and
Paula Ragan, Ph.D.

10.17@*

10.18@ Amended and Restated Executive Employment Agreement, dated as of March 13,

2019, by and between the Company and Adam S. Mostafa.
Amendment to Amended and Restated Executive Employment Agreement, dated as
of February 24, 2020 by and between the Company and Adam S. Mostafa

10.19@*

86

10-K

10.37

3/9/2018

10.1.1

10.1.2

3/13/2019

4/2/2019

6/17/2019

001-38295

8-K

8-K

8-K

8-K

8-K

8-K

4.5

4.6

4.1

4.2

4.1

4.2

8-K

8-K

8-K

S-1

S-1

S-1

8-K

8-K

S-1

8-K

8-K

8-K

8-K

10.6

10.7

10.8

10.9

10.6

10.5

10.1

10.2

10.3

10.4

3/13/2019

001-38295

3/13/2019

001-38295

04/12/2019

04/12/2019

11/29/2019

11/29/2019

10/20/2017

10/20/2017

10/20/2017

11/27/2018

6/19/2019

6/17/2019

6/17/2019

6/17/2019

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

001-38295

6/17/2019

001-38295

S-1/A

10.36

11/06/2017

8-K

8-K

10.2

10.3

3/13/2019

3/13/2019

001-38295

001-38295

001-38295

8-K

10.4

3/13/2019

001-38295

10.10

10/20/2017

Table of Contents

10.20@*

10.21@*

10.22@*

10.23@*

10.24#

10.25#

10.26#

10.27#

10.28

10.29

10.30

10.31

10.32*

10.33

10.34

10.35*

10.36*

10.37*

10.38*

Executive Employment Agreement, dated as of April 16, 2019, by and between the
Company and E. Lynne Kelley
Amendment to Executive Employment Agreement, dated as of March 5, 2020, by
and between the Company and E. Lynne Kelley
Executive Employment Agreement, dated as of September 25, 2019, by and
between the Company and Derek Meisner
Amendment to Executive Employment Agreement, dated as of February 24, 2020,
by and between the Company and Derek Meisner
License Agreement, dated as of July 10, 2014, by and between X4 Therapeutics,
Inc. (formerly X4 Pharmaceuticals, LLC) and Genzyme Corp., a Sanofi company.
Amendment No. 1 to License Agreement, dated as of October 23, 2014, by and
between X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and Genzyme
Corporation, a Sanofi company.
License Agreement, dated as of December 13, 2016, by and between X4
Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and Georgetown University.
Exclusive License Agreement, dated as of December 23, 2016, by and between X4
Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and Beth Israel Deaconess
Medical Center.
Loan and Security Agreement, dated as of October 19, 2018, by and between X4
Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.) and Hercules Capital, Inc.
Amendment No. 1 to Loan and Security Agreement, dated as of December 11,
2018, by and between X4 Therapeutics, Inc. (formerly X4 Pharmaceuticals, Inc.)
and Hercules Capital, Inc.
Amended and Restated Loan and Security Agreement, dated as of June 27, 2019, by
and among X4 Pharmaceuticals, Inc., X4  Therapeutics, Inc., Hercules Capital, Inc.
and Hercules Capital Funding Trust 2019-1.
Lease, dated as of January 20, 2017, by and between X4 Therapeutics, Inc.
(formerly X4 Pharmaceuticals, Inc.) and Brickman 955 Massachusetts LLC.
Lease, dated as of November 11, 2019, by and between X4 Pharmaceuticals Inc.
and Beacon North Village, LLC.
Lease Termination Agreement, dated February 26, 2019, by and between Arsanis
Biosciences GmbH and Wüstenrot Marxbox GmbH & Co. OG (as successor-in-
interest to Marxbox Bauprojekt GmbH & Co. OG), as amended (English
translation)
Settlement Agreement, dated as of March 8, 2019, by and among X4
Pharmaceuticals, Inc. (formerly Arsanis, Inc.), Artemis AC Corp., X4 Therapeutics,
Inc. (formerly X4 Pharmaceuticals, Inc.), Arsanis Biosciences GmbH and
Österreichische Forschungsförderungsgesellschaft GmbH.
Master Services Agreement, dated September 10, 2015, by and between X4
Pharmaceuticals Inc. and Mayne Pharma Inc. (formerly known as Metrics, Inc.).
Amendment No. 1 to Master Services Agreement, dated August 25, 2017, by and
between X4 Pharmaceuticals Inc. and Mayne Pharma Inc. (formerly known as
Metrics, Inc.)
Amendment No. 2 to Master Services Agreement, dated February 28, 2020, by and
between X4 Pharmaceuticals Inc. and Mayne Pharma Inc.
Master Services Agreement, dated February 19, 2016, by and between X4
Pharmaceuticals Inc. and Aptuit (Oxford) Limited

87

8-K

10.5#

3/13/2019

001-38295

8-K/A

10.6#

5/13/2019

001-38295

8-K/A

10.7#

5/13/2019

001-38295

8-K/A

10.8#

5/13/2019

001-38295

8-K

8-K

10.9

3/13/2019

001-38295

10.10

3/13/2019

001-38295

8-K

10.1

6/28/2019

001-38295

8-K

8-K

8-K

10.11

3/13/2019

001-38295

10.1

3/1/2019

001-38295

8-K

10.1

4/11/2019

001-38295

Table of Contents

10.39*

21.1*

23.1*

31.1*

31.2*

32.1**

32.2**

101.INS

Amendment No. 1 to Master Services Agreement, dated February 19, 2016, by and
between X4 Pharmaceuticals Inc. and Aptuit (Oxford) Limited
List of Subsidiaries

Consent of PricewaterhouseCoopers LLP, Independent Registered Public
Accounting Firm
Certification of the Chief Executive Officer, as required by Section 302 of the
Sarbanes-Oxley Act of 2002
Certification of the Chief Financial Officer, as required by Section 302 of the
Sarbanes-Oxley Act of 2002
Certification of the Chief Executive Officer, as required by Section 906 of the
Sarbanes-Oxley Act of 2002
Certification of the Chief Financial Officer, as required by Section 906 of the
Sarbanes-Oxley Act of 2002
XBRL Instance Document

101.SCH XBRL Taxonomy Extension Schema Document

101.CAL

SXRL Taxonomy Extension Calculation Linkbase Document

101.DEF

XBRL Taxonomy Extension Definition Linkbase Document

101.LAB XBRL Taxonomy Extension Label Linkbase Document

101.PRE

XBRL Taxonomy Extension Presentation Linkbase Document

*

Filed herewith

** Furnished and not filed herewith

# 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  

@ Indicates management contract or compensatory plan

ITEM 16.  FORM 10-K SUMMARY

None.

88

Table of Contents

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 12, 2020

X4 PHARMACEUTICALS, INC.

By:

/s/ Paula Ragan

Paula Ragan, Ph D.

President and Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.

Signature

Title

Date

/s/ Paula Ragan

Paula Ragan, Ph.D.

/s/ Adam S. Mostafa

Adam S. Mostafa

/s/ Michael S. Wyzga

Michael S. Wyzga

/s/ William Aliski

William E. Aliski

/s/ Gary J. Bridger

Gary J. Bridger, Ph.D.

/s/ David McGirr

David McGirr

/s/ René Russo

René Russo, Pharm D

/s/ Murray W. Stewart

Murray W. Stewart, M.D.

President, Chief Executive Officer and Director

March 12, 2020

(Principal Executive Officer)

Chief Financial Officer and Treasurer

March 12, 2020

(Principal Financial Officer and Principal Accounting Officer)

Chairman of the Board of Directors

March 12, 2020

Director

Director

Director

Director

Director

89

March 12, 2020

March 12, 2020

March 12, 2020

March 12, 2020

March 12, 2020

Table of Contents

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 Stock, Redeemable Common Stock and Stockholders’ Equity (Deficit)
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

Page
F-2
F-3
F-4
F-5
F-6
F-7

F-1

Table of Contents

To the Board of Directors and Stockholders of X4 Pharmaceuticals, Inc.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of X4 Pharmaceuticals, Inc. and its subsidiaries (the “Company”) as of December 31, 2019
and 2018, and the related consolidated statements of operations and comprehensive loss, of convertible preferred stock, redeemable common stock and
stockholders’ equity (deficit) and of cash flows for each of the three years in the period ended December 31, 2019, 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, 2019 and 2018, and the results of its operations and its cash flows for each of the three years in the
period ended December 31, 2019 in conformity with accounting principles generally accepted in the United States of America.

Change in Accounting Principle

As discussed in Note 2 to the consolidated financial statements, the Company changed the manner in which it accounts for leases in 2019.

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.

Emphasis of Matter

As discussed in Note 1 to the consolidated financial statements, the Company will require additional financing to fund future operations. Management's
evaluation of the events and conditions and plans to mitigate this matter are also described in Note 1.

/s/ PricewaterhouseCoopers LLP

Boston, Massachusetts

March 12, 2020

We have served as the Company’s auditor since 2016.

F-2

Table of Contents

Assets

Current assets:

Cash and cash equivalents

Research and development incentive receivable

Prepaid expenses and other current assets

Total current assets

Property and equipment, net

Goodwill

Right-of-use assets

Other assets

Total assets

X4 PHARMACEUTICALS INC.
CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts)

December 31,
2019

December 31,
2018

$

126,184    $

1,998   

1,096   

129,278   

403   

27,109   

1,959   

1,949   

8,134   

—   

1,205   

9,339   

241   

—   

—   

364   

160,698    $

9,944   

$

$

Liabilities, Convertible Preferred Stock, Redeemable Common Stock and Stockholders’ Equity (Deficit)

Current liabilities:

Accounts payable

Accrued expenses

Current portion of lease liability

Current portion of long-term debt, net of discount

Total current liabilities

Preferred stock warrant liability

Long-term debt, including accretion, net of discount and current portion

Deferred rent

Lease liabilities

Other liabilities

Total liabilities

Commitments and contingencies (Note 10)
Convertible preferred stock, $0.001 par value; 10,000,000 and 59,413,523 shares authorized as of December 31, 2019

and December 31, 2018, respectively; 0 and 40,079,567 shares issued and outstanding as of December 31, 2019
and December 31, 2018, respectively

Redeemable common stock, $0.001 par value; 0 and 107,371 shares issued and outstanding as of December 31, 2019

and December 31, 2018, respectively

Stockholders’ equity (deficit):
Common stock, $0.001 par value. 33,333,333 and 11,070,776 shares authorized as of December 31, 2019 and

December 31, 2018, respectively; 16,128,862 and 351,652 shares issued and outstanding as of December 31,
2019 and December 31, 2018, respectively

Additional paid-in capital

Accumulated other comprehensive income (loss)

Accumulated deficit

Total stockholders’ equity (deficit)

2,088    $

6,461   

898   

—   

9,447   

—   

20,097   

—   

1,918   

16   

31,478   

—   

—   

16   

261,367   

(119)  

(132,044)  

129,220   

2,969   

3,251   

—   

1,687   

7,907   

4,947   

8,145   

417   

—   

205   

21,621   

64,675   

734   

—   

2,151   

—   

(79,237)  

(77,086)  

9,944   

Total liabilities, convertible preferred stock, redeemable common stock and stockholders’ equity (deficit)

$

160,698    $

The accompanying notes are an integral part of these consolidated financial statements

F-3

Table of Contents

X4 PHARMACEUTICALS, INC.
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except per share amounts)

Operating expenses:

Research and development

General and administrative

Loss on transfer of nonfinancial assets

Total operating expenses

Loss from operations

Other income (expense):

Interest income

Interest expense

Change in fair value of preferred stock warrant liability

Change in fair value of derivative liability

Loss on preferred stock repurchase liability

Loss on extinguishment of debt

Other income

Total other income (expense), net

Net loss

Accruing dividends on Series A convertible preferred stock
Adjustment to accumulated deficit in connection with repurchase of Series Seed convertible

preferred stock

Net loss attributable to common stockholders

Net loss per share attributable to common stockholders—basic and diluted
Weighted average shares of common stock outstanding—basic and diluted

Net loss

Currency translation adjustments

Total comprehensive loss

Year Ended December 31,

2019

2018

2017

$

30,163    $

20,346    $

17,640   

3,900   

51,703   

(51,703)  

1,197   

(2,147)  

(288)  

183   

—   

(566)  

517   

(1,104)  

(52,807)  

(592)  

8,739   

—   

29,085   

(29,085)  

236   

(720)  

(3,398)  

(89)  

—   

(229)  

—   

(4,200)  

(33,285)  

(3,000)  

17,066   

5,181   

—   

22,247   

(22,247)  

64   

(490)  

1,360   

(94)  

(587)  

—   

—   

253   

(21,994)  

(3,000)  

—   

(22)  

—   

(53,399)   $

(36,307)   $

(24,994)  

(4.63)   $

(79.15)   $

(54.58)  

11,530   

459   

458   

(52,807)   $

(33,285)  

(21,994)  

(119)  

—   

—   

(52,926)   $

(33,285)   $

(21,994)  

$

$

$

$

The accompanying notes are an integral part of these consolidated financial statements.

F-4

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK, REDEEMABLE COMMON STOCK AND STOCKHOLDERS’
EQUITY (DEFICIT)

(In thousands, except share amounts)

X4 PHARMACEUTICALS, INC.

Balance at December 31, 2016

22,061,973    $ 34,307   

107,371    $

734   

345,856    $ —    $

884    $

—    $

(23,936)   $

(23,052)  

Series Seed, A and B
Convertible Preferred

Redeemable
Common Stock

Common Stock

Shares 

  Amount

Shares

Amount

Shares

Amount

Additional
Paid-In
Capital

Accumulated
Other
Comprehensive
Income (Loss)

Accumulated
Deficit

Total
Stockholders'
(Deficit)
Equity

Issuance costs of convertible preferred stock,
net of issuance costs of $2.6 million
Exercise of stock options
Stock-based compensation expense
Net loss
Balance at December 31, 2017

Repurchase of Series Seed convertible
preferred stock, net of issuance costs of $11
Issuance costs of convertible preferred stock,
net of issuance costs of $539
Exercise of stock options
Stock-based compensation expense
Net loss
Balance at December 31, 2018

Conversion of redeemable common stock into
common stock
Conversion of convertible preferred shares
into common stock
Exchange of common stock in connection
with Merger
Fair value of replacement equity awards
Reclassification of warrant liability to
permanent equity
Issuance of common stock and prefunded
warrants for the purchase of common stock,
net of issuance costs of $11.4 million
Exercise of stock options
Exercise of warrants
Stock-based compensation expense
Foreign currency translation adjustment
Net loss
Balance at December 31, 2019

15,956,995   

26,596   

4,751   

—   

9   
492   

—   
9   
492   
(21,994)  

(21,994)  

38,018,968   

60,903   

107,371   

734   

350,607   

—   

1,385   

—   

(45,930)  

(44,545)  

(598,975)  

(517)  

2,659,574   

4,289   

1,045   

7   
759   

(22)  

(22)  

—   
7   
759   
(33,285)  

(33,285)  

40,079,567   

64,675   

107,371   

734   

351,652   

—   

2,151   

—   

(79,237)  

(77,086)  

(40,079,567)  

(64,675)  

(107,371)  

(734)  

107,364   

—   

734   

3,808,430   

2,440,582   

4   

2   

64,671   

45,539   
817   

5,235   

9,336,667   
50,321   
33,846   

9   
1   
—   

139,379   
344   
447   
2,050   

734   

64,675   

45,541   
817   

5,235   

139,388   
345   
447   
2,050   
(119)  
(52,807)  

(119)  

(52,807)  

—   

—   

—   

—   

16,128,862    $

16    $ 261,367    $

(119)   $ (132,044)   $

129,220   

The accompanying notes are a integral part of these consolidated financial statements

F-5

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X4 PHARMACEUTICALS, 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:

Stock-based compensation expense
Depreciation and amortization expense
Loss on transfer of non-financial assets
Non-cash lease expense
Accretion of debt discount
Loss on extinguishment of debt
Loss on preferred stock repurchase liability
Change in fair value of preferred stock warrant and derivative liability

Changes in operating assets and liabilities:

Prepaid expenses, other current assets and research & development incentive receivable
Accounts payable
Accrued expenses
Lease liabilities

Net cash used in operating activities

Cash flows from investing activities:

Cash, cash equivalents and restricted cash acquired in connection with the Merger
Proceeds from transfer of non-financial assets
Purchase of property, equipment and intangible assets

Net cash provided by (used in) investing activities

Cash flows from financing activities:
Proceeds from exercise of stock options and warrants
Proceeds from borrowings under loan and security agreements, net of issuance costs
Proceeds from issuance of Series B convertible preferred stock, net of issuance costs
Repurchase of Series Seed convertible preferred stock
Repayments of borrowings under loan and security agreement
Proceeds from sale of common stock and warrants, net of issuance costs

Net cash provided by financing activities

Effect of exchange rate changes on cash, cash equivalents and restricted cash

Net increase (decrease) in cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash at beginning of period
Cash, cash equivalents and restricted cash at end of period

Supplemental disclosure of cash flow information
Cash paid for interest
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property, equipment and intangible assets included in accounts payable
Issuance costs related to sale of common stock and warrants, not yet paid
Conversion of convertible preferred stock into common stock
Conversion of redeemable common stock into common stock
Conversion of convertible preferred stock warrants into common stock warrants
Fair value of net assets acquired in the Merger in exchange for common shares, excluding cash acquired
Initial fair value of derivative liability in connection with loan and security agreement
Issuance of warrants in connection with Series B convertible preferred stock financing
Issuance of warrants in connection with loan and security agreement

Year Ended
December 31,

2019

2018

2017

$

(52,807)   $

(33,285)   $

(21,994)  

2,050   
103   
3,900   
569   
695   
566   
—   
105   

109   
(2,752)  
160   
(753)  

(48,055)  

26,406   
1,000   
(174)  

27,232   

792   
9,849   
—   
—   
(9,368)  
139,388   

140,661   

(250)  

119,588   
8,498   

759   
103   
—   
—   
152   
229   
—   
3,487   

279   
1,307   
1,549   
—   

(25,420)  

—   
—   
—   

—   

7   
9,908   
4,461   
(1,126)  
(6,380)  
—   

6,870   

—   

(18,550)  
27,048   

$

$

$
$
$
$
$
$
$
$
$

128,086    $

8,498    $

1,284    $

540    $

40    $
775   
64,675    $
734    $
5,235    $
19,952    $
—    $
—    $
—    $

—    $

—    $
—    $
—    $
—    $
18    $
172    $
132    $

492   
71   
—   
—   
157   
—   
587   
(1,266)  

402   
(1,169)  
1,409   
—   

(21,311)  

—   
—   
(378)  

(378)  

9   
6,000   
27,413   
—   
—   
—   

33,422   

—   

11,733   
15,315   

27,048   

282   

—   

—   
—   
—   
—   
—   
817   
—   

The accompanying notes are an integral part of these consolidated financial statements.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Nature of the Business and Basis of Presentation

X4 Pharmaceuticals, Inc. (formerly Arsanis, Inc.), together with its subsidiaries (the “Company”), is a clinical-stage biotechnology company focused on the
research, development and commercialization of novel therapeutics for the treatment of rare diseases. The Company’s lead product candidate, mavorixafor
(X4P-001), is a potential first-in-class, once-daily, oral inhibitor of CXCR4 and is currently in a Phase 3 clinical trial for the treatment of WHIM syndrome,
a rare, inherited, primary immunodeficiency disease caused by genetic mutations in the CXCR4 receptor gene.  The Company is headquartered in
Cambridge, Massachusetts.

The Company is subject to risks and uncertainties common to pre-commercialization 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
governmental regulations and the ability to secure additional capital to fund operations. Drug candidates currently under development will require extensive
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 drug development efforts are successful, it is
uncertain when, if ever, the Company will realize significant revenue from product sales.

Merger with Arsanis

On November 26, 2018, Arsanis, Inc., a publicly held Delaware corporation (“Arsanis”), Artemis AC Corp., a Delaware corporation and a wholly-owned
subsidiary of Arsanis (“Merger Sub”), and X4 Therapeutics, Inc. (“X4”) entered into an Agreement and Plan of Merger, as amended on December 20, 2018
and March 8, 2019 (the “Merger Agreement”), pursuant to which the Merger Sub merged with and into X4, with X4 surviving the merger as a wholly-
owned subsidiary of Arsanis. The transactions described in the foregoing sentence may be referred to in these consolidated financial statements as “the
Merger.”

The transaction was accounted for as a reverse merger in accordance with accounting principles generally accepted in the United States of America
("GAAP"). Under this method of accounting, X4 was deemed to be the accounting acquirer for financial reporting purposes. This determination was
primarily based on the facts that, immediately following the Merger: (i) the Company’s stockholders own a substantial majority of the voting rights in the
combined organization, (ii) the Company designated a majority of the members of the initial board of directors of the combined organization and (iii) the
Company’s senior management hold all key positions in the senior management of the combined organization. Accordingly, for accounting purposes, the
business combination was treated as the equivalent of X4 issuing stock to acquire the net assets of Arsanis. As a result, as of the closing date of the Merger,
the net assets of Arsanis were recorded at their acquisition-date fair values in the financial statements of the Company and the reported operating results
prior to the business combination are those of the Company. In addition, transaction costs incurred by the Company in connection with the business
combination have been expensed as incurred.

On March 13, 2019, Arsanis, X4 and Merger Sub completed the Merger pursuant to the terms of the Merger Agreement. Pursuant to the terms of the
Merger Agreement, each outstanding share of X4’s common stock and preferred stock was exchanged for 0.5702 shares of Arsanis’s common stock (the
“Exchange Ratio”). In addition, all outstanding options exercisable for common stock and warrants exercisable for convertible preferred stock of X4
became options and warrants exercisable for the same number of shares of common stock of Arsanis multiplied by the Exchange Ratio. In connection with
the Merger, X4 changed its name to X4 Therapeutics, Inc. Following the closing of the Merger, X4 Therapeutics, Inc. became a wholly-owned subsidiary
of the Company, which changed its name to X4 Pharmaceuticals, Inc. As used herein, the words “the Company” refers to, for periods following the Merger,
X4 Pharmaceuticals, Inc. (formerly Arsanis, Inc.), together with is direct and indirect subsidiaries, and for periods prior to the Merger, X4 Therapeutics,
Inc. (formerly X4 Pharmaceuticals, Inc.), and its direct and indirect subsidiaries, as applicable.

Immediately following the Merger, stockholders of X4 owned approximately 64% of the combined organization’s outstanding common stock. On
March 14, 2019, the combined organization’s common stock began trading on The Nasdaq Capital Market under the ticker symbol “XFOR.”

Principles of Consolidation— The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, including X4
Pharmaceuticals (Austria) GmbH, which is incorporated in Vienna, Austria and was formerly named Arsanis Biosciences GmbH (“X4 GmbH”), and X4
Therapeutics, Inc. All significant intercompany accounts and transactions have been eliminated.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Reverse Stock Split— On March 13, 2019, immediately following the closing of the Merger, the Company effected a 1-for-6 reverse stock split of its
common stock (the “Reverse Stock Split”). Accordingly, all share and per share amounts for all periods presented in the accompanying consolidated
financial statements and notes thereto have been adjusted retroactively, where applicable, to reflect the Reverse Stock Split. No fractional shares were
issued in connection with the Reverse Stock Split. Unless otherwise noted, all references to common stock share and per share amounts have also been
adjusted to reflect the exchange ratio of 0.5702.

Going Concern Assessment— In accordance with Accounting Standards Update (“ASU”) No. 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 certain 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 the consolidated
financial statements are issued. As of March 12, 2020, the issuance date of these consolidated financial statements, the Company expects that its cash and
cash equivalents will be sufficient to fund its forecasted operating expenses, capital expenditure requirements and debt service payments for at least the
next twelve months from the issuance date of these financial statements.

Since its inception, the Company has incurred significant operating losses and negative cash flows from operations. The Company has not yet
commercialized any products and does not expect to generate revenue from the commercial sale of any products for several years, if at all. The Company
expects that its research and development and general and administrative expenses will continue to increase and, as a result, will need additional capital to
fund its future operations, which it may raise through a combination of equity offerings, debt financings, other third-party funding, marketing and
distribution arrangements and other collaborations, strategic alliances and licensing arrangements.

The Company has funded its operations to date primarily with proceeds from sales of common stock, warrants and prefunded warrants for the purchase of
shares of preferred stock and shares of common stock, sales of preferred stock, proceeds from the issuance of convertible debt and borrowings under loan
and security agreements. In 2019, the Company completed a merger with Arsanis and acquired its $26.4 million of cash, cash equivalents and restricted
cash. In addition, in 2019, the Company raised $139.4 million, net of offering costs, through public offerings of common stock, prefunded warrants to
purchase shares of common stock, and accompanying warrants to purchase shares of common stock. In June 2019, the Company received $9.8 million in
net proceeds as a result of refinancing its loan agreement (the “Hercules Loan Agreement”) with Hercules Capital, Inc. (“Hercules”), under which, subject
to approval by Hercules, an additional $5.0 million is available for borrowing through December 15, 2020 and an additional term loan of $10.0 million is
available through June 15, 2022. Principal payments under the Hercules Loan Agreement commence in February 2022.

If the Company is unable to obtain future funding when needed, the Company may be forced to delay, reduce or eliminate some or all of its research and
development programs, product portfolio expansion or pre-commercialization efforts, which could adversely affect its business prospects, or the Company
may be unable to continue operations. There is no assurance that the Company will be successful in obtaining sufficient funding on terms acceptable to the
Company to fund continuing operations, if at all.

2. Summary of Significant Accounting Policies

Use of Estimates— The preparation of the Company’s consolidated 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 consolidated
financial statements, and the reported amounts of expenses during the reporting period. Significant estimates and assumptions reflected in these
consolidated financial statements include, but are not limited to, the accrual of research and development expenses, the valuation of intangible assets
acquired in business combinations, the valuations of common stock prior to the Merger, the valuation of stock options, preferred stock warrants (and the
resulting preferred stock warrant liability), derivative instruments (and the resulting derivative liabilities), valuation of lease liabilities and the constraint of
variable consideration from revenue transactions. The Company bases its estimates on historical experience, known trends and other market-specific or
other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates when there are
changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ
from those estimates.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Foreign Currency and Currency Translation— For the Company's subsidiaries that transact in a functional currency other than the U.S. dollar, assets and
liabilities are translated at current exchange rates as of the balance sheet date while income and expenses are translated at the average exchanges rates for
the period. Adjustments resulting from the translation of the financial statements of the Company's foreign operations into U.S. dollars are excluded from
the determination of net loss and are recorded in accumulated other comprehensive loss, a component of stockholders' equity (deficit).

Concentrations of Credit Risk and Significant Suppliers— Financial instruments that potentially subject the Company to concentrations of credit risk
consist principally of cash and cash equivalents and research and development incentive receivables. The Company generally maintains cash balances in
various operating accounts at financial institutions that management believes to be of high credit quality in amounts that may exceed federally insured
limits. The Company has not experienced losses related to its cash and cash equivalents.

The Company is dependent on third-party manufacturers to supply products for research and development activities in its programs. 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 these manufacturing services or in
the supply of active pharmaceutical ingredients and formulated drugs.

Cash and Cash Equivalents— The Company considers all highly liquid investments with maturities of three months or less at the date of purchase to be
cash equivalents. Cash equivalents consisted of money market funds as of December 31, 2019 and 2018.

Restricted Cash—

(in thousands)

Letter of credit security: Cambridge lease

Letter of credit security: Waltham lease

Letter of credit security: Vienna Austria lease

Letter of credit security: Allston lease

Corporate credit card collateral

Total restricted cash (non-current)

As of December 31, 2019

As of December 31, 2018

$

$

264    $

250   

94   

1,144   

150   

1,902    $

264   

—   

—   

—   

100   

364   

In connection with the Company’s lease agreement for its facilities in Massachusetts and Austria, the Company maintains letters of credit, which are
secured by restricted cash, for the benefit of the landlord. In addition, as of December 31, 2019, and 2018, the Company was required to maintain a separate
cash balance of $150 thousand and $100 thousand, respectively, to collateralize corporate credit cards with a bank.

In accordance with the Company’s Amended and Restated Loan Agreement with Hercules, as further described in Note 8, the Company is required to
maintain cash in an account accessible by the lender in an amount not less than 125% of the outstanding loan balance, or if the Company’s consolidated
cash is lower than this amount, all of the Company’s cash other than $2.5 million. As of December 31, 2019, the Company maintained $25.0 million in an
account accessible by the lender in accordance with the terms of Amended and Restated Loan Agreement.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets to the sum to the
total of amounts shown in the Company’s consolidated statement of cash flows as of December 31, 2019, 2018 and 2017:

(in thousands)

Cash and cash equivalents

Restricted cash, non-current (included within other assets)

Total cash, cash equivalents and restricted cash

December 31,
2019

December 31, 2018

December 31,
2017

December 31, 2016

$

$

126,184    $

8,134    $

26,684    $

1,902   

364   

364   

128,086    $

8,498    $

27,048    $

15,160   

155   

15,315   

F-9

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Property and Equipment— Property and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization
expense is recognized using the straight-line method over the estimated useful life of each asset, as follows:

Office furniture

Computer equipment

Laboratory equipment

Leasehold improvements

Estimated Useful Life
3 years

3 years

3 to 10 years

Shorter of lease term or 10 years

Estimated useful lives are periodically assessed to determine if changes are appropriate. Maintenance and repairs are charged to expense as incurred. When
assets are retired or otherwise disposed of, the cost of these assets and related accumulated depreciation or amortization are eliminated from the
consolidated balance sheet and any resulting gains or losses are included in the consolidated statements of operations and comprehensive loss in the period
of disposal. Costs for capital assets not yet placed into service are capitalized as construction-in-progress and depreciated once placed into service.

Right-of-Use Assets and Leases— Effective January 1, 2019, the Company adopted Accounting Standards Codification (“ASC”), Topic 842, Leases
(“ASC 842”), using the modified retrospective approach through a cumulative-effect adjustment and utilizing the effective date as its date of initial
application, with prior periods unchanged and presented in accordance with the guidance in Topic 840, Leases (“ASC 840”).

At the inception of an arrangement, the Company determines whether the arrangement contains a lease based on the unique facts and circumstances
present. Leases with a non-cancellable term greater than one year are recognized on the balance sheet as right-of-use assets with associated current and
non-current lease liabilities. The Company has elected not to recognize on the balance sheet 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 lease. If a lease is
cancellable without penalty, the Company excludes from the lease term periods following the cancellation notice period unless it is reasonably certain that
the Company will not cancel the lease.

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 operating asset may be required for items such as incentives received or accrued rent. The
interest rate implicit in lease contracts is typically not readily determinable. As a result, the Company utilizes its incremental borrowing rates, which are the
rates it incurs to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. The
Company has referenced the effective rate of its Hercules borrowings, as adjusted for differences terms, to determine calculate its incremental borrowing
rate for each of its operating leases.

In accordance with the guidance in ASC 842, components of a lease are split into lease components and non-lease components. A policy election is
available pursuant to which an entity may elect to not separate lease and non-lease components. Rather, each lease component and the related non-lease
components are accounted for together as a single component. For new and amended leases beginning in 2019 and after, the Company has elected to
account for the lease and non-lease components as a combined lease component for its office and laboratory building leases.

Impairment of Long-Lived Assets— Long-lived assets consist of property and equipment. 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 in loss from operations 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. To date, the Company has not recorded any material impairment
losses on long-lived assets.

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Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Goodwill— Business combinations are accounted for under the acquisition method. The total purchase price of an acquisition is allocated to the underlying
identifiable net assets, based on their respective estimated fair values as of the acquisition date. Determining the fair value of assets acquired and liabilities
assumed requires management’s judgment and often involves the use of significant estimates and assumptions, including assumptions with respect to future
cash inflows and outflows, probabilities of success, discount rates, and asset lives, among other items. Assets acquired and liabilities assumed are recorded
at their estimated fair values. The excess of the purchase price over the estimated fair values of the net assets acquired is recorded as goodwill.

Goodwill is tested quantitatively for impairment at the reporting unit level annually in the fourth quarter, or more frequently when events or changes in
circumstances indicate that the asset might be impaired. Examples of such events or circumstances include, but are not limited to, a significant adverse
change in legal or business climate, an adverse regulatory action or unanticipated competition.

The Company has determined that it operates in a single operating segment and has a single reporting unit. To perform its quantitative test, the Company
compares the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds the carrying value of its net assets, goodwill
is not impaired, and no further testing is required. If the fair value of the reporting unit is less than the carrying value, the Company measures the amount of
impairment loss, if any, as the excess of the carrying value over the fair value of the reporting unit. The Company determined that goodwill was not
impaired as of December 31, 2019 base on its quantitative test.

Intangible Assets— In connection with the Merger, the Company acquired certain in-process research and development ("IPR&D") assets, which were
classified as indefinite-lived intangible assets. Acquired IPR&D represents the fair value assigned to research and development assets that the Company
acquires and have not been completed at the acquisition date. The fair value of IPR&D acquired in a business combination is recorded on the Company’s
consolidated balance sheets at the acquisition-date fair value and is determined by estimating the costs to develop the technology into commercially viable
products, estimating the resulting revenue from the projects, and discounting the projected net cash flows to present value. IPR&D is not amortized, but
rather is reviewed for impairment on an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned
or transferred to a third party.

The projected discounted cash flow models used to estimate the Company’s IPR&D reflect significant assumptions regarding the estimates a market
participant would make in order to evaluate a drug development asset, including the following:

•

Probability of successfully completing clinical trials and obtaining regulatory approval;

• Market size, market growth projections, and market share;

•

Estimates of future cash flows from potential milestone payments and royalties related to out-licensed product sales; and

• A discount rate reflecting the Company's weighted average cost of capital and specific risk inherent in the underlying assets.

During the year ended December 31, 2019, the Company entered into an out-licensing arrangement with a third party that transferred the rights to develop
and commercialize one of the programs underlying an IPR&D intangible asset. In addition, the Company entered into amended out-licensing option
agreements with a third party who had previously entered into an option agreement with Arsanis to license the rights to develop and commercialize two
other programs underlying the IPR&D intangible assets. Following the amendment to these option agreements, the options were exercised by the third
party and the in-process research and development programs were out-licensed to the third party. As of December 31, 2019, all programs underlying
IPR&D intangible assets acquired in the Merger were transferred to these third parties and the Company has no continuing involvement in any ongoing
research and development activities associated with the programs. As a result of the transfer of the IPR&D projects to third parties, the Company
derecognized the IPR&D intangibles asset through a charge to "loss on transfer of nonfinancial assets" during 2019. (See Note 16)

Deferred Rent— The Company’s lease agreements include payment escalations and lease incentives (including a leasehold improvement tenant
allowance). For periods prior to January 1, 2019, these payments were accrued or deferred as appropriate such that rent expense was recognized on a
straight-line basis over the respective lease terms. Effective January 1, 2019, upon the adoption of ASC 842, deferred rent was reclassified as a reduction to
the applicable right-of-use asset as further described in Note 9.

F-11

Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Fair Value Measurements— Certain assets and liabilities of the Company 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 that are significant to determining the fair value of
the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

Prior to the Merger, the Company’s preferred stock warrant liability, derivative liability and preferred stock repurchase liability were carried at fair value,
determined according to Level 3 inputs in the fair value hierarchy described above (see Note 5). The Company’s cash equivalents, consisting of money
market funds invested in U.S. Treasury securities, are carried at fair value, determined based on Level 1 and Level 2 inputs in the fair value hierarchy
described above. 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. The carrying value of the Company’s outstanding loan and security agreement with Hercules approximates its fair value at
December 31, 2019 because the debt bears interest at a variable market rate and the Company’s credit risk has not materially changed since the inception of
the agreement.

Segment Information— The Company manages its operations as a single operating segment for the purposes of assessing performance and making
operating decisions. The Company’s focus is on the research, development and commercialization of novel therapeutics for the treatment of rare diseases.

Revenue Recognition— Effective January 1, 2018, the Company adopted ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”), as
amended, using the modified retrospective transition method. The modified retrospective method requires that the cumulative effect of initially applying
ASC 606 be recognized as an adjustment to the opening balance of retained earnings or accumulated deficit of the annual period that includes the date of
initial application. The Company had no arrangements that were in the scope of ASC 606 on January 1, 2018 and thus there was no impact to the
consolidated financial statements as a result of the adoption. This standard applies to all contracts with customers, except for contracts that are within the
scope of other standards, such as collaboration arrangements and leases.

The Company’s revenues are generated primarily through research, development and commercialization agreements. The terms of these agreements may
contain multiple promised goods and services, which may include (i) licenses, or options to obtain licenses, to the Company’s technology, and (ii) in certain
cases, services in connection with the manufacturing of preclinical and clinical materials. Payments to the Company under these arrangements typically
include one or more of the following: non-refundable, upfront license fees; option exercise fees; milestone payments; payments for clinical and commercial
product supply, and royalties on future product sales. To date, all revenue from these agreements has been fully constrained and, therefore, no revenue has
been recognized on the consolidated statements of operations.

The Company analyzes its arrangements to assess whether such arrangements involve joint operating activities performed by parties that are both active
participants in the activities and exposed to significant risks and rewards dependent on the commercial success of such activities and are therefore within
the scope of ASC Topic 808, Collaborative Arrangements (“ASC 808”). This assessment is performed throughout the life of the arrangement based on
changes in the responsibilities of all parties in the arrangement. For collaboration arrangements that are deemed to be within the scope of ASC 808, the
Company first determines which elements of the collaboration are deemed to be within the scope of ASC 808 and those that are more reflective of a
vendor-customer relationship and, therefore, within the scope of ASC 606. The Company’s policy is generally to recognize amounts received from
collaborators in connection with joint operating activities that are within the scope of ASC 808 as a reduction in research and development expense. To
date, there have been no transactions within the scope of ASC 808.

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Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Under ASC 606, the Company recognizes revenue when its customers obtain control of promised goods or services, in an amount that reflects the
consideration which the Company determines it expects to receive in exchange for those goods or services. To determine revenue recognition for
arrangements that the Company determines are within the scope of ASC 606, the Company performs the following five steps: (1) identify the contract(s)
with a customer; (2) identify the performance obligation(s) in the contract; (3) determine the transaction price; (4) allocate the transaction price to the
performance obligation(s) in the contract; and (5) recognize revenue when (or as) the Company satisfies its performance obligation(s).

As part of the accounting for these arrangements, the Company must make significant judgments, including identifying performance obligations in the
contract, estimating the amount of variable consideration to include in the transaction price and; allocating the transaction price to each performance
obligation.

Once a contract is determined to be within the scope of ASC 606, the Company assesses the goods or services promised within the contract and determines
those that are performance obligations. Arrangements that include rights to additional goods or services that are exercisable at a customer’s discretion are
generally considered options. The Company assesses if these options provide a material right to the customer and if so, they are considered performance
obligations.

The Company assesses whether each promised good or service is distinct for the purpose of identifying the performance obligations in the contract. This
assessment involves subjective determinations and requires management to make judgments about the individual promised goods or services and whether
such are separable from the other aspects of the contractual relationship. Promised goods and services are considered distinct provided that:

i.

ii.

the customer can benefit from the good or service either on its own or together with other resources that are readily available to the customer
(that is, the good or service is capable of being distinct) and
the entity’s promise to transfer the good or service to the customer is separately identifiable from other promises in the contract (that is, the
promise to transfer the good or service is distinct within the context of the contract).

In assessing whether a promised good or service is distinct, the Company considers factors such as the research, manufacturing and commercialization
capabilities of the customer and the availability of the associated expertise in the general marketplace. The Company also considers the intended benefit of
the contract in assessing whether a promised good or service is separately identifiable from other promises in the contract. If a promised good or service is
not distinct, an entity is required to combine that good or service with other promised goods or services until it identifies a bundle of goods or services that
is distinct.

The transaction price is then determined and allocated to the identified performance obligations in proportion to their standalone selling prices (“SSP”) on a
relative SSP basis. SSP is determined at contract inception and is not updated to reflect changes between contract inception and when the performance
obligations are satisfied. Determining the SSP for performance obligations requires significant judgment. In developing the SSP for a performance
obligation, the Company considers applicable market conditions and relevant entity-specific factors, including factors that were contemplated in
negotiating the agreement with the customer and estimated costs. The Company validates the SSP for performance obligations by evaluating whether
changes in the key assumptions used to determine the SSP will have a significant effect on the allocation of arrangement consideration between multiple
performance obligations.

If the consideration promised in a contract includes a variable amount, the Company estimates the amount of consideration to which it will be entitled in
exchange for transferring the promised goods or services to a customer. The Company determines the amount of variable consideration by using either the
expected value method or the most-likely-amount method. The Company includes the unconstrained amount of estimated variable consideration in the
transaction price. The amount included in the transaction price reflects the amount for which it is probable that a significant reversal of cumulative revenue
recognized will not occur. At the end of each subsequent reporting period, the Company re-evaluates the estimated variable consideration included in the
transaction price and any related constraint, and if necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a
cumulative catch-up basis in the period of adjustment.

In determining the transaction price, the Company adjusts consideration for the effects of the time value of money if the timing of payments provides the
Company with a significant benefit of financing. The Company does not assess whether a contract has a significant financing component if the expectation
at contract inception is such that the period between payment by the licensees and the transfer of the promised goods or services to the licensees will be one
year or less. The Company assesses each of its revenue generating arrangements in order to determine whether a significant financing component exists and
concluded that a significant financing component does not exist in any of its arrangements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The Company then recognizes as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) each
performance obligation is satisfied at a point in time or over time, and if over time based on the use of an output or input method.

At the inception of each arrangement that includes non-refundable payments for contingent milestones, including preclinical research and development,
clinical development and regulatory, the Company evaluates whether the milestones are considered probable of being achieved and estimates the amount to
be included in the transaction price using the most-likely-amount method. If it is probable that a significant revenue reversal would not occur, the
associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company or the licensee, such as
regulatory approvals, are not considered probable of being achieved until those approvals are received. At the end of each reporting period, the Company
re-evaluates the probability of the achievement of contingent milestones and the likelihood of a significant reversal of such milestone revenue, and if
necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect
licensing revenue in the period of adjustment. This quarterly assessment may result in the recognition of revenue related to a contingent milestone payment
before the milestone event has been achieved.

Research and Development Programs— Proceeds under the research and development incentive program from the Austrian government are recognized as
other income in an amount equal to the qualifying expenses incurred in each period multiplied by the applicable reimbursement percentage. Incentive
income recognized upon incurring qualifying expenses in advance of receipt of proceeds from research and development incentives is recorded in the
consolidated balance sheet as research and development incentive receivable.

Research and Development Costs— Costs associated with internal research and development and external research and development services, including
drug development and preclinical studies, are expensed as incurred. Research and development expenses include costs for salaries, employee benefits,
subcontractors, facility-related expenses, depreciation and amortization, stock-based compensation, third-party license fees, laboratory supplies, and
external costs of outside vendors engaged to conduct discovery, preclinical and clinical development activities and clinical trials as well as to manufacture
clinical trial materials, and other costs. The Company recognizes external research and development costs based on an evaluation of the progress to
completion of specific tasks using information provided to the Company by its service providers.

Nonrefundable advance payments for services to be received in the future for use in research and development activities are recorded as prepaid expenses.
Such prepaid expenses are recognized as an expense when the related services have been performed, or when it is no longer expected that the goods will be
delivered or the services rendered.

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.

Debt Issuance Costs— Debt issuance costs consist of payments made to secure commitments under certain debt financing arrangements. These amounts
are recognized as interest expense over the period of the financing arrangement using the effective interest method. If the financing arrangement is canceled
or forfeited, or if the utility of the arrangement to the Company is otherwise compromised, these costs are recognized as interest expense immediately. The
Company’s consolidated financial statements present debt issuance costs related to a recognized debt liability as a direct reduction from the carrying
amount of that debt liability.

Stock-Based Compensation— The Company measures all stock-based awards granted to employees and directors based on the fair value on the date of the
grant and recognizes compensation expense for those awards, net of estimated forfeitures, over the requisite service period, which is generally the vesting
period of the respective award. The Company issues stock-based awards with service-based vesting conditions and records the expense for these awards
using the straight-line method. The Company has not issued any stock-based awards with performance-based vesting conditions.

Effective January 1, 2019, the Company adopted ASU No. 2018-7, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee
Share-Based Payment Accounting (“ASU 2018-7”), which expands the scope of Topic 718 to include share-based payment awards to nonemployees. As a
result, stock-based awards granted to non-employees are accounted for in the same manner as awards granted to employees and directors as described
above. The impact of adopting this new guidance did not have a material impact on the Company’s consolidated financial statements. Prior to the adoption
of ASU 2018-7, for stock-based awards granted to non-employee consultants, compensation expense was recognized over the period

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

during which services were rendered by such nonemployee consultants until completed. At the end of each financial reporting period prior to completion of
the service, the fair value of these awards was remeasured using the then-current fair value of the Company’s common stock and updated assumption inputs
in the Black-Scholes option-pricing model.

The Company classifies stock-based compensation expense in its consolidated statement 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.

The Company recognizes compensation expense for only the portion of awards that are expected to vest. In developing a forfeiture rate estimate, the
Company has considered its historical experience to estimate pre-vesting forfeitures for service-based awards. The impact of a forfeiture rate adjustment is
recognized in full in the period of adjustment, and if the actual forfeiture rate is materially different from the Company’s estimate, the Company may be
required to record adjustments to stock-based compensation expense in future periods.

The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model. Prior to March 13, 2019, the
Company had been a private company and lacked company-specific historical and implied volatility information for its common stock. Therefore, the
Company estimates its expected common stock price volatility based on the historical volatility of publicly traded peer companies and expects to continue
to do so until it has adequate historical data regarding the volatility of its own traded stock price. The expected term of the Company’s stock options has
been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-
employee consultants is equal to the contractual term of the option award. 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 considers
the fact that the Company has never paid cash dividends on common stock and does not expect to pay any cash dividends in the foreseeable future.

Preferred Stock Warrant Liability— Prior to the Merger with Arsanis, the Company classified warrants for the purchase of shares of its convertible
preferred stock (see Note 11) as a liability on its consolidated balance sheets as these warrants are freestanding financial instruments that may have required
the Company to transfer assets upon exercise. The warrant liability, which consisted of warrants for the purchase of Series A and Series B convertible
preferred stock, was initially recorded at fair value upon the date of issuance of each warrant and was subsequently remeasured to fair value at each
reporting date. Changes in the fair value of the preferred stock warrant liability are recognized as a component of other income (expense), net in the
consolidated statement of operations and comprehensive loss. Concurrent with the closing of the Merger, all X4 preferred stock was converted to common
stock and the X4 preferred stock warrants converted to warrants for the purchase of Arsanis common stock. The Company assessed the features of the
warrants and determined that they qualify for classification as permanent equity. Accordingly, the Company remeasured the warrants to fair value upon the
closing of the Merger and reclassified the resulting warrant liability to additional paid-in capital.

Derivative Liabilities: Genzyme Contingent Payment— The Company’s license agreement with Genzyme Corporation (“Genzyme”) (see Note 4) contains
a contingent payment obligation that required the Company to make a cash payment to Genzyme upon a change of control event of the Company. The
contingent payment obligation met the definition of a derivative instrument as the contingent payment obligation was not clearly and closely related to its
host instrument and was a cash-settled liability. Accordingly, the Company classified this derivative as a liability within other liabilities (non-current) on its
consolidated balance sheet. The derivative liability was initially recorded at fair value on the date of entering into the license agreement and was
subsequently remeasured to fair value at each reporting date. Changes in the fair value of this derivative liability were recognized as a component of other
income (expense), net in the consolidated statement of operations and comprehensive loss. The Merger with Arsanis (see Note 1) qualified as a change of
control event, as defined in the license agreement, but resulted in no payment being due to Genzyme under the license agreement. As a result, on March 13,
2019, the closing date of the Merger with Arsanis, the derivative liability was remeasured to fair value, which was $0, and subsequent changes in fair value
will no longer be recognized in the consolidated statements of operations because the contingent payment obligation to Genzyme expired at that time.

Derivative Liabilities: Hercules Loan Redemption Feature— The Company’s Hercules loan (see Note 8) contains a redemption feature that, upon an
event of default, provides Hercules the option to accelerate and demand repayment of the debt, including a prepayment premium. The redemption feature
meets the definition of a derivative instrument as the repayment of the debt contains a substantial premium, resulting in the redemption feature not being
clearly and closely related to its host instrument. Accordingly, the Company classifies this derivative as a liability within other liabilities (non-current) on
its consolidated balance

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

sheets. The derivative liability was initially recorded at fair value on the date of the Hercules Loan Agreement and is subsequently remeasured to fair value
at each reporting date. Changes in the fair value of this derivative liability, which is included in other liabilities, are recognized as a component of other
income (expense), net in the consolidated statement of operations and comprehensive loss. Changes in the fair value of this derivative liability will continue
to be recognized until all amounts outstanding under the Hercules Loan Agreement are repaid or until the Hercules Loan Agreement is terminated. During
the year ended December 31, 2019, there were no changes to the fair value of this liability.

Comprehensive Loss— Comprehensive loss includes net loss as well as foreign currency translation adjustments. For the year ended December 31, 2019,
comprehensive loss includes $119 thousand of foreign currency translation adjustments.

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 based on the difference between the financial statement 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.

Net Loss per Share— For periods prior to the Merger with Arsanis on March 13, 2019, the Company followed the two-class method when computing net
loss per share as the Company had issued shares that met the definition of participating securities. The two-class method determines net 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.

Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted
average number of shares of common stock outstanding for the period. Basic shares outstanding includes the weighted average effect of the Company’s
outstanding prefunded warrants, the exercise of which requires little or no consideration for the delivery of shares of common stock. Diluted net loss
attributable to common stockholders is computed by adjusting net loss attributable to common stockholders to reallocate undistributed earnings based on
the potential impact of dilutive securities. Diluted net loss per share attributable to common stockholders is computed by dividing the diluted net loss
attributable to common stockholders by the weighted average number of shares of common stock outstanding for the period, including potential dilutive
shares of common stock. For purpose of this calculation, outstanding stock options, convertible preferred stock and warrants to purchase shares of
convertible preferred stock or common stock are considered potential dilutive shares of common stock.

The Company’s convertible preferred stock contractually entitled the holders of such shares to participate in dividends but did not contractually require the
holders of such shares to participate in losses of the Company. Accordingly, in periods in which the Company reports a net loss attributable to common
stockholders, such losses are not allocated to such participating securities. In periods in which the Company reports a net loss attributable to common
stockholders, diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders,
since dilutive shares of common stock are not assumed to have been issued if their effect is anti-dilutive. The Company reported a net loss attributable to
common stockholders for the years ended December 31, 2019, 2018 and 2017.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Recently Adopted Accounting Pronouncements
In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-2, Leases (Topic 842) (“ASU 2016-2” or “ASC 842”)),
which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors).
The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not
the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective
interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases
with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less may be accounted for similar to prior
guidance for operating leases. The Company adopted the new lease standard as of the required effective date of January 1, 2019 using a modified
retrospective transition approach applied to leases existing as of, or entered into after, January 1, 2019. The adoption had no impact on accumulated deficit.
The new lease standard provides a number of optional practical expedients in transition. The Company applied the package of practical expedients to leases
that commenced prior to the effective date, whereby it will elect to not reassess the following: (i) whether any expired or existing contracts contain leases;
(ii) the lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The Company also elected the short-term
lease recognition exemption for all leases that qualify, where a right-of-use asset or lease liability will not be recognized for short-term leases. Upon the
adoption of ASC 842, the Company recorded $2.5 million of operating lease liabilities and $2.0 million of operating lease right-of-use assets on its
consolidated balance sheets. The adoption did not have a material impact on the Company’s consolidated statement of operations and comprehensive loss
or statement of cash flows.

In January 2017, the FASB issued ASU No. 2017-4, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new
standard simplifies the subsequent measurement of goodwill by eliminating the second step of the goodwill impairment test. This ASU will be applied
prospectively and is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019 with early adoption
permitted. The Company adopted this guidance on January 1, 2019 and applied it to its annual impairment test for the year ending December 31, 2019. The
adoption of this guidance did not have an impact on the Company's consolidated financial statements.

In April 2017, the FASB issued ASU 2017-8, Receivables – Nonrefundable Fees and Other Costs (“Subtopic 310-20”). The new standard amends the
amortization period for certain purchased callable debt securities held at a premium by shortening the amortization period for the premium to the earliest
call date. Subtopic 310-20 calls for a modified retrospective application under which a cumulative-effect adjustment will be made to retained earnings as of
the beginning of the first reporting period in which the guidance is adopted. The Company adopted this guidance, effective January 1, 2019, and the
adoption of this guidance did not have an impact on the Company's consolidated financial statements and related disclosures.

In July 2017, the FASB issued ASU No. 2017-11, Earnings Per Share (Topic 260), Distinguishing Liabilities from Equity (Topic 480), Derivatives and
Hedging (Topic 815) (Part I) Accounting for Certain Financial Instruments with Down Round Features (Part II) Replacement of the Indefinite Deferral for
Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope
Exception (“ASU 2017-11”). Part I applies to entities that issue financial instruments such as warrants, convertible debt or convertible preferred stock that
contain down-round features. Part II replaces the indefinite deferral for certain mandatorily redeemable noncontrolling interests and mandatorily
redeemable financial instruments of nonpublic entities contained within ASC Topic 480 with a scope exception and does not impact the accounting for
these mandatorily redeemable instruments. For public entities, ASU 2017-11 is effective for annual reporting periods beginning after December 15, 2018,
including interim periods within those fiscal years. The Company adopted ASU 2017-11 as of the required effective date of January 1, 2019. The
provisions of the new guidance related to accounting for financial instruments with down round features was taken into account by the Company in its
evaluation of whether the Class B warrants issued in the November 2019 sale of common stock required liability classification. See Note 12.

In June 2018, the FASB issued ASU 2018-7, which superseded Subtopic 505-50, Equity—Equity-Based Payments to Non-Employees and amends ASC 718
to include share-based payments issued to non-employees for goods or services. Consequently, the accounting for share-based payments to non-employees
and employees will be substantially aligned. The Company adopted ASU 2018-7 on January 1, 2019 and the adoption of this guidance did not have an
impact on the Company's consolidated financial statements and related disclosures.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Recently Issued Accounting Pronouncements

In November 2018, the FASB issued ASU 2018-18, Clarifying the Interaction between Topic 808 and Topic 606 (“ASU 2018-18”). ASU 2018-18 clarifies
the interaction between the accounting guidance for collaborative arrangements and revenue from contracts with customers. The amendments become
effective January 1, 2020 and were adopted by the Company retrospectively as of January 1, 2018, the date the Company adopted the new revenue
guidance under ASC 606. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements and related
disclosures.

In June 2016, the FASB issued ASU 2016-13, Credit Losses (Topic 326) ("ASU 2016-13"). ASU 2016-13 requires that financial assets measured at
amortized cost, such as trade receivables, be presented net of expected credit losses, which may be estimated based on relevant information such as
historical experience, current conditions, and future expectation for each pool of similar financial asset. The new guidance requires enhanced disclosures
related to trade receivables and associated credit losses. The Company adopted this guidance on January 1, 2020. The adoption of ASU 2016-13 is not
expected to have a material impact on the Company's consolidated financial statements and related disclosures.

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, (“ASU 2018-15”). The amendments in this update 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
accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The new standard
will be effective beginning January 1, 2020 and was adopted by the Company on that date. The adoption of ASU 2018-15 is not expected to have a material
impact on the Company's consolidated financial statements and related disclosures.

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 (“ASU 2018-13”), which removes, adds and modifies certain disclosure requirements for fair value
measurements in Topic 820. The Company will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of
the fair value hierarchy as well as the valuation processes of Level 3 fair value measurements. The Company will be required to provide additional
disclosure related to the changes in unrealized gains and losses included in other comprehensive loss for recurring Level 3 fair value measurements and the
range and weighted average of assumptions used to develop significant unobservable inputs for Level 3 fair value measurements. ASU 2018-13 is effective
for the Company on January 1, 2020 and was adopted on that date. The adoption of ASU 2018-13 is not expected to have an impact on the Company's
consolidated financial statements and related disclosures.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes ("ASU 2019-12"). ASU 2019-12 simplifies the
accounting for income taxes, including the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for
outside basis differences. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years.
The Company does not anticipate that the adoption of ASU 2019-12 will have a material impact on its consolidated financial statements and related
disclosures.

3. Merger Accounting

On March 13, 2019, the Company completed its merger with Arsanis. Based on the Exchange Ratio of 0.5702 , immediately following the Merger, former
Arsanis stockholders, Arsanis option holders and other persons holding securities or other rights directly or indirectly convertible, exercisable or
exchangeable for Arsanis common stock owned approximately 32.9% of the outstanding capital stock of the combined organization on a fully diluted basis,
and former X4 stockholders, holders of options or warrants to acquire X4 capital stock and other persons holding securities and other rights directly or
indirectly convertible, exercisable or exchangeable for X4 capital stock owned approximately 67.1% of the outstanding capital stock of the combined
organization on a fully diluted basis. At the closing of the Merger, all shares of X4 common stock and X4 preferred stock then outstanding were exchanged
for Arsanis common stock.

In addition, pursuant to the terms of the Merger Agreement, the Company, for accounting purposes, assumed all outstanding stock options to purchase
shares of Arsanis common stock at the closing of the Merger. At the closing of the Merger, such stock options became options to purchase an aggregate of
271,230 shares of the Company’s common stock after giving effect to the Reverse Stock Split.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The total purchase price paid in the Merger has been allocated to the tangible and intangible assets acquired and liabilities assumed of Arsanis based on
their fair values as of the completion of the Merger, with the excess allocated to goodwill. The following summarizes the preliminary estimate of the
purchase price paid in the Merger (in thousands, except share and per share amounts):

Number of shares of the combined organization owned by Arsanis stockholders (1)

Multiplied by the fair value per share of Arsanis common stock (2)

Fair value of consideration issued it effect the Merger

Fair value of replacement awards held by former employees, board of directors and consultants of Arsanis that were vested as of

the Merger.
Purchase price:

2,440,582   

18.66   

45,541   

817   

46,358   

$

$

$

________________________

(1) The number of shares of 2,440,582 represents the historical 14,643,737 shares of Arsanis common stock outstanding immediately prior to the

closing of the Merger, adjusted for the Reverse Stock Split.

(2) Based on the last reported sale price of Arsanis common stock on the Nasdaq Global Market on March 13, 2019, the closing date of the Merger, and

gives effect to the Reverse Stock Split.

The following summarizes the allocation of the purchase price to the net tangible and intangible assets acquired (in thousands):

Cash, cash equivalents and restricted cash

Other current assets

Property and equipment, net

IPR&D indefinite-lived intangible assets

Other assets, non-current

Current liabilities

Loans payable

Other liabilities, non-current

Goodwill

Purchase price

$

$

26,406   

2,147   

68   

4,900   

486   

(5,205)  

(8,713)  

(840)  

27,109   

46,358   

The goodwill of $27.1 million is not tax deductible and represents the excess of the consideration paid over the fair value of assets acquired and liabilities
assumed. Goodwill is mainly attributable to the enhanced value of the combined company, as reflected in the increase in market value of the shares of
Arsanis common stock following the announcement of the Merger with X4. During the quarter ended June 30, 2019, goodwill was adjusted by
$298 thousand to reflect a change in the allocation of purchase price to the fair value of an acquired operating lease as of March 13, 2019. There have been
no other changes in the value of goodwill from the acquisition date to December 31, 2019, and goodwill was not impaired as of December 31, 2019 based
on management's annual quantitative impairment test.

The Company incurred costs directly related to the Merger of approximately $1 million, which were recorded in general and administrative expenses, for
the twelve months ended December 31, 2019.

The in-process research and development intangible assets represent the acquisition-date fair value of three development programs acquired from Arsanis,
which the Company refers to as the ASN200, ASN300 and ASN500 programs. The fair value of the IPR&D intangible assets was based on assumptions
that market participants would use in pricing the assets, based on the most advantageous market for the assets assuming highest and best use. The fair value
was determined by estimating the resulting revenue from out-license arrangements related to the projects, and discounting the projected net cash flows to
present value using a weighted average discount rate of 20%. These IPR&D intangible assets are not amortized, but rather are reviewed for impairment on
an annual basis or more frequently if indicators of impairment are present, until the project is completed, abandoned or transferred to a third party. As
further described in Note 16, during the year ended December 31, 2019, the Company entered into arrangements with two third parties that transferred the
rights to develop and commercialize the programs underlying the IPR&D intangible assets. Accordingly, the Company derecognized the IPR&D intangible
assets through a charge to "loss on transfer of nonfinancial assets" during the year ended December 31, 2019.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following supplemental pro forma information presents the Company’s financial results as if the acquisition of Arsanis had occurred on January 1,
2018 (unaudited)

(in thousands)
Revenue

Net loss

Year Ended
December 31,

2019

2018

$

$

—    $

(57,820)  $

3,500   

(76,248) 

The above unaudited pro forma information was determined based on the historical GAAP results of the Company and Arsanis. The pro forma
consolidated results are not necessarily indicative of what the Company’s consolidated results of operations would have been if the acquisition was
completed on January 1, 2018. The pro forma consolidated net loss includes pro forma adjustments primarily relating to the reclassification of transaction
costs and severance payments directly related to the closing of the Merger of $2.7 million from the twelve months ended December 31, 2019 to the twelve
months ended December 31, 2018.

4. License, Collaboration, and Funding Agreements

Genzyme Agreement
In July 2014, the Company entered into a license agreement (the “Genzyme Agreement”) with Genzyme pursuant to which the Company was granted an
exclusive license to certain patents and intellectual property owned or controlled by Genzyme related to the CXCR4 receptor to develop and commercialize
products containing licensed compounds (including but not limited to mavorixafor) for all therapeutic, prophylactic and diagnostic uses, with the exception
of autologous and allogenic human stem cell therapy. Under the terms of the Genzyme Agreement, the Company is obligated to use commercially
reasonable efforts to develop and commercialize licensed products for use in the field in the United States and at least one other major market country. The
Company has the right to grant sublicenses of the licensed rights that cover mavorixafor to third parties.

In exchange for these rights, in August 2014, the Company made an upfront payment of $50 thousand to Genzyme. 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 upfront payment as
research and development expense in the consolidated statement of operations and comprehensive loss because the acquired technology represented in-
process research and development and had no alternative future use. In August 2015, as a result of the closing of the Company’s Series A preferred stock
financing, the Company made an additional cash payment of $300 thousand to Genzyme and issued to Genzyme 107,371 shares of its common stock, as
adjusted for the 1-for-6 Reverse Stock Split and Exchange Ratio, each as required by the Genzyme Agreement. The $300 thousand payment and the
$734 thousand fair value of the 107,371 shares of common stock issued to Genzyme were recorded as research and development expense in the
consolidated statements of operations and comprehensive loss for the year ended December 31, 2015. Prior to the Merger with Arsanis, Genzyme had the
right to require the Company to repurchase all, but not less than all, of these shares of common stock at any time during the term of the Genzyme
Agreement for a price of $0.01 per share. Due to this redemption feature, the shares of common stock issued to Genzyme were classified outside of
stockholders’ deficit on the consolidated balance sheets as of December 31, 2018. On March 13, 2019, the closing date of the Merger with Arsanis, these
redeemable shares of common stock were exchanged for shares of common stock and, as a result, the fair value of the shares was reclassified to permanent
equity.

Under the Genzyme Agreement, the Company is obligated to pay Genzyme milestone payments in the aggregate amount of up to $25.0 million, contingent
upon the achievement by the Company of certain clinical-stage regulatory and sales milestones with respect to licensed products. The Company is also
obligated to pay Genzyme tiered royalties based on net sales of licensed products that the Company commercializes under the agreement. The obligation to
pay royalties for each licensed product expires on a country-by-country basis on the latest of (i) the expiration of licensed patent rights that cover that
licensed product in that country, (ii) the expiration of regulatory exclusivity in that country and (iii) ten years after the first commercial sale of such licensed
product in that country. Royalty rates are subject to reduction under the agreement in specified circumstances, including in any country if the Company is
required to obtain a license from any third party to the extent the Company’s patent rights might infringe the third party’s patent rights, if a licensed product
is not covered by a valid claim in that country or if sales of generic products reach certain thresholds in that country. If the Company enters into a
sublicense under the Genzyme Agreement, the Company will be obligated to pay Genzyme a percentage of certain upfront fees, maintenance fees,
milestone payments and royalty payments paid to the Company by the sublicensee.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Under the Genzyme Agreement, the Company will itself manufacture and supply, or enter into manufacturing or supply agreements with Genzyme or third
parties to manufacture and supply, clinical and commercial supplies of licensed compounds and each licensed product. The Company is also responsible for
all costs related to the filing, prosecution and maintenance of the licensed patent rights.

The Genzyme Agreement will remain in effect until the expiration of the royalty term in all countries for all licensed products. The Genzyme Agreement
may be terminated by either party with at least 90 days’ notice in the event of material breach by the other party that remains uncured for 90 days, by either
party for insolvency or bankruptcy of the other party, immediately by Genzyme if the Company challenges the licensed patents, or immediately by the
Company if a material safety issue arises.

During the twelve months ended December 31, 2019, 2018 and 2017, the Company did not incur any payment obligations to Genzyme under the Genzyme
Agreement.

Georgetown Agreement
In December 2016, the Company entered into a license agreement (the “Georgetown Agreement”) with Georgetown University (“Georgetown”) pursuant
to which the Company obtained an exclusive, worldwide license to make, have made, use, sell, offer for sale and import of products covered by patent
rights co-owned by Georgetown. The rights licensed to the Company are for all therapeutic, prophylactic and diagnostic uses in all disease indications in
humans and animals.

Under the terms of the Georgetown Agreement, the Company paid a one-time only, upfront fee of $50 thousand and the Company may be required to make
milestone payments of up to an aggregate of $800 thousand related to commercial sales of a product. The Company recorded the upfront payment as
research and development expense in the consolidated statement of operations and comprehensive loss because the acquired technology represented in-
process research and development and had no alternative future use.

Under the Georgetown Agreement, the Company is solely responsible for all development and commercialization activities and costs in its respective
territories. The Company is also responsible for all costs related to the filing, prosecution and maintenance of the licensed patent rights.

The term of the Georgetown Agreement will continue until the expiration of the last valid claim within the patent rights covering the product. Georgetown
may terminate the agreement in the event (i) the Company fails to pay any amount and fails to cure such failure within 30 days after receipt of notice,
(ii) the Company defaults in its obligation to obtain and maintain insurance and fails to remedy such breach within 45 days after receipt of notice, or
(iii) the Company declares insolvency or bankruptcy. The Company may terminate the Georgetown Agreement at any time upon at least 60 days’ written
notice.

During the twelve months ended December 31, 2019, 2018 and 2017, the Company did not incur any payment obligations to Georgetown under the
Georgetown Agreement and no milestone payments were made or due under the Georgetown Agreement.

Beth Israel Deaconess Medical Center Agreement
In December 2016, the Company entered into a license agreement (the “BIDMC Agreement”) with Beth Israel Deaconess Medical Center (“BIDMC”),
pursuant to which the Company obtained an exclusive, worldwide license to make, have made, use, sell, offer for sale and import products covered by
patent rights co-owned by BIDMC. The rights licensed to the Company are for all fields of use.

Under the terms of the BIDMC Agreement, the Company paid a one-time, upfront fee of $20 thousand and the Company is responsible for all future patent
prosecution costs. The Company recorded the upfront payment as research and development expense in the consolidated statement of operations because
the acquired technology represented in-process research and development and had no alternative future use.

The term of the BIDMC Agreement will continue until the expiration of the last valid claim within the patent rights covering the licensed products. BIDMC
may terminate the agreement in the event (i) the Company fails to pay any amount and fails to cure such failure within 15 days after receipt of notice,
(ii) the Company is in material breach of any material provision of the BIDMC Agreement and fails to remedy such breach within 60 days after receipt of
notice, or (iii) the Company declares insolvency or bankruptcy. The Company may terminate the BIDMC Agreement at any time upon at least 90 days’
written notice.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The Company did not incur any payment obligations under the BIDMC Agreement during the twelve months ended December 31, 2019, 2018 and 2017.

Research and Development Incentive Program
The Company's wholly-owned subsidiary X4 GmbH, which was acquired in March 2019 in the Merger, participates in a research and development
incentive program provided by the Austrian government whereby the Company is entitled to reimbursement by the Austrian government for a percentage
of qualifying research and development expenses incurred by the Company’s subsidiary in Austria. Under the program, the reimbursement rate for
qualifying research and development expenses incurred by the Company through its subsidiary in Austria is 14% for the current year.

The Company recognizes incentive income from Austrian research and development incentives when qualifying expenses have been incurred, there is
reasonable assurance that the payment will be received, and the consideration can be reliably measured. Management has assessed the Company’s research
and development activities and expenditures to determine which activities and expenditures are likely to be eligible under the research and development
incentive program described above. At each reporting date, management estimates the reimbursable incentive income available to the Company based on
available information at the time.

As of December 31, 2019, the amount due under the program was $2.0 million, which is included in research and development incentive receivable in the
consolidated balance sheet and of which $1.5 million was collected in the first quarter of 2020. During the year ended December 31, 2019, the Company
recorded $446 thousand of income related to the program on the consolidated statement of operations and comprehensive loss within "other income".

Abbisko Agreement
In July 2019, the Company entered into a license agreement (the “Abbisko Agreement”) with Abbisko Therapeutics Co., Ltd. (“Abbisko”). Under the terms
of the Abbisko Agreement, the Company granted Abbisko the exclusive right to develop, manufacture and commercialize mavorixafor in mainland China,
Taiwan, Hong Kong and Macau (referred to in the Abbisko Agreement as the “Abbisko Territory”). The agreement provides Abbisko with the exclusive
rights in the Abbisko Territory to develop and commercialize mavorixafor in combination with checkpoint inhibitors or other agents in multiple oncology
indications. Pancreatic cancer, ovarian cancer and triple negative breast cancer will be explored initially. The Company retains the full rest-of-world rights
to develop and commercialize mavorixafor outside of Greater China for all indications and the ability to utilize data generated pursuant to the Abbisko
collaboration for rest-of-world development. In addition, Abbisko has the right of first refusal if the Company determines to pursue additional products in
the Abbisko Territory. In accordance with the Abbisko Agreement, the Company has agreed to enter into separate agreements whereby the Company would
provide Abbisko with a clinical supply and, if the product is commercialized in the Abbisko Territory, a commercial supply of the licensed compound.

