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Unity Biotechnology, Inc.

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FY2021 Annual Report · Unity Biotechnology, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)
☒

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

For the fiscal year ended December 31, 2021
OR

☐

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

Commission File Number 001-38470

Unity Biotechnology, Inc.

(Exact name of Registrant as specified in its Charter)

Delaware
( State or other jurisdiction of
incorporation or organization)
285 East Grand Ave.
South San Francisco, CA
(Address of principal executive offices)

26-4726035
(I.R.S. Employer
Identification No.)

94080
(Zip Code)

Registrant’s telephone number, including area code: (650) 416-1192

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

Title of each class
Common Stock, par value $0.0001

Trading Symbol(s)
UBX

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

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

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES ☐ NO ☒
Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding
12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES ☒ NO ☐
Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of
this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). YES ☒ NO ☐

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

Accelerated filer
Smaller reporting company

  ☐  
  ☒  
  ☒  

  ☐
  ☒

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

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

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES ☐ NO ☒
The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the shares of common stock on The
Nasdaq Global Select Market on June 30, 2021 was $202,106,452.

The number of shares of Registrant’s Common Stock outstanding as of March 10, 2022 was 68,927,851.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s Definitive Proxy Statement relating to the 2022 Annual Meeting of Shareholders, scheduled to be held on [June 24], 2022, are incorporated by reference
into Part III of this Report. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the end of the fiscal year covered by this Annual
Report on Form 10-K.

 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
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.
Item 9C.

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
[Reserved]
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information
Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

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

Exhibits, Financial Statement Schedules
Form 10-K Summary
Signatures

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Forward-Looking Statements

This Annual Report on Form 10-K contains “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of
1934,  as  amended,  or  the  Exchange  Act.  All  statements  other  than  statements  of  historical  facts  contained  in  this  Annual  Report  on  Form  10-K  are
statements that could be deemed forward-looking statements reflecting the current beliefs and expectations of management with respect to future events or
to our future financial performance and involve known and unknown risks, uncertainties, and other factors that may cause our actual results, performance
or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements.
These  statements  are  often  identified  by  the  use  of  words  such  as  “aim,”  “anticipate,”  “assume,”  “believe,”  “contemplate,”  “continue,”  “could,”  “due,”
“estimate,” “expect,” “goal,” “if,” “intend,” “may,” “objective,” “plan,” “predict,” “potential,” “positioned,” “seek,” “should,” “target,” “will,” “would,”
“until,” and similar expressions or variations. Forward-looking statements contained in this Annual Report on Form 10-K include, but are not limited to,
statements about:

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our expectations regarding the potential benefits, activity, effectiveness, and safety of our drug candidates;

our  expectations  with  regard  to  the  results  of  our  clinical  studies,  preclinical  studies,  and  research  and  development  programs,  including  the
timing and availability of data from such studies;

our preclinical, clinical, and regulatory development plans for our drug candidates, including the timing or likelihood of regulatory filings and
approvals for our drug candidates;

our expectations with regard to our ability to acquire, discover, and develop additional drug candidates and advance such drug candidates into,
and successfully complete, clinical studies;

our  expectations  regarding  the  potential  market  size  and  size  of  the  potential  patient  populations  for  our  drug  candidates,  if  approved  for
commercial use;

our intentions and our ability to establish collaborations and/or partnerships;

the timing and amount of any milestone payments we are obligated to make pursuant to our existing license agreements and any future license or
collaboration agreements that we may enter into;

our commercialization, marketing, and manufacturing capabilities and expectations;

our intentions with respect to the commercialization of our drug candidates;

the pricing and reimbursement of our drug candidates, if approved;

the implementation of our business model and strategic plans for our business and drug candidates, including additional indications which we
may pursue;

the scope of protection we are able to establish and maintain for intellectual property rights covering our drug candidates, including the projected
terms of patent protection;

estimates of our expenses, future revenue, capital requirements, our needs for additional financing, and our ability to obtain additional capital;

developments and projections relating to our competitors and our industry, including competing therapies; and

other risks and uncertainties, including those listed under the caption “Risk Factors.”

We caution you that the foregoing list may not contain all of the forward-looking statements made in this Annual Report on Form 10-K.

Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or
achievements to be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements. We
discuss these risks in greater detail in “Risk Factors” and elsewhere in this Annual Report on Form 10-K. Given these uncertainties, you should not place undue
reliance on these forward-looking statements. Also, forward-looking statements represent our management’s beliefs and assumptions only as of the date of this
Annual  Report  on  Form  10-K.  Except  as  required  by  law,  we  assume  no  obligation  to  update  these  forward-looking  statements  publicly,  or  to  update  the
reasons actual results could differ

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materially from those anticipated in these forward-looking statements, even if new information becomes available in the future.

This  Annual  Report  on  Form  10-K  also  contains  estimates,  projections,  and  other  information  concerning  our  industry,  our  business  and  the
markets for certain drugs, including data regarding the estimated size of those markets, their projected growth rates, and the incidence of certain medical
conditions. Information that is based on estimates, forecasts, projections or similar methodologies is inherently subject to uncertainties, and actual events or
circumstances  may  differ  materially  from  events  and  circumstances  reflected  in  this  information.  Unless  otherwise  expressly  stated,  we  obtained  this
industry, business, market, and other data from reports, research surveys, studies, and similar data prepared by third parties, industry, medical and general
publications, government data, and similar sources. In some cases, we do not expressly refer to the sources from which this data is derived. In that regard,
when we refer to one or more sources of this type of data in any paragraph, you should assume that other data of this type appearing in the same paragraph
is derived from the same sources, unless otherwise expressly stated or the context otherwise requires.

Trademarks

This Annual Report on Form 10-K includes trademarks, service marks, and trade names owned by us or other companies. All trademarks, service

marks and trade names included in this Annual Report on Form 10-K are the property of their respective owners.

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PART I

Item 1. Business.

Overview

Our mission is to slow, halt, or reverse diseases of aging. Our initial focus is on creating senolytic medicines to selectively eliminate senescent

cells and thereby treat diseases of aging, such as ophthalmologic diseases, with the opportunity to explore neurology and other therapeutic areas.

Diseases of aging cause considerable economic, personal, and societal burden. As individuals age, the prevalence of chronic disease increases,
with 80% of older Americans having at least one chronic disease and 50% having two or more. Diseases of aging negatively impact quality of life, are
typically chronic, and progress from the time of onset until death. It is estimated that providing healthcare for people over the age of 65 costs four to five
times more than for younger individuals. According to the United States Census Bureau, this elderly population of Americans is expected to increase nearly
50% by 2050, increasing the economic burden of aging dramatically. Any success increasing longevity without treating underlying diseases of aging would
only serve to increase this burden.

We believe that by creating medicines that target fundamental aging mechanisms, we can reduce the economic, personal, and societal burden of

aging and enhance quality of life.

In February 2022, we announced a restructuring to align resources to focus on our ongoing clinical programs and deliver on key development
milestones. These actions to prioritize our ophthalmology programs and implement cost saving measures were designed to enable us to achieve multiple
key clinical data readouts for UBX1325 as well as support the Tie2 and Tie2/VEGF bispecific program through advanced candidate nomination, with all
other pipeline programs paused to focus resources on these advanced programs.

Targeting Cellular Senescence and Other Biologies of Aging

We  believe  that  the  accumulation  of  senescent  cells  is  a  fundamental  mechanism  of  aging  and  a  driver  of  many  common  diseases  of  aging.
Cellular  senescence  is  a  natural  biological  state  in  which  a  cell  permanently  halts  division.  These  cells  are  referred  to  as  senescent.  Senescent  cells
accumulate with age, secreting large quantities of more than 100 proteins, including inflammatory factors, proteases, fibrotic factors, and growth factors,
that disturb the tissue micro-environment. This collection of secreted proteins is referred to as the Senescence Associated Secretory Phenotype, or SASP. In
addition  to  its  effects  on  tissue  function,  the  SASP  contains  factors  that  induce  senescence  in  neighboring  cells,  setting  off  a  cascade  of  events  that
culminates in the formation of the functionally aged and/or diseased tissue that underlies a variety of age-related diseases.

We are developing senolytic medicines to eliminate senescent cells and thereby lower the production of the SASP, which we believe addresses a
root cause of age-related diseases. Many existing therapeutics, such as antibodies, target single SASP factors, but fail to remove the cells that continually
produce these factors. By stopping the production of the SASP at it source, we believe senolytic medicines could have a more durable impact by slowing,
halting,  or  reversing  particular  diseases  of  aging,  and  shift  the  treatment  paradigm  from  chronic  to  intermittent  dosing.  Less  frequent  dosing  may  also
improve drug tolerability and patient adherence.

While our primary focus is on programs targeting cellular senescence, we are exploring other biologies of aging that may have a major impact on
diseases of aging. For instance, we have a preclinical program targeting Tie2 signaling. Tie2 is a receptor tyrosine kinase that is implicated in regulating
barrier function in blood vessels of the eye, which are affected in several prevalent eye diseases. Tie2 is also implicated in kidney disease. We also have a
preclinical program targeting both Tie2 and VEGF (Tie2/VEGF bispecific) designed to neutralize VEGF and activate Tie2, two major pathways involved in
retinal  disease.  We  have  outlicensed  our  program  in  α-Klotho,  a  protein  that  has  been  implicated  in  human  cognition  and  may  provide  benefits  in  age-
related cognitive dysfunctions.

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Our Pipeline

We are targeting specific biological mechanisms implicated in diseases of aging. Our core therapeutic approach targets cellular senescence, and
we  are  currently  advancing  senolytic  programs  primarily  in  ophthalmologic  disorders.  In  addition,  we  are  advancing  other  programs  based  on  other
biologies of aging to include an agonistic antibody to the Tie2 receptor and a Tie2/VEGF bispecific to treat vascular eye disease.  

Ophthalmology Program

UBX1325 is our most advanced lead drug candidate for age-related diseases of the eye, including diabetic macular edema, or DME, age-related
macular  degeneration,  or  AMD,  and  diabetic  retinopathy,  or  DR.  UBX1967  is  our  back-up  compound  to  UBX1325.  Each  of  these  drug  candidates  are
potent small molecule inhibitors of Bcl-xL, a member of the Bcl-2 family of apoptosis regulating proteins, and has shown distinct tissue residence time
profiles  in  preclinical  studies.  UBX1325  and  UBX1967  are  designed  to  inhibit  the  function  of  proteins  that  senescent  cells  rely  on  for  survival.  In  our
preclinical studies, we have demonstrated that targeting Bcl-xL with UBX1325 and UBX1967 preferentially eliminated senescent cells from diseased tissue
while sparing cells in healthy tissue. In July 2020, we filed an Investigational New Drug application, or IND, to commence a Phase 1 study of UBX1325.
In  October  2020,  we  dosed  our  first  patient  in  a  Phase  1  clinical  study  of  UBX1325  to  evaluate  ocular  and  systemic  safety  and  tolerability  of  a  single
intravitreal  injection  of  UBX1325  by  the  incidence  of  dose  limiting  toxicities  and  treatment  emergent  adverse  events  reported  up  to  24  weeks  after
administration. Based on prospectively determined safety criteria, the Phase 1 study was able to dose-escalate beyond the originally planned 5 mcg dose up
to 10 mcg, which informed the final dose for the Phase 2a study in DME. In July 2021, we announced positive 8-week data from this Phase 1 study of
UBX1325 in patients with DME and nAMD for whom anti-VEGF therapy was no longer considered beneficial. On October 5, 2021 we announced 12-
week data, on November 9, 2021 we announced 24-week data, and on February 14, 2022 we announced 24-week data from an additionally-enrolled cohort
of  patients  with  AMD.  UBX1325  was  well-tolerated  with  no  signs  of  intraocular  inflammation  or  other  related  ocular  adversities,  and  no  dose-limiting
toxicities or adversities that preclude advancing UBX1325 into later stage clinical development. In DME, following a rapid improvement in BCVA, a mean
improvement of 9.5 ETDRS letters from baseline at 6 months in the higher dose cohorts (5, 10 mcg) and 6.9 ETDRS letters from baseline at 6 months in all
dose cohorts was observed. In AMD, following a rapid improvement in BCVA, there were improvements or stabilization of both BCVA and CST through 6
months post-injection. In both diseases, the majority of patients treated with UBX1325 showed durable improvement in vision and did not meet objective
rescue criteria requiring standard of care anti-VEGF treatment. Among patients who received anti-VEGF rescue, there was minimal change in either mean
BCVA or CST following treatment in all but one AMD patient.

In May 2021, we initiated our Phase 2a proof-of-concept study to evaluate the safety, efficacy, and durability of a single intravitreal injection of
UBX1325 in a broader population of patients with DME and dosed our first patient in June 2021. Approximately 62 patients will be enrolled, randomized
evenly between UBX1325 and sham-injected patients. An analysis of 12-week safety and efficacy data is expected by mid-2022, and patients will continue
to be followed through 48 weeks post-treatment in a long-term follow-up. Endpoints being explored in the study include safety and tolerability, changes in
BCVA, CST, SRF/IRF, proportion of patients requiring rescue treatment, and durability of effects.

In March 2022 we also enrolled our first patient in our Phase 2 proof-of-concept study in wet, or neovascular, AMD. This study is expected to
randomize 46 patients with wet AMD who have had at least three intravitreal injections of anti-VEGF therapy in the preceding six months and who have
residual sub- or intra-retinal fluid. Patients will have received their last anti-VEGF treatment approximately 4-8 weeks prior to screening, and all patients
will be followed for approximately 24 weeks after dosing with either UBX1325 or aflibercept. We expect to share 16-week data from this Ph2 study in wet
AMD in the fourth quarter of 2022.

Under  our  current  amended  license  agreement  with  Ascentage  Pharma  Group  Corp.  Limited,  or  Ascentage,  we  have,  among  other  things,
exclusive  worldwide  development  and  commercialization  rights  and  non-exclusive  manufacturing  rights  to  UBX1325  outside  of  Greater  China  (China,
Hong Kong, Macau and Taiwan) in all non-oncology indications. Inside Greater China, we will be obligated to develop, manufacture and commercialize
UBX1325 through a joint venture with Ascentage. See “—Licenses and Collaborations.”

We also have a Tie2/VEGF bispecific program. Tie2 is a receptor tyrosine kinase that is implicated in regulating barrier function in blood vessels
of the eye, which are affected in several prevalent eye diseases. Tie2 is an important key regulator of the vascular endothelium in the eye and dysregulation
of this pathway leads to loss of

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barrier  integrity  and  healthy  vasculature.  Preliminary  studies  suggest  that  cellular  senescence  in  aging  eyes  may  induce  Ang-2  and  therefore  deactivate
Tie2, leading ocular edema.

The  Tie2/VEGF  bispecific  has  dual  functionality  on  two  validated  targets  for  retinal  diseases.  In  addition  to  direct  activation  of  Tie2,  the
bispecific candidate is designed to neutralize VEGF-A and VEGF-B. We believe that direct agonism of Tie2 may be superior to antagonism of Ang2 which
relies on adequate levels of endogenous Ang1 to activate the Tie2 pathway. We have identified Tie2/VEGF bispecific molecules that have pharmacological
activity  on  Tie2  and  VEGF  with  potencies  relevant  for  clinical  benefit.  Based  on  supporting  preclinical  data,  we  expect  to  designate  an  Advanced
Candidate by mid-2022. We also seek to initiate pilot preclinical toxicology experiments to support nomination of a Development Candidate that should
enable initiation of IND-enabling studies in the second half of 2023.

UBX2050 is our investigational, fully human anti-Tie2 agonist monoclonal antibody. Tie2 dysregulation is implicated in eye disease as well as
other indications. UBX2050 is derived from an asset that was acquired from Achaogen, Inc. in June 2020 through an Asset Purchase Agreement. UBX2050
was selected based on its potential to activate the Tie2 receptor in vitro and has demonstrated encouraging activity in preclinical models of ocular disease.
We believe UBX2050 may be an orthogonal approach to restoring barrier function and vascular function and are exploring a number of indications for
UBX2050, expecting to nominate a Development Candidate in 2022.

Neurology Program

We  believe  cellular  senescence  may  play  a  fundamental  role  in  neurodegeneration.  Multiple  lines  of  evidence  suggest  that  senescent  cells
accumulate in the nervous system during normal aging and neurodegenerative diseases. Several third-party preclinical proof of concept studies in mouse
models of aging and neurodegeneration have provided preliminary evidence that the removal of senescent cells via senolytic drugs or genetic methods have
the potential to improve brain function.

UBX2089, an α-Klotho hormone drug candidate, is a circulating hormone primarily produced in the kidneys and choroid plexus of the brain,
which is being researched for multiple neurology indications. Human genetic evidence links α-Klotho to cognitive function, and we have observed pro-
cognitive activity of recombinant α-Klotho in multiple preclinical rodent and non-human primate models. Our work focused on investigating the effect of
UBX2089 on engaging CNS circuits in preclinical animal models with the intent of advancement to clinical studies, and in December 2021, we announced
an exclusive licensing agreement of our α-Klotho asset to Jocasta Neuroscience, Inc. for development and commercialization.

Our Approach to Slowing, Halting, or Reversing Diseases of Aging

Targeting Cellular Senescence

Cellular senescence is a natural biological state in which a cell permanently halts division. Cells become senescent when they experience some
form of unresolvable cellular stress. These cellular stress events result in the activation of the tumor suppressor protein p53, which drives the production of
two  cell-cycle  dependent  kinase  inhibitors,  or  CDK  inhibitors,  p21  and  p16.  These  two  molecules  are  required  for  the  establishment  and  subsequent
maintenance of the senescent cell state. The first CDK inhibitor to be produced is p21, which works through subsequent pathways to block the production
of numerous proteins that cells need to divide. The initial p21-driven signal is an acute response to cell damage and eventually decreases. In contrast, p16
permanently locks the cell into a non-dividing state and the production of p16 continues as long as the cell lives. Given that p16 production, in most cases,
continues indefinitely and is believed to be produced almost exclusively in senescent cells, it is a widely used marker to identify and quantify senescent
cells.

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The process through which stress mechanisms can induce cells to become senescent is illustrated in the figure below.

Figure 1: Illustration of induction of the senescent state and secretion of factors that can damage the microenvironment

How Senescent Cells Drive Diseases of Aging

Once  cells  become  senescent,  they  begin  secreting  large  quantities  of  proteins,  including  pro-inflammatory  factors  that  recruit  the  immune
system,  proteases  that  remodel  the  extra-cellular  matrix,  pro-fibrotic  factors  that  drive  the  formation  of  dysfunctional  matrix,  and  growth  factors  that
perturb the function of the tissue micro-environment. This collection of secreted proteins is referred to as the Senescence Associated Secretory Phenotype,
or SASP. In addition to affecting normal tissue function, the SASP contains factors that induce senescence in neighboring cells, setting off a cascade of
events that ultimately culminates in the formation of a functionally aged and/or diseased tissue that underlies a variety of age-related diseases.

Numerous SASP factors have been implicated as potentially contributing to human disease and it is now believed that the SASP is the primary
means  by  which  senescent  cells  drive  specific  diseases  of  aging.  For  example,  a  variety  of  single  SASP  factors  (e.g.,  TNF-α  and  VEGF-A)  have  been
demonstrated to drive human diseases by themselves and have been the target of well-known antibody therapeutics, including HUMIRA® and EYLEA®.
While these antibodies are able to modify human disease by removing the activity of a single factor, we believe the clearance of senescent cells will remove
the source of numerous SASP factors, providing improvement in both efficacy and duration-of-effect.  

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Our Therapeutic Paradigm

We were founded on the principle that the selective elimination of senescent cells and their accompanying SASP has the potential to slow, halt,
or reverse diseases of aging. Our insights into senescent cell biology allow us to identify senescence-driven diseases, target the senescent cells driving a
particular disease, and selectively eliminate these cells. The figure below illustrates this process.

Figure 2: Illustration of the senolytic therapeutic hypothesis

In  developing  this  approach,  we  have  acquired  significant  expertise  with  respect  to  senescent  cell  survival  pathways,  which  are  the  signaling
systems  that  senescent  cells  rely  on  for  survival.  When  these  pathways  are  targeted  with  specifically  designed  molecules,  senescent  cells  undergo
programmed cell death. Through our research, we have identified several of these mechanistically distinct survival pathways, which differ depending on
cell type and the tissue in which the senescent cells reside.

Advantages of Our Approach

We  believe  that  senolytic  medicines  that  selectively  eliminate  senescent  cells  from  diseased  tissues  may  have  several  advantages  over  other

efforts to treat diseases of aging:

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•

•

Senolytic medicines target a root cause of diseases of aging.    We believe that the accumulation of senescent cells is a root cause of many
diseases of aging. Unlike treatments that inhibit the activity of a single factor (such as antibodies targeting single pro-inflammatory proteins), we
believe a senolytic medicine that eliminates accumulated senescent cells and consequently also their associated SASP, could blunt the activity of
numerous  factors  contributing  to  disease.  As  a  result,  senolytic  medicines  could  have  improved  efficacy  because  they  target  diseases  at  their
source and therefore may be able to normalize tissue levels of numerous disease-causing factors simultaneously.

Senolytic  medicines  can  be  dosed  intermittently.        The  administration  of  senolytic  medicines  would  remove  senescent  cells  from  diseased
tissue. As new senescent cells may take months or perhaps years to re-accumulate, senolytic medicines could potentially be dosed infrequently.
Intermittent dosing may also improve drug tolerability and patient adherence when compared to chronic therapies.

Senolytic medicines restore tissues to a healthy state.    We believe senescent cells generally do not accumulate in young individuals and that the
accumulation of senescent cells in older individuals interferes with normal tissue function. Our goal for the administration of senolytic medicines
is to restore tissue to a functionally younger state.

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Ophthalmology Programs Targeting Cellular Senescence

Unmet Need and Therapeutic Rationale

Our Programs

The majority of significant eye diseases are age-related, with the prevalence of vision-threatening disease increasing significantly over the age of
75. Of the 285 million individuals worldwide living with visual impairment, 65% are over the age of 50. The individual diseases that are associated with
these  figures  include  age-related  macular  degeneration,  diabetic  macular  edema,  and  diabetic  eye  diseases,  all  of  which  have  a  high  prevalence  and
significant unmet need in either prevention or therapeutic options. The diseases we are evaluating as initial target indications for local administration of
senolytic therapy in the eye are age-related macular degeneration, diabetic macular edema, and diabetic retinopathy.

Diabetic Macular Edema

Diabetic macular edema is a condition in which the metabolic abnormalities associated with diabetes, including high levels of blood glucose, or
hyperglycemia,  damage  blood  vessels  in  the  central  portion  of  the  retina,  or  the  macula,  causing  those  vessels  to  leak  fluid.  The  leaking  fluid  leads  to
swelling and subsequently to abnormalities of vision. The prevalence of diabetic macular edema, or DME, in the United States ranges from approximately
4.0% to 6.8% of people with diabetes who are 40 years of age or older. In 2019, it was estimated that more than 20 million people worldwide are affected
by  DME.  There  is  a  high  burden  of  DME  among  non-Hispanic  blacks  and  robust  associations  with  higher  hemoglobin  A1c  and  longer  duration  of
underlying diabetes.

Despite the success achieved with anti-VEGF treatment for retinal disease like AMD that involve the proliferation of abnormal blood vessels, or
neovascularization, the impact of such treatment in DME has been more limited. This is due to the challenging nature of the therapeutic regimen (which
entails monthly and or bimonthly IVT injections for up to two years), the number of cases that are refractory to anti-VEGF treatment (approximately 50%
of  DME  patients),  and  the  long-term  complications  of  increased  ischemia  and  retinal  fibrosis  associated  with  long-term  treatment  with  anti-VEGF
injections. As a result, there is an unmet need in this group of patients. Although VEGF has been identified as a major factor for neovascular disease, other
factors, which we believe include SASP factors, are present in DME, including IL-1ß, TNF-a, IL-6, and TGF-ß, among others. Due to the multifactorial
nature of the disease, a significant opportunity exists to develop a more comprehensive approach to the treatment of DME, such as senolysis, that targets
the root cause of the disease.

Age-Related Macular Degeneration

Age-related macular degeneration, or AMD, is the leading cause of irreversible vision loss in developed countries, particularly in people older
than 60 years. In 2014, it was projected that by 2020 the number of people worldwide with AMD would be 196 million and could increase to 288 million
by 2040. The prevalence of AMD increases significantly with advancing age, with a prevalence rate of 1.63% in those aged 65 to 69 years which increases
to 11.73% in those aged 80 years or older. AMD affects central vision, impairing functions such as reading, driving, and facial recognition, and has a major
impact  on  quality  of  life  and  the  ability  to  live  independently.  AMD  is  defined  in  three  stages:  (i)  “early,”  in  which  visual  function  is  affected  in  the
presence of signs of age-related changes in the retina such as drusen and pigmentary changes; (ii) “intermediate,” in which increasing degrees of macular
lipid deposition and structural changes are noted; and (iii) “late,” in which central vision is compromised due to abnormal blood vessel growth (known as
“wet”  AMD)  or  advanced  atrophy  of  the  retina  (known  as  “dry”  AMD).  AMD  is  a  heterogenous,  complex,  multifactorial  disease,  with  inflammatory,
degenerative,  genetic,  and  vascular  factors  all  contributing  to  its  development  and  progression.  The  potential  role  of  senescent  cells  and  the  associated
SASP in driving the two main presentations of the disease, both wet and dry forms, could prove a unifying mechanism across this complex disorder.

Current standard of care for AMD is the administration of anti-vascular endothelial growth factor, or anti-VEGF, antibody drugs which control
aspects of the wet form of the disease only. The development of therapeutic options for dry AMD has proven to be challenging and currently there are no
approved therapies available to halt

10

 
progression  or  reverse  disease.  And  while  wet  AMD  has  been  significantly  impacted  by  anti-VEGF  therapy,  that  approach  is  limited  by  the  need  for
frequent eye injections over a long period of time, a significant percentage of patients not completing or being non-responsive or poorly-responsive to anti-
VEGF therapy, and the contribution of multiple other mechanisms at play in the disease beyond VEGF. Thus, there is considerable potential for a senolytic
approach  to  impact  disease  progression  and  achieve  stabilization  in  AMD  via  modulation  of  senescent  cell  burden  and  the  accompanying  SASP.  SASP
factors in AMD include molecules that promote abnormal blood vessel growth, inflammation, and fibrosis, all of which have been implicated in various
stages of the disease. We believe that a senolytic medicine could have a meaningful and prolonged impact on the AMD disease state and help restore the
cellular microenvironment to a more normal, pre-senescent state.

Diabetic Retinopathy

Diabetic retinopathy, or DR, is estimated to affect over 90 million people globally and approximately 28 million have vision-threatening stages of
disease. It is a leading cause of vision loss in middle-aged and elderly people and impacts 8% of the U.S. population over age 65. Due to the increasing
diabetic population arising from lifestyle changes in developing countries, the disease incidence is predicted to climb.

Diabetic  retinopathy  is  a  complex  multifactorial  disease,  characterized  by  progression  through  a  series  of  stages  of  increasing  severity.  The
metabolic abnormalities associated with diabetes incite a variety of inflammatory and metabolic stress-induced events which leads to proliferation of new
blood vessels and subsequent bleeding and swelling, which in turn causes scarring and vision loss or may lead to blood vessel occlusion, limiting blood
flow and leading to damage to the retinal photoreceptors and nerves supplied by those vessels. The risk of developing diabetic retinopathy and its severity
increase with the duration of underlying diabetes. It is also associated with poor glycemic control and the presence of additional coexistent diseases, such as
high blood pressure, high cholesterol levels, and impaired kidney function.

Current standard of care for diabetic retinopathy, which includes blood sugar control, anti-VEGF drugs, steroid injections, and laser therapy, is
modestly  effective.  The  limitations  of  existing  therapy  include  general  challenges  with  achieving  diabetes  control,  the  need  for  frequent  intravitreal
injections for the administration of anti-VEGF therapy, a significant percentage of patients not completing or being non-responsive to anti-VEGF therapy,
and tissue destruction with permanent side effects from laser therapy. This presents a significant opportunity to design and develop a treatment paradigm,
such as senolysis, that treats a root cause of the disease.

Evidence suggests that diabetic retinopathy is driven by the accumulation of senescent cells that are a direct result of elevated glucose levels in
patients with diabetes. These senescent cells are triggered by local stresses in the retina and their accumulation drives the production of the accompanying
ocular SASP factors, VEGF and platelet-derived growth factor, or PDGF. Overproduction of VEGF and IL-6 leads to ocular inflammation and abnormal
blood vessel growth, key signatures of diabetic retinopathy. Thus, a senolytic approach could target multiple aspects of the underlying causes of diabetic
retinopathy and ideally lead to greater therapeutic coverage in a wider range of patients. This elimination of senescent cell accumulation and accompanying
SASP factors could limit further disease progression, reduce vessel leakage and inflammation, and prevent vision loss.

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Evidence for Senescence Burden in Human Disease and Human Biomarker Discovery: AMD, DR and DME

We evaluated the presence of senescent cells by IHC staining for p16 in post-mortem retinal donor tissue from individuals who carried a pre-
mortem diagnosis of AMD, DR/DME, or neither. We believe the resulting data support our hypothesis that the accumulation of senescent cells is linked to
AMD and DR/DME.  Quantification of IHC images indicated a significant increase in senescent cell burden (as measured by p16+ cells) in both AMD and
DR patient globes (Figure 3).  

Figure 3: Quantification of senescent cell burden in AMD and DR/DME

We  also  compared  the  presence  of  senescence  in  human  retinal  microvascular  endothelial  cells,  or  HRMEC,  versus  retinal  donor  tissue  from
human  DME/DR  patients  by  evaluating  the  gene  expression  of  several  disease-relevant  factors.  Quantitative  polymerase  chain  reaction,  or  qPCR,
demonstrated elevations in the SASP factors VEGF, PDGF, IL1B, and TNF in senescent HRMEC, relative to non-senescent cells. These disease-relevant
mediators have been reported to be elevated in DME/DR patients. We believe this data is consistent with our hypothesis that senescent cell accumulation
and SASP factors play a central role in both DME and DR.

Mechanism of Action of UBX1325 (Inhibitors of the Bcl-2 Family)

UBX1325,  our  lead  drug  candidate  (along  with  our  backup  compound  in  our  ophthalmology  program,  UBX1967)  is  a  potent  small  molecule
inhibitor of specific members of the Bcl-2 family of apoptosis regulating proteins. The B-cell lymphoma 2, or Bcl-2, gene family encodes more than 20
proteins that regulate the intrinsic apoptosis pathway and are fundamental to the balance between cell survival and cell death. Inhibition of certain Bcl-2
family  proteins  results  in  cell  death  in  certain  cell  types.  Targeting  this  pathway  has  been  studied  extensively  in  connection  with  the  search  for  new
oncology medicines.  

12

 
 
In Vitro and In Vivo Pharmacology Studies with UBX1325

We conducted an in vitro assessment of binding and efficacy of UBX1325 to determine both its potency for the Bcl-2 family protein targets and
its  potency  at  eliminating  senescent  cells.  Biochemical  assays  for  Bcl-2,  Bcl-xL,  and  Bcl-w  yielded  binding  affinities  in  the  sub-nanomolar  range.
UBX1325 is a phosphate pro-drug that releases the active parent molecule known as UBX0601. In order to assess the activity of UBX0601 on senescent
cells, we used a cell-based assay with radiation-induced senescence. Senescent cells were exposed to increasing concentrations of UBX0601 for 72 hours.
In this study, UBX0601 showed potent, concentration-dependent senolytic activity against human foetal lung cells, or IMR90, primary human umbilical
vein  endothelial  cells,  or  HUVEC,  and  HRMEC  as  measured  by  reduction  of  senescent  cell  survival.  UBX0601  also  demonstrated  selectivity  for
elimination of senescent HRMEC over non-senescent HRMEC which is observed as decreased potency in the non-senescent HRMEC (Figure 4).

Figure 4: Concentration- dependent induction of apoptosis in HRMEC cells by UBX0601 in vitro

We next studied the effects of UBX1325 in the retina in an in vivo model. We employed the mouse oxygen-induced retinopathy, or OIR, model,
which  provides  an  in  vivo  model  of  retinopathy  of  prematurity,  or  ROP,  and  DR.  In  this  model,  UBX1325  demonstrated  a  statistically  significant
improvement in the degree of retinal neovascularization (Figure 5).

Figure 5: Intravitreal injection of UBX1325 reduced retinal neovascularization in the mouse OIR model

Based  on  these  results  in  this  key  OIR  model,  we  believe  a  single  ocular  injection  of  UBX1325  has  the  potential  to  functionally  inhibit
neovascularization  and  promote  vascular  repair.  We  believe  the  efficacy  of  UBX1325  in  this  OIR  model  is  due  to  elimination  of  senescent  cells  and
accompanying SASP that propagates senescence in retinal cells and promotes neovascularization of retinal vessels.

13

 
 
We  then  studied  the  in  vivo  efficacy  of  UBX1325  in  a  streptozotocin-induced  diabetic  mouse,  or  STZ,  model  to  understand  its  effects  in  a
diabetic retina, which shows phenotypes similar to the human diseased condition. In this STZ model, UBX1325 demonstrated a significant reduction in
vascular leakage as measured by Evans Blue dye permeation (Figure 6A). UBX1325 also demonstrated an improvement in the electroretinogram, or ERG,
as a measure of retinal/photoreceptor function (Figure 6B). At a dose of 200 pmol delivered per eye, UBX1325 led to significant increase in the amplitude
of both the A- and B-waves (p<0.01 and p<0.0001, respectively) of the ERG when compared to the vehicle control group.  Lastly, the expression of several
disease-relevant cytokines was elevated in the diabetic retina, but attenuation of those factors was not observed after administration of UBX1325.

Figure 6:  Streptozotocin-induced diabetic mice have increased retinal vascular leakage (6A) and decreased A-wave amplitude in ERG (6B).  Administration of UBX1325
attenuated each of these disease-relevant endpoints.

Non-clinical toxicology studies of UBX1325, as well as its manufacturing and associated testing, have been completed to support the evaluation

of the safety, tolerability, and pharmacokinetics of this molecule in further clinical studies.  

UBX1325 Clinical Data and Development Plan

In July 2020, we filed an Investigational New Drug application, or IND, to commence a Phase 1 study of UBX1325 in patients with DME or
AMD. In October 2020, we dosed our first patient in a Phase 1 clinical study of UBX1325 to evaluate ocular and systemic safety and tolerability of a single
intravitreal  injection  of  UBX1325  by  the  incidence  of  dose  limiting  toxicities  and  treatment  emergent  adverse  events  reported  up  to  24  weeks  after
administration. Based on prospectively determined safety criteria, the Phase 1 study was able to dose-escalate beyond the originally planned 5 mcg dose up
to 10 mcg, which informed the final dose for the Phase 2a study in DME. In July 2021, we announced positive data from this Phase 1 study of UBX1325 in
patients with DME and nAMD for whom anti-VEGF therapy was no longer considered beneficial. On October 5, 2021 we announced 12-week data, on
November 9, 2021 we announced 24-week data, and on February 14, 2022 we announced 24-week data from an additionally-enrolled cohort of patients
with AMD. UBX1325 was well-tolerated with no signs of intraocular inflammation or other related ocular adversities, and no dose-limiting toxicities or
adversities  that  preclude  advancing  UBX1325  into  later  stage  clinical  development.  In  DME,  following  a  rapid  improvement  in  BCVA,  a  mean
improvement of 9.5 ETDRS letters from baseline at 6 months in the higher dose cohorts (5, 10 mcg) and 6.9 ETDRS letters from baseline at 6 months in all
dose cohorts was observed. In AMD, following a rapid improvement in BCVA, there were improvements or stabilization of both BCVA and CST through 6
months post-injection. In both diseases, the majority of patients treated with UBX1325 showed durable improvement in vision and did not meet objective
rescue criteria requiring standard of care anti-VEGF treatment. Among patients who received anti-VEGF rescue, there was minimal change in either mean
BCVA or CST following treatment in all but one patient.

In May 2021, we initiated our Phase 2a proof-of-concept study to evaluate the safety, efficacy, and durability of a single intravitreal injection of
UBX1325 in a broader population of patients with DME and dosed our first patient in June 2021. Approximately 62 patients will be enrolled, randomized
evenly between UBX1325 and sham-injected patients. An analysis of 12-week safety and efficacy data is expected by mid-2022, and patients will

14

 
 
continue to be followed through 48 weeks post-treatment in a long-term follow-up. Endpoints being explored in the study include safety and tolerability,
changes in BCVA, CST, SRF/IRF, proportion of patients requiring rescue treatment, and durability of effects.

In  March  2022,  we  also  enrolled  our  first  patient  in  our  Phase  2  proof-of-concept  study  in  nAMD.  This  study  is  expected  to  randomize  46
patients with wet AMD who have had at least three intravitreal injections of anti-VEGF therapy in the preceding six months and who have residual sub- or
intra-retinal fluid. Patients will have received their last anti-VEGF treatment approximately 4-8 weeks prior to screening, and all patients will be followed
for approximately 24 weeks after dosing with either UBX1325 or aflibercept. We expect to share 16-week data from this Ph2 study in wet AMD in the
fourth quarter of 2022.

As part of our continued commitment to our ophthalmology indications, we also continue to design alternative senolytic molecules with differing
mechanisms of action. We are also focused on the physiochemical properties of our small molecules and are developing approaches to optimize solubility,
permeability, and pharmacokinetic, or PK, parameters to create favorable ocular absorption, distribution, metabolism, and residency profiles.  

Ophthalmology Program Targeting Tie2 Signaling

The  angiopoietin-Tie2  signaling  axis  is  believed  to  play  a  fundamental  role  in  vascular  biology.  Dysregulation  of  the  expression  of  Tie2-
regulating ligands angiopoietin-2 (a context dependent Tie2 antagonist ligand) and angiopoietin-1 (a Tie2 agonist ligand) has been observed in the vitreous
of patients with DME, AMD, and other ocular diseases. We believe that a highly specific and potent Tie2-activating antibody will restore Tie2 signaling in
ocular  tissues,  potentially  leading  to  decreased  vascular  leak,  lower  levels  of  pathogenic  angiogenesis,  and  a  restoration  of  healthy  blood  vessels  in
ischemic areas of the eye. UBX2050 is an investigational Tie2-specific agonist monoclonal antibody that was selected based on its optimal binding and
functional  properties  observed  in  in  vitro  assays.  In  primary  human  endothelial  cells  (HUVECs),  UBX2050  treatment  activated  Tie2  as  measured  by
increased levels of cellular phospho-Tie2, and potently activated downstream signal transduction pathways as measured by increased levels of phospho-Akt
and phospho-Erk1/2 by western blotting (Figure 7).

Figure 7. Anti-Tie2 agonist antibody Tie2-3 (UBX2050) activated Tie2 signaling with a potency comparable to angiopoietin-1 in primary endothelial cells in

vitro.

15

 
The in vivo activity of UBX2050 has been explored in a laser-induced choroidal neovascularization model in mice. In this model, UBX2050
was  administered  to  mice  via  the  intraperitoneal  route  at  a  dose  of  10  mg/kg,  one  day  prior  to  laser-induced  rupture  of  Bruch’s  membrane.  UBX2050
treatment, but not treatment with a non-specific isotype control antibody, significantly inhibited the area of choroidal neovascularization nine days post-
injury  as  measured  in  retina/choroid  flat  mounts  from  treated  animals  (Figure  8). Based on this data, we believe UBX2050 has the potential to address
pathogenic angiogenesis in the eyes of patients with ocular diseases such as AMD and DME.

Figure 8. UBX2050 treatment significantly inhibited choroidal neovascularization in a laser-induced injury model in mice.

We  believe  that  the  investigational  Tie2  antibody  (UBX2050)  may  be  an  orthogonal  approach  to  restoring  barrier  function  and  vascular

function. We are exploring a number of indications for UBX2050 and expect to nominate a Development Candidate in 2022.

Tie2/VEGF bispecific program

Tie2  is  a  receptor  tyrosine  kinase  that  is  implicated  in  regulating  barrier  function  in  blood  vessels  of  the  eye,  which  are  affected  in  several
prevalent eye diseases. Tie2 is an important key regulator of the vascular endothelium in the eye and dysregulation of this pathway leads to loss of barrier
integrity  and  healthy  vasculature.  Preliminary  studies  suggest  that  cellular  senescence  in  aging  eyes  may  induce  Ang-2  and  therefore  deactivate  Tie2,
leading ocular edema. The Tie2/VEGF bispecific has dual functionality on two validated targets for retinal diseases. In addition to direct activation of Tie2,
the bispecific candidate is designed to neutralize VEGF-A and VEGF-B. We believe that direct agonism of Tie2 may be superior to antagonism of Ang2
which  relies  on  adequate  levels  of  endogenous  Ang1  to  activate  the  Tie2  pathway.  We  have  identified  Tie2/VEGF  bispecific  molecules  that  have
pharmacological activity on Tie2 and VEGF with potencies relevant for clinical benefit. Based on supporting preclinical data, we expect to designate an
Advanced Candidate by mid-2022. We also seek to initiate pilot preclinical toxicology experiments to support nomination of a Development Candidate that
should enable initiation of IND-enabling studies in the second half of 2023.

Neurology Program

We  believe  cellular  senescence  may  play  a  fundamental  role  in  neurodegeneration.  Multiple  lines  of  evidence  suggest  that  senescent  cells
accumulate in the nervous system during normal aging and neurodegenerative disease. While the brain is composed of a diversity of post-mitotic (e.g.,
neurons) and proliferative (e.g., astrocytes, microglia, oligodendrocytes, endothelial cells, pericytes, neural progenitor cells, etc.) cells, glia appear to be
uniquely prone to enter a senescent state. Interestingly, neurons do not readily express canonical markers of

16

 
 
 
 
senescence, perhaps due to their terminally differentiated state. In the human cortex, a significant increase in p16 positive astrocytes has been observed in
advanced  age  (78-90  years)  relative  to  middle  age  (35-50  years)  individuals.  Cellular  senescence  has  also  been  shown  to  be  a  hallmark  of  multiple
neurodegenerative diseases. The appearance of senescent cells precedes the formation of neurofibrillary tangles and phosphorylated tau in the cortex of
both human Alzheimer’s Disease and the mouse P301S MAPT tauopathy/FTD model, suggesting that cellular senescence may be an early driver of disease
pathophysiology. In Parkinson’s Disease, elevated levels of p16 and several SASP factors have been detected in the human substantia nigra pars compacta,
providing further evidence that astrocytes are prone to a senescent phenotype. Senescent astrocytes expressing elevated levels of p16, p21, and IL6 have
also been detected in the human Amyotrophic Lateral Sclerosis brain and spinal cord.

Several preclinical third-party proof of concept studies in mouse models of aging and neurodegeneration have provided preliminary evidence
that  the  removal  of  senescent  cells  via  senolytic  drugs  or  genetic  methods  can  improve  brain  function.  These  early  proof  of  concept  studies  provide
encouraging evidence that senolysis can ameliorate the pathophysiology associated with neurodegeneration.

UBX2089, a α-Klotho hormone drug candidate, is a circulating hormone primarily produced in the kidneys and choroid plexus of the brain,
which is being researched for multiple neurology indications. Human genetic evidence links α-Klotho to cognitive function, and we have observed pro-
cognitive activity of recombinant α-Klotho in multiple preclinical rodent and non-human primate models. Our work focused on investigating the effect of
UBX2089 on engaging CNS circuits in preclinical animal models with the intent of advancement to clinical studies, and in December 2021, we announced
an exclusive licensing agreement of our α-Klotho asset to Jocasta Neuroscience, Inc. for development and commercialization

Manufacturing

Our  success  will  depend  on  our  ability  to  deliver  reliable,  high-quality  preclinical  and  clinical  drug  supply.  As  we  mature  and  approach
commercial stage operations, securing reliable high-quality commercial drug supply will be critical. We contract with third parties for the manufacture of
our  drug  candidates  for  clinical  studies.  Because  we  rely  on  contract  manufacturers,  we  employ  personnel  with  extensive  technical,  manufacturing,
analytical,  and  quality  experience.  Our  staff  has  strong  project  management  discipline  to  oversee  contract  manufacturing  and  testing  activities,  and  to
compile manufacturing and quality information for our regulatory submissions.

Manufacturing  is  subject  to  extensive  regulation  that  imposes  various  procedural  and  documentation  requirements  and  that  governs  record
keeping, manufacturing processes and controls, personnel, quality control and quality assurance, and more. Our systems and our contractors are required to
be in compliance with these regulations, and compliance is assessed regularly through monitoring of performance and a formal audit program.

Our current supply chains for our lead drug candidates involve several manufacturers that specialize in specific operations of the manufacturing
process, specifically, raw materials manufacturing, drug substance manufacturing, drug product manufacturing, and drug product labeling, packaging, and
storage. We currently operate under purchase order programs for our drug candidates with Material Service Agreements in place, and we intend to establish
long-term  supply  agreements  in  the  future.  We  believe  our  current  manufacturers  have  the  scale,  the  systems,  and  the  experience  to  supply  all  planned
clinical studies.

We do not currently require commercial manufacturing capabilities. Should our needs change, we will likely need to scale up our manufacturing
processes to enable commercial launch. To ensure continuity in our supply chain, we plan to establish supply arrangements with alternative larger scale
suppliers for certain portions of our supply chain, as appropriate.

We do not currently have, nor do we expect to have in the near term, any FDA-approved drugs in our portfolio. Therefore, we have not yet built

an infrastructure for sales, marketing, or commercial distribution.

Commercialization Plan

17

 
 
 
Should  any  of  our  drug  candidates  move  into  pivotal  clinical  trials  intended  to  support  an  application  for  market  authorization,  we  intend  to

develop a plan to commercialize them in the United States and other key markets, through an internal infrastructure or external partnerships.

Competition

The  biotechnology  and  pharmaceutical  industries,  including  the  field  of  research  in  aging,  are  typically  rife  with  rapid  technological
developments, bold competition, and dependence on intellectual property. Like any biotechnology company, we face competition from multiple sources,
including large or established pharmaceutical, biotechnology, and wellness companies, academic research institutions, government agencies, and private
institutions.  We  believe  our  drug  candidates  will  prevail  amid  the  competitive  landscape  through  their  efficacy,  safety,  administration  methods  and
convenience, cost, public and institutional demand, intellectual property portfolio, and treatment of the root cause of many diseases of aging.

We  are  aware  of  other  companies  seeking  to  develop  treatments  to  prevent  or  treat  diseases  of  aging  through  various  biological  pathways,
including several large pharmaceutical companies that have exploratory programs as well as a number of earlier-stage companies. Most of these companies
are either in early stages of discovery research in senescence or have not yet disclosed pipeline candidates or mechanisms of interest, and those companies
that  have  disclosed  pipeline  candidates  are  targeting  other  pathways.  Hence,  we  believe  that  we  currently  have  the  most  advanced  program  addressing
cellular senescence.

Our drug candidates are likely to compete against current therapies from a wide range of companies and technologies, including therapies for
ophthalmology  diseases:  current  standard  of  care  treatments  include  anti-VEGF  antibodies  (bevacizumab,  ranibizumab,  aflibercept,  brolucizumab);
VEGF/Ang2 bispecific antibodies (faricimab); intravitreal steroid (dexamethasone); and pan-retinal photocoagulation by laser for both neovascular AMD,
DR, and DME. There is no currently available treatment for geographic atrophy form of AMD. There are potentially disease-modifying therapeutics are
being developed by several pharmaceutical and biotechnology companies, including Roche/Genentech and Regeneron.

Many of our competitors, either alone or with strategic partners, have substantially greater financial, technical, and human resources than we
do. Accordingly, our competitors may be more successful in obtaining approval for treatments and achieving widespread market acceptance, rendering our
treatments obsolete or non-competitive. Accelerated merger and acquisition activity in the biotechnology and biopharmaceutical industries may result in
even more resources concentrated among a smaller number of our competitors. These companies also compete with us in recruiting and retaining qualified
scientific and management personnel, establishing clinical study sites, patient registration for clinical studies, and acquiring technologies complementary
to,  or  necessary  for,  our  programs.  Smaller  or  early-stage  companies  may  also  prove  to  be  significant  competitors,  particularly  through  collaborative
arrangements with large and established companies. Our commercial opportunity could be substantially limited in the event that our competitors develop
and commercialize products that are more effective, safer, more tolerable, more convenient, or less expensive than our comparable products. In geographies
that  are  critical  to  our  commercial  success,  competitors  may  also  obtain  regulatory  approvals  before  us,  resulting  in  our  competitors  building  a  strong
market  position  in  advance  of  our  products’  entry.  We  believe  the  factors  determining  the  success  of  our  programs  will  be  the  efficacy,  safety,  and
convenience of our drug candidates.

Intellectual Property

Our success depends in large part upon our ability to obtain and maintain proprietary protection for our products and technologies and to operate
without infringing the proprietary rights of others. Our policy is to protect our proprietary position by, among other methods, filing U.S. and foreign patent
applications  that  relate  to  our  proprietary  technologies,  inventions  and  improvements  that  are  important  to  the  development  and  implementation  of  our
business. We also rely on trademarks, know-how, continuing technological innovation and licensing opportunities to develop and maintain our proprietary
position.

18

 
Patent Portfolio

Our patent portfolio consists of a combination of issued and allowed patents and pending patent applications that are owned or co-owned by us
and/or licensed to us from third parties. The majority of these patents and applications cover our cellular senescence program, and others pertain to our
programs that target aging mechanisms beyond cellular senescence, including the administration of a Tie2 receptor agonist or α-Klotho hormone. As of
March 1, 2022, we own, co-own, or have an exclusive license in certain fields of use to more than 150 patents and pending applications in the United States
and  foreign  jurisdictions.  This  portfolio  includes  47  issued  and  allowed  U.S.  patents  and  applications  and  38  granted  and  allowed  foreign  patents  and
applications, respectively.

In general, patents have a term of 20 years from the earliest claimed non-provisional priority date. The patent term may be extendible by up to
five years in certain countries by means of patent term extension depending on the regulatory pathway and the remaining term upon marketing approval.
Certain  other  patents  and  patent  applications  directed  to  our  patent  portfolio,  if  they  were  to  issue,  may  have  later  expiration  dates.  Any  pending  U.S.
provisional application is not eligible to become an issued patent until, among other things, we file a non-provisional patent application within 12 months
of  filing  the  related  provisional  patent  application.    If  we  do  not  timely  file  any  non-provisional  patent  application,  we  may  lose  our  priority  date  with
respect to our provisional patent application and any patent protection on the inventions disclosed in our provisional patent application.

Ophthalmology Programs

We  have  a  license  with  Ascentage  to  two  patent  families  of  issued  and  pending  composition  of  matter  patents  directed  to  specific  Bcl-xL
inhibitors  including  UBX0601,  the  active  parent  molecule  of  our  lead  drug  candidate,  UBX1325.  This  license  grants  us  exclusive  development  and
commercialization  rights  and  non-exclusive  manufacturing  rights  to  UBX1325  for  all  non-oncology  indications  outside  of  Greater  China  (China,  Hong
Kong, Macau and Taiwan). Inside Greater China, we will be obligated to develop, manufacture and commercialize UBX1325 through a joint venture with
Ascentage. Patents in these two patent families have been granted in the United States, South Korea, New Zealand, South Africa, Australia, Canada, India,
Singapore,  Japan  and  Europe,  and  others  are  pending  in  China,  India,  and  Singapore.  Patents  that  issue  from  these  two  patent  families  are  expected  to
expire in 2032 and 2034, excluding any patent term adjustments or extensions.

Our  license  agreement  with  Ascentage  also  grants  us  the  right  to  continue  our  preclinical  development  efforts  with  UBX1967  (our  back-up
compound to UBX1325) until the time we wish to submit an IND for UBX1967, at which point we would be required to either enter into a separate license
agreement with Ascentage covering UBX1967.  

We co-own a patent family encompassing the use of Bcl-2 and Bcl-xL inhibitors generally to treat various age-related eye diseases by targeting
senescent cells (which also covers aspects of our neurology programs) with the Buck Institute and the Mayo Clinic. We have exclusive licenses from each
of the Buck Institute and the Mayo Clinic to this patent family in the field of senescence. To date, three U.S. patents have issued in this patent family which
are directed to treating age related eye diseases, including age-related macular degeneration. Other patent applications are pending in the United States,
Australia,  Canada,  China,  Europe,  Mexico,  and  Japan.  Patents  that  issue  from  this  family  are  expected  to  expire  in  2035,  excluding  any  patent  term
adjustments and patent term extensions.

We also solely own a patent family that specifically claims the composition of matter of UBX1325 and closely related compounds, as well as
general  methods  of  use  of  UBX1325.  As  of  March  1,  2022  we  have  two  issued  U.S.  patents  and  one  pending  U.S.  application  as  well  as  pending
applications in Australia, Canada, China, Europe, Japan, Hong Kong, and South Korea. Future patents issued from this family are expected to expire in
2039, excluding any patent term adjustments and patent term extensions.

We solely own a patent family that specifically covers the sequence, epitope, alternative antibody formats, and use of UBX2050 not only for
ophthalmic diseases, but also other indications, including kidney. Future patents issuing from this family are expected to expire in 2040, excluding any
patent term adjustments and patent term extensions.

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Neurology Program

We have an exclusive license with The Regents of the University of California for a patent family directed to methods of treatment and the use of
α-Klotho hormone for the development of human therapeutics to treat cognitive decline. As of March 1, 2022, our patent portfolio includes three issued
U.S. patents, an issued patent in Australia, Europe, and Japan, one pending patent application in each of the United States, Australia, Canada, Europe, Hong
Kong, and India and two pending patent applications in China. Patents that issue from this family are expected to expire in 2036, excluding any patent term
adjustments and patent term extensions. In December 2021, we announced an exclusive agreement licensing our α-Klotho asset to Jocasta Neuroscience,
Inc. for development and commercialization.

