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Krystal Biotech, Inc.

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FY2023 Annual Report · Krystal Biotech, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_______________________________________________________________________________

FORM 10-K

______________________________________________________________________________

(Mark One)

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

For the fiscal year ended December 31, 2023

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 001-38210
_______________________________________________________________________________

Krystal Biotech, Inc.

(Exact name of Registrant as specified in its Charter)
_______________________________________________________________________________

Delaware
(State or other jurisdiction of
incorporation or organization)
2100 Wharton Street
Suite 701
Pittsburgh
Pennsylvania
(Address of principal executive offices)

82-1080209
(I.R.S. Employer
Identification No.)

15203
(Zip Code)

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

Registrant’s telephone number, including area code: (412) 586-5830
_______________________________________________________________________________ 

Title of each class

Common Stock

Trading Symbol(s)

KRYS

Name of each exchange on which registered

NASDAQ Global Select Market

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

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

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

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

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

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

Large accelerated filer

Non-accelerated filer

Emerging growth company

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Accelerated filer

Smaller reporting company

☐

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

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section
404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. Yes  ☒    No ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to
previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive
officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

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 common stock held by non-affiliates of the Registrant, based on the closing sales price for such stock on June 30, 2023 as reported by The Nasdaq Stock Market,
was $2.8 billion.

The number of shares of Registrant’s common stock outstanding as of February 19, 2024 was 28,292,616.

Portions of the Registrant’s definitive proxy statement relating to its 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Report where indicated. Such proxy
statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.

 
 
 
 
 
 
 
 
 
 
 
Table of Contents

Business
Risk Factors
Unresolved Staff Comments
Cybersecurity
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 Jurisdiction 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 Accountant Fees and Services

Exhibits and Financial Statement Schedules
Form 10-K Summary

PART I
Item 1.
Item 1A.
Item 1B.
Item 1C.
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.

Signatures

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FORWARD-LOOKING STATEMENTS

This  Annual  Report  on  Form  10-K  contains  “forward-looking  statements”  within  the  meaning  of  Section  27A  of  the  Securities  Act  of  1933,
as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. Forward-looking statements
include all statements that are not historical facts and can be identified by terms such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,”
“intend,”  “may,”  “plan,”  “potential,”  “predict”,  “project,”  “seek,”  “should,”  “target,”  “will,”  “would,”  or  similar  expressions  and  the  negatives  of  those
terms. These statements relate to future events or to our future operating or 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,  performances  or
achievements expressed or implied by the forward-looking statements.

Forward-looking  statements  appearing  in  a  number  of  places  throughout  this  Annual  Report  on  Form  10-K  include,  but  are  not  limited  to,

statements about the following, among other things:

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our commercialization plans in the United States for our first commercial product, VYJUVEK  (beremagene geperpavec-svdt, or B-VEC;
referred to as B-VEC outside the U.S.), which was approved by the United States Food and Drug Administration (“FDA”) in May 2023 for
the treatment of dystrophic epidermolysis bullosa (“DEB”);

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our  expectations  regarding  reimbursement  of  VYJUVEK  in  the  U.S.,  including  coverage  determinations  and  the  timing  thereof  from
commercial health plans and Medicaid;

the timing, scope and results of our regulatory filings and potential approvals for marketing authorizations for B-VEC in the European Union
and Japan,

our expectations regarding the timing of completion of our open label extension study of B-VEC in Japanese patients, and our plans and
expected timing of commercial launch in Europe and Japan;

our plans for commercialization of B-VEC outside of Germany, France, Italy, Spain, the United Kingdom, and Japan;

the potential clinical development path for ophthalmic B-VEC for the treatment of ocular complications of DEB;

the initiation, timing, progress and results of clinical trials for KB407, KB408, KB707 (intratumoral and inhaled), KB105, KB104, KB301,
and  any  other  product  candidates,  including  statements  regarding  the  timing  of  initiation  and  completion  of  studies  or  trials  and  related
preparatory work, the period during which the results of the trials will become available, the timing of our disclosure of study data, and our
research and development programs;

the timing, scope or results of regulatory filings and approvals, marketing and other regulatory approval of our product candidates;

our ability to achieve certain accelerated, orphan drug, and other designations from the FDA or other regulatory authorities;

our estimates regarding the potential market opportunity for any of our product candidates;

our research and development programs for our product candidates;

our plans and ability to successfully develop and commercialize our product candidates;

our ability to identify and develop new product candidates;

our beliefs about our proprietary HSV-1 based vector platform, including its ability to deliver multiple genes and other effectors, which could
enable development of therapies for more common conditions that are not necessarily the result of an inherited genetic defect;

our ability to identify, recruit and retain key personnel;

our commercialization, marketing and manufacturing capabilities and strategy;

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

the scalability and commercial viability of our proprietary manufacturing methods and processes;

the rate and degree of market acceptance and clinical utility of VYJUVEK and our product candidates and gene therapy, in general;

our competitive position;

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our intellectual property position and our ability to protect and enforce our intellectual property;

our financial performance;

our estimates regarding expenses, revenue, capital requirements and needs for or ability to obtain additional capital;

developments and projections relating to our competitors and our industry;

our ability to establish and maintain collaborations;

our ability to successfully resolve any intellectual property or other claims that may be brought against us;

the impact of laws and regulations; and

any  statements  regarding  U.S.  or  global  economic  conditions  and  the  impact  on  our  business,  or  performance  and  any  statement  of
assumptions underlying any of the foregoing.

Forward-looking  statements  are  subject  to  a  number  of  risks,  uncertainties  and  assumptions,  including  those  described  in  “Risk  Factors,”
“Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in this Annual Report. Moreover, we operate in
a very competitive and rapidly changing environment, and new risks emerge from time to time. It is not possible for our management to predict all risks,
nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ
materially  from  those  contained  in  any  forward-looking  statements  we  may  make.  In  light  of  these  risks,  uncertainties  and  assumptions,  the  forward-
looking  events  and  circumstances  discussed  in  this  Annual  Report  may  not  occur  and  actual  results  could  differ  materially  and  adversely  from  those
anticipated  or  implied  in  the  forward-looking  statements.  Given  these  uncertainties,  you  should  not  place  undue  reliance  on  these  forward-looking
statements. You should read this Annual Report completely and with the understanding that our actual future results may be materially different from what
we expect.

Forward-looking statements represent our management’s beliefs and assumptions only as of the date of this Annual Report. Except as required by
law, we assume no obligation to update or revise these forward-looking statements publicly as a result of subsequent events, developments or otherwise, or
to update the reasons actual results could differ 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  and  other  statistical  data  made  by  independent  parties  and  by  the  Company  that
involves a number of assumptions and limitations. Neither the Company nor any other person makes any representation as to the accuracy or completeness
of such data or undertakes any obligation to update such data after the date of this Annual Report.

Throughout this Annual Report, unless the context requires otherwise, all references to “Krystal,” “the Company,” “we,” “our,” “us” or similar

terms refer to Krystal Biotech, Inc., together with its consolidated subsidiaries.

Summary Risk Factors

Our business is subject to a number of risks, including risks that may prevent us from achieving our business objectives or may adversely affect
our business, financial condition, results of operations, cash flows and prospects. These summary risks provide an overview of many of the risks we are
exposed  to  in  the  normal  course  of  our  business  and  are  discussed  more  fully  in  “Risk  Factors”  herein.  These  risks  include,  but  are  not  limited  to,  the
following:

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We are substantially dependent on the commercial success of VYJUVEK.

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

We  face  significant  competition  in  an  environment  of  rapid  technological  change  and  the  possibility  that  our  competitors  may  achieve
regulatory approval before us or develop therapies that are more advanced or effective than ours, which may adversely affect our financial
condition and our ability to successfully market or commercialize VYJUVEK or our product candidates, if approved.

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

Healthcare legislative reform measures may have a material adverse effect on our business and results of operations.

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We are subject, directly or indirectly, to federal and state healthcare fraud and abuse laws, false claims laws and health information privacy
and security laws, and if we are unable to comply, or have not fully complied, with such laws, we could face substantial penalties.

Our internal computer systems, or those of our collaborators or other contractors or consultants, may fail or suffer a cyber-security incident,
such as a data breach or computer virus, which could harm our business by damaging our reputation, exposing us to liability, or materially
disrupting our operations, including production of VYJUVEK or our product development programs.

Our international operations may expose us to business, regulatory, political, operational, financial, pricing and reimbursement and economic
risks associated with doing business outside of the United States.

If we are unable to manage expected growth in the scale and complexity of our operations, our performance may suffer.

If  we  are  unable  to  advance  our  product  candidates  through  clinical  trials,  obtain  regulatory  approval  and  ultimately  commercialize  our
product candidates, or if we experience significant delays in doing so, our business will be materially harmed.

Our  products  may  cause  undesirable  side  effects  or  have  other  properties  that  could  delay  or  prevent  regulatory  approval,  limit  the
commercial potential or result in significant negative consequences following any potential marketing approval.

We rely on third parties to conduct certain aspects of our preclinical studies and clinical trials. If these third parties do not successfully carry
out  their  contractual  duties,  meet  expected  deadlines  or  comply  with  regulatory  requirements,  we  may  not  be  able  to  obtain  regulatory
approval for, or commercialize, our product candidates.

We may encounter substantial delays in our clinical trials, or we may fail to demonstrate safety and efficacy to the satisfaction of applicable
regulatory authorities.

VYJUVEK and our product candidates remain subject to regulatory oversight even after regulatory approval. We will continue to incur costs
related to regulatory compliance and are subject to risks related to non-compliance with or changes to applicable laws and regulations, which
could cause VYJUVEK or any of our product candidates that obtain regulatory approval to lose that approval.

Even though we have obtained FDA approval of VYJUVEK and even if we obtain and maintain approval for our product candidates from
the FDA, we may never obtain approval for them outside of the United States, which would limit our market opportunities and adversely
affect our business.

Delays  in  obtaining  regulatory  approvals  of  the  process  and  facilities  needed  to  manufacture  our  product  candidates  or  disruptions  in  our
manufacturing process may disrupt our production of VYJUVEK or delay or disrupt our development and commercialization efforts with
respect to our product candidates.

Although we have established our own manufacturing facilities for VYJUVEK and our product candidates, we may also utilize third parties
to conduct our product manufacturing or components thereof. Therefore, we are subject to the risk that these third parties may not perform
satisfactorily.

Any  contamination  in  our  manufacturing  process,  shortages  of  raw  materials  or  failure  of  any  of  our  key  suppliers  to  deliver  necessary
components  could  result  in  delays  in  our  ability  to  produce  VYJUVEK  for  commercial  supply  or  any  product  candidate  for  clinical
development.

We  have  limited  experience  as  a  commercial  company  and  the  sales,  marketing,  and  distribution  of  VYJUVEK  or  any  future  approved
products may be unsuccessful or less successful than anticipated.

If  we  are  unable  to  maintain  our  agreements  with  third  parties  to  distribute  VYJUVEK  to  patients  in  the  United  States,  our  results  of
operations and business could be adversely affected.

If we are unable to expand our medical affairs, marketing, market access, sales, and distribution capabilities or collaborate with third parties
to market and sell our product candidates for which we obtain marketing approval, we may be unable to generate sufficient product revenue.

If  the  market  opportunities  for  VYJUVEK  or  our  product  candidates  are  smaller  than  we  believe  they  are,  our  product  revenue  may  be
adversely impacted, and our business may suffer.

Government price controls or other changes in pricing regulation could restrict the amount that we are able to charge for VYJUVEK and our
product candidates, if approved, which would adversely affect our revenue and results of operations.

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The insurance coverage and reimbursement status of newly approved products is uncertain. Failure to obtain or maintain adequate coverage
and reimbursement for VYJUVEK or our product candidates, if approved, could limit our ability to market those products and decrease our
ability to generate product revenue.

If we are unable to obtain and maintain adequate United States and foreign patent protection for VYJUVEK, our current product candidates,
and  any  future  product  candidates  we  may  develop,  and/or  our  vector  platform,  or  if  the  scope  of  the  patent  protection  obtained  is  not
sufficiently broad, our competitors could develop and commercialize products and technologies similar or identical to ours, and our ability to
successfully commercialize VYJUVEK, our current product candidates, any future product candidates we may develop, and our platform
technologies may be adversely affected.

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

Intellectual property rights and regulatory exclusivity rights do not necessarily address all potential threats.

Risks related to our financial position and need for additional capital.

Our Chief Executive Officer and Chairman of the Board of Directors and our founder, President of R&D and director will have the ability to
substantially influence all matters submitted to stockholders for approval.

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Item 1. Business.

Overview

We  are  a  fully  integrated,  commercial-stage  biotechnology  company  focused  on  the  discovery,  development,  and  commercialization  of  genetic
medicines to treat diseases with high unmet medical needs. Our first commercial product, VYJUVEK , was approved by the FDA on May 19, 2023 for the
treatment of DEB, and we subsequently initiated our U.S. commercial launch. VYJUVEK is the first medicine approved by the FDA for the treatment of
DEB.

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Using  our  patented  gene  therapy  technology  platform  that  is  based  on  engineered  HSV-1,  we  create  vectors  that  efficiently  deliver  therapeutic
transgenes to cells of interest in multiple organ systems. The cell’s own machinery then transcribes and translates the encoded effector to treat or prevent
disease. We formulate our vectors for non-invasive or minimally invasive routes of administration at a healthcare professional’s office or in the patient’s
home by a healthcare professional. Our goal is to develop easy-to-use medicines to dramatically improve the lives of patients living with rare and serious
diseases.  Our  innovative  technology  platform  is  supported  by  an  in-house,  FDA-inspected  commercial  scale  Current  Good  Manufacturing  Practice
(“CGMP”) manufacturing facility and a second, completed and qualified, commercial scale CGMP facility to support future expansion.

Our development pipeline includes multiple clinical stage programs for rare and serious diseases, and we are investing in research and development
to advance and grow this pipeline. We possess exclusive rights to develop, manufacture, and commercialize our FDA approved product and our pipeline
candidates throughout the world.

While our focus is on the development of gene therapies to treat patients with severe, life‑threatening, or rare diseases with high unmet medical
needs,  we  are  also  evaluating  the  potential  of  our  platform  to  address  more  prevalent  and/or  non-genetic  conditions.  To  that  end,  in  April  2019,  we
incorporated Jeune Aesthetics, Inc. (“Jeune Aesthetics”), a wholly-owned subsidiary, for the purposes of undertaking preclinical and clinical studies for
aesthetic skin conditions.

Our Redosable Gene Therapy Platform

We believe that certain inherent features of the HSV-1 virus, combined with the modifications we have made to the viral backbone provides our
proprietary  gene  therapy  platform  with  specific  advantages  over  other  viral  and  non-viral  vector  platforms  and  represents  an  opportunity  to  generate  a
portfolio  of  highly  differentiated  and  potentially  first-in-class  or  best-in-class  genetic  medicines.  Advantages  of  our  gene  therapy  technology  platform
include the following:

• Repeat Administration: One of the major challenges with many viral vector platforms is that the host immune system may recognize them as
foreign agents and launch a robust immune response, resulting in toxicity and rapid removal of the virus. Wild-type HSV-1 is known to persist in
the  body  by  becoming  latent  and  hiding  from  the  immune  system.  We  have  harnessed  the  natural  ability  of  HSV-1  to  evade  host-mediated
immunogenicity,  while  removing  specific  viral  elements  that  exacerbate  host  immunity,  thus  making  our  viral  vector  safer  for  repeat
administration as needed to achieve durability of effect. The immune evasive properties of our vector also enable us to treat patients who may
have baseline antibodies to HSV-1, ensuring that prior exposure to the wild-type virus will not limit the number of patients who may be amenable
to treatment with VYJUVEK or our product candidates.

• Non-Integrating Nature:  Upon  entry  into  cells,  the  HSV-1  vector  persists  as  an  episomal  unit  in  the  nucleus,  meaning  it  remains  physically
separate from the host cell chromosome. Certain other viral vectors currently being used in the development of gene therapy treatments, such as
the lentiviral and retroviral vectors, integrate into the host cell DNA to achieve gene expression. Integration into the host cell DNA carries the risk
of  disrupting  host  genes.  In  contrast,  a  non-integrating  vector  such  as  our  HSV-1-based  vector  does  not  carry  the  same  risk  of  disrupting  the
expression of host cell genes.

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Payload Capacity: HSV-1 is a large virus, approximately 150 kilobases, or Kb, of DNA in size. We have made strategic deletions within  this
genome to remove critical “immediate early”, or IE, genes. These IE genes are required for expression of most of the downstream genes that allow
the  HSV-1  virus  to  replicate  and  destroy  host  cells.  Deletion  of  these  IE  genes  inhibits  expression  of  most  of  the  viral  proteins,  making  the
resulting  viral  vector  replication-deficient  and  non-toxic.  These  deletions  also  enable  the  vector  to  easily  accommodate  a  payload  of  35  Kb  or
greater without any significant impact on yield or titer. In VYJUVEK, we have successfully inserted two functional copies of the complete ~9 Kb
human COL7A1 gene. In contrast, packaging capacity for most other vectors being used is at or under ~10 Kb, which limits their ability to deliver
large transgenes. In addition, we believe the high payload capacity of our viral vector will allow us to insert multiple and/or combinations of genes
or effectors that could enable the treatment of non-monogenic conditions.

• High Transduction Efficiency: Poor transduction efficiency has remained a major hurdle for direct delivery of most vectors particularly in the
epithelia of the skin and lung. HSV-1 has a natural affinity, or tropism, for epithelial cells. Consequently, we believe our vector penetrates and
delivers its payload much more efficiently than other vectors,

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resulting in transduction efficiencies or cell penetration as high as 95% in cell-based studies. The greater payload capacity of our vector and the
high  transduction  efficiencies  achieved  allow  us  to  deliver  a  full  gene  (or  genes)  directly  to  any  patient’s  tissues  for  off-the-shelf,  in vivo gene
expression without additional manipulation.

• Direct  Delivery:  Our  engineered  HSV-1  vector  allows  for  noninvasive  or  minimally  invasive  local  gene  delivery.  The  advantages  of  direct
delivery are that our products can be administered in a doctor’s office or the patient’s home, requiring no hospitalization or expensive, invasive,
and  time-consuming  procedures  or  sophisticated  medical  teams.  Taking  gene  therapy  to  the  patient  minimizes  patient  travel  and  circumvents
upfront logistical burdens typical of other gene therapy approaches.

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Stability:  HSV-1  is  extremely  stable  and  resistant  to  degradation  by  physical  shearing,  solvents,  and  enzymes,  facilitating  purification  and
flexibility with final formulation of our product candidates. Our vectors are stable frozen for long-term storage, under refrigerated conditions for
short-term storage and shipment, in addition to being stable over several freeze-thaw cycles. This facilitates our ability to ship VYJUVEK and our
product candidates globally from our manufacturing facilities in Pennsylvania.

• Reproducible and Scalable Manufacturing: Successful production of viral vectors involves two steps: (i) the ‘upstream’ process, which yields a
bulk  virus  harvest;  and  (ii)  the  ‘downstream’  process,  which  involves  purification  and  concentration  of  the  clinical  product.  Successful  and
reproducible  execution  of  both  processes  is  critical  for  commercial  manufacturing.  Our  scientific  team’s  collective  decades  of  experience  and
expertise  in  HSV  engineering  and  purification  has  allowed  us  to  successfully  optimize  our  engineered  HSV-1  vector  production  process  and
develop in-house Chemistry, Manufacturing and Control (“CMC”) capabilities.

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First Approval for Platform Builds on Existing Regulatory Precedent: The first FDA and European Medicines Agency (“EMA”)-approved
oncolytic virus product, Imlygic  by Amgen, for treatment of melanoma, a skin cancer, is based on a genetically engineered HSV-1 virus. Because
this  product  also  employs  an  HSV-1  backbone  for  chronic  administration,  it  created  a  regulatory  precedent  for  approval  of  an  HSV-1-based
chronic gene therapy. Now, with the FDA approval our first platform product, VYJUVEK, regulatory precedent for our proprietary HSV-1-based
platform has also been established, and regulator familiarity with HSV-1 and our platform continues to grow.

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The above listed benefits of our innovative platform, and compatibility with formulation for topical, injectable, and inhaled delivery, make it the

ideal choice to treat diseases and conditions of the skin, lung, and eye.

Our FDA Approved Product and Pipeline

The following table summarizes information regarding our FDA approved product, VYJUVEK, and product candidates in various stages of clinical

and preclinical development as of the date of this Annual Report:

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Our FDA Approved Commercial Product

VYJUVEK (beremagene geperpavec-svdt, or B-VEC; referred to as B-VEC outside the U.S.)

Disease Background

DEB is a rare and severe monogenic skin disease. DEB affects the skin and mucosal tissues and is caused by one or more mutations in a gene
called COL7A1,  which  is  responsible  for  the  formation  of  the  protein  type  VII  collagen  (“COL7”).  COL7  forms  anchoring  fibrils  that  bind  the  dermis
(inner layer of the skin) to the epidermis (outer layer of the skin). In DEB patients, the genetic defect in COL7A1 results in loss or malfunctioning of these
anchoring fibrils, leading to extremely fragile skin that blisters and tears from minor friction or trauma. Those who are born with DEB are sometimes called
“butterfly children,” because their skin is likened to be as fragile as the wings of a butterfly. DEB patients may suffer from open wounds, skin infections,
fusion of fingers and toes, ocular complications that can result in severe vision loss, and gastrointestinal tract problems throughout their lifetime, and may
eventually develop squamous cell carcinoma, a potentially fatal condition. We believe that there are, at present, approximately 3,000 DEB patients in the
United States and approximately 9,000 worldwide. Prior to the approval of VYJUVEK, the standard of care for DEB patients had been limited to palliative
measures that seek to provide relief from some of the symptoms of DEB but do not meaningfully impact disease outcomes.

B-VEC

B-VEC is a redosable, off-the-shelf gene therapy designed to deliver two copies of the COL7A1 gene when applied topically, directly onto an open
wound. Unlike the previous standard of care, B-VEC treats DEB at the molecular level by providing the patient’s skin cells the template to make normal
COL7 protein, thereby addressing the fundamental disease-causing mechanism. B-VEC was specifically designed to be easily administered by a healthcare
professional in a doctor’s office or at the patient’s home. B-VEC was approved by the FDA in May 2023 and is marketed as VYJUVEK in the United
States.

We believe our approach to treating DEB is positively differentiated relative to palliative approaches, which do not address the underlying genetic
cause  of  DEB  or  impact  the  durability  of  wound  closure,  and  other  known  efforts  to  develop  corrective  treatments  that  employ  autologous  approaches.
Autologous treatments use a patient’s own tissues and cells to manufacture an individualized therapy. Such therapies tend to be expensive, invasive and
time consuming to use, and require extensive patient travel, extended hospital stays, highly sophisticated medical teams and procedures.

Commercial Launch

We  launched  VYJUVEK,  the  first  FDA  approved  treatment  for  DEB  and  the  first  and  only  corrective  therapy  for  DEB  globally,  in  the  United
States in the second quarter of 2023. We estimate that there are approximately 3,000 patients in the United States suffering from DEB, of which 1,200 were
identified at launch through claims analytics and pre-launch patient identification activities conducted by our commercial field force. Since our commercial
launch of VYJUVEK in the United States in the second quarter of 2023, we have reported $50.7 million in net product revenue.

Commercial  readiness  efforts  had  been  underway  over  two  years  prior  to  the  FDA  approval  of  VYJUVEK.  In  the  United  States,  prior  to  FDA
approval and VYJUVEK launch, as part of our disease awareness program, our medical science liaisons had been interacting with and educating health
care professionals (“HCPs”) on DEB and the importance of genetic testing in ensuring an accurate diagnosis. We also built-out Krystal Connect
, our U.S.
in-house patient services call center staffed with Krystal employees, which was launched subsequent to FDA approval to assist patients, caregivers and
HCPs  interested  in  accessing  VYJUVEK.  Additionally,  we  hired,  trained  and  deployed  commercial  field  teams  to  educate  on  DEB  and  to  prepare  for
launch of VYJUVEK. Our field force has been fully deployed since launch and is covering both centers of excellence and community physicians treating
patients with DEB.

TM

Our  market  access  team  had  successfully  secured  positive  policies  or  coverage  decisions  from  plans  covering  over  93%  of  commercial  and
Medicaid lives in the United States, including positive coverage determinations from all major commercial national health plans and several regional health
plans. In January 2024, we announced that the United States Centers for Medicare & Medicaid Services (“CMS”) had assigned a permanent and product-
specific J-code (J3401) for VYJUVEK, effective on January 1, 2024.

VYJUVEK is distributed in the U.S. through a limited network of specialty pharmacy providers that administer the medication to patients in their

homes and specialty distributors that distribute VYJUVEK for administration to patients at the site of care.

Preparations and infrastructure buildout are underway in Europe and Japan to support direct commercial launch by Krystal in these regions, which
is expected by 2025. We have also initiated a named patient program in Europe to provide initial access to VYJUVEK. Outside of Germany, France, Italy,
Spain, the United Kingdom, and Japan, our strategy is to enter into distribution arrangements with local distributors to commercialize VYJUVEK.

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Regulatory Status

On May 19, 2023, the FDA approved VYJUVEK, the first ever redosable gene therapy, for treating patients, six months of age or older, suffering
from DEB. No clinical post-marketing commitments or Risk Evaluation and Mitigation Strategies program were required by the FDA. With the approval,
the FDA issued a Rare Pediatric Disease Priority Review Voucher (“PRV”), which confers priority review to a subsequent drug application that would not
otherwise qualify for priority review. We sold the PRV in the third quarter of 2023 for $100.0 million.

The  FDA  had  previously  granted  B-VEC  Orphan  Drug  Designation  (“ODD”),  Fast  Track  Designation,  Rare  Pediatric  Designation,  and  granted

Regenerative Medicine Advanced Therapy to B-VEC for the treatment of DEB.

In  September  2023,  we  received  a  positive  opinion  from  the  EMA  Pediatric  Committee  on  the  Pediatric  Investigation  Plan  for  B-VEC  for  the
treatment of DEB. Based on this positive opinion, we expect to be eligible for up to an additional two years of marketing exclusivity in the European Union
(“EU”),  on  top  of  the  ten-year  EU  market  exclusivity  after  market  approval  in  the  EU.  The  European  regulatory  authorities  have  also  granted  B-VEC
Orphan Designation and PRIority MEdicines eligibility for B-VEC to treat DEB.

In October 2023, we submitted a marketing authorization application (“MAA”) to the EMA for B-VEC for the treatment of DEB in patients from
birth.  In  November  2023,  we  were  notified  that  the  MAA  had  been  validated  and  was  now  under  Committee  for  Medicinal  Products  for  Human  Use
review. We currently expect an EMA decision on our MAA in the second half of 2024.

In December 2023, B-VEC was granted ODD status for the treatment of DEB by the Japan Ministry of Health, Labour and Welfare, a designation
which  confers  specific  benefits  for  orphan  drug  development  including  priority  review  of  applications,  extended  registration  validity,  and  reduced
development costs. We anticipate filing our Japan New Drug Application with Japan’s Pharmaceuticals and Medical Devices Agency (“PMDA”) in the
second half of 2024 enabling a potential authorization in 2025.

Clinical Development

We initiated Phase 1 testing of a topical formulation of B-VEC in May 2018 at Stanford University, and we announced positive interim results from
this  clinical  study  on  two  patients  in  October  2018.  The  Phase  2  portion  of  the  trial  commenced  in  December  2018  at  Stanford  University,  and  we
announced positive interim results from this clinical study on June 24, 2019. In March 2022, results from the complete Phase 1/2 study of topical B-VEC
for the treatment of DEB were published in Nature Medicine.

We initiated a pivotal Phase 3 trial (“GEM-3 trial”) in July 2020. The GEM-3 trial of topical B-VEC for the treatment of DEB was a randomized,
double-blind,  intra-patient  placebo-controlled  multicenter  study  designed  to  evaluate  the  efficacy  and  safety  of  B-VEC  for  patients  suffering  from  both
recessive and dominant forms of DEB. The trial enrolled 31 participants with DEB, aged 6 months or older at time of consent. In each patient, a primary
wound  pair  was  identified  by  the  investigator;  one  wound  was  randomized  to  receive  a  weekly  topical  application  of  B-VEC  and  the  other  to  receive
placebo. These primary wounds were treated once weekly for six months until wound closure. If a wound re-opened at any point during the study, weekly
dosage resumed until closure. The dose administered to each wound was dependent on the size of the wound. A maximum vector dose per patient per week
was defined on the basis of preclinical and clinical safety data. In the event that the maximum dose per patient had not been reached based on dosing of the
primary wounds, the study investigators and patients had the opportunity to select additional “secondary” wounds across which the remaining weekly dose
was  applied.  We  announced  positive  results  from  the  GEM-3  trial  in  November  2021  and  in  December  2022  full  results  from  the  GEM-3  trial  were
published in the New England Journal of Medicine.

Following  completion  of  the  GEM-3  trial,  we  initiated  an  open  label  extension  study  (“OLE”)  to  provide  extension  of  B-VEC  treatment  for
participants who completed study GEM-3 (“rollover participants”) and B-VEC treatment for newly enrolling (“naïve participants”) participants with DEB.
The OLE was a multi-center, open-label study of B-VEC for the topical treatment of DEB wounds. The study enrolled 47 participants in total, comprising
of 24 rollover participants and 23 naïve participants, at five sites in the United States. In April 2022, following feedback from the FDA, we announced that
patients enrolled in the OLE study would have the option to be dosed in their homes by a health care professional. The primary study objective was the
assessment of safety and tolerability of extended dosing with B-VEC in a broader patient population. Various quality of life and participant satisfaction
metrics were also assessed. The OLE study was concluded in the third quarter of 2023, and the safety profile continued to support the overall benefit-risk of
B-VEC, with no new safety concerns noted with extended duration of dosing of B-VEC. We expect to disclose detailed study data at upcoming scientific
meetings or in scientific publications.

In July 2023, the PMDA in Japan officially accepted our OLE study of B-VEC in Japanese patients (the “Japan OLE”). Following that acceptance,
we  initiated  the  Japan  OLE  study  and  completed  study  enrollment.  A  total  of  5  Japanese  DEB  patients  have  been  enrolled.  Details  of  the  study  can  be
found at jrct.niph.go.jp under JRCT ID jRCT2053230075. Nothing

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included on this website shall be deemed incorporated by reference into this Annual Report on Form 10-K. We expect to complete the study in 2024.

Our Pipeline Programs

Ophthalmic B-VEC for Ocular Complications of DEB

Disease Background

Ophthalmology

DEB is a rare and severe monogenic blistering disease that affects not only the skin, but also mucosal tissues dependent on COL7 anchoring fibrils
for maintaining epithelial lining integrity. This includes the eye, where COL7 anchors the corneal epithelium. For a meaningful proportion of DEB patients,
the genetic defect in COL7A1 results in loss or malfunctioning of these anchoring fibrils causing ocular complications, such as corneal erosions, abrasions,
blistering and scarring, that can lead to progressive vision loss.

Over 50% of patients with recessive form of DEB are thought to suffer from ocular complications. Correspondingly, we believe there are over 750
patients  in  the  United  States  and  over  2,000  worldwide  that  are  affected.  Disease  management  varies  from  supportive  care  and  wound  management  to
surgical interventions to remove scar tissue. No corrective or FDA approved therapies are presently available.

Ophthalmic B-VEC

Ophthalmic B-VEC is a redosable eye drop formulation of B-VEC, designed to deliver two copies of the COL7A1 transgene to the epithelial cells
in a patient’s eye to produce COL7 protein. As with VYJUVEK, the goal of therapy with ophthalmic B-VEC is to treat the disease locally, at the molecular
level, by providing the patient’s epithelial cells of the eye the template to make normal COL7 protein, and thereby address the fundamental disease-causing
mechanism.  In  preclinical  studies,  single  and  repeated  topical  B-VEC  administration  to  the  eye  in  a  mouse  corneal  lesion  model  resulted  in  localized
COL7A1 expression with no adverse effects noted histologically.

Ophthalmic B-VEC has been applied topically to the eye of one DEB patient under a compassionate use protocol. The clinical observations of this
compassionate  use  case  were  published  in  the  New  England  Journal  of  Medicine  in  February  2024.  The  patient  presented  with  severe  cicatrizing
conjunctivitis secondary to DEB. Surgical symblepharon lysis of the patient’s right eye with pannus removal was conducted and regular administration of
B-VEC as an eye drop directly to the eye (5×10  PFU/mL) were added to routine post-surgical care, three times weekly for the first two weeks and then
once weekly. B-VEC application frequency was further decreased to once monthly once the corneal epithelium was healed. B-VEC was well tolerated with
no drug related adverse events noted. Full corneal healing was observed at 3 months, as well as significant visual acuity improvement from hand motion to
20/25 by 8 months.

9

In  February  2024,  the  FDA  agreed  with  our  proposed  single  arm,  open  label  study  in  approximately  10  patients  to  enable  approval  of  B-VEC

eyedrops to treat ocular complications secondary to DEB. We plan to initiate this study in the second half of 2024.

Respiratory

KB407 for Cystic Fibrosis (“CF”)

Disease Background

CF is the most common inherited genetic disorder in the United States and is caused by mutations in the cystic fibrosis transmembrane conductance
regulator (“CFTR”) gene. Lack of functional CFTR protein in secretory airway epithelia results in defective Cl-, bicarbonate, and thiocyanate secretion,
coupled with enhanced Na+ absorption and mucus production, leading to dehydration and acidification of the airway surface liquid. CF is characterized by
recurrent chest infections, increased airway secretions, and eventually, respiratory failure. While CF comprises a multiorgan pathology affecting the upper
and  lower  airways,  gastrointestinal  and  reproductive  tracts,  and  the  endocrine  system,  the  primary  cause  of  morbidity  and  mortality  in  CF  is  due  to
progressive lung destruction.