Pursuant to the Abbisko Agreement, upon the closing of a qualified financing (as defined in the Abbisko Agreement), Abbisko will make a one-time, non-
refundable, non-creditable financial milestone payment in the low single-digit millions to the Company. The Company is also eligible to receive potential
development and regulatory milestone payments, which vary based on the number of indications developed, and potential commercial milestone payments
based on annual net sales of mavorixafor-based licensed products. Assuming mavorixafor is developed by Abbisko in six indications, the Company would
be entitled to milestone payments of up to $208.0 million, which will vary based on the ultimate sales, if any, of the approved licensed products. In
addition, upon commercialization of mavorixafor in the Abbisko Territory, the Company is eligible to receive a tiered royalty, with a percentage range in
the low double-digits, on net sales of approved licensed products. Abbisko is obligated to use commercially reasonable efforts to develop and
commercialize mavorixafor in the Abbisko Territory. Abbisko has responsibility for all activities and costs associated with the further development,
manufacture and commercialization of mavorixafor in the Abbisko Licensed Territory.

The Company evaluated the Abbisko Agreement under ASC 606 and determined the Abbisko Agreement contained a single performance obligation related
to the exclusive license to develop and commercialize mavorixafor and the transfer of know-how that was satisfied at the inception of the arrangement. The
transaction price related to the transfer of the license and know-how was fully constrained and the Company ascribed no transaction price to the
development, regulatory and commercial milestones under the "most-likely amount" method. As part of its evaluation, the Company considered multiple
factors: (i) the ability of Abbisko to achieve a qualified financing (as defined in the Abbisko Agreement) is dependent on many factors outside of its control
(ii) regulatory approvals are outside of the control of Abbisko, and (iii) certain development and regulatory milestones are contingent upon the success of
future clinical trials, if any, which is out of the control of Abbisko. Any consideration related to the

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

initial transfer of the license and know-how will be recognized when it is probable that Abbisko will achieve the related financial milestone. Any
consideration related to development and regulatory milestones will be recognized when the corresponding milestones are achieved. Any consideration
related to sales-based milestones (including royalties) will be recognized when the related sales occur as these amounts have been determined to relate
predominantly to the license granted to Abbisko and therefore are recognized at the later of when the performance obligation is satisfied or the related sales
occur.

The Company determined that the future sale of clinical and commercial supply are optional goods that will be subject to the customer's future purchasing
decisions and do not represent performance obligations in the Abbisko Agreement. The Company concluded that the amount to be charged for the clinical
supply will be reflective of market value and, therefore, the Abbisko Agreement does not provide a discount on such supply that would be accounted for as
material right at the outset of the contract. In arriving at these conclusions, the Company considered the complexity of the manufacturing process for the
licensed compound and the potential ability for Abbisko to obtain the compound directly from other manufactures in the future. The Company expects that
it will recognize revenue at a point in time when such clinical supply (and commercial supply, if applicable) is delivered to Abbisko in the future.

The Company will re-evaluate the transaction price, including its estimated variable consideration for milestones included in the transaction price and all
constrained amounts, in each reporting period and as uncertain events are resolved or other changes in circumstances occur.

5. Fair Value of Financial Assets and Liabilities

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the
level of the fair value hierarchy used to determine such fair values:

(in thousands)
Assets:

Cash equivalents—money market funds

Liabilities: none

(in thousands)
Assets:

Cash equivalents—money market fund

Liabilities:

Preferred stock warrant liability

Derivative liability

Fair Value Measurements as of December 31, 2019 Using:

Level 1

Level 2

Level 3

Total

23,638    $

23,638    $

39,999    $

39,999    $

—    $

—    $

63,637   

63,637   

Fair Value Measurements as of December 31, 2018 Using:

Level 1

Level 2

Level 3

Total

—    $

—    $

—    $

—   

—    $

8,134    $

8,134    $

—    $

—   

—    $

—    $

—    $

4,947    $

201   

5,148    $

8,134   

8,134   

4,947   

201   

5,148   

$

$

$

$

$

$

As of December 31, 2019 and December 31, 2018, there were no transfers between Level 1, Level 2 and Level 3.

The Company’s cash equivalents consisted of money market funds invested in U.S. Treasury securities. The money market funds were valued based on
reported market pricing for the identical asset or by using inputs observable in active markets for similar securities, which represents a Level 2
measurement in the fair value hierarchy.

Valuation of Preferred Stock Warrant Liabilities— The preferred stock warrant liability in the table above consists of the fair values of (i) warrants to
purchase shares of Series A convertible preferred stock that were issued in 2015 and shares of Series B convertible preferred stock that were issued in 2017
and 2018 in connection with the Company’s Series A and Series B convertible preferred stock financings, respectively (see Note 11), (ii) warrants to
purchase shares of Series A convertible

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

preferred stock that were issued in 2016 in connection with the Company’s entering into a loan and security agreement with Silicon Valley Bank (see
Note 8) and (iii) warrants to purchase shares of Series B convertible preferred stock that were issued or were issuable in 2018 in connection with the
Company’s entering into the Hercules Loan Agreement (see Note 8). The liability associated with the warrants was recorded at fair value on the dates the
warrants were issued and exercisable and was subsequently remeasured to fair value at each reporting date through December 31, 2018. Upon the closing
of the Merger on March 13, 2019, all X4 preferred stock warrants were converted to warrants for Company’s common stock and, as a result, the warrants
were adjusted to fair value and reclassified to permanent equity. The aggregate fair value of the warrant liability was determined based on significant inputs
not observable in the market, which represents a Level 3 measurement within the fair value hierarchy.

The Company used various valuation methods, including the Monte Carlo method, the option-pricing method and the hybrid method (which is a
combination of an option-pricing method and a probability-weighted expected return method), all of which incorporate assumptions and estimates, to value
the preferred stock warrants. Estimates and assumptions impacting the fair value measurement include the fair value per share of the underlying shares of
the Company’s Series A and Series B convertible preferred stock, risk free interest rate, expected dividend yield, expected volatility of the price of the
underlying preferred stock, and either the remaining contractual term of the warrants (except for warrants that would be automatically exercised upon an
initial public offering, in which case the remaining estimated term to automatic exercise was used). The most significant assumption in the Monte Carlo
method, the option-pricing method and the hybrid method impacting the fair value of the preferred stock warrants is the fair value of the Company’s
convertible preferred stock as of each remeasurement date. The Company determines the fair value per share of the underlying preferred stock by taking
into consideration the most recent sales of its convertible preferred stock, results obtained from third-party valuations and additional factors that are deemed
relevant. As of December 31, 2018, the fair value of the Series A convertible preferred stock was $1.70 per share and the fair value of the Series B
convertible preferred stock was $1.86 per share. There were no warrants for the purchase of convertible preferred shares as of December 31, 2019 as all
such warrants were converted to warrants for the purchase of common stock upon the Merger. The Company was a private company prior to the Merger
and lacked company-specific historical and implied volatility information of its stock. Therefore, the Company had estimated its expected stock volatility
based on the historical volatility of publicly traded peer companies for a term equal to the estimated remaining term of the warrants. The risk-free interest
rate is determined by reference to the U.S. Treasury yield curve for time periods approximately equal to the estimated remaining term of the warrants. The
Company estimated a 0% expected dividend yield as the Company has never paid or declared dividends and does not intend to do so in the foreseeable
future.

Valuation of Derivative Liability— The fair value of the derivative liability recognized in connection with the Genzyme Agreement (see Note 4) was
determined based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The fair value
of this derivative liability is reported within other liabilities on the consolidated balance sheets. The fair value of this derivative liability was estimated by
the Company at each reporting date based, in part, on the results of third-party valuations, which were prepared using the option-pricing method or the
hybrid method, each of which considered as inputs the type, timing and probability of occurrence of a change of control event, the potential amount of the
payment under potential exit scenarios, the fair value per share of the underlying common stock and the risk-adjusted discount rate. As of December 31,
2018, the fair value of this derivative liability was $183 thousand. The Merger (see Note 1) qualified as a change of control event, as defined in the
Genzyme Agreement, but results in no payment being due to Genzyme under the Genzyme Agreement. As a result, on March 13, 2019, the closing date of
the Merger with Arsanis, this derivative liability was remeasured to fair value, which was zero, and subsequent changes in fair value will no longer be
recognized in the consolidated statements of operations because the contingent payment obligation to Genzyme expired at that time.

The fair value of the derivative liability recognized in connection with the Hercules Loan Agreement (see Note 8) was determined based on significant
inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The fair value of this derivative liability is
reported within other liabilities on the consolidated balance sheets. The fair value of this derivative liability was estimated by the Company at each
reporting date based, in part, on the results of third-party valuations, which were prepared based on a discounted cash flow model that considered the
timing and probability of occurrence of a redemption upon an event of default, the potential amount of prepayment upon an event of default and the risk-
adjusted discount rate. As of December 31, 2019 and December 31, 2018, the fair value of this derivative liability was immaterial.

The following table provides a roll-forward of the aggregate fair values of the Company’s warrant liability and derivative liability, for which fair values are
determined using Level 3 inputs:

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(in thousands)
Balance as of December 31, 2017

Issuance of warrants to purchase shares of Series B convertible preferred stock

Initial fair value of derivative liability in connection with the Hercules Loan Agreement

Change in fair value

Balance as of December 31, 2018

Change in fair value

Conversion of convertible preferred stock warrant into common stock warrant in connection with Merger

Balance at December 31, 2019

Preferred Stock
Warrant Liability

Derivative
Liability

$

1,245    $

304   

—   

3,398   

4,947   

288   

(5,235)  

$

—    $

94   

—   

18   

89   

201   

(183)  

—   

18   

6. Property and Equipment, Net

Property and equipment, net consisted of the following:

(in thousands)
Leasehold improvements

Furniture and fixtures

Computer equipment

Software

Lab equipment

Less: Accumulated depreciation and amortization

December 31,
2019

December 31,
2018

$

299    $

139   

37   

33   

159   

667   

(264)  

403    $

$

299   

53   

56   

9   

—   

417   

(176)  

241   

Depreciation and amortization expense related to property and equipment was approximately $103 thousand for each of the twelve months ended
December 31, 2019 and 2018 and $71 thousand for the year ended December 31, 2017.

7. Accrued Expenses

Accrued expenses consisted of the following

(in thousands)
Accrued employee compensation and benefits

Accrued external research and development expenses

Accrued professional fees

Other

8. Long-Term Debt

Long-term debt consisted of the following:

F-25

December 31,
2019

December 31,
2018

$

$

2,916    $

1,977   

1,347   

221   

6,461    $

924   

754   

1,324   

249   

3,251   

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(in thousands)
Principal amount of long-term debt

Less: Current portion of long-term debt

Long-term debt, net of current portion

Debt discount, net of accretion

Cumulative accretion of final payment due at maturity

Long-term debt, including accretion, net of discount and current portion

December 31,
2019
20,000    $

December 31,
2018
10,000   

$

—   

(1,687)  

20,000   

(317)  

414   

$

20,097    $

8,313   

(226)  

58   

8,145   

SVB Loan Agreement
In October 2016, the Company entered into a loan and security agreement with Silicon Valley Bank (“SVB”), which the Company refers to as the SVB
Loan Agreement, pursuant to which SVB made certain term loans available to the Company. The SVB Loan Agreement provided for a term loan of up to
$6.0 million, which was borrowed by the Company in September 2017. Borrowings under the SVB Loan Agreement bore interest at a variable rate equal to
5.5% plus the greater of (i) 3.5% or (ii) The Wall Street Journal prime rate. In October 2018, in connection with entering into the Hercules Loan
Agreement, the Company terminated the SVB Loan Agreement and repaid all amounts due under the SVB Loan Agreement of $4.7 million, including
outstanding principal, prepayment premiums and accrued interest. The Company accounted for the termination of the SVB Loan Agreement as an
extinguishment and recognized a loss of $229 thousand, which was calculated as the difference between the reacquisition price of the borrowings under the
SVB Loan Agreement and the carrying value of the debt at the time of the extinguishment.

The Company recognized aggregate interest expense under the SVB Loan Agreement of $484 thousand and $490 thousand for the years ended December
31, 2018 and 2017, respectively, reflecting an effective interest rate of approximately 11.8% and 12.0%, respectively. As of October 19, 2018, the date of
repayment of all borrowings under the SVB Loan Agreement, the contractual interest rate applicable to borrowings under the SVB Loan Agreement was
10.75%.

Hercules Loan Agreements

Hercules Loan Agreement and First Amendment
In October 2018, the Company entered into the Hercules Loan Agreement. The Hercules Loan Agreement provided for aggregate borrowings of up to
$13.0 million, consisting of (i) a term loan of up to $8.0 million, which was available upon entering into the agreement, (ii) subject to specified financing
conditions, an additional term loan of up to $2.0 million, available for borrowing from January 1, 2019 to March 31, 2019, and (iii) subject to specified
financing conditions and the receipt of the second tranche term loan in the amount of $2.0 million described above, an additional term loan of up to
$3.0 million, available for borrowing until March 31, 2019. In October 2018, the Company borrowed $8.0 million under the Hercules Loan Agreement. In
December 2018, the Company entered into the First Amendment to the Hercules Loan Agreement (the “First Amendment”), which amended the available
borrowing dates of the second tranche from between January 1, 2019 and March 31, 2019 to between December 11, 2018 and December 14, 2018 and
amended the term loan maturity date to November 1, 2021. In December 2018, the Company borrowed the additional $2.0 million provided under the
Hercules Loan Agreement, as amended by the First Amendment. In March 2019, the conditions necessary for borrowing the remaining $3.0 million under
the Hercules Loan Agreement, as amended by the First Amendment, were not met and the borrowing capacity expired at that time.

In connection with entering into the Hercules Loan Agreement in October 2018, the Company issued to Hercules warrants for the purchase of
210,638 shares of Series B convertible preferred stock at an exercise price of $1.88 per share (which were subsequently converted to warrants for the
purchase of 20,016 shares of common stock at an exercise price of $19.78 per share following the Merger). These warrants were immediately exercisable
and expire in October 2028. In addition, in connection with entering into the First Amendment in December 2018, the Company agreed to issue to Hercules
warrants for the purchase of a specified number of shares of convertible preferred stock at an aggregate exercise price of $99. On March 18, 2019, as a
result of the closing of the Merger with Arsanis on March 13, 2019, the Company issued to Hercules warrants for the purchase of 5,000 shares of common
stock of the combined organization at an exercise price of $19.80 per share, each of which reflected the share Exchange Ratio of 1-for-0.5702 applied in the
Merger as well as the Reverse Stock Split effected by the combined organization on March 13, 2019. On October 19, 2018 and December 11, 2018, the
dates the Company entered into the Hercules Loan Agreement and the First Amendment, respectively, the Company recorded the aggregate initial fair
value of the warrants of $132 thousand as a preferred stock warrant liability, with a corresponding amount recorded as a debt discount on the Company’s

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

consolidated balance sheet. As of March 13, 2019, and December 31, 2018, the fair value of the warrants were $326 thousand and $282 thousand,
respectively. Upon the closing of the Merger, the warrants were converted to warrants for common stock and are no longer adjusted to fair value.

2019 Amended and Restated Loan Agreement
In June 2019, the Company refinanced the Hercules Loan Agreement, as amended, and entered into an Amended and Restated Loan and Security
Agreement (the “2019 Loan Agreement”) with Hercules. The 2019 Loan Agreement provides for aggregate maximum borrowings of $35.0 million, of
which $10.0 million was previously outstanding. The Company agreed to borrow $20.0 million as of the closing date on June 27, 2019, including
$10.0 million in new borrowings and $10.0 million rolled over from the previous agreement. An additional $5.0 million is available for borrowing through
December 15, 2020 and, subject to approval by Hercules, and an additional term loan of $10.0 million is available through June 15, 2022. Borrowings
under the 2019 Loan Agreement bear interest at a variable rate equal to the greater of (i) 8.75% or (ii) 8.75% plus The Wall Street Journal prime rate minus
6.0%.  In an event of default, as defined in the 2019 Loan Agreement, and until such event is no longer continuing, the interest rate applicable to
borrowings under the 2019 Loan Agreement would be increased by 4.0%.

Borrowings under the 2019 Loan Agreement are repayable in monthly interest-only payments through January 1, 2022, and in equal monthly payments of
principal and accrued interest from February 1, 2022 until the maturity date of the loan, which is July 1, 2023. At the Company’s option, the Company may
prepay all, but not less than all, of the outstanding borrowings, subject to a prepayment premium of up to 2.0% of the principal amount outstanding as of
the date of repayment. In addition, the 2019 Loan Agreement provides for payments by the Company to Hercules of (i) $0.8 million payable upon the
earlier of November 1, 2021 or the repayment in full of all obligations under the 2019 Loan Agreement, and (ii) 4.0% of the aggregate principal drawn
under the 2019 Loan Agreement payable upon the earlier of maturity or the repayment in full of all obligations under such agreement.

Borrowings under the 2019 Loan Agreement are collateralized by substantially all of the Company’s personal property and other assets except for the
Company’s intellectual property (but including rights to payment and proceeds from the sale, licensing or disposition of the intellectual property). Under
the 2019 Loan Agreement, the Company has agreed to affirmative and negative covenants to which it will remain subject until maturity or repayment of the
loan in full. The covenants include (a) maintaining a minimum liquidity amount of the lesser of (i) 125% of the aggregate principal amount of outstanding
borrowings under the June 2019 Loan Agreement and (ii) 100% of the Company and its consolidated subsidiaries’ cash and cash equivalents (other than up
to $2.5 million which may be held by an excluded subsidiary, as defined) in an account in which Hercules has a first priority security interest, as well as
(b) restrictions on the Company’s ability to incur additional indebtedness, pay dividends, encumber its intellectual property, or engage in certain
fundamental business transactions, such as mergers or acquisitions of other businesses. The 2019 Loan Agreement also contains a covenant that requires
the Company to repay its loan with Österreichische Forschungsförderungsgesellschaft mbH ("FFG") on or prior to December 31, 2019. The FFG Loan
Agreement was settled during the three months ended September 30, 2019 as discussed further below.

In connection with entering into the Hercules Loan Agreement and the First Amendment, the Company had deferred $180 thousand associated with upfront
(1) fees associated with entering into the agreement, (2) the fair value of the warrants issued and (3) the fair value of an embedded derivative associated
with the accelerated redemption feature. The $180 thousand is classified as a debt discount, which is reflected as a reduction of the carrying value of long-
term debt on the Company’s consolidated balance sheet and is being amortized to interest expense over the term of the loan using the effective interest
method. As a result of the June 2019 refinancing and entering into the 2019 Loan Agreement, the Company considered whether the previous debt was
either extinguished or modified based on the difference in the cash flows of the previous and new debt. The Company determined that Hercules Loan
Agreement, as amended by the First Amendment, was modified. Accordingly, the unamortized debt discount of the previous debt and newly incurred fees
paid to the lender related to the 2019 Loan Agreement will be amortized to interest expense over the life of the new debt arrangement using the effective
interest method.

The Company recognized aggregate interest expense under the Hercules Loan Agreement, as amended by the First Amendment, and the 2019 Loan
Agreement of $1.8 million and $236 thousand during the twelve months ended December 31, 2019 and 2018, respectively. Interest expense includes $61
thousand and $355 thousand related to the accretion of the debt discount and the final payment for the year ended December 31, 2019, respectively. As of
December 31, 2019, the unamortized debt discount was $317 thousand. The annual effective interest rate on the 2019 Loan Agreement is 10.9%. There
were no principal payments due or paid under the Hercules Loan Agreement, as amended by the First Amendment, during the twelve months ended
December 31, 2019. Principal payments begin in January 2022.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

FFG Loan Agreements
Between September 2011 and March 2017, Arsanis GmbH entered into a series of funding agreements with FFG that provided for loans and grants to fund
qualifying research and development expenditures of X4 GmbH on a project-by-project basis, as approved by FFG. Amounts due under the FFG loans bear
interest at rates ranging from 0.75% to 2.00% per annum. Giving effect to the Settlement Agreement (as defined below), the loans matured at various dates
between March 31, 2019 and March 31, 2021. Interest on amounts due under the loans is payable semi-annually in arrears, with all principal and remaining
accrued interest due upon maturity.

On March 8, 2019, Arsanis, Merger Sub, X4 and Arsanis GmbH entered into a Settlement Agreement with FFG (the “Settlement Agreement”) in respect to
allegations by FFG in February 2019 that Arsanis and Arsanis GmbH breached certain reporting, performance and other obligations in connection with
grants and loans made by FFG to Arsanis GmbH between September 2011 and March 2017 to fund qualifying research and development expenditures.
Pursuant to the terms of the Settlement Agreement, in exchange for FFG’s waiver of all claims against Arsanis and Arsanis GmbH (except for its claims for
repayment of the loans and regular interest but including its waiver of claims for repayment of grants and interest exceeding regular interest), subject to
compliance by Arsanis and Arsanis GmbH with the terms of the Settlement Agreement, Arsanis GmbH agreed to repay the outstanding loan principal (plus
regular interest accrued thereon) on an accelerated payment schedule of three years instead of five years, with the final accelerated installment due and
payable on June 30, 2021. The parties also agreed, among other things, that (i) the portion of such loans to be repaid in 2019 will be $2.9 million on the
first business day following March 31, 2019, and such amount was paid on April 1, 2019, and (ii) until all of the loans have been repaid and subject to other
terms specified in the Settlement Agreement, commencing April 30, 2019, a minimum cash balance equal to 70% of the then-outstanding principal amount
of the loans will be maintained at X4 Pharmaceuticals (Austria) GmbH in an account held with an Austrian bank.

The Company recognized interest expense under the FFG agreement of $316 thousand for the year ended December 31, 2019. In September 2019, the
Company repaid all amounts due under the FFG loans and recognized a loss on extinguishment of debt of $566 thousand, which was calculated as the
difference between the reacquisition price of the borrowings under the FFG Loan Agreement and the carrying value of the debt at the time of the
extinguishment.

As of December 31, 2019, future principal payments and the final payment due under the Company’s loan agreements were as follows (in thousands):
Year Ending December 31
2020

Total 

$

—   

2021

2022

2023

Long-term debt

9. Leases

—   

11,897   

8,103   

20,000   

$

Effective January 1, 2019, the Company adopted ASC 842 using the modified retrospective approach through a cumulative-effect adjustment and utilizing
the effective date as its date of initial application, with prior periods unchanged and presented in accordance with the previous lease accounting guidance.
Upon adoption, the Company recorded right-of-use assets of $2.0 million and lease liabilities of $2.5 million, of which $1.9 million was classified as non-
current and $613 thousand as current. The difference between the value of the right-of-use assets and the lease liabilities related to $512 thousand of net
deferred, accrued and prepaid rent that was reclassified against the right-of-use asset upon adoption of ASC 842 on January 1, 2019. The Company has
lease agreements for its facilities in Cambridge, Massachusetts, which is the Company’s global headquarters; Vienna, Austria, which is the Company’s
research and development center; Waltham, Massachusetts, which is the former headquarters of Arsanis that the Company has sublet to a third party; and
Allston, Massachusetts, as further discussed below. There are no restrictions or financial covenants associated with any of the lease agreements.

Cambridge Lease— In August 2017, the Company entered into a non-cancellable operating lease agreement for office space of approximately 13,000
square feet in Cambridge, Massachusetts (“Cambridge Lease”) which expires on July 31, 2022. The Cambridge Lease includes an annual fixed rent
escalation clause and such rent escalations were included in the calculation of the right-of-use asset. The Company has the option to extend the lease for
one period of 5 additional years. Base rent is approximately $832 thousand annually and the monthly rent expense is being recognized on a straight-line
basis over the term of the lease as the Company amortizes the associated operating lease right-of-use asset. In addition to the base rent, the Company is also
responsible

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

for its share of operating expenses, electricity and real estate taxes, in accordance with the terms of lease. These costs are not included in the determination
of the leases’ right-of-use operating assets or lease operating liabilities.

Waltham Lease— On March 13, 2019, as part of its Merger with Arsanis, the Company acquired a non-cancellable operating lease for approximately 6,000
square feet of office space in Waltham, Massachusetts (“Waltham Lease”). The Waltham Lease, as amended, commenced on January 1, 2019, and expires
approximately 5 years from the commencement date. The base rent is approximately $263 thousand annually. In addition to the base rent, the Company is
also responsible for its share of operating expenses, electricity and real estate taxes, which costs are not included in the determination of the leases’ right-
of-use assets or lease liabilities. The Company is subleasing the space to a third party for the duration of the lease. As a result, the Company has adjusted
the value of the right-of-use asset to its estimated fair value, which represents future sublease income less costs to obtain sublease. The right-of-use asset is
being amortized to rent expense over the 5 year term of the lease.

Vienna Austria Lease— On March 13, 2019, as part of its Merger with Arsanis, the Company acquired an operating lease for approximately 400 square
meters of laboratory and office space in Vienna, Austria, (the “Vienna Austria Lease”) which commenced on March 1, 2019, as amended, for a term of 2
years. The lease is cancellable by the Company upon three months’ notice with no penalty. The annual base rent is approximately $154 thousand. The
Company has classified this lease as a short-term lease as it is not reasonably certain that the Company with not terminate the lease within one year and,
accordingly, has not recorded a right-of-use asset. Accordingly, rent expense is recorded on a straight-line basis as incurred over the term of the lease.

Allston Lease— On November 11, 2019, the Company entered into a lease agreement for approximately 28,000 square feet of office space currently under
construction in a building located in Allston, Massachusetts. The office space is expected to replace the Company’s current headquarters located in
Cambridge, Massachusetts. The Company intends to move into the premises in mid-2020 upon the completion of construction. Monthly rent payments
under the lease are expected to commence in May, 2020, reflecting a 180-day rent-free period following the execution of the Lease, subject to the timely
completion of construction of the premises. Base rental payments will be approximately $1.0 million annually, plus certain operating expenses. The term of
the lease will continue until November 2026, unless earlier terminated in accordance with the terms of the lease. The Company has the right to sublease the
premises, subject to landlord consent. The Company also has the right to renew the lease for an additional five years at the then prevailing effective market
rental rate. The Company is required to provide the landlord with a $1.1 million security deposit in the form of a letter of credit, which is classified as
restricted cash.

For the Allston lease, the Company will participate in the construction of the office space and will incur construction costs to prepare the office space for its
use, which will be partially reimbursed by the landlord. The Company has concluded that these construction costs generate and enhance the landlord's
assets and, as such, costs that are not reimbursed will be classified as prepaid rent and then reclassified to the right-of-use asset on the lease commencement
date, which is expected to occur once the landlord's asset is completed and available for additional leasehold improvements funded by the Company. Upon
the lease commencement date, which had not yet occurred as of December 31, 2019, the Company will recognize the lease liability, which will reflect the
future rent payments for the term of the lease discounted at the Company's collateralized borrowing rate, and the right-of-use asset, which will be measured
as the lease liability plus the prepaid rent incurred to date.

As the Company’s leases do not provide an implicit rate, the Company estimated the incremental borrowing rate in calculating the present value of the
lease payments. The Company utilizes its incremental borrowing rates, which are the rates incurred to borrow on a collateralized basis over a similar term
an amount equal to the lease payments in a similar economic environment.

The components of lease expense for the year ended December 31, 2019 were as follows (dollars in thousands):

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Table of Contents

Lease Cost

Fixed operating lease cost

Short-term lease costs

Total lease expense

Other information

Cash paid for amounts included in the measurement of lease liabilities:

Operating cash flows from operating leases

Leased assets obtained in exchange for new operating lease liabilities (1)

Weighted-average remaining lease term—operating leases

Weighted-average discount rate—operating leases

Sublease income

___________________________________________
(1)

Acquired in the Merger

For the Year Ended December 31,
2019

$

$

$

$

$

827 

122 

949 

1,007 

484 

3.0 years

9.0  %

14 

Maturities of lease liabilities due under these lease agreements as of December 31, 2019 are as follows (in thousands):

Maturity of lease liabilities

2020

2021

2022

2023

Total lease payments

Less: interest

Total operating lease liabilities as of December 31, 2019

Operating
Leases

1,124   

1,098   

754   

263   

3,239   

(423)  

2,816   

$

$

The above table does not include future lease payments related to the Company's Allston lease for which a lease liability has not yet been recorded. The
lease liability will be recorded upon the commencement date of the lease. Future lease payments upon the commencement date of the lease are expected to
be approximately $0.6 million in 2020, $1.0 million in 2021, $1.0 million in 2022, $1.1 million in 2023, $1.1 million in 2024, $1.1 million in 2025 and $1.1
million in 2026. In addition, the Company expects to incur unreimbursed expenditures of $3.1 million related to the construction of the office space.

As of December 31, 2018, minimum future lease payments under non-cancellable operating leases for each of the following five years and a total thereafter
were as follows (in thousands):

Year Ending December 31,

Operating Leases

2019

2020

2021

2022

Total

$

$

810   

823   

835   

492   

2,960   

10. Commitment and Contingencies

Sponsored Research Agreement Commitments— In April 2017, the Company entered into a sponsored research agreement with a university pursuant to
which the Company and the university are conducting a research program related to understanding

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

the mechanisms of failed long-term adaptive immunity in WHIM patients. Under the terms of the agreement, the Company agreed to provide funding for
the research program of up to $499 thousand over a three years period. The agreement will remain in effect for three years, unless earlier terminated. The
Company may terminate the agreement at any time upon at least 60 days’ prior written notice. For the years ended December 31, 2019, 2018, and 2017, the
Company incurred $166 thousand, $166 thousand and $111 thousand, respectively, of research and development expenses related to its payment obligations
to the university under the agreement. As of December 31, 2019, the Company had non-cancelable purchase commitments under this agreement totaling
$55 thousand committed in 2020.

In May 2019, the Company amended its agreement with a clinical research organization (“CRO”) pursuant to which the Company and the CRO are
conducting a global Phase 3 clinical trial of mavorixafor for the treatment of WHIM syndrome. The Company may terminate the agreement by providing
30 days’ notice and if such termination occurred, the Company would incur early termination fees of up to $0.6 million based on a percentage of committed
resources of the CRO as of the termination.   

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 and its executive officers that will require the Company to, among other things, 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
indemnification obligations. The Company is not currently aware of any indemnification claims and has not accrued any liabilities related to such
obligations in its consolidated financial statements as of December 31, 2019 or December 31, 2018.

License Agreements— In February 2017, Arsanis entered into an option and license agreement with Adimab to obtain rights to certain RSV antibodies,
which are being used in the “ASN500” program. The Company exercised this option for an up-front payment of $250 thousand. In July 2019, as further
described in Note 16, the Company transferred the intellectual property related to the ASN500 program through an exclusive, worldwide license with a
third party. The Company remains obligated to make payments to Adimab based on future clinical and regulatory milestones of up to approximately
$25.0 million, as well as royalty payments on a product-by-product and country-by-country basis of a mid-single-digit percentage based on net sales of
products based on certain RSV antibodies during the applicable term for such product in that country. The third party is required to fund any future
payments that may become due to Adimab.

Legal Proceedings— The Company is not a party to any litigation and does not have contingency reserves established for any litigation liabilities. 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.

11. Preferred and Common Stock Warrants

Prior to the Merger (see Note 1), the Company issued warrants for the purchase of its preferred stock and had classified these preferred stock warrants as a
liability on its consolidated balance sheet as the warrants were deemed to be freestanding financial instruments that may have required the Company to
transfer assets upon exercise. The liability associated with each of these warrants was initially recorded at fair value upon the issuance date of each warrant
and was subsequently remeasured to fair value as a component of other income (expense), net in the consolidated statement of operations and
comprehensive loss. Upon the closing of the Merger, pursuant to the Merger Agreement, all of the outstanding X4 preferred stock was converted to Arsanis
common stock and the X4 preferred stock warrants converted to warrants for the purchase of Arsanis common stock. The Company assessed the features of
the warrants and determined that they qualify for classification as permanent equity upon the closing of the Merger. Accordingly, the Company remeasured
the warrants to fair value upon the closing of the Merger, which was $5.2 million at March 13, 2019, with $288 thousand of expense recorded during the
three months ended March 31, 2019. Upon the closing of the Merger, the warrant liability was reclassified to additional paid-in capital.

In connection with its issuance of common stock in public offerings that closed on April 16, 2019 and November 29, 2019, the Company issued 3,900,000
Class A warrants, which are exercisable for shares of the Company's common stock, and 5,416,667

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Class B warrants, which are exercisable for shares of the Company's common stock or prefunded warrants to purchase shares of the Company's common.
The Class A warrants have an exercise price of $13.20 per warrant, expire on April 15, 2024 and were immediately exercisable upon issuance. The Class B
warrants were immediately exercisable upon issuance, have an exercise price of $15.00 per warrant and expire on a date that is the earlier of (a) the date
that is 30 calendar days from the date on which the Company issues a press release announcing top-line data from its Phase 3 clinical trial of mavorixafor
for the treatment of patients with WHIM syndrome (or, if such date is not a business day, the next business day) and (b) November 28, 2024. In addition, in
connection with the April 16, 2019 and November 29, 2019 offerings, the Company issued 2,130,000 and 1,750,000 prefunded warrants, respectively, for
proceeds of $10.999 and $11.999 per share, respectively. Each of the prefunded warrants is exercisable into one share of the Company's common stock, has
a remaining exercise price of $0.001 per share and was immediately exercisable upon issuance.

The following table provides a roll forward of outstanding warrants for the twelve month period ended December 31, 2019:

Outstanding and exercisable warrants to purchase preferred shares as of December 31,
2018

Conversion of warrants to purchase preferred shares to warrants for the

purchase of common stock and adjusted for the Exchange Ratio and Reverse Stock
Split

Issuance of warrants for the purchase of common stock or prefunded warrants to
purchase common stock

Exercised

Outstanding and exercisable as of December 31, 2019

Number of warrants

Weighted
Average
Exercise
Price

Weighted
Average
Contractual
Term (Years)

5,146,400    $

—   

4.23

(4,657,350)  

13,201,667   

(33,846)  

13,656,871    $

13.43   

13.20   

13.68   

4.59

As of December 31, 2019, the Company’s outstanding warrants to purchase shares of common stock consisted of the following:

Issuance Date

August 14, 2015

August 21, 2015

October 25, 2016

November 1, 2017

November 17, 2017

December 4, 2017

December 28, 2017

December 28, 2017

September 12, 2018

September 12, 2018

October 19, 2018

March 13, 2019

April 16, 2019

April 16, 2019

November 29, 2019

November 29, 2019

Number of
Shares of
Common
Stock Issuable

Exercise
Price

Classification

Expiration Date

21.78   

21.78   

19.78   

19.78   

19.78   

19.78   

19.78   

19.78   

19.78   

19.78   

19.78   

19.80   

13.20   

11.00   

15.00   

12.00   

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

Equity

August 14, 2020

August 21, 2020

October 24, 2026

October 31, 2020

November 16, 2020

December 3, 2020

December 27, 2020

December 28, 2027

September 12, 2021

September 12, 2028

October 19, 2028

March 12, 2029

April 15, 2024

n/a

November 28, 2024

n/a

81,228    $

69,603    $

5,155    $

130,609    $

8,442    $

5,661    $

6,925    $

115,916    $

25,275    $

20,220    $

20,016    $

5,000    $

3,866,154    $

2,130,000    $

5,416,667    $

1,750,000    $

13,656,871   

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As of December 31, 2018, the Company’s outstanding warrants to purchase shares of preferred stock (which converted into warrants to purchase common
stock upon close of the Merger) consisted of the following (not adjusted for the Reverse Stock Split or Exchange Ratio):

December 31, 2018

Issuance Date

August 14, 2015

August 21, 2015

October 25, 2016

November 1, 2017

November 17, 2017

December 4, 2017

December 28, 2017

December 28, 2017

September 12, 2018

September 12, 2018

October 19, 2018

Number of
Shares of
Preferred
Stock Issuable

Exercise
Price

Exercisable for

Classification

Expiration Date

854,785    $

732,453    $

54,256    $

1,374,435    $

88,845    $

59,576    $

72,875    $

1,219,815    $

265,957    $

212,765    $

210,638    $

5,146,400   

2.07   

2.07   

1.88   

1.88   

1.88   

1.88   

1.88   

1.88   

1.88   

1.88   

1.88   

Series A

Series A

Series A

Series B

Series B

Series B

Series B

Series B

Series B

Series B

Series B

Liability

Liability

Liability

Liability

Liability

Liability

Liability

Liability

Liability

Liability

Liability

August 14, 2020

August 21, 2020

October 24, 2026

October 31, 2020

November 16, 2020

December 3, 2020

December 27, 2020

December 28, 2027

September 12, 2021

September 12, 2028

October 19, 2028

12. Common Stock, Redeemable Common Stock, and Convertible Preferred Stock (converted to Common Stock)

Common Stock— As of December 31, 2019 and December 31, 2018, the Company’s Certificate of Incorporation, as amended and restated, authorized the
Company to issue 33,333,333 shares and 11,070,776, shares, respectively, of $0.001 par value common stock. The voting, dividend and liquidation rights
of the holders of the Company’s common stock are subject to and qualified by the rights, powers and preferences of the holders of the preferred stock. Each
share of common stock entitles the holder to one vote on all matters submitted to a vote of the Company’s stockholders. Common stockholders are entitled
to receive dividends, as may be declared by the board of directors, if any. No cash dividends have been declared or paid to date.

On April 12, 2019, the Company entered into an underwriting agreement with Cowen and Company, LLC and Stifel, Nicolaus & Company, Incorporated,
as representatives of the several underwriters named therein pursuant to which it sold 5,670,000 shares of common stock and, in lieu of common stock,
prefunded warrants to purchase 2,130,000 shares of common stock, and accompanying Class A warrants to purchase 3,900,000 shares of its common stock.
The common stock was issued at a price to the public of $11.00 per share and accompanying Class A warrant and the prefunded warrants were issued at a
price of $10.999 per prefunded warrant and accompanying Class A warrant. The Class A warrants have an exercise price of $13.20, will expire 5 years
from the date of issuance, and are immediately exercisable with certain restrictions. The gross proceeds from the offering, which closed on April 16, 2019,
were $85.8 million before deducting underwriting discounts and offering expenses.

On November 26, 2019, the Company entered into an underwriting agreement with Cowen and Company, LLC and Stifel, Nicolaus & Company,
Incorporated, as representatives of the several underwriters named therein pursuant to which it sold 3,666,667 shares of common stock and, in lieu of
common stock, prefunded warrants to purchase 1,750,000 shares of common stock, and accompanying Class B warrants to purchase 5,416,667 shares of its
common stock or prefunded warrants to purchase shares of common stock. The common stock was issued at a price to the public of $12.00 per share and
accompanying Class B warrant and the prefunded warrants were issued at a price of $11.999 per prefunded warrant and accompanying Class B warrant.
The Class B warrants have an exercise price of $15.00 per warrant, which includes a down-round contingent price adjustment feature; expire on a date that
is the earlier of (a) the date that is 30 calendar days from the date on which the Company issues a press release announcing top-line data from its Phase 3
clinical trial of mavorixafor for the treatment of patients with WHIM syndrome (or, if such date is not a business day, the next business day) and (b)
November 28, 2024; and were immediately exercisable upon issuance. The gross proceeds from the offering, which closed on November 29, 2019, were
$65.0 million before deducting underwriting discounts and offering expenses.

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

For each of the common stock offerings, the Company evaluated the Class A, Class B and prefunded warrants for liability or equity classification in
accordance with the provisions of ASC 480, Distinguishing Liabilities from Equity, and ASC 815-40, Derivatives and Hedging, and determined that equity
treatment was appropriate because neither the Class A, Class B or prefunded warrants meet the definition of a liability.

Redeemable Common Stock— Pursuant to the requirements of the July 2014 license agreement with Genzyme (see Note 4), in August 2015, the Company
issued to Genzyme for no additional consideration 107,371 shares of common stock, which had an aggregate fair value of $734 on the date of issuance.
Genzyme had the right to require the Company to repurchase all, but not less than all, of these shares of common stock at any time during the term of the
license agreement for a price of $0.001 per share. Because of this redemption feature, the shares of common stock issued to Genzyme were classified
outside of stockholders’ deficit on the consolidated balance sheets. As a result of the Merger, these shares were exchanged for common stock.

Convertible Preferred Stock (converted to Common Stock)— The Company has issued Series Seed convertible preferred stock (the “Series Seed preferred
stock”), Series A convertible preferred stock (the “Series A preferred stock”) and Series B convertible preferred stock (the “Series B preferred stock”). As
of December 31, 2019 and December 31, 2018, the Company’s Certificate of Incorporation, as amended and restated, authorized the Company to issue a
total of 10,000,000 shares and 59,413,523 shares, respectively, of preferred stock, with a par value of $0.001 per share.

The holders of Preferred Stock have liquidation rights in the event of a deemed liquidation that, in certain situations, are not solely within the control of the
Company. Therefore, the Preferred Stock is classified outside of stockholders’ deficit on the consolidated balance sheet.

As of December 31, 2019, there was no preferred stock outstanding. As of December 31, 2018, the preferred stock consisted of the following:

December 31, 2018

Preferred
Stock
Designated

Preferred
Stock
Issued and
Outstanding

Carrying
Value

Liquidation
Preference

2,313,523   

1,516,136    $

1,310,000    $

1,444,000   

22,000,000   

19,946,862   

32,480,000   

47,624,000   

25,100,000   

18,616,569   

30,885,000   

34,999,000   

49,413,523   

40,079,567    $

64,675,000    $

84,067,000   

Common Stock
Issuable Upon
Conversion
(1)

143,630   

1,895,610   

1,769,190   

3,808,430   

Series Seed preferred stock

Series A preferred stock

Series B preferred stock

___________________________________

(1) Adjusted to reflect Reverse Stock Split and Exchange Ratio.

13. Stock-Based Compensation

Summary of Plans— Upon completion of the Merger with Arsanis on March 13, 2019, X4’s 2015 Employee, Director and Consultant Equity Incentive
Plan, as amended (the “2015 Plan”), Arsanis’ 2017 Equity Incentive Plan (the “2017 Plan”) and Arsanis’ 2017 Employee Stock Purchase Plan (the
“ESPP”) were assumed by the Company. In June 2019, the Company adopted the 2019 Inducement Equity Incentive Plan (the “2019 Plan”). These plans
are administered by the Board of Directors or, at the discretion of the Board of Directors, by a committee of the Board of Directors. The exercise prices,
vesting and other restrictions are determined at the discretion of the Board of Directors, or its 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 the stock
option may not be greater than ten years. Incentive stock options granted to employees and restricted stock awards granted to employees, officers, members
of the board of directors, advisors, and consultants of the Company typically vest over four years. Non-statutory options granted to employees, officers,
members of the Board of Directors, advisors, and consultants of the Company typically vest over three or four years. Shares that are expired, terminated,
surrendered or canceled under the Plans without having been fully exercised will be available for future awards. In addition, shares of common stock that
are tendered to the Company by a participant to exercise an award are added to the number of shares of common stock available for the grant of awards.

2015 Employee, Director and Consultant Equity Incentive Plan— In 2015, the Board of Directors and shareholders of X4 adopted the 2015 Plan, which
provided for the Company to grant incentive stock options or nonqualified stock options, restricted

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X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

stock awards and other stock-based awards to employees, directors and consultants of the Company. Each stock option outstanding under the 2015 Plan at
the effective time of the Merger was automatically converted into a stock option exercisable for a number of shares of the Company’s common stock
calculated based on the Exchange Ratio and the exercise price per share of such outstanding stock option.

The total number of shares of common stock that may be issued under the 2015 Plan is 969,340 shares, adjusted for the Exchange Ratio and Reverse Stock
Split. Shares that are expired, forfeited, canceled or otherwise terminated without having been fully exercised will be available for future grant under the
2015 Plan. As of December 31, 2019, approximately 100,000 shares were available for future issuance under the 2015 Plan. In addition, shares of common
stock that are tendered to the Company by a participant to exercise an award are added to the number of shares of common stock available for future grants.

2017 Equity Incentive Plan— In 2017, the Board of Directors and shareholders of Arsanis adopted the 2017 Plan, which provided for the Company to
grant incentive stock options, non-qualified options, stock appreciation rights, restricted stock awards, restricted stock units and other stock-based awards.
Incentive stock options may be granted only to the Company’s employees, including officers and directors who are also employees. Awards other than
incentive stock options may be granted to employees, officers, members of the board of directors, advisors and consultants of the Company. The number of
shares of common stock reserved for issuance under this plan will automatically increase on January 1 of each year, through January 1, 2027, in an amount
equal to the lowest of 170,915 shares of the Company’s common stock (as adjusted for the Reverse Stock Split), 4.0% of the number of shares of the
Company’s common stock outstanding on January 1 of each year and an amount determined by the Company’s Board of Directors. As of December 31,
2019, approximately 20,000 shares were available for future issuance under the 2017 Plan.

Employee Stock Purchase Plan— In 2017, the Board of Directors and shareholders of Arsanis adopted the ESPP, which provides participating employees
with the opportunity to purchase shares of the Company’s common stock at defined purchase prices over six-month offering periods. For the twelve months
ended December 31, 2019, no shares of common stock were issued under the ESPP.

2019 Inducement Equity Incentive Plan— On June 17, 2019, the Board of Directors approved the adoption of the 2019 Plan, which provides for the
Company to grant nonqualified stock options, restricted stock awards and other stock-based awards to new employees of the Company. Awards issued from
the 2019 Plan are intended to be material inducements to each employee’s acceptance of employment with the Company in accordance with Nasdaq Listing
Rule 5635(c)(4). The total number of shares of common stock that may be issued under the 2019 Plan is 400,000 shares. Shares that are expired, forfeited,
canceled or otherwise terminated without having been fully exercised will be available for future grant under the 2019 Plan. In addition, shares of common
stock that are tendered to the Company by a participant to exercise an award are added to the number of shares of common stock available for future grants.
As of December 31, 2019, approximately 250,000 shares were available for future issuance under the 2019 Plan.

Stock Option Valuation— The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to
determine the grant-date fair value of stock options granted to employees, directors and non- employees:

Risk-free interest rate

Expected term (in years)

Expected volatility

Expected dividend yield

Stock Options

Year Ended
December 31,

2019

2018

2017

2.0  %

5.99

88.5  %

0  %

2.8  %

5.94

86.0  %

0  %

2.1  %

6.06

77.3  %

0  %

The following table summarizes the Company’s stock option activity for the twelve months ended December 31, 2019:

F-35

Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Outstanding as of December 31, 2018

Assumed as part of Merger with Arsanis

Granted

Exercised

Forfeited

Outstanding as of December 31, 2019

Exercisable as of December 31, 2019

Vested and expected to vest as of December 31, 2019

Number of
Shares

797,931    $

271,230   

589,110   

(51,617)  

(309,625)  

1,297,029    $

495,740    $

1,122,542    $

Weighted
Average
Exercise
Price

Weighted
Average
Contractual
Term (Years)

Aggregate
Intrinsic
Value

8.29   

62.60   

14.69   

7.05   

31.55   

17.05   

21.66   

17.15   

8.42 $

6,486   

8.41 $

7.21 $

8.32 $

1,286   

952   

1,245   

The aggregate intrinsic value of options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s
common stock for those options that had exercise prices lower than the fair value of the Company’s common stock. The aggregate intrinsic value of stock
options exercised during the twelve months ended December 31, 2019 was $363 thousand. The intrinsic value of options exercised during the years ended
December 31, 2018 and 2017 was not significant. The weighted average grant-date fair value per share of stock options granted during the years ended
December 31, 2019, 2018 and 2017 was $10.78, $7.05, and $4.74, respectively.

Restricted Stock Units— During the twelve months ended December 31, 2019, the Company granted 116,689 restricted stock units to employees at a
weighted average grant date fair value of $14.75 per share. The restricted stock units vest 25% annually on the grant anniversary over four years and had a
grant date fair value of $1.7 million, which will be recognized as stock-based compensation expense, net of estimated forfeitures, over the vesting period.

The following table summarizes the Company’s restricted stock activity for the twelve months ended December 31, 2019:

Unvested at December 31, 2018

Granted

Vested

Forfeited

Unvested at December 31, 2019

Number of Shares

—   

116,689  

—   

(14,916) 

101,773   

Stock-Based Compensation— Effective January 1, 2019, the Company adopted ASU 2018-7 and no longer remeasures the fair value of equity awards
granted to non-employees at each reporting period end (see Note 2).

As of December 31, 2019, total unrecognized compensation expense related to unvested stock options and restricted stock units was $6.4 million, which is
expected to be recognized over a weighted average period of 3.1 years.

Stock-based compensation expense was classified in the consolidated statements of operations as follows:

Research and development expense

General and administrative expense

Total stock-based compensation

Year Ended
December 31,

2018

2019

909    $

1,141   

2,050    $

258    $

501   

759    $

2017

126   

366   

492   

$

$

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Table of Contents

14. Income Taxes

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

During the years ended December 31, 2019, 2018, and 2017, the Company recorded no income tax benefits for the net operating losses incurred and
research and development credits generated due to the uncertainty of realizing a benefit from those items. The Company's losses before income taxes were
generated in the United States and Austria.

Loss before the provision for income taxes for the years ended December 31, 2019, 2018 and 2017 consisted of the following:

(in thousands)
United States

Foreign (Austria)

2019

2018

2017

Year Ended December 31,

$

$

(52,314)  

(493)  

(52,807)  

$

$

(33,285)  

—   

(33,285)  

$

$

(21,994)  

—   

(21,994)  

A reconciliation of the U.S. federal statutory income tax rate to the Company's effective income tax rate is as follows:

U.S. federal statutory income tax rate

State income taxes, net of federal benefit

Foreign rate differential

Research and development tax credits

Change in fair value of preferred stock warrant liability

Other permanent differences

Remeasurement of deferred taxes due to tax reform

Change in deferred tax asset valuation allowance

Other

Effective income tax rate

Net deferred tax assets as of December 31, 2019 and 2018 consisted of the following:

(in thousands)

Net operating loss carryforwards

Research and development tax credit carryforwards

Capitalized research and development expenses

Capitalized license fees

Accrual-to-cash basis conversion

Lease liabilities

Other

Total deferred tax assets

Valuation allowance

Deferred tax assets, net of valuation allowance

Right of use assets

Total deferred tax liabilities

Total deferred tax assets, net

$

$

$

$

F-37

Year Ended December 31,  

2019

2018

2017

(21.0) %

(21.0) %

(34.0) %

(5.8)

(0.1)

(1.1)

0.1 

1.4 

— 

26.8 

(0.3)

(6.2)

— 

(3.7)

2.4 

0.9 

— 

27.8 

(0.2)

(8.4)

— 

(1.8)

(2.2)

0.5 

27.8 

18.1 

— 

—  %

—  %

—  %

December 31,

2019

2018

65,487   

$

3,654   

2,626   

—   

—   

765   

1,413   

73,945   

(73,410)  

535   

535   

535   

—   

$

$

$

15,482   

2,710   

2,837   

221   

1,367   

—   

180   

22,797   

(22,797)  

—   

—   

—   

—   

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

As of December 31, 2019, the Company had U.S. federal and state net operating loss carryforwards of $181.8 million and $177.4 million, respectively,
which may be available to offset future taxable income and begin to expire in 2031 and 2035, respectively, and of which $127.7 million related to U.S
federal income taxes do not expire but are limited in their usage to an annual deduction equal to 80% of annual taxable income. In addition, as of December
31, 2019 the Company had foreign net operating loss carryforward of $64.4 million, which do not expire. U.S. federal and state net operating loss
carryforwards include $75 million and $70 million, respectively, of carryforwards acquired in the Merger with Arsanis, the utilization of which may be
subject to limitations as described below. As of December 31, 2019, the Company also had U.S. federal and state research and development tax credit
carryforwards of $3.1 million and $0.6 million, respectively, which may be available to offset future tax liabilities and each begin to expire in 2032 and
2030, respectively. As of December 31, 2019, uncertain tax position reserves recorded were $0.2 million for U.S. federal and state research and
development tax credits.

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 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 shareholders 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 U.S. 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.

Each period, the Company evaluates 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 its deferred tax
assets. Accordingly, a full valuation allowance has been established against the deferred tax assets as of December 31, 2019, 2018 and 2017.

Changes in the valuation allowance for deferred tax assets during the years ended December 31, 2019, 2018 and 2017 related primarily to the increases in
net operating loss carryforwards and research and development tax credit carryforwards and were as follows:

(in thousands)
Valuation allowance, beginning of year

Increases recorded to income tax provision

Acquisition of business

Valuation allowance, end of year

Year Ended December 31,

2019

2018

2017

(22,797)  

$

(13,546)  

$

(14,485)  

(36,128)  

(9,251)  

—   

(73,410)  

$

(22,797)  

$

(9,738)  

(3,808)  

—   

(13,546)  

$

$

The Company’s U.S. federal and state income tax returns are generally subject to tax examinations for the tax years ended December 31, 2016 through
December 31, 2019. There are currently no pending income tax examinations. 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 and state tax authorities to the extent utilized in a
future period. The Company’s policy is to record interest and penalties related to income taxes as part of its income tax provision.

F-38

Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

15. Net Loss per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follow:

Year Ended
December 31,

(in thousands, except per share data)

2019

2018

2017

Numerator:

Net loss

Accruing dividends on Series A convertible preferred stock

Adjustment to accumulated deficit in connection with repurchase of Series Seed
convertible preferred stock

Net loss attributable to common stockholders

Denominator:

Weighted average shares of common stock—basic and diluted

Net loss per share attributable to common stockholders— basic and diluted

$

$

$

(52,807)   $

(33,285)   $

(592)  

(3,000)  

(21,994)  

(3,000)  

—   

(22)  

—   

(53,399)   $

(36,307)   $

(24,994)  

11,530   

459   

(4.63)   $

(79.15)   $

458   

(54.58)  

The Company has included 107,371 shares of redeemable common stock in its computation of basic and diluted weighted average shares of common stock
outstanding for the years ended December 31, 2019, 2018 and 2017 as this class of stock participates in losses similarly to other common stockholders.
Basic and diluted weighted average shares of common stock outstanding for the year ended December 31, 2019 also includes the weighted average effect
of 2,130,000 and 1,750,000 prefunded warrants for the purchase of shares of common stock, which were issued in April 2019 and November 2019,
respectively, and for which the remaining unfunded exercise price is less than $0.001 per share.

The Company’s potentially dilutive securities included outstanding stock options, convertible preferred stock, and warrants to purchase shares of
convertible preferred stock for the year ended December 31, 2018 and included outstanding stock options and warrants to purchase common stock for the
year ended December 31, 2019. These potentially dilutive securities have been excluded from the computation of diluted net loss per share as the effect
would be to reduce the net loss per share, and thus they are considered “anti-dilutive.” Therefore, the weighted average number of common shares
outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the
following potential shares of common stock, presented based on amounts outstanding at each period end and adjusted for the Exchange Ratio and Reverse
Stock Split, 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 and unvested restricted stock units

Convertible preferred stock (as converted to common stock)
Warrants to purchase common stock (excluding prefunded warrants, which are included in

basic shares outstanding)

2019
1,398,802   

—   

9,776,871   

11,175,673   

Year Ended
December 31,

2018

798,311   

3,808,894   

489,079   

5,096,284   

2017

474,282   

3,613,069   

423,567   

4,510,918   

16. Loss on Transfer of Nonfinancial Assets

During the year ended December 31, 2019, the Company entered into contractual arrangements with two third parties that transferred the rights to develop
and commercialize the programs underlying IPR&D intangible assets acquired in the Merger. As of December 31, 2019, all programs underlying IPR&D
intangible assets acquired in the Merger were transferred to these third parties and the Company has no continuing involvement in any ongoing research
and development activities associated with the programs. The Company concluded that these third parties are "non-customers" as the underlying
development programs transferred to these third parties are focused on potential drug candidates that were not aligned with the Company's strategic focus
and, therefore, are not an output of the Company's ordinary activities. Accordingly, the Company accounted for these transactions under ASC Topic 610-
20, Gains and Losses from the Derecognition of Nonfinancial Assets ("ASC 610-20"). As a result of the transfer of control of the IPR&D projects to third
parties, the Company derecognized the IPR&D intangible assets through a

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Table of Contents

X4 PHARMACEUTICALS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

charge to "loss on transfer of nonfinancial assets" in 2019. The $3.9 million loss includes the carrying value of the IPR&D of $4.9 million, partially offset
by $1.0 million of non-refundable, upfront fees received from the third parties. In accordance with the contractual arrangements with these third parties, the
Company is entitled to future fees that are contingent on the success of the third parties in advancing the IPR&D project toward commercialization. These
future fees, if any, will be recognized in future periods as gains on the transfer of nonfinancial assets in accordance with ASC 610-20, which generally
provides that the fees would be recognized when it is probable that a future reversal of the fees that would be material to cumulative fees recognized to date
would not occur.

40

Exhibit 4.12

DESCRIPTION OF COMMON STOCK

The following description of our common stock and provisions of our restated certificate of incorporation, as amended, or restated certificate, and

amended and restated by-laws are summaries. You should also refer to the restated certificate and the amended and restated by-laws.

General

Our restated certificate authorizes us to issue up to 33,333,333 shares of common stock, $0.001 par value per share.

Holders of our common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders and do not have
cumulative voting rights. An election of directors by our stockholders shall be determined by a plurality of the votes cast by the stockholders entitled to
vote on the election. Holders of common stock are entitled to receive proportionately any dividends as may be declared by our board of directors, subject to
any preferential dividend rights of any series of preferred stock that we may designate and issue in the future.

In the event of our liquidation or dissolution, the holders of common stock are entitled to receive proportionately our net assets available for
distribution to stockholders after the payment of all debts and other liabilities and subject to the prior rights of any outstanding preferred stock. Holders of
common stock have no preemptive, subscription, redemption or conversion rights. There are no redemption or sinking fund provisions applicable to the
common stock. The rights, preferences and privileges of holders of common stock are subject to and may be adversely affected by the rights of the holders
of shares of any series of preferred stock that we may designate and issue in the future.

Registration Rights

Under the terms of a share purchase agreement with New Enterprise Associates 16, L.P., or NEA, we have granted NEA the right to require us to
register 333,333 shares of our common stock under the Securities subject to specified limitations set forth in such share purchase agreement. We are not
obligated to file a registration statement pursuant to this provision on more than two occasions. After registration pursuant to these rights, the registrable
securities will become freely tradable without restriction under the Securities Act. NEA’s registration rights will terminate upon the earlier to occur of
November 17, 2020 or the date on which NEA has sold all shares subject to NEA’s registration rights.

Pursuant to the share purchase agreement, we are required to pay all registration expenses, including all registration, filing and printing fees, issuer

counsel and accounting fees and expenses, costs and expenses associated with clearing the shares for sale under applicable Blue Sky laws, listing fees,
expenses incurred by us in connection with any “road show,” and reasonable fees, charges and disbursements of counsel to NEA, but excluding
underwriting discounts or commissions and fees with respect to the shares being sold.

The share purchase agreement contains customary cross-indemnification provisions, pursuant to which we are obligated to indemnify NEA in the

event of material misstatements or omissions in the registration statement attributable to us, and NEA is obligated to indemnify us for material
misstatements or omissions in the registration statement attributable to NEA.

Anti-Takeover Provisions

Section 203 of the Delaware General Corporation Law

We are subject to Section 203 of the DGCL, which prohibits a Delaware corporation from engaging in any business combination with any interested

stockholder for a period of three years after the date that such stockholder became an interested stockholder, with the following exceptions:

220948971 v2

 
 
•

•

•

  before such date, the board of directors of the corporation approved either the business combination or the transaction that resulted in the

stockholder becoming an interested stockholder;

  upon completion of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned
at least 85% of the voting stock of the corporation outstanding at the time the transaction began, excluding for purposes of determining
the voting stock outstanding, but not the outstanding voting stock owned by the interested stockholder, those shares owned (i) by persons
who are directors and also officers and (ii) employee stock plans in which employee participants do not have the right to determine
confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or

  on or after such date, the business combination is approved by the board of directors and authorized at an annual or special meeting of the
stockholders, and not by written consent, by the affirmative vote of at least 66 2/3% of the outstanding voting stock that is not owned by
the interested stockholder.

In general, Section 203 defines a “business combination” to include the following:

•

•

•

•

•

  any merger or consolidation involving the corporation and the interested stockholder;

  any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the interested stockholder;

  subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to

the interested stockholder;

  any transaction involving the corporation that has the effect of increasing the proportionate share of the stock or any class or series of the

corporation beneficially owned by the interested stockholder; or

  the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits by or

through the corporation.

In general, Section 203 defines an “interested stockholder” as an entity or person who, together with the person’s affiliates and associates,

beneficially owns, or within three years prior to the time of determination of interested stockholder status did own, 15% or more of the outstanding voting
stock of the corporation.

Staggered Board

Our restated certificate and by-laws divide our board of directors into three classes with staggered three year terms. In addition, our restated

certificate and by-laws provide that directors may be removed only for cause and only by the affirmative vote of the holders of 75% of our shares of capital
stock present in person or by proxy and entitled to vote. Under our restated certificate and by-laws, any vacancy on our board of directors, including a
vacancy resulting from an enlargement of our board of directors, may be filled only by vote of a majority of our directors then in office. Furthermore, our
restated certificate provides that the authorized number of directors may be changed only by the resolution of our board of directors, subject to the rights of
any holders of preferred stock to elect directors. The classification of our board of directors and the limitations on the ability of our stockholders to remove
directors, change the authorized number of directors and fill vacancies could make it more difficult for a third party to acquire, or discourage a third party
from seeking to acquire, control of us.

220948971 v2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Authorized but Unissued Shares

The authorized but unissued shares of common stock are available for future issuance without stockholder approval, subject to any limitations

imposed by the listing standards of any exchange on which our shares are listed. These additional shares may be used for a variety of corporate finance
transactions, acquisitions and employee benefit plans. The existence of authorized but unissued and unreserved common stock could make more difficult or
discourage an attempt to obtain control of us by means of a proxy contest, tender offer, merger or otherwise.

Special Meeting of Stockholders; Advance Notice Requirements for Stockholder Proposals and Director Nominations; Stockholder Action

Our restated certificate and restated by-laws provide that any action required or permitted to be taken by our stockholders at an annual meeting or
special meeting of stockholders may only be taken if it is properly brought before such meeting and may not be taken by written action in lieu of a meeting.
Our restated certificate and our restated by-laws also provide that, except as otherwise required by law, special meetings of the stockholders can only be
called by the chairman of our board of directors, our chief executive officer or our board of directors. In addition, our restated by-laws establish an advance
notice procedure for stockholder proposals to be brought before an annual meeting of stockholders, including proposed nominations of candidates for
election to our board of directors. Stockholders at an annual meeting may only consider proposals or nominations specified in the notice of meeting or
brought before the meeting by or at the direction of our board of directors, or by a stockholder of record on the record date for the meeting who is entitled
to vote at the meeting and who has delivered timely written notice in proper form to our secretary of the stockholder’s intention to bring such business
before the meeting. These provisions could have the effect of delaying until the next stockholder meeting stockholder actions that are favored by the
holders of a majority of our outstanding voting securities. These provisions also could discourage a third party from making a tender offer for our common
stock because even if the third party acquired a majority of our outstanding voting stock, it would be able to take action as a stockholder, such as electing
new directors or approving a merger, only at a duly called stockholders meeting and not by written consent.

Super Majority Voting

The DGCL provides generally that the affirmative vote of a majority of the shares entitled to vote on any matter is required to amend a corporation’s
certificate of incorporation or by-laws, unless a corporation’s certificate of incorporation or by-laws, as the case may be, require a greater percentage. Our
amended and restated by-laws may be amended or repealed by a majority vote of our board of directors or the affirmative vote of the holders of at least
75% of the votes that all of our stockholders would be entitled to cast in any election of directors. In addition, the affirmative vote of the holders of at least
75% of the votes that all of our stockholders would be entitled to cast in any election of directors is required to amend or repeal or to adopt any provisions
inconsistent with certain of the provisions of our restated certificate.

Exclusive Forum Selection

Our restated certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of

the State of Delaware shall be the sole and exclusive forum for (1) any derivative action or proceeding brought on behalf of our company, (2) any action
asserting a claim of breach of a fiduciary duty owed by any of our directors, officers, employees or stockholders to our company or our stockholders,
(3) any action asserting a claim arising pursuant to any provision of the General Corporation Law of the State of Delaware or as to which the General
Corporation Law of the State of Delaware confers jurisdiction on the Court of Chancery of the State of Delaware, or (4) any action asserting a claim arising
pursuant to any provision of our restated certificate or restated by-laws (in each case, as they may be amended from time to time) or governed by the
internal affairs doctrine. This exclusive forum provision would not apply to suits brought to enforce any liability or duty created by the Securities Act or the
Exchange Act or any other claim for which the federal courts have exclusive jurisdiction. To the extent that any such claims may be based upon federal law
claims, Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange
Act or the rules and regulations thereunder. Furthermore, Section 22 of the Securities Act creates

220948971 v2

concurrent jurisdiction for federal and state courts over all suits brought to enforce any duty or liability created by the Securities Act or the rules and
regulations thereunder. Although our restated certificate contains the choice of forum provision described above, it is possible that a court could rule that
such a provision is inapplicable for a particular claim or action or that such provision is unenforceable.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Computershare Trust Company, N.A., with offices at 250 Royall Street, Canton,

Massachusetts 02021.

Listing on Nasdaq

Our common stock is listed on the Nasdaq Capital Market under the symbol “XFOR.”

220948971 v2

 
EXECUTIVE EMPLOYMENT AGREEMENT

(subject to Board Compensation Committee Approval)

Exhibit 10.20

This Executive Employment Agreement (the “Agreement”), is made and entered into this 22nd day of April, 2019 (the “Effective Date”), and is

by and between X4 Pharmaceuticals, Inc. (“Company”), and E. Lynne Kelley, M.D. (“Executive”).

WHEREAS, Company wishes to employ Executive to serve as its Chief Medical Officer;

WHEREAS, Executive represents that Executive possesses the necessary skills to perform the duties of this position and that Executive has no

obligation to any other person or entity which would prevent, limit or interfere with Executive’s ability to do so; and

WHEREAS, Executive and Company desire to enter into a formal Executive Employment Agreement to assure the harmonious performance of

the affairs of Company.

NOW, THEREFORE, in consideration of the mutual promises, terms, provisions, and conditions contained herein, the parties agree as follows:

1. Title  and  Duties.  Subject  to  the  terms  and  conditions  of  this  Agreement,  Executive’s  position  with  Company  shall  be  Chief  Medical  Officer
(“CMO”) reporting to Company’s Chief Executive Officer (“CEO”). Executive accepts such employment upon the terms and conditions set forth
herein, and agrees to perform to the best of Executive’s ability the duties normally associated with such position and as reasonably determined by
Company  in  its  sole  discretion.  While  serving  as  CMO  hereunder,  Executive  shall  devote  all  of  Executive’s  business  time  and  energies  to  the
business  and  affairs  of  Company,  provided  that  nothing  contained  in  this  Section  1  shall  prevent  or  limit:  (a)  Executive’s  right  to  manage
Executive’s  personal  investments  on  Executive’s  own  personal  time,  including,  without  limitation  the  right  to  make  passive  investments  in  the
securities of (i) any entity which Executive does not control, directly or indirectly, and which does not compete with Company, or (ii) any publicly
held entity, so long as Executive’s aggregate direct and indirect interest does not exceed two percent (2%) of the issued and outstanding securities
of any class of securities of such publicly held entity; and (b) Executive’s participation in civic and charitable activities, including as a member of
a  board  of  a  civic  or  charitable  organization,  so  long  as  such  activities  do  not  interfere  with  Executive’s  performance  of  Executive’s  duties
hereunder.

2. Term; Termination.

a.

Term. Subject to the terms hereof, Executive’s employment hereunder shall commence on April 24, 2019 (the “Commencement Date”)
and shall continue until terminated hereunder by either party (such term of employment shall be referred to herein as the “Term”).

b.  Termination  by  Company.  Notwithstanding  anything  else  contained  in  this  Agreement,  Company  may  terminate  Executive’s  employment

hereunder as follows:
(i)    For  Cause.  Company  may  terminate  Executive’s  employment  for  Cause  (as  defined  below)  by  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 Executive has cured the circumstances giving rise
to Cause (as such cure right may be applicable pursuant to the terms and conditions set forth below) then such termination shall
not be effective.

(ii) Without Cause. Company may terminate Executive’s employment without Cause, by written notice by Company to Executive that
Executive’s employment is being terminated without Cause, which termination shall be effective on the date of such notice or
such later date as specified in writing by Company.

For  the  purposes  of  this  Agreement,  “Cause”  shall  mean:  (A)  fraud,  embezzlement,  or  illegal  misconduct  in  connection  with
Executive’s  duties  under  this  Agreement;  (B)  conviction  of  a  felony  involving  fraud,  dishonesty  or  breach  of  trust;  (C)  willful  misconduct  or  gross
negligence in the performance of the duties delegated to Executive; (D) breach of this Agreement; or (E) material breach of any non-competition, non-
solicitation, non- disclosure, and intellectual property assignment agreement between Executive and Company; provided that “Cause” shall not be deemed
to have occurred pursuant to subsection (D) hereof unless Executive has first received written notice specifying in reasonable detail the particulars of such
ground and that Company intends to terminate Executive’s employment hereunder for such ground, and if such ground is curable, Executive has failed to
cure such ground within a period of thirty (30) days from the date of her receipt of such notice.

c.  Termination  by  Executive.  Notwithstanding  anything  else  contained  in  this  Agreement,  Executive  may  terminate  Executive’s  employment

hereunder as follows:

i.

For Good Reason. Executive may terminate Executive’s employment for Good Reason (as defined below) by written notice by Executive
to Company that Executive is terminating Executive’s employment for Good Reason, which termination shall be effective thirty (30) days
after the date of such notice; provided that if Company has cured the circumstances giving rise to Good Reason then such termination
shall not be effective; or

ii Without Good Reason. Executive may terminate Executive’s employment without Good Reason by written notice by Executive to Company
that Executive is terminating Executive’s employment, which termination shall be effective ninety (90) days after the date of such notice.

For the purposes of this Agreement, “Good Reason” shall mean: (A) a material reduction in Executive’s then-current Base Salary; (B)
a material diminution in Executive’s authority, duties, or responsibilities; (C) a material change in the geographic location at which the Executive provides
services to Company outside of a fifty (50) mile radius from the then-current location; or (D) any action or inaction by Company that constitutes a material
breach of this Agreement; provided that “Good Reason” shall not be deemed to have occurred unless: (1) Executive provides Company with written notice
that Executive intends to terminate Executive’s employment hereunder for one of the grounds set forth above within thirty (30) days of such ground first
occurring, (2) 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  (3)  Executive  terminates  Executive’s  employment  within  seventy  five  (75)  days  from  the  date  that  Good  Reason  first  occurs.  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.

d Termination Due to Disability. Notwithstanding anything else contained in this Agreement, Company may terminate Executive’s employment
due  to  Executive’s  Disability  (as  defined  below)  by  written  notice  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. For the purposes of this Agreement, “Disability” shall mean Executive’s incapacity or inability to perform Executive’s duties
and responsibilities as contemplated herein for one hundred twenty (120) days or more within any one (1) year period (cumulative or
consecutive),  because  Executive’s  physical  or  mental  health  has  become  so  impaired  as  to  make  it  impossible  or  impractical  for
Executive to perform the duties and responsibilities contemplated hereunder. Determination of Executive’s physical or mental health shall
be determined by Company after consultation with a medical expert appointed by mutual agreement between Company and Executive
who has examined Executive. Executive hereby consents to such examination and consultation regarding Executive’s health and ability to
perform as aforesaid.