We co-own a patent family encompassing the use of Bcl-2/xL inhibitors generally to treat neurodegenerative diseases by targeting senescent cells
(which also covers aspects of our ophthalmology program) with the Buck Institute and the Mayo Clinic. We have exclusive licenses from each of the Buck
Institute and the Mayo Clinic to this patent family in the field of senescence. Currently, we co-own a pending U.S. patent application for the use of Bcl-xL
inhibition to eliminate senescent cells to treat neurodegenerative disorders. Patents that issue from this family are expected to expire in 2035, excluding any
patent term adjustments and patent term extensions.

Other Intellectual Property

Our continuing research and development, technical know-how, and contractual arrangements supplement our intellectual property protection to
maintain our competitive position. Our policy is to require inventors who are identified on any Company-owned patent applications to assign rights to us.
We also have confidentiality agreements with our employees, consultants, and other advisors to protect our proprietary information. Our policy is to require
third parties that receive material UNITY confidential information to enter into confidentiality agreements with us.

We  also  protect  our  brand  through  procurement  of  trademark  rights.  As  of  March  1,  2022,  the  mark  UNITY  BIOTECHNOLOGY®  and  the
UNITY BIOTECHNOLOGY® design logo are registered in the United States, the European Union, or EU, China, and in Japan, as well as other foreign
jurisdictions.  The  mark  UNITY®  is  also  registered  in  the  United  States  and  in  the  EU.  In  order  to  supplement  protection  of  our  brand,  we  have  also
registered several internet domain names.

Description of Ascentage Agreements

Licenses and Collaborations

In  February  2016,  we  entered  into  several  related  agreements  with  Ascentage  Pharma  Group  Corp.  Limited,  or  Ascentage,  which  is
headquartered in Suzhou, China and listed on the Hong Kong Stock Exchange. These agreements include a compound library and option agreement, which
includes a template form of license agreement and in January 2019 we entered into a license agreement granting us development and commercialization
rights to UBX1967 and the right to continue preclinical development efforts with UBX1325, which is a phosphate pro-drug that releases the active parent
molecule known as UBX0601, or the Original Bcl Agreement. This Original Bcl Agreement was amended in the fourth quarter of 2019 to remove certain
field and territory limitations and to amend the schedule of licensed patents related to UBX1967, and then amended again in the first quarter of 2020 to
further amend and restate the schedule of licensed patents. This Original Bcl Agreement was amended a third time in June 2020 to switch the status of
UBX1967 from Licensed Compound to back-up compound, and conversely the status of UBX1325 from back-up to Licensed Compound.  

Library Agreement and License Template

The  compound  library  and  option  agreement,  or  library  agreement,  gives  us  access  to  Ascentage’s  existing  collection  of  Bcl-2/xL  inhibitor
compounds,  as  well  as  any  additional  Bcl-2/xL  inhibitor  compounds  developed  during  the  term  of  the  library  agreement,  in  order  to  screen  such
compounds for senolytic activity. The library

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agreement permits us to nominate up to 15 such compounds at any given time for further evaluation and subsequently to select up to five of such selected
compounds  for  preclinical  development  and  an  additional  five  as  back-up  compounds.  Prior  to  commencing  IND-enabling  toxicology  studies  on  an
Ascentage  compound  of  interest,  we  must  formally  designate  the  compound  as  a  development  candidate  under  the  library  agreement  and  enter  into  a
separate license agreement with Ascentage covering that compound on the terms set forth in the template form of license agreement. The library agreement
includes exclusivity provisions that (i) prohibit us from developing Ascentage Bcl-2/xL compounds for oncology indications, (ii) prohibit Ascentage from
researching  or  developing  certain  Bcl-2/xL  compounds  for  non-oncology  indications  under  any  circumstances,  and  (iii)  prohibit  Ascentage  from
researching or developing certain other Bcl-2/xL compounds for a specified set of non-oncology indications under certain circumstances. The term of the
library agreement is determined by a formula that is linked to the term of the research services agreement, and expired in February 2022.

Under the terms of the template form of license agreement, Ascentage will grant us the following rights with respect to a selected Ascentage
compound  for  all  non-oncology  indications:  (i)  exclusive  worldwide  development  rights,  and  (ii)  exclusive  commercialization  rights  outside  of  Greater
China (China, Hong Kong, Macau and Taiwan). Inside Greater China, we will be obligated to commercialize the licensed Ascentage compound through a
joint  venture  with  Ascentage.  Ascentage  will  also  have  the  right  to  manufacture  at  least  50%  of  our  supply  requirements  of  the  licensed  compound,
provided they achieve and maintain certain manufacturing quality standards. We will be obligated to make certain milestone payments in the form of shares
of  our  common  stock,  subject  to  the  equity  cap  described  below,  and  other  milestone  payments  in  in  the  form  of  cash,  not  to  exceed  $38.0  million  per
licensed product, based in each case, upon the achievement of certain clinical and commercial milestones. We will also be required to make low-single digit
royalty payments on net sales of the licensed product under the agreement. Our royalty payment obligations will expire on a country-by-country basis and
licensed product-by-licensed product basis upon the later to occur of (i) the expiration of the last valid claim of a licensed patent covering such licensed
product in such country, (ii) the expiration of regulatory exclusivity for such licensed product in such country, and (iii) the tenth anniversary of the first
commercial sale of such licensed product in any country. We have the right to credit certain royalty payments that we pay to third parties with respect to
certain licensed products against our royalty obligation to Ascentage. Any license agreement may be terminated by either party due to the other party’s
uncured material breach of the agreement.

Under  the  library  agreement,  we  issued  133,334  shares  of  our  common  stock  as  an  upfront  license  fee.  Of  such  shares,  80%  were  issued  to
Ascentage and 20% were issued to the University of Michigan in satisfaction of Ascentage’s obligation to pay a related sublicense fee to the University of
Michigan. we will also be obligated to issue 133,334 shares of our common stock as an upfront license fee to Ascentage and the University of Michigan for
each  of  the  next  two  license  agreements.  The  aggregate  number  of  shares  of  our  common  stock  we  could  be  required  to  issue  to  Ascentage  and  the
University of Michigan pursuant to the library agreement, and any additional license agreements we enter into pursuant to the library agreement is capped
at (i) 933,337 shares of common stock in the event there is only one licensed product, and (ii) 1,333,338 shares of common stock in the event there are two
or more licensed products, in each case to be issued based on our achievement of certain preclinical and clinical development and sales milestone events.

UBX1967 License Agreement

In January 2019, we entered into a license agreement, the Bcl license agreement, with Ascentage granting rights to UBX1967 (which Ascentage
calls APG1197) on the template license terms described above, including up to $38.0 million of potential cash milestone payments and low-single digit
royalties.  Under  the  terms  of  this  license  agreement,  Ascentage  has  granted  us  exclusive  development  and  commercialization  rights  and  non-exclusive
manufacturing  rights  to  UBX1967  for  all  non-oncology  indications  outside  of  Greater  China.  Inside  Greater  China,  we  will  be  obligated  to  develop,
manufacture  and  commercialize  UBX1967  through  a  joint  venture  with  Ascentage.  The  Bcl  license  agreement  also  grants  us  the  right  to  continue  our
preclinical development efforts with another Ascentage-controlled Bcl-2/xL inhibitor compound. In the event we wish to pursue clinical development of
the additional compound as well as UBX1967, we will be required to enter into a separate license agreement with Ascentage on the template license terms
described above. In connection with the Bcl license agreement, we issued 106,667 shares of common stock to Ascentage and 26,667 shares of common
stock to the University of Michigan as an upfront license fee in the first quarter of 2019. The Bcl license agreement may be terminated by either party due
to an uncured material breach of the agreement but the other party, and we may terminate for convenience on a

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licensed product-by-licensed product basis. In November 2019, we entered into an amendment to the Bcl license agreement that removed certain field and
territory limitations from a provision granting us exclusivity and amended the schedule of licensed patents to include certain additional patents relating to
UBX1967. In January 2020, we entered into a second amendment to the Bcl license agreement which further amended and restated the schedule of licensed
patents. In June 2020, we entered into a third amendment to the Bcl license agreement. Under the terms of the original Bcl license agreement, Ascentage
granted us exclusive development and commercialization rights and non-exclusive manufacturing rights to UBX1967 as well as the right to continue our
preclinical development efforts with another Ascentage-controlled Bcl  inhibitor  compound,  known  as  UBX1325, that served as a back-up compound to
UBX1967. Under the terms of the third amendment to the Bcl license agreement, the status of UBX1967 and UBX1325 were switched such that UBX1325
became the licensed compound and UBX1967 became the back-up compound under the Bcl license agreement. As a result of the first patient dosed in the
UBX1325 study in the fourth quarter of 2020, we triggered, under the Bcl license agreement, a milestone payment of $1.0 million, which we  elected  to
settle  in  shares  of  our  common  stock  to  Ascentage  Pharma.  As  a  result  of  the  first  patient  dosed  in  the  Phase  2a  UBX1325  study  in  June  2021,  the
Company  additionally  triggered  a  milestone  payment  of  $2.0  million  for  Ascentage  Pharma,  which  the  Company  elected  to  settle  in  shares  of  the
Company’s common stock.

Additional License Agreements

We  are  party  to  three  additional  license  agreements  that  support  our  senescence-related  patent  portfolio.  These  agreements  are  with  The  John
Hopkins University, or JHU, an entity affiliated with the Mayo Clinic, or Mayo, and the Buck Institute for Research on Aging, or Buck, and provide us
with a worldwide, exclusive, sublicensable license under those counter-parties’ rights to a patent family that is co-owned by JHU, Buck, Mayo and us to
develop  and  commercialize  licensed  products,  including  for  the  treatment  of  senescence-related  diseases  in  therapeutic  areas  including  osteoarthritis,
ophthalmology, and neurological diseases.

Under  our  June  2013  license  with  Mayo,  we  may  be  obligated  to  make  development  and  sales  milestone  payments  to  Mayo  of  up  to
$10.8 million in the aggregate, to pay Mayo a percentage of certain sublicensing revenue that is between the high-single digits and the low-teens, and to
pay Mayo running royalty payments ranging from less than 1% to low-single digit percentages on net sales of licensed products. Our obligation to pay
running royalties to Mayo under the agreement is subject to a non-material minimum annual royalty and could potentially extend until January 1, 2037. We
also issued 677,966 shares of our common stock to Mayo under this agreement. Our agreement with Mayo continues until the later of (i) the expiration of
the last valid claim within the licensed patents and (ii) 13 years after first commercial sale of the first licensed product. We may terminate the agreement for
convenience, and either party may terminate the agreement for the other party’s uncured material breach.

Under our January 2017 license with Buck, which includes similar rights to a second patent family that is co-owned only by Buck and us, we
may  be  obligated  to  make  development  and  sales  milestone  payments  to  Buck  of  up  to  $5.4  million  in  the  aggregate,  to  pay  Buck  a  mid-single  digit
percentage of certain sublicensing revenue, and to pay Buck running royalty payments ranging from less than 1% to low-single digit percentages on net
sales of licensed products. Our obligation to pay running royalties to Buck under the agreement is subject to a non-material minimum annual royalty and
could potentially extend until January 1, 2037. We also issued 132,203 shares of our common stock to Buck under this agreement. The term of our license
agreement with Buck continues until the expiration of all our payment obligations to Buck thereunder. We may terminate the agreement for convenience,
and either party may terminate the agreement for the other party’s uncured material breach.

Under our November 2016 license with JHU, which relates to patents that are relevant only to osteoarthritis indications, we may be obligated to
make development and sales milestone payments to JHU in the form of equity (22,033 shares of our common stock) and cash (of up to $2.6 million in the
aggregate), to pay JHU a low-single digit percentage of certain sublicensing revenue, and to pay JHU a running royalty payment of less than 1% on net
sales, in all cases, with respect to licensed products for the treatment of osteoarthritis, which we refer to as Royalty Products. Our obligation to pay running
royalties to JHU under the agreement is subject to a non-material minimum annual royalty, and may continue on a country-by-country basis until such time
as neither the manufacture, sale, nor use of such Royalty Product would infringe a valid claim of a licensed patent in the applicable country. Our agreement
with JHU continues on a country-by-country basis until the expiration of the last to expire licensed patent in such country (or until twenty years after the
effective date if no licensed patent issues in such country). We may

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terminate the agreement for convenience (as a whole, with respect to a licensed product, or with respect to a particular licensed patent). Either party may
terminate the agreement for the other party’s uncured material breach or bankruptcy or insolvency-related events.

We are also party to license agreements relating to our α-Klotho program. In May 2019, we entered into an exclusive license with The Regents of
the University of California for intellectual property and know-how for the development of human therapeutics to treat cognitive decline in exchange for
development and sales milestones and low single-digit percentages on net sales of licensed products. In December 2021, we signed an exclusive license
agreement licensing our rights in the α-Klotho asset to Jocasta Neuroscience, Inc. for development and commercialization, under which we received a $5
million upfront cash payment from Jocasta, and we will also receive additional payments based on development milestones, approval milestones, and sales-
based royalties, per indication.

Government Regulation

Government authorities in the United States (including federal, state and local authorities) and in other countries, extensively regulate, among
other things, the manufacturing, research and clinical development, marketing, labeling and packaging, storage, distribution, post-approval monitoring and
reporting, advertising and promotion, pricing, and export and import of pharmaceutical products, such as those we are developing. The process of obtaining
regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of
substantial time and financial resources.

U.S. Government Regulation

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and its implementing regulations, and
biologics  under  the  FDCA  and  the  Public  Health  Service  Act,  or  PHSA,  and  its  implementing  regulations.  FDA  approval  is  required  before  any  new
unapproved drug or dosage form, including a new use of a previously approved drug, can be marketed in the United States. Drugs and biologics are also
subject to other federal, state and local statutes and regulations. If we fail to comply with applicable FDA or other requirements at any time during the drug
development  process,  clinical  testing,  the  approval  process  or  after  approval,  we  may  become  subject  to  administrative  or  judicial  sanctions.  These
sanctions could include the FDA’s refusal to approve pending applications, license suspension or revocation, withdrawal of an approval, warning letters,
product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, civil penalties or criminal prosecution.

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

completion of extensive preclinical laboratory tests and preclinical animal studies, all performed in accordance with GLP regulations;

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

approval by an independent institutional review board, or IRB, or ethics committee representing each clinical site before each clinical study may
be initiated;

performance of adequate and well-controlled human clinical studies to establish the safety and efficacy, or in the case of a biologic, the safety,
purity and potency, of the drug candidate for each proposed indication;

preparation of and submission to the FDA of a new drug application, or NDA, or biologics license application, or BLA, after completion of all
pivotal clinical studies;

review of the product application by an FDA advisory committee, where appropriate and if applicable;

a determination by the FDA within 60 days of its receipt of an NDA or BLA to file the application for review;  

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satisfactory  completion  of  an  FDA  pre-approval  inspection  of  the  manufacturing  facilities  where  the  drug  candidate  is  produced  to  assess
compliance with current Good Manufacturing Practices, or cGMP; and

FDA review and approval of an NDA or BLA prior to any commercial marketing or sale of the drug or biologic in the United States.

An IND is a request for authorization from the FDA to administer an investigational new drug product to humans. The central focus of an IND
submission  is  on  the  general  investigational  plan  and  the  protocol(s)  for  human  studies.  The  IND  also  includes  results  of  animal  and  in  vitro  studies
assessing  the  toxicology,  pharmacokinetics,  pharmacology  and  pharmacodynamic  characteristics  of  the  product;  chemistry,  manufacturing  and  controls
information; and any available human data or literature to support the use of the investigational new drug. An IND must become effective before human
clinical studies may begin. An IND will automatically become effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns
or questions related to the proposed clinical studies. In such a case, the IND may be placed on clinical hold and the IND sponsor and the FDA must resolve
any outstanding concerns or questions before clinical studies can begin. Accordingly, submission of an IND may or may not result in the FDA allowing
clinical studies to commence.

Clinical Studies

Clinical studies involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in
accordance with Good Clinical Practice regulations, or GCPs, which include the requirement that all research subjects provide their informed consent for
their  participation  in  any  clinical  study.  Clinical  studies  are  conducted  under  protocols  detailing,  among  other  things,  the  objectives  of  the  study,  the
parameters  to  be  used  in  monitoring  safety  and  the  efficacy  criteria  to  be  evaluated.  A  protocol  for  each  clinical  study  and  any  subsequent  protocol
amendments must be submitted to the FDA as part of the IND. Additionally, approval must also be obtained from each clinical study site’s IRB before the
studies  may  be  initiated,  and  the  IRB  must  monitor  the  study  until  completed.  There  are  also  requirements  governing  the  reporting  of  ongoing  clinical
studies and clinical study results to public registries.

The  clinical  investigation  of  a  drug  or  biologic  is  generally  divided  into  three  or  four  phases.  Although  the  phases  are  usually  conducted

sequentially, they may overlap or be combined.

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Phase 1.The drug or biologic is initially introduced into healthy human subjects or patients with the target disease or condition. These studies are
designed  to  evaluate  the  safety,  dosage  tolerance,  metabolism  and  pharmacologic  actions  of  the  investigational  new  drug  in  humans,  the  side
effects associated with increasing doses, and if possible, to gain early evidence on effectiveness.

Phase 2.The drug or biologic is administered to a limited patient population to evaluate dosage tolerance and optimal dosage, identify possible
adverse side effects and safety risks and preliminarily evaluate efficacy.

Phase 3.The  drug  or  biologic  is  administered  to  an  expanded  patient  population,  generally  at  geographically  dispersed  clinical  study  sites  to
generate  enough  data  to  statistically  evaluate  dosage,  clinical  effectiveness  and  safety,  to  establish  the  overall  benefit-risk  relationship  of  the
investigational product and to provide an adequate basis for product approval.

Phase  4.In  some  cases,  the  FDA  may  condition  approval  of  an  NDA  or  BLA  for  a  drug  candidate  on  the  sponsor’s  agreement  to  conduct
additional clinical studies after approval. In other cases, a sponsor may voluntarily conduct additional clinical studies after approval to gain more
information about the drug. Such post-approval studies are typically referred to as Phase 4 clinical studies.

A pivotal study is a clinical study that adequately meets regulatory agency requirements for the evaluation of a drug candidate’s efficacy and
safety such that it can be used to justify the approval of the product. Generally, pivotal studies are Phase 3 studies, but the FDA may accept results from
Phase 2 studies if the study design provides a well-controlled and reliable assessment of clinical benefit, particularly in situations where there is an unmet
medical need and the results are sufficiently robust.

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The FDA, the IRB or the clinical study sponsor may suspend or terminate a clinical study at any time on various grounds, including a finding that
the  research  subjects  are  being  exposed  to  an  unacceptable  health  risk.  Additionally,  some  clinical  studies  are  overseen  by  an  independent  group  of
qualified experts organized by the clinical study sponsor, known as a data safety monitoring board or committee. This group provides authorization for
whether  or  not  a  study  may  move  forward  at  designated  check  points  based  on  access  to  certain  data  from  the  study.  A sponsor  may  also  suspend  or
terminate a clinical study based on evolving business objectives and/or competitive climate.

Submission of an NDA or BLA to the FDA

Assuming successful completion of all required testing in accordance with all applicable regulatory requirements, detailed investigational new
drug product information is submitted to the FDA in the form of an NDA or BLA requesting approval to market the product for one or more indications.
Under  federal  law,  the  submission  of  most  NDAs  and  BLAs  is  subject  to  a  substantial  application  user  fee.  Applications  for  orphan  drug  products  are
exempted from the NDA and BLA application user fees.

An NDA or BLA must include all relevant data available from pertinent preclinical and clinical studies, including negative or ambiguous results
as well as positive findings, together with detailed information relating to the product’s chemistry, manufacturing, controls and proposed labeling, among
other things. Data can come from company-sponsored clinical studies intended to test the safety and effectiveness of a use of a product, or from a number
of  alternative  sources,  including  studies  initiated  by  investigators.  To  support  marketing  approval,  the  data  submitted  must  be  sufficient  in  quality  and
quantity to establish the safety and effectiveness of the investigational product to the satisfaction of the FDA.

Once  an  NDA  or  BLA  has  been  submitted,  the  FDA’s  goal  is  to  review  the  application  within  ten  months  after  it  accepts  the  application  for
filing, or, if the application receives priority review, six months after the FDA accepts the application for filing. The review process is often significantly
extended by FDA requests for additional information or clarification.

Before approving an NDA or BLA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not
approve  an  application  unless  it  determines  that  the  manufacturing  processes  and  facilities  are  in  compliance  with  cGMP  requirements  and  adequate  to
assure consistent production of the product within required specifications. Additionally, before approving an NDA or BLA, the FDA will typically inspect
one or more clinical sites to assure compliance with GCP.

The FDA is required to refer an application for a novel drug or biologic to an advisory committee or explain why such referral was not made. An
advisory  committee  is  a  panel  of  independent  experts,  including  clinicians  and  other  scientific  experts,  that  reviews,  evaluates  and  provides  a
recommendation  as  to  whether  the  application  should  be  approved  and  under  what  conditions.  The  FDA  is  not  bound  by  the  recommendations  of  an
advisory committee, but it considers such recommendations carefully when making decisions and typically follows such recommendations.

The FDA’s Decision on an NDA or BLA

After the FDA evaluates the NDA or BLA and conducts inspections of manufacturing facilities, it may issue an approval letter or a Complete
Response Letter. An approval letter authorizes commercial marketing of the drug or biologic with specific prescribing information for specific indications.
A  Complete  Response  Letter  indicates  that  the  review  cycle  of  the  application  is  complete  and  the  application  is  not  ready  for  approval.  A  Complete
Response Letter may require additional clinical data and/or an additional pivotal Phase 3 clinical study(ies), and/or other significant, expensive and time-
consuming requirements related to clinical studies, preclinical studies or manufacturing. Even if such additional information is submitted, the FDA may
ultimately decide that the NDA or BLA does not satisfy the criteria for approval. The FDA could also approve the NDA or BLA with a Risk Evaluation
and Mitigation Strategy, or REMS, 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

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other  risk  minimization  tools.  The  FDA  also  may  condition  approval  on,  among  other  things,  changes  to  proposed  labeling,  development  of  adequate
controls and specifications or a commitment to conduct one or more post-market studies or clinical studies. Such post-market testing may include Phase 4
clinical  studies  and  surveillance  to  further  assess  and  monitor  the  product’s  safety  and  effectiveness  after  commercialization.  Also,  new  government
requirements,  including  those  resulting  from  new  legislation,  may  be  established,  or  the  FDA’s  policies  may  change,  which  could  delay  or  prevent
regulatory approval of our products under development.

Expedited Review and Accelerated Approval Programs

The FDA has various programs, including fast track designation, breakthrough therapy designation, accelerated approval, and priority review,
that are intended to expedite the development and approval of new drugs and biologics that address unmet medical needs in the treatment of serious or life-
threatening diseases and conditions. To be eligible for a fast track designation, the FDA must determine, based on the request of a sponsor, that a product is
intended to treat a serious or life-threatening disease or condition and demonstrates the potential to address an unmet medical need. The FDA may review
sections  of  the  NDA  for  a  fast-track  product  on  a  rolling  basis  before  the  complete  application  is  submitted,  if  the  sponsor  provides  a  schedule  for  the
submission of the sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the sponsor pays
any required user fees upon submission of the first section of the NDA.

The  FDA  may  give  a  priority  review  designation  to  drugs  or  biologics  that  are  designed  to  treat  a  serious  condition  and,  if  approved,  would
provide a significant improvement in safety or effectiveness compared to available therapies. A priority review means that the goal for the FDA to review
an application is six months, rather than the standard review of ten months. These six- and 10-month review periods are measured from the “filing” date
rather than the receipt date for NDAs for new molecular entities, which typically adds approximately two months to the timeline for review and decision
from the date of submission. Products that are eligible for fast-track designation may also be eligible for priority review.

In  addition,  products  studied  for  their  safety  and  effectiveness  in  treating  serious  or  life-threatening  illnesses  and  that  provide  meaningful
therapeutic benefit over existing treatments may be eligible for accelerated approval and may be approved on the basis of adequate and well-controlled
clinical  studies  establishing  that  the  product  has  an  effect  on  a  surrogate  endpoint  that  is  reasonably  likely  to  predict  clinical  benefit,  or  on  a  clinical
endpoint  that  can  be  measured  earlier  than  irreversible  morbidity  or  mortality,  that  is  reasonably  likely  to  predict  an  effect  on  irreversible  morbidity  or
mortality or other clinical benefit, taking into account the severity, rarity or prevalence of the condition and the availability or lack of alternative treatments.
As  a  condition  of  approval,  the  FDA  may  require  a  sponsor  of  a  drug  receiving  accelerated  approval  to  perform  post-marketing  studies  to  verify  and
describe  the  predicted  effect  on  irreversible  morbidity  or  mortality  or  other  clinical  endpoint,  and  the  drug  or  biologic  may  be  subject  to  expedited
withdrawal  procedures  if  the  sponsor  fails  to  conduct  the  required  post-marketing  studies,  or  such  post-marketing  studies  fail  to  confirm  the  predicted
clinical benefit.

Moreover, under the provisions of the Food and Drug Administration Safety and Innovation Act, or FDASIA, passed in July 2012, a sponsor can
request designation of a product candidate as a “breakthrough therapy.” A breakthrough therapy is defined as a drug or biologic that is intended, alone or in
combination with one or more other drugs or biologics, to treat a serious or life-threatening disease or condition, and preliminary clinical evidence indicates
that  the  product  may  demonstrate  substantial  improvement  over  existing  therapies  on  one  or  more  clinically  significant  endpoints,  such  as  substantial
treatment effects observed early in clinical development. This designation includes all of the features of fast track designation, as well as more intensive
FDA interaction and guidance. The breakthrough therapy designation is a distinct status from both accelerated approval and priority review, but these can
also be granted to the same product candidate if the relevant criteria are met. The FDA must take certain actions, such as holding timely meetings and
providing advice, intended to expedite the development and review of an application for approval of a breakthrough therapy.

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

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Post-Approval Requirements

Drugs and biologics marketed pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other
things, requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse
experiences with the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims are subject to
prior FDA review and approval. There also are continuing, annual user fee requirements.

Manufacturers are subject to periodic unannounced inspections by the FDA and state agencies for compliance with cGMP requirements. Changes
to  the  manufacturing  process  are  strictly  regulated  and,  depending  on  the  significance  of  the  change,  may  require  prior  FDA  approval  before  being
implemented.  FDA  regulations  also  require  investigation  and  correction  of  any  deviations  from  cGMP  and  impose  reporting  and  documentation
requirements upon us and any third-party manufacturers that we may decide to use. Accordingly, manufacturers must continue to expend time, money and
effort in the area of production and quality control to maintain compliance with cGMP and other aspects of regulatory compliance.

Discovery of previously unknown problems with a product or the failure to comply with applicable requirements may result in restrictions on a
product, manufacturer or holder of an approved NDA or BLA, including withdrawal or recall of the product from the market or other voluntary, FDA-
initiated  or  judicial  action  that  could  delay  or  prohibit  further  marketing.  Also,  new  government  requirements,  including  those  resulting  from  new
legislation, may be established, or the FDA’s policies may change, which could delay or prevent regulatory approval of our products under development.

The  FDA  may  withdraw  approval  if  compliance  with  regulatory  requirements  and  standards  is  not  maintained  or  if  problems  occur  after  the
product  reaches  the  market.  Later  discovery  of  previously  unknown  problems  with  a  product,  including  adverse  events  of  unanticipated  severity  or
frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new
safety  information;  imposition  of  post-market  studies  or  clinical  studies  to  assess  new  safety  risks;  or  imposition  of  distribution  restrictions  or  other
restrictions under a REMS program. Other potential consequences include, among other things:

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restrictions on the marketing or manufacturing of the product;  

complete withdrawal of the product from the market or product recalls;

fines, warning letters or holds on post-approval clinical studies;

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

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

injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs may be promoted
only for the approved indications and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and
regulations  prohibiting  the  promotion  of  off-label  uses,  and  a  company  that  is  found  to  have  improperly  promoted  off-label  uses  may  be  subject  to
significant liability.

Orphan Designation and Exclusivity

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as
a  disease  or  condition  with  a  patient  population  of  fewer  than  200,000  individuals  in  the  United  States,  or  a  patient  population  greater  than  200,000
individuals in the United States and when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the
United States will be recovered from sales in the United States for that drug or biologic. Orphan drug designation

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must be requested before submitting a BLA or NDA. After the FDA grants orphan drug designation, the generic identity of the therapeutic agent and its
potential orphan use are disclosed publicly by the FDA.

If a product that has orphan drug designation subsequently receives the first FDA approval for a particular active ingredient for the disease for
which it has such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications,
including  a  full  NDA  or  BLA,  to  market  the  same  drug  or  biologic  for  the  same  indication  for  seven  years,  except  in  limited  circumstances,  such  as  a
showing of clinical superiority to the product with orphan drug exclusivity or if FDA finds that the holder of the orphan drug exclusivity has not shown that
it can assure the availability of sufficient quantities of the orphan drug to meet the needs of patients with the disease or condition for which the drug was
designated. Orphan drug exclusivity does not prevent the FDA from approving a different drug or biologic for the same disease or condition, or the same
drug or biologic 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 BLA or NDA application user fee.

A designated orphan drug many not receive orphan drug exclusivity if it is approved for a use that is broader than the indication for which it
received  orphan  designation.  In  addition,  orphan  drug  exclusive  marketing  rights  in  the  United  States  may  be  lost  if  the  FDA  later  determines  that  the
request  for  designation  was  materially  defective  or,  as  noted  above,  if  the  second  applicant  demonstrates  that  its  product  is  clinically  superior  to  the
approved product with orphan exclusivity or the manufacturer of the approved product is unable to assure sufficient quantities of the product to meet the
needs of patients with the rare disease or condition.

Biosimilars and Exclusivity

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, or the Affordable Care Act,
signed into law in 2010, includes a subtitle called the Biologics Price Competition and Innovation Act of 2009, or BPCIA, which created an abbreviated
approval  pathway  for  biological  products  that  are  biosimilar  to  or  interchangeable  with  an  FDA-licensed  reference  biological  product.  To  date,  only  a
handful of biosimilars have been licensed under the BPCIA, although numerous biosimilars have been approved in Europe. The FDA has issued several
guidance documents outlining an approach to review and approval of biosimilars.

Biosimilarity, which requires that there be no clinically meaningful differences between the biological product and the reference product in terms
of  safety,  purity  and  potency,  can  be  shown  through  analytical  studies,  animal  studies  and  a  clinical  study  or  studies.  Interchangeability  requires  that  a
product is biosimilar to the reference product and the product must demonstrate that it can be expected to produce the same clinical results as the reference
product  in  any  given  patient  and,  for  products  that  are  administered  multiple  times  to  an  individual,  the  biologic  and  the  reference  biologic  may  be
alternated or switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of
the  reference  biologic.  However,  complexities  associated  with  the  larger,  and  often  more  complex,  structures  of  biological  products,  as  well  as  the
processes by which such products are manufactured, pose significant hurdles to implementation of the abbreviated approval pathway that are still being
worked out by the FDA.

Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference
product was first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date
on which the reference product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the
reference product if the FDA approves a full BLA for the competing product containing that applicant’s own preclinical data and data from adequate and
well-controlled  clinical  studies  to  demonstrate  the  safety,  purity  and  potency  of  its  product.  The  BPCIA  also  created  certain  exclusivity  periods  for
biosimilars approved as interchangeable products. At this juncture, it is unclear whether products deemed “interchangeable” by the FDA will, in fact, be
readily substituted by pharmacies, which are governed by state pharmacy law.

A  biological  product  can  also  obtain  pediatric  market  exclusivity  in  the  United  States.  Pediatric  exclusivity,  if  granted,  adds  six  months  to

existing exclusivity periods and patent terms. This six-month exclusivity, which runs

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from the end of other exclusivity protection or patent term, may be granted based on the voluntary completion of a pediatric study in accordance with an
FDA-issued “Written Request” for such a study.

The BPCIA is complex and continues to be interpreted and implemented by the FDA. In addition, recent government proposals have sought to
reduce the 12-year reference product exclusivity period. Other aspects of the BPCIA, some of which may impact the BPCIA exclusivity provisions, have
also been the subject of recent litigation. As a result, the ultimate impact, implementation, and impact of the BPCIA is subject to significant uncertainty.

Hatch-Waxman Amendments and Exclusivity

Section 505 of the FDCA describes three types of marketing applications that may be submitted to the FDA to request marketing authorization
for  a  new  drug.  A  Section  505(b)(1)  NDA  is  an  application  that  contains  full  reports  of  investigations  of  safety  and  efficacy.  A  505(b)(2)  NDA  is  an
application that contains full reports of investigations of safety and efficacy but where at least some of the information required for approval comes from
investigations that were not conducted by or for the applicant and for which the applicant has not obtained a right of reference or use from the person by or
for  whom  the  investigations  were  conducted.  This  regulatory  pathway  enables  the  applicant  to  rely,  in  part,  on  the  FDA’s  prior  findings  of  safety  and
efficacy  for  an  existing  product,  or  published  literature,  in  support  of  its  application.  Section  505(j)  establishes  an  abbreviated  approval  process  for  a
generic version of approved drug products through the submission of an Abbreviated New Drug Application, or ANDA. An ANDA provides for marketing
of  a  generic  drug  product  that  has  the  same  active  ingredients,  dosage  form,  strength,  route  of  administration,  labeling,  performance  characteristics  and
intended use, among other things, to a previously approved product. ANDAs are termed “abbreviated” because they are generally not required to include
preclinical (animal) and clinical (human) data to establish safety and efficacy. Instead, generic applicants must scientifically demonstrate that their product
is bioequivalent to, or performs in the same manner as, the innovator drug through in vitro, in vivo or other testing. The generic version must deliver the
same  amount  of  active  ingredients  into  a  subject’s  bloodstream  in  the  same  amount  of  time  as  the  innovator  drug  and  can  often  be  substituted  by
pharmacists under prescriptions written for the reference listed drug. In seeking approval for a drug through an NDA, applicants are required to list with the
FDA  each  patent  with  claims  that  cover  the  applicant’s  drug  or  a  method  of  using  the  drug.  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 competitors in support of approval of an ANDA or 505(b)(2) NDA.

Upon submission of an ANDA or a 505(b)(2) NDA, an applicant must certify to the FDA that (1) no patent information on the drug product that
is the subject of the application has been submitted to the FDA; (2) such patent has expired; (3) the date on which such patent expires; or (4) such patent is
invalid or will not be infringed upon by the manufacture, use or sale of the drug product for which the application is submitted. Generally, the ANDA or
505(b)(2) NDA cannot be approved until all listed patents have expired, except where the ANDA or 505(b)(2) NDA applicant challenges a listed patent
through the last type of certification, also known as a paragraph IV certification. If the applicant does not challenge the listed patents, or indicates that it is
not seeking approval of a patented method of use, the ANDA or 505(b)(2) NDA application will not be approved until all of the listed patents claiming the
referenced product have expired.

If the ANDA or 505(b)(2) NDA applicant has provided a Paragraph IV certification to the FDA, the applicant must send notice of the Paragraph
IV certification to the NDA and patent holders once the application 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. If the paragraph IV certification is challenged by an NDA holder or
the patent owner(s) asserts a patent challenge to the paragraph IV certification, the FDA may not approve that application until the earlier of 30 months
from the receipt of the notice of the paragraph IV certification, the expiration of the patent, when the infringement case concerning each such patent was
favorably decided in the applicant’s favor or settled, or such shorter or longer period as may be ordered by a court. This prohibition is generally referred to
as  the  30-month  stay.  In  instances  where  an  ANDA  or  505(b)(2)  NDA  applicant  files  a  paragraph  IV  certification,  the  NDA  holder  or  patent  owner(s)
regularly take action to trigger the 30-month stay, recognizing that the related patent litigation may take many months or years to resolve.

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The FDA also cannot approve an ANDA or 505(b)(2) application until all applicable non-patent exclusivities listed in the Orange Book for the
branded reference drug have expired. For example, a pharmaceutical manufacturer may obtain five years of non-patent exclusivity upon NDA approval of a
new chemical entity, or NCE, which is a drug containing an active moiety that has not been approved by FDA in any other NDA. An “active moiety” is
defined  as  the  molecule  responsible  for  the  drug  substance’s  physiological  or  pharmacologic  action.  During  that  five-year  exclusivity  period,  the  FDA
cannot accept for filing (and therefore cannot approve) any ANDA seeking approval of a generic version of that drug or any 505(b)(2) NDA that relies on
the FDA’s approval of the drug, provided that that the FDA may accept an ANDA four years into the NCE exclusivity period if the ANDA applicant also
files a Paragraph IV certification.

A drug, including one approved under Section 505(b)(2), may obtain a three-year period of exclusivity for a particular condition of approval, or
change to a marketed product, such as a new formulation for a previously approved product, if one or more new clinical studies (other than bioavailability
or  bioequivalence  studies)  was  essential  to  the  approval  of  the  application  and  was  conducted/sponsored  by  the  applicant.  Should  this  occur,  the  FDA
would be precluded from approving any ANDA or 505(b)(2) application for the protected modification until after that three-year exclusivity period has run.
However, unlike NCE exclusivity, the FDA can accept an application and begin the review process during the exclusivity period.

Other Healthcare Laws and Compliance Requirements

Pharmaceutical companies are subject to additional healthcare regulation and enforcement by the federal government and by authorities in the
states and foreign jurisdictions in which they conduct their business. Such laws include, without limitation, state and federal anti-kickback, fraud and abuse,
false claims, and physician sunshine laws and regulations. If their operations are found to be in violation of any of such laws or any other governmental
regulations  that  apply,  they  may  be  subject  to  penalties,  including,  without  limitation,  civil  and  criminal  penalties,  damages,  fines,  the  curtailment  or
restructuring of operations, exclusion from participation in federal and state healthcare programs and individual imprisonment.

Coverage and Reimbursement

Sales of any product depend, in part, on the extent to which such product will be covered by third-party payors, such as federal, state and foreign
government healthcare programs, commercial insurance and managed healthcare organizations and the level of reimbursement for such product by third-
party payors. Decisions regarding the extent of coverage and amount of reimbursement to be provided are made on a plan-by-plan basis. These third-party
payors are increasingly reducing reimbursements for medical products, drugs and services. For products administered under the supervision of a physician,
obtaining coverage and adequate reimbursement may be particularly difficult because of the higher prices often associated with such drugs. In addition, the
U.S.  government,  state  legislatures  and  foreign  governments  have  continued  implementing  cost-containment  programs,  including  price  controls,
restrictions  on  coverage  and  reimbursement  and  requirements  for  substitution  of  generic  products.  Adoption  of  price  controls  and  cost-containment
measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit sales of any product. Decreases
in third-party reimbursement for any product or a decision by a third-party payor not to cover a product could reduce physician usage and patient demand
for the product and also have a material adverse effect on sales.

Healthcare Reform

In March 2010, former President Obama signed the Affordable Care Act, which substantially changed the way healthcare is financed by both
governmental and private insurers in the United States, and significantly affected the pharmaceutical industry. The Affordable Care Act contains a number
of provisions, including those governing enrollment in federal healthcare programs, reimbursement adjustments and fraud and abuse changes. Additionally,
the Affordable Care Act increases the minimum level of Medicaid rebates payable by manufacturers of brand name drugs from 15.1% to 23.1%; requires
collection of rebates for drugs paid by Medicaid managed care organizations; requires manufacturers to participate in a coverage gap discount program,
under which they must agree to offer 70 percent point-of-sale discounts off negotiated prices of applicable brand drugs to eligible beneficiaries during

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their  coverage  gap  period,  as  a  condition  for  the  manufacturer’s  outpatient  drugs  to  be  covered  under  Medicare  Part  D;  and  imposes  a  non-deductible
annual fee on pharmaceutical manufacturers or importers who sell “branded prescription drugs” to specified federal government programs.

Since its enactment, there have been judicial and Congressional challenges to certain aspects of the Affordable Care Act, and we expect there
will be additional challenges and other efforts to repeal or replace the Affordable Care Act in the future. Other legislative changes have been proposed and
adopted since the Affordable Care Act was enacted, including aggregate reductions of Medicare payments to providers of 2% per fiscal year and reduced
payments  to  several  types  of  Medicare  providers.  Moreover,  there  has  recently  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.  Individual  states  in  the  United  States  have  also  become  increasingly  active  in  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.

Privacy and Security Laws

Numerous state, federal and foreign laws, including consumer protection laws and regulations, govern the collection, dissemination, use, access
to,  confidentiality  and  security  of  personal  information,  including  health-related  information.  In  the  United  States,  numerous  federal  and  state  laws  and
regulations, including data breach notification laws, health information privacy and security laws, including the federal Health Insurance Portability and
Accountability Act of 1996, or HIPAA, and federal and state consumer protection laws and regulations (e.g., Section 5 of the FTC Act), that govern the
collection, use, disclosure, and protection of health-related and other personal information could apply to our operations or the operations of our partners. In
addition, certain state and non-U.S. laws, such as the California Consumer Privacy Act, or the CCPA, the California Privacy Rights Act, or the CPRA, and
the  General  Data  Protection  Regulation,  or  the  GDPR,  govern  the  privacy  and  security  of  personal  data,  including  health-related  data  in  certain
circumstances, some of which are more stringent than HIPAA and many of which differ from each other in significant ways and may not have the same
effect, thus complicating compliance efforts. Failure to comply with these laws, where applicable, can result in the imposition of significant civil and/or
criminal penalties and private litigation.  Privacy and security laws, regulations, and other obligations are constantly evolving, may conflict with each other
to  complicate  compliance  efforts,  and  can  result  in  investigations,  proceedings,  or  actions  that  lead  to  significant  civil  and/or  criminal  penalties  and
restrictions on data processing.

Employees and Human Capital Resources

As of December 31, 2021, we had 65 employees, all of whom were full-time. Approximately 36% of our employees hold advanced degrees. On
February 2, 2022, we implemented a corporate restructuring to align our resources to focus on its UBX1325 program while further extending operating
capital. The restructuring resulted in an elimination of approximately half of our workforce, reducing staff to 34 full-time employees by the middle of the
year.

The  majority  of  our  employees  work  in  our  corporate  headquarters.  None  of  our  employees  are  represented  by  a  labor  union  or  a  collective

bargaining agreement and we consider our relationship with our employees to be good.

Our  human  capital  resources  objectives  are,  as  applicable,  identifying,  recruiting,  retaining,  incentivizing  and  integrating  our  existing  and
additional  employees.  As  such,  we  expend  considerable  time,  attention,  and  financial  resources  on  these  activities.  Our  corporate  culture,  which  is
underpinned  by  our  company  values,  is  the  overarching  framework  we  use  to  make  decisions  related  to  people  practices,  including  total  compensation,
short and long-term incentives, health and wellness, and employee engagement.

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Facilities

Our corporate headquarters are located in South San Francisco, California, where we currently lease approximately 62,000 square feet of office
and laboratory space pursuant to a lease dated February 28, 2019, of which approximately 23,000 square feet was subleased to Freenome Holdings, Inc. as
of June 2021 through August 31, 2024. The majority of our employees work at our corporate headquarters.

Legal Proceedings

We are not currently involved in any litigation or legal proceedings that, in management’s opinion, are likely to have any material adverse effect
on our company. While we know of no imminent legal action in which we are likely to be involved, we may in the future become engaged in litigation or
other legal proceedings. Regardless of the outcome, litigation can have an adverse impact due to defense fees, settlement costs, demands on management
attention, and other concerns.

We view our operations and manage our business as one reportable segment. See Note 1 in the Notes to Financial Statements included in this

Annual Report on Form 10-K.

Financial Information About Segments

About UNITY

We  were  incorporated  in  the  State  of  Delaware  on  March  30,  2009.  Our  registered  trademarks  include  UNITY  BIOTECHNOLOGY®. Other

service marks, trademarks and trade names referred to in this document are the property of their respective owners.

Available Information

We are subject to the information requirements of the Securities Exchange Act of 1934, as amended and we therefore file periodic reports, proxy
statements  and  other  information  with  the  U.S.  Securities  and  Exchange  Commission,  or  SEC,  relating  to  our  business,  financial  statements  and  other
matters. The SEC maintains an Internet site, www.sec.gov, that contains reports, proxy statements and other information regarding issuers such as UNITY.

For more information about UNITY, including free access to our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports
on  Form  8-K  and  amendments  to  those  reports,  visit  our  website,  www.unitybiotechnology.com.  The  information  found  on  or  accessible  through  our
website is not incorporated into, and does not form a part of, this Annual Report on Form 10-K.

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Item 1A. Risk Factors

This Annual Report on Form 10-K contains forward-looking information based on our current expectations. Because our business is subject to many risks
and our actual results may differ materially from any forward-looking statements made by or on behalf of us, this section includes a discussion of important
factors that could affect our business, operating results, financial condition and the trading price of our common stock. Many of the following risks and
uncertainties  have  been  and  may  continue  to  be  exacerbated  by  the  COVID-19  pandemic  and  any  worsening  of  the  global  business  and  economic
environment  as  a  result.  This  discussion  should  be  read  in  conjunction  with  the  other  information  in  this  Annual  Report  on  Form  10-K,  including  our
financial  statements  and  the  notes  accompanying  those  financial  statements  and  “Management’s  Discussion  and  Analysis  of  Financial  Condition  and
Results of Operations.” The occurrence of any of the events or developments described below could have a material adverse effect on our business, results
of  operations,  financial  condition,  prospects  and  stock  price.  Additional  risks  and  uncertainties  not  presently  known  to  us  or  that  we  currently  deem
immaterial may also impair our business.

Risk Factor Summary

Below is a summary of the principal factors that make an investment in our common stock speculative or risky. This summary does not address all of the
risks that we face. Additional discussion of the risks summarized in this risk factor summary, and other risks that we face, can be found below under the
heading “Risk Factors” and should be carefully considered, together with other information in this Quarterly Report on Form 10-Q and our other filings
with the Securities and Exchange Commission, or SEC, before making investment decisions regarding our common stock.

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We are a clinical-stage biopharmaceutical company with a limited operating history and no products approved for commercial sale. We have
incurred significant losses since our inception, and we anticipate that we will continue to incur losses for the foreseeable future, which, together
with our limited operating history, make it difficult to assess our future viability.

Our financial condition raises substantial doubt as to our ability to continue as a going concern. We will require substantial additional financing
to achieve our goals, and a failure to obtain this necessary capital when needed on acceptable terms, or at all, could force us to delay, limit,
reduce or terminate our product development programs, commercialization efforts or other operations.

We will require substantial additional financing to achieve our goals, and a failure to obtain this capital when needed on acceptable terms, or at
all, could force us to delay, limit, reduce or terminate our product development, other operations or commercialization efforts.

Our  core  therapeutic  approach  to  slow,  halt,  or  reverse  diseases  of  aging  is  based  on  our  understanding  of  cellular  senescence.  Utilizing
senolytic molecules to treat diseases of aging is a novel therapeutic approach, which exposes us to unforeseen risks and makes it difficult to
predict the time and cost of drug development and potential for regulatory approval.

Our business is currently dependent on the successful development and regulatory approval of UBX1325.

Other than UBX1325, all of our other programs are preclinical and face significant development risk.

The COVID-19 pandemic could adversely impact our business, including our clinical trials, and financial condition.

We rely on third-party suppliers to manufacture preclinical and clinical supplies of our drug candidates and we intend to continue to rely on
third  parties  to  produce  such  preclinical  and  clinical  supplies  as  well  as  commercial  supplies  of  any  approved  product.  The  loss  of  these
suppliers, costs and availability of inputs or supplies, supply issues whether or not related to the COVID-19 panademic, or the failure of those
manufacturers or suppliers to comply with applicable regulatory requirements or to provide us with

33

 
 
 
 
 
 
 
 
 
sufficient quantities at acceptable quality levels or prices, or at all, would materially and adversely affect our business.

•

•

We face significant competition in an environment of rapid technological and scientific change, and our drug candidates, if approved, will face
significant  competition  and  our  failure  to  effectively  compete  may  prevent  us  from  achieving  significant  market  penetration.  Most  of  our
competitors have significantly greater resources than we do, and we may not be able to successfully compete.

Our senolytic medicine platform and any future products that we commercialize could be alleged to infringe patent rights and other proprietary
rights of third parties, which may require costly litigation and, if we are not successful, could cause us to pay substantial damages and/or limit
our  ability  to  commercialize  our  products.  Even  if  we  obtain  regulatory  approval  for  a  drug  candidate,  our  products  will  remain  subject  to
regulatory scrutiny.

Risks Related to Our Limited Operating History, Financial Condition, and Capital Requirements

We are a clinical-stage biopharmaceutical company with a limited operating history and no products approved for commercial sale. We have incurred
significant losses since our inception, and we anticipate that we will continue to incur losses for the foreseeable future, which, together with our limited
operating history, make it difficult to assess our future viability.

We  are  a  clinical-stage  biopharmaceutical  company  with  a  limited  operating  history.  Biopharmaceutical  product  development  is  a  highly  speculative
undertaking and involves a substantial degree of risk. We have not yet sought approval for commercial sale of any products and therefore have no products
approved for commercial sale and have not generated any revenue from contracts with customers and have incurred losses in each year since our inception
in March 2009. We have only a limited operating history upon which you can evaluate our business and prospects. In addition, we have limited experience
and have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and
rapidly evolving fields, particularly in the biopharmaceutical industry.

We  have  had  significant  operating  losses  since  our  inception.  Our  net  loss  for  the  years  ended  December  31,  2021  and  2020  was  approximately  $60.7
million and $93.8 million, respectively. As of December 31, 2021, we had an accumulated deficit of $400.0 million. Substantially all of our losses have
resulted from expenses incurred in connection with our research and development programs and from general and administrative costs associated with our
operations. We expect to continue to incur losses for the foreseeable future, and we anticipate these losses will increase as we continue to develop our drug
candidates, conduct clinical studies and pursue research and development activities. Even if we achieve profitability in the future, we may not be able to
sustain profitability in subsequent periods. Our prior losses, combined with expected future losses, have had and will continue to have an adverse effect on
our stockholders’ equity and working capital.

Our financial condition raises substantial doubt as to our ability to continue as a going concern.

Our financial statements have been prepared assuming that we will continue to operate as a going concern, which contemplates the realization of assets and
the satisfaction of liabilities in the normal course of business. Based on our current operating plans, we expect our existing capital resources will fund our
planned operating expenses into the first quarter of 2023 which is expected to fund key clinical data readouts for UBX1325, but less than 12 months from
the  date  of  this  Annual  Report.  We  expect  to  continue  to  incur  net  operating  losses  for  at  least  the  next  several  years  as  we  continue  our  research  and
development  efforts,  advance  our  drug  candidates  through  preclinical  and  clinical  development,  seek  regulatory  approval,  prepare  for  and,  if  approved,
proceed to commercialization. We do not expect to generate revenue from any drug candidates that we develop until we obtain regulatory approval for one
or more of such drug candidates and commercialize our products or enter into collaborative agreements with third parties.

These conditions raise substantial doubt about our ability to continue as a going concern. Additionally, our independent registered public accounting firm
has included in its audit opinion for the year ended December 31,

34

 
 
 
 
2021 an explanatory paragraph that there is substantial doubt as to our ability to continue as a going concern. There is no assurance that funding will be
available to us, will be obtained on terms favorable to us or will provide us with sufficient funds to meet our objectives. The reaction of investors to the
inclusion of a going concern statement by our auditors and our potential inability to continue as a going concern may materially adversely affect our share
price and our ability to raise new capital or enter into partnerships. If we become unable to continue as a going concern, we may have to liquidate our assets
and the values we receive for our assets in liquidation or dissolution could be significantly lower than the values reflected in our financial statements.

We will require substantial additional financing to achieve our goals, and a failure to obtain this capital when needed on acceptable terms, or at all,
could force us to delay, limit, reduce or terminate our product development, other operations or commercialization efforts.

Since our inception, we have invested a significant portion of our efforts and financial resources in research and development activities. Preclinical studies
and clinical studies for our drug candidates and additional research and development activities to discover and develop new drug candidates will require
substantial funds to complete. As of December 31, 2021, we had capital resources consisting of cash, cash equivalents, and marketable securities of $90.1
million. We believe that we will continue to expend substantial resources for the foreseeable future in connection with our programs, including the clinical
development of UBX1325, and the development of any other drug candidates we may choose to pursue. These expenditures will include costs associated
with conducting preclinical studies and clinical studies, obtaining regulatory approvals, and manufacturing and supply, as well as marketing and selling any
products  approved  for  sale.  In  addition,  other  unanticipated  costs  may  arise.  Because  the  outcome  of  any  preclinical  study  or  clinical  study  is  highly
uncertain,  we  cannot  reasonably  estimate  the  actual  amounts  necessary  to  successfully  complete  the  development  and  commercialization  of  our  current
drug candidates or any future drug candidates.

In February 2022, we announced a restructuring to align resources to focus on our ongoing clinical programs and deliver on key development milestones.
These actions to prioritize our ophthalmology programs and implement cost saving measures were designed to enable us to achieve multiple key clinical
data readouts for UBX1325 as well as support the Tie2 and Tie2/VEGF bispecific program through advanced candidate nomination, with all other pipeline
programs paused to focus resources on these advanced programs.