According to the U.S. Cystic Fibrosis Foundation (“CFF”), the median age at death for patients with CF in the United States was 36.6 years in
2022. Currently approved CFTR modulating therapies are limited to patients with specific genetic mutations and there is a significant unmet medical need
for the approximately 10%-15% of patients with CF who have genetic mutations non-amenable to currently approved CFTR small molecule “modulators”.
The CFF estimates that there are close to 40,000 children and adults living with CF in the United States, and an estimated 105,000 people diagnosed with
CF across 94 countries. People of every racial and ethnic group are affected by this debilitating disease.

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KB407

KB407 is a redosable off the-shelf gene therapy designed to deliver two copies of the full-length CFTR transgene directly to the airway epithelia
via  inhaled  (nebulized)  administration.  By  inducing  expression  of  full  length,  normal  CFTR  protein  in  the  lung,  treatment  with  KB407  has  potential  to
restore  ion  and  water  flow  into  and  out  of  lung  cells  to  correct  the  lung  manifestations  of  the  disease  in  patients  regardless  of  their  underlying  genetic
mutation. Preclinical efforts to date have shown that KB407 successfully transduces patient-derived epithelial cells and delivers functional CFTR in vitro in
2D and 3D organotypic systems, and is amendable to non-invasive inhaled administration in vivo, as indicated by successful delivery to the lungs through
the use of a clinically relevant nebulizer in small animal models. Successful delivery and distribution throughout the lung also was observed in a nonhuman
primate.

The FDA and the EMA have granted KB407 ODD and Orphan Designation, respectively, for the treatment of cystic fibrosis, and the FDA has

granted KB407 Rare Pediatric Designation for the treatment of cystic fibrosis.

Clinical Development of KB407

In July 2023, we announced that we had dosed the first patient in our Phase 1 CORAL-1 study evaluating KB407, delivered via a nebulizer, for the
treatment  of  patients  with  CF.  The  CORAL-1  study  is  a  multi-center,  dose-escalation  trial  of  KB407  in  patients  with  CF,  regardless  of  their  underlying
genotype. In the fourth quarter of 2023, we completed the first cohort of the CORAL-1 study with no severe or serious adverse events and, in January
2024,  we  initiated  dosing  in  the  second  of  three  cohorts.  Details  of  the  Phase  1  study  can  be  found  at  www.clinicaltrials.gov  under  NCT  identifier
NCT05504837. Nothing included on this website shall be deemed incorporated by reference into this Annual Report on Form 10-K.

KB408 for Alpha-1 Antitrypsin Deficiency (“AATD”)

Disease Background

AATD is a genetic condition caused by mutations that lead to decreased levels and/or decreased functionality of the alpha-1- antitrypsin (“AAT”)
protein. AATD lung disease is a consequence of diminished or absent functional protein in the lungs due to impaired transport into, and low concentrations
in,  patient  plasma.  Low  AAT  serum  levels  can  result  in  life  threatening,  progressive  pulmonary  impairment  and  severe  respiratory  insufficiency,
manifesting  as  chronic  obstructive  pulmonary  disease  and  panacinar  emphysema.  The  lung  degeneration  observed  in  AATD  patients  derives  from  an
unopposed,  and  therefore  enhanced,  neutrophil  elastase  (“NE”)  activity,  leading  to  an  excessive  degradation  of  elastin,  collagen,  and  fibronectin.  The
absence of proper NE inactivation by functional AAT ultimately results in lung tissue destruction, airway obstruction, and an increased inflammation state
that compromises the integrity of the organ and contributes to an inadequate response to insults, including inefficient pulmonary bacterial clearance.

We estimate that there are over 60,000 patients in the United States and over 250,000 patients globally suffering from severe AATD. Currently,
many AATD patients undergo “augmentation therapy” consisting of weekly intravenous (“IV”) infusions of either plasma-purified AAT or recombinant
AAT. This therapy requires burdensome weekly IV infusions and often includes the risk of exposure to bloodborne pathogens connected with the use of
blood-derived products.

KB408

KB408 is an inhaled (nebulized) formulation of our proprietary vector, designed to deliver two copies of the SERPINA1 transgene that encodes
functional, full-length human AAT protein, for the treatment of AATD. Preclinical studies have shown that KB408 successfully transduces patient-derived
lung epithelial cells in vitro, leading to production and secretion of full-length human AAT protein capable of irreversibly binding its cognate target NE. In
small animal models, analysis of lung tissue biopsies, serum, and bronchoalveolar lavage fluid harvested 24 and 48 hours after inhalation of KB408 shows
secretion of full-length AAT protein, with no evidence of significant or systemic toxicity.

In September 2023, the FDA granted KB408 ODD for the treatment of AATD.

Clinical Development of KB408

In September 2023, we announced that the FDA had accepted our Investigational New Drug (“IND”) application to evaluate KB408, delivered via
a nebulizer, in a clinical trial to treat patients with AATD. In February 2024, the Company dosed the first patient in the KB408 Phase 1 SERPENTINE-1
study  for  the  treatment  of  Alpha-1  Antitrypsin  Deficiency.  SERPENTINE-1  is  a  Phase  1  open-label,  single  dose  escalation  study  in  adult  patients  with
AATD with a PI*ZZ genotype. Three planned dose levels of KB408 will be evaluated in up to 12 patients to evaluate the safety, tolerability, and proof-of-
mechanism of KB408. Cohorts 1 and 2 will focus predominantly on safety with dose escalation and pharmacodynamic activity in the lung will be assessed
at  the  highest  dose  by  bronchoscopy  in  Cohort  3.  The  Company  is  working  closely  with  the  Alpha-1  Foundation  and  their  Therapeutic  Development
Network on the SERPENTINE-1 study and intends to announce interim data from the study in the second half of 2024. Details about the Phase 1 study can
be found at www.clinicaltrials.gov under NCT

10

identifier: NCT06049082. Nothing included on this website shall be deemed incorporated by reference into this Annual Report on Form 10-K.

Oncology

KB707 for Solid Tumors

Disease Background

Cancer is progressive and typically fatal disease for which adequate treatment options are lacking. Despite recent advancements, the treatment of
locally advanced or metastatic solid tumors remains particularly difficult and long-term outcomes are poor. Standard of care treatments are rarely curative,
therapeutic benefits are transient, and the majority of patients with locally advanced or metastatic solid tumors are either ineligible for, or will eventually
exhaust, currently available therapies. Many available therapies are also highly toxic and poorly tolerated by patients.

Cancer  imposes  a  heavy  burden  on  patients  worldwide.  The  World  Health  Organization  lists  cancer  as  a  leading  cause  of  death  globally  and
estimates  that  the  disease  was  responsible  for  nearly  10  million  deaths  in  2020.  Of  these,  an  estimated  5  million  deaths  were  attributed  to  solid  tumor
malignancies of the lung, colon and rectum, liver, stomach, and breast alone. Solid tumor malignancies similarly impose a heavy burden on patients in the
U.S., with the National Cancer Institute estimating that over 300,000 patients will have died from lung, colon and rectum, pancreas, breast, prostate, liver
and bile duct, and melanoma of the skin cancers in 2023.

KB707

KB707is a redosable, immunotherapy designed to deliver genes encoding both human interleukin-2 (“IL-2”) and interleukin-12 (“IL-12”) to the
tumor microenvironment and promote systemic immune-mediated tumor clearance. Two formulations of KB707 are in development, a solution formulation
for transcutaneous injection and an inhaled (nebulized) formulation for lung delivery. IL-2 and IL-12 are secreted cytokines with complementary functions
promoting  cell-mediated  immunity  in  humans.  Both  IL-2  and  IL-12  have  been  shown  to  elicit  anti-tumor  immune  responses  in  preclinical  or  clinical
models  and  have  been  extensively  studied  for  their  potential  in  cancer  immunotherapy.  Despite  promising  signs  of  efficacy,  it  has  proven  difficult  to
effectively harness IL-2 and IL-12 for therapeutic benefit, as systemic administration is often poorly tolerated, and the inherently short half-lives of these
cytokines necessitate high dose levels and extremely frequent dose intervals. KB707 leverages the Company’s HSV-1 vector platform – and its ability to
efficiently deliver a durable DNA payload without active replication and minimal cytotoxicity – to drive local and sustained cytokine expression within the
tumor microenvironment and maximize the therapeutic window and benefit of IL-2 and IL-12.

In preclinical studies, KB707 has been shown to efficiently transduce mammalian cells in vitro leading to the secretion of bioactive IL-2 and IL-12
and drive localized, durable cytokine expression in mouse skin after intradermal injection. Furthermore, in stringent, checkpoint inhibitor refractory ‘cold’
syngeneic  mouse  models,  HSV-1  vector  based  delivery  of  murine  equivalent  IL2  and  IL12  elicited  robust  antitumor  responses  and  survival  benefits,
including  via  intratumoral  injection  in  single  and  dual  flank  B16F10  melanoma  models,  as  well  as  via  intratracheal  delivery  in  a  metastatic  K7M2
osteosarcoma model, with evidence of protection from tumor rechallenge in both models suggestive of prolonged adaptive immunity.

In  July  2023,  the  FDA  granted  intratumoral  KB707  Fast  Track  Designation  for  the  treatment  of  anti-programmed  cell  death  protein-1  (“PD-1”)
relapsed/refractory  locally  advanced  or  metastatic  melanoma.  In  February  2024,  the  FDA  also  granted  inhaled  KB707  Fast  Track  Designation  for  the
treatment of patients with solid tumors with pulmonary metastases that are relapsed or refractory to standard of care therapy.

Clinical Development of KB707

In July 2023, we announced that the FDA had accepted our IND application to evaluate intratumoral KB707 in a clinical trial to treat patients with
locally advanced or metastatic solid tumors. The study, OPAL-1, is an open-label, multi-center, monotherapy, dose escalation and expansion Phase 1 study,
enrolling patients with locally advanced or metastatic solid tumors, who relapsed or are refractory to standard of care, with at least one measurable and
injectable tumor accessible by transcutaneous route. The primary objective of the study is to evaluate safety and tolerability of KB707. Efficacy will also be
assessed  by  multiple  measures  including  overall  response  rate,  progression  free  survival,  and  overall  survival,  and  the  immune  effects  of  KB707
monotherapy will be assessed in tumor tissue, lymph nodes, and blood. The first patient in OPAL-1 was dosed in October 2023 and enrollment is ongoing.
Details  of  the  OPAL-1  study  can  be  found  at  www.clinicaltrials.gov  under  NCT  identifier  NCT05970497.  Nothing  included  on  this  website  shall  be
deemed incorporated by reference into this Annual Report on Form 10-K.

In January 2024, the FDA accepted an amendment to our IND application to evaluate inhaled KB707 in a clinical trial to treat patients with locally
advanced or metastatic solid tumors of the lung. We plan on initiating this open-label, multi-center, monotherapy, dose escalation and expansion Phase 1
study, KYANITE-1, in the first half of 2024. Details of the KYANITE-1

11

study  can  be  found  at  www.clinicaltrials.gov  under  NCT  identifier  NCT06228326.  Nothing  included  on  this  website  shall  be  deemed  incorporated  by
reference into this Annual Report on Form 10-K.

KB105 for TGM1-Deficient Autosomal Recessive Congenital Ichthyosis (“ARCI”)

Disease Background

Dermatology

ARCI is a life-long, severe monogenic skin disease. While a number of genetic mutations have been associated with the development of ARCI, the
most common cause of ARCI is an inactivating mutation in the human TGM1 gene encoding the enzyme transglutaminase-1 (“TGM1”), a protein that is
essential  for  the  proper  formation  of  the  skin  barrier.  Mutations  in  the  TGM1  gene,  and  the  subsequent  disruption  to  the  epidermal  barrier,  leads  to
pronounced  dehydration,  trans-epidermal  exposure  to  unwanted  toxins  and  surface  microorganisms,  and  a  greatly  increased  risk  of  infection.
Transglutaminase-1 deficiency is associated with increased mortality in the neonatal period and has a dramatic impact on quality of life.

Patients suffering from ARCI often exhibit life-long pronounced plate-like scaling of the skin, which is often of a dark color and can cover the
whole  body.  Such  patients  frequently  suffer  from  exposure  of  the  inner  eyelid  surface  due  to  turning  away  of  the  eyelids  from  the  eye  (ectropion),  the
turning outwards of the lips (eclabium), deformities of joint and nasal cartilage (hypoplasia), scarring alopecia (especially at the edge of the scalp) and a
thickening of the skin on the palms of the hands and soles of the feet (palmoplantar keratoderma). Additional complications experienced by ARCI patients
include episodes of sepsis, fluid and electrolyte imbalances due to impaired skin barrier function, and failure to thrive, especially during the neonatal period
and infancy. Severe heat intolerance and nail dystrophy are also frequently observed. There are currently no treatments targeting molecular correction of
this disease. We estimate there are approximately 2,000 to 6,000 patients with of TGM1-deficient ARCI in the United States and Europe.

KB105

KB105 is a redosable, off the-shelf gene therapy designed to deliver two copies of the TGM1 gene when applied topically, directly to a patient’s
exfoliated skin. The goal of direct supplementation of TGM1 protein at the site of administration is local correction and phenotypic improvement. Like B-
VEC, KB105 was designed to be easily administered by a healthcare professional in the doctor’s office or, potentially, at the patient’s home.

The FDA and the EMA have each granted KB105 ODD and Orphan Designation, respectively, for the treatment of TGM1-ARCI, and the FDA has

granted KB105 Fast Track Designation and Rare Pediatric Designation for the treatment of TGM1-ARCI.

Clinical Development of KB105

In September 2019, we initiated a Phase 1/2 trial in TGM1-ARCI patients. In May 2020, initial clinical data from the Phase 1 portion of the study
which enrolled adult patients were presented at the Society for Investigative Dermatology (“SID”) meeting. In August 2020, we initiated the second phase
of our Phase 2 portion of the clinical trial of KB105 to treat ARCI. We enrolled one patient in whom four rectangular 100cm2 (4-inch x 4-inch) areas of
skin were selected as Target Areas (TAs). Each treatment area was assigned to receive repeat doses of 4.0x10  PFU (n=2 treatment areas) or 1.0x10  PFU
(n=2 treatment areas). Each area was dosed on Day 1 and 3, after which dosing continued either every 3 days (n=2 treatment areas) or every 6 days (n=2
treatment  areas)  up  to  day  30.  Treatment  areas  were  clinically  evaluated  at  pre-  and  post-KB105  application  timepoints  using  a  5-point  IGA  scale  (0  =
clear; 1 = almost clear; 2 = mild; 3 = moderate; 4 = very severe). In July 2021, we announced initial Phase 2 data.

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9

Repeated  topical  doses  of  KB105  were  well  tolerated,  and  no  drug-related  adverse  effects  were  reported.  No  vector  shedding  or  systemic  viral
exposure was detected at any time point. Improvement on the IGA scale was observed in each treatment area, with the maximum effect observed in TA3
and TA4 that received the highest dose; at day 27, the investigator assigned an IGA score of 2, which was improved as compared to baseline score of 4 in
each area. Variable 1-point improvements were observed at other time points and in the treatment areas that received the lowest dose. As in the Phase 1
portion of the trial, TGM1 turnover was observed to be variable but relatively rapid, and the observed IGA improvements were not sustained through day
60.

We plan to resume enrollment in the Phase 2 portion of this trial later in 2024.

KB104 for Netherton Syndrome

Disease Background

Netherton  Syndrome  is  a  debilitating  monogenic  autosomal  recessive  skin  disorder.  The  disease  arises  due  to  mutations  in  the  SPINK5  gene,
resulting  in  loss  of  activity  of  its  encoded  serine  protease  inhibitor  Kazal-type  5  (“SPINK5”),  also  known  as  Lympho-Epithelial  Kazal  type-related
Inhibitor. In healthy individuals, SPINK5 is one of the serine protease inhibitors

12

expressed in the outermost layers of the skin, and it plays a critical role in the regulation of serine proteases which hydrolyze extracellular proteins that hold
corneocytes  together.  In  patients  suffering  from  Netherton  Syndrome,  the  suppressive  effects  of  SPINK5  on  these  serine  proteases  are  abolished  due  to
underlying genetic mutations in the SPINK5 gene. Consequently, hyperactivated serine proteases in the skin cause uncontrolled desquamation, leading to a
defective skin barrier.

In infants, severe Netherton Syndrome can be associated with failure to thrive, hypernatremic dehydration secondary to excess fluid loss, delayed
growth,  short  stature,  and  recurrent  infections.  Clinically,  Netherton  Syndrome  is  characterized  by  congenital  ichthyosiform  erythroderma,  hair  shaft
defects, recurrent infections, and a defective skin barrier. A predisposition to allergies, asthma, and eczema is also characteristic of Netherton Syndrome.
Ultimately, those afflicted by Netherton Syndrome often experience chronic skin inflammation, severe dehydration, and stunted growth.

There are approximately 38,000 cases of patients with Netherton Syndrome worldwide and about 700 new cases per year globally. There are no
current  approved  treatments  for  Netherton  Syndrome.  Existing  approaches  are  limited  to  palliative  treatments,  including  topical  moisturizers,  repair
formulas and steroids.

KB104

KB104 is a redosable off-the-shelf gene therapy designed to deliver two copies of the SPINK5 gene to relevant skin cells when applied topically.
By directly supplementing the skin with functional SPINK5, the goal of therapy is to locally correct the desquamation and improve the barrier function of
the skin. In preclinical testing, a properly localized human SPINK5 gene was detected 48 hours after topical KB104 application in mice without toxicity.
KB104-mediated human SPINK5 was expressed in the correct layer of skin at the transcript and protein levels.

The FDA has granted KB104 Rare Pediatric Designation for the treatment of Netherton Syndrome.

We plan to file an IND application with the FDA and initiate a clinical trial of KB104 in Netherton Syndrome following initiation of the KB105

Phase 2 study.

While our focus is on the development of gene therapies to treat patients with severe, life‑threatening, or rare diseases with high unmet medical
needs,  we  are  also  evaluating  the  potential  of  our  platform  to  address  more  prevalent  and/or  non-genetic  conditions.  To  that  end,  in  April  2019,  we
incorporated Jeune Aesthetics, a wholly-owned subsidiary, for the purposes of undertaking preclinical and clinical studies for aesthetic skin conditions.

Aesthetics

KB301 for Aesthetic Skin Conditions

Background

The  skin  is  largely  composed  of  collagen-rich  connective  tissue,  with  dermal  collagen,  composed  primarily  of  types  1  and  3  collagen  fibrils,
representing  >90%  (dry  weight)  of  human  skin.  The  characteristics  of  skin  aging  are  largely  due  to  aberrant  collagen  homeostasis,  including  reduced
collagen biosynthesis, increased collagen fibril fragmentation, and progressive loss of dermal collagen culminating in a net collagen deficiency, resulting
from both intrinsic (e.g., passage of time, genetics) and extrinsic (e.g., chronic light exposure, pollution) pressures.

Facial  injectables,  including  hyaluronic  acid,  botulinum  toxin  type  A,  collagen,  polymer  fillers,  and  calcium  hydroxyapatite  microparticles,  are
intended to correct perceived facial defects (e.g., fine lines, shallow wrinkles, and deeper furrows), and are administered for both cosmetic and therapeutic
indications. The global aesthetic injectable market was valued at $8.5 billion in 2022 and is projected to grow to $13.8 billion by 2030. The United States
remains  the  largest  market  but  emerging  markets’  growth  rates  are  significant.  The  growth  drivers  are  expanded  access  to  services  at  medical  spas  and
beauty bars combined with growing consumer purchasing power, especially in emerging markets. Shifting consumer attitudes about wellness, beauty and
healthy aging have increased awareness and acceptance of aesthetics, generating demand from new patient segments, including men and millennials.

KB301

KB301  leverages  our  clinical  experience  in  delivering  genes  of  interest  to  the  skin  and  is  designed  to  stimulate  biorejuvenation  of  the  skin  via
delivery of the gene that encodes for type III collagen when administered via intradermal injection. We believe that our approach of directed expression of
full-length  human  type  III  collagen  via  intradermal  application  of  KB301  provides  a  unique  and  straightforward  approach  to  restoring  collagen
homeostasis, and by extension, reconstructing an optimal physiologic environment in the skin to treat wrinkles or other presentations of aged or damaged
skin.

Clinical Development of KB301

We initiated a Phase 1 clinical trial, the PEARL-1 trial, for the treatment of aesthetic skin conditions in August 2020. The Phase 1 dose-ranging

trial evaluated the safety, tolerability, and initial efficacy of intradermal injections of KB301 in adult

13

subjects aged 18-75. KB301 was well tolerated, and we were able to biopsy and demonstrate proof-of-mechanism. Complete results from Cohort 1 focused
on safety were presented at the 2021 SID Annual Meeting.

In March 2022, we announced positive proof-of-concept efficacy and safety data from Cohort 2 of the PEARL-1 study of KB301 for the treatment
of aesthetic skin indications. Cohort 2 was a randomized, double-blind, placebo-controlled clinical trial that evaluated the safety and efficacy of KB301 for
the  improvement  of  fine  lines  and  skin  texture  in  the  lower  and  upper  cheek  and  for  improvement  in  skin  thickness  in  the  knee.  Cohort  2  enrolled  27
subjects  across  two  trial  sites.  Bilateral  treatment  areas  included  the  neck  behind  the  ear  to  assess  initial  safety  and  on  the  cheek  below  and  above  the
zygomatic arch (lower and upper cheek), and around the knee. Subjects were randomized 2:1 to receive low dose KB301 or placebo in the upper cheek and
knee as multiple micro depot injections over the selected treatment area with a 33 G needle. Subjects receiving KB301 in the lower check were randomized
2:1 to receive either low dose KB301, high dose KB301 or placebo. Four patients dropped out of the Cohort 2 study – one subject following the initial
safety assessment behind the ear, two subjects for unspecified reasons, and one subject due to unevenness in face between active and placebo during the
study.

A  subset  of  subjects  from  the  PEARL-1  Cohort  2  trial  were  enrolled  into  a  durability  trial  to  look  for  duration  of  effect,  reduction  of  the
unevenness in placebo treated sites, and for long term safety monitoring. Ten subjects were enrolled in the durability trial, an open-label extension study to
assess duration of effect below the zygomatic arch (the lower cheek area). The durability trial enrolled subjects who had received the high dose regimen of
KB301 during the PEARL-1 Cohort 2 trial in one or both of their lower cheeks. Subject Satisfaction Scores and Investigator Assessments were measured
monthly  for  three  consecutive  visits  that  correspond  to  timepoints  up  to  nine-months  following  administration  of  the  last  dose  of  KB301.  In  addition,
subjects  with  placebo-treated  lower  cheeks  were  dosed  with  KB301  during  the  durability  trial  to  normalize  their  appearance.  In  November  2022,  we
announced nine-month durability of effect in Cohort 2 of the PEARL-1 study of KB301.

In April 2023, we initiated and treated the first subject in the PEARL-1 Cohort 3 study. The PEARL-1 Cohort 3 study is an open label study to
evaluate different doses of KB301 for the improvement of lateral canthal lines (“LCL”) at rest in up to 20 subjects. Jeune Aesthetics initiated and treated
the first subject in the PEARL-1 Cohort 4 study in January 2024, an open label study to evaluate KB301 for the improvement of dynamic wrinkles of the
décolleté in up to 20 subjects. The Cohort 3 and Cohort 4 studies are running simultaneously and Jeune Aesthetics expects to announce results for both
cohorts in the first half of 2024. Following completion of these cohorts, Jeune Aesthetics plans to initiate a Phase 2 study of KB301. Details of the Phase 1
study  can  be  found  at  www.clinicaltrials.gov  under  NCT  identifier  NCT04540900.  Nothing  included  on  this  website  shall  be  deemed  incorporated  by
reference into this Annual Report on Form 10-K.

Future Opportunities

In  addition  to  the  programs  specified  herein,  we  are  also  conducting  exploratory  preclinical  research  and  development  to  expand  potential
applications of proprietary HSV-1 based vector platform. Research focus areas include the development of new candidates for the treatment of additional
monogenic rare diseases in the skin, lung, and eye, as well as exploration of new routes of administration to treat diseases in additional tissues. We also
believe the ability to redose, as well as the large payload capacity of our proprietary vectors, will allow us to deliver multiple genes and other effectors,
which could enable development of therapies for more common conditions that are not necessarily the result of an inherited genetic defect, such as KB707.
As additional proof-of concept we have generated a library of vectors designed to deliver anti-inflammatory antibodies. Further, we evaluated one of these
vectors in an animal model of atopic dermatitis where expression of the vector-encoded-antibody was confirmed, and efficacy was observed.

If we are able to successfully generate product candidates to treat these more common conditions, we intend to seek collaborative alliances towards

the development and potential commercialization of these therapies.

Manufacturing

In-House CGMP Facilities

We  have  built  in-house  CGMP  facilities  to  enable  better  quality  control,  shorten  lead  times,  lower  costs  and  strengthen  command  over  our
intellectual property. Our first facility, ANCORIS, a commercial scale CGMP-compliant manufacturing facility, is producing VYJUVEK for commercial
sales. In December 2022, the FDA completed a successful audit of our ANCORIS facility.

Our second commercial scale CGMP facility, ASTRA, was completed and qualified in 2023. It is a state-of-the-art CGMP manufacturing facility
that, in addition to adding significant capacity to support our growing pipeline, also allows for in-house incorporation of raw material preparation, excipient
manufacturing, testing, packaging, labeling and distribution, thereby fully integrating all components of the supply chain from starting materials to patient
experience. We announced the ground breaking of ASTRA in January 2020 and began operational production in the third quarter of 2023.

Our proprietary manufacturing process which was initially developed for B-VEC and is now being used across our platform, was developed and

optimized internally and involves both an upstream production process and downstream

14

purification  process.  Recombinant  viral  vectors  are  rendered  incapable  of,  or  attenuated  for,  replacing  in  human  cells  by  removal  of  specific  viral
machinery, including packaging proteins. However, to produce the recombinant virus, these viral proteins have to be re-introduced into the virus production
process  so  that  the  viral  vector  can  be  packaged.  In  most  other  viral  vector  production  systems,  the  missing  viral  proteins  are  supplied  in  one  or  more
individual helper plasmids, along with the base viral vector plasmid. All the plasmids are then co-transfected into a production cell line in the presence of a
transfection  agent  to  facilitate  viral  vector  production  and  packaging.  The  difficulty  of  this  approach  is  that  it  requires  c-scale  manufacturing  and
qualification of each of the packaging plasmids and optimization of the transfection method. Even with optimized reagents and methods, significant batch-
to-batch variability is seen in viral vector yield and titer that, we believe, drives up the cost of viral vector manufacturing and scale-up and increases the risk
of failure during manufacturing.

Our proprietary upstream process for HSV-1 production avoids the aforementioned issues. Our process requires three critical components:

•

•

Production of a master virus seed stock (“MVSS”);

Production of complementing master cell bank (“MCB”); and

• Optimized transduction parameters.

For VYJUVEK and each of our product candidates, we generate a MVSS which is scaled up from a single purified clone of the modified HSV-1
vector expressing the therapeutic effector. The MCB is a complementing cell line that stably expresses the HSV-1 viral proteins that are required for HSV-1
growth but have been deleted from the recombinant HSV-1 backbone. By introducing the deleted proteins into the MCB, as opposed to including them in
the viral replication process via co-transfection of individual plasmids, we eliminate the need for multiple qualifications of the plasmids or variability in
transfection efficiency from batch to batch, that other production processes face. Infection of the MCB with the MVSS at the optimal concentration results
in production of the viral particle. Once the MCB, the MVSS, and the conditions of infection are established, virus production and resultant yield and titer
are highly reproducible and scalable over multiple runs, and the risk of failure is minimal.

Optimization  of  MCB,  MVSS  and  production  methods  requires  extensive  knowledge  and  technical  experience  with  the  HSV-1  genome  and
significant upfront effort to design and select the best virus seed stock and complementing cell line. We have screened hundreds of cell line clones to find
the best complementing cell lines, and similarly designed and generated the optimal virus seed stocks for VYJUVEK and each of our product candidates.
The  viral  seed  stock  expresses  the  therapeutic  proteins  under  the  control  of  strong  constitutive  or  tissue-specific  promoters  and  additional  non-coding
regulatory  sequences  have  been  included  to  optimize  gene  expression.  We  also  have  optimized  the  transduction  conditions  to  reproducibly  obtain  high
yields of the virus.

Unlike the upstream process, steps used to purify and concentrate the viral vector product are often common across different viral vector platforms
and  usually  involve  multiple  stages  of  purification,  clarification,  concentration,  and  diafiltration,  with  the  ultimate  goal  to  remove  contaminants  and
concentrate the product. We have developed a robust and reproducible process for purifying our viral vector to required concentrations for commercial and
clinical use, while successfully removing contaminants to meet FDA guidelines.

We believe that the MVSS and MCB are a vital part of the production of VYJUVEK and our product candidates, as they ensure the reproducible

production of multiple commercial and clinical batches in a short six-week cycle time frame and in a cost-effective manner.

We have made significant investments in developing the most comprehensive and optimized manufacturing process for VYJUVEK and our vector

product candidates, including:

• A  proprietary  vector  manufacturing  technique  and  a  series  of  high-efficiency  purification  processes  that  produce  highly  purified  therapeutic

vectors and can be adapted for each product candidate; and

• A critical list of CGMP assays to accurately characterize our process and the HSV-1 vectors we produce.

Competition

The  biotechnology  and  pharmaceutical  industries  are  highly  competitive.  In  particular,  the  field  of  gene  therapy  is  characterized  by  rapidly
advancing technologies, intense competition and a strong emphasis on proprietary products. Some of our competitors have substantially greater financial
resources and larger research and development organizations. In addition, our experience in clinical trials, obtaining FDA and other regulatory approvals,
and manufacturing and commercialization of products may be more limited.

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VYJUVEK / B-VEC

Dystrophic Epidermolysis Bullosa

A number of companies are developing drug candidates for the treatment of DEB. VYJUVEK is the only corrective therapy for DEB approved

worldwide. We believe our competitors fall into two broad categories:

• Corrective Approaches: We are aware of two companies, Abeona Therapeutics Inc. and Castle Creek Biosciences, Inc., which are developing
autologous or grafting gene therapy approaches to treating DEB. We are also aware of a recombinant-protein based approach being developed by
BridgeBio Pharma, Inc.’s affiliate company, Phoenix Tissue Repair.

•

Palliative Treatments: We are aware of companies, such as Chiesi Farmaceutici S.p.A. and RHEACELL GmbH & Co., which are  developing
product  candidates  taking  a  palliative  approach  to  treating  the  disease.  Chiesi  Farmaceutici  S.p.A.’s  palliative  treatment  Filsuvez   (birch
triterpenes) was approved by the FDA in the United States in 2023 and was previously approved by the EMA for the EU.

®

Ophthalmology

Ocular Complications Secondary to Dystrophic Epidermolysis Bullosa

There are no approved therapies for ocular complications secondary to DEB at this time. We are aware of Eliksa Therapeutics’ program evaluating

amniotic fluid derived ELK-003 eye drops to treat corneal abrasions in individuals with epidermolysis bullosa.

Respiratory

Cystic Fibrosis

There are no approved therapies for CF patients ineligible or intolerant to modulator regiments. We are aware of several preclinical or early clinical
stage  nucleic-acid-based  programs  for  treatment  of  this  patient  population  including  Vertex  Pharmaceuticals  Inc.,  ReCode  Therapeutics,  Inc.,  Spirovant
Sciences, Inc., and 4D Molecular Therapeutics, Inc.

Alpha-1 Antitrypsin Deficiency

Currently approved treatments for AATD consist of IV administered alpha-1 antitrypsin augmentation therapy, administered weekly. We are aware
of at least three companies marketing augmentation therapies globally: CSL Limited, Takeda Pharmaceutical Company Limited., and Grifols, S.A. We are
also  aware  of  several  preclinical  or  clinical  stage  programs  in  development  for  the  treatment  of  various  clinical  manifestations  of  AATD.  These  can  be
generally classified into four broad categories:

• Gene  Silencing  Approaches:  We  are  aware  of  two  companies,  Takeda  Pharmaceutical  Company  Limited  (in  partnership  with  Arrowhead
Pharmaceutical  Inc.)  and  Novo  Nordisk  A/S  (in  partnership  with  Alnylam  Pharmaceuticals,  Inc.),  which  are  developing  interfering  RNA
medicines to treat the liver manifestations of AATD.

• Alternate  Augmentation  Approaches:  We  are  aware  of  companies,  such  as  Kamada  Ltd.  and  Sanofi  S.A.,  which  are  developing  new

augmentation treatments with modified frequency or routes of administration to treat the lung manifestations of AATD.

• Direct Protease Inhibition: We are aware of companies, such as Peak Bio, Inc. and Mereo BioPharma Group plc, which are developing protease

inhibitors to treat the lung manifestations of AATD.

• Gene Editing Approaches: We are aware of companies, such as Intellia Therapeutics, Inc., Wave Life Sciences Ltd., and Beam Therapeutics Inc.,

which are developing gene editing therapies inhibitors to treat both the lung and liver manifestations of AATD.

Oncology

Solid Tumors

A large number of companies are focused on the development and commercialization of new therapeutics for the treatment of locally advanced or
metastatic  tumors.  We  are  aware  of  multiple  programs  across  all  stages  of  development  as  well  as  marketed  products  aiming  to  improve  outcomes  for
patients with solid tumor malignancies. Some of the most established companies in the marketing and development of new cancer drugs include Merck &
Co Inc., Bristol Myers Squibb Company, Johnson & Johnson, and Pfizer Inc.