3. Compensation.

a. Base Salary. While Executive is employed hereunder, Executive shall earn a base salary at the annual rate of $410,000.00 (the “Base Salary”). The
Base Salary shall be payable in substantially equal periodic installments, on a bi- monthly basis, 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.

b.  Annual  Bonus.  Executive  shall  be  eligible  to  receive  an  annual  performance  bonus  (the  “Annual  Bonus”)  for  all  years  in  which  Executive  is
employed by Company hereunder. The Annual Bonus potential shall be in an amount no greater than 40% of Executive’s Base Salary. The amount
of  the  Annual  Bonus  shall  be  based  on  factors  such  as  Executive’s  work  performance,  Company’s  financial  performance,  Company’s  business
forecasts,  Company’s  determination  of  Executive’s  achievement  of  milestones  for  the  applicable  year,  and  economic  conditions  generally.  The
actual amount of the Annual Bonus shall be determined by Company in its sole discretion. The Annual Bonus shall be paid to Executive in no
event later than March 15th of the calendar year immediately following the calendar year to which it pertains. Executive must be employed by
Company at the time that the Annual Bonus is paid in order to be eligible for, and to be deemed as having earned, such Annual Bonus. Company
shall deduct from the Annual Bonus all amounts required to be deducted or withheld under applicable law or under any employee benefit plan in
which Executive participates.

c. Equity.  Pursuant  to  the  terms  of  the  Arsanis,  Inc.  2017  Equity  Incentive  Plan  (the  “Plan”),  and  subject  to  the  approval  of  Company’s  Board  of
Directors  (the  “Board”),  Employee  shall  be  eligible  to  receive  options  to  purchase  an  amount  of  37,170  shares  of  the  outstanding  shares  of
Company’s common stock on the date of grant (the “Stock Option”), at a per share exercise price equal to the Fair Market Value (as defined in the
Plan) of Company common stock on the date of grant. The Stock Option shall be, to the maximum extent permissible, treated as an “incentive
stock option” within the meaning of Section 422 of the Internal Revenue Code and the rules and regulations thereunder (collectively the “Code”).
The Stock Option shall be evidenced in writing by, and subject to the terms and conditions of, the Plan and Company’s standard form of stock
option  agreement,  which  agreement  shall  expire  ten  (10)  years  from  the  date  of  grant  (except  as  otherwise  provided  in  such  agreement  or  the
Plan). As more fully explained in the Plan and/or such stock agreement, twenty five percent (25%) of the shares subject to the Stock Option shall
vest on the first (1st) anniversary of the Commencement Date, and the remaining seventy five percent (75%) of such shares shall vest in equal
installments on the last day of each successive month thereafter for a period of thirty six (36) months, provided that Executive remains employed
by Company on the vesting date (except as otherwise provided in such agreement or the Plan).

d. Fringe Benefits. Executive shall be entitled to participate in all benefit/welfare plans and fringe benefits provided to employees at the same level as
Executive. 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.

e. Vacation. Executive shall be eligible to accrue up to twenty (20) days of vacation per year, to be scheduled to minimize disruption to Company’s
operations. Executive’s vacation use, accrual and carryover shall be subject to the terms and conditions of Company’s vacation policy 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 (“Section 409A”)
of  the  Code  and  the  rules  and  regulations  thereunder,  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 eligible for coverage under Company Directors’ and Officers’ (“D&O”) insurance policies to the same extent

and in the same manner to which Company’s

similarly situated executives are entitled to coverage under Company D&O insurance policies, subject to the terms and conditions of any such
Company D&O insurance policies.

a. Forfeiture/Clawback. All compensation described herein shall be subject to any forfeiture or clawback policy established by Company generally

for executives from time to time and any other such policy required by applicable law.

4. Termination Payments; Severance Benefit.

a. Payment of Accrued Obligations. Regardless of the reason for any employment termination hereunder, Company shall pay to Executive: (i) the
portion of Executive’s Base Salary that has accrued prior to any termination of Executive’s employment and has not yet been paid; (ii) the portion
of Executive’s vacation days that have accrued prior to any termination of Executive’s employment and has not yet been used; and (iii) the amount
of any expenses properly incurred by Executive on behalf of Company prior to any such termination and has not yet been reimbursed (together,
the “Accrued Obligations”) promptly following the effective date of termination, and otherwise within any timeframe required by law. Executive’s
entitlement  to  other  compensation  or  benefits  under  any  Company  plan  or  policy  shall  be  governed  by  and  determined  in  accordance  with  the
terms of such plan or policy, except as otherwise specified in this Agreement. In the event of Company’s termination of Executive’s employment
for Cause or Executive’s termination of Executive’s employment without Good Reason, Executive shall be eligible for the Accrued Obligations
and shall not be eligible for any severance or severance-type payments, other than as expressly set forth herein.

b. Severance in the Event of Termination Without Cause or Resignation for Good Reason. Subject to the terms and conditions of Section 4(d), in the event
that Executive’s employment hereunder is terminated by Company without Cause or terminated by Executive for Good Reason, then, in addition to the
Accrued Obligations:

i.

Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six (6) month period, with such
payments to be made in accordance with Company’s normal payroll practices and schedules, less all customary and required taxes and
employment-related deductions.

ii. Company shall pay Executive a pro-rata portion of Executive’s at-target Annual Bonus for the calendar year in which the termination occurs
based on the period worked by Executive during such calendar year prior to termination, with such payment to be made in on one lump sum in
accordance with Company’s normal payroll practices and schedules, less all customary and required taxes and employment-related deductions.

iii. In the event that Executive is eligible for coverage under a Company health insurance plan and Executive has elected to have coverage
thereunder and was covered thereunder prior to termination, and in the event that Executive chooses to exercise Executive’s right under the
Consolidated Omnibus Budget Reconciliation Act of 1985 (“COBRA”) to continue Executive’s participation in such plan, Company shall pay its
normal share of the costs for such coverage for a period of up to six (6) months from termination, to the same extent that such insurance is
provided to persons then currently employed by Company. Company shall deduct from each of the installments due under Section 4(b)(i) the
portion of the monthly premium due from Executive in accordance with the terms of such coverage. Notwithstanding any other provision of this
Agreement, this obligation shall cease on the date Executive becomes eligible to receive health insurance benefits through any other employer, and
Executive agrees to provide Company with written notice immediately upon becoming eligible for such benefits. Executive’s acceptance of any
payment on Executive’s behalf or coverage provided hereunder shall be an express representation to Company that Executive has no such
eligibility.

iv. Executive shall become vested in the additional number of outstanding time-based equity awards granted to Executive by Company that would
have otherwise vested had Executive remained in employment for an additional six (6) months after the termination date.

Subsections (i), (ii), (iii) and (iv) are referred to as the Severance Benefit. The Severance Benefit is expressly subject to the conditions described
above and in Section 4(d) below. Any payment or benefit made as part of such Severance Benefit shall be paid less all customary and required taxes and
employment-related deductions.

c. Accelerated Vesting in Event of Termination without Cause or Resignation for Good Reason Following Change of Control.  Subject  to  the  terms  and
conditions of Section 4(d), 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 Company terminates Executive’s employment without Cause or Executive resigns for Good Reason, then Executive automatically shall become
vested  in  one  hundred  percent  (100%)  of  outstanding  time-based  equity  awards  granted  to  Executive  by  Company.  The  above-described  vesting  is
expressly  subject  to  the  conditions  described  in  Section  4(d),  and  shall  be  provided  less  all  customary  and  required  taxes  and  employment-related
deductions. For purposes of this section, 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 which the Board does not approve;
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; or (B) the sale or disposition by Company of all or substantially all of Company’s assets.

d. Conditions. Company shall not be obligated to provide Executive any payment, benefit and/or vesting described in Section 4(b) or Section 4(c) unless
and until Executive has executed without revocation a separation agreement in a form acceptable to Company, which must be signed by Executive, returned
to Company and be enforceable and irrevocable no later than sixty (60) days following Executive’s separation from service (the “Review Period”), and
which shall include, at a minimum, the provision of separation pay and benefits due from Company to Executive as applicable, a complete general release
of claims against Company and its affiliated entities and each of their officers, directors and employees, and terms relating to non- disparagement, non-
competition,  confidentiality,  cooperation  and  the  like  similar  in  scope,  duration  and  substance  to  those  terms  set  forth  in  Company’s  Non-Competition,
Non-Solicitation,  Non-Disclosure,  and  Intellectual  Property  Agreement  described  in  Section  5  below.  If  Executive  executes  and  does  not  revoke  such
agreement  within  the  Review  Period,  then  provision  of  payments,  benefits  and/or  vesting  shall  commence  on  the  first  (1st)  day  following  the  Review
Period,  provided  that  if  the  last  day  of  the  Review  Period  occurs  in  the  calendar  year  following  the  year  of  termination,  then  the  payment  shall  not
commence until January 2 of such subsequent calendar year, and further provided that, as applied to Section 4(b)(i), (ii) and (iii) as applicable, the first
payments/benefits shall include in a lump sum all amounts that were otherwise payable to Executive from the date of Executive’s separation from service
occurred through such first payment. As stated in Company’s Non-Competition, Non-Solicitation, Non-Disclosure, and Intellectual Property Agreement, in
the event Executive is eligible for garden leave or analogous payments in support of non-competition obligations, then Company reserves the right to offset
the Severance Benefit with such garden leave or analogous payments to the extent permitted by applicable law.

e. COBRA. If the payment of any COBRA or health insurance premiums by Company on behalf of Executive as described herein would otherwise violate
any applicable nondiscrimination rules or cause the reimbursement of claims to be taxable under the Patient Protection and Affordable Care Act of 2010,
together with the Health Care and Education Reconciliation Act of 2010 (collectively, the “Act”) or Section 105(h) of the Code, the COBRA premiums
paid  by  Company  shall  be  treated  as  taxable  payments  (subject  to  customary  and  required  taxes  and  employment-related  deductions)  and  be  subject  to
imputed income tax treatment to the extent necessary to eliminate any discriminatory treatment or taxation under the Act or Section 105(h) of the Code. If
Company  determines  in  its  sole  discretion  that  it  cannot  provide  the  COBRA  benefits  described  herein  under  Company’s  health  insurance  plan  without
potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), Company shall in lieu thereof provide to
Executive a taxable lump-sum payment in an amount equal to the sum of the monthly (or then remaining) COBRA premiums that Executive would be
required to pay to maintain

Executive’s group health insurance coverage in effect on the separation date for the remaining portion of the period for which Executive shall receive the
payments described in Sections 4(b) or 4(c) above.

f.  No  Other  Payments  or  Benefits  Owing.  The  payments  and  benefits  set  forth  in  this  Section  4  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.  The  payments  and  benefits  set  forth  in  this  Section  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.

5. Non-Competition, Non-Solicitation, Non-Disclosure Agreement. In light of the competitive and proprietary aspects of the business of Company, and as a
condition of Executive’s employment hereunder, Executive agrees to sign and abide by Company’s Non-Competition, Non- Solicitation, Non-Disclosure,
and Intellectual Property Agreement.

6. Code Sections 409A and 280G.

a.

In the event that the payments or benefits set forth in Section 4 constitute “non- qualified deferred compensation” subject to Section 409A, then
the following conditions apply to such payments or benefits:

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  6(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 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:
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.

7. 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 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:

X4 Pharmaceuticals, Inc.
955 Massachusetts Ave., 4th Floor Cambridge, MA 02139
Attention: Chair, Board of Directors

with a copy to:

Mintz, Levin, Cohn, Ferris, Glovsky & Popeo, P.C.

One Financial Center Boston, MA, 02111
Attn: John J. Cheney, Esq.

b Modifications and Amendments. The terms and provisions of this Agreement may be modified or amended only by written agreement executed by the
parties hereto.

c. Waivers  and  Consents.  The  terms  and  provisions  of  this  Agreement  may  be  waived,  or  consent  for  the  departure  therefrom  granted,  only  by  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.

e. Governing Law; Jury Waiver. This Agreement and the rights and obligations of the parties hereunder shall be construed in accordance with and governed
by the law 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 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  exclusive
jurisdiction of the aforesaid courts. 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. 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.

h. 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.

[Signature Page to Follow]

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first written above.

E. LYNNE KELLEY, M.D.

/s/ E. Lynne Kelley

Printed name

/s/ E. Lynne Kelley

Signature

X4 PHARMACEUTICALS

/s/ Paula M. Ragan

By:

Name: Paula M. Ragan

Title: CEO

AMENDMENT TO AMENDED AND RESTATED EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.17

This amendment (this “Amendment”) to that certain Amended and Restated Executive Employment Agreement, dated March 13, 2019, (the
“Agreement”) by and between Paula Ragan, Ph.D (“Employee”) and X4 Pharmaceuticals, Inc. (the “Company”) is entered into as of this 13th
day of February, 2020.

WHEREAS,  on  February  10,  2020,  the  Compensation  Committee  of  the  Board  of  Directors  of  the  Company  (the  “Board”)  voted  to  adjust
certain aspects of Employee’s compensation terms; and

WHEREAS, the parties wish to amend the Agreement to reflect the Board’s decision.

In  consideration  and  in  furtherance  of  Employee’s  continued  at-will  employment  with  the  Company,  Employee  and  the  Company  agree  as
follows:

The below existing language in Section 2(c)(ii) in the Agreement shall be entirely replaced by the replacement language beneath it, and,

1.
for avoidance of doubt, all other language in Section 2(c)(ii) shall remain unchanged:

Existing language: “For the purposes of this Agreement, “Good Reason” shall mean: (A) a material reduction in Executive’s then-current Base
Salary; (B) a material diminution in Executive’s authority, duties, or responsibilities;
(C) a material change in the geographic location at which the Executive provides services to Company outside of a fifty (50) mile radius from
the then-current location; or (D) any action or inaction by Company that constitutes a material breach of this Agreement; provided that “Good
Reason” shall not be deemed to have occurred unless: (1) Executive provides Company with written notice that Executive intends to terminate
Executive’s employment hereunder for one of the grounds set forth above within thirty (30) days of such ground first occurring, (2) 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 (3) Executive terminates Executive’s employment within seventy five (75) days from the date that Good Reason first occurs. 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.”

Replacement language: “For the purposes of this Agreement, “Good Reason” for resignation from employment with the Company means that
any of the following actions are taken by the Company without Executive’s prior written consent: (A) a material reduction in Executive’s base
salary,  which  the  parties  agree  is  a  reduction  of  at  least  10%  of  Executive’s  base  salary  (unless  pursuant  to  a  salary  reduction  program
applicable  generally  to  the  Company’s  similarly  situated  employees);  or  (B)  a  material  reduction  in  Executive’s  duties,  position  or
responsibilities;  or  (C)  relocation  of  Executive’s  principal  place  of  employment  to  a  place  that  increases  Executive’s  one-way  commute  by
more  than  sixty  (60)  miles  as  compared  to  Executive’s  then-current  principal  place  of  employment  immediately  prior  to  such  relocation.  In
order to resign for Good Reason, Executive must provide written notice to the Company’s CEO within 30 days after the first occurrence of the
event giving rise to Good Reason setting forth the basis for Executive’s resignation, allow the Company at least 30 days from receipt of such
written  notice  to  cure  such  event,  and  if  such  event  is  not  reasonably  cured  within  such  period,  Executive  must  resign  from  all  positions
Executive then holds with the Company not later than 90 days after the expiration of the cure period.”

The below existing language in Section 4(b)(i) and (4(b)(ii) of the Agreement shall be entirely replaced by the replacement language

2.
beneath it:

Existing language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six (6) month
period, with such payments to be made in accordance with Company’s normal payroll practices and schedules, less all customary and required
taxes and employment-related deductions.

(ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual  Bonus  for  the  calendar  year  in  which  the  termination
occurs based on the period worked by Executive during such calendar year prior to termination, with such payment to be made in on one lump
sum  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all  customary  and  required  taxes  and  employment-related
deductions.

Replacement language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six (6)
month  period,  with  such  payments  to  be  made  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all  customary  and
required taxes and employment-related deductions; provided, however, that if Executive’s resignation or termination under this Section occurs
within  twelve  (12)  months  after  a  Change  of  Control  (as  defined  below),  then  the  Company  shall  instead  pay  Executive  an  amount  equal  to
continuation  of  Executive’s  monthly  Base  Salary  for  an  eighteen  (18)  month  period,  with  such  payments  to  be  made  in  accordance  with
Company’s normal payroll practices and schedules, less all customary and required taxes and employment-related deductions.

(ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual  Bonus  for  the  calendar  year  in  which  the  termination
occurs based on the period worked by Executive during such calendar year prior to termination, with such payment to be made in on one lump
sum  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all  customary  and  required  taxes  and  employment-related
deductions;  provided,  however,  that  if  Executive’s  resignation  or  termination  under  this  Section  occurs  within  twelve  (12)  months  after  a
Change of Control (as defined below), then the Company shall instead pay Executive an amount equal to Executive’s full Annual Bonus for the
calendar year in which the termination occurs in advance of such Annual Bonus being earned, with such payment to be made in on one lump
sum  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all  customary  and  required  taxes  and  employment-related
deductions.

This  Amendment  may  be  executed  in  several  counterparts,  all  of  which  taken  together  shall  constitute  one  single  agreement  between  the
parties. Except as amended hereby, all of the terms and conditions of the Agreement shall remain and continue in full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

X4 Pharmaceuticals, Inc.

Paula Ragan, Ph.D, an individual

By: /s/ Michael Wyzga

Name: Michael Wyzga

Title: Chairman of the Board

 /s/ Paula Ragan

Paula Ragan, Ph.D

AMENDMENT TO AMENDED AND RESTATED EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.19

This  amendment  (this  “Amendment”)  to  that  certain  Amended  and  Restated  Executive  Employment  Agreement,  dated  March  13,
2019 (the “Employment Agreement”), as amended by the Severance Plan Addendum to Executive Employment Agreement adopted
by the Board of Directors on September 18, 2019 (the “Plan Addendum”) (collectively, the “Mostafa Agreement”) by and between
Adam S. Mostafa, MD, FACS (“Employee”)  and  X4  Pharmaceuticals,  Inc.  (the  “Company”)  is  entered  into  as  of  this  24th  day  of
February, 2020.

WHEREAS, on February 10, 2020, the Compensation Committee of the Board of Directors of the Company (the “Board”) voted to
adjust certain aspects of Employee’s compensation terms; and

WHEREAS, the parties wish to amend the Employment Agreement to reflect the Board’s decision.

In  consideration  and  in  furtherance  of  Employee’s  continued  at-will  employment  with  the  Company,  Employee  and  the  Company
agree as follows:

The below existing language in Section 2(c)(ii) in the Employment Agreement shall be entirely replaced by the replacement

1.
language beneath it, and, for avoidance of doubt, all other language in Section 2(c)(ii) shall remain unchanged:

Existing language: “For the purposes of this Agreement, “Good Reason” shall mean: (A) a material reduction in Executive’s then-
current  Base  Salary;  (B)  a  material  diminution  in  Executive’s  authority,  duties,  or  responsibilities;  (C)  a  material  change  in  the
geographic location at which the Executive provides services to Company outside of a fifty (50) mile radius from the then-current
location;  or  (D)  any  action  or  inaction  by  Company  that  constitutes  a  material  breach  of  this  Agreement;  provided  that  “Good
Reason” shall not be deemed to have occurred unless: (1) Executive provides Company with written notice that Executive intends to
terminate  Executive’s  employment  hereunder  for  one  of  the  grounds  set  forth  above  within  thirty  (30)  days  of  such  ground  first
occurring, (2) 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 (3) Executive terminates Executive’s employment within seventy five (75) days from the
date  that  Good  Reason  first  occurs.  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.”

        Replacement language: “For the purposes of this Agreement, “Good Reason” for resignation from employment with the Company
means that any of the following actions are taken by the Company without Executive’s prior written consent: (A) a material reduction
in  Executive’s  base  salary,  which  the  parties  agree  is  a  reduction  of  at  least  10%  of  Executive’s  base  salary  (unless  pursuant  to  a
salary  reduction  program  applicable  generally  to  the  Company’s  similarly  situated  employees);  or  (B)  a  material  reduction  in
Executive’s  duties,  position  or  responsibilities;  or  (C)  relocation  of  Executive’s  principal  place  of  employment  to  a  place  that
increases Executive’s one-way commute by more than sixty (60) miles as compared to Executive’s then-current principal place of
employment immediately prior to such relocation. In order to resign for Good Reason, Executive must provide written notice to the
Company’s  CEO  within  30  days  after  the  first  occurrence  of  the  event  giving  rise  to  Good  Reason  setting  forth  the  basis  for
Executive’s resignation, allow the Company at least 30 days from receipt of such written notice to cure such event, and if such event
is not reasonably cured within such period, Executive must resign from all positions Executive then holds with the Company not later
than 90 days after the expiration of the cure period.”

The below existing language in Section 4(b)(i) and 4(b)(ii) of the Employment Agreement shall be entirely replaced by the

2.
replacement language beneath it:

Existing language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six
(6)  month  period,  with  such  payments  to  be  made  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all
customary and required taxes and employment-related deductions.

(ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual  Bonus  for  the  calendar  year  in  which  the
termination occurs based on the period worked by Executive during such calendar year prior to termination, with such payment to be
made in on one lump sum in accordance with Company’s normal payroll practices and schedules, less all customary and required
taxes and employment-related deductions.

Replacement language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for
a six (6) month period, with such payments to be made in accordance with Company’s normal payroll practices and schedules, less
all  customary  and  required  taxes  and  employment-related  deductions;  provided,  however,  that  if  Executive’s  resignation  or
termination under this Section occurs within twelve (12) months after a Change of Control (as defined below), then the Company
shall instead pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a twelve (12) month period, with
such payments to be made in accordance with Company’s normal payroll practices and schedules, less all customary and required
taxes and employment-related deductions.

(ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual  Bonus  for  the  calendar  year  in  which  the
termination occurs based on the period worked by Executive during such calendar year prior to termination, with such payment to be
made in on one lump sum in accordance with Company’s normal payroll practices and schedules, less all customary and required
taxes and employment-related deductions; provided, however, that if Executive’s resignation or termination under this Section occurs
within twelve (12) months after a Change of Control (as defined below), then the Company shall instead pay Executive an amount
equal to Executive’s full Annual Bonus for the calendar year in which the termination occurs in advance of such Annual Bonus being
earned, with such payment to be made in on one lump sum in accordance with Company’s normal payroll practices and schedules,
less all customary and required taxes and employment-related deductions.

For avoidance of doubt, this Amendment shall supersede Sections 4.1.1 and 4.1.3 of the Plan Addendum and the parties acknowledge
and agree that the amendments to the Plan Addendum described herein shall only apply to Employee.

This Amendment may be executed in several counterparts, all of which taken together shall constitute one single agreement between
the parties. Except as amended hereby, all of the terms and conditions of the Employment Agreement and the Mostafa Agreement
shall remain and continue in full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

X4 Pharmaceuticals, Inc.

Adam S. Mostafa, an individual

By:___/s/ Paula Ragan__________
Name: Paula Ragan 
Title: President and CEO

/s/ Adam Mostafa_________________________
Adam S. Mostafa

AMENDMENT TO EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.21

This amendment (this “Amendment”) to that certain Executive Employment Agreement, dated April 22, 2019 (the “Employment Agreement”), as amended
by the Severance Plan Addendum to Executive Employment Agreement adopted by the Board of Directors on September 18, 2019 (the “Plan Addendum”)
(collectively,  the  “Kelley Agreement”)  by  and  between  E.  Lynne  Kelley,  MD,  FACS  (“Employee”)  and  X4  Pharmaceuticals,  Inc.  (the  “Company”)  is
entered into as of this 5th day of March, 2020.

WHEREAS, on February 10, 2020, the Compensation Committee of the Board of Directors of the Company (the “Board”) voted to adjust certain aspects of
Employee’s compensation terms; and

WHEREAS, the parties wish to amend the Employment Agreement to reflect the Board’s decision.

In consideration and in furtherance of Employee’s continued at-will employment with the Company, Employee and the Company agree as follows:

1. The below existing language in Section 2(c)(ii) in the Employment Agreement shall be entirely replaced by the replacement language beneath it, and,

for avoidance of doubt, all other language in Section 2(c)(ii) shall remain unchanged:

Existing language: “For the purposes of this Agreement, “Good Reason” shall mean: (A) a material reduction in Executive’s then-current Base Salary; (B)
a material diminution in Executive’s authority, duties, or responsibilities; (C) a material change in the geographic location at which the Executive provides
services to Company outside of a fifty (50) mile radius from the then-current location; or (D) any action or inaction by Company that constitutes a material
breach of this Agreement; provided that “Good Reason” shall not be deemed to have occurred unless: (1) Executive provides Company with written notice
that Executive intends to terminate Executive’s employment hereunder for one of the grounds set forth above within thirty (30) days of such ground first
occurring, (2) 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  (3)  Executive  terminates  Executive’s  employment  within  seventy  five  (75)  days  from  the  date  that  Good  Reason  first  occurs.  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.”
Replacement language: “For the purposes of this Agreement, “Good Reason” for resignation from employment with the Company means that any of the
following  actions  are  taken  by  the  Company  without  Executive’s  prior  written  consent:  (A)  a  material  reduction  in  Executive’s  base  salary,  which  the
parties agree is a reduction of at least 10% of Executive’s base salary (unless pursuant to a salary reduction program applicable generally to the Company’s
similarly situated employees); or (B) a material reduction in Executive’s duties, position or responsibilities; or (C) relocation of Executive’s principal place
of employment to a place that increases Executive’s one-way commute by more than sixty (60) miles as compared to Executive’s then-current principal
place of employment immediately prior to such relocation. In order to resign for Good Reason, Executive must provide written notice to the Company’s
CEO  within  30  days  after  the  first  occurrence  of  the  event  giving  rise  to  Good  Reason  setting  forth  the  basis  for  Executive’s  resignation,  allow  the
Company at least 30 days from receipt of such written notice to cure such event, and if such event is not reasonably cured within such period, Executive
must resign from all positions Executive then holds with the Company not later than 90 days after the expiration of the cure period.”

2.  The  below  existing  language  in  Section  4(b)(i)  and  4(b)(ii)  of  the  Employment  Agreement  shall  be  entirely  replaced  by  the  replacement  language

beneath it:

Existing language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six (6) month period, with
such payments to be made in accordance with Company’s normal payroll practices and schedules, less all customary and required taxes and employment-
related  deductions.  (ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual  Bonus  for  the  calendar  year  in  which  the
termination occurs based on the period worked by Executive during such calendar year prior to termination, with

such payment to be made in on one lump sum in accordance with Company’s normal payroll practices and schedules, less all customary and required taxes
and employment-related deductions.

Replacement language: “(i) Company shall pay Executive an amount equal to continuation of Executive’s monthly Base Salary for a six (6) month period,
with  such  payments  to  be  made  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all  customary  and  required  taxes  and
employment-related deductions; provided, however, that if Executive’s resignation or termination under this Section occurs within twelve (12) months after
a  Change  of  Control  (as  defined  below),  then  the  Company  shall  instead  pay  Executive  an  amount  equal  to  continuation  of  Executive’s  monthly  Base
Salary  for  a  twelve  (12)  month  period,  with  such  payments  to  be  made  in  accordance  with  Company’s  normal  payroll  practices  and  schedules,  less  all
customary  and  required  taxes  and  employment-related  deductions.  (ii)  Company  shall  pay  Executive  a  pro-rata  portion  of  Executive’s  at-target  Annual
Bonus for the calendar year in which the termination occurs based on the period worked by Executive during such calendar year prior to termination, with
such payment to be made in on one lump sum in accordance with Company’s normal payroll practices and schedules, less all customary and required taxes
and employment-related deductions; provided, however, that if Executive’s resignation or termination under this Section occurs within twelve (12) months
after a Change of Control (as defined below), then the Company shall instead pay Executive an amount equal to Executive’s full Annual Bonus for the
calendar  year  in  which  the  termination  occurs  in  advance  of  such  Annual  Bonus  being  earned,  with  such  payment  to  be  made  in  on  one  lump  sum  in
accordance with Company’s normal payroll practices and schedules, less all customary and required taxes and employment-related deductions.

For avoidance of doubt, this Amendment shall supersede Sections 4.1.1 and 4.1.3 of the Plan Addendum and the parties acknowledge and agree that the
amendments to the Plan Addendum described herein shall only apply to Employee.

This Amendment may be executed in several counterparts, all of which taken together shall constitute one single agreement between the parties. Except as
amended  hereby,  all  of  the  terms  and  conditions  of  the  Employment  Agreement  and  the  Kelley  Agreement  shall  remain  and  continue  in  full  force  and
effect.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

X4 Pharmaceuticals, Inc.

E. Lynne Kelley, MD, FACS an individual

By: /s/ Paula M. Ragan

Name: Paula M. Ragan, Ph.D.

Title: CEO

/s/ Lynne Kelley

E. Lynne Kelley, MD, FACS

EXECUTIVE EMPLOYMENT AGREEMENT

Exhibit 10.22

THIS EXECUTIVE EMPLOYMENT AGREEMENT (this “Agreement”) is entered into as of September 25, 2019, (the “Effective Date”) by
and between X4 Pharmaceuticals, Inc. (the “Company”), and Derek M. Meisner (“Executive”) (collectively referred to as the “Parties” or individually
referred to as a “Party”).

WHEREAS, the Company desires to employ Executive as its General Counsel, and to enter into an agreement embodying the terms of such

employment;

R E C I T A L S

WHEREAS, Executive desires to accept such employment and enter into such an agreement.

A G R E E M E N T

NOW, THEREFORE, in consideration of the premises and mutual covenants herein and for other good and valuable consideration, the Parties

agree as follows:

1.

Duties and Scope of Employment.

(a)

Positions  and  Duties.  As  of  November  4,  2019,  Executive  will  serve  as  General  Counsel  of  the  Company.  Executive  will
render such business and professional services in the performance of Executive’s duties, consistent with Executive’s position within the Company, as
shall reasonably be assigned to Executive by the Company’s Chief Executive Officer. The period of Executive’s at-will employment under the terms of
this Agreement is referred to herein as the “Employment Term.”

(b)

Obligations. During the Employment Term, Executive will perform Executive’s duties faithfully and to the best of Executive’s
ability and will devote Executive’s full business efforts and time to the Company. For the duration of the Employment Term, Executive agrees not to
actively engage in any other employment, occupation or consulting activity, for any direct or indirect remuneration, that may create a conflict of interest
or interfere with Executive’s duties to the Company, without the prior approval of the Company’s Chief Executive Officer

(c)

No Conflicts. As a condition of Executive’s employment, Executive certifies to the Company that: (a) Executive is free to enter
into  and  fully  perform  the  duties  of  Executive’s  position;  (b)  Executive  is  not  subject  to  any  employment,  confidentiality,  non-competition  or  other
agreement that would restrict Executive’s performance for the Company; (c) Executive’s signing this Agreement does not violate any order, judgment or
injunction applicable to Executive, or conflict with or breach any agreement to which Executive is a party or by which Executive is bound; and (d) all
facts Executive has presented to the Company are accurate and true, including, but not limited to, all oral and written statements Executive has made
(including those pertaining to Executive’s education, training, qualifications, licensing and prior work experience) in any job application, resume, c.v.,
interview or discussion with the Company.

(d)

At-Will Employment. Subject to Sections 7, 8, and 9 below, The parties agree that Executive's employment with the Company
will be “at-will” employment and may be terminated at any time with or without cause or notice, for any reason or no reason. Executive understands and
agrees that neither Executive’s job performance nor promotions, commendations, bonuses or the like from the Company give rise to or in any way serve
as the basis for modification, amendment, or extension, by implication or otherwise, of Executive’s employment with the Company.

3. Compensation.

a.

Base Salary. During the Employment Term, the Company will pay Executive as compensation for Executive’s services
a base salary at a rate of $400,000.00 per year, as modified from time to time at the discretion of the Company (the “Base Salary”). The Base
Salary will be paid in regular installments in accordance with the Company’s normal payroll practices (subject to required withholding). Any
increase or decrease in Base Salary (together with the then existing Base Salary) shall serve as the “Base Salary” for future employment under
this Agreement. The first and last payment will be adjusted, if necessary, to reflect a commencement or termination date other than the first or
last working day of a pay period.

b.

Start  Bonus.  Executive  will  also  be  eligible  to  earn  a  one-time  bonus  of  $135,000.00,  less  applicable  withholdings

(“Start Bonus”). The Company will pay Executive 50% of the Start Bonus, in advance of being earned, within

thirty (30) days after the Effective Date, and the other 50% of the Start Bonus on or about the same date that the Company pays annual bonuses
to employees in approximately March 2020. Executive will earn each portion of the Start Bonus if Executive remains continuously employed
with  the  Company  through  the  one-year  anniversary  of  the  applicable  payment  date  of  such  portion.  If  Executive’s  employment  with  the
Company  terminates  for  any  reason  (except  by  the  Executive  for  Good  Reason,  as  defined  below)  prior  to  the  one-year  anniversary  of  the
applicable  payment  date  of  such  portion,  Executive  agrees  to  repay  such  unearned  portion(s)  with  thirty  (30)  days  after  the  date  Executive’s
employment terminates.

c.

Annual Bonus. Executive will also be eligible to earn an annual discretionary bonus with a target amount equal to 40%
of the Base Salary (“Target Bonus”). The amount of this bonus, if any, will be determined in the sole discretion of the Company and based, in
part, on Executive’s performance and the performance of the Company during the calendar year. The Company will pay Executive this bonus, if
any,  by  no  later  than  March  15th  of  the  following  calendar  year.  The  bonus  is  not  earned  until  paid  and  no  pro-rated  amount  will  be  paid  if
Executive’s employment terminates for any reason prior to the payment date.

d.

Stock Option.  In  connection  with  the  commencement  of  Executive’s  employment  and  subject  to  the  approval  of  the
Board of Directors of the Company or the Compensation Committee thereof, the Company will grant Executive a non-qualified stock option (the
“Option”) for the purchase of an aggregate of 55,000 shares of Common Stock of the Company at a price per share equal to the fair market value
on the date of grant, as an inducement material to Executive joining the Company, pursuant to Rule 5635(c)(4) of the Nasdaq Listed Company
Manual, under the Company’s 2019 Inducement Equity Incentive Plan (the “Plan”). The Option shall be subject to all terms, vesting, and other
provisions set forth in a separate option agreement under the Plan. The Option will have a term of 10 years, except as set forth in the option
agreement and the Plan, and be subject to a vesting schedule of four years, with 25% of the shares vesting on the first anniversary of Executive’s
employment  start  date  and  the  remainder  vesting  in  equal  installments  over  the  following  36  months,  provided,  that  Executive  remains
continuously employed by the Company on such vesting dates.

1.

Executive will be eligible to receive awards of stock options, restricted stock or other equity awards pursuant
to any plans or arrangements the Company may have in effect from time to time. The Board or a committee of the Board shall determine
in its discretion whether Executive shall be granted any such equity awards and the terms of any such award in accordance with the
terms of any applicable plan or arrangement that may be in effect from time to time.

4. Employee Benefits. During the Employment Term, Executive may take advantage of various benefits offered by the Company, such as group
medical insurance, dental insurance, short-term disability, long- term disability and the Company’s 401(k) plan. Executive will also be entitled to
fifteen (15) days of paid time off per year, as well as two (2) personal days and eleven (11) paid holidays, exclusive of any sick days Executive
may need. These benefits may be modified or changed from time to time at the sole discretion of the Company. The details of the Company’s full
benefit offerings can be found in its Employee Handbook.
5. Business Expenses.  During  the  Employment  Term,  the  Company  will  reimburse  Executive  for  reasonable  business  travel,  entertainment  or
other business expenses incurred by Executive in the furtherance of or in connection with the performance of Executive’s duties hereunder, in
accordance with the Company’s expense reimbursement policy as in effect from time to time. All reimbursements provided under this Agreement
will be made or provided in accordance with the requirements of Section 409A of the Internal Revenue Code (“Section 409A”) and the rules and
regulations  thereunder,  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.
6. Termination on Death or Disability.

a. Effectiveness. Executive’s employment will terminate automatically upon Executive’s Death or, upon fourteen (14) days prior

written notice from the Company, in the event of Disability.
Effect of Termination. Upon any termination for death or Disability, Executive shall be entitled to: (i) Executive’s Base Salary through
the effective date of termination; (ii) the right to continue health care benefits under Title X of the Consolidated Budget Reconciliation Act of
1985,  as  amended  (“COBRA”),  at  Executive’s  cost,  to  the  extent  required  and  available  by  law;  (iii)  reimbursement  of  expenses  for  which
Executive  is  entitled  to  be  reimbursed  pursuant  to  Section  6  above,  but  for  which  Executive  has  not  yet  been  reimbursed;  and  (iv)  no  other
severance or benefits of any kind, unless required by law or pursuant to any other written Company plans or policies, as then in effect.

7. Involuntary Termination for Cause; Resignation without Good Reason.

a. Effectiveness. Notwithstanding any other provision of this Agreement, the Company may terminate Executive’s employment at any
time for Cause or Executive may resign from Executive’s employment with the Company at any time without Good Reason. Termination for
Cause, or Executive’s resignation without Good Reason, shall be effective on the date either Party gives notice to the other Party of such
termination in accordance with this Agreement unless otherwise agreed by the Parties. In the event that the Company accelerates the effective
date of a resignation, such acceleration shall not be construed as a termination of Executives employment by the Company or deemed Good
Reason for such resignation.

b. Effect of Termination. In the case of the Company’s termination of Executive’s employment for Cause, or Executive’s resignation

without Good Reason, Executive shall be entitled to receive: (i) Base Salary through the effective date of the termination or resignation, as
applicable; (ii) reimbursement of all business expenses for which Executive is entitled to be reimbursed pursuant to Section 6 above, but for
which Executive has not yet been reimbursed; (iii) the right to continue health care benefits under COBRA, at Executive’s cost, to the extent
required and available by law; and (iv) no other severance or benefits of any kind, unless required by law or pursuant to any other written
Company plans or policies, as then in effect.

8.  Involuntary Termination Without Cause; Resignation for Good Reason.

a. Effect of Termination. The Company shall be entitled to terminate Executive with or without Cause at any time, subject to the

following:
i.

ii.

If Executive is terminated by the Company involuntarily without Cause (excluding any termination due to death
or Disability) or Executive resigns for Good Reason, then, subject to the limitations of Sections 8(b) and 23
below, Executive shall be entitled to receive: (A) Executive’s Base Salary through the effective date of the
termination or resignation; (B) continuing severance pay at a rate equal to one hundred percent (100%) of
Executive’s Base Salary, as then in effect (less applicable withholding), for a period of twelve (12) months from
the date of such termination, to be paid periodically in accordance with the Company’s normal payroll practices;
(C) reimbursement of all business expenses for which Executive is entitled to be reimbursed pursuant to Section
6 above, but for which Executive has not yet been reimbursed; (D) pro-rata portion of the Target Bonus for the
calendar year in which the termination occurs based on the period worked by Executive during such calendar
year prior to termination; (E) provided that Executive elects COBRA coverage, the Company shall reimburse
Executive for a portion of each COBRA premium payment equal to the portion the Company contributed to such
health insurance premium cost as of the date Executive’s employment terminates, until the earlier of six months
from the date of termination or the date upon which Executive becomes eligible to receive health benefits
through another employer; (F) accelerated vesting of the Option equal to the number of shares subject to the
Option that would have vested had Executive otherwise remained employed for an additional six months after
the date his employment with the Company terminated; (G) the benefit under the Change of Control Severance
Policy in the Confidential Information Agreement; and (H) no other severance or benefits of any kind, unless
required by law or pursuant to any written Company plans or policies, as then in effect.
Conditions Precedent. Any severance payments contemplated by Section 8(a)(i)(B) above are conditional on
Executive: (i) continuing to comply with the terms of this Agreement and the Confidential Information
Agreement; and (ii) signing and not revoking a separation agreement and release of known and unknown claims
in the form provided by the Company (including nondisparagement and no cooperation provisions) (the
“Release”) and provided that such Release becomes effective and irrevocable no later than sixty (60) days
following the termination date or such earlier date required by the release (such deadline, the “Release
Deadline”). If the Release does not become effective by the Release Deadline, Executive will forfeit any rights
to severance or benefits under this Section 8(a)(i)(B) or elsewhere in this Agreement. Any severance payments
or other benefits under this Agreement will be paid on, or, in the case of installments, will not commence until,
the sixtieth (60th) day following Executive’s separation from service, or, if later, such time as required by
Section 23(b). Except as required by Section 23(b), any installment payments that would have been made to
Employee during the sixty (60) day period immediately following Executive’s separation from service but for
the preceding sentence will be paid to Executive on the sixtieth (60th) day following Executive’s separation from
service and the remaining payments will be made as provided in this Agreement, unless subject to the 6- month
payment delay described herein. Notwithstanding the foregoing, this Section 8(b) shall not limit Executive’s
ability to obtain expense reimbursements under Section 6 or any other compensation or benefits otherwise
required by law or in accordance with written Company plans or policies, as then in effect.

9. Definitions.

a.

Cause. For purposes of this Agreement, “Cause” shall mean: (i) Executive’s continued failure to substantially perform
the  material  duties  and  obligations  under  this  Agreement  (for  reasons  other  than  death  or  Disability),  which  failure,  if  curable  within  the
reasonable discretion of the Company, is not cured to the reasonable satisfaction of the Company within thirty (30) days after receipt of written
notice from the Company of such failure; (ii) Executive’s failure or refusal to comply with the policies, standards and regulations established by
the Company from time to time which failure, if curable in the reasonable discretion of the Company, is not cured to the reasonable satisfaction
of the Company within thirty (30) days after receipt of written notice of such failure from the Company; (iii) any act of willful misconduct, fraud,

embezzlement, misrepresentation, or other unlawful act committed by Executive that benefits Executive at the expense of the Company; (iv) the
Executive’s violation of a federal or state law or regulation applicable to the Company’s business; (v) the Executive’s violation of, or a plea of
nolo contendre or guilty to, a felony under the laws of the United States or any state; (vi) the Executive’s material breach of the terms of this
Agreement or the Confidential Information Agreement (defined below); or (vii) the Company’s severe financial distress, whereby the Company
is in the process of winding down its business and Executive’s employment is terminated in connection with such winding down; provided that
prior to such termination, a determination is made by the Company’s Board of Directors that none of the Company’s Officers (as that term is
defined  in  Section  16  of  the  Securities  Exchange  Act  of  1934)  will  receive  severance  payments  in  connection  with  the  winding  down  of  the
Company’s business.
b.

Disability.  For  purposes  of  this  Agreement,  “Disability”  means  that  Executive,  at  the  time  notice  is  given,  has  been
unable  to  substantially  perform  Executive’s  duties  under  this  Agreement  for  not  less  than  one-hundred  and  twenty  (120)  work  days  within  a
twelve  (12)  consecutive  month  period  as  a  result  of  Executive’s  incapacity  due  to  a  physical  or  mental  condition  and,  if  reasonable
accommodation is required by law, after any reasonable accommodation.

c.

Good Reason. For purposes of this Agreement, “Good Reason” means Executive’s written notice of Executive’s intent
to  resign  for  Good  Reason  with  a  reasonable  description  of  the  grounds  therefor  within  10  days  after  the  occurrence  of  one  or  more  of  the
following  without  Executive’s  consent,  and  subsequent  resignation  within  30  days  following  the  expiration  of  any  Company  cure  period
(discussed  below):  (i)  a  material  reduction  of  Executive’s  duties,  position  or  responsibilities  (provided,  however,  that  any  change  in  duties,
position, or responsibilities due to the Company becoming a subsidiary or division of another entity in connection with a Change of Control shall
not be Good Reason); (ii) a material reduction in Executive’s Base Salary or Target Bonus (with materiality being defined for purposes of this
subsection as five percent (5%) or more of the Base Salary or Target Bonus); (iii) a material breach of this Agreement by the Company; or (iv)
any directive given to Executive by the Company that the Company knows is in violation of a law, regulation, or material Company policy and
the Company requires Executive to implement as a condition of his continued employment. Executive will not resign for Good Reason without
first providing the Company with written notice of the acts or omissions constituting the grounds for “Good Reason” within 30 days of the initial
existence of the grounds for “Good Reason” and a reasonable cure period of not less than 30 days following the date of such notice if such act or
omission is capable of cure.

10. Company Matters.

a.

Proprietary Information and Inventions. In connection with Executive’s employment with the Company, Executive will
receive and have access to Company confidential information and trade secrets. Accordingly, enclosed with this Agreement is a Confidentiality,
Non-Solicitation, Intellectual Property and Change of Control Agreement (the “Confidential Information Agreement”) which contains restrictive
covenants and prohibits unauthorized use or disclosure of the Company’s confidential information and trade secrets, among other obligations.
Executive agrees to review the Confidential Information Agreement and only sign it after careful consideration.

Resignation on Termination. On termination of Executive’s employment, regardless of the reason for such termination,
Executive shall immediately (and with contemporaneous effect) resign any directorships, offices or other positions that Executive may hold in
the Company or any affiliate, unless otherwise agreed in writing by the Parties.

b.

c.

Notification  of  New  Employer.  In  the  event  that  Executive  leaves  the  employ  of  the  Company,  Executive  grants
consent  to  notification  by  the  Company  to  Executive’s  new  employer  about  Executive’s  rights  and  obligations  under  this  Agreement  and  the
Confidential Information Agreement. Company agrees not to notify Executive’s new employer unless it has a reasonable belief that Executive
has violated or intends to violate a provision of the Confidential Information Agreement.

11.  Arbitration.  To  ensure  the  timely  and  economical  resolution  of  disputes  that  may  arise  in  connection  with  Executive’s
employment with the Company, Executive and the Company agree that any and all disputes, claims, or causes of action arising from or relating to
the  enforcement,  breach,  performance,  negotiation,  execution,  or  interpretation  of  this  Agreement,  Confidential  Information  Agreement,  or
Executive’s  employment,  or  the  termination  of  Executive’s  employment,  including  but  not  limited  to  all  statutory  claims,  will  be  resolved
pursuant to the Federal Arbitration Act, 9 U.S.C. §1-16, and to the fullest extent permitted by law, by final, binding and confidential arbitration
by  a  single  arbitrator  conducted  in  Boston,  Massachusetts  by  Judicial  Arbitration  and  Mediation  Services  Inc.  (“JAMS”)  under  the  then
applicable JAMS rules (at the following web address:); provided, however, this arbitration provision shall not apply to sexual harassment claims
to  the  extent  prohibited  by  applicable  law.  A  hard  copy  of  the  rules  will  be  provided  to  you  upon  request.  A  hard  copy  of  the  rules  will  be
provided to Executive upon request. By agreeing to this arbitration procedure, both Executive and the Company waive the right to resolve
any such dispute through a trial by jury or judge or administrative proceeding. In addition, all claims, disputes, or causes of action under
this section, whether by Executive or the Company, must be brought in an individual capacity, and shall not be brought as a plaintiff (or claimant)
or class member in any purported class or representative proceeding, nor joined or consolidated with the claims of any other person or entity. The
Arbitrator  may  not  consolidate  the  claims  of  more  than  one  person  or  entity,and  may  not  preside  over  any  form  of  representative  or  class
proceeding. To the extent that the preceding sentences regarding class claims or proceedings are found to violate applicable law or are otherwise
found unenforceable, any claim(s) alleged or brought on behalf of a class shall proceed in a court of law rather than by arbitration. The Company
acknowledges that Executive will have the right to be represented by legal counsel at

any  arbitration  proceeding.  Questions  of  whether  a  claim  is  subject  to  arbitration  under  this  Agreement)  shall  be  decided  by  the  arbitrator.
Likewise, procedural questions which grow out of the dispute and bear on the final disposition are also matters for the arbitrator. The arbitrator
shall:  (a)  have  the  authority  to  compel  adequate  discovery  for  the  resolution  of  the  dispute  and  to  award  such  relief  as  would  otherwise  be
permitted  by  law;  (b)  issue  a  written  arbitration  decision,  to  include  the  arbitrator’s  essential  findings  and  conclusions  and  a  statement  of  the
award; and (c) be authorized to award any or all remedies that Executive or the Company would be entitled to seek in a court of law. Executive
and the Company shall equally share all JAMS’ arbitration fees. Except as modified in the Confidential Information Agreement, each party is
responsible  for  its  own  attorneys’  fees.  Nothing  in  this  Agreement  is  intended  to  prevent  either  Executive  or  the  Company  from  obtaining
injunctive relief in court to prevent irreparable harm pending the conclusion of any such arbitration. Any awards or orders in such arbitrations
may be entered and enforced as judgments in the federal and state courts of any competent jurisdiction. To the extent applicable law prohibits
mandatory arbitration of sexual harassment claims, in the event you intend to bring multiple claims, including a sexual harassment claim, the
sexual harassment may be publicly filed with a court, while any other claims will remain subject to mandatory arbitration.

12. Assignment. This Agreement will be binding upon and inure to the benefit of (a) the heirs, executors and legal representatives of
Executive upon Executive's death and (b) any successor of the Company. Any such successor of the Company will be deemed substituted for the
Company under the terms of this Agreement for all purposes. For this purpose, “successor” means any person, firm, corporation or other business
entity which at any time, whether by purchase, merger or otherwise, directly or indirectly acquires all or substantially all of the assets or business
of the Company. None of the rights of Executive to receive any form of compensation payable pursuant to this Agreement may be assigned or
transferred except by will or the laws of descent and distribution. Any other attempted assignment, transfer, conveyance or other disposition of
Executive’s right to compensation or other benefits will be null and void.

13. Notices. All notices, requests, demands and other communications called for under this Agreement shall be in writing and shall
be delivered via e-mail, personally by hand or by courier, mailed by United States first-class mail, postage prepaid, or sent by facsimile directed
to the Party to be notified at the address or facsimile number indicated for such Party on the signature page to this Agreement, or at such other
address or facsimile number as such Party may designate by ten (10) days’ advance written notice to the other Parties hereto. All such notices and
other communications shall be deemed given upon personal delivery, three (3) days after the date of mailing, or upon confirmation of facsimile
transfer or e-mail. Notices sent via e-mail under this Section shall be sent to either the e-mail address in this Agreement, or for e-mails sent by the
Company to Executive, to the last e-mail address on file with the Company.

14.  Severability.  In  the  event  that  any  provision  hereof  becomes  or  is  declared  by  a  court  of  competent  jurisdiction  to  be  illegal,

unenforceable or void, this Agreement will continue in full force and effect without said provision.

15.  Integration.  This  Agreement,  together  with  the  Plan  and  related  agreements,  and  the  Confidential  Information  Agreement
represents the entire agreement and understanding between the parties as to the subject matter herein and supersedes all prior or contemporaneous
agreements whether written or oral. No waiver, alteration, or modification of any of the provisions of this Agreement will be binding unless in
writing and signed by duly authorized representatives of the parties hereto.

16. Tax Withholding. All payments made pursuant to this Agreement will be subject to withholding of applicable taxes.
17. Waiver. No Party shall be deemed to have waived any right, power or privilege under this Agreement or any provisions hereof
unless such waiver shall have been duly executed in writing and acknowledged by the Party to be charged with such waiver. The failure of any
Party  at  any  time  to  insist  on  performance  of  any  of  the  provisions  of  this  Agreement  shall  in  no  way  be  construed  to  be  a  waiver  of  such
provisions, nor in any way to affect the validity of this Agreement or any part hereof. No waiver of any breach of this Agreement shall be held to
be a waiver of any other subsequent breach

18. Governing Law. This Agreement will be governed by the laws of the Commonwealth of Massachusetts (with the exception of its

conflict of laws provisions).

19. Acknowledgment. Executive acknowledges that Executive has had the opportunity to discuss this matter with and obtain advice
from Executive’s legal counsel, has had sufficient time to, and has carefully read and fully understands all the provisions of this Agreement, and
is knowingly and voluntarily entering into this Agreement.

20. Counterparts. This Agreement may be executed in multiple counterparts, each of which shall be deemed to be an original, and all

such counterparts shall constitute but one instrument.

21.  Effect  of  Headings.  The  section  and  subsection  headings  contained  herein  are  for  convenience  only  and  shall  not  affect  the

construction hereof.

22.  Construction  of  Agreement.  This  Agreement  has  been  negotiated  by  the  respective  Parties,  and  the  language  shall  not  be

construed for or against either Party.

23. Section 409A.

Notwithstanding  anything  to  the  contrary  in  this  Agreement,  no  severance  pay  or  benefits  to  be  paid  or  provided  to
Executive,  if  any,  pursuant  to  this  Agreement,  when  considered  together  with  any  other  severance  payments  or  separation  benefits  that  are
considered deferred compensation under Section 409A (together, the “Deferred Compensation

a.

Separation Benefits”) will be paid or otherwise provided until Executive has a “separation from service” within the meaning of Section 409A.

b.

Notwithstanding anything to the contrary in this Agreement, if Executive is a “specified employee” within the meaning
of Section 409A at the time of Executive’s termination (other than due to death), then the Deferred Compensation Separation Benefits that are
payable within the first six (6) months following Executive’s separation from service, will become payable on the first payroll date that occurs on
or after the date six (6) months and one (1) day following the date of Executive’s separation from service. All subsequent Deferred Compensation
Separation  Benefits,  if  any,  will  be  payable  in  accordance  with  the  payment  schedule  applicable  to  each  payment  or  benefit.  Notwithstanding
anything herein to the contrary, if Executive dies following Executive’s separation from service, but prior to the six (6) month anniversary of the
separation from service, then any payments delayed in accordance with this paragraph will be payable in a lump sum as soon as administratively
practicable after the date of Executive’s death and all other Deferred Compensation Separation Benefits will be payable in accordance with the
payment  schedule  applicable  to  each  payment  or  benefit.  Each  payment  and  benefit  payable  under  this  Agreement  is  intended  to  constitute
separate payments for purposes of Section 1.409A-2(b)(2) of the Treasury Regulations.

Any  amount  paid  under  this  Agreement  that  satisfies  the  requirements  of  the  “short-term  deferral”  rule  set  forth  in
Section  1.409A-1(b)(4)  of  the  Treasury  Regulations  will  not  constitute  Deferred  Compensation  Separation  Benefits  for  purposes  of  clause  (a)
above.

c.

d.

Any amount paid under this Agreement that qualifies as a payment made as a result of an involuntary separation from
service  pursuant  to  Section  1.409A-1(b)(9)(iii)  of  the  Treasury  Regulations  that  does  not  exceed  the  Section  409A  Limit  will  not  constitute
Deferred Compensation Separation Benefits for purposes of clause (a) above. For purposes of this Agreement, “Section 409A Limit” will mean
the lesser of two (2) times: (i) Executive’s annualized compensation based upon the annual rate of pay paid to Executive during the Executive’s
taxable  year  preceding  Executive’s  taxable  year  of  Executive’s  termination  of  employment  as  determined  under  Treasury  Regulation  Section
1.409A-1(b)(9)(iii)(A)(1) and any Internal Revenue Service guidance issued with respect thereto; or (ii) the maximum amount that may be taken
into account under a qualified plan pursuant to Section 401(a)(17) of the Internal Revenue Code for the year in which Executive’s employment is
terminated.

e.

The foregoing provisions are intended to comply with the requirements of Section 409A so that none of the severance
payments and benefits to be provided hereunder will be subject to the additional tax imposed under Section 409A, and any ambiguities herein
will be interpreted to so comply. The Company and Executive agree to work together in good faith to consider amendments to this Agreement
and to take such reasonable actions which are necessary, appropriate or desirable to avoid imposition of any additional tax or income recognition
prior to actual payment to Executive under Section 409A.

“COMPANY”

X4 PHARMACEUTICALS, INC.
By: /s/ Paula M. Ragan
Address:
X4 Pharmaceuticals, Inc
955 Massachusetts Avenue, 4th Floor
Cambridge, MA 02139
Attn: Ronny Mosston
Email: Ronny.Mosston@x4pharma.com

“EXECUTIVE”

DEREK M. MEISNER
/s/ Derek Meisner

Executive Name

Address:
11 Thornton Rd.
Needham, MA 02492

Enclosure
Confidentiality, Non-Solicitation, Intellectual Property and Change of Control Agreement

AMENDMENT TO MEISNER EMPLOYMENT AGREEMENTS

Exhibit 10.23

This  amendment  (this  “Amendment”)  to  that  certain  Executive  Employment  Agreement,  dated  September  25,  2019  (the  “Employment
Agreement”) by and between Derek M. Meisner (“Employee”) and X4 Pharmaceuticals, Inc. (the “Company”), and the Confidentiality,
Non-Solicitation,  Intellectual  Property  and  Change  of  Control  Agreement  (the  “CNIPCA),  dated  September  29,  2019,  by  and  between
Employee and the Company, is entered into as of this 24th day of February, 2020.

WHEREAS, on February 10, 2020, the Compensation Committee of the Board of Directors of the Company (the “Board”) voted to adjust
certain aspects of Employee’s compensation terms; and

WHEREAS, the parties wish to amend the Employment Agreement and the CNIPCA to reflect the Board’s decision.

In consideration and in furtherance of Employee’s continued at-will employment with the Company, Employee and the Company agree as
follows:
1.

Section 8 of the CNIPCA shall be entirely replaced by the following replacement language:
Replacement language: “[Reserved]”

2. The below existing language in the Agreement shall be entirely replaced by the replacement language beneath it:

Existing language: “8. Involuntary Termination Without Cause; Resignation for Good Reason. (a)Effect of Termination. The
Company shall be entitled to terminate Executive with or

without Cause at any time, subject to the following:

(i) If Executive is terminated by the Company involuntarily without Cause (excluding any termination due to death or Disability) or
Executive  resigns  for  Good  Reason,  then,  subject  to  the  limitations  of  Sections  8(b)  and  23  below,  Executive  shall  be  entitled  to
receive: (A) Executive’s Base Salary through the effective date of the termination or resignation; (B) continuing severance pay at a
rate equal to one hundred percent (100%) of Executive’s Base Salary, as then in effect (less applicable withholding), for a period of
twelve  (12)  months  from  the  date  of  such  termination,  to be  paid  periodically  in  accordance  with  the  Company’s  normal  payroll
practices; (C) reimbursement of all business expenses for which Executive is entitled to be reimbursed pursuant to Section 6 above,
but for which Executive has not yet been reimbursed; (D) pro-rata portion of the Target Bonus for the calendar year in which the
termination  occurs  based  on  the  period  worked  by  Executive  during  such  calendar  year  prior  to  termination;  (E)  provided  that
Executive elects COBRA coverage, the Company shall reimburse Executive for a portion of each COBRA premium payment equal
to the portion the Company contributed to such health insurance premium cost as of the date Executive’s employment terminates,
until  the  earlier  of  six  months  from  the  date  of  termination  or  the  date  upon which  Executive  becomes  eligible  to  receive  health
benefits through another employer; (F) accelerated  vesting  of  the  Option  equal  to  the  number  of  shares  subject  to  the  Option  that
would have vested had Executive otherwise remained employed for an additional six months after the date his employment with the
Company terminated; (G) the benefit under the Change of Control Severance Policy in the Confidential Information Agreement; and
(H) no other severance or benefits of any kind, unless required by law or pursuant to any written Company plans or policies, as then
in effect.”

Replacement language: “8. Involuntary Termination Without Cause; Resignation for Good Reason.

a. Effect of Termination. The Company shall be entitled to terminate Executive with or without Cause and Executive may resign for

Good Reason, subject to the following:

(i)  If  Executive  is  terminated  by  the  Company  involuntarily  without  Cause  (excluding  any  termination  due  to  death  or
Disability)  or  Executive  resigns  for  Good  Reason  at  any  time  except  as  provided  in  Section  8(a)(ii),  then,  subject  to  the
limitations of Sections 8(b) and 23 below, Executive shall be entitled to receive: (A) Executive’s  Base  Salary  through  the
effective date of the termination or resignation; (B) continuing severance pay at a rate equal to one hundred percent (100%)
of Executive’s Base Salary, as then in effect (less applicable withholding), for a period of twelve (12) months from the date
of such termination, to be paid periodically in accordance with the Company’s normal payroll practices; (C) reimbursement
of  all  business  expenses  for  which  Executive  is  entitled  to  be  reimbursed  pursuant  to  Section  6  above,  but  for  which
Executive  has  not  yet  been  reimbursed;  (D)  pro-rata  portion  of  the  Target  Bonus  for  the  calendar  year  in  which  the
termination  occurs  based  on  the  period  worked  by  Executive  during  such  calendar  year  prior  to  termination;  (E)  provided
that  Executive  elects  COBRA  coverage,  the  Company  shall  reimburse  Executive  for  a  portion  of each  COBRA  premium
payment equal to the portion the Company contributed  to  such  health  insurance  premium  cost  as  of  the  date  Executive’s
employment  terminates,  until  the  earlier  of  six  months  from  the  date  of  termination  or  the  date  upon  which  Executive
becomes  eligible  to  receive  health  benefits  through  another  employer;  (F)  accelerated  vesting  of  the  Option  equal  to  the
number of shares subject to the Option that would have vested had Executive otherwise remained employed for an additional
six months after the date his employment with the Company terminated; and (G) no other severance or benefits of any kind,
unless required by law or pursuant to any written Company plans or policies, as then in effect.

(ii)  If,  within  twelve  (12)  months  after  a  Change  of  Control  as  defined  below,  Executive  is  terminated  by  the  Company
involuntarily without Cause (excluding any termination due to death or Disability) or Executive resigns for Good Reason,
then, subject to the limitations of Sections 8(b) and 23 below, Executive shall be entitled to receive, in lieu of the benefits set
forth  in  Section  8(a)(i):  (A)  Executive’s  Base  Salary  through  the  effective  date  of  the  termination  or  resignation;  (B)
continuing severance pay at a rate equal to one hundred percent (100%) of Executive’s Base Salary, as then in effect (less
applicable  withholding),  for  a  period  of  twelve  (12)  months  from  the  date  of  such  termination,  to  be  paid  periodically  in
accordance with the Company’s normal payroll practices; (C) reimbursement of all business expenses for which Executive is
entitled to be reimbursed pursuant to Section 6 above, but for which Executive has not yet been reimbursed; (D) an amount
equal to Executive’s full Target Bonus for the calendar year in which the termination occurs in advance of such Target Bonus
being earned; (E) provided that Executive elects COBRA coverage, the Company shall reimburse Executive for a portion of
each COBRA premium payment equal to the portion the Company contributed to such health insurance premium cost as of
the  date  Executive’s  employment  terminates,  until  the  earlier  of  six  months  from  the  date  of  termination  or  the  date  upon
which Executive becomes eligible to receive health benefits through another employer; (F) the full acceleration of vesting of
the Option as of

the date his employment with the Company terminated; and (G) no other severance or benefits of any kind, unless required
by law or pursuant to any written Company plans or policies, as then in effect. For purposes of this Agreement, a “Change
of Control” is defined as a Reorganization Event, as defined in the X4 Pharmaceuticals, Inc. 2017 Equity Incentive Plan, as it
may be further amended from time to time, or any successor plan thereto.

3. The below existing language in Section 8(b) of the Agreement shall be entirely replaced by the replacement language beneath it:

Existing  Language:  “(b)  Conditions  Precedent.  Any  severance  payments  contemplated  by  Section  8(a)(i)(B)  above  are  conditional  on
Executive: (i) continuing to comply with the terms of this Agreement and the Confidential Information Agreement; and (ii) signing and not
revoking  a  separation  agreement  and  release  of  known  and  unknown  claims  in  the  form  provided  by  the  Company  (including
nondisparagement and no cooperation provisions) (the “Release”) and provided that such Release becomes effective and irrevocable no later
than sixty (60) days following the termination date or such earlier date required by the release (such deadline, the “Release Deadline”). If the
Release does not become effective by the Release Deadline, Executive will forfeit any rights to severance or benefits under this Section 8(a)
(i)(B) or elsewhere in this Agreement. Any severance payments or other benefits under this Agreement will be paid on, or, in the case of
installments, will not commence until, the sixtieth (60th) day following Executive’s separation from service, or, if later, such time as required
by Section 23(b). Except as required by Section 23(b), any installment payments that would have been made to Employee during the sixty
(60) day period immediately following Executive’s separation from service but for the preceding sentence will be paid to Executive on the
sixtieth (60th) day following Executive’s separation from service and the remaining payments will be made as provided in this Agreement,
unless subject to the 6- month payment delay described herein. Notwithstanding the foregoing, this Section 8(b) shall not limit Executive’s
ability to obtain expense reimbursements under Section 6 or any other compensation or benefits otherwise required by law or in accordance
with written Company plans or policies, as then in effect.”

Replacement Language: “(b) Conditions Precedent. Any severance payments contemplated by Section 8(a)(i)(B) or 8(a)(ii)(B) above are
conditional on Executive: (i) continuing to comply with the terms of this Agreement and the Confidential Information Agreement; and (ii)
signing and not revoking a separation agreement and release of known and unknown claims in the form provided by the Company (including
nondisparagement and no cooperation provisions) (the “Release”) and provided that such Release becomes effective and irrevocable no later
than sixty (60) days following the termination date or such earlier date required by the release (such deadline, the “Release Deadline”). If the
Release does not become effective by the Release Deadline, Executive will forfeit any rights to severance or benefits under Sections 8(a)(i)
(B) or 8(a)(ii)(B) or elsewhere in this Agreement. Any severance payments or other benefits under this Agreement will be paid on, or, in the
case of installments, will not commence until, the sixtieth (60th) day following Executive’s separation from service, or, if later, such time as
required by Section 23(b). Except as required by Section 23(b), any installment payments that would have been made to Employee during the
sixty (60) day period immediately following Executive’s separation from service but for the preceding sentence will be paid to Executive on
the  sixtieth  (60th)  day  following  Executive’s  separation  from  service  and  the  remaining  payments  will  be  made  as  provided  in  this
Agreement, unless subject to the 6- month payment delay described herein. Notwithstanding the foregoing, this Section 8(b) shall not limit
Executive’s ability to obtain expense reimbursements under Section 6 or any other compensation or benefits otherwise required by law or in
accordance with written Company plans or policies, as then in effect.”

4. The below existing language in Section 9(c) of the Agreement shall be entirely replaced by the replacement language beneath it:

Existing language: “Good Reason. For purposes of this Agreement, “Good Reason” means Executive’s written notice of Executive’s intent
to resign for Good Reason with a reasonable description of the grounds therefor within 10 days after the occurrence of one or more of the
following  without  Executive’s  consent,  and  subsequent  resignation  within  30  days  following  the  expiration  of  any  Company  cure  period
(discussed below): (i) a material reduction of Executive’s duties, position or responsibilities (provided, however, that any change in duties,
position, or responsibilities due to the Company becoming a subsidiary or division of another entity in connection with a Change of Control
shall not be Good Reason); (ii) a material reduction in Executive’s Base Salary or Target Bonus (with materiality being defined for purposes
of  this  subsection  as  five  percent  (5%)  or  more  of  the  Base  Salary  or  Target  Bonus);  (iii)  a  material  breach  of  this  Agreement  by  the
Company; or (iv) any directive given to Executive by the Company that the Company knows is in violation of a law, regulation, or material
Company policy and the Company requires Executive to implement as a condition of his continued employment. Executive will not resign
for  Good  Reason  without  first  providing  the  Company  with  written  notice  of  the  acts  or  omissions  constituting  the  grounds  for  “Good
Reason”  within  30  days  of  the  initial  existence  of  the  grounds  for  “Good  Reason”  and  a  reasonable  cure  period of not less  than  30  days
following the date of such notice if such act or omission is capable of cure.”

Replacement language:  “Good  Reason.  For  the  purposes  of  this  Agreement,  “Good  Reason”  for  resignation  from  employment  with  the
Company  means  that  any  of  the  following  actions  are  taken  by  the  Company  without  Executive’s  prior  written  consent:  (A)  a  material
reduction in Executive’s base salary, which the parties agree is a reduction of at least 10% of Executive’s base salary (unless pursuant to a
salary  reduction  program  applicable  generally  to  the  Company’s  similarly  situated  employees);  or  (B)  a  material  reduction  in  Executive’s
duties, position or responsibilities; or (C) relocation of Executive’s principal place of employment to a place that increases Executive’s one-
way commute by more than sixty (60) miles as compared to Executive’s then-current principal place of employment immediately prior to
such relocation. In order to resign for Good Reason, Executive must provide written notice to the Company’s CEO within 30 days after the
first occurrence of the event giving rise to Good Reason setting forth the basis for Executive’s resignation, allow the Company at least 30
days from receipt of such written notice to cure such event, and if such event is not reasonably cured within such period, Executive must
resign from all positions Executive then holds with the Company not later than 90 days after the expiration of the cure period.”

5. The below existing language in Section 9(c) of the Agreement shall be entirely replaced by the replacement language beneath it:

For avoidance of doubt, this Amendment shall supersede and replace any severance provisions set forth in the Employment Agreement, as
amended herein.

This  Amendment  may  be  executed  in  several  counterparts,  all  of  which  taken  together  shall  constitute  one  single agreement  between  the
parties. Except as amended hereby, all of the terms and conditions of the Agreement shall remain and continue in full force and effect.

IN WITNESS WHEREOF, the parties have executed this Amendment as of the date first written above.

X4 Pharmaceuticals, Inc.
By: /s/ Paula Ragan

Name: Paula Ragan
Title: Chief Executive Officer

Derek M. Meisner, an individual
By: /s/ Derek Meisner

  Derek M. Meisner

Exhibit 10.32

61 NORTH BEACON STREET
ALLSTON, MASSACHUSETTS

I N D E X T O L E A S E

FROM

BEACON NORTH VILLAGE, LLC

TO

X4 PHARMACEUTICALS, INC.