Based on our current operating plans, we expect our existing capital resources will fund our planned operating expenses into the first quarter of 2023 which
is  expected  to  fund  key  clinical  data  readouts  for  UBX1325,  but  less  than  12  months  from  the  date  of  this  Annual  Report.  Accordingly,  our  financial
statements  have  been  prepared  on  a  going  concern  basis,  which  contemplates  the  continuity  of  operations,  realization  of  assets  and  the  satisfaction  of
liabilities  and  commitments  in  the  ordinary  course  of  business.  We  will  need  substantial  additional  capital  to  operate  our  business  and  continue  our
development activities. Our operating plans may change as a result of many factors currently unknown to us, and we may need to seek additional funds
sooner than planned, through public or private equity or debt financings or other sources, such as strategic collaborations. Such financing may result in
dilution  to  stockholders,  the  imposition  of  burdensome  debt  covenants  and  repayment  obligations,  or  other  restrictions  that  may  affect  our  business.
Adequate  funding  may  not  be  available  to  us  on  acceptable  terms,  or  at  all,  particularly  in  light  of  the  current  COVID-19  pandemic  and  associated
economic  uncertainty  and  potential  for  local  and/or  global  economic  recession.  In  addition,  we  may  seek  additional  capital  due  to  favorable  market
conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. If sufficient funds on acceptable
terms are not available when needed, we could be required to significantly reduce our operating expenses and delay, reduce the scope of, or eliminate one
or more of our development programs.

Our future capital requirements depend on many factors, including:

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the results of our ongoing clinical trials of UBX1325;

the scope, progress, results and costs of researching and developing our drug candidates, and conducting preclinical studies and clinical studies;

potential delays in or an increase in costs associated with our ongoing or planned preclinical studies or clinical trials as a result of the COVID-
19 pandemic;

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•

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the timing of, and the costs involved in, obtaining regulatory approvals for our current drug candidates or any future drug candidates;

the number and characteristics of any additional drug candidates we develop or acquire;

the timing and amount of any milestone payments we are required to make pursuant to our license agreements;

the cost of manufacturing our current drug candidates or any future drug candidates and any products we successfully commercialize;

the expenses needed to attract, hire, and retain skilled personnel;

the cost of commercialization activities if our current drug candidates or any future drug candidates are approved for sale, including marketing,
sales and distribution costs;

our ability to maintain existing, and establish new, strategic collaborations, licensing or other arrangements and the financial terms of any such
agreements, including the timing and amount of any future milestone, royalty or other payments due under any such agreement;

any product liability or other lawsuits related to our products;

the costs associated with being a public company;

the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing our intellectual property portfolio; and

the timing, receipt and amount of sales of any future approved products, if any.

Additional funds may not be available when we need them, on terms that are acceptable to us, or at all. If adequate funds are not available to us on a timely
basis, we may be required to:

•

•

•

delay, limit, reduce or terminate preclinical studies, clinical studies or other development activities for our current drug candidates or any future
drug candidate;

delay, limit, reduce or terminate our research and development activities; or

delay,  limit,  reduce  or  terminate  our  efforts  to  establish  manufacturing  and  sales  and  marketing  capabilities  or  other  activities  that  may  be
necessary to commercialize our current drug candidates or any future drug candidate, or reduce our flexibility in developing or maintaining our
sales and marketing strategy.

We also could choose or be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our
technologies or drug candidates that we would otherwise pursue on our own. We do not expect to realize revenue from sales of products or royalties from
licensed  products  in  the  foreseeable  future,  if  at  all,  and  unless  and  until  our  drug  candidates  are  clinically  tested,  approved  for  commercialization  and
successfully  marketed.  To  date,  we  have  primarily  financed  our  operations  through  the  sale  of  equity  securities.  We  will  be  required  to  seek  additional
funding in the future and currently intend to do so through collaborations, public or private equity offerings or debt financings, credit or loan facilities or a
combination of one or more of these funding sources. Our ability to raise additional funds will depend on financial, economic and other factors, many of
which  are  beyond  our  control.  For  example,  financial  markets  have  been  negatively  impacted  by  the  COVID-19  pandemic  and  associated  economic
uncertainty,  and  such  impact  may  be  exacerbated  as  the  COVID-19  pandemic  evolves  or  by  other  unforeseen  events  or  public  health  emergencies.
Additional funds may not be available to us on acceptable terms or at all. If we raise additional funds by issuing equity securities, our stockholders will
suffer dilution and the terms of any financing may adversely affect the rights of our stockholders. In addition, as a condition to providing additional funds
to us, future investors may demand, and may be granted,

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rights superior to those of existing stockholders. Debt financing, if available, is likely to involve restrictive covenants limiting our flexibility in conducting
future business activities, and, in the event of insolvency, debt holders would be repaid before holders of our equity securities received any distribution of
our corporate assets.

Our operating results may fluctuate significantly, which makes our future operating results difficult to predict and could cause our operating results to
fall below expectations.

Our quarterly and annual operating results may fluctuate significantly, making it difficult for us to predict our future operating results. These fluctuations
may occur due to a variety of factors, many of which are outside of our control and may be difficult to predict, including:

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•

the timing, cost and level of investment in research, development and, if approved, commercialization activities relating to our drug candidates,
which may change from time to time;

the timing and status of enrollment for our clinical studies;

the  cost  of  manufacturing  our  drug  candidates,  as  well  as  building  out  our  supply  chain,  which  may  vary  depending  on  the  quantity  of
production and the terms of our agreements with manufacturers;

expenditures we may incur to acquire, develop or commercialize additional drug candidates and technologies;

timing and amount of any milestone, royalty or other payments due under any collaboration or license agreement;

future accounting pronouncements or changes in our accounting policies;

the timing and success or failure of preclinical studies and clinical studies for our drug candidates or competing drug candidates, or any other
change in the competitive landscape of our industry, including consolidation among our competitors or partners;

the timing of receipt of approvals for our drug candidates from regulatory authorities in the United States and internationally;

coverage  and  reimbursement  policies  with  respect  to  our  drug  candidates,  if  approved,  and  potential  future  drugs  that  compete  with  our
products;

the level of demand for our products, if approved, which may vary significantly over time; and

potential disruption caused by the COVID-19 pandemic or other unforeseen events and public health emergencies.

The  cumulative  effects  of  these  factors  could  result  in  large  fluctuations  and  unpredictability  in  our  quarterly  and  annual  operating  results.  As  a  result,
comparing our operating results on a period-to-period basis may not be meaningful. Investors should not rely on our past results as an indication of our
future performance.

This variability and unpredictability could also result in our failing to meet the expectations of industry or financial analysts or investors for any period. If
our revenue or operating results fall below the expectations of analysts or investors or below any forecasts we may provide to the market, or if the forecasts
we provide to the market are below the expectations of analysts or investors, the price of our common stock could decline substantially. Such a stock price
decline could occur even when we have met any previously publicly stated revenue or earnings guidance we may provide.

37

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Risks Related to Our Business and Product Development

Our  core  therapeutic  approach  to  slow,  halt,  or  reverse  diseases  of  aging  is  based  on  our  understanding  of  cellular  senescence.  Utilizing  senolytic
molecules to treat diseases of aging is a novel therapeutic approach, which exposes us to unforeseen risks and makes it difficult to predict the time and
cost of drug development and potential for regulatory approval.

Our foundational science and lead drug candidate are based on senescence biology. We believe that we can develop drug candidates capable of eliminating
or  modulating  accumulated  senescent  cells,  when  administered  locally.  In  our  development  efforts  we  intend  to  explore  senolytic  medicines  that  use
multiple modalities. However, our approach to treating diseases of aging is novel and the scientific research that forms the basis of our efforts to develop
senolytic medicines is ongoing. We have only recently begun testing our senolytic molecules in humans and the majority of our current data supporting our
hypothesis regarding senescence biology is limited to pre-clinical animal models and in vitro cell lines, the results of which may not translate into humans.
We currently have no conclusive evidence in humans, that the accumulation or modulation of senescent cells is the underlying cause of tissue damage and
dysfunction associated with many diseases of aging. For example, we announced the 12-week results from our Phase 2 study of UBX0101 in patients with
moderate-to-severe painful OA of the knee. There was no statistically significant difference between any arm of UBX0101 and placebo at the 12-week
primary  endpoint  for  change  from  baseline  in  WOMAC-A,  an  established  measurement  of  pain  in  OA.  Given  these  results,  we  are  not  progressing
UBX0101 into pivotal studies and have narrowed our near-term focus to our ongoing ophthalmologic and neurologic disease programs.

Our current program, UBX1325, is a Bcl-xL inhibitor, and is intended to target senescent cells in the eye. While cellular senescence is a naturally occurring
biological process, the administration of senolytic medicines to eliminate or cause the elimination or modulation of accumulated senescent cells in humans
has not been widely tested and may potentially harm healthy tissue or result in unforeseen safety events, or fail to achieve the intended therapeutic purpose
entirely. We may also ultimately discover that our senolytic molecules do not possess certain properties required for therapeutic effectiveness, or that even
if found to be effective in one type of tissue, that such molecules will be effective in other tissues. In addition, given the novel nature of this therapeutic
approach,  designing  preclinical  and  clinical  studies  to  demonstrate  the  effect  of  senolytic  medicines  is  complex  and  exposes  us  to  unforeseen  risks.  In
addition, the scientific evidence to support the feasibility of developing systemic senolytic medicines is based primarily on preclinical data and not human
clinical trials. We may spend substantial funds attempting to develop these drug candidates and never succeed in doing so.

No  regulatory  authority  has  granted  approval  for  a  senolytic  medicine.  As  such,  we  believe  the  U.S.  Food  and  Drug  Administration,  or  the  FDA,  has
limited experience with senescence, which may increase the complexity, uncertainty and length of the clinical development and regulatory approval process
for  our  drug  candidates.  We  may  never  receive  approval  to  market  and  commercialize  any  drug  candidate.  Even  if  we  obtain  regulatory  approval,  the
approval may be for targets, disease indications or patient populations that are not as broad as we intended or desired or may require labeling that includes
significant use or distribution restrictions or safety warnings. We may be required to perform additional or unanticipated clinical studies to obtain approval
or be subject to post-marketing testing requirements to maintain marketing authorization. If our other senolytic molecules prove to be ineffective, unsafe or
commercially unviable, our entire senolytic platform and pipeline would have little, if any, value, which would have a material and adverse effect on our
business, financial condition, results of operations and prospects.

Our business is currently dependent on the successful development of UBX1325 which is in early stages of clinical development.

We have no products approved for sale and all of our drug candidates are in early stages of development. We have one product candidate, UBX1325, in
clinical development and we have ceased development of UBX0101 following our Phase 2 trial and are focused on advancing our ophthalmology program.
In particular, in October 2020, we initiated a Phase 1 clinical study of UBX1325 in patients with DME or nAMD for whom anti-VEGF therapy was no
longer considered beneficial, and in July, October, and November 2021, we announced positive data up to 24 weeks from this Phase 1 study. We initiated a
Phase  2a  proof-of-concept  clinical  study  of  UBX1325  in  DME  in  May  2021  and  dosed  the  first  patient  in  June  2021  and  expect  12-week  safety  and
efficacy data by mid-2022. In March 2022 we also enrolled our first patient in our Phase 2 proof-of-concept study in nAMD, and we expect to share 16-
week

38

 
data in the fourth quarter of 2022. However,  the  impact  of  the  COVID-19  pandemic  on  the  timing  of  study  initiations,  enrollment,  visit  adherence,  and
completions  is  hard  to  assess  due  the  continually  evolving  nature  of  the  situation  and  it  is  possible  that  the  study  enrollment,  visit  adherence,  and
completion may be delayed.

In February 2022, we announced a restructuring to align resources to focus on our ongoing clinical programs and deliver on key development milestones.
These actions to prioritize our ophthalmology programs and implement cost saving measures were designed to enable us to achieve multiple key clinical
data readouts for UBX1325. As a result, our business is currently dependent on the successful development of UBX1325. The success of our business,
including our ability to finance our company and generate any revenue in the future, will primarily depend on the successful development of UBX1325. If
UBX1325 does not demonstrate clinical benefit or we encounter safety issues with UBX1325, we may be required to significantly delay or abandon its
development. In the event UBX1325 is not successful in clinical development, we have limited resources and capital with which to develop additional drug
candidates and we may be forced to sell or liquidate our business.

The clinical and commercial success of UBX1325 and any other future drug candidates will depend on a number of factors, including the following:

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our ability to raise any additional required capital on acceptable terms, or at all;

our ability to complete IND-enabling studies and successfully submit an IND or comparable applications in foreign jurisdictions;

timely completion of our preclinical studies and clinical studies, which may be significantly slower or cost more than we currently anticipate
and  will  depend  substantially  upon  the  performance  of  third-party  contractors,  some  of  whom  could  be  adversely  impacted  by  unforeseen
events such as pandemics and public health emergencies, such as the COVID-19 pandemic;

whether we are required by the FDA or similar foreign regulatory agencies to conduct additional clinical studies or other studies beyond those
planned to support the approval and commercialization of our drug candidates or any future drug candidates;

acceptance of our proposed indications and primary endpoint assessments relating to the proposed indications of our drug candidates by the
FDA and similar foreign regulatory authorities;

our ability to demonstrate to the satisfaction of the FDA and similar foreign regulatory authorities the safety, efficacy, and acceptable risk-to-
benefit profile of our current drug candidates or any future drug candidates;

the prevalence, duration and severity of potential side effects or other safety issues experienced with our drug candidates or future approved
products, if any;

the timely receipt of necessary marketing approvals from the FDA and similar foreign regulatory authorities;

achieving  and  maintaining,  and,  where  applicable,  ensuring  that  our  third-party  contractors  achieve  and  maintain  compliance  with  our
contractual obligations and with all regulatory requirements applicable to our current drug candidates or any future drug candidates or approved
products, if any;

the  willingness  of  physicians,  professional  societies,  operators  of  clinics,  hospitals,  and  patients  to  recommend,  utilize,  or  adopt  any  of  our
future drug candidates to treat diseases of aging;

the  ability  of  third  parties  with  whom  we  contract  to  manufacture  adequate  clinical  study  and  commercial  supplies  of  our  current  drug
candidates or any future drug candidates, to remain in good standing with regulatory agencies and develop, validate and maintain commercially
viable manufacturing processes that are compliant with current good manufacturing practices, or cGMP;

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our ability to successfully develop a commercial strategy and thereafter commercialize our drug candidates or any future drug candidates in the
United  States,  and  internationally,  if  approved  for  marketing,  reimbursement,  sale  and  distribution  in  such  countries  and  territories,  whether
alone or in collaboration with others;

the convenience of our treatment or dosing regimen;

acceptance  by  physicians,  payors,  and  patients  of  the  benefits,  safety,  and  efficacy  of  our  drug  candidates  or  any  future  drug  candidates,  if
approved, including relative to alternative and competing treatments;

patient demand for our drug candidates, if approved;

our ability to establish and enforce intellectual property rights in and to our drug candidates or any future drug candidates; and

our ability to avoid third-party patent interference, intellectual property challenges, or intellectual property infringement claims.

These  factors,  many  of  which  are  beyond  our  control,  could  cause  us  to  experience  significant  delays  or  be  unable  to  obtain  regulatory  approvals  or
commercialize  our  drug  candidates.  In  addition,  disruptions  caused  by  the  COVID-19  pandemic  may  increase  the  likelihood  that  we  encounter  such
difficulties  or  delays  in  developing,  obtaining  regulatory  approvals  for  or  commercializing  our  product  candidates.  Even  if  regulatory  approvals  are
obtained, we may never achieve success in commercializing any of our drug candidates. Accordingly, we cannot provide assurances that we will be able to
generate sufficient revenue through the sale of our drug candidates or any future drug candidates to continue our business or achieve profitability.

Other than UBX1325, all of our other programs are preclinical and face significant development risk.  

Other than UBX1325, all of our other programs are in preclinical and early research stage. In addition, we have limited resources for which to develop any
products other than UBX1325. Given the early stage nature of these programs, each of the drug candidates and programs faces substantial development
risk. UBX0101 and UBX1325 are the only drug candidates that we have administered to humans, and as such, we face significant translational risk with
our  earlier  stage  drug  candidates.  We  may  also  be  required  by  the  FDA  or  similar  foreign  regulatory  agencies  to  conduct  additional  preclinical  studies
beyond those planned to support the commencement of additional clinical trials. Accordingly, there can be no assurance that we are able to bring any of our
preclinical product candidates or development programs into the clinic or otherwise successfully develop them.

Clinical development involves a lengthy and expensive process with an uncertain outcome, and results of earlier studies and trials may not be predictive
of future trial results.

Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure or delay can occur at any time during the
clinical study process. Success in preclinical studies and early clinical studies does not ensure that later clinical studies will be successful. A number of
companies in the biotechnology, and pharmaceutical industries have suffered significant setbacks in clinical studies, even after positive results in earlier
preclinical  studies  or  clinical  studies.  These  setbacks  have  been  caused  by,  among  other  things,  preclinical  findings  made  while  clinical  studies  were
underway and safety or efficacy observations made in clinical studies, including previously unreported adverse events. The results of our preclinical animal
studies or studies in ex vivo human tissues may not be predictive of the results of outcomes in human clinical studies. For example, our senolytic molecules
may demonstrate different chemical and pharmacological properties in patients than they do in laboratory studies or may interact with human biological
systems in unforeseen or harmful ways.

Drug  candidates  in  later  stages  of  clinical  studies  may  fail  to  show  the  desired  pharmacological  properties  or  safety  and  efficacy  traits  despite  having
progressed through preclinical studies and initial clinical studies. Notwithstanding any promising results in earlier studies, we cannot be certain that we will
not face similar setbacks. Even if we are

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able to initiate and complete clinical studies, the results may not be sufficient to obtain regulatory approval for our drug candidates.

We cannot be certain that studies or trials for our drug candidates will begin on time, not require redesign, enroll an adequate number of subjects on time or
be completed on schedule, if at all. The COVID-19 pandemic could cause or exacerbate these factors. For example, for our Phase 1 and Phase 2a or Phase
2 studies for UBX1325, clinical sites may be unable to recruit and retain investigators and study staff, screen and enroll patients, patients may be unable to
adhere to the study visit schedule, and the completion of the study could be delayed. Clinical studies can be prolonged, delayed or terminated for a variety
of reasons, including:

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the  FDA  or  comparable  foreign  regulatory  authorities  disagreeing  with  or  requiring  changes  to  the  design  or  implementation  of  our  clinical
studies;

delays in obtaining regulatory approval to commence or continue a trial;

reaching agreement on acceptable terms with prospective contract research organizations, or CROs, and clinical study sites, the terms of which
can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

obtaining institutional review board, or IRB, approval at each trial site;

recruiting an adequate number of suitable patients to participate in a trial;

having subjects complete a trial or return for post-treatment follow-up;

encountering difficulties in gathering the range of biological data from patients needed to fully assess the impact of our drug candidates;

clinical sites deviating from trial protocol or dropping out of a trial;

addressing subject safety concerns that arise during the course of a trial;

adding a sufficient number of clinical study sites; or

obtaining sufficient product supply of drug candidate for use in preclinical studies or clinical studies from third-party suppliers some of whom
could be adversely impacted by unforeseen events such as pandemics and public health emergencies, such as the COVID-19 pandemic.

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

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clinical  studies  of  our  drug  candidates  may  produce  negative  or  inconclusive  results,  and  we  may  decide,  or  regulators  may  require  us,  to
modify  clinical  study  design,  conduct  additional  clinical  studies  or  abandon  drug  development  programs,  including  all  of  our  senolytic
programs;

the number of patients required for clinical studies of our drug candidates may be larger than we anticipate, enrollment in these clinical studies
may be slower than we anticipate, or participants may drop out of these clinical studies at a higher rate than we anticipate;

our third-party contractors may fail to comply with regulatory requirements, fail to maintain adequate quality controls, or be unable to provide
us with sufficient product supply to conduct and complete preclinical studies or clinical studies of our drug candidates in a timely manner, or at
all;

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we or our investigators might have to suspend or terminate clinical studies of our drug candidates for various reasons, including noncompliance
with regulatory requirements, a finding that our drug candidates have undesirable side effects or other unexpected characteristics, a finding that
the participants are being exposed to unacceptable health risks, or due to unforeseen events such as pandemics and public health emergencies,
such as the COVID-19 pandemic;

the cost of clinical studies of our drug candidates may be greater than we anticipate;

the quality of our drug candidates or other materials necessary to conduct preclinical studies or clinical studies of our drug candidates may be
inadequate;

regulators may revise the requirements for approving our drug candidates, or such requirements may not be as we anticipate; and

future collaborators may conduct clinical studies in ways they view as advantageous to them but that are suboptimal for us.

If we are required to conduct additional clinical studies or other testing of our drug candidates beyond those that we currently contemplate, if we are unable
to successfully complete clinical studies of our drug candidates or other testing, if the results of these trials or tests are not positive or are only moderately
positive, or if there are safety concerns, we may:

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incur unplanned costs;

be delayed in obtaining marketing approval for our drug candidates or fail to obtain marketing approval at all;

obtain marketing approval in some countries and not in others;

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

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

be subject to additional post-marketing testing requirements; or

have the treatment removed from the market after obtaining marketing approval.

We could also encounter delays if a clinical study is suspended or terminated by us, by the IRBs of the institutions in which such trials are being conducted,
by the Data Safety Monitoring Board, or DSMB, for such trial or by the FDA or other regulatory authorities. Such authorities may suspend or terminate a
clinical  study  due  to  a  number  of  factors,  including  failure  to  conduct  the  clinical  study  in  accordance  with  regulatory  requirements  or  our  clinical
protocols, inspection of the clinical study operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold,
unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from using a drug, changes in governmental regulations or administrative
actions or lack of adequate funding to continue the clinical study.

Further,  conducting  clinical  studies  in  foreign  countries,  as  we  may  do  for  certain  of  our  drug  candidates,  presents  additional  risks  that  may  delay
completion  of  our  clinical  studies.  These  risks  include  the  failure  of  enrolled  patients  in  foreign  countries  to  adhere  to  clinical  protocol  as  a  result  of
differences in healthcare services or cultural customs, managing additional administrative burdens associated with foreign regulatory schemes, as well as
political  and  economic  risks  relevant  to  such  foreign  countries,  including  those  caused  by  unforeseen  events  such  as  pandemics  and  public  health
emergencies similar to the COVID-19 pandemic.

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Principal  investigators  for  our  clinical  studies  may  serve  as  scientific  advisors  or  consultants  to  us  from  time  to  time  and  may  receive  cash  or  equity
compensation in connection with such services. If these relationships and any related compensation result in perceived or actual conflicts of interest, or a
regulatory  authority  concludes  that  the  financial  relationship  may  have  affected  the  interpretation  of  the  trial,  the  integrity  of  the  data  generated  at  the
applicable clinical study site may be questioned and the utility of the clinical study itself may be jeopardized, which could result in the delay or rejection of
the marketing application we submit. Any such delay or rejection could prevent or delay us from commercializing our current or future drug candidates.

If we experience termination or delays in the completion of any preclinical study or clinical study of our drug candidates, the commercial prospects of our
drug candidates may be harmed, and our ability to generate revenues from any of these drug candidates will be delayed or unrealized. In addition, any
delays  in  completing  our  clinical  studies  may  increase  our  costs,  slow  down  our  drug  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 studies may also ultimately lead to the denial
of regulatory approval of our drug candidates. If one or more of our drug candidates or our senescence technology generally prove to be ineffective, unsafe
or commercially unviable, our platform and pipeline would have significantly diminished value, which would have a material and adverse effect on our
business, financial condition, results of operations and prospects.

The COVID-19 pandemic could adversely impact our business, including our clinical trials, and financial condition.

The COVID-19 pandemic and government measures taken in response have had a significant impact, both direct and indirect, on businesses and commerce,
as worker shortages have occurred, supply chains have been disrupted, facilities and production have been suspended, and demand for certain goods and
services, such as medical services and supplies, has spiked, while demand for other goods and services, such as travel, has fallen. In response to the spread
of COVID-19, as of mid-March 2020, we transitioned to a reduced onsite staffing model and implemented a remote work plan for all of our employees
other  than  those  providing  essential  services,  such  as  our  laboratory  staff.  In  parallel  with  applicable  law  and  regulations,  in  June  2021  and  again  in
February 2022 we began transitioning our staff back to the office but are continuing to monitor and adjust as the COVID-19 pandemic evolves. For onsite
employees, we have implemented heightened safety measures designed to comply with applicable federal, state and local guidelines. We may be required
to take additional actions that could impact our operations if required by applicable laws or regulations or if we determine them to be in the best interests of
our employees.

For the Phase 1 safety and tolerability clinical study and the Phase 2 proof-of-concept clinical studies for UBX1325, we adapted the clinical study protocol
and standard operating procedures to enable a number of adaptations such as: remote data collection for clinical sites if needed; the option for remote data
source verification procedures to limit on-site monitoring; transportation options for patients to utilize for study visit adherence; flexible visit windows to
increase study visit adherence; and geographic distribution of sites to mitigate variation in local restrictions.

These actions enable the collection of all major endpoints if patients adhere with the study visit schedule. Assessments that require an on-site visit may be
missed for some or all patients including laboratory evaluations, clinical examinations, or imaging.

Although one of the manufacturers in our supply chain for UBX0101 experienced a two-week shutdown in April 2020 due to a COVID-19 related incident
and there have been some delays in shipments due to a reduction in overall flights, neither of these factors impacted our supply of UBX0101 prior to our
decision  to  shut  down  further  clinical  advancement  of  that  program.  There  have  been  no  other  disruptions  in  our  supply  chain  of  drug  manufacturers
necessary to conduct our ongoing clinical trials, including our Phase 1 and Phase 2 studies in ophthalmology disease.

Several of the contract research organizations, or CROs, that provide preclinical services to us are based in China and India and experienced temporary
shutdowns  in  February  and  March  due  to  government  mandates.  In  each  case  we  were  able  to  reassign  the  balance  of  activities  to  other  CROs  and  the
shutdowns  did  not  impact  our  preclinical  timelines.  CROs  based  in  the  United  States  that  provide  preclinical  services  are  experiencing  heavy  demand,
which

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may impact their ability to start new studies and could lead to delays in the commencement of our preclinical studies. Several of our U.S.-based academic
research  partners  have  also  experienced  shutdowns  which  has  slowed  progress  on  several  early-stage  projects,  none  of  which  impacted  our  preclinical
timelines.

As the COVID-19 pandemic continues, we may experience disruptions that could severely impact our business and clinical trials, including:

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delays or difficulties in enrolling patients in our clinical trials;

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

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

interruption of key clinical trial activities, such as clinical trial site monitoring, due to limitations on travel imposed or recommended by federal
or state governments, employers and others or interruption of clinical trial subject visits and study procedures, the occurrence of which could
affect the integrity of clinical trial data;

risk  that  participants  enrolled  in  our  clinical  trials  will  contract  the  COVID-19  coronavirus  while  the  clinical  trial  is  ongoing,  which  could
impact the results of the clinical trial, including by increasing the number of observed adverse events;

limitations  in  employee  resources  that  would  otherwise  be  focused  on  the  conduct  of  our  clinical  trials,  including  because  of  sickness  of
employees or their families or the desire of employees to avoid contact with large groups of people;

delays in receiving authorizations from local regulatory authorities to initiate our planned clinical trials;

delays in clinical sites receiving the supplies and materials needed to conduct our clinical trials;

interruption in global shipping that may affect the transport of clinical trial materials, such as investigational drug product used in our clinical
trials;

changes in local regulations as part of a response to the COVID-19 pandemic which may require us to change the ways in which our clinical
trials are conducted, which may result in unexpected costs, or to discontinue such clinical trials altogether;

interruptions, delays, or increased costs in preclinical studies due to restricted or limited operations or supplies at our research and development
laboratory facilities;

delays  in  necessary  interactions  with  local  regulators,  ethics  committees  and  other  important  agencies  and  contractors  due  to  limitations  in
employee resources or forced furlough of government employees; and

refusal of the FDA to accept data from clinical trials in affected geographies outside the United States.

The global pandemic of the COVID-19 coronavirus continues to evolve. The extent to which the COVID-19 pandemic may impact our business, including
our clinical trials, and financial condition will depend on future developments, which are highly uncertain and cannot be predicted with confidence, such as
the ultimate geographic spread of the disease, the duration of the pandemic, the adoption and efficacy of vaccines, travel restrictions and social distancing
in  the  United  States  and  other  countries,  business  closures  or  business  disruptions  and  the  effectiveness  of  actions  taken  in  the  United  States  and  other
countries to contain and treat the disease.

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If  we  encounter  difficulties  enrolling  patients  in  our  clinical  studies,  our  clinical  development  activities  could  be  delayed  or  otherwise  adversely
affected.

The timely completion of clinical studies in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of
patients who remain in the study until its conclusion. We may experience difficulties in patient enrollment in our clinical studies for a variety of reasons.
The enrollment of patients depends on many factors, some of which could be exacerbated by the COVID-19 pandemic, including:

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the patient eligibility criteria defined in the protocol;

the size of the patient population required for analysis of the trial’s primary endpoints;

the proximity of patients to trial sites;

patients’ fear of visiting or traveling to trial sites during the COVID-19 pandemic;

the design of the trial;

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

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

our ability to obtain and maintain patient consents.

In addition, our clinical studies may compete with other clinical studies for drug candidates that are in the same therapeutic areas as our drug candidates.
This  competition  will  reduce  the  number  and  types  of  patients  available  to  us,  because  some  patients  who  might  have  opted  to  enroll  in  our  trials  may
instead opt to enroll in a trial being conducted by one of our competitors. Since the number of qualified clinical investigators is limited, we may conduct
some of our clinical studies at the same clinical study sites that some of our competitors use, which will reduce the number of patients who are available for
our clinical studies in such clinical study site.

Further, the administration of senolytic medicines designed to eliminate or cause the elimination of senescent cells and thereby modulate their associated
SASP may result in unforeseen events, including by harming healthy tissues. As a result, it is possible that safety concerns could negatively affect patient
enrollment  among  the  patient  populations  that  we  intend  to  treat,  including  among  those  in  indications  with  a  low  risk  of  mortality.  Delays  in  patient
enrollment may result in increased costs or may affect the timing or outcome of the planned clinical studies, which could prevent completion of these trials
and adversely affect our ability to advance the development of our drug candidates.

Interim,  “top-line”  and  preliminary  data  from  our  clinical  trials  that  we  announce  or  publish  from  time  to  time  may  change  as  more  patient  data
become available and are subject to audit and verification procedures that could result in material changes in the final data.

From time to time, we may publicly disclose top-line or preliminary data from our clinical trials, which is based on a preliminary analysis of then-available
data, and the results and related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular
study or trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have received or had
the opportunity to fully and carefully evaluate all data. As a result, the top-line or preliminary results that we report may differ from future results of the
same studies, or different conclusions or considerations may qualify such results, once additional data have been received and fully evaluated. Top-line or
preliminary data also remain subject to audit and verification procedures that may result in the final data being materially different from the top-line or
preliminary data we previously published. As a result, top-line and preliminary data should be viewed with caution until the final data are available.

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From time to time, we may also disclose interim data from our preclinical studies and clinical trials. Interim data from clinical trials that we may conduct
are  subject  to  the  risk  that  one  or  more  of  the  clinical  outcomes  may  materially  change  as  patient  enrollment  continues  and  more  patient  data  become
available. Adverse differences between interim data and final data could significantly harm our business prospects. Further, disclosure of interim data by us
or by our competitors could result in volatility in the price of our common stock.

Further,  others,  including  regulatory  agencies,  may  not  accept  or  agree  with  our  assumptions,  estimates,  calculations,  conclusions  or  analyses  or  may
interpret or weigh the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the
particular product candidate or product, our ability to make certain claims about our products, and our company in general. In addition, the information we
choose to publicly disclose regarding a particular study or clinical trial is based on what is typically extensive information, and you or others may not agree
with what we determine is material or otherwise appropriate information to include in our disclosure.

If  the  interim,  top-line  or  preliminary  data  that  we  report  differ  from  actual  results,  or  if  others,  including  regulatory  authorities,  disagree  with  the
conclusions  reached,  our  ability  to  obtain  approval  for,  and  commercialize,  our  product  candidates  may  be  harmed,  which  could  harm  our  business,
operating results, prospects or financial condition.

Our  drug  candidates  may  cause  undesirable  side  effects  or  have  other  properties  that  could  delay  or  prevent  their  regulatory  approval,  limit  the
commercial profile of an approved label, or result in significant negative consequences following marketing approval, if any.

Undesirable side effects caused by our drug candidates could cause us or regulatory authorities to interrupt, delay or halt clinical studies and could result in
a  more  restrictive  label  or  the  delay  or  denial  of  regulatory  approval  by  the  FDA  or  comparable  foreign  regulatory  authorities.  Other  than  our  clinical
studies  of  UBX0101  and  UBX1325,  senolytic  medicines  designed  to  eliminate  or  cause  the  elimination  of  senescent  cells  have  never  been  tested  in
humans.  As  a  result,  although  UBX1325  has  been  well  tolerated  in  our  Phase  1  and  Phase  2  clinical  studies  with  no  adversities  that  would  prevent
advancement into later stage clinical trials as of March 2022, UBX1325 could reveal a high and unacceptable severity and prevalence of side effects, and it
is possible that patients enrolled in such clinical studies could respond in unexpected ways. For instance, in preclinical in vivo animal and ex vivo human
tissue studies, our senolytic molecules have exhibited clearance of senescent cells; however, the elimination of accumulated senescent cells may result in
unforeseen events, including harming healthy cells or tissues. In addition, the entry by cells into a senescent state is a natural biological process that we
believe may have protective effects, such as halting the proliferation of damaged cells. The treatment of tissues with senolytic molecules could interfere
with such protective processes.

If unacceptable side effects arise in the development of our drug candidates, we, the FDA, the IRBs at the institutions in which our studies are conducted,
or  the  DSMB  could  suspend  or  terminate  our  clinical  studies,  or  the  FDA  or  comparable  foreign  regulatory  authorities  could  order  us  to  cease  clinical
studies or deny approval of our drug candidates for any or all targeted indications. Treatment-related side effects could also affect patient recruitment or the
ability of enrolled patients to complete any of our clinical studies or result in potential product liability claims. In addition, these side effects may not be
appropriately recognized or managed by the treating medical staff. We expect to have to train medical personnel using our drug candidates to understand
the  side  effect  profiles  for  our  clinical  studies  and  upon  any  commercialization  of  any  of  our  drug  candidates.  Inadequate  training  in  recognizing  or
managing the potential side effects of our drug candidates could result in patient injury or death. Any of these occurrences may harm our business, financial
condition and prospects significantly.

In  addition,  even  if  we  successfully  advance  any  of  our  drug  candidates  into  and  through  clinical  studies,  such  trials  will  likely  only  include  a  limited
number of subjects and limited duration of exposure to our drug candidates. As a result, we cannot be assured that adverse effects of our drug candidates
will not be uncovered when a significantly larger number of patients are exposed to the drug candidate. Further, clinical studies may not be sufficient to
determine the effect and safety consequences of taking our drug candidates over a multi-year period. There can be no assurance that it will demonstrate a
similarly favorable safety profile in subsequent clinical trials.

If any of our drug candidates receives marketing approval, and we or others later identify undesirable side effects caused by such products, a number of
potentially significant negative consequences could result, including:

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regulatory authorities may withdraw their approval of the product;

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

additional  restrictions  may  be  imposed  on  the  marketing  of  the  particular  product  or  the  manufacturing  processes  for  the  product  or  any
component thereof;

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

we may be required to implement a Risk Evaluation and Mitigation Strategy, or REMS, or create a Medication Guide outlining the risks of such
side effects for distribution to patients;

we could be sued and held liable for harm caused to patients;

the product may become less competitive; and

our reputation may suffer.

Any of the foregoing events could prevent us from achieving or maintaining market acceptance of the particular drug candidate, if approved, and result in
the loss of significant revenues to us, which would materially and adversely affect our results of operations and business. In addition, if one or more of our
drug candidates or our senescence approach generally prove to be unsafe, our entire platform and pipeline could be affected, which would have a material
and adverse effect on our business, financial condition, results of operations and prospects.

We may not be successful in our efforts to continue to create a pipeline of drug candidates or to develop commercially successful products. If we fail to
successfully identify and develop additional drug candidates, our commercial opportunity may be limited.

We  are  committed  to  developing  senolytic  medicines  that  slow,  halt,  or  reverse  diseases  of  aging,  and  we  are  currently  advancing  multiple  senolytic
molecules to address a variety of diseases of aging, including ophthalmologic disorders. As senolytic medicines are not limited to intervention by a single
mode  of  action  or  molecular  target,  we  believe  that  we  can  modulate  a  number  of  biologic  pathways  in  order  to  trigger  the  beneficial  elimination  of
senescent cells. However, our core therapeutic approach is based on our belief that senescent cells drive diseases of aging, and that hypothesis has not yet
been proven. In addition, we do not know if we will be able to develop medicines that selectively eliminate senescent cells or whether the elimination of
such senescent cells will mitigate the effects of or effectively treat any diseases.

In addition, identifying, developing, obtaining regulatory approval and commercializing drug candidates for the treatment of diseases of aging will require
substantial additional funding and is prone to the risks of failure inherent in drug development. Research programs to identify drug candidates also require
substantial technical, financial and human resources, regardless of whether or not any drug candidates are ultimately identified, and even if our preclinical
research programs initially show promise in identifying potential drug candidates, they may fail to yield drug candidates for clinical development.

While we have a number of ongoing drug discovery programs targeting senescent cells, we do not know whether these will be successful, or whether we
will  be  able  to  identify  novel  senolytic  mechanisms  to  continue  to  build  our  pipeline.  We  also  cannot  provide  any  assurance  that  we  will  be  able  to
successfully identify or acquire additional drug candidates, advance any of these additional drug candidates through the development process, successfully
commercialize  any  such  additional  drug  candidates,  if  approved,  or  assemble  sufficient  resources  to  identify,  acquire,  develop  or,  if  approved,
commercialize additional drug candidates. If we are unable to successfully identify, acquire, develop and commercialize additional drug candidates, our
commercial opportunities may be limited.

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We may be unable to obtain regulatory approval for our drug candidates under applicable regulatory requirements. The denial or delay of any such
approval would delay commercialization of our drug candidates and adversely impact our potential to generate revenue, our business and our results of
operations.

To gain approval to market our drug candidates, we must provide the FDA and foreign regulatory authorities with clinical data that adequately demonstrate
the safety and efficacy of the drug candidate for the intended indication applied for in the applicable regulatory filing. For our senolytic medicines, we must
also  demonstrate  that  eliminating  or  causing  the  elimination  of  senescent  cells  and  modulating  relevant  associated  SASP  factors  will  lead  to  the
improvement of well-defined and measurable endpoints.

We have not previously submitted a new drug application, or NDA, or biologics license application, or BLA, to the FDA, or similar approval filings to
comparable  foreign  regulatory  authorities.  An  NDA,  BLA  or  other  relevant  regulatory  filing  must  include  extensive  preclinical  and  clinical  data  and
supporting information to establish that the drug candidate is safe and effective, or that a biological drug candidate is safe, pure and potent for each desired
indication. The NDA, BLA or other relevant regulatory submission must also include significant information regarding the chemistry, manufacturing and
controls for the product.

The research, testing, manufacturing, labeling, approval, sale, marketing, and distribution of drug and biologic products are subject to extensive regulation
by  the  FDA  and  other  regulatory  authorities  in  the  United  States  and  other  countries,  and  such  regulations  differ  from  country  to  country.  We  are  not
permitted  to  market  our  drug  candidates  in  the  United  States  or  in  any  foreign  countries  until  they  receive  the  requisite  approval  from  the  applicable
regulatory authorities of such jurisdictions.

The FDA or any foreign regulatory bodies can delay, limit or deny approval of our drug candidates for many reasons, including:

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our inability to demonstrate to the satisfaction of the FDA or the applicable foreign regulatory body that any of our drug candidates is safe and
effective for the requested indication;

the  FDA’s  or  the  applicable  foreign  regulatory  agency’s  disagreement  with  our  trial  protocol  or  the  interpretation  of  data  from  preclinical
studies or clinical studies;

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

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

the FDA’s or the applicable foreign regulatory agency’s failure to approve the formulation, labeling or specifications of our current or future
drug candidates, including UBX1325;

the FDA’s or the applicable foreign regulatory agency’s failure to approve the manufacturing processes or facilities of third-party manufacturers
upon which we rely; or

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

Of the large number of biopharmaceutical and pharmaceutical products in development, only a small percentage successfully complete the FDA or other
regulatory approval processes and are commercialized.

Even if we eventually complete clinical testing and receive approval from the FDA or applicable foreign agencies for any of our drug candidates, the FDA
or the applicable foreign regulatory agency may grant approval contingent on the performance of costly additional clinical studies which may be required
after  approval.  The  FDA  or  the  applicable  foreign  regulatory  agency  also  may  approve  our  current  drug  candidates  for  limited  indications  or  narrower
patient populations than we originally requested, and the FDA, or applicable foreign regulatory agency,

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may  not  approve  our  drug  candidates  with  the  labeling  that  we  believe  is  necessary  or  desirable  for  the  successful  commercialization  of  such  drug
candidates.

Any delay in obtaining, or inability to obtain, applicable regulatory approval would delay or prevent commercialization of our drug candidates and would
materially adversely impact our business and prospects.

Even if our current drug candidates or any future drug candidates obtain regulatory approval, they may fail to achieve the broad degree of physician
and patient adoption and use necessary for commercial success.

Even  if  one  or  more  of  our  drug  candidates  receive  FDA  or  other  regulatory  approvals,  the  commercial  success  of  any  of  our  current  or  future  drug
candidates will depend significantly on the broad adoption and use of the resulting product by physicians and patients for approved indications. Our drug
candidates may not be commercially successful for a variety of reasons, including: competitive factors, pricing or physician preference, reimbursement by
insurers, the degree and rate of physician and patient adoption of our current or future drug candidates. If approved, the commercial success of our drug
candidates will depend on a number of factors, including:

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the clinical indications for which the product is approved and patient demand for approved products that treat those indications;

the safety and efficacy of our product as compared to other available therapies;

the availability of coverage and adequate reimbursement from managed care plans, insurers and other healthcare payors for any of our drug
candidates that may be approved;

acceptance by physicians, operators of clinics, and patients of the product as a safe and effective treatment;

physician and patient willingness to adopt a new therapy over other available therapies to treat approved indications;

overcoming any biases physicians or patients may have toward particular therapies for the treatment of approved indications;

proper training and administration of our drug candidates by physicians and medical staff;

public misperception regarding the use of our therapies, or public bias against “anti-aging” companies;

patient  satisfaction  with  the  results  and  administration  of  our  drug  candidates  and  overall  treatment  experience,  including,  for  example,  the
convenience of any dosing regimen;

the cost of treatment with our drug candidates in relation to alternative treatments and reimbursement levels, if any, and willingness to pay for
the product, if approved, on the part of insurance companies and other third-party payers, physicians and patients;

the willingness of patients to pay for certain of our products, if approved;

the revenue and profitability that our products may offer a physician as compared to alternative therapies;

the prevalence and severity of side effects;

limitations or warnings contained in the FDA-approved labeling for our products;

the willingness of physicians, operators of clinics and patients to utilize or adopt our products as a solution;

any FDA requirement to undertake a REMS;

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the effectiveness of our sales, marketing and distribution efforts;

adverse publicity about our products or favorable publicity about competitive products; and

potential product liability claims.

We cannot assure you that our current or future drug candidates, if approved, will achieve broad market acceptance among physicians and patients. Any
failure by our drug candidates that obtain regulatory approval to achieve market acceptance or commercial success would adversely affect our results of
operations.

We rely on third-party suppliers to manufacture supplies of our drug candidates and we intend to continue to rely on third parties to produce such
preclinical and clinical supplies as well as commercial supplies of any approved product. The loss of these suppliers, or their failure to comply with
applicable  regulatory  requirements  or  to  provide  us  with  sufficient  quantities  at  acceptable  quality  levels  or  prices,  or  at  all,  would  materially  and
adversely affect our business.

We do not have the infrastructure or capability internally to manufacture supplies of our drug candidates or the materials necessary to produce our drug
candidates for use in the conduct of our clinical studies, and we lack the internal resources and the capability to manufacture any of our drug candidates on
a  clinical  or  commercial  scale.  The  facilities  used  by  our  contract  manufacturers  to  manufacture  our  drug  candidates  are  subject  to  various  regulatory
requirements and may be subject to the inspection of the FDA or other regulatory authorities. We do not control the manufacturing process of, and are
completely  dependent  on,  our  contract  manufacturing  partners  for  compliance  with  the  regulatory  requirements,  known  as  cGMPs.  If  our  contract
manufacturers  cannot  successfully  manufacture  material  that  conforms  to  our  specifications  and  the  strict  regulatory  requirements  of  the  FDA  or
comparable  regulatory  authorities  in  foreign  jurisdictions,  we  may  not  be  able  to  rely  on  their  manufacturing  facilities  for  the  manufacture  or  our  drug
candidates. In addition, we have limited control over the ability of our contract manufacturers to maintain adequate quality control, quality assurance and
qualified personnel. If the FDA or a comparable foreign regulatory authority finds these facilities inadequate for the manufacture of our drug candidates or
if such facilities are subject to enforcement action in the future or are otherwise inadequate, we may need to find alternative manufacturing facilities, which
would significantly impact our ability to develop, obtain regulatory approval for or market our drug candidates.

We currently intend to supply all of our drug candidates in all territories for our planned clinical development programs. We currently rely on third parties
at key stages in our supply chain. For instance, the supply chains for our current drug candidates involve several manufacturers that specialize in specific
operations of the manufacturing process, specifically, raw materials manufacturing, drug substance manufacturing and drug product manufacturing. As a
result, the supply chain for the manufacturing of our drug candidates is complicated and we expect the logistical challenges associated with our supply
chain to grow more complex as our drug candidates progress through the clinical trial process. Some of these third parties may also be adversely impacted
by  COVID-19  or  other  unforeseen  events  and  public  health  emergencies.  For  example,  one  of  the  manufacturers  in  our  supply  chain  for  UBX0101
experienced  a  two-week  shutdown  in  April  2020  due  to  a  COVID-19  related  incident.  While  such  incident  did  not  impact  our  supply  of  UBX0101  for
clinical  studies  being  conducted  in  April  2020,  there  can  be  no  assurance  that  our  supply  chain  for  any  of  our  candidates  and  clinical  trials  will  not  be
disrupted in the future due to the COVID-19 pandemic.

We  do  not  have  any  control  over  the  process  or  timing  of  the  acquisition  or  manufacture  of  materials  by  our  manufacturers.  Further,  we  have  not  yet
engaged  any  manufacturers  for  the  commercial  supply  of  our  current  drug  candidates.  Although  we  intend  to  enter  into  such  agreements  prior  to
commercial launch of any of our drug candidates, we may be unable to enter into any such agreement or do so on commercially reasonable terms, which
could have a material adverse impact upon our business. We generally do not begin a preclinical study and we do not intend to initiate any clinical studies
unless we believe we have access to a sufficient supply of a drug candidate to complete such study or trial. In addition, any significant delay in, or quality
control problems with respect to, the supply of a drug candidate, or the raw material components thereof, for an ongoing study or trial could considerably
delay completion of our preclinical studies or future clinical studies, product testing and potential regulatory approval of our drug candidates.

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Moreover,  if  there  is  a  disruption  to  one  or  more  of  our  third-party  manufacturers’  or  suppliers’  relevant  operations,  or  if  we  are  unable  to  enter  into
arrangements for the commercial supply of our drug candidates, we will have no other means of producing our current drug candidates until they restore
the affected facilities or we or they procure alternative manufacturing facilities or sources of supply. Our ability to progress our preclinical and clinical
programs  could  be  materially  and  adversely  impacted  if  any  of  the  third-party  suppliers  upon  which  we  rely  were  to  experience  a  significant  business
challenge, disruption or failure due to issues such as financial difficulties or bankruptcy, issues relating to other customers such as regulatory or quality
compliance issues, or other financial, legal, regulatory or reputational issues.

Additionally, any damage to or destruction of our third-party manufacturers’ or suppliers’ facilities or equipment may significantly impair our ability to
manufacture our drug candidates on a timely basis.

In addition, to manufacture our current drug candidates in the quantities that we believe would be required to meet anticipated market demand, our third-
party manufacturers would likely need to increase manufacturing capacity and, in some cases, we would need to secure alternative sources of commercial
supply,  which  could  involve  significant  challenges  and  may  require  additional  regulatory  approvals.  In  addition,  the  development  of  commercial-scale
manufacturing  capabilities  may  require  us  and  our  third-party  manufacturers  to  invest  substantial  additional  funds  and  hire  and  retain  the  technical
personnel  who  have  the  necessary  manufacturing  experience.  Neither  we  nor  our  third-party  manufacturers  may  successfully  complete  any  required
increase to existing manufacturing capacity in a timely manner, or at all. If our manufacturers or we are unable to purchase the raw materials necessary for
the manufacture of our drug candidates on acceptable terms, at sufficient quality levels, or in adequate quantities, if at all, the commercial launch of our
current drug candidates or any future drug candidates would be delayed or there would be a shortage in supply, which would impair our ability to generate
revenues from the sale of such drug candidates, if approved.

If we fail to attract and retain key personnel, we may be unable to successfully develop our current drug candidates or any future drug candidates,
conduct our clinical studies and commercialize our current or any future drug candidates.

Our  success  depends  in  part  on  our  continued  ability  to  attract,  retain  and  motivate  highly  qualified  management  and  employees.  In  February  2022  we
announced a restructuring to advance corporate strategy and focus on key ophthalmology programs. As a result, additional unplanned loss of personnel,
may occur despite our efforts to retain management and employees. Continued disruption caused by the transition or by the loss of ongoing services of any
other members of our management or employees could delay or prevent the successful development of our ongoing programs, initiation or completion of
our planned clinical studies or the commercialization of our current drug candidates or any future drug candidates. Competition for qualified personnel in
the  biotechnology  and  pharmaceuticals  field  is  intense  due  to  the  limited  number  of  individuals  who  possess  the  skills  and  experience  required  by  our
industry, and we may not be able to adequately address attrition, including unplanned, attrition, and as a result, the timely completion of our clinical trials
could be jeopardized.

We  depend  on  third-party  suppliers  for  key  raw  materials  used  in  our  manufacturing  processes,  and  the  loss  of  these  third-party  suppliers  or  their
inability to supply us with adequate raw materials could harm our business.

We rely on third-party suppliers for the raw materials required for the production of our drug candidates. Our dependence on these third-party suppliers and
the challenges we may face in obtaining adequate supplies of raw materials involve several risks, including limited control over pricing, availability, and
quality and delivery schedules. As a small company, our negotiation leverage is limited, and we are likely to get lower priority than our competitors who
are larger than we are. We cannot be certain that our suppliers will continue to provide us with the quantities of these raw materials that we require or
satisfy our anticipated specifications and quality requirements. Any supply interruption in limited or sole sourced raw materials could materially harm our
ability to manufacture our drug candidates until a new source of supply, if any, could be identified and qualified. We may be unable to find a sufficient
alternative supply channel in a reasonable time or on commercially reasonable terms. Any performance failure on the part of our suppliers could delay the
development and potential commercialization of our drug candidates, including limiting supplies necessary for clinical studies and regulatory approvals,
which would have a material adverse effect on our business.

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We rely on third parties in the conduct of critical portions of our preclinical studies and intend to rely on third parties in the conduct of critical portions of
our future clinical studies. If these third parties do not successfully carry out their contractual duties, fail to comply with applicable regulatory requirements
or meet expected deadlines, we may be unable to obtain regulatory approval for our drug candidates. Some of these third parties may also be adversely
impacted by COVID-19 or other unforeseen events and public health emergencies.

We currently do not have the ability to independently conduct preclinical studies that comply with the regulatory requirements known as good laboratory
practice, or GLP, requirements. We also do not currently have the ability to independently conduct any clinical studies. The FDA and regulatory authorities
in  other  jurisdictions  require  us  to  comply  with  regulations  and  standards,  commonly  referred  to  as  good  clinical  practice,  or  GCP,  requirements  for
conducting, monitoring, recording and reporting the results of clinical studies, in order to ensure that the data and results are scientifically credible and
accurate and that the trial subjects are adequately informed of the potential risks of participating in clinical studies. We rely on medical institutions, clinical
investigators, contract laboratories and other third parties, such as CROs, to conduct GLP-compliant preclinical studies and GCP-compliant clinical studies
on our drug candidates properly and on time. While we have agreements governing their activities, we control only certain aspects of their activities and
have limited influence over their actual performance. The third parties with whom we contract for execution of our GLP-compliant preclinical studies and
our GCP-compliant clinical studies play a significant role in the conduct of these studies and trials and the subsequent collection and analysis of data. These
third  parties  are  not  our  employees  and,  except  for  restrictions  imposed  by  our  contracts  with  such  third  parties,  we  have  limited  ability  to  control  the
amount or timing of resources that they devote to our programs. Although we rely on these third parties to conduct our GLP-compliant preclinical studies
and  GCP-compliant  clinical  studies,  we  remain  responsible  for  ensuring  that  each  of  our  GLP  preclinical  studies  and  clinical  studies  is  conducted  in
accordance  with  its  investigational  plan  and  protocol  and  applicable  laws  and  regulations,  and  our  reliance  on  the  CROs  does  not  relieve  us  of  our
regulatory responsibilities.

Many of the third parties with whom we contract may also have relationships with other commercial entities, potentially including our competitors, for
whom  they  may  also  be  conducting  clinical  studies  or  other  drug  development  activities  that  could  harm  our  competitive  position.  If  the  third  parties
conducting our preclinical studies or our clinical studies do not adequately perform their contractual duties or obligations, experience significant business
challenges, disruptions or failures, do not meet expected deadlines, terminate their agreements with us or need to be replaced, or if the quality or accuracy
of the data they obtain is compromised due to their failure to adhere to our protocols or to GCPs, or for any other reason, we may need to enter into new
arrangements  with  alternative  third  parties.  This  could  be  difficult,  costly  or  impossible,  and  our  preclinical  studies  or  clinical  studies  may  need  to  be
extended, delayed, terminated or repeated. As a result, we may not be able to obtain regulatory approval in a timely fashion, or at all, for the applicable
drug candidate, our financial results and the commercial prospects for our drug candidates would be harmed, our costs could increase, and our ability to
generate revenues could be delayed.