16

Dermatology

Autosomal Recessive Congenital Ichthyosis

There are no approved therapies for ARCI at this time. We are aware of LEO Pharma A/S’s clinical stage program evaluating topical isotretinoin

for ARCI.

Netherton Syndrome

There are no approved therapies for Netherton Syndrome. We are aware of Quoin Pharmaceutical Ltd.’s clinical stage program evaluating QRX003
for  the  treatment  of  Netherton  Syndrome  and  that  Novartis  Inc.  had  conducted  clinical  trials  of  a  product  for  the  treatment  of  Netherton  Syndrome
previously.

Aesthetics

Aesthetic Skin Conditions

There  are  multiple  approved  therapies  for  aesthetic  skin  conditions,  including  hyaluronic  acid  and  botulinum  toxin  based  products  marketed  by
AbbVie Inc., Revance Therapeutics, Inc., Merz Pharma GmbH & Co., KGaA, Galderma S.A., and others. We are also aware of multiple preclinical and
clinical stage programs for improvement in aesthetic skin conditions, including those underway at AbbVie Inc. and Galderma S.A.

Intellectual Property and Proprietary Rights

Our  success  depends  in  part  upon  our  ability  to  obtain  and  maintain  exclusivity  for  our  approved  product,  product  candidates  and  platform
technology. We typically rely on a combination of patent protection and regulatory exclusivity to maintain exclusivity for our approved product and product
candidates, whereas exclusivity for our platform technology is generally based on patent protection and trade secret protection. However, trade secrets can
be difficult to protect. In addition to patent protection, regulatory exclusivity, and trade secret protection, we also protect our approved product, product
candidates and platform technology with trademarks and contractual protections. Additionally, we seek to protect our proprietary technology and processes,
and  obtain  and  maintain  ownership  of  certain  technologies,  in  part,  through  confidentiality  agreements  and  intellectual  property  assignment  agreements
with our employees, consultants and commercial partners. We also seek to preserve the integrity and confidentiality of our data, trade secrets, and know-
how, including by implementing measures intended to maintain the physical and electronic security of our research and manufacturing facilities, as well as
our information technology systems.

We actively seek patent protection for our product candidates and certain of our proprietary technologies by filing patent applications in the U.S.
and  other  countries  as  appropriate.  These  patent  applications  are  directed  to  various  inventions.  We  do  not  have  patents  or  patent  applications  in  every
jurisdiction where there is a potential commercial market for our approved product or our product candidates. For each of our programs, our decision to
seek patent protection in specific foreign markets, in addition to the U.S., is based on many factors, including:

•

•

•

•

•

our available resources;

the number and types of patents already filed or pending;

the likelihood of success of the product candidate;

the size of the commercial market;

the presence of a potential competitor in the market; and

• whether the legal authorities in the market effectively enforce patent rights.

We  continually  evaluate  our  patent  portfolio  and  patent  strategy  and  believe  our  patents  and  patent  applications  provide  us  with  a  competitive
advantage;  however,  if  markets  where  we  do  not  have  patents  or  patent  applications  become  commercially  important,  our  business  may  be  adversely
affected.  A  discussion  of  certain  risks  and  uncertainties  that  may  affect  our  freedom  to  operate,  patent  position,  regulatory  exclusivities,  and  other
proprietary rights is set forth in Item 1A. Risk Factors included in this Annual Report on Form 10-K.

Certain  of  our  product  candidates  are  in  therapeutic  areas  that  have  been  the  subject  of  many  years  of  extensive  research  and  development  by
academic organizations and third parties who may control patents or other intellectual property that they might assert against us, should one or more of our
product  candidates  in  these  therapeutic  areas  succeed  in  obtaining  regulatory  approval  and  thereafter  be  commercialized.  We  continually  evaluate  the
intellectual property rights of others in these areas in order to determine whether a claim of infringement may be made by others against us. Should we
determine that a third party has intellectual property rights that could impact our ability to freely market a product candidate, we consider a number of
factors in determining how best to prepare for the commercialization of any such product candidate. In making this determination we consider, among other
things, the stage of development of our product candidate, the anticipated date of first

17

regulatory approval, whether we believe the intellectual property rights of others are valid, whether we believe we infringe the intellectual property rights
of others, whether a license is available upon commercially reasonable terms, whether we will seek to challenge the intellectual property rights of others,
the term of the rights, and the likelihood of and liability resulting from an adverse outcome should we be found to infringe the intellectual property rights of
others.

Currently, U.S. patents, as well as most foreign patents, are generally effective for 20 years from the date the earliest regular application was filed.
In some countries, the patent term may be extended to recapture a portion of the term lost during regulatory review of the product candidate. For example,
in the U.S., under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly known as the Hatch-Waxman Act, a patent that covers
an  FDA-approved  biologic  may  be  eligible  for  patent  term  extension  (for  up  to  5  years,  but  not  beyond  a  total  of  14  years  from  the  date  of  product
approval) as compensation for patent term lost during the FDA regulatory review process. The application for the extension must be submitted prior to the
expiration of the patent and only one patent may be extended for any product based on FDA review delay. The United States Patent and Trademark Office
(“USPTO”), in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In addition to patent term
extension under the Hatch-Waxman Act, patents in the U.S. may be granted additional term due to delays at the USPTO during prosecution of a patent
application. We actively strive to maximize the potential for patent protection for our product and product candidates in accordance with the law.

Patents

Our technology platform, VYJUVEK, and our product candidates are primarily protected by composition of matter and methods of use patents and
patent  applications.  A  summary  of  granted  composition  of  matter  and/or  methods  of  use  patents  that  we  own,  which  cover  our  technology  platform,
VYJUVEK, and our product candidates in the U.S. and elsewhere, is provided below.

Our Technology Platform

Patent Number

*
Country / Region

Patent Type

U.S. 10,441,614

United States

U.S. 11,185,564

United States

U.S. 11,865,148

United States

AU 2019280069

Australia

Composition of Matter & Methods of Use – Delivery
platform for targeted therapeutics, as well as methods of its
use for delivering any effector to the skin

Methods of Use – Methods of use of replication-defective
HSV vectors for delivering any effector to skin-targeted
therapeutics

Methods of Use – Methods of use of replication-defective
HSV-1 for delivering any effector to the eye

Composition of Matter & Methods of Use – Delivery
platform for targeted therapeutics, as well as methods of its
use for delivering any effector to the skin

VYJUVEK / B-VEC

Patent Number

*
Country / Region

Patent Type

U.S. 9,877,990

United States

U.S. 10,155,016

United States

EP 3,377,637

Europe

Composition of Matter & Methods of Use – Compositions
comprising HSV vectors encoding certain effectors, including
the effector encoded in B-VEC, and methods of using the
same for providing prophylactic, palliative or therapeutic
relief of a wound, disorder or disease of the skin

Composition of Matter – Covers compositions containing B-
VEC, formulated for alternate routes of administration

Composition of Matter – Pharmaceutical compositions
comprising B-VEC, as well as uses thereof, including for
providing prophylactic, palliative or therapeutic relief of a
wound, disorder or disease of the skin

Expiration Date
**

12/28/2036

Owner

Krystal

12/28/2036

Krystal

12/28/2036

12/28/2036

Krystal

Krystal

Expiration Date
**

12/28/2036

Owner

Krystal

12/28/2036

12/28/2036

Krystal

Krystal

18

JP 6,970,086

Japan

AU 2016401692

Australia

MX 394867

Mexico

Composition of Matter & Uses Thereof – Pharmaceutical
compositions comprising B-VEC, as well as uses thereof,
including for providing prophylactic, palliative or therapeutic
relief of a wound, disorder or disease of the skin

Composition of Matter & Uses Thereof – Pharmaceutical
compositions comprising B-VEC, as well as uses thereof,
including for providing prophylactic, palliative or therapeutic
relief of a wound, disorder or disease of the skin

Composition of Matter & Uses Thereof – Pharmaceutical
compositions comprising B-VEC, as well as uses thereof,
including for providing prophylactic, palliative or therapeutic
relief of a wound, disorder or disease of the skin

12/28/2036

Krystal

12/28/2036

Krystal

12/28/2036

Krystal

Respiratory

KB407

Patent Number

*
Country / Region

Patent Type

U.S. 10,829,529

United States

ZA 2022/05420

South Africa

Methods of Use – Methods of using KB407 for the treatment
of cystic fibrosis and other disease causing progressive lung
destruction

Methods of Use – Methods of using KB407 for the treatment
of cystic fibrosis and other disease causing progressive lung
destruction

Expiration Date
**

2/7/2040

Owner

Krystal

2/7/2040

Krystal

Oncology

KB707

Patent Number

*
Country / Region

Patent Type

U.S. 11,779,660

United States

Composition of Matter – Pharmaceutical compositions
comprising HSV vectors encoding IL-2 and IL-12

Expiration Date
**

4/14/2042

Owner

Krystal

Dermatology

KB105

Patent Number

*
Country / Region

Patent Type

U.S. 10,525,090

United States

U.S. 11,717,547

United States

AU 2019252658

Australia

Composition of Matter & Methods of Use – Pharmaceutical
compositions comprising herpes virus vectors encoding
TGM1, as well as methods of providing prophylactic,
palliative, or therapeutic relief to TGM1-deficient ARCI
subjects

Composition of Matter & Methods of Use – Pharmaceutical
compositions comprising replication-defective HSV-1 vectors
encoding TGM, as well as methods of delivering TGM to
cells

Composition of Matter & Methods of Use – Pharmaceutical
compositions comprising herpes virus vectors encoding
TGM1, as well as methods of providing prophylactic,
palliative, or therapeutic relief to TGM1-deficient ARCI
subjects

Expiration Date
**

4/11/2039

Owner

Krystal

4/11/2039

Krystal

4/11/2039

Krystal

19

KB104

Patent Number

*
Country / Region

Patent Type

U.S. 11,642,384

United States

Composition of Matter – Pharmaceutical compositions
comprising eplication-defective HSV vectors encoding
SPINK5

Expiration Date
**

9/24/2039

Owner

Krystal

Aesthetics

KB301

Patent Number

*
Country / Region

Patent Type

U.S. 10,786,438

United States

AU 2019260757

Australia

Composition of Matter & Methods of Use – Pharmaceutical
compositions comprising HSV vectors encoding one or more
cosmetic proteins, as well as methods of their use for
improving skin condition, quality, and/or appearance

Composition of Matter & Methods of Use – Pharmaceutical
compositions comprising HSV vectors encoding one or more
cosmetic proteins, as well as methods of their use for
improving skin condition, quality, and/or appearance

Expiration Date
**

4/26/2039

Owner

Krystal

4/26/2039

Krystal

*    Granted patents in the U.S. and elsewhere are shown. Additional patent protection in the U.S., Europe or other countries or regions through pending or

granted counterparts may be available.

**    Stated expiration dates do not account for any patent term extension, supplemental protection certificate, or pediatric extensions that may be available.

Regulatory Exclusivity

The  various  types  of  regulatory  exclusivity  or  designations  for  which  VYJUVEK  and  our  product  candidates  have  been  granted,  or  which  our
current  or  future  product  candidates  may  be  eligible  to  receive  are  generally  discussed  above  or  below,  under  “Government  Regulation  and  Product
Approval”.

Trademarks

Our trademarks are important to us and are generally filed to protect our corporate brand, our approved product, our product candidates, and our
platform technology. We typically file trademark applications and pursue their registration in the U.S., Europe and other markets in which we anticipate
using such trademarks. We are the owner of several federal trademark registrations in the U.S. and have pending trademark applications and registrations in
the U.S. and in major foreign markets. Trademark protection varies in accordance with local law and continues in some countries as long as the trademark
is used and in other countries as long as the trademark is registered. Trademark registrations generally are for fixed but renewable terms.

Government Regulation and Product Approval

In  the  United  States,  the  FDA  regulates  biologic  products  including  gene  therapy  products  under  the  Federal  Food,  Drug,  and  Cosmetic  Act
(“FDCA”), the Public Health Service Act (“PHSA”), and regulations and guidance implementing these laws. The FDCA, PHSA and their corresponding
regulations govern, among other things, the testing, manufacturing, safety, efficacy, labeling, packaging, storage, record keeping, distribution, reporting,
importation, advertising and other promotional practices involving biologic products. IND applications to the FDA are required before conducting human
clinical testing of biologic products. Additionally, each clinical trial protocol for a gene therapy product candidate is reviewed by the FDA, and in limited
instances the National Institutes of Health (“NIH”), through its Recombinant DNA Advisory Committee, or RAC. The FDA’s authorization also must be
obtained before marketing of biologic products. The process of obtaining regulatory approvals or licenses and the subsequent compliance with appropriate
federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources, and we may not be able to obtain
the required regulatory approvals to successfully develop and commercialize our product candidates.

Within the FDA, the Center for Biologics Evaluation and Research (“CBER”) regulates gene therapy products. Within CBER, the review of gene
therapy  and  related  products  is  in  the  Office  of  Therapeutic  Products  (“OTP”)  and  the  FDA  has  established  the  Cellular,  Tissue  and  Gene  Therapies
Advisory Committee to advise CBER on its reviews. CBER works closely with the NIH and the RAC, which makes recommendations to the NIH on gene
therapy issues and engages in a public discussion of scientific, safety, ethical and societal issues related to proposed and ongoing gene therapy protocols.
The FDA has provided guidance for the development of gene therapy products generally, including a growing body of guidance documents

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on CMC, clinical investigations, and other areas of gene therapy development, all of which are intended to facilitate the industry’s development of gene
therapy products.

Ethical,  social  and  legal  concerns  about  gene  therapy,  genetic  testing  and  genetic  research  could  result  in  additional  regulations  restricting  or
prohibiting the processes we may use. Federal and state agencies, congressional committees and foreign governments have expressed interest in further
regulating biotechnology. More restrictive regulations or claims that our products are unsafe or pose a hazard could prevent us from commercializing any
products. New government requirements may be established that could delay or prevent regulatory approval of our product candidates under development.
It is impossible to predict whether legislative changes will be enacted, regulations, policies or guidance changed, or interpretations by agencies or courts
changed, or what the impact of such changes, if any, may be.

U.S. Biologic Products Development Process

The  FDA  must  authorize  the  marketing  of  a  product  candidate  for  marketing  in  the  United  States.  The  process  required  by  the  FDA  before  a

biologic product candidate may be marketed in the United States generally involves the following:

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•

•

•

completion of preclinical laboratory tests and in vivo studies in accordance with the FDA’s Current Good Laboratory Practice (“CGLP”),
regulations and applicable requirements for the humane use of laboratory animals or other applicable regulations;

submission to the FDA of an IND application, which allows human clinical trials to begin unless FDA objects within 30 days;

approval by each clinical trial site’s Institutional Review Board (“IRB”) and, if applicable, Institutional Biosafety Committee (“IBC”), before
the clinical trial may be initiated;

performance  of  adequate  and  well-controlled  human  clinical  trials  according  to  the  FDA’s  Current  Good  Clinical  Practice  (“CGCP”)
regulations and any additional requirements for the protection of human research subjects and their health information, to establish the safety
and efficacy of the proposed biologic product candidate for its intended use;

preparation  and  submission  to  the  FDA  of  an  application  for  marketing  approval  that  includes  substantial  evidence  of  safety,  purity  and
potency from results of nonclinical testing and clinical trials;

review of the product by an FDA advisory committee, if applicable;

satisfactory completion of an FDA inspection of the manufacturing facility or facilities where the biologic product candidate is produced to
assess compliance with Current Good Manufacturing Practice (“CGMP”) requirements and to assure that the facilities, methods and controls
are adequate to preserve the biologic product candidate’s identity, safety, strength, quality, potency and purity;

potential FDA audit of the nonclinical and clinical trial sites that generated the data in support of the application; and

payment of user fees and FDA review and marketing authorization.

Before testing any new biologic product candidate in humans, including a gene therapy product candidate, the product candidate must undergo
preclinical testing. Preclinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as in vivo studies to assess the
potential safety and activity of the product candidate and to establish a rationale for therapeutic use. The conduct of the preclinical tests must comply with
federal regulations and requirements including CGLPs.

Concurrent  with  clinical  trials,  companies  usually  must  complete  some  long-term  preclinical  testing,  such  as  animal  studies  of  reproductive
adverse events and carcinogenicity and must also develop additional information about the chemistry and physical characteristics of the biological product
and  finalize  a  process  for  manufacturing  the  biological  product  in  commercial  quantities  in  accordance  with  CGMP  requirements.  The  manufacturing
process  must  be  capable  of  consistently  producing  quality  batches  of  the  biological  product  candidate  and,  among  other  things,  the  manufacturer  must
develop methods for testing the identity, strength, quality and purity of the final biological product. Additionally, appropriate packaging must be selected
and tested, and stability studies must be conducted, to demonstrate that the biological product candidate does not undergo unacceptable deterioration over
its shelf life.

The clinical trial sponsor must submit the results of the preclinical tests, together with manufacturing information, analytical data, any available
clinical data or literature and a proposed clinical protocol, to the FDA as part of an IND application. Some preclinical testing may continue even after the
IND application is submitted. With gene therapy protocols, if

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the  FDA  allows  the  IND  application  to  proceed,  but  the  RAC  decides  that  full  public  review  of  the  protocol  is  warranted,  the  FDA  will  request  at  the
completion of its IND application review that sponsors delay initiation of the protocol until after completion of the RAC review process. The FDA also
may impose clinical holds on a biologic product candidate at any time before or during clinical trials due to safety concerns or non-compliance. If the FDA
imposes a clinical hold, trials may not recommence without FDA authorization and then only under terms authorized by the FDA. Accordingly, we cannot
be sure that submission of an IND application for our product candidates will result in the FDA allowing clinical studies to begin, or that, once begun,
issues will not arise that suspend or terminate such studies.

Human Clinical Trials Under an IND

Clinical  trials  involve  the  administration  of  the  biologic  product  candidate  to  healthy  volunteers  or  patients  under  the  supervision  of  qualified
investigators  who  generally  are  physicians  not  employed  by  or  under  the  control  of  the  trial  sponsor.  Clinical  trials  are  conducted  under  written  study
protocols detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria and the parameters to
be used to monitor subject safety, including stopping rules that assure a clinical trial will be stopped if certain adverse events should occur. Each protocol
and any amendments to the protocol must be submitted to the FDA as part of the IND application. An IND application becomes effective 30 days after
receipt by the FDA, unless before that time the FDA raises concerns or questions related to a proposed clinical trial and places the trial on clinical hold,
including concerns that human research subjects will be exposed to unreasonable health risks. In such a case, the IND sponsor and the FDA must resolve
any outstanding concerns before the clinical trial can begin. Accordingly, submission of an IND application may or may not result in the FDA allowing
clinical trials to commence.

Clinical  trials  must  be  conducted  and  monitored  in  accordance  with  the  FDA’s  regulations  comprising  CGCP  requirements,  including  the
requirement that all research subjects provide informed consent. Further, each clinical trial must be reviewed and approved by an IRB and, if applicable,
IBC  at  or  servicing  each  institution  at  which  the  clinical  trial  will  be  conducted.  An  IRB  is  charged  with  protecting  the  welfare  and  rights  of  trial
participants and considers items such as whether the risks to individuals participating in the clinical trials are minimized and are reasonable in relation to
anticipated benefits. The IRB also approves the form and content of the informed consent that must be signed by each clinical trial subject, or their legal
representative, reviews and approves the study protocol, and must monitor the clinical trial until completed. Clinical trials involving recombinant DNA at
certain  institutions  also  must  be  reviewed  by  an  IBC,  a  local  institutional  committee  that  reviews  and  oversees  basic  and  clinical  research  that  utilizes
recombinant DNA at that institution. The IBC assesses the safety of the research and identifies any potential risk to public health or the environment.

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

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Phase 1. The biologic product candidate initially is introduced into a small number of healthy human subjects and tested for safety, dosage
tolerance, absorption, metabolism, distribution and excretion and, if possible, to gain an early understanding of its effectiveness. In the case
of  some  product  candidates  for  severe  or  life-threatening  diseases,  especially  when  the  product  candidate  may  be  too  inherently  toxic  to
ethically administer to healthy volunteers, the initial human testing is often conducted in patients. Phase 1 clinical trials of gene therapies are
typically conducted in patients rather than healthy volunteers.

Phase 2. The biologic product candidate is evaluated in a limited patient population to identify possible adverse effects and safety risks, to
preliminarily evaluate the efficacy of the product candidate for specific targeted diseases and to determine dosage tolerance, optimal dosage
and dosing schedule.

Phase 3. Phase 3 clinical trials are commonly referred to as “pivotal” studies, which typically denotes studies that present the data the FDA
or other relevant regulatory agencies will use to determine whether or not to approve a biologic product. In Phase 3 studies, the biologic
product  candidate  is  administered  to  an  expanded  patient  population,  generally  at  multiple  geographically  dispersed  clinical  trial  sites  in
adequate  and  well-controlled  clinical  trials  to  generate  sufficient  data  to  statistically  confirm  the  potency  and  safety  of  the  product  for
approval. These clinical trials are intended to establish the overall risk/benefit ratio of the product candidate and provide an adequate basis
for product labeling.

Post-approval clinical trials, sometimes referred to as Phase 4 clinical trials, may be conducted after marketing approval. These clinical trials
are used to gain additional experience from the treatment of patients in the intended therapeutic indication, particularly for long-term safety
follow-up.

During all phases of clinical development, regulatory agencies require extensive monitoring and auditing of all clinical activities, clinical data and

clinical trial investigators. Annual progress reports detailing the results of the clinical trials must be submitted to the FDA.

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Additional Regulation for Gene Therapy Clinical Trials

In addition to the regulations discussed above, there are a number of additional standards that apply to clinical trials involving the use of gene
therapy. The FDA has issued various guidance documents regarding gene therapies, which outline additional factors the FDA will consider at each of the
above stages of development and relate to, among other things: the proper preclinical assessment of gene therapies; the CMC information that should be
included in an IND application; the proper design of tests to measure product potency in support of an IND or BLA application; and measures to observe
delayed adverse effects in subjects who have been exposed to investigational gene therapies when the risk of such effects is high. Further, the FDA usually
recommends that sponsors observe subjects for potential gene therapy-related delayed adverse events for a 15-year period, including a minimum of five
years of annual examinations followed by 10 years of annual queries, either in person or by questionnaire. The NIH and the FDA have a publicly accessible
database, the Genetic Modification Clinical Research Information System, which includes information on gene therapy trials and serves as an electronic
tool to facilitate the reporting and analysis of adverse events on these trials.

U.S. Review and Approval Processes

The  results  of  the  preclinical  tests  and  clinical  trials,  together  with  detailed  information  relating  to  the  product’s  CMC  and  proposed  labeling,
among other things, are submitted to the FDA as part of a Biologics License Application (“BLA”) or other submission requesting authorization to market
the product for one or more indications. For gene therapies, selecting patients with applicable genetic defects is a necessary condition to effective treatment.
Under  the  Prescription  Drug  User  Fee  Act  (“PDUFA”),  each  BLA  (or  New  Drug  Application  (“NDA”)  for  some  biologics)  must  be  accompanied  by  a
significant user fee. The FDA adjusts the PDUFA user fees on an annual basis. The PDUFA also imposes an annual product fee for biologics and an annual
establishment  license  fee  on  facilities  used  to  manufacture  prescription  biologics.  Fee  waivers  or  reductions  are  available  in  certain  circumstances,
including a waiver of the application fee for the first application filed by a small business. Additionally, no user fees are assessed on BLAs or NDAs for
product candidates designated as orphan drugs, unless the product candidate also includes a non-orphan indication.

The FDA reviews a BLA within 60 days of submission to determine if it is substantially complete before it accepts it for filing. The FDA may
refuse to file any BLA that it deems incomplete or not properly reviewable at the time of submission and may request additional information. In that event,
the BLA must be resubmitted with the additional information. The resubmitted application also is subject to review before the FDA accepts it for filing.
Once the submission is accepted for filing, the FDA begins an in-depth, substantive review of the BLA. The FDA reviews the BLA to determine, among
other things, whether the proposed product candidate is safe and potent, or effective, for its intended use, has an acceptable purity profile and whether the
product  candidate  is  being  manufactured  in  accordance  with  CGMP  to  assure  and  preserve  the  product  candidate’s  identity,  safety,  strength,  quality,
potency and purity. The FDA may refer applications for novel biologic products or biologic products that present difficult questions of safety or efficacy to
an  advisory  committee,  typically  a  panel  that  includes  clinicians  and  other  experts,  for  review,  evaluation  and  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.  During  the  product  approval  process,  the  FDA  also  will  determine  whether  a  Risk  Evaluation  and
Mitigation Strategy (“REMS”) program is necessary to assure the safe use of the product candidate.

REMS use risk minimization strategies beyond the professional labeling to ensure that the benefits of the product outweigh the potential risks. To
determine  whether  a  REMS  is  needed,  the  FDA  will  consider  the  size  of  the  population  likely  to  use  the  product,  seriousness  of  the  disease,  expected
benefit of the product, expected duration of treatment, seriousness of known or potential adverse events, and whether the product is a new molecular entity.
A REMS could include medication guides, physician communication plans and elements to assure safe use, such as restricted distribution methods, patient
registries and other risk minimization tools. If the FDA concludes a REMS is needed, the sponsor of the BLA must submit a proposed REMS; the FDA
will not approve the BLA without a REMS, if required.

Before  approving  a  BLA,  the  FDA  will  inspect  the  facilities  at  which  the  product  candidate  is  manufactured.  The  FDA  will  not  approve  the
product candidate unless it determines that the manufacturing processes and facilities are in compliance with CGMP requirements and adequate to assure
consistent production of the product candidate within required specifications. Additionally, before approving a BLA, the FDA typically will inspect one or
more clinical sites to assure that the clinical trials were conducted in compliance with the IND application trial requirements and CGCP requirements.

On the basis of the BLA and accompanying information, including the results of the inspection of the manufacturing facilities, the FDA may issue
an  approval  letter  or  a  complete  response  letter.  An  approval  letter  or  license  authorizes  commercial  marketing  of  the  biologic  product  with  specific
prescribing  information  for  specific  indications.  A  complete  response  letter  generally  outlines  the  deficiencies  in  the  submission  and  may  require
substantial additional testing or information in order for the FDA to reconsider the application. If and when those deficiencies have been addressed to the
FDA’s satisfaction in a resubmission of the BLA, the FDA will issue an approval letter.

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If a product candidate receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications
for use may otherwise be limited. Further, the FDA may require that certain contraindications, warnings or precautions be included in the product labeling.
The FDA may impose restrictions and conditions on product distribution, prescribing or dispensing in the form of a REMS, or otherwise limit the scope of
any approval. In addition, the FDA may require post-marketing clinical trials, sometimes referred to as Phase 4 clinical trials, designed to further assess a
biologic  product’s  safety  and  effectiveness,  and  testing  and  surveillance  programs  to  monitor  the  safety  of  approved  products  that  have  been
commercialized.

The FDA has agreed to specified performance goals in the review of BLAs under the PDUFA. One such goal is to review standard BLAs in 10
months after the FDA accepts the BLA for filing, and priority BLAs in six months, whereupon a review decision is to be made. The FDA does not always
meet  its  PDUFA  goal  dates  for  standard  and  priority  BLAs  and  its  review  goals  are  subject  to  change  from  time  to  time.  The  review  process  and  the
PDUFA goal date may be extended by three months if the FDA requests or the BLA sponsor otherwise provides additional information or clarification
regarding information already provided in the submission within the last three months before the PDUFA goal date.

Fast Track Designation

Fast Track designation is granted to drugs being developed for the treatment of serious or life-threatening diseases or conditions where there is an
unmet medical need. The purpose of the Fast Track designation provision is to help facilitate development and expedite the review and potential approval
of  drugs  to  treat  serious  and  life-threatening  conditions.  Sponsors  of  drugs  that  receive  Fast  Track  designation  have  the  opportunity  for  more  frequent
interactions with the FDA review team throughout the development program. These can include meetings to discuss study design, data required to support
approval, or other aspects of the clinical program. Additionally, products that have been granted Fast Track designation may be eligible for priority review
of a BLA application and the FDA may consider reviewing portions of the submission before the sponsor submits the complete application, also known as
a rolling review.

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may designate a biologic product as an “orphan drug” if it is intended to treat a rare disease or condition,
generally meaning that it affects fewer than 200,000 individuals in the United States, or more in cases in which there is no reasonable expectation that the
cost of developing and making a biologic product available in the United States for treatment of the disease or condition will be recovered from sales of the
product.

If  a  product  with  orphan  status  receives  the  first  FDA  approval  for  the  disease  or  condition  for  which  it  has  such  designation,  the  product  is
entitled to orphan product exclusivity, meaning that the FDA may not approve any other applications to market the same drug or biologic product for the
same indication for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with orphan exclusivity or if the
party holding the exclusivity fails to assure the availability of sufficient quantities of the drug to meet the needs of patients with the disease or condition for
which the drug was designated. Competitors, however, may receive approval of different products for the same indication for which the orphan product has
exclusivity  or  obtain  approval  for  the  same  product  but  for  a  different  indication  for  which  the  orphan  product  has  exclusivity.  Other  benefits  include
reduced regulatory fees, protocol assistance and tax credits for certain clinical research costs.

Orphan medicinal product status in the European Union (“EU”) and Japan have similar, but not identical benefits.

Breakthrough Therapy

A breakthrough therapy is defined as a therapy that is intended, alone or in combination with one or more other therapies, to treat a serious or life-
threatening  disease  or  condition,  and  preliminary  clinical  evidence  indicates  that  the  therapy  may  demonstrate  substantial  improvement  over  existing
therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development. For therapies that
have been designated as breakthrough therapies, interaction and communication between the FDA and the sponsor of the trial can help to identify the most
efficient  path  for  clinical  development  while  minimizing  the  number  of  patients  placed  in  ineffective  control  regimens.  Therapies  designated  as
breakthrough therapies by the FDA may also be eligible for priority review and accelerated approval.

Regenerative Medicine Advanced Therapy (“RMAT”) Designation

Established under the 21st Century Cures Act, RMAT designation is a program designed to expedite the development and approval of regenerative
medicine  products,  including  gene  therapy  products.  An  investigational  therapy  is  eligible  for  the  RMAT  designation  if  it  is  intended  to  treat,  modify,
reverse or cure a serious or life-threatening disease or condition, and preliminary clinical evidence indicates a potential to address unmet medical needs for
that disease or condition. The designation includes all the benefits of the FDA’s Fast Track and Breakthrough Therapy designations and enables the ability
to  work  more  closely  and  frequently  with  the  FDA  to  discuss  surrogate  or  intermediate  endpoints  to  support  the  potential  acceleration  of  approval  and
satisfy post-approval requirements.

Prime Designation

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The  PRIority  MEdicines  (“PRIME”)  designation  is  awarded  by  the  EMA  to  promising  medicines  that  target  an  unmet  medical  need.  These
medicines are considered priority medicines by the EMA. To be eligible and accepted for PRIME, a medicine has to show its potential to benefit patients
with  unmet  medical  needs  based  on  early  clinical  data  coupled  with  non-clinical  data.  Through  PRIME,  the  EMA  offers  enhanced  support  to  medicine
developers  including  early  interaction  and  dialogue,  and  a  pathway  for  accelerated  evaluation  by  the  agency.  The  program  is  intended  to  optimize
development plans and expedite the review and approval process so that these medicines may reach patients as early as possible.

Rare Pediatric Disease Priority Review Voucher

The FDA also offers a rare pediatric disease drug designation. If a drug receives the designation of a “rare pediatric disease” drug, it is eligible
during the FDA marketing process to apply for a Rare Pediatric Disease Priority Review Voucher. According to the FDA website, under the Rare Pediatric
Priority Review Voucher Program, a sponsor who receives an approval for a drug or biologic for a “rare pediatric disease” may qualify for a voucher that
can be redeemed to receive a priority review of a subsequent marketing application for a different product.

Post-Approval Requirements

Rigorous  and  extensive  FDA  regulation  of  biologic  products  continues  after  approval,  particularly  with  respect  to  CGMP  requirements.
Manufacturers  are  required  to  comply  with  applicable  requirements  in  the  CGMP  regulations,  including  quality  control  and  quality  assurance  and
maintenance of records and documentation. Other post-approval requirements applicable to biologic products include reporting of CGMP deviations that
may  affect  the  identity,  potency,  purity  and  overall  safety  of  a  distributed  product;  recordkeeping  requirements;  reporting  of  adverse  effects;  reporting
updated safety and efficacy information; and complying with electronic record and signature requirements. After a BLA is approved, the product also may
be subject to official lot release. If the product is subject to official release by the FDA, the manufacturer submits samples of each lot of product to the
FDA, together with a release protocol, showing a summary of the history of manufacture of the lot and the results of all tests performed on the lot. The
FDA  also  may  perform  certain  confirmatory  tests  on  lots  of  some  products  before  releasing  the  lots  for  distribution.  In  addition,  the  FDA  conducts
laboratory research related to the regulatory standards on the safety, purity, potency and effectiveness of biologic products. A sponsor also must comply
with  the  FDA’s  advertising  and  promotion  requirements,  such  as  the  prohibition  on  promoting  products  for  uses  or  in  patient  populations  that  are  not
described in the product’s approved labeling (known as “off-label promotion”).

Discovery of previously unknown problems or the failure to comply with the applicable regulatory requirements may result in restrictions on the
marketing  of  a  product  or  withdrawal  of  the  product  from  the  market  as  well  as  possible  civil  or  criminal  sanctions.  In  addition,  changes  to  the
manufacturing process or facility generally require prior FDA approval before being implemented and other types of changes to the approved product, such
as adding new indications and additional labeling claims, are also subject to further FDA review and approval.