61 North Beacon Street, Allston, MA – X4 Pharmaceuticals

TABLE OF CONTENTS

ARTICLE I Basic Lease Provisions and Enumerations of Exhibits

1.1 Introduction

1.2 Basic Data

1.3 Enumeration of Exhibits

ARTICLE II Premises

2.1 Demise and Lease of Premises

2.2 Appurtenant Rights and Reservations

ARTICLE III Lease Term and Extension Options

3.1 Term

3.2 Extension Option

ARTICLE IV Condition of Premises; Alterations

4.1 Preparation of Premises

ARTICLE V Annual Fixed Rent

5.1 Fixed Rent

5.2 Additional Rent

ARTICLE VI Taxes

6.1 Definitions

6.2 Tenant’s Share of Real Estate Taxes

ARTICLE VII Landlord’s Repairs and Services and Tenant’s Escalation Payments

        Structural Repairs

7.2 Other Repairs to be Made by Landlord

7.3 Services to be Provided by Landlord

7.4 Operating Costs Defined

7.5 Tenant’s Operating Expense Payments

7.6 Tenant’s Audit Right

7.7 No Damage

ARTICLE VIII Tenant’s Repairs

8.1 Tenant’s Repairs and Maintenance

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ARTICLE IX Alterations

9.1 Landlord’s Approval

9.2 Conformity of Work

9.3 Performance of Work, Governmental Permits and Insurance

9.4 Liens

9.5 Nature of Alterations

9.6 Increases in Taxes

9.7 Alterations Permitted Without Landlord’s Consent

ARTICLE X Parking

10.1 Parking Privileges

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61 North Beacon Street, Allston, MA – X4 Pharmaceuticals

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10.2 Parking Operations

10.3 Limitations

ARTICLE XI Certain Tenant Covenants

ARTICLE XII Assignment and Subletting

12.1 Restrictions on Transfer

12.2 Tenant’s Notice

12.3 Landlord’s Termination Right

12.4 Consent of Landlord

12.5 Exceptions

12.6 Profit on Subleasing or Assignment

12.7 Additional Conditions

ARTICLE XIII Indemnity and Insurance

13.1 Tenant’s Indemnity

13.2 Tenant’s Risk

13.3 Tenant’s Commercial General Liability Insurance

13.4 Tenant’s Property Insurance

13.5 Tenant’s Other Insurance

13.6 Requirements for Tenant’s Insurance

13.7 Additional Insureds

13.8 Certificates of Insurance

13.9 Subtenants and Other Occupants

13.10 No Violation of Building Policies

13.11 Tenant to Pay Premium Increases

13.12 Landlord’s Insurance

13.13 Waiver of Subrogation

13.14 Tenant’s Work

ARTICLE XIV Fire, Casualty and Taking

14.1 Damage Resulting from Casualty

14.2 Uninsured Casualty

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14.3 Rights of Termination for Taking

14.4 Award

ARTICLE XV Default

15.1 Tenant’s Default

15.2 Termination; Re(cid:0)Entry

15.3 Continued Liability; Re-Letting

15.4 Liquidated Damages

15.5 Waiver of Redemption

15.6 Landlord’s Default

ARTICLE XVI Miscellaneous Provisions

16.1 Waiver

16.2 Cumulative Remedies

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61 North Beacon Street, Allston, MA – X4 Pharmaceuticals

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16.3 Quiet Enjoyment

16.4 Surrender

16.5 Brokerage

16.6 Invalidity of Particular Provisions

16.7 Provisions Binding, Etc.

16.8 Recording; Confidentiality

16.9 Notices and Time for Action

16.10 When Lease Becomes Binding and Authority

16.11 Paragraph Headings

16.12 Rights of Mortgagee

16.13 Rights of Ground Lessor

16.14 Notice to Mortgagee and Ground Lessor

16.15 Assignment of Rents

16.16 Status Report and Financial Statements

16.17 Self(cid:0)Help

16.18 Holding Over

16.19 Entry by Landlord

16.20 Tenant’s Payments

16.21 Late Payment

16.22 Counterparts

16.23 Entire Agreement

16.24 Landlord Liability

16.25 No Partnership

16.26 Letter of Credit

16.27 Electronic Signatures

16.28 Reserved

16.29 Governing Law

16.30 Payment of Litigation Expenses

16.31 Waiver of Trial by Jury

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ARTICLE XVII Tenant Signage

17.1 Definitions.

17.2 Signage.

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61 North Beacon Street, Allston, MA – X4 Pharmaceuticals

61 NORTH BEACON STREET
ALLSTON, MASSACHUSETTS

THIS  INSTRUMENT  IS  AN  INDENTURE  OF  LEASE  in  which  the  Landlord  and  the  Tenant  are  the  parties

hereinafter named, and which relates to space in the building known as 61 North Beacon Street, Allston, Massachusetts.

The parties to this instrument hereby agree with each other as follows:

ARTICLE I.

Basic Lease Provisions and Enumerations of Exhibits

1 Introduction

The following sets forth the basic data and identifying Exhibits elsewhere hereinafter referred to in this Lease, and, where
appropriate, constitute definitions of the terms hereinafter listed.

2 Basic Data

Execution Date:
Landlord:
Present Mailing Address of Landlord:
Landlord’s Construction Representative:
Tenant:
Present Mailing Address of Tenant:
Term or Lease Term: (sometimes called the “Original
Lease Term”)

Extension Option:

Lease Year:

November , 2019
Beacon North Village, LLC
61 North Beacon Street, Boston, MA 02134
Kerin Shea, kshea@ciccologroup.com
X4 Pharmaceuticals, Inc., a Massachusetts corporation
955 Massachusetts Avenue, 4th Floor Cambridge, MA 02139
The  period  commencing  on  the  Commencement  Date  and
ending  on  the  last  day  of  the  seventh  (7th)  Lease  Year
(“Expiration  Date”),  unless  extended  or  sooner  terminated
as provided in this Lease.

One period of five (5) years as provided in and on the terms
set forth in Section 3.2 hereof.
For  purposes  hereof,  “Lease  Year”  shall  mean  each
consecutive  twelve  (12)  month  period  beginning  on  the
the
Commencement  Date 
Commencement  Date,  provided,  however, 
the
Commencement  Date  does  not  fall  on  the  first  day  of  a
calendar  month,  then  the  first  Lease  Year  shall  begin  on  the
Commencement  Date  and  end  on  the  last  day  of  the  month
containing the first anniversary of the Commencement Date,
and  each  succeeding  Lease  Year  shall  begin  on  the  day
following the expiration of the prior Lease Year.

anniversary 

of 
if 

that 

an 

or 

Commencement Date:
Premises:

Rentable Floor Area of the Premises:

Annual Fixed Rent:

Simultaneous with the Execution Date.
The  entire  third  (3rd)  and  fourth  (4th)  floors  containing
approximately  28,000  square  feet  of  Rentable  Floor  Area  in
the aggregate, all as shown on the floor plans annexed hereto
as Exhibit D and incorporated herein by reference.

Determined to be Twenty Eight Thousand (28,000) square
feet
During  the  Original  Lease  Term  at  the  following  annual
amounts:

(i)During 

the  period 

the  Rent
Commencement  Date  and  continuing 
the
expiration of the first (1st) Lease Year, the annual amount

commencing  on 

through 

Additional Rent:

Total Rentable Floor Area of the Building:
Building:

Permitted Use:

Letter of Credit:

Brokers:
Historic Tax Credits:

of $980,000.00 (being equal to the product of (x) $35.00
and (y) the Rentable Floor Area of the Premises);

(ii)For each subsequent Lease Year during the Original Lease
Term, the Annual Fixed Rent shall increase by $1.00 per
square foot of Rental Floor Area of the Premises).

All charges and other sums payable by Tenant as set forth in
this Lease, in addition to Annual Fixed Rent.
71,000 square feet.
The Building located on the land known as and numbered 61
North Beacon Street, Allston, Massachusetts, as the same
may be altered, expanded, reduced or otherwise changed by
Landlord from time to time.
Executive,  professional  and  administrative  offices  and  all
lawful uses ancillary thereto, in all events as may from time
to time be permitted under the Zoning By(cid:0)Law of the City of
Allston and consistent with the types of uses generally found
in  first(cid:0)class  office  buildings  in  the  Allston/Brighton  and
Brighton Landing area (the “Market Area”).

One  Million  One  Hundred  Forty  Thousand  Three  Hundred
Seventy  Eight  Dollars  and  Sixty  Cents  ($1,140,378.60),
payable  in  accordance  with  and  to  be  held  and  released
subject to the provisions of Section 16.26.

CBRE, Inc.
The historic rehabilitation tax credit allowed for qualified
rehabilitation expenditures incurred in connection with the
“certified rehabilitation” of a “certified historic structure”
pursuant to Section 47 of the Internal Revenue Code of 1986,
as amended from time to time, or any corresponding
provision or provisions of prior or succeeding law.

1.3 Enumeration of Exhibits

The following Exhibits attached hereto are a part of this Lease, are incorporated herein by reference, and are to be treated
as a part of this Lease for all purposes. Undertakings contained in such Exhibits are agreements on the part of Landlord
and Tenant, as the case may be, to perform the obligations stated therein to be performed by Landlord and Tenant, as and
where stipulated therein.

Exhibit A --  Legal Description

Exhibit B-1 -- Work Agreement

Exhibit B-2 -- Tenant Plan and Working Drawing Requirements

Exhibit B-3 -- Tenant’s Fit Plan

Exhibit B-4 -- Roof Area

Exhibit C -- Landlord’s Services

Exhibit D -- Floor Plans of the Premises

Exhibit E -- ACH Directive

Exhibit F -- Omitted

Exhibit G -- Forms of Lien Waivers

Exhibit H -- Broker Determination of Prevailing Market Rent

Exhibit I -- List of Mortgages

Exhibit J -- Form of Letter of Credit

Exhibit K -- Form of Notice of Lease

Exhibit L -- Form of SNDA

Exhibit M -- Controllable Expenses

2.1 Demise and Lease of Premises

ARTICLE II.

Premises

        
Landlord hereby demises and leases to Tenant, and Tenant hereby hires and accepts from Landlord, the Premises in the
Building, excluding exterior faces of exterior walls, the common stairways and stairwells, elevators and elevator walls,
mechanical rooms, electric and telephone closets, janitor closets, and pipes, ducts, shafts, conduits, wires and appurtenant
fixtures serving exclusively or in common other parts of the Building, and if the Premises includes less than the entire
rentable area of any floor, excluding the common corridors, elevator lobbies and toilets located on such floor. Tenant shall
have the nonexclusive right to use the loading areas, fan rooms, janitorial, electrical, telephone and telecommunications
closets, conduits, risers, shafts, plenum spaces and elevators serving such Building, subject, however, to the extent Tenant
is given prior written notice thereof, to Landlord’s reasonable rules and regulations relative to the access to and use of
such spaces.

2.2 Appurtenant Rights and Reservations

(A) Subject to Landlord’s right to change or alter any of the following in Landlord’s discretion as herein provided, Tenant
shall have, as appurtenant to the Premises the non-exclusive right to use and to permit Tenant’s invitees (as appropriate,
given the nature of their business at the Premises) to use from time to time in common with others, but not in a manner or
extent that would materially interfere with the normal operation and use of the Building as a multi-tenant office building
and subject to reasonable rules of general applicability to tenants of the Building from time to time made by Landlord of
which Tenant is given notice (the “Rules and Regulations”): (a) the common lobbies, corridors, stairways, and elevators
of the Building, and the pipes, ducts, shafts, conduits, wires and appurtenant meters and equipment serving the Premises
in common with others, (b) the loading areas serving the Building and the common walkways and driveways necessary
for access to the Building, and (c) if the Premises include less than the entire rentable floor area of any floor, the common
toilets, corridors and elevator lobby of such floor (collectively, the “Common Areas”); and no other appurtenant rights
and easements. Landlord may modify,  amend,  supplement  or  change  the  Rules  and  Regulation from time to time upon
reasonable prior notice (except in the event of an emergency) to Tenant and provided that, except if required in connection
with applicable Legal Requirements, in no event shall any new Rules and Regulations be inconsistent with Tenant’s rights
under  this  Lease  or  increase  Tenant’s  obligations  (other  than  to  a  de  minimis  extent)  or  liabilities  under  this  Lease.
Landlord agrees that the Rules and Regulations will not be modified in a discriminatory manner with respect to Tenant or
any other occupant of the Building, will be enforced in a uniform and non-discriminatory manner and in the event of a
conflict between this Lease and the Rules and Regulations, the provisions of this Lease shall control.

(B) Tenant shall be permitted reasonable access to and use of the risers, conduits and shafts in the Building (not to exceed
Tenant’s proportionate share of available space that is not being used for operation of the Building) required for Tenant to
run electrical and telecommunications conduits or cable for the Premises.

Notwithstanding anything to the contrary herein, Landlord has no obligation to allow any particular telecommunication
service provider to have access to the Building or to the Premises except as may be required by all applicable compliance
with  all  applicable  laws,  ordinances,  rules,  regulations,  statutes,  by-laws,  court  decisions,  matters  and  restrictions  of
record  (including,  without  limitation,  preservation  restrictions  that  may  be  recorded  after  the  date  of  this  Lease)  and
orders and requirements of all public authorities (collectively, the “Legal Requirements”) and except that Landlord will
not unreasonably withhold, condition or delay its approval of any telecommunications provider designated by Tenant to
service the Premises.

(C)  Landlord  reserves  for  its  benefit  the  right  from  time  to  time,  without  unreasonable  interference  with  Tenant’s  use  and
upon reasonable prior notice to Tenant (except in the event of an emergency): (a) to install, use, maintain, repair, replace
and  relocate  for  service  to  the  Premises  and  other  parts  of  the  Building,  or  either,  pipes,  ducts,  conduits,  wires  and
appurtenant fixtures, wherever located in the Premises or the Building, (b) to maintain, use, operate, lease and repair the
existing solar array on the roof of the Building, as the same may be modified in Landlord’s sole discretion, and (c) to alter
or  relocate  any  other  common  facility,  provided  that  substitutions  are  substantially  equivalent  or  better.  Installations,
replacements and relocations referred to in clause (a) above shall be located so far as practicable in the central core area of
the Building, above ceiling surfaces, below floor surfaces or within perimeter walls of the Premises, provided that, except
to  the  extent  required  by  Legal  Requirements,  (i)  such  items  do  not  adversely  affect  the  first  class  appearance  or
usefulness  of  the  Premises,  (ii)  no  such  work  shall  result  in  material  changes  in  entrance  doors  to  the  Premises  or
corridors on multi-tenant floors on which any portion of the Premises is located without Tenant’s express consent, and
(iii) no such work shall reduce the usable area of the Premises (other than to a de minimis extent) or increase Tenant’s
obligations  (other  than  to  a  de  minimis  extent)  or  liabilities  under  this  Lease.  Except in the case of emergencies or for
normal  cleaning  and  maintenance  operations,  Landlord  agrees,  with  respect  to  any  of  the  foregoing  activities  which
require work in or access to the Premises, to use all reasonable efforts to give Tenant reasonable advance notice of such
work  and  to  perform  the  same  at  such  times  and  in  such  manner,  after  consultation  with  Tenant,  as  to  minimize
interference with Tenant’s use of the Premises.

(D) Landlord reserves and excepts for its benefit all rights of ownership and use in all respects outside the Premises, including
without limitation, the Building and all other structures and improvements and plazas and Common Areas, except that at
all times during the term of this Lease Tenant shall have a reasonable means of access from a public street to the Premises.
Without limitation of the foregoing reservation of rights by Landlord, it is understood that in its sole discretion Landlord
shall  have  the  right  to  change  and  rearrange  the  Common  Areas,  to  change,  relocate  and  eliminate  facilities  therein,  to
erect new buildings thereon, to permit the use of or lease all or part thereof for exhibitions and displays and to sell, lease
or dedicate all or part thereof to public use; and further that Landlord shall have the right to make changes in, additions to

and eliminations from the Building, the Premises excepted; provided however that, except to the extent required by Legal
Requirements, Tenant, its employees, agents, clients, customers, and invitees shall at all times have reasonable access to
the Building and Premises. No changes shall be made to the Common Areas after the Commencement Date that would
unreasonably interfere with Tenant’s access to or use of the Premises for the purposes of this Lease. Landlord is not under
any obligation to permit individuals without proper building identification to enter the Building after 6:00 p.m.

(D)  Tenant  shall  have  a  nonexclusive  right  to  use  the  fire  stairwells  in  the  Building  (the  “Fire Stairs”)  for  the  purpose  of
access  between  the  floors  of  the  Building  on  which  the  Premises  are  located,  at  no  additional  rental  charge  to  Tenant,
provided  that  (1)  such  use  shall  be  permitted  by,  and  at  all  times  be  in  accordance  with,  all  applicable  Legal
Requirements; and (2) Tenant shall comply with all of Landlord’s reasonable rules and regulations adopted from time to
time with respect thereto. Tenant shall, at its sole cost and expense, link its key cards to the locking system on the doors in
the Fire Stairs and the floors of the Premises and tie Tenant’s security system into the Building security system, provided
that in any event such locking system must be configured in such a way so as to automatically disengage in the event of
an emergency or loss of power. Tenant shall provide Landlord with a “master” card key so that Landlord shall have access
through each entry door. Tenant shall not make any Alterations on the Fire Stairs other than such key card locking system.

(E)  Tenant  shall  have  dedicated  space  on  the  roof  of  the  Building  for  placement  of  the  air  handling  units  to  serve  the
Premises, to be installed in accordance with the terms of Exhibit B, to be in the area shown on Exhibit B-4 (the “Tenant
Roof Area”). Landlord shall be responsible, at Landlord’s sole cost and expense, for removing any existing solar panels
from the Tenant Roof Area prior to installation of the dunnage by Landlord.

2.2.1 Tenant’s Equipment.

(A) Subject to the terms and provisions of this Section 2.2.1, Tenant shall be permitted to install HVAC equipment
and  any  and  all  related  equipment  to  accommodate  Tenant’s  excess  HVAC  requirements  (collectively,  the
“Tenant’s  Equipment”)  in  a  location  or  locations  reasonably  designated  by  Landlord,  provided  that  (i)  such
installation and the operation thereof shall not cause any measurable interference with any existing communication
or  solar  equipment  at  the  Building,  and  (ii)  such  installation  does  not  adversely  affect  the  structural  elements,
Legal  Requirements  or  the  visual  aesthetic  of  the  Building  as  determined  by  Landlord  in  its  sole  discretion.  In
addition, Landlord shall have the option upon notice to Tenant to relocate the Tenant’s Equipment to other areas at
Landlord’s sole cost and expense and so long as such relocation does not materially adversely affect Tenant’s use
of the Premises. Tenant shall have no right to license, sublease, assign or otherwise

transfer its rights to install and use the Tenant’s Equipment on the Building (other than to an assignee or subtenant
permitted or consented to under this Lease). Landlord hereby reserves the sole right to the rooftop of the Building.

(B)  Tenant’s  use  of  the  Tenant’s  Equipment  shall  be  upon  all  of  the  conditions  of  the  Lease,  except  as

modified below:

(i)  It  is  understood  and  agreed  that  Tenant  shall  be  responsible,  at  its  sole  cost  and  expense,  for
installing the Tenant’s Equipment and screening reasonably required by Landlord. In addition to complying
with the applicable construction provisions of this Lease, Tenant shall not install or operate any portion of
the Tenant’s Equipment until Tenant shall have obtained Landlord’s prior written approval, which approval
will not be unreasonably withheld or delayed, of Tenant's plans and specifications therefor. Landlord will
not require Tenant’s Equipment to be removed by Tenant upon the expiration or earlier termination of this
Lease; provided, however this shall not affect or in any way limit Tenant’s obligation to remove Required
Removables in accordance with the terms of this Lease.

(ii) Landlord shall have no obligation to provide any services to the Tenant’s Equipment, provided
Tenant shall have the right to connect Tenant’s Equipment to existing base building utility systems, subject
to Landlord’s right to reasonably approve such connections. Tenant shall, at its sole cost and expense and
otherwise in accordance with the provisions of this Section 2.2.1, arrange for all utility services required
for the operation of the Tenant’s Equipment.

(iii)  Tenant  shall  separately  meter  or  check  meter  (Tenant  being  responsible  for  the  costs  of  any
such meter or check meter and the installation and connectivity thereof) electric and water service to the
Premises  in  connection  with  Tenant’s  Work  (defined  in  Exhibit  B-1).  Gas  service  has  been  separately
metered to the Premises. Tenant shall directly pay to the utility all electric consumption on any separate
meter as of the Commencement Date.

(iv)  Tenant  shall  have  no  right  to  make  any  changes,  alterations  or  other  improvements  to  the
Tenant’s  Equipment  without  Landlord’s  prior  written  consent,  which  consent  shall  not  be  unreasonably
withheld or delayed; provided, however, that Tenant shall have the right to maintain and make repairs to
the Tenant’s Equipment.

(iv) Tenant shall be responsible for the cost of repairing any damage to the Building or other tenant

spaces caused by the installation, use and removal of the Tenant’s Equipment.

(v)  Except  for  assignees  of  this  Lease  or  subtenants  of  all  or  a  portion  of  the  Premises,  no  other
person, firm or entity (including, without limitation, other tenants, licensees or occupants of the Building)
shall have the right to connect to the Tenant’s Equipment other than Tenant.

(vi) To the maximum extent permitted by law, Tenant’s use of the Tenant’s Equipment shall be at
the  sole  risk  of  Tenant,  and  Landlord  shall  have  no  liability  to  Tenant  in  the  event  that  the  Tenant’s
Equipment is damaged for any reason.

(vii)  Landlord  shall  have  the  right,  upon  no  less  than  ninety  (90)  days’  notice  to  Tenant  and  at
Landlord’s sole cost and expense, to relocate portions of the Tenant’s Equipment to another area within the
Building  reasonably  acceptable  to  Tenant.  Landlord  and  Tenant  shall  cooperate  with  each  other  in  good
faith  to  schedule  such  relocation  work  on  nights  and  weekends  so  as  to  minimize  interference  with
Tenant’s business operations

(viii) In addition to the indemnification provisions set forth in this Lease (which shall be applicable
to the Tenant’s Equipment), Tenant shall, to the maximum extent permitted by law, indemnify, defend, and
hold Landlord, its agents, contractors and employees harmless from any and all claims, losses, demands,
actions  or  causes  of  actions  suffered  by  any  person,  firm,  corporation,  or  other  entity  arising  from  the
installation, use or removal of the Tenant’s Equipment.

(C) Tenant shall, at its sole cost and expense, secure the approvals of all governmental authorities and all permits
required  by  governmental  authorities  having  jurisdiction  over  such  approvals  for  the  Tenant’s  Equipment,  and
shall  provide  Landlord  with  copies  of  such  approvals  and  permits  prior  to  commencing  any  work  with  respect
thereto.  In  addition,  Tenant  shall  be  solely  responsible  for  all  costs  and  expenses  in  connection  with  the
installation, maintenance, use and removal of the Tenant’s Equipment, except that Tenant will not be obligated to
pay  Landlord  any  rental  for  that  portion  of  the  Building  and/or  the  Site  on  which  the  Tenant’s  Equipment  is
located.  Tenant  shall  have  access  to  those  portions  of  the  Building  and/or  the  Site  on  which  the  Tenant’s
Equipment is located for the purposes of inspecting, repairing, maintaining and replacing the same, subject in all
events to Landlord’s reasonable rules and regulations regarding such access (it being

understood and agreed, without limiting the generality of the foregoing, that access to the rooftops of the Building
is controlled by Landlord).

ARTICLE III.

Lease Term and Extension Options

3.1 Term

The Term of this Lease shall be the period specified in Section 1.2 hereof as the “Lease Term,” unless sooner terminated
or extended as herein provided, and commencing on the date (the “Commencement Date”) which is the later of the (i)
Execution  Date  of  this  Lease,  or  (ii)  actual  delivery  of  the  Premises  to  Tenant  in  its  “as  is”  condition,  evidenced  by
delivery to Tenant of the keys or other access to the Premises.

3.2 Extension Option

(A) On the conditions (which conditions Landlord may waive by written notice to Tenant) that both at the time of exercise of
the herein described option to extend and as of the commencement of the Extended Term in question (i) there exists no
monetary or material non-monetary “Event of Default” (defined in Section 15.1) and there have been no more than two
(2) Event of Defaults during the twelve (12) months immediately preceding the date of Tenant’s exercise notice, (ii) this
Lease is still in full force and effect, and (iii) Tenant has neither assigned this lease nor sublet any portion thereof (except
for  an  assignment  or  sublet  of  not  more  than  twenty-five  percent  (25%)  of  the  Premises  permitted  in  accordance  with
Section  12.5  hereof),  then  Tenant  shall  have  the  right  to  extend  the  Term  hereof  upon  all  the  same  terms,  conditions,
covenants and agreements herein contained (except for the Annual Fixed Rent which shall be adjusted during the option
period as hereinbelow set forth and except that there shall be no further option to extend) for one (1) period of five (5)
years  as  hereinafter  set  forth.  The  option  period  is  sometimes  herein  referred  to  as  the  “Extended  Term.”
Notwithstanding any implication to the contrary Landlord has no obligation to make any additional payment to Tenant in
respect of any construction allowance or the like or to perform any work to the Premises as a result of the exercise by
Tenant of any such option.

(B) If Tenant desires to exercise an option to extend the Term, then Tenant shall give notice (“Exercise Notice”) to Landlord
not later than twelve (12) months (the “Extension Deadline”) prior to the expiration of the then Term of this Lease (as it
may  have  been  previously  extended)  exercising  such  option  to  extend.  If  Tenant  timely  delivers  an  Exercise  Notice,
Landlord shall, not later than ten (10) months prior to expiration of the then-current Term, provide Landlord’s quotation to
Tenant of a proposed Annual Fixed Rent for the Extended Term (“Landlord’s Rent Quotation”). If at the expiration of
thirty (30) days after the date when Landlord

provides  such  quotation  to  Tenant  (the  “Negotiation  Period”),  Landlord  and  Tenant  have  not  reached  agreement  on  a
determination of an Annual Fixed Rent for such Extended Term and executed a written instrument extending the Term of
this Lease pursuant to such agreement, then Tenant shall have the right, for thirty (30) days following the expiration of the
Negotiation  Period,  to  make  a  request  to  Landlord  for  a  broker  determination  (the  “Broker  Determination”)  of  the
Prevailing Market Rent (as defined in Exhibit H) for such Extended Term, which Broker Determination shall be made in
the manner set forth in Exhibit H. If Tenant timely shall have requested the Broker Determination, then the Annual Fixed
Rent for such Extended Term shall be the Prevailing Market Rent as determined by the Broker Determination. If Tenant
does not timely request the Broker Determination, then the Annual Fixed Rent during the Extended Term shall be equal to
the Landlord’s Rent Quotation.

(C) Upon the giving of the Exercise Notice by Tenant to Landlord exercising Tenant’s option to extend the Lease Term in
accordance with the provisions of Section 3.2 (B) above, then this Lease and the Lease Term hereof shall automatically be
deemed extended, for the Extended Term, without the necessity for the execution of any additional documents, except that
Landlord  and  Tenant  agree  to  enter  into  an  instrument  in  writing  setting  forth  the  Annual  Fixed  Rent  for  the  Extended
Term  as  determined  in  the  relevant  manner  set  forth  in  this  Section  3.2;  and  in  such  event  all  references  herein  to  the
Lease Term or the Term of this Lease shall be construed as referring to the Lease Term, as so extended, unless the context
clearly otherwise requires, and except that there shall be no further option to extend the Lease Term.

ARTICLE IV.

Condition of Premises; Alterations

4.1 Preparation of Premises

The  condition  of  the  Premises  upon  Landlord’s  delivery  along  with  any  work  to  be  performed  by  either  Landlord  or
Tenant shall be as set forth in the Work Agreement attached hereto as Exhibit B-1 and made a part hereof.

ARTICLE V.

Annual Fixed Rent

5.1 Fixed Rent

Commencing  on  the  date  that  is  one  hundred  eighty  (180)  days  following  the  Commencement  Date  (the  “Rent
Commencement Date”), but subject to extension for Landlord Delays in accordance with Exhibit B-1 attached hereto,
Tenant agrees to pay to Landlord, and thereafter monthly, in advance, on the first day of each and every calendar month
during the Original Lease Term, a sum equal to one-twelfth (1/12) of the Annual Fixed Rent for the Premises specified in
Section 1.2 hereof and

on the first day of each and every calendar month during the Extended Term (if exercised), a sum equal to one-twelfth of
the Annual Fixed Rent for the Premises as determined in Section 3.2 for the Extended Term. Until notice of some other
designation is given, fixed rent and all other charges for which provision is herein made shall be paid by remittance to or
for the order of Landlord by ACH transfer in accordance with the ACH Directive on Exhibit E.

Annual Fixed Rent for any partial month shall be paid by Tenant to Landlord at such rate on a pro rata basis, and, if the
Commencement Date shall be other than the first day of a calendar month, the first payment of Annual Fixed Rent which
Tenant shall make to Landlord shall be a payment equal to a proportionate part of such monthly Annual Fixed Rent for the
partial month from the Commencement Date to the first day of the succeeding calendar month.

Notwithstanding  that  the  payment  of  Annual  Fixed  Rent  payable  by  Tenant  to  Landlord  shall  not  commence  until  the
Commencement Date, Tenant shall be subject to, and shall comply with, all other provisions of this Lease as and at the
times provided in this Lease.

The  Annual  Fixed  Rent  and  all  other  charges  for  which  provision  is  made  in  this  Lease  shall  be  paid  by  Tenant  to
Landlord without setoff, deduction or abatement except as expressly provided in this Lease.

5.2 Additional Rent

Additional Rent payable by Tenant on a monthly basis, as elsewhere provided in this Lease, likewise shall be prorated,
and  the  first  payment  on  account  thereof  shall  be  determined  in  similar  fashion  and  shall  commence  on  the
Commencement Date and other provisions of this Lease calling for monthly payments shall be read as incorporating this
undertaking by Tenant.

6.1 Definitions

ARTICLE VI.

Taxes

With  reference  to  the  real  estate  taxes  referred  to  in  this  Article  VI,  it  is  agreed  that  terms  used  herein  are  defined  as
follows:

a.

“Tax  Year”  means  the  12  month  period  beginning  July  1  each  year  during  the  Lease  Term  or  if  the
appropriate Governmental tax fiscal period shall begin on any date other than July 1, such other date.

b.

c.

d.

“Landlord’s  Tax  Expenses  Allocable  to  the  Premises”  means  the  same  proportion  of  Landlord’s  Tax
Expenses  as  Rentable  Floor  Area  of  Tenant’s  Premises  bears  to  the  Total  Rentable  Floor  Area  of  the
Building.

“Landlord’s  Tax  Expenses”  with  respect  to  any  Tax  Year  means  the  aggregate  “real  estate
taxes”(hereinafter  defined)  with  respect  to  that  Tax  Year,  reduced  by  any  net  abatement  receipts  with
respect to that Tax Year. In  no  event  shall  Landlord  be  entitled  to  retain  more  than  one  hundred  percent
(100%) of the Landlord’s Tax Expenses actually paid or incurred by Landlord in any Tax Year, subject to
Landlord’s right to seek tax reductions or abatements as set forth in this Lease.

“Real estate taxes”  means all taxes and  special  assessments  of  every  kind  and  nature  and  user  fees and
other  like  fees  assessed  by  any  Governmental  authority  on,  or  allocable  to  (i)  the  Building  or  (ii)  the
Common  Areas  which  the  Landlord  shall  be  obligated  to  pay  because  of  or  in  connection  with  the
ownership,  leasing  or  operation  of  the  Building  and  reasonable  expenses  of  and  fees  for  any  formal  or
informal  proceedings  for  negotiation  or  abatement  of  taxes  (collectively,  “Abatement  Expenses”).  The
amount  of  special  taxes  or  special  assessments  to  be  included  shall  be  limited  to  the  amount  of  the
installment  (plus  any  interest  other  than  penalty  interest  payable  thereon)  of  such  special  tax  or  special
assessment required to be paid during the year in respect of which such taxes are being determined. There
shall be excluded from real estate taxes all mitigation or impact fees or subsidies associated with the initial
construction of the Building, all income, estate, succession, inheritance and transfer taxes, any excise taxes
imposed upon Landlord based upon gross or net rentals or other income received by it and any interest,
penalties or fines incurred as a result of Landlord’s late payment of real estate taxes (except to the extent
such  late  payment  is  the  result  of  late  payment  of  Annual  Fixed  Rent  or  Additional  Rent  by  Tenant);
provided, however, that if at any time during the Lease Term the present system of ad valorem taxation of
real property shall be changed so that in lieu of, or in addition to, the whole or any part of the ad valorem
tax  on  real  property,  there  shall  be  assessed  on  Landlord  a  capital  levy  or  other  tax  on  the  gross  rents
received  with  respect  to  the  Building,  or  a  Federal,  State,  County,  Municipal,  or  other  local  income,
franchise,  excise  or  similar  tax,  assessment,  levy  or  charge  (distinct  from  any  now  in  effect  in  the
jurisdiction  in  which  the  Building  is  located)  measured  by  or  based,  in  whole  or  in  part,  upon  any  such
gross  rents,  then  any  and  all  of  such  taxes,  assessments,  levies  or  charges,  to  the  extent  so  measured  or
based, shall be deemed to be included within the term “real estate taxes” but only to the extent

that the same would be payable if the Building, were the only property of Landlord. For the purposes of
this  Lease,  real  estate  taxes  shall  include  any  payment  in  lieu  of  taxes  or  any  payments  made  under
Chapter 121A of the Massachusetts General Laws or any similar law.

6.2 Tenant’s Share of Real Estate Taxes

Commencing as of the Rent Commencement Date and continuing thereafter throughout the remainder of the Lease Term,
Tenant shall pay to Landlord, as Additional Rent with respect to any full Tax Year or fraction of a Tax Year falling within
the  Lease  Term,  the  amount  of  Landlord’s  Tax  Expenses  Allocable  to  the  Premises  (the  “Tenant’s  Tax  Payment”).
Tenant’s obligation to pay Landlord’s Tax Expenses Allocable to the Premises with respect to the Tax Years in which the
Commencement Date occurs and the termination of the Lease Term occurs shall be pro-rated based upon the ratio of the
portion of such Tax Years which occur during the Lease Term to the total length of such Tax Years. Payments by Tenant
on  account  of  the  Tenant’s  Tax  Payment  shall  be  made  monthly  at  the  time  and  in  the  fashion  herein  provided  for  the
payment of Annual Fixed Rent. The amount so to be paid to Landlord shall be an amount from time to time reasonably
estimated by Landlord to be sufficient to provide Landlord, in the aggregate, a sum equal to the Tenant’s Tax Payment, at
least ten (10) days before the day on which tax payments by Landlord would become delinquent. Not later than ninety
(90) days after Landlord’s Tax Expenses Allocable to the Premises are determinable for the first such Tax Year or fraction
thereof  and  for  each  succeeding  Tax  Year  or  fraction  thereof  during  the  Lease  Term,  Landlord  shall  render  Tenant  a
statement in reasonable detail certified by a representative of Landlord showing for the preceding year or fraction thereof,
as  the  case  may  be,  real  estate  taxes  allocated  to  the  Building,  abatements  and  refunds,  if  any,  of  any  such  taxes  and
assessments,  expenditures  incurred  in  seeking  such  abatement  or  refund,  the  amount  of  the  Tenant’s  Tax  Payment  due
from  Tenant,  the  amount  thereof  already  paid  by  Tenant  and  the  amount  thereof  overpaid  by,  or  remaining  due  from,
Tenant for the period covered by such statement. Within thirty (30) days after the receipt of such statement, Tenant shall
pay any sum remaining due. Any balance shown as due to Tenant shall be credited against Annual Fixed Rent next due, or
refunded to Tenant if the Lease Term has then expired and Tenant has no further obligation to Landlord. Expenditures for
legal fees and for other expenses incurred in obtaining an abatement or refund may be charged against the abatement or
refund  before  the  adjustments  are  made  for  the  Tax  Year  to  the  extent  such  costs  were  not  already  included  in  the
calculation of real estate taxes.

To the extent that real estate taxes shall be payable to the taxing authority in installments with respect to periods less than
a  Tax  Year,  the  statement  to  be  furnished  by  Landlord  shall  be  rendered  and  payments  made  on  account  of  such
installments.

ARTICLE VII.

Landlord’s Repairs and Services and Tenant’s Escalation Payments

7.1 Structural Repairs

Except for (a) normal and reasonable wear and use and (b) damage caused by fire or casualty and by eminent domain,
Landlord shall, throughout the Lease Term, subject to provisions for reimbursement by Tenant as contained in Section 7.4
and  Section  7.5  (including  the  exclusions  from  Landlord’s  Operating  Expenses  set  forth  in  said  Section  7.4),  keep  and
maintain, or cause to be kept and maintained, in good order, condition and repair the following portions of the Building:
the structural portions of the roof (including the roof membrane), the exterior and load bearing walls, the foundation, the
structural columns and floor slabs and other structural elements of the Building (the “Structural Elements”);  provided
however, that Tenant shall pay to Landlord, as Additional Rent, the cost of any and all such repairs which may be required
as a result of repairs, alterations, or installations made by Tenant or any subtenant, assignee, licensee or concessionaire of
Tenant or any agent, servant, employee or contractor of any of them or to the extent of any loss, destruction or damage
caused  by  the  omission  or  negligence  of  Tenant,  any  assignee  or  subtenant  or  any  agent,  servant,  employee,  customer,
visitor or contractor of any of them.

7.2 Other Repairs to be Made by Landlord

Except for (a) normal and reasonable wear and use and (b) damage caused by fire or casualty and by eminent domain, and
except  as  otherwise  provided  in  this  Lease,  and  subject  to  provisions  for  reimbursement  by  Tenant  as  contained  in
Section 7.4 and Section 7.5 (including the exclusions from Landlord’s Operating Expenses set forth in said Section 7.4),
Landlord shall keep, maintain and repair (including necessary replacements) or cause to be kept, maintained and repaired,
in good order, condition and repair the mechanical, electrical, plumbing, sprinkler, fire/life safety, access control and the
heating, ventilating and air conditioning (“HVAC”) systems serving the Premises and the Building (but exclusive of any
specialty installations installed or requested by Tenant that exclusively serve the Premises which shall be maintained at
Tenant’s sole cost and expense), the main utility pipes, lines and facilities connecting the Building to off-site electric and
water utility providers (except for any such pipes, lines and other facilities owned and maintained by the utility provider)
and the Common Areas and to maintain the Building (exclusive of Tenant’s responsibilities under this Lease) in a manner
comparable to the maintenance of similar office buildings in the Market Area, except that Landlord shall in no event be
responsible to Tenant for (a) the condition of glass in and about the Premises (other than for glass in exterior walls for
which Landlord shall be responsible unless the damage thereto is attributable to Tenant’s negligence or misuse, in which
event the responsibility

therefor shall be Tenant’s), or (b) any condition in the Premises or the Building caused by any act or neglect of Tenant or
any agent, employee, contractor, assignee, subtenant, licensee, concessionaire or invitee of Tenant. For purposes of this
Section  7.2,  none  of  the  Building  systems  installed  by  Landlord  shall  be  deemed  “requested  by  Tenant”.  Without
limitation, Landlord shall not be responsible to make any improvements or repairs to the Premises or the Building other
than  as  expressly  provided  in  Section  7.1  or  in  this  Section  7.2,  unless  expressly  otherwise  provided  in  this  Lease
(including, without limitation, in Article XIII below). Landlord shall use reasonable efforts to perform all repairs in or to
the Building for which Landlord is responsible pursuant to this Lease within a reasonable period of time after Landlord
becomes aware of the need for such repair and, except in the event of an emergency or unsafe condition in the Building,
in  a  manner  which  will  not  unreasonably  interfere  with  the  use  of  the  Building  by  Tenant  or  other  occupants  of  the
Premises.

Subject to Tenant’s obligations under Section 8.1, Landlord shall comply with all applicable Legal Requirements now or
hereafter  in  force  that  impose  a  duty  on  Landlord  with  respect  to  the  common  areas  of  the  Building  or  which  Legal
Requirements are imposed generally on a building wide basis to the Building (and which requirements are not imposed or
triggered as a result of the particular use or manner of use of any tenant or occupant in the Building, including Tenant, or
due to any additions, alterations or improvements by any other tenant occupant of the Building, including Tenant).

Tenant acknowledges that Landlord has or will submit a Historic Preservation Certification Application provided for in
Title 36 of the Code of Federal Regulations, Part 67 in order to obtain the benefit of Historic Tax Credits in connection
with Landlord’s rehabilitation of the Building. Notwithstanding anything to the contrary contained in this Lease, Tenant
shall not, nor shall Landlord be required to, make any repairs, replacements, alterations or other improvements that would
be inconsistent with the standards for rehabilitation set forth in Title 36 of the Code of Federal Regulations, Part 67.7, or
any successor provisions, as amended from time to time, or otherwise effect a recapture, violate any historic preservation
restrictions of which Tenant has notice or otherwise impact the Historic Tax Credits issued or to be issued in connection
with the rehabilitation of the Building.

7.3 Services to be Provided by Landlord

In  addition,  and  except  as  otherwise  provided  in  this  Lease  and  subject  to  provisions  for  reimbursement  by  Tenant  as
contained  in  Section  7.4  and  Section  7.5  (including  the,  Landlord  shall  operate  the  Building  and,  from  and  after  the
Commencement Date, furnish services, utilities, facilities and supplies as set forth in Exhibit C  hereto  equal  in  quality
comparable  to  those  customarily  provided  by  landlords  in  similar  office  buildings  in  the  Market  Area.  In  addition,
Landlord  agrees  to  furnish,  at  Tenant’s  expense,  reasonable  additional  Building  operation  services  which  are  usual  and
customary in similar office buildings in the Market Area as may be mutually agreed

upon  by  Landlord  and  Tenant,  upon  reasonable  and  equitable  rates  from  time  to  time  established  by  Landlord.  Any
provision of additional Building operation services shall be submitted by Tenant through the Building’s system for Tenant
work requests. Tenant  agrees  to  pay  to  Landlord,  as  Additional  Rent,  the  cost  of  any  such  additional  Building  services
requested by Tenant and for the cost of any additions, alterations, improvements or other work performed by Landlord in
the Premises at the request of Tenant within thirty (30) days after being billed therefor.

7.4 Operating Costs Defined

“Operating Expenses Allocable to the Premises” means the same proportion of the Landlord’s Operating Expenses (as
hereinafter defined) as Rentable Floor Area of the Premises bears to the Total Rentable Floor Area of the Building.

“Landlord’s Operating Expenses” means the cost of operation of the Building, including those incurred in discharging
the  obligations  under  Sections  7.2  and  7.3,  but  excluding  payments  of  debt  service  and  any  other  mortgage  charges,
brokerage commissions, real estate taxes (to the extent paid pursuant to Section 6.2 hereof), and costs of special services
rendered to tenants (including Tenant) for which a separate charge is made, but shall include, without limitation:

a.

b.

c.

d.

e.

f.

g.

compensation, wages and all fringe benefits, worker’s compensation insurance premiums and payroll taxes
paid  to,  for  or  with  respect  to  all  persons  for  their  services  in  the  operating,  maintaining,  managing,
insuring or cleaning of the Building;

payments  under  service  contracts  with  independent  contractors  for  operating,  maintaining  or  cleaning  of
the Building;

steam,  water,  sewer,  gas,  oil,  electricity  and  telephone  charges  (excluding  such  utility  charges  separately
chargeable to tenants for additional or separate services and costs to supply electricity to leasable areas of
the Building with the  exception  of  any  building  management  offices)  and  costs of maintaining letters of
credit or other security as may be required by utility companies as a condition of providing such services;

cost  of  maintenance,  cleaning  and  repairs  and  replacements  (other  than  repairs  reimbursable  from
contractors under guarantees);

cost of snow removal and care of landscaping;

cost of building and cleaning supplies and equipment;

premiums  for  insurance  carried  with  respect  to  the  Building  (including,  without  limitation,  liability
insurance, insurance against loss in case of

h.

i.

fire or casualty and of monthly installments of Annual Fixed Rent and any Additional Rent which may be
due under this Lease and other leases of space in the Building for not more than twelve (12) months in the
case of both Annual Fixed Rent and Additional Rent and, if there be any first mortgage on the Building,
including such insurance as may be required by the holder of such first mortgage, provided, however, with
respect to insurance coverages required to be carried by a holder of a mortgage such coverages are of the
type and amounts customarily required to be carried by lenders of comparable class A, multi-tenant office
buildings in the Market Area);

management  fees  equal  to  three  percent  (3%)  of  Gross  Receivable  Rents  for  the  Building  (“Gross
Receivable Rents for the Building” for the purposes hereof being defined as annual fixed rent, Landlord’s
Operating Expenses, with the exception of the aforesaid management fee, and Landlord’s Tax Expenses for
the Building for the relevant year);

depreciation  for  capital  expenditures  made  by  Landlord  during  the  Lease  Term  (x)  to  reduce  Operating
Expenses  if  Landlord  shall  have  reasonably  determined  on  the  basis  of  engineering  estimates  that  the
annual reduction in Operating Expenses shall exceed the annual depreciation therefor or (y) to comply with
Legal  Requirements  which  first  become  applicable  to  the  Property  after  the  Commencement  Date  (the
capital  expenditures  described  in  subsections  (x)  and  (y)  being  hereinafter  referred  to  as  “Permitted
Capital Expenditures”) plus, in the case of both (x) and (y), an interest factor, reasonably determined by
Landlord, as being the interest rate then charged for long term mortgages by institutional lenders on like
properties within the general locality in which the Building is located, and depreciation in the case of both
(x) and (y) shall be determined by dividing the original cost of such capital expenditure by the number of
years  of  useful  life  of  the  capital  item  acquired,  which  useful  life  shall  be  determined  reasonably  by
Landlord in accordance with generally accepted accounting principles and practices in effect at the time of
acquisition of the capital item;

j.

all  costs  of  applying  and  reporting  for  the  Building  or  any  part  thereof  to  seek  or  maintain  certification
under the U.S. EPA’s Energy Star® rating system, the U.S. Green Building Council’s Leadership in Energy
and Environmental Design (LEED) rating system or a similar system or standard; and

k.

all  other  reasonable  and  necessary  expenses  paid  in  connection  with  the  operating,  cleaning  and
maintenance of the Building or the Common Areas and properly chargeable against income.

Notwithstanding the generality of foregoing, the following costs shall be excluded or deducted, as the case may be, from
the calculation of Operating Expenses Allocable to the Premises:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

(ix)

leasing  commissions,  fees  and  costs,  advertising  and  promotional  expenses  and  other  costs  incurred  in
procuring tenants or in selling the Building;

legal fees or other expenses incurred in connection with enforcing leases with tenants in the Building;

costs of renovating or otherwise improving or decorating space for any tenant or other occupant of the
Building (including Tenant) or relocating any tenant;

financing costs including interest and principal amortization of debts and the costs of providing the same;

except  as  otherwise  expressly  provided  above  with  respect  to  Permitted  Capital  Expenditures,
depreciation;

rental on ground leases or other underlying leases and the costs of providing the same;

wages, bonuses and other compensation of employees above the grade of Regional Property Manager;

wages, bonuses and other compensation of any employee who does not devote substantially all of his or
her employed time to the Building unless such wages and benefits are prorated on a reasonable basis to
reflect  time  spent  on  the  operation  and  management  of  the  Building  vis(cid:0)à(cid:0)vis  time  spent  on  matters
unrelated to the operation and management of the Building;

any liabilities, costs or expenses associated with or incurred in connection with the removal, enclosure,
encapsulation  or  other  handling  of  Hazardous  Materials  and  the  cost  of  defending  against  claims  in
regard to the existence or release of Hazardous Materials at the Building (except with respect to those
costs  for  which  Tenant  is  otherwise  responsible  pursuant  to  the  express  terms  of  the  Lease),  provided,
however,  that  the  provisions  of  this  clause  shall  not  preclude  the  inclusion  of  costs  with  respect  to
materials which are

not  as  of  the  date  of  this  Lease  (or  as  of  the  date  of  introduction)  deemed  to  be  Hazardous  Materials
under  applicable  Legal  Requirements  but  which  are  subsequently  deemed  to  be  Hazardous  Materials
under applicable Legal Requirements;

costs of any items for which Landlord is or is entitled to be paid or reimbursed by insurance;

increased  insurance  or  Real  Estate  Taxes  assessed  specifically  to  any  tenant  of  the  Building  for  which
Landlord is entitled to reimbursement from any other tenant;

except as may be expressly set forth in this Lease, the cost of installing, operating and maintaining any
specialty service, such as an observatory, broadcasting facilities, child or daycare;

costs for the original construction and development of the Building and nonrecurring costs for the repair
and  replacement  of  any  portion  of  the  Building  made  necessary  as  a  result  of  defects  in  the  original
design, workmanship or materials;

cost of any work or service performed on an extra cost basis for any tenant in the Building to the extent
such work or service is in excess of any work or service Landlord is obligated to provide to Tenant or
generally to other tenants in the Building at Landlord’s expense;

cost of any work or services to the extent performed for any facility other than the Building;

except  as  may  be  otherwise  expressly  provided  in  the  Lease  with  respect  to  specific  items,  any  cost
representing an amount paid to a person firm, corporation or other entity related to Landlord that is in
excess of the amount which would have been paid in the absence of such relationship;

except  as  expressly  provided  above,  cost  of  any  item  that,  under  generally  accepted  accounting
principles, are properly classified as capital expenses;

lease payments for rental equipment (other than equipment for which depreciation is properly charged as
an expense) that would constitute a capital expenditure if the equipment were purchased;

late  fees  or  charges  incurred  by  Landlord  due  to  late  payment  of  expenses,  except  to  the  extent
attributable to Tenant’s actions or inactions;

(x)

(xi)

(xii)

(xiii)

(xiv)

(xv)

(xvi)

(xvii)

(xviii)

(xix)

(xx)

(xxi)

(xxii)

(xxiii)

(xxiv)

(xxv)

(xxvi)

(xxvii)

(xxviii)

(xxix)

(xxx)

cost  of  acquiring  sculptures,  paintings  and  other  works  of  art,  and  the  costs  for  securing,  cleaning  or
maintaining such items in excess of amounts typically spent for such services in comparable buildings in
the Market Area;

real estate taxes or taxes on Landlord’s business (such as income, excess profits, franchise, capital stock,
estate, inheritance, etc.);

charitable or political contributions;

reserve funds;

all other items for which another party compensates or pays so that Landlord shall not recover any item
of cost more than once;

costs  and  expenses  incurred  in  connection  with  compliance  with  or  contesting  or  settlement  of  any
claimed violation of law or requirements of law, except to the extent attributable to Tenant’s actions or
inactions;

costs and expenses incurred for the administration of the entity which constitutes Landlord, as the same
distinguished from the cost of operation, management, maintenance and repair of the Building;

except  with  respect  to  the  management  fee,  Landlord’s  general  off-site,  on-site  and  overhead  expenses
(provided, however, that the provisions of this clause 31 shall not prohibit the inclusion of costs of the
following  items  in  Operating  Expenses:  professional  development  for  management  staff,  professional
subscriptions  and  dues,  telephone,  postage,  software  licenses,  computer  hardware  maintenance,
maintenance of Landlord’s computer network, catering for meetings and general administrative expenses
including  supplies,  copier  leases,  printer  maintenance,  printing  services  and  kitchen  supplies  for  the
management and contractor offices serving the Building);

any  compensation  paid  to  clerks,  attendants  or  other  persons  in  commercial  concessions  operated  by
Landlord;

costs arising from the willful misconduct or negligence of Landlord, its agents, employees or contractors;

fees, costs and expenses incurred by Landlord in connection with or relating to claims against or disputes
with employees of Landlord, with Building management, or with tenants of the Building.

Notwithstanding anything to the contrary contained herein, the Operating Expenses listed on Exhibit M attached hereto
(“Controllable Expenses”) shall not increase by more than five percent (5%) per Operating Year, on a non-cumulative
basis, over the actual aggregate Controllable Expenses for the immediately preceding Operating Year.

7.5 Tenant’s Operating Expense Payments

a.

b.

c.

d.

Commencing  as  of  the  Rent  Commencement  Date,  and  continuing  thereafter  throughout  the  remainder  of  the
Lease Term, Tenant shall pay to Landlord, as Additional Rent with respect to any full calendar year or fraction of a
calendar  year  falling  within  the  Lease  Term,  at  the  times  and  in  the  manner  hereinafter  provided  in  this
Section  7.5,  Operating  Expenses  Allocable  to  the  Premises.  Tenant’s  obligation  to  pay  Operating  Expenses
Allocable  to  the  Premises  with  respect  to  the  calendar  years  in  which  the  Commencement  Date  occurs  and  the
termination of the Lease Term occurs shall be pro(cid:0)rated based upon the ratio of the portion of such calendar years
which occur during the Lease Term to the total length of such calendar years.

Payments by Tenant on account of the Operating Expenses Allocable to the Premises shall be made monthly at the
time  and  in  the  fashion  herein  provided  for  the  payment  of  Annual  Fixed  Rent.  The  amount  so  to  be  paid  to
Landlord shall be an amount from time to time reasonably estimated by Landlord to be sufficient to cover, in the
aggregate,  a  sum  equal  to  the  Operating  Expenses  Allocable  to  the  Premises  for  each  calendar  year  during  the
Lease Term.

No  later  than  one  hundred  twenty  (120)  days  after  the  end  of  the  first  calendar  year  or  fraction  thereof  ending
December  31  and  of  each  succeeding  calendar  year  during  the  Lease  Term  or  fraction  thereof  at  the  end  of  the
Lease  Term,  Landlord  shall  render  Tenant  a  statement  in  reasonable  detail  and  according  to  usual  accounting
practices  certified  by  a  representative  of  Landlord  (the  “Operating  Expense  Statement”),  showing  for  the
preceding  calendar  year  or  fraction  thereof,  as  the  case  may  be,  the  Landlord’s  Operating  Expenses  and  the
Operating  Expenses  Allocable  to  the  Premises.  Said  statement  to  be  rendered  to  Tenant  also  shall  show  for  the
preceding  year  or  fraction  thereof,  as  the  case  may  be,  the  amounts  already  paid  by  Tenant  on  account  of
Operating Expenses Allocable to the Premises and the amount of Operating Expenses Allocable to the Premises
remaining due from, or overpaid by, Tenant for the year or other period covered by such statement.

If such statement shows a balance remaining due to Landlord, Tenant shall pay same to Landlord on or before the
thirtieth (30th) day following receipt by Tenant of said Operating Expense Statement. Any balance shown as due to
Tenant  shall  be  credited  against  Annual  Fixed  Rent  next  due,  or  refunded  to  Tenant  if  the  Lease  Term  has  then
expired and Tenant has no further obligation to Landlord.

e.

Landlord’s failure to render or delay in rendering an Operating Expense Statement or Tax Expense Statement (as
hereinafter defined) with respect to any Operating Year or Tax Year, as applicable, shall not prejudice Landlord’s
right thereafter to render the same with respect thereto nor shall the rendering of an Operating Expense Statement
or Tax Expense Statement, as applicable, for any Operating Year or Tax Year, as applicable, prejudice Landlord’s
right thereafter to render a corrected Operating Expense Statement or Tax Expense Statement, as applicable, for
such  Operating  Year  or  Tax  Year,  as  applicable,  provided,  however,  that  Landlord  shall  in  all  events  render  the
Operating  Expense  Statement  or  Tax  Expense  Statement,  as  applicable,  in  question  or  any  corrections  thereto
within  two  (2)  years  after  the  end  of  the  Operating  Year  or  Tax  Year,  as  applicable,  covered  by  the  applicable
statement,  and  provided,  further  that  the  foregoing  two  (2)  year  period  shall  expressly  not  apply  to  any  new  or
corrected Operating Expense Statement or Tax Expense Statement, as applicable, rendered by Landlord to reflect
charges or corrections in charges resulting from any late billing or corrected billing by a third party such as the
taxing authority or utility provider.

Any payment by Tenant for the Operating Expenses Allocable to the Premises shall not be deemed to waive any rights of
Tenant to claim that the amount thereof was not determined in accordance with the provisions of this Lease.

7.6 Tenant’s Audit Right

Subject to the provisions of this Section 7.6 and provided that no Event of Default of Tenant exists, Tenant shall have the
right  to  examine  the  correctness  of  any  of  the  Landlord’s  Tax  Expenses  statement  (“Tax  Expense  Statement”)  and/or
Landlord’s Operating Expense Statement or any item contained therein:

(1) Any request for examination in respect of any Tax Year or Operating Year (as hereinafter defined) may be made by
notice  from  Tenant  to  Landlord  no  more  than  one  hundred  twenty  (120)  days  after  the  date  (the  “Statement
Date”)  Landlord  provides  to  Tenant  the  applicable  year-end  statement  required  hereunder  in  respect  of  such
Operating Year or such Tax Year, as applicable (and only if Tenant shall have fully paid the amounts billed with
respect to the applicable Operating Expenses, Taxes). Such notice shall set forth in reasonable detail the matters
questioned. “Operating Year” shall mean a period of twelve (12) consecutive calendar months, commencing on
the first day of January in each year, except that the first Operating Year of the Lease Term hereof shall be the
period commencing on the Commencement Date and ending on the succeeding December 31, and the last Lease
Year  of  the  Lease  Term  hereof  shall  be  the  period  commencing  on  January  1  of  the  calendar  year  in  which  the
Lease Term ends, and ending with the date on which the Lease Term ends.

(2)  Tenant  hereby  acknowledges  and  agrees  that  Tenant’s  sole  right  to  contest  any  Operating  Expense  Statement  and
Landlord’s Tax Expenses Statement shall be as expressly set forth in this Section 7.6. Tenant hereby waives any
and all other rights provided pursuant to applicable laws to inspect Landlord’s books and records and/or to contest
any  Landlord’s  Operating  Expenses  Statement,  and  Landlord’s  Tax  Expense  Statement.  If  Tenant  shall  fail  to
timely exercise Tenant’s right to inspect Landlord’s books and records as provided in this Section 7.6, or if Tenant
shall fail to timely communicate to Landlord the results of Tenant’s examination as provided in this Section 7.6,
with respect to any Operating Year or Tax Year, as applicable, then such Operating Expense Statement and/or Tax
Expense Statement, as applicable, shall be conclusive and binding on Tenant.

(3)  So  much  of  Landlord’s  books  and  records  pertaining  to  the  Landlord’s  Operating  Expenses  and/or  Landlord’s  Tax
Expenses, as applicable, for the specific matters questioned by Tenant for the Operating Year or Tax Year included
in the applicable year-end statement shall be made available to Tenant within sixty (60) days after Landlord timely
receives  the  notice  from  Tenant  to  make  such  examination  pursuant  to  this  Section  7.6,  either  electronically  or
during normal business hours at the offices where Landlord keeps such books and records or at another location,
as  determined  by  Landlord.  Any  examination  must  be  completed  and  the  results  communicated  to  Landlord  no
more  than  one  hundred  twenty  (120)  days  after  the  date  Landlord  makes  its  books  and  records  available  for
Tenant’s audit.

(4) Tenant shall have the right to make such examination no more than once in respect of any Operating Year or Tax Year,
as applicable, in which Landlord has given Tenant an Operating Expense Statement or, Tax Expense Statement, as
applicable.

(5)  Such  examination  may  be  made  only  by  a  qualified  employee  of  Tenant  or  a  qualified  independent,  real  estate
professional with at least ten (10) years of relevant office leasing audit experience approved by Landlord, which
approval  in  either  case  shall  not  be  unreasonably  withheld,  conditioned  or  delayed.  No  examination  shall  be
conducted by an examiner who is to be compensated, in whole or in part, on a contingent fee basis.

(6) As a condition to performing any such examination, Tenant and its examiners shall be required to execute and deliver
to Landlord an agreement, in form reasonably acceptable to Landlord and Tenant, agreeing to keep confidential
any information which it discovers about Landlord or the Building in connection with such examination, provided
however, that Tenant may disclose such information (i) to Tenant’s employees, counsel and advisors who have the
need to know such information in order to provide Tenant with advice in connection with such audit, (ii) actual or
proposed successors,

assigns, subtenants, lenders or purchasers of Tenant and (iii) to the extent required by applicable law or reporting
requirements or by administrative, governmental or judicial proceeding.

(7)  No  subtenant  shall  have  any  right  to  conduct  any  such  examination  and  no  assignee  may  conduct  any  such

examination with respect to any period during which the assignee was not in possession of the Premises.

(8) If as a result of such examination Landlord and Tenant agree that the amounts paid by Tenant to Landlord on account
of the Landlord’s Operating Expenses or Landlord’s Tax Expenses allocable to the Premises exceeded the amounts
to  which  Landlord  was  entitled  hereunder,  or  that  Tenant  is  entitled  to  a  credit  with  respect  to  the  Landlord’s
Operating Expenses or Landlord’s Tax Expenses, Landlord, at its option, shall either refund to Tenant the amount
of such excess, or apply the amount of such credit against Annual Fixed Rent and Additional Rent, as the case
may be, within thirty (30) days after the date of such agreement. Similarly, if Landlord and Tenant agree that the
amounts paid by Tenant to Landlord on account of Landlord’s Operating Expenses or Landlord’s Tax Expenses, as
applicable,  were  less  than  the  amounts  to  which  Landlord  was  entitled  hereunder,  then  Tenant  shall  pay  to
Landlord,  as  Additional  Rent  hereunder,  the  amount  of  such  deficiency  within  thirty  (30)  days  after  the  date  of
such agreement.

(9) All  costs  and  expenses  of  any  such  examination  shall  be  paid  by  Tenant,  except  if  as  a  result  of  such  examination
Landlord  and  Tenant  agree  that  the  amount  of  the  Landlord’s  Operating  Expenses  payable  by  Tenant  was
overstated  by  more  than  four  percent  (4%),  Landlord  shall  reimburse  Tenant  for  the  actual,  reasonable  out  of
pocket costs and expenses incurred by Tenant in such examination, up to a maximum of Five Thousand Dollars
($5,000.00).

7.7 No Damage

A.

Except  as  may  be  expressly  set  forth  in  Section  7.7(C)  below,  Landlord  shall  not  be  liable  to  Tenant  for  any
compensation or reduction of rent by reason of inconvenience or annoyance or for loss of business arising from
the  necessity  of  Landlord  or  its  agents  entering  the  Premises  for  any  purposes  in  this  Lease  authorized,  or  for
repairing  the  Premises  or  any  portion  of  the  Building  however  the  necessity  may  occur.  In  case  Landlord  is
prevented  or  delayed  from  making  any  repairs,  alterations  or  improvements,  or  furnishing  any  services  or
performing  any  other  covenant  or  duty  to  be  performed  on  Landlord’s  part,  by  reason  of  any  cause  reasonably
beyond Landlord’s control, including, without limitation, by reason of Force Majeure (as defined in Section 14.1
hereof) or for any cause due to any act or neglect of Tenant or Tenant’s servants, agents, employees, licensees or
any person claiming by, through or under Tenant, Landlord shall not be liable to Tenant therefor, nor,

B.

C.

except as expressly otherwise provided in this Lease, shall Tenant be entitled to any abatement or reduction of rent
by reason thereof, or right to terminate this Lease, nor shall the same give rise to a claim in Tenant’s favor that
such failure constitutes actual or constructive, total or partial, eviction from the Premises.

Landlord  reserves  the  right  to  stop  any  service  or  utility  system,  when  necessary  by  reason  of  accident  or
emergency, or until necessary repairs have been completed; provided, however, that in each instance of stoppage,
Landlord shall exercise reasonable diligence to eliminate the cause thereof. Except in case of emergency repairs,
Landlord will give Tenant reasonable advance notice of any contemplated stoppage and will use reasonable efforts
to avoid unnecessary inconvenience to Tenant by reason thereof.

Notwithstanding  anything  to  the  contrary  in  this  Lease  contained,  if  due  to  (i)  any  repairs,  alterations,
replacements,  or  improvements  made  by  Landlord,  (ii)  Landlord's  failure  to  make  any  repairs,  alterations,  or
improvements required to be made by Landlord hereunder, or to provide any service required to be provided by
Landlord hereunder, or (iii) the failure of electric supply, water and/or sewer service, all elevator service, HVAC
service or all access to the Premises, any portion of the Premises becomes untenantable so that for the Premises
Untenantability  Cure  Period,  as  hereinafter  defined,  the  continued  operation  in  the  ordinary  course  of  Tenant's
business  is  materially  adversely  affected  (including,  without  limitation,  as  the  result  of  the  Premises  being
rendered  inaccessible  as  the  result  of  any  of  the  circumstances  described  in  subsections  (i),  (ii)  or  (iii)  above),
then, provided that Tenant ceases to use the affected portion of the Premises during the entirety of the Premises
Untenantability  Cure  Period  by  reason  of  such  untenantability,  and  that  such  untenantability  and  Landlord’s
inability to cure such condition is not caused by the fault or neglect of Tenant or Tenant’s agents, employees or
contractors,  Annual  Fixed  Rent,  Operating  Expenses  Allocable  to  the  Premises  and  Landlord’s  Tax  Expenses
Allocable  to  the  Premises  shall  thereafter  be  abated  after  the  expiration  of  the  Premises  Untenantability  Cure
Period in proportion to the impact on the continued operation in the ordinary course of Tenant’s business until the
day  such  condition  is  completely  corrected.  If  the  entire  Premises  have  not  been  rendered  untenantable,  the
amount of abatement shall be equitably prorated, provided, however, if the remaining portion of the Premises is
not reasonably sufficient to permit Tenant to effectively conduct its business therein (and Tenant was occupying
and  conducting  business  in  the  unaffected  portion  of  the  Premises  immediately  prior  to  the  event  or  condition),
and Tenant does not conduct its business in any portion of the Premises due to such event or condition, then such
abatement shall include such other portions of the Premises which Tenant is not able to and does not in fact use for
the  conduct  of  its  business.  For  the  purposes  hereof,  the  “Premises  Untenantability  Cure  Period”  shall  be
defined as ten (10)

consecutive  business  days  after  Landlord’s  receipt  of  written  notice  from  Tenant  of  the  condition  causing
untenantability in the Premises, provided however, that the Premises Untenantability Cure Period shall be fifteen
(15) consecutive business  days  after  Landlord’s  receipt  of  written  notice  from Tenant of such condition causing
untenantability in the Premises if either the condition was caused by causes beyond Landlord’s control or Landlord
is unable to cure such condition as the result of causes beyond Landlord’s control. Notwithstanding the foregoing,
Landlord  shall  promptly  commence  to  effect  the  repair  or  restoration  of  the  affected  portion  of  the  Premises  as
soon as reasonably possible following the event giving rise to a remedy hereunder (or, if the repair or restoration is
not within Landlord’s reasonable control, take such measures as are reasonably practicable to effect such repair or
restoration).

D.

Notwithstanding anything to the contrary herein contained, if due to (i) any repairs, alterations, replacements, or
improvements  made  by  Landlord,  (ii)  Landlord's  failure  to  make  any  repairs,  alterations,  or  improvements
required  to  be  made  by  Landlord  hereunder,  or  to  provide  any  service  required  to  be  provided  by  Landlord
hereunder,  or  (iii)  the  failure  or  inadequacy  of  electric  supply,  water  and/or  sewer  service,  all  elevator  service,
HVAC  service  or  all  access  to  the  Premises,  any  material  portion  of  the  Premises  becomes  untenantable  for  a
period (“Untenantability Period”) of twelve (12) months, such twelve (12) period shall be extended by the period
of time (which shall not exceed an additional one (1) month, that Landlord is delayed in curing such condition as
the result Force Majeure) after Landlord’s receipt of written notice of such condition from Tenant, then, provided
that Tenant ceases to use the affected portion of the Premises during the entire period of such untenantability, and
Landlord's  inability  to  cure  such  condition  is  not  caused  the  fault  or  neglect  of  Tenant,  or  Tenant's  agents,
employees or contractors, then Tenant may terminate this Lease by giving Landlord written notice as follows:

(1) Said notice shall be given after the expiration of the Untenantability Period.

(2) Said notice shall set forth an effective date which is not earlier than thirty (30) days after Landlord receives

said notice.

(3) If said condition is remedied on or before said effective date, said notice shall have no further force and effect.

(4) If said condition is not remedied on or before said effective date for any reason other than Tenant's fault, as

aforesaid, the Lease shall terminate as of said effective date, and the Annual Fixed Rent and

Additional Rent due under the Lease shall be apportioned as of said effective date.

(E)  The  provisions  of  Sections  7.7(C)  and  (D)  above  shall  not  apply  in  the  event  of  untenantability  or  inaccessibility
caused  by  fire  or  other  casualty,  or  taking  (which  shall  be  subject  to  the  terms  and  conditions  of  Article  XIV
below). Nothing contained in this Section 7.7 shall be construed so as to preclude Tenant from exercising its self-
help  rights  under  Section  16.17(B)  below;  provided,  however,  that  notwithstanding  anything  contained  in  this
Section  7.7  to  the  contrary,  if  Tenant  so  exercises  its  rights  under  said  Section  16.17(B),  then  any  abatement  of
Annual Fixed Rent and Additional Rent shall cease from and after the date that the untenantable condition in the
Premises would have been eliminated by the exercise of reasonable diligence, but for Tenant's exercise of its rights
under Section 16.17(B), taking into account any period of time which Tenant is delayed by Force Majeure.

ARTICLE VIII.

Tenant’s Repairs

8.1 Tenant’s Repairs and Maintenance

Tenant covenants and agrees that, from and after the date that possession of the Premises is delivered to Tenant and until
the end of the Lease Term, Tenant will keep neat and clean and maintain in good order, condition and repair the Premises
and every part thereof, excepting only reasonable wear and tear of the Premises and those repairs for which Landlord is
responsible  under  the  terms  of  Article VII  of  this  Lease  and,  subject  to  Tenant’s  obligations  under  Article  XIV  of  this
Lease, damage by fire or casualty and as a consequence of the exercise of the power of eminent domain. Tenant shall not
permit or commit any waste, and, subject to Section 13.13, Tenant shall be responsible for the cost of repairs which may
be  made  necessary  by  reason  of  damages  to  common  areas  in  the  Building  by  Tenant,  Tenant’s  agents,  employees,
contractors,  sublessees,  licensees,  concessionaires  or  invitees.  Tenant  shall  maintain  all  its  equipment,  furniture  and
furnishings in good order and repair. Subject to the foregoing, Tenant shall be responsible for all repairs, maintenance and
replacement of all systems and facilities located within or exclusively serving the Premises (e.g., Tenant’s distribution of
electricity, sprinkler and HVAC facilities within the Premises or elsewhere in the Building including the roof installed as
part of the Tenant’s Work or otherwise by or on behalf of Tenant, in each case as distinguished from the Base Building
Work). Notwithstanding any provision to the contrary, Tenant’s obligations under this Section shall not include making
any repair or improvement (y) to the extent necessitated by the negligence or willful conduct of Landlord or any Landlord
Party that is not covered by the insurance required to be carried by Tenant under this Lease, or (z) to the extent caused by
Landlord’s failure to perform its obligations

hereunder. Notwithstanding anything to the contrary set forth in this Lease, including in Section 13.13, Tenant shall be
responsible  to  pay  for  the  repair  of  any  damage  to  the  slab  floor  and/or  foundation  resulting  from  the  acts,  omissions,
negligence or willful misconduct of any Tenant Parties in the Premises.