We  face  significant  competition  in  an  environment  of  rapid  technological  and  scientific  change,  and  our  drug  candidates,  if  approved,  will  face
significant competition and our failure to effectively compete may prevent us from achieving significant market penetration. Most of our competitors
have significantly greater resources than we do, and we may not be able to successfully compete.

The  biotechnology  and  pharmaceutical  industries  in  particular  are  characterized  by  rapidly  advancing  technologies,  intense  competition  and  a  strong
emphasis  on  developing  proprietary  therapeutics.  Numerous  companies  are  engaged  in  the  development,  patenting,  manufacturing  and  marketing  of
healthcare  products  competitive  with  those  that  we  are  developing.  We  face  competition  from  a  number  of  sources,  such  as  pharmaceutical  companies,
generic  drug  companies,  biotechnology  companies  and  academic  and  research  institutions,  many  of  which  have  greater  financial  resources,  marketing
capabilities,  sales  forces,  manufacturing  capabilities,  research  and  development  capabilities,  clinical  study  expertise,  intellectual  property  portfolios,
experience in obtaining patents and regulatory approvals for drug candidates and other resources than we do. Some of the companies that offer competing
products also have a broad range of other product offerings, large direct sales forces and long-term customer relationships with our target physicians, which
could inhibit our market penetration efforts. Mergers and acquisitions in the pharmaceutical industry 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,  particularly  through
collaborative arrangements with large and established companies. These competitors also compete with us in

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recruiting and retaining qualified scientific and management personnel and establishing clinical study sites and patient registration for clinical studies, as
well as in acquiring technologies complementary to, or necessary for, our programs. In addition, certain of our drug candidates, if approved, may compete
with other products that treat diseases of aging, including over the counter, or OTC, treatments, for a share of some patients’ discretionary budgets and for
physicians’ attention within their clinical practices.

We are aware of other companies seeking to develop treatments to prevent or treat diseases of aging through various biological pathways. Within our lead
senolytic  program  in  ophthalmology  diseases,  our  drug  candidates  would  compete  against  current  therapies  from  a  wide  range  of  companies  and
technologies,  including  current  standard  of  care  treatments  such  as  anti-VEGF  antibodies  (bevacizumab,  ranibizumab,  aflibercept,  brolucizumab),
bispecific  antibodies  (faricimab),  intravitreal  steroid  (dexamethasone),  and  pan-retinal  photocoagulation  by  laser.  There  are  also  potentially  disease-
modifying therapeutics being developed by several pharmaceutical and biotechnology companies, including Roche/Genentech and Regeneron.

Further, we believe that potential competitors may be able to develop senolytic medicines utilizing well-established molecules and pathways, which could
enable the development of competitive drug candidates utilizing the same cellular senescence biological theories.

Certain alternative treatments offered by competitors may be available at lower prices and may offer greater efficacy or better safety profiles. Furthermore,
currently  approved  products  could  be  discovered  to  have  application  for  treatment  of  diseases  of  aging  generally,  which  could  give  such  products
significant  regulatory  and  market  timing  advantages  over  any  of  our  drug  candidates.  Our  competitors  also  may  obtain  FDA,  EMA  or  other  regulatory
approval for their products more rapidly than we may obtain approval for ours and may obtain orphan product exclusivity from the FDA for indications our
drug candidates are targeting, which could result in our competitors establishing a strong market position before we are able to enter the market. Newly
developed systemic or non-systemic treatments that replace existing therapies that currently are only utilized in patients suffering from severe disease may
also  have  lessened  side  effects  or  reduced  prices  compared  to  current  therapies,  which  make  them  more  attractive  for  patients  suffering  from  mild  to
moderate disease. Even if a generic or OTC product is less effective than our drug candidates, it may be more quickly adopted by physicians and patients
than our competing drug candidates based upon cost or convenience.

The  successful  commercialization  of  our  drug  candidates  will  depend  in  part  on  the  extent  to  which  governmental  authorities  and  health  insurers
establish adequate coverage, reimbursement levels and pricing policies. Failure to obtain or maintain coverage and adequate reimbursement for our
drug candidates, if approved, could limit our ability to market those products and decrease our ability to generate revenue.

The  availability  and  adequacy  of  coverage  and  reimbursement  by  governmental  healthcare  programs  such  as  Medicare  and  Medicaid,  private  health
insurers and other third-party payors are essential for most patients to be able to afford prescription medications such as our drug candidates, assuming
FDA approval. Our ability to achieve acceptable levels of coverage and reimbursement for products by governmental authorities, private health insurers
and other organizations will have an effect on our ability to successfully commercialize our drug candidates. Assuming we obtain coverage for our drug
candidates  by  a  third-party  payor,  the  resulting  reimbursement  payment  rates  may  not  be  adequate  or  may  require  co-payments  that  patients  find
unacceptably high. We cannot be sure that coverage and reimbursement in the United States, the European Union or elsewhere will be available for our
drug candidates or any product that we may develop, and any reimbursement that may become available may be decreased or eliminated in the future.

Third-party  payors  increasingly  are  challenging  prices  charged  for  pharmaceutical  products  and  services,  and  many  third-party  payors  may  refuse  to
provide coverage and reimbursement for particular drugs or biologics when an equivalent generic drug, biosimilar or a less expensive therapy is available.
It  is  possible  that  a  third-party  payor  may  consider  our  drug  candidates  as  substitutable  and  only  offer  to  reimburse  patients  for  the  cost  of  the  less
expensive product. Even if we show improved efficacy or improved convenience of administration with our drug candidates, pricing of existing third-party
therapeutics may limit the amount we will be able to charge for our drug candidates. These payors may deny or revoke the reimbursement status of a given
product or establish prices for new or existing marketed products at levels that are too low to enable us to realize an appropriate return on our investment in
our drug candidates. If reimbursement is not available or is available only at limited levels, we may

53

 
not  be  able  to  successfully  commercialize  our  drug  candidates  and  may  not  be  able  to  obtain  a  satisfactory  financial  return  on  our  investment  in  the
development of drug candidates.

There is significant uncertainty related to the insurance coverage and reimbursement of newly approved products. In the United States, third-party payors,
including private and governmental payors, such as the Medicare and Medicaid programs, play an important role in determining the extent to which new
drugs and biologics will be covered. The Medicare and Medicaid programs increasingly are used as models in the United States for how private payors and
other governmental payors develop their coverage and reimbursement policies for drugs and biologics. Some third-party payors may require pre-approval
of coverage for new or innovative devices or drug therapies before they will reimburse healthcare providers who use such therapies. We cannot predict at
this time what third-party payors will decide with respect to the coverage and reimbursement for our drug candidates.

No  uniform  policy  for  coverage  and  reimbursement  for  products  exists  among  third-party  payors  in  the  United  States.  Therefore,  coverage  and
reimbursement for products can differ significantly from payor to payor. As a result, the coverage determination process is often a time-consuming and
costly process that will require us to provide scientific and clinical support for the use of our drug candidates to each payor separately, with no assurance
that  coverage  and  adequate  reimbursement  will  be  applied  consistently  or  obtained  in  the  first  instance.  Furthermore,  rules  and  regulations  regarding
reimbursement change frequently, in some cases on short notice, and we believe that changes in these rules and regulations are likely.

Outside  the  United  States,  international  operations  are  generally  subject  to  extensive  governmental  price  controls  and  other  market  regulations,  and  we
believe the increasing emphasis on cost-containment initiatives in Europe and other countries have and will continue to put pressure on the pricing and
usage of our drug candidates. In many countries, the prices of medical products are subject to varying price control mechanisms as part of national health
systems. Other countries allow companies to fix their own prices for medical products but monitor and control company profits.

Additional  foreign  price  controls  or  other  changes  in  pricing  regulation  could  restrict  the  amount  that  we  are  able  to  charge  for  our  drug  candidates.
Accordingly, in markets outside the United States, the reimbursement for our drug candidates may be reduced compared with the United States and may be
insufficient to generate commercially reasonable revenue and profits.

Moreover,  increasing  efforts  by  governmental  and  third-party  payors  in  the  United  States  and  abroad  to  cap  or  reduce  healthcare  costs  may  cause  such
organizations to limit both coverage and the level of reimbursement for newly approved products and, as a result, they may not cover or provide adequate
payment for our drug candidates. We expect to experience pricing pressures in connection with the sale of our drug candidates due to the trend toward
managed  health  care,  the  increasing  influence  of  health  maintenance  organizations  and  additional  legislative  changes.  The  downward  pressure  on
healthcare  costs  in  general,  particularly  prescription  drugs  and  biologics  and  surgical  procedures  and  other  treatments,  has  become  intense.  As  a  result,
increasingly high barriers are being erected to the entry of new products.

We currently have no sales organization. If we are unable to establish sales capabilities on our own or through third parties, we may not be able to
market and sell our drug candidates effectively in the U.S. and foreign jurisdictions, if approved, or generate product revenue.

We currently do not have a marketing or sales organization. In order to commercialize our drug candidates in the United States and foreign jurisdictions, we
must  build  our  marketing,  sales,  distribution,  managerial  and  other  non-technical  capabilities  or  make  arrangements  with  third  parties  to  perform  these
services, and we may not be successful in doing so. If any of our drug candidates receive regulatory approval, we expect to establish a sales organization
with technical expertise and supporting distribution capabilities to commercialize each such drug candidate, which will be expensive and time consuming.
We  have  no  prior  experience  in  the  marketing,  sale  and  distribution  of  pharmaceutical  products  and  there  are  significant  risks  involved  in  building  and
managing a sales organization, including our ability to hire, retain, and incentivize qualified individuals, generate sufficient sales leads, provide adequate
training  to  sales  and  marketing  personnel,  and  effectively  manage  a  geographically  dispersed  sales  and  marketing  team.  Any  failure  or  delay  in  the
development of our internal sales, marketing and distribution capabilities would adversely impact the commercialization of these products. We may choose
to

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collaborate  with  third  parties  that  have  direct  sales  forces  and  established  distribution  systems,  either  to  augment  our  own  sales  force  and  distribution
systems or in lieu of our own sales force and distribution systems. If we are unable to enter into such arrangements on acceptable terms or at all, we may
not  be  able  to  successfully  commercialize  our  drug  candidates.  If  we  are  not  successful  in  commercializing  our  drug  candidates  or  any  future  drug
candidates, either on our own or through arrangements with one or more third parties, we may not be able to generate any future product revenue and we
would incur significant additional losses.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our current
or future drug candidates.

We face an inherent risk of product liability as a result of the clinical testing of our drug candidates and will face an even greater risk if we commercialize
any products. For example, we may be sued if any product we develop allegedly causes injury or is found to be otherwise unsuitable during product testing,
manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, and a failure to
warn of dangers inherent in the product, negligence, strict liability, and a breach of warranty. Claims could also be asserted under state consumer protection
acts.  If  we  cannot  successfully  defend  ourselves  against  product  liability  claims,  we  may  incur  substantial  liabilities  or  be  required  to  limit
commercialization of our drug candidates.

Even a successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims
may result in:

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•

•

decreased demand for our current or future drug candidates;

injury to our reputation;

withdrawal of clinical study participants;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

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

loss of revenue; and

the inability to commercialize our current or any future drug candidates.

Our inability to obtain and maintain sufficient product liability insurance at an acceptable cost and scope of coverage to protect against potential product
liability claims could prevent or inhibit the commercialization of our current or any future drug candidates we develop. We currently carry product liability
insurance covering our clinical studies. Although we maintain such insurance, any claim that may be brought against us could result in a court judgment or
settlement in an amount that is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. Our insurance
policies also have various exclusions and deductibles, and we may be subject to a product liability claim for which we have no coverage. We will have to
pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we
may not have, or be able to obtain, sufficient funds to pay such amounts. Moreover, in the future, we may not be able to maintain insurance coverage at a
reasonable cost or in sufficient amounts to protect us against losses. If and when we obtain approval for marketing any of our drug candidates, we intend to
expand our insurance coverage to include the sale of such drug candidate; however, we may be unable to obtain this liability insurance on commercially
reasonable terms or at all.

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Our existing collaborations as well as additional collaboration arrangements that we may enter into in the future may not be successful, which could
adversely affect our ability to develop and commercialize our drug candidates.

We utilize external collaborations and currently maintain several active early-stage research and discovery focused collaborations. In the future, we may
seek additional collaboration arrangements for the commercialization, or potentially for the development, of certain of our drug candidates depending on
the merits of retaining commercialization rights for ourselves as compared to entering into collaboration arrangements. To the extent that we decide to enter
into additional collaboration agreements in the future, we may face significant competition in seeking appropriate collaborators. Moreover, collaboration
arrangements are complex and time-consuming to negotiate, document, implement and maintain and challenging to manage. We may not be successful in
our  efforts  to  prudently  manage  our  existing  collaborations  or  to  enter  new  ones  should  we  chose  to  do  so.  The  terms  of  new  collaborations,  or  other
arrangements that we may establish may not be favorable to us.

The success of our collaboration arrangements will depend heavily on the efforts and activities of our collaborators and partners. Collaborations are subject
to numerous risks, which may include risks that:

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•

collaborators and partners have significant discretion in determining the efforts and resources that they will apply to collaborations and they
may not devote the level of effort or resources we expect;

collaborators may not pursue development and commercialization of our drug candidates or may elect not to continue or renew development or
commercialization programs based on clinical study results, changes in their strategic focus due to their acquisition of competitive products or
their internal development of competitive products, availability of funding or other external factors, such as a business combination that diverts
resources or creates competing priorities;

collaborators  may  delay  clinical  studies,  provide  insufficient  funding  for  a  clinical  study  program,  stop  a  clinical  study,  abandon  a  drug
candidate, repeat or conduct new clinical studies or require a new formulation of a drug candidate for clinical testing;

collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our products or drug
candidates;

a  collaborator  with  marketing,  manufacturing,  and  distribution  rights  to  one  or  more  products  may  not  commit  sufficient  resources  to  or
otherwise not perform satisfactorily in carrying out these activities;

we could grant exclusive rights to our collaborators that would prevent us from collaborating with others;

collaborators  may  not  properly  maintain  or  defend  our  intellectual  property  rights  or  may  use  our  intellectual  property  or  proprietary
information in a way that gives rise to actual or threatened litigation that could jeopardize or invalidate our intellectual property or proprietary
information or expose us to potential liability;

disputes may arise between us and a collaborator that cause the delay or termination of the research, development or commercialization of our
current or future drug candidates or that result in costly litigation or arbitration that diverts management attention and resources;

collaborations  may  be  terminated,  resulting  in  a  need  for  additional  capital  to  pursue  further  development  or  commercialization  of  the
applicable current or future drug candidates;

collaborators may own or co-own intellectual property covering products that results from our collaborating with them, and in such cases, we
would not have the exclusive right to develop or commercialize such intellectual property;

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•

•

•

disputes may arise with respect to the ownership of any intellectual property developed pursuant to our collaborations;

a collaborator’s sales and marketing activities or other operations may not be in compliance with applicable laws resulting in civil or criminal
proceedings; and

collaborators may be adversely impacted by COVID-19 or other unforeseen events and public health emergencies.

Risks Related to Intellectual Property

Our senolytic medicine platform and any future products that we commercialize could be alleged to infringe patent rights and other proprietary rights
of third parties, which may require costly litigation and, if we are not successful, could cause us to pay substantial damages and/or limit our ability to
commercialize our products.

Our  commercial  success  depends  on  our  ability  to  develop,  manufacture  and  market  our  senolytic  medicines  and  future  drug  candidates  and  use  our
proprietary technology without infringing the patents and other proprietary rights of third parties. Intellectual property disputes can be costly to defend and
may cause our business, operating results and financial condition to suffer. We operate in an industry with extensive intellectual property litigation. As the
biopharmaceutical and pharmaceutical industries expand and more patents are issued, the risk increases that there may be patents issued to third parties that
relate to our products and technology of which we are not aware or that we may need to challenge to continue our operations as currently contemplated.

Whether merited or not, we may face allegations that we have infringed the trademarks, copyrights, patents and other intellectual property rights of third
parties, including patents held by our competitors or by non-practicing entities. We may also face allegations that our employees have misappropriated the
intellectual property rights of their former employers or other third parties.

Litigation may make it necessary to defend ourselves by determining the scope, enforceability, and validity of third-party proprietary rights, or to establish
our proprietary rights. Regardless of whether claims that we are infringing patents or other intellectual property rights have merit, the claims can be time
consuming, divert management attention and financial resources and are costly to evaluate and defend. Results of any such litigation are difficult to predict
and may require us to stop treating certain conditions, obtain licenses or modify our products and features while we develop non-infringing substitutes, or
may  result  in  significant  settlement  costs.  For  example,  litigation  can  involve  substantial  damages  for  infringement  (and  if  the  court  finds  that  the
infringement was willful, we could be ordered to pay treble damages and the patent owner’s attorneys’ fees), and the court could prohibit us from selling or
licensing our products unless the third-party licenses rights to us, which it is not required to do at a commercially reasonable price or at all. If a license is
available from a third party, we may have to pay substantial royalties, upfront fees or grant cross-licenses to intellectual property rights for our products.
We may also have to redesign our products so they do not infringe third-party intellectual property rights, which may not be possible at all or may require
substantial monetary expenditures and time, during which our products may not be available for manufacture, use, or sale.

In  addition,  patent  applications  in  the  United States  and  many  international  jurisdictions  are  typically  not  published  until  18  months  after  the  filing  of
certain  priority  documents  (or,  in  some  cases,  are  not  published  until  they  issue  as  patents)  and  publications  in  the  scientific  literature  often  lag  behind
actual discoveries. Thus, we cannot be certain that others have not filed patent applications or made public disclosures relating to our technology or our
contemplated technology. A third party may have filed, and may in the future file, patent applications covering our products or technology similar to ours.
Any  such  patent  application  may  have  priority  over  our  patent  applications  or  patents,  which  could  further  require  us  to  obtain  rights  to  issued  patents
covering such technologies. If another party has filed a U.S. patent application on inventions similar to ours, depending on whether the timing of the filing
date falls under certain patent laws, we may have to participate in a priority contest (such as an interference proceeding) declared by the U.S. Patent and
Trademark Office, to determine priority of invention in the United States. The costs of patent and other proceedings could be substantial, and it is possible
that such efforts would be unsuccessful if it is

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determined that the other party had independently arrived at the same or similar invention prior to our own invention, resulting in a loss of our U.S. patent
position with respect to such inventions

From time to time, we may be subject to legal proceedings and claims in the ordinary course of business with respect to intellectual property. Although we
are not currently subject to any claims from third parties asserting infringement of their intellectual property rights, in the future, we may receive claims
from third parties asserting infringement of their intellectual property rights. Future litigation may be necessary to establish our intellectual property rights
or  to  defend  ourselves  by  determining  the  scope,  enforceability  and  validity  of  third-party  intellectual  property  rights.  There  can  be  no  assurance  with
respect to the outcome of any current or future litigation brought by or against us, and the outcome of any such litigation could have a material adverse
impact on our business, operating results and financial condition. Litigation is inherently unpredictable and outcomes are uncertain. Further, as the costs
and outcome of these types of claims and proceedings can vary significantly, it is difficult to estimate potential losses that may occur. Accordingly, we are
unable at this time to estimate the effects of these potential future lawsuits on our financial condition, operations or cash flows.

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater
resources.  Even  if  resolved  in  our  favor,  litigation  or  other  legal  proceedings  relating  to  intellectual  property  claims  may  cause  us  to  incur  significant
expenses and could distract our technical and management personnel from their normal responsibilities. 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 material adverse effect on the price of our common stock. Finally, any uncertainties resulting from the initiation and continuation of any
litigation could have a material adverse effect on our ability to raise the funds necessary to continue our operations.

If  we  are  unable  to  obtain,  maintain  and  enforce  intellectual  property  protection  directed  to  our  senolytic  medicine  platform  and  any  future
technologies that we develop, others may be able to make, use, or sell products substantially the same as ours, which could adversely affect our ability
to compete in the market.

As of March 1, 2022, we own, co-own, or have an exclusive license in certain fields of use to more than 150 patents and pending applications in the United
States and foreign jurisdictions. This portfolio includes 47 issued and allowed U.S. patents and applications and 38 granted and allowed foreign patents and
applications, respectively. A composition of matter patent filing claiming the specific chemical structure of UBX1325 was issued in the U.S. on April 20,
2021, which will extend our loss of exclusivity on this molecule to 2039, not including any patent term adjustment or patent term extensions to which it
may be entitled.

We have not pursued or maintained, and may not pursue or maintain in the future, patent protection for our products in every country or territory in which
we may sell our products. In addition, we cannot be sure that any of our pending patent applications or pending trademark applications will issue or that, if
issued,  they  will  issue  in  a  form  that  will  be  advantageous  to  us.  The  U.S.  Patent  and  Trademark  Office,  or  the  USPTO,  international  patent  offices  or
judicial bodies may deny or significantly narrow claims made under our patent applications and our issued patents may be successfully challenged, may be
designed around, or may otherwise be of insufficient scope to provide us with protection for our commercial products. Further, the USPTO, international
trademark offices or judicial bodies may deny our trademark applications and, even if published or registered, these trademarks may not effectively protect
our brand and goodwill. Like patents, trademarks also may be successfully opposed or challenged.

We cannot be certain that the steps we have taken will prevent unauthorized use or unauthorized reverse engineering of our technology. Moreover, third
parties may independently develop technologies that are competitive with ours and such competitive technologies may or may not infringe our intellectual
property.  The  enforcement  of  our  intellectual  property  rights  also  depends  on  the  success  of  our  legal  actions  against  these  infringers  in  the  respective
country  or  forum,  but  these  actions  may  not  be  successful.  As  with  all  granted  intellectual  property,  such  intellectual  property  may  be  challenged,
invalidated or circumvented, may not provide specific protection and/or may not prove to be enforceable in actions against specific alleged infringers.

The market for biopharmaceuticals, pharmaceuticals, and treatments for diseases of aging is highly competitive and subject to rapid technological change.
Our success depends, in part, upon our ability to maintain a competitive position in the development and protection of technologies and products for use in
these fields and upon our ability

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to  obtain,  maintain  and  enforce  our  intellectual  property  rights  in  connection  therewith.  We  seek  to  obtain  and  maintain  patents  and  other  intellectual
property rights to restrict the ability of others to market products that misappropriate our technology and/or infringe our intellectual property to unfairly and
illegally compete with our products. If we are unable to protect our intellectual property and proprietary rights, our competitive position and our business
could  be  harmed,  as  third  parties  may  be  able  to  make,  use,  or  sell  products  that  are  substantially  the  same  as  ours  without  incurring  the  sizeable
development and licensing costs that we have incurred, which would adversely affect our ability to compete in the market.

We  use  a  combination  of  patents,  trademarks,  know-how,  confidentiality  procedures,  and  contractual  provisions  to  protect  our  proprietary  technology.
However, these protections may not be adequate and may not provide us with any competitive advantage. For example, patents may not issue from any of
our currently pending or any future patent applications, and our issued patents and any future patents that may issue may not survive legal challenges to
their scope, validity or enforceability, or provide significant protection for us.

If we or one of our current or future collaborators were to initiate legal proceedings against a third party to enforce a patent covering one of our current
drug  candidates  or  future  drug  candidates,  the  defendant  could  counterclaim  that  our  patent  is  invalid  and/or  unenforceable.  In  patent  litigation  in  the
United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace.

Grounds  for  a  validity  challenge  could  be  an  alleged  failure  to  meet  any  of  several  statutory  requirements,  including  lack  of  novelty,  obviousness  or
nonenablement. Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld relevant
information from the USPTO, or made a misleading statement, during prosecution. Third parties may also raise similar claims before the USPTO, even
outside the context of litigation. The outcome following legal assertions of invalidity and unenforceability is unpredictable.

With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art, of which we and the patent examiner were
unaware  during  prosecution.  If  a  defendant  were  to  prevail  on  a  legal  assertion  of  invalidity  and/or  unenforceability,  we  would  lose  at  least  part,  and
perhaps all, of the patent protection on our drug candidates. Such a loss of patent protection would have a material adverse impact on our business.

Even if our patents are determined by a court to be valid and enforceable, they may not be interpreted sufficiently broadly to prevent others from marketing
products similar to ours or designing around our patents. For example, third parties may be able to make products that are similar to ours but that are not
covered  by  the  claims  of  our  patents.  Third  parties  may  assert  that  we  or  our  licensors  were  not  the  first  to  make  the  inventions  covered  by  our  issued
patents  or  pending  patent  applications.  The  claims  of  our  issued  patents  or  patent  applications  when  issued  may  not  cover  our  proposed  commercial
technologies or the future products that we develop. We may not have freedom to commercialize unimpeded by the patent rights of others. Third parties
may have dominating, blocking, or other patents relevant to our technology of which we are not aware. There may be prior public disclosures or art that
could be deemed to invalidate one or more of our patent claims. Further, we may not develop additional proprietary technologies in the future, and, if we
do, they may not be patentable.

Patent law can be highly uncertain and involve complex legal and factual questions for which important principles remain unresolved. In the United States
and  in  many  international  jurisdictions,  policy  regarding  the  breadth  of  claims  allowed  in  patents  can  be  inconsistent.  The  U.S.  Supreme  Court  and  the
Court of Appeals for the Federal Circuit have made, and will likely continue to make, changes in how the patent laws of the United States are interpreted.
Similarly, international courts have made, and will likely continue to make, changes in how the patent laws in their respective jurisdictions are interpreted.
We cannot predict future changes in the interpretation of patent laws or changes to patent laws that might be enacted into law by U.S. and international
legislative  bodies.  Those  changes  may  materially  affect  our  patents,  our  ability  to  obtain  patents  or  the  patents  and  patent  applications  of  our  licensors.
Patent  reform  legislation  in  the  United States  could  increase  the  uncertainties  and  costs  surrounding  the  prosecution  of  our  patent  applications  and  the
enforcement or defense of our issued patents. For example, on September 16, 2011, the Leahy-Smith America Invents Act, or Leahy-Smith Act, was signed
into law. The Leahy-Smith Act included a number of significant changes to U.S. patent law. These include provisions that affect the way patent applications
are prosecuted, redefine prior art, may affect patent litigation, and switch the U.S. patent system from a “first-to-invent” system to a “first-to-file” system.
Under a “first-to-file” system, assuming the other

59

 
requirements for patentability are met, the first inventor to file a patent application generally will be entitled to the patent on an invention regardless of
whether  another  inventor  had  made  the  invention  earlier.  The  U.S.  Patent  and  Trademark  Office  recently  developed  new  regulations  and  procedures  to
govern administration of the Leahy-Smith Act, and many of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular,
the first-to-file provisions, only became effective on March 16, 2013. The Leahy-Smith Act and its implementation could increase the uncertainties and
costs surrounding the prosecution of our patent applications and the enforcement or defense of our issued patents, which could have a material adverse
effect on our business and financial condition.

In addition, we have a number of international patents and patent applications and expect to continue to pursue patent protection in many of the significant
markets in which we intend to do business. The laws of some international jurisdictions may not protect intellectual property rights to the same extent as
laws in the United States, and many companies have encountered significant difficulties in obtaining, protecting, and defending such rights in international
jurisdictions.  If  we  encounter  such  difficulties  or  we  are  otherwise  precluded  from  effectively  protecting  our  intellectual  property  rights  in  international
jurisdictions, our business prospects could be substantially harmed.

Varying filing dates in international countries may also permit intervening third parties to allege priority to certain technology.

Patent  terms  may  be  shortened  or  lengthened  by,  for  example,  terminal  disclaimers,  patent  term  adjustments,  supplemental  protection  certificates,  and
patent term extensions. Patent term extensions and supplemental protection certificates, and the like, may be impacted by the regulatory process and may
not significantly lengthen the patent term. Non-payment or delay in payment of patent fees or annuities, delay in patent filings or delay in extension filing
(including any patent term extension or adjustment filing), whether intentional or unintentional, may also result in the loss of patent rights important to our
business. Certain countries have compulsory licensing laws under which a patent owner may be compelled to grant licenses to other parties. In addition,
many countries limit the enforceability of patents against other parties, including government agencies or government contractors. In these countries, the
patent owner may have limited remedies, which could materially diminish the value of any patents.

In addition to the protection afforded by patents, we rely on confidentiality agreements to protect confidential information and proprietary know-how that is
not patentable or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our drug candidate discovery and
development processes that involve proprietary know-how, information or technology that is not covered by patents. We seek to protect our proprietary
technology  and  processes,  in  part,  by  entering  into  confidentiality  agreements  with  our  employees,  consultants,  scientific  advisors,  and  contractors.  We
cannot guarantee that we have entered into such agreements with each party that may have or have had access to our confidential information or proprietary
technology and processes. We also seek to preserve the integrity and confidentiality of our data and other confidential information by maintaining physical
security  of  our  premises  and  physical  and  electronic  security  of  our  information  technology  systems.  While  we  have  confidence  in  these  individuals,
organizations and systems, agreements or security measures may be breached and detecting the disclosure or misappropriation of confidential information
and  enforcing  a  claim  that  a  party  illegally  disclosed  or  misappropriated  confidential  information  is  difficult,  expensive  and  time-consuming,  and  the
outcome is unpredictable. Further, we may not be able to obtain adequate remedies for any breach. In addition, our confidential information may otherwise
become known or be independently discovered by competitors, in which case we would have no right to prevent them, or those to whom they communicate
it, from using that technology or information to compete with us. We may in the future rely on trade secret protection, which would be subject to the risks
identified above with respect to confidential information.

Monitoring unauthorized use of our intellectual property is difficult and costly. From time to time, we review our competitors’ products, and may in the
future seek to enforce our patents or other rights against potential infringement. However, the steps we have taken to protect our proprietary rights may not
be adequate to prevent misappropriation of our intellectual property. We may not be able to detect unauthorized use of, or take appropriate steps to enforce,
our intellectual property rights. Our competitors may also independently develop similar technology. Any inability to meaningfully protect our intellectual
property could result in competitors offering products that incorporate our product or service features, which could reduce demand for our products. In
addition, we may need to defend our patents from third-party challenges, such as (but not limited to) interferences, derivation

60

 
proceedings,  reexamination  proceedings,  post-grant  review,  inter  partes  review,  third-party  submissions,  oppositions,  nullity  actions  or  other  patent
proceedings. We may need to initiate infringement claims or litigation.

Adverse  proceedings  such  as  litigation  can  be  expensive,  time  consuming  and  may  divert  the  efforts  of  our  technical  and  managerial  personnel,  which
could in turn harm our business, whether or not we receive a determination favorable to us. In addition, in an infringement proceeding, a court or other
judicial body may decide that the patent we seek to enforce is invalid or unenforceable, or may refuse to stop the other party from using the technology at
issue on the grounds that the patent in question does not cover the technology in question. An adverse result in any litigation could put one or more of our
patents  at  risk  of  being  invalidated  or  interpreted  narrowly.  Some  of  our  competitors  may  be  able  to  devote  significantly  more  resources  to  intellectual
property  litigation  and  may  have  significantly  broader  patent  portfolios  to  assert  against  us  if  we  assert  our  rights  against  them.  Further,  because  of  the
substantial discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be disclosed
or otherwise compromised during litigation.

We  may  not  be  able  to  correctly  estimate  or  control  our  future  operating  expenses  in  relation  to  obtaining  intellectual  property,  enforcing  intellectual
property and/or defending intellectual property, which could affect operating expenses. Our operating expenses may fluctuate significantly in the future as a
result  of  a  variety  of  factors,  including  the  costs  of  preparing,  filing,  prosecuting,  defending,  and  enforcing  patent  and  trademark  claims  and  other
intellectual property-related costs, including adverse proceedings (such as litigation) costs.

Our intellectual property agreements with third parties may be subject to disagreements over contract interpretation, which could narrow the scope of
our rights to the relevant intellectual property or technology or increase our financial or other obligations to our licensors.

Certain  provisions  in  our  intellectual  property  agreements  may  be  susceptible  to  multiple  interpretations.  The  resolution  of  any  contract  interpretation
disagreement that may arise could affect the scope of our rights to the relevant intellectual property or technology, or affect 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.

In addition, while it is our policy to require our employees and contractors who may be involved in the conception or development of intellectual property
to  execute  agreements  assigning  such  intellectual  property  to  us,  we  may  be  unsuccessful  in  executing  such  an  agreement  with  each  party  who  in  fact
conceives or develops intellectual property that we regard as our own. Our assignment agreements may not be self-executing or may be breached, and we
may  be  forced  to  bring  claims  against  third  parties,  or  defend  claims  they  may  bring  against  us,  to  determine  the  ownership  of  what  we  regard  as  our
intellectual property.

If  we  are  unable  to  protect  the  confidentiality  of  our  proprietary  information  and  know-how,  the  value  of  our  technology  and  products  could  be
adversely affected.

We  may  not  be  able  to  protect  our  proprietary  information  and  technology  adequately.  Although  we  use  reasonable  efforts  to  protect  our  proprietary
information, technology, and know-how, our employees, consultants, contractors and outside scientific advisors may unintentionally or willfully disclose
our information to competitors. Enforcing a claim that a third party illegally obtained and is using any of our proprietary information, technology or know-
how is expensive and time consuming, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect
proprietary information, technology, and know-how. We rely, in part, on non-disclosure and confidentiality agreements with our employees, consultants and
other  parties  to  protect  our  proprietary  information,  technology,  and  know-how.  These  agreements  may  be  breached  and  we  may  not  have  adequate
remedies for any breach. Moreover, others may independently develop similar or equivalent proprietary information, and third parties may otherwise gain
access to our proprietary knowledge.

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Risks Related to Government Regulation

Even if we obtain regulatory approval for a drug candidate, our products will remain subject to regulatory scrutiny.

If our drug candidates are approved, they will be subject to ongoing regulatory requirements for manufacturing, labeling, packaging, storage, advertising,
promotion, sampling, record-keeping, conduct of post-marketing studies, and submission of safety, efficacy, and other post-market information, including
both federal and state requirements in the United States and requirements of comparable foreign regulatory authorities.

Manufacturers  and  manufacturers’  facilities  are  required  to  comply  with  extensive  FDA  and  comparable  foreign  regulatory  authority  requirements,
including ensuring that quality control and manufacturing procedures conform to cGMP regulations. As such, we and our contract manufacturers will be
subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in any approved marketing application.
Accordingly,  we  and  others  with  whom  we  work  must  continue  to  expend  time,  money,  and  effort  in  all  areas  of  regulatory  compliance,  including
manufacturing, production, and quality control.

We  will  have  to  comply  with  requirements  concerning  advertising  and  promotion  for  our  products.  Promotional  communications  with  respect  to
prescription drugs and biologics are subject to a variety of legal and regulatory restrictions and must be consistent with the information in the product’s
approved  label.  As  such,  we  may  not  promote  our  products  for  indications  or  uses  for  which  they  do  not  have  approval.  The  holder  of  an  approved
application  must  submit  new  or  supplemental  applications  and  obtain  approval  for  certain  changes  to  the  approved  product,  product  labeling,  or
manufacturing process. We could also be asked to conduct post-marketing clinical studies to verify the safety and efficacy of our products in general or in
specific patient subsets. An unsuccessful post-marketing study or failure to complete such a study could result in the withdrawal of marketing approval.

If a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or problems
with  the  facility  where  the  product  is  manufactured,  or  disagrees  with  the  promotion,  marketing  or  labeling  of  a  product,  such  regulatory  agency  may
impose restrictions on that product or us, including requiring withdrawal of the product from the market. If we fail to comply with applicable regulatory
requirements, a regulatory agency or enforcement authority may, among other things:

•

•

•

•

•

•

•

issue warning letters;

impose civil or criminal penalties;

suspend or withdraw regulatory approval;

suspend any of our clinical studies;

refuse to approve pending applications or supplements to approved applications submitted by us;

impose restrictions on our operations, including closing our contract manufacturers’ facilities; or

seize or detain products or require a product recall.

Any  government  investigation  of  alleged  violations  of  law  could  require  us  to  expend  significant  time  and  resources  in  response  and  could  generate
negative publicity. Any failure to comply with ongoing regulatory requirements may significantly and adversely affect our ability to commercialize and
generate revenue from our products. If regulatory sanctions are applied or if regulatory approval is withdrawn, the value of our company and our operating
results will be adversely affected.

Moreover,  the  policies  of  the  FDA  and  of  other  regulatory  authorities  may  change  and  additional  government  regulations  may  be  enacted  that  could
prevent, limit or delay regulatory approval of our drug candidates. We cannot

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predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative or executive action, either in the
United States or abroad.

If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain
regulatory compliance, we may be subject to enforcement action, and we may not achieve or sustain profitability.

If any of our small molecule drug candidates obtain regulatory approval, additional competitors could enter the market with generic versions of such
drugs, which may result in a material decline in sales of affected products.

Under  the  Drug  Price  Competition  and  Patent  Term  Restoration  Act  of  1984,  or  the  Hatch-Waxman  Act,  a  pharmaceutical  manufacturer  may  file  an
abbreviated new drug application, or ANDA, seeking approval of a generic version of an approved, small molecule innovator product. Under the Hatch-
Waxman Act, a manufacturer may also submit a new drug application, or NDA, under section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act that
references  the  FDA’s  prior  approval  of  the  small  molecule  innovator  product.  A  505(b)(2)  NDA  product  may  be  for  a  new  or  improved  version  of  the
original innovator product. The Hatch-Waxman Act also provides for certain periods of regulatory exclusivity, which preclude FDA approval (or in some
circumstances, FDA filing and review) of an ANDA or 505(b)(2) NDA. In addition to the benefits of regulatory exclusivity, an innovator NDA holder may
have  patents  claiming  the  active  ingredient,  product  formulation  or  an  approved  use  of  the  drug,  which  would  be  listed  with  the  product  in  the  FDA
publication, “Approved Drug Products with Therapeutic Equivalence Evaluations,” known as the Orange Book. If there are patents listed in the Orange
Book for a product, a generic or 505(b)(2) applicant that seeks to market its product before expiration of the patents must include in their applications what
is  known  as  a  “Paragraph  IV”  certification,  challenging  the  validity  or  enforceability  of,  or  claiming  non-infringement  of,  the  listed  patent  or  patents.
Notice of the certification must be given to the patent owner and NDA holder and if, within 45 days of receiving notice, either the patent owner or NDA
holder sues for patent infringement, approval of the ANDA or 505(b)(2) NDA is stayed for up to 30 months.

Accordingly, if any of our small molecule drug candidates, such as UBX1325, are approved, competitors could file ANDAs for generic versions of our
small molecule drug products or 505(b)(2) NDAs that reference our small molecule drug products. If there are patents listed for our small molecule drug
products in the Orange Book, those ANDAs and 505(b)(2) NDAs would be required to include a certification as to each listed patent indicating whether the
ANDA applicant does or does not intend to challenge the patent. We cannot predict which, if any, patents in our current portfolio or patents we may obtain
in the future will be eligible for listing in the Orange Book, how any generic competitor would address such patents, whether we would sue on any such
patents, or the outcome of any such suit.

We may not be successful in securing or maintaining proprietary patent protection for products and technologies we develop or license. Moreover, if any of
our  owned  or  in-licensed  patents  that  are  listed  in  the  Orange  Book  are  successfully  challenged  by  way  of  a  Paragraph  IV  certification  and  subsequent
litigation, the affected product could immediately face generic competition and its sales would likely decline rapidly and materially.

Any biologic, or large molecule, drug candidates for which we intend to seek approval may face competition sooner than anticipated.

If we are successful in achieving regulatory approval to commercialize any biologic drug candidate faster than our competitors, such drug candidates may
face competition from biosimilar products. In the United States, large molecule drug candidates are regulated by the FDA as biologic products subject to
approval under the biologics license application, or BLA, pathway. The Biologics Price Competition and Innovation Act of 2009, or BPCIA, creates an
abbreviated  pathway  for  the  approval  of  biosimilar  and  interchangeable  biologic  products  following  the  approval  of  an  original  BLA.  The  abbreviated
regulatory pathway establishes legal authority for the FDA to review and approve biosimilar biologics, including the possible designation of a biosimilar as
“interchangeable” based on its similarity to an existing brand product. Under the BPCIA, an application for a biosimilar product cannot be approved by the
FDA until 12 years after the original branded product was approved under a BLA. The law is complex and is still being interpreted and implemented by the
FDA. As a result, its ultimate impact, implementation, and meaning are subject to uncertainty.

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Moreover, the extent to which a biosimilar product, once approved, will be substituted for any one of our reference products in a way that is similar to
traditional generic substitution for non-biologic products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still
developing. In addition, a competitor could decide to forego the biosimilar approval path and submit a full BLA after completing its own preclinical studies
and clinical studies. In such cases, any exclusivity to which we may be eligible under the BPCIA would not prevent the competitor from marketing its
product as soon as it is approved.

If  competitors  are  able  to  obtain  marketing  approval  for  biosimilars  referencing  our  large  molecule  drug  candidates,  if  approved,  such  products  may
become  subject  to  competition  from  such  biosimilars,  with  the  attendant  competitive  pressure  and  potential  adverse  consequences.  Such  competitive
products may be able to immediately compete with us in each indication for which our drug candidates may have received approval.

Enacted  and  future  healthcare  legislation  may  increase  the  difficulty  and  cost  for  us  to  obtain  marketing  approval  of  and  commercialize  our  drug
candidates and may affect the prices we may set.

In the United States, the European Union and other jurisdictions, there have been, and we expect there will continue to be, a number of legislative and
regulatory  changes  and  proposed  changes  to  the  healthcare  system  that  could  affect  our  future  results  of  operations.  In  particular,  there  have  been  and
continue to be a number of initiatives at the U.S. federal and state levels that seek to reduce healthcare costs and improve the quality of healthcare. For
example, in March 2010, the Patient Protection and ACA, as amended by the Health Care and Education Reconciliation Act, or collectively the Affordable
Care Act, was enacted, which substantially changed the way healthcare is financed by both governmental and private insurers. Among the provisions of the
ACA, those of greatest importance to the pharmaceutical and biotechnology industries include the following:

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an annual, non-deductible fee payable by any entity that manufactures or imports certain branded prescription drugs and biologic agents (other
than  those  designated  as  orphan  drugs),  which  is  apportioned  among  these  entities  according  to  their  market  share  in  certain  government
healthcare programs;

a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 70% point-of-sale discounts off negotiated
prices of applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s outpatient drugs
to be covered under Medicare Part D;

an increase in the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program to 23.1% and 13.0% of the
average manufacturer price for branded and generic drugs, respectively;

a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled,
infused, instilled, implanted or injected;

extension of a manufacturer’s Medicaid rebate liability to covered drugs dispensed to individuals who are enrolled in Medicaid managed care
organizations;

expansion of eligibility criteria for Medicaid programs by, among other things, allowing states to offer Medicaid coverage to certain individuals
with income at or below 133% of the federal poverty level, thereby potentially increasing a manufacturer’s Medicaid rebate liability;

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

creation  of  the  Independent  Payment  Advisory  Board,  which,  once  empaneled,  will  have  the  authority  to  recommend  certain  changes  to  the
Medicare program that could result in reduced payments for prescription drugs and those recommendations could have the effect of law unless
overruled by a supermajority vote of Congress; and

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•

establishment of a Center for Medicare Innovation at the Centers for Medicare & Medicaid Services, or CMS, to test innovative payment and
service delivery models to lower Medicare and Medicaid spending, potentially including prescription drug spending.

Since its enactment, there have been judicial and Congressional challenges to certain aspects of the Affordable Care Act. For example, the Tax Cuts and
Jobs Act of 2017, or the Tax Act, includes a provision repealing, 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, there may be other efforts to challenge, repeal or replace the ACA that may impact our business or financial condition.

In addition, other legislative changes have been proposed and adopted in the United States since the Affordable Care Act was enacted. In August 2011, the
Budget Control Act of 2011, among other things, led to aggregate reductions of Medicare payments to providers of 2% per fiscal year. These reductions
went into effect in April 2013 and, due to subsequent legislative amendments to the statute, will remain in effect through 2030, with the exception of a
temporary  suspension  from  May  1,  2020  through  December  31,  2021,  unless  additional  action  is  taken  by  Congress.  In  addition,  in  January  2013,  the
American Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to several types of providers,
including  hospitals,  imaging  centers  and  cancer  treatment  centers,  and  increased  the  statute  of  limitations  period  for  the  government  to  recover
overpayments to providers from three to five years.

Individual  states  in  the  United  States  have  also  become  increasingly  aggressive  in  passing  legislation  and  implementing  regulations  designed  to  control
pharmaceutical and biological 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.
Legally mandated price controls on payment amounts by third-party payors or other restrictions could harm our business, results of operations, financial
condition and prospects. In addition, regional healthcare authorities and individual hospitals are increasingly using bidding procedures to determine what
pharmaceutical  products  and  which  suppliers  will  be  included  in  their  prescription  drug  and  other  healthcare  programs.  This  could  reduce  the  ultimate
demand  for  our  drug  candidates  or  put  pressure  on  our  product  pricing.  Moreover,  payment  methodologies  may  be  subject  to  changes  in  healthcare
legislation and regulatory initiatives. For example, CMS may develop new payment and delivery models, such as bundled payment models. In addition,
recently there has been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products.

In the European Union, similar political, economic and regulatory developments may affect our ability to profitably commercialize our drug candidates, if
approved. In addition to continuing pressure on prices and cost containment measures, legislative developments at the EU or member state level may result
in significant additional requirements or obstacles that may increase our operating costs. The delivery of healthcare in the European Union, including the
establishment and operation of health services and the pricing and reimbursement of medicines, is almost exclusively a matter for national, rather than EU,
law and policy. National governments and health service providers have different priorities and approaches to the delivery of health care and the pricing
and  reimbursement  of  products  in  that  context.  In  general,  however,  the  healthcare  budgetary  constraints  in  most  European  Union  member  states  have
resulted in restrictions on the pricing and reimbursement of medicines by relevant health service providers. Coupled with ever-increasing EU and national
regulatory burdens on those wishing to develop and market products, this could prevent or delay marketing approval of our drug candidates, restrict or
regulate  post-approval  activities  and  affect  our  ability  to  commercialize  our  drug  candidates,  if  approved.  In  markets  outside  of  the  United  States  and
European  Union,  reimbursement  and  healthcare  payment  systems  vary  significantly  by  country,  and  many  countries  have  instituted  price  ceilings  on
specific products and therapies.

We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action in the United
States,  the  European  Union  or  any  other  jurisdiction.  If  we  or  any  third  parties  we  may  engage  are  slow  or  unable  to  adapt  to  changes  in  existing
requirements  or  the  adoption  of  new  requirements  or  policies,  or  if  we  or  such  third  parties  are  not  able  to  maintain  regulatory  compliance,  our  drug
candidates may lose any regulatory approval that may have been obtained and we may not achieve or sustain profitability.

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Our  business  operations  and  current  and  future  relationships  with  investigators,  healthcare  professionals,  consultants,  third-party  payors,  patient
organizations and customers will be subject to applicable healthcare regulatory laws, which could expose us to penalties.

Our  business  operations  and  current  and  future  arrangements  with  investigators,  healthcare  professionals,  consultants,  third-party  payors,  patient
organizations and customers, may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations. These laws may constrain the
business or financial arrangements and relationships through which we conduct our operations, including how we research, market, sell and distribute our
drug candidates, if approved.

Such laws include:

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the  U.S.  federal  Anti-Kickback  Statute,  which  prohibits,  among  other  things,  persons  or  entities  from  knowingly  and  willfully  soliciting,
offering, receiving or providing any remuneration (including any kickback, bribe, or certain rebate), directly or indirectly, overtly or covertly, in
cash or in kind, to induce or reward, or in return for, either the referral of an individual for, or the purchase, lease, order or recommendation of,
any good, facility, item or service, for which payment may be made, in whole or in part, under U.S. federal and state healthcare programs such
as Medicare and Medicaid. A person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to
have committed a violation;

the  U.S.  federal  false  claims  and  civil  monetary  penalties  laws,  including  the  civil  False  Claims  Act,  which,  among  other  things,  impose
criminal and civil penalties, including through civil whistleblower or qui tam actions, against individuals or entities for knowingly presenting, or
causing to be presented, to the U.S. federal government, claims for payment or approval that are false or fraudulent, knowingly making, using or
causing to be made or used, a false record or statement material to a false or fraudulent claim, or from knowingly making a false statement to
avoid,  decrease  or  conceal  an  obligation  to  pay  money  to  the  U.S.  federal  government.  In  addition,  the  government  may  assert  that  a  claim
including  items  and  services  resulting  from  a  violation  of  the  U.S.  federal  Anti-Kickback  Statute  constitutes  a  false  or  fraudulent  claim  for
purposes of the False Claims Act;

the U.S. federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which imposes criminal and civil liability for, among
other things, knowingly and willfully executing, or attempting to execute, 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 U.S. 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 FDCA, which prohibits, among other things, the adulteration or misbranding of drugs, biologics and medical devices;

the  U.S.  Public  Health  Service  Act,  which  prohibits,  among  other  things,  the  introduction  into  interstate  commerce  of  a  biological  product
unless a biologics license is in effect for that product;

the U.S. Physician Payments Sunshine Act and its implementing regulations, which require certain manufacturers of drugs, devices, biologics
and  medical  supplies  that  are  reimbursable  under  Medicare,  Medicaid,  or  the  Children’s  Health  Insurance  Program  to  report  annually  to  the
government information related to certain payments and other transfers of value to physicians (defined to include doctors, dentists, optometrists,
podiatrists and chiropractors), certain other healthcare providers starting in 2022, and teaching hospitals, as well as ownership and investment
interests held by the physicians described above and their immediate family members;

analogous  U.S.  state  laws  and  regulations,  including:  state  anti-kickback  and  false  claims  laws,  which  may  apply  to  our  business  practices,
including  but  not  limited  to,  research,  distribution,  sales  and  marketing  arrangements  and  claims  involving  healthcare  items  or  services
reimbursed by any third-party payor,

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including private insurers; state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance
guidelines and the relevant compliance guidance promulgated by the U.S. federal government, or otherwise restrict payments that may be made
to healthcare providers and other potential referral sources; and state laws and regulations that require drug manufacturers to file reports relating
to  pricing  and  marketing  information,  which  requires  tracking  gifts  and  other  remuneration  and  items  of  value  provided  to  healthcare
professionals and entities; and

•

similar healthcare laws and regulations in the European Union and other jurisdictions, including reporting requirements detailing interactions
with and payments to healthcare providers.

Ensuring  that  our  internal  operations  and  future  business  arrangements  with  third  parties  comply  with  applicable  healthcare  laws  and  regulations  will
involve substantial costs. It is possible that governmental authorities will conclude that our business practices do not comply with current or future statutes,
regulations, agency guidance 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  the  laws  described  above  or  any  other  governmental  laws  and  regulations  that  may  apply  to  us,  we  may  be  subject  to  significant
penalties, including civil, criminal and administrative penalties, damages, fines, exclusion from government-funded healthcare programs, such as Medicare
and  Medicaid  or  similar  programs  in  other  countries  or  jurisdictions,  disgorgement,  individual  imprisonment,  contractual  damages,  reputational  harm,
diminished profits and the curtailment or restructuring of our operations. Further, defending against any such actions can be costly, time-consuming and
may require significant personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our
business may be impaired.

U.S.  tax  legislation  and  future  changes  to  applicable  U.S.  tax  laws  and  regulations  may  have  a  material  adverse  effect  on  our  business,  financial
condition and results of operations.

New  income,  sales,  use  or  other  tax  laws,  statutes,  rules,  regulations  or  ordinances  could  be  enacted  at  any  time,  or  interpreted,  changed,  modified  or
applied adversely to us, any of which could adversely affect our business operations and financial performance. We are currently unable to predict whether
such changes will occur and, if so, the ultimate impact on our business. To the extent that such changes have a negative impact on us, our suppliers or our
customers,  including  as  a  result  of  related  uncertainty,  these  changes  may  materially  and  adversely  impact  our  business,  financial  condition,  results  of
operations and cash flows.

Risks Related to Ownership of Our Common Stock

Our stock price may be volatile and you may not be able to resell shares of our common stock at or above the price you paid.

The trading price of our common stock may be highly volatile and may be subject to wide fluctuations in response to various factors, some of which are
beyond our control.

These factors include those discussed in this “Risk Factors” section of this report and others such as:

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results from, and any delays in, commencing, conducting or completing our clinical studies for our current drug candidates, or any other future
clinical development programs;

announcements by academic or other third parties challenging the fundamental premises underlying our approach to treating diseases of aging
and/or drug development;

announcements of regulatory approval or disapproval of our current or any future drug candidates;

failure or discontinuation of any of our research and development programs;

announcements relating to future licensing, collaboration, or development agreements;

delays in the commercialization of our current or any future drug candidates;

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public misperception regarding the use of our therapies, or public bias of against “anti-aging” companies;

acquisitions and sales of new products, technologies, or businesses;

manufacturing and supply issues related to our drug candidates for clinical studies or future drug candidates for commercialization;

quarterly variations in our results of operations or those of our future competitors;

changes in earnings estimates or recommendations by securities analysts;

announcements by us or our competitors of new products, significant contracts, commercial relationships, acquisitions, or capital commitments;

developments with respect to intellectual property rights;

our commencement of, or involvement in, litigation;

changes in financial estimates or guidance, including our ability to meet our future revenue and operating profit or loss estimates or guidance;

any major changes in our board of directors or management;

new legislation in the United States relating to the sale or pricing of pharmaceuticals;

FDA or other U.S. or foreign regulatory actions affecting us or our industry;

product liability claims or other litigation or public concern about the safety of our drug candidates;

market conditions in the pharmaceutical, biopharmaceutical and biotechnology sectors; and

general economic conditions in the United States and abroad.