Government Regulation Outside of the United States

In addition to regulations in the United States, sponsors are subject to a variety of regulations in other jurisdictions governing, among other things,
clinical  trials  and  any  commercial  sales  and  distribution  of  biologic  products.  Because  biologically  sourced  raw  materials  are  subject  to  unique
contamination risks, their use may be restricted in some countries.

Whether or not a sponsor obtains FDA approval for a product, a sponsor must obtain the requisite approvals from regulatory authorities in foreign
countries prior to the commencement of clinical trials or marketing of the product in those countries. Certain countries outside of the United States have a
similar process that requires the submission of a clinical trial application, much like the IND application, prior to the commencement of human clinical
trials.  In  the  EU,  for  example,  a  request  for  a  Clinical  Trial  Authorization  (“CTA”)  must  be  submitted  to  the  competent  regulatory  authorities  and  the
competent Ethics Committees in the EU Member States in which the clinical trial takes place, much like FDA and the IRB, respectively. Once the CTA
request is approved in accordance with the EU and the EU Member State’s requirements, clinical trial development may proceed. The requirements and
processes governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, the clinical trials
are conducted in accordance with CGCPs and the applicable regulatory requirements of the country or countries in which the clinical trial is performed, as
well as the ethical principles that have their origin in the Declaration of Helsinki (whichever provides the greater protection to the clinical trial participants).

Failure to comply with applicable foreign regulatory requirements may result in, among other things, fines; suspension, variation or withdrawal of

regulatory approvals; product recalls; seizure of products; operating restrictions; and criminal prosecution.

Other Healthcare Laws and Regulations

Healthcare providers, physicians and third-party payors play a primary role in the recommendation and use of pharmaceutical products that are

granted marketing approval. Arrangements with third-party payors, existing or potential

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customers and referral sources are subject to broadly applicable fraud and abuse and other healthcare laws and regulations, and these laws and regulations
may constrain the business or financial arrangements and relationships through which manufacturers market, sell and distribute the products for which they
obtain marketing approval. Such restrictions under applicable federal and state healthcare laws and regulations include the following:

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•

the  federal  Anti-Kickback  Statute,  which  prohibits,  among  other  things,  persons  and  entities  from  knowingly  and  willfully  soliciting,
receiving,  offering  or  paying  remuneration,  directly  or  indirectly,  in  cash  or  kind,  in  exchange  for,  or  to  induce,  either  the  referral  of  an
individual for, or the purchase, order or recommendation of, any good or service for which payment may be made under federal healthcare
programs such as the Medicare and Medicaid programs. This statute has been interpreted to apply to arrangements between pharmaceutical
manufacturers,  on  the  one  hand,  and  prescribers,  purchasers  and  formulary  managers  on  the  other.  The  Patient  Protection  and  Affordable
Care Act (“ACA”) amended the intent requirement of the federal Anti-Kickback Statute. A person or entity no longer needs to have actual
knowledge of this statute or specific intent to violate it in order to commit a violation;

the federal false claims and civil monetary penalties laws, including the civil False Claims Act (“FCA”), which prohibit, among other things,
individuals or entities from knowingly presenting, or causing to be presented, claims for payment from Medicare, Medicaid or other third-
party payors that are false or fraudulent, or making a false statement to avoid, decrease, or conceal an obligation to pay money to the federal
government. Certain marketing practices, including off-label promotion, also may implicate the FCA. In addition, the ACA codified case law
that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim
for purposes of the FCA;

the  federal  Physician  Payments  Sunshine  Act,  which  requires  certain  manufacturers  of  drugs,  devices,  biologics  and  medical  supplies  for
which  payment  is  available  under  Medicare,  Medicaid,  or  the  Children’s  Health  Insurance  Program,  with  specific  exceptions,  to  report
annually to the Centers for Medicare & Medicaid Services information related to payments and other transfers of value to physicians, certain
other healthcare providers and teaching hospitals, and ownership and investment interests held by physicians and other healthcare providers
and their immediate family members;

the federal Health Care Fraud statute imposes criminal and civil liability for executing a scheme to defraud any healthcare benefit program or
making false statements relating to healthcare matters;

the  Health  Insurance  Portability  and  Accountability  Act  of  1996,  as  amended  by  the  Health  Information  Technology  for  Economic  and
Clinical Health Act, and its implementing regulations, which imposes obligations, including mandatory contractual terms, with respect to
safeguarding the transmission, security and privacy of protected health information;

the  federal  false  statements  statute  prohibits  knowingly  and  willfully  falsifying,  concealing  or  covering  up  a  material  fact  or  making  any
materially false statement in connection with the delivery of or payment for federally sponsored healthcare benefits, items or services; and

state and foreign law equivalents of each of the above federal laws, such as anti-kickback and false claims laws which may apply to items or
services reimbursed by any third-party payor, including commercial 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  federal
government  or  otherwise  restrict  payments  that  may  be  made  to  healthcare  providers  and  other  potential  referral  sources;  state  laws  that
require  drug  manufacturers  to  report  information  related  to  payments  and  other  transfers  of  value  to  physicians  and  other  healthcare
providers or marketing expenditures; and state laws governing the privacy and security of health information in certain circumstances, many
of which differ from each other in significant ways and may not have the same effect, thus complicating compliance efforts.

Violation  of  the  laws  described  above  or  any  other  governmental  laws  and  regulations  may  result  in  penalties,  including  civil  and  criminal
penalties,  damages,  fines,  the  curtailment  or  restructuring  of  operations,  the  exclusion  from  participation  in  federal  and  state  healthcare  programs,
disgorgement,  contractual  damages,  reputational  harm,  diminished  profits  and  future  earnings,  and  imprisonment.  Furthermore,  efforts  to  ensure  that
business activities and business arrangements comply with applicable healthcare laws and regulations can be costly.

Coverage and Reimbursement

Significant uncertainty exists as to the coverage and reimbursement status of any products for which we may obtain regulatory approval. In the
United  States,  sales  of  any  product  candidates  for  which  regulatory  approval  for  commercial  sale  is  obtained  will  depend  in  part  on  the  availability  of
coverage and adequate reimbursement from third-party payors. Third-party payors include government authorities and health programs in the United States
such as Medicare and Medicaid, managed care

26

providers,  private  health  insurers  and  other  organizations.  These  third-party  payors  are  increasingly  reducing  reimbursements  for  medical  products  and
services.  We  may  need  to  conduct  expensive  pharmacoeconomic  studies  in  order  to  demonstrate  the  medical  necessity  and  cost-effectiveness  of  our
products, in addition to incurring the costs required to obtain FDA approvals. The process for determining whether a payor will provide coverage for a drug
product may be separate from the process for setting the reimbursement rate that the payor will pay for the drug product. Third-party payors may limit
coverage  to  specific  drug  products  on  an  approved  list,  or  formulary,  which  might  not  include  all  FDA-approved  drugs  for  a  particular  indication.
Additionally, the containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs have been a focus in this
effort.  The  U.S.  government,  state  legislatures  and  foreign  governments  have  shown  significant  interest  in  implementing  cost-containment  programs,
including  price  controls,  restrictions  on  reimbursement  and  requirements  for  substitution  of  generic  products.  Coverage  policies  and  third-party
reimbursement  rates  may  change  at  any  time.  Even  if  favorable  coverage  and  reimbursement  status  is  attained  for  one  or  more  products  for  which  we
receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

In the EU, pricing and reimbursement schemes vary widely from country to country. Some countries provide that products may be marketed only
after  a  reimbursement  price  has  been  agreed.  Some  countries  may  require  the  completion  of  additional  studies  that  compare  the  cost-effectiveness  of  a
particular product candidate to currently available therapies. EU member states may approve a specific price for a product or it may instead adopt a system
of direct or indirect controls on the profitability of the company placing the product on the market. Other member states allow companies to fix their own
prices for products, but monitor and control company profits. The downward pressure on health care costs has become intense. As a result, increasingly
high barriers are being erected to the entry of new products. In addition, in some countries, cross-border imports from low-priced markets exert competitive
pressure  that  may  reduce  pricing  within  a  country.  Any  country  that  has  price  controls  or  reimbursement  limitations  may  not  allow  favorable
reimbursement and pricing arrangements.

Health Reform

The United States and some foreign jurisdictions are considering or have enacted a number of reform proposals to change the healthcare system.
There  is  significant  interest  in  promoting  changes  in  healthcare  systems  with  the  stated  goals  of  containing  healthcare  costs,  improving  quality  or
expanding  access.  In  the  United  States,  for  example,  the  pharmaceutical  industry  has  been  a  particular  focus  of  these  efforts  and  has  been  significantly
affected and continues to face major uncertainty due to the status of major legislative initiatives surrounding healthcare reform. On August 16, 2022, the
Inflation  Reduction  Act  of  2022  (“IRA”)  was  signed  into  law.  The  IRA  includes  several  provisions  to  lower  prescription  drug  costs  for  people  with
Medicare and reduce drug spending by the federal government, including allowing Medicare to negotiate prices for certain prescription drugs, requiring
drug manufacturers to pay a rebate to the federal government if prices for single-source drugs and biologicals covered under Medicare Part B and nearly all
covered  drugs  under  Part  D  increase  faster  than  the  rate  of  inflation  (CPI-U),  and  limiting  out  of  pocket  spending  for  Medicare  Part  D  enrollees.
Additionally, on October 14, 2022, President Biden signed Executive Order 14087 on “Lowering Prescription Drug Costs for Americans.” The Executive
Order specifically requests that the Center for Medicare and Medicaid Innovation consider “models that may lead to lower cost sharing for commonly used
drugs and support value-based payment that supports high-quality care.”

Additional Regulation

In  addition  to  the  foregoing,  state  and  federal  laws  regarding  environmental  protection  and  hazardous  substances,  including  the  Occupational
Safety  and  Health  Act,  the  Resource  Conservation  and  Recovery  Act  and  the  Toxic  Substances  Control  Act,  affect  our  business.  These  and  other  laws
govern  the  use,  handling  and  disposal  of  various  biologic,  chemical  and  radioactive  substances  used  in,  and  wastes  generated  by,  operations.  If  our
operations result in contamination of the environment or expose individuals to hazardous substances, we could be liable for damages and governmental
fines. Equivalent laws have been adopted in other countries that impose similar obligations.

U.S. Foreign Corrupt Practices Act

The  U.S.  Foreign  Corrupt  Practices  Act  (“FCPA”)  prohibits  U.S.  corporations  and  individuals  from  engaging  in  certain  activities  to  obtain  or
retain business abroad or to influence a person working in an official capacity. It is illegal to pay, offer to pay or authorize the payment of anything of value
to any foreign government official, government staff member, political party or political candidate in an attempt to obtain or retain business or to otherwise
influence a person working in an official capacity. The scope of the FCPA includes interactions with certain healthcare professionals in many countries.
Equivalent laws have been adopted in other foreign countries that impose similar obligations.

Human Capital

As  of  February  19,  2024,  we  had  229  full-time  employees,  primarily  engaged  in  research  and  development,  manufacturing,  administrative
activities, and commercial activities for VYJUVEK. None of our employees are represented by a labor union and we consider our employee relations to be
good.

27

We believe our employees are among the most important assets to our company and are key to achieving our goals and expectations. Our human
capital  resources  objectives  include,  as  applicable,  identifying,  recruiting,  retaining,  and  incentivizing  our  existing  and  new  employees.  We  offer  robust
compensation packages, including competitive base pay, incentive compensation and stock compensation programs, and provide a broad range of benefits.
The principal purpose of our stock compensation program is to attract, retain and reward personnel through the granting of stock-based awards, in order to
increase  stockholder  value  and  the  success  of  our  company  by  motivating  such  individuals  to  perform  to  the  best  of  their  abilities  and  achieve  our
objectives. In addition, we are committed to the professional advancement of our employees and offer various training programs and career development
opportunities.

Corporate Information

We  commenced  operations  in  April  2016.  In  March  2017,  we  converted  from  a  California  limited  liability  company  to  a  Delaware  C-
corporation, and changed our name from Krystal Biotech, LLC to Krystal Biotech, Inc. Our principal offices are located at 2100 Wharton Street, Suite 701,
Pittsburgh, PA 15203, and our telephone number is 412-586-5830. In June 2018, the Company incorporated an Australian subsidiary, for the purpose of
undertaking  preclinical  and  clinical  studies  in  Australia.  In  April  2019,  the  Company  incorporated  Jeune  Aesthetics,  Inc.  in  Delaware,  a  wholly-owned
subsidiary,  for  the  purpose  of  undertaking  preclinical  studies  for  aesthetic  skin  conditions.  In  January  2022,  August  2022,  December  2022,  and  August
2023,  we  incorporated  subsidiaries  in  Switzerland,  Netherlands,  France,  and  Germany,  respectively,  for  the  purpose  of  establishing  initial  operations  in
Europe for the development and commercialization of Krystal’s pipeline. Our website address is www.krystalbio.com. Our website and the information
contained on, or that can be accessed through, the website will not be deemed to be incorporated by reference in, and are not considered part of, this Annual
Report on Form 10-K. You should not rely on any such information in making your decision whether to purchase our common stock. Our Annual Report
on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments to reports filed or furnished pursuant to Sections 13(a)
and 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, are available free of charge on the investor relations section of our
website as soon as reasonably practicable after we electronically file such material with, or furnish it to the Securities and Exchange Commission, or the
SEC. The SEC also maintains a website that contains reports, proxy and information statements, and other information regarding the Company that we file
electronically with the SEC. The address of the website is http://www.sec.gov.

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Item 1A. Risk Factors.

Our  business  involves  significant  risks,  some  of  which  are  described  below.  You  should  carefully  consider  the  risks  and  uncertainties  described  below,
together with all of the other information contained in this Annual Report on Form 10-K, including “Management’s Discussion and Analysis of Financial
Condition and Results of Operations” and the consolidated financial statements and the related notes. If any of the following risks actually occur, it could
harm our business, prospects, operating results and financial condition and future prospects. In such event, the market price of our common stock could
decline,  and  you  could  lose  all  or  part  of  your  investment.  Additional  risks  and  uncertainties  not  presently  known  to  us  or  that  we  currently  deem
immaterial may also impair our business operations. This Annual Report on Form 10-K also contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of factors that are described
below and elsewhere in this Annual Report on Form 10-K.

Risks Related to Our Business and Industry

We are substantially dependent on the commercial success of VYJUVEK

To date, we have invested substantial efforts and financial resources in the research and development of our product candidates. Our near-term
prospects,  including  our  ability  to  develop  our  product  candidates  and  generate  revenue,  and  our  future  growth  is  substantially  dependent  on  the
commercial success of VYJUVEK.

Although we received approval from the FDA for VYJUVEK for the treatment of DEB on May 19, 2023, we can provide no assurances that we
will  obtain  regulatory  approval  in  any  other  jurisdiction,  which  would  have  an  adverse  impact  on  our  results  of  operations.  In  addition,  the  successful
commercialization of VYJUVEK will depend on a number of factors, including the risks identified in these “Risk Factors”. One or more of these factors,
many of which are beyond our control, could cause significant delays or an inability to successfully commercialize VYJUVEK.

We may not be successful in our efforts to identify, develop and commercialize additional product candidates, which may impair our ability to expand
our business and achieve our strategic objectives, and we may fail to capitalize on programs or product candidates that may be a greater commercial
opportunity or for which there is a greater likelihood of success.

Although a substantial amount of our efforts focuses on the commercialization of VYJUVEK and the development and potential approval of our
current product candidates, a key component our strategy is to identify, develop and potentially commercialize a portfolio of genetic medicines. Research
programs to identify new product candidates require substantial technical, financial, and human resources and may not be successful in identifying potential
product  candidates.  Even  if  we  identify  product  candidates  that  initially  show  promise,  we  may  fail  to  successfully  develop  and  commercialize  such
product candidates for many reasons, including the following:

•

•

•

•

•

competitors may develop alternatives that render our product candidates obsolete;

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

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

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

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

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

Additionally, because we have limited resources, we may forego or delay pursuit of opportunities with certain programs or product candidates or
for  indications  that  later  prove  to  have  commercial  potential.  Our  resource  allocation  decisions  may  cause  us  to  fail  to  timely  capitalize  on  viable
commercial  products  or  profitable  market  opportunities.  Our  spending  on  current  and  future  research  and  development  programs  may  not  yield  any
commercially viable products. If we do not accurately evaluate the commercial potential for a particular product candidate, we may relinquish valuable
rights to that product candidate through strategic collaboration, licensing, or other arrangements in cases in which it would have been more advantageous
for us to retain sole development and commercialization rights to such product candidate. Alternatively, we may allocate internal resources to a product
candidate in a therapeutic area in which it would have been more advantageous to enter into a partnering arrangement.

If any of these events occur, we may be forced to abandon our development efforts with respect to a particular product candidate or fail to develop
a  potentially  successful  product  candidate,  which  could  have  a  material  adverse  effect  on  our  business,  financial  condition,  results  of  operations,  and
prospects.

29

VYJUVEK and, if approved, our investigational product candidates regulated as biologics may face competition from biosimilars approved through an
abbreviated regulatory pathway.

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively, the
ACA, 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. 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
Biologics  License  Application,  or  BLA,  for  the  competing  product  containing  the  sponsor’s  own  preclinical  data  and  data  from  adequate  and  well-
controlled clinical trials to demonstrate the safety, purity, and potency of the other company’s product. In addition, a competitor may choose to challenge
our patent rights relating to the reference product by initiating litigation during the 12-year period of exclusivity. After the FDA approves the BLA for the
competing  product,  the  competitor  may  also  bring  a  declaratory  judgment  action  of  non-infringement,  invalidity,  and/or  unenforceability  of  our  patent
rights. 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.

We believe that any of our product candidates approved as a biological product under a BLA should qualify for the 12-year period of exclusivity.
However,  there  is  a  risk  that  this  exclusivity  could  be  shortened  due  to  congressional  action  or  otherwise,  or  that  the  FDA  will  not  consider  our
investigational  medicines  to  be  reference  products  for  competing  products,  potentially  creating  the  opportunity  for  generic  competition  sooner  than
anticipated.  Other  aspects  of  the  BPCIA,  some  of  which  may  impact  the  BPCIA  exclusivity  provisions,  have  also  been  the  subject  of  recent  litigation.
Moreover, the extent to which a biosimilar, once licensed, will be substituted for any one of our approved products in a way that is similar to traditional
generic substitution for non-biological products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing.

If competitors are able to obtain marketing approval for biosimilars referencing any of our approved products, our approved products may become
subject  to  competition  from  such  biosimilars,  which  would  impair  our  ability  to  successfully  commercialize  and  generate  revenue  from  sales  of  such
products.

We  face  significant  competition  in  an  environment  of  rapid  technological  change  and  the  possibility  that  our  competitors  may  achieve  regulatory
approval  before  us  or  develop  therapies  that  are  more  advanced  or  effective  than  ours,  which  may  adversely  affect  our  financial  condition  and  our
ability to successfully commercialize and market our product candidates.

We are aware of several companies and institutions that are currently developing alternative autologous or palliative gene therapy approaches for
our  targeted  indications,  including  DEB  and  cystic  fibrosis.  Many  of  our  potential  competitors,  alone  or  with  their  strategic  partners,  have  substantially
greater financial, technical, and other resources, such as larger research and development, clinical, marketing, and manufacturing organizations. Mergers
and  acquisitions  in  the  biotechnology  and  pharmaceutical  industries  may  result  in  even  more  resources  being  concentrated  among  a  smaller  number  of
competitors.  Our  commercial  opportunities  could  be  reduced  or  eliminated  if  competitors  develop  and  commercialize  products  that  are  safer,  more
effective, have fewer or less severe side effects, are more convenient or are less expensive than VYJUVEK or any product candidate that we may develop.
Competitors  also  may  obtain  FDA  or  other  regulatory  approval  for  their  products  more  rapidly  or  earlier  than  we  may  obtain  approval  for  our  product
candidates, which could result in our competitors establishing a strong market position before we are able to enter the market. Additionally, technologies
developed  by  our  competitors  may  render  VYJUVEK  or  any  of  our  product  candidates  uneconomical  or  obsolete,  and  we  may  not  be  successful  in
marketing VYJUVEK or any of our product candidates that obtain regulatory approval against competitors.

In  the  future,  even  if  we  commercialize  a  product  candidate  faster  than  our  competitors,  we  could  also  face  competition  from  lower  cost

biosimilars.

In addition, as a result of the expiration or successful challenge of our patent rights, we could face litigation with respect to the validity and/or
scope of patents relating to our competitors’ products. The availability of our competitors’ products could limit the demand, and the price we are able to
charge, for VYJUVEK or any product candidate that we may develop and commercialize.

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

We face an inherent risk of product liability lawsuits related to the sale of VYJUVEK, use of VYJUVEK and our product candidates, and testing
of our product candidates. Product liability claims may be brought against us by participants enrolled in our clinical trials, patients, health care providers or
others using, or administering VYJUVEK and our product

30

candidates. If we cannot successfully defend ourselves against any such claims, we may incur substantial liabilities. Regardless of their merit or eventual
outcome, liability claims may result in:

•

•

decreased demand for VYJUVEK;

injury to our reputation;

• withdrawal of clinical trial participants;

•

•

•

•

•

•

•

•

termination of clinical trial sites or entire trial programs;

increased regulatory scrutiny;

significant litigation costs;

substantial monetary awards to or costly settlement with claimants;

product recalls for any approved products or a change in the indications for which they may be used;

loss of revenue;

diversion of management and scientific resources from our business operations; and

the inability to successfully commercialize VYJUVEK or our product candidates, if approved.

With respect to VYJUVEK and any of our product candidates that are approved for commercial sale in the future, we are, and will be, highly
dependent upon physician and patient perceptions of us and the safety and quality of our products. We could be adversely affected if we are subject to
negative publicity. We could also be adversely affected if any of our products or any similar products distributed by other companies prove to be, or are
asserted to be, harmful to patients. Because of our dependence upon consumer perceptions, any adverse publicity could have a material adverse impact on
our financial condition or results of operations.

Our product liability insurance coverage may not be adequate to cover all liabilities that we may incur. We may need to increase our insurance
coverage now that VYJUVEK has been approved by the FDA and when we begin the commercialization of our product candidates, if approved. Insurance
coverage is becoming increasingly expensive. As a result, we may be unable to maintain or obtain sufficient insurance at a reasonable cost to protect us
against  losses  that  could  have  a  material  adverse  effect  on  our  business.  A  successful  product  liability  claim,  or  series  of  claims  brought  against  us,
particularly  if  judgments  exceed  any  insurance  coverage  we  may  have,  could  decrease  our  cash  resources  and  adversely  affect  our  business,  financial
condition, and results of operations.

Negative public opinion and increased regulatory scrutiny of gene therapy may damage public perception of the safety of our gene therapy product
candidates and adversely affect our ability to conduct our business or obtain regulatory approvals for our product candidates.

Gene therapy remains a novel technology. Ethical, social, and legal concerns about gene therapy could result in additional regulations restricting
or prohibiting VYJUVEK or our product candidates. Public perception may be influenced by claims that gene therapy is unsafe, and gene therapy may not
gain  the  acceptance  of  the  public  or  the  medical  community.  In  particular,  our  success  will  depend  upon  physicians  who  specialize  in  the  treatment  of
genetic  diseases  targeted  by  our  product  candidates  prescribing  treatments  that  involve  the  use  of  our  product  candidates  in  lieu  of,  or  in  addition  to,
existing treatments with which they are familiar and for which greater clinical data may be available. More restrictive government regulations or negative
public  opinion  would  have  an  adverse  effect  on  our  business,  financial  condition,  results  of  operations  and  prospects  and  may  delay  or  impair  the
development and commercialization of VYJUVEK or our product candidates or demand for VYJUVEK or any product candidates we may develop. For
example, earlier gene therapy trials led to several well- publicized adverse events, including cases of leukemia and death seen in trials using other vectors.
Serious  adverse  events  in  our  clinical  trials,  or  other  clinical  trials  involving  gene  therapy  products  or  our  competitors’  products,  even  if  not  ultimately
attributable to the relevant product candidates, and the resulting publicity, could result in increased government regulation, unfavorable public perception,
potential regulatory delays in the testing or approval of our product candidates, stricter labeling requirements for those product candidates that are approved
and a decrease in demand for any such product candidates.

Our business operations may subject us to disputes, claims and lawsuits, which may be costly and time-consuming and could materially and adversely
impact our financial position and results of operations.

From time to time, we may become involved in disputes, claims and lawsuits relating to our business operations. For example, we may, from time
to  time,  face  or  initiate  claims  related  to  intellectual  property  matters,  employment  matters,  or  commercial  matters.  Any  dispute,  claim  or  lawsuit  may
divert management’s attention away from our business, we may incur significant expenses in addressing or defending any dispute, claim or lawsuit, and we
may  be  required  to  pay  damage  awards  or  settlements  or  become  subject  to  equitable  remedies  that  could  adversely  affect  our  operations  and  financial
results. Litigation

31

related to these disputes may be costly and time-consuming and could materially and adversely impact our financial position and results of operations if
resolved against us. In addition, the uncertainty associated with litigation could lead to increased volatility in our stock price.

The increasing use of social media platforms presents new risks and challenges.

Social media is increasingly being used by us, our employees, or others to communicate about our business, VYJUVEK, our clinical development
programs,  DEB,  and  the  diseases  our  product  candidates  are  being  developed  to  treat.  We  use  appropriate  social  media  in  connection  with  our
commercialization efforts of VYJUVEK and intend to use it in connection with our commercialization efforts of our product candidates, if approved. Social
media practices in the biotechnology and biopharmaceutical industries continue to evolve, and regulations and regulatory guidance relating to such use are
evolving  and  not  always  clear.  This  evolution  creates  uncertainty  and  risk  of  noncompliance  with  regulations  applicable  to  our  business,  resulting  in
potential  regulatory  actions  against  us,  along  with  the  potential  for  litigation  and  heightened  scrutiny  by  the  FDA,  the  Securities  and  Exchange
Commission, or the SEC, and other regulators. For example, patients may use social media channels to comment on their experience in an ongoing clinical
trial of our product candidates, or to report an alleged adverse event. If such disclosures occur, there is a risk that clinical trial enrollment may be adversely
impacted, that we may fail to monitor and comply with applicable adverse event reporting obligations, or that we may not be able to defend our business or
the public’s legitimate interests in the face of the political and market pressures generated by social media due to restrictions on what we may say about our
product  candidates.  There  is  also  a  risk  of  inappropriate  disclosure  of  sensitive  information,  loss  of  trade  secrets  or  other  intellectual  property,  public
exposure  of  personal  information  of  our  employees,  patients  who  use  VYJUVEK,  clinical  trial  patients,  and  others,  or  negative  or  inaccurate  posts  or
comments  about  us  on  any  social  networking  website.  In  addition,  we  may  encounter  attacks  on  social  media  regarding  our  company,  management,
VYJUVEK,  or  our  product  candidates  that  seriously  damage  our  reputation,  brand  image,  and  goodwill.  If  any  of  these  events  were  to  occur  or  we
otherwise fail to comply with applicable regulations, we could incur liability, face regulatory actions, or incur other harm to our business that could have a
material adverse effect on our business, prospects, operating results, and financial condition and could adversely affect the price of our common stock.

We have experienced significant growth in the number of employees and infrastructure and may experience difficulties in managing this growth. If we
are unable to manage expected growth in the scale and complexity of our operations, our performance may suffer.

We have experienced a period of significant expansion in personnel and of our facilities, infrastructure and overhead as we developed our own
manufacturing facilities, built our sales, marketing and distribution infrastructure that we believe is necessary to commercialize VYJUVEK, and increased
our  research  and  development  efforts.  The  commercialization  of  VYJUVEK  and  our  ongoing  development  of  other  product  candidates  will  continue  to
impose significant capital requirements, as well as added responsibilities on members of management, including the need to identify, recruit, maintain and
integrate new personnel. Our future financial performance and our ability to compete effectively will depend, in part, on our ability to manage our growth
effectively. If we are successful in executing our business strategy, we will need to expand our managerial, operational, financial, and other systems and
resources to manage our operations, continue our research and development activities and build a commercial infrastructure to support commercialization
of any of our product candidates that are approved for sale. Future growth would impose significant added responsibilities on members of management.
Our management, finance, development personnel, systems, and facilities currently in place may not be adequate to support this expected future growth.
Our need to effectively manage our operations, growth and product candidates requires that we continue to develop more robust business processes and
improve  our  systems  and  procedures  in  each  of  these  areas  and  to  attract  and  retain  enough  numbers  of  talented  employees.  We  may  be  unable  to
successfully implement these tasks on a larger scale and, accordingly, may not achieve our research, development, and growth goals.

Our future success depends on our ability to retain key employees and scientific advisors and to attract, retain and motivate qualified personnel.

We  are  highly  dependent  on  members  of  our  management  team,  the  loss  of  whose  services  may  adversely  impact  the  achievement  of  our
objectives. Our employees and scientific advisors are at-will employees and consultants, and the loss of one or more of them might impede the achievement
of our research, development, and commercialization objectives.

Recruiting and retaining other qualified employees and scientific advisors for our business, including scientific and technical personnel, also will
be critical to our success. Competition for skilled personnel, including in gene therapy research and vector manufacturing, is intense and the turnover rate
can  be  high.  We  may  not  be  able  to  attract  and  retain  personnel  on  acceptable  terms  given  the  competition  among  numerous  pharmaceutical  and
biotechnology companies and academic institutions for individuals with similar skill sets. In addition, failure to succeed in preclinical or clinical trials or
applications for marketing approval may make it more challenging to recruit and retain qualified personnel. The inability to recruit, or loss of services of
certain executives, key employees, or advisors, may impede the progress of our research, development and

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commercialization objectives and have a material adverse effect on our business, financial condition, results of operations and prospects.

Our employees, principal investigators and advisors may engage in misconduct or other improper activities, including non-compliance with regulatory
standards and requirements.

We are exposed to the risk of fraud or other misconduct by our employees, principal investigators, and advisors. Misconduct by these parties could
include intentional failures to comply with FDA regulations or the regulations applicable in the European Union, or EU, and other jurisdictions, provide
accurate information to the FDA, the European Medicines Agency (“EMA”) and other regulatory authorities, comply with healthcare fraud and abuse laws
and regulations in the United States and abroad, report financial information or data accurately or disclose unauthorized activities to us. Sales, marketing,
and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, misconduct, kickbacks, self-
dealing and other abusive practices. These laws and regulations restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales
commission, customer incentive programs and other business arrangements. It is not always possible to identify and deter employee misconduct, 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
government investigations or other actions or lawsuits stemming from a failure to comply with these laws or regulations. If any such actions are instituted
against us and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business, financial
condition, results of operations and prospects, including the imposition of significant fines, criminal penalties, or other sanctions.

In  addition,  principal  investigators  for  our  clinical  trials  may  serve  as  scientific  advisors  or  consultants  to  us  from  time  to  time  and  receive
compensation in connection with such services. Under certain circumstances, we may be required to report some of these relationships to the FDA. The
FDA may conclude that a financial relationship between us and a principal investigator has created a conflict of interest or otherwise affected interpretation
of the clinical trial. The FDA may therefore question the integrity of the data generated at the applicable clinical trial site and the utility of the clinical trial
itself may be jeopardized. This could result in a delay in approval, or rejection, of our marketing applications by the FDA and may ultimately lead to the
denial of marketing approval of our current and future product candidates.

Healthcare legislative reform measures may have a material adverse effect on our business and results of operations.

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

In the United States, there have been and continue to be a number of legislative efforts to contain healthcare costs. Any legislative changes that
result in price controls, reduce access to and reimbursement for care or add additional regulations may have an adverse effect on our financial condition and
results of operations. Any changes that reduce, or impede the ability to obtain, reimbursement for VYJUVEK or our product candidates that we intend to
commercialize in the United States could adversely affect successful commercialization of VYJUVEK and our plans to introduce our product candidates in
the United States. For example, the Bipartisan Budget Act of 2018, among other things, amended the ACA, effective January 1, 2019, to increase from 50
percent to 70 percent the point-of-sale discount that is owed by pharmaceutical manufacturers who participate in Medicare Part D and to close the coverage
gap in most Medicare drug plans, commonly referred to as the “donut hole.”

Other legislative changes have been proposed and adopted in the United States since the ACA was enacted. For example, in August 2011, the
Budget Control Act of 2011, among other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction,
tasked with recommending a targeted deficit reduction of at least $1.2 trillion for the years 2012 through 2021, was unable to reach required goals, thereby
triggering the legislation’s automatic reduction to several government programs. This includes aggregate reductions of Medicare payments to providers of
up to 2% per fiscal year, which went into effect in April 2013 and will remain in effect through 2027 unless additional Congressional action is taken. In
January 2013, the American Taxpayer Relief Act of 2012, among other things, further reduced Medicare payments to certain providers, and increased the
time for Medicare contractors to recoup Medicare overpayments to providers from three to five years. In August 2022, the Inflation Reduction Act of 2022
(“IRA”) was signed into law. The IRA includes several provisions to lower prescription drug costs for people with Medicare and reduce drug spending by
the federal government. In relevant part, the IRA allows Medicare to negotiate prices for certain prescription drugs, requires drug manufacturers to pay a
rebate to the federal government if prices for single-source drugs and biologicals covered under Medicare Part B and nearly all covered drugs under Part D
increase faster than the rate of inflation, caps out of pocket spending for Medicare Part D enrollees, and makes other benefit design changes to Medicare
Part D intended to lower drug costs for enrollees and Medicare. Implementation of these changes began in 2023, and will continue to be implemented over
the next several years. Multiple pharmaceutical manufacturers have challenged the law in court, largely on constitutional grounds. These suits will continue
through 2024 and the ultimate effects of such legal challenges are unclear. At this time, we continue to

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evaluate the effect of the IRA on our business operations and financial condition and results as the full impact of the IRA remains uncertain.