If repairs are required to be made by Tenant pursuant to the terms hereof, Landlord may demand that Tenant make the
same  forthwith,  and  if  Tenant  refuses  or  neglects  to  commence  such  repairs  and  complete  the  same  with  reasonable
dispatch after such demand, Landlord may (but shall not be required to do so) make or cause such repairs to be made and
shall not be responsible to Tenant for any loss or damage that may accrue to Tenant’s stock or business by reason thereof.
If  Landlord  makes  or  causes  such  repairs  to  be  made,  Tenant  agrees  that  Tenant  will  forthwith  on  demand,  pay  to
Landlord as Additional Rent the cost thereof together with interest thereon at the rate specified in Section 16.21, and if
Tenant shall default in such payment, Landlord shall have the remedies provided for non-payment of rent or other charges
payable hereunder.

9.1 Landlord’s Approval

ARTICLE IX.

Alterations

A.

Tenant covenants and agrees not to make alterations, additions or improvements to the Premises (“Alterations”),
whether  before  or  during  the  Lease  Term,  except  in  accordance  with  plans  and  specifications  therefor  first
approved  by  Landlord  in  writing,  which  approval  shall  not  be  unreasonably  withheld  or  delayed.  However,
Landlord’s determination of matters relating to aesthetic issues relating to Alterations which are visible outside the
Premises  shall  be  in  Landlord’s  sole  discretion.  Without  limiting  such  standard,  Landlord  shall  not  be  deemed
unreasonable  for  withholding  approval  of  any  Alterations  (including,  without  limitation,  any  Alterations  to  be
performed  by  Tenant  under  Article  III)  which  (i)  in  Landlord’s  opinion  might  adversely  affect  any  structural  or
exterior  element  of  the  Building,  any  area  or  element  outside  of  the  Premises  or  any  facility  or  base  building
mechanical system serving any area of the Building outside of the Premises, or (ii) involve or affect the exterior
design, size, height or other exterior dimensions of the Building, or (iii) enlarge the Rentable Floor Area of the
Premises, or (iv) violate any restrictions or requirements with respect to the Historic Tax Credits or other matters
of record, or (v) will require unusual expense to readapt the Premises to normal office use on Lease termination
(Landlord  hereby  agreeing  that  it  will  not  withhold  its  consent  to  the  installation  of  internal  staircases  on  the
grounds that the same require unusual expense to readapt, provided that Landlord may nonetheless withhold such
approval  on  other  grounds  or  condition  approval  on  the  Premises  being  restored  at  the  end  of  the  Term  to  its
condition prior to the installation of such

B.

C.

internal staircases) or increase the cost of construction of or insurance or taxes on the Building or of the services
called for by Section 7.3 unless Tenant first gives assurance acceptable to Landlord for payment of such increased
cost  and  that  such  re(cid:0)adaptation  will  be  made  prior  to  such  termination  without  expense  to  Landlord  (the
foregoing Alterations described in subclauses (i) through (v) being sometimes collectively referred to as “Special
Improvements”).

In  the  case  of  all  Alterations,  Tenant  shall,  subject  to  Section  9.7,  deliver  reasonably  detailed  plans  and
specifications to Landlord at the time Tenant seeks Landlord’s approval. All Alterations shall become a part of the
Building  upon  the  expiration  or  earlier  termination  of  this  Lease  unless  Landlord  shall  specify  the  same  for
removal at the time consent is given by Landlord as hereinafter set forth, as “Required Removables.” If  Tenant
shall make any Alterations that are considered Required Removables (as hereinafter defined), then Landlord may
elect, provided Landlord so elects at the time Tenant requests Landlord’s consent to such Alterations, to require
Tenant at the expiration or sooner termination of the Term of this Lease to remove such Alterations and restore the
Premises to substantially the same condition as existed prior to the installation of such Required Removables. For
the  purposes  hereof,  “Required  Removables”  shall  mean  include,  without  limitation,  data  centers,  non-core
restrooms  (and  any  horizontal  plumbing  lines  associated  with  such  restrooms),  locker  rooms,  installed  by  or  on
behalf of Tenant (other than as part of Landlord’s Work) any Special Improvements, and any specific Alterations
identified by Landlord as a Required Removable in connection with Landlord’s approval of Tenant’s Plans.

Landlord shall use reasonable efforts to respond to any request from Tenant for its consent to Alterations within
ten (10) business days after receipt of the plans and specifications from Tenant (excluding any of Tenant’s Plans
(as defined in Exhibit B-1) submitted pursuant to the Work Agreement attached hereto as Exhibit B-1 which shall
be governed by the terms of such Work Agreement), or such longer period in the event of any structural alterations
that Landlord requires be reviewed by a third party consultant. If Landlord does not respond to Tenant within such
ten  (10)  business  day  period  following  receipt  of  Tenant’s  request  and  submission  of  complete  plans  and
specifications  as  required  under  this  Section  9.1,  Tenant  may  deliver  a  second  notice  (a  “Deemed  Approval
Notice”) to Landlord that indicates in bold, capitalized text that “THIS IS A TIME SENSITIVE NOTICE AND
LANDLORD  SHALL  BE  DEEMED  TO  CONSENT  TO  THE  PROPOSED  ALTERATION  IF  IT  FAILS
TO  RESPOND  TO  THIS  SECOND  REQUEST  FOR  CONSENT  WITHIN  FIVE  (5)  BUSINESS  DAYS
AFTER RECEIPT,” and if Landlord fails to respond within five (5) business days after delivery of such notice,
then Landlord’s failure to respond to the proposed Alterations shall be deemed to be an approval by Landlord of

the proposed Alterations. Landlord’s review and approval of any such plans and specifications under this Section
9.1 or under Exhibit B(cid:0)1 and consent to perform work described therein shall not be deemed an agreement by
Landlord that such plans, specifications and work conform with applicable Legal Requirements and requirements
of insurers of the Building and the other requirements of the Lease with respect to Tenant’s insurance obligations
(herein called “Insurance  Requirements”)  nor  deemed  a  waiver  of  Tenant’s  obligations  under  this  Lease  with
respect to applicable Legal Requirements and Insurance Requirements nor impose any liability or obligation upon
Landlord  with  respect  to  the  completeness,  design  sufficiency  or  compliance  of  such  plans,  specifications  and
work with applicable Legal Requirements and Insurance Requirements. Further, Tenant acknowledges that Tenant
is acting for its own benefit and account, and that Tenant shall not be acting as Landlord’s agent in performing any
work  in  the  Premises,  accordingly,  no  contractor,  subcontractor  or  supplier  shall  have  a  right  to  lien  Landlord’s
interest in the Building in connection with any such work. Within thirty (30) days after receipt of an invoice from
Landlord, Tenant shall pay to Landlord, as a fee for Landlord’s review of any plans or work (excluding any review
respecting initial improvements performed pursuant to Exhibit B(cid:0)1 for which a fee had previously been paid but
including any review of plans or work relating to any assignment or subletting), as Additional Rent, an amount
equal  to  the  sum  of:  (i)  $150.00  per  hour  for  time  reasonably  required  by  Landlord’s  in-house  personnel  to
perform such review (not to exceed $1,500 for any project involving interior, non-structural Alterations that do not
impact any Building Systems), plus (ii) if Landlord reasonably determines that a third-party consultant is needed
to  review  such  work  or  plans,  the  reasonable  third  party  expenses  incurred  by  Landlord  for  such  third  party  to
review Tenant’s plans and Tenant’s work.

Upon  and  subject  to  the  terms  of  this  Article  IX  and  other  applicable  terms  and  conditions  of  this  Lease,  Tenant  may
construct internal staircases between floors within the Premises and Tenant shall have the right to select the location of
such internal staircases subject to Landlord’s approval which shall not be unreasonably withheld so long as the same shall
not adversely affect the structural integrity of the Building.

9.2 Conformity of Work

Tenant covenants and agrees that any Alterations or installations made by it to or upon the Premises shall be done in a
good and workmanlike manner and in compliance with all applicable Legal Requirements and Insurance Requirements
now or hereafter in force, that materials of first and otherwise good quality shall be employed therein, that the structure of
the Building shall not be endangered or impaired thereby and that the Premises shall not be diminished in value thereby.

9.3 Performance of Work, Governmental Permits and Insurance

All of Tenant’s Alterations and installation of furnishings shall be coordinated with any work being performed by or for
Landlord and in such manner as to maintain harmonious labor relations and not to damage the Building or interfere with
Building construction or operation and, except for installation of furnishings, shall be performed by Landlord’s general
contractor  or  by  contractors  or  workers  first  approved  by  Landlord,  such  approval  not  to  be  unreasonably  withheld,
conditioned,  or  delayed.  Except  for  work  by  Landlord’s  general  contractor,  Tenant  shall  procure  all  necessary
governmental  permits  before  making  any  repairs,  Alterations  or  installations.  Tenant  agrees  to  save  harmless  and
indemnify Landlord from any and all injury, loss, claims or damage to any person or property occasioned by or arising out
of  the  doing  of  any  such  work  whether  the  same  be  performed  prior  to  or  during  the  Term  of  this  Lease  except  to  the
extent  resulting  from  the  negligence  or  willful  misconduct  of  Landlord  or  any  Landlord  Party.  Tenant  shall  cause  each
contractor to carry insurance in accordance with Section 13.14 hereof and to deliver to Landlord certificates of all such
insurance. Tenant  shall  also  prepare  and  submit  to  Landlord  a  set  of  as-built  plans,  in  both  print  and  electronic  forms,
showing  such  work  performed  by  Tenant  to  the  Premises  promptly  after  any  such  Alterations  or  installations  are
substantially  complete  and  promptly  after  any  wiring  or  cabling  for  Tenant’s  computer,  telephone  and  other
communications  systems  is  installed  by  Tenant  or  Tenant’s  contractor,  provided,  however,  that  if  the  work  is  not  of  a
nature where as-built plans would customarily be prepared, Tenant shall only be required to prepare and submit the type
of plans that would customarily be prepared in connection with such work. Without limiting any of Tenant’s obligations
hereunder, Tenant shall be responsible, as Additional Rent, for the costs of any alterations, additions or improvements in
or to the Building that are required in order to comply with Legal Requirements as a result of any work performed by
Tenant.  Landlord  shall  have  the  right  to  provide  rules  and  regulations  relative  to  the  performance  of  any  alterations,
additions,  improvements  and  installations  by  Tenant  hereunder  and  Tenant  shall  abide  by  all  such  reasonable  rules  and
regulations and shall cause all of its contractors to so abide including, without limitation, payment for the costs of using
Building  services.  Tenant  acknowledges  and  agrees  that  Landlord  shall  be  the  owner  of  any  additions,  alterations  and
improvements in the Premises or the Building to the extent paid for by Landlord.

9.4 Liens

Tenant covenants and agrees to pay promptly when due the entire cost of any work done on the Premises by Tenant, its
agents, employees or contractors, and not to cause or permit any liens for labor or materials performed or furnished in
connection therewith to attach to the Premises or the Building and to discharge any such liens (by bonding, discharge by
lienor, or otherwise) which may so attach within twenty (20) days after the earlier of notice from Landlord or Tenant’s
knowledge of such lien filing.

9.5 Nature of Alterations

All work, construction, repairs, Alterations or installations made to or upon the Premises (including, but not limited to, the
construction performed by Landlord under Article IV), shall become part of the Premises and shall become the property
of  Landlord  and  remain  upon  and  be  surrendered  with  the  Premises  as  a  part  thereof  upon  the  expiration  or  earlier
termination of the Lease Term, except as follows:

a.

b.

c.

All trade fixtures whether by law deemed to be a part of the realty or not, installed at any time or times by Tenant
or any person claiming under Tenant shall remain the property of Tenant or persons claiming under Tenant and
may be removed by Tenant or any person claiming under Tenant at any time or times during the Lease Term or
any occupancy by Tenant thereafter and shall be removed by Tenant at the expiration or earlier termination of the
Lease  Term  if  so  requested  by  Landlord.  Tenant  shall  repair  any  damage  to  the  Premises  occasioned  by  the
removal by Tenant or any person claiming under Tenant of any such property from the Premises.

At  the  expiration  or  earlier  termination  of  the  Lease  Term,  Tenant  shall  remove  all  Required  Removables  (as
defined  in  Section  9.1)  and,  to  the  extent  specified  for  removal  by  Landlord  at  the  time  Landlord  approves  the
same  under  Article  III  above  or  Section  9.1,  all  other  alterations,  additions  and  improvements  made  with
Landlord’s consent during the Lease Term for which such removal was made a condition of such consent under
Section 9.1. Upon such removal Tenant shall repair any damage caused by such removal and restore the Premises
and other affected areas of the Building and leave them neat and clean.

If Tenant shall make any Alterations to the Premises for which Landlord’s approval is required under Section 9.1
without obtaining such approval, then at Landlord’s request at any time during the Lease Term, and at any event at
the  expiration  or  earlier  termination  of  the  Lease  Term,  Tenant  shall  remove  such  Alterations  and  restore  the
Premises  to  their  condition  prior  to  same  and  repair  any  damage  occasioned  by  such  removal  and  restoration.
Nothing  herein  shall  be  deemed  to  be  a  consent  to  Tenant  to  make  any  such  alterations,  additions  or
improvements, the provisions of Section 9.1 being applicable to any such work.

9.6 Increases in Taxes

Tenant  shall  pay,  as  Additional  Rent,  one  hundred  percent  (100%)  of  any  increase  in  real  estate  taxes  on  the  Building
which  shall,  at  any  time  after  the  Commencement  Date,  result  from  Alterations  to  the  Premises  made  by  Tenant  if  the
taxing authority specifically determines such increase results from such Alterations made by Tenant.

9.7 Alterations Permitted Without Landlord’s Consent

Notwithstanding the terms of Section 9.1, Tenant shall have the right, without obtaining the prior consent of Landlord but
upon  notice  to  Landlord  given  ten  (10)  days  prior  to  the  commencement  of  any  work  (which  notice  shall  specify  the
nature of the work and specify the nature of the Alterations in reasonable detail), to make cosmetic type Alterations to the
Premises where:

(i)  the  same  are  within  the  interior  of  the  Premises  within  the  Building,  and  do  not  affect  the  exterior  of  the
Premises and the Building nor are visible from outside the Building;

(ii) the same do not affect the roof or any structural element of the Building and do not materially, adversely affect
the  mechanical,  electrical,  plumbing,  heating,  ventilating,  air-conditioning  and/or  fire  protection  systems  of  the
Building;

(iii) such Alterations do not require the issuance of a building permit by the appropriate municipal authority; and

(iv) Tenant shall comply with the provisions of this Lease and if such work increases the cost of insurance or taxes
or of services, Tenant shall pay for any such increase in cost.

provided, however, that Tenant shall, no later than ten (10) days after the making of such changes, send to Landlord plans
and specifications describing the same in reasonable detail and provided further that Landlord may, by notice to Tenant
given  no  later  than  thirty  (30)  days  subsequent  to  the  date  on  which  the  plans  and  specifications  are  submitted  to
Landlord, require Tenant to restore the Premises to its condition prior to such alteration, addition or improvement upon
the expiration or earlier termination of the Lease Term.

ARTICLE X.

Parking

10.1 Parking Privileges

Landlord agrees to designate sixty two (62) unreserved parking spaces at 61 and 75 North Beacon Street as visitor parking
spaces for use in common by visitors to the Building for the first two (2) Lease Years. Commencing on the first day of the
third Lease Year, Landlord agrees to designate forty two (42) unreserved parking spaces at 61 North Beacon Street and
shall address future opportunities for parking at 75 North Beacon Street on at at-will basis at the then current market rate.
In the event additional spaces are desired, the same may be made available at the then-current market rate (as of the date
of this Lease, $150 per month per space). Landlord shall not be obligated to police the use of such spaces, which Tenant
recognizes are to be operated on a self-parking basis. Unless otherwise determined by Landlord, the

parking areas at 61 and 75 North Beacon Street will be operated on a self-parking basis, and Tenant shall be obligated to
park  and  remove  its  own  automobiles.  Tenant’s  access  and  use  privileges  with  respect  to  the  parking  areas  shall  be  in
accordance with regulations of uniform applicability to the office users of the parking areas from time to time established
by  the  Landlord.  The  parking  privileges  granted  herein  are  non-transferable  (other  than  to  a  permitted  assignee  or
subtenant pursuant to  the  applicable  provisions  of  Article  XII  hereof). Landlord  reserves  for  itself  the  right  to  alter  the
parking  areas  as  it  sees  fit  and  in  such  case  to  change  the  parking  areas  including  the  reduction  in  area  of  the  same
provided that Tenant shall have use of the number of spaces designated above. In the event that the Rentable Floor Area
of the Premises decreases at any time during the Lease Term, the number of parking spaces provided to Tenant hereunder
shall be reduced proportionately in accordance with such reduction in the Rentable Floor Area of the Premises.

10.2 Parking Operations

Except for (a) normal and reasonable wear and use and (b) damage caused by fire or casualty and by eminent domain,
Landlord shall, throughout the Lease Term, subject to provisions for reimbursement by Tenant as contained in Section 7.4
and Section 7.5, keep and maintain, or cause to be kept and maintained, the parking area in good condition and repair, in
compliance  with  all  applicable  Legal  Requirements,  and  in  a  manner  consistent  with  surface  parking  areas  in  similar
office buildings in the Market Area, except that Landlord shall in no event be responsible to Tenant for any condition in
the parking area caused by any act or neglect of Tenant or any agent, employee, contractor, assignee, subtenant, licensee,
concessionaire or invitee of Tenant and which is not covered by the insurance maintained or required to be maintained by
Landlord pursuant to Section 13.12 of this Lease.

Tenant  shall  have  access  to  the  parking  area  twenty-four  (24)  hours  per  day,  seven  (7)  days  per  week,  subject  to
reasonable security restrictions and emergency conditions.

10.3 Limitations

Tenant  covenants  and  agrees  that  it  and  all  persons  claiming  by,  through  and  under  it,  shall  at  all  times  abide  by  all
reasonable rules and regulations promulgated by Landlord with respect to the use of the parking areas (which may include
vehicle  stickers  and/or  access  card  programs),  provided  such  rules  and  regulations  are  not  inconsistent  with  Tenant’s
rights under this Lease and are of general applicability to the occupants of the Building. The parking privileges granted
herein  are  non-transferable  except  to  a  permitted  assignee  or  subtenant  as  provided  in  Article  XII.  Further,  Landlord
assumes no responsibility whatsoever for loss or damage due to fire, theft or otherwise to any automobile(s) parked at the
property  or  to  any  personal  property  therein,  however  caused,  and  Tenant  covenants  and  agrees,  upon  request  from
Landlord  from  time  to  time,  to  notify  its  officers,  employees,  agents  and  invitees  of  such  limitation  of  liability.  Tenant
acknowledges and agrees that a license only is hereby granted, and no bailment is intended or shall be created.

ARTICLE XI.

Certain Tenant Covenants

Tenant covenants and agrees to the following during the Lease Term and for such further time as Tenant occupies any part
of the Premises:

11.1 To pay when due all Annual Fixed Rent and Additional Rent and all charges for utility services rendered to the Premises
and, as further Additional Rent, all charges for additional and special services requested by Tenant and rendered pursuant
to Section 7.3. In the event Tenant pays any utilities for the Premises directly to the utility company or provider, Tenant
shall grant Landlord access to Tenant’s account with such utility company or provider so that Landlord can review the
utility bills relating to the Premises.

11.2 (A) To use and occupy the Premises for the Permitted Use only, and not to injure or deface the Premises or the Building and
not to permit in the Premises any auction sale, or flammable fluids or chemicals, or nuisance, or the emission from
the Premises of any objectionable noise or odor, nor to operate in the Premises in such a way as to result in the
leakage of fluid or the growth of mold, and not to use or devote the Premises or any part thereof for any purpose
other than the Permitted Use, or which is improper, offensive, contrary to law or ordinance or liable to invalidate
or  increase  the  premiums  for  any  insurance  on  the  Building  or  its  contents  or  liable  to  render  necessary  any
alteration or addition to the Building.

(B) Tenant shall not cause or permit any substance which is or may hereafter be classified as a hazardous material, waste
or  substance  (collectively  “Hazardous  Materials”),  under  federal,  state  or  local  laws,  rules  and  regulations  or
standards, including, without limitation, 42 U.S.C. Section 6901 et seq., 42 U.S.C. Section 9601 et seq., 42 U.S.C.
Section 2601 et seq., 49 U.S.C. Section 1802 et seq. and Massachusetts General Laws, Chapter 21E and the rules
and regulations or standards promulgated under any of the foregoing, as such laws, rules and regulations may be
amended from time to time (collectively “Hazardous Materials Laws”) to be brought upon, kept, used, stored,
handled, treated, generated in  or  about,  or  released  or  disposed  of  (into  the  sewage  or  waste  disposal  system  or
otherwise) from, the Premises or the Property in violation of applicable Hazardous Materials Laws by Tenant, its
agents,  employees,  contractors,  affiliates,  sublessees  or  invitees.  However,  notwithstanding  the  preceding
sentence,  Landlord  agrees  that  Tenant  may  use,  store  and  properly  dispose  of  commonly  available  household
cleaners and chemicals to maintain the Premises and Tenant’s routine office operations (such as printer toner and
copier  toner)  provided  that  Tenant  uses  such  substances  in  the  manner  which  they  are  normally  used  and  in
compliance with all applicable Hazardous Materials Laws.

(C) Any  handling,  treatment,  transportation,  storage,  disposal  or  use  of  Hazardous  Materials  by  Tenant  in  or  about  the
Premises or the Property and Tenant’s use of the Premises shall comply with all applicable Hazardous Materials
Laws.

(D) Tenant shall indemnify, defend upon demand with counsel reasonably acceptable to Landlord, and hold Landlord and
the  Landlord  Parties  (as  hereinafter  defined)  harmless  from  and  against,  any  liabilities,  losses  claims,  damages,
interest,  penalties,  fines,  attorneys’  fees,  experts’  fees,  court  costs,  remediation  costs,  and  other  expenses  which
result from the use, storage, handling, treatment, transportation, release, threat of release or disposal of Hazardous
Materials  in  or  about  the  Premises  or  the  Property  by  Tenant  or  Tenant’s  agents,  employees,  contractors  or
invitees. The provisions of this paragraph (D) shall survive the expiration or earlier termination of this Lease.

(E)  Tenant  shall  give  written  notice  to  Landlord  as  soon  as  reasonably  practicable  of  any  communication  received  by
Tenant from any governmental authority alleging the release of Hazardous Materials which relates to the Premises
or the Property, and any Environmental Condition of which Tenant is aware.

(F) Tenant hereby represents and warrants to Landlord that Tenant is not subject to any enforcement order issued by any
governmental authority in connection with the use, storage, handling, treatment, generation, release or disposal of
Hazardous Materials (including, without limitation, any order related to the failure to make a required reporting to
any governmental authority).

(G) Tenant's obligations under this Section 11.2 shall survive the expiration or earlier termination of the Lease. Without
limitation of Landlord’s other remedies under this Lease, during any period of time after the expiration or earlier
termination  of  this  Lease  required  by  Tenant  or  Landlord  to  complete  the  removal  from  the  Premises  of  any
Hazardous  Materials  (including,  without  limitation,  the  release  and  termination  of  any  licenses  or  permits
restricting the use of the Premises) or to satisfy Tenant’s obligations under Section 11.2(M) below, Tenant shall
continue to pay the full Rent in accordance with this Lease for any portion of the Premises not relet by Landlord in
Landlord's sole discretion, which Rent shall be prorated daily

11.3  Not  to  obstruct  in  any  manner  any  portion  of  the  Building  not  hereby  leased  or  any  portion  thereof  used  by  Tenant  in
common with others; not without prior consent of Landlord to permit the painting or placing of any signs, curtains, blinds,
shades,  awnings,  aerials  or  flagpoles,  or  the  like,  visible  from  outside  the  Premises;  and  to  comply  with  all  reasonable
rules and regulations now or hereafter made by Landlord, of which Tenant has been given notice, for the care and use of
the Building and its facilities and approaches, but Landlord shall not be liable to Tenant for the failure of other occupants
of the Building to conform to such rules and regulations.

11.4  Subject  to  the  provisions  of  Section  8.1,  to  keep  the  Premises  equipped  with  all  safety  appliances  required  by  law  or
ordinance or any other regulation of any public authority because of any use made by Tenant other than normal office use,
and to procure all licenses and permits so required because of any use made by Tenant other than normal office use, and,
if  requested  by  Landlord,  to  do  any  work  so  required  because  of  such  use,  it  being  understood  that  the  foregoing
provisions shall not be construed to broaden in any way Tenant’s Permitted Use.

11.5  Not  to  place  a  load  upon  any  floor  in  the  Premises  exceeding  an  average  rate  of  100  pounds  of  live  load  (including  20
pounds allocated for partitions) per square foot of floor area; and not to move any safe, vault or other heavy equipment in,
about or out of the Premises except in such manner and at such time as Landlord shall in each instance authorize. Tenant’s
business machines and mechanical equipment shall be placed and maintained by Tenant at Tenant’s expense in settings
sufficient to absorb and prevent vibration or noise that may be transmitted to the Building structure or to any other space
in the Building.

11.6 To pay promptly when due all taxes which may be imposed upon personal property (including, without limitation, fixtures

and equipment) in the Premises to whomever assessed.

11.7 Intentionally omitted.

11.8 To comply with all applicable Legal Requirements now or hereafter in force regarding the operation of Tenant’s business or
which impose a duty on Landlord or Tenant relating to or as a result of the use or occupancy of the Premises; provided
that Tenant shall not be required to make any alterations or additions required by Legal Requirements to be made to the
structural elements of the Premises or to the structure, roof, exterior and load bearing walls, foundation, structural floor
slabs  and  other  structural  elements  of  the  Building  unless  such  alterations  or  additions  are  required  by  reason  of:  (x)
Tenant’s use of the Premises for other than general office use or Tenant’s particular manner of use or manner of operation
of Tenant’s business, or (y) alterations, additions, or improvements made by or on behalf of Tenant (exclusive of the Base
Building  Work).  Tenant  shall  obtain  and  maintain  all  permits,  licenses  and  the  like,  required  by  applicable  Legal
Requirements  (including  a  certificate  of  occupancy  following  performance  of  Tenant’s  Work)  in  respect  of  Tenant’s
business and Tenant’s use or occupancy of the Premises. Tenant, at its expense, after notice to Landlord, may contest, by
appropriate proceedings prosecuted diligently and in good faith, the validity, or applicability to the Premises, of any law
or  requirement  of  any  public  authority,  and  may  defer  compliance  therewith,  provided  that  (i)  Landlord  shall  not  be
subject to criminal penalty or to prosecution for a crime, or any other fine or charge, nor shall the Premises, or any part
thereof, or the Building, or any part thereof, be subjected to any lien (unless Tenant shall remove such lien by bonding or
otherwise)  or  encumbrance,  by  reason  of  non-compliance  or  otherwise  by  reason  of  such  contest;  (ii)  no  unsafe  or
hazardous condition remains unremedied and non-

performance  will  not  render  or  threaten  to  render  Landlord  or  Tenant  in  violation  of  any  statutory  repair  obligations
applicable  to  the  Premises  or  the  Building;  (iii)  such  non-compliance  or  contest  shall  not  constitute  or  result  in  any
violation of any mortgage or ground lease encumbering the Building, or if any such mortgage or ground lease shall permit
such  non-compliance  or  contest  on  condition  of  the  taking  of  action  or  furnishing  of  security  by  Landlord,  such  action
shall be taken and such security shall be furnished at the expense of Tenant; (iv) such non-compliance or contest shall not
prevent Landlord from obtaining any and all permits and licenses in connection with the operation of the Building or the
performance of the Base Building Work; and (v) Tenant shall keep Landlord advised as to the status of such proceedings.
Tenant shall promptly pay all fines, penalties and damages that may arise out of or be imposed because of its failure to
comply with the provisions of this Section 11.8. Tenant shall indemnify Landlord against the cost thereof and against all
liability for damages, interest, penalties and expenses (including reasonable attorneys’ fees and expenses), resulting from
or incurred in connection with such contest or non-compliance.

11.9 Intentionally Omitted.

11.10  Any  vendors  engaged  by  Tenant  to  perform  services  in  or  to  the  Premises  including,  without  limitation,  janitorial
contractors and moving contractors shall be coordinated with any work being performed by or for Landlord and in such
manner  as  to  maintain  harmonious  labor  relations  and  to  not  unreasonably  interfere  with  Building  construction  or
operation. If Landlord notifies Tenant that a vendor engaged by Tenant is causing or is likely to cause any labor disruption
or  disharmony  or  is  otherwise  interfering  with  Landlord’s  operation  of  the  Building,  Landlord  and  Tenant  agree  to
reasonably cooperate in good faith to promptly resolve any such disruption, disharmony or interference, as the case may
be, provided that if such disruption, disharmony or interference is not resolved within a time period reasonably designated
by Landlord, Tenant shall immediately dismiss such vendor. Tenant shall provide Landlord with reasonable prior notice of
the identification of any vendors performing services in or to the Premises and insurance certificates required pursuant to
Section 13.14 of this Lease. Any vendors performing work on behalf of Tenant in the Premises or the Building which,
under  applicable  Legal  Requirements,  requires  the  issuance  of  a  building  permit  shall  be  subject  to  Landlord’s  prior
written approval, which approval shall not be unreasonably withheld.

11.10 (A) As an inducement to Landlord to enter into this Lease, Tenant hereby represents and warrants that: (i) Tenant is not, nor
is  it  owned  or  controlled  directly  or  indirectly  by,  any  person,  group,  entity  or  nation  named  on  any  list  issued  by  the
Office of Foreign Assets Control of the United States Department of the Treasury (“OFAC”) pursuant to Executive Order
13224 or any similar list or any law, order, rule or regulation or any Executive Order of the President of the United States
as a terrorist, “Specially Designated National and Blocked Person” or other banned or blocked person (any such person,
group, entity or nation being hereinafter referred to

as a “Prohibited Person”);  (ii)  Tenant  is  not  (nor  is  it  owned,  controlled,  directly  or  indirectly,  by  any  person,  group,
entity or nation which is) acting directly or indirectly for or on behalf of any Prohibited Person; and (iii) from and after
the  effective  date  of  the  above-referenced  Executive  Order,  Tenant  (and  any  person,  group,  or  entity  which  Tenant
controls,  directly  or  indirectly)  has  not  conducted  nor  will  conduct  business  nor  has  engaged  nor  will  engage  in  any
transaction  or  dealing  with  any  Prohibited  Person  in  violation  of  the  U.S.  Patriot  Act  or  any  OFAC  rule  or  regulation,
including without limitation any assignment of this Lease or any subletting of all or any portion of the Premises or the
making or receiving of any contribution of funds, goods or services to or for the benefit of a Prohibited Person in violation
of the U.S. Patriot Act or any OFAC rule or regulation. In connection with the foregoing, it is expressly understood and
agreed that (x) any breach by Tenant of the foregoing representations and warranties shall be deemed an Event of Default
by Tenant under Section 15.1(d) of this Lease and shall be covered by the indemnity provisions of Section 13.1 below,
and (y) the representations and warranties contained in this subsection shall be continuing in nature and shall survive the
expiration or earlier termination of this Lease.

(B) As an inducement to Tenant to enter into this Lease, Landlord hereby represents and warrants that: (i) Landlord is not,
nor  is  it  owned  or  controlled  directly  or  indirectly  by,  any  Prohibited  Person;  (ii)  Landlord  is  not  (nor  is  it  owned  or
controlled, directly or indirectly, by any person, group, entity or nation which is) acting directly or indirectly for or on
behalf of any Prohibited Person; and (iii) Landlord (and any person, group, or entity which Landlord controls, directly or
indirectly) has not conducted nor will conduct business nor has engaged nor will engage in any transaction or dealing with
any  Prohibited  Person  that  either  causes  or  may  cause  Tenant  to  be  in  violation  of  any  OFAC  rule  or  regulation.  In
connection  with  the  foregoing,  is  expressly  understood  and  agreed  that  the  representations  and  warranties  contained  in
this subsection shall be continuing in nature and shall survive the expiration or earlier termination of this Lease.

12.1 Restrictions on Transfer

ARTICLE XII.

Assignment and Subletting

Except  as  otherwise  expressly  provided  herein,  Tenant  covenants  and  agrees  that  it  shall  not  assign,  mortgage,  pledge,
hypothecate  or  otherwise  transfer  this  Lease  and/or  Tenant’s  interest  in  this  Lease  or  sublet  (which  term,  without
limitation, shall include granting of concessions, licenses or the like) the whole or any part of the Premises. If and so long
as Tenant is a corporation with fewer than five hundred (500) shareholders or a limited liability company or a partnership,
an assignment, within the meaning of this Article XII, shall be deemed to include one or more sales or transfers of stock
or membership or partnership interests, by operation of law or

otherwise, or the issuance of new stock or membership or partnership interests, by which an aggregate of more than fifty
percent (50%) of Tenant’s stock or membership or partnership interests shall be vested in a party or parties who are not
stockholders or members or partners as of the date hereof, except that the transfer of the outstanding capital stock of or
equity interests in Tenant by persons or parties through the “over the counter market” or through any recognized stock
exchange shall not be deemed an assignment of this Lease. For the purpose of this Section 12.1, ownership of stock or
membership or partnership interests shall be determined in accordance with the principles set forth in Section 544 of the
Internal Revenue Code of 1986, as amended from time to time, or the corresponding provisions of any subsequent law. In
addition, the merger or consolidation of Tenant into or with any other entity, or the sale of all or substantially all of its
assets, shall be deemed to be an assignment within the meaning of this Article XII. Any assignment, mortgage, pledge,
hypothecation, transfer or subletting not expressly permitted in or consented to by Landlord under this Article XII shall, at
Landlord’s election, be void; shall be of no force and effect; and shall confer no rights on or in favor of third parties. In
addition, Landlord shall be entitled to seek specific performance of or other equitable relief with respect to the provisions
hereof. The limitations of this Section 12.1 shall be deemed to apply to any guarantor(s) of this Lease.

12.2 Tenant’s Notice

Notwithstanding  the  provisions  of  Section  12.1  above,  in  the  event  Tenant  desires  to  assign  this  Lease  or  to  sublet  the
Premises  (in  whole  or  in  part),  Tenant  shall  give  Landlord  notice  (the  “Proposed  Transfer  Notice”)  of  any  proposed
sublease or assignment, and said notice shall specify the provisions of the proposed assignment or subletting, including
(a)  the  name  and  address  of  the  proposed  assignee  or  subtenant,  (b)  in  the  case  of  a  proposed  assignment  pursuant  to
Section 12.4 below, such information as to the proposed assignee’s net worth and financial capability and standing as may
reasonably be required for Landlord to make the determination referred to in said Section 12.4 (provided, however, that
Landlord shall hold such information confidential having the right to release same to its officers, accountants, attorneys
and mortgage lenders on a confidential basis), (c) all of the terms and provisions upon which the proposed assignment or
subletting is to be made, (d) in the case of a proposed assignment or subletting pursuant to Section 12.4 below, all other
information  necessary  to  make  the  determination  referred  to  in  said  Section  12.4  and  (e)  in  the  case  of  a  proposed
assignment or subletting pursuant to Section 12.5 below, such information as may be reasonably required by Landlord to
determine that such proposed assignment or subletting complies with the requirements of said Section 12.5.

12.3 Landlord’s Termination Right

In the event Tenant desires to (a) assign this Lease, or (b) to sublet the Premises or any portion thereof for a term equal to
all or substantially all of the remaining Term

hereof  (any  such  sublease  being  hereinafter  referred  to  as  a  “Major  Sublease”)  to  an  entity  other  than  a  Permitted
Transferee (for which the terms of Section 12.5 shall control), Tenant shall give Landlord either (y) a Proposed Transfer
Notice  of  any  proposed  sublease  or  assignment  in  the  event  Tenant  already  has  a  specific  assignment  or  sublease
transaction or (z) a notice stating that Tenant is contemplating entering into an assignment or Major Sublease (either such
notice  being  hereinafter  referred  to  as  a  “Notice  of  Intent  to  Transfer”)  and  Landlord  shall  have  the  right  at  its  sole
option,  to  be  exercised  (1)  within  thirty  (30)  days  after  receipt  of  Tenant’s  Notice  of  Intent  to  Transfer,  or  (2)  within
fifteen (15) business days after receipt of Tenant’s Proposed Transfer Notice (such response time period, as applicable to
the type of notice received from Tenant, being referred to herein as the “Acceptance Period”), to terminate this Lease as
of a date specified in a notice to Tenant, which date shall be not earlier than thirty (30) days nor later than ninety (90) days
after Landlord’s notice to Tenant. In the event Landlord exercises such right of termination, Tenant may rescind Tenant’s
Notice of Intent to Transfer by delivering written notice thereof to Landlord within five (5) business days after Landlord’s
termination notice, in which case such Tenant’s Notice of Intent to Transfer shall be deemed rescinded and void and of no
further force and effect and Tenant shall not proceed with the proposed transfer. Upon the termination date as set forth in
Landlord’s  notice,  all  obligations  relating  to  the  period  after  such  termination  date  (but  not  those  relating  to  the  period
before such termination date) shall cease and promptly upon being billed therefor by Landlord, Tenant shall make final
payment of all Annual Fixed Rent and Additional Rent due from Tenant through the termination date.

In the event that Landlord shall not exercise its termination rights as aforesaid, or shall fail to give any or timely notice
pursuant to this Section, the provisions of Sections 12.4, 12.6 and 12.7 shall be applicable. This Section 12.3 shall not be
applicable to an assignment or sublease pursuant to Section 12.5. If Landlord fails to exercise its rights under this Lease
with respect to a Notice of Intent to Transfer within the Acceptance Period, Landlord will not thereafter have the right to
exercise  its  rights  under  this  Section  12.3  with  respect  to  a  Proposed  Transfer  Notice  for  any  portion  of  the  space
identified in Tenant’s previous Notice of Intent to Transfer provided Tenant’s Proposed Transfer Notice is received within
the  one  hundred  twenty  (120)  day  time  period  set  forth  in  Section  12.4  below,  and  provided  that  nothing  herein  shall
waive Tenant’s obligation to obtain Landlord’s prior written consent to such subsequent Tenant’s proposed transfer.

12.4 Consent of Landlord

Notwithstanding the provisions of Section 12.1 above, but subject to the provisions of this Section 12.4 and the provisions
of Sections 12.6 and 12.7 below, in the event that Landlord shall not have exercised the termination right as set forth in
Section 12.3, or shall have failed to give any or timely notice under Section 12.3, then for a period of one hundred twenty
(120) days after (i) the receipt of Landlord’s notice stating that

Landlord  does  not  elect  to  exercise  the  termination  right,  or  (ii)  the  expiration  of  the  Acceptance  Period,  in  the  event
Landlord shall not give any or timely notice under Section 12.3 as the case may be, Tenant shall have the right to assign
this Lease or sublet all or any portion of the of the Premises in accordance with the Proposed Transfer Notice provided
that,  in  each  instance,  Tenant  first  obtains  the  express  prior  written  consent  of  Landlord,  which  consent  shall  not  be
unreasonably withheld or delayed. Any disapproval by Landlord of a proposed assignment or subletting shall set forth in
reasonable detail the reason or reasons therefor.

Without limiting the foregoing standard, Landlord shall not be deemed to be unreasonably withholding its consent
to such a proposed assignment or subleasing if:

a.

b.

c.

d.

the proposed assignee or subtenant is a tenant in the Building or is (or within the previous sixty (60) days
has been) in active negotiation (meaning that Landlord has issued or received a lease proposal with such
party)  with  Landlord  or  an  affiliate  of  Landlord  for  premises  in  the  Building  or  is  not  of  a  character
consistent  with  the  operation  of  a  first  class  office  building  (by  way  of  example  Landlord  shall  not  be
deemed to be unreasonably withholding its consent to an assignment or subleasing to any governmental or
quasi(cid:0)governmental agency or to a so(cid:0)called “call center”). Notwithstanding  the  foregoing,  Tenant  may
sublease all or a portion of the Premises (the “Subleased Premises”)  to  a  tenant  of  the  Building  if  such
subtenant’s need, as to the size of premises and length of term, cannot then (i.e., at the time that Tenant’s
sublease would commence) be satisfied by Landlord or its affiliates within the Building; or

the proposed assignee does not possess adequate financial capability to perform the Tenant obligations as
and when due or required; or

the  assignee  or  subtenant  proposes  to  use  the  Premises  (or  part  thereof)  for  a  purpose  other  than  the
purpose for which the Premises may be used as stated in Section 1.2 hereof; or

the  character  of  the  business  to  be  conducted  or  the  proposed  use  of  the  Premises  by  the  proposed
subtenant or assignee shall (i) be likely to materially increase Landlord’s Operating Expenses beyond that
which Landlord now incurs for use by Tenant; (ii) be likely to materially increase the burden on elevators
or other Building systems or equipment over the burden generated by normal and customary office usage;
or (iii) violate or be likely to violate any provisions or restrictions contained herein relating to the use or
occupancy of the Premises; or

e.

f.

g.

h.

there shall be existing an Event of Default (defined in Section 15.1) or there have been two (2) or more
Event of Default occurrences within the twelve (12) months immediately preceding Landlord’s receipt of
Tenant’s Proposed Transfer Notice; or

any part of the rent payable under the proposed assignment or sublease shall be based in whole or in part
on  the  income  or  profits  derived  from  the  Premises  or  if  any  proposed  assignment  or  sublease  shall
potentially have any adverse effect on the real estate investment trust qualification requirements applicable
to Landlord and its affiliates; or

the  holder  of  any  mortgage  on  property  which  includes  the  Premises  having  approval  rights  over  such
proposed  assignment  or  sublease  does  not  approve  of  the  same  (where  such  holder  has  approval  rights
pursuant to the terms of the mortgage); or

due to the identity or business of a proposed assignee or subtenant, such approval would cause Landlord to
be in violation of any covenant or restriction contained in another lease for space within the Building.

If Landlord shall consent to the proposed assignment or subletting, as the case may be, then, in such event, Tenant may
thereafter sublease or assign pursuant to Tenant’s notice, as given hereunder; provided, however, that if such assignment
or sublease shall not be executed and delivered to Landlord within ninety (90) days after the date of Landlord’s consent,
the consent shall be deemed null and void and the provisions of Section 12.2 shall be applicable.

At the written request of Tenant, Landlord will approve or disapprove of a proposed transferee prior to receiving a final,
executed copy of the proposed assignment, sublease and other contractual documents, provided that (i) Landlord has been
provided with sufficient information to make such decision, and (ii) any approval by Landlord of a proposed transferee
shall be conditioned upon Landlord’s subsequent approval of the actual signed assignment, sublease or other contractual
documents that are entered into to effectuate the proposed Transfer. Notwithstanding the foregoing, Landlord’s approval
shall be null and void and deemed withdrawn if Tenant does not, within ninety (90) days of Tenant’s initial request for
Landlord’s approval, enter into an assignment or sublease upon substantially the same economic and other material terms
as were set forth in the documentation previously delivered to Landlord.

12.5 Exceptions

Notwithstanding the provisions of Sections 12.1, 12.3 and 12.4 above or the provisions of Section 12.6 below, but subject
to the provisions of Section 12.2 and Section 12.7 below, Tenant shall have the right to assign this Lease or to sublet the
Premises (in whole or in part) without the consent of Landlord but after reasonable

advance notice (not less than fifteen (15) days before the effective date of the assignment or subletting except that if prior
notice to Landlord of such assignment, sublease or transfer is prohibited by applicable securities laws, then Tenant shall
deliver such notice to Landlord as soon as it is legally permitted to do so, but not later than the date five (5) business days
after  the  occurrence  of  the  proposed  assignment,  sublease  or  transfer  in  question  and,  if  such  transfer  is  subject  to  a
confidentiality  agreement,  Tenant  may  require  Landlord  to  first  execute  a  commercially  reasonable  confidentiality
agreement) to any other entity (the “Successor Entity”) (i) which controls or is controlled by Tenant or Tenant’s parent
corporation,  or  (ii)  which  is  under  common  control  with  Tenant,  or  (iii)  which  purchases  all  or  substantially  all  of  the
assets of Tenant, or (iv) which purchases a controlling interest in Tenant, or (v) which merges or combines with Tenant
(the  foregoing  transferees  referred  to,  individually  or  collectively,  as  a  “Permitted  Transferee”).  Except  in  cases  of
statutory merger, in which case the surviving entity in the merger shall be liable as the Tenant under this Lease, Tenant
shall continue to remain fully liable under this Lease, on a joint and several basis with the Permitted Transferee. If any
parent, affiliate or subsidiary of Tenant to which this Lease is assigned or the Premises sublet (in whole or in part) shall
cease to be such a parent, affiliate or subsidiary, such cessation shall be considered an assignment or subletting requiring
Landlord’s consent.

12.6 Profit on Subleasing or Assignment

In the case of any assignment or subleasing as to which Landlord may consent (other than an assignment or subletting
permitted  under  Section  12.5  above)  such  consent  shall  be  upon  the  express  and  further  condition,  covenant  and
agreement, and Tenant hereby covenants and agrees that, in addition to the Annual Fixed Rent, Additional Rent and other
charges to be paid pursuant to this Lease, fifty percent (50%) of the “Assignment/Sublease Profits” (hereinafter defined),
if any, actually received by Tenant shall be paid to Landlord. The “Assignment/Sublease Profits” shall be the excess, if
any,  of  (a)  the  “Assignment/Sublease  Net  Revenues”  as  hereinafter  defined  over  (b)  the  Annual  Fixed  Rent  and
Additional  Rent  and  other  charges  provided  in  this  Lease  (provided,  however,  that  for  the  purpose  of  calculating  the
Assignment/Sublease  Profits  in  the  case  of  a  sublease,  appropriate  proportions  in  the  applicable  Annual  Fixed  Rent,
Additional Rent and other charges under this Lease shall be made based on the percentage of the Premises subleased and
on the terms of the sublease). The “Assignment/Sublease Net Revenues” shall be the fixed rent, additional rent and all
other charges and sums actually received by Tenant either initially or over the term of the sublease or assignment plus all
other profits and increases actually received by Tenant as a result of such subletting or assignment (exclusive of amounts
paid to Tenant for the purchase or lease of personal property or equipment of Tenant except to the extent such amounts
exceed the fair market value or rental value of the same), after deducting the reasonable costs of Tenant incurred in such
subleasing  or  assignment  (the  definition  of  which  shall  be  limited  to  rent  concessions,  architectural  fees,  reasonable
attorneys’  fees,  moving  expenses,  brokerage  commissions  and  alteration  allowances  associated  with  the  subleasing  or
assignment at issue, in each

case actually paid and, with respect to an assignment only, the unamortized costs of leasehold improvements paid for by
Tenant in excess of Landlord’s Contribution to the extent the assignee has paid consideration specifically on account of
the same), as set forth in a statement certified by an appropriate officer of Tenant and delivered to Landlord within thirty
(30)  days  of  the  full  execution  of  the  sublease  or  assignment  document,  amortized  over  the  term  of  the  sublease  or
assignment.

All payments of the Assignment/Sublease Profits due Landlord shall be made within ten (10) business days of receipt of
same by Tenant.

12.7 Additional Conditions

A.

It shall be a condition of the validity of any assignment or subletting consented to under Section 12.4 above, or
any  assignment  or  subletting  of  right  under  Section  12.5  above,  that  both  Tenant  and  the  assignee  or  sublessee
enter  into  a  separate  written  instrument  directly  with  Landlord  in  a  form  and  containing  terms  and  provisions
reasonably required by Landlord, including, without limitation, the agreement of the assignee or sublessee to be
bound directly to Landlord for all the obligations of the Tenant under this Lease (including any amendments or
extensions thereof), including, without limitation, the obligation (a) to pay the rent and other amounts provided for
under this Lease (but in the case of a partial subletting pursuant to Section 12.5, such subtenant shall agree on a
pro rata basis to be so bound) and (b) to comply with the provisions of Article XII hereof and (c) to indemnify the
“Landlord Parties” (as defined in Section 13.13) as provided in Section 13.1 hereof. Such assignment or subletting
shall  not  relieve  the  Tenant  named  herein  of  any  of  the  obligations  of  the  Tenant  hereunder  and  Tenant  shall
remain fully and primarily liable therefor and the liability of Tenant and such assignee (or subtenant, as the case
may  be)  shall  be  joint  and  several.  Further,  and  notwithstanding  the  foregoing,  the  provisions  hereof  shall  not
constitute a recognition of the sublease or the subtenant thereunder, as the case may be, and at Landlord’s option,
upon the termination or expiration of the Lease (whether such termination is based upon a cause beyond Tenant’s
control,  a  default  of  Tenant,  the  agreement  of  Tenant  and  Landlord  or  any  other  reason),  the  sublease  shall  be
terminated.

B.

As Additional Rent, Tenant shall pay to Landlord as a fee for Landlord’s review of any proposed assignment or
sublease requested by Tenant and the preparation of any associated documentation in connection therewith, within
thirty (30) days after receipt of an invoice from Landlord, an amount equal to the sum of (i) $2,500.00 and/or (ii)
reasonable out of pocket legal fees or other expenses incurred by Landlord in connection with such request up to a
maximum of Five Thousand and 00/100 Dollars ($5,000.00) in connection with any single request for consent.

C.

D.

E.

F.

G.

If this Lease be assigned, or if the Premises or any part thereof be sublet or occupied by anyone other than Tenant,
Landlord may upon prior notice to Tenant, at any time and from time to time, at any time and from time to time
after the occurrence of an Event of Default by Tenant, collect rent and other charges from the assignee, sublessee
or  occupant  and  apply  the  net  amount  collected  to  the  rent  and  other  charges  herein  reserved,  but  no  such
assignment,  subletting,  occupancy  or  collection  shall  be  deemed  a  waiver  of  this  covenant,  or  a  waiver  of  the
provisions of Article XII hereof, or the acceptance of the assignee, sublessee or occupant as a tenant or a release of
Tenant from the further performance by Tenant of covenants on the part of Tenant herein contained, the Tenant
herein named to remain primarily liable under this Lease.

The  consent  by  Landlord  to  an  assignment  or  subletting  under  Section  12.4  above,  or  the  consummation  of  an
assignment or subletting of right under Section 12.5 above, shall in no way be construed to relieve Tenant from
obtaining the express consent in writing of Landlord to any further assignment or subletting.

On or after the occurrence of a monetary or material non-monetary “Event of Default” (defined in Section 15.1),
Landlord shall be entitled to one hundred percent (100%) of any Assignment/Sublease Profits.

Without  limiting  Tenant’s  obligations  under  Article  IX  and  except  as  expressly  provided  in  Section  12.3  above,
Tenant shall be responsible, at Tenant’s sole cost and expense, for performing all work necessary to comply with
Legal  Requirements  and  Insurance  Requirements  in  connection  with  any  assignment  or  subletting  hereunder
including, without limitation, any work in connection with such assignment or subletting.

In addition to the other requirements set forth in this Lease and notwithstanding any other provision of this Lease,
partial sublettings of the Premises shall only be permitted under the following terms and conditions: (i) the layout
of  both  the  subleased  premises  and  the  remainder  of  the  Premises  must  comply  with  applicable  Legal
Requirements and any alterations must be approved by Landlord in accordance with Article IX, including, without
limitation, all requirements concerning access and egress; (ii) in the event the subleased premises are separately
physically  demised  from  the  remainder  of  the  Premises,  Tenant  shall  pay  all  costs  of  separately  physically
demising  the  subleased  premises  and  shall  restore  the  Premises  to  its  original  layout  prior  to  expiration  of  the
Term, including, without limitation, removing all demising walls, wiring and other improvements made; and (iii)
there shall be no more than one (1) sublease in effect in the Premises at any given time.

ARTICLE XIII.

13.1 Tenant’s Indemnity

Indemnity and Insurance

a.

b.

c.

Indemnity. To  the  fullest  extent  permitted  by  law,  but  subject  to  the  limitations  in  Section  13.13  of  this
Article (waiver of subrogation) and Section 16.24 below, Tenant waives any right to contribution against
the  Landlord  Parties  (as  hereinafter  defined)  and  agrees  to  indemnify  and  save  harmless  the  Landlord
Parties from and against claims of whatever nature by a third party arising from or claimed to have arisen
from  (i)  any  act,  omission  or  negligence  of  the  Tenant  Parties  (as  hereinafter  defined);  (ii)  any  accident,
injury or damage whatsoever caused to any person, or to the property of any person, occurring in or about
the Premises from the earlier of (A) the date on which any Tenant Party first enters the Premises for any
reason or (B) the Commencement Date, and thereafter throughout and until the end of the Lease Term, and
after the end of the Lease Term for so long after the end of the Lease Term as Tenant or anyone acting by,
through or under Tenant is in occupancy of the Premises or any portion thereof; (iii) any accident, injury or
damage whatsoever occurring outside the Premises but within the Building or the Common Areas where
such  accident,  injury  or  damage  results,  or  is  claimed  to  have  resulted,  from  any  act,  omission  or
negligence on the part of any of the Tenant Parties; or (iv) any breach of this Lease by Tenant. Tenant shall
pay such indemnified amounts as they are incurred by the Landlord Parties. This indemnification shall not
be construed to deny or reduce any other rights or obligations of indemnity that any of the Landlord Parties
may have under this Lease. Notwithstanding anything contained herein to the contrary, Tenant shall not be
obligated to indemnify a Landlord Party for any claims to the extent that such Landlord Party’s damages
result from the negligence or willful misconduct or breach of this Lease by any of the Landlord Parties.

No limitation. The indemnification obligations under this Section 13.1 shall not be limited in any way by
any limitation on the amount or type of damages, compensation or benefits payable by or for Tenant or any
subtenant or other occupant of the Premises under workers’ compensation acts, disability benefit acts, or
other  employee  benefit  acts.  Tenant  waives  any  immunity  from  or  limitation  on  its  indemnity  or
contribution liability to the Landlord Parties based upon such acts.

Subtenants and other occupants. Tenant shall require its subtenants and other occupants of the Premises to
provide similar indemnities to the Landlord Parties in a form acceptable to Landlord.

d.

e.

Survival. The terms of this Section 13.1 shall survive any termination or expiration of this Lease.

Costs.  The  foregoing  indemnity  and  hold  harmless  agreement  shall  include  indemnity  for  all  costs,
expenses and liabilities (including, without limitation, attorneys’ fees and disbursements) incurred by the
Landlord Parties in connection with any such claim or any action or proceeding brought thereon, and the
defense thereof. In addition, in the event that any action or proceeding shall be brought against one or more
Landlord Parties by reason of any such claim, Tenant, upon request from the Landlord Party, shall resist
and defend such action or proceeding on behalf of the Landlord Party by counsel appointed by Tenant’s
insurer  (if  such  claim  is  covered  by  insurance  without  reservation)  or  otherwise  by  counsel  reasonably
satisfactory  to  the  Landlord  Party.  The  Landlord  Parties  shall  not  be  bound  by  any  compromise  or
settlement  of  any  such  claim,  action  or  proceeding  without  the  prior  written  consent  of  such  Landlord
Parties.

13.2 Tenant’s Risk

Tenant agrees to use and occupy the Premises, and to use such other portions of the Building as Tenant is given the right
to use by this Lease at Tenant’s own risk. The Landlord Parties shall not be liable to the Tenant Parties for any damage,
injury, loss, compensation, or claim (including, but not limited to, claims for the interruption of or loss to a Tenant Party’s
business)  based  on,  arising  out  of  or  resulting  from  any  cause  whatsoever,  including,  but  not  limited  to,  repairs  to  any
portion of the Premises or the Building, any fire, robbery, theft, mysterious disappearance, or any other crime or casualty,
the actions of any other tenants of the Building or of any other person or persons, or any leakage in any part or portion of
the Premises or the Building, or from water, rain or snow that may leak into, or flow from any part of the Premises or the
Building, or from drains, pipes or plumbing fixtures in the Building. Any goods, property or personal effects stored or
placed  in  or  about  the  Premises  shall  be  at  the  sole  risk  of  the  Tenant  Party,  and  neither  the  Landlord  Parties  nor  their
insurers  shall  in  any  manner  be  held  responsible  therefor.  The  Landlord  Parties  shall  not  be  responsible  or  liable  to  a
Tenant Party, or to those claiming by, through or under a Tenant Party, for any loss or damage that may be occasioned by
or  through  the  acts  or  omissions  of  persons  occupying  adjoining  premises  or  any  part  of  the  premises  adjacent  to  or
connecting with the Premises or any part of the Building or otherwise. The provisions of this section shall be applicable to
the  fullest  extent  permitted  by  law,  and  until  the  expiration  or  earlier  termination  of  the  Lease  Term,  and  during  such
further period as Tenant may use or be in occupancy of any part of the Premises or of the Building.

13.3 Tenant’s Commercial General Liability Insurance

Tenant agrees to maintain in full force on or before the earlier of (i) the date on which any Tenant Party first enters the
Premises for any reason or (ii) the Commencement Date, and thereafter throughout and until the end of the Lease Term,
and after the end of the Lease Term for so long as Tenant or anyone acting by, through or under Tenant is in occupancy of
the Premises or any portion thereof, a policy of commercial general liability insurance, on an occurrence basis, issued on a
form at least as broad as Insurance Services Office (“ISO”) Commercial General Liability Coverage “occurrence” form
CG  00  01  10  01  or  another  Commercial  General  Liability  “occurrence”  form  providing  equivalent  coverage.  Such
insurance  shall  include  contractual  liability  coverage,  specifically  covering  but  not  limited  to  the  indemnification
obligations undertaken by Tenant in this Lease (exclusive of Tenant’s indemnification for a breach of this Lease by Tenant
pursuant to clause (iv) of Section 13.1). The minimum limits of liability of such insurance shall be Five Million Dollars
($5,000,000.00) per occurrence, which may be satisfied through a combination of primary and excess/umbrella insurance.
In  addition,  in  the  event  Tenant  hosts  a  function  in  the  Premises,  in  the  Building  or  on  the  Property,  Tenant  agrees  to
obtain,  and  cause  any  persons  or  parties  providing  services  for  such  function  to  obtain,  the  appropriate  insurance
coverages  as  determined  by  Landlord  (including  liquor  liability  coverage,  if  applicable)  and  provide  Landlord  with
evidence of the same.

13.4 Tenant’s Property Insurance

Tenant shall maintain at all times during the Term of the Lease, and during such earlier time as Tenant may be performing
work  in  or  to  the  Premises  or  have  property,  fixtures,  furniture,  equipment,  machinery,  goods,  supplies,  wares  or
merchandise  on  the  Premises,  and  containing  thereafter  so  long  as  Tenant  is  in  occupancy  of  any  part  of  the  Premises,
business interruption insurance and insurance against loss or damage covered by the so called “all risk” type insurance
coverage  with  respect  to  Tenant’s  property,  fixtures,  furniture,  equipment,  machinery,  goods,  supplies,  wares  and
merchandise,  and  all  alterations,  improvements  and  other  modifications  made  by  or  on  behalf  of  the  Tenant  in  the
Premises,  and  other  property  of  Tenant  located  at  the  Premises,  which  are  permitted  to  be  removed  by  Tenant  at  the
expiration  or  earlier  termination  of  the  Lease  Term  except  to  the  extent  paid  for  by  Landlord  (collectively  “Tenant’s
Property”).  The  business  interruption  insurance  required  by  this  Section  13.4  shall  be  in  minimum  amounts  typically
carried by prudent tenants engaged in similar operations, but in no event shall be in an amount less than the Annual Fixed
Rent then in effect during any Lease Year, plus any Additional Rent due and payable for the immediately preceding Lease
Year. The “all risk” insurance required by this section shall be in an amount at least equal to the full replacement cost of
Tenant’s Property. In addition, during such time as Tenant is performing work in or to the Premises, Tenant, at Tenant’s
expense,  shall  also  maintain,  or  shall  cause  its  contractor(s)  to  maintain,  builder’s  risk  insurance  for  the  full  insurable
value of such work. Landlord and such additional persons or entities as Landlord may reasonably request shall be named
as loss payees, as their interests may appear, on the

policy or policies required by this Lease. In the event of loss or damage covered by the “all risk” insurance required by
this  Lease,  the  responsibilities  for  repairing  or  restoring  the  loss  or  damage  shall  be  determined  in  accordance  with
Article XIV. To the extent that Landlord is obligated to pay for the repair or restoration of the loss or damage covered by
the  policy,  Landlord  shall  be  paid  the  proceeds  of  the  “all  risk”  insurance  covering  the  loss  or  damage.  To  the  extent
Tenant is obligated to pay for the repair or restoration of the loss or damage, covered by the policy, Tenant shall be paid
the proceeds of the “all risk” insurance covering the loss or damage. If both Landlord and Tenant are obligated to pay for
the repair or restoration of the loss or damage covered by the policy, the insurance proceeds shall be paid to each of them
in the pro rata proportion of their obligations to repair or restore the loss or damage. If the loss or damage is not repaired
or  restored  (for  example,  if  the  Lease  is  terminated  pursuant  to  Article  XIV),  the  insurance  proceeds  shall  be  paid  to
Landlord and Tenant in the pro rata proportion of their relative contributions to the cost of the leasehold improvements
covered by the policy.

13.5 Tenant’s Other Insurance

Tenant agrees to maintain in full force on or before the earlier of (i) the date on which any Tenant Party first enters the
Premises for any reason or (ii) the Commencement Date, and thereafter throughout the end of the Term, and after the end
of the Term for so long after the end of the Term as Tenant or anyone acting by, through or under Tenant is in occupancy
of  the  Premises  or  any  portion  thereafter,  (1)  comprehensive  automobile  liability  insurance  (covering  any  automobiles
owned or operated by Tenant) issued on a form at least as broad as ISO Business Auto Coverage form CA 00 01 07 97 or
other form providing equivalent coverage; (2) worker’s compensation insurance; and (3) employer’s liability insurance.
Such  automobile  liability  insurance  shall  be  in  an  amount  not  less  than  One  Million  Dollars  ($1,000,000)  for  each
accident. Such worker’s compensation insurance shall carry minimum limits as defined by the law of the jurisdiction in
which  the  Premises  are  located  (as  the  same  may  be  amended  from  time  to  time).  Such  employer’s  liability  insurance
shall be in an amount not less than One Million Dollars ($1,000,000) for each accident, One Million Dollars ($1,000,000)
disease-policy limit, and One Million Dollars ($1,000,000) disease-each employee.

13.6 Requirements for Tenant’s Insurance

All insurance required to be maintained by Tenant pursuant to this Lease shall be maintained with responsible companies
that are admitted to do business, and are in good standing in the Commonwealth of Massachusetts and that have a rating
of  at  least  “A(cid:0)”  and  are  within  a  financial  size  category  of  not  less  than  “Class  VIII”  in  the  most  current  Best’s  Key
Rating  Guide  or  such  similar  rating  as  may  be  reasonably  selected  by  Landlord.  All  such  insurance  shall:  (1)  be
acceptable  in  form  and  content  to  Landlord;  (2)  be  primary  and  noncontributory  (including  all  primary  and
excess/umbrella policies); and (3) if reasonably obtainable, contain an endorsement

prohibiting  cancellation,  failure  to  renew,  reduction  of  amount  of  insurance,  or  change  in  coverage  without  the  insurer
first giving Landlord thirty (30) days’ prior written notice (by certified or registered mail, return receipt requested, or by
fax or email) of such proposed action, and in any event, Tenant shall provide Landlord with at least thirty (30) days’ prior
written notice of any such cancellation, material change, failure to renew or reduction in the amount of such insurance. No
such  policy  shall  contain  any  self-insured  retention  greater  than  One  Hundred  Thousand  Dollars  ($100,000.00)  for
property  insurance  and  Twenty  Five  Thousand  Dollars  ($25,000.00)  for  commercial  general  liability  insurance.  Any
deductibles and such self-insured retentions shall be deemed to be “insurance” for purposes of the waiver in Section 13.13
below. Landlord  reserves  the  right  from  time  to  time,  but  not  sooner  than  the  first  anniversary  of  the  Commencement
Date, to require Tenant to obtain higher minimum amounts of insurance based on such limits as are customarily carried
with  respect  to  similar  properties  in  the  area  in  which  the  Premises  are  located.  The  minimum  amounts  of  insurance
required by this Lease shall not be reduced by the payment of claims or for any other reason. In the event Tenant shall fail
to obtain or maintain any insurance meeting the requirements of this Article, or to deliver such r certificates as required by
this Article, Landlord may, at its option, on five (5) business days’ notice to Tenant, procure such policies for the account
of Tenant, and the cost thereof shall be paid to Landlord within ten (10) days after delivery to Tenant of bills therefor.

13.7 Additional Insureds

To the fullest extent permitted by law, the commercial general liability and auto insurance carried by Tenant pursuant to
this  Lease,  and  any  additional  liability  insurance  carried  by  Tenant  pursuant  to  Section  13.3  of  this  Lease,  shall  name
Landlord, Landlord’s managing agent, and such other persons as Landlord may reasonably request from time to time as
additional insureds with respect to liability arising out of or related to this Lease or the operations of Tenant (collectively
“Additional Insureds”). Such  insurance  shall  provide  primary  coverage  without  contribution  from  any  other  insurance
carried by or for the benefit of Landlord, Landlord’s managing agent, or other Additional Insureds. Such insurance shall
also waive any right of subrogation against each Additional Insured. For the avoidance of doubt, each primary policy and
each excess/umbrella policy through which Tenant satisfies its obligations under this Section 13.7 must provide coverage
to the Additional Insureds that is primary and non-contributory.

13.8 Certificates of Insurance

On  or  before  the  earlier  of  (i)  the  date  on  which  any  Tenant  Party  first  enters  the  Premises  for  any  reason  or  (ii)  the
Commencement Date, Tenant shall furnish Landlord with certificates evidencing the insurance coverage required by this
Lease,  and  renewal  certificates  shall  be  furnished  to  Landlord  at  least  annually  thereafter,  and  at  least  thirty  (30)  days
prior to the expiration date of each policy for which a

certificate was furnished. Failure by the Tenant to provide the certificates or letters required by this Section 13.8 shall not
be deemed to be a waiver of the requirements in this Section 13.8. Upon request by Landlord, a true and complete copy of
any  insurance  policy  required  by  this  Lease  shall  be  delivered  to  Landlord  within  ten  (10)  days  following  Landlord’s
request.

13.9 Subtenants and Other Occupants

Tenant shall require its subtenants and other occupants of the Premises to provide written documentation evidencing the
obligation of such subtenant or other occupant to indemnify the Landlord Parties to the same extent that Tenant is required
to indemnify the Landlord Parties pursuant to Section 13.1 above, and to maintain insurance that meets the requirements
of  this  Article,  and  otherwise  to  comply  with  the  requirements  of  this  Article,  provided,  however,  with  respect  to  a
subtenant of less than all or substantially all of the Premises, Landlord will only require such subtenant to carry the same
insurance  as  Landlord  requires  of  Landlord’s  direct  tenants  of  comparable  size  as  the  subleased  premises.  Tenant  shall
require all such subtenants and occupants to supply certificates of insurance evidencing that the insurance requirements of
this Article have been met and shall forward such certificates to Landlord on or before the earlier of (i) the date on which
the  subtenant  or  other  occupant  or  any  of  their  respective  direct  or  indirect  partners,  officers,  shareholders,  directors,
members, trustees, beneficiaries, servants, employees, principals, contractors, licensees, agents, invitees or representatives
first  enters  the  Premises  or  (ii)  the  commencement  of  the  sublease.  Tenant  shall  be  responsible  for  identifying  and
remedying any deficiencies in such certificates or policy provisions.

13.10 No Violation of Building Policies

Tenant shall not commit or permit any violation of the policies of fire, boiler, sprinkler, water damage or other insurance
covering the Building and/or the fixtures, equipment and property therein carried by Landlord, or do or permit anything to
be done, or keep or permit anything to be kept, in the Premises, which in case of any of the foregoing (i) would result in
termination of any such policies, (ii) would adversely affect Landlord’s right of recovery under any of such policies, or
(iii)  would  result  in  reputable  and  independent  insurance  companies  refusing  to  insure  the  Building  or  the  property  of
Landlord in amounts reasonably satisfactory to Landlord.

13.11 Tenant to Pay Premium Increases

If, because of anything done, caused or permitted to be done, or omitted by Tenant (or its subtenant or other occupants of
the Premises), the rates for liability, fire, boiler, sprinkler, water damage or other insurance on the Building and equipment
of Landlord or any other tenant or subtenant in the Building shall be higher than they otherwise would be, Tenant shall
reimburse  Landlord  and/or  the  other  tenants  and  subtenants  in  the  Building  for  the  additional  insurance  premiums
thereafter paid by Landlord or by any of the other tenants and subtenants in the Building which shall

have  been  charged  because  of  the  aforesaid  reasons,  such  reimbursement  to  be  made  from  time  to  time  on  Landlord’s
demand.

13.12 Landlord’s Insurance

a.

b.

c.

d.

Required  insurance.  Landlord  shall  maintain  (i)  insurance  against  loss  or  damage  with  respect  to  the
Building on an “all risk” type insurance form, with customary exceptions, subject to such deductibles as
Landlord may reasonably determine, in an amount equal to at least the replacement value of the Building,
(ii) insurance with respect to any improvements, alterations, and fixtures of Tenant located at the Premises
to  the  extent  paid  for  by  Landlord,  and  (iii)  commercial  general  liability  coverage  with  respect  to  the
Property with the same minimum limits required to be carried by Tenant pursuant to Section 13.3 above of
this  Lease.  Any  and  all  such  insurance  (x)  may  be  maintained  under  a  blanket  policy  affecting  other
properties of Landlord and/or its affiliated business organizations, (y) may be written with deductibles as
reasonably determined by Landlord (which such deductible is currently $25,000.00 but which is subject to
increase  from  time  to  time  in  Landlord’s  reasonable  judgement)  and  (z)  shall  be  included  in  Landlord’s
Operating Expenses in accordance with Section 7.5. Such insurance shall be maintained with an insurance
company selected by Landlord. Payment for losses thereunder shall be made solely to Landlord.

Optional  insurance.  Landlord  may  maintain  such  additional  insurance  with  respect  to  the  Building,
including,  without  limitation,  earthquake  insurance,  terrorism  insurance,  flood  insurance,  liability
insurance and/or rent insurance, as Landlord may in its sole discretion elect. Landlord may also maintain
such other insurance as may from time to time be required by the holder of any mortgage on the Building.
The cost of all such additional insurance shall also be part of the Landlord’s Operating Expenses.

Blanket  and  self(cid:0)insurance.  Any  or  all  of  Landlord’s  insurance  may  be  provided  by  blanket  coverage
maintained  by  Landlord  or  any  affiliate  of  Landlord  under  its  insurance  program  for  its  portfolio  of
properties, or by Landlord or any affiliate of Landlord under a program of self-insurance, and in such event
Landlord’s Operating Expenses shall include the portion of the reasonable cost of blanket insurance or self-
insurance that is allocated to the Building.

No obligation. Landlord shall not be obligated to insure, and shall not assume any liability of risk of loss
for, Tenant’s Property, including any such property or work of Tenant’s subtenants or occupants. Landlord
will also have no obligation to carry insurance against, nor

be  responsible  for,  any  loss  suffered  by  Tenant,  subtenants  or  other  occupants  due  to  interruption  of
Tenant’s or any subtenant’s or occupant’s business.