In addition, the stock markets in general, and the markets for pharmaceutical, biopharmaceutical, and biotechnology stocks in particular, have experienced
extreme volatility as a result of the COVID-19 pandemic that may be unrelated to the operating performance of the issuer. These broad market fluctuations
may adversely affect the trading price or liquidity of our common stock. In the past, when the market price of a stock has been volatile, holders of that
stock have sometimes instituted securities class action litigation against the issuer. If any of our stockholders were to bring such a lawsuit against us, we
could incur substantial costs defending the lawsuit and the attention of our management would be diverted from the operation of our business.

An active, liquid and orderly market for our common stock may not develop and may not be maintained.

Prior to our initial public offering in May 2018, there was no public market for shares of our common stock. Although our common stock is listed on the
Nasdaq Global Select Market, an active trading market for our common stock may never be sustained on the Nasdaq Global Select Market or any other
exchange in the future. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you
consider reasonable. An inactive market may also impair our ability to raise capital by selling shares and may impair our ability to acquire other businesses,
applications, or technologies using our shares as consideration.

If securities or industry analysts do not publish research or reports about our business, or if they issue an adverse or misleading opinion regarding our
stock, our stock price and trading volume could decline.

The trading market for our common stock is influenced by the research and reports that industry or securities analysts publish about us or our business. In
the event any of the analysts who cover us issue an adverse or

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misleading opinion regarding us, our business model, our intellectual property or our stock performance, or if our clinical studies and operating results fail
to meet the expectations of analysts, our stock price would likely decline. If one or more of these analysts cease coverage of us or fail to publish reports on
us regularly, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

If  we  sell  shares  of  our  common  stock  in  future  financings,  stockholders  may  experience  immediate  dilution  and,  as  a  result,  our  stock  price  may
decline.

We may from time to time issue additional shares of common stock at a discount from the current trading price of our common stock. As a result, our
stockholders would experience immediate dilution upon the purchase of any shares of our common stock sold at such discount. In addition, as opportunities
present themselves, we may enter into financing or similar arrangements in the future, including the issuance of debt securities, preferred stock or common
stock. For example, on June 3, 2019, we filed a Registration Statement on Form S-3, covering the offering of up to $250.0 million of shares of common
stock,  preferred  stock,  debt  securities,  warrants  and  units,  and  entered  into  a  sales  agreement,  or  the  June  2019  Sales  Agreement,  with  Cowen  and
Company, LLC, or Cowen, to sell shares of our common stock, from time to time, with aggregate gross sales proceeds of up to $75.0 million, through an
at-the-market equity offering program, or Initial ATM Offering Program, under which Cowen acts as our sales agent. On July 31, 2020, we entered into the
July 2020 Sales Agreement with Cowen to sell shares of our common stock, from time to time, with aggregate gross sales proceeds of up to $50.0 million,
through an additional at-the-market equity offering program, or our Additional ATM Offering Program, under which Cowen acts as our sales agent. During
the year ended December 31, 2020, we issued and sold 5,002,257 shares of our common stock through our Initial ATM Offering Program. During the year
ended  December  31,  2021,  we  issued  and  sold  1,187,068  shares  of  the  Company’s  common  stock  sold  through  the  Initial  ATM  Offering  Program  and
707,459 shares of the Company’s common stock sold through the Additional ATM Offering Program. On September 29, 2021, we entered into a Purchase
Agreement with Lincoln Park Capital Fund, LLC, under which we may at our discretion sell up to $30.0 million shares of our common stock, subject to
certain  daily  limits,  applicable  prices,  and  conditions.  As  of  December  31,  2021,  we  issued  and  sold  4,172,855  shares  of  our  common  stock  under  our
Purchase Agreement with Lincoln Park amounting to $8.3 million in gross proceeds. In addition, under the Purchase Agreement, we issued 252,447 shares
of our common stock to Lincoln Park as consideration for its commitment to purchase shares of our common stock under the Purchase Agreement.

We generally have the right to control the timing and amount of any future sales of our common stock to Lincoln Park. Sales of shares of our common
stock, if any, to Lincoln Park will depend upon market conditions and other factors to be determined by us. We may ultimately decide to sell to Lincoln
Park all, some or none of the additional shares of our common stock that may be available for us to sell under the Purchase Agreement. If and when we do
sell shares of our common stock to Lincoln Park, after Lincoln Park has acquired the shares of common stock, Lincoln Park may resell all, some or none of
those shares of common stock at any time or in its discretion. The sale by Lincoln Park of a substantial number of shares of our common stock issued by us
to Lincoln Park under the Purchase Agreement or the anticipation of such sales, could make it more difficult for us to sell equity or equity-related securities
in the future at a time and at a price that we might otherwise wish to effect sales.

In addition, on December 15, 2021 we entered into an amendment to our Loan and Security Agreement dated August 3, 2020 with Hercules Capital, Inc.,
under the terms of Hercules (including any of its assignees) has the option for a period of six (6) months to convert up to $5.0 million of the outstanding
principal under the existing loan into shares of the Company’s common stock. As of December 31, 2021, we issued 1,727,361 shares of our common stock
to Hercules in accordance with this amendment.

Sales of substantial amounts of shares of our common stock or other securities by our stockholders, by us under the Shelf Registration Statement, whether
pursuant to the ATM Offering Program or otherwise or by Lincoln Park or through the Hercules Amendment or through any other means could also lower
the market price of our common stock and impair our ability to raise capital through the sale of equity or equity-related securities.

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Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

We have incurred substantial losses during our history and may never achieve profitability. To the extent that we continue to generate taxable losses, unused
losses will carry forward to offset a portion of future taxable income, if any, until such unused losses expire, if ever. Under Sections 382 and 383 of the
Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change,” generally defined as a greater than 50 percentage point
change (by value) in its equity ownership by certain stockholders over a three-year period, the corporation’s ability to use its pre-change net operating loss
carryforwards, or NOLs, and other pre-change tax attributes (such as research and development tax credits) to offset its post-change income or taxes may
be limited. We may have experienced ownership changes in the past and may experience ownership changes in the future as a result of subsequent shifts in
our stock ownership (some of which shifts are outside our control). As a result, if we earn net taxable income, our ability to use our pre-change NOLs to
offset such taxable income could be subject to limitations. Similar provisions of state tax law may also apply. As a result, even if we achieve profitability,
we may be unable to use a material portion of our NOLs and other tax attributes.

Provisions in our charter documents and under Delaware law could discourage a takeover that stockholders may consider favorable and may lead to
entrenchment of management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent changes in control or
changes in our management without the consent of our board of directors. These provisions include the following:

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a  classified  board  of  directors  with  three-year  staggered  terms,  which  may  delay  the  ability  of  stockholders  to  change  the  membership  of  a
majority of our board of directors;

no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;

the  exclusive  right  of  our  board  of  directors  to  elect  a  director  to  fill  a  vacancy  created  by  the  expansion  of  the  board  of  directors  or  the
resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;

the ability of our board of directors to authorize the issuance of shares of preferred stock and to determine the price and other terms of those
shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a
hostile acquiror;

the ability of our board of directors to alter our amended and restated bylaws without obtaining stockholder approval;

the required approval of at least 66 2/3% of the shares entitled to vote at an election of directors to adopt, amend or repeal our amended and
restated bylaws or repeal the provisions of our amended and restated certificate of incorporation regarding the election and removal of directors;

a  prohibition  on  stockholder  action  by  written  consent,  which  forces  stockholder  action  to  be  taken  at  an  annual  or  special  meeting  of  our
stockholders;

the  requirement  that  a  special  meeting  of  stockholders  may  be  called  only  by  the  chief  executive  officer  or  the  president  or  the  board  of
directors,  which  may  delay  the  ability  of  our  stockholders  to  force  consideration  of  a  proposal  or  to  take  action,  including  the  removal  of
directors; and

advance notice procedures that stockholders must comply with in order to nominate candidates to our board of directors or to propose matters to
be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquiror from conducting a solicitation of proxies to elect
the acquiror’s own slate of directors or otherwise attempting to obtain control of us.

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We are also subject to the anti-takeover provisions contained in Section 203 of the Delaware General Corporation Law. Under Section 203, a corporation
may not, in general, engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three
years or, among other exceptions, the board of directors has approved the transaction.

Claims for indemnification by our directors and officers may reduce our available funds to satisfy successful third-party claims against us and may
reduce the amount of money available to us.

Our amended and restated certificate of incorporation and amended and restated bylaws provide that we will indemnify our directors and officers, in each
case to the fullest extent permitted by Delaware law.

In addition, as permitted by Section 145 of the Delaware General Corporation Law, our amended and restated bylaws and our indemnification agreements
that we have entered into with our directors and officers provide that:

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We will indemnify our directors and officers for serving us in those capacities or for serving other business enterprises at our request, to the
fullest extent permitted by Delaware law. Delaware law provides that a corporation may indemnify such person if such person acted in good
faith and in a manner such person reasonably believed to be in or not opposed to the best interests of the registrant and, with respect to any
criminal proceeding, had no reasonable cause to believe such person’s conduct was unlawful.

We may, in our discretion, indemnify employees and agents in those circumstances where indemnification is permitted by applicable law.

We  are  required  to  advance  expenses,  as  incurred,  to  our  directors  and  officers  in  connection  with  defending  a  proceeding,  except  that  such
directors or officers shall undertake to repay such advances if it is ultimately determined that such person is not entitled to indemnification. We
will not be obligated pursuant to our amended and restated bylaws to indemnify a person with respect to proceedings initiated by that person
against  us  or  our  other  indemnitees,  except  with  respect  to  proceedings  authorized  by  our  board  of  directors  or  brought  to  enforce  a  right  to
indemnification.

The rights conferred in our amended and restated bylaws are not exclusive, and we are authorized to enter into indemnification agreements with
our directors, officers, employees and agents and to obtain insurance to indemnify such persons.

We  may  not  retroactively  amend  our  amended  and  restated  bylaw  provisions  to  reduce  our  indemnification  obligations  to  directors,  officers,
employees and agents.

We do not currently intend to pay dividends on our common stock, and, consequently, your ability to achieve a return on your investment will depend
on appreciation in the price of our common stock.

We do not currently intend to pay any cash dividends on our common stock for the foreseeable future. We currently intend to invest our future earnings, if
any, to fund our growth. Therefore, you are not likely to receive any dividends on your common stock for the foreseeable future. Since we do not intend to
pay dividends, your ability to receive a return on your investment will depend on any future appreciation in the market value of our common stock. There is
no guarantee that our common stock will appreciate or even maintain the price at which our holders have purchased it.

General Risk Factors

Unfavorable global economic or political conditions could adversely affect our business, financial condition or results of operations.

Our results of operations could be adversely affected by general conditions in the global economy and in the global financial markets. Furthermore, the
market for products with the potential to treat diseases of aging, particularly those affecting large populations in a wide range of geographic locations, may
be particularly vulnerable to unfavorable economic conditions. A global financial crisis or a global or regional political disruption, including

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most recently as a result of the COVID-19 pandemic, have caused and could continue to cause extreme volatility in the capital and credit markets. A severe
or prolonged economic downturn or political disruption could result in a variety of risks to our business, including weakened demand for our current drug
candidates  or  any  future  drug  candidates,  if  approved,  and  our  ability  to  raise  additional  capital  when  needed  on  acceptable  terms,  if  at  all.  A  weak  or
declining economy or political disruption could also strain our manufacturers or suppliers, possibly resulting in supply disruption, or cause our customers to
delay making payments for our services. Weakened or declining economic conditions could be caused by a number of factors. Any of the foregoing could
harm our business and we cannot anticipate all of the ways in which the political or economic climate and financial market conditions could adversely
impact our business.

We or the third parties upon whom we depend may be adversely affected by earthquakes, other natural disasters or unforeseen pandemics and public
health emergencies, such as the COVID-19 pandemic, and our business continuity and disaster recovery plans may not adequately protect us from a
serious disaster.

Our corporate headquarters and other facilities are located in the San Francisco Bay Area, which in the past has experienced both severe earthquakes and
wildfires.  Although  we  carry  earthquake  insurance,  it  is  limited  in  scope.  Earthquakes,  wildfires  or  other  natural  disasters  could  severely  disrupt  our
operations, and have a material adverse effect on our business, results of operations, financial condition and prospects.

If a natural disaster, power outage or other event occurred that prevented us from using all or a significant portion of our headquarters, that damaged critical
infrastructure,  such  as  our  enterprise  financial  systems  or  manufacturing  resource  planning  and  enterprise  quality  systems,  or  that  otherwise  disrupted
operations, it may be difficult or, in certain cases, impossible, for us to continue our business for a substantial period of time. The disaster recovery and
business continuity plans we have in place currently are limited and are unlikely to prove adequate in the event of a serious disaster or similar event. We
may  incur  substantial  expenses  as  a  result  of  the  limited  nature  of  our  disaster  recovery  and  business  continuity  plans,  which,  particularly  when  taken
together with our lack of earthquake insurance, could have a material adverse effect on our business. Measures taken in response to a pandemic, such as the
COVID-19  pandemic,  which  causes  a  public  health  emergency,  could  also  disrupt  our  operations,  and  have  a  material  adverse  effect  on  our  business,
results of operations, financial condition and prospects. For example, in mid-March 2020, in alignment with federal, state and local guidance designed to
slow the spread of COVID-19, we transitioned to a remote work plan and reduced onsite staffing model for all employees who cannot perform their work
from home, such as our laboratory, operations, and facilities staff. As the COVID-19 pandemic evolves, we may be required to take additional actions that
could impact our operations if required by applicable laws or regulations or if we determine them to be in the best interests of our employees.

Furthermore, integral parties in our supply chain are similarly vulnerable to natural disasters or other sudden, unforeseen and severe adverse events. If such
an event were to affect our supply chain, it could have a material adverse effect on our business.

Significant  disruptions  of  information    technology  systems  or  breaches  of  data  security  could  materially  adversely  affect  our  business,  results  of
operations and financial condition.

We collect and maintain information in digital form that is necessary to conduct our business, and we are increasingly dependent on information technology
systems  and  infrastructure  to  operate  our  business.  In  the  ordinary  course  of  our  business,  we  collect,  store  and  transmit  large  amounts  of  confidential
information, including intellectual property, proprietary business information and personal information. It is critical that we do so in a secure manner to
maintain  the  confidentiality  and  integrity  of  such  confidential  information.  We  have  established  physical,  electronic  and  organizational  measures  to
safeguard and secure our systems to prevent a data compromise, and rely on commercially available systems, software, tools, and monitoring to provide
security for our information technology systems and the processing, transmission and storage of digital information. We have also outsourced elements of
our information technology infrastructure, and as a result a number of third-party vendors may or could have access to our confidential information. Our
internal  information  technology  systems  and  infrastructure,  and  those  of  our  current  and  any  future  collaborators,  contractors  and  consultants  and  other
third  parties  on  which  we  rely,  are  vulnerable  to  damage  from  computer  viruses,  malware,  natural  disasters,  terrorism,  war,  telecommunication  and
electrical  failures,  cyberattacks  or  cyber-intrusions  over  the  Internet,  attachments  to  emails,  persons  inside  our  organization,  or  persons  with  access  to
systems inside our organization.

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The risk of a security breach or disruption, particularly through cyberattacks or cyber-intrusion, including by computer hackers, “phishing” attacks, foreign
governments and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the
world  have  increased.  In  addition,  the  prevalent  use  of  mobile  devices  that  access  confidential  information  increases  the  risk  of  data  security  breaches,
which could lead to the loss of confidential information or other intellectual property. As a result of COVID-19, we may face increased cybersecurity risks
due  to  our  reliance  on  internet  technology  and  the  number  of  our  employees  that  are  working  remotely,  which  may  create  additional  opportunities  for
cybercriminals to exploit vulnerabilities. The costs to us to mitigate network security problems, bugs, viruses, worms, malicious software programs and
security  vulnerabilities  could  be  significant,  and  while  we  have  implemented  security  measures  to  protect  our  data  security  and  information  technology
systems,  our  efforts  to  address  these  problems  may  not  be  successful,  and  these  problems  could  result  in  unexpected  interruptions,  delays,  cessation  of
service and other harm to our business and our competitive position. If such an event were to occur and cause interruptions in our operations, it could result
in a material disruption of our product development programs. For example, the loss of clinical study data from completed or ongoing or planned clinical
studies could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data.

Moreover, if a computer security breach affects our systems, or those of our current and any future collaborators, contractors and consultants and other third
parties  on  which  we  rely,  or  results  in  the  unauthorized  release  of  personally  identifiable  information,  our  reputation  could  be  materially  damaged.  In
addition,  such  a  breach  may  require  notification  to  governmental  agencies,  the  media  or  individuals  pursuant  to  various  federal  and  state  privacy  and
security laws, if applicable, including the Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information Technology
for  Economic  and  Clinical  Health  Act  of  2009,  and  its  implementing  rules  and  regulations,  as  well  as  regulations  promulgated  by  the  Federal  Trade
Commission  and  state  breach  notification  laws.  We  would  also  be  exposed  to  a  risk  of  loss  or  litigation  and  potential  liability,  which  could  materially
adversely affect our business, results of operations and financial condition.

Our  employees  and  independent  contractors,  including  principal  investigators,  consultants,  commercial  collaborators,  service  providers  and  other
vendors may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could
have an adverse effect on our results of operations.

We  are  exposed  to  the  risk  that  our  employees  and  independent  contractors,  including  principal  investigators,  consultants,  any  future  commercial
collaborators, service providers and other vendors may engage in misconduct or other illegal activity. Misconduct by these parties could include intentional,
reckless  and/or  negligent  conduct  or  other  unauthorized  activities  that  violate  the  laws  and  regulations  of  the  FDA  and  other  similar  regulatory  bodies,
including those laws that require the reporting of true, complete and accurate information to such regulatory bodies; manufacturing standards; U.S. federal
and state healthcare fraud and abuse, data privacy laws and other similar non-U.S. laws; or laws that require the true, complete and accurate reporting of
financial information or data. Activities subject to these laws also involve the improper use or misrepresentation of information obtained in the course of
clinical studies, the creation of fraudulent data in our preclinical studies or clinical studies, or illegal misappropriation of product, which could result in
regulatory  sanctions  and  cause  serious  harm  to  our  reputation.  It  is  not  always  possible  to  identify  and  deter  misconduct  by  employees  and  other  third-
parties,  and  the  precautions  we  take  to  detect  and  prevent  this  activity  may  not  be  effective  in  controlling  unknown  or  unmanaged  risks  or  losses  or  in
protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. In
addition, we are subject to the risk that a person or government could allege such fraud or other misconduct, even if none occurred. If any such actions are
instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business
and  financial  results,  including,  without  limitation,  the  imposition  of  significant  civil,  criminal  and  administrative  penalties,  damages,  monetary  fines,
disgorgements, possible exclusion from participation in Medicare, Medicaid and other U.S. healthcare programs, individual imprisonment, other sanctions,
contractual damages, reputational harm, diminished profits and future earnings and curtailment of our operations, any of which could adversely affect our
ability to operate our business and our results of operations.

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Our business involves the use of hazardous materials, and we and our third-party manufacturers and suppliers must comply with environmental laws
and regulations, which can be expensive and restrict how we do business.

Our  research  and  development  activities  and  our  third-party  manufacturers’  and  suppliers’  activities  involve  the  controlled  storage,  use  and  disposal  of
hazardous materials owned by us, including the components of our product and drug candidates and other hazardous compounds. We and any third-party
manufacturers and suppliers we engage are subject to numerous federal, state and local environmental, health and safety laws, regulations and permitting
requirements, including those governing laboratory procedures; the generation, handling, use, storage, treatment, and disposal of hazardous and regulated
materials and wastes; the emission and discharge of hazardous materials into the ground, air and water; and employee health and safety. Our operations
involve  the  use  of  hazardous  and  flammable  materials,  including  chemicals  and  biological  and  radioactive  materials.  Our  operations  also  produce
hazardous waste. In some cases, these hazardous materials and various wastes resulting from their use are stored at our and our manufacturers’ facilities
pending  their  use  and  disposal.  We  generally  contract  with  third  parties  for  the  disposal  of  these  materials  and  wastes.  We  cannot  eliminate  the  risk  of
contamination,  which  could  cause  an  interruption  of  our  commercialization  efforts,  research  and  development  efforts  and  business  operations,
environmental damage resulting in costly clean-up and liabilities under applicable laws and regulations governing the use, storage, handling and disposal of
these materials and specified waste products.

Although we believe that the safety procedures utilized by our third-party manufacturers for handling and disposing of these materials generally comply
with the standards prescribed by these laws and regulations, we cannot guarantee that this is the case or eliminate the risk of accidental contamination or
injury from these materials. Under certain environmental laws, we could be held responsible for costs relating to any contamination at our current or past
facilities and at third-party facilities. In such an event, we may be held liable for any resulting damages and such liability could exceed our resources and
state or federal or other applicable authorities may curtail our use of certain materials and/or interrupt our business operations. Furthermore, environmental
laws and regulations are complex, change frequently and have tended to become more stringent. We cannot predict the impact of such changes and cannot
be certain of our future compliance.

Compliance with applicable environmental laws and regulations may be expensive, and current or future environmental laws and regulations may impair
our research, product development and manufacturing efforts. In addition, we cannot entirely eliminate the risk of accidental injury or contamination from
these materials or wastes. Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our
employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not carry
specific biological or hazardous waste insurance coverage, and our property, casualty, and general liability insurance policies specifically exclude coverage
for  damages  and  fines  arising  from  biological  or  hazardous  waste  exposure  or  contamination.  Accordingly,  in  the  event  of  contamination  or  injury,  we
could be held liable for damages or be penalized with fines in an amount exceeding our resources, and our clinical studies or regulatory approvals could be
suspended, which could have a material adverse effect on our business, results of operations and financial condition.

We may be subject to claims challenging the inventorship or ownership of our patents and other intellectual property.

We may also be subject to claims that former employees, collaborators or other third parties have an ownership interest in our patents or other intellectual
property. Litigation may be necessary to defend against these and other claims challenging inventorship or ownership. If we fail in defending any such
claims, in addition to paying monetary damages, we may lose valuable intellectual property rights. Such an outcome could have a material adverse effect
on our business. Even if we are successful in defending against such claims, litigation could result in substantial costs and distraction to management and
other employees.

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

Filing, prosecuting and defending patents on drug candidates in all countries throughout the world would be prohibitively expensive, and our intellectual
property  rights  in  some  countries  outside  the  United States  can  be  less  extensive  than  those  in  the  United States.  In  addition,  the  laws  of  some  foreign
countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to

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prevent  third  parties  from  practicing  our  inventions  in  all  countries  outside  the  United  States,  or  from  selling  or  importing  products  made  using  our
inventions in and into the United States or other jurisdictions. 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
enforcement is not as strong as that in the United States. These products may compete with our products and our patents or other intellectual property rights
may not be effective or sufficient to prevent them from 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 costs and divert our
efforts  and  attention  from  other  aspects  of  our  business,  could  put  our  patents  at  risk  of  being  invalidated  or  interpreted  narrowly  and  our  patent
applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the
damages or other remedies awarded, if any, may not be commercially meaningful.

Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from
the intellectual property that we develop or license.

Actual  or  perceived  failures  to  comply  with  U.S.  and  foreign  privacy  and  data  protection  laws,  regulations  and  standards  may  adversely  affect  our
business, operations and financial performance.

We are subject to or affected by numerous federal, state and foreign laws and regulations, as well as regulatory guidance, governing the collection, use,
disclosure, retention, and security of personal information, such as information that we collect about patients and healthcare providers in connection with
clinical  trials  in  the  United  States  and  abroad.  The  global  data  protection  landscape  is  rapidly  evolving,  and  implementation  standards  and  enforcement
practices  are  likely  to  remain  uncertain  for  the  foreseeable  future.  This  evolution  may  create  uncertainty  in  our  business,  affect  our  or  any  service
providers’, contractors’ or future collaborators’ ability to operate in certain jurisdictions or to collect, store, transfer use and share personal information,
necessitate the acceptance of more onerous obligations in our contracts, result in liability or impose additional costs on us. The cost of compliance with
these  laws,  regulations  and  standards  is  high  and  is  likely  to  increase  in  the  future.  Any  failure  or  perceived  failure  by  us  or  our  collaborators,  service
providers  and  contractors  to  comply  with  federal,  state  or  foreign  laws  or  regulation,  our  internal  policies  and  procedures  or  our  contracts  governing
processing of personal information could result in negative publicity, diversion of management time and effort and proceedings against us by governmental
entities or others. In many jurisdictions, enforcement actions and consequences for noncompliance are rising.

In the United States, HIPAA imposes privacy, security and breach reporting obligations with respect to individually identifiable health information upon
“covered  entities”  (health  plans,  health  care  clearinghouses  and  certain  health  care  providers),  and  their  respective  business  associates,  individuals  or
entities that create, receive, maintain or transmit protected health information in connection with providing a service for or on behalf of a covered entity.

HIPAA  mandates  the  reporting  of  certain  breaches  of  health  information  to  the  U.S.  Department  of  Health  and  Human  Services,  or  HHS,  affected
individuals and if the breach is large enough, the media. Entities that are found to be in violation of HIPAA as the result of a breach of unsecured protected
health  information,  a  complaint  about  privacy  practices  or  an  audit  by  HHS,  may  be  subject  to  significant  civil,  criminal  and  administrative  fines  and
penalties and/or additional reporting and oversight obligations if required to enter into a resolution agreement and corrective action plan with HHS to settle
allegations of HIPAA non-compliance. Even when HIPAA does not apply, according to the Federal Trade Commission, or the FTC, violating consumers’
privacy rights or failing to take appropriate steps to keep consumers’ personal information secure may constitute unfair acts or practices in or affecting
commerce in violation of Section 5(a) of the FTC Act. The FTC expects a company’s data security measures to be reasonable and appropriate in light of the
sensitivity and volume of consumer information it holds, the size and complexity of its business, and the cost of available tools to improve security and
reduce vulnerabilities. Individually identifiable health information is considered sensitive data that merits stronger safeguards.

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In addition, certain state laws govern the privacy and security of personal information, including health-related information, in certain circumstances, some
of which are more stringent than HIPAA and many of which differ from each other in significant ways and may not have the same effect, thus complicating
compliance  efforts.  Failure  to  comply  with  these  laws,  where  applicable,  can  result  in  the  imposition  of  significant  civil  and/or  criminal  penalties  and
private litigation. For example, California enacted the California Consumer Privacy Act, or the CCPA, on June 28, 2018, which went into effect on January
1,  2020.  The  CCPA  gives  California  residents  expanded  rights  to  access  and  delete  their  personal  information,  opt  out  of  certain  personal  information
sharing, and receive detailed information about how their personal information is used. The CCPA provides for civil penalties for violations, as well as a
private  right  of  action  for  data  breaches  that  is  expected  to  increase  data  breach  litigation.  The  CCPA  may  increase  our  compliance  costs  and  potential
liability. Some observers have noted that the CCPA could mark the beginning of a trend toward more stringent privacy legislation in the United States,
which could increase our potential liability and adversely affect our business. Further, the California Privacy Rights Act, or the CPRA, recently passed in
California as well. The CPRA will impose additional data protection obligations on covered businesses, including additional consumer rights processes,
limitations on data uses, new audit requirements for higher risk data, and opt outs for certain uses of sensitive data. It will also create a new California data
protection agency authorized to issue substantive regulations and could result in increased privacy and information security enforcement. The majority of
the provisions will go into effect on January 1, 2023, and additional compliance investment and potential business process changes may be required.

Our  operations  abroad  may  also  be  subject  to  increased  scrutiny  or  attention  from  data  protection  authorities.  Many  countries  in  these  regions  have
established or are in the process of establishing privacy and data security legal frameworks with which we, our collaborators, service providers, including
our CRO, and contractors must comply. For example, the European Union General Data Protection Regulation, or GDPR, went into effect in May 2018 and
imposes strict requirements for processing the personal information of subjects within the European Economic Area, or EEA, including clinical trial data.
Further, applicable privacy laws and court decisions could impact our ability to transfer personal data internationally. Recent legal developments in Europe
have created complexity and compliance uncertainty regarding certain transfers of personal data from the EEA. For example, on July 16, 2020, the Court of
Justice of the European Union, or the CJEU, invalidated the EU-U.S. Privacy Shield Framework, or the Privacy Shield, under which personal data could be
transferred from the EEA to United States entities who had self-certified under the Privacy Shield scheme, and imposed further restrictions on use of the
standard contractual clauses, or SCCs. As a result, the Privacy Shield is no longer a valid mechanism for transferring personal data from the EEA to the
United States. The SCC restrictions include a requirement for companies to carry out a transfer impact assessment which, among other things, assesses the
laws governing access to personal data in the recipient country and considers whether supplementary measures that provide privacy protections additional
to those provided under SCCs will need to be implemented to ensure an essentially equivalent level of data protection to that afforded in the EEA. The
European Commission issued revised SCCs on June 4, 2021 to account for the decision of the CJEU and recommendations made by the European Data
Protection  Board.  The  revised  SCCs  must  be  used  for  relevant  new  data  transfers  from  September  27,  2021;  existing  standard  contractual  clauses
arrangements must be migrated to the revised clauses by December 27, 2022. There is some uncertainty around whether the revised clauses can be used for
all types of data transfers, particularly whether they can be relied on for data transfers to non-EEA entities subject to the GDPR. The GDPR has and will
continue to increase compliance burdens on us, including by mandating potentially burdensome documentation requirements and granting certain rights to
individuals to control how we collect, use, disclose, retain and process information about them. The processing of sensitive personal data, such as health
data, may impose heightened compliance burdens under the GDPR and is a topic of active interest among foreign regulators.

In  addition,  the  GDPR  provides  for  more  robust  regulatory  enforcement  and  fines  of  up  to  €20  million  or  4%  of  the  annual  global  revenue  of  the
noncompliant company, whichever is greater. Further, beginning January 1, 2021, we may have to comply with the GDPR and also the United Kingdom
GDPR, or UK GDPR, which, together with the amended UK Data Protection Act 2018, retains the GDPR in United Kingdom national law. The UK GDPR
mirrors the fines under the GDPR, i.e. fines up to the greater of €20 million (£17.5 million) or 4% of global turnover. The relationship between the United
Kingdom  and  the  European  Union  in  relation  to  certain  aspects  of  data  protection  law  remains  unclear,  and  it  is  unclear  how  United  Kingdom  data
protection laws and regulations will develop in the medium to longer term. The European Commission has adopted an adequacy decision in favor of the
United Kingdom, enabling data transfers from EU member states to the United Kingdom without additional safeguards.

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However,  the  UK  adequacy  decision  will  automatically  expire  in  June  2025  unless  the  European  Commission  re-assesses  and  renews/  extends  that
decision.

We incur increased costs as a result of operating as a public company, and our management devote substantial time to new compliance initiatives. We
may  fail  to  comply  with  the  rules  that  apply  to  public  companies,  including  Section  404  of  the  Sarbanes-Oxley  Act  of  2002,  which  could  result  in
sanctions or other penalties that would harm our business.

We have incurred and will continue to incur significant legal, accounting and other expenses as a public company, including costs resulting from public
company reporting obligations under the Exchange Act and regulations regarding corporate governance practices. The listing requirements of the Nasdaq
Global Select Market and the rules of the Securities and Exchange Commission, or SEC, require that we satisfy certain corporate governance requirements
relating to director independence, filing annual and interim reports, stockholder meetings, approvals and voting, soliciting proxies, conflicts of interest and
a code of conduct. Our management and other personnel have devoted and will need to devote a substantial amount of time to ensure that we comply with
all of these requirements. Moreover, the reporting requirements, rules and regulations will increase our legal and financial compliance costs and will make
some activities more time-consuming and costlier. Any changes we make to comply with these obligations may not be sufficient to allow us to satisfy our
obligations  as  a  public  company  on  a  timely  basis,  or  at  all.  These  reporting  requirements,  rules  and  regulations,  coupled  with  the  increase  in  potential
litigation exposure associated with being a public company, could also make it more difficult for us to attract and retain qualified persons to serve on our
board of directors or board committees or to serve as executive officers, or to obtain certain types of insurance, including directors’ and officers’ insurance,
on acceptable terms.

We  are  subject  to  Section  404  of  The  Sarbanes-Oxley  Act  of  2002,  or  Section  404,  and  the  related  rules  of  the  SEC,  which  generally  require  our
management and independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting. Section 404
requires  an  annual  management  assessment  of  the  effectiveness  of  our  internal  control  over  financial  reporting.  However,  for  so  long  as  we  remain  an
emerging growth company as defined in the JOBS Act, we intend to take advantage of certain exemptions from various reporting requirements that are
applicable  to  public  companies  that  are  not  emerging  growth  companies,  including,  but  not  limited  to,  not  being  required  to  comply  with  the  auditor
attestation requirements of Section 404. Once we are no longer an emerging growth company or, if prior to such date, we opt to no longer take advantage of
the applicable exemption, we will be required to include an opinion from our independent registered public accounting firm on the effectiveness of our
internal controls over financial reporting.

During  the  course  of  our  review  of  our  internal  controls  we  may  identify  deficiencies  in  our  internal  controls  that  we  must  remediate.  If  we  identify  a
material  weakness  in  our  internal  controls  over  financial  reporting,  we  may  not  detect  errors  on  a  timely  basis  and  our  financial  statements  may  be
materially  misstated.  We  or  our  independent  registered  public  accounting  firm  may  not  be  able  to  conclude  on  an  ongoing  basis  that  we  have  effective
internal control over financial reporting, which could harm our operating results, cause investors to lose confidence in our reported financial information
and cause the trading price of our stock to fall. In addition, as a public company we will be required to file accurate and timely quarterly and annual reports
with the SEC under the Exchange Act. In order to report our results of operations and financial statements on an accurate and timely basis, we will depend
in part on CROs to provide timely and accurate notice of their costs to us. Any failure to report our financial results on an accurate and timely basis could
result in sanctions, lawsuits, delisting of our shares from The Nasdaq Global Select Market or other adverse consequences that would materially harm to
our business.

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

We  are  an  “emerging  growth  company,”  as  defined  in  the  JOBS  Act,  and  we  intend  to  take  advantage  of  certain  exemptions  from  various  reporting
requirements  that  are  applicable  to  other  public  companies  that  are  not  emerging  growth  companies  including,  but  not  limited  to,  not  being  required  to
comply with the auditor attestation requirements of Section 404, reduced disclosure obligations regarding executive compensation in our periodic reports
and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval
of any golden parachute payments not previously approved. In addition, as an “emerging growth company” the JOBS Act allows us to delay adoption of
new or revised accounting

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pronouncements applicable to public companies until such pronouncements are made applicable to private companies. We have elected to use this extended
transition period under the JOBS Act. As a result, our financial statements may not be comparable to the financial statements of issuers who are required to
comply  with  the  effective  dates  for  new  or  revised  accounting  standards  that  are  applicable  to  public  companies,  which  may  make  comparison  of  our
financials to those of other public companies more difficult.

We cannot predict if investors will find our common stock less attractive because we will rely on these exemptions. If some investors find our common
stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile. We may take
advantage  of  these  reporting  exemptions  until  we  are  no  longer  an  emerging  growth  company.  Even  after  we  no  longer  qualify  as  an  emerging  growth
company, we may still qualify as a “smaller reporting company” which may allow us to take advantage of many of the same exemptions from disclosure
requirements including not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act. We will remain
an emerging growth company until the earlier of (1) the last day of the year following the fifth anniversary of the consummation of our IPO, (2) the last day
of  the  year  in  which  we  have  total  annual  gross  revenue  of  at  least  $1.07  billion,  (3)  the  last  day  of  the  year  in  which  we  are  deemed  to  be  a  “large
accelerated filer” as defined in Rule 12b-2 under the Exchange Act, which would occur if the market value of our common stock held by non-affiliates
exceeded $700.0 million as of the last business day of the second fiscal quarter of such year or (4) the date on which we have issued more than $1.0 billion
in non-convertible debt securities during the prior three-year period.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Our  corporate  headquarters  are  located  in  South  San  Francisco,  California,  where  we  currently  lease  approximately  62,000  square  feet  of  office  and
laboratory space pursuant to a lease dated February 28, 2019, of which approximately 23,000 square feet was subleased to Freenome Holdings, Inc. as of
June 2021 through August 31, 2024. The majority of our employees work at our corporate headquarters.

Item 3. Legal Proceedings.

We are not currently a party to any material litigation or other material legal proceedings.

Item 4. Mine Safety Disclosures.

Not applicable.

78

 
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market Information for Common Stock

PART II

Our common stock has been listed on the Nasdaq Global Select Market under the symbol “UBX” since May 3, 2018. As of March 1, 2022, there were 54
holders of record of our common stock. Because many of our shares of common stock are held by brokers and other institutions on behalf of stockholders,
we are unable to estimate the total number of beneficial owners of our common stock represented by these record holders.

Dividend Policy

We have never declared or paid any cash dividends on our common stock or any other securities. We anticipate that we will retain all available funds and
any future earnings, if any, for use in the operation of our business and do not anticipate paying cash dividends in the foreseeable future. In addition, future
debt  instruments  may  materially  restrict  our  ability  to  pay  dividends  on  our  common  stock.  Payment  of  future  cash  dividends,  if  any,  will  be  at  the
discretion of the board of directors after taking into account various factors, including our financial condition, operating results, current and anticipated
cash needs, the requirements of current or then-existing debt instruments and other factors the board of directors deems relevant.

79

 
Performance Graph

This graph is not “soliciting material” or deemed “filed” with the SEC for purposes of Section 18 of the Exchange Act, or otherwise subject to liabilities
under that Section, and shall not be deemed incorporated by reference into any filing of Unity Biotechnology, Inc. under the Securities Act of 1933, as
amended (the “Securities Act”), whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.

The following graph compares the cumulative total return on our common stock relative to the cumulative total returns of the Nasdaq Composite Index and
the Nasdaq Biotechnology Index. Pursuant to applicable Securities and Exchange Commission rules, all values assume reinvestment of the full amount of
all dividends, however no dividends have been declared on our common stock to date. The stockholder returns shown on the graph below are based on
historical results and are not necessarily indicative of future performance, and we do not make or endorse any predictions as to future stockholder returns.

Sales of Unregistered Securities

There were no sales of unregistered securities during the year ended December 31, 2021.

Repurchase of Shares or of Company Equity Securities

None.

Item 6. [Reserved]

80

 
 
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  the  section  entitled  “Selected
Financial Data” and our audited financial statements and related notes included elsewhere in this report. This discussion and other parts of this report
contain  forward-looking  statements  that  involve  risks  and  uncertainties,  such  as  our  plans,  objectives,  expectations,  intentions  and  beliefs.  Our  actual
results could differ materially from those discussed in these forward-looking statements. Factors that could cause or contribute to such differences include,
but are not limited to, those identified below and those discussed in the section entitled “Risk Factors” included elsewhere in this report.

Overview

We are a biotechnology company engaged in researching and developing therapeutics to slow, halt, or reverse diseases of aging. Our initial focus is on
creating senolytic medicines to selectively eliminate senescent cells and thereby treat diseases of aging, such as ophthalmologic diseases.

In July 2020, we filed an Investigational New Drug application, or IND, to commence a Phase 1, first-in-human, open-label, single-ascending dose study of
UBX1325 in patients with advanced diabetic macular edema, or DME, and neovascular age-related macular degeneration, or nAMD. UBX1325 is a potent
small molecule inhibitor of the anti-apoptotic Bcl-2 family member, Bcl-xL, a member of the Bcl-2 family of apoptosis-regulatory proteins. Our goal with
UBX1325  is  to  transformationally  improve  real-world  outcomes  for  patients  with  DME,  nAMD,  and  diabetic  retinopathy,  or  DR.  In  October  2020,  we
dosed our first patient in a Phase 1 clinical study of UBX1325 to evaluate ocular and systemic safety and tolerability of a single intravitreal injection of
UBX1325  by  the  incidence  of  dose  limiting  toxicities  and  treatment  emergent  adverse  events  reported  up  to  24  weeks  after  administration.  Based  on
prospectively  determined  safety  criteria,  the  Phase  1  study  was  able  to  dose-escalate  beyond  the  originally  planned  5  mcg  dose  up  to  10  mcg,  which
informed the final dose for the Phase 2a study in DME. In July 2021, we announced positive data from this Phase 1 study of UBX1325 in patients with
DME and nAMD for whom anti-VEGF therapy was no longer considered beneficial. On October 5, 2021 we announced 12-week data, on November 9,
2021  we  announced  24-week  data,  and  on  February  14,  2022  we  announced  24-week  data  from  an  additionally-enrolled  cohort  of  patients  with  AMD.
UBX1325 was well-tolerated with no signs of intraocular inflammation or other related ocular adversities, and no dose-limiting toxicities or adversities that
preclude  advancing  UBX1325  into  later  stage  clinical  development.  In  DME,  following  a  rapid  improvement  in  BCVA,  a  mean  improvement  of  9.5
ETDRS letters from baseline at 6 months in the higher dose cohorts (5, 10 mcg) and 6.9 ETDRS letters from baseline at 6 months in all dose cohorts was
observed. In AMD, following a rapid improvement in BCVA, there were improvements or stabilization of both BCVA and CST through 6 months post-
injection. In both diseases, the majority of patients treated with UBX1325 showed durable improvement in vision and did not meet objective rescue criteria
requiring standard of care anti-VEGF treatment. Among patients who received anti-VEGF rescue, there was minimal change in either mean BCVA or CST
following treatment in all but one patient.

In May 2021, we initiated our Phase 2a proof-of-concept study to evaluate the safety, efficacy, and durability of a single intravitreal injection of UBX1325
in a broader population of patients with DME and dosed our first patient in June 2021. Approximately 62 patients will be enrolled, randomized evenly
between UBX1325 and sham-injected patients. An analysis of 12-week safety and efficacy data is expected by mid-2022, and patients will continue to be
followed  through  48  weeks  post-treatment  in  a  long-term  follow-up.  Endpoints  being  explored  in  the  study  include  safety  and  tolerability,  changes  in
BCVA, CST, SRF/IRF, proportion of patients requiring rescue treatment, and durability of effects.

In March 2022 we also enrolled our first patient in our Phase 2 proof-of-concept study in nAMD. This study is expected to randomize 46 patients with wet
AMD who have had at least three intravitreal injections of anti-VEGF therapy in the preceding six months and who have residual sub- or intra-retinal fluid.
Patients will have received their last anti-VEGF treatment approximately 4-8 weeks prior to screening, and all patients will be followed for approximately
24 weeks after dosing with either UBX1325 or aflibercept. We expect to share 16-week data from this Ph2 study in wet AMD in the fourth quarter of 2022.

81

 
 
 
 
 
 
 
In February 2022, we announced a restructuring to align resources to focus on our ongoing clinical programs and deliver on key development milestones.
These actions to prioritize our ophthalmology programs and implement cost saving measures were designed to enable us to achieve multiple key clinical
data readouts for UBX1325 as well as support the Tie2 and Tie2/VEGF bispecific program through advanced candidate nomination, with all other pipeline
programs paused to focus resources on these advanced programs.

Since  the  commencement  of  our  operations,  we  have  invested  a  significant  portion  of  our  efforts  and  financial  resources  in  research  and  development
activities, and we have incurred net losses each year since inception. Our net losses were $60.7 million and $93.8 million for the years ended December 31,
2021 and 2020, respectively. We do not have any products approved for sale, and we have never generated any revenue from contracts with customers. As
of  December  31,  2021,  we  had  an  accumulated  deficit  of  $400.0  million,  and  we  do  not  expect  positive  cash  flows  from  operations  in  the  foreseeable
future.

Substantially  all  of  our  net  losses  have  resulted  from  costs  incurred  in  connection  with  our  research  and  development  programs  and  from  general  and
administrative costs associated with our operations. Based on our current operating plans, we expect our existing capital resources will fund our planned
operating expenses into the first quarter of 2023 which is expected to fund key clinical data readouts for UBX1325, but less than 12 months from the date
of this Annual Report. As a result, we will need to raise additional capital. Adequate funding may not be available to us on acceptable terms, or at all,
particularly in light of the current COVID-19 pandemic and associated economic uncertainty and potential for local and/or global economic recession. If
sufficient funds on acceptable terms are not available when needed, we could be required to significantly reduce our operating expenses and delay, reduce
the scope of, or eliminate one or more of our development programs.

We expect to continue to incur net operating losses for at least the next several years as we continue our research and development efforts, advance our
drug candidates through preclinical and clinical development, seek regulatory approval, prepare for and, if approved, proceed to commercialization. We do
not expect to generate revenue from any drug candidates that we develop until we obtain regulatory approval for one or more of such drug candidates and
commercialize our products or enter into collaborative agreements with third parties.

We rely on third parties in the conduct of our preclinical studies and clinical trials and for manufacturing and supply of our drug candidates. We have no
internal manufacturing capabilities, and we will continue to rely on third parties, many of whom are single-source suppliers, for our preclinical and clinical
trial  materials,  as  well  as  the  commercial  supply  of  our  products.  In  addition,  we  do  not  yet  have  a  marketing  or  sales  organization  or  commercial
infrastructure. Accordingly, we will incur significant expenses to develop a marketing and sales organization and commercial infrastructure in advance of
generating any product sales.

COVID-19 Update

The COVID-19 pandemic has placed strains on the providers of healthcare services, including the healthcare institutions, clinical research organizations, or
CROs, and Institutional Review Boards under whose auspices we conduct our clinical trials. These strains have resulted in limits on the initiation of new
clinical  trials,  slowing  or  halting  enrollment  in  existing  trials  and  restrictions  placed  upon  on-site  monitoring  activities  of  clinical  trials.  Prior  to  the
initiation of our Phase 1 and Phase 2 studies of UBX1325, we amended the clinical study protocols to enable remote data collection for clinical sites that
were limited in their ability to conduct study visits in person, for either site or patient safety reasons. We also instituted remote data source verification
procedures to limit the extent that on-site monitoring was required.

Although we rely on third party manufacturers to supply UBX1325, there have been no disruptions in our supply chain of drug manufacturers necessary to
conduct our Phase 1 and Phase 2 studies of UBX1325, and we believe we have sufficient supply of drug inventories to complete our current studies in
ophthalmologic disease.

In  late  February  2020,  we  created  an  internal,  cross-functional  COVID-19  Response  Team  to  closely  monitor  the  evolving  situation  and  manage  our
response in compliance with applicable federal, state, and local guidance. We have implemented protocols designed to reduce onsite staff, increased testing
and monitoring, facilitated remote working and will continue to monitor the situation and plan for re-entry as permitted by applicable laws or regulations
and consistent with the best interests of our employees and business needs.

82

 
 
 
 
 
 
 
 
 
 
Components of Our Results of Operations

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for the development of our drug candidates, which include:

•

•

•

•

•

•

personnel-related  expenses,  including  salaries,  benefits,  severance  and  stock-based  compensation  for  personnel  contributing  to  research
and development activities;

laboratory expenses including supplies and services;

clinical trial expenses;

expenses incurred under agreements with third-party contract manufacturing organizations, contract research organizations, research and
development service providers, academic research institutions, and consultants;

expenses related to license and sponsored research agreements; and

facilities and other allocated expenses, including expenses for rent and facilities maintenance, and depreciation and amortization.

We expect our research and development expenses to increase as we advance our drug candidates into and through preclinical and clinical trials
and pursue regulatory approval of our drug candidates. The process of conducting the clinical trials required to obtain regulatory approval is costly and time
consuming. Clinical trials generally become larger and more costly to conduct as they advance into later stages and we are required to make estimates for
expense  accruals  related  to  clinical  trial  expenses.  The  actual  probability  of  success  for  our  drug  candidates  may  be  affected  by  a  variety  of  factors
including:  the  safety  and  efficacy  of  our  drug  candidates,  early  clinical  data,  investment  in  our  clinical  program,  the  ability  of  collaborators,  if  any,  to
successfully develop any drug candidates we license to them, competition, manufacturing capability and commercial viability. We may never succeed in
achieving regulatory approval for any of our drug candidates. Program costs that are direct external expenses are tracked on a program-by-program basis
once  they  enter  clinical  studies.  As  a  result  of  the  uncertainties  discussed  above,  we  are  unable  to  determine  the  duration  and  completion  costs  of  our
research and development projects or when and to what extent we will generate revenue from the commercialization and sale of our drug candidates.

General and Administrative Expenses

Our  general  and  administrative  expenses  consist  primarily  of  personnel  costs,  allocated  facilities  costs  and  other  expenses  for  outside
professional  services,  including  legal,  audit  and  accounting  services,  and  depreciation  and  amortization  expense  related  to  property  and  equipment.
Personnel costs consist of salaries, benefits, severance, and stock-based compensation. We expect to continue to incur additional expenses associated with
operating as a public company, including expenses related to compliance with the rules and regulations of the Securities and Exchange Commission and
standards  applicable  to  companies  listed  on  a  national  securities  exchange,  additional  insurance  expenses,  investor  relations  activities,  and  other
administrative and professional services.

Change Fair Value of Contingent Consideration

Certain  of  our  license  agreements  include  contingent  consideration  in  the  form  of  additional  issuances  of  our  common  stock  based  on  the
achievement of certain milestones. For asset acquisitions, we assess whether such contingent consideration obligation meets the definition of a derivative
and/or can be equity classified, until such time that the contingency or equity classification criteria is met or expires. We have recorded a liability related to
contingent consideration as the net settlement criteria of the definition of a derivative had been met and equity classification criteria had not been met. The
derivative  related  to  this  contingent  consideration  was  measured  at  fair  value  as  of  each  balance  sheet  date  with  the  related  change  in  fair  value  being
reflected in operating results. Gains or

83

 
 
 
 
 
 
 
 
 
 
 
losses  on  contingent  consideration  expense  is  driven  by  changes  in  the  estimated  fair  value  of  the  liability,  which  is  determined  using  a  probability-
weighted valuation approach model that reflects the probability and timing of future issuances of our common shares.

Interest Income

Interest income is primarily related to interest earned on our marketable securities for the years ended December 31, 2021, 2020 and 2019.  

Interest Expense

Interest expense relates to interest on the Loan Agreement entered into during the year ended December 31, 2020.

Other Income (Expense), Net

We  held  an  equity  investment  in  an  entity  called  Ascentage  Pharma  Group  International,  or  Ascentage  International,  an  affiliate  of  a  Hong
Kong  based  clinical-stage  biopharmaceutical  company  called  Ascentage  Pharma  Group  Corp.  Limited.  In  October  2019,  Ascentage  International
completed an initial public offering of shares of its common stock on the Hong Kong Stock Exchange. Following the initial public offering, the underlying
nature of our investment in Ascentage International changed and met the definition of an investment in an equity security with a readily determinable fair
value to be measured at fair value on a recurring basis, based on quoted stock prices available on the Hong Kong Stock Exchange. During the year ended
December  31,  2020,  we  sold  our  entire  equity  investment  in  Ascentage  International.  Other  expense  in  2020  includes  the  recognized  gains  and  losses
resulting  from  the  sale  of  the  investment  in  this  equity  security  and  the  previous  changes  in  fair  value,  while  other  expense  in  2021  includes  the
commitment share expenses related to the equity purchase agreement with Lincoln Park Capital Fund and the debt extinguishment loss from the conversion
of debt to equity.

Results of Operations

Comparison of the Years Ended December 31, 2021 and 2020

The following table sets forth the significant components of our results of operations (in thousands):

Summary of Operations Data:
Licensing revenue – related party
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Interest income
Interest expense
Other income (expense), net
Net loss

Year Ended December 31,
2020
2021

Change

  $

4,784 

 $

— 

 $

4,784 

38,393     
23,056     
—     
—     
61,449     
(56,665)    
100     
(3,177)    
(983)    
(60,725)   $

67,309     
24,025     
(33)    
2,629     
93,930     
(93,930)    
1,196     
(1,292)    
182     
(93,844)   $

(28,916)
(969)
33 
(2,629)
(32,481)
37,265 
(1,096)
(1,885)
(1,165)
33,119

  $

84

 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
      
      
  
   
      
      
  
   
   
   
   
   
   
   
   
   
 
Licensing Revenue – Related Party

In  December  2021,  we  entered  into  a  licensing  agreement  with  Jocasta  Neuroscience,  Inc.  (“Jocasta”)  pursuant  to  which  we  exclusively
licensed  all  of  our  rights  to  UBX2089,  our  α-Klotho  asset.  The  agreement  provided  for  an  upfront  fee  of  $5.0  million.  Revenue recognized in the year
ended  December  31,  2021  was  related  to  grant  of  license  and  delivery  of  the  know-how  performance  obligation  under  the  License  Agreement.  We
recognized revenue of $4.8 million and zero for the years ended December 31, 2021 and 2020. Revenue recognized in the year ended December 31, 2021
was related to grant of license and delivery of the know-how performance obligation under the License Agreement entered into with Jocasta in December
2021.

Research and Development

Research and development expenses decreased by $28.9 million, to $38.4 million for the year ended December 31, 2021 from $67.3 million for
the year ended December 31, 2020. The decrease was primarily due to decreases of $11.9 million in direct research and development expenses mainly due
to termination of Osteoarthritis studies and decreased safety studies, $10.2 million in personnel costs due to reduction in force, $3.8 million in facilities-
related  costs  primarily  due  to  allocation  to  general  and  administrative  expenses  of  net  expenses  on  Brisbane  and  East  Grand  facilities  which  have  been
subleased, $2.5 million in laboratory supplies and $0.5 million in consultant expenses.