Further, there has been heightened governmental scrutiny in recent years over the manner in which manufacturers set prices for their marketed
products  and  the  cost  of  prescription  drugs  to  consumers  and  government  healthcare  programs,  which  have  resulted  in  several  recent  Congressional
inquiries and proposed and enacted bills designed to, among other things, reduce the cost of prescription drugs, bring more transparency to product pricing,
review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for products.
In addition, the United States government, state legislatures, and foreign governments have shown significant interest in implementing cost containment
programs, including price-controls, restrictions on reimbursement and requirements for substitution of generic products for branded prescription drugs to
limit  the  growth  of  government  paid  health  care  costs.  For  example,  the  United  States  government  has  passed  legislation  requiring  pharmaceutical
manufacturers to provide rebates and discounts to certain entities and governmental payors to participate in federal healthcare programs. Individual states in
the  United  States  have  also  been  increasingly  passing  legislation  and  implementing  regulations  designed  to  control  pharmaceutical  product  pricing,
including  price  or  patient  reimbursement  constraints,  discounts,  restrictions  on  certain  product  access  and  marketing  cost  disclosure  and  transparency
measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

Additional changes may affect our business, including those governing enrollment in federal healthcare programs, reimbursement changes, fraud
and abuse enforcement, and expansion of new programs, such as Medicare payment for performance initiatives. In October 2022, President Biden signed
Executive Order 14087 on “Lowering Prescription Drug Costs for Americans.” The Executive Order specifically requests that the Center for Medicare and
Medicaid Innovation consider “models that may lead to lower cost sharing for commonly used drugs and support value-based payment that supports high-
quality care.” The outcomes of the findings made under the Executive Order could lead to further drug pricing initiatives that could affect reimbursement
for our product and product candidates.

These initiatives, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria and
in  additional  downward  pressure  on  the  price  that  we  receive  for  any  approved  product.  Any  reduction  in  reimbursement  from  Medicare  or  other
government  programs  may  result  in  a  similar  reduction  in  payments  from  private  payors.  The  implementation  of  cost  containment  measures  or  other
healthcare reforms could result in reduced demand for our product and product candidates or additional pricing pressures and may adversely impact our
ability to generate sufficient revenue, attain consistent profitability, or commercialize our product candidates, if approved.

We  are  subject,  directly  or  indirectly,  to  federal  and  state  healthcare  fraud  and  abuse  laws,  false  claims  laws  and  health  information  privacy  and
security laws. If we are unable to comply, or have not fully complied, with such laws, we could face substantial penalties.

With  the  FDA  approval  of  VYJUVEK,  our  operations  are  directly,  or  indirectly  through  our  prescribers,  customers,  and  purchasers,  subject  to
various federal and state fraud and abuse laws and regulations, including, without limitation, the federal Anti-Kickback Statute, federal civil and criminal
false  claims  laws  and  the  Physician  Payments  Sunshine  Act  and  regulations.  These  laws  impact,  among  other  things,  our  sales,  marketing,  access
assistance, sponsored genetic patient testing, and educational programs. In addition, we are subject to patient privacy laws by both the federal government
and the states in which we conduct our business as well as other jurisdictions. The laws that affect our operations include, but are not limited to:

•

•

•

the  federal  Anti-Kickback  Statute,  which  prohibits,  among  other  things,  persons  or  entities  from  knowingly  and  willfully  soliciting,  receiving,
offering  or  paying  any  remuneration  (including  any  kickback,  bribe  or  rebate),  directly  or  indirectly,  overtly  or  covertly,  in  cash  or  in  kind,  in
return for the purchase, recommendation, leasing or furnishing of an item or service reimbursable under a federal healthcare program, such as the
Medicare and Medicaid programs. This statute has been interpreted to apply to arrangements between pharmaceutical manufacturers on the one
hand, and prescribers, purchasers, and formulary managers on the other. The ACA amended the intent requirement of the federal Anti-Kickback
Statute to clarify that a person or entity does not have to have actual knowledge of this statute or specific intent to violate it;

federal  civil  and  criminal  false  claims  laws  and  civil  monetary  penalty  laws  which  prohibit,  among  other  things,  individuals  or  entities  from
knowingly presenting, or causing to be presented, claims for payment or approval from Medicare, Medicaid, or other government payors that are
false or fraudulent. The ACA provides that a claim for items or services resulting from an Anti-Kickback Statute violation is a false claim under
the federal False Claims Act (“FCA”). Cases against pharmaceutical manufacturers support the view that certain marketing practices, including
off-label promotion, may implicate the FCA;

the  federal  Health  Care  Fraud  statute  imposes  criminal  and  civil  liability  for  executing  a  scheme  to  defraud  any  healthcare  benefit  program  or
making false statements relating to healthcare matters;

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•

•

•

•

the Health Insurance Portability and Accountability Act of 1996 (“HIPAA”), as amended by the Health Information Technology for Economic and
Clinical Health Act (“HITECH”), and its implementing regulations, and as amended again by the final HIPAA omnibus rule (the “Omnibus Rule”
and together with HIPAA and HITECH, the HIPAA Rules), which impose certain requirements relating to the privacy, security and transmission
of individually identifiable health information by certain entities subject to the HIPAA Rules, such as health plans, health care clearinghouses and
health care providers that engage in certain covered transactions;

federal transparency laws, including the federal Physician Payment Sunshine Act, that require certain manufacturers of drugs, devices, biologics
and  medical  supplies  for  which  payment  is  available  under  Medicare,  Medicaid  or  the  Children’s  Health  Insurance  Program,  with  specific
exceptions, to report annually to the Centers for Medicare and Medicaid Services (“CMS”) information related to: (i) payments or other “transfers
of value” made to physicians and teaching hospitals, and (ii) ownership and investment interests held by physicians and their immediate family
members;

state  and  foreign  law  equivalents  of  each  of  the  above  federal  laws,  state  laws  that  require  drug  manufacturers  to  report  information  related  to
payments and other transfers of value to physicians and other healthcare providers or marketing expenditures and state laws governing the privacy
and security of health information in certain circumstances, many of which differ from each other in significant ways and may not have the same
effect, thus complicating compliance efforts in certain circumstances, such as specific disease states; and

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

Because  of  the  breadth  of  these  laws  and  the  narrowness  of  the  statutory  exceptions  and  safe  harbors  available,  it  is  possible  that  some  of  our
business activities could be subject to challenge under one or more of such laws. If our operations are found to be in violation of any of the laws described
above  or  any  other  government  regulations  that  apply  to  us,  we  may  be  subject  to  penalties,  including  civil  and  criminal  penalties,  damages,  fines,
exclusion from participation in government health care programs, such as Medicare and Medicaid, imprisonment and the curtailment or restructuring of our
operations, any of which could adversely affect our ability to operate our business and our results of operations.

Often, to avoid the threat of treble damages and penalties under the FCA, health care providers will resolve allegations in a settlement without

admitting liability. Any such settlement could materially affect our business, financial operations, and reputation.

Efforts  to  ensure  that  our  business  arrangements  with  third  parties  comply  with  applicable  healthcare  laws  and  regulations  involve  substantial
costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or
case law involving applicable fraud and abuse or other healthcare laws and regulations.

The risk of our being found in violation of these laws is increased by the fact that many of them have not been fully interpreted by the regulatory
authorities  or  the  courts,  and  their  provisions  are  open  to  a  variety  of  interpretations.  Any  action  against  us  for  violation  of  these  laws,  even  if  we
successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business.
The  shifting  compliance  environment  and  the  need  to  build  and  maintain  a  robust  and  expandable  systems  to  comply  with  multiple  jurisdictions  with
different compliance and/or reporting requirements increases the possibility that we may run afoul of one or more of the requirements.

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

We  are  subject  to  numerous  environmental,  health  and  safety  laws  and  regulations,  including  those  governing  laboratory  procedures  and  the
generation, handling, use, storage, treatment, manufacture, transportation, and disposal of, and exposure to, hazardous materials and wastes, as well as laws
and regulations relating to occupational health and safety. Our operations involve the use of hazardous and flammable materials, including chemicals and
biologic materials. Our operations also produce hazardous waste products. We generally contract with third parties for the disposal of these materials and
wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of
hazardous materials, we could be held liable for any resulting damages, and any liability could exceed our resources. Moreover, certain environmental laws
may impose liability without regard to fault or legality of the action at the time of its occurrence. We also could incur significant costs associated with civil
or criminal fines and penalties. 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 trials or regulatory approvals could be suspended.

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Although we maintain workers’ compensation insurance for certain costs and expenses we may incur due to injuries to our employees resulting
from the use of hazardous materials or other work-related injuries, this insurance may not provide adequate coverage against potential liabilities. We do not
maintain insurance for toxic tort claims that may be asserted against us in connection with our storage or disposal of biologic or hazardous materials. We
also may incur substantial costs to comply with current or future environmental, health and safety laws and regulations, which have tended to become more
stringent over time. These current or future laws and regulations may impair our research, development, or production efforts. Failure to comply with these
laws and regulations also may result in substantial fines, penalties or other sanctions or liabilities, which could materially adversely affect our business,
financial condition, results of operations and prospects.

We are subject to stringent and evolving U.S. and foreign laws, regulations and other obligations related to privacy and data security. Our actual or
perceived  failure  to  comply  with  such  obligations  could  lead  to  regulatory  inquiries  or  actions,  litigation,  fines  and  penalties,  disruptions  to  our
business operations, reputational harm, loss of revenue, and other adverse business consequences.

Privacy and data security have become significant areas of legal and regulatory focus in the United States, European Union and in many other
jurisdictions  where  we  conduct  or  may  conduct  our  operations.  In  our  ordinary  course  of  business,  we  collect,  receive,  store,  process,  generate,  use,
transfer,  disclose,  make  accessible,  protect,  secure,  dispose  of,  transmit,  and  share  (collectively,  “process”)  personal  information  and  other  sensitive
information,  including,  but  not  limited  to,  health  information,  individuals’  financial  information,  as  well  as  proprietary  and  confidential  business  data,
including trade secrets, intellectual property, and sensitive third-party data (collectively, “sensitive data”). Our data processing activities may subject us to
numerous privacy and data security obligations, including, but not limited to, domestic and international laws, regulations, guidance, industry standards,
external and internal privacy and security policies, and contractual requirements.

In  the  United  States,  federal,  state,  and  local  governments  have  enacted  numerous  data  privacy  and  security  laws,  including  data  breach
notification laws, personal information privacy laws, consumer protection laws, and other similar laws. Notably, HIPAA, as amended by HITECH, imposes
requirements  on  certain  entities  regarding  the  privacy,  security,  and  transmission  of  individually  identifiable  health  information  and  the  California
Consumer  Privacy  Act  of  2018  (“CCPA”)  requires  businesses  to  provide  specific  disclosures  in  their  privacy  notices  and  honor  California  residents’
privacy rights. The CCPA provides for civil penalties of up to $7,500 per violation and allows private litigants affected by certain data breaches to recover
significant statutory damages. Although the CCPA does not apply to certain data that we process in the context of clinical trials, efforts to comply with the
CCPA may increase our annual compliance costs and subject us to potential liability with respect to other personal information we may maintain about
California residents. In addition, the California Privacy Rights Act of 2020 (“CPRA”), which came into effect on January 1, 2023, expanded the CCPA’s
requirements, extending it to cover personal information of business representatives and employees and the CPRA established a new regulatory agency to
implement and enforce the law. Other states, such as Virginia, Nevada, and Colorado, have also passed comprehensive privacy laws, and similar laws are
being considered in several other states, as well as at the federal and local levels. While these states’ laws, like the CCPA, also exempt some data processed
in the context of clinical trials, these developments further complicate our compliance efforts and increase both legal risk and compliance costs for us and
the third parties upon whom we rely.

Outside of the United States, there are an increasing number of laws, regulations, and industry standards regarding privacy and data security. For
example,  the  EU  General  Data  Protection  Regulation  (“GDPR”)  and  UK  GDPR  impose  strict  requirements  for  processing  personal  information,  and
companies that violate the GDPR may face temporary or permanent bans on certain data processing activities and they may be subject to other penalties
such as fines of up to 20 million Euros under the EU GDPR / 17.5 million pounds sterling under the UK GDPR or 4% of annual global revenue, whichever
is  greater;  or  private  litigation  related  to  processing  of  personal  information  brought  by  classes  of  data  subjects  or  consumer  protection  organizations
authorized to represent data subjects’ interests.

In some circumstances, we may be unable to transfer personal information between certain jurisdictions due to data localization requirements or
other  limitations  on  cross-border  data  flows.  Europe  and  other  jurisdictions  have  enacted  laws  requiring  data  to  be  localized  or  limiting  the  transfer  of
personal  information  to  other  countries.  In  particular,  the  European  Economic  Area  (“EEA”)  and  the  UK  have  significantly  restricted  the  transfer  of
personal information to the United States and other countries whose privacy laws they consider inadequate. Although there are various mechanisms that
may be used to transfer personal information from the EEA and UK to the United States in compliance with the law, such as the EEA and UK’s standard
contractual  clauses,  these  mechanisms  are  subject  to  legal  challenges,  and  we  may  be  unable  to  rely  on  these  measures  to  lawfully  transfer  personal
information  to  the  United  States  in  all  cases.  If  there  is  no  lawful  manner  for  us  to  transfer  personal  information  from  the  EEA,  the  UK,  or  other
jurisdictions to the United States, or if the requirements for a legally compliant transfer are too onerous, we could face significant adverse consequences,
including increased exposure to regulatory actions, substantial fines and penalties, the inability to transfer data and work with partners, vendors and other
third parties, and injunctions against our processing or transferring of personal information necessary to operate our business. Some European regulators
have  ordered  certain  companies  to  suspend  or  permanently  cease  certain  transfers  of  personal  information  to  recipients  outside  Europe  for  allegedly
violating the EU GDPR’s cross-border data transfer limitations. Additionally, companies

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that  transfer  personal  information  to  recipients  outside  of  the  EEA  and/or  UK  to  other  jurisdictions,  particularly  to  the  United  States,  are  subject  to
increased scrutiny from regulators, individual litigants, and activist groups.

In addition to any applicable privacy and data security laws and regulations, we may be subject to industry standards adopted by industry groups
or bound by other contractual obligations related to privacy and data security. We may publish privacy policies, marketing materials, and other statements,
such as compliance with certain certifications or self-regulatory principles, regarding data privacy and security. If these policies, materials, or statements
are  found  to  be  deficient,  lacking  in  transparency,  deceptive,  unfair,  or  misrepresentative  of  our  practices,  we  may  be  subject  to  regulatory  inquiries,
regulatory enforcement actions and other adverse consequences.

Our obligations related to privacy and data security are quickly changing, becoming increasingly stringent, and creating regulatory uncertainty.
Additionally, these obligations may be subject to differing applications and interpretations, which may be inconsistent between jurisdictions. Preparing for
and complying with these obligations requires us to devote significant resources and may necessitate changes to our information technologies, systems, and
practices and to those of any third parties that process personal information or other sensitive data on our behalf.

We may at times fail (or be perceived to have failed) in our efforts to comply with our privacy and data security obligations. Moreover, despite our
efforts,  our  personnel  or  third  parties  on  whom  we  rely  on  may  fail  to  comply  with  such  obligations,  which  could  negatively  impact  our  business
operations. If we or the third parties that process personal information or other sensitive data our behalf fail, or are perceived to have failed, to address or
comply  with  applicable  privacy  and  data  security  obligations,  we  could  face  significant  consequences,  including  but  not  limited  to:  government
enforcement  actions  (e.g.,  investigations,  fines,  penalties,  audits,  and  inspections);  litigation  (including  class-action  claims);  additional  reporting
requirements and/or oversight; bans on processing personal information; and orders to destroy or not use personal information. Any of these events could
have a material adverse effect on our reputation, business, or financial condition, including but not limited to loss of customers; significant reputational
harm;  an  inability  to  process  personal  information  or  to  operate  in  certain  jurisdictions;  limited  ability  to  commercialize  VYJUVEK  or  develop  and
commercialize our product candidates; expenditures of time and resources to defend ourselves against claims or inquiries; adverse publicity; or substantial
changes to our business model or operations.

Unfavorable global economic 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, including
high inflation and interest rates and concerns of a recession in the United States or other major markets due to a number of factors. For example, inflation
and rising interest rates have caused volatility and disruptions in the capital and credit markets, and it is unclear how long such volatility will continue. In
addition, Russia’s invasion of Ukraine and/or the Israel-Hamas conflict may lead to a prolonged, adverse impact on global economic, sociopolitical and
market  conditions.  A  severe  or  prolonged  economic  downturn  could  result  in  a  variety  of  risks  to  our  business,  including  our  ability  to  raise  additional
capital when needed or on acceptable terms, if at all. A weak or declining economy, sanctions, trade restrictions and other global conditions could also
strain our suppliers, possibly resulting in supply delays or disruptions. Any of the foregoing could harm our business and we cannot anticipate all the ways
in which the current economic climate and financial market conditions could adversely impact our business, financial condition, results of operations, and
prospects.

Our internal computer systems, or those of our collaborators or other contractors or consultants, may fail or suffer a cyber-security incident, such as a
data  breach  or  computer  virus,  which  could  harm  our  business  by  damaging  our  reputation,  exposing  us  to  liability,  or  materially  disrupting  our
operations, including production of VYJUVEK or our product development programs.

We  receive,  process,  store,  and  transmit,  often  electronically,  confidential  data  of  others,  including  the  participants  in  our  clinical  trials.
Unauthorized access to our or our collaborators’ computer systems or stored data could result in the theft or improper disclosure of personal or confidential
information or other sensitive data, the deletion or modification of records, or could cause interruptions in our operations. Cybersecurity threats include, but
are  not  limited  to,  ransomware  attacks,  phishing  attempts,  and  the  exploitation  of  software  vulnerabilities  to  gain  access  to  our  information  technology
environment,  and  cyber-security  risks  increase  when  we  transmit  information  from  one  location  to  another,  including  transmissions  over  the  Internet  or
other electronic networks. Despite our robust security measures and our commitment to implementing and continually improving our cybersecurity posture
to  mitigate  the  risk  of  a  cybersecurity  incident,  we  cannot  guarantee  that  such  incidents  will  not  occur.  Any  cybersecurity  incident,  even  if  promptly
addressed, may harm our reputation, damage our brand, and erode trust. Our facilities and systems, and those of our third-party service providers, may also
be vulnerable to acts of vandalism, software viruses, misplaced or lost data, programming and/or human errors, or other similar events which may disrupt
our operations or expose personal and confidential information.

Moreover, in the event of a cybersecurity incident, we may face investigations, legal actions, including class action litigation, regulatory inquiries,
and regulatory enforcement actions. We may also be subject to fines, consent orders, or mandated corrective actions that could have a material adverse
impact on our operations and financial position. Furthermore,

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cybersecurity incidents and their legal consequences may impact investor confidence, potentially leading to a decrease in our stock price or limitations on
our access to capital markets. If such an event were to occur and cause material interruptions in our operations, it could result in a material disruption of our
development programs and our business operations, whether due to a loss of our trade secrets or other proprietary information. For example, the loss of
clinical trial data from completed or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to
recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or
inappropriate  disclosure  of  confidential  or  proprietary  information,  we  could  incur  liability,  our  competitive  position  could  be  harmed,  and  the  further
development and commercialization of our product candidates could be delayed.

Certain data breaches must be reported to affected individuals and various government and/or regulatory agencies, and in some cases to the media,
under provisions of HIPAA, as amended by HITECH, other U.S. federal and state law, and requirements of non-U.S. jurisdictions, including the EU GDPR
and relevant member state law in the European Union and other foreign laws, and financial penalties may also apply. Our insurance policies may not be
adequate to compensate us for the potential losses arising from breaches, failures or disruptions of our infrastructure, catastrophic events and disasters or
otherwise. In addition, such insurance may not be available to us in the future on economically reasonable terms, or at all. Further, our insurance may not
cover  all  claims  made  against  us  and  defending  a  suit,  regardless  of  its  merit,  could  be  costly  and  divert  management’s  attention.  Any  security  breach
involving the misappropriation, loss or other unauthorized disclosure or use of confidential information of others, whether by us or a third-party, could: (i)
subject  us  to  civil  and  criminal  penalties;  (ii)  have  a  negative  impact  on  our  reputation;  or  (iii)  expose  us  to  liability  to  third  parties  or  government
authorities.

Our business continuity and disaster recovery plans may not adequately protect us from a serious disaster.

Natural disasters could severely disrupt our operations or the operations of third-party suppliers or service providers and have a material adverse
effect on our business, financial condition, results of operations and prospects. The severity and frequency of weather-related natural disasters have been
amplified,  and  are  expected  to  continue  to  be  amplified  by,  global  climate  change.  Such  natural  disasters  may  cause  damage  to  and/or  disrupt  our
operations,  which  may  result  in  a  material  adverse  effect  on  our  VYJUVEK  sales,  our  other  product  candidates,  business,  and  results  of  operations.
Moreover, climate change may also result in various chronic physical changes, such as changes in temperature or precipitation patterns or sea-level rise,
that may also have an adverse impact on our operations. Our suppliers, vendors and business partners also face similar risks, and any disruption to their
operations could have an adverse effect on our supply and manufacturing chain. 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  manufacturing  facilities,  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 that we have in place currently are limited and may not prove adequate in the event of a serious disaster or similar
event. A significant portion of our current supply of drug product for VYJUVEK and our product candidates is located at our manufacturing facilities in
Pittsburgh, Pennsylvania. We may incur substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which
could have a material adverse effect on our business, financial condition, results of operations and prospects.

Increased attention to, and evolving expectations for, environmental, social, and governance (“ESG”) initiatives could increase our costs, harm our
reputation, or otherwise adversely impact our business.

Companies  across  industries  are  facing  increasing  scrutiny  from  a  variety  of  stakeholders  related  to  their  ESG  and  sustainability  practices.
Expectations  regarding  voluntary  ESG  initiatives  and  disclosures  may  result  in  increased  costs  (including  but  not  limited  to  increased  costs  related  to
compliance, stakeholder engagement, contracting and insurance), enhanced compliance or disclosure obligations, or other adverse impacts to our business,
financial condition, or results of operations.

While we may at times engage in voluntary initiatives (such as voluntary disclosures, certifications, or goals, among others) to improve the ESG
profile of our company and/or product and product candidates, such initiatives may be costly and may not have the desired effect. Moreover, we may not be
able  to  successfully  complete  such  initiatives  due  to  factors  that  are  within  or  outside  of  our  control.  Even  if  this  is  not  the  case,  our  actions  may
subsequently be determined to be insufficient by various stakeholders, and we may be subject to investor or regulator engagement on our ESG efforts, even
if such initiatives are currently voluntary.

Certain  market  participants,  including  major  institutional  investors  and  capital  providers,  use  third-party  benchmarks  and  scores  to  assess
companies’ ESG profiles in making investment or voting decisions. Unfavorable ESG ratings could lead to increased negative investor sentiment towards
us or our industry, which could negatively impact our share price as well as our access to and cost of capital. Furthermore, certain investors have been
engaged in “anti-ESG” campaigns, and, to the extent we take actions that are seen as positive to some investors other investors may take issue with such
actions. To the extent ESG matters negatively impact our reputation, it may also impede our ability to compete as effectively to attract and retain employees
or customers, which may adversely impact our operations.

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In  addition,  we  expect  there  will  likely  be  increasing  levels  of  regulation,  disclosure-related  and  otherwise,  with  respect  to  ESG  matters.  For
example, the SEC has published proposed rules that would require companies to provide significantly expanded climate-related disclosures in their periodic
reporting,  which  may  require  us  to  incur  significant  additional  costs  to  comply,  including  the  implementation  of  significant  additional  internal  controls
processes  and  procedures  regarding  matters  that  have  not  been  subject  to  such  controls  in  the  past,  and  impose  increased  oversight  obligations  on  our
management and board of directors. These and other changes in stakeholder expectations will likely lead to increased costs as well as scrutiny that could
heighten all of the risks identified in this risk factor. Additionally, our customers and suppliers may be subject to similar expectations, which may augment
or create additional risks, including risks that may not be known to us.

Our international operations may expose us to business, regulatory, political, operational, financial, pricing and reimbursement and economic risks
associated with doing business outside of the United States.

We  currently  have  operations  and  employees  located  outside  the  United  States  and  our  business  strategy  incorporates  potential  additional
international expansion to target patient populations outside the United States. Doing business internationally involves a number of risks, including, but not
limited to:

• multiple, conflicting, and changing laws and regulations such as privacy regulations, tax laws, export and import restrictions, employment laws,

regulatory requirements, and other governmental approvals, permits, and licenses;

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failure by us to obtain and maintain regulatory approvals for the use of our product candidates in various countries;

additional potentially relevant third-party patent rights;

complexities and difficulties in obtaining protection and enforcing our intellectual property;

difficulties in staffing and managing foreign operations;

complexities associated with managing multiple payor reimbursement regimes, government payors, or patient self-pay systems;

limits in our ability to penetrate international markets;

financial  risks,  such  as  longer  payment  cycles,  difficulty  collecting  accounts  receivable,  the  impact  of  local  and  regional  financial  crises  on
demand and payment for our products, and exposure to foreign currency exchange rate fluctuations;

natural disasters, political and economic instability, including wars, terrorism, and political unrest, outbreak of disease, boycotts, curtailment of
trade, and other business restrictions;

certain expenses including, among others, expenses for travel, translation, and insurance; and

regulatory  and  compliance  risks  that  relate  to  maintaining  accurate  information  and  control  over  sales  and  activities  that  may  fall  within  the
purview of the U.S. Foreign Corrupt Practices Act, its books and records provisions, or its anti-bribery provisions.

Any of these factors could significantly harm our potential international expansion and operations and, consequently, our results of operations.

We  are  subject  to  U.S.  and  certain  foreign  export  and  import  controls,  anti-corruption  laws  and  anti-money  laundering  laws  and  regulations.
Compliance with these legal standards could impair our ability to compete in domestic and international markets. We can face criminal liability and
other serious consequences for violations, which can harm our business.

We  are  subject  to  export  control  and  import  laws  and  regulations,  including  the  U.S.  Export  Administration  Regulations,  U.S.  Customs
regulations, and various economic and trade sanctions regulations administered by the U.S. Treasury Department’s Office of Foreign Assets Controls, and
anti-corruption and anti-money laundering laws and regulations, including the U.S. Foreign Corrupt Practices Act of 1977, as amended, the U.S. domestic
bribery  statute  contained  in  18  U.S.C.  §  201,  the  U.S.  Travel  Act,  the  USA  PATRIOT  Act,  and  other  state  and  national  anti-bribery  and  anti-money
laundering laws in the countries in which we conduct activities. Anti-corruption laws are interpreted broadly and prohibit companies and their employees,
agents,  contractors  and  other  collaborators  and  partners  from  authorizing,  promising,  offering,  providing,  soliciting,  or  receiving,  directly  or  indirectly,
improper payments or anything else of value to recipients in the public or private sector. We may engage third parties to sell VYJUVEK or our product
candidates, if approved, abroad and/or to obtain necessary marketing authorizations, permits, licenses, patent registrations and other regulatory approvals.
We may have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals, universities, and other
organizations. We can be held liable for the corrupt or other illegal activities of our employees, agents, contractors and other collaborators and partners,
even if we do not explicitly authorize or have actual knowledge of such activities. Any violations of the laws and regulations described above may result in
substantial civil and criminal fines and penalties, imprisonment, the loss of export or

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import privileges, debarment, tax reassessments, breach of contract and fraud litigation, reputational harm, and other adverse consequences.

Furthermore, U.S. export control laws and economic sanctions prohibit the provision of certain products and services to countries, governments,

and persons targeted by U.S. sanctions.

The  effect  of  pandemics,  epidemics,  outbreaks  of  infectious  diseases,  or  similar  public  health  crises  on  our  operations  and  the  operations  of  our
customers, suppliers, third-party partners, and regulators could have an adverse impact our business.

Pandemics, epidemics, outbreaks of infectious diseases, or similar public health crises could adversely disrupt or impact our operations or those of
our customers, suppliers, third-party partners, and regulators. In response to a pandemic or public health crisis, authorities may impose, and businesses and
individuals may implement, numerous measures to try to contain the pandemic or public health crisis or treat its impact, such as travel bans and restrictions,
quarantines, shelter-in-place/stay-at-home and social distancing orders, shutdowns, and vaccine requirements. In the event that such measures or similar
measures  or  restrictions  are  implemented  as  a  result  of  a  pandemic  or  public  health  crisis,  our  employees  conducting  research  and  development  or
manufacturing activities may not be able to access our laboratory or manufacturing spaces, and our core activities may be significantly limited or curtailed,
possibly for an extended period of time. In addition, the operations of our customers, suppliers, third-party partners, and regulators could be significantly
limited or curtailed. Timely initiation and completion of clinical trials are essential to our business and clinical trials are dependent upon the availability of
clinical  trial  sites,  researchers  and  investigators,  regulatory  agency  personnel,  and  materials,  any  of  which  may  be  adversely  affected  by  public  health
crises, such as pandemics. The extent to which a health crisis may impact our business, results of operations and future growth prospects will depend on a
variety of factors and future developments, which are highly uncertain and cannot be predicted with confidence, including the duration, scope, and severity
of the public health crisis. A future public health crisis may have a material adverse effect on our business and results of operations.

Inadequate  funding  for  the  FDA  and  other  government  agencies,  including  from  government  shut  downs,  or  other  disruptions  to  these  agencies’
operations, could hinder their ability to hire and retain key leadership and other personnel, prevent new products and services from being developed or
commercialized  in  a  timely  manner  or  otherwise  prevent  those  agencies  from  performing  normal  business  functions  on  which  the  operation  of  our
business may rely, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding
levels, ability to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory and policy changes. Disruptions at the FDA
and other agencies may also slow the time necessary for new product candidates to be reviewed and/or approved by necessary government agencies, which
could adversely affect our business. For example, when the U.S. government has shut down in the past, certain regulatory agencies, such as the FDA and
the  United  States  Securities  and  Exchange  Commission,  or  the  SEC,  have  had  to  furlough  critical  employees  and  stop  critical  activities.  If  a  prolonged
government shutdown occurs, it could significantly impact the ability of the FDA to review and process our regulatory submissions in a timely manner,
which could have a material adverse effect on our business. Further, future government shutdowns could impact our ability to access the public markets and
obtain  necessary  capital.  In  addition,  government  funding  of  government  agencies  on  which  our  operations  may  rely  is  subject  to  the  political  process,
which is inherently fluid and unpredictable.

Risks Related to the Development, Regulatory Review and Approval of Our Product Candidates

If  we  are  unable  to  advance  our  product  candidates  through  clinical  trials,  obtain  regulatory  approval  and  ultimately  commercialize  our  product
candidates, or if we experience significant delays in doing so, our business will be materially harmed.

The development and commercialization of our product candidates are subject to many uncertainties, including the following:

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successful enrollment and completion of clinical trials;

positive results from our current and planned clinical trials;

receipt of regulatory approvals from applicable regulatory authorities;

successful development of our internal manufacturing processes on an ongoing basis and maintenance of our existing arrangements with third-
party suppliers or manufacturers for clinical supply;

commercial launch of our product candidates, if and when approved, whether alone or in collaboration with others; and

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acceptance of our product candidates, if and when approved, by patients, the medical community and third-party payors.

If  we  fail  in  one  or  more  of  these  factors  in  a  timely  manner  or  at  all,  we  could  experience  significant  delays  or  an  inability  to  successfully
commercialize our product candidates, which would materially harm our business. If we do not receive regulatory approvals for our product candidates, our
business, financial condition, results of operations and prospects could be materially and adversely affected.

Our gene therapy platform is based on a novel technology, which makes it difficult to predict the time and cost of obtaining regulatory approvals for
our product candidates.

The clinical trial requirements of the FDA, EMA and other regulatory authorities and the criteria these regulators use to determine the safety and
efficacy of a product candidate vary substantially according to the type, complexity, novelty and intended use and market of such product candidates. The
regulatory  approval  process  for  novel  product  candidates  such  as  ours  can  be  more  expensive  and  take  longer  than  for  other,  better  known  or  more
extensively studied product candidates. It is difficult to determine how long it will take or how much it will cost to obtain regulatory approvals for our
product candidates in the United States, the European Union, or elsewhere, or how long it will take to commercialize our product candidates. Approvals by
the European Commission may not be indicative of what the FDA may require for approval and approval by the FDA may not be indicative of what the
European Commission would require for approval.

Regulatory requirements and policy governing gene and cell therapy products have changed frequently and may continue to change in the future.
In  2016,  the  FDA  established  the  Office  of  Tissues  and  Advanced  Therapies  (“OTAT”)  within  its  Center  for  Biologics  Evaluation  and  Research  to
consolidate  the  review  of  gene  therapy  and  related  products,  and  has  established  the  Cellular,  Tissue  and  Gene  Therapies  Advisory  Committee,  among
others, to advise this review. In September 2022, the FDA announced retitling of OTAT to the Office of Therapeutic Products (“OTP”) and elevation of
OTP to a “Super Office” to meet its growing cell and gene therapy workload. If we engage a National Institutes of Health funded institution to conduct a
clinical  trial,  that  institution’s  Institutional  Biosafety  Committee  as  well  as  its  Institutional  Review  Board  (“IRB”),  would  need  to  review  the  proposed
clinical trial to assess the safety of the trial. Similarly, the EMA may issue new guidelines concerning the development and marketing authorization for
gene therapy medicinal products and require that we comply with these new guidelines.