13.13 Waiver of Subrogation

To the fullest extent permitted by law, the parties hereto waive and release any and all rights of recovery against the other,
and agree not to seek to recover from the other or to make any claim against the other, and in the case of Landlord, against
all “Tenant Parties” (hereinafter defined), and in the case of Tenant, against all “Landlord Parties” (hereinafter defined),
for  any  loss  or  damage  incurred  by  the  waiving/releasing  party  to  the  extent  such  loss  or  damage  is  insured  under  any
property insurance policy required by this Lease or which would have been so insured had the party carried the property
insurance it was required to carry hereunder. Tenant shall obtain from its subtenants and other occupants of the Premises a
similar waiver and release of claims against any or all of Tenant or Landlord. In addition, the parties hereto (and in the
case of Tenant, its subtenants and other occupants of the Premises) shall procure an appropriate clause in, or endorsement
on,  any  insurance  policy  required  by  this  Lease  pursuant  to  which  the  insurance  company  waives  subrogation.  The
insurance policies required by this Lease shall contain no provision that would invalidate or restrict the parties’ waiver
and  release of the rights  of  recovery  in  this  section. The  parties  hereto  covenant  that  no  insurer  shall  hold  any  right  of
subrogation against the parties hereto by virtue of such insurance policy.

The term “Landlord Party” or “Landlord Parties” shall mean Landlord, any affiliate of Landlord, Landlord’s managing
agents for the Building, each mortgagee (if any), each ground lessor (if any), and each of their respective direct or indirect
partners,  officers,  shareholders,  directors,  members,  trustees,  beneficiaries,  servants,  employees,  principals,  contractors,
licensees, agents or representatives. For the purposes of this Lease, the term “Tenant Party” or “Tenant Parties”  shall
mean Tenant, any affiliate of Tenant, any permitted subtenant or any other permitted occupant of the Premises, and each
of their respective direct or indirect partners, officers, shareholders, directors, members, trustees, beneficiaries, servants,
employees, principals, contractors, licensees, agents, invitees or representatives.

13.14  Tenant’s Work

During such times as Tenant is performing work or having work or services performed in or to the Premises, Tenant shall
require  its  contractors,  and  their  subcontractors  of  all  tiers,  to  obtain  and  maintain  commercial  general  liability,
automobile, workers compensation, employer’s liability, builder’s risk, and equipment/property insurance in such amounts
and on such terms as are customarily required of such contractors and subcontractors on similar projects. The  amounts
and  terms  of  all  such  insurance  are  subject  to  Landlord’s  written  approval,  which  approval  shall  not  be  unreasonably
withheld. The commercial general liability and auto insurance carried by Tenant’s contractors and their subcontractors of
all tiers pursuant

to  this  section  shall  name  Landlord,  Landlord’s  managing  agent,  and  such  other  persons  as  Landlord  may  reasonably
request from time to time as additional insureds with respect to liability arising out of or related to their work or services
(collectively “Additional Insureds”). Such insurance shall provide primary coverage without contribution from any other
insurance  carried  by  or  for  the  benefit  of  Landlord,  Landlord’s  managing  agent,  or  other  Additional  Insureds.  Such
insurance  shall  also  waive  any  right  of  subrogation  against  each  Additional  Insured.  Tenant  shall  obtain  and  submit  to
Landlord,  prior  to  the  earlier  of  (i)  the  entry  onto  the  Premises  by  such  contractors  or  subcontractors  or  (ii)
commencement  of  the  work  or  services,  certificates  of  insurance  evidencing  compliance  with  the  requirements  of  this
section.

ARTICLE XIV.

Fire, Casualty and Taking

14.1 Damage Resulting from Casualty

In case during the Lease Term the Building is damaged by fire or other casualty, Landlord shall within sixty (60) days
after  the  occurrence  thereof,  subject  to  Force  Majeure  and/or  delays  caused  by  Tenant,  notify  Tenant  in  writing  of
Landlord’s reasonable estimate of the length of time necessary to repair or restore such fire or casualty damage from the
time that repair work would commence (“Landlord’s Restoration Estimate”). If the Building is materially damaged by
fire or casualty, and such fire or casualty damage cannot, in the ordinary course, reasonably be expected to be repaired
within  one  hundred  eighty  (180)  days  from  the  time  that  repair  work  would  commence  as  reasonably  determined  by
Landlord, Landlord may, at its election, terminate this Lease by notice given to Tenant within sixty (60) days after the date
of such fire or other casualty, specifying the effective date of termination. The effective date of termination specified by
Landlord  shall  not  be  less  than  thirty  (30)  days  nor  more  than  forty-five  (45)  days  after  the  date  of  notice  of  such
termination.  Unless  terminated  pursuant  to  the  foregoing  provisions,  this  Lease  shall  remain  in  full  force  and  effect
following any such damage subject, however, to the following provisions.

If the Premises is materially damaged and Landlord’s Restoration Estimate exceeds two hundred ten (210) days from the
time  that  repair  work  would  commence,  Tenant  may,  at  its  election,  terminate  this  Lease  by  notice  given  to  Landlord
within  ten  (10)  business  days  after  the  receipt  of  Landlord’s  Restoration  Estimate,  specifying  the  effective  date  of
termination. The effective date of termination specified by Tenant shall not be less than thirty (30) days nor more than
forty-five (45) days after the date of notice of such termination.

If during the last Lease Year of the Lease Term (as it may have been extended), the Building shall be damaged by fire or
casualty and such fire or casualty damage to the Premises cannot reasonably be expected to be repaired or restored within
one hundred twenty (120) days from the time that repair or restoration work would commence as

reasonably determined by Landlord, then Tenant shall have the right, by giving notice to Landlord not later than thirty
(30) days after such damage, to terminate this Lease, whereupon this Lease shall terminate as of the date of such notice
with the same force and effect as if such date were the date originally established as the expiration date hereof.

If the Building or any part thereof is damaged by fire or casualty and this Lease is not so terminated, or Landlord has no
right to terminate this Lease, and in either such case the holder of any mortgage which includes the Building as a part of
the  mortgaged  premises  or  any  ground  lessor  of  any  ground  lease  which  includes  the  Building  as  part  of  the  demised
premises allows the net insurance proceeds to be applied to the restoration of the Building, Landlord, promptly after such
damage  and  the  determination  of  the  net  amount  of  insurance  proceeds  available  shall  use  due  diligence  to  restore  the
Premises  and  the  Building  in  the  event  of  damage  thereto  (excluding  Tenant’s  Property  (as  defined  in  Section  13.4
hereof), except as expressly provided in the immediately following paragraph of this Section 14.1) into proper condition
for use and occupation and a just proportion of the Annual Fixed Rent, the Operating Expenses Allocable to the Premises
and Landlord’s Tax Expenses Allocable to the Premises according to the nature and extent of the injury to the Premises
shall be abated from the date of casualty until the date that is thirty (30) days following the date that the Premises shall
have  been  put  by  Landlord  substantially  into  such  condition.  Notwithstanding  the  foregoing,  Landlord  shall  not  be
obligated to expend for such repairs and restoration any amount in excess of the net insurance proceeds.

Notwithstanding  the  foregoing,  if  Landlord  is  proceeding  with  the  restoration  of  the  Building  and  the  Premises  in
accordance with the previous paragraph, Landlord shall also restore any alterations, additions or improvements within the
Premises that are part of Tenant’s Property (x) which have previously been approved by Landlord in accordance with the
terms and provisions of this Lease and (y) with respect to which Tenant has carried “all risk” insurance covering the loss
or  damage  in  accordance  with  Section  13.4  below  and  pays  the  proceeds  of  such  insurance  (or  an  amount  equivalent
thereto)  to  Landlord  within  five  (5)  business  days  following  Landlord’s  written  request);  provided,  however,  that  in  no
event shall Landlord be required to fund any insufficiency in the insurance proceeds (or equivalent amount) provided by
Tenant with respect to such loss or damage (or to fund any of the costs of restoration in the absence of any payment by
Tenant).

Where Landlord is obligated or otherwise elects to effect restoration of the Premises, unless such restoration is completed
within  one  (1)  year  from  the  date  of  the  casualty,  such  period  to  be  subject,  however,  to  extension  where  the  delay  in
completion of such work is due to Force Majeure, as defined hereinbelow (but in no event beyond eighteen (18) months
from the date of the casualty or taking), Tenant, as its sole and exclusive remedy, shall have the right to terminate this
Lease at any time after the expiration of such one-year (as extended) period until the restoration is substantially

completed, such termination to take effect as of the thirtieth (30th) day after the date of receipt by Landlord of Tenant’s
notice,  with  the  same  force  and  effect  as  if  such  date  were  the  date  originally  established  as  the  expiration  date  hereof
unless,  within  such  thirty  (30)  day  period  such  restoration  is  substantially  completed,  in  which  case  Tenant’s  notice  of
termination shall be of no force and effect and this Lease and the Lease Term shall continue in full force and effect. The
term “Force Majeure” shall mean any prevention, delay or stoppage due to governmental regulation, strikes, lockouts, acts
of God, acts of war, terrorists acts, civil commotions, unusual scarcity of or inability to obtain labor or materials, labor
difficulties,  casualty  or  other  causes  reasonably  beyond  a  party’s  control  or  attributable  to  the  action  or  inaction  of  the
other party.

14.2 Uninsured Casualty

Notwithstanding anything to the contrary contained in this Lease, if the Building or the Premises shall be substantially
damaged by fire or casualty as the result of a risk not covered by the forms of casualty insurance at the time maintained
(or required to be maintained pursuant to the terms of this Lease) by Landlord and such fire or casualty damage cannot, in
the ordinary course, reasonably be expected to be repaired within one hundred twenty (120) days from the time that repair
work would commence, Landlord may, at its election, terminate the Term of this Lease by notice to Tenant given within
thirty (30) days after such loss. If Landlord shall give such notice, then this Lease shall terminate as of the date of such
notice with the same force and effect as if such date were the date originally established as the expiration date hereof.

14.3 Rights of Termination for Taking

If the entire Building, or such portion thereof as to render the balance (if reconstructed to the maximum extent practicable
in  the  circumstances)  unsuitable  for  Tenant’s  purposes,  shall  be  taken  by  condemnation  or  right  of  eminent  domain,
Landlord or Tenant shall have the right to terminate this Lease by notice to the other of its desire to do so, provided that
such notice is given not later than thirty (30) days after Tenant has been deprived of possession. If either party shall give
such notice, then this Lease shall terminate as of the date of such notice with the same force and effect as if such date
were the date originally established as the expiration date hereof.

Further,  if  so  much  of  the  Building  shall  be  so  taken  that  continued  operation  of  the  Building  would  be  uneconomic,
Landlord shall have the right to terminate this Lease by giving notice to Tenant of Landlord’s desire to do so not later than
thirty (30) days after Tenant has been deprived of possession of the Premises (or such portion thereof as may be taken). If
Landlord shall give such notice, then this Lease shall terminate as of the date of such notice with the same force and effect
as if such date were the date originally established as the expiration date hereof.

Should any part of the Premises be so taken or condemned during the Lease Term hereof, and should this Lease not be
terminated in accordance with the foregoing provisions, and the holder of any mortgage which includes the Premises as
part  of  the  mortgaged  premises  or  any  ground  lessor  of  any  ground  lease  which  includes  the  Premises  as  part  of  the
demised premises allows the net condemnation proceeds to be applied to the restoration of the Building, Landlord agrees
that after the determination of the net amount of condemnation proceeds available to Landlord, Landlord shall use due
diligence to put what may remain of the Premises into proper condition for use and occupation as nearly like the condition
of the Premises prior to such taking as shall be practicable (excluding Tenant’s Property). Notwithstanding the foregoing,
Landlord shall not be obligated to expend for such repair and restoration any amount in excess of the net condemnation
proceeds made available to it.

If the Premises shall be affected by any exercise of the power of eminent domain and neither Landlord nor Tenant shall
terminate this Lease as provided above, then the Annual Fixed Rent, Operating Expenses Allocable to the Premises and
Landlord’s  Tax  Expenses  Allocable  to  the  Premises  shall  be  justly  and  equitably  abated  and  reduced  according  to  the
nature and extent of the loss of use thereof suffered by Tenant; and in case of a taking which permanently reduces the
Rentable Floor Area of the Premises, a just proportion of the Annual Fixed Rent, Operating Expenses Allocable to the
Premises and Landlord’s Tax Expenses Allocable to the Premises shall be abated for the remainder of the Lease Term.

14.4 Award

Except  as  otherwise  provided  in  this  Section  14.4,  Landlord  shall  have  and  hereby  reserves  and  excepts,  and  Tenant
hereby grants and assigns to Landlord, all rights to recover for damages to the Building and the leasehold interest hereby
created, and compensation accrued or hereafter to accrue by reason of such taking, damage or destruction, as aforesaid,
and  by  way  of  confirming  the  foregoing,  Tenant  hereby  grants  and  assigns,  and  covenants  with  Landlord  to  grant  and
assign to Landlord, all rights to such damages or compensation.

However, nothing contained herein shall be construed to prevent Tenant from prosecuting in any such proceedings a claim
for its trade fixtures so taken or relocation, moving and other dislocation expenses, and the unamortized cost of leasehold
improvements and Alterations paid for by Tenant, including, the Tenant Improvement Work (as defined in Exhibit B-1) to
the  extent  not  paid  for  out  of  the  Landlord’s  Contribution,  provided  that  such  action  shall  not  affect  the  amount  of
compensation otherwise recoverable by Landlord from the taking authority.

15.1 Tenant’s Default

ARTICLE XV.

Default

This Lease and the term of this Lease are subject to the limitation that Tenant shall be in default if, at any time during the
Lease  Term,  any  one  or  more  of  the  following  events  (herein  called  an  “Event  of  Default”  a  “default  of  Tenant”  or
similar  reference)  shall  occur  and  not  be  cured  prior  to  the  expiration  of  the  grace  period  (if  any)  herein  provided,  as
follows:

a.

b.

c.

d.

e.

f.

Tenant  shall  fail  to  pay  any  installment  of  the  Annual  Fixed  Rent,  or  any  Additional  Rent  or  any  other
monetary amount due under this Lease on or before the date on which the same becomes due and payable,
and such failure continues for five (5) business days after written notice from Landlord thereof; or

Landlord  having  rightfully  given  the  written  notice  specified  in  (a)  above  to  Tenant  twice  in  any  twelve
(12) month period, Tenant shall fail thereafter to pay the Annual Fixed Rent, Additional Rent or any other
monetary amount due under this Lease on or before the date on which the same becomes due and payable;
or

Tenant  shall  assign  its  interest  in  this  Lease  or  sublet  any  portion  of  the  Premises  in  violation  of  the
requirements of Article XII of this Lease and the same continues for fifteen (15) business days after written
notice from Landlord thereof; or

Tenant  shall  fail  to  perform  or  observe  some  term  or  condition  of  this  Lease  which,  because  of  its
character,  would  immediately  jeopardize  Landlord’s  interest  (such  as,  but  without  limitation,  failure  to
maintain general liability insurance, or the employment of labor and contractors within the Premises which
interfere with Landlord’s work, in violation of Sections 9.3, 11.2 or 11.10 or Exhibit B(cid:0)1 or a failure to
observe the requirements of Section 11.2), and such failure continues for three (3) days after notice from
Landlord to Tenant thereof; or

Tenant  shall  fail  to  perform  or  observe  any  other  requirement,  term,  covenant  or  condition  of  this  Lease
(not  hereinabove  in  this  Section  15.1  specifically  referred  to)  on  the  part  of  Tenant  to  be  performed  or
observed and such failure shall continue for thirty (30) days after notice thereof from Landlord to Tenant,
or  if  said  default  shall  reasonably  require  longer  than  thirty  (30)  days  to  cure,  if  Tenant  shall  fail  to
commence  to  cure  said  default  within  thirty  (30)  days  after  notice  thereof  and/or  fail  to  continuously
prosecute the curing of the same to completion with due diligence; or

The  estate  hereby  created  shall  be  taken  on  execution  or  by  other  process  of  law  and  shall  remain
undismissed or unstayed for ninety (90) days; or

g.

h.

i.

j.

k.

l.

Tenant shall make an assignment or trust mortgage arrangement, so-called, for the benefit of its creditors;
or

Tenant shall judicially be declared bankrupt or insolvent according to law; or

a receiver, guardian, conservator, trustee in involuntary bankruptcy or other similar officer is appointed to
take charge of all or any substantial part of Tenant’s property by a court of competent jurisdiction; or

any petition shall be filed against Tenant in any court, whether or not pursuant to any statute of the United
States  or  of  any  State,  in  any  bankruptcy,  reorganization,  composition,  extension,  arrangement  or
insolvency proceeding, and such proceedings shall not be fully and finally dismissed within sixty (60) days
after the institution of the same; or

Tenant shall file any petition in any court, whether or not pursuant to any statute of the United States or
any  State,  in  any  bankruptcy,  reorganization,  composition,  extension,  arrangement  or  insolvency
proceeding; or

Tenant  otherwise  abandons  or  vacates  the  Premises  and  leaves  the  same  in  an  unsafe  condition  or  in  a
manner  that  detracts  from  the  first  class  appearance  of  the  Building  (and  taking  into  consideration  that
Tenant is not actively operating business in the Premises).

15.2 Termination; Re-Entry

Upon the happening of any one or more of the aforementioned Events of Default (notwithstanding any license of a former
breach  of  covenant  or  waiver  of  the  benefit  hereof  or  consent  in  a  former  instance),  Landlord  or  Landlord’s  agents  or
servants may give to Tenant a notice (hereinafter called “notice of termination”) terminating this Lease on a date specified
in  such  notice  of  termination  (which  shall  be  not  less  than  five  (5)  days  after  the  date  of  the  mailing  of  such  notice  of
termination),  and  this  Lease  and  the  Lease  Term,  as  well  as  any  and  all  of  the  right,  title  and  interest  of  the  Tenant
hereunder, shall wholly cease and expire on the date set forth in such notice of termination (Tenant hereby waiving any
rights  of  redemption)  in  the  same  manner  and  with  the  same  force  and  effect  as  if  such  date  were  the  date  originally
specified herein for the expiration of the Lease Term, and Tenant shall then quit and surrender the Premises to Landlord.

In addition or as an alternative to the giving of such notice of termination, Landlord or Landlord’s agents or servants may,
by  any  suitable  action  or  proceeding  at  law,  immediately  or  at  any  time  thereafter  re(cid:0)enter  the  Premises  and  remove
therefrom

Tenant,  its  agents,  employees,  servants,  licensees,  and  any  subtenants  and  other  persons,  and  all  or  any  of  its  or  their
property  therefrom,  and  repossess  and  enjoy  the  Premises,  together  with  all  additions,  alterations  and  improvements
thereto; but, in any event under this Section 15.2, Tenant shall remain liable as hereinafter provided.

The  words  “re(cid:0)enter”  and  “re(cid:0)entry”  as  used  throughout  this  Article  XV  are  not  restricted  to  their  technical  legal
meanings.

15.3 Continued Liability; Re-Letting

If this Lease is terminated or if Landlord shall re-enter the Premises as aforesaid, or in the event of the termination of this
Lease,  or  of  re-  entry,  by  or  under  any  proceeding  or  action  or  any  provision  of  law  by  reason  of  an  Event  of  Default
hereunder on the part of Tenant, Tenant covenants and agrees forthwith to pay and be liable for, on the days originally
fixed herein for the payment thereof, amounts equal to the several installments of Annual Fixed Rent, all Additional Rent
and other charges reserved as they would, under the terms of this Lease, become due if this Lease had not been terminated
or if Landlord had not entered or re-entered, as aforesaid, and whether the Premises be relet or remain vacant, in whole or
in part, or for a period less than the remainder of the Lease Term, or for the whole thereof, but, in the event the Premises
be relet by Landlord, Tenant shall be entitled to a credit in the net amount of rent and other charges received by Landlord
in  reletting,  after  deduction  of  all  reasonable  expenses  incurred  in  reletting  the  Premises  (including,  without  limitation,
remodeling costs, brokerage fees and the like), and in collecting the rent in connection therewith, in the following manner:

Amounts  received  by  Landlord  after  reletting  shall  first  be  applied  against  such  Landlord’s  expenses,  until  the
same  are  recovered,  and  until  such  recovery,  Tenant  shall  pay,  as  of  each  day  when  a  payment  would  fall  due
under  this  Lease,  the  amount  which  Tenant  is  obligated  to  pay  under  the  terms  of  this  Lease  (Tenant’s  liability
prior  to  any  such  reletting  and  such  recovery  not  in  any  way  to  be  diminished  as  a  result  of  the  fact  that  such
reletting might be for a rent higher than the rent provided for in this Lease); when and if such expenses have been
completely recovered, the amounts received from reletting by Landlord as have not previously been applied shall
be credited against Tenant’s obligations as of each day when a payment would fall due under this Lease, and only
the net amount thereof shall be payable by Tenant. Further, Tenant shall not be entitled to any credit of any kind
for any period after the date when the term of this Lease is scheduled to expire according to its terms.

Landlord agrees to  use  reasonable  efforts  to  relet  the  Premises  after  Tenant  vacates the same in the event this Lease is
terminated based upon an Event of Default by Tenant hereunder. The marketing of the Premises in a manner similar to the
manner in which Landlord markets other premises within Landlord’s control within the Building shall be deemed to have
satisfied Landlord’s obligation to use “reasonable

efforts” hereunder. In no event shall Landlord be required to (i) solicit or entertain negotiations with any other prospective
tenant for the Premises until Landlord obtains full and complete possession of the Premises (including, without limitation,
the  final  and  unappealable  legal  right  to  relet  the  Premises  free  of  any  claim  of  Tenant),  (ii)  relet  the  Premises  before
leasing other vacant space in the Building, or (iii) lease the Premises for a rental less than the current fair market rent then
prevailing for similar office space in the Building.

Notwithstanding  the  foregoing  or  anything  to  the  contrary  contained  in  this  Lease,  Landlord  shall  not  be  entitled  to
accelerate any portion of the Annual Fixed Rent or any Additional Rent payable under this Lease on account of a Default
of Tenant or termination of this Lease or Tenant’s right to possession of the Premises except as expressly set forth Section
15.4 below.

15.4 Liquidated Damages

Landlord  may  elect,  as  an  alternative,  to  have  Tenant  pay  liquidated  damages,  which  election  may  be  made  by  notice
given to Tenant not later than twelve (12) months after the effective termination date of this Lease under Section 15.2,
above, and whether or not Landlord shall have collected any damages as hereinbefore provided in this Article XV, and in
lieu of all other such damages beyond the date of such notice. Upon such notice, Tenant shall promptly pay to Landlord,
as liquidated damages, in addition to any damages collected or due from Tenant from any period prior to such notice and
all expenses which Landlord may have incurred with respect to the collection of such damages, such a sum as at the time
of such notice represents the amount of the excess, if any, of (a) the discounted present value, using the Federal Reserve
discount  rate  (or  equivalent),  of  the  Annual  Fixed  Rent,  Additional  Rent  and  other  charges  which  would  have  been
payable by Tenant under this Lease for the remainder of the Lease Term if the Lease terms had been fully complied with
by Tenant, over and above (b) the discounted present value, using the Federal Reserve discount rate (or equivalent), of the
Annual Fixed Rent, Additional Rent and other charges that would be received by Landlord if the Premises were re(cid:0)leased
at the time of such notice for the remainder of the Lease Term at the fair market value (including provisions regarding
periodic  increases  in  Annual  Fixed  Rent  if  such  are  applicable)  prevailing  at  the  time  of  such  notice  as  reasonably
determined by Landlord.

For the purposes of this Article, if Landlord elects to require Tenant to pay liquidated damages in accordance with this
Section 15.4, the total rent shall be computed by assuming the Landlord’s Tax Expenses Allocable to the Premises under
Section 6.2 and the Operating Expenses Allocable to the Premises under Section 7.5 to be the same as were payable for
the twelve (12) calendar months (or if less than twelve (12) calendar months have been elapsed since the date hereof, the
partial year) immediately preceding such termination of re(cid:0)entry.

Nothing contained in this Lease shall limit or prejudice the right of Landlord to prove for and obtain in proceedings for
bankruptcy or insolvency by reason of the termination of this Lease, an amount equal to the maximum allowed by any
statute  or  rule  of  law  in  effect  at  the  time  when,  and  governing  the  proceeds  in  which,  the  damages  are  to  be  proved,
whether or not the amount be greater, equal to, or less than the amount of the loss or damages referred to above.

15.5 Waiver of Redemption

Tenant, for itself and any and all persons claiming through or under Tenant, including its creditors, upon the termination
of this Lease and of the term of this Lease in accordance with the terms hereof, or in the event of entry of judgment for the
recovery of the possession of the Premises in any action or proceeding, or if Landlord shall enter the Premises by process
of law or otherwise, hereby waives any right of redemption provided or permitted by any statute, law or decision now or
hereafter in force, and does hereby waive, surrender and give up all rights or privileges which it or they may or might
have under and by reason of any present or future law or decision, to redeem the Premises or for a continuation of this
Lease for the term of this Lease hereby demised after having been dispossessed or ejected therefrom by process of law, or
otherwise.

15.6 Landlord’s Default

Landlord shall in no event be in default in the performance of any of Landlord’s obligations hereunder unless and until
Landlord shall have failed to perform such obligations within thirty (30) days (ten (10) business days in the event of non-
payment of a monetary obligation of Landlord to Tenant), or such additional time as is reasonably required to correct any
such  default,  after  notice  by  Tenant  to  Landlord  properly  specifying  wherein  Landlord  has  failed  to  perform  any  such
obligation.

Tenant  shall  not  assert  any  right  to  deduct  the  cost  of  repairs  or  any  monetary  claim  against  the  Landlord  from  rent
thereafter due and payable, but shall look solely to the Landlord for satisfaction of such claim.

ARTICLE XVI.

Miscellaneous Provisions

16.1 Waiver

Failure on the part of Landlord or Tenant to complain of any action or non-action on the part of the other, no matter how
long the same may continue, shall never be a waiver by Tenant or Landlord, respectively, of any of its rights hereunder.

Further, no waiver at any time of any of the provisions hereof by Landlord or Tenant shall be construed as a waiver of any
of the other provisions hereof, and a waiver at

any time of any of the provisions hereof shall not be construed as a waiver at any subsequent time of the same provisions.
The consent or approval of Landlord or Tenant to or of any action by the other requiring such consent or approval shall
not  be  construed  to  waive  or  render  unnecessary  Landlord’s  or  Tenant’s  consent  or  approval  to  or  of  any  subsequent
similar act by the other.

No payment by Tenant, or acceptance by Landlord, of a lesser amount than shall be due from Tenant to Landlord shall be
treated  otherwise  than  as  a  payment  on  account.  The  acceptance  by  Landlord  of  a  check  for  a  lesser  amount  with  an
endorsement or statement thereon, or upon any letter accompanying such check, that such lesser amount is payment in
full, shall be given no effect, and Landlord may accept such check without prejudice to any other rights or remedies which
Landlord may have against Tenant. Further, the acceptance by Landlord of Annual Fixed Rent, Additional Rent or any
other charges paid by Tenant under this Lease shall not be or be deemed to be a waiver by Landlord of any default by
Tenant, whether or not Landlord knows of such default, except for such defaults as to which such payment relates.

16.2 Cumulative Remedies

Except  as  expressly  provided  in  this  Lease,  the  specific  remedies  to  which  Landlord  and  Tenant  may  resort  under  the
terms of this Lease are cumulative and are not intended to be exclusive of any other remedies or means of redress which
they  may  be  lawfully  entitled  to  seek  in  case  of  any  breach  or  threatened  breach  of  any  provisions  of  this  Lease.  In
addition  to  the  other  remedies  provided  in  this  Lease,  Landlord  shall  be  entitled  to  the  restraint  by  injunction  of  the
violation or attempted or threatened violation of any of the covenants, conditions or provisions of this Lease or to seek
specific performance of any such covenants, conditions or provisions, provided, however, that the foregoing shall not be
construed as a confession of judgment by Tenant.

16.3 Quiet Enjoyment

This  Lease  is  subject  and  subordinate  to  all  matters  of  record.  Landlord  agrees  that,  upon  Tenant’s  paying  the  Annual
Fixed Rent, Additional Rent and other charges herein reserved, and performing and observing the covenants, conditions
and  agreements  hereof  upon  the  part  of  Tenant  to  be  performed  and  observed,  and  so  long  as  an  Event  of  Default  by
Tenant is not in existence under this Lease, Tenant shall and may peaceably hold and enjoy the Premises during the term
of this Lease (exclusive of any period during which Tenant is holding over after the expiration or termination of this Lease
without the consent of Landlord), without interruption or disturbance from Landlord or persons claiming through or under
Landlord, subject, however, to the terms of this Lease. This covenant shall be construed as running with the land to and
against  subsequent  owners  and  successors  in  interest,  and  is  not,  nor  shall  it  operate  or  be  construed  as,  a  personal
covenant of Landlord, except to the extent of the Landlord’s interest in the Premises, and this covenant and any and all

other covenants of Landlord contained in this Lease shall be binding upon Landlord and upon such subsequent owners or
successors  in  interest  of  Landlord’s  interest  under  this  Lease,  including  ground  or  master  lessees,  to  the  extent  of  their
respective interests, as and when they shall acquire same and then only for so long as they shall retain such interest.

16.4 Surrender

A.

B.

No  act  or  thing  done  by  Landlord  during  the  Lease  Term  shall  be  deemed  an  acceptance  of  a  surrender  of  the
Premises,  and  no  agreement  to  accept  such  surrender  shall  be  valid,  unless  in  writing  signed  by  Landlord.  No
employee  of  Landlord  or  of  Landlord’s  agents  shall  have  any  power  to  accept  the  keys  of  the  Premises  as  an
acceptance  of  a  surrender  of  the  Premises  prior  to  the  termination  of  this  Lease;  provided,  however,  that  the
foregoing shall not apply to the delivery of keys to Landlord or its agents in its (or their) capacity as managing
agent  or  for  purpose  of  emergency  access.  In  any  event,  however,  the  delivery  of  keys  to  any  employee  of
Landlord or of Landlord’s agents shall not operate as a termination of the Lease or a surrender of the Premises.

Upon the expiration or earlier termination of the Lease Term, Tenant shall surrender the Premises to Landlord in
the condition as required by Sections 8.1 and 9.5, first removing all goods and effects of Tenant and completing
such other removals as may be permitted or required pursuant to Section 9.5.

16.5 Brokerage

A.

B.

Tenant warrants and represents that Tenant has not dealt with any broker in connection with the consummation of
this Lease other than the broker, person or firm designated in Section 1.2 hereof (the “Broker”); and in the event
any claim is made against the Landlord relative to dealings by Tenant with brokers other than the Broker, Tenant
shall  defend  the  claim  against  Landlord  with  counsel  of  Tenant’s  selection  first  approved  by  Landlord  (which
approval will not be unreasonably withheld) and save harmless and indemnify Landlord on account of loss, cost or
damage which may arise by reason of such claim.

Landlord  warrants  and  represents  that  Landlord  has  not  dealt  with  any  broker  in  connection  with  the
consummation of this Lease other than the Broker; and in the event any claim is made against the Tenant relative
to dealings by Landlord with brokers including the Broker, Landlord shall defend the claim against Tenant with
counsel of Landlord’s selection first approved by Tenant (which approval will not be unreasonably withheld) and
save harmless and indemnify Tenant on account of loss, cost or damage which may arise by reason of such claim.
Landlord agrees that it shall be solely responsible for the payment of brokerage commissions to the Broker for the
Original Lease

Term pursuant to a separate written agreement between Landlord and such Broker.

16.6 Invalidity of Particular Provisions

If  any  term  or  provision  of  this  Lease,  including  but  not  limited  to  any  waiver  of  contribution  or  claims,  indemnity,
obligation, or limitation of liability or of damages, or the application thereof to any person or circumstance shall, to any
extent, be invalid or unenforceable, the remainder of this Lease, or the application of such term or provision to persons or
circumstances other than those as to which it is held invalid or unenforceable, shall not be affected thereby, and each term
and provision of this Lease shall be valid and be enforced to the fullest extent permitted by law.

16.7 Provisions Binding, Etc.

The obligations of this Lease shall run with the land, and except as herein otherwise provided, the terms hereof shall be
binding  upon  and  shall  inure  to  the  benefit  of  the  successors  and  assigns,  respectively,  of  Landlord  and  Tenant  and,  if
Tenant shall be an individual, upon and to his heirs, executors, administrators, successors and assigns. Each term and each
provision of this Lease to be performed by Tenant shall be construed to be both a covenant and a condition. The reference
contained  to  successors  and  assigns  of  Tenant  is  not  intended  to  constitute  a  consent  to  assignment  by  Tenant,  but  has
reference only to those instances in which Landlord may have later given consent to a particular assignment as required
by the provisions of Article XII hereof.

16.8 Recording; Confidentiality

Landlord and Tenant agree not to record the within Lease, but simultaneously with their execution and delivery of this
Lease to execute and deliver a Notice of Lease in the form attached hereto as Exhibit K. In no event shall such document
set forth the rent or other charges payable by Tenant under this Lease; and any such document shall expressly state that it
is executed pursuant to the provisions contained in this Lease, and is not intended to vary the terms and conditions of this
Lease.

Tenant agrees that this Lease and the terms contained herein will be treated as strictly confidential and except as required
by law (or except with the written consent of Landlord) Tenant shall not disclose the same to any third party except for
Tenant’s employees, brokers, agents, partners, lenders, accountants and attorneys and like parties who have been advised
of the confidentiality provisions contained herein and agree to be bound by the same. In the event Tenant is required by
law to provide this Lease or disclose any of its terms, Tenant shall give Landlord prompt notice of such requirement prior
to making disclosure so that Landlord may seek an appropriate protective order. If failing the entry of a protective order
Tenant is compelled to make disclosure, Tenant shall only disclose portions of the Lease which Tenant is

required to disclose and will exercise reasonable efforts to obtain assurance that confidential treatment will be accorded to
the information so disclosed.

16.9 Notices and Time for Action

Whenever, by the terms of this Lease, notice shall or may be given either to Landlord or to Tenant, such notices shall be in
writing  and  shall  be  sent  by  hand,  registered  or  certified  mail,  or  overnight  or  other  commercial  courier,  postage  or
delivery charges, as the case may be, prepaid as follows:

If intended for Landlord, addressed to Landlord at the address set forth in Article I of this Lease (or to such other
address or addresses as may from time to time hereafter be designated by Landlord by like notice) with a copy to
Landlord, Attention: Regional General Counsel.

If intended for Tenant, addressed to Tenant at the address set forth in Article I of this Lease except that from and
after the Commencement Date the address of Tenant shall be the Premises (or to such other address or addresses as
may from time to time hereafter be designated by Tenant by like notice).

Except  as  otherwise  provided  herein,  all  such  notices  shall  be  effective  when  received;  provided,  that  (i)  if  receipt  is
refused,  notice  shall  be  effective  upon  the  first  occasion  that  such  receipt  is  refused,  (ii)  if  the  notice  is  unable  to  be
delivered due to a change of address of which no notice was given, notice shall be effective upon the date such delivery
was attempted, (iii) if the notice address is a post office box number, notice shall be effective the day after such notice is
sent as provided hereinabove or (iv) if the notice is to a foreign address, notice shall be effective two (2) days after such
notice is sent as provided hereinabove.

Where provision is made for the attention of an individual or department, the notice shall be effective only if the wrapper
in which such notice is sent is addressed to the attention of such individual or department.

Any notice given by an attorney on behalf of Landlord or by Landlord’s managing agent shall be considered as given by
Landlord and shall be fully effective.

Time is of the essence with respect to any and all notices and periods for giving of notice or taking any action thereto
under this Lease.

16.10 When Lease Becomes Binding and Authority

Employees  or  agents  of  Landlord  have  no  authority  to  make  or  agree  to  make  a  lease  or  any  other  agreement  or
undertaking in connection herewith. The submission of this document for examination and negotiation does not constitute
an offer to lease, or a reservation of, or option for, the Premises, and this document shall become effective and binding
only upon the execution and delivery hereof by both Landlord and

Tenant.  All  negotiations,  considerations,  representations  and  understandings  between  Landlord  and  Tenant  are
incorporated herein and may be modified or altered only by written agreement between Landlord and Tenant, and no act
or omission of any employee or agent of Landlord shall alter, change or modify any of the provisions hereof. Landlord
and Tenant hereby represents and warrants to the other that all necessary action has been taken to enter this Lease and that
the person signing this Lease on behalf of Landlord and Tenant has been duly authorized to do so.

16.11 Paragraph Headings

The  paragraph  headings  throughout  this  instrument  are  for  convenience  and  reference  only,  and  the  words  contained
therein  shall  in  no  way  be  held  to  explain,  modify,  amplify  or  aid  in  the  interpretation,  construction  or  meaning  of  the
provisions of this Lease.

16.12 Rights of Mortgagee

This Lease shall be subject and subordinate to any mortgage now or hereafter on the Building, and to each advance made
or  hereafter  to  be  made  under  any  mortgage,  and  to  all  renewals,  modifications,  consolidations,  replacements  and
extensions thereof and all substitutions therefore, provided, however, that in consideration of and as a condition precedent
to Tenant’s agreement to subordinate this Lease with respect to mortgages hereafter placed on the Building shall be the
receipt  by  Tenant  of  a  commercially  reasonable  nondisturbance  agreement  from  and  wherein  the  applicable  mortgagee
expressly recognizes the rights of Tenant under this Lease (including the right to use and occupy the Premises and to lease
additional premises at the Building) upon the payment of rent and other charges payable by Tenant under this Lease and
the  performance  by  Tenant  of  Tenant’s  obligations  hereunder.  In  confirmation  of  such  subordination  and  recognition,
Tenant  shall  execute  and  deliver  promptly  an  instrument  of  subordination  and  recognition  (an  “SNDA”)  in  the  form
attached hereto as Exhibit L, as amended by such commercially reasonable changes as Tenant may reasonably request. In
the event that any mortgagee or its respective successor in title shall succeed to the interest of Landlord, then, this Lease
shall nevertheless continue in full force and effect and Tenant shall and does hereby agree to attorn to such mortgagee or
successor and to recognize such mortgagee or successor as its landlord. If any holder of a mortgage which includes the
Premises,  executed  and  recorded  prior  to  the  date  of  this  Lease,  shall  so  elect,  this  Lease  and  the  rights  of  Tenant
hereunder, shall be superior in right to the rights of such holder, with the same force and effect as if this Lease had been
executed, delivered and recorded, or a statutory notice hereof recorded, prior to the execution, delivery and recording of
any such mortgage. The election of any such holder shall become effective upon either notice from such holder to Tenant
in the same fashion as notices from Landlord to Tenant are to be given hereunder or by the recording in the appropriate
registry  or  recorder’s  office  of  an  instrument  in  which  such  holder  subordinates  its  rights  under  such  mortgage  to  this
Lease.

If  in  connection  with  obtaining  financing  a  bank,  insurance  company,  pension  trust  or  other  institutional  lender  shall
request reasonable modifications in this Lease as a condition to such financing, Tenant will not unreasonably withhold,
delay or condition its consent thereto, provided that such modifications do not increase the monetary obligations of Tenant
hereunder or materially adversely affect the leasehold interest hereby created or Tenant’s rights hereunder.

16.13 Rights of Ground Lessor

If Landlord’s interest in property (whether land only or land and buildings) which includes the Premises is acquired by
another party and simultaneously leased back to Landlord herein, the holder of the ground lessor’s interest in such lease
shall  enter  into  a  recognition  agreement  with  Tenant  simultaneously  with  the  sale  and  leaseback,  wherein  the  ground
lessor will agree to recognize the right of Tenant to use and occupy the Premises upon the payment of Annual Fixed Rent,
Additional  Rent  and  other  charges  payable  by  Tenant  under  this  Lease  and  the  performance  by  Tenant  of  Tenant’s
obligations hereunder, and wherein Tenant shall agree to attorn to such ground lessor as its Landlord and to perform and
observe  all  of  the  tenant  obligations  hereunder,  in  the  event  such  ground  lessor  succeeds  to  the  interest  of  Landlord
hereunder under such ground lease.

16.14 Notice to Mortgagee and Ground Lessor

After receiving notice from any person, firm or other entity that it holds a mortgage which includes the Premises as part of
the mortgaged premises, or that it is the ground lessor under a lease with Landlord as ground lessee, which includes the
Premises as a part of the leased premises, no notice of a default from Tenant to Landlord shall be effective unless and until
a copy of the same is given to such holder or ground lessor at the address as specified in said notice (as it may from time
to time be changed), and the curing of any of Landlord’s defaults by such holder or ground lessor within a reasonable time
after such notice (including a reasonable time to obtain possession of the premises if the mortgagee or ground lessor elects
to  do  so)  shall  be  treated  as  performance  by  Landlord.  For  the  purposes  of  this  Section  16.14,  the  term  “mortgage”
includes a mortgage on a leasehold interest of Landlord (but not one on Tenant’s leasehold interest). If any mortgage is
listed  on  Exhibit  I  then  the  same  shall  constitute  notice  from  the  holder  of  such  mortgage  for  the  purposes  of  this
Section 16.14.

16.15 Assignment of Rents

With  reference  to  any  assignment  by  Landlord  of  Landlord’s  interest  in  this  Lease,  or  the  rents  payable  hereunder,
conditional  in  nature  or  otherwise,  which  assignment  is  made  to  the  holder  of  a  mortgage  or  ground  lease  on  property
which includes the Premises, Tenant agrees:

a.

That the execution thereof by Landlord, and the acceptance thereof by the holder of such mortgage, or the
ground  lessor,  shall  never  be  treated  as  an  assumption  by  such  holder  or  ground  lessor  of  any  of  the
obligations  of  Landlord  hereunder,  unless  such  holder,  or  ground  lessor,  shall,  by  notice  sent  to  Tenant,
specifically otherwise elect or upon foreclosure of such holder’s mortgage and the taking of possession of
the Premises, or, in the case of a ground lessor, the assumption of Landlord’s position hereunder by such
ground lessor.

In no event shall the acquisition of title to the Building and the land on which the same is located by a purchaser which,
simultaneously therewith, leases the entire Building or such land back to the seller thereof be treated as an assumption, by
operation of law or otherwise, of Landlord’s obligations hereunder, but Tenant shall look solely to such seller-lessee, and
its  successors  from  time  to  time  in  title,  for  performance  of  Landlord’s  obligations  hereunder.  In  any  such  event,  this
Lease  shall  be  subject  and  subordinate  to  the  lease  to  such  purchaser  provided  that  such  purchaser-lessor  agrees  in  a
written  non  disturbance  agreement  reasonably  acceptable  to  Tenant  to  recognize  the  rights  of  Tenant  under  this  Lease,
including the right of Tenant to use and occupy the Premises upon the payment of rent and all other charges payable by
Tenant under this Lease and the performance by Tenant of Tenant’s obligations under this Lease. For all purposes, such
seller  lessee,  and  its  successors  in  title,  shall  be  the  landlord  hereunder  unless  and  until  Landlord’s  position  shall  have
been assumed by such purchaser-lessor.

16.16 Status Report and Financial Statements

Recognizing  that  Landlord  may  find  it  necessary  to  establish  to  third  parties,  such  as  accountants,  banks,  potential  or
existing  mortgagees,  potential  purchasers  or  the  like,  the  then  current  status  of  performance  hereunder,  Tenant,  within
fifteen  (15)  business  days  after  the  request  of  Landlord  made  from  time  to  time,  will  within  fifteen  (15)  business  days
after such request furnish to Landlord, or any existing or potential holder of any mortgage encumbering the Premises or
the Building, or any potential purchaser of the Premises or the Building (each an “Interested Party”) a statement of the
status of any matter pertaining to this Lease, including, without limitation, acknowledgments that (or the extent to which)
each  party  is  in  compliance  with  its  obligations  under  the  terms  of  this  Lease.  In  addition,  Tenant  shall  deliver  to
Landlord, or any Interested Party designated by Landlord, upon Landlord’s written request given not more than once in
any  12-month  period,  the  most  recent  audited  financial  statements  of  Tenant  and  any  guarantor  of  Tenant’s  obligations
under this Lease, as requested by Landlord, or if Tenant does not have its financials audited, Tenant shall provide financial
statements  certified  by  the  appropriate  accounting  or  finance  officer  of  Tenant,  including,  but  not  limited  to,  a  balance
sheet,  income  statement  and  cash  flow  statements  which  financial  statements  shall  include  sufficient  detail  and
information for Landlord to assess Tenant’s financial condition. Any such

status  statement  or  financial  statement  delivered  by  Tenant  pursuant  to  this  Section  16.16  may  be  relied  upon  by  any
Interested Party.

Landlord shall keep any non-public information provided by Tenant pursuant to this Section 16.16 confidential, and shall
not disclose the same other than (i) to Landlord’s officers, employees and consultants (or to any of the Interested Parties)
or (ii) to the extent required by applicable law or by any administrative, governmental or judicial proceeding.

16.17  Self-Help

If Tenant shall at any time fail to make any payment or perform any act which Tenant is obligated to make or perform
under this Lease and (except in the case of emergency) if the same continues unpaid or unperformed beyond applicable
grace  periods,  then  Landlord  may,  but  shall  not  be  obligated  so  to  do,  after  ten  (10)  days’  notice  to  and  demand  upon
Tenant,  or  without  notice  to  or  demand  upon  Tenant  in  the  case  of  any  emergency,  and  without  waiving,  or  releasing
Tenant from, any obligations of Tenant in this Lease contained, make such payment or perform such act which Tenant is
obligated  to  perform  under  this  Lease  in  such  manner  and  to  such  extent  as  may  be  reasonably  necessary,  and,  in
exercising any such rights, pay any costs and expenses, employ counsel and incur and pay reasonable attorneys’ fees. All
sums so paid by Landlord and all reasonable and necessary costs and expenses of Landlord incidental thereto, together
with  interest  thereon  at  the  Default  Interest  Rate  (as  defined  in  Section  16.21),  from  the  date  of  the  making  of  such
expenditures  by  Landlord,  shall  be  deemed  to  be  Additional  Rent  and,  except  as  otherwise  in  this  Lease  expressly
provided, shall be payable to the Landlord on demand, and if not promptly paid shall be added to any rent then due or
thereafter becoming due under this Lease, and Tenant covenants to pay any such sum or sums with interest as aforesaid,
and Landlord shall have (in addition to any other right or remedy of Landlord) the same rights and remedies in the event
of the non-payment thereof by Tenant as in the case of default by Tenant in the payment of Annual Fixed Rent.

16.18 Holding Over

Any holding over by Tenant after the expiration of the term of this Lease shall be treated as a tenancy at sufferance and
shall be on the terms and conditions as set forth in this Lease, as far as applicable except that Tenant shall pay as a use and
occupancy charge an amount equal to the greater of (y) (i) for the first thirty (30) days of any such holdover, an amount
equal to 125% of the sum of the Annual Fixed Rent and Additional Rent (including Operating Expenses Allocable to the
Premises and Landlord’s Tax Expenses Allocable to the Premises) calculated (on a daily basis) at the rate payable under
the terms of this Lease immediately prior to the commencement of such holdover, (ii) during the second month of any
such holdover, an amount equal to 150% of the Annual Fixed Rent and Additional Rent (including Operating Expenses
Allocable to the Premises and Landlord’s Tax Expenses Allocable to the Premises) calculated (on a daily basis) at the rate
payable under the

terms  of  this  Lease  immediately  prior  to  the  commencement  of  such  holdover,  and  (iii)  thereafter  during  any  such
holdover period, an amount equal to 200% of the Annual Fixed Rent and Additional Rent (including Operating Expenses
Allocable to the Premises and Landlord’s Tax Expenses Allocable to the Premises) calculated (on a daily basis) at the rate
payable under the terms of this Lease immediately prior to the commencement of such holdover, or (x) the fair market
rental value of the Premises; in each case for the period measured from the day on which Tenant’s hold-over commences
and terminating on the day on which Tenant vacates the Premises. In addition, Tenant shall save Landlord, its agents and
employees harmless and will exonerate, defend and indemnify Landlord, its agents and employees from and against any
and all damages which Landlord may suffer on account of Tenant’s hold(cid:0)over in the Premises after the expiration or prior
termination of the Term of this Lease; provided, however, Tenant shall not be liable for indirect or consequential damages
suffered by Landlord on account of any such holding over by Tenant unless such holding over continues for more than
thirty (30) days after the expiration of the Term of this Lease. Nothing in the foregoing nor any other term or provision of
this Lease shall be deemed to permit Tenant to retain possession of the Premises or hold over in the Premises after the
expiration or earlier termination of the Lease Term. All property which remains in the Building or the Premises after the
expiration  or  termination  of  this  Lease  shall  be  conclusively  deemed  to  be  abandoned  and  may  either  be  retained  by
Landlord as its property or sold or otherwise disposed of in such manner as Landlord may see fit. If any part thereof shall
be sold, then Landlord may receive the proceeds of such sale and apply the same, at its option against the expenses of the
sale, the cost of moving and storage, any arrears of rent or other charges payable hereunder by Tenant to Landlord and any
damages to which Landlord may be entitled under this Lease and at law and in equity.

16.19 Entry by Landlord

Landlord, and its duly authorized representatives, shall, upon reasonable prior notice (except in the case of emergency),
have the right to enter the Premises at all reasonable times (except at any time in the case of emergency) for the purposes
of  inspecting  the  condition  of  same  and  making  such  repairs,  alterations,  additions  or  improvements  thereto  as  may  be
necessary if Tenant fails to do so as required hereunder (but the Landlord shall have no duty whatsoever to make any such
inspections, repairs, alterations, additions or improvements except as otherwise provided in Sections 4.1, 7.1 and 7.2 and
Exhibit B(cid:0)1), and to show the Premises to prospective tenants during the fifteen (15) months preceding expiration of the
Term of this Lease as it may have been extended (or during the final twenty(cid:0)four (24) months of the Term if Tenant has
no  further  extension  options)  and  at  any  reasonable  time  during  the  Lease  Term  to  show  the  Premises  to  prospective
purchasers  and  mortgagees.  Landlord  agrees  to  use  commercially  reasonable  efforts  to  not  unreasonably  interfere  with
Tenant’s use of the Premises during any such entry into the Premises and to schedule any such access hereunder during
Tenant’s normal business hours and in the presence of a Tenant representative when feasible, except in

the event of an emergency, and any work in any portion of the Premises then occupied by Tenant that would interfere with
the  operation  of  a  first-class  business  office  (whether  due  to  noise,  the  creation  of  dirt  or  debris,  or  otherwise)  will  be
performed after the Building’s normal business hours.

16.20 Tenant’s Payments

Each  and  every  payment  and  expenditure,  other  than  Annual  Fixed  Rent,  shall  be  deemed  to  be  Additional  Rent
hereunder, whether or not the provisions requiring payment of such amounts specifically so state, and shall be payable,
unless otherwise provided in this Lease, within ten (10) business days after written demand by Landlord, and in the case
of the non-payment of any such amount, Landlord shall have, in addition to all of its other rights and remedies, all the
rights and remedies available to Landlord hereunder or by law in the case of non-payment of Annual Fixed Rent. Unless
expressly  otherwise  provided  in  this  Lease,  the  performance  and  observance  by  Tenant  of  all  the  terms,  covenants  and
conditions of this Lease to be performed and observed by Tenant shall be at Tenant’s sole cost and expense. Subject to
Tenant’s express rights under Section 7.6 of this Lease, if Tenant has not objected to any statement of Additional Rent
which is rendered by Landlord to Tenant within ninety (90) days after Landlord has rendered the same to Tenant, then the
same shall be deemed to be a final account between Landlord and Tenant not subject to any further dispute. In the event
that  Tenant  shall  seek  Landlord’s  consent  or  approval  under  this  Lease,  then  Tenant  shall  reimburse  Landlord,  upon
demand, as Additional Rent, for all reasonable costs and expenses, including legal and architectural costs and expenses,
incurred by Landlord in processing such request, whether or not such consent or approval shall be given.

16.21 Late Payment

If  Landlord  shall  not  have  received  any  payment  or  installment  of  Annual  Fixed  Rent  or  Additional  Rent  (the
“Outstanding  Amount”)  on  or  before  the  date  on  which  the  same  first  becomes  payable  under  this  Lease  (the  “Due
Date”), the amount of such payment or installment shall incur a late charge equal to the sum of: (a) five percent (5%) of
the Outstanding Amount for administration and bookkeeping costs associated with the late payment and (b) interest on the
Outstanding  Amount  from  the  Due  Date  through  and  including  the  date  such  payment  or  installment  is  received  by
Landlord, at a rate (the “Default Interest Rate”) equal to the lesser of (i) the rate announced by Bank of America, N.A.
(or  its  successor)  from  time  to  time  as  its  prime  or  base  rate  (or  if  such  rate  is  no  longer  available,  a  comparable  rate
reasonably  selected  by  Landlord),  plus  four  percent  (4%),  or  (ii)  the  maximum  applicable  legal  rate,  if  any.  However,
Landlord agrees to waive the late charge due hereunder for the first late payment by Tenant under this Lease per calendar
year, provided that Landlord receives such payment from Tenant within five (5) business days after written notice of such
delinquency is given to Tenant (provided that if such payment is not received within the aforesaid five (5) business day
period, interest on the Outstanding Amount

will accrue as of the original Due Date). Such late charge and interest shall be deemed Additional Rent and shall be paid
by Tenant to Landlord upon demand.

16.22 Counterparts

This Lease may be executed in several counterparts, each of which shall be deemed an original, and such counterparts
shall constitute but one and the same instrument.

16.23 Entire Agreement

This Lease constitutes the entire agreement between the parties hereto, Landlord’s managing agent and their respective
affiliates with respect to the subject matter hereof and thereof and supersedes all prior dealings between them with respect
to such subject matter, and there are no verbal or collateral understandings, agreements, representations or warranties not
expressly set forth in this Lease. No subsequent alteration, amendment, change or addition to this Lease shall be binding
upon Landlord or Tenant, unless reduced to writing and signed by the party or parties to be charged therewith.

16.24 Landlord Liability

Tenant shall neither assert nor seek to enforce any claim for breach of this Lease against any of Landlord’s assets other
than Landlord’s interest in the Building and the rent, insurance proceeds, condemnation awards, and other income derived
therefrom,  and  Tenant  agrees  to  look  solely  to  such  interest  for  the  satisfaction  of  any  liability  of  Landlord  under  this
Lease, it being specifically agreed that neither Landlord, nor any successor holder of Landlord’s interest hereunder, nor
any beneficiary of any Trust of which any person from time to time holding Landlord’s interest is Trustee, nor any such
Trustee,  nor  any  member,  manager,  partner,  director  or  stockholder  nor  Landlord’s  managing  agent  shall  ever  be
personally liable for any such liability. This paragraph shall not limit any right that Tenant might otherwise have to obtain
injunctive relief against Landlord or Landlord’s successors-in-interest, or to take any other action which shall not involve
the personal liability of Landlord, or of any successor holder of Landlord’s interest hereunder, or of any beneficiary of any
trust  of  which  any  person  from  time  to  time  holding  Landlord’s  interest  is  Trustee,  or  of  any  such  Trustee,  or  of  any
manager, member, partner, director or stockholder of Landlord or of Landlord’s managing agent, to respond in monetary
damages from Landlord’s assets other than Landlord’s interest in said Building, as aforesaid, but in no event shall Tenant
have the right to terminate or cancel this Lease or to withhold rent or to set-off any claim or damages against rent as a
result of any default by Landlord or breach by Landlord of its covenants or any warranties or promises hereunder. In no
event shall Landlord ever be liable for any indirect or consequential damages or loss of profits or the like.

16.25 No Partnership

The  relationship  of  the  parties  hereto  is  that  of  landlord  and  tenant  and  no  partnership,  joint  venture  or  participation  is
hereby created.

16.26 Letter of Credit

(A) Concurrently with the execution of this Lease, Tenant shall pay to Landlord a security deposit in the amount of One
Million One Hundred Forty Thousand Three Hundred Seventy Eight Dollars and Sixty Cents ($1,140,378.60) and
Landlord  shall  hold  the  same,  throughout  the  Term  of  this  Lease  (including  the  Extended  Term,  if  applicable),
unless sooner returned to Tenant as provided in this Section 16.26, as security for the performance by Tenant of all
obligations  on  the  part  of  Tenant  to  be  performed  under  this  Lease.  Such  deposit  shall  be  in  the  form  of  an
irrevocable, unconditional, negotiable letter of credit (the “Letter of Credit”) provided that cash may be deposited
at  the  Commencement  Date  for  up  to  sixty  (60)  days  while  Tenant  secures  the  Letter  of  Credit  in  conformance
with this Section 16.26. The Letter of Credit shall (i) be issued by and drawn on a bank reasonably approved by
Landlord and at a minimum having a long term issuer credit rating from Standard and Poor’s Professional Rating
Service of A or a comparable rating from Moody’s Professional Rating Service, (ii) be substantially in the form
attached  hereto  as  Exhibit  J  or  on  another  form  reasonably  satisfactory  to  Landlord,  (iii)  permit  one  or  more
draws thereunder to be made accompanied only by certification by Landlord or Landlord’s managing agent that
pursuant to the terms of this Lease, Landlord is entitled to draw upon such Letter of Credit, (iv) permit transfers at
any time without charge, (v) permit presentment in Boston, Massachusetts, or by facsimile with presentation by
overnight  delivery  the  next  day,  and  (iv)  provide  that  any  notices  to  Landlord  be  sent  to  the  notice  address
provided for Landlord in this Lease. Landlord acknowledges that the letter of credit issued by Silicon Valley Bank
simultaneously with the execution of this Lease has been approved by Landlord. If the credit rating for the issuer
of such Letter of Credit falls below the standard set forth in (i) above or if the financial condition of such issuer
changes in any other material adverse way, Landlord shall have the right to require that Tenant provide a substitute
letter of credit that complies in all respects with the requirements of this Section, and Tenant’s failure to provide
the  same  within  thirty  (30)  days  following  Landlord’s  written  demand  therefor  shall  entitle  Landlord  to
immediately draw upon the Letter of Credit. Any such Letter of Credit shall be for a term of one (1) year and shall
in either case provide for automatic renewals through the date which is sixty (60) days subsequent to the scheduled
expiration of this Lease (as the same may be extended) or if the issuer will not grant automatic renewals, the Letter
of  Credit  shall  be  renewed  by  Tenant  each  year  and  each  such  renewal  shall  be  delivered  to  and  received  by
Landlord not later than thirty (30) days before the expiration of the then current Letter of Credit (herein called a
“Renewal Presentation Date”). In the event of a failure to so deliver any such renewal Letter of Credit on or

before the applicable Renewal Presentation Date, Landlord shall be entitled to present the then existing Letter of
Credit for payment and to receive the proceeds thereof, which proceeds shall be held as Tenant’s security deposit,
subject to the terms of this Section 16.26. Any failure or refusal of the issuer to honor the Letter of Credit shall be
at Tenant’s sole risk and shall not relieve Tenant of its obligations hereunder with regard to the security deposit.
Upon the occurrence of any default of Tenant, Landlord shall have the right from time to time without prejudice to
any other remedy Landlord may have on account thereof, to draw on all or any portion of such deposit held as a
Letter of Credit and to apply the proceeds of such Letter of Credit or any cash held as such deposit, or any part
thereof, to Landlord’s damages arising from such default on the part of Tenant under the terms of this Lease. If
Landlord  so  applies  all  or  any  portion  of  such  deposit,  Tenant  shall  within  seven  (7)  days  after  notice  from
Landlord deposit cash with Landlord in an amount sufficient to restore such deposit to the full amount stated in
this Section 16.26. While Landlord holds any cash deposit Landlord shall have no obligation to pay interest on the
same  and  shall  have  the  right  to  commingle  the  same  with  Landlord’s  other  funds.  Neither  the  holder  of  a
mortgage nor the Landlord in a ground lease on property which includes the Premises shall ever be responsible to
Tenant  for  the  return  or  application  of  any  such  deposit,  whether  or  not  it  succeeds  to  the  position  of  Landlord
hereunder, unless such deposit shall have been received in hand by such holder or ground Landlord.

(B) If Tenant satisfies the Reduction Condition as of the applicable Reduction Review Date, as such terms are hereinafter
defined,  then,  upon  written  request  of  Tenant,  the  amount  of  the  Letter  of  Credit  shall  be  reduced  to  (i)  Eight
Hundred Fifty Five Thousand Two Hundred Eighty Three Dollars and Ninety Five Cents ($855,283.95) if, as of
the expiration of the first full Rent Year no monetary or material non-monetary Event of Default by Tenant has
occurred,  and  (ii)  Five  Hundred  Seventy  Thousand  One  Hundred  Eighty  Nine  Dollars  and  Thirty  Cents
($570,189.30) if, as of the expiration of the second full Rent Year no monetary or material non-monetary Event of
Default by Tenant has occurred. In no event shall the Letter of Credit have automatic reduction provisions. Upon
Tenant’s satisfaction of the Reduction Condition(s), Landlord shall authorize Tenant and the Letter of Credit issuer
to  amend  or  replace  the  existing  Letter  of  Credit,  at  Tenant’s  option  and  at  Tenant’s  sole  cost  and  expense,  in
accordance with the reduced amounts set forth in this Section 16.26(B).

(C) Tenant not then being in default and having performed all of its obligations under this Lease in all material respects,
including the payment of all Annual Fixed Rent, Landlord shall return the deposit, or so much thereof as shall not
have theretofore been applied in accordance with the terms of this Section 16.26, to Tenant on the expiration or
earlier termination of the term of this Lease (as the same may have been extended) and surrender possession of the

Premises by Tenant to Landlord in the condition required in the Lease at such time.

16.27 Electronic Signatures

The parties acknowledge and agree that this Lease may be executed by electronic signature, which shall be considered as
an original signature for all purposes and shall have the same force and effect as an original signature.  Without limitation,
“electronic  signature”  shall  include  faxed  versions  of  an  original  signature  or  electronically  scanned  and  transmitted
versions (e.g., via pdf) of an original signature.

16.28 Reserved

16.29 Governing Law

This  Lease  shall  be  governed  exclusively  by  the  provisions  hereof  and  by  the  law  of  The  Commonwealth  of
Massachusetts, as the same may from time to time exist.

16.30 Payment of Litigation Expenses

In the event of litigation or other legal proceeding between Landlord and Tenant relating to the provisions of this Lease or
Tenant’s  occupancy  of  the  Premises  or  in  connection  with  any  bankruptcy  case,  the  losing  party  shall,  upon  demand,
reimburse  the  prevailing  party  for  its  reasonable  costs  of  prosecuting  and/or  defending  such  proceeding  (including,
without limitation, reasonable attorneys’ fees).

16.31 Waiver of Trial by Jury

To induce Landlord to enter into this Lease, the Tenant hereby waives any right to trial by jury in any action, proceeding
or counterclaim brought by either Landlord or Tenant on any matters whatsoever arising out of or any way connected with
this  Lease,  the  relationship  of  the  Landlord  and  the  Tenant,  the  Tenant’s  use  or  occupancy  of  the  premises  and/or  any
claim of injury or damage, including but not limited to, any summary process eviction action.

ARTICLE XVII.

Tenant Signage

17.1 Definitions.

The  following  terms  have  the  meanings  herein  set  forth  for  all  purposes  under  this  Lease,  and  capitalized  terms  used  in  the
following definitions which are not elsewhere defined in this Lease are defined in this Section 17.1:

A.

B.

C.

D.

E.

F.

“Building Signage” means one (1) “blade” identification sign with Tenant’s name and logo on the exterior façade
of the Building.

"Lobby Signage" means one (1) non-exclusive sign with Tenant’s name to be located on the main lobby directory
signage listings.

“Premises Signage” means Building-standard identification sign with Tenant’s name on the entry of the Premises.

“Signage Appearance Standards” means that the finished appearance, taking into account the applicable Signage
Factors,  (i)  shall  be  of  high  quality  and  have  a  tasteful  presentation  which  is  aesthetically  compatible  and
harmonious  with  the  architectural  elements  of  the  Building  and  the  Complex,  (ii)  shall  not  interfere  with
Landlord’s ability to use, operate, maintain and manage the Building in a first-class manner similar to other office
buildings in similar locations, with similar types of tenants, and (iii) shall comply in all respects with any historic
preservation restriction applicable to the Building.

“Signage Factors” means the design, size, materials, quality, method of attachment, coloring and location of the
signage.

“Tenant’s Signage” means that the Building Signage, the Lobby Signage and the Premises Signage.

17.2 Signage.

A.

B.

Landlord shall provide and install, at Landlord’s expense, letters or numerals on the main entrance door to the Premises to
identify Tenant’s name and Building address; all such letters and numerals shall be in the building standard graphics and
no others shall be used or permitted on the Premises.  In addition, Tenant shall have the right, at its sole cost and expense
and subject to Landlord’s right to reasonably approve all graphics, to install letters or numerals on all other entrance doors
to the Premises to identify Tenant’s name and Building address and that of its permitted subtenant or any other permitted
occupant of the Premises.

Tenant shall have the right, at its sole cost and expense, to design and install the Building Signage, subject to applicable
zoning  requirements,  applicable  laws,  any  historic  preservation  restrictions  or  requirements  in  connection  with  the
Historic Tax Credits, and to Tenant obtaining all necessary permits and approvals therefor (Landlord hereby agreeing to
cooperate  with  Tenant,  at  no  cost  or  expense  to  Landlord,  in  Tenant’s  obtaining  of  such  permits  and  approvals).  The
location of the Building Signage and the final design thereof shall be subject to Landlord’s approval, which shall not be
unreasonably withheld or delayed.

C.

Landlord shall provide and install, at Landlord’s expense, the Lobby Signage with Landlord’s building standard letters,
numerals and graphics.

D.

E.

F.

G.

H.

Tenant’s  Signage  shall  satisfy,  as  determined  by  Landlord  in  Landlord’s  reasonable  discretion,  the  Signage  Appearance
Standards in all respects.

The installation and maintenance of Tenant’s Building Signage shall be at the sole cost and expense of Tenant except that
Landlord shall be responsible for the costs of any structural supports or modifications required for the Building to affix
the Building Signage to the Building.  Landlord shall not be liable or responsible to Tenant for any damage to Tenant’s
Signage unless resulting from the negligence or willful misconduct of Landlord or any of the Landlord Parties and subject
to the provisions of Section 13.14 of this Lease; provided, however, that Landlord, at Tenant’s sole cost and expense and
with  Tenant’s  prior  written  approval  (which  such  approval  shall  be  deemed  granted  if  Tenant  fails  to  respond  to
Landlord’s  request  within  five  (5)  business  days  after  delivery),  shall  maintain  the  Tenant’s  Signage  and  repair  any
damage to Tenant’s Signage.  Tenant agrees to pay Landlord as Additional Rent the actual and reasonable cost of any such
maintenance and repairs within thirty (30) days after delivery by Landlord of a bill therefor.

The rights provided to Tenant under this Section 17.2 are personal to Tenant and may not be transferred or assigned. 

Upon the expiration or earlier termination of this Lease, Tenant shall remove all (and at any time prior thereto Tenant may
remove any) of Tenant’s Signage at Tenant’s sole cost and expense (exclusive of any main lobby directory sign listings of
Tenant  which  shall  be  removed  by  Landlord)  and  shall,  at  Tenant’s  sole  cost  and  expense,  restore  any  damage  to  the
Building caused by such removal.

If  necessary  or  advisable  in  connection  with  maintenance,  repairs  or  construction,  Landlord  may,  at  Tenant’s  cost  and
expense, temporarily cover or remove Tenant’s Signage for the reasonable duration of the subject work and Landlord will
be responsible to repair any damage to Tenant’s Signage caused by Landlord’s performance of such maintenance, repairs
or construction. 

[Remainder of Page Intentionally Blank]

EXECUTED as a sealed instrument in two or more counterparts by persons or officers hereunto duly authorized on the

Date set forth in Section 1.2 above.

LANDLORD:
BEACON NORTH VILLAGE, LLC

By: /s/ Raymond J.Ciccolo________
Name: Raymond J. Ciccolo________
Title: President__________________

TENANT:
X4 Pharmaceuticals, Inc., a Massachusetts corporation

By:  /s/ Adam Mostafa 
Name: Adam Mostafa 
Title: Chief Financial Officer 
Hereunto duly authorized

1

MASTER SERVICES AGREEMENT

(Not Intended to Govern Services Related to Commercial Product)

Exhibit 10.35

THIS MASTER SERVICES AGREEMENT (this "Agreement"), effective as of the 10th

day of September, 2015 (the "Effective Date"), by and between Metrics, Inc., doing business as Metrics Contract Services, a North Carolina corporation,
having a principal place of business at 1240 Sugg Parkway, Greenville, NC 27834 ("METRICS"), and X4 Pharmaceuticals, Inc., a Delaware corporation
having an address at Cambridge Innovation Center, One Broadway, Cambridge, MA 02142 ("COMPANY").

WITNESSETH

WHEREAS, COMPANY is engaged in the business of the research, development and commercialization of pharmaceutical and biotechnology

products;

WHEREAS, ·METRICS is engaged in the business of, among other things, providing contract pharmaceutical development, formulation and

analytical services;

WHEREAS,  COMPANY  desires  to  engage  the  services  of  METRICS  to  assist  COMPANY  in  certain  pharmaceutical  development  activities

upon the terms and conditions set forth herein; and

WHEREAS, METRICS's performance pursuant to this Agreement may require the parties to disclose to each other confidential and proprietary

information, inventions, trade secrets and know-how, which must be protected from disclosure to third parties;

NOW, THEREFORE, in consideration of the foregoing, and other good and valuable consideration, the receipt and sufficiency of which are

hereby acknowledged, the parties hereto do hereby agree as follows:

1 Definitions.

1.1 "Applicable Laws" means all laws, ordinances, rules and regulations of the United States (and such other jurisdictions, as applicable, where
any  aspect  of  Services  are  performed  by  Metrics  outside  the  United  States)  applicable  to  the  conduct  of  the  Services  and/or  the
development, manufacture and use of any Product (as defined below) or any aspect thereof and the obligations of a party, as the context
requires, under this Agreement, as amended from time to time. For purposes of clarity, cGMPs shall be included as part of Applicable
Laws unless expressly agreed otherwise in a Work Statement or Quote.

1.2 "cGMP" means all then-current applicable laws, regulations and recognized good manufacturing practices that apply in the United States and
the European Union to the manufacture of any therapeutically active material that provides pharmacological activity in a pharmaceutical
product,  and  govern  the  standards  of  manufacture  of  any  product  intended  for  human  use,  including,  as  applicable  the  United  States
regulations  set  forth  under  21  CFR  parts  210,  211,  as  well  as  applicable  guidance  published  by  the  FDA;  and  (ii)  the  EU  good
manufacturing  practices  set  forth  in  the  European  Community  directives  2003/94/EC  2001/83/EC  as  amended  by  2004/27/EC,  all
relevant implementations of such directives and all relevant principles and guidelines including ICH Tripartite Guidance Q7 and Volume
4 of the Rules Governing Medicinal Products in the European Union. Medicinal Products for Human and Veterinary Use; in each case as
may be modified or supplemented during the Term.