General and Administrative

General and administrative expenses decreased by $1.0 million, to $23.0 million for the year ended December 31, 2021 from $24.0 million for
the  year  ended  December  31,  2020.  The  decrease  was  primarily  due  to  decreases  of  $0.8  million  in  professional  fees,  $0.3  million  in  personnel-related
expenses and $0.1 million in facilities-related costs, offset by $0.2 million increase in insurance-related expense.

Change in Fair Value of Contingent Consideration

There was no contingent consideration liability at December 31, 2021 and 2020. The change in fair value of contingent consideration was

immaterial for the year ended December 31, 2020, and was primarily due to changes in our stock price.

Impairment of Long-Lived Assets

Impairment charges consisted of impairment of long-lived assets. There were no impairment charges during the year ended December 31, 2021.
During the year ended December 31, 2020, we recorded an impairment charge of $2.6 million after evaluating the right-of-use asset and related leasehold
improvements upon exit of our former headquarters located in Brisbane, California.

Interest Income

Our interest income was $0.1 million for the year ended December 31, 2021, as compared to $1.2 million for the year ended December 31,

2020. The decrease is primarily attributable to lower market yields and cash balances on the Company’s cash equivalents and marketable securities.

Interest Expense

Our interest expense of $3.2 million and $1.3 million for the years ended December 31, 2021 and 2020, respectively, is related to the Loan

Agreement.

85

 
 
 
 
 
 
 
 
 
Other Income (Expense), Net

Other expense, net, was $1.0 million for the year ended December 31, 2021 which includes $0.8 million commitment share expenses related to
the equity purchase agreement with Lincoln Park Capital Fund and $0.3 million property and other tax expense, offset by $0.2 million gain from the debt
extinguishment from the conversion of debt to equity and the sale of assets. Other income, net, was $0.2 million for the year ended December 31, 2020 and
was primarily due to the change in the fair value of our investment in the common stock of Ascentage International. The entire investment was sold in
2020.

Comparison of the years ended December 31, 2020 and 2019

The following table sets forth the significant components of our results of operations (in thousands):

Summary of Operations Data:
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Interest income
Interest expense
Other income (expense), net
Net loss

Year Ended December 31,
2019
2020

Change

  $

  $

67,309    $
24,025     
(33)    
2,629     
93,930     
(93,930)    
1,196     
(1,292)    
182     
(93,844)   $

70,957    $
20,046     
(1,352)    
—     
89,651     
(89,651)    
3,289     
—     
4,185     
(82,177)   $

(3,648)
3,979 
1,319 
2,629 
4,279 
(4,279)
(2,093)
(1,292)
(4,003)
(11,667)

Research and Development

Research and development expenses decreased by $3.6 million, to $67.3 million for the year ended December 31, 2020 from $70.9 million for
the year ended December 31, 2019. The decrease was primarily due to a decrease of $5.3 million in direct research and development expenses mainly due
to lower pre-clinical research and development activities and contract manufacturing costs, partially offset by higher costs from clinical programs started in
late 2019. Laboratory supplies decreased by $1.9 million and facilities-related costs increased by $2.2 million.  Personnel-related expenses increased by
$1.4  million,  of  which  $1.6  million  was  related  to  non-cash  stock  compensation  expense  partially  offset  by  a  decrease  in  payroll  due  to  the  corporate
restructuring and other costs such as travel, due to employees working from home.

General and Administrative

General and administrative expenses increased by $4.0 million, to $24.0 million for the year ended December 31, 2020 from $20.0 million for
the year ended December 31, 2019. The increase was primarily due to increases of $2.0 million in personnel-related expenses, of which $1.4 million was
related  to  non-cash  stock  compensation  expense,  $0.8  million  in  professional  fees,  $0.7  million  in  facilities-related  costs  and  $0.5  million  in  insurance-
related expense.

Change in Fair Value of Contingent Consideration

Change in fair value of contingent consideration reflects a decrease in the contingent consideration liability of $1.3 million for the year ended
December 31, 2020. We issued shares in 2020 as a result of meeting a contractual milestone. The change in the fair value of contingent consideration was
primarily due to changes in assumptions, including probabilities, and our stock price used to calculate the fair value of the liability. Additionally, during the

86

 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
      
      
  
   
      
      
  
   
   
   
   
   
   
   
   
 
 
third quarter of 2020, we made changes to the related contracts, which resulted in there being no contingent consideration liability at December 31, 2020.  

Impairment of Long-Lived Assets

Impairment charges consisted of impairment of long-lived assets. We evaluated the right-of-use asset and related leasehold improvements upon

exit of our former headquarters located in Brisbane, California, and recorded an impairment charge of $2.6 million during the year.

Interest Income

Our interest income was $1.2 million for the year ended December 31, 2020, as compared to $3.3 million for the year ended December 31,

2019. The decrease is primarily attributable to lower market yields and cash balances on the Company’s cash equivalents and marketable securities.

Interest Expense

Our interest expense of $1.3 million for the year ended December 31, 2020 is related to the Loan Agreement.

Other Income (Expense), Net

Other income was $0.2 million for the year ended December 31, 2020, as compared to $4.2 million for the year ended December 31, 2019. The

decrease was primarily due to a change in the fair value of our investment in the common stock of Ascentage International.

Liquidity, Capital Resources and Capital Requirements

Sources of Liquidity

We have incurred net losses each year since inception. We do not have any products approved for sale and have never generated any revenue
from  product  sales.  Historically,  we  have  incurred  operating  losses  as  a  result  of  ongoing  efforts  to  develop  our  drug  candidates,  including  conducting
ongoing research and development, preclinical studies and providing general and administrative support for these operations. Our net losses were $60.7
million and $93.8 million for the years ended December 31, 2021 and 2020, respectively. As of December 31, 2021, we had an accumulated deficit of
$400.0 million, and we do not expect positive cash flows from operations in the foreseeable future. Based on our current operating plans, we expect our
existing capital resources will fund our planned operating expenses into the first quarter of 2023 which is expected to fund key clinical data readouts for
UBX1325,  but  less  than  12  months  from  the  date  of  this  Annual  Report.  We  expect  our  operating  losses  and  net  cash  used  in  operating  activities  will
increase over at least the next several years as we continue our research and development activities, advance our drug candidates through preclinical and
clinical  testing  and  move  into  later  and  more  costly  stages  of  drug  development,  hire  personnel  and  prepare  for  regulatory  submissions  and  the
commercialization of our drug candidates. As a result, we will need to raise additional capital. Adequate funding may not be available to us on acceptable
terms, or at all, particularly in light of the current COVID-19 pandemic and associated economic uncertainty and potential for local and/or global economic
recession. If sufficient funds on acceptable terms are not available when needed, we could be required to significantly reduce our operating expenses and
delay, reduce the scope of, or eliminate one or more of our development programs.

We have historically financed our operations primarily through private placements of preferred stock and promissory notes, as well as public
equity  issuances,  such  as  our  initial  public  offering,  or  IPO,  and  more  recently  through  proceeds  from  our  Loan  Agreement,  the  Initial  ATM  Offering
Program, the Additional ATM Offering Program, the Equity Purchase Agreement and will continue to be dependent upon equity and/or debt financing to
operate our business until we are able to generate positive cash flows from our operations.

87

 
 
 
 
 
 
 
 
In August 2020, we entered into a Loan Agreement with Hercules Capital, Inc. (“Hercules”) pursuant to a term loan, subject to certain terms
and conditions and $25.0 million dollars was advanced to us on the date of execution of the Loan Agreement. The milestones for the remaining tranches
have not yet been reached and, as of December 31, 2021 will not be reached. We will make interest only payments through September 1, 2022 and will
then repay the principal balance and interest in equal monthly installments through August 1, 2024. In December 2021, we entered into an amendment to
our  Loan  and  Security  Agreement  under  the  terms  of  which,  Hercules  (including  any  of  its  assignees)  has  the  option  for  a  period  of  six  (6)  months  to
convert up to $5.0 million of the outstanding principal under the existing loan into shares of our common stock. Under the Loan Amendment, the required
cash  reserve  amount  shall  be  reduced  by  the  principal  amount  of  the  converted  loan  to  not  less  than  $10  million.  As of December 31, 2021, we issued
1,727,361  shares  of  our  common  stock  reducing  our  outstanding  loan  principal  balance  by  $2.3  million.  As  of  February  14,  2022,  the  remaining  $2.7
million of debt principal was converted to equity, and reducing the required cash reserve to $10 million. In addition, the interest only period may extend by
up to a maximum of 9 months to June 1, 2023 should we meet specific milestones related to our clinical trials and raising additional capital.

In June 2019, we filed a Registration Statement on Form S-3, or the Shelf Registration Statement, covering the offering of up to $250.0 million
of common stock, preferred stock, debt securities, warrants and units. The Shelf Registration Statement included an initial prospectus covering the offering,
issuance and sale of up to $75.0 million of our common stock from time to time through an at-the-market offering, or the Initial ATM Offering Program,
under  which  Cowen  acts  as  sales  agent.  In  July  2020,  we  filed  an  additional  prospectus  supplement  to  the  Shelf  Registration  Statement,  covering  the
offering, issuance and sale of up to an additional $50.0 million of our common stock from time to time through an additional at-the-market offering, or the
Additional  ATM  Offering  Program,  under  which  Cowen  acts  as  sales  agent.  During  the  year  ended  December  31,  2021,  we  issued  and  sold  1,187,068
shares of common stock sold through the Initial ATM Offering Program and 707,459 shares of common stock sold through the Additional ATM Offering
Program and received total net proceeds of approximately $10.4 million, after deducting commissions and other offering expenses of $0.3 million. As of
December 31, 2021, no proceeds remained available to be sold under our Initial ATM Offering Program and approximately $48.2 million of Additional
ATM Offering Program proceeds remained available to be sold under our Additional ATM Offering Program.

In September  2021, we entered into a Purchase Agreement with Lincoln Park Capital Fund, LLC, under which we may at our discretion, sell
up to $30.0 million shares of our common stock over a 36-month period, subject to certain daily limits, applicable prices, and conditions. As of December
31, 2021, we had initiated the purchase of 3.9 million shares of our common stock amounting to $8.3 million in gross proceeds. In addition, under the
Purchase  Agreement,  we  issued  252,447  shares  of  our  common  stock  to  Lincoln  Park  as  consideration  for  its  commitment  to  purchase  shares  of  our
common stock under the Purchase Agreement.

Future Funding Requirements

To date we have not generated any revenue from contracts with customers. We expect to continue to incur significant losses for the foreseeable
future,  and  we  expect  the  losses  to  increase  as  we  continue  the  development  of,  and  seek  regulatory  approvals  for,  our  drug  candidates,  and  begin  to
commercialize any approved products. We are subject to all of the risks typically related to the development of new drug candidates, and we may encounter
unforeseen expenses, difficulties, complications, delays, and other unknown factors that may adversely affect our business. Moreover, since becoming a
public company, we continue to incur additional ongoing costs associated with operating as a public company. We anticipate that we will need substantial
additional funding in connection with our continuing operations.

Until we can generate a sufficient amount of revenue from the commercialization of our drug candidates or from collaborative agreements with
third parties, if ever, we expect to finance our future cash needs through various means. Other than our right to cause Lincoln Park to purchase shares of our
common stock under the LPC Purchase Agreement, which is subject to certain limitations and conditions, we do not have any committed external source of
funds. Additional capital may be raised through the sale of our equity securities, incurring debt, entering into licensing or collaboration agreements with
partners, receiving research contributions, grants or other sources of

88

 
 
 
 
 
 
financing to fund our operations. There can be no assurance that sufficient funds will be available to us on attractive terms or at all. If we are unable to
obtain  additional  funding  from  these  or  other  sources,  it  may  be  necessary  to  significantly reduce  our  rate  of  spending  through  reductions  in  staff  and
delaying,  scaling  back,  or  stopping  certain  research  and  development  programs.  Insufficient  liquidity  may  also  require  us  to  relinquish  rights  to  drug
candidates at an earlier stage of development or on less favorable terms than we would otherwise choose.

Based on our current operating plans, we expect our existing capital resources will fund our planned operating expenses into the first quarter of
2023 which is expected to fund key clinical data readouts for UBX1325. We have based our projections of operating capital requirements on assumptions
that may prove to be incorrect and we may use all our available capital resources sooner than we expect. Because of the numerous risks and uncertainties
associated  with  research,  development,  and  commercialization  of  biotechnology  products,  we  are  unable  to  estimate  the  exact  amount  of  our  operating
capital requirements. Our future funding requirements will depend on many factors, including, but not limited to:

•

•

•

•

•

•

•

•

•

•

•

•

•

•

the results of our ongoing clinical trials of UBX1325;

the scope, progress, results and costs of researching and developing our drug candidates, and conducting preclinical studies and clinical studies;

potential delays in or an increase in costs associated with our ongoing or planned preclinical studies or clinical trials as a result of the COVID-
19 pandemic;

the timing of, and the costs involved in, obtaining regulatory approvals for our current drug candidates or any future drug candidates;

the number and characteristics of any additional drug candidates we develop or acquire;

the timing and amount of any milestone payments we are required to make pursuant to our license agreements;

the cost of manufacturing our current drug candidates or any future drug candidates and any products we successfully commercialize;

the expenses needed to attract, hire, and retain skilled personnel;

the cost of commercialization activities if our current drug candidates or any future drug candidates are approved for sale, including marketing,
sales and distribution costs;

our ability to maintain existing, and establish new, strategic collaborations, licensing or other arrangements and the financial terms of any such
agreements, including the timing and amount of any future milestone, royalty or other payments due under any such agreement;

any product liability or other lawsuits related to our products;

the costs associated with being a public company;

the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing our intellectual property portfolio; and

the timing, receipt and amount of sales of any future approved products, if any.

Cash Flows

The following table sets forth a summary of the primary sources and uses of cash and restricted cash for each of the periods presented below (in

thousands):

89

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash used in operating activities
Cash provided by (used in) investing activities
Cash provided by financing activities

Net increase (decrease) in cash and
   restricted cash

2021

Year Ended December 31,
2020

2019

  $

(45,060)   $
39,313     
20,845     

(78,333)   $
(5,208)    
63,875     

(72,421)
67,953 
27,438 

  $

15,098    $

(19,666)   $

22,970

Operating Activities

Cash  used  in  operating  activities  of  $45.1  million  for  the  year  ended  December  31,  2021  consisted  primarily  of  a  net  loss  of  $60.7  million
adjusted for net non-cash charges of $16.3 million and net changes to our operating assets and liabilities of $0.6 million. Our non-cash charges consisted
primarily of $11.6 million in stock-based compensation, $2.9 million in depreciation and amortization, $1.5 million in common stock granted to a third
party, $1.0 million in net accretion and amortization of premium and discounts on marketable securities, $0.8 million in amortization of debt issuance costs
and $0.8 million other expenses related to the equity purchase agreement with Lincoln Park Capital Fund, partially offset by a $2.2 million in non-cash rent
expense  and  $0.1  million  debt  extinguishment  gain  from  conversion  of  debt  to  equity.  The  net  change  in  our  operating  assets  and  liabilities  primarily
consisted of decreases of $1.3 million in accrued compensation, $1.1 million in accrued liabilities and other current liabilities, $0.6 million in accounts
payable  and  increase  of  $0.1  million  in  other  long-term  assets,  partially  offset  by  increases  of  $1.0  million  in  derivative  liability  and  $0.2  million  in
deferred revenue and a decrease of $1.3 million in prepaid expenses and other current assets.

Cash  used  in  operating  activities  of  $78.3  million  for  the  year  ended  December  31,  2020  consisted  primarily  of  a  net  loss  of  $93.8  million
adjusted for net non-cash charges of $20.1 million and net changes to our operating assets and liabilities of $4.6 million. Our non-cash charges consisted
primarily of $13.8 million in stock-based compensation, $3.4 million in depreciation and amortization, $2.6 million in impairment charges pertaining to
leasehold improvements and right of use assets in the Company’s former offices, $1.2 million in common stock granted to a third party, $0.3 million in
amortization of debt issuance costs and $0.3 million in net accretion and amortization of premium and discounts on marketable securities, partially offset
by  a  $1.1  million  in  non-cash  rent  expense  and  $0.5  million  change  in  fair  value  of  strategic  investment.  The  net  change  in  our  operating  assets  and
liabilities consisted of decreases of $2.6 million in accounts payable, $0.9 million in accrued liabilities and other current liabilities, $0.5 million in accrued
compensation and increase of $1.2 million in prepaid expenses and other current assets, partially offset by a decrease of $0.6 million in other long-term
assets.

Cash  used  in  operating  activities  of  $72.4  million  for  the  year  ended  December  31,  2019  consisted  primarily  of  a  net  loss  of  $82.2  million
adjusted for net non-cash charges of $6.2 million and net changes to our operating assets and liabilities of $3.6 million. Our non-cash charges consisted
primarily of $10.9 million in stock-based compensation, $2.7 million in depreciation and amortization and $1.0 million in common stock granted to a third
party, partially offset by a $1.4 million change in fair value of contingent consideration, $1.3 million in accretion of our tenant improvement allowance and
$1.2 million in net accretion and amortization of premium and discounts on marketable securities. The net change in our operating assets and liabilities
consisted of increases of $2.5 million in deferred rent, net of current portion, and $2.1 million in accrued compensation, partially offset by decreases of $0.6
million in accrued liabilities and other current liabilities, $0.2 million in accounts payable and a $0.2 million increase in prepaid expenses and other current
assets.

Investing Activities

Cash provided by investing activities of $39.3 million for the year ended December 31, 2021 was related to maturities of marketable securities

of $121.0 million which were offset by purchases of marketable securities of $81.5 million and purchases of property and equipment of $0.2 million.

90

 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
Cash used in investing activities of $5.2 million for the year ended December 31, 2020  was  related  to  purchases  of  marketable  securities  of
$138.5 million and purchases of property and equipment of $0.6 million, which were offset by maturities of marketable securities of $127.9 million and the
sale of our strategic investment of $6.0 million.

Cash provided by investing activities of $68.0 million for the year ended December 31, 2019 was related to maturities of marketable securities

of $188.8 million which were offset by purchases of marketable securities of $119.3 million and purchases of property and equipment of $1.6 million.

Financing Activities

Cash provided by financing activities of $20.8 million for the year ended December 31, 2021 was related to $10.4 million in proceeds from the
sale of common stock through our ATM Offering Program, net of issuance costs, $8.2 million in proceeds from issuance of common stock to Lincoln Park
Capital  Fund,  net  of  issuance  costs,  $1.8  million  in  proceeds  from  issuance  of  common  stock  upon  exercise  of  stock  options,  net  of  repurchases,  $0.3
million in proceeds from the issuance of common stock under the 2018 Employee Stock Purchase Plan and $0.2 million in proceeds from the repayment of
employee promissory note, partially offset by $0.1 million current portion of long-term debt arrangement.

Cash provided by financing activities of $63.9 million for the year ended December 31, 2020 was related to $37.3 million in proceeds from the
sale of common stock through our ATM Offering Program, net of issuance costs, $24.2 million in proceeds from long-term debt, net of issuance costs, $1.5
million  in  proceeds  from  issuance  of  common  stock  upon  exercise  of  stock  options,  net  of  repurchases,  $0.6  million  in  proceeds  from  the  issuance  of
common stock under the 2018 Employee Stock Purchase Plan, and $0.4 million in proceeds from the repayment of promissory notes from an employee.

Cash provided by financing activities of $27.4 million for the year ended December 31, 2019 was related to $26.1 million in proceeds from the
sale of common stock through our ATM Offering Program, net of issuance costs, $0.8 million in proceeds from the issuance of common stock under the
2018 Employee Stock Purchase Plan and proceeds from issuance of common stock upon exercise of stock options, net of repurchases, of $0.6 million.

Contractual Obligations and Other Commitments

Our  contractual  obligations  and  commitments  relate  primarily  to  our  Loan  Agreement,  operating  leases  and  non-cancelable  purchase
obligations under agreements with various research and development organizations and suppliers in the ordinary course of business. In February 2019, we
entered into a lease agreement for new office and laboratory space in South San Francisco, California. See Note 7, “Commitments and Contingencies” and
Note 8, “Term Loan Facility,” to our financial statements for further information.

We are party to various license agreements pursuant to which we have in-licensed rights to various technologies, including patents, research
“know-how”  and  proprietary  research  tools,  for  the  discovery,  research,  development  and  commercialization  of  drug  candidates  to  treat  age-related
diseases. The license agreements obligate us to make certain milestone payments related to specified clinical development and sales milestone events, as
well as tiered royalties in the low-single digits based on sales of licensed products. See Note 5 to our financial statements “License Revenue, Agreements
and Strategic Investment” for additional information.

Indemnification

In the normal course of business, we enter into contracts and agreements that contain a variety of representations and warranties and provide for
general indemnifications. Our exposure under these agreements is unknown because it involves claims that may be made against us in the future but have
not yet been made. To date, we have not paid any claims or been required to defend any action related to our indemnification obligations. However, we may
record charges in the future as a result of these indemnification obligations.

In accordance with our certificate of incorporation and bylaws, we have potential indemnification obligations to our officers and directors for

specified events or occurrences, subject to some limits, while they are

91

 
serving at our request in such capacities. There have been no claims to date, and we have director and officer insurance that may enable us to recover a
portion of any amounts paid for future potential claims.

Off-Balance Sheet Arrangements

We have not entered into any off-balance sheet arrangements.

Critical Accounting Policies and Estimates

This discussion and analysis of our financial condition and results of operations is based on our financial statements, which have been prepared
in accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of these financial statements requires us to
make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of
the financial statements, as well as the reported expenses incurred during the reporting periods. These items are monitored and analyzed by us for changes
in facts and circumstances, and material changes in these estimates could occur in the future. Our estimates are based on our historical experience and on
various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying
value of assets and liabilities that are not readily apparent from other sources. Changes in estimates are reflected in reported results for the period in which
they become known. Actual results may differ from these estimates under different assumptions or conditions.

While  our  significant  accounting  policies  are  described  in  more  detail  in  the  notes  to  our  financial  statements  included  elsewhere  in  this
prospectus, we believe that the following accounting policies are critical to understanding our historical and future performance, as these policies relate to
the more significant areas involving management’s judgments and estimates.

Research and Development Expenses and Accruals

Costs  related  to  research  and  development  of  drug  candidates  are  charged  to  research  and  development  expense  as  incurred.  Research  and
development  costs  include,  but  are  not  limited  to,  payroll  and  personnel  expenses  for  personnel  contributing  to  research  and  development  activities,
laboratory supplies, outside services, licenses acquired to be used in research and development, manufacturing of clinical material, pre-clinical testing and
consultants and allocated overhead, including rent, equipment, depreciation and utilities. Research and development costs are expensed as incurred unless
there is an alternative future use in other research and development projects. Payments made prior to the receipt of goods or services to be used in research
and development are deferred and recognized as expense in the period in which the related goods are received or services are rendered. Such payments are
evaluated for current or long-term classification based on when they will be realized.

As part of the process of preparing our financial statements, we are required to estimate expenses resulting from our obligations under contracts
with vendors and consultants and clinical site agreements in connection with conducting clinical trials. The financial terms of these contracts are subject to
negotiations  which  vary  from  contract  to  contract  and  may  result  in  payment  flows  that  do  not  match  the  periods  over  which  materials  or  services  are
provided under such contracts. Our objective is to reflect the appropriate expenses in our financial statements by matching those expenses with the period
in which services and efforts are expended. We account for these expenses according to the progress of the production of clinical trial materials or based on
progression of the clinical trial, as measured by patient progression and the timing of various aspects of the trial. We determine accrual estimates by taking
into account discussion with applicable personnel and outside service providers as to the progress or state of consummation of goods and services, or the
services  completed.  During  the  course  of  a  clinical  trial,  we  adjust  the  rate  of  expense  recognition  if  actual  results  differ  from  our  estimates.  We  make
estimates  of  accrued  expenses  as  of  each  balance  sheet  date  in  our  financial  statements  based  on  the  facts  and  circumstances  known  at  that  time.  Our
clinical trial accrual is dependent in part upon the timely and accurate reporting of contract research organizations, contract manufacturers and other third-
party  vendors.  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 our reporting changes in estimates in
any particular period. Adjustments to prior period estimates have not been material for the years ended December 31, 2021 and 2020.

92

 
We have and may continue to enter into license agreements to access and utilize certain technology. We evaluate if the license agreement is an
acquisition of an asset or a business. To date none of our license agreements have been considered to be an acquisition of a business. For asset acquisitions,
the  upfront  payments  to  acquire  such  licenses,  as  well  as  any  future  milestone  payments  made  before  product  approval,  are  immediately  recognized  as
research and development expense when due, provided there is no alternative future use of the rights in other research and development projects. These
license agreements may also include contingent consideration in the form of cash and additional issuances of our common stock.

Stock-Based Compensation

We recognize compensation costs related to stock-based awards granted based on the estimated fair value of the awards on the date of grant,
and we recognize forfeitures as they occur. For awards that vest solely based on service conditions or a combination of service and performance conditions,
we estimate the grant date fair value, and the resulting stock-based compensation expense, using the Black-Scholes option-pricing model. The grant date
fair  value  of  the  awards  is  generally  recognized  on  a  straight-line  basis  over  the  requisite  service  period,  which  is  typically  their  vesting  period.  We
recognize forfeitures as they occur.

The  market  traded  price  of  the  shares  of  common  stock  underlying  the  stock-based  awards  is  the  fair  value  of  our  stock  as  reported  on  the

Nasdaq Global Select Market on the grant date.

The Black-Scholes option-pricing model requires the use of highly subjective assumptions to determine the fair value of stock-based awards.

These assumptions include:

•

•

•

•

Expected  term—The  expected  term  represents  the  period  that  the  stock-based  awards  are  expected  to  be  outstanding.  We  use,  due  to
insufficient historical data, the simplified method to determine the expected term, which is based on the average of the time-to-vesting and
the contractual life of the options.

Expected volatility—Due to our limited trading history for our common stock, the expected volatility is estimated based on the average
historical volatilities of common stock of comparable publicly traded entities over a period equal to the expected term of the stock option
grants. The comparable companies are chosen based on their size, stage in the product development cycle or area of specialty. We will
continue to apply this process until a sufficient amount of historical information regarding the volatility of our own stock price becomes
available.

Risk-free interest rate—The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for zero-coupon U.S.
Treasury notes with maturities approximately equal to the expected term of the awards.

Expected  dividend—We  have  never  paid  dividends  on  our  common  stock  and  have  no  plans  to  pay  dividends  on  our  common  stock.
Therefore, we used an expected dividend yield of zero.

We have also granted stock options to certain key employees that vest in conjunction with certain market conditions. The Company uses the
Monte-Carlo option-pricing model to estimate the fair value of stock option awards that contain only market conditions. The Monte-Carlo option pricing
model uses similar input assumptions as the Black-Scholes model; however, it further incorporates into the fair-value determination the possibility that the
market condition may not be satisfied.

As of December 31, 2021, we had $23.1 million of unrecognized compensation expense related to unvested stock options and restricted stock
units, which is expected to be recognized over an estimated weighted-average period of 3.2 years. For stock-based awards subject to ratable vesting, we
recognize compensation cost on a straight-line basis over the service period for the entire award. In future periods, our stock-based compensation expense
is expected to increase as a result of recognizing our existing unrecognized stock-based compensation for awards that will vest and as we issue additional
stock-based awards to attract and retain our employees.

93

 
 
 
 
 
JOBS Act Accounting Election

We are an emerging growth company, as defined in the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new
or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. We
have irrevocably elected to avail ourselves of this exemption from new or revised accounting standards and, therefore, will not be subject to the same new
or  revised  accounting  standards  as  other  public  companies  that  are  not  emerging  growth  companies.  We  also  rely  on  other  exemptions  provided  by  the
JOBS Act, including, without limitation, providing an auditor’s attestation report on our system of internal controls over financial reporting pursuant to
Section 404(b) of the Sarbanes-Oxley Act. We will remain an emerging growth company until the earlier of (1) the last day of the year following the fifth
anniversary of the consummation of our IPO, (2) the last day of the year in which we have total annual gross revenue of at least $1.07 billion, (3) the last
day of the year in which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2 under the Exchange Act, which would occur if the market
value of our common stock held by non-affiliates exceeded $700.0 million as of the last business day of the second fiscal quarter of such year or (4) the
date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period. Even after we no longer qualify
as  an  emerging  growth  company,  we  may  still  qualify  as  a  “smaller  reporting  company”  which  may  allow  us  to  take  advantage  of  many  of  the  same
exemptions  from  disclosure  requirements  including  not  being  required  to  comply  with  the  auditor  attestation  requirements  of  Section  404(b)  of  the
Sarbanes-Oxley Act.

Recent Accounting Pronouncements

See Note 2 to our Financial Statements “Summary of Significant Accounting Policies” for information.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Cash, Cash Equivalents and Marketable Securities

We are exposed to market risks in the ordinary course of our business. These risks primarily relate to interest rate sensitivities. We had cash,
cash equivalents, and marketable securities of $90.1 million as of December 31, 2021, which consist of bank deposits, money market funds, and marketable
securities.  The  primary  objective  of  our  investment  activities  is  to  preserve  capital  to  fund  our  operations.  We  also  seek  to  maximize  income  from  our
investments without assuming significant risk. Because our investments are primarily short-term in duration, we believe that our exposure to interest rate
risk is not significant, and a 1% movement in market interest rates would not have a significant impact on the total value of our portfolio.

Interest Rate Risk

As  of  December  31,  2021,  the  outstanding  principal  amount  of  the  term  loan  under  the  Hercules  Loan  Agreement  was  $22.7  million.  The
interest  payments  under  our  term  loan  may  be  subject  to  interest  rate  risk  and  our  interest  expense  could  increase  if  market  interest  rates  increase.  The
interest  on  the  term  loan  accrues  at  a  per  annum  rate  of  the  greater  of  (i)  the  Wall  Street  Journal  prime  rate  plus  6.10%  and  (ii)  9.35%.  Accordingly,
increases in these published rates would increase our interest payments under the term loans. The effective interest rate at December 31, 2021 was 16.69%.
A hypothetical 1% change in interest rates would increase expense by approximately $0.4 million annually and would not have a material impact on our
results of operations.

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Item 8. Financial Statements and Supplementary Data.

UNITY BIOTECHNOLOGY, INC.
Index to Financial Statements

Report of Independent Registered Public Accounting Firm (PCAOB ID 42)

Balance Sheets

Statements of Operations and Comprehensive Loss

Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit)

Statements of Cash Flows

Notes to the Financial Statements

95

Page

96

97

98

99

100

101

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of
Unity Biotechnology, Inc.

Opinion on the Financial Statements
We have audited the accompanying balance sheets of Unity Biotechnology, Inc. (“the Company”) as of December 31, 2021 and 2020, and related
statements of operations and comprehensive loss, and stockholders’ equity and cash flows for each of the three years in the period ended December 31,
2021, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material
respects, the financial position of the Company at December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the three
years in the period ended December 31, 2021, in conformity with U.S. generally accepted accounting principles.

The Company's Ability to Continue as a Going Concern
The accompanying financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 1 to the
financial statements, the Company has suffered recurring losses from operations, and has stated that substantial doubt exists about the Company’s ability to
continue as a going concern. Management's evaluation of the events and conditions and management’s plans regarding these matters are also described in
Note 1. The financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Basis for Opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s 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 in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the 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 financial statements, whether due to error or fraud, and
performing procedures that respond to those risks. Such procedures include examining, on a test basis, evidence regarding the amounts and disclosures in
the 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 financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2017.

Redwood City, California
March 15, 2022

96

 
 
 
 
UNITY BIOTECHNOLOGY, INC.
Balance Sheets
(in thousands, except for share amounts and par value)

Assets
Current assets:

Cash and cash equivalents
Short-term marketable securities
Prepaid expenses and other current assets
Restricted cash
Total current assets

Property and equipment, net
Operating lease right-of-use assets
Long-term marketable securities
Long-term restricted cash
Other long-term assets

Total assets

Liabilities and Stockholders’ Equity
Current liabilities:

Accounts payable
Accrued compensation
Accrued and other current liabilities
Deferred revenue
Derivative liability related to debt
Current portion of long-term debt

Total current liabilities
Operating lease liability, net of current portion
Long-term debt, net
Other long-term liabilities
Total liabilities
Commitments and contingencies (Note 7)
Stockholders’ equity:

Convertible preferred stock, $0.0001 par value; 10,000,000 shares
   authorized; no shares issued and outstanding
Common stock, $0.0001 par value; 300,000,000 shares
   authorized as of December 31, 2021 and 2020; 62,991,906
   and 53,253,213 shares issued and outstanding as of
   December 31, 2021 and 2020, respectively
Additional paid-in capital
Related party promissory notes for purchase of common stock
Accumulated other comprehensive gain
Accumulated deficit
Total stockholders’ equity
Total liabilities and stockholders’ equity

December 31,

2021

2020

32,905    $
55,170   
1,879   
550   
90,504   
9,942   
21,286   
1,993   
896   
91   
124,712    $

1,985    $
4,028   
6,370   
216   
963   
3,055   
16,617   
30,094   
18,409   
23   
65,143   

17,807 
79,892 
3,167 
— 
100,866 
12,627 
23,509 
17,871 
1,446 
— 
156,319 

2,558 
5,355 
6,550 
— 
— 
— 
14,463 
34,468 
24,508 
— 
73,439 

—   

— 

6   
459,631   
—   
(44)  
(400,024)  
59,569   
124,712    $

5 
422,379 
(210)
5 
(339,299)
82,880 
156,319

  $

  $

  $

  $

See accompanying notes to the financial statements.

97

 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
UNITY BIOTECHNOLOGY, INC.
Statements of Operations and Comprehensive Loss
(in thousands, except share and per share amounts)

Licensing revenue – Related Party
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Interest income
Interest expense
Other (expense) income, net
Net loss

Other comprehensive loss

Unrealized (loss) gain on marketable debt securities

Comprehensive loss

Net loss per share, basic and diluted

Weighted average number of shares used in computing net loss
   per share, basic and diluted

2021

Year ended December 31,
2020

2019

  $

4,784    $

—    $

— 

38,393   
23,056   
—   
—   
61,449   
(56,665)  
100   
(3,177)  
(983)  
(60,725)   $

(49)  

(60,774)   $

(1.09)   $

67,309   
24,025   
(33)  
2,629   
93,930   
(93,930)  
1,196   
(1,292)  
182   
(93,844)   $

(85)  

(93,929)   $

(1.84)   $

70,957 
20,046 
(1,352)
— 
89,651 
(89,651)
3,289 
— 
4,185 
(82,177)

185 

(81,992)

(1.88)

55,815,873   

50,864,889   

43,624,807

  $

  $

  $

See accompanying notes to the financial statements.

98

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31, 2018

Issuance of common stock, net of issuance costs, under
   at-the-market equity ("ATM") equity offering program
Issuance of common stock upon exercise of stock options
Vesting of early exercised stock options
Stock-based compensation
Common stock issued to third parties
Repurchased shares
Issuance of common stock under employee stock purchase
   plan (“2018 ESPP”)
Unrealized gain on available-for-sale marketable securities
Net loss

Balances at December 31, 2019

Issuance of common stock, net of issuance costs, under
   ATM equity offering program
Issuance of common stock upon exercise of stock options
Issuance of common stock upon vesting of restricted
   stock units
Vesting of early exercised stock options
Stock-based compensation
Common stock issued for services
Common stock issued to third parties for milestone payments
Repayment of promissory note from employee from
   purchase of common stock
Repayment of promissory note from employee through
   repurchase of early exercise shares
Issuance of common stock under 2018 ESPP
Unrealized loss on available-for-sale marketable securities
Net loss

Balances at December 31, 2020

Issuance of common stock, net of issuance costs, under
   ATM equity offering program
Issuance of common stock to Lincoln Park Capital Fund,
   net of issuance costs
Issuance of common stock Hercules Capital,
   net of issuance costs
Issuance of common stock upon exercise of stock options
Issuance of common stock under 2018 ESPP
Common stock granted to third party
Repurchase of early exercised shares
Vesting of restricted stock units
Stock-based compensation
Repayment of promissory note for purchase of common
   stock
Unrealized loss on available-for-sale marketable securities
Net loss

Balances at December 31, 2021

UNITY BIOTECHNOLOGY, INC.
Statements of Stockholders’ Equity
(in thousands, except share amounts)

Common Stock

Shares
42,414,294  

  $

Amount

Additional
Paid-In
Capital

4  

  $

324,663  

Related Party
Promissory Notes
for Purchase of  
  Common Stock  
  $

Employee
Promissory
Notes for
Purchase of
  Common Stock 

Accumulated
Other
Comprehensive 

  Gain (Loss)

  Accumulated  
Deficit

Total
Stockholders’  
Equity

(201 )   $

(400 )   $

(95 )   $

(163,278 )   $

160,693  

—  
—  
—  
—  
—  
—  

—  
185  
—  
90  

—  
—  

—  
—  
—  
—  
—  

—  

  $

26,085  
840  
647  
10,852  
3,022  
—  

586  
—  
—  
366,695  

37,270  
1,510  

—  
216  
13,746  
100  
2,310  

—  

(44 )  
576  
—  
—  
422,379  

  $

  $

10,357  

9,039  

2,704  
1,795  
347  
1,457  
—  
—  
11,553  

3,974,908  
505,226  
—  
—  
253,334  

(4,281 )  

83,584  
—  
—  
47,227,065  

5,002,257  
410,484  

  $

103,020  
—  
—  
43,550  
361,644  

—  

(12,909 )  
118,102  
—  
—  
53,253,213  

  $

1,894,527  

4,172,855  

1,727,361  
497,538  
117,037  
400,052  
(33,370 )  
962,693  
—  

—  
—  
—  
62,991,906  

  $

1  
—  
—  
—  
—  
—  

—  
—  
—  
5  

—  
—  

—  
—  
—  
—  
—  

—  

—  
—  
—  
—  
5  

—  

1  

—  
—  
—  
—  
—  
—  

—  
—  
—  
6  

—  
—  
—  
—  
(9 )  
—  

—  
—  
—  

—  
—  
—  
—  
(18 )  
—  

—  
—  
—  

  $

(210 )   $

(418 )   $

—  
—  
—  
—  
—  
—  

—  
—  

(82,177 )  
(245,455 )   $

  $

—  
—  

—  
—  
—  
—  
—  

—  

—  
—  
—  
—  

(210 )   $

—  

—  

—  
—  
—  
—  
—  
—  
—  

—  
—  

—  
—  
—  
—  
—  

374  

44  
—  
—  
—  
—  

—  

—  

—  
—  
—  
—  
—  
—  
—  

—  
—  
—  
—  

—  
—  
(85 )  
—  
5  

  $

  $

—  

—  

—  
—  
—  
—  
—  
—  
—  

—  
(49 )  
—  
(44 )   $

  $

—  
—  

—  
—  
—  
—  
—  

—  

—  
—  
—  

(93,844 )  
(339,299 )   $

—  

—  

—  
—  
—  
—  
—  
—  
—  

—  
—  

(60,725 )  
(400,024 )   $

—  
—  
—  
459,631  

  $

  $

210  
—  
—  
—  

  $

See accompanying notes to the financial statements

99

26,086  
840  
647  
10,852  
2,995  
—  

586  
185  
(82,177 )
120,707  

37,270  
1,510  

—  
216  
13,746  
100  
2,310  

374  

—  
576  
(85 )
(93,844 )
82,880  

10,357  

9,040  

2,704  
1,795  
347  
1,457  
—  
—  
11,553  

210  
(49 )
(60,725 )
59,569  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
UNITY BIOTECHNOLOGY, INC.
Statements of Cash Flows
(in thousands)

Operating activities
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and amortization
Amortization of debt issuance costs
Debt extinguishment gain upon conversion to equity
Net accretion and amortization of premium and discounts on marketable securities
Other expense related to the commitment shares issued to Lincoln Park
   Capital Fund
Stock-based compensation
Common stock issued to third parties
Non-cash rent expense
Impairment of long-lived assets
Change in fair value of strategic investment
Accretion of tenant improvement allowance
Change in fair value of contingent consideration
Changes in operating assets and liabilities:

Prepaid expenses and other current assets
Other long-term assets
Accounts payable
Accrued compensation
Accrued liabilities and other current liabilities
Other long-term liabilities
Derivative liability related to debt
Deferred revenue
Deferred rent, net of current portion

Net cash used in operating activities
Investing activities
Purchase of marketable securities
Maturities of marketable securities
Sale of strategic investments
Purchase of property and equipment
Net cash provided by (used in) investing activities
Financing activities
Proceeds from issuance of common stock under ATM offering program,
   net of issuance costs
Proceeds from issuance of common stock to Lincoln Park Capital Fund,
   net of issuance costs
Proceeds from repayment of employee promissory notes
Proceeds from long-term debt, net of issuance costs to lender
Payment of long-term debt non-lender issuance costs
Proceeds from issuance of common stock upon exercise of stock options,
   net of repurchases
Proceeds from issuance of common stock under the 2018 ESPP
Current portion of long-term debt arrangement
Payments made on capital lease obligations
Net cash provided by financing activities
Net increase (decrease) in cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at beginning of year
Cash, cash equivalents and restricted cash at end of year
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest
Supplemental Disclosures of Non-Cash Investing and Financing Activities
Issuance of common shares in payment of debt
Property and equipment included in accounts payable
Issuance of common stock in settlement of contingent consideration milestone
Issuance of shares in settlement of share-based liability
Right-of-use assets obtained in exchange for new operating lease liabilities
Lessor funded lease incentives included in property and equipment
Receipt of promissory note from related party for purchase of common stock

2021

Year Ended December 31,
2020

2019

  $

(60,725)   $

(93,844)   $

(82,177)

2,880 
813 
(123)  
1,043 

825 
11,553 
1,457 
(2,152)  
— 
— 
— 
— 

1,288 

(91)  
(573)  
(1,327)  
(1,131)  
24 
963 
216 
— 

(45,060)  

(81,492)  
121,000 
— 
(195)  

39,313 

10,357 

8,215 
210 
— 
— 

1,784 
347 
(68)  
— 
20,845 
15,098 
19,253 
34,351 

  $

3,449 
318 
— 
256 

— 
13,813 
1,211 
(1,076)  
2,629 
(502)  
— 
(33)  

(1,168)  
628 
(2,640)  
(517)  
(857)  
— 
— 
— 
— 

(78,333)  

(138,486)  
127,915 
6,009 
(646)  
(5,208)  

37,270 

— 
374 
24,550 

(360)  

1,510 
576 
— 
(45)  

63,875 
(19,666)  
38,919 
19,253 

  $

2,370 

  $

773 

  $

2,704 
— 
— 
— 
— 
— 
— 

  $
  $
  $
  $
  $
  $
  $

— 
13 
1,098 
100 
27,714 
— 
— 

  $
  $
  $
  $
  $
  $
  $

2,663 
— 
— 
(1,151)

— 
10,852 
965 
— 
— 
(4,507)
(1,275)
(1,352)

(169)
(31)
(227)
2,114 
(587)
— 
— 
— 
2,461 
(72,421)

(119,270)
188,809 
— 
(1,586)
67,953 

26,085 

— 
— 
— 
— 

840 
586 
— 
(73)
27,438 
22,970 
15,949 
38,919 

— 

— 
565 
— 
— 
— 
10,651 
27  

  $

  $

  $
  $
  $
  $
  $
  $
  $

See accompanying notes to the financial statements.

100

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
UNITY BIOTECHNOLOGY, INC.
NOTES TO THE FINANCIAL STATEMENTS

1. Organization

Description of Business

Unity Biotechnology, Inc. (the “Company”) is a biotechnology company engaged in the research and development of therapeutics to slow, halt, or reverse
diseases of aging. The Company devotes substantially all of its time and efforts to performing research and development, raising capital, and recruiting
personnel. The Company’s headquarters are located in South San Francisco, California. The Company was incorporated in the State of Delaware in 2009.

Liquidity

In accordance with Accounting Standards Update (“ASU”) No. 2014-15, Disclosures  of  Uncertainties  about  an  Entity’s  Ability  to  Continue  as  a  Going
Concern (Subtopic 205-40) (“ASU  No.  2014-15”),  management  must  evaluate  whether  there  are  conditions  or  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 financial statements are issued.
This evaluation initially does not take into consideration the potential mitigating effect of management’s plans that have not been fully implemented as of
the date the financial statements are issued. When substantial doubt exists under this methodology, management evaluates whether the mitigating effect of
its plans sufficiently alleviates substantial doubt about the Company’s ability to continue as a going concern. The mitigating effect of management’s plans,
however,  is  only  considered  if  both  (1)  it  is  probable  that  the  plans  will  be  effectively  implemented  within  one  year  after  the  date  that  the  financial
statements are issued and (2) it is probable that the plans, when implemented, will mitigate the relevant conditions or events that raise substantial doubt
about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued. Generally, to be considered
probable of being effectively implemented, the plans must have been approved before the date that the financial statements are issued.

The Company’s Financial Statements have been prepared on a going concern basis, which contemplates the continuity of operations, realization of assets
and the satisfaction of liabilities and commitments in the ordinary course of business. The Company has incurred operating losses and has an accumulated
deficit  as  a  result  of  ongoing  efforts  to  develop  drug  product  candidates,  including  conducting  preclinical  and  clinical  trials  and  providing  general  and
administrative support for these operations. The Company had an accumulated deficit of $400.0 million as of December 31, 2021. During the year ended
December  31,  2021,  the  Company  incurred  a  net  loss  of  $60.7  million  and  used  $45.1  million  of  cash  in  operating  activities.  To  date,  none  of  the
Company’s drug candidates have been approved for sale, and therefore, the Company has not generated any revenue from contracts with customers and
does  not  expect  positive  cash  flows  from  operations  in  the  foreseeable  future.  The  Company  has  financed  its  operations  primarily  through  private
placements of preferred stock and promissory notes, public equity issuances and more recently, from its ATM Offering Program (as defined in Note 10), the
Term Loan Facility (as defined in Note 8) and an Equity Purchase Agreement (as defined in Note 10), and will continue to be dependent upon equity and/or
debt financing until the Company is able to generate positive cash flows from its operations.

The Company had cash, cash equivalents and marketable securities of $90.1 million as of December 31, 2021. As of March 15, 2022, the date of issuance
of these Financial Statements, the Company expects that its cash and cash equivalents as of December 31, 2021 will not be sufficient to fund its current
business  plan  including  related  operating  expenses  and  capital  expenditure  requirements  through  at  least  12  months  from  the  date  of  issuance  of  these
Financial Statements. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. The Company plans to seek to
address  this  condition  by  raising  additional  capital  to  finance  its  operations.  The  future  viability  of  the  Company  is  dependent  on  its  ability  to  raise
additional capital to finance its operations. Although the Company has been successful in raising capital in the past, there is no assurance that it will be
successful in obtaining such additional financing. Therefore, it is not considered probable, as defined in ASU No. 2014-15, that the Company’s plans to
raise additional capital will alleviate the substantial doubt regarding its ability to continue as a going concern.

Management expects operating losses to continue for the foreseeable future. As a result, the Company will need to raise additional capital. If sufficient
funds on acceptable terms are not available when needed, the Company could be required to significantly reduce its operating expenses and delay, reduce
the scope of, or eliminate one or more of its development programs. Failure to manage discretionary spending or raise additional financing, as needed, may
adversely impact the Company’s ability to achieve its intended business objectives.

101

 
 
 
 
 
2. Summary of Significant Accounting Policies

Basis of Presentation

These financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and
the rules and regulations of Securities and Exchange Commission (“SEC”) for reporting.

Use of Estimates

The  preparation  of  financial  statements  in  conformity  with  GAAP  requires  management  to  make  estimates  and  assumptions  that  affect  the  amounts
reported  in  the  financial  statements  and  accompanying  notes.  The  Company  bases  its  estimates  on  historical  experience  and  market-specific  or  other
relevant assumptions that it believes are reasonable under the circumstances. The amounts of assets and liabilities reported in the Company’s balance sheets
and the amount of expenses and income reported for each of the periods presented are affected by estimates and assumptions, which are used for, but are
not limited to, determining the fair value of assets and liabilities, contingent consideration liability, the fair value of right-of-use assets and lease liabilities,
embedded derivatives and stock-based compensation. Actual results could differ from such estimates or assumptions.

Segments

The Company has one operating segment. The Company’s chief operating decision maker, its Chief Executive Officer, manages the Company’s operations
on a consolidated basis for the purposes of allocating resources.

Cash, Cash Equivalents, and Restricted Cash

The Company considers all highly liquid investments with original maturities of 90 days or less from the date of purchase to be cash equivalents. Cash
equivalents primarily include money market funds that invest in U.S. Treasury obligations which are stated at fair value.

The Company has issued letters of credit under its lease agreements which have been collateralized. This cash is classified as noncurrent restricted cash on
the balance sheet based on the term of the underlying lease.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that sum to the total of the
same amounts shown in the statements of cash flows (in thousands).

Cash and cash equivalents
Restricted cash
Total cash, cash equivalents, and restricted cash

Marketable Securities

  $

  $

2021

32,905 
1,446 
34,351 

 $

 $

December 31,
2020

17,807 
1,446 
19,253 

 $

 $

2019

37,473 
1,446 
38,919

The Company generally invests its excess cash in investment grade, short to intermediate-term, fixed income securities. Such investments are considered
available-for-sale debt securities and reported at fair value with unrealized gains and losses included as a component of stockholders’ equity. Marketable
securities with original maturities of greater than 90 days from the date of purchase but less than one year from the balance sheet date that are available to
be converted into cash to fund current operations are classified as short-term, while marketable securities with maturities in one year or beyond one year
from the balance sheet date are classified as long-term. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of
discounts to maturity, which is included in interest income on the statements of operations and comprehensive loss. Realized gains and losses and declines
in value judged to be other-than-temporary, if any, on marketable securities are included in other expense. The cost of securities sold is determined using
the specific identification method.

The  Company  periodically  evaluates  whether  declines  in  fair  values  of  its  marketable  securities  below  their  book  value  are  other-than-temporary.  This
evaluation consists of several qualitative and quantitative factors regarding the severity and duration of the unrealized loss as well as the Company’s ability
and intent to hold the marketable security until a forecasted recovery occurs. Additionally, the Company assesses whether it has plans to sell the security or
it is more likely than not it will be required to sell any marketable securities before recovery of its

102

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
amortized  cost  basis.  Factors  considered  include  quoted  market  prices,  recent  financial  results  and  operating  trends,  implied  values  from  any  recent
transactions or offers of investee securities, credit quality of debt instrument issuers, other publicly available information that may affect the value of the
marketable security, duration and severity of the decline in value, and management’s strategy and intentions for holding the marketable security. To date,
the Company has not recorded any impairment charges on its marketable securities related to other-than-temporary declines in market value.

Strategic Investments

The Company has previously made investments in strategic partners and may do so again in the future. The Company does not intend to have a controlling
interest or significant influence when it makes these strategic investments. Investments in equity securities of strategic partners with readily determinable
fair  values  are  measured  using  quoted  market  prices,  with  changes  recorded  through  other  income  (expense),  net  in  the  statement  of  operations  and
comprehensive loss.

Fair Value Measurements

The  Company’s  financial  instruments  during  the  periods  presented  consist  of  cash  and  cash  equivalents,  restricted  cash,  marketable  securities,  strategic
investments,  prepaid  expenses  and  other  current  assets,  accounts  payable,  accrued  compensation,  accrued  and  other  current  liabilities,  contingent
consideration liabilities, derivative liabilities related to debt and long-term debt. Fair value estimates of these instruments are made at a specific point in
time, based on relevant market information. Level 3 instruments incorporate certain unobservable inputs such as the selected discount rate of the related
loan. These estimates may be subjective in nature and involve uncertainties and matters of judgment.

Revenue Recognition

The  Company  recognizes  revenue  in  accordance  with  the  provisions  of  Accounting  Standards  Codification  Topic  606,  Revenue  from  Contracts  with
Customers, or Topic 606. In determining the appropriate amount and timing of revenue to be recognized under this guidance, the Company performs the
following five steps: (i) identifies the contract(s) with our customer; (ii) identifies the promised goods or services in the agreement and determine whether
they are performance obligations, including whether they are distinct in the context of the agreement; (iii) measures the transaction price, including the
constraint  on  variable  consideration;  (iv)  allocates  the  transaction  price  to  the  performance  obligations  based  on  stand-alone  selling  prices;  and  (v)
recognizes revenue when (or as) the Company satisfies each performance obligation.

A performance obligation is a promise in an agreement to transfer a distinct good or service to the customer and is the unit of account in Topic 606.
Significant management judgment is required to determine the level of effort required and the period over which completion of the performance obligations
is expected under an agreement. If reasonable estimates regarding when performance obligations are either complete or substantially complete cannot be
made, then revenue recognition is deferred until a reasonable estimate can be made. Revenue is then recognized over the remaining estimated period of
performance using the cumulative catch-up method.

The Company allocates the total transaction price to each performance obligation based on the estimated relative stand-alone selling prices of the promised
goods or services underlying each performance obligation. The total consideration which the Company expects to collect in exchange for the Company’s
products is an estimate and may be fixed or variable. The Company constrains the estimated variable consideration when it assesses it is probable that a
significant reversal in the amount of cumulative revenue recognized may occur in future periods. The transaction price is re-evaluated, including the
estimated variable consideration 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. The allocation of the transaction price is performed based on standalone selling prices, which are based on
estimated amounts that the Company would charge for a performance obligation if it were sold separately. Revenue is recognized when, or as, performance
obligations in the contracts are satisfied, in the amount reflecting the expected consideration to be received from the goods or services transferred to the
customers. Consideration received in advance are recorded as deferred revenue and are recognized as the related performance obligation is satisfied.