These regulatory review committees and advisory groups and the new guidelines they promulgate may lengthen the regulatory review process,
require  us  to  perform  additional  studies,  increase  our  development  costs,  lead  to  changes  in  regulatory  positions  and  interpretations,  delay  or  prevent
approval and commercialization of our product candidates or lead to significant post-approval limitations or restrictions. These additional processes may
result in a review and approval process that are longer than we otherwise would have expected. Delay or failure to obtain, or unexpected costs in obtaining,
the regulatory approval necessary to bring a potential product to market could decrease our ability to generate sufficient product revenue, and our business,
financial condition, results of operations and prospects would be materially and adversely affected.

Our product or product candidates may cause undesirable side effects or have other properties that could delay or prevent their regulatory approval,
limit the commercial potential, or result in significant negative consequences before or following any potential marketing approval.

There have been several significant adverse side effects in gene therapy trials using other vectors in the past. Gene therapy is still a relatively new
approach  to  disease  treatment  and  additional  adverse  side  effects  could  develop.  There  also  is  the  potential  risk  of  delayed  adverse  events  following
exposure  to  gene  therapy  products  due  to  persistent  biologic  activity  of  the  genetic  material  or  other  components  of  products  used  to  carry  the  genetic
material.

In addition to side effects caused by our product candidates, the administration process or related procedures also can cause adverse side effects. If
any such adverse events occur, our clinical trials could be suspended or terminated. If in the future we are unable to demonstrate that such adverse events
were caused by the administration process or related procedures and not by our product candidates, the FDA, the European Commission, the EMA, or other
regulatory authorities could order us to cease further development of, or deny approval of, our product candidates for any or all targeted indications. Even if
we  can  demonstrate  that  any  serious  adverse  events  are  not  product-related,  such  occurrences  could  affect  patient  recruitment  or  the  ability  of  enrolled
patients  to  complete  the  trial.  Moreover,  if  we  elect,  or  are  required,  to  delay,  suspend  or  terminate  any  clinical  trial  of  our  product  candidates,  the
commercial prospects of such product candidates may be harmed and our ability to generate product revenue from the product candidates may be delayed
or eliminated. Any of these occurrences may harm our ability to develop product candidates, and may harm our business, financial condition, and prospects
significantly.

Additionally, if a product candidate receives marketing approval, the FDA could require us to adopt a post-approval safety monitoring program to
ensure that the benefits outweigh its risks, which may include, among other things, a medication guide outlining the risks of the product for distribution to
patients and a communication plan to health care practitioners.

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Furthermore, if we or others later identify undesirable side effects caused by VYJUVEK or our product candidates, several potentially significant negative
consequences could result, including:

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regulatory authorities may suspend or withdraw approvals of such product;

regulatory authorities may require additional warnings on the label;

• we may be required to change the way VYJUVEK or a product candidate is administered or conduct additional clinical trials;

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

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our reputation may suffer.

Any  of  these  events  could  prevent  us  from  achieving  or  maintaining  market  acceptance  of  VYJUVEK  or  our  product  candidates  and  could

significantly harm our business, financial condition, results of operations and prospects.

We may encounter substantial delays in our clinical trials, or we may fail to demonstrate safety and efficacy to the satisfaction of applicable regulatory
authorities.

Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must conduct extensive clinical trials to
demonstrate the safety and efficacy of the product candidate for its intended indications. Obtaining marketing approval is an extensive, lengthy, expensive,
and  inherently  uncertain  process,  and  regulatory  authorities  may  delay,  limit,  or  deny  approval  of  our  product  candidates  for  many  reasons.  We  cannot
guarantee that any clinical trials will be conducted as planned or completed on schedule, if at all. A failure of one or more clinical trials can occur at any
stage of testing. Events that may prevent successful or timely completion of clinical development include:

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delays in reaching a consensus with regulatory authorities on trial design;

delays in opening sites and recruiting a sufficient number and diversity of suitable patients to participate in our clinical trials;

imposition of a clinical hold by regulatory authorities as a result of a serious adverse event or concerns with a class of product candidates, or after
an inspection of our clinical trial operations or trial sites;

delays in having patients complete participation in a trial or return for post-treatment follow-up;

occurrence of serious adverse events associated with the product candidate that are viewed to outweigh its potential benefits; or

changes in regulatory requirements and guidance that require amending or submitting new clinical protocols.

The  results  of  nonclinical  and  preclinical  studies  and  early  clinical  trials  may  not  be  predictive  of  the  results  of  later-stage  clinical  trials,  and
interim results of a clinical trial do not necessarily predict final results. In some instances, there can be significant variability in safety or efficacy results
between  different  clinical  trials  of  the  same  product  candidate  due  to  numerous  factors,  including  changes  in  trial  procedures  set  forth  in  protocols,
differences in the size and type of the patient populations, changes in and adherence to the dosing regimen and other clinical trial protocols and the rate of
dropout among clinical trial participants. In addition, preclinical and clinical data are often susceptible to various interpretations and analyses, and many
companies that have believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain
marketing approval. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy profile despite having progressed
through nonclinical studies and initial clinical trials.

If we make manufacturing or formulation changes to our product or product candidates, we may need to conduct additional studies to bridge our
modified product or product candidate to earlier versions. Clinical trial delays could also shorten any periods during which we may have the exclusive right
to commercialize our products or allow our competitors to bring products to market before we do, which could limit our potential revenue or impair our
ability  to  successfully  commercialize  our  products  and  may  harm  our  business,  financial  condition,  results  of  operations  and  prospects.  Any  delays,
setbacks or failures in our clinical trials could materially and adversely affect our business, financial condition, results of operations and prospects.

Additionally,  if  the  results  of  our  clinical  trials  are  inconclusive  or  if  there  are  safety  concerns  or  serious  adverse  events  associated  with  our

product candidates, we may:

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be delayed in obtaining marketing approval, if at all, or be required to conduct additional confirmatory safety and/or efficacy studies;

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

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

obtain approval without labeling claims that are necessary or desirable for the successful commercialization of our product candidates;

be subject to additional and costly post-marketing testing requirements or clinical trials;

be required to perform additional clinical trials to support approval;

have regulatory authorities withdraw, or suspend, their approval of the product or impose restrictions on its distribution;

be subject to the addition of labeling statements, such as warnings, precautions, or contraindications;

be sued; or

experience damage to our reputation.

Our product development costs will also increase if we experience delays in testing or obtaining marketing approvals. We do not know whether

any of our preclinical studies or clinical trials will begin as planned, need to be restructured or be completed on schedule, if at all.

Further, we, the FDA or an IRB, may suspend our clinical trials at any time if it appears that we or our collaborators are failing to conduct a trial in
accordance with regulatory requirements, including the FDA’s Current Good Clinical Practice, or CGCP, regulations, that we are exposing participants to
unacceptable health risks, or if the FDA finds deficiencies in our Investigational New Drug, or IND, applications or the conduct of these trials. Therefore,
we  cannot  predict  with  any  certainty  the  schedule  for  commencement  and  completion  of  future  clinical  trials.  If  we  experience  delays  in  the
commencement  or  completion  of  our  clinical  trials,  or  if  we  terminate  a  clinical  trial  prior  to  completion,  the  commercial  prospects  of  our  product
candidates could be negatively impacted, and our ability to generate revenue from our product candidates may be eliminated or delayed.

We rely on third parties to conduct certain aspects of our preclinical studies and clinical trials. If these third parties do not successfully carry out their
contractual  duties,  meet  expected  deadlines  or  comply  with  regulatory  requirements,  we  may  not  be  able  to  obtain  regulatory  approval  for,  or
commercialize, our product candidates.

We depend upon third parties to conduct certain aspects of our preclinical studies and depend on third parties, including independent principal
investigators, to conduct our clinical trials under agreements with universities, medical institutions, and others. We negotiate budgets and contracts with
such third parties, which may result in delays to our development timelines and increased costs.

We rely on third parties over the course of our clinical trials, and, as a result, may have limited control over the clinical principal investigators and
limited  visibility  into  their  day-to-day  activities,  including  with  respect  to  their  compliance  with  the  approved  clinical  protocol.  Nevertheless,  we  are
responsible  for  ensuring  that  each  of  our  clinical  trials  is  conducted  in  accordance  with  the  applicable  protocol,  legal  and  regulatory  requirements  and
scientific standards, and our reliance on third parties does not relieve us of our regulatory responsibilities. We and these third parties are required to comply
with CGCP requirements, which are regulations and guidelines enforced by the FDA and comparable foreign regulatory authorities for product candidates
in  clinical  development.  Regulatory  authorities  enforce  these  CGCP  requirements  through  periodic  inspections  of  clinical  trial  sponsors,  clinical
investigators, and clinical trial sites. If we or any of these third parties fail to comply with applicable CGCP requirements, the clinical data generated in our
clinical trials may be deemed unreliable and the FDA or comparable foreign regulatory authorities may require us to suspend or terminate these clinical
trials or perform additional preclinical studies or clinical trials before approving our marketing applications. We cannot be certain that, upon inspection,
such regulatory authorities will determine that any of our clinical trials comply with CGCP requirements. In addition, our later-stage clinical trials must be
conducted with product produced under CGMP requirements and may require a large number of patients.

Our failure or any failure by these third parties to comply with these regulations may require us to repeat clinical trials, which would delay the
regulatory approval process. Moreover, our business may be adversely affected if any of these third parties violates federal or state fraud and abuse or false
claims laws and regulations or healthcare privacy and security laws.

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Any  third  parties  conducting  aspects  of  our  preclinical  studies,  or  our  clinical  trials  will  not  be  our  employees  and,  except  for  remedies  that  may  be
available to us under our agreements with such third parties, we cannot control whether or not they devote sufficient time and resources to our preclinical
studies and clinical programs. These third parties may also have relationships with other commercial entities, including our competitors, for whom they
may also be conducting clinical trials or other product development activities, which could affect their performance on our behalf. If these third parties do
not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the
preclinical or clinical data they obtain is compromised due to the failure to adhere to our protocols or regulatory requirements or for other reasons, our
development  timelines,  including  clinical  development  timelines,  may  be  extended,  delayed  or  terminated,  and  we  may  not  be  able  to  complete
development of, obtain regulatory approval of, or successfully commercialize our product candidates. As a result, our financial results and the commercial
prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenue could be delayed or precluded entirely.
Though we carefully manage our relationships with principal investigators and other third parties, there can be no assurance that we will not encounter
challenges or delays or that these delays or challenges will not have a material adverse impact on our business, financial condition, and prospects.

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 or as additional analyses are conducted, and as the data are subject to audit and verification procedures that could result in material
changes in the final data.

From time to time, we may publish interim, “top-line” or preliminary data from our clinical trials. Interim data from clinical trials that we may
complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data
becomes available. Preliminary or “top-line” data also remain subject to audit and verification procedures that may result in the final data being materially
different from the preliminary data we previously published. As a result, interim and preliminary data should be viewed with caution until the final data are
available.  Material  adverse  changes  between  preliminary,  “top-line”  or  interim  data  and  final  data  could  significantly  harm  our  business,  financial
condition, results of operations and prospects.

Even  if  we  obtain  and  maintain  approval  for  our  product  candidates  from  the  FDA,  we  may  never  obtain  approval  for  them  outside  of  the  United
States, which would limit our market opportunities and adversely affect our business.

Approval of a product candidate in the United States by the FDA does not ensure approval of such product candidate by regulatory authorities in
other  countries  or  jurisdictions,  and  approval  by  one  foreign  regulatory  authority  does  not  ensure  approval  by  regulatory  authorities  in  other  foreign
countries or by the FDA. Sales of VYJUVEK or our product candidates, if approved, outside of the United States will be subject to foreign regulatory
requirements governing clinical trials and marketing approval. Even if the FDA grants marketing approval for a product candidate, comparable regulatory
authorities  of  foreign  countries  also  must  approve  the  manufacturing  and  marketing  of  the  product  candidate  in  those  countries  and  the  process  for
obtaining such approval may be lengthy and expensive. Approval procedures vary among jurisdictions and can involve requirements and administrative
review periods different from, and more onerous than, those in the United States, including additional preclinical studies or clinical trials. In many countries
outside the United States, a product candidate must be approved for reimbursement before it can be approved for sale in that country. In some cases, the
price  that  we  intend  to  charge  for  our  product  candidates,  if  approved,  is  also  subject  to  approval.  Obtaining  a  Marketing  Authorization  Application
(“MAA”) from the European Commission following the opinion of the EMA is a lengthy and expensive process. Even if a product candidate is approved,
the FDA or the European Commission, as the case may be, may limit the indications for which the product may be marketed, require extensive warnings on
the  product  labeling  or  require  expensive  and  time-consuming  additional  clinical  trials  or  reporting  as  conditions  of  approval.  Regulatory  authorities  in
countries outside of the United States and the European Union also have requirements for approval of product candidates with which we must comply prior
to  marketing  in  those  countries.  Obtaining  foreign  regulatory  approvals  and  compliance  with  foreign  regulatory  requirements  could  result  in  significant
delays, difficulties, and costs for us and could delay or prevent the introduction of our product candidates in certain countries.

Further, clinical trials conducted in one country may not be accepted by regulatory authorities in other countries. Also, regulatory approval for any
of our product candidates may be withdrawn. If we fail to comply with the regulatory requirements, our target market will be reduced and our ability to
realize the full market potential of our product candidates will be harmed and our business, financial condition, results of operations and prospects will be
adversely affected.

VYJUVEK and our product candidates remain subject to regulatory oversight even after regulatory approval. We will continue to incur costs related to
regulatory  compliance  and  are  subject  to  risks  related  to  non-compliance  with  or  changes  to  applicable  laws  and  regulations,  which  could  cause
VYJUVEK or any of our product candidates that obtain regulatory approval to lose that approval.

VYJUVEK, our first FDA-approved product, and any other product candidates that obtain regulatory approval in the future, will remain subject to

ongoing regulatory requirements for manufacturing, labeling, packaging, storage, advertising,

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promotion, sampling, record-keeping and submission of safety and other post-market information. Any regulatory approvals that we receive for our product
candidates may also be subject to a post-approval safety monitoring program, limitations on the approved indicated uses for which the product may be
marketed  or  to  the  conditions  of  approval,  or  contain  requirements  for  potentially  costly  post-marketing  testing,  including  Phase  4  clinical  trials,  and
surveillance to monitor the quality, safety, and efficacy of the product. For example, the holder of an approved BLA is obligated to monitor and report
adverse events and any failure of a product to meet the specifications in the BLA. The holder of an approved BLA also must submit new or supplemental
applications and obtain FDA approval for certain changes to the approved product, product labeling or manufacturing process. Advertising and promotional
materials must comply with FDA rules and are subject to FDA review, in addition to other potentially applicable federal and state laws.

In addition, product manufacturers and their facilities are subject to payment of user fees and continual review and periodic inspections by the
FDA  and  other  regulatory  authorities  for  compliance  with  CGMP  requirements  and  adherence  to  commitments  made  in  the  BLA  or  foreign  marketing
application.  If  we,  or  a  regulatory  authority,  discover  previously  unknown  problems  with  an  approved  product,  such  as  adverse  events  of  unanticipated
severity or frequency, or problems with the facility where the product is manufactured or a regulatory authority disagrees with the promotion, marketing or
labeling of that product, a regulatory authority may impose restrictions relative to that product, the manufacturing facility or us, including requiring recall
or withdrawal of the product from the market or suspension of manufacturing.

If we fail to comply with applicable regulatory requirements, a regulatory authority may:

issue a warning letter asserting that we are in violation of the law;

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

suspend or withdraw regulatory approval;

suspend any ongoing clinical trials;

refuse  to  approve  a  pending  BLA  or  comparable  foreign  marketing  application  (or  any  supplements  thereto)  submitted  by  us  or  our  strategic
partners, if any;

restrict the marketing or manufacturing of the product;

seize or detain the product or otherwise require the withdrawal of the product from the market;

refuse to permit the import or export of product candidates; or

refuse to allow us to enter into government contracts.

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Any  government  investigation  of  alleged  violations  of  law  could  require  us  to  expend  significant  time  and  resources  in  response  and  could
generate negative publicity. The occurrence of any event or penalty described above may inhibit our ability to commercialize our approved product and
product candidates and adversely affect our business, financial condition, results of operations and prospects.

The FDA’s policies, and those of equivalent foreign regulatory agencies, may change and additional government regulations may be enacted that
could  negatively  impact  the  existing  marketing  approval  for  VYJUVEK  and  prevent,  limit,  or  delay  regulatory  approval  of  our  product  candidates.  We
cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative 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  lose  any  marketing  approval  that  we  may  have  obtained,  which  would  materially  and  adversely  affect  our
business, financial condition, results of operations and prospects.

While we have obtained orphan drug exclusivity for VYJUVEK and orphan drug designation for KB105, KB407, and KB408, it may not effectively
protect  us  from  competition,  and  we  may  be  unable  to  obtain  orphan  drug  designation  for  other  product  candidates.  If  our  competitors  are  able  to
obtain  orphan  drug  exclusivity  before  us,  we  may  not  be  able  to  have  competing  products  approved  by  the  applicable  regulatory  authority  for  a
significant period of time.

Regulatory authorities in some jurisdictions, including the United States, the European Union, and Japan may designate drugs for relatively small

patient populations as orphan drugs.

Under the Orphan Drug Act of 1983, as amended, the FDA may designate a product candidate as an orphan drug if it is intended to treat a rare
disease  or  condition,  which  is  generally  defined  as  having  a  patient  population  of  fewer  than  200,000  individuals  in  the  United  States,  or  a  patient
population greater than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug will be recovered from
sales  in  the  United  States.  Orphan  drug  designation  does  not  convey  any  advantage  in  or  shorten  the  duration  of  the  regulatory  review  and  approval
process, but it can lead to financial

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incentives, such as opportunities for grant funding toward clinical trial costs, tax advantages and user-fee waivers. In addition, if a product that has orphan
designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the drug is entitled to orphan drug
marketing exclusivity for a period of seven years. Orphan drug marketing exclusivity generally prevents the FDA from approving another application to
market  the  same  drug  or  biological  product  for  the  same  disease  or  condition  for  seven  years,  except  in  limited  circumstances,  including  if  the  FDA
concludes that the later drug is safer, more effective or makes a major contribution to patient care. A designated orphan drug may not receive orphan drug
marketing  exclusivity  if  it  is  approved  for  a  use  that  is  broader  than  the  indication  for  which  it  received  orphan  designation.  Orphan  drug  marketing
exclusivity  rights  in  the  United  States  may  be  lost  if  the  FDA  later  determines  that  the  request  for  designation  was  materially  defective  or  if  the
manufacturer is unable to assure sufficient quantity of the drug to meet the needs of patients with the rare disease or condition.

In the European Union, the European Commission, upon a recommendation from the EMA’s Committee for Orphan Medicinal Products, grants
orphan  drug  designation  to  promote  the  development  of  products  that  are  intended  for  the  diagnosis,  prevention,  or  treatment  of  a  life-threatening  or
chronically debilitating condition affecting not more than 5 in 10,000 persons in the EU. Additionally, orphan designation is granted for products intended
for the diagnosis, prevention, or treatment of a life-threatening, seriously debilitating, or serious and chronic condition and when, without incentives, it is
unlikely that sales of the drug in the European Union would be sufficient to justify the necessary investment in developing the drug or biologic product. In
the  European  Union,  orphan  medicinal  product  designation  does  not  convey  any  advantage  in,  or  shorten  the  duration  of,  the  regulatory  review  and
approval process, but orphan drug designation may entitle an applicant to financial incentives such as reduction of fees or fee waivers, protocol assistance,
and  access  to  the  centralized  marketing  authorization  procedure.  Upon  grant  of  a  marketing  authorization,  orphan  products  are  entitled  to  ten  years  of
market  exclusivity  for  the  approved  therapeutic  indication,  which  means  that  the  EMA  and  European  Commission  cannot  accept  another  marketing
authorization application, grant a marketing authorization, or accept an application to extend a marketing authorization for a similar product for the same
indication for a period of ten years. The period of market exclusivity is extended by two years for orphan medicinal products that have also complied with
an agreed Pediatric Investigation Plan, or PIP. The ten-year market exclusivity in the European Union may be reduced to six years if, at the end of the fifth
year, it is established that the product no longer meets the criteria for which it received orphan designation, including where it is shown that the product is
sufficiently  profitable  not  to  justify  maintenance  of  market  exclusivity,  or  where  the  prevalence  of  the  condition  has  increased  above  the  threshold.
Additionally granting of an authorization for another similar orphan medicinal product where another product has market exclusivity can happen at any
time:  (i)  the  second  applicant  can  establish  that  its  product,  although  similar,  is  safer,  more  effective,  or  otherwise  clinically  superior;  (ii)  the  applicant
cannot supply enough orphan medicinal product, or (iii) where the applicant consents to a second orphan medicinal product application.

The  orphan  drug  designation  system  in  Japan  aims  to  support  the  development  of  drugs  for  diseases  that  affect  fewer  than  50,000  patients  in
Japan, for which significant unmet medical need exists. An investigational therapy is eligible to qualify for orphan drug designation in Japan if there is no
approved alternative treatment option or if there is high efficacy or safety compared to existing treatment options expected. Specific measures to support
the  development  of  orphan  drugs  in  Japan  include  subsidies  for  research  and  development  expenditures,  prioritized  consultation  regarding  clinical
development, reduced consultation fees, tax incentives, priority review of applications, reduced application fees, and extended registration validity period.
Up to 10 years of orphan exclusivity, known as the re-examination period, is granted for the product after approval. The orphan drug exclusivity may be
rescinded by the Japanese government in certain circumstances.

Even  though  we  have  obtained  orphan  drug  exclusivity  for  VYJUVEK  in  the  United  States;  orphan  drug  designation  for  VYJUVEK  in  the
European Union and Japan; orphan drug designation for KB105 and KB407 in the United States and the European Union; and orphan drug designation for
KB408 in the United States, we cannot assure you that we will be able to obtain or maintain orphan drug exclusivity and if we are able to maintain the
orphan drug exclusivity, the exclusivity may not effectively protect the product from competition because different drugs can be approved for the same
condition. Further, we cannot assure you that any of our other product candidates will be approved for any orphan-designated use in any jurisdiction, in a
timely manner or at all, or that a competitor will not obtain orphan drug exclusivity that could block the regulatory approval of any of our drug candidates
for several years. If we are unable to maintain or obtain orphan drug exclusivity, our ability to generate sufficient revenue may be negatively affected. If a
competitor is able to obtain orphan drug exclusivity that would block our product candidates’ regulatory approval, our ability to generate revenue could be
significantly reduced, which would harm our business prospects, financial condition and results of operations. We do not know if, when, or how the FDA
or  other  regulators  may  change  the  applicable  orphan  drug  regulations  and  policies  in  the  future,  and  it  is  uncertain  how  any  changes  might  affect  our
business. Depending on what changes may be made to orphan drug regulations and policies, our business could be adversely impacted.

Accelerated  approval  by  the  FDA,  even  if  granted  for  any  of  our  product  candidates,  may  not  lead  to  a  faster  development  or  regulatory  review  or
approval process and it does not increase the likelihood that our product candidates will receive marketing approval.

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We may seek approval of our current or future product candidates using the FDA’s accelerated approval pathway. This pathway may not lead to a
faster development, regulatory review or approval process and does not increase the likelihood that our product candidates will receive marketing approval.
A  product  may  be  eligible  for  accelerated  approval  if  it  treats  a  serious  or  life-threatening  condition,  generally  provides  a  meaningful  advantage  over
available therapies, and demonstrates an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit. As a condition of approval, the
FDA may require that a sponsor of a product receiving accelerated approval perform adequate and well-controlled post-marketing confirmatory clinical
trials. These confirmatory trials must be completed with due diligence. Under the Food and Drug Omnibus Reform Act of 2022, or FDORA, the FDA is
permitted to require, as appropriate, that a post-approval confirmatory trial or trials be underway prior to approval or within a specified time after the date
accelerated  approval  was  granted.  FDORA  also  requires  sponsors  to  send  updates  to  the  FDA  every  180  days  on  the  status  of  such  studies,  including
progress toward enrollment targets, and the FDA must promptly post this information publicly. Furthermore, under FDORA, the FDA is empowered to take
action, such as issuing fines, against companies that fail to conduct with due diligence any post-approval confirmatory trial or submit timely reports to the
agency on their progress. In addition, for products under consideration for accelerated approval, the FDA currently requires, unless otherwise requested by
the  agency,  pre-approval  of  promotional  materials  intended  for  dissemination  or  publication  within  120  days  of  marketing  approval  be  submitted  to  the
agency for review during the review period, which could adversely impact the timing of the commercial launch of the product. There can be no assurance
that the FDA would allow any of our product candidates to proceed on an accelerated approval pathway, and even if the FDA did allow such pathway, there
can be no assurance that any expedited development, review, or approval will be granted on a timely basis, or at all.

Breakthrough Therapy Designation, Fast Track Designation, Regenerative Medicine Advanced Therapy Designation or Priority Review by the FDA, or
PRIME Scheme by the EMA, even if granted for any of our product candidates, may not lead to a faster development, regulatory review or approval
process, and such designations may not increase the likelihood that any of our product candidates will receive marketing approval.

We  may  seek  a  Breakthrough  Therapy  Designation  for  some  of  our  product  candidates.  A  breakthrough  therapy  is  defined  as  a  therapy  that  is
intended,  alone  or  in  combination  with  one  or  more  other  therapies,  to  treat  a  serious  or  life-threatening  disease  or  condition,  and  preliminary  clinical
evidence indicates that the therapy may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such
as substantial treatment effects observed early in clinical development. For therapies that have been designated as breakthrough therapies, interaction and
communication between the FDA and the sponsor of the trial can help to identify the most efficient path for clinical development while minimizing the
number of patients placed in ineffective control regimens. Therapies designated as breakthrough therapies by the FDA may also be eligible for priority
review and accelerated approval. Designation as a breakthrough therapy is within the discretion of the FDA. Accordingly, even if we believe one of our
product candidates meets the criteria for designation as a breakthrough therapy, the FDA may disagree and instead determine not to make such designation.
In any event, the receipt of a Breakthrough Therapy Designation for a product candidate may not result in a faster development process, review or approval
compared to therapies considered for approval under conventional FDA procedures and does not assure ultimate approval by the FDA. In addition, even if
one  or  more  of  our  product  candidates  qualify  as  breakthrough  therapies,  the  FDA  may  later  decide  that  such  product  candidates  no  longer  meet  the
conditions for qualification or decide that the time for FDA review or approval will not be shortened.

We have obtained and may seek Fast Track Designation for some of our product candidates. For instance, VYJUVEK, KB105, and KB707 were
granted  Fast  Track  Designation  by  the  FDA.  If  a  therapy  is  intended  for  the  treatment  of  a  serious  or  life-threatening  condition  and  the  therapy
demonstrates  the  potential  to  address  unmet  medical  needs  for  this  condition,  the  sponsor  may  apply  for  Fast  Track  Designation.  The  FDA  has  broad
discretion whether or not to grant this designation, so even if we believe a particular product candidate is eligible for this designation, we cannot assure you
that  the  FDA  would  decide  to  grant  it.  Even  if  we  do  receive  Fast  Track  Designation,  we  may  not  experience  a  faster  development  process,  review  or
approval compared to conventional FDA procedures. For products that receive Fast Track Designation, sponsors may have greater interactions with the
FDA and the FDA may initiate review of sections of the marketing application before the application is complete. This rolling review may be available if
the FDA determines, after preliminary evaluation of clinical data submitted by the sponsor, that a Fast Track product may be effective. The sponsor must
also  provide,  and  the  FDA  must  approve,  a  schedule  for  the  submission  of  the  remaining  information  and  the  sponsor  must  pay  applicable  user  fees.
However,  the  FDA's  time  period  goal  for  reviewing  an  application  does  not  begin  until  the  last  section  of  the  application  is  submitted.  The  FDA  may
withdraw  Fast  Track  Designation  if  it  believes  that  the  designation  is  no  longer  supported  by  data  from  clinical  programs.  Many  biologics  that  have
received  Fast  Track  Designation  have  failed  to  obtain  marketing  approval.  Fast  Track  Designation  alone  does  not  guarantee  qualification  for  the  FDA’s
priority review procedures.

We  have  obtained  and  may  seek  Regenerative  Medicine  Advanced  Therapy,  or  RMAT,  designation  for  some  of  our  product  candidates.  For
instance, VYJUVEK was granted RMAT designation by the FDA. In 2017, the FDA established the RMAT designation as part of its implementation of the
21st  Century  Cures  Act  to  expedite  review  of  any  drug  that  meets  the  following  criteria:  it  qualifies  as  a  RMAT,  which  is  defined  as  a  cell  therapy,
therapeutic tissue engineering product, human cell

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and tissue product, or any combination product using such therapies or products, with limited exceptions; it is intended to treat, modify, reverse, or cure a
serious or life-threatening disease or condition; and preliminary clinical evidence indicates that the drug has the potential to address unmet medical needs
for  such  a  disease  or  condition.  Like  Breakthrough  Therapy  Designation,  RMAT  designation  provides  potential  benefits  that  include  more  frequent
meetings with the FDA to discuss the development plan for the product candidate, and eligibility for rolling review and priority review. Products granted
RMAT designation may also be eligible for accelerated approval on the basis of a surrogate or intermediate endpoint reasonably likely to predict long-term
clinical  benefit,  or  reliance  upon  data  obtained  from  a  meaningful  number  of  sites,  including  through  expansion  to  additional  sites.  RMAT-designated
products that receive accelerated approval may, as appropriate, fulfill their post-approval requirements through the submission of clinical evidence, clinical
trials, patient registries, or other sources of real-world evidence, such as electronic health records; through the collection of larger confirmatory data sets; or
via post-approval monitoring of all patients treated with such therapy prior to approval of the therapy. There is no assurance that we will be able to obtain
RMAT designation for our product candidates. RMAT designation does not change the FDA’s standards for product approval, and there is no assurance that
such  designation  will  result  in  expedited  review  or  approval  or  that  the  approved  indication  will  not  be  narrower  than  the  indication  covered  by  the
designation. Additionally, RMAT designation can be revoked if the criteria for eligibility cease to be met as clinical data emerges.

If the FDA determines that a product candidate offers a treatment for a serious condition and, if approved, the product would provide a significant
improvement in safety or effectiveness, the FDA may designate the product candidate for priority review. A priority review designation means that the goal
for the FDA to review an application is six months, rather than the standard review period of ten months. The FDA has broad discretion with respect to
whether or not to grant priority review status to a product candidate, so even if we believe a particular product candidate is eligible for such designation or
status,  the  FDA  may  decide  not  to  grant  it.  Moreover,  a  priority  review  designation  does  not  necessarily  result  in  an  expedited  regulatory  review  or
approval process or necessarily confer any advantage with respect to approval compared to conventional FDA procedures. Receiving priority review from
the FDA does not guarantee approval within the six-month review cycle, or at all.

We have obtained and may seek to qualify our product candidates under the PRIority MEdicines (“PRIME”) scheme from the EMA. For instance,
VYJUVEK was granted PRIME designation. The PRIME scheme is open to medicines under development and for which the applicant intends to apply for
an  initial  MAA  through  the  centralized  procedure.  Eligible  products  must  target  conditions  for  which  where  is  an  unmet  medical  need  (there  is  no
satisfactory method of diagnosis, prevention or treatment in the European Union or, if there is, the new medicine will bring a major therapeutic advantage)
and they must demonstrate the potential to address the unmet medical need by introducing new methods or therapy or improving existing ones. There is no
assurance that we will be able to obtain PRIME qualification for our product candidates. PRIME does not change the standards for product approval, and
there is no assurance that such qualification will result in expedited review or approval. Moreover, where, during the course of development, a product no
longer meets the eligibility criteria, support under the PRIME scheme may be withdrawn.

We have obtained a rare pediatric disease designation for certain of our product candidates; however, there is no guarantee that FDA approval

will result in issuance of a priority review voucher.

In 2012, Congress authorized the FDA to award priority review vouchers to sponsors of certain rare pediatric disease product applications. This
program  is  designed  to  encourage  development  of  new  drug  and  biological  products  for  prevention  and  treatment  of  certain  rare  pediatric  diseases.
Specifically, under this program, a sponsor that receives an approval for a drug or biologic for a “rare pediatric disease” that meets certain criteria may
qualify for a voucher that can be redeemed to receive a priority review of a subsequent marketing application for a different product. The sponsor of a rare
pediatric disease drug product receiving a priority review voucher may transfer (including by sale) the voucher to another sponsor. The voucher may be
further transferred any number of times before the voucher is used, as long as the sponsor making the transfer has not yet submitted the application. The
FDA may also revoke any priority review voucher if the rare pediatric disease drug for which the voucher was awarded is not marketed in the United States
within one year following the date of approval. We received rare pediatric disease designation for VYJUVEK and were awarded a priority review voucher
following FDA approval of VYJUVEK in May 2023. The priority review voucher was sold in August 2023. We have also obtained a rare pediatric disease
designation for KB105, KB104, and for KB407. However, there is no guarantee that we will be able to obtain a priority review voucher if these product
candidates  are  approved  by  the  FDA.  Congress  included  a  sunset  provision  in  the  statute  authorizing  the  rare  pediatric  disease  priority  review  voucher
program.  Under  the  current  statutory  sunset  provisions,  after  September  30,  2024,  the  FDA  may  only  award  a  voucher  for  an  approved  rare  pediatric
disease product application if the sponsor has rare pediatric disease designation for the product candidate, and that designation was granted by September
30, 2024. After September 30, 2026, the FDA may not award any rare pediatric disease priority review vouchers.