1.3  "Confidential  Information"  (i)  shall,  with  respect  to  COMPANY,  mean  (a)  all  information  disclosed  by,  or  on  behalf  of  COMPANY  to
METRICS, including, but not limited to, the Materials, and Licensed Intellectual Property, whether or not labeled "Confidential," and
(b) any knowledge, information, inventions and data developed by METRICS, but only to the extent resulting from Services performed
under  the  applicable  Work  Statement  or  Quote,  including  any  such  knowledge,  information,  inventions  and  data  expressly  identified
therein as either a

"Deliverable"  or  "Work  Product,"  as  the  case  may  be,  and  (ii)  shall,  with  respect  to  METRICS,  mean  (a)  METRICS  Technology  and
METRICS Improvements, whether or not labeled "Confidential," (b) non-public business or financial information of METRICS, and (c)
any other information disclosed by or on behalf of METRICS to COMPANY relating to price estimates, quotations or proposals which
are issued to COMPANY, including any price estimates, quotations and proposals that do not become the subject of a Work Statement or
Quote.

1.4  "Deliverable" means any Product, substance, material or report to be developed for, or delivered to, COMPANY by METRICS and expressly

identified as a "Deliverable" in a Work Statement or Quote.

1.5   "Facility"  means  METRICS'  manufacturing  and  laboratory  facilities  located  at  1240  Sugg  Parkway,  Greenville,  NC  27834  and  warehouse
located  at  5440  Martin  Luther  King  Highway,  Greenville,  NC,  27834,  or  any  other  METRICS  facility  as  agreed  to  in  writing  by  the
parties.

1.6  "FDCA" means the United States Federal food, Drug and Cosmetic Act, as amended.

1.7 "Materials" means all documentation, information and data, as well as all chemical materials, API, intermediates or raw materials, disclosed
or  furnished  to  METRICS  by  or  on  behalf  of  COMPANY  in  connection  with  this  Agreement,  including  any  such  materials  expressly
identified as "Materials" in the applicable Work Statement or Quote.

1.8  "METRICS  Improvements"  means  any  inventions,  discoveries,  works  of  authorship  (including,  without  limitation,  computer  software  and
related  code  and  documentation),  trademarks,  service  marks,  trade  secrets,  know-how,  products,  processes,  materials,  systems,  tools,
methodologies,  technologies,  and  other  intellectual  property,  created,  conceived,  reduced  to  practice  or  otherwise  developed  by
METRICS in  the conduct of the Services that  relate  solely  to  general  analytical  and  manufacturing  methods  comprising  METRICS
Technology or METRICS standard computer software and that are not specific to Materials, any Deliverables or any Product.

1.9 "METRICS Technology" means any and all (i) inventions, discoveries, works of authorship (including without limitation computer software
and related code and documentation), trademarks, service marks, trade secrets, know-how, products, processes, materials, systems, tools,
methodologies,  technologies,  and  other  intellectual  property  created,  conceived,  reduced  to  practice,  or  otherwise  developed  by  or  on
behalf  of,  or  otherwise  obtained  by  or  licensed  by  third  parties  to,  METRICS  as  of  the  Effective  Date;  (ii)  improvements,  derivative
works,  compilations,  and  other  modifications  of  the  foregoing  in  clause  (i)  created,  conceived,  reduced  to  practice,  or  otherwise
developed after the Effective Date outside of the conduct of the Services; and (iii) all patent, trademark, copyright, trade secret, and other
intellectual property rights (collectively, "Intellectual Property Rights") in and to the foregoing in clauses (i) and (ii). Without limiting the
foregoing,  "METRICS  Technology"  shall  include  any  standard  software  and  related  software  technology  independently  developed  or
otherwise improved by METRICS, outside of the conduct of the Services.

1.10 "Licensed Intellectual Prope1iy" means any and all (i) inventions, discoveries, works of authorship (including without limitation computer
software  and  related  code  and  documentation),  trademarks,  service  marks,  trade  secrets,  know-how,  products,  processes,  materials,
systems,  tools,  methodologies,  technologies,  and  other  intellectual  property  created,  conceived,  reduced  to  practice,  or  otherwise
developed  by  or  on  behalf  of,  or  otherwise  obtained  by  or  licensed  by  third  parties  to,  COMPANY  as  of  the  Effective  Date;  (ii)  all
improvements,  derivative  works,  compilations,  and  other  modifications  of  the  foregoing  in  clause  (i)  created,  conceived,  reduced  to
practice, or otherwise developed after the Effective Date outside of the conduct of the Services; and (iii) all Intellectual Property Rights in
and to the foregoing in clauses (i) and (ii), which are, in any such case, owned or controlled by COMPANY and necessary or useful for
METRICS' performance and provision of the Services.

1.11  "Non-Conforming Product" means (a) any Product that is manufactured by METRICS as part of a development run under this Agreement
that fails to conform  to  the  applicable  Manufacturing  Specifications  (as  agreed  to  by  METRICS  or  determined  by  such  independent
laboratory  or  consultant)  to  the  extent  that  such  failure  is  attributable  to  a  failure  by  METRICS  to  comply  with  the  processes  and
procedures  established  for  the  manufacture  of  such  Product  at  the  date  of  manufacture  and  (b)  any  Product  that  is  manufactured  by
METRICS as part of a GMP run under

this Agreement that fails to conform to the applicable Manufacturing Specifications (as agreed to by METRICS or determined by such
independent laboratory or consultant) to the extent that such failure is attributable to any act or omission of METRICS.

1.12    "Product"  means  any  pharmaceutical  product  owned  or  controlled  by  COMPANY  that  is  developed  or  manufactured  for  COMPANY  by
METRICS,  or  with  respect  to  which  Services  are  conducted  by  METRICS,  as  provided  in  this  Agreement  and  the  applicable  Work
Statement or Quote.

1.13    "Regulatory  Authority"  shall  mean  any  US  or  EU  national,  regional,  state  or  local  regulatory  agency,  department,  bureau,  commission,
council or other governmental entity with authority over the manufacture, production, use or storage, transport or clinical testing of any
Product, including the United States Food and Drug Administration (the "FDA") or any successor agency or authority thereto and the
European Medicines Agency (the "EMA"), or any successor agency or authority thereto, and the European Commission.

1.14  "Results" is defined in Section 4.3.

1.15    "Services"  means  the  work,  tasks,  and  services  performed  and  conducted  by  METRICS  under  this  Agreement  and  as  may  be  further
described in the applicable Work Statement or Quote.

1.16  "Work  Product"  means  all  discoveries,  inventions,  improvements,  know-how,  processes,  formulations,  procedures,  methods,  reports,  data,
Results,  information  and  documentation,  other  than  METRICS  Improvements,  that  are  generated  by  METRICS  while  conducting  the
Services.

1.17 "Work Statement" or "Quote" means each document agreed to between and executed by the parties that outlines, among other things, the plan
for  Services  to  be  provided  by  METRICS,  the  particular  Services  to  be  provided  by  METRICS,  the  Materials  to  be  provided  by
COMPANY,  any  Deliverables  or  Products  to  be  developed  or  manufactured  by  METRICS,  the  time  schedule  for  performance,  the
amount,  schedule  and  method  of  payment  to  be  made  by  COMPANY,  and  any  other  terms  and  conditions  mutually  agreeable  to  the
parties, and, in the case of a Work Statement, will be included as a schedule to this Agreement.

2. Scope and Purpose.

2.1 Services. METRICS agrees to provide the Services in accordance with the terms and conditions of the applicable Work Statement or Quote.
METRICS may engage its employees, agents, other representatives, and any subcontractors and/or consultants approved in writing by
COMPANY (collectively, "METRICS Personnel") to provide the Services hereunder. METRICS will be solely responsible for any breach
of this Agreement by any of the METRICS Personnel, and for paying METRICS Personnel and providing any employee benefits that
they  are  owed.  Before  providing  Services  hereunder,  all  METRICS  Personnel  must  have  agreed  in  writing  to  (a)  confidentiality
obligations  with  respect  to  COMPANY  Confidential  Information  that  are  consistent  with  METRICS'  confidentiality  obligations  under
this Agreement and (b) effectively vest in METRICS any and all rights that such METRICS Personnel might otherwise have in the results
of their work, including all Work Product, such that METRICS is able to adhere to any of its obligations herein to assign such rights to
COMPANY.

2.2 Additional Services. METRICS agrees to provide additional services specified in any future Work Statements or Quotes that may be agreed to
and  executed  by  the  parties  in  writing,  incorporated  into  this  Agreement  and  attached  hereto  as  additional  schedules.  Each  Work
Statement or Quote shall be governed by the terms and conditions of this Agreement and by such supplementary written amendments of
this Agreement as may be, from time to time, agreed to between and executed by the parties. To the extent of any conflict between or
inconsistency  in  the  terms  and  conditions  of  this  Agreement  and  those  of  the  applicable  Work  Statement  or  Quote,  the  terms  and
conditions of this Agreement shall govern, except to the extent that the applicable Work Statement or Quote specifically and expressly
states that it is the intention of the parties that the terms and conditions of the applicable Work Statement or Quote shall govern.

2.3  Change  Orders.  COMPANY  may,  from  time  to  time,  submit  to  METRICS  a  written  request  for  changes  to  an  existing  Work  Statement  or
Quote. If, in METRICS' reasonable judgment, METRICS can implement the requested changes without requiring additional METRICS'
work, time, or resources and without materially affecting METRICS' ability to maintain the project schedule and comply with its other
obligations as set forth in such Work Statement or Quote, METRICS will provide COMPANY written notice thereof and will implement
the requested change at no additional cost to COMPANY. Otherwise, provided in METRICS' reasonable judgment it can implement the
requested  change,  METRICS  will  provide  COMPANY  with  a  written  change  order  proposal  for  the  additional  work,  time,  and/or
resources required to implement the requested change, including: (i) price change, (ii) impact on project schedule and compliance with
METRICS'  other  obligations  as  set  forth  in  such  Work  Statement  or  Quote,  and  (iii)  a  written  amendment  to  such  Work  Statement  or
Quote  reflecting  any  and  all  revisions  to  such  Work  Statement  or  Quote  required  to  implement  the  requested  change  (each,  a  "Work
Amendment"). COMPANY may, at its discretion, accept or reject METRICS' change order proposal, and shall provide METRICS with
written notice of its decision within fifteen (15) business days after its receipt of the applicable change order proposal; provided, however,
that, in any event, COMPANY will use reasonable efforts to respond as expeditiously as possible to any such change order proposals. If
COMPANY  does  not  respond  in  writing  to  METRICS'  change  order  proposal  within  such  fifteen  (15)  business  day  period  (or  any
mutually  agreeable  extensions  thereof),  either  by  way  of  acceptance  or  rejection  thereof  or  a  request  to  negotiate  the  terms  of  the
applicable Work Amendment, such Work Amendment immediately shall be null and void and of no legal effect and the original Work
Statement or Quote shall continue in full force and effect. Any and all changes and amendments to a Work Statement or Quote agreed to
by the parties pursuant to this Section 2.3 (Change Orders) shall be pursuant to a Work Amendment executed by both parties.

2.4  Materials  and  Information  Provided  by  COMPANY.  COMPANY  agrees  to  provide  METRICS  with  all  Materials  and  other  information  in
COMPANY's  possession  and  control  that  COMPANY  or  METRICS  reasonably  determines  are  necessary  to  or  reasonably  useful  for
METRICS' performance of any Services. COMPANY agrees to notify METRICS as to the fair market value of any such Materials that it
provides  to  METRICS  at  the  time  of  such  provision.  METRICS  hereby  agrees  that  the  Materials  are,  and  shall  remain,  the  exclusive
property  of  COMPANY.  METRICS  will  use  Materials  only  as  necessary  or  reasonably  useful  to  perform  the  Services.  COMPANY
represents  and  warrants  to  METRICS  that,  as  of  the  Effective  Date  and  at  all  times  during  the  Term,  no  Material  Safety  Data  Sheet
("MSDS") or specific safety or handling data are or will be applicable to any Materials provided by COMPANY to METRICS, except as
disclosed  to  METRICS  in  writing  in  advance  by  COMPANY  in  sufficient  time  for  review  and  training  by  METRICS  prior  to
COMPANY's provision thereof; provided, however, that, where appropriate or required by Applicable Laws, COMPANY will provide
METRICS with a MSDS and all related safety and handling data for any such Materials. METRICS agrees (i) to keep and maintain in its
custody  and  subject  to  its  control  in  secure  storage  at  the  Facility,  any  Materials  that  it  receives  during  the  Term,  (ii)  that  it  shall  not
transfer any Materials to any third party that is not specifically authorized by COMPANY in advance and in writing; (iii) to return or
surrender to COMPANY all unused quantities of Materials, to the extent in METRICS' custody or control at the time, upon termination of
this Agreement or otherwise upon written request by COMPANY.

2.5 Work Location. METRICS shall perform Services under the applicable Work Statement or Quote at the Facility, unless mutual agreement to

the contrary is set forth in a written amendment to such Work Statement or Quote executed by the parties.

2.6  Additional  COMPANY  Obligations.  Unless  otherwise  agreed  to  by  the  parties  in  writing,  COMPANY  shall  be  solely  responsible  for  (i)
providing  METRICS  with  any  scientific  data  that  COMPANY  possesses  or  is  able  to  obtain  using  commercially  reasonable  efforts  as
necessary for METRICS to perform the Services and (ii) if applicable, reviewing and approving in a timely manner any and all Product-
related master documents and timely approving any and all in  process and finished Product-related test results to ensure conformity of
such results with any and all applicable Product specifications. To avoid doubt, METRICS is not responsible for sourcing any scientific
data that COMPANY was unable to obtain using commercially reasonable efforts as necessary for METRICS to perform the Services.

2.7 Legal Compliance.

(a) METRICS will comply, and shall ensure that the Facility complies, in all material respects with all Applicable Laws in connection
with METRICS' operations and provision of the Services hereunder and under any Work Statement or Quote, including cGMPs.
Without limiting the foregoing, METRICS shall secure and maintain in good order, at its sole cost and expense, such current
governmental registrations, permits and licenses as are required by any Regulatory Authority in order for METRICS to conduct
the Services at the Facility under this Agreement.

(b) COMPANY and METRICS hereby acknowledge that the Services will need to comply with the Applicable Laws of the European
Union. In addition, in the event COMPANY provides written notice to METRICS of (i) any additional regulatory standards (not
contained within the Work Statement or Quote) that COMPANY wishes to apply to the performance of Services by METRICS
hereunder, including the laws, ordinances, rules and regulations of any country other than the United States and/or outside of the
European Union, or (ii) any additional specifications that COMPANY wishes to apply to Services that are not contained in the
Work Statement or Quote, but are required by an IND or comparable filing in any country other than the United States and/or
outside  of  the  European  Union  to  comply  with  the  laws,  ordinances,  rules  and  regulations  of  such  country,  then  Section  2.3
(Change  Orders)  will  apply.  The  parties  acknowledge  and  agree  that  a  change  to  comply  with  the  Applicable  Laws  of  a  new
jurisdiction  can,  in  some  cases,  be  unduly  onerous  (for  example,  Brazil).  If,  in  METRICS'  reasonable  judgment  it  cannot
implement  the  requested  change,  to  avoid  doubt,  METRICS  is  not  required  to  provide  COMPANY  a  written  change  order
proposal.

3. Compensation and Payment Terms.

3.1 Compensation for Services. Subject to Section 4, in consideration for the performance by METRICS of, and as compensation for, the Services,
COMPANY agrees to pay METRICS the amounts specified in any Work Statement or Quote. Unless otherwise agreed in the applicable
Work  Statement  or  Quote  and  subject  to  Section  4,  METRICS  will  invoice  COMPANY  on  a  monthly  basis,  COMPANY  shall  pay
METRICS' invoice within thirty (30) days after the date of receipt of such invoice unless COMPANY notifies METRICS in writing of a
disputed  invoice  amount,  in  which  case  the  parties  will  in  good  faith  discuss  and  seek  to  resolve  the  disputed  matter  as  promptly  as
possible;  provided,  however,  that,  in  the  event  that  COMPANY  has  not  established  prior  credit  with  METRICS,  COMPANY  may  be
subject to payment terms different from the foregoing, including up front deposits, until routine credit can be established. Any undisputed
invoices not paid in full within thirty (30) days of the date of the invoice will be subject to a service charge in an amount equal to the
lesser of (i) 1.5% per month or the (ii) maximum service charge percentage allowed under Applicable Laws, as applied to any overdue
amounts. Expenses or pass through items purchased by METRICS in support of Service performed under the applicable Work Statement
or  Quote  will  be  billed  to  COMPANY  by  METRICS  at  cost  plus  10%  for  items  up  to  $5,000  and  cost  plus  5%  for  items  exceeding
$5,000. METRICS will not purchase any one such item exceeding $2,000 without the COMPANY's prior written consent. In response to
a request by COMPANY, METRICS will provide reasonably detailed documentation in support of any such expenses. All references to
currency herein or in any Work Statement or Quote are deemed to be the lawful currency of the United States unless otherwise stated.

3.2  Payments  for  shipping  and  insurance.  Subject  to  the  terms  of  Section  4,  METRICS  shall  invoice  COMPANY,  and  COMPANY  shall  pay
METRICS, for any and all shipping and insurance in connection with the shipment of Deliverables and any and all sales, use, excise,
import,  customs,  gross  receipts,  compensating,  and  similar  taxes  (other  than  taxes  on  METRICS's  income)  incurred  by  METRICS  in
connection with the shipment of such Deliverables.

4. Third Party Intermediary.

4.1  COMPANY  has  engaged  METRICS  to  perform  certain  Services  described  in  certain  Work  Orders  and  Quotes  through  a  third  party
intermediary, Davos Chemical Corporation, a New Jersey corporation organized and existing under the laws of the State of New Jersey,
USA ("Davos"). The Parties agree that, for the purposes of this Agreement and each Work Statement or Quote, Davos

may  undertake  certain  activities  on  COMPANY's  behalf  as  described  in  Section  4.2.  This  may  include,  but  is  not  limited  to,  making
payments to METRICS in accordance with Section 4.2 below and issuing Change Orders on behalf of COMPANY in accordance with
Section 2.3.

4.2  To  the  extent  that  COMPANY  notifies  METRICS  in  writing  that  COMPANY  has  engaged  Davos  to  undertake  any  of  the  activities  on
COMPANY's behalf described in Section 4.1: (i) COMPANY shall provide METRICS with written notice which shall (a) describe the
activities to be undertaken by Davos (the "Davos Activities") and (b) represent to METRICS that Davos is authorized to undertake the
Davos Activities included in the written notice; and (ii) on and after the date of such notice, (a) COMPANY will submit all requests for
Work  Orders  and  Quotes  with  METRICS  through  Davos;  (b)  COMPANY  will  submit  all  Change  Orders  through  Davos;  and  (c)  all
payments owing to METRICS under any Work Order or Quote will be invoiced and paid for as follows: (A) METRICS shall prepare and
provide  to  Davos  an  invoice  on  a  monthly  basis,  made  out  to  Davos,  with  COMPANY's  name  referenced;  (B)  Davos  shall  notify
COMPANY of the amount(s) owing to METRICS and shall invoice COMPANY on a monthly basis; (C) COMPANY shall pay those
amounts to Davos within thirty (30) days after the date of receipt of such invoice unless COMPANY notifies Davos and METRICS in
writing  of  a  disputed  invoice  amount,  in  which  case  the  parties  will  in  good  faith  discuss  and  seek  to  resolve  the  disputed  matter  as
promptly as possible and otherwise in accordance with the terms of and in accordance with the timeframes set forth in Section 3 of this
Agreement; and (D) Davos shall promptly send any payment made to it by COMPANY to METRICS.

4.3  In  the  event  that  METRICS  does  not  receive  any  payment  for  Services  from  Davos  as  a  result  of  COMPANY's  failure  to  pay  Davos  in
accordance with Section 4.2, COMPANY agrees that METRICS may seek payment for the Services from COMPANY directly, including
any interest that would be payable under Section 3. In the event that COMPANY pays Davos in accordance with Section 4.2 but Davos
fails to pay METRICS in accordance with Section 4.2, METRICS agrees that METRICS shall seek payment for the Services solely from
Davos directly, including any interest that would be payable under Section 3.

5. Inspections; Records.

5.1 Inspections by COMPANY.  COMPANY  and  its  agents  or  representatives  (collectively,  "COMPANY  Inspectors")  shall  be  provided,  during
METRICS'  regular  hours  of  business,  reasonable  access  to  METRICS'  facility  to  (i)  perform  no  more  than  one  quality  assurance
inspection (not to exceed two auditors for two days) per calendar year, and (ii) to otherwise observe the performance of the Services, at
mutually  convenient  times  and  with  reasonable  notice;  provided,  however,  that  COMPANY  and  the  COMPANY  Inspectors  will  be
accompanied  by  one  or  more  Representatives  of  METRICS  at  all  times  during  any  such  inspection.  Notwithstanding  the  above,
COMPANY Inspectors shall be entitled to conduct additional "for cause" quality assurance inspections (not to exceed two days each) in
the  event  of  an  actual  violation  by  METRICS  of  (A)  any  Applicable  Laws,  or  (B)  the  terms  of  any  Quality  Agreement  or  Technical
Agreement  entered  into  by  the  parties  with  respect  to  any  Services.  METRICS  shall  reasonably  cooperate  with  the  COMPANY
Inspectors and shall make available for review by the COMPANY all documents specific to the Services that are required by COMPANY
to properly perform its inspections with regard to the performance of the Services. All documents, materials, data, and other information
provided or disclosed to, or any activities or events observed by, any COMPANY Inspector, or to which any COMPANY Inspector is
provided  access,  shall  constitute  METRICS  Confidential  Information  for  all  purposes  hereunder.  Prior  to  a  COMPANY  Inspector
engaging in any inspection or observance described in this Section 5.1 (Inspections by COMPANY), such COMPANY Inspector shall be
bound  to  COMPANY  by  enforceable  written  obligations  of  confidentiality  and  restricted  use  with  respect  to  METRICS  Confidential
Information that are at least as stringent as those imposed on COMPANY herein. All such COMPANY Inspectors shall comply with all
safety, security, and other applicable policies and procedures of METRICS, to the extent disclosed by METRICS to such COMPANY
Inspectors  in  writing  prior  to  such  inspection,  at  all  times  during  and  in  connection  with  any  such  inspections,  all  of  which  shall  be
conducted without unreasonable disruption to METRICS' normal business operations.

5.2 Inspections by Regulatory Authorities. METRICS shall notify COMPANY via email or otherwise in writing as soon as reasonably practicable
and to the extent not otherwise prohibited by Applicable Laws, of all communications from any Regulatory Authority relating in any case
to the

Services, including with respect to inspections or anticipated inspections of the Facility to be conducted by any Regulatory Authority that
is specific to the Services or that could otherwise be reasonably expected to have a material impact on the performance of the Services.
To the extent reasonably practicable and not otherwise prohibited by Applicable Laws, METRICS shall (a) keep COMPANY informed
on a timely basis with respect to any such inspections, and where possible permit COMPANY the opportunity to be present on-site during
(but not directly participate in) any such inspection, (b) promptly provide COMPANY with copies of any reports, citations, violations,
warnings, and notices of deficiency received by METRICS in connection with such inspections, (c) reasonably consult with COMPANY
prior  to  providing  information  which  relates  specifically  to  the  Services,  and  (d)  provide  to  COMPANY  a  copy  of  any  documents
produced  in  response  to  any  such  inspection,  purged  only  of  METRICS  Confidential  Information  that  is  unrelated  to  the  Services.
Notwithstanding  the  foregoing  in  this  Section  5.2  (Inspections  by  Regulatory  Authorities),  in  no  event  shall  any  inspections  by  a
regulatory authority outside the United States be permitted without the prior written consent of METRICS.

5.3 Records; Records Storage. METRICS will maintain all materials, data and documentation obtained or generated by METRICS in the course of
preparing for and providing Services hereunder ("Results"), including all computerized records and files reflecting all Work Product (the
"Records") in a secure area reasonably protected from fire, theft and destruction.

5.4 Record Retention. Upon written instruction of COMPANY, all Records will, at COMPANY's option either be (a) delivered to COMPANY or
to its designee in such form as is then currently in the possession of METRICS, (b) retained by METRICS for a period of five (5) years
after  the  Effective  Date  of  the  applicable  Work  Statement  or  Quote,  or  as  otherwise  required  by  Applicable  Laws,  or  any  Quality
Agreement or Technical Agreement entered into between the parties to the extent applicable to the Services, or (c) disposed of, at the
direction and written request of COMPANY, unless such Records are otherwise required by applicable law, rule, regulation, or order to be
stored or maintained by METRICS. METRICS may retain copies of any Records as are reasonably necessary for regulatory or insurance
purposes, subject to METRICS's obligation of confidentiality with respect thereto, if any, as set forth herein.

5.5 Reports.  METRICS  shall  keep  COMPANY  regularly  informed  of  the  progress  of  the  Services  in  accordance  with  its  standard  procedures.
Without limiting the generality of the foregoing, METRICS shall promptly, not less than once each calendar quarter during the Term (and
more  frequently  if  required  to  keep  COMPANY  sufficiently  informed),  provide  COMPANY  with  (i)  reports  in  reasonable  detail
regarding the status of METRICS's Services, (ii) all Results, Deliverables, or other Work Product generated, conceived, developed and/or
reduced  to  practice  in  the  performance  of  the  Services  and  (iii)  such  supporting  data  and  information  as  may  be  reasonably  requested
from time to time by COMPANY regarding such Services (each such report, a "Report"). COMPANY acknowledges and agrees that if
the specific reporting outlined in subsection (iii) above requires METRICS to provide information and updates in a manner exceeding its
usual practices, upon the written request of METRICS, the parties will discuss as to whether COMPANY will reimburse METRICS for
its incremental cost in complying with such obligation.

6. Shipping. Unless specified otherwise in any Work Statement or Quote, METRICS will supply Deliverables Ex Works (Incoterms 2010), the Facility. If
specified in any Work Statement or Quote, METRICS shall ship Deliverables to COMPANY or locations designated by COMPANY. METRICS
shall  be  responsible  for  arranging  all  shipping,  as  appropriate,  including  suitable  packaging  materials  to  comply  with  applicable  standards,
customs forms and insurance. Risk of loss shall transfer to COMPANY upon placement of the Deliverables in the hands of a carrier.

7. Delivery and Acceptance of Product. In the event that the terms of the applicable Work Statement or Quote call for METRICS to manufacture, package,
and deliver Product under cGMP conditions according to mutually agreed upon Product specifications ("Manufacturing Specifications"), the
following terms shall apply:

7.1  METRICS  shall  provide  COMPANY  with  reasonable  prior  written  notice  before  implementing  changes  in  the  site  at  which  Product  is
manufactured or the equipment, processes or procedures used to manufacture the Product; provided, however, that METRICS otherwise
shall remain obligated to manufacture such Product in accordance with the provisions of the applicable Work Statement or Quote. All
Product delivered to COMPANY shall be accompanied by (i) a quality

control certificate of analysis ("COA'') confirming that the Product covered by such COA meets the Manufacturing Specifications, and
(ii) a copy of the related batch record for the Product (collectively, the "Manufacturing Records"). METRICS shall retain copies of the
Manufacturing Records for such periods required by Applicable Laws.

7.2  Promptly  after  receipt  of  each  shipment  of  Product  and  the  accompanying  Manufacturing  Records,  COMPANY  shall  review  the
Manufacturing Records. If COMPANY determines, in good faith and its reasonable discretion, that any Product that is the subject of such
Manufacturing  Records  does  not  conform  to  the  applicable  Manufacturing  Specifications,  COMPANY  shall  provide  METRICS  with
written notice thereof within thirty (30) days following such receipt. Any such notice issued shall state in reasonably sufficient detail the
reason why COMPANY believes that the Product does not conform to the applicable Manufacturing Specifications.

7.3 METRICS shall have thirty (30) days to review any assertion by the COMPANY that Product failed to conform to applicable Manufacturing
Specifications. In the event that METRICS reasonably disagrees with any such assertion, representative samples of the batch of Product
in  question  shall  be  submitted  to  a  mutually  acceptable  independent  laboratory  or  consultant  (if  not  a  laboratory  analysis  issue)  for
analysis or review, the costs of which shall ultimately be paid by the party that is determined to have been incorrect in its determination
of whether the Product conforms to applicable Manufacturing Specifications.

7.4  If  any  Product  fails  to  conform  to  the  applicable  Manufacturing  Specifications  but  is  not  Non-Conforming  Product,  COMPANY  shall  be
responsible  for  the  cost  of  such  Product  and  METRICS  shall,  at  COMPANY's  discretion  upon  written  notice  to  METRICS,  prepare
additional  Product  that  conforms  to  the  applicable  Manufacturing  Specifications  as  soon  as  practicable  at  COMPANY's  sole  cost  and
expense. If any Product fails to conform to the applicable Manufacturing Specifications and is a Non-Conforming Product, Section 7.5
shall apply, METRICS shall be solely responsible for, and COMPANY shall not be required to pay for, the cost of such Non-Conforming
Product  (including  all  costs  and  expenses  associated  with  the  manufacturing  run  in  which  the  Non-Conforming  Product  was
manufactured and all costs and expenses applicable to the delivery of the Non-Conforming Product), and COMPANY shall have the right
to, and METRICS may require that COMPANY, return any such Non-Conforming Product to METRICS at METRICS' cost.

7.5  METRICS  shall  replace  Non-Conforming  Product  with  conforming  Product  ("Replacement  Product")  as  soon  as  reasonably  possible;
provided,  that,  if  additional  Materials  are  required  to  manufacture  Replacement  Product,  COMPANY  shall  use  reasonable  efforts  to
provide such Materials and METRICS shall reimburse COMPANY for its reasonable costs of obtaining such additional Materials, and, in
any case, within sixty (60) days from the time the non  conformance is determined. COMPANY shall otherwise pay for the cost of such
Replacement  Product,  provided  that  COMPANY  has  not  paid  for  the  cost  of  the  relevant  Non-Conforming  Product.  The  procedure
described  above  shall  be  repeated  for  any  such  Replacement  Product  that  COMPANY  believes  does  not  conform  to  applicable
Manufacturing Specifications.

8. Confidentiality.

8.1 Confidentiality and Restricted Use Obligations. Each party agrees to hold the Confidential Information of the other party in confidence and
further agrees not to use the other party's Confidential Information for any purpose other than to fulfill such party's obligations or exercise its
rights under this Agreement. Neither party shall disclose the other party's Confidential Information to any third party, other than:

(i)  to such party's affiliated companies and its and their employees, officers, directors, agents, other representatives, and consultants and
who have a need to know such Confidential Information in order to perform their obligations under this Agreement (collectively,
"Representatives"); and

(ii)  to investigators retained in connection with a study to which such Confidential Information relates;

in each case, who are under written obligations to maintain the confidentiality and restrict the use of the other party's Confidential Information to
at least the same extent required of such party hereunder.

8.2 Limitation. Notwithstanding any provision herein to the contrary, in the event that the receiving party becomes obligated by Applicable Laws,
to disclose such Confidential Information, or any portion thereof, to any governmental authority or applicable stock exchange, court, or
other  tribunal,  the  receiving  party  promptly  shall  notify  the  disclosing  party  thereof,  to  the  extent  reasonably  practicable  under  the
circumstances and not otherwise prohibited by Applicable Laws, so that the disclosing party may seek an appropriate protective order or
other remedy with respect to resisting or narrowing the scope of the required disclosure. In the absence of such a protective order or other
remedy, the receiving party shall limit any such disclosure to such portion of the Confidential Information as is legally required to be
disclosed and take reasonable steps in any such disclosure to have the entity requiring such disclosure to protect to the greatest extent
possible the confidentiality of all information so disclosed. Any such disclosure by the receiving party shall in no event otherwise change,
alter  or  diminish  the  confidential,  proprietary,  and/or  trade  secret  status  of  such  Confidential  Information,  or  treatment  as  such  by  the
receiving party, hereunder.

8.3 Return of Information. Upon the disclosing party's written request, the receiving party will promptly: (i) return and delete from the receiving
party's computer systems, or, at the disclosing party's option, destroy, all originals and copies, whether tangible, electronic, or other, of all
documents,  data,  materials,  and  other  information  thereof  in  the  receiving  party's  possession,  custody,  or  control  that  constitute
Confidential  Information  of  the  disclosing  party;  and  (ii)  provide  a  written  statement  to  the  disclosing  party  certifying  that  all  such
documents, data, materials, and other information have been so delivered or destroyed. For purposes of this section, "documents, data,
materials,  and  other  information"  includes  without  limitation  all  information  fixed  in  any  tangible  medium  of  expression,  in  whatever
form or format. The receiving party may keep a single copy of the Confidential Information of the disclosing party (subject to the terms
of this Agreement) solely for legal and compliance purposes.

8.4 Exclusions. Confidential Information does not include information that: (i) is approved for release by the prior written authorization of the
disclosing  party;  (ii)  was  already  lawfully  in  the  receiving  party's  possession  at  the  time  of  disclosure  by  the  disclosing  party  as
evidenced by written records; (iii) is or becomes  publicly  available  other  than  by  the  receiving  party's  violation  of  this  Agreement  or
other fault of the receiving party; (iv) is received by the receiving party from a third party  which,  to  the  knowledge  of  the  receiving
party after its reasonable inquiry and investigation, is rightfully in possession of such information free of any obligation to maintain its
confidentiality; or (v) is independently developed by or on behalf of the receiving party without reference to, benefit of, or reliance on
any Confidential Information of the disclosing party as evidenced by written records.

9. Ownership and Rights.

9.1 Work Product. The Parties hereby agree that (i) all Work Product (excluding any METRICS Technology and METRICS Improvements) shall
be  owned  exclusively  by  COMPANY;  (ii)  all  original  works  of  authorship  made  by  METRICS  within  the  scope  of  the  Services  it
provides  are  "works  made  for  hire,"  as  that  term  is  defined  in  the  United  States  Copyright  Act  (17  U.S.C.  §  101)  (excluding  any
METRICS Technology and METRICS Improvements), (iii) METRICS hereby assigns to COMPANY any and all of METRICS' right,
title,  and  interest  in  and  to  such  Work  Product  and  original  works  of  authorship;  (iv)  METRICS  reasonably  shall  cooperate  with
COMPANY, at COMPANY's sole cost and expense, in connection with any effort by COMPANY to obtain patent protection as may be
available for such Work Product, including by executing all applications for patents and/or copyrights, domestic and foreign, assignments
and  other  papers  necessary  to  secure  and  enforce  rights  related  to  the  Work  Product.  Notwithstanding  any  other  provisions  of  this
Agreement to the contrary, METRICS may withhold the provision of any Deliverables and Work Product under this Agreement in the
event of default of payment by COMPANY of any undisputed amounts due and owing to METRICS in accordance with this Agreement.

9.2  METRICS  Technology  and  METRICS  Improvements.  All  METRICS  Technology  and  METRICS  Improvements  shall  be  owned
exclusively by METRICS. COMPANY hereby assigns to METRICS any and all of COMPANY's right, title, and interest in and to the
METRICS Technology and METRICS Improvements. COMPANY reasonably shall cooperate with METRICS, at METRICS's sole cost
and expense, in connection with any effort by METRICS to obtain patent protection as may be available for any METRICS Technology
and METRICS Improvements. METRICS shall have the right to use and disclose METRICS Technology and METRICS Improvements
without restriction.

9.3 License  to  METRICS  Technology  and  METRICS  Improvements.  METRICS  hereby  grants  to  COMPANY  a  fully-paid,  perpetual,  limited,
non-exclusive  right  and  license  to  use  and  permit  COMPANY's  Representatives  to  copy,  display,  and  otherwise  use  the  METRICS
Technology  and  METRICS  Improvements  solely  for  the  purpose  of  exercising  its  rights  and  obligations  under  this  Agreement  and  as
reasonably required for the exploitation of the Work Product and the Deliverables.

9.4 License to Licensed Intellectual Property and Work Product. COMPANY hereby grants to METRICS a limited, fully paid, non-exclusive right
and license to use and permit METRICS' Representatives to copy, display, and otherwise use the Licensed Intellectual Property and the
Work  Product  during  the  term  of  this  Agreement solely for the purpose of performing  Services  and  carrying  out  its  other  tasks  and
responsibilities under the applicable Work Statement or Quote and as otherwise necessary to comply with the terms and conditions of this
Agreement.

9.5 Execution of documentation. Each party shall, and shall cause all of such party's Representatives to, execute any and all documents and take
any and all other actions reasonably requested by the other party, at such other party's sole cost and expense, to fully and finally vest in
such other party all such right, title, and interest in and to Work Product and original works of authorship, in the case of METRICS as
such  party,  and  METRICS  Improvements,  in  the  case  of  COMPANY  as  such  party,  in  accordance  with  the  applicable  provisions  of
Section 9.1 (Work Product) and 9.2 (METRICS Technology and METRICS Improvements), as the case may be.

10. Representations and Warranties.

10.1 COMPANY Representations and Warranties.  COMPANY  represents  and  warrants  to  METRICS  that  COMPANY  (i)  has  the  right  to  enter
into this Agreement; (ii) this Agreement has been duly executed and delivered on behalf of COMPANY and constitutes a legal, binding
and valid obligation, enforceable against COMPANY in accordance with its terms; (iii) is not a party to any existing agreements, grants,
licenses,  encumbrances,  obligations,  or  understandings,  written  or  oral,  inconsistent  with  this  Agreement;  (iv)  owns  or  controls  the
Licensed Intellectual Property; (v) has no actual knowledge of any claim by or otherwise available to any third party that  any  of  the
Licensed Intellectual Property or any use thereof by METRICS or any of METRICS's Representatives in accordance with the Agreement
infringes, misappropriates, or otherwise violates any Intellectual Property Rights of such third party or any other third party.

10.2 METRICS Representations and Warranties. METRICS represents and warrants to COMPANY that (i) METRICS has the right to enter into
this Agreement; (ii) this Agreement has been duly executed and delivered on behalf of METRICS and constitutes a legal, binding and
valid obligation, enforceable against METRICS in accordance with its terms; (iii) METRICS is not a party to any existing agreements,
grants,  licenses,  encumbrances,  obligations,  or  understandings,  written  or  oral,  inconsistent  with  this  Agreement;  (iv)  to  METRICS's
knowledge, its provision of the Services in accordance with this Agreement will not infringe, misappropriate, or otherwise violate any
Intellectual Property Rights of any third party; (v) METRICS will provide the Services in a professional and workmanlike manner and in
accordance  with  cGMP  and  all  other  Applicable  Laws;  (vi)  neither  it  nor  any  METRICS  Personnel  performing  Services  under  this
Agreement has been debarred, or convicted of a crime which could lead to debarment, under the  Generic  Drug  Enforcement  Act  of
1992, 21 United States Code §§335(a); (vii) to the extent that METRICS

manufactures  and  delivers  Product  under  this  Agreement,  as  of  the  date  of  each  such  delivery  (a)  all  batches  of  Product:  (A)  will  be
manufactured  in  conformance  with  the  Manufacturing  Specifications,  and  the  Manufacturing  Records  and  in  compliance  with  the
requirements of Applicable Laws; and (B) will be transferred free and clear of any liens or encumbrances of  any  kind  to  the  extent
arising through or as a result of the acts or omissions of METRICS, its Affiliates or their respective agents. Without limiting Section 10.4,
METRICS does not make any representations or warranties regarding any Materials provided by COMPANY under this Agreement.

10.3 Mutual Representations and Warranties. Each party represents and warrants to the other party that such party will hold, use and/or dispose

of any product and/or other materials involved in this Agreement in accordance with all Applicable Laws.

10.4  NO  OTHER  REPRESENTATIONS.  EXCEPT  FOR  THE  FOREGOING  RESPECTIVE  REPRESENTATIONS  AND  WARRANTIES
MADE BY THE PARTIES IN THIS SECTION 10 (REPRESENTATIONS AND WARRANTIES), NEITHER PARTY MAKES ANY,
AND  EACH  PARTY  HEREBY  DISCLAIMS  ALL,  OTHER  REPRESENTATIONS  OR  WARRANTIES  IN  CONNECTION  WITH
THIS  AGREEMENT.  THE  EXPRESS  REPRESENTATIONS  AND  WARRANTIES  STATED 
IN  THIS  SECTION  10
(REPRESENTATIONS  AND  WARRANTIES)  ARE  IN  LIEU  OF  ALL  OTHER  REPRESENTATIONS  AND  WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE, SYSTEM INTEGRATION, DATA ACCURACY, AND QUIET ENJOYMENT.

11. Limitation of Liability.

11.1 SUBJECT TO SECTION 11.3, IN NO EVENT SHALL EITHER PARTY BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
CONSEQUENTIAL  OR  PUNITIVE  DAMAGES,  OR  LOST  PROFITS,  LOSS  OF  REVENUE,  COST  OF  CAPITAL,  LOSS  OF
BUSINESS OR DOWNTIME, EVEN IS SUCH PARTY HAD BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

11.2  SUBJECT  TO  SECTION  11.3,  IN  NO  EVENT  SHALL  EITHER  PARTY'S  AGGREGATE  LIABILITY  IN  CONNECTION  WITH  THE
TRANSACTIONS  CONTEMPLATED  UNDER  THIS  AGREEMENT  EXCEED  THE  TOTAL  AMOUNTS  ACTUALLY  PAID  TO
METRICS  HEREUNDER  DURING  THE  12-MONTH  PERIOD  IMMEDIATELY  PRECEDING  THE  EVENT  GIVING  RISE  TO
SUCH LIABILITY.

11.3  THE  LIMITATIONS  IN  SECTION  11.1  AND  11.2  SHALL  NOT  APPLY  IN  CONNECTION  WITH  THE  PARTIES'  RESPECTIVE
INDEMNIFICATION  OBLIGATIONS  UNDER  SECTION  12  (INDEMNIFICATION),  GROSS  NEGLIGENCE,  WILLFUL
MISCONDUCT  OR  FOR  REASONABLY  FORESEEABLE  LOSS  OF  PROFIT  SUFFERED  AS  A  DIRECT  RESULT  OF  A
BREACH  OF  RESTRICTIONS  ON  USE  OR  DISCLOSURE  OF  CONFIDENTIAL  INFORMATION  OR  MISUSE  OF
INTELLECTUAL PROPERTY RIGHTS.

11.4  THE  PROVISIONS  OF  THIS  SECTION  11  (LIMITATION  OF  LIABILITY)  SHALL  APPLY  REGARDLESS  OF  THE  FORM  OF
ACTION,  DAMAGE,  CLAIM,  LIABILITY,  COST,  EXPENSE  OR  LOSS,  WHETHER  IN  CONTRACT,  STATUTE,  TORT  OR
OTHERWISE.

12. Indemnification.

12.1 Indemnification by COMPANY. COMPANY hereby agrees to defend, indemnify, and hold harmless METRICS, its affiliated companies, and
its and their Representatives from and against any and all third party claims, demands, actions, suits, and other proceedings (collectively,
"Claims"),  and  all  resulting  losses,  damages,  liabilities,  settlements,  judgments,  costs,  and  expenses  (including  without  limitation
reasonable attorneys' fees) (collectively "Losses"), arising

from  or  in  connection  with:  (i)  the  breach  by  COMPANY  of  any  provisions  of  this  Agreement;  (ii)  any  allegations  that  the  use  by
METRICS  of  any  Licensed  Intellectual  Property  or  any  Product  in  accordance  with  this  Agreement  infringes,  misappropriates,  or
otherwise violates the Intellectual Property Rights of any third party; (iii) COMPANY's manufacture, sale, promotion, development, use,
licensing, sublicensing, marketing or distribution of any Deliverables or the Product, that is, in any case, the subject of any Services; (iv)
use by any end-user of any Product provided by COMPANY to such end-user; (v) the use by METRICS of the Materials in accordance
with  the  MSDS  and  any  written  safety  and  handling  information  provided  by  COMPANY  to  METRICS  regarding  the  Materials;  (vi)
COMPANY's  failure  to  comply  with  Applicable  Laws;  (vii)  any  acts  or  omissions  of  any  Representatives  of  COMPANY  or  any
COMPANY Inspectors, which, if performed or not performed, as the case may be, by COMPANY, would constitute a breach of or default
under  this  Agreement  by  COMPANY;  and  (viii)  COMPANY's  negligent  acts  or  omissions  or  willful  misconduct.  Notwithstanding  the
above, COMPANY shall not be obligated to defend, indemnify or hold harmless METRICS hereunder for any Claims against or Losses
incurred by METRICS, to the extent resulting from a breach by METRICS of any provision of this Agreement or the gross negligence or
willful misconduct of METRICS.

12.2 Indemnification  by  METRICS.  METRICS  hereby  agrees  to  defend,  indemnify  and  hold  harmless  COMPANY  and  its  directors,  officers,
employees and agents from and against any and all Claims and Losses arising from or in connection with: (i) the breach by METRICS of
any provisions of this Agreement; (ii) the failure by METRICS to handle and use Materials in accordance with the MSDS and any written
safety  and  handling  information  provided  by  COMPANY  to  METRICS;(  iii)  METRICS's  negligent  acts  or  omissions  or  willful
misconduct;  (  iv)  METRICS's  failure  to  comply  with  Applicable  Laws;  and  (  v)  any  acts  or  omissions  of  any  Representatives  of
METRICS,  including  any  METRICS  Personnel,  which,  if  performed  or  not  performed,  as  the  case  may  be,  by  METRICS,  would
constitute a breach of or default under this Agreement by METRICS. Notwithstanding the above, METRICS shall not be obligated to
defend,  indemnify  and  hold  harmless  COMPANY  hereunder  for  any  Claims  against  or  Losses  incurred  by  COMPANY,  to  the  extent
resulting from a breach by COMPANY of any provision of this Agreement or the gross negligence or willful misconduct of COMPANY.

12.3  Indemnification  Procedure.  A  party  intending  to  claim  indemnification  under  this  Agreement  ("Indemnitee")  shall  promptly  notify  the
indemnifying  party  ("Indemnitor")  in  writing  of  any  Claims  or  Losses  in  respect  of  which  the  Indemnitee  intends  to  claim  such
indemnification; provided, however, that any failure by the Indemnitee to provide such prompt notice shall not affect such Indemnitee's
rights to indemnification hereunder, if such failure to deliver notice does not materially prejudice the Indemnitor's ability to defend such
Claim  and  otherwise  discharge  its  indemnification-related  obligations  hereunder.  The  Indemnitee  reasonably  shall  cooperate  with  the
Indemnitor  in  the  defense  of  the  Claim,  and  the  Indemnitor  shall  have  the  right  to  control  the  defense  and/or  settlement  of  the  claim;
provided, however, that any such settlement shall not require the Indemnitee to admit any liability or pay any amounts without the prior
written consent of such Indemnitee. The Indemnitee shall use reasonable efforts to mitigate any Losses.

13. Term, Termination and Survival.

13.1 Term. This  Agreement  shall  be  effective  upon  the  date  specified  at  the  beginning  of  this  Agreement  and,  subject  to  earlier  termination  in
accordance  with  the  provisions  hereof,  shall  continue  for  three  (3)  years  ("Term").  Notwithstanding  the  foregoing,  the  terms  and
conditions of this Agreement shall not expire, but shall continue in full force and effect to the extent of their incorporation into any then‐ 
pending Work Statements or Quotes, until termination or expiration of the last to expire (or terminate) of such Work Statements or Quotes
in accordance with its terms.

13.2 Termination by COMPANY for Convenience. This Agreement or any individual Work Statement or Quote hereunder, may be terminated by
COMPANY  for  any  or  no  reason  upon  thirty  (30)  days  written  notice  to  METRICS.  The  termination  of  this  Agreement  shall  also
terminate  any  outstanding  Work  Statements  or  Quotes  and  all  Services  to  be  conducted  under  such  Work  Statements  or  Quotes.
Termination under this Section 13.2 (Termination by COMPANY for Convenience) shall not relieve COMPANY of its obligation to pay
for any Services completed prior to the effective date of such termination (which date shall be on or after the date of METRICS' receipt
of COMPANY's notice of termination).

13.3 Termination  for  Breach  of  the  Agreement.  This  Agreement  may  be  terminated  in  its  entirety  in  the  event  of  a  material  breach  by  a  party
hereto which is not cured within thirty (30) days (or if such breach cannot be cured within thirty (30) days, such other period of time as
the parties may mutually agree in writing) after receipt of written notice from the non-breaching party, specifying in reasonable detail the
nature of such breach. In the event the breach is not cured within such cure period, the non-breaching party may terminate this Agreement
as set forth in the notice from such non-breaching party; provided, however, that this Agreement shall not be terminated prior to the end
of the cure period. In such instance all then-pending Work Orders or Quotes shall be terminated as of the effective date of the termination.
In the event that any such breach is not reasonably susceptible of cure, this Agreement shall terminate immediately upon receipt of such
notice by the breaching party.

13.4 Effect of Termination or Expiration.  Upon  termination  or  expiration  of  this  Agreement,  neither  METRICS  nor  COMPANY  will  have  any
further obligations hereunder, except that (a) the terms and conditions of this Agreement shall remain in effect to the extent provided in
13.5 (Survival), (b) unless otherwise instructed by COMPANY, METRICS will terminate all Services in progress in an orderly manner as
soon as practical and in accordance with a schedule agreed to by COMPANY, (c) METRICS will deliver to COMPANY any Materials,
Deliverables and Work Product in its possession or control and all Product produced through termination or expiration, (d) METRICS
will  refund  to  COMPANY  any  monies  paid  in  advance  by  COMPANY  to  METRICS  in  anticipation  of  Services  not  performed  by
METRICS,  and  (e)  unless  COMPANY  has  terminated  pursuant  to  Section  13.3  (Termination  for  Breach  of  the  Agreement),  (1)
COMPANY will pay METRICS any and all monies due and owing METRICS, up to the time of termination or expiration, for Services
actually performed; and (2) METRICS shall be entitled to reimbursement, and COMPANY shall reimburse METRICS, for any and all
costs and expenses that have been or will be incurred by METRICS in connection with non-cancellable third party commitments entered
into by METRICS to conduct any Services pursuant to any then-pending Work Statements or Quotes and any and all materials purchased
by METRICS on account of any such Services; provided, however, that METRICS shall provide COMPANY, at COMPANY's written
request, written documentation in support of any such expenses, costs, and materials purchases and METRICS' inability to cancel any
such commitments.

13.5 Survival. In the event of any termination of this Agreement, Section 1 (Definitions), 3 (Compensation and Payment Terms), 4 (Third Party
Intermediary),  8  (Confidentiality),  9  (Ownership  and  Rights),  11  (Limitation  of  Liability),  12  (Indemnification),  and  13  (Term,
Termination and Survival) and 14 (Miscellaneous) and Section 2.4 hereof shall survive termination of this Agreement. Sections 5.2, 5.3,
and 5.4 shall survive for the periods required by applicable law, rule, regulation, or order.

14. Miscellaneous.

14.1 Force Majeure. Either party shall be excused from delays in performing or from its failure to perform hereunder to the extent that such delays
or  failures  result  from  causes  beyond  the  reasonable  control  of  such  party,  including  without  limitation,  acts  of  God,  fires,  floods,  or
weather;  strikes  or  lockouts,  shortage  of  raw  materials/packaging  components,  breakage  or  failure  of  machinery  or  apparatus,  factory
shutdowns,  embargoes,  wars,  hostilities  or  riots,  and  shortages  in  transportation;  provided  that,  in  order  to  be  excused  from  delay  or
failure to perform, such party must (i) provide written notice of such cause to the other party promptly after such party becomes aware of
such cause and (ii) act diligently, to the extent reasonably practicable and not otherwise prohibited by applicable law, rule, regulation, or
order, to mitigate the effect of such delay or failure. If such delay or failure continues for 180 days, then either party may terminate by
notice to the other party with immediate effect.

14.2 No Agency. METRICS, in rendering performance under this Agreement, is acting solely as an independent contractor, and in no event shall
the relationship of the parties hereunder constitute a partnership, joint venture, or agency. In no way is METRICS to be construed as the
agent or acting as the agent of COMPANY in any respect, any other provisions of this Agreement notwithstanding.

14.3    Multiple Counterparts.  This  Agreement  may  be  executed  in  several  counterparts,  all  of  which  taken  together  shall  constitute  one  single

Agreement between the parties.

14.4 Section Headings, Schedules. The section and subsection headings used herein are for reference and convenience only, and shall not enter
into the interpretation hereof. The schedules referred to herein and attached hereto, or to be attached hereto, are incorporated herein to the
same extent as if set forth in full herein.

14.5 Required Approvals. Where agreement, approval, acceptance, or consent by either party is required by any provision of this Agreement, such

action shall not be unreasonably withheld, delayed, or conditioned.

14.6 No Waiver. No delay or omission by either party hereto to exercise any right or power occurring upon any noncompliance or default by the
other party with respect to any of the terms of this Agreement shall impair any such right or power or be construed to be a waiver thereof.
A  waiver  by  either  of  the  parties  hereto  of  any  of  the  covenants,  conditions,  or  agreements  to  be  performed  by  the  other  shall  not  be
construed to be a waiver of any succeeding breach thereof or of any covenant, condition, or agreement herein contained. Unless stated
otherwise,  all  remedies  provided  for  in  this  Agreement  shall  be  cumulative  and  in  addition  to  and  not  in  lieu  of  any  other  remedies
available to either party at law, in equity, or otherwise.

14.7 Authority of METRICS. METRICS has the sole right and obligation to supervise, manage, contract, direct, procure, perform, or cause to be
performed all Services and other work to be performed by and on behalf of METRICS hereunder unless otherwise provided herein.

14.8 Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware without resort to

the choice of law principles thereof.

14.9 Entire Agreement. This Agreement and the schedules annexed hereto constitute the entire agreement between the parties. No change, waiver,
or discharge hereof shall be valid unless it is in writing and is executed by the party against whom such change, waiver, or discharge is
sought to be enforced. Neither this Agreement nor any Work Statement or Quote may be amended except in a writing executed by duly
authorized representatives of both parties. To the extent of any conflict between or inconsistency in the confidentiality-related terms and
conditions of this Agreement and the terms and conditions of any confidentiality agreement executed by the parties relating to the subject
matter of this Agreement, the confidentiality  related terms and conditions of this Agreement shall govern.

14.10 Notices. Under this Agreement if one party is required to give notice to the other, such notice shall be deemed given if mailed by U.S. mail,

first class, postage prepaid, and addressed as follows (or as subsequently noticed to the other party):

If to METRICS: Metrics Contract Services, 1240 Sugg Parkway, Greenville North Carolina 27834 Attention: President
If  to  COMPANY:  X4  Pharmaceuticals,  Inc.  Cambridge  Innovation  Center  One  Broadway  Cambridge,  MA  02142  Attention:  Chief
Executive Officer

14.11 No Assignment. Neither party may, without the prior written consent of the other party, assign or transfer this Agreement or any obligation
incurred  hereunder,  except  to  an  Affiliate  or  by  merger,  reorganization,  consolidation,  or  sale  of  all  or  substantially  all  of  such  party's
capital stock or assets to which this Agreement relates. Any attempt to do so in contravention of this Section 14.11 (No Assignment) shall
be void and of no force and effect.

14.12  Arbitration.  Any  dispute,  controversy  or  claim  (including,  without  limitation,  any  claim  based  on  warranty,  contract,  negligence,
misrepresentation, statute or other basis) arising out of or relating to this Agreement or its performance or breach ("Dispute") shall first be
referred to a senior executive of each party for resolution. If each party's respective representatives cannot resolve the

Dispute within thirty (30) days, then either party may refer the Dispute to be settled by binding arbitration.

(a) The arbitration shall be conducted under the auspices of the American Arbitration Association in accordance with its Commercial Arbitration
Rules, or where the Company is domiciled outside the United States, in accordance with its International Rules, in each case that are in
effect at the time arbitration is demanded and as set forth herein. In the event of a conflict between the procedures set forth herein and the
Rules, these procedures shall take precedence.

(b) The dispute shall be heard and decided by a single arbitrator.

(c )  The arbitrator(s) shall allow the parties to obtain discovery as may  reasonably  be  requested  by  a  party,  including  use  of  interrogatories,

document requests, depositions, subpoenas and inspections of things or land.

(d)  The arbitration hearing shall be held in Washington DC at a location and time to be mutually agreed upon by  the  parties,  or  if  they  are
unable to decide, then at a location and time determined by the arbitrator(s). The arbitration hearing shall be conducted over the course of
consecutive business days and weeks until it is concluded.

(e)  All proceedings shall be conducted in the English language and the arbitrators shall be fluent in English. All evidence, whether documentary
or testimonial, shall be presented in English. In the event testimony is given by a witness who is unable to testify in English, the party
proffering the testimony at the hearing (or obtaining the testimony in a deposition) shall provide a translator and shall bear that expense.
In the event a document offered as an exhibit is not in English, the party offering the exhibit shall provide a translated version of the
document.

(f)  The  hearing  shall  be  recorded  stenographically  and  a  transcript  prepared  if  requested  by  either  party.  The  expense  of  same  shall  be  borne
equally by the parties. Not less than ten (10) days prior to the hearing, the parties shall submit briefs to the arbitrator(s) setting for the
each  parties'  contentions  concerning  the  facts  and  the  law.  Within  thirty  (30)  days  following  the  close  of  the  hearing,  the  parties  shall
submit post-hearing briefs to the arbitrator(s). Within thirty (30) days after the timely submission of post-hearing briefs, the arbitrator(s)
shall enter a written award concisely setting forth the grounds for the decision.

(g)  The arbitrators shall decide the dispute by applying the law selected by the parties in this Agreement.

(h)  The decision of the arbitrator(s) shall be final and binding and any award rendered thereon may be entered in any court having jurisdiction,
and  the  parties  expressly  agree  that  the  state  and  federal  courts  located  in  the  State  of  Delaware  have  jurisdiction  to  confirm  the
arbitration  award  and  enter  judgment  thereon.  The  parties  hereby  waive  any  and  all  objections  and  defenses  to  such  jurisdiction
regardless of the nature of such objection or defense.

14.13 Non-Solicitation  of  Employees.  During  the  Term  and  for  one  (1)  year  thereafter,  each  party  ("Restricted  Party")  agrees  not  to  solicit  or
induce any employee of the other party with whom the Restricted Party had contact in connection with any of the Services to terminate
an  employment  relationship  with  the  other  party.  The  foregoing  shall  not  apply  to  general  solicitations  for  employment  (including,
without  limitation,  advertisements  in  newspapers,  trade  journals,  employment  websites,  the  Restricted  Party's  website,  and  recruiting
agency effo1is) not specifically directed towards employees of the other party.

14.14  Publicity. Neither party will make any press release or public disclosure regarding this Agreement or the transactions contemplated herein
without  the  other  party's  express  prior  written  consent,  except  as  required  by  applicable  law,  rule,  regulation,  or  order  or  by  any
governmental agency or applicable stock exchange, in which case the party required to make the press release or public disclosure shall
use commercially reasonable efforts to obtain the approval of the other party as to

the form, nature and extent of the press release or public disclosure prior to making the public disclosure.

METRICS, INC., DBA

METRICS CONTRACT SERVICE

By: /s/ John Ross

Print: John Ross

Title: EVP, Metrics Contract Services

X4 PHARMACEUTICAL, INC.:

By: /s/ Paula M. Ragan

Print: John Ross

Title: CEO

Date: September 11, 2015

Date: September 9, 2015

43237558v.1

AMENDMENT No. 1 TO THE MASTER SERVICES AGREEMENT RECITALS

Exhibit 10.36

This Amendment No. 1 (the “Amendment”) is made as of August 25th, 2017 (“Effective Date”) by and between Mayne Pharma Inc. (formerly known as
Metrics,  Inc.),  doing  business  as  Metrics  Contract  Services,  a  North  Carolina  corporation,  having  a  principal  place  of  business  at  1240  Sugg  Parkway,
Greenville, NC 27834 (“Metrics”) and X4 Pharmaceuticals Inc., a Delaware corporation with a business address at 955 Massachusetts Avenue, Fourth
Floor, Cambridge, MA 02139 (“Company”).

RECITALS

Whereas  Metrics  and  Company  entered  into  a  Master  Services  Agreement  for  the  provision  of  certain  pharmaceutical  development  services  dated
September 10, 2015 (the “Agreement”); and

Whereas the parties desire to amend the Agreement to, among other things, eliminate the role of Davos as third party intermediary in the generation of
Work Orders, Change Orders and the payment process.

Now, therefore,  for  good  and  valuable  consideration,  the  receipt  and  sufficiency  of  which  is  hereby  acknowledged,  the  parties  hereto,  intending  to  be
legally bound, hereby agree as follows:

1. Capitalized terms not otherwise defined herein will have the meaning given them in the Agreement.

2. Section 4 of the Agreement is deleted in its entirety and replaced with the words: “4. Not used.”.

3. Section 14.10 of the Agreement (“Notices”) is updated to reflect a change in the Company’s business address:

If to Company: X4 Pharmaceuticals, Inc.

955 Massachusetts Avenue, 4th Floor Cambridge, MA 02139
Attn: Chief Executive Officer

4. Incorporation and Effect of Amendment. Upon execution, this Amendment shall be made a part of the Agreement and shall be incorporated by reference.
Except as specifically set forth in this Amendment, the Agreement shall remain in full force and effect without change. In the event that there is a
conflict between the terms of the Agreement and this Amendment, the terms of this Amendment shall prevail.

5. Authorized Signatories. All signatories to this Amendment represent that they are authorized by their respective companies to execute and deliver this

Amendment on behalf of their respective companies, and to bind such companies to the terms herein.

6. Counterparts.  This  Amendment  may  be  executed  in  any  number  of  counterparts,  each  of  which  will  be  deemed  an  original  but  all  of  which  together
constitute  a  single  instrument.  Signatures  to  this  Amendment  transmitted  by  facsimile  transmission,  by  electronic  mail  in  “portable  document
format” (“.pdf”) form, or by any other electronic means intended to preserve the originals graphic and pictorial appearance of a document, will
have the same effect as physical delivery of the paper document bearing the original signatures, and shall be deemed original signatures by the
parties.

IN WITNESS WHEREOF, the parties hereto have agreed to this Amendment by signing below.

X4 PHARMACEUTICALS, INC.

By:

Name:

Title:

Date:

/s/ John Celebi

John Celebi

Chief Operating Officer

October 11, 2017

MAYNE PHARMA INC., DBA METRICS CONTRACT
SERVICES

By:

Name:

Title:

Date:

/s/ Kimberly McClintock

Kimberly McClintock

Executive Vice President

11-Oct-2017

AMENDMENT No. 2 TO THE MASTER SERVICES AGREEMENT

This  Amendment  No.  2  (the  “Amendment”)  is  made  as  of  February  28th,  2020  (“Effective  Date”)  by  and  between  Mayne  Pharma  Inc.
(formerly known as Metrics, Inc.), doing business as Metrics Contract Services, a North Carolina corporation, having a principal place of business at 1240
Sugg Parkway, Greenville, NC 27834 (“Metrics”) and X4 Pharmaceuticals Inc., a Delaware corporation with a business address at 955 Massachusetts
Avenue, Fourth Floor, Cambridge, MA 02139 (“Company”).

Exhibit 10.37

RECITALS

Whereas Metrics and Company entered into that certain Master Services Agreement for the provision of pharmaceutical development services

dated September 10, 2015, as amended (by Amendment No. 1) on August 25, 2017 (the “Agreement”); and

Whereas the parties desire to amend the Agreement to, among other things, renew the Term of the Agreement.

Now, therefore, for good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto, intending

to be legally bound, hereby agree as follows:

1. Despite the expiration of the Term of the Agreement on September 10, 2018, the parties have continued to perform their respective obligations for
Work Orders in effect in accordance with the terms and conditions of the Agreement. Therefore, in accordance with Section 13.1, the Agreement
continued in full force and effect.

2. Since  September  10,  2018,  Company  has  continued  to  pay  in  full  all  invoices  submitted  by  Metrics  in  accordance  with  the  terms  of  the
Agreement.  For  the  avoidance  of  doubt,  the  parties  agree  that  such  invoices  are  a  part  of  the  Agreement  and  the  terms  and  conditions  of  the
Agreement have governed over such invoices since the effective date of the Agreement.

3. The Term is extended for five (5) years to a total eight (8) year Term and the Agreement shall expire on September 10, 2023.

4. Capitalized terms not otherwise defined herein will have the meaning given them in the Agreement.

5.

Incorporation and Effect of Amendment. Upon execution, this Amendment shall be made a part of the Agreement and shall be incorporated by
reference. Except as specifically set forth in this Amendment, the Agreement shall remain in full force and effect without change. In the event that
there is a conflict between the terms of the Agreement and this Amendment, the terms of this Amendment shall prevail.

6. Authorized Signatories. All signatories to this Amendment represent that they are authorized by their respective companies to execute and deliver

this Amendment on behalf of their respective companies, and to bind such companies to the terms herein.

7. Counterparts.  This  Amendment  may  be  executed  in  any  number  of  counterparts,  each  of  which  will  be  deemed  an  original  but  all  of  which
together constitute a single instrument. Signatures to this Amendment transmitted by electronic mail in “portable document format” (“.pdf”) form,
or by any other electronic means intended to preserve the originals graphic and pictorial appearance of a document, will have the same effect as
physical delivery of the paper document bearing the original signatures, and shall be deemed original signatures by the parties.

IN WITNESS WHEREOF, the parties hereto have agreed to this Amendment by signing below.

X4 PHARMACEUTICALS, INC.

MAYNE PHARMA INC., DBA METRICS CONTRACT SERVICES

By: /s/ Derek Meisner

Name: Derek Meisner

Title: General Counsel

Date: 2/28/2020

By:

/s/ John Ross

Name:

John Ross

Title:

Date:

John Ross-President

2/28/2020

MASTER SERVICES AGREEMENT

Exhibit 10.38

This  Master  Services  Agreement  (this  “Agreement”)  is  made  effective  as  of  February  19,  2016  (the  “Effective  Date”),  by  and  between  X4
Pharmaceuticals,  Inc.,  a  Delaware  corporation  with  a  business  address  at  784  Memorial  Drive,  Suite  140,  Cambridge,  MA  02139  (“X4”),  and  Aptuit
(Oxford)  Limited  incorporated  in  England  and  Wales,  having  an  address  at  111  Innovation  Drive,  Milton  Park,  Abingdon,  Oxfordshire,  OX14  4RZ,
England (the “Company”). X4 and the Company are each sometimes hereinafter referred to individually as a “Party” and collectively as the “Parties.”

WHEREAS, X4 is developing a portfolio of proprietary drug candidates, including its proprietary lead compound, X4P-001, as oral therapeutic agents for
the treatment of serious diseases; and

WHEREAS, the Company has process development, manufacturing and related services experience and expertise and owns a facility that has proven to be
suitable for the development of a manufacturing process for X4’s proprietary compounds and for the large-scale manufacturing of such Compounds (as
defined below); and

WHEREAS, X4 desires to have the Company develop manufacturing processes and/or conduct large scale manufacturing campaigns for Compounds such
as X4P-001 on the terms and subject to the conditions set forth in this Agreement, as requested from time to time by X4.

NOW, THEREFORE, in consideration of the mutual covenants contained herein, and for other good and valuable consideration, the receipt and adequacy
of which are hereby acknowledged, the Parties hereby agree as follows:

1. DEFINITIONS

Whenever used in the Agreement with an initial capital letter, the terms defined in this Article 1 shall have the meanings specified and may be

used in singular or plural.

1.1 “Additional Services”  means  (a)  any  services  that  are  not  contained  in  a  Statement  of  Work  and  that  require  a  Change  Order  in  order  to
authorize the Company to commence the same and (b) any other service that is specifically identified as an Additional Service in this Agreement.

1.2 “Affiliate”  means,  with  respect  to  any  Party,  any  other  person  or  entity  that,  directly  or  indirectly,  controls  or  is  controlled  by  or  is  under
common control with, such Party. For purposes of this definition, “control” means (a) ownership of fifty percent (50%) or more of the shares of
stock entitled to vote for the election of directors in the case of a corporation or fifty percent (50%) or more of the equity interests in the case of
any other type of legal entity, (b) status as a general partner in any partnership, or any other arrangement whereby a person or entity controls or has
the right to control the board of directors of a corporation or equivalent governing body of an entity other than a corporation.

1.3 “API” means the active pharmaceutical ingredient that is intended to be used in the manufacture of a pharmaceutical product.

1.4 “Applicable Laws” means federal, state, local, national and international laws, statutes, rules and regulations, including any rules, regulations
or  requirements  of  any  Regulatory  Authority  within  the  Territory,  that  are  in  effect  from  time  to  time  during  the  Term  and  are  applicable  to  a
particular activity conducted hereunder.

1.5  “Approved  Subcontractor”  means  any  Third  Party  with  which  the  Company  contracts  to  perform  any  Services  or  meet  any  of  its  other
obligations under this Agreement to the extent consented to by X4 as part of a Statement of Work.

1.6 “Business Day” means any day other than a Saturday or Sunday on which banking institutions in Boston, Massachusetts or Oxford, England
are open for business.

1.7  “Calendar  Quarter”  means  the  period  beginning  on  the  Effective  Date  and  ending  on  the  last  day  of  the  calendar  quarter  in  which  the
Effective Date falls, and thereafter each successive period of three (3) consecutive calendar months ending on March 31, June 30, September 30 or
December 31.

1.8 “Calendar Year” means the period beginning on the Effective Date and ending on December 31 of the calendar year in which the Effective
Date falls, and thereafter each successive period of twelve (12) months commencing on January 1 and ending on December 31.

1.9 “CFR” means the Code of Federal Regulations of the United States.

1.10  “cGCP”  means  the  then-current  good  clinical  practice  applicable  to  the  conduct  of  Services  under  Applicable  Laws,  including  without
limitation the ICH guidelines and U.S. Good Clinical Practice.

1.11 “cGMP” means the laws, regulatory requirements and guidelines for then-current good manufacturing practices as described in (a) 21 CFR
Parts 210 and 211 and all applicable rules, regulations, orders and guidance published thereunder; (b) the then-current International Conference on
Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use, Guidance for Industry Q7A Good Manufacturing
Practice  Guidance  for  Active  Pharmaceutical  Ingredients;  (c)  EC  Directive  2003/94/EC  and  the  Rules  Governing  Medicinal  Products  in  the
European Union, Volume 4; the World Health Organization (WHO) “Guide to good manufacturing practice (GMP) requirements”; the laws of any
other  jurisdiction  within  the  Territory;  and  (f)  any  successor  provision  of  any  of  the  foregoing;  in  each  case,  as  such  laws,  regulations  and
guidelines are amended from time to time.