Following  is  a  description  of  the  principal  activities  from  which  the  Company  generates  revenue.  License  revenue  primarily  represent  amounts  earned
under  agreements  that  license  our  intellectual  property  to  other  companies.  See  Note  5,  “License  Revenue,  Agreements  and  Strategic  Investment”  for
further detail. Consideration under these

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contracts  generally  includes  a  nonrefundable  upfront  payment,  development,  regulatory  and  commercial  milestones  and  royalties  based  on  net  sales  of
approved products.
Licenses of Intellectual Property. 
If the Company determines the license to intellectual property is distinct from the other performance obligations identified in the agreement and the
licensee can use and benefit from the license, the Company recognizes revenue from the estimated transaction price that is allocated to the license.
Licensing arrangements are analyzed to determine whether the promised goods or services, which may include licenses, transfer of know-how, transfer of
materials, research and development services and governance committee services, are distinct or whether they must be accounted for as part of a combined
performance obligation. If the license is considered not to be distinct, the license would then be combined with other promised goods or services as a
combined performance obligation. If the Company is involved in a governance committee, it assesses whether its involvement constitutes a separate
performance obligation. When governance committee services are determined to be separate performance obligations, the Company determines the fair
value to be allocated to this promised service.
Milestone Payments: At the inception of each agreement that includes milestone payments, the Company evaluates whether the milestones are considered
probable of being achieved and estimate 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 value of the associated milestone is included in the transaction price. For milestones that the Company do
not deem to be probable of being achieved, the associated milestone payments are fully constrained and the value of the milestone is excluded from the
transaction price with no revenue being recognized. For example, milestone payments that are not within our control, such as regulatory-related
accomplishments, are not considered probable of being achieved until those accomplishments have been communicated by the relevant regulatory
authority. Once the assessment of probability of achievement becomes probable, the Company recognizes revenue for the milestone payment. At each
reporting date, the Company assesses the probability of achievement of each milestone under our current agreements

Royalties. For agreements with sales-based royalties, including milestone payments based on the level of sales, where the license is deemed to be the
predominant item to which the royalties relate, the Company recognizes revenue at the later of (a) when the related sales occur, or (b) when the
performance obligation, to which some or all of the royalty has been allocated, has been satisfied (or partially satisfied). At each reporting date, the
Company estimates the sales incurred by each licensee during the reporting period based on historical experience and accrues the associated royalty
amount.

Concentrations of Risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, restricted
cash, and marketable securities. Substantially all of the Company’s cash and cash equivalents and restricted cash is deposited in accounts with financial
institutions that management believes are of high credit quality. Such deposits have and will continue to exceed federally insured limits. The Company
maintains its cash with accredited financial institutions and accordingly, such funds are subject to minimal credit risk. The Company has not experienced
any losses on its cash deposits.

The Company’s investment policy limits investments in marketable securities to certain types of securities issued by the U.S. government, its agencies and
institutions  with  investment-grade  credit  ratings  and  places  restrictions  on  maturities  and  concentration  by  type  and  issuer.  The  Company  is  exposed  to
credit risk in the event of a default by the financial institutions holding its cash, cash equivalents, restricted cash and marketable securities and issuers of
marketable  securities  to  the  extent  recorded  on  the  balance  sheets.  As  of  December  31,  2021  and  2020,  the  Company  had  no  off-balance  sheet
concentrations of credit risk.

The Company depends on third-party suppliers for key raw materials used in its manufacturing processes and is subject to certain risks related to the loss of
these third-party suppliers or their inability to supply the Company with adequate raw materials.

In March 2020, the World Health Organization declared the COVID-19 outbreak a pandemic. To date, the Company’s operations have not been materially
impacted by the COVID-19 pandemic. However, the Company cannot at this time predict the specific extent, duration, or full impact that the COVID-19
pandemic  will  have  on  its  financial  condition  and  results  of  operations,  including  ongoing  and  planned  clinical  studies.  The  impact  of  the  COVID-19
pandemic  on  the  financial  performance  of  the  Company  will  depend  on  future  developments.  These  developments  and  the  impact  of  the  COVID-19
pandemic on the financial markets and the overall economy are highly uncertain. The Company continues to monitor the impact the COVID-19 pandemic
may have on the clinical

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development of its product candidates, including potential delays or modifications to its ongoing and planned studies.

Research and Development Expenses and Accruals

Costs  related  to  research,  design,  and  development  of  drug  candidates  are  charged  to  research  and  development  expense  as  incurred.  Research  and
development  costs  include,  but  are  not  limited  to,  payroll  and  personnel  expenses  for  personnel  contributing  to  research  and  development  activities,
laboratory supplies, outside services, licenses acquired to be used in research and development, manufacturing of clinical material, pre-clinical testing and
consultants and allocated overhead, including rent, equipment, depreciation, and utilities. Research and development costs are expensed as incurred unless
there is an alternative future use in other research and development projects. Payments made prior to the receipt of goods or services to be used in research
and development are deferred and recognized as expense in the period in which the related goods are received or services are rendered. Such payments are
evaluated for current or long-term classification based on when they will be realized.

As part of the process of preparing its financial statements, the Company is required to estimate expenses resulting from its obligations under contracts with
vendors  and  consultants  and  clinical  site  agreements  in  connection  with  conducting  clinical  trials.  The  financial  terms  of  these  contracts  are  subject  to
negotiations  which  vary  from  contract  to  contract  and  may  result  in  payment  flows  that  do  not  match  the  periods  over  which  materials  or  services  are
provided under such contracts. The Company’s objective is to reflect the appropriate expenses in its financial statements by matching those expenses with
the period in which services and efforts are expended. The Company accounts for these expenses according to the progress of the production of clinical
trial materials or based on progression of the clinical trial, as measured by patient progression and the timing of various aspects of the trial. The Company
determines  accrual  estimates  by  taking  into  account  discussion  with  applicable  personnel  and  outside  service  providers  as  to  the  progress  or  state  of
consummation of goods and services, or the services completed.

During the course of a clinical trial, the rate of expense recognition is adjusted if actual results differ from the Company’s estimates. The Company makes
estimates of accrued expenses as of each balance sheet date in its financial statements based on the facts and circumstances known at that time. The clinical
trial accrual is dependent in part upon the timely and accurate reporting of contract research organizations, contract manufacturers, and other third-party
vendors. Although the Company does not expect its estimates to be materially different from amounts actually incurred, its 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 changes in estimates in any
particular period. Adjustments to prior period estimates have not been material for the years ended December 31, 2021 and 2020.

Contingent Consideration Liability

The  Company  has  entered  into  and  may  continue  to  enter  into,  license  agreements  to  access  and  utilize  certain  technology.  In  each  case,  the  Company
evaluates whether the license agreement results in the acquisition of an asset or a business. To date, all of the Company’s license agreements have been
considered acquisitions of assets and none have been considered acquisitions of a business. For license agreements that are considered to be acquisitions of
assets,  the  upfront  payments  for  such  license,  as  well  as  any  future  milestone  payments  made  before  product  approval,  are  immediately  recognized  as
research and development expense when due, provided there is no alternative future use of the rights in other research and development projects. Some of
the Company’s license agreements also include contingent consideration in the form of an obligation to issue additional shares of the Company’s common
stock based on the achievement of certain milestones. The Company assesses on a continuous basis whether (i) such contingent consideration meets the
definition of a derivative, and (ii) whether it can be classified within stockholders’ equity. Until such time when equity classification criteria are met or the
milestones expire, the contingent consideration is classified as a liability. The derivative related to this contingent consideration is measured at fair value as
of  each  balance  sheet  date  with  the  related  change  in  fair  value  being  reflected  in  operating  expenses.  Upon  a  reassessment  event  that  results  in  the
contingent consideration no longer meeting the definition of a derivative and/or meeting equity classification criteria, the final change in fair value of the
instrument is recorded within operating expenses and the liability is reclassified into stockholders’ equity.

Property and Equipment, Net

Property and equipment are stated at cost, less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful
lives of the respective assets, generally three years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful
lives or the term of the lease. Depreciation and amortization begin at the time the asset is placed in service. Maintenance and repairs are charged to expense
as incurred and costs of improvement are capitalized.

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Leases

Prior to January 1, 2020, the Company accounted for its leases of office space and laboratory facilities under non-cancelable operating lease agreements
and recognized related rent expense on a straight-line basis over the term of the lease. Incentives granted under the Company’s facilities lease, including
allowances to fund leasehold improvements and rent holidays, were recognized as reductions to rental expense on a straight-line basis over the term of the
lease. Lessor funded leasehold improvement incentives not yet received were recorded in prepaid expenses and other current assets on the balance sheets.
The Company did not assume renewals in its determination of the lease term unless they were deemed to be reasonably assured at the inception of the lease
and began recognizing rent expense on the date that it obtained the legal right to use and control the leased space. Deferred rent consisted of the difference
between cash payments and the rent expense recognized. The Company recognized a liability for costs that would continue to be incurred under a lease
contract for its remaining term without economic benefit at its fair value when the entity ceased using the right conveyed by the contract, which was when
the space was completely vacated.

Subsequent  to  January  1,  2020,  the  Company  determines  whether  the  arrangement  is  or  contains  a  lease  at  the  inception  of  the  arrangement  and  if  so,
whether such a lease is classified as a financing lease or an operating lease. Operating leases are included in operating lease right-of-use assets, (“ROU
assets”), operating lease liabilities, net of current portion, and accrued and other current liabilities on the Company’s balance sheets. The Company has
elected not to recognize on the balance sheets leases with terms of one year or less. Operating lease ROU assets represent the Company’s right to use an
underlying asset for the lease term and are considered long-lived assets for purposes of identifying, recognizing and measuring impairment. Operating lease
liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and operating lease liabilities are
recognized  based  on  the  present  value  of  lease  payments  over  the  expected  lease  term.  As  the  Company’s  leases  do  not  provide  an  implicit  rate,  the
Company uses its incremental borrowing rate, which is the rate incurred to borrow on a collateralized basis over a similar term an amount equal to the lease
payments in a similar economic environment, in determining the present value of lease payments. The operating lease ROU asset also includes any lease
payments made or incentives received and impairment charges if the Company determines the ROU asset is impaired and excludes lease incentives. The
Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options to
extend or terminate the lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

The Company has elected to not separate lease and non-lease components for its leased assets and accounts for all lease and non-lease components of its
agreements as a single lease component.  The lease components resulting in a ROU asset have been recorded on the balance sheets and are amortized as
lease expense on a straight-line basis over the lease term.

The Company has subleased all of its Brisbane, California facility and a portion of its South San Francisco, California facility under agreements considered
to  be  operating  leases  according  to  ASC  842.  The  Company  has  not  been  legally  released  from  its  primary  obligations  under  the  original  leases  and
therefore  it  continues  to  account  for  the  original  leases  as  it  did  before  commencement  of  the  subleases.  The  Company  records  both  fixed  and  variable
payments received from the sublessee in its statements of operations on a straight-line basis as an offset to rent expense.

The Company does not have any material financing leases.

Impairment of Long-Lived Assets

The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not
be  fully  recoverable.  If  indicators  of  impairment  exist  and  the  undiscounted  future  cash  flows  that  the  assets  are  expected  to  generate  are  less  than  the
carrying value of the assets, the Company reduces the carrying amount of the assets through an impairment charge, to their estimated fair value based on a
discounted cash flow approach or, when available and appropriate, to comparable market values. During the year ended December 31, 2020, the Company
evaluated indicators of impairment for the ROU asset and related leasehold improvements considering the current economic environment and COVID-19
outbreak, its impact on subleasing activity and the exit of its previous headquarters located in Brisbane, California. The Company concluded the carrying
value of these assets were not fully recoverable and recorded an impairment charge of $2.6 million. See Note 7, “Commitments and Contingencies”.

Determining estimated discounted cash flows for purposes of an impairment analysis requires the Company to make estimates and assumptions regarding
the  amount  and  timing  of  sublease  income.  There  are  often  risks  and  uncertainties  associated  with  the  intent  to  sublease  offices  and  laboratory  space.
Consequently, the eventual realized sublease revenues may vary from estimates as of the impairment testing date and adjustments may occur in future

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periods. Furthermore, the Company’s sublease assumptions could be further impacted by the uncertainties caused by the COVID-19 outbreak.

Stock-Based Compensation

The  Company  measures  compensation  expense  for  all  stock-based  awards  based  on  their  grant  date  fair  value.  For  stock-based  awards  with  service
conditions  only,  stock-based  compensation  expense  is  recognized  over  the  requisite  service  period  using  the  straight-line  method.  For  awards  with
performance  conditions,  the  Company  evaluates  the  probability  of  achieving  performance  condition  at  each  reporting  date.  The  Company  begins  to
recognize stock-based compensation expense using an accelerated attribution method when it is deemed probable that the performance condition will be
met. Forfeitures are recognized as they occur.

The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock option awards that do not contain market conditions. The
Black-Scholes option-pricing model requires assumptions to be made related to the expected term of an award, expected dividends, expected volatility and
risk-free rate.

The Company has used the Monte-Carlo option-pricing model to estimate the fair value of stock option awards that contain only market conditions. The
Monte-Carlo  option  pricing  model  uses  similar  input  assumptions  as  the  Black-Scholes  model;  however,  it  further  incorporates  into  the  fair-value
determination the possibility that the market condition may not be satisfied.

Embedded Derivatives of the Loan Agreement

The Company measures derivative liability related to debt at fair value. Estimated fair value of the derivative liability related to debt, initially measured and
recorded on the date of the amendment of the loan and security agreement, is considered to be a Level 3 instrument. The fair value of the derivative liability
related  to  debt  is  based  on  the  term  loan  principal,  the  date  of  maturity,  the  contractual  term  loan  interest  rate,  the  convertible  discount  factor,  and  the
selected  discount  rate  of  the  loan.  The  derivative  liability  related  to  debt  is  recorded  at  fair  value  at  the  end  of  each  reporting  period  with  changes  in
estimated fair values recognized as a component of other income (expense), net in the statements of operations and comprehensive loss.

Restructuring

The Company recognizes restructuring charges related to reorganization plans that have been committed to by management and when liabilities have been
incurred. In connection with these activities, the Company records restructuring charges at fair value for a) contractual employee termination benefits when
obligations  are  associated  to  services  already  rendered,  rights  to  such  benefits  have  vested,  and  payment  of  benefits  is  probable  and  can  be  reasonably
estimated, and b) one-time employee termination benefits when management has committed to a plan of termination, the plan identifies the employees and
their  expected  termination  dates,  the  details  of  termination  benefits  are  complete,  it  is  unlikely  changes  to  the  plan  will  be  made  or  the  plan  will  be
withdrawn and communication to such employees has occurred.

One-time employee termination benefits are recognized in their entirety when communication has occurred, and future services are not required. Contract
termination costs to be incurred over the remaining contract term without economic benefit are recorded in their entirety when the contract is canceled.

The recognition of restructuring charges requires the Company to make certain judgments and estimates regarding the nature, timing and amount of costs
associated with the planned reorganization plan. At the end of each reporting period, the Company evaluates the remaining accrued restructuring balances
to ensure that no excess accruals are retained, and the utilization of the provisions are for their intended purpose in accordance with developed restructuring
plans.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes, in which deferred tax assets and liabilities are recognized for future tax
consequences  attributable  to  the  differences  between  the  financial  statement  carrying  amounts  of  existing  assets  and  liabilities  and  their  respective  tax
bases. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary
differences are expected to be reversed. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as income in the period that
includes  the  enactment  date.  A  valuation  allowance  is  established  if  it  is  more  likely  than  not  that  all  or  a  portion  of  the  deferred  tax  asset  will  not  be
realized.

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The Company’s tax positions are subject to income tax audits. The Company recognizes the tax benefit of an uncertain tax position only if it is more likely
than not that the position is sustainable upon examination by the taxing authority, based on the technical merits. The tax benefit recognized is measured as
the  largest  amount  of  benefit  which  is  more  likely  than  not  to  be  realized  upon  settlement  with  the  taxing  authority.  The  Company  recognizes  interest
accrued  and  penalties  related  to  unrecognized  tax  benefits  in  its  tax  provision.  The  Company  evaluates  uncertain  tax  positions  on  a  regular  basis.  The
evaluations are based on a number of factors, including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during
the  course  of  the  audit,  and  effective  settlement  of  audit  issues.  The  provision  for  income  taxes  includes  the  effects  of  any  accruals  that  the  Company
believes are appropriate, as well as the related net interest and penalties.

On  March  18,  2020,  the  Families  First  Coronavirus  Response  Act  (“FFCR  Act”),  and  on  March  27,  2020,  the  Coronavirus  Aid,  Relief,  and  Economic
Security Act (“CARES Act”) were each enacted in response to the COVID-19 pandemic. The FFCR Act and the CARES Act contain numerous tax-related
provisions relating to refundable payroll tax credits, deferment of employer side social security payments, net operating loss carryback periods, alternative
minimum  tax  credit  refunds,  modifications  to  the  net  interest  deduction  limitations  and  technical  corrections  to  tax  depreciation  methods  for  qualified
improvement property.

On  June  29,  2020  California  State  Assembly  Bill  85  (the  “Trailer  Bill”)  was  enacted  which  suspends  the  use  of  California  net  operating  loss  (“NOL”)
deductions and certain tax credits, including research and development tax credits, for the 2020, 2021, and 2022 tax years.

In December 2020, the Consolidated Appropriations Act, 2021 (the “CAA” ) was signed into law. The CAA included additional funding through tax credits
as part of its economic package for 2021.

The  FFCR  Act,  CARES  Act,  Trailer  Bill  and  CAA  did  not  have  a  material  impact  on  the  Company’s  financial  statements  as  of  December  31,  2020;
however,  the  Company  continues  to  examine  the  impacts  the  FFCR  Act,  CARES  Act  and  Trailer  Bill  may  have  on  its  business,  results  of  operations,
financial condition and liquidity.

On March 10, 2021, Congress passed the American Rescue Plan Act (“ARP Act”) of 2021.  On March 11, 2021, President Biden signed the bill into law.
The ARP contains employment-related provisions. The ARP is a follow-up to the CARES Act, and that part of the CAA Act of 2021 devoted to COVID-19
relief.  The ARP includes Paycheck Protection Program (PPP) funding changes and expanded the Employee Retention Credit (ERC) provisions under the
CAA. The Company did not apply for a PPP loan. Regarding the ERC, management has calculated that a total ERC of $535,504 for 2020 and $957,839 for
2021 are available. The Company does not expect the ARP to have a material impact on the Company’s financial statements. Any change to the deferred
taxes as a result of the enactment of the ARP is expected to be fully offset to the valuation allowance.

Net Loss per Common Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of shares outstanding for the period. Diluted net loss per share is
calculated by dividing net loss by the weighted average number of shares of common stock and potential dilutive common stock equivalents outstanding
during the period if the effect is dilutive. Since the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted
net loss per share as the effects of potentially dilutive securities are antidilutive. The calculation of diluted loss per share also requires that, to the extent the
presumed issuance of additional shares as contingent consideration is dilutive to loss per share for the period, adjustments to net loss used in the calculation
are  required  to  remove  the  change  in  fair  value  of  the  contingent  consideration  liability  for  the  period.  Likewise,  adjustments  to  the  denominator  are
required to reflect the related dilutive shares. In all periods presented, the Company’s outstanding stock options, convertible preferred stock, early exercised
common  stock  subject  to  future  vesting,  restricted  stock  accounted  for  as  options  common  and  preferred  stock  warrants  and  presumed  issuance  of
additional shares as contingent consideration were excluded from the calculation of diluted net loss per share because their effects were antidilutive.

Comprehensive Loss

Comprehensive  loss  includes  net  loss  and  certain  changes  in  stockholders’  equity  that  are  excluded  from  net  loss,  primarily  unrealized  losses  on  the
Company’s marketable securities.

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Recently Issued Accounting Pronouncements Not Yet Adopted

In October 2020, the FASB issued ASU 2020-10, Codification Improvements. The  ASU  contains  improvements  to  the  Codification  by  ensuring  that  all
guidance that requires or provides an option for an entity to provide information in the notes to financial statements is codified in the disclosure section of
the Codification. The ASU also improves various topics in the Codification so that entities can apply guidance more consistently on codifications that are
varied  in  nature  where  the  original  guidance  may  have  been  unclear.  The  amendments  in  ASU  2020-10  are  effective  for  the  Company  for  fiscal  years
beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. Early adoption is permitted. The Company
does not expect the adoption of ASU 2020-10 to have a material impact on its financial statements and related disclosures.

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—
Contracts in Entity’s Own Equity. ASU 2020-06 eliminates the beneficial conversion and cash conversion accounting models for convertible instruments. It
also  amends  the  accounting  for  certain  contracts  in  an  entity’s  own  equity  that  are  currently  accounted  for  as  derivatives  because  of  specific  settlement
provisions. In addition, ASU 2020-06 modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the
diluted EPS computation. The amendments in ASU 2020-06 are effective for smaller reporting companies as defined by the SEC for fiscal years beginning
after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after
December 15, 2020. The Company is currently evaluating the impact of ASU 2020-06 on its financial statements.

In  June  2016,  the  FASB  issued  ASU  No.  2016-13,  Financial  Instruments—Credit  Losses  (Topic  326),  Measurement  of  Credit  Losses  on  Financial
Instruments, as clarified in subsequent amendments. ASU 2016-13 changes the impairment model for certain financial instruments. The new model is a
forward-looking expected loss model and will apply to financial assets subject to credit losses and measured at amortized cost and certain off-balance sheet
credit exposures. This includes loans, held-to-maturity debt securities, loan commitments, financial guarantees and net investments in leases, as well as
trade receivables. For available-for-sale debt securities with unrealized losses, credit losses will be measured in a manner similar to today, except that the
losses  will  be  recognized  as  allowances  rather  than  reductions  in  the  amortized  cost  of  the  securities.  In  October  2019,  the  FASB  voted  to  delay  the
effective date of this standard. Topic 326 will be effective for the Company for fiscal years beginning after December 15, 2022. Early adoption is permitted.
The Company is currently assessing the effect that this ASU will have on its financial position, results of operations, and disclosures.

3. Fair Value Measurements

The Company determines the fair value of financial and non-financial assets and liabilities based on the assumptions that market participants would use in
pricing  the  asset  or  liability  in  an  orderly  transaction  between  market  participants  at  the  measurement  date.  The  identification  of  market  participant
assumptions provides a basis for determining what inputs are to be used for pricing each asset or liability. A fair value hierarchy has been established which
gives precedence to fair value measurements calculated using observable inputs over those using unobservable inputs. This hierarchy prioritized the inputs
into three broad levels as follows:

•

•

•

Level 1: Quoted prices in active markets for identical instruments

Level 2: Other significant observable inputs (including quoted prices in active markets for similar instruments)

Level 3: Significant unobservable inputs (including assumptions in determining the fair value of certain investments)

The  carrying  amounts  of  financial  instruments  such  as  cash  and  cash  equivalents,  restricted  cash,  prepaid  expenses  and  other  current  assets,  accounts
payable, accrued compensation, accrued and other current liabilities approximate the related fair values due to the short maturities of these instruments. As
the long-term debt is subject to variable interest rates that are based on market rates which are regularly reset, considering level 2 inputs, the Company
believes the carrying value of the long-term debt approximates its fair value.

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Assets:

Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. treasuries
U.S. government debt securities
Total short-term marketable securities
Long-term marketable securities:

U.S. treasuries

Total long-term marketable securities

Total assets subject to fair value measurements
   on a recurring basis

Assets:

Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. treasuries
U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
Total short-term marketable securities
Long-term marketable securities

U.S. treasuries
U.S. government debt securities
Total long-term marketable securities

Total assets subject to fair value measurements
   on a recurring basis

Total

Level 1

Level 2

Level 3

December 31, 2021

  $

21,421    $
21,421   

21,421    $
21,421   

—    $
—   

52,146   
3,024   
55,170 

1,993   
1,993   

—   
—   
— 

—   
—   

52,146   
3,024   
55,170 

1,993   
1,993   

  $

78,584    $

21,421    $

57,163    $

Total

Level 1

Level 2

Level 3

December 31, 2020

  $

13,686    $
13,686   

13,686    $
13,686   

—    $
—   

55,349   
11,999   
1,001   
11,543   
79,892 

7,370   
10,501   
17,871   

—   
—   
—   
—   
— 

—   
—   
—   

55,349   
11,999   
1,001   
11,543   
79,892 

7,370   
10,501   
17,871   

  $

111,449    $

13,686    $

97,763    $

— 
— 

— 
— 
— 

— 
— 

—

— 
— 

— 
— 
— 
— 
— 

— 
— 
— 

—

The  Company  estimates  the  fair  value  of  its  money  market  funds,  U.S.  and  foreign  commercial  paper,  U.S.  and  foreign  corporate  debt  securities,  U.S.
treasuries,  and  U.S.  government  debt  securities  by  taking  into  consideration  valuations  obtained  from  third-party  pricing  services.  The  pricing  services
utilize  industry  standard  valuation  models,  including  both  income  and  market-based  approaches,  for  which  all  significant  inputs  are  observable,  either
directly or indirectly, to estimate fair value. These inputs include reported trades of and broker/dealer quotes on the same or similar securities, issuer credit
spreads; benchmark securities; prepayment/default projections based on historical data; and other observable inputs. See Note 4, “Marketable Securities,”
for further information regarding the carrying value of the Company's financial instruments. 

The  Company  had  previously  recorded  a  contingent  consideration  liability  related  to  three  agreements  (the  “Commercial  Agreements”)  with  Ascentage
Pharma  Group  Corp.  Limited,  a  clinical-stage  biopharmaceutical  company  based  in  Hong  Kong  China  (“Ascentage  Pharma”).  See  Note  5,  “License
Revenue,  Agreements  and  Strategic  Investment”.  The  fair  value  of  the  contingent  consideration  liability  at  December  31,  2019  included  inputs  not
observable in the market and thus represented a Level 3 measurement. The probability of achieving the defined milestone events under the Commercial
Agreements  was  estimated  on  a  quarterly  basis  by  the  Company’s  management  using  a  probability-weighted  valuation  approach  model  which  utilized
current stock price and reflected the probability and timing of future issuances of shares. As a result of settlements and changes made to the Commercial
Agreements, there was no contingent consideration liability at December 31, 2021 and 2020.

110

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The  following  table  provides  a  reconciliation  of  contingent  consideration  liabilities  measured  at  fair  value  on  a  recurring  basis  using  significant
unobservable inputs (Level 3) (in thousands):

Balance at December 31, 2019
Additions
Settlements
Change in fair value
Balance at December 31, 2020

Contingent Consideration
Liability Amount

1,131 
— 
(1,098)
(33)
—

  $

In December 2021, the Company recorded a derivative liability relating to an amendment to its loan and security agreement. It comprised of a redemption
conversion feature which met the definition of a derivative instrument, which terms are included in the amended loan and security agreement. See Note 8,
“Term Loan Facility”. The Company classified this instrument as a liability on the balance sheet because the feature was not clearly and closely related to
its host instrument and met the definition of a derivative. The derivative liability was initially recorded at fair value upon issuance of the loan amendment
and is being subsequently remeasured to fair value at each reporting date. Changes in the fair value of the derivative liability are recognized as a component
of other income (expense), net in the statements of operations. There were no adjustments to the fair value of the derivative as of December 31, 2021.

The  following  table  provides  a  reconciliation  of  the  derivative  liability  related  to  debt  measured  at  fair  value  on  a  recurring  basis  using  significant
unobservable inputs (Level 3) (in thousands):

Balance at December 31, 2020
Additions
Conversion
Change in fair value
Balance at December 31, 2021

Derivative Liability related to
Debt Conversion Feature(1)

$

$

— 
1,782 
(819)
— 
963

(1)

Transfers into Level 3 during the year ended December 31, 2021 relate to the call option with Hercules Capital, Inc, where the lender can convert principal debt into
common stock. Transfers out of Level 3 during the year relate to the conversions calls of this option made by Hercules Capitals, Inc.

4. Marketable Securities

Marketable securities, which are classified as available-for-sale, consisted of the following (in thousands):

Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. government debt securities
U.S. treasuries

Total short-term marketable securities
Long-term marketable securities:

U.S. treasuries

Total long-term marketable securities
Total marketable securities

Amortized
Cost Basis

Unrealized
Gains

Unrealized
Losses

Fair
Value

December 31, 2021

  $

21,421    $
21,421   

3,026   
52,186   
55,212   

1,995 
1,995 
78,628    $

  $

111

—    $
—   

—   
—   
—   

— 
— 
—    $

—    $
—   

(2)  
(40)  
(42)  

(2)  
(2)

(44)   $

21,421 
21,421 

3,024 
52,146 
55,170 

1,993 
1,993 
78,584

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
  
  
 
 
 
  
  
  
 
Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
U.S. treasuries

Total short-term marketable securities
Long-term marketable securities

U.S. treasuries
U.S. government debt securities
Total long-term marketable securities
Total marketable securities

Amortized
Cost Basis

Unrealized
Gains

Unrealized
Losses

Fair
Value

December 31, 2020

  $

13,686    $
13,686   

11,998   
1,001   
11,541   
55,350   
79,890   

7,369 
10,498 
17,867 
111,443    $

  $

—    $
—   

1   
—   
2   
2   
5   

1 
3 
4 
9    $

—    $
—   

—   
—   
—   
(3)  
(3)  

—   
—   
— 
(3)   $

13,686 
13,686 

11,999 
1,001 
11,543 
55,349 
79,892 

7,370 
10,501 
17,871 
111,449

At December 31, 2021, the remaining contractual maturities of available-for-sale debt securities were less than two years. There have been no significant
realized  gains  or  losses  on  available-for-sale  debt  securities  for  the  periods  presented.  Available-for-sale  debt  securities  that  were  in  a  continuous  loss
position but were not deemed to be other than temporarily impaired were immaterial at both December 31, 2021 and 2020. The Company does not intend
to and believes it is not more likely than not that it will be required to sell these debt securities before their maturities.

See Note 3, “Fair Value Measurements,” for further information regarding the fair value of the Company's financial instruments.

5. License Revenue, Agreements and Strategic Investment

The Company has entered into license agreements with other pharmaceutical and biotechnology companies. The Company’s accounts receivable balances
may contain billed and unbilled amounts from milestones and other contingent payments. The Company performs a regular review of its customers’ credit
risk  and  payment  histories,  including  payments  made  after  period  end.  Historically,  the  Company  has  not  experienced  credit  loss  from  its  accounts
receivable and, therefore, has not recorded a reserve for estimated credit losses as of December 31, 2021.

In accordance with the license agreements, the Company recognized revenue as follows:

Jocasta Neuroscience, Inc. (1)

2021

Twelve Months Ended December 31,
2020

2019

  $
  $

4,784 
4,784 

 $
 $

—    $
—    $

— 
—

(1)

Jocasta Neuroscience, Inc. was deemed a related party at the effective time the agreement was made on December 17, 2021.

There have been no material changes to the Company’s license agreements in the three and twelve months ended December 31, 2021, except as described
below.

112

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
  
  
 
 
 
  
  
 
 
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
License Agreement with Jocasta Neuroscience, Inc.

In December 2021, the Company signed a License Agreement with Jocasta Neuroscience, Inc. (“the Jocasta Agreement”) to exclusively license its rights in
the α-Klotho asset for development and commercialization, and included a sublicense agreement under the original license agreement with the University
of California, San Francisco. Under the Jocasta Agreement, the Company received a $5.0 million upfront cash payment from Jocasta Neuroscience, Inc.
The Company may also receive additional payments based on development milestones, approval milestones, and sales-based royalties, per indication. The
Jocasta agreement is recognized in accordance with ASC 606, Revenue from Contracts with Customers, and is classified under License Revenue.
Promises that the Company concluded were distinct performance obligations in the License Agreement included: (1) the license of intellectual property and
delivery of know-how, and (2) the transfer of licensed compounds and materials.

In order to determine the transaction price, the Company evaluated all the payments to be received during the duration of the contract. Fixed consideration
exists in the form of the upfront payment. Regulatory milestones and royalties were considered variable consideration. The estimated variable consideration
is  constrained  until  the  Company  determines  it  is  probable  that  a  significant  reversal  in  the  amount  of  cumulative  revenue  recognized  will  not  occur  in
future  periods.  Milestone  payments  are  constrained  and  not  included  in  the  transaction  price  due  to  the  uncertainties  of  research  and  development.  The
Company  will  re-evaluate  the  transaction  price,  including  the  estimated  variable  consideration  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. The Company determined that the initial
transaction price consists of the upfront payment of $5.0 million. The allocation of the transaction price is performed based on standalone selling prices,
which  are  based  on  estimated  amounts  that  the  Company  would  charge  for  a  performance  obligation  if  it  were  sold  separately.  The  transaction  price
allocated to the license of intellectual property and delivery of know-how was recognized upon grant of license and delivery of know-how. The transaction
price allocated the transfer of licensed compounds and materials, will be recognized over time as the materials are delivered. Consideration received in
advance are recorded as deferred revenue and will be recognized as the performance obligations are satisfied.

For the years ended December 31, 2021 and 2020, the Company recognized $4.8 million and zero, respectively, of license revenue, primarily related to the
delivery of a performance obligation consisting of a license of intellectual property and related know-how which was delivered in 2021. For the year ended
December 31, 2021, the Company recorded the $0.2 million as deferred revenue.

License Agreements with Research Institutions

In  May  2019,  the  Company  entered  into  a  license  agreement  with  The  Regents  of  the  University  of  California  on  behalf  its  San  Francisco  campus
(collectively, “UCSF”) which provides the Company the rights to certain patents and related know-how to make, use, sell, offer for sale and import certain
products  and  practice  certain  methods  for  use  in  the  development  of  human  therapeutics,  which  excludes  the  provision  of  services  to  third  parties  for
consideration of any kind. The license to the Company is subject to UCSF’s reserved rights under the licensed intellectual property for educational and
non-commercial research purposes and a requirement to substantially manufacture any licensed products in the United States. The Company is obligated to
use diligent efforts to develop and obtain regulatory approval for at least one product commercialized pursuant to the agreement, and must meet certain
regulatory and development milestones. In June 2019, as part of this license agreement, the Company issued 120,000 shares of its common stock to UCSF.
In  addition,  the  Company  is  obligated  to  pay  an  annual  license  maintenance  fee  and  may  be  obligated  to  make  milestone  payments  or  issue  up  to  an
additional 34,000 shares of its common stock upon the occurrence of specified development events, up to aggregate milestone payments of $13.6 million
for each product licensed under the agreement, and upon commercialization, to make royalty payments in the low single digit percentages (subject to a
specified minimum annual royalty) based on net sales of products commercialized pursuant to the agreement. None of these events had occurred and no
milestone payments or royalty payments had been recognized as of December 31, 2021. The upfront issuance of 120,000 shares of the Company’s common
stock  was  valued  at  $1.0  million  and  recorded  as  additional  paid-in  capital  upon  issuance  in  June  2019.  In  December  2021,  the  Company  entered  an
agreement to exclusively license its rights in the α-Klotho asset to Jocasta Neuroscience, Inc. for development and commercialization. Under the license
agreement, Jocasta Neuroscience, Inc. is, in addition to the payments due to the Company, required to make all payments due to UCSF from the Company
under the UCSF License. See above, “License Agreement with Jocasta Neuroscience, Inc.” for additional information on the Jocasta Agreement.

113

 
 
The Company has also entered into license agreements with various research institutions which have provided the Company with rights to patents, and in
certain  cases,  research  “know-how”  and  proprietary  research  tools  to  research,  develop  and  commercialize  drug  candidates.  In  addition  to  upfront
consideration paid to these various research institutions in either cash or shares of the Company’s common stock, the Company may be obligated to make
milestone  payments,  payable  in  cash  and/or  the  issuance  of  shares  of  the  Company’s  common  stock  upon  achievement  of  certain  specified  clinical
development  and/or  sales  events.  The  contingent  consideration  liability  considered  to  be  a  derivative  associated  with  the  potential  issuance  of  common
stock related to these license agreements was not significant at December 31, 2021 and 2020. To date, none of these events has occurred and no contingent
consideration, milestone or royalty payments have been recognized.

License and Compound Library and Option Agreement

The  Company  is  a  party  to  three  agreements,  two  active  and  one  terminated,  with  Ascentage  Pharma:  (a)  a  compound  library  and  option  agreement
executed in February 2016 granting the Company the right to identify and take licenses to research, develop, and seek and obtain marketing approval for
library compounds for the treatment of indications outside of oncology (the “Library Agreement”), (b) an initial license agreement executed in February
2016 granting the Company rights to an initial Ascentage Pharma compound known as APG1252 (the “APG1252 License Agreement”), and (c) a second
license agreement executed in January 2019 granting the Company rights to a second licensed compound (this second license agreement, the “Bcl License
Agreement”  and  collectively  with  the  Library  Agreement  and  APG1252  License  Agreement,  the  “Commercial  Agreements”).  On  July  30,  2020,  the
Company notified Ascentage Pharma of its termination of the APG1252 License Agreement due to the Company’s decision to prioritize the progression of
other compounds from Ascentage International’s library of Bcl-2 inhibitors, such as UBX1325, a Bcl-xL inhibitor.

The Commercial Agreements referenced above include cash payments of up to $70.3 million as well as the equity payments of up to an aggregate of (a)
933,337 shares of common stock in the event there is only one licensed product, and (b) 1,333,338 shares of common stock in the event there are two or
more licensed products, in each case to be issued based on the Company’s achievement of certain preclinical and clinical development and sales milestone
events. The Company is required to make 80% of all equity payments to Ascentage Pharma and the remaining 20% to an academic institution from whom
Ascentage  Pharma  had  previously  licensed  the  technology.  The  milestones  include  the  advancement  of  additional  compounds  into  Investigational  New
Drug application (“IND”) enabling studies, the filing of an IND, the commencement of clinical studies, Food and Drug Administration (“FDA”) and/or
European Medicines Agency approval, and a net sales threshold. The Bcl License Agreement also includes tiered royalties in the low-single digits based on
sales of licensed products.    

As of December 31, 2021, pursuant to these agreements, the Company had issued 1,269,755 shares of common stock to Ascentage Pharma and 291,944
shares of common stock to the academic institution from whom Ascentage Pharma had previously licensed the technology. In May 2021, the Company
initiated  a  Phase  2a  proof-of-concept  study  of  UBX1325  in  patients  with  diabetic  macular  edema.  As  a  result  of  the  first  patient  dosed  in  the  Phase  2a
UBX1325 study in June 2021, the Company triggered a milestone payment of $2.0 million for Ascentage Pharma, which the Company elected to settle in
shares of the Company’s common stock. At the instruction of Ascentage Pharma, the Company issued 294,775 shares of its common stock to Ascentage
Pharma  as  of  August  2021  with  a  fair  market  value  of  $1.1  million  net  of  withholding  taxes,  and  105,277  shares  of  its  common  stock  to  the  academic
institution with a fair market value of $0.4 million at settlement date. The milestone payment was recognized as research and development expense in the
statement  of  operations  and  comprehensive  loss  during  the  year  ended  December  31,  2021.  The  Company  had  previously  issued  361,664  shares  of  its
common stock with a value of $2.3 million to Ascentage Pharma as of December 31, 2020.

The Commercial Agreements included contingent consideration in the form of additional issuances of shares of the Company’s common stock based on the
achievement of the specified milestones. Upon the July 2020 termination of the license to APG1252, the Company determined that the contingency no
longer  applied  and  adjusted  the  fair  value  of  the  contingent  consideration  liability  to  zero.  To  date,  no  royalties  were  due  from  the  sales  of  licensed
products.

Strategic Investment

The  Company  previously  held  an  equity  investment  in  Ascentage  International,  an  affiliate  of  Ascentage  Pharma.  The  equity  interest  represented  an
insignificant level of ownership in the investee and was recorded within strategic investment on the Company’s condensed balance sheets. The fair value of
the Company’s equity investment in Ascentage International was zero as of December 31, 2021 and 2020. The change in fair value of this investment was
zero and $0.5 million for the years ended December 31, 2021 and 2020, respectively, and was recorded in other expense on the statements of operations
and comprehensive loss.

114

 
 
 
 
 
 
 
The  Company  agreed  to  provide  funding  to  Ascentage  Pharma  for  research  and  development  work  performed  at  a  cost  of  up  to  $2.0  million  through
February 2020. During the year ended December 31, 2020, the research and development expense under the research services agreement was not material
to the Company’s financial statements.

6. Balance Sheet Components

Property and Equipment, Net

Property and equipment, net, consists of the following (in thousands):

Laboratory equipment
Computer equipment
Furniture and fixtures
Leasehold improvements
Total property and equipment
Less: accumulated depreciation and amortization
Construction-in-progress
Total property and equipment, net

December 31,

2021

2020

  $

  $

5,718    $
499   
818   
15,158   
22,193   
(12,258)  
7   
9,942    $

5,960 
501 
825 
15,083 
22,369 
(9,742)
— 
12,627

Depreciation and amortization expense related to property and equipment was $2.9 million, $3.4 million and $2.7 million for the years ended December 31,
2021, 2020 and 2019, respectively.

Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following (in thousands):

Operating lease liability - current portion
Accrued research and development
Liability related to early exercise shares
Accrued other

7. Commitments and Contingencies

Leases

December 31,

2021

2020

  $

  $

4,378    $
1,390 

10   
592   
6,370    $

4,520 
1,638 
21 
371 
6,550

In February 2019, the Company entered into a lease agreement for new office and laboratory space in South San Francisco, California. The term of the
lease agreement commenced in May 2019. The lease has an initial term from occupancy of approximately ten years ending on December 31, 2029 with an
option  to  extend  the  term  for  an  additional  eight  years  at  then-market  rental  rates.  The  total  base  rent  payment  escalates  annually  based  on  a  fixed
percentage beginning from the 13th month of the lease agreement. The Company will also be responsible for the operating expenses and real estate taxes
allocated to the building and common areas. Pursuant to the lease agreement, the landlord provided the Company with a tenant improvement allowance of
$10.7  million,  which  was  included  in  deferred  rent  and  leasehold  improvements  on  the  balance  sheet  at  December  31,  2019.  In  connection  with  the
execution of the lease agreement, the Company delivered a letter of credit of approximately $0.9 million to the landlord.

In May 2016, the Company executed a non-cancellable lease agreement for office and laboratory space in Brisbane, California which commenced in May
2016  and  continues  through  October  2022.  The  lease  agreement  includes  an  escalation  clause  for  increased  rent  and  a  renewal  provision  allowing  the
Company to extend this lease for an additional four years by giving the landlord written notice of the election to exercise the option at least fifteen months
prior to the original expiration of the lease term. The lease provides for monthly base rent amounts escalating over the term of the lease and the lessor
provided the Company a $3.9 million tenant improvement allowance to complete the laboratory and office renovation which was recorded as deferred rent
liability and

115

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
leasehold  improvements  within  property  and  equipment,  net.  In  May  2017,  the  Company  entered  into  an  amendment  to  expand  the  leased  space  and
received a three-month rent holiday for the expanded space.

The Company’s operating leases include various covenants, indemnities, defaults, termination rights, security deposits and other provisions customary for
lease transactions of this nature.

The following table summarizes the components of lease expense, which are included in operating expenses in the Company’s statements of operations and
comprehensive loss (in thousands):

Operating lease expense
Variable lease expense
Sublease income
Impairment of operating lease right-of-use asset

Total lease expense

Year Ended December 31,

2021

2020

  $

  $

  $

4,357 
1,633 
(2,578)    
— 
3,412    $

4,721 
1,168 
— 
1,409 
7,298

Variable lease payments include amounts relating to common area maintenance, real estate taxes and insurance and are recognized in the statements of
operations and comprehensive loss as incurred. Rent expense for the year ended December 31, 2019 was $4.5 million.

The following table summarizes supplemental information related to leases (in thousands):

Cash paid for amounts included in the measurement of lease liabilities

Operating cash flows from operating leases
Weighted-average remaining lease term (years)

Operating leases

Weighted-average discount rate (percentage)

Operating leases

The following table summarizes the maturities of lease liabilities as of December 31, 2021 (in thousands):

2022
2023
2024
2025
2026
Thereafter

Total future minimum lease payments
         Less: Amount representing interest

Present value of future minimum lease payments
         Less: Current portion of operating lease liability
     Noncurrent portion of operating lease liability

Year Ended December 31,

2021

2020

  $

6,653 

  $

5,797 

7.7 

5.9%    

Amount

  $

  $

8.5 

5.8%

6,286 
4,810 
4,964 
5,123 
5,287 
16,892 
43,362 
(8,890)
34,472 
(4,378)
30,094

In  February  2020,  the  Company  completed  its  move  into  the  new  office  and  laboratory  space  in  South  San  Francisco,  exited  its  previous  offices  and
laboratory space in Brisbane, California, and began to actively market this space for sublease. Concurrent with this move and in consideration of real estate
market conditions, in particular due to the COVID-19 pandemic in March 2020, the Company identified indicators of impairment in the related asset group,
which included the leased ROU asset and related leasehold improvements associated with the lease. The Company subsequently evaluated and compared
the  net  book  value  of  the  asset  group  to  the  estimated  undiscounted  future  cash  flows  over  the  remaining  term  of  the  lease  and  concluded  that  an
impairment had occurred. The discounted estimated future cash flows included estimates of sublease rentals through the end of the lease term, which ends
on October 31, 2022, utilizing a discount rate of 3.5% based on the Company’s estimated incremental borrowing rate at that time. The estimated discounted
cash flows were compared to the net book value of the ROU asset and leasehold improvements resulting in an impairment loss of $2.6 million during the
year ended December 31, 2020, which was included in operating expense in the statements of operations and comprehensive loss. No impairment loss was
recorded during the year ended December 31, 2021.

116

 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
   
  
   
  
   
  
   
  
   
   
   
  
   
  
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In February 2021, the Company entered into an agreement to sublease the first floor of the Brisbane, California facility, consisting of approximately 27,000
square feet, to Zymergen, Inc., through August 31, 2022. The base sublease rent rate is $3.53 per rental square foot per month and will increase by 3% on
March 1, 2022 through expiration of the agreement. Additionally, the subtenant is required to pay approximately 41% of operating expenses and property
management  fees  that  the  Company  is  required  to  pay  under  the  lease  for  the  Brisbane,  California  facility.  In  May  2021,  the  Company  entered  into  an
agreement  to  sublease  the  second  floor  of  the  Brisbane,  California  facility,  consisting  of  approximately  11,500  square  feet,  to  CareDx,  Inc.,  through
September 30, 2022. The base sublease rent rate is $1.00 per rental square foot per month through expiration of the agreement. Additionally, the subtenant
is required to pay approximately 30% of operating expenses and property management fees that the Company is required to pay under the lease for the
Brisbane, California facility. The Company incurred initial direct costs of $0.1 million in sublease commissions related to entering into the agreements to
sublease the Brisbane, California facility. To account for the commissions, the Company capitalized the total commissions amount and will amortize the
balance over the term of the sublease. Sublease income was $1.5 million and zero for the years ended December 31, 2021 and 2020, respectively, which
was offset against total rent expense.

In  June  2021,  the  Company  entered  into  an  agreement  to  sublease  a  portion  of  the  first  floor  of  the  South  San  Francisco  facility,  consisting  of
approximately 23,000 square feet, to Freenome Holdings, Inc., through August 31, 2024. The base sublease rent rate is $6.25 per rental square foot per
month  and  will  increase  annually  by  3.5%  through  expiration  of  the  agreement.  Additionally,  the  subtenant  is  required  to  pay  approximately  37%  of
operating expenses and property management fees that the Company is required to pay under the lease for the South San Francisco facility. No impairment
loss was recorded during the year ended December 31, 2021. Sublease income was $1.1 million and zero for the years ended December 31, 2021 and 2020,
respectively, which was offset against total rent expense.

Indemnifications

The Company indemnifies each of its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was
serving  at  the  Company’s  request  in  such  capacity,  as  permitted  under  Delaware  law  and  in  accordance  with  the  Company’s  amended  and  restated
certificate of incorporation and bylaws. The term of the indemnification period lasts as long as an officer or director may be subject to any proceeding
arising out of acts or omissions of such officer or director in such capacity.

The maximum amount of potential future indemnification is unlimited; however, the Company currently holds director and officer liability insurance. This
insurance allows the transfer of risk associated with the Company’s exposure and may enable the Company to recover a portion of any future amounts paid.
The  Company  believes  that  the  fair  value  of  these  potential  indemnification  obligations  is  minimal.  Accordingly,  the  Company  has  not  recognized  any
liabilities relating to these obligations for any period presented.

8. Term Loan Facility

On August 3, 2020, the Company entered into a Loan and Security Agreement (the “Loan Agreement”) with Hercules Capital, Inc. (“Hercules”). Under the
Loan Agreement, Hercules provided the Company with access to a term loan with an aggregate principal amount of up to $80.0 million (the “Term Loan
Facility”), available in four tranches, subject to certain terms and conditions. The first tranche of $25.0 million was advanced to the Company on the date
the Loan Agreement was executed. The milestones for the remaining tranches have not yet been reached and as of December 31, 2021 are not expected to
be  reached  as  they  were  dependent,  in  whole  or  in  part,  upon  continued  advancement  in  the  clinical  development  of  UBX0101  in  patients  with
osteoarthritis of the knee.

On December 15, 2021, the Company entered into an amendment to the Loan and Security Agreement (“the Loan Amendment”). The Loan Amendment
includes a Lender Optional Conversion where after the effective date and until the six-month anniversary of the execution date, the lender may elect to
convert to equity of the Company all or any part of up to twenty percent (20%) of the original principal amount for a maximum amount of $5.0 million. As
of December 31, 2021, the lender had elected to convert $2.3 million of the outstanding principal into equity. The Company incurred approximately $0.1
million in loan issuance costs relating to the amendment, which were offset against the loan proceeds and are accounted for as a loan discount.

The Company expects to make interest only payments through September 1, 2022 and expects to then repay the principal balance and interest in equal
monthly installments through August 1, 2024. Pursuant to the Loan Amendment, the interest only period may extend up to a maximum of 9 months to June
1, 2023 should the company meet specific milestones related to its clinical trials and raising additional capital.

117

 
 
 
 
The Company may prepay advances under the Loan Agreement, in whole or in part, at any time subject to a prepayment charge of up to 1.50% of any
amount prepaid, depending upon when the prepayment occurs. Upon prepayment or repayment of all or any of the term loans under the Term Loan Facility,
the Company is required to pay an end of term fee (“End of Term Fee”) equal to 6.25% of the total aggregate amount of the term loans being prepaid or
repaid, which has been recorded as a discount on the principal balance upon issuance.

Interest on the term loan accrues at a per annum rate equal to the greater of (i) the Wall Street Journal prime rate plus 6.10% and (ii) 9.35%. On December
31, 2021, the rate was 9.35%. Interest expense is calculated using the effective interest method and is inclusive of non-cash amortization of capitalized loan
issuance costs. At December 31, 2021, the effective interest rate was 16.69%.

Under the terms of the Loan Agreement, the Company granted first priority liens and security interests in substantially all of the Company’s assets, other
than intellectual property, as collateral for the obligations thereunder. The Company also granted Hercules the right, at their discretion, to participate in any
closing  of  any  single  subsequent  financing  as  defined  up  to  a  maximum  aggregate  amount  of  $2.0  million.  The  Loan  Agreement  also  contains
representations  and  warranties  by  the  Company  and  Hercules,  indemnification  provisions  in  favor  of  Hercules  and  customary  affirmative  and  negative
covenants (including a liquidity covenant beginning July 1, 2021, requiring the Company to maintain at least $15.0 million in unrestricted cash), and events
of default, including a material adverse change in the Company’s business, payment defaults, breaches of covenants following any applicable cure period,
and a material impairment in the perfection or priority of Hercules’ security interest in the collateral. The substantial doubt regarding the Company’s ability
to continue as a going concern does not constitute a material adverse event under the terms of the Loan Agreement. In the event of default by the Company
under the Loan Agreement, the Company may be required to repay all amounts then outstanding under the Loan Agreement.

We  have  determined  that  the  risk  of  subjective  acceleration  under  the  material  adverse  events  clause  included  in  the  Loan  Agreement  is  remote  and,
therefore, have classified the outstanding principal amount in current and long-term liabilities based on the timing of scheduled principal payments. As of
December 31, 2021, and as of the date of the issuance of these financial statements, the Company was in compliance with all covenants and has not been
notified of an event of default by the lender under the Loan Agreement.

As of December 31, 2021, the carrying value of the term loan consists of $22.7 million principal outstanding less the debt discount and issuance costs of
approximately $2.8 million. The end of term fee of $1.6 million is recognized over the life of the term loan as interest expense using the effective interest
method. The debt issuance costs have been recorded as a debt discount which are being accreted to interest expense through the maturity date of the term
loan.  

Interest expense relating to the term loan, which is included in interest expense in the statements of operations and comprehensive loss, was $3.2 million
and $1.3 million for the years ended December 31, 2021 and 2020, respectively.

Future principal payments for the long-term debt are as follows (in thousands):

2022
2023
2024

Total principal payments

         End of term fee due at maturity in 2024

Total principal and end of term fee payments
         Unamortized discount and debt issuance costs

Present value of remaining debt payments

         Current portion of long-term debt

Long-term debt, net

December 31, 2021

  $

118

  $

3,485 
11,144 
8,073 
22,702 
1,562 
24,264 
(2,800)
21,464 
(3,055)
18,409

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
9. Related Party Transactions

Licensing Revenue – Related Party

In December 2021, the Company entered into a license agreement with Jocasta Neuroscience, Inc. A member of the Board of Directors of the Company is
also  an  affiliate  of  Jocasta  Neuroscience,  Inc.  The  agreement  provides  for  an  upfront  fee  of  $5.0  million  and  the  opportunity  for  future  research  and
development services to be provided. The Company recognized $4.8 million of licensing revenue for the year ended December 31, 2021.