We may seek designation for our platform technology as a designated platform technology, but we might not receive such designation, and even if we
do, such designation may not lead to a faster development or regulatory review or approval process.

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We may seek designation for our platform technology as a designated platform technology. Under the Food and Drug Omnibus Reform Act of
2022,  or  FDORA,  a  platform  technology  incorporated  within  or  utilized  by  a  drug  or  biologic  is  eligible  for  designation  as  a  designated  platform
technology  if  (1)  the  platform  technology  is  incorporated  in,  or  utilized  by,  a  product  approved  under  a  New  Drug  Application,  or  NDA,  or  BLA;  (2)
preliminary evidence submitted by the sponsor of the approved product, or a sponsor that has been granted a right of reference to data submitted in the
application  for  such  product,  demonstrates  that  the  platform  technology  has  the  potential  to  be  incorporated  in,  or  utilized  by,  more  than  one  product
without  an  adverse  effect  on  quality,  manufacturing,  or  safety;  and  (3)  data  or  information  submitted  by  the  sponsor  indicates  that  incorporation  or
utilization of the platform technology has a reasonable likelihood to bring significant efficiencies to the product development or manufacturing process and
to the review process. A sponsor may request the FDA to designate a platform technology as a designated platform technology concurrently with, or at any
time  after,  submission  of  an  IND  application  for  a  product  that  incorporates  or  utilizes  the  platform  technology  that  is  the  subject  of  the  request.  If  so
designated,  the  FDA  may  expedite  the  development  and  review  of  any  subsequent  NDA  or  BLA  for  a  product  that  uses  or  incorporates  the  platform
technology. Even if we believe our platform technology meets the criteria for such designation, the FDA may disagree and instead determine not to grant
such  designation.  In  addition,  the  receipt  of  such  designation  for  a  platform  technology  does  not  ensure  that  our  applicable  product  candidates  will  be
developed  more  quickly  or  receive  a  faster  FDA  review  process  or  ultimate  FDA  approval.  Moreover,  the  FDA  may  revoke  a  designation  if  the  FDA
determines that a designated platform technology no longer meets the criteria for such designation.

Risks Related to Manufacturing

Delays  in  obtaining  regulatory  approvals  of  the  process  and  facilities  needed  to  manufacture  our  product  candidates  or  disruptions  in  our
manufacturing process may disrupt our production of VYJUVEK or delay or disrupt our development and commercialization efforts with respect to our
product candidates.

Before we can begin to commercially manufacture our product candidates, we must pass a pre-approval inspection of our manufacturing facilities
by the FDA. A manufacturing authorization must also be obtained from the appropriate EU regulatory authorities. The timeframe required for us to obtain
such approvals is uncertain. To obtain approval, we need to ensure that all our processes, methods and equipment are compliant with CGMP, and perform
extensive audits of vendors, contract laboratories, and suppliers. If any of our vendors, contract laboratories, or suppliers is found to be out of compliance
with CGMP, we may experience delays or disruptions in manufacturing while we work with these third parties to remedy the violation or while we work to
identify suitable replacement vendors, contract laboratories, or suppliers. The CGMP requirements govern quality control of the manufacturing process and
documentation policies and procedures. In complying with CGMP, we are obligated to expend time, money and effort in production, record keeping and
quality control to assure that the product meets applicable specifications and other requirements. If we fail to comply with these requirements, we will be
subject to possible regulatory action and may not be permitted to sell any approved product that we may develop.

In  addition,  the  manufacturing  process  used  to  produce  VYJUVEK  and  our  product  candidates  is  complex  and  novel.  The  production  of
VYJUVEK and our product candidates require processing steps that are more complex than those required for most chemical pharmaceuticals. Moreover,
unlike chemical pharmaceuticals, the physical and chemical properties of a biologic such as ours generally cannot be fully characterized. As a result, assays
of the finished product may not be sufficient to ensure that the product will perform in the intended manner. Accordingly, we employ multiple steps to
control our manufacturing process to assure that the process works and that VYJUVEK and our product candidates are made strictly and consistently in
compliance with the process. Problems with the manufacturing process, even minor deviations from the normal process, could result in product defects or
manufacturing failures that result in lot failures, product recalls, product liability claims or insufficient inventory. We may encounter problems achieving
adequate quantities and quality of materials that meet FDA, EMA or other applicable standards or specifications with consistent and acceptable production
yields and costs.

Although we have established our own manufacturing facilities for VYJUVEK and our product candidates, we may also utilize third parties to conduct
our product manufacturing or components thereof. Therefore, we are subject to the risk that these third parties may not perform satisfactorily.

We may maintain third-party manufacturing capabilities in order to provide multiple sources of supply of VYJUVEK or a product candidate that is
approved for sale. In addition, we may utilize third parties to manufacture components of our products. For example, we use a third-party to manufacture
the  sterile  gel  that  is  mixed  with  our  in-house  produced  vector  for  VYJUVEK.  Our  ability  to  commercially  supply  VYJUVEK  depends,  in  part,  on  the
ability of third parties to supply and manufacture the raw materials and other important components related to our manufacture of VYJUVEK. If we fail to
develop and maintain supply relationships with these third parties, we may be unable to successfully commercialize VYJUVEK or any approved product
candidate. Any of our existing suppliers may:

•

fail to supply us on a timely basis or in the requested amount due to unexpected damage to or destruction of facilities or equipment or otherwise;

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•

•

•

•

•

•

fail  to  increase  manufacturing  capacity  and  at  higher  yields  in  a  timely  or  cost-effective  manner,  or  at  all,  to  sufficiently  meet  our  commercial
needs;

be unable to meet our production demands due to issues related to their reliance on sole-source suppliers and manufacturers;

supply us with materials that fail to meet regulatory requirements;

become unavailable through business interruption or financial insolvency;

lose regulatory status as an approved supply source;

be unable or unwilling to (i) honor current supply agreements or (ii) renew current supply agreements when such agreements expire on a timely
basis, on acceptable terms or at all; or

discontinue production or manufacturing of materials that we acquire through such third-party supplier.

In the event of any of the foregoing, if we do not have an alternative supplier or manufacturer in place, we may not be able to manufacture our
products for commercial, regulatory, or clinical purposes and would be required to expend substantial management time and expense to identify, qualify
and transfer to alternative suppliers or manufacturers. There can be no assurance that replacements would be available to us on a timely basis, on acceptable
terms, or at all. Any need to find and qualify new suppliers or manufacturers could significantly delay production of VYJUVEK or any product candidate,
if approved, adversely impact our ability to market VYJUVEK or any product candidate, if approved, and have a material adverse effect on our business,
financial condition, results of operations and prospects.

If we or a third-party supplier or manufacturer fails to comply with applicable CGMP regulations, the FDA and foreign regulatory authorities can
impose  regulatory  sanctions  including,  among  other  things,  refusal  to  approve  a  pending  application  for  a  new  product  candidate  or  suspension  or
revocation of a pre-existing approval. Such an occurrence may cause our business, financial condition, results of operations and prospects to be materially
harmed.

Any contamination in our manufacturing process, shortages of raw materials or failure of any of our key suppliers to deliver necessary components
could result in delays in our ability to produce VYJUVEK for commercial supply or any product candidate for clinical development.

Given the nature of biologics manufacturing, there is a risk of contamination. Any contamination could materially adversely affect our ability to

produce VYJUVEK or our product candidates on schedule and could, therefore, harm our results of operations and cause reputational damage.

Some of the raw materials required in our manufacturing process are derived from biologic sources. Such raw materials are difficult to procure and
may  be  subject  to  contamination  or  recall.  A  material  shortage,  contamination,  recall  or  restriction  on  the  use  of  biologically  derived  substances  in  the
manufacture  of  VYJUVEK  or  our  product  candidates  could  adversely  impact  or  disrupt  the  commercial  manufacturing  or  the  production  of  clinical
material, which could materially and adversely affect our development timelines and our business, financial condition, results of operations and prospects.

Our  failure  to  maintain  or  continuously  improve  our  quality  management  program  could  have  an  adverse  effect  upon  our  business,  subject  us  to
regulatory actions and cause patients to lose confidence in us or our products, among other negative consequences.

Quality  management  plays  an  essential  role  in  the  manufacturing  of  drugs  or  drug  products,  conducting  clinical  trials,  preventing  defects,
improving  our  product  candidates,  and  assuring  the  safety  and  efficacy  of  our  product  and  product  candidates.  We  seek  to  maintain  a  robust  quality
management program which includes the following broad pillars of quality:

• monitoring and assuring regulatory compliance for clinical trials, manufacturing, and testing of good applicable practice (“GxP”) (e.g., CGCP and

CGMP regulated) products;

• monitoring and providing oversight of all GxP suppliers;

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establishing  and  maintaining  an  integrated,  robust  quality  management  system  for  clinical,  manufacturing,  supply  chain  and  distribution
operations; and

cultivating a proactive, preventative quality culture and employee and supplier training to ensure quality.

Our success depends on our ability to maintain and continuously improve our quality management program. A quality or safety issue may result in
adverse inspection reports, warning letters, monetary sanctions, injunctions to halt manufacture and distribution of our products, civil or criminal sanctions,
costly  litigation,  refusal  of  a  government  to  grant  approvals  and  licenses,  restrictions  on  operations,  or  withdrawal,  suspension  or  variation  of  existing
approvals and licenses. An inability to address a quality or safety issue in an effective and timely manner may also cause negative publicity, or a loss of
patient

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confidence in us or our product or product candidates, which may result in difficulty in successfully launching products and the loss of potential future
sales, which could have an adverse effect on our business, financial condition, and results of operations.

Risks Related to Commercialization of VYJUVEK and Our Product Candidates

We have limited experience as a commercial company and the sales, marketing, and distribution of VYJUVEK or any future approved products may be
unsuccessful or less successful than anticipated.

We received FDA approval of VYJUVEK in May 2023 and initiated a commercial launch of VYJUVEK in the United States in the second quarter
of 2023. As a company, we have no prior experience commercializing a biologic. The success of our commercialization efforts is difficult to predict and
subject  to  the  effective  execution  of  our  business  plan,  including,  among  other  things,  the  continued  development  of  our  internal  sales,  marketing,  and
distribution capabilities and our ability to navigate the significant expenses and risks involved with the development and management of such capabilities.
For example, our commercial launch of VYJUVEK may not develop as planned or anticipated, which may require us to, among others, adjust or amend our
business plan and incur significant expenses. Further, given our lack of experience commercializing products, we do not have a track record of successfully
executing a commercial launch. If we are unsuccessful in accomplishing our objectives and executing on our business plan, or if our commercialization
efforts  do  not  develop  as  planned,  we  may  not  be  able  to  successfully  commercialize  VYJUVEK  and  any  future  approved  products,  we  may  require
significant additional capital and financial resources, we may not become profitable on a consistent basis, and we may not be able to compete against more
established companies in our industry.

If we are unable to maintain our agreements with third parties to distribute VYJUVEK to patients in the United States, our results of operations and
business could be adversely affected.

We rely on a small number of third parties to commercially distribute VYJUVEK to patients in the United States. We have contracted with a third-
party  packaging  company  to  package  VYJUVEK,  a  third-party  logistics  company  to  warehouse, process,  and  ship  VYJUVEK  to  a  limited  number  of
specialty pharmacies that mix the medication and administer it to patients in the patient’s home by a healthcare professional and a specialty distributor that
distributes  VYJUVEK  to  hospitals  and  outpatient  clinics  where  patients  are  administered  the  medication  at  a  healthcare  professional’s  office.  This
distribution network requires significant coordination with our sales and marketing and finance organizations. In addition, failure to coordinate financial
systems could negatively impact our ability to accurately report product revenue from VYJUVEK. If we are unable to effectively manage the distribution
process, the sales of VYJUVEK could be compromised and our results of operations may be harmed.

If the third parties involved in the commercial distribution of VYJUVEK in the United States do not fulfill their contractual obligations to us or
refuse or fail to adequately or to properly distribute VYJUVEK and serve patients, or the agreements with them are terminated without adequate notice,
shipments of VYJUVEK, and associated revenue, could be adversely affected. In addition, if we were required to replace such third-parties, it could take
time to locate an appropriate replacement third-party on acceptable terms, which could cause delays in our distribution network and increased expenses,
and thereby adversely impact our commercial sales of VYJUVEK in the United States and result in a material adverse effect on our business, financial
condition, results of operations, and prospects.

We plan on using local distributors to market and sell VYJUVEK in certain jurisdictions outside of the U.S., the U.K., certain EU countries, and Japan,
which subjects us to certain risks.

We  plan  on  using  local  distributors  to  market  and  sell  VYJUVEK  outside  of  the  U.S.,  the  U.K.,  certain  EU  countries,  and  Japan.  We  may  be
unable to enter into appropriate supply, marketing, and distribution arrangements on favorable terms, if at all. Our use of distributors in these market to
market and sell VYJUVEK involves certain risks, including, but not limited to, risks that these organizations will not comply with applicable laws and
regulations,  not  effectively  sell  or  support  VYJUVEK  or  reduce  or  discontinue  their  efforts  to  sell  or  support  VYJUVEK,  not  devote  the  resources
necessary to market and sell VYJUVEK in the volumes and within the time frame we expect, not be able to satisfy financial obligations to us or others, not
provide  us  with  accurate  or  timely  information  regarding  their  inventories  of  VYJUVEK  or  the  number  of  patients  who  are  using  VYJUVEK,  or  not
provide  us  with  accurate  or  timely  information  regarding  serious  adverse  events  and/or  product  complaints.  Any  such  events  may  result  in  regulatory
actions that may include suspension or termination of the distribution and sale of our products in a certain country, loss of revenue, and/or reputational
damage, which could harm our results of operations and business.

In connection with the commercial launch of VYJUVEK in the United States, we recruited a sales force and established marketing, market access and
medical  affairs  teams  and  distribution  capabilities  and  if  the  commercial  launch  of  VYJUVEK  is  not  successful  for  any  reason,  we  could  incur
substantial costs and our investment would be lost if we cannot retain or reposition our sales, marketing, market access and medical affairs personnel.

To achieve commercial success for VYJUVEK, we have devoted and anticipate that we will continue to devote significant resources to support

our sales force, marketing, market access, and medical affairs teams and distribution

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capabilities. There are risks involved with establishing our own sales, marketing, distribution, training, and support capabilities. For example, recruiting
and training sales and marketing personnel is expensive and time-consuming and could delay our ability to focus on other priorities. If the commercial
launch of VYJUVEK in the United States is not successful for any reason, this would be costly, and our investment would be lost if we cannot retain or
reposition our sales, marketing, market access and medical affairs personnel or terminate on favorable terms any agreements entered into with third parties
to support our commercialization efforts.

Factors that may inhibit our efforts to commercialize VYJUVEK or any other product candidates, if approved, on our own in the United States or

elsewhere include:

•

•

•

•

our inability to train and retain adequate numbers of effective sales, marketing, training, and support personnel;

the inability of sales personnel to obtain access to physicians, including key opinion leaders, or to educate an adequate number of physicians of the
benefits of VYJUVEK or any approved product candidate;

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

unforeseen costs and expenses associated with establishing and maintaining an independent sales, marketing, training, and support organization.

If our salesforce, marketing, market access, and medical affairs teams and distribution capabilities fail, or are otherwise unsuccessful, it would

materially adversely impact the commercial launch of VYJUVEK, impact our ability to generate revenue and harm our business.

If we are unable to expand our medical affairs, marketing, market access, sales, and distribution capabilities or collaborate with third parties to market
and sell our product candidates for which we obtain marketing approval, we may be unable to generate sufficient product revenue.

To successfully commercialize any products for which we obtain marketing approvals, we will need to expand our salesforce, marketing, market
access,  and  medical  affairs  teams  and  distribution  capabilities,  either  on  our  own  or  in  collaboration  with  others.  The  development  of  a  salesforce,
marketing, market access, and medical affairs teams and distribution capabilities effort is expensive and time-consuming, and our expenses associated with
maintaining our sales force may be disproportional compared to the revenue we may be able to generate on sales of VYJUVEK and future products. We
cannot  be  certain  that  we  will  be  able  to  internally  develop  this  capability  successfully.  We  may  enter  into  collaborations  regarding  VYJUVEK  or  any
future approved product candidates with other entities to utilize their established marketing and distribution capabilities. However, we may be unable to
enter into such agreements on favorable terms, if at all.

We  compete  with  many  companies  that  currently  have  extensive,  experienced,  and  well-funded  medical  affairs,  marketing,  market  access,
distribution, and sales operations to recruit, hire, train and retain personnel, and we may not be able to hire or retain such talent on commercially reasonable
terms, if at all. We also face competition in our search for third parties to assist us with the sales and marketing efforts. If any future collaborators do not
commit sufficient resources to commercialize our product candidates, if approved, or we are unable to develop the necessary capabilities on our own, we
will be unable to generate sufficient product revenue to sustain our business.

Our efforts to educate the medical community and third-party payors on the benefits of VYJUVEK or our product candidates, if approved, may
require significant resources and may never be successful. Such efforts may require more resources than are typically required due to the complexity and
uniqueness  of  our  products.  If  VYJUVEK  or  any  of  our  product  candidates  that  are  approved  fails  to  achieve  market  acceptance  among  physicians,
patients, or third-party payors, we will not be able to generate significant revenue from such product, which could have a material adverse effect on our
business, financial condition, results of operations and prospects.

If  the  market  opportunities  for  VYJUVEK  or  our  product  candidates  are  smaller  than  we  believe  they  are,  our  product  revenue  may  be  adversely
impacted, and our business may suffer.

We  focus  our  research  and  product  development  on  genetic  medicines  for  patients  with  debilitating  diseases.  We  base  our  market  opportunity
estimates on a variety of factors, including our estimates of the number of people who have these diseases, the potential scope of our approved product
labels, the subset of people with these diseases who have the potential to benefit from treatment with VYJUVEK or our product candidates, various pricing
scenarios,  and  our  understanding  of  reimbursement  policies  in  particular  countries.  These  estimates  are  based  on  many  assumptions  and  may  prove
incorrect,  and  new  studies  may  reduce  the  estimated  incidence  or  prevalence  of  these  diseases.  Estimating  market  opportunities  can  be  particularly
challenging for rare indications, such as the ones we currently address, as epidemiological data is often more limited than for more prevalent indications
and can require additional assumptions to assess potential patient populations. For example, as we commercialize VYJUVEK in the United States and learn
more  about  market  dynamics  and  engage  with  regulators  on  additional  potential  marketing  approvals,  our  view  of  VYJUVEK’s  initial  potential  market
opportunity will

52

become more refined. The addressable patient population in the United States and internationally may turn out to be lower than expected, patients may not
be otherwise amenable to treatment with VYJUVEK or our product candidates, if approved, or may become increasingly difficult to identify and access, all
of  which  would  adversely  affect  our  business,  financial  condition,  results  of  operations  and  prospects.  If  we  are  unable  to  successfully  commercialize
VYJUVEK  or  any  future  product  candidates  with  attractive  market  opportunities,  our  future  product  revenue  may  be  smaller  than  anticipated,  and  our
business may suffer.

Further, there are several factors that could contribute to making the actual number of patients who receive VYJUVEK less than the potentially
addressable market. These include the lack of widespread availability of, and limited reimbursement for, new therapies in many underdeveloped markets.
Further, the severity of the progression of a disease up to the time of treatment will likely diminish the therapeutic benefit conferred by a gene therapy due
to irreversible cell damage. Lastly, certain patients’ immune systems might prohibit the successful delivery of certain gene therapy products to the target
tissue, thereby limiting the treatment outcomes.

The commercial success of VYJUVEK and our product candidates will depend upon their degree of market acceptance by physicians, patients, third-
party payors, and others in the medical community.

Even with the requisite approvals from the FDA in the United States, potential approvals of VYJUVEK from the EMA in the European Union and
other regulatory authorities internationally (and potential approvals of any of our product candidates by regulatory authorities), the commercial success of
VYJUVEK and our product candidates will depend, in part, on the acceptance of physicians, patients and health care payors of gene therapy products in
general, and VYJUVEK and our product candidates, in particular, as medically necessary, cost-effective, and safe. VYJUVEK and any product candidate
that we commercialize may not gain acceptance by physicians, patients, health care payors and others in the medical community. If these products do not
achieve an adequate level of acceptance, we may not generate significant product revenue and may not become profitable. The degree of market acceptance
of gene therapy products and VYJUVEK and our product candidates, if approved for commercial sale, will depend on several factors, including:

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

the potential and perceived advantages of VYJUVEK and our product candidates over alternative treatments, if available;

the cost of VYJUVEK and our product candidates relative to alternative treatments if any are available;

the clinical indications for which VYJUVEK and our product candidates are approved by the FDA and other regulatory authorities;

the willingness of physicians to prescribe new therapies;

the willingness of the target patient population to try new therapies;

the prevalence and severity of any side effects;

product  labeling  or  product  insert  requirements  of  the  FDA,  the  EMA,  or  other  regulatory  authorities,  including  any  limitations  or  warnings
contained in a product’s approved labeling;

relative convenience and ease of administration;

the strength of marketing and distribution support;

the timing of market introduction of competitive products;

the availability of products and their ability to meet market demand;

publicity concerning VYJUVEK and our product candidates or competing products and treatments;

any restrictions on the use of VYJUVEK and our products together with other medications; and

favorable third-party payor coverage and adequate reimbursement.

Even  if  a  product  candidate  displays  a  favorable  efficacy  and  safety  profile  in  preclinical  studies  and  clinical  trials,  market  acceptance  of  the

product will not be fully known until after it is launched.

Government price controls or other changes in pricing regulation could restrict the amount that we are able to charge for VYJUVEK and our product
candidates, if approved, which would adversely affect our revenue and results of operations.

We expect that coverage and reimbursement of pharmaceuticals may be increasingly restricted both in the United States and internationally. The
escalating cost of health care has led to increased pressure on the health care industry to reduce costs. Drug pricing by pharmaceutical companies recently
has  come  under  increased  scrutiny  and  continues  to  be  subject  to  intense  political  and  public  debate  in  the  United  States  and  abroad.  Government  and
private third-party payors have proposed

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health care reforms and cost reductions. A number of federal and state proposals to control the cost of health care, including the cost of drug treatments,
have been made in the United States. Specifically, there have been several recent U.S. Congressional inquiries and proposed bills designed to, among other
things,  bring  more  transparency  to  drug  pricing,  review  the  relationship  between  pricing  and  manufacturer  patient  programs  and  reform  government
program reimbursement methodologies for drugs. In some international markets, the government controls the pricing, which can affect the profitability of
drugs. Current government regulations and possible future legislation regarding health care may affect coverage and reimbursement for medical treatment
by  third-party  payors,  which  may  render  VYJUVEK  or  our  product  candidates,  if  approved,  not  commercially  viable  or  may  adversely  affect  our
anticipated future revenue and gross margins.

We  cannot  predict  the  extent  to  which  our  business  may  be  affected  by  these  or  other  potential  future  legislative  or  regulatory  developments.
However,  future  price  controls  or  other  changes  in  pricing  regulation  or  negative  publicity  related  to  the  pricing  of  drugs  or  biologics  generally  could
restrict the amount that we are able to charge for VYJUVEK or our product candidates, if approved, which would adversely affect our anticipated revenue
and results of operations.

The  insurance  coverage  and  reimbursement  status  of  newly  approved  products  is  uncertain.  Failure  to  obtain  or  maintain  adequate  coverage  and
reimbursement  for  VYJUVEK  or  our  product  candidates,  if  approved,  could  limit  our  ability  to  market  those  products  and  decrease  our  ability  to
generate product revenue.

We expect that coverage and reimbursement by government and private payors will be essential for most patients to be able to afford our approved
products. Accordingly, sales of VYJUVEK and our product candidates, if approved, will depend substantially, both domestically and abroad, on the extent
to  which  the  costs  of  our  product  or  product  candidates  will  be  paid  by  health  maintenance,  managed  care,  pharmacy  benefit  and  similar  healthcare
management organizations, or will be reimbursed by government authorities, private health coverage insurers and other third-party payors. Coverage and
reimbursement by a third-party payor may depend upon several factors, including the third-party payor’s determination that use of a product is:

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a covered benefit under its health plan;

safe, effective, and medically necessary;

appropriate for the specific patient;

cost-effective; and

neither experimental nor investigational.

Obtaining  coverage  and  reimbursement  for  a  product  from  third-party  payors  is  a  time-consuming  and  costly  process  that  could  require  us  to
provide to the payor supporting scientific, clinical and cost-effectiveness data. We may not be able to provide data sufficient to gain acceptance with respect
to coverage and reimbursement. If coverage and reimbursement are not available, or are available only at limited levels, we may not be able to successfully
commercialize  our  product  candidates,  if  approved.  Even  if  coverage  is  provided,  the  coverage  may  be  more  limited  than  the  purposes  for  which  the
product is approved by the FDA or comparable foreign regulatory authorities. Moreover, eligibility for coverage and reimbursement does not imply that a
product  will  be  paid  for  in  all  cases  or  at  a  rate  that  covers  our  costs,  including  research,  development,  intellectual  property,  manufacture,  sale,  and
distribution expenses, and therefore, the approved reimbursement amount may not be adequate to realize a sufficient return on our investment.

There is significant uncertainty related to third-party coverage and reimbursement of newly approved drug products. In the United States, third-
party payors, including government 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 and reimbursed. The Medicare and Medicaid programs increasingly are used as models for how private payors and
government  payors  develop  their  coverage  and  reimbursement  policies.  It  is  difficult  to  predict  what  CMS  will  decide  with  respect  to  coverage  and
reimbursement  for  fundamentally  novel  products  such  as  ours,  as  there  is  no  body  of  established  practices  and  precedents  for  these  types  of  products.
Moreover, reimbursement agencies in the European Union may be more conservative than CMS. For example, several cancer drugs have been approved for
reimbursement in the United States and have not been approved for reimbursement in certain European Union Member States. It is difficult to predict what
third-party payors will decide with respect to the coverage and reimbursement for our product candidates.

Outside the United States, international operations generally are subject to extensive government price controls and other market regulations and
increasing  emphasis  on  cost-containment  initiatives  in  the  European  Union  and  other  countries  may  put  pricing  pressure  on  us.  In  many  countries,  the
prices of medical products are subject to varying price control mechanisms as part of national health systems. It also can take a significant amount of time
after  approval  of  a  product  to  secure  pricing  and  reimbursement  for  such  product  in  many  counties  outside  the  United  States.  In  general,  the  prices  of
medicines  under  such  systems  are  substantially  lower  than  in  the  United  States.  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

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regulation  could  restrict  the  amount  that  we  are  able  to  charge  for  our  product  candidates.  Accordingly,  in  markets  outside  the  United  States,  the
reimbursement for our approved products may be reduced compared with the United States and may be insufficient to generate commercially reasonable
product revenue.

Moreover, increasing efforts by government 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  new  products  approved  and,  as  a  result,  they  may  not  cover  or  provide
adequate payment for our product candidates. Payors increasingly are considering new metrics as the basis for reimbursement rates, such as Average Sales
Price, Average Manufacturer Price, and Actual Acquisition Cost. The existing data for reimbursement based on some of these metrics is relatively limited,
although certain states have begun to survey acquisition cost data for the purpose of setting Medicaid reimbursement rates, and CMS has begun making
pharmacy National Average Drug Acquisition Cost and National Average Retail Price data publicly available on at least a monthly basis. Therefore, it may
be  difficult  to  project  the  impact  of  these  evolving  reimbursement  metrics  on  the  willingness  of  payors  to  cover  product  candidates  that  we  are  able  to
commercialize. We expect to experience pricing pressures in connection with the sale of any of our product candidates due to the trend toward managed
healthcare, the increasing influence of health maintenance organizations, additional legislative changes, statements by elected officials, and administrative
changes. The downward pressure on healthcare costs in general, particularly prescription drugs and surgical procedures and other treatments, has become
intense. As a result, increasingly high barriers are being erected to the entry of new products such as ours.

Ethical, legal, and social issues related to genetic testing may reduce demand for our product candidates, if approved.

Prior to receiving VYJUVEK, patients are required to undergo genetic testing, and we anticipate that prior to receiving certain of our other product
candidates, if approved, patients may be required to undergo genetic testing. Genetic testing has raised concerns regarding the appropriate utilization and
the  confidentiality  of  information  provided  by  genetic  testing.  Genetic  tests  for  assessing  a  person’s  likelihood  of  developing  a  chronic  disease  have
focused public attention on the need to protect the privacy of genetic information. For example, concerns have been expressed that insurance carriers and
employers may use these tests to discriminate based on genetic information, resulting in barriers to the acceptance of genetic tests by consumers. Concerns
have also been raised about the accuracy of genetic testing. This could lead to governmental authorities restricting genetic testing or calling for additional
regulation of genetic testing, particularly for diseases for which there is no known cure. Any of these scenarios could decrease demand for VYJUVEK and
our product candidates, if approved.

Increasing  demand  for  compassionate  use  or  expanded  access  of  our  unapproved  therapies  could  negatively  affect  our  reputation  and  harm  our
business.

We are developing our product candidates for illnesses for which there are currently limited to no available therapeutic options. At least one other
company has been the target of disruptive social media campaigns related to a request for access to unapproved drugs for patients with significant unmet
medical need. If we experience a similar social media campaign regarding our decision to provide or not provide our product candidates under an expanded
access  corporate  policy,  our  reputation  may  be  negatively  affected,  and  our  business  may  be  harmed.  Recent  media  attention  to  individual  patients’
expanded access requests has resulted in the introduction of legislation at the local and national level referred to as “Right to Try” laws, such as the Right to
Try Act, which are intended to give patients access to unapproved therapies. New and emerging legislation regarding expanded access to unapproved drugs
for life-threatening illnesses could negatively impact our business in the future.

A possible consequence of both activism and legislation in this area is the need for us to initiate an unanticipated expanded access program or to
make our product candidates more widely available sooner than anticipated. We are a small company with limited resources and unanticipated trials or
access programs could result in diversion of resources from our primary goals.

In addition, some patients who receive access to unapproved drugs through compassionate use or expanded access programs have life-threatening
illnesses and have exhausted all other available therapies. The risk for serious adverse events in this patient population is high which could have a negative
impact on the safety profile of our product candidates if we were to provide them to these patients in accordance with our expanded access corporate policy,
which could cause significant delays or an inability to successfully commercialize our product candidates, which could materially harm our business. If we
were to provide patients with our product candidates under our expanded access corporate policy, we may in the future need to restructure or pause ongoing
compassionate  use  and/or  expanded  access  programs  in  order  to  perform  the  controlled  clinical  trials  required  for  regulatory  approval  and  successful
commercialization of our product candidates, which could prompt adverse publicity or other disruptions related to current or potential participants in such
programs.

Risks Related to Our Intellectual Property

If we are unable to obtain and maintain adequate United States and foreign patent protection for VYJUVEK, our current product candidates, and any
future product candidates we may develop, and/or our vector platform, or if the scope of the patent protection obtained is not sufficiently broad, our
competitors could develop and commercialize products and

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technologies similar or identical to ours, and our ability to successfully commercialize VYJUVEK, our current product candidates, any future product
candidates we may develop, and our platform technologies may be adversely affected.

Our success depends, in large part, on our ability to obtain and maintain patent protection in the United States and other countries with respect to
our approved product, current product candidates, additional product candidates in our pipeline and current and future innovations related to our vector
platform. The patent prosecution process is expensive, time-consuming, and complex; we may not be able to file, prosecute, maintain, and/or enforce all
necessary or desirable patent applications and issued patents at a reasonable cost or in a timely manner.

Even if we are granted the patents we are currently pursuing, they may not issue in a form that will provide us with the full scope of protection we
desire,  they  may  not  prevent  competitors  or  other  third  parties  from  competing  with  us,  and/or  they  may  not  otherwise  provide  us  with  a  competitive
advantage. Our competitors, or other third parties, may be able to circumvent our patents by developing similar or alternative technologies or products in a
non-infringing  manner.  Moreover,  our  patent  estate  does  not  preclude  third  parties  from  having  intellectual  property  rights  that  could  interfere  with  our
freedom to use our platform, including for our intended indications. Even assuming patents issue from our pending and future patent applications, changes
in either the patent laws or interpretation of the patent laws in the United States and foreign jurisdictions may diminish the value of our patents or narrow
their scope of protection.

We  also  may  not  be  aware  of  all  third-party  intellectual  property  rights  potentially  relating  to  technologies  similar  to  our  own.  Publications  of
discoveries in the scientific literature often lag their actual discoveries, and patent applications in the United States and other jurisdictions are typically not
published until 18 months after earliest priority date or, in some cases, not at all until patents are issued. Therefore, it is impossible to be certain that we
were the first to develop the specific technologies as claimed in any owned patents or pending patent applications, or that we were the first to file for patent
protection of such inventions.

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

Filing, prosecuting, and defending patents on VYJUVEK, each and every one of our product candidates, and current and future innovations related
to our vector platform, in all countries throughout the world would be prohibitively expensive, and intellectual property rights in some countries outside the
United States may differ in scope from those eventually granted in the United States. Thus, in some cases, we may not have the opportunity to obtain patent
protection for certain technologies in some jurisdictions outside 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 prevent third parties from practicing
our inventions in all countries outside the United States, even in jurisdictions where we do pursue patent protection. Competitors may use our technologies
in  jurisdictions  where  we  have  not  pursued  and  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
VYJUVEK and our product candidates that are approved, 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, trade secrets, and other intellectual property
protection, particularly those relating to biotechnology products. Such challenges in enforcing rights in these countries could make it difficult for us to stop
the infringement of our patents, if pursued and obtained, or marketing of competing products in violation of our proprietary rights generally. Proceedings to
enforce  our  current  and  future  patent  rights  in  foreign  jurisdictions  could  result  in  substantial  costs  and  may  divert  our  efforts  and  attention  from  other
aspects  of  our  business;  could  put  our  patents  at  risk  of  being  invalidated  or  interpreted  narrowly;  could  put  any  future  patent  applications,  including
continuation  and  divisional  applications,  at  risk  of  not  issuing;  and  could  provoke  third  parties  to  assert  claims  against  us.  We  may  not  prevail  in  any
lawsuits, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce any intellectual
property rights around the world stemming from intellectual property that we develop may be inadequate to obtain a significant commercial advantage in
these foreign jurisdictions.