1.12    “Change  Order”  means  a  document  approved  in  writing  by  the  Parties  in  accordance  with  the  procedures  set  forth  in  Section  2.8  that
describes in reasonable detail any amendment or modification to any Statement of Work.

1.13 “Company Background Patent Rights” means any Patent Rights Controlled by the Company as of the Effective Date that contain one or
more claims that cover Company Background Technology.

1.14 “Company Background Technology” means any Technology that is Controlled by the Company as of the Effective Date and used by the
Company in the conduct of the Project. For purposes of clarity, Company Background Technology shall not include any Company Inventions.

1.15  “Company  Confidential  Information”  means  any  Confidential  Information  that  is  a  tangible  embodiment  of  Company  Background
Technology and provided by the Company to X4 for use in the conduct of the Project.

1.16 “Company Facility” means the facility controlled and operated by the Company located at 111 Innovation Drive, Milton Park, Abingdon,
Oxfordshire, X14 4RZ, UK.

1.17 “Company Invention” means any Invention that (a) is conceived or reduced to practice solely by the Company during the Term without the
use  of  any  X4  Materials  and/or  X4  Background  Technology,  (b)  does  not  relate  in  any  respect  to  the  composition,  synthesis,  formulation,
mechanism  of  action  or  use  of  any  X4  Materials  (including  any  Compounds)  and/or  X4  Background  Technology,  and  (c)  relates  solely  and
specifically to Company Background Technology.

1.18 “Company Invention Patent Rights” means any Patent Rights that contain one or more claims that cover any Company Invention.

1.19 “Company Materials” means any Proprietary Materials that are Controlled by the Company and used by the Company, or provided by the
Company for use, in the conduct of any Project.

1.20 “Compound” means any of the proprietary compounds of X4 described more fully in any Statement of Work.

1.21 “Confidential Information” means, with respect to a Party (a “Disclosing Party”), all information and Technology of the Disclosing Party
that is of a private, secret or confidential nature, in whatever form, that relates to the business, financial condition, technology, products or services
of the Disclosing Party, its Affiliates, customers, suppliers, or potential customers or suppliers, disclosed or provided by such Disclosing Party to
the other Party (the “Receiving Party”) pursuant to or in connection with this Agreement, whether communicated in writing, electronically or
orally, or by any other method. Notwithstanding the foregoing, none of the foregoing shall be considered to be Confidential Information if (a) as of
the date of disclosure, it is known to the Receiving Party, as demonstrated by written documentation maintained in the ordinary course of business;
(b) as of the date of disclosure it is in the

public domain or it subsequently enters the public domain through no fault of the Receiving Party; (c) it is obtained by the Receiving Party from a
Third  Party  having  a  lawful  right  to  make  such  disclosure  free  from  any  obligation  of  confidentiality  to  the  Disclosing  Party;  or  (d)  it  is
independently  developed  by  or  for  the  Receiving  Party  without  reference  to  or  use  of  any  Confidential  Information  of  the  Disclosing  Party  as
demonstrated by written documentation maintained in the ordinary course of business. For purposes of clarity, all X4 Background Technology, all
other information provided by X4 to the Company with respect to the X4 Materials and all Results shall be Confidential Information of X4 for
purposes of this Agreement.

1.22 “Control” or “Controlled” means (a) with respect to Technology or Patent Rights, the ability of a Party to use, grant access to, or grant a
license or sublicense to, such Technology or Patent Rights (other than pursuant to this Agreement) as provided herein without violating the terms
of any agreement or arrangement with any Third Party and without violating any Applicable Laws and (b) with respect to Proprietary Materials,
the possession by a Party of the right to supply such Proprietary Materials to the other Party as provided herein without violating the terms of any
agreement or arrangement with any Third Party and without violating any Applicable Laws.

1.23 “Equipment” means any items of equipment described in any Statement of Work that are purchased by the Company on behalf of X4 and
used to provide Services.

1.24 “Executive Officers” means the Chief Executive Officer of X4 and the Chief Executive Officer of the Company.

1.25 “FDA” means the United States Food and Drug Administration or any successor agency or authority thereto.

1.26 “FDCA” means the United States Federal food, Drug and Cosmetic Act, as amended.

1.27  “Force  Majeure”  means  any  occurrence  beyond  the  reasonable  control  of  a  Party  that  (a)  prevents  or  substantially  interferes  with  the
performance  by  that  Party  of  any  of  its  obligations  under  this  Agreement  and  (b)  occurs  by  reason  of  any  act  of  God,  flood,  fire,  explosion,
earthquake, strike, lockout, labor dispute, casualty or accident, or war, revolution, civil commotion, act of terrorism, blockage or embargo, or any
injunction,  law,  order,  proclamation,  regulation,  ordinance,  demand  or  requirement  of  any  government  or  of  any  subdivision,  authority  or
representative of any such government.

1.28  “Invention” means any Technology (including, without limitation, any new and useful process, method of manufacture or composition of
matter) that is conceived or first reduced to practice by the Company, any Affiliate of the Company and/or any Approved Subcontractor in the
conduct of the Services.

1.29 “Patent Rights” means all rights and interests in and to issued patents and pending patent applications including, without limitation, non-
provisional  patent  applications,  and  all  divisions,  continuations  and  continuations-in-part  thereof,  patents  issuing  on  any  of  the  foregoing,  all
reissues,  reexaminations,  renewals  and  extensions  thereof,  and  supplementary  protection  certificates  therefor,  as  well  as  any  certificates  of
invention or applications therefor, and all foreign equivalents of any of the foregoing.

1.30 “Person” means an individual, sole proprietorship, partnership, limited partnership, limited liability partnership, corporation, limited liability
company,  business  trust,  joint  stock  company,  trust,  incorporated  association,  joint  venture  or  similar  entity  or  organization,  including  a
government or political subdivision, department or agency of a government.

1.31 “Project” means the full range of process development and manufacturing services to be provided by the Company under this Agreement as
more fully described in the Project Plan.

1.32 “Project Completion Date” means the date on which all Deliverables contemplated by the Project Plan have been delivered.

1.33  “Project  Plan”  means  the  plan  describing  the  overall  scope,  timelines  and  Deliverables  applicable  to  the  Services,  a  copy  of  which  is
attached hereto as Exhibit A and incorporated herein by reference.

1.34 “Proprietary Materials” means any tangible chemical, biological or physical materials that are (a) furnished by or on behalf of one Party to
any other Party in connection with this Agreement, whether or not specifically designated as proprietary by the transferring Party, or (b) conceived
or reduced to practice in the conduct of the Services.

1.35 “Regulatory Authority” means any regulatory authority, including the FDA, within the Territory with authority over the development of the
manufacturing process contemplated by this Agreement.

1.36 “Results” means all data and results produced or developed by the Company in the conduct of the Services, including all Reports.

1.37 “Service Fees” means the aggregate fees to be paid by X4 to the Company in consideration of the conduct of the Services. For purposes of
clarity, the estimated Service Fees for each Project and the payment schedule applicable thereto shall be set forth in each Statement of Work and
may be revised only to the extent agreed to by the Parties in a Change Order.

1.38 “Storage Guidelines” means  X4’s  procedures  that  describe  the  methods  of  storing,  preserving  and  monitoring  any  and  all  X4  Materials,
which shall be set forth in each Statement of Work.

1.39 “Technology” means, collectively, inventions, discoveries, improvements, know-how, trade secrets and proprietary methods, whether or not
patentable, including, without limitation: (a) methods of production or use of, and structural and functional information pertaining to, chemical
compounds and (b) compositions of matter, data, formulations, processes, techniques and results.

1.40 “Term” means the period beginning on the Effective Date and continuing for a period of five (5) years, subject to early termination pursuant
to Section 6.2; provided that if this Agreement is terminated prior to the end of the Term, the effective date of such early termination shall become
the last day of the Term.

1.41 “Territory” means the United Kingdom, and any additional countries or territories, as applicable or required under a subsequent Statement
of Work.

1.42 “Third Party” means a Person other than the Company and X4 and their respective Affiliates.

1.43 “X4 Background Patent Rights” means any Patent Rights Controlled by X4 that contain one or more claims that cover X4 Background
Technology.

1.44 “X4 Background Technology” means  any  Technology  that  (a)  is  Controlled  by  X4  as  of  the  Effective  Date  and/or  during  the  Term,  (b)
relates  to  the  X4  Materials  and  (c)  is  necessary  or  useful  for  the  Company  to  perform  the  Project.  For  purposes  of  clarity,  X4  Background
Technology (a) shall not include any X4 Inventions and (b) shall include, without limitation, the Technology described in any Statement of Work.

1.45 “X4 Confidential Information” means any Confidential Information that is a tangible embodiment of X4 Background Technology and is
provided by X4 to the Company for use in the conduct of the Services.

1.46 “X4 Invention” means any Invention that is not a Company Invention. For purposes of clarity, the term X4 Invention shall include, without
limitation, any Invention that (a) covers or relates to the composition, synthesis, formulation, mechanism of action and/or use of the X4 Materials
(including any Compound) and/or (b) is a process or method of manufacture of the X4 Materials (including any Compound).

1.47 “X4 Materials” means any Proprietary Materials that are Controlled by X4 and provided by X4 for use in the conduct of the Project. For
purposes of clarity, X4 Materials shall include the Compound and any other Proprietary Materials described in any Statement of Work.

Additional Definitions. In addition, each of the following definitions shall have the respective meanings set forth in the section of this

Agreement indicated below:

Definition

AAA

Agreement

Claims

Company

Company Indemnitees

Company Personnel
Deliverables
Disclosing Party
Dispute
Effective Date
Indemnified Party
Indemnifying Party
JSC
Losses
Party/Parties
Project Manager
Quality Technical Agreement
Receiving Party
Registrations
Report
Services
Statement of Work
X4
X4 Indemnitees

Section

7.1.1(b)(i)

Recitals

5.4

Recitals

5.5

1.21

5.6
5.6
2.5
5.4

2.5
2.1
1.21

2.1

5.4

5.2.4
2.3.1

7.1.1(a)
Recitals

Recitals

2.3.3
2.3.2(b)

2.2.2
Recitals

2. CONDUCT OF SERVICES

2.1 Engagement of the Company. Subject to the terms and conditions set forth in this Agreement, X4 hereby engages the Company to provide
the process development and large scale synthesis services during the Term (the “Services”) identified and described in each Statement of Work
(as defined below) and in accordance with the quality agreement between the Parties dated Dec. 12, 2014 (the “Quality Technical Agreement”)
in support of the Project to be conducted with respect to the X4 Materials.

2.2 Project Plan; Statement of Work.

2.2.1 Project Plan. The Project Plan describing the overall scope of the Services to be provided by the Company during the Term of this
Agreement is attached hereto as Exhibit A.

2.2.2 Statement of Work. Prior to the Company commencing any Services with respect to the Project hereunder, X4 and the Company
shall prepare, and the Parties shall execute, a Statement of Work substantially in the form attached hereto as Exhibit B which will specify
the specific details of the Services and include, at a minimum, (a) the X4 Materials and X4 Background Technology to be provided by
X4,  (b)  the  specific  Services  to  be  performed  by  the  Company,  and  (c)  the  estimated  timelines,  estimated  Service  Fees  (including  a
detailed budget), and the additional terms and conditions, if any, applicable thereto (each, a “Statement of Work”). The initial Statement
of Work is attached hereto as Exhibit B-1 and, to the extent executed by the Parties, each subsequent Statement of Work shall be attached
hereto as consecutively numbered addendums to Exhibit B (e.g., Exhibit B-2, B-3, etc.), shall be incorporated herein by reference and
shall thereafter be subject to the terms and conditions of this Agreement as a Statement of Work hereunder.

2.3 Obligations of the Company.

2.3.1 Performance of Services. During the Term, the Company agrees to: (a) provide the Services identified in each Statement of Work
(i) in accordance with (A) the Quality Technical Agreement and (B) all Applicable Laws, including cGCP, and cGMP, and the highest
prevailing  professional  standards  and  practices  applicable  in  the  industry  using  the  same  degree  of  professionalism  and  standards  as
customarily  provided  by  similar  entities  providing  such  services,  (ii)  at  such  times  and  at  such  locations  as  may  be  specified  in  the
relevant  Statement  of  Work,  and  (iii)  within  the  timelines  specified  in  the  relevant  Statement  of  Work  and  (b)  make  all  commercially
reasonable efforts to deliver to X4 the deliverables specified in the relevant Statement of Work (the “Deliverables”) in the quantities, and
meeting  the  specifications,  set  forth  therein.  The  Company  will  not  be  liable  to  X4  under  this  Section  2.3.1,  nor  be  deemed  to  have
breached this Section 2.3.1, for the Company’s failure to comply with this Section 2.3.1 in a timely manner to the extent any such failure
is attributable to (i) X4’s failure to provide any documents, X4 Materials or information set forth in the Statement or Work or (ii) X4’s
failure  to  otherwise  reasonably  cooperate  with  the  Company  in  connection  with  the  Company’s  conduct  of  the  Services  under  this
Agreement. For purposes of clarity, any such failure by X4 will automatically extend any timelines set forth in the applicable Statement
of Work by a time period that reasonably takes into account such failure of X4 to provide documents, X4 Materials, information or such
reasonable cooperation.

2.3.2 Records; Reports.

(a) Records. The Company shall maintain records of its activities under the Project in sufficient detail, in good scientific manner
and otherwise in a manner that reflects all work done and results achieved in the performance of the Project. Without limiting
the generality of this Section 2.3.2(a), the Company agrees to maintain a policy that requires its employees and consultants to
record and maintain all data and information developed during the Project in a manner that will allow the Parties to use such
records to establish the earliest date of conception or reduction to practice of any and all Inventions.

(b) Reports.  The  Company  shall  keep  the  JSC  (as  defined  below)  regularly  informed  of  the  progress  of  the  Project.  Without
limiting the generality of the foregoing, the Company shall promptly, not less than once each Calendar Quarter during the Term
(and more frequently if  required  to  keep  the  JSC  sufficiently  informed),  provide  the  JSC  with  (i)  reports  in  reasonable  detail
regarding the status of the Company’s conduct of the Services, (ii) all not previously reported Results, Inventions, original works
of authorship, trade secrets, or other Technology generated, conceived, developed and/or reduced to practice in the performance
of  the  Services  and  (iii)  such  supporting  data  and  information  as  may  be  reasonably  requested  from  time  to  time  by  the  JSC
regarding the Project (each such report, a “Report”).

2.3.3 Responsibility for Registrations. The Company shall secure and maintain in good order, at its sole cost and expense, all current
governmental registrations, permits and licenses, that are required by any Regulatory Authority in the Territory (the “Registrations”), for
so long and to the extent necessary to permit the Company to perform any of its obligations under this Agreement. The Company shall
make copies of such Registrations available for viewing by X4 and its designees for inspection, upon reasonable request from X4.

2.3.4 Additional Safety Responsibilities of the Company. The Company shall be solely responsible for: (a) assuring that its employees
engaged  in  the  conduct  of  the  Services  are  appropriately  trained  in  the  handling  and  use  of  the  X4  Materials;  (b)  implementing
appropriate  safeguards  applicable  to  the  conduct  of  the  Services  as  is  reasonably  necessary  to  protect  the  safety  of  its  employees;  (c)
handling, storing, transporting and disposing of all waste material generated through the conduct of the Services in compliance with all
Applicable Laws.

2.3.5 Second Manufacturing Source. At any time during the Term, X4 may submit a written notice to the Company that it wishes to
designate a Third Party identified by X4 as a second manufacturing source for any Compound, which notice shall include the Third Party
it wishes to

so designate (the “Third Party Manufacturer”). Promptly following the Company’s receipt of any such request, the Parties shall agree
in  good  faith  upon  the  terms  of  any  technology  transfer  from  the  Company  to  the  Third  Party  Manufacturer  that  may  be  reasonably
necessary in order for the Third Party Manufacturer to undertake such manufacture, including the transfer by the Company to the Third
Party Manufacturer of all necessary tangible materials and any other Technology and documentation Controlled by the Company that is
reasonably  necessary  to  manufacture  such  Compound  (each,  a  “Technology Transfer”).  X4  shall  reimburse  the  Company  for  (i)  the
Company’s reasonable internal (FTE-based) costs and out of pocket expenses incurred in undertaking any such Technology Transfer and
(ii) any facility scale-up, validation and regulatory authorization costs and expenses incurred to establish the Third Party Manufacturer as
such second Manufacturing source.

2.3.6 Assistance  with  Regulatory  Filings.  Upon  the  written  request  of  X4,  the  Company  shall  provide  X4  and/or  X4’s  Third  Party
consultants with reasonable assistance and consultation, and at reasonable costs to be agreed by the Parties to be reimbursed by X4, in
connection  with  the  preparation  and  submission  of  any  filings  to  be  made  by  X4  with  any  Regulatory  Authority  with  respect  to  any
Compound, including reasonable assistance with the preparation of the Chemistry Manufacturing and Controls (CMC) sections of any
Common Technical Document (CTD) prepared with respect to any Compound and any technical reports and/or validation reports that
may be required to support such filings.

2.4 Obligations of X4. During the Term, X4 shall provide to the Company, at X4’s sole cost and expense, such Confidential Information of X4
(including without limitation such specifications, data and protocols applicable to X4 Materials) and such quantities of X4 Materials as may be
reasonably necessary or useful for the Company in the performance of the Project as indicated in the applicable Statement of Work. X4 covenants
that it will not request or require the Company to perform any assignments or tasks in a manner that would violate any Applicable Laws or to
handle any X4 Materials that are hazardous unless X4 provides the Company with any information in X4’s possession or control concerning any
health hazards associated with exposure to or the handling, storage, use or disposal of such X4 Material. X4 shall be solely responsible for its
decision  to  use  or  report  (or  not  use  or  report)  data  or  information  provided  by  the  Company  in  connection  with  the  conduct  of  the  Services.
Except as set forth in Section 2.3.3, X4 will cooperate with the Company, at its sole cost and expense, in taking any actions that are reasonably
necessary  to  comply  with  any  regulatory  obligations  applicable  to  the  conduct  of  the  Services  as  described  in  any  Statement  of  Work  in
accordance with this Agreement.

2.5  Project  Management.  The  day-to-day  interactions  and  management  with  respect  to  the  Project  will  be  performed  by  two  (2)  project
managers,  with  one  (1)  appointed  by  each  Party  (each,  a  “Project  Manager”).  The  Project  Managers  shall  be  the  principle  point  of  contact
between the Parties. As part of their duties, the Project Managers shall (a) be responsible for monitoring and revising the Statement of Work in
accordance  with  the  procedures  set  forth  in  Section  2.8,  establishing  operating  guidelines  for  the  Project,  defining  communication  formats,
forming and approving teams and monitoring the general progress of each Project and (b) co-chair Joint Steering Committee (the “JSC”). The
Project Managers shall be appointed by each Party no later than thirty (30) days following the Effective Date and may thereafter be removed and a
new Project Manager appointed by each respective Party, at such Party’s sole discretion, upon written notice to the other Party.

2.6 Joint Steering Committee.

2.6.1  Establishment. Within thirty (30) days of the Effective Date, the Parties shall establish the JSC, consisting of an equal number of
(not more than two (2)) representatives from each Party, including, without limitation, each Party’s Project Manager and one (1) technical
or  other  representative  from  each  Party.  The  JSC  will  meet  to  discuss  any  matters  that  cannot  be  resolved  by  the  Parties’  respective
Project Managers and to monitor the general progress of the Project.

2.6.2 Frequency of JSC Meetings; Agendas. Meetings  of  the  JSC  shall  be  conducted  on  a  schedule  to  be  determined  by  the  Project
Managers and may be held by telephone or in person. The frequency and the location for such meetings shall be established by the JSC.
Meetings may

be  held  only  if  a  quorum  of  at  least  one  (1)  representative  of  each  Party  participates.  The  Project  Manager  for  each  Party  shall  be
responsible for setting the agenda in advance of each JSC meeting date. Any member of the JSC may propose additional agenda items in
advance  of  each  meeting.  X4  will  prepare  minutes  of  each  JSC  meeting  promptly  following  each  meeting  and  will  distribute  such
minutes to the Company for review and approval.

2.6.3 Dispute Resolution. The objective of the JSC shall be to reach agreement by consensus on all matters, and the JSC will diligently
and in good faith seek to resolve any matters in dispute. If the JSC is unable to resolve a dispute despite its good faith efforts, either Party
may  refer  the  dispute  to  the  Executive  Officer  (or  other  designee)  of  each  Party  in  accordance  with  Section  7.1.1(a).  If  the  Executive
Officer(s)  (or  other  designees)  are  unable  to  resolve  the  disputed  matter  as  provided  in  Section  7.1.1(a),  either  Party  may,  by  written
notice to the other Party, refer the dispute to binding arbitration in accordance with Section 7.1.1(b).

2.7 License Grants.

(a) License to the Company. X4 hereby grants to the Company a fully paid, non- exclusive license under any and all X4 Background Technology and X4
Background  Patent  Rights  to  the  extent  necessary  for  the  Company  to  conduct  the  Services  during  the  Term,  including  for  the  Company  to  use  the  X4
Materials to the extent necessary to conduct the Services.

(b) License to X4. If any Company Invention is employed by, is embodied within, or otherwise materially useful or necessary to use or to practice, any
Deliverable or X4 Invention, the Company shall be deemed to have granted, and hereby grants, to X4 a non-exclusive, worldwide, royalty- free, fully-paid,
sublicensable, perpetual license under such Company Invention solely to the extent necessary to practice such Deliverable and/or X4 Invention.

2.8 Change Orders.

2.8.1  Company-Initiated  Changes.  If  at  any  time  during  the  Term,  the  Company  reasonably  determines  that  it  is  necessary  in  the
conduct of the Project to perform Additional Services not specifically provided for in the applicable Statement of Work, the Company
shall prepare a Change Order describing in reasonable detail the nature of such Additional Services, and submit such Change Order to X4
for X4’s review and written approval. All Change Orders approved by X4 shall be signed by the Project Manager of each Party or by
such  other  authorized  representatives  of  the  Company  and  X4  that  the  Project  Managers  may  designate  in  writing.  If  any  changes
contemplated by a Change Order will, or are reasonably expected to, impact the estimated timing, Service Fees or scope of the Project
and/or  any  Statement  of  Work,  the  Company  shall  provide  X4  with  a  written  description  of  such  expected  impact  (including,  if
applicable, a written estimate of all such increased Service Fees) in the Change Order.

2.8.2 X4-Initiated Changes. X4 shall have the right to request reasonable modifications to any Statement of Work by providing a written
notice thereof to the Company. Upon receipt of such notice, the Company shall generate a Change Order and submit such Change Order
to X4 for X4’s review and approval in accordance with the process described in Section 2.8.1.

2.8.3  Effect  of  Change  Orders.  Upon  approval  of  each  Change  Order  as  described  in  this  Section  2.8,  (a)  the  Change  Order  shall
constitute an amendment to the applicable Statement of Work, (b) the Additional Services described in the Change Order shall be deemed
to  be  Services  for  purposes  of  this  Agreement,  and  (c)  the  Change  Order  will  be  implemented  by  the  Company  as  soon  as  it  is
commercially practical to do so in accordance with the timeline, if any, set forth in the Change Order.

2.9 Use of X4 Materials. The Company shall maintain all X4 Materials in safe, secure and segregated storage under its control in the Company
Facility in accordance with the Storage Guidelines. The Company hereby agrees that, notwithstanding anything to the contrary in this Agreement
or in the Statement of Work, (a) the Company shall not use X4 Materials for any purpose other than in the conduct of the Services at the Facility;
(b) the Company shall transfer X4 Materials only to those employees or consultants of the

Company who are conducting the Services at the Facility and who are bound by obligations of confidentiality and non-use comparable in scope to
those set forth in this Agreement; (c) the Company shall not (i) transfer, distribute or release any X4 Materials to any Third Party without the prior
written  consent  of  X4  or  (ii)  analyze  in  any  way  the  composition  of  the  X4  Materials  or  otherwise  perform  any  studies  that  might  reveal  the
structures or compositions of the X4 Materials; (d) the Company shall not acquire any right, title or interest in or to the X4 Materials as a result of
such supply by X4 or the use by the Company of the X4 Materials in the conduct of the Services; and (e) upon the expiration or termination of the
Term, the Company shall, if and as instructed by X4, either destroy or return to X4 all unused quantities of X4 Materials.

2.10 No Right to Subcontract. The Company shall not subcontract, sublicense or otherwise delegate all or any portion of the Services under this
Agreement  to  any  Third  Party  without  X4’s  prior  written  consent.  Notwithstanding  the  foregoing,  the  Company  may  subcontract  certain  non-
essential or routine tasks that are part of the Services without X4’s consent to any Approved Subcontractor; provided that they involve tasks which
would normally be sub contracted by the Company in the normal course of its business.
2.11  Facility  Visits  by  X4  Personnel.  X4’s  representatives  (unless  such  representatives  are  employed  by,  or  engaged  as  consultants  of,
competitors of the Company) may, upon reasonable prior written notice, visit the Company Facility during those hours during which Services are
performed on dates and at times that are not materially disruptive to the business of the Company to observe the progress of the Services and in
order  to  ascertain  compliance  by  the  Company  with  the  terms  of  this  Agreement,  which  visit  shall  include,  as  requested  by  the  Company,  the
inspection of (a) the holding facilities for X4 Materials, (b) the Equipment, (c) the quality control procedures and systems of the Company, and (d)
all  Records  relating  to  the  Services.  An  audit  may  be  held  once  per  calendar  year  at  no  cost.  X4  will  reimburse  the  Company  for  its  time  and
expenses associated with any additional audit during such calendar year unless such audit is as a result of a Company breach of, or reveals that the
Company has breached, this Agreement or any applicable law or regulation. Any information disclosed to X4 representatives in writing, orally or
by inspection of tangible objects in connection with any such visit shall be considered the Company Confidential Information and protected as
such by X4 pursuant to the terms of this Agreement.

2.12 Product Release. The Company shall be responsible for release of any Compound to X4. Final disposition of any Compound shall be the
responsibility of X4. Except for samples, X4 shall provide written authorization to the Company prior to shipment of any Compound. Final release
of any Compound for distribution in EU is the sole responsibility of the Qualified Person at X4 designated testing/release site. The Company shall
forward to X4 applicable documents which comprise the disposition package for each batch of each Compound. The Company shall promptly
notify X4 in writing about any regulatory investigations concerning the Manufacturing of any Compound.

2.13 Batch Rejection of Manufactured Compound. During the period commencing on X4’s receipt of each delivered batch of manufactured
Compound (each a “Batch”) and continuing until the later of (i) thirty (30) days following the date of X4’s receipt of such Batch, or (ii) fifteen
(15) days following X4’s receipt of the applicable released executed Batch record(s) and related documentation in accordance with the Statement
of Work Order (such period, the “Testing Period”), X4 shall have the right (but not the obligation) to test and inspect such Batch to determine
whether such Batch conforms to GMP, the specifications, the Statement of Work and, if applicable, the Quality Technical Agreement (collectively
the “Product Requirements”). X4 shall notify the Company prior to the expiration of the Testing Period in writing of its rejection of any Batch
describing the manner in which such Batch does not conform to the Product Requirements, together with reasonable supporting evidence, if any,
and the Company shall consider in good faith whether it agrees with X4’s rejection of such Batch and shall deliver notice to X4 of the Company’s
conclusion within ten (10) days after Company’s receipt of the written rejection notice from X4. If X4 fails to deliver to the Company, prior to the
expiration of the Testing Period, a written rejection notice, then X4 shall be deemed to have accepted such Batch. If Company delivers a written
notice to X4 within such ten (10) day period that the Company disagrees with X4’s rejection of such Batch, then the Parties shall submit the
samples of such Batch to any independent testing laboratory or other appropriate expert, in each case, mutually acceptable to the Parties, for
resolution, whose determination of conformity or non-conformity shall be binding upon the Parties. If the laboratory or expert subsequently
determines

that the Batch does conform with the Product Requirements, then (a) X4 shall be deemed to have accepted such Batch, and (b) X4 shall bear the
costs associated with retaining such laboratory or consultant. If the Company delivers a written notice to X4 that the Company agrees with X4’s
rejection of a Batch, or the laboratory or expert subsequently confirms that such Batch does not conform to the Product Requirements, (and, in the
case of a Batch that is manufactured pursuant to a non-validated process, such Batch non-conformance is proven to be due to negligence, material
deviation from the approved batch record, or gross violation of GMP where Aptuit and X4 agree batch rejection is required, willful misconduct or
omission by Company), the Company, shall, (a) at X4’s option promptly (i) supply X4 with a conforming Batch at the Company’s sole cost and
expense or (ii) credit X4 for such non-conforming Batch and (b) bear the costs associated with retaining such laboratory or consultant, to the
extent retained by the Parties as provided above.

2.14 Compensation.

2.14.1 Service Fees. In consideration of the performance of the Services, X4 will pay the Company the Service Fees applicable to the
conduct of the Services, as set forth in the applicable Statement of Work. X4 understands and agrees that each Statement of Work will
require an upfront payment upon its execution.

2.14.2  Payment  Terms.  Invoices  for  Service  Fees  shall  be  issued  by  the  Company  to  X4  within  thirty  (30)  days  after  the  end  of  the
month in which such Services are provided or Service Fees incurred, as the case may be. All invoices will be sent to X4 Pharmaceuticals
via email at accounts.payable@X4pharma.com. All amounts due thereunder shall be due and payable by X4 within thirty (30) days after
receipt of each such invoice. Notwithstanding the foregoing, X4 may withhold payment of any invoiced Service Fees that it disputes in
good  faith;  provided  that  (a)  within  twenty-one  (21)  days  after  receiving  any  invoice,  X4  shall  notify  the  Company  if  it  disputes  the
accuracy or appropriateness of such invoiced amount and shall specify the particular respects in which it believes such invoiced amount
is  inaccurate  or  inappropriate;  and  (b)  as  soon  as  practicable  thereafter,  the  Parties  shall  negotiate  in  good  faith  to  resolve  any  such
dispute in accordance with Section 7.1.1 of this Agreement. The currency of this Agreement and of all related Statements of Work is U.S.
Dollars. All payments under this Section 2.13.2 shall be made by X4 by wire transfer or check in U.S. currency to the account specified
in the Statement of Work. Past due amounts which are not in dispute shall bear interest from the date due until paid at a rate equal to the
lesser of twelve percent (12%) per annum, or the maximum rate permitted by Applicable Laws.

2.14.3 Non-Payment of Undisputed Amounts. If X4 fails to pay undisputed invoices when due, in addition to its other rights under this
Agreement, the Company will have the right, in its discretion, to cease all activities hereunder and withhold the Deliverables with respect
to  the  unpaid  amount  until  such  outstanding  and  undisputed  invoices  have  been  paid  in  full.  It  is  understood  that  prior  to  ceasing  all
activities and withholding the Deliverables, the Company will make all reasonable efforts to initiate good faith discussions with X4 with
a view to resolving the payment issues otherwise.

2.15 Regulatory Matters. The Company will notify X4 promptly, and in no event later than one (1) Business Day, after the Company receives
any contact or communication from any Regulatory Authority relating to any Services provided hereunder and will provide X4 with copies of any
such  communication  within  one  (1)  Business  Day  of  receipt  of  such  communication  by  the  Company.  The  Company  will  consult  with  X4
regarding the response to be made to any inquiry from any Regulatory Authority relating to any Services provided hereunder and will allow X4 at
its  discretion  to  control  and/or  participate  in  any  further  contacts  or  communications  relating  thereto.  The  Company  will  comply  with  all
reasonable requests and comments by X4 with respect to all contacts and communications with any Regulatory Authority relating in any way to
the Services. The Company will immediately inform X4 in the event that any Regulatory Authority takes regulatory action against the Company
for  reasons  unrelated  to  the  Services,  if  such  action  would  reasonably  be  expected  to  have  an  effect  on  the  Company’s  performance  of  the
Services.
2.16 Accident Reports. The Company shall promptly report to X4 all material accidents related to the manufacture, handling, use or storage of
any X4 Materials.

3. TREATMENT OF CONFIDENTIAL INFORMATION

3.1  Confidentiality  Obligations.  X4  and  the  Company  each  recognizes  that  each  other  Party’s  Confidential  Information  constitutes  highly
valuable assets of the other Party. X4 and the Company each agree that, subject to the remainder of this Article 3, during the Term and thereafter
following  the  termination  or  expiration  of  this  Agreement,  it  will  hold  in  confidence  and  will  not  disclose,  and  will  cause  its  Affiliates  to  not
disclose, any Confidential Information of the other Party and it will not use, and will cause its Affiliates to not use, any Confidential Information
or Proprietary Materials of the other Party except as expressly permitted hereunder.
3.2 Limited Disclosure and Use. Each Receiving Party agrees that disclosure of the Confidential Information of the Disclosing Party, or transfer
of any Proprietary Materials of the Disclosing Party, may only be made by the Receiving Party to any employee, consultant or Affiliate of the
Receiving Party, or, with respect to the Company as Receiving Party, to any Approved Subcontractor, to enable such Receiving Party to exercise
its rights or to carry out its responsibilities under this Agreement; provided that any such disclosure or transfer shall only be made to Persons who
are bound by written obligations of confidentiality no less restrictive than those described herein. In addition, each Party agrees that the Receiving
Party may disclose the Confidential Information of the Disclosing Party (a) on a need-to-know basis to such Receiving Party’s legal and financial
advisors  who  are  bound  by  written  obligation  of  confidentiality  no  less  restrictive  than  those  described  herein;  (b)  as  reasonably  necessary  in
connection with an actual or potential merger, acquisition, consolidation, share exchange or other similar transaction involving such Party and any
Third Party in accordance with Section 7.7 of this Agreement; and (c) as required by Applicable Laws or compelled to do so by order or decree;
provided that in the case of any disclosure under this clause (c), the Receiving Party shall (i) provide the Disclosing Party with reasonable advance
written notice of, and an opportunity to comment on, any such required disclosure and (ii) if requested by the Disclosing Party, cooperate in all
reasonable respects with the Disclosing Party’s efforts to obtain confidential treatment or a protective order with respect to any such disclosure, at
the Disclosing Party’s expense.

3.3 Employees and Consultants. X4 and the Company each hereby represents that all of its employees and consultants, and all of the employees
and  consultants  of  its  Affiliates,  who  have  access  to  Confidential  Information  or  Proprietary  Materials  of  each  other  Party  are  or  will,  prior  to
having such access, be bound by written obligations to maintain such Confidential Information or Proprietary Materials in confidence. Each Party
agrees to, and to cause its Affiliates to, enforce such obligations and to prohibit its employees and consultants from using such information except
as expressly permitted under this Agreement. Each Party will be responsible for, and liable to, the other Party for any disclosure or misuse by its
employees of Confidential Information or Proprietary Materials of the other Party.

3.4 Publicity. Except  as  required  by  Applicable  Laws,  no  Party  shall  issue  a  press  or  news  release  or  make  any  similar  public  announcement
related to the terms or existence of this Agreement or the conduct of the Services without the prior written consent of the other Party. In the event
that such disclosure is required as aforesaid, the disclosing Party shall provide the other Party with notice beforehand and coordinate with the other
Party  with  respect  to  the  wording  and  timing  of  any  such  disclosure.  Once  any  press  release  or  any  other  written  statement  is  approved  for
disclosure by both Parties, any Party may make subsequent public disclosure of the contents of such statement without the further approval of the
other Parties. Notwithstanding the foregoing, no Party shall use the name of the other Party in any promotional materials or advertising without the
prior express written consent of the other Party.

4.  INTELLECTUAL PROPERTY RIGHTS

4.1  X4 Intellectual Property Rights. X4 shall have sole and exclusive ownership of all right, title and interest on a worldwide basis in and to any
and  all  X4  Background  Technology,  X4  Background  Patent  Rights,  X4  Materials,  X4  Inventions,  Results  and  Deliverables.  In  connection
therewith, the Company hereby assigns, and shall require its employees to assign, to X4, all right, title and interest in and to all X4 Inventions,
Results and Deliverables.
4.2 Company Intellectual Property Rights. The Company shall have sole and exclusive ownership of all right, title and interest on a worldwide
basis  in  and  to  any  and  all  Company  Background  Technology,  Company  Patent  Rights  and  Company  Inventions.  In  connection  therewith,  X4
hereby assigns, and shall require its employees to assign, to the Company, all right, title and interest in and to all Company Inventions subject to
the license granted to X4 pursuant to Section 2.7(b).

4.3  Ownership  of  Equipment.  X4  shall  own  all  right,  title  and  interest  in  and  to  any  and  all  Equipment,  and  all  materials  and  other  assets
purchased  by  the  Company  for  the  performance  of  the  Services  to  the  extent  the  cost  of  same  is  reimbursed  by  X4.  All  Equipment  shall  be
maintained  by  the  Company  in  accordance  with  its  standard  maintenance  program.  X4  shall  be  liable  for  all  damage  and  risk  of  loss  to  the
Equipment, unless caused by the gross negligence or willful misconduct of the Company. X4 shall have the right to reclaim or retain possession of
such Equipment at its expense upon reasonable notice at such time as it is no longer required for use by the Company to conduct the Services.

4.4 Cooperation. During the Term of this Agreement, the Company shall cooperate fully with X4 and its attorneys and agents in the preparation
and filing of all papers and other documents as may be required to obtain, perfect, sustain and enforce X4’s rights in and to any X4 Inventions,
including but not limited to, joining in any proceeding to obtain letters, patents, copyrights, trademarks or other legal rights with respect to any
such  X4  Inventions  in  the  United  States  and  in  any  and  all  other  countries;  provided  that  X4  shall  bear  the  expense  of  such  proceedings.  Any
patent or other legal right with respect to any X4 Inventions issued to the Company personally shall be assigned by the Company to X4 without
charge by the Company. In the event X4 is unable for any reason, after reasonable effort, to secure the Company’s signature on any document
needed  in  connection  with  the  actions  specified  in  this  Section  4.4,  the  Company  hereby  irrevocably  designates  and  appoints  X4  and  its  duly
authorized officers and agents as its agent and attorney in fact, which appointment is coupled with an interest, to act for and on its behalf, for the
express and sole purpose to execute, verify and file any such documents to further the purposes of this Section 4.4 with the same legal force and
effect as if executed by the Company.

4.5 Record Retention.  The  Company  will  maintain  records  of  all  Results  obtained  or  generated  by  the  Company  in  the  course  of  providing
Services  hereunder,  including  all  computerized  records  and  files,  in  accordance  with  Applicable  Laws  and  industry  standards  in  a  secure  area.
Upon  the  written  request  of  X4,  copies  of  all  such  records  will  be  delivered  to  X4  or  to  its  designee  in  such  form  as  is  then  currently  in  the
possession  of  the  Company.  Company  shall  retain  originals  of  all  such  records  for  a  period  of  ten  (10)  years,  or  as  otherwise  required  by
Applicable Laws, whichever is longer. In no event will the Company dispose of any such records without first giving X4 sixty (60) days’ prior
written notice of its intent to do so; provided that the Company may retain copies of any records as are reasonably necessary for regulatory or
insurance  purposes,  subject  to  the  Company’s  obligations  of  confidentiality  under  this  Agreement.  X4  will  reimburse  the  Company  for  the
reasonable costs and expenses incurred by the Company for the copying and shipping of such records to X4.

5. REPRESENTATIONS AND WARRANTIES; INDEMNIFICATION

5.1 Mutual Representations and Warranties. Each Party hereby represents and warrants to the other Party, as of the Effective Date, as follows:

5.11 Organization.  It  is  a  corporation  duly  organized,  validly  existing  and  in  good  standing  under  the  laws  of  the  jurisdiction  of  its

organization, and has all requisite power and authority, corporate or otherwise, to execute, deliver and perform this Agreement.

5.1.2 Authorization.  The  execution  and  delivery  by  it  of  this  Agreement  and  the  performance  by  it  of  the  transactions  contemplated
hereby have been duly authorized by all necessary corporate action and will not violate (a) such Party’s certificate of incorporation or
bylaws, (b) any agreement, instrument or contractual obligation to which such Party is bound in any material respect, (c) any requirement
of any Applicable Laws, or (d) any order, writ, judgment, injunction, decree, determination or award of any court or governmental agency
presently in effect applicable to such Party.

5.1.3 Binding Agreement.  This  Agreement  is  a  legal,  valid  and  binding  obligation  of  such  Party  enforceable  against  it  in  accordance
with its terms and conditions.

5.1.4    No  Inconsistent  Obligation.  It  is  not  under  any  obligation,  contractual  or  otherwise,  to  any  Person  that  conflicts  with  or  is
inconsistent in any respect with the terms of this Agreement or that would impede the diligent and complete fulfillment of its obligations
hereunder.

5.2 Additional Representations of the Company. The Company further represents and warrants to X4, as of the Effective Date, as follows:

5.2.1 Company Facility. The Company owns or lawfully controls the Company Facility, and the Company Facility shall be maintained
in accordance with cGMP and cGCP and in such condition as will allow the Company to provide the Services in accordance with this
Agreement.

5.2.2 Adherence to Regulations. The Company has obtained and will at all times during the Term of this Agreement, maintain, hold and
comply with all Registrations necessary to perform this Agreement as now or hereafter required under any Applicable Laws.

5.2.3 Non-Debarment. The Company is not debarred under, and has not and will not, to the Company’s knowledge after diligent inquiry,
use, in performing the Services under this Agreement in any capacity, the services of any person debarred under, subsections 306(a) or (b)
of the Generic Drug Enforcement Act of 1992.

5.2.4 Qualifications of the Company Personnel.  The  Company  has,  and  will  engage,  employees  and/or  consultants  (the  “Company
Personnel”) with the proper skill, training and experience to provide the Services. Before providing Services, all the Company Personnel
will have agreed in writing to (a) confidentiality obligations consistent with the terms of this Agreement, and (b) effectively vest in the
Company any and all rights that such Company Personnel might otherwise have in the results of their work. All Company Personnel to
be used by the Company shall be listed in the applicable Statement of Work.

5.2.5 Use of Deliverables/X4 Inventions. To the Company’s knowledge, the performance of the Services under this Agreement does not
infringe or will not infringe upon the patents, copyrights or trademarks, or misappropriate the trade secrets, of any Third Party.

5.2.6  Use  of  Proprietary  Materials  by  the  Company.  Excluding  the  X4  Materials  and  any  other  materials  supplied  by  X4  to  the
Company, all Proprietary Materials procured by the Company for use in the conduct of the Services have been and will be procured in
compliance with all Applicable Laws.

5.2.7 Company Materials. The Company will use commercially reasonable efforts at all times during the term of this Agreement to keep
all Company Materials secure and safe from loss and damage in such manner as the Company stores materials of a similar nature. During
the Term, the Company will at all times segregate and store the Company Materials in such a way as to be able to distinguish the same
from products and materials belonging to the Company or held by the Company for a Third Party.

5.2.8  Warranty  Disclaimer.  THE  COMPANY  ACKNOWLEDGES  THAT  THE  X4  MATERIALS  ARE  SOLELY  FOR  USE  IN
HUMAN CLINICAL STUDY, THAT THE COMPANY IS AWARE OF THE RISKS OF WORKING WITH CLINICAL MATERIAL
AND  THAT  IT  WILL  UTILIZE  PRUDENT  PRACTICES  IN  HANDLING  THE  X4  MATERIALS.  EACH  PARTY  HEREBY
ACKNOWLEDGES THAT THE OTHER PARTY HEREBY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, RELATING
TO THE SERVICES INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.

5.3  Limited  Liability. (I)  NOTWITHSTANDING  ANY  OTHER  PROVISION  IN  THIS  AGREEMENT  OR  ANY  STATEMENT  OF  WORK
OTHER  THAN  SECTION  5.3(II)  BELOW  AND  EXCEPT  WITH  RESPECT  TO  ANY  BREACH  OF  ARTICLE  3,  AND  EXCEPT  AS
PROVIDED  IN  SECTION  5.4  OR  SECTION  5.5,  EITHER  PARTY’S  LIABILITY,  DAMAGE,  LOSS  OR  EXPENSE  UNDER  THIS
AGREEMENT AND ANY STATEMENT OF WORK TO THE OTHER PARTY SHALL BE LIMITED TO TWO TIMES THE AGGREGATE
SERVICE FEES PAID FOR THE SERVICES PERFORMED UNDER THE RELEVANT STATEMENT OF WORK. EXCEPT WITH RESPECT
TO ANY BREACH OF ARTICLE 3 OR IN CASE OF LOSSES ARISING OUT OF A FINALLY

ADJUDICATED THIRD PARTY CLAIM OR SETTLEMENT OF SUCH THIRD PARTY CLAIM PURSUANT TO SECTION 5.6 THAT IS, IN
EITHER  CASE,  SUBJECT  TO  SECTION  5.4  OR  5.5,  UNDER  NO  CIRCUMSTANCES  SHALL  EITHER  PARTY  BE  LIABLE  TO  THE
OTHER  PARTY  OR  ANY  OF  ITS  AFFILIATES  FOR  ANY  SPECIAL,  PUNITIVE,  INDIRECT,  INCIDENTAL  OR  CONSEQUENTIAL
DAMAGES,  INCLUDING,  WITHOUT  LIMITATION,  LOST  PROFITS  OR  LOST  REVENUES,  COST  OF  PROCUREMENT  OF
SUBSTITUTE  GOODS,  TECHNOLOGY  OR  SERVICES,  WHETHER  UNDER  ANY  CONTRACT,  WARRANTY,  NEGLIGENCE,  STRICT
LIABILITY  OR  OTHER  LEGAL  OR  EQUITABLE  THEORY.  (II)  NOTHING  CONTAINED  HEREIN  IS  INTENDED  TO  EXCLUDE  OR
LIMIT ANY LIABILITY FOR (a) DEATH OR PERSONAL INJURY CAUSED BY A PARTY’S NEGLIGENCE; OR, (b) FRAUD.

5.4  Indemnification  of  X4  by  the  Company.  The  Company  shall  indemnify,  defend  and  hold  harmless  X4,  its  Affiliates,  their  respective
directors, officers, employees and agents, and their respective successors and assigns (the “X4 Indemnitees”), against any liability, damage, loss
or  expense  (including  reasonable  attorneys’  fees  and  expenses  of  litigation)  (collectively,  “Losses”)  actually  incurred  by  or  imposed  upon  X4
Indemnitees or any one of them, as a direct result of any claims, suits, actions or demands made by any Third Party (collectively, the “Claims”) to
the  extent  arising  out  of  (a)  the  Company’s  and/or  its  Approved  Subcontractors’  and/or  its  employees’  or  agents’  gross  negligence  or  willful
misconduct in the performance of the Services; (b) the actual or alleged infringement of any patent rights, or intellectual property rights of any
Third Party as a result of the use by the Company of the Company Background Technology and/or Company Patent Rights in the conduct of the
Services; or (c) the Company’s and/or its Approved Subcontractors’ and/or its employees’ or agents’ breach of any material term or condition of
this Agreement; provided that the Company shall not be obligated to indemnify X4 for any Claims to the extent arising from or occurring as a
result of the gross negligence or willful misconduct of X4, its Affiliates or their respective employees or agents.

5.5 Indemnification of the Company by X4. X4 shall indemnify, defend and hold harmless the Company, its Affiliates, their respective directors,
officers, employees and agents, and their respective successors and assigns (the “Company Indemnitees”), against any Losses actually incurred
by or imposed upon the Company Indemnitees or any one of them, as a direct result of any Claims, to the extent arising out of (a) X4’s and/or its
employees’ or agents’ breach of any material term or condition of this Agreement; (b) the use or sale by X4 of the Results, the Deliverables and/or
any X4 Inventions; (c) the actual or alleged infringement by the Company of any patent rights or intellectual property rights of any Third Party as
a result of the use by the Company of X4 Background Technology or X4 Patent Rights in the conduct of the Services in accordance with any
Statement of Work; or (d) the gross negligence or willful misconduct of X4, its Affiliates or their respective employees or consultants; provided
that X4 shall not be obligated to indemnify the Company for any Claims to the extent arising from or occurring as a result of the gross negligence
or willful misconduct of the Company, its Affiliates or their respective employees or agents.

5.6 Conditions to Indemnification. An X4 Indemnitee or Company Indemnitee seeking recovery under Sections 5.4 or 5.5 (the “Indemnified
Party”) in respect of a Claim shall give prompt notice of such Claim to the Company or X4, as the case may be (the “Indemnifying Party”);
provided that the Indemnifying Party is not contesting its obligation under Sections 5.4 or 5.5, shall permit the Indemnifying Party to control any
litigation relating to such Claim and the disposition of such Claim (including without limitation any settlement thereof); provided further that the
Indemnifying Party shall not settle or otherwise resolve such Claim without the prior written consent of such Indemnified Party, which consent
shall not be unreasonably withheld, conditioned or delayed, unless such settlement includes a full release of the Indemnified Party, in which case
the Indemnifying Party may settle or otherwise resolve such Claim without the prior written consent of such Indemnified Party. Each Indemnified
Party shall cooperate with the Indemnifying Party in its defense of any such Claim in all reasonable respects and shall have the right to be present
in person or through counsel at all legal proceedings with respect to such Claim.

5.7 Insurance. During the Term, the Company shall carry, with financially sound and reputable insurers, insurance coverage (including errors and
omissions, professional liability and comprehensive liability coverage) with respect to the conduct of its business against loss from such risks and
in such amounts as is customary for well-insured companies engaged in similar businesses. In addition, X4 shall

maintain during the Term policies of insurance in the amounts and of the types reasonably appropriate for the conduct of its business.

6.1 Term. This Agreement shall commence on the Effective Date and continue, unless earlier terminated as provided herein, until the expiration of
the Term.

6.  TERM AND TERMINATION

6.2 Termination.

6.2.1 Unilateral Right to Terminate/Suspend Performance. X4 shall have the right to terminate this Agreement, or any Statement of
Work, or suspend the performance of any Statement of Work, for any reason, effective upon not less than thirty (30) days’ written notice
to the Company.
6.2.2 Termination for Breach. Either Party may terminate this Agreement, effective immediately upon written notice to the other Party,
for a material breach by the other Party of this Agreement that, if curable, remains uncured for twenty (20) days after the non-breaching
Party first gives written notice to the other Party of such breach and its intent to terminate this Agreement if such breach is not cured.
6.2.3  Termination  for  Insolvency.  Should  either  Party  become  insolvent  or  unable  to  pay  its  debts  as  they  fall  due  or  make  an
assignment for the benefit of creditors or should voluntary or involuntary bankruptcy or similar proceedings be instituted against it or if
any action, application or proceeding is made with regard to it for a voluntary arrangement, composition or reconstruction of its debts, or
the  presentation  of  an  administrative  petition,  or  its  winding-up  or  dissolution,  or  the  appointment  of  a  receiver,  liquidator,  trustee  or
similar officer of its property be appointed, then the other Party will have the right to terminate this Agreement forthwith by notice in
writing.

6.3 Consequences of Expiration of Termination of Agreement. In the event of the termination of this Agreement pursuant to Section 6.2, or the
expiration of the Term pursuant to Section 6.1, the following provisions shall apply:
(a) the license granted by X4 to the Company pursuant to Section 2.7(a) shall immediately terminate;

(b) the license granted by the Company to X4 pursuant to Section 2.7(b) shall continue in full force and effect;
(c)  Company will terminate all Services in progress in an orderly manner as soon as practical and in accordance with a schedule agreed to by X4;
(d)  the Company will deliver to X4 any X4 Materials in its possession or Control and all Deliverables developed through the date of termination
or expiration;
(e)  X4 will pay the Company (i) any Service Fees due and owing the Company, up to the effective date of termination or expiration, for Services
actually  performed  and  all  authorized  expenses  actually  incurred  (as  specified  in  the  applicable  Statement(s)  of  Work),  (ii)  any  non-cancelable
costs incurred before termination of this Agreement but paid after the effective termination date, and any termination payments specified in the
relevant  Statement  of  Work  and  (iii)  expenses  incurred  to  complete  activities  related  to  termination  and  close-out  of  the  Services,  including
fulfillment of any regulatory requirements;
(f)  the Company shall promptly (i) return to X4 all unused X4 Materials in its possession or control, unless otherwise directed in writing by X4
and  (ii)  return  to  X4  all  Confidential  Information  of  X4  in  its  possession  or  control;  provided  that  the  Company  may  retain  one  (1)  copy  of
Confidential  Information  of  X4  in  its  archives  solely  for  the  purpose  of  establishing  the  contents  thereof  and  ensuring  compliance  with  its
obligations hereunder;
(g)  in the sole discretion of X4, the Company shall either (i) promptly return to X4 all unused tangible materials in the Company’s possession or
control  that  are  obtained  by  the  Company  from  any  Third  Party  to  conduct  the  Services,  unless  otherwise  directed  in  writing  by  X4  or  (ii)
promptly refund to X4 the cost paid by X4 to the Company for such Third Party tangible materials; and
(h)  X4 shall promptly return to the Company all Confidential Information of the Company in its possession or control; provided that X4 may
retain  one  (1)  copy  of  Confidential  Information  of  the  Company  in  its  archives  solely  for  the  purpose  of  establishing  the  contents  thereof  and
ensuring compliance with its obligations hereunder.

6.4 Consequences of Termination or Suspension of a Statement of Work. In the event of the termination or suspension of a Statement of Work
pursuant to Section 6.1, the following provisions shall apply:
(a) the Company will terminate or suspend all Services in the applicable Statement or Work in progress in an orderly manner as soon as practical
and in accordance with a schedule agreed to by X4; and

(b) the Company will use reasonable efforts to re-allocate its personnel and mitigate costs and expenses incurred as a result of such termination or
suspension;
(c) in the sole discretion of X4, the Company shall either (i) promptly return to X4 all unused tangible materials in the Company’s possession or
control that are obtained by the Company from any Third Party to conduct the Services in the applicable Statement or Work, unless otherwise
directed in writing by X4 or (ii) promptly refund to X4 the cost paid by X4 to the Company for such Third Party tangible materials; and
(d) X4 will pay the Company any (i) Service Fees due and owing the Company under the applicable Statement or Work, up to the effective date of
termination  or  suspension,  for  Services  actually  performed  and  all  authorized  expenses  actually  incurred  (as  specified  in  the  applicable
Statement(s) of Work), and (ii) any non-cancelable costs incurred before the termination or suspension but paid after the effective termination or
suspension date that the Company is not able to mitigate.

6.5 Remedies; Injunctive Relief. Except as otherwise expressly set forth in this Agreement, the termination provisions of this Article 6 are in
addition to any other relief and remedies available to either Party under Applicable Laws. Each Party hereby acknowledges that any breach or
threatened breach of any of the terms of this Agreement may result in substantial, continuing and irreparable injury to the other Party and hereby
agrees that, in addition to any other remedy that may be available to that other Party, such other Party will be entitled to obtain injunctive relief
from the courts referred to in Section 7.1 below in the event of any breach or threatened breach of any of the terms of this Agreement.
6.6  Surviving Provisions. Notwithstanding any provision herein to the contrary, the rights and obligations of the Parties set forth in Articles 3, 4
and 7 and Sections 5.2, 5.3, 5.4, 5.5, 5.6, 6.3, 6.4 and 6.5, as well as any rights or obligations otherwise accrued hereunder, and any definitions
related to the foregoing, shall survive the termination of this Agreement or the expiration of the Term of this Agreement.

7. MISCELLANEOUS

7.1 Dispute Resolution.
7.1.1 Disputes.
(a) Resolution by Executive Officers. In the event of any controversy or claim arising from or relating to any provision of this
Agreement, or any term or condition hereof, or the performance by a Party of its obligations under this Agreement, or its construction or
the actual or alleged breach of this Agreement by a Party (each, a “Dispute”), either Party, upon written notice to the other Party, may
have such Dispute referred to the Parties’ respective Executive Officer(s) or their nominees, for attempted resolution by good faith
negotiations within thirty (30) days after such notice is received.
(b) Arbitration.
(i)  Selection of Arbitrators. In the event that any Dispute is not resolved as provided in Section 7.1.1(a) within thirty (30) days of the date
of notice of referral to the Executive Officers, either Party may, upon written notice to the other Party, submit the Dispute to final and
binding arbitration under the commercial arbitration rules of the American Arbitration Association (the “AAA”). The site of arbitration
shall be Boston, Massachusetts. The panel of arbitrators will be comprised of one arbitrator chosen by X4, one arbitrator chosen by the
Company and the third arbitrator by the two arbitrators so chosen. If either Party or both Parties fails to choose an arbitrator or arbitrators
within thirty (30) days after receiving notice of commencement of arbitration or if the two arbitrators fail to choose a third arbitrator
within thirty (30) days after their appointment, then either or both Parties shall immediately request that the AAA select the remaining
number of arbitrators to be selected, which arbitrator(s) shall have the requisite scientific background, experience and expertise.
(ii)  Additional Procedures. Either Party may apply to the arbitrators for interim injunctive relief until the arbitration decision is rendered
or the dispute is otherwise resolved. Either Party also may, without waiving any right or remedy under this Agreement, seek from any
court having jurisdiction any injunctive or provisional relief necessary to protect the rights or property of that Party pending resolution of
the dispute pursuant to this Section 7.1.1. The arbitrators shall have no authority to award punitive or any other type of damages not
measured by a Party’s compensatory damages. Each Party shall bear its own costs and expenses and attorneys’ fees in connection any
such arbitration; provided that the non-prevailing Party shall pay the costs and expenses incurred by the prevailing Party in connection
with any such arbitration, including reasonable attorneys’ fees and costs.

(iii)  Termination of Agreement. In the event of a Dispute involving the alleged breach of this Agreement (including, without limitation,
whether a Party has satisfied its diligence obligations hereunder), neither Party may terminate this Agreement until resolution of the
Dispute pursuant to this Section 7.1.
(iv) Decision of Arbitrators. The decision of the arbitrators shall be the sole, exclusive and binding remedy between the Parties regarding
the determination of all disputes presented. Any monetary payment to be made by a Party pursuant to a decision of the arbitrators shall be
made in United States dollars, free of any tax or other deduction.
(v)  Non-Disclosure. Except to the extent necessary to confirm an award or decision or as may be required by Applicable Laws, neither
Party nor any arbitrator may disclose the existence or results of any arbitration without the prior written consent of all Parties. In no event
shall any arbitration be initiated after the date when commencement of a legal or equitable proceeding based on the Dispute would be
barred by the applicable statute of limitations.

7.2 Governing Law. This Agreement will be construed, interpreted and applied in accordance with New York laws (excluding its body
of law controlling conflicts of law).
7.3 Limitations. Except as expressly set forth in this Agreement, neither Party grants to the other Party any right or license to any of its
intellectual property.

7.4 Entire Agreement. This Agreement and the Quality Technical Agreement finalized by the parties in December 2014 are the entire
agreements between of the Parties with respect to the subject matter hereof and supersedes all prior representations, understandings and
agreements between the Parties, whether written or oral, with respect to the subject matter hereof. No modification or amendment shall
be effective unless in writing with specific reference to this Agreement and signed by the duly authorized representatives of the Parties
(which writing and signature may be in a PDF document exchanged via e-mail).

7.5 Waiver. The terms or conditions of this Agreement may be waived only by a written instrument executed by the Party waiving
compliance. The failure of either Party at any time or times to require performance of any provision hereof shall in no manner affect its
rights at a later time to enforce the same. No waiver by either Party of any condition or term shall be deemed as a continuing waiver of
such condition or term or of another condition or term.

7.6 Headings. Section and subsection headings are inserted for convenience of reference only and do not form part of this Agreement.

7.7 Assignment. Neither this Agreement, nor any right or obligation hereunder, may be assigned, delegated or otherwise transferred, in
whole or part, by either Party without the prior express written consent of the other not to be unreasonably withheld, conditioned or
delayed; provided that either Party may, without the written consent of the other, assign this Agreement and its rights and delegate its
obligations hereunder to its Affiliates or in connection with the transfer or sale of all or substantially all of such Party’s assets or business
to which this Agreement relates or in the event of its merger, consolidation, change in control or similar transaction. Any permitted
assignee shall assume all obligations of its assignor under this Agreement. Any purported assignment in violation of this Section 7.7 shall
be void. The terms and conditions of this Agreement shall be binding upon and inure to the benefit of the permitted successors and
assigns of the Parties.

7.8 Force Majeure. Neither Party shall be liable for failure of or delay in performing its obligations set forth in this Agreement, and
neither Party shall be deemed in breach of its obligations, to the extent such failure or delay is due to causes beyond the reasonable
control of the affected Party, including, but not limited to, embargoes, war, acts of war (whether war be declared or not), acts of terrorism,
insurrections, riots, civil commotions, strikes, lockouts or other labor disturbances, fire, floods, or other acts of God, or acts, omissions or
delays in acting by any governmental authority (each, a “force majeure”), provided, that, X4 will not be excused from the payment of any
amounts otherwise due and payable to the Company under this Agreement

notwithstanding the occurrence of any such force majeure. The affected Party shall notify the other Party of such force majeure
circumstances as soon as reasonably practical, and shall promptly undertake all reasonable efforts necessary to cure such force majeure
circumstances.

7.9 Construction. The Parties hereto acknowledge and agree that: (a) each Party and its counsel reviewed and negotiated the terms and
provisions of this Agreement and have contributed to its revision; (b) the rule of construction to the effect that any ambiguities are
resolved against the drafting Party shall not be employed in the interpretation of this Agreement; and (c) the terms and provisions of this
Agreement shall be construed fairly as to all Parties hereto and not in favor of or against any Party, regardless of which Party was
generally responsible for the preparation of this Agreement.

7.10 Severability. If any provision(s) of this Agreement are or become invalid, are ruled illegal by any court of competent jurisdiction or
are deemed unenforceable under then current applicable law from time to time in effect during the Term hereof, it is the intention of the
Parties that the remainder of this Agreement shall not be affected thereby; provided that a Party’s rights under this Agreement are not
materially affected, the Parties hereto covenant and agree to renegotiate any such term, covenant or application thereof in good faith in
order to provide a reasonably acceptable alternative to the term, covenant or condition of this Agreement or the application thereof that is
invalid, illegal or unenforceable, it being the intent of the Parties that the basic purposes of this Agreement are to be effectuated.

7.11 Shipment. All Deliverables shipped by the Company will be shipped FCA the Company’s facilities (as such term is defined by
Incoterms 2010). Absent specific instructions from X4, the Company will select the carrier and ship freight prepaid, with the cost thereof
charged to X4.

7.12  Status. The Parties hereby acknowledge and agree that X4 and the Company shall be independent contractors and that nothing in
this Agreement is intended or shall be deemed to constitute a partner, agency, employer-employee or joint venture relationship between
the Parties. Neither X4 nor the Company shall have the authority to make any statements, representations or commitments of any kind, or
to take any action, which shall be binding on the other Party, without the prior written consent of the other Party.

7.13 Further Assurances. Each Party agrees to execute, acknowledge and deliver such further instructions, and to do all such other acts,
as may be necessary or appropriate in order to carry out the purposes and intent of this Agreement.

7.14 Complete Agreement. This Agreement incorporates in the entirety the Statements of Work, Change Orders and, when appropriate,
any Quality Technical Agreement (“Ancillary Agreements”). In the event of any ambiguity, doubt or conflict, the terms and conditions of
this Agreement will take precedence over any terms and conditions which appear in Ancillary Agreements save that a Quality Technical
Agreement shall take precedence in relation to quality issues. For the sake of clarity the Parties acknowledge and agree that any changes
to any of the terms in this Agreement may only be made by agreed amendments to this Agreement and may not be made in any Ancillary
Agreements.

7.15 Counterparts. This Agreement may be executed simultaneously in one 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.]

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by their respective duly authorized

representatives.

X4 PHARMACEUTICALS, INC.

By: /s/ Paula M. Ragan

Name: Paula M. Ragan, PhD.

Title: CEO

 APTUIT (OXFORD) LTD.

By: /s/ Petra Dieterich

Name: Petra Dieterich

Address for purposes of notification:

  Address for purposes of notification:

784 Memorial Drive, Suite 140

Cambridge, MA 02139

Aptuit (Oxford) Limited

111 Innovation Drive, Milton Park, Abingdon
Oxfordshire

OX14 4RZ Oxford

England

Attn: Contract Negotiations Department

EXHIBIT A

PROJECT PLAN

[To be attached]

FORM OF STATEMENT OF WORK

EXHIBIT B

THIS STATEMENT OF WORK (the "Statement of Work") is by and between X4 Pharmaceuticals, Inc. (“X4”) and
Aptuit (Oxford) Ltd. (the “Company”) and upon execution will be incorporated into the Master Services Agreement between X4
and  the  Company  dated  February  19,  2016  (the  “Agreement”).  Capitalized  terms  in  this  Statement  of  Work  will  have  the  same
meaning as set forth in the Agreement.

X4 hereby engages the Company to provide Services, as follows:

1. Project. The Company will render to X4 the following Services in connection with the following Project:

[To be agreed upon by the Parties]

2. X4 Materials.

X4 will provide the Company with the following X4 Materials in connection with the Project:

[Describe specific X4 Materials being provided by X4]

The Storage Guidelines for the X4 Materials are as follows:

[Describe Storage Guidelines]

3. X4 Confidential Information/X4 Background Technology.

X4 will provide the Company with the following X4 Confidential Information/X4 Background Technology in connection with the

Project:

[Describe X4 Confidential Information provided by X4]

4. Timelines and Deliverables.

The Services will be completed within INSERT TIME PERIOD. The Deliverables to be established for the Project include:
INSERT Deliverable

5. Project Leaders.

X4:
Company:

6. Compensation.

Estimated Total Service Fees for Project (“Total Service Fees”):

All amounts due under this Statement of Work will be invoiced in United States Dollars to accounts.payable @x4pharma.com

according to the following schedule: [INVOICE SCHEDULE].

7. Right to Terminate Project:

[Describe termination rights specific to Project.]

8. Additional Rights Applicable to Project.

In the event of a discrepancy between any terms or conditions set forth in the Statement of Work and any attachments thereto and

the Agreement, the terms of the Agreement shall govern.

All other terms and conditions of the Agreement will apply to this Statement of Work.

STATEMENT OF WORK AGREED TO AND ACCEPTED BY:

X4 PHARMACEUTICALS, INC. APTUIT (OXFORD) LTD.

By: By:

Print Name Title

Print Name: Title:

duly authorized duly authorized

Date Date

AMENDMENT NO. 1 TO MASTER SERVICES AGREEMENT

Exhibit 10.39

This amendment (the "Amendment") to the Master Services Agreement by and between X4 Pharmaceuticals, Inc., a Delaware corporation with a business
address at 784 Memorial Drive, Suite 140, Cambridge, MA 02139 ("X4"), and Aptuit (Oxford) Limited, incorporated in England and Wales, having an
address  at  111  Innovation  Drive,  Milton  Park,  Abingdon,  Oxfordshire,  OX14  4RZ,  England  (the  "Company"),  dated  February  19,  2016  (the
"Agreement"), incorporated by reference herein, is effective on 23rd November 2016 (the "Effective Date").

RECITALS

WHEREAS, X4 and Company wish to add the Affiliates of Company (as listed in Annex A hereto) to the Agreement such that they can provide Services
under the Agreement, effective 23rd November 2016; and

WHEREAS, this Amendment sets out and/or refers to the additional terms and conditions upon which such change shall be undertaken.

Now, THEREFORE, in consideration of the foregoing and the mutual covenants and promises contained in this Amendment, the parties hereto agree as
follows:

1.  Defined terms in the Agreement shall have the same meaning in this Amendment.

2. With X4's prior written consent, the Company may use the Services of its corporate Affiliates to fulfil Aptuit's obligations under the Agreement. Any
Affiliate so used shall be subject to all of the terms and conditions applicable to the Company under the Agreement and entitled to all rights and
protections afforded to the Company under the Agreement. For the avoidance of  doubt,  a  fully  executed  Statement  of  Work  clearly  stating  the
intention to use Company's Affiliates shall suffice for the aforementioned prior written consent.

3. Save as otherwise expressly referred to in this Amendment the terms and conditions of the Agreement shall apply in all other respects and remain in full

force and effect.

[Remainder of Page Intentionally Left Blank]

IN WITNESS WHEREOF, the parties hereto have executed this AMENDMENT on the Effective Date.

X4 PHARMACEUTICALS, INC.

APTUIT (OXFORD) LIMITED

By: /s/ John Celebi

Printed Name: John Celebi

Title: Chief Operating Officer

By: /s/ Petra Dieterich

Printed Name: Petra Dieterich

Title: Senior Director API, Head of Site

Subsidiaries

Exhibit 21.1

The following is the name, jurisdiction of organization and percentage ownership by the Company of its subsidiaries.

Subsidiary

Jurisdiction of Incorporation

X4 Pharmaceuticals, Inc.
X4 Pharmaceuticals (Austria) GmbH
X4 Pharmaceuticals Securities Corporation
X4 Therapeutics Inc.

Delaware
Austria
Massachusetts
Delaware

Company Owned by
Percentage
100%
100%
100%
100%

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 23.1

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (Nos. 333-229377 and 333-233161) and Form S-8 (Nos.
333-221622, 333-223539, 333-230181, 333-230499, and 333-233162) of X4 Pharmaceuticals, Inc. of our report dated March 12, 2020 relating to the
financial statements, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
March 12, 2020

I, Paula Ragan, Ph.D., certify that:

1.

I have reviewed this Annual Report on Form 10-K of X4 Pharmaceuticals, Inc.;

CERTIFICATION

Exhibit 31.1

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 12, 2020

/s/ Paula Ragan, Ph.D.

Paula Ragan, Ph.D.
President, Chief Executive Officer and Secretary
(Principal Executive Officer)

I, Adam S. Mostafa, certify that:

1.

I have reviewed this Annual Report on Form 10-K of X4 Pharmaceuticals, Inc.;

CERTIFICATIONS

Exhibit 31.2

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 12, 2020

/s/ Adam S. Mostafa

Adam S. Mostafa
Chief Financial Officer and Treasurer
(Principal Financial Officer)

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

I, Paula Ragan, Ph.D., certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge, the Annual Report on Form 10-K of X4 Pharmaceuticals, Inc. for the fiscal year ended December 31, 2019 fully complies with the
requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-K fairly presents, in
all material respects, the financial condition and results of operations of X4 Pharmaceuticals, Inc.

/s/ Paula Ragan, Ph.D.

Name: Paula Ragan, Ph.D.

Title: President, Chief Executive Officer and Secretary

(Principal Executive Officer)

March 12, 2020

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

I, Adam S. Mostafa, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge, the Annual Report on Form 10-K of X4 Pharmaceuticals, Inc. for the fiscal year ended December 31, 2019 fully complies with the
requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in such Form 10-K fairly presents, in
all material respects, the financial condition and results of operations of X4 Pharmaceuticals, Inc.

/s/ Adam S. Mostafa

Name: Adam S. Mostafa.

Title: Chief Financial Officer and Treasurer

(Principal Financial Officer)

March 12, 2020