Recourse Notes

In  January  2018,  the  Company  issued  full-recourse  promissory  notes  to  a  non-executive  officer  employee  of  the  Company  for  an  aggregate  principal
amount of $0.2 million with an interest rate of 2.5% per annum. All of the principal was used to early exercise options for 59,322 shares of the Company’s
common stock. In December 2019, the full recourse note was deemed satisfied and superseded by a new full recourse promissory note agreement with a
principal amount of $0.2 million and an interest rate of 1.51% per annum. In January 2021, the non-executive officer employee terminated his employment
with the Company. As at March 31, 2021 the Company reclassified the $0.2 million recorded on the balance sheet in stockholders’ equity as ‘Related party
promissory note for purchase of common stock’ to ‘Promissory notes for purchase of common stock’. The balance was repaid in full by June 30, 2021.

10. Equity Financing

The Company has 10,000,000 shares of convertible preferred stock authorized for issuance, par value of $0.0001 per share. As of December 31, 2021 and
2020, no shares of preferred stock were issued and outstanding.

The Company has 300,000,000 shares of common stock authorized for issuance, par value of $0.0001 per share. Holders of the Company’s common stock
are  entitled  to  one  vote  per  share.  As  of  December  31,  2021  and  2020,  there  were  62,991906  and  53,253,213  shares  of  common  stock  issued  and
outstanding.

At-the-Market Offering

In June 2019, the Company filed a Registration Statement on Form S-3 (the “Shelf Registration Statement”), covering the offering of up to $250.0 million
of  common  stock,  preferred  stock,  debt  securities,  warrants  and  units.  The  Shelf  Registration  Statement  included  a  prospectus  covering  the  offering,
issuance and sale of up to $75.0 million of the Company’s common stock from time to time through an “at-the-market” offering under the Securities Act of
1933, as amended (the “Initial ATM Offering Program”). The SEC declared the Shelf Registration Statement effective on June 6, 2019.

In June 2019, the Company also entered into a sales agreement (the “June 2019 Sales Agreement”) with Cowen and Company, LLC (“Cowen”) to sell
shares of the Company’s common stock, from time to time, with aggregate gross sales proceeds of up to $75.0 million, through the ATM Offering Program
under which Cowen acts as its sales agent. Cowen is entitled to compensation for its services equal to up to 3.0% of the gross proceeds of any shares of
common  stock  sold  through  Cowen  under  the  June  2019  Sales  Agreement.  During  the  year  ended  December  31,  2020,  the  Company  issued  and  sold
5,002,257  shares  of  its  common  stock  through  its  ATM  Offering  Program  and  received  net  proceeds  of  approximately  $37.3  million,  after  deducting
commissions and other offering expenses of $1.3 million.

In July 2020, the Company filed an additional prospectus supplement to the Shelf Registration Statement. This prospectus supplement covers the offering,
issuance and sale of up to an additional $50.0 million of the Company’s common stock from time to time through an additional “at-the-market” offering
under the Securities Act of 1933, as amended (the “Additional ATM Offering Program”). The Initial ATM Offering Program and Additional ATM Offering
Program are collectively called the “ATM Offering Programs”.

In July 2020, the Company entered into a second sales agreement (the “July 2020 Sales Agreement”) with Cowen to sell shares of the Company’s common
stock, from time to time, with aggregate gross sales proceeds of up to $50.0 million, through the Additional ATM Offering Program under which Cowen
will act as its sales agent. The issuance and sale of shares of common stock by the Company pursuant to the July 2020 Sales Agreement are also deemed an
“at-the-market” offering under the Securities Act of 1933, as amended (the “Securities Act”). Cowen is entitled to compensation for its services equal to up
to 3.0% of the gross proceeds of any shares of common stock sold through Cowen under the July 2020 Sales Agreement. During the year ended December
31,  2021,  there  were  1,187,068  shares  of  the  Company’s  common  stock  sold  through  the  Initial  ATM  Offering  Program  and  707,459  shares  of  the
Company’s  common  stock  sold  through  the  Additional  ATM  Offering  Program  and  received  total  net  proceeds  of  approximately  $10.4  million,  after
deducting commissions and other offering expenses of $0.3 million.

119

 
 
 
 
 
Equity Purchase Agreement

On  September  29,  2021,  the  Company  entered  into  an  equity  purchase  agreement  (the  “Purchase  Agreement”  or  “Equity  Purchase  Agreement”)  and  a
registration  rights  agreement  with  Lincoln  Park  Capital  Fund,  LLC  (“Lincoln  Park”  or  “Investor”)  which  provides  for  the  sale  to  Lincoln  Park  up  to
$30,000,000 of shares (the “Purchase Shares”) of its common stock over the thirty-six (36) month term of the Purchase Agreement. In connection with the
Purchase Agreement, Lincoln Park purchased 1,020,408 Purchase Shares at a purchase price of $2.94 per share, for a total gross purchase price of $3.0
million (the “Initial Purchase”), and the Company issued 252,447 shares of common stock to Lincoln Park as a commitment fee in connection with entering
into the Purchase Agreement. The Company recognized $0.8 million of other expense relating to the commitment fee share issuance. As of December 31,
2021,  the  Company  had  initiated  the  purchase  of  an  additional  2.9  million  shares  of  the  Company’s  common  stock  amounting  to  $5.3  million  in  gross
proceeds.

Under the Purchase Agreement, the Company has sole discretion, subject to certain conditions, on any business day selected by the Company to require
Lincoln Park to purchase up to 100,000 shares of common stock (the “Regular Purchase Amount”) at the Purchase Price (as defined below) per purchase
notice (each such purchase, a “Regular Purchase”). The Regular Purchase Amount may be increased as follows: to up to 150,000 shares if the closing price
is not below $3.50, up to 200,000 shares if the closing price is not below $5.00, and up to 250,000 shares if the closing price is not below $7.00. Lincoln
Park’s  committed  obligation  under  each  Regular  Purchase  is  capped  at  $2,000,000,  unless  the  Parties  agree  otherwise.  The  purchase  price  for  Regular
Purchases (the “Purchase Price”) shall be equal to the lesser of: (i) the lowest sale price of the common shares during the Purchase Date, or (ii) the average
of the three (3) lowest closing sale prices of the common shares during the ten (10) business days prior to the Purchase Date.

In addition to Regular Purchases and subject to certain conditions and limitations, the Company in its sole discretion may require Lincoln Park on each
Purchase Date to purchase on the following business day up to the lesser of (i) three (3) times the number of shares purchased pursuant to such Regular
Purchase  or  (ii)  30%  of  the  trading  volume  on  the  Accelerated  Purchase  Date  (the  “Accelerated  Purchase”)  (unless  the  Parties  agree  otherwise)  at  a
purchase price equal to the lesser of 97% of (i) the closing sale price on the Accelerated Purchase Date, or (ii) the Accelerated Purchase Date’s volume
weighted  average  price  (the  “Accelerated  Purchase  Price”).  The  Company  has  the  sole  right  to  set  a  minimum  price  threshold  for  each  Accelerated
Purchase in the notice provided with respect to such Accelerated Purchase and under certain circumstances and in accordance with the Purchase Agreement
the Company may direct multiple Accelerated Purchases in a day.

The  aggregate  number  of  shares  that  the  Company  can  sell  to  Lincoln  Park  under  the  Purchase  Agreement  may  not  exceed  11,065,803  shares  of  the
Common  Shares  (which  is  equal  to  approximately  19.99%  of  the  shares  of  the  Common  Shares  outstanding  immediately  prior  to  the  execution  of  the
Purchase Agreement) (the “Exchange Cap”), unless (i) shareholder approval is obtained to issue Purchase Shares above the Exchange Cap, in which the
Exchange  Cap  will  no  longer  apply,  or  (ii)  the  average  price  of  all  applicable  sales  of  Common  Shares  to  Lincoln  Park  under  the  Purchase  Agreement
equals  or  exceeds  $2.94  per  share;  provided  that  at  no  time  may  Lincoln  Park  (together  with  its  affiliates)  beneficially  own  more  than  9.99%  of  the
Company’s issued and outstanding Common Shares.

The Purchase Agreement contains customary representations, warranties, covenants, closing conditions, indemnification and termination provisions. The
Purchase Agreement may be terminated by the Company at any time, at its sole discretion, without any cost or penalty, by giving one business day notice to
Lincoln Park. Further, Lincoln Park has covenanted not to engage in any direct or indirect short selling or hedging of the Common Shares. There are no
limitations on the use of proceeds, financial or business covenants, restrictions on future financings (other than restrictions on the Company’s ability to
enter into a similar type of agreement or Equity Line of Credit during the Term, excluding an At-The-Market transaction with a registered broker-dealer),
rights of first refusal, participation rights, penalties or liquidated damages in the Purchase Agreement.

120

 
 
11. Corporate Restructuring

In  September  2020,  the  Company’s  board  of  directors  implemented  a  corporate  restructuring  to  align  its  resources  on  cellular  senescence  programs  in
ophthalmology  and  neurology  while  further  extending  operating  capital.  The  restructuring  resulted  in  an  elimination  of  approximately  33  positions,  or
approximately 32% of the Company’s workforce, as of September 30, 2020. The Company incurred a one-time employee benefits and severance charge of
approximately $1.8 million in operating expenses during the year ended December 31, 2020. The related accrual is recorded in accrued compensation on
the balance sheet at December 31, 2020. Restructuring charges incurred under this plan primarily consisted of employee termination benefits. Employee
termination benefits include severance costs, employee-related benefits, and supplemental one-time termination payments. Charges and other costs related
to the workforce reduction and structure realignment, and non-cash share-based compensation credits related to the forfeiture of stock options are included
in operating expenses in the statements of operations and comprehensive loss. Of the total charge, $1.5 million was recorded to research and development
expenses and $0.3 million was recorded to general and administrative expenses during the year ended December 31, 2020. Substantially all cash payments
were paid out in the first quarter of 2021. The Company may also incur additional costs not currently contemplated due to events that may occur as a result
of, or that are associated with, the restructuring.

In February 2022, the Company implemented a corporate restructuring to align its resources to focus on its UBX1325 program while further extending
operating capital. The restructuring is expected to result in an elimination of approximately 32 positions and the Company will incur a one-time employee
benefits and severance charge of approximately $1.8 million in operating expenses in the first half of 2022.

12. Stock-Based Compensation

Summary of Equity Incentive Plans

In March 2018, the Company’s board of directors adopted the Company’s 2018 Incentive Award Plan (the “2018 Plan”). The 2018 Plan was approved by
the Company’s stockholders in April 2018 and became effective in May 2018. The 2018 Plan initially reserved 4,289,936 shares for the issuance of stock
options  as  well  as  any  automatic  annual  increases  in  the  number  of  shares  of  common  stock  reserved  for  future  issuance  under  the  2018  Plan. Awards
granted under the 2018 Plan expire no later than ten years from the date of grant. For stock options, the option price shall not be less than 100% of the
estimated fair value on the day of grant. Options granted typically vest over a four-year period but may be granted with different vesting terms. Unvested
options not exercised at the time of an employee’s termination of employment are added back to the 2018 Plan.

Following the Company’s IPO and in connection with the effectiveness of the 2018 Plan, the 2013 Equity Incentive Plan (the “2013 Plan”) terminated and
no further awards will be granted under that plan. All outstanding awards under the 2013 Plan will continue to be governed by their existing terms and the
shares that remained outstanding for issuance under the 2013 Plan were transferred into the 2018 Plan. As of December 31, 2021, there were in aggregate
13,271,831 shares of common stock authorized for issuance under the 2018 Plan.

Prior to its termination, the 2013 Plan provided for the granting of incentive stock options (“ISOs”), non-statutory stock options (“NSOs”) and restricted
shares to employees, directors, and consultants at the discretion of management and the board of directors. The exercise price of an ISO and NSO shall not
be less than 100% of the estimated fair value of the shares on the date of grant, and the exercise price of an ISO and NSO granted to a 10% stockholder
shall not be less than 110% of the estimated fair value of the shares on the date of grant. For awards granted between September 2017 and February 2018
with an exercise price of $3.42, a deemed fair value ranging from $3.95 to $8.47 per share was used in calculating stock-based compensation expense,
which was determined using management hindsight. Options granted under the 2013 Plan expire no later than ten years from the date of grant and generally
vest over a four-year period but may be granted with different vesting terms. Unvested options not exercised at the time of an employee’s termination of
employment are added back to the 2018 Plan.

Under the 2013 Plan, the Company permitted early exercise of certain stock options prior to vesting. These unvested shares are subject to repurchase by the
Company  at  the  original  issuance  price  in  the  event  the  optionee’s  employment  is  terminated  either  voluntarily  or  involuntarily.  The  amounts  paid  for
shares  purchased  under  an  early  exercise  of  stock  options  and  subject  to  repurchase  by  the  Company  are  reported  as  a  liability  and  reclassified  into
additional paid-in capital as the shares vest.

In March 2020, the Company’s board of directors approved the Company’s 2020 Employment Inducement Incentive Plan (“the 2020 Plan”), to provide for
grants  to  newly  hired  employees  as  a  material  inducement  for  them  to  commence  employment  with  the  Company.  The  2020  Plan  initially  reserved
1,100,000 shares for the issuance of

121

 
stock options, and in November 2020, the Company reserved an additional 1,500,000 shares of common stock for future issuance under the 2020 Plan.
Awards granted under the 2020 Plan expire no later than ten years from the date of grant. For stock options, the option price shall not be less than 100% of
the  estimated  fair  value  on  the  day  of  grant.  Options  granted  typically  vest  over  a  four-year  period  but  may  be  granted  with  different  vesting  terms.
Unvested options not exercised at the time of an employee’s termination of employment are added back to the 2020 Plan. As of December 31, 2021, there
were in aggregate 2,530,000 shares of common stock authorized for issuance under the 2020 Plan.

Equity Incentive Plan Activity

The following sections summarize activity under the Company’s equity incentive plans.

Stock Options, Restricted Stock Units (RSUs) and Performance Stock Units (“PSUs”) Activity

A summary of the Company’s stock option activity under the 2013 Plan, 2018 Plan and 2020 Plan for the year ended December 31, 2021 is as follows:

Balance at December 31, 2020

Shares added
Granted
Exercised
Canceled

Balance at December 31, 2021

Vested and exercisable at December 31, 2021

Vested and expected to vest at December 31, 2021

Shares
Available
for Grant

Outstanding
Options

Weighted-
Average
Exercise
Price

4,270,764     
2,942,007     
(3,629,461)    
—     
1,730,141     
5,313,451     

7,475,472    $
—     
3,062,738     
(430,047)    
(1,441,208)    
8,666,955    $

4,204,083    $

8,666,955    $

6.88     
—     
4.92     
3.64     
8.70     
6.05     

6.55     

6.05     

Weighted-
Average
Remaining
Contract
Term
(in Years)

Aggregate
Intrinsic
Value
(in thousands)  

7.7    $

6.4    $

7.7    $

— 

— 

—

The  total  intrinsic  value  of  options  exercised  was  $1.1  million  and  $1.5  million  for  the  years  ended  December  31,  2021  and  2020,  respectively.  The
weighted-average estimated fair value of stock options granted was $4.88 and $4.83 for the years ended December 31, 2021 and 2020, respectively.

The aggregate intrinsic value of options exercisable was zero and $4.1 million as of December 31, 2021 and 2020, respectively.

In September 2020, the board of directors granted retention stock-based awards to employees covering an aggregate of 3.2 million shares of common stock,
including  options  to  purchase  an  aggregate  of  250,000  shares  of  common  stock  and  2,959,850  of  restricted  stock  units.  The  awards  are  all  time-based
vesting and vest over three to four years.

During the year ended December 31, 2020 the Company issued 13,550 shares in settlement of stock-based compensation awards accounted for as liability
awards. During the year ended December 31, 2021, there were no shares issued in settlement of stock-based compensation awards accounted for as liability
awards.

The following table summarizes the Company’s RSU, RSA and PSU activity for the year ended December 31, 2021:

Unvested at December 31, 2020

Granted
Released
Canceled

Unvested at December 31, 2021

122

Shares

2,922,077    $
566,723    $
(962,693)   $
(535,170)   $
1,990,937    $

Weighted-
Average
Grant Date
Fair Value

3.44 
4.88 
3.36 
3.33 
3.92

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
  
   
      
  
   
      
  
   
      
  
   
      
  
   
   
      
   
      
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
As  of  December  31,  2021,  the  total  stock-based  compensation  cost  related  to  options,  RSAs,  RSUs  and  PSUs  granted  but  not  yet  amortized  was  $23.1
million and will be recognized over a weighted-average period of approximately 3.2 years. The total grant date fair value of RSUs and RSAs vested during
the years ended December 31, 2021 and 2020 was approximately $3.1 million and $1.2 million, respectively.

In March 2020, the board of directors granted the Company’s newly hired Chief Executive Officer stock-based awards covering an aggregate of 1.1 million
shares of common stock, including options to purchase an aggregate of 800,000 shares of common stock, 120,000 RSUs, 150,000 PSUs and 30,000 shares
of common stock. The stock-based awards were granted pursuant to the 2020 Plan.

The 30,000 shares of common stock were fully vested on the date of grant and thus, the related compensation expense of $0.2 million was recognized on
the grant date. The stock options and RSUs will vest subject to continued service through the applicable vesting date.

Valuation of Stock Options

The Company uses the Black-Scholes option-pricing model for determining the estimated fair value and stock-based compensation related to stock options
and ESPP awards. The fair value of stock options granted to employees was estimated on the date of grant using the Black-Scholes option pricing model
using the following assumptions:

Expected term of options (in years)
Expected stock price volatility
Risk-free interest rate
Expected dividend yield

The valuation assumptions were determined as follows:

2021
6.0
85.7%-88.5%
1.08%-1.35%
—

Year Ended December 31,
2020
6.1
92.6%-107.9%
0.29%-0.52%
—

2019
6.1
99.4%-111.3%
1.59%-2.27%
—

Expected Term—The expected term represents the period that the options granted are expected to be outstanding and is determined using the simplified
method (based on the mid-point between the vesting date and the end of the contractual term).

Expected Volatility—The Company used an average historical stock price volatility based on a combined weighted average of the Company’s historical
average  volatility  and  that  of  a  selected  peer  group  of  comparable  public  companies  within  the  biotechnology  and  pharmaceutical  industry  that  were
deemed to be representative of future stock price trends as the Company does not have a sufficient historical trading history of its own common stock. The
Company  will  continue  to  apply  this  process  until  a  sufficient  amount  of  historical  information  regarding  the  volatility  of  its  own  stock  price  becomes
available.

Risk-Free Interest Rate—The Company based the risk-free interest rate over the expected term of the options based on the constant maturity rate of U.S.
Treasury securities with similar maturities as of the date of the grant.

Expected  Dividend  Yield—The  Company  has  never  paid  any  dividends  and  does  not  plan  to  pay  dividends  in  the  foreseeable  future.  Therefore,  the
expected dividend yield is zero.

The fair value of ESPP awards was not material for all periods presented.

Performance Stock Units

The PSUs were originally scheduled to vest as to 50,000 PSUs upon the attainment of (a) a volume-weighted average per share closing trading price of the
Company’s common stock of at least $36.875 over a trailing 30-day period or (b) a change in control transaction in which the price per share to the holders
of the Company’s common stock is at least $36.875 and as to 100,000 PSUs (x) at such time as the Company’s market capitalization reaches at least $2.5
billion, as measured based on the volume weighted-average closing  trading  price  over  a  trailing  30  day  period  or  (y)  a  change  in  control  transaction  in
which the consideration paid to the Company’s stockholders is equal to at least $2.5 billion, as determined by the Company’s board of directors. In January
2021, the board of directors modified the PSUs to vest as to 50,000 PSUs upon the attainment of (a) a volume-weighted average per share closing trading
price of the Company’s common stock of at least $18 over a trailing 30-day period or (b) a change in

123

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
   
   
 
 
   
   
 
 
 
   
 
   
 
 
 
control  transaction  in  which  the  price  per  share  to  the  holders  of  the  Company’s  common  stock  is  at  least  $18.00  and  as  to  100,000  PSUs  upon  the
attainment  of  (x)  a  volume-weighted  average  per  share  closing  trading  price  of  the  Company’s  common  stock  of  at  least  $36.00  over  a  trailing  30-day
period or (y) a change in control transaction in which the price per share to the holders of the Company’s common stock is at least $36.00, as determined by
the Company’s board of directors.

For the PSU awards, the Company used the Monte-Carlo option pricing model to determine the fair value of awards at the date of grant. The Monte-Carlo
option  pricing  model  uses  similar  input  assumptions  as  the  Black-Scholes  model;  however,  it  further  incorporates  into  the  fair-value  determination  the
possibility that the market condition may not be satisfied. Compensation costs related to awards with a market-based condition are recognized regardless of
whether the market condition is ultimately satisfied. Compensation cost is not reversed if the achievement of the market condition does not occur. The total
grant date fair value of the PSU awards was determined to be $0.7 million and will be recognized as compensation expense over the weighted-average
derived service period of approximately 4.3 years. The incremental fair value of the PSUs on the modification date of $31,000 are added to the unamortized
value of the original grant of $569,000 and will be amortized to expense over the new implied service periods of 1.63 years to 2.79 years.

Performance and Market Contingent Stock Options
As of December 31, 2020, there were 87,521 performance and market contingent stock option awards outstanding with a grant date total fair value of $0.3
million.  As  of  December  31,  2020  the  Company  determined  that  the  achievement  of  the  requisite  performance  conditions  was  not  probable  and,  as  a
result, no compensation cost was recognized for these awards.

In  January  2021,  the  board  of  directors  modified  17,479  performance  and  market  contingent  stock  options  with  vesting  conditions  that  required  the
combination  of  a  liquidity  event,  change  of  control  or  IPO  with  a  market  condition  at  prescribed  levels.  The  modification  removed  the  performance
condition  and  lowered  the  market  conditions  to  a  volume-weighted  average  per  share  closing  trading  price  of  the  Company’s  common  stock  of  at  least
$18.00 over a trailing 30-day period for one tranche and at least $36.00 over a trailing 30-day period for the second tranche. The fair value of the options on
the modification date of $81,000 will be amortized to expense over the implied service periods of 1.46 years to 2.52 years.

In  June  2021,  the  board  of  directors  modified  33,370  performance  and  market  contingent  stock  options  with  vesting  conditions  that  required  the
combination  of  a  liquidity  event,  change  of  control  or  IPO  with  a  market  condition  at  prescribed  levels.  The  modification  removed  the  performance
condition and adjusted the market conditions to a date on which the Company attains a valuation of at least one billion dollars measured by the volume-
weighted  average  per  share  closing  trading  price  of  the  Company’s  common  stock  over  a  trailing  30-day  period.  The  fair  value  of  the  options  on  the
modification date of $102,000 will be amortized to expense over the implied service periods of 1.85 years.

As of December 31, 2021, there were 50,849 market contingent stock option awards outstanding with a modification date total fair value of $0.2 million.

2018 Employee Stock Purchase Plan

In March 2018, the Company’s board of directors adopted the Company’s 2018 Employee Stock Purchase Plan (the “2018 ESPP”). The 2018 ESPP was
approved by the Company’s stockholders in April 2018 and became effective on May 2, 2018. The 2018 ESPP reserved 536,242 shares of common stock
for issuance pursuant to future awards, as well as any automatic increases in the number of shares of the Company’s common stock reserved for future
issuance under this plan.  

Under the 2018 ESPP, employees are offered the option to purchase the Company’s common stock at a discount during the offering periods, at semi-annual
intervals,  with  their  accumulated  payroll  deductions.  The  option  purchase  price  will  be  85%  of  the  lower  of  the  closing  trading  price  per  share  at  the
beginning of the offering period or at the purchase date. The 2018 ESPP provides for consecutive offering periods and eligible employees may elect to
withhold up to 15% of their compensation through payroll deductions during the offering period for the purchase of stock. The maximum number of shares
that may be purchased by any one participant is limited to 15,000 shares in each offering period and $25,000 in fair market value during any calendar year
per the Internal Revenue Code limits. The first offering period commenced on September 16, 2018.

124

 
 
 
 
Stock-Based Compensation Expense

The following table sets forth the total stock-based compensation expense for all options granted to employees and nonemployees, including shares sold
through  the  issuance  of  non-recourse  promissory  notes  which  are  considered  to  be  options  for  accounting  purposes,  and  costs  associated  with  the  2018
ESPP included in the Company’s statement of operations (in thousands):

Research and development
General and administrative

Total

2021

Year Ended December 31,
2020

2019

  $

  $

4,809    $
6,744 
11,553    $

6,563    $
7,250 
13,813    $

4,979 
5,873 
10,852

Stock-based  compensation  for  the  year  ended  December  31,  2020  includes  $0.1  million  of  expense  related  to  awards  accounted  for  as  liability  awards.
There was no expense related to awards accounted for as liability awards included in stock-based compensation for the year ended December 31, 2021.

During the years ended December 31, 2021 and 2020, stock-based compensation expense recognized related to nonemployee options was $0.4 million and
$0.3 million, respectively.

13. Net Loss per Common Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of shares outstanding for the period. Diluted net loss per share is
calculated by dividing net loss by the weighted-average number of shares of common stock and potential dilutive common stock equivalents outstanding
during the period if the effect is dilutive.

The calculation of diluted earnings (loss) per share also requires that, to the extent contingencies are satisfied during the period and the presumed issuance
of additional shares as contingent consideration is dilutive to earnings (loss) per share for the period, adjustments to net income or net loss used in the
calculation are required to remove the change in fair value of the contingent consideration liability for the period. Likewise, adjustments to the denominator
are required to reflect the related dilutive shares. In all periods presented, the Company’s outstanding stock options, RSAs, RSUs (including PSUs), early
exercised common stock subject to future vesting, restricted stock accounted for as options, shares subject to the 2018 ESPP and presumed issuance of
additional shares as contingent consideration were excluded from the calculation of diluted net loss per share because their effects were antidilutive.

A reconciliation of the numerators and denominators used in computing net loss from continuing operations per share is as follows (in thousands, except
per share amounts):

2021

December 31,
2020
(in thousands, except share and per share amounts)

2019

Numerator:
Net loss

Denominator:
Weighted average number of shares outstanding—basic
   and diluted
Net loss per share—basic and diluted

  $

(60,725)

 $

(93,844)

 $

(82,177)

55,815,873 
(1.09)

 $

50,864,889 
(1.84)

 $

43,624,807 
(1.88)

  $

125

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
    
 
    
 
  
 
 
  
  
 
Since the Company was in a net loss position for all periods presented, basic net loss per common share is the same as diluted net loss per common share as
the inclusion of all potential common shares outstanding would have been anti-dilutive.

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

Options to purchase common stock
Early exercised common stock subject to future vesting
RSUs
PSUs
Shares subject to the 2018 ESPP
Total

2021
8,666,955   
33,370   
1,990,937   
—   
147,741   
10,839,003   

Year Ended December 31,
2020
7,540,472   
66,741   
2,832,077   
150,000   
111,383   
10,700,673   

2019
6,906,898 
146,915 
325,887 
— 
47,597 
7,427,297

Up  to  55,900  shares  may  be  contingently  issued,  if  certain  performance  conditions  are  met  under  the  Company’s  in-licensing  agreements.  See  Note  5,
“License Revenue, Agreements and Strategic Investment,” to the Company’s financial statements for additional information.

14. Defined Contribution Plan

The Company sponsors a 401(k) Plan that stipulates that eligible employees can elect to contribute to the 401(k) Plan, subject to certain limitations, on a
pretax basis. In January 2019, the Company began to match 4% of employees’ salary. During the years ended December 31, 2021 and 2020, the Company
recorded matching contributions of $0.5 million and $0.6 million, respectively.

15. Income Taxes

The Company has incurred net operating losses for all the periods presented. The Company has not reflected the benefit of any such net operating loss
carryforwards in the accompanying financial statements. The Company has established a full valuation allowance against its deferred tax assets due to the
uncertainty surrounding the realization of such assets. All losses to date have been incurred domestically as the Company has no international operations or
subsidiaries.

No provision for U.S. income taxes exists due to tax losses incurred in all periods presented. All losses incurred were U.S. based.

The  effective  tax  rate  for  the  years  ended  December  31,  2021,  2020  and  2019  is  different  from  the  federal  statutory  rate  primarily  due  to  the  valuation
allowance  against  deferred  tax  assets  as  a  result  of  insufficient  sources  of  income.  The  effective  tax  rate  of  the  Company’s  provision  for  income  taxes
differs from the federal statutory rate as follows:

Taxes at the U.S. statutory income tax rate
State tax, net of federal benefit
Other
Stock-based compensation
Research and development tax credits
Rate change
ASC 740-10
Change in valuation allowance

Total provision for income taxes

2021

Year Ended December 31,
2020

2019

21.0  %  
0.9   
(0.4)  
(1.6)  
3.2   
7.3   
(4.2)  
(26.2)  

—  %  

21.0  %  
—   
1.8   
(1.6)  
2.2   
0.1   
— 
(23.5)  

—  %  

21.0  %
(2.2)  
(0.9)  
(0.5)  
(0.2)  
(3.9)  
—   
(13.3)  

—  %

Deferred income taxes reflect the net tax effects of (a) temporary differences between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes, and (b) operating losses and tax credit carryforwards.

126

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
The tax effects of significant items comprising the Company’s deferred income taxes are as follows:

Deferred tax assets:

Federal and state operating loss carryforwards
Research and development tax credits
Stock-based compensation
Accruals and other
Intangibles
Charitable contributions
Operating lease liabilities

Total deferred tax assets
Deferred tax liabilities:

Operating lease right-of-use assets
Fixed assets
Unrealized gain on equity investment

Total deferred tax liabilities
Valuation allowance
Net deferred tax assets

2021

December 31,

(in thousands)

2020

  $

68,216    $
7,356   
5,232   
837   
3,581   
266   
7,608   
93,096   

(4,698)  
(1,500)  
—   
(6,198)  
(86,898)  

  $

—    $

57,126 
5,411 
4,326 
1,145 
1,181 
254 
8,203 
77,646 

(4,946)
(1,750)
— 
(6,696)
(70,950)
—

The  tax  benefit  of  net  operating  losses,  temporary  differences  and  credit  carryforwards  should  be  recorded  as  an  asset  to  the  extent  that  management
assesses that their realization is "more likely than not." Realization of the future tax benefits is dependent on the Company's ability to generate sufficient
taxable income within the carryforward period. Because of the Company's recent history of operating losses, management believes that recognition of the
deferred tax assets arising from the above-mentioned future tax benefits is currently not likely to be realized and, accordingly, has provided a valuation
allowance.

Realization of the net deferred tax assets is dependent upon future taxable income, if any, the amount and timing of which is uncertain. Based on the weight
of  available  positive  and  negative  objective  evidence,  management  believes  it  more  likely  than  not  that  the  Company’s  deferred  tax  assets  are  not
realizable. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance. The valuation allowance increased by $15.9 million and
$22.1 million during the years ended December 31, 2021 and 2020, respectively.

Net operating losses and tax credit carryforwards as of December 31, 2021 are as follows:

Net operating losses, federal (post December 31, 2017)
Net operating losses, federal (pre January 1, 2018)
Net operating losses, state
Research and development tax credits, federal
Research and development tax credits, California

  $

Amount
(in thousands)

260,405   
64,136   
93,166   
7,173   
6,040   

Expiration Years
Do Not Expire
2029-2037
2029-2036
2034-2041
Indefinite

Federal and state laws impose restrictions on the utilization of net operating loss carryforwards and R&D credit carryforwards in the event of a change in
ownership of the Company, which constitutes an 'ownership change' as defined by Internal Revenue Code Section 382 and 383. The Company experienced
an ownership change in the past that impacts the availability of its net operating losses and tax credits. The amounts indicated in the above tables reflect the
reduction  of  net  operating  losses  and  credit  carryforwards  as  a  result  of  previous  ownership  changes  that  the  Company  experienced.  Should  there  be
additional ownership changes in the future, the Company's ability to utilize existing carryforwards could be substantially restricted.

The Company determines its uncertain tax positions based on a determination of whether and how much of a tax benefit taken by the Company in its tax
filings is more likely than not to be sustained upon examination by the relevant income tax authorities.

127

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The following table summarizes the activity related to the Company’s unrecognized tax benefits:

Gross unrecognized tax benefits at January 1
Additions for tax positions taken in the current year
Reductions for tax positions taken in the prior year
Gross unrecognized tax benefits at December 31

2021

December 31,
2020
(in thousands)

2019

  $

  $

7,142    $
3,457   
2,622   
13,221    $

9,762    $
255   
(2,875)  
7,142    $

3,714 
6,221 
(173)
9,762

If  recognized,  none  of  the  unrecognized  tax  benefits  as  of  December  31,  2021  and  2020  would  reduce  the  annual  effective  tax  rate,  primarily  due  to
corresponding adjustments to the valuation allowance. The Company will recognize both accrued interest and penalties related to unrecognized benefits in
income tax expense. As of December 31, 2021 and 2020, no liability has been recorded for potential interest or penalties. The Company does not expect the
unrecognized tax benefits to change significantly over the next 12 months.

The Company files income tax returns in the U.S. federal jurisdiction and California, Colorado, Delaware, Florida and Massachusetts. The Company is not
currently under audit by the Internal Revenue Service or other similar state or local authorities. All tax years remain open to examination by major taxing
jurisdictions to which the Company is subject.

16. Subsequent Events

In February 2022, the Company implemented a corporate restructuring to align its resources to focus on its UBX1325 program while further extending
operating capital. The restructuring is expected to result in an elimination of approximately 32 positions, or approximately 50% of the Company’s
workforce, by the first half of 2022. The Company will incur a one-time employee benefits and severance charge of approximately $1.8 million in
operating expenses in the first half of 2022.

During the first quarter of 2022, Hercules Capital, Inc. gave notice to convert the remaining convertible debt option into equity of the Company’s common
stock. This resulted in the conversion of $2.7 million of principal debt into common stock, and reducing the outstanding principal under the first tranche to
$20.0 million.

In February 2022, the Company’s Board of Directors approved the granting of retention awards to critical and important Company personnel. The awards
consisted of 1,893,335 stock options and 463,328 restricted stock units with a grant date total fair value of $2.0 million and $0.5 million, respectively.

128

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our chief executive and financial officers, evaluated the effectiveness of our disclosures controls and procedures,
as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as of December 31, 2021. The term “disclosure controls and procedures,” as defined
in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information
required  to  be  disclosed  by  a  company  in  the  reports  that  it  files  or  submits  under  the  Exchange  Act  is  recorded,  processed,  summarized,  and  reported
within  the  time  periods  specified  in  the  SEC’s  rules  and  forms.  Disclosure  controls  and  procedures  include,  without  limitation,  controls  and  procedures
designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and
communicated to the company’s management, including its principal executive and principal financial officers, as appropriate, to allow timely decisions
regarding  required  disclosure.  Management  recognizes  that  any  controls  and  procedures,  no  matter  how  well  designed  and  operated,  can  provide  only
reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible
controls and procedures. Based on the evaluation of our disclosure controls and procedures as of December 31, 2021, our chief executive officer and chief
financial officer concluded that, as of such date, our disclosure controls and procedures were effective at a reasonable assurance level.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-
15(f) under the Securities Exchange Act of 1934. Our internal control over financial reporting is designed 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 in the United States and includes those policies and procedures that:

•

•

•

Pertain to the maintenance of records that accurately and fairly reflect in reasonable detail the transactions and dispositions of the assets of our
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 our receipts and expenditures are being made only in accordance with authorizations of our
management and directors; and

Provide reasonable assurances regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could
have a material adverse effect on our financial statements.

Our  management  assessed  the  effectiveness  of  our  internal  control  over  financial  reporting  as  of  December  31,  2021.  In  making  this  assessment,
management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated
Framework (2013 framework). Based on our assessment, management concluded our internal control over financial reporting was effective as of December
31, 2021, based on the COSO criteria.

Attestation Report of the Registered Public Accounting Firm

This Annual Report on Form 10-K does not include an attestation report of our registered public accounting firm due to an exemption established by the
JOBS Act for “emerging growth companies.”

Inherent Limitations on Effectiveness of Controls and Procedures

In designing and evaluating the 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  the  desired  control  objectives.  In  addition,  the  design  of  disclosure  controls  and
procedures must reflect the fact that there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible
controls and procedures relative to their costs.

129

 
 
 
 
Changes in Internal Control over Financial Reporting

Management  determined  that,  as  of  December  31,  2021,  there  were  no  changes  in  our  internal  control  over  financial  reporting  that  occurred  during  the
fiscal quarter then ended that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information.

None.

Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections.

Not Applicable.

130

 
Item 10. Directors, Executive Officers and Corporate Governance.

PART III

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  sections  titled  “Executive  Officers,”  “Election  of  Directors,”  “Corporate
Governance”  and  “Section  16(a)  Beneficial  Ownership  and  Reporting  Compliance”  in  our  Definitive  Proxy  Statement  with  respect  to  our  2022  Annual
Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 11. Executive Compensation.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Executive  Compensation,”  “Director  Compensation”  and
“Corporate Governance”  in our Definitive Proxy Statement with respect to our 2022 Annual Meeting of Stockholders to be filed with the SEC within 120
days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Security  Ownership  of  Certain  Beneficial  Owners  and
Management” and “Equity Compensation Plan Information” in our Definitive Proxy Statement with respect to our 2022 Annual Meeting of Stockholders to
be filed with the SEC within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Certain  Relationships  and  Related  Party  Transactions”  and
“Corporate Governance” in our Definitive Proxy Statement with respect to our 2022 Annual Meeting of Stockholders to be filed with the SEC within 120
days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 14. Principal Accounting Fees and Services.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Ratification  of  Selection  of  Independent  Registered  Public
Accounting Firm” in our Definitive Proxy Statement with respect to our 2022 Annual Meeting of Stockholders to be filed with the SEC within 120 days
after the end of the fiscal year covered by this Annual Report on Form 10-K.

131

 
Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this report:

1. Financial Statements

PART IV

See Index to Financial Statements in Part II Item 8 of this Annual Report on Form 10-K.

2. Financial Statement Schedules

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

3. Exhibits

132

 
 
Exhibit Index

Incorporated by Reference

Exhibit
Number

1.1

3.1
3.2
4.1
4.2
4.3

4.4

10.1(a)

10.1(b)

10.2(a)

10.2(b)

10.2(c)

10.3(a)#
10.3(b)#
10.4(a)#
10.4(b)#

10.4(c)#

10.4(d)#

10.5#
10.6#

10.7#
10.8#

10.9+

10.10+

10.11†

Description

  Sales Agreement, dated July 31, 2020, by and between Unity Biotechnology, Inc.
and Cowen and Company, LLC.
  Amended and Restated Certificate of Incorporation of Unity Biotechnology, Inc.
  Amended and Restated Bylaws of Unity Biotechnology, Inc.
  Reference is made to exhibits 3.1 through 3.2.
  Form of Common Stock Certificate.
  Amended and Restated Investors’ Rights Agreement, dated as of March 15, 2018,
by and among Unity Biotechnology, Inc. and the investors party thereto.
  Description of Unity’s Securities Registered Pursuant to Section 12 of the
Securities Exchange Act of 1934.
  Lease Agreement, dated as of May  13, 2016, by and between Unity
Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  First Amendment to Lease Agreement, dated as of May 23, 2017, by and between
Unity Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  Space License Agreement, dated as of October 20, 2016, by and between Unity
Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  First Amendment to Space License Agreement, dated as of December 5, 2016, by
and between Unity Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  Second Amendment to Space License Agreement, dated as of January 30, 2017, by
and between Unity Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  2013 Equity Incentive Plan.
  Form of Stock Option Agreement under 2013 Equity Incentive Plan.
  2018 Incentive Award Plan.
  Form of Stock Option Grant Notice and Stock Option Agreement under the 2018
Incentive Award Plan.
  Form of Restricted Stock Award Grant Notice and Restricted Stock Award
Agreement under the 2018 Incentive Award Plan.
  Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit
Award Agreement under the 2018 Incentive Award Plan.
  2018 Employee Stock Purchase Plan.
  Amended and Restated Non-Employee Director Compensation Program (Effective
January 1, 2019)
  Form of Indemnification Agreement for directors and officers.
  Employment Agreement, dated January 29, 2018, by and between Unity
Biotechnology, Inc. and Jamie Dananberg.
  Compound Library and Option Agreement, dated as of February 2, 2016, by and
between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  APG1252 License Agreement, dated as of February 2, 2016, by and between
Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Research Services Agreement, dated as of February 2, 2016, by and between
Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.

133

  Number

Form
10-Q  

Filed
Herewith

  Filing Date
7-31-20

5-7-18
5-7-18

  4-23-18
4-5-18

1.1

3.1
3.2

4.2
4.3

8-K
8-K

S-1
S-1

10-K  

4.4

3-11-20

S-1

  10.1(a)

4-5-18

S-1

  10.1(b)

4-5-18

S-1

  10.2(a)

4-5-18

S-1

  10.2(b)

4-5-18

S-1

  10.2(c)

4-5-18

S-1
S-1
S-1
S-1

  10.3(a)
  10.3(b)
  10.4(a)
  10.4(b)

4-5-18
4-5-18
  4-23-18
4-5-18

S-1

  10.4(c)

4-5-18

S-1

  10.4(d)

4-5-18

S-1
10-K  

10.5
10.6

  4-23-18
3-6-19

S-1
S-1

10.7
10.11

4-5-18
4-5-18

10-K  

10.14

  3-23-21

10-K  

10.15

  3-23-21

S-1

10.16

4-5-18

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10.12+

10.13+

10.14(a)+

10.14(b)+

10.14(c)†

10.14(d)+

10.14(e)+

10.14(f)+

10.14(g)+

10.15+

10.16+

10.17††

10.18

10.19††††

10.20†††

10.21††††

10.22#

  Amendment to APG1252 License Agreement, dated as of February 2, 2016, by
and between Ascentage Pharma Group Corp. Ltd.
  Amendment to Compound Library and Option Agreement, dated as of February 2,
2016, by and between Ascentage Pharma Group Corp. Ltd. and Unity
Biotechnology, Inc.
  Exclusive License Agreement, dated as of June 28, 2013, by and between the
Mayo Foundation for Medical Education and Research and Unity Biotechnology,
Inc.
  Amendment No. 1 to Exclusive License Agreement, dated as of September 10,
2014, by and between the Mayo Foundation for Medical Education and Research
and Unity Biotechnology, Inc.
  Amendment No. 2 to Exclusive License Agreement, dated as of November 17,
2014, by and between the Mayo Foundation for Medical Education and Research
and Unity Biotechnology, Inc.
  Amendment No. 3 to Exclusive License Agreement, dated as of May 5, 2015, by
and between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Amendment No. 4 to Exclusive License Agreement, dated as of September 15,
2016, by and between the Mayo Foundation for Medical Education and Research
and Unity Biotechnology, Inc.
  Addendum to Amendment No. 4 to Exclusive License Agreement, dated as of
September 15, 2016, by and between the Mayo Foundation for Medical Education
and Research and Unity Biotechnology, Inc.
  Amendment No. 5 to Exclusive License Agreement, dated as of October 17, 2016,
by and between the Mayo Foundation for Medical Education and Research and
Unity Biotechnology, Inc.
  Amended and Restated License Agreement, dated as of January 27, 2017, by and
between the Buck Institute for Research on Aging and Unity Biotechnology, Inc.
  License Agreement, dated as of November 3, 2016, by and between The Johns
Hopkins University and Unity Biotechnology, Inc.
  License Agreement for APG1197, dated as of January 2, 2019, by and between
Ascentage Pharma Group Corp. Ltd. And Unity Biotechnology, Inc.
  Lease Agreement, dated as of February 28, 2019, by and between Unity
Biotechnology, Inc. and Bayside Area Development, LLC
  First Amendment to Compound License Agreement for APG1197, dated as of
November 19, 2019, by and between Ascentage Pharma Group Corp. Ltd. and
Unity Biotechnology, Inc.
  Second Amendment to APG1252 License Agreement, dated as of November 19,
2019, by and between Ascentage Pharma Group Corp. Ltd. and Unity
Biotechnology, Inc.
  Second Amendment to Compound Library and Option Agreement, dated as of
January 8, 2020, by and between Ascentage Pharma Group Corp. Ltd. and Unity
Biotechnology, Inc.
  Amendment to Employment Agreement, dated March 9, 2020, by and between
Unity Biotechnology, Inc. and Nathaniel E. David.

134

10-K  

10.17

  3-23-21

10-K  

10.18

  3-23-21

10-K   10.19(a)

  3-23-21

10-K   10.19(b)

  3-23-21

S-1

  10.19(c)

  4-23-18

10-K   10.19(d)

  3-23-21

10-K   10.19(e)

  3-23-21

10-K   10.19(f)

  3-23-21

10-K   10.19(g)

  3-23-21

10-K  

10.20

  3-23-21

10-K  

10.21

  3-23-21

10-K  

10.22

3-6-19

10-K  

10.23

3-6-19

8-K

10.1

  11-25-19

10-K  

10.25

3-11-20

10-K  

10.26

3-11-20

10-K  

10.27

3-11-20

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10-K  

10.29

3-11-20

8-K

10.1

  3-30-20

10-Q  

10.2

5-7-20

8-K

10.1

7-1-20

10-Q  

10.2

11-4-20

10-Q  

10.3

11-4-20

8-K

8-K

8-K

10.1

8-4-20

10.1

  12-15-21  

10.1

9-29-21  

8-K

10.2

9-29-21  

10.23#

10.24#

10.25#

10.26†††

10.27#

10.2/#

10.29†††

10.30

10.31

10.32

23.1
24.1
  31.1

  31.2

  32.1**

101.INS

101.SCH
101.CAL
101.DEF
101.LAB
101.PRE
104

  Amendment to Employment Agreement, dated March 9, 2020, by and between
Unity Biotechnology, Inc. and Jamie Dananberg.
  Employment Agreement, dated March 30, 2020, by and between Unity
Biotechnology, Inc. and Anirvan Ghosh.
  Amended and Restated Non-Employee Director Compensation Program (effective
as of March 30, 2020)
  Third Amendment to Compound License Agreement for APG-1197, dated June
29, 2020, by and between Ascentage Pharma Group Corp. Ltd. and Unity
Biotechnology, Inc.
  Employment Agreement, dated August 1, 2020, by and between Unity
Biotechnology, Inc. and Lynne Sullivan.
  Amendment to Employment Agreement, dated September 1, 2020, by and between
Unity Biotechnology, Inc. and Lynne Sullivan.
  Loan and Security Agreement, dated August 3, 2020, between Unity
Biotechnology, Inc. and Hercules Capital. Inc.

  Amendment No. 1 to Loan and Security Agreement, dated December 15, 2021, by
and between the Company and Hercules Capital, Inc.

  Purchase Agreement, dated September 29, 2021, by and between the Unity
Biotechnology, Inc. and Lincoln Park Capital Fund, LLC.

  Registration Rights Agreement, dated September 29, 2021, by and between Unity
Biotechnology and Lincoln Park Capital Fund, LLC.
  Consent of Independent Registered Public Accounting Firm
  Power of Attorney. Reference is made to the signature page.
  Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-
14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section
302 of the Sarbanes-Oxley Act of 2002.
  Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-
14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section
302 of the Sarbanes-Oxley Act of 2002.
  Certification of Principal Executive Officer and Principal Financial Officer
Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002.
  Inline XBRL Instance Document – the instance document does not appear in the
Interactive Data File because its XBRL tags are embedded within the Inline XBRL
document.
  Inline XBRL Taxonomy Extension Schema Document
  Inline XBRL Taxonomy Extension Calculation Linkbase Document
  Inline XBRL Taxonomy Extension Definition Linkbase Document
  Inline XBRL Taxonomy Extension Label Linkbase Document
  Inline XBRL Taxonomy Extension Presentation Linkbase Document
  Cover Page Interactive Data File (formatted as inline XBRL and contained in
Exhibit 101)

X
X
X

X

X

X

X
X
X
X
X
X

†

††

Confidential treatment has been granted for certain information contained in this exhibit. Such information has been omitted and filed separately
with the Securities and Exchange Commission.
Portions of this exhibit (indicated by asterisks) have been omitted pursuant to a request for confidential treatment filed separately with the Securities
and Exchange Commission.

135

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
 
†††

Portions of this exhibit (indicated by asterisks) have been omitted pursuant to Regulation S-K, Item 601(b)(10). Such omitted information is not
material and would likely cause competitive harm to the registrant if publicly disclosed.

+

†††† Portions of this exhibit (indicated by asterisks) have been omitted pursuant to Regulation S-K, Item 601(b)(10). Such omitted information is not
material and would likely cause competitive harm to the registrant if publicly disclosed. Additionally, schedules and attachments to this exhibit have
been omitted pursuant to Regulation S-K, Item 601(a)(5).
Certain  confidential  portions  of  this  exhibit  have  been  omitted  from  this  exhibit  in  accordance  with  Regulation  S-K  601(b)(10).  Exhibit  being
refiled upon expiration of confidential treatment previously granted by the SEC.
Indicates management contract or compensatory plan.
The certification attached as Exhibit 32.1 that accompanies this Annual Report on Form 10-K is not deemed filed with the Securities and Exchange
Commission and is not to be incorporated by reference into any filing of Unity Biotechnology, Inc. under the Securities Act of 1933, as amended, or
the Securities Exchange Act of 1934, as amended, whether made before or after the date of this Annual Report on Form 10-K, irrespective of any
general incorporation language contained in such filing.

#
**

Item 16. Form 10-K Summary.

None.

136

 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this

Annual Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 15, 2022

Unity Biotechnology, Inc.

By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints each of Anirvan
Ghosh, Alexander Nguyen, and Lynne Sullivan his or her true and lawful attorney-in-fact and agent, with full power of substitution, for him or her and in
his or her name, place and stead, in any and all capacities, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with
all exhibits thereto, and other documents in connection therewith, with the U.S. Securities and Exchange Commission, granting unto said attorneys-in-fact
and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection
therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming that all said attorneys-in-fact and
agents, or their, his or her substitutes or substitutes, may lawfully do or cause to be done by virtue hereof.

137

 
 
 
 
 
 
 
 
 
 
 
 
Pursuant  to  the  requirements  of  the  Securities  Exchange  Act  of  1934,  this  Annual  Report  on  Form  10-K  has  been  signed  by  the  following

persons on behalf of the Registrant in the capacities and on the dates indicated.

Name

Title

Date

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.

/s/ Lynne Sullivan
Lynne Sullivan

/s/ Keith R. Leonard Jr.
Keith R. Leonard Jr.

/s/ Paul L. Berns
Paul L. Berns

/s/ Kristina M. Burow
Kristina M. Burow

/s/ Graham K. Cooper
Graham K. Cooper

/s/ Nathaniel E. David
Nathaniel E. David, Ph.D.

/s/ Gilmore O’Neill
Gilmore O’Neill, M.B.

/s/ Margo Roberts
Margo Roberts, Ph.D.

/s/ Camille D. Samuels
Camille D. Samuels

Chief Executive Officer and Director
(Principal Executive Officer)

Chief Financial Officer
(Principal Financial and Accounting Officer)

  Chairman

  Director

  Director

  Director

  Director

  Director

  Director

  Director

138

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

March 15, 2022

 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
   
 
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
   
 
 
 
Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-3 No. 333-231893) and related Prospectus of Unity Biotechnology, Inc.,

(2) Registration Statement (Form S-8 No. 333- 254619) pertaining to the 2018 Incentive Award Plan and, 2018 Employee Stock Purchase Plan of

Unity Biotechnology, Inc.;

(3) Registration Statement (Form S-8 No. 333- 250926) pertaining to the 2020 Employment Inducement Incentive Award Plan, as amended of

Unity Biotechnology, Inc.;

(4) Registration Statement (Form S-8 No. 333-237474) pertaining to the 2020 Employment Inducement Incentive Plan of Unity Biotechnology,

Inc.;

(5) Registration Statement (Form S-8 No. 333- 237088) pertaining to the 2018 Incentive Award Plan and 2018 Employee Stock Purchase Plan of

Unity Biotechnology, Inc.;

(6) Registration Statement (Form S-8 No. 333-230086) pertaining to the 2018 Incentive Award Plan and 2018 Employee Stock Purchase Plan of

Unity Biotechnology, Inc.; and

(7) Registration Statement (Form S-8 No. 333-224726) pertaining to the 2013 Equity Incentive Plan, 2018 Incentive Award Plan, and 2018

Employee Stock Purchase Plan of Unity Biotechnology, Inc.

of our report dated March 15, 2022, with respect to the financial statements of Unity Biotechnology, Inc. included in this Annual Report (Form 10-K) of
Unity Biotechnology, Inc. for the year ended December 31, 2021.

/s/ Ernst & Young LLP

Redwood City, California
March 15, 2022

 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 31.1

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Anirvan Ghosh, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Unity Biotechnology, Inc. for the year ended December 31, 2021;

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;

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;

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)

(b)

(c)

(d)

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;

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;

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

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)

(b)

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

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 15, 2022

  By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
   
 
   
 
 
Exhibit 31.2

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynne Sullivan, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Unity Biotechnology, Inc. for the year ended December 31, 2021;

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;

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;

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)

(b)

(c)

(d)

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;

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;

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

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)

(b)

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

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 15, 2022

  By:

/s/ Lynne Sullivan
Lynne Sullivan
Chief Financial Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
 
   
 
   
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the Annual Report of Unity Biotechnology, Inc. (the “Company”) on Form 10-K for the year ending December 31, 2021 as filed

with the Securities and Exchange Commission on the date hereof (the “Report”), I, Anirvan Ghosh, Chief Executive Officer of the Company, and Lynne
Sullivan, Chief Financial Officer of the Company, do each hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-
Oxley Act of 2002, that:

(1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the
Company.

Date: March 15, 2022

Date: March 15, 2022

  By:

  By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

/s/ Lynne Sullivan
Lynne Sullivan
Chief Financial Officer
(Principal Financial and Accounting Officer)