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

Our  commercial  success  depends  upon  our  ability  (and  the  ability  of  any  potential  future  collaborators)  to  market  and  sell  VYJUVEK  and  to
develop, manufacture, market and sell our product candidates, and to freely use our proprietary technologies without infringing the rights and intellectual
property of others. Many companies and institutions have filed, and continue to file, patent applications related to various aspects of gene therapy. Because
patent applications can take many years to issue, may be confidential for 18 months or more after filing, and can be revised before issuance, there may be
applications now pending which may later result in issued patents that a third-party asserts are infringed by the manufacture, use, sale, or importation of
VYJUVEK or any of our product candidates, if approved. The biotechnology and pharmaceutical industries are

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characterized by extensive and complex litigation regarding patents and other intellectual property rights. We may become party to, or be threatened with,
adversarial  proceedings  or  litigation  regarding  intellectual  property  rights  with  respect  to  VYJUVEK  or  our  product  candidates  or  related  technologies,
including,  for  example,  interference  proceedings,  post  grant  review  challenges,  and  inter partes  review  before  The  United  States  Patent  and  Trademark
Office. Our competitors or other third parties may assert infringement claims against us, alleging that our products, manufacturing methods, formulations or
administration methods are covered by their patents. Moreover, we may face patent infringement claims from non-practicing entities that have no relevant
product revenue, and against whom our patent portfolio may therefore have no deterrent effect.

There  is  a  risk  that  third  parties  may  choose  to  engage  in  litigation  with  us  to  enforce  or  to  otherwise  assert  their  patents  or  other  intellectual
property rights against us. Even if we believe such claims are without merit, a court of competent jurisdiction could hold that these third-party patents are
valid, enforceable, and infringed, which could materially and adversely affect our ability to commercialize VYJUVEK or any of our product candidates, if
approved. In order to successfully challenge the validity of any such U.S. patent in federal court, we would need to overcome a presumption of validity. As
this burden is a high one requiring us to present clear and convincing evidence as to the invalidity of any such U.S. patent claim, there is no assurance that a
court of competent jurisdiction would invalidate the claims of any such U.S. patent. In such a hypothetical situation, there is no assurance that a court of
competent jurisdiction would find that our product, product candidates or technologies do not infringe a third-party patent.

Patent and other types of intellectual property litigation can involve complex factual and legal questions, and their outcomes are uncertain. If we
are found, or believe there is a risk that we may be found, to infringe a third-party’s valid and enforceable intellectual property rights, we could be required
(or may choose) to obtain a license from such a third-party to continue developing, manufacturing and marketing our approved product, product candidates
and technologies. However, we may not be able to obtain any required license on commercially reasonable terms, if at all. Even if we were able to obtain a
license, it could be non-exclusive, thereby giving our competitors and other third parties access to the same technologies licensed to us, and further, it could
require  us  to  make  substantial  licensing  and  royalty  payments.  We  could  be  forced,  including  by  court  order,  to  cease  developing,  manufacturing,  and
commercializing the infringing product or technologies. We also could be found liable for monetary damages, including treble damages and attorneys’ fees,
if we are found to have willfully infringed a patent or other intellectual property right. A finding of infringement could prevent us from manufacturing and
commercializing  our  products  and  technologies  or  force  us  to  cease  some  or  all  our  business  operations.  Claims  that  we  have  misappropriated  the
confidential information or trade secrets of third parties could have a similar negative impact on our business, financial condition, results of operations and
prospects.

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

Litigation or other legal proceedings relating to intellectual property claims, with or without merit, is unpredictable and generally expensive and
time  consuming.  Competitors  may  infringe  our  current  or  future  patents,  should  such  patents  issue,  or  we  may  be  required  to  defend  against  claims  of
infringement or other unauthorized use of intellectual property. 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 scientific and management personnel from their normal responsibilities.
Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our
confidential information could be compromised by disclosure during this type of litigation. In addition, there could be public announcements of the results
of hearings, motions, or other interim proceedings or developments, and if securities analysts or investors perceive these results to be negative, it could
have a substantial adverse effect on the price of our common stock. Such litigation or proceedings could substantially and adversely impact our financial
results and reduce the resources available for development activities or any future sales, marketing, or distribution activities.

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

We have been subject to claims asserting that we, our employees or our advisors have wrongfully used or disclosed alleged trade secrets of other parties,
and we may face such claims in the future or claims asserting ownership of what we regard as our own intellectual property.

Certain  of  our  employees  or  advisors  are  currently,  or  were  previously,  employed  at  universities  or  other  biotechnology  or  pharmaceutical
companies, including potential competitors, and we have and may in the future enter into agreements providing us with rights to intellectual property of
third  parties  for  limited  purposes.  Although  we  endeavor  to  observe  the  terms  of  agreements  under  which  we  obtain  access  to  third-party  intellectual
property and to ensure that our

57

employees  and  advisors  do  not  use  the  proprietary  information  or  know-how  of  others  in  their  work  for  us,  we  may  be  subject  to  claims  that  these
individuals, or we, have used or disclosed intellectual property, including trade secrets or other proprietary information, of third parties or the current or
former employers of employees or advisors. For instance, as described in Note 7 of the Notes to the Consolidated Financial Statements included in Part II,
Item 8 of this Annual Report on Form 10-K, in April of 2022, we entered into a settlement agreement with PeriphaGen, Inc., which had alleged breach of
contract  and  misappropriation  of  trade  secrets.  If  we  fail  to  successfully  defend  any  such  claims,  in  addition  to  paying  monetary  damages,  we  may  be
subject to an injunction and may lose valuable intellectual property rights or personnel. Moreover, any such litigation, or the threat thereof, may adversely
affect our ability to hire new employees or contract with independent contractors. A loss of key personnel or their work product could hamper or prevent
our ability to commercialize VYJUVEK or our product candidates, which could have an adverse effect on our business, results of operations, and financial
condition. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to management.

While  it  is  our  policy  to  require  our  employees  and  contractors  who  may  be  involved  in  the  conception  of  intellectual  property  to  execute
agreements assigning such intellectual property rights to us, unforeseen complications may arise when fully and adequately executing such an agreement
with each party who, in fact, conceives of intellectual property that we regard as our own. Examples of such complications may include, for example, when
we  obtain  agreements  assigning  intellectual  property  to  us,  the  assignment  of  intellectual  property  rights  may  not  be  self-executing,  or  the  assignment
agreements may be breached. Such complications may lead to us being forced to bring claims against third parties or current and former employees, or
defend claims that they may bring against us, to determine the ownership of what we regard as our intellectual property. Moreover, individuals executing
agreements with us may have preexisting or competing obligations to a third-party, such as an academic institution, and thus an agreement with us may be
insufficient  in  fully  perfecting  ownership  of  inventions  developed  by  that  individual.  Disputes  about  the  ownership  of  intellectual  property  may  have  a
material adverse effect on our business.

Changes  in  U.S.  patent  law  could  diminish  the  value  of  patents  in  general,  thereby  impairing  our  ability  to  protect  VYJUVEK  or  our  product
candidates.

Patent  reform  legislation  could  increase  the  uncertainties  and  costs  surrounding  the  prosecution  of  patent  applications  and  the  enforcement  or
defense  of  issued  patents.  For  example,  in  September  2011,  the  Leahy-Smith  America  Invents  Act,  or  the  Leahy-Smith  Act,  was  signed  into  law.  The
Leahy-Smith Act included several significant changes to U.S. patent law, including provisions that affected the way patent applications are prosecuted, and
altered strategies regarding patent litigation. These provisions also switched the United States from a “first-to-invent” system to a “first-to-file” system,
allowed  third-party  submissions  of  prior  art  to  the  United  States  Patent  and  Trademark  Office  (“USPTO”)  during  patent  prosecution,  and  set  forth
additional procedures to attack the validity of a patent through various post grant proceedings administered by the USPTO. As patent reform legislation can
inject serious uncertainty into the patent prosecution and litigation processes, it is not clear what impact future patent reform legislation will have on the
operation of our business. However, such future legislation, and its implementation, could increase the uncertainties and costs surrounding the prosecution
of our patent applications and the enforcement or defense of any issued patents, all of which could have a material adverse effect on our business, financial
condition, results of operations and prospects.

Moreover, the patent positions of companies engaged in the development and commercialization of biologics and pharmaceuticals are particularly
uncertain given the ever evolving and constantly shifting nature of precedential patent cases decided by both the U.S. Court of Appeals for the Federal
Circuit and the U.S. Supreme Court. We cannot assure you that our efforts to seek patent protection for our technology and product candidates will not be
negatively impacted by future court decisions or changes in guidance or procedures issued by the USPTO. These decisions, and any guidance issued by the
USPTO (or changes thereto), could have a material adverse effect on our existing patent portfolio and our ability to protect and enforce our intellectual
property rights in the future.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our
business may be adversely affected.

Although we have registered certain of our trademarks and trade names, they may be challenged, infringed, circumvented, or declared generic or
determined to be infringing on other marks. We may not be able to protect our rights to these trademarks and trade names, which are important for building
name recognition among potential partners or customers in our markets of interest. At times, competitors may adopt trade names or trademarks similar to
ours, thereby impeding our ability to build brand identity and possibly leading to market confusion. There also could be potential trade name or trademark
infringement  claims  brought  by  owners  of  other  registered  trademarks  or  trade  names  that  incorporate  variations  of  our  registered  or  unregistered
trademarks or trade names. Over the long term, if we are unable to establish name recognition based on our trademarks and trade names, then we may not
be  able  to  compete  effectively,  and  our  business  may  be  adversely  affected.  Our  efforts  to  enforce  or  protect  our  proprietary  rights  related  to  patents,
trademarks, trade secrets, domain names, copyrights or other intellectual property may be ineffective and could result in substantial costs and diversion of
resources and could adversely impact our financial condition or results of operations.

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Intellectual property rights and regulatory exclusivity rights do not necessarily address all potential threats.

The  degree  of  current  and  future  protection  afforded  by  our  intellectual  property  rights  is  uncertain  because  intellectual  property  rights  have

limitations and may not adequately protect our business or permit us to maintain our competitive advantage. For example:

•

others  may  be  able  to  make  gene  therapy  products  that  are  similar  to  our  approved  product  or  any  of  our  product  candidates  but  that  are  not
covered by the claims of our current patents, or of patents that we may own or license in the future;

• we,  or  any  future  license  partners  or  collaborators,  might  not  have  been  the  first  to  file  patent  applications  covering  certain  aspects  of  the

concerned technologies;

•

•

•

•

•

others may independently develop similar or alternative technologies, or duplicate any of our technologies, potentially without falling within the
scope of our current or future issued claims, thus not infringing our intellectual property rights;

it is possible that our filed or future patent applications will not lead to issued patents;

issued patents to which we currently hold rights or to which we may hold rights in the future may be held invalid or unenforceable, including as a
result of legal challenges by third parties or our competitors;

others may have access to any future intellectual property rights licensed to us on a non-exclusive basis;

our competitors might conduct research and development activities in countries where we do not have or pursue patent rights, and then use the
information learned from such activities to develop competitive products for sale in our major commercial markets;

• we may not develop additional proprietary technologies that are patentable;

•

the patents or other intellectual property rights of others may have an adverse effect on our business; and

• we may choose not to file a patent application covering certain of our trade secrets or know-how, and a third-party may subsequently file a patent

covering such intellectual property.

Should any of these events occur, they could significantly harm our business, financial condition, results of operations and prospects.

Risks Related to Our Financial Position and Need for Additional Capital

We have incurred net losses in the past and may not sustain profitability.

Although we generated net income for the year ended December 31, 2023, we have otherwise incurred recurring losses and negative cash flows
from operations since inception. Our transition to operating profitability depends on our ability to (i) successfully commercialize VYJUVEK in the U.S.
and obtain the necessary regulatory approvals to commercialize VYJUVEK outside of the U.S. and then successfully commercialize VYJUVEK outside
the U.S., and (ii) complete the development of, and obtain the regulatory approvals necessary to successfully commercialize our product candidates with
significant market potential. We have devoted substantially all our efforts to date to (i) research and development of our gene therapy platform, product
candidates and our manufacturing infrastructure, and, more recently, (ii) commercializing VYJUVEK in the U.S. We expect to continue to incur significant
expenses  for  the  foreseeable  future  and  our  operating  results  may  fluctuate  significantly  from  quarter  to  quarter.  We  anticipate  that  our  expenses  will
increase substantially if, and as, we:

• manufacture,  market  and  sell  our  lead  product,  VYJUVEK,  in  the  U.S.  and  prepare  for  regulatory  approvals  outside  of  the  U.S.  and  if  such

approvals are received, commercialize VYJUVEK in those geographies;

•

•

•

•

continue our research, preclinical studies, and the clinical development of our current product candidates, including our current clinical trials and
planned clinical trials;

initiate preclinical studies and clinical trials for any additional product candidates that we may pursue in the future;

prepare for regulatory approvals for our product candidates in the United States, EU and in other key geographies;

continue  to  operate  our  in-house  commercial-scale  current  good  manufacturing  practice,  or  CGMP,  manufacturing  facilities,  ANCORIS  and
ASTRA;

• manufacture material for commercial sales of VYJUVEK and clinical trials or potential commercial sales of our product candidates;

•

further develop our gene therapy platform;

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•

•

•

further establish our sales, marketing and distribution infrastructure to commercialize VYJUVEK and product candidates for which we may obtain
marketing approval;

develop, maintain, expand and protect our intellectual property portfolio; and

acquire or in-license other product candidates and technologies.

To remain profitable, we must be successful in a range of challenging activities, including designing, initiating, and completing clinical trials for
our product candidates, developing, validating, and maintaining commercial scale manufacturing processes, obtaining marketing approvals, manufacturing,
marketing,  and  selling  VYJUVEK  and  any  product  candidates  for  which  we  may  obtain  marketing  approval,  and  satisfying  any  post-marketing
requirements.  If  we  were  required  to  discontinue  development  of  any  of  our  product  candidates,  if  VYJUVEK  does  not  receive  regulatory  approvals
outside the U.S., or any of our product candidates do not receive regulatory approvals, or if VYJUVEK or any of our product candidates, if approved, fails
to  achieve  sufficient  market  acceptance  for  any  indication,  our  ability  to  remain  profitable,  our  business  prospects  and  financial  condition  could  be
materially adversely affected. Moreover, if we decide to leverage any success with VYJUVEK or any of our current product candidates to develop other
product opportunities, we may not be successful in such efforts. In any such event, our business may be materially adversely affected.

We currently have one product, VYJUVEK, approved by the FDA and several product candidates in the clinical trials stages. However, we may
never develop, acquire or in-license additional product candidates. We may never generate revenue from any of our product candidates. We may not be able
to  sustain  or  increase  profitability  on  a  quarterly  or  annual  basis.  Our  failure  to  remain  profitable  would  decrease  the  value  of  our  company  and  could
impair our ability to raise capital, maintain our research and development efforts, expand our business, or continue our operations. A decline in the value of
our company also could cause stockholders to lose all or part of their investment.

Because of the numerous risks and uncertainties associated with pharmaceutical product and biological development, we are unable to accurately
predict the timing or amount of increased expenses. If we are required by the FDA, the EMA, or other regulatory authorities to perform studies in addition
to those currently expected, or if there are any delays in completing our clinical trials or the development of our product candidates, our expenses could
increase and potential revenue from product candidates in development could be delayed.

We may need to raise additional funding to maintain and expand our commercialization capabilities for VYJUVEK and to complete the development
of, and obtain the regulatory approvals necessary to, commercialize our product candidates. Such funding may not be available on acceptable terms, or
at all. Failure to obtain this necessary capital when needed may force us to delay, limit or terminate certain of our product development efforts or other
operations.

To complete the process of obtaining regulatory approval for our product candidates and to continue building the manufacturing, sales, marketing,
and distribution infrastructure that we believe is or will be necessary to successfully commercialize VYJUVEK and commercialize our product candidates,
if approved, we may require substantial additional funding. We expect to continue to incur significant expenses related to sales, medical affairs, marketing,
manufacturing,  and  distribution  of  VYJUVEK.  In  addition,  if  we  obtain  marketing  approval  for  our  product  candidates,  we  expect  to  incur  significant
additional expenses related to product sales, medical affairs, marketing, manufacturing and distribution. We may need additional funding to complete the
development of our product candidates and to commercialize any such approved products. Our future capital requirements will depend on many factors,
including:

•

•

•

•

•

•

•

•

•

•

the ability of VYJUVEK to generate sufficient revenue;

the costs of product sales, medical affairs, marketing, manufacturing, and distribution for VYJUVEK;

the outcome, timing and costs of seeking regulatory approvals for VYJUVEK outside the U.S.;

the progress, timing, results, and costs of any clinical trials required for VYJUVEK outside the U.S.;

the  progress,  timing,  results,  and  costs  of  our  current  and  planned  clinical  trials  of  B-VEC  (in  Japan),  KB105,  KB301,  KB407,  KB707,  and
KB408;

the continued development and the filing of IND applications for KB104 and other product candidates;

the initiation, scope, progress, timing, costs and results of drug discovery, laboratory testing, manufacturing, preclinical studies, and clinical trials
for any product candidates that we may pursue in the future;

the costs of maintaining our own commercial-scale CGMP manufacturing facilities;

the outcome, timing, and costs of seeking regulatory approvals for any of our product candidates;

the costs associated with the manufacturing process development and evaluation of third-party suppliers or manufacturers, if necessary;

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the  costs  of  future  activities,  including  product  sales,  medical  affairs,  marketing,  manufacturing,  and  distribution,  in  the  event  we  receive
marketing approval for any of our current and future product candidates;

the  extent  to  which  the  costs  of  our  product  candidates,  if  approved,  will  be  paid  by  health  maintenance,  managed  care,  pharmacy  benefit  and
similar healthcare management organizations, or will be reimbursed by government authorities, private health coverage insurers and other third-
party payors;

subject to receipt of marketing approval, if any, revenue received from commercial sale of our current and future product candidates;

the terms and timing of any current or future collaborations, distribution, licensing, consulting, or other arrangements;

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

the terms of our license agreements, if any, and our achievement of milestones under those agreements;

our ability to establish and maintain collaborations and licenses on favorable terms, if at all; and

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

Identifying  product  candidates  and  conducting  preclinical  testing  and  clinical  trials  is  a  time-consuming,  expensive  and  uncertain  process  that
takes years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve product sales for our
product candidates in development or future product candidates. Revenue will be derived from VYJUVEK until we have another product candidate receive
marketing approval. Accordingly, we may need to continue to rely on additional financing to achieve our business objectives. Any additional fundraising
efforts  may  divert  our  management  from  their  day-to-day  activities,  which  may  adversely  affect  our  ability  to  develop  and  commercialize  our  product
candidates.  Moreover,  the  terms  of  any  financing  may  adversely  affect  the  holdings  or  the  rights  of  our  stockholders  and  the  issuance  of  additional
securities, whether equity or debt, by us, or the possibility of such issuance, may cause the market price of our shares to decline. The sale of additional
equity  or  convertible  securities  would  dilute  all  our  stockholders.  Existing  stockholders  may  not  agree  with  our  financing  plans  or  the  terms  of  such
financings. Adequate additional financing may not be available to us on acceptable terms, or at all. The terms of additional financing may be impacted by,
among other things, general market conditions, the market’s perception of our approved product, VYJUVEK, and product candidates, our growth potential,
and  the  market  price  per  share  of  our  common  stock.  See  “Raising  additional  capital  could  cause  the  price  of  our  common  stock  to  decline  and  cause
dilution to our stockholders, restrict our operations or require us to relinquish rights.”

Changes in tax law may adversely affect our business and financial condition

We are subject to evolving and complex tax laws in the U.S. and the foreign jurisdictions in which we operate. 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. Changes to tax laws (which could apply retroactively) could adversely affect us
and our stockholders. In recent years, such changes have been made and changes are likely to occur in the future, which could have a material adverse
effect on our business, cash flow, financial condition, and results of operations.

Our ability to use our net operating loss carryforwards and certain tax credit carryforwards may be subject to limitation.

We have U.S. federal and state net operating loss carryforwards, which are available to reduce future taxable income. Federal net operating loss
carryforwards  generated  in  tax  years  beginning  after  December  31,  2017  may  be  carried  forward  indefinitely  but  are  limited  to  offset  80%  of  taxable
income in any tax year. Our other federal net operating loss carryforwards and our state net operating loss carryforwards expire beginning in 2037. We also
have federal research and development tax credits which may be used to offset future tax liabilities and expire beginning in 2039. We also have federal
orphan drug tax credits which may be used to offset future tax liabilities, which expire beginning in 2039.

Under  Sections  382  and  383  of  the  Internal  Revenue  Code  of  1986,  as  amended,  changes  in  our  ownership  may  limit  the  amount  of  our  net
operating  loss  carryforwards  and  tax  credit  carryforwards  that  could  be  utilized  annually  to  offset  our  future  taxable  income.  This  limitation  would
generally apply in the event of a cumulative change in ownership of our company of more than 50% within a three-year period. Any such limitation may
significantly reduce our ability to utilize our net operating loss carryforwards and tax credit carryforwards before they expire. Private placements and other
transactions that have occurred since our inception, as well as our initial public offering, may trigger such an ownership change pursuant to Sections 382
and 383. Any such limitation, whether as the result of the initial public offering, prior private placements, sales of

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our  common  stock  by  our  existing  stockholders  or  additional  sales  of  our  common  stock  by  us,  could  have  a  material  adverse  effect  on  our  results  of
operations in future years.

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

We commenced operations in 2016. Our efforts to date have been primarily related to organizing and staffing our company, business planning,
raising  capital,  developing  our  vector  platform  and  related  technologies,  identifying  potential  gene  therapy  product  candidates,  undertaking  preclinical
studies and clinical trials, scaling our manufacturing capabilities, obtaining FDA approval for VYJUVEK, and commercializing VYJUVEK. Consequently,
any predictions you make about our future success, performance or viability may not be as accurate as they could be if we had more experience developing
and commercializing gene therapy products.

We expect our financial condition and operating results to continue to fluctuate from quarter to quarter and year to year due to a variety of factors,
many of which are beyond our control. We are transitioning from a company with a research and development focus to a company undertaking commercial
activities. We may encounter unforeseen expenses, difficulties, complications and delays and may not be successful in such a transition. Accordingly, you
should not rely upon the results of any particular quarterly or annual period as indications of future operating performance.

Risks Related to Ownership of Our Common Stock

Our Chief Executive Officer and Chairman of the Board of Directors and our Founder, President, Research & Development and Director will have the
ability to substantially influence all matters submitted to stockholders for approval.

As of December 31, 2023, Krish S. Krishnan and Suma M. Krishnan, our Chief Executive Officer and Chairman of the Board and our Founder,
President,  Research  &  Development  and  Director,  respectively,  in  the  aggregate,  beneficially  owned  shares  representing  approximately  14%  of  our
outstanding common stock. As a result, they will be able to substantially influence all matters submitted to our stockholders for approval, as well as our
management and affairs. For example, these persons would substantially influence the election of directors and approval of any merger, consolidation, or
sale  of  all  or  substantially  all  our  assets.  This  concentration  of  voting  power  could  delay  or  prevent  an  acquisition  of  our  company  on  terms  that  other
stockholders may desire or result in management of our company that our public stockholders disagree with.

If securities analysts publish negative evaluations of our stock, the price of our stock could decline.

The  trading  market  for  our  common  stock  relies  in  part  on  the  research  and  reports  that  industry  or  financial  analysts  publish  about  us  or  our
business. If securities analysts covering our business downgrade their evaluations of our stock, the price of our stock could decline. If one or more of these
analysts cease to cover our stock, we could lose visibility in the market for our stock, which in turn could cause our stock price to decline.

Raising  additional  capital  could  cause  the  price  of  our  common  stock  to  decline  and  cause  dilution  to  our  stockholders,  restrict  our  operations  or
require us to relinquish rights.

Until such time, if ever, as we can generate substantial and consistent product revenue, we expect to finance our cash needs through a combination

of private and public equity offerings, debt financings, collaborations, strategic alliances, and licensing arrangements. We may issue additional common
stock or restricted securities as part of such financing activities and any such issuances may have a dilutive effect on our then-existing stockholders. Sales
of substantial amounts of our common stock in the open market, or the availability of such shares for sale, could adversely affect the price of our common
stock.

The incurrence of indebtedness would result in fixed payment obligations and a portion of our operating cash flows, if any, being dedicated to the
payment of principal and interest on such indebtedness, and we may be required to agree to certain restrictive covenants, such as limitations on our ability
to incur additional debt, limitations on our ability to acquire, sell or license intellectual property rights and other operating restrictions that could adversely
impact our ability to conduct our business.

If we are unable to raise additional funds through equity or debt financings when needed, and instead raise additional capital through marketing

and distribution agreements or other collaborations, strategic alliances, or licensing arrangements with third parties, we may have to relinquish certain
valuable rights to our current and future product candidates, technologies, future revenue streams or discovery programs or grant licenses on terms that may
not be favorable to us.

The price of our common stock may be volatile and fluctuate substantially, which could result in substantial losses for holders of our common stock.

The price of our common stock has been and is likely to continue to be volatile. The stock market in general and the market for biopharmaceutical
or pharmaceutical companies specifically has experienced extreme volatility that has often been unrelated to the operating performance of such companies.
As a result of this volatility, a stockholder may not be able to sell

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their common stock at or above the price that they paid for it. The market price of our common stock may be influenced by many factors, including:

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our ability to successfully commercialize VYJUVEK;

our ability to successfully proceed to and conduct clinical trials;

results of clinical trials of our product candidates or those of our competitors;

our  ability  to  obtain  regulatory  approval  for  our  product  candidates  and  our  ability  to  successfully  commercialize  any  of  our  approved  product
candidates;

the success of competitive products or technologies;

commencement or termination of collaborations;

regulatory or legal developments in the United States and other countries;

the recruitment or departure of key personnel;

the level of expenses related to VYJUVEK or any of our product candidates or clinical development programs;

the results of our efforts to discover, develop, acquire or in-license additional product candidates;

actual or anticipated changes in estimates as to financial results, development timelines or recommendations by securities analysts;

our inability to manufacture adequate product supply for VYJUVEK and any other approved product or inability to do so at acceptable prices;

disputes or other developments relating to proprietary rights, including patent applications, and issued patents;

our ability to obtain patent protection for our product candidates and technologies;

significant lawsuits, including patent or stockholder litigation;

variations in our financial results or those of companies that are perceived to be similar to us;

changes in the structure of healthcare payment systems;

• market conditions in the pharmaceutical and biotechnology sectors;

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general economic, industry and market conditions; and

the other factors described in this “Risk Factors” section.

If  we  fail  to  maintain  effective  internal  control  over  financial  reporting,  we  may  not  be  able  to  accurately  report  our  financial  results,  which  may
adversely affect investor confidence in our company and, as a result, the value of our common stock.

Our  management  is  responsible  for  establishing  and  maintaining  adequate  internal  control  over  financial  reporting  and  is  required  to  have  an
independent auditor assess the effectiveness of our internal control over financial reporting, pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, as
amended (the “Sarbanes-Oxley Act”). We cannot give any assurances that material weaknesses will not be identified in the future in connection with our
compliance  with  the  provisions  of  Section  404  of  the  Sarbanes-Oxley  Act.  The  existence  of  any  material  weakness  would  preclude  a  conclusion  by
management  and  our  independent  auditors  that  we  maintained  effective  internal  control  over  financial  reporting.  Our  management  may  be  required  to
devote significant time and expense to remediate any material weaknesses that may be discovered and may not be able to remediate any material weakness
in  a  timely  manner.  The  existence  of  any  material  weakness  in  our  internal  control  over  financial  reporting  could  also  result  in  errors  in  our  financial
statements that could require us to restate our financial statements, cause us to fail to meet our reporting obligations and cause investors to lose confidence
in our reported financial information, all of which could lead to a decline in the market price of our common stock.

Provisions in our corporate charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders,
more difficult and may prevent attempts by our stockholders to replace or remove our current management.

Provisions in our corporate charter and our bylaws may discourage, delay, or prevent a merger, acquisition, or other change in control of us that
stockholders may consider favorable, including transactions in which stockholders might otherwise receive a premium for their shares. These provisions
also could limit the price that investors might be willing to pay in the future for shares of our common stock, thereby depressing the market price of our
common  stock.  In  addition,  because  our  board  of  directors  is  responsible  for  appointing  the  members  of  our  management  team,  these  provisions  may
frustrate or prevent

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any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our
board of directors. Among other things, these provisions:

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establish a classified board of directors such that not all members of the board are elected at one time;

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

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

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

require that stockholder actions must be effected at a duly called stockholder meeting and prohibit actions by our stockholders by written consent;

limit who may call stockholder meetings;

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

require  the  approval  of  the  holders  of  at  least  80%  of  the  votes  that  all  our  stockholders  would  be  entitled  to  cast  to  amend  or  repeal  certain
provisions of our bylaws.

Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law,
which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years after
the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or combination is approved in a
prescribed manner.

We have broad discretion in the use of our cash, cash equivalents and marketable securities and may not use them effectively.

Our management has broad discretion in the application of our cash, cash equivalents and marketable securities and could spend these funds in
ways  that  do  not  improve  our  results  of  operations  or  enhance  the  value  of  our  common  stock.  The  failure  by  our  management  to  apply  these  funds
effectively could result in financial losses that could have a material adverse effect on our business, cause the price of our common stock to decline and
delay the development of our product candidates. Pending their use, we may invest our cash and cash equivalents in a manner that does not produce income
or that loses value.

Because  we  do  not  anticipate  paying  any  cash  dividends  on  our  common  stock  in  the  foreseeable  future,  capital  appreciation,  if  any,  will  be
stockholders’ sole source of gain.

We have never declared or paid cash dividends on our common stock. We currently intend to retain all our future earnings to finance the growth
and  development  of  our  business.  In  addition,  the  terms  of  any  future  debt  agreements  may  preclude  us  from  paying  dividends.  As  a  result,  capital
appreciation, if any, of our common stock will be stockholders’ sole source of gain for the foreseeable future.

Issuing additional shares of our common stock could cause the price of our common stock to decline and cause dilution to our stockholders.

To  the  extent  we  raise  additional  capital  by  issuing  additional  shares  of  our  common  stock,  or  securities  convertible  into  or  exchangeable  or
exercisable for common stock, our existing stockholders may experience substantial dilution. Additionally, if we issue additional shares of our common
stock or instruments convertible into our common stock, the trading price of our common stock could decline. We cannot predict whether we will raise
additional capital by issuing shares of our common stock, or securities convertible into or exchangeable or exercisable for common stock, the size of any
future issuances, or the effect, if any, that they may have on the market price for our common stock. We also have stock options, restricted common stock,
restricted stock units, and performance stock units outstanding, and we expect to issue additional equity awards to directors and employees. The issuance of
restricted common stock, common stock upon exercise of outstanding options, common stock upon vesting of restricted stock units, or common stock upon
vesting of performance stock units would be dilutive and may cause the market price for our common stock to decline. If we issue preferred stock in the
future, the holders of that preferred stock could gain rights superior to our existing stockholders, such as liquidation and other preferences, or the market
price of our common stock could be adversely affected.

Item 1B. Unresolved Staff Comments.

None.

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Item 1C. Cybersecurity.

Cybersecurity represents a critical component of our overall approach to risk management. Our cybersecurity policies, standards, and practices are
integrated into our enterprise risk management approach, and cybersecurity risks are among the core enterprise risks that are subject to oversight by our
Board of Directors (the “Board”). We generally approach cybersecurity threats through a cross-functional, multilayered approach, with specific goals of: (i)
identifying, preventing and mitigating cybersecurity threats to the Company; (ii) preserving the confidentiality, security and availability of the information
that we collect and store; (iii) protecting the Company’s intellectual property; (iv) maintaining the confidence of our customers, suppliers and other third
parties; and (v) providing appropriate public disclosure of cybersecurity risks and incidents when required.

Cyber Security Risk Management and Strategy

Our cybersecurity program focuses on the following areas:

• Vigilance:  Our  cybersecurity  threat  operations  function  24/7  with  the  specific  goal  of  identifying,  preventing  and  mitigating  cybersecurity

threats and responding to cybersecurity incidents in accordance with our established incident response and recovery plans.

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Systems  Safeguards:  We  deploy  systems  safeguards  that  are  designed  to  protect  the  Company’s  information  systems  from  cybersecurity
threats, including firewalls, intrusion prevention and detection systems, anti-malware functionality and access controls, which are evaluated
and improved through ongoing vulnerability assessments and cybersecurity threat intelligence.

Third-Party  Risk  Management:  We  maintain  a  comprehensive,  risk-based  approach  to  identifying  and  overseeing  cybersecurity  risks
presented by third parties, including vendors, service providers and other external users of the Company’s systems, as well as the systems of
third parties that could adversely impact our business in the event of a cybersecurity incident affecting those third-party systems.

Training: We provide periodic mandatory training for personnel regarding cybersecurity threats, which reinforces the Company’s information
security policies, standards and practices.

Incident  Response  and  Recovery  Planning:  We  have  established  and  maintain  incident  response  and  recovery  plans  that  address  the
Company’s response to a cybersecurity incident and the recovery from a cybersecurity incident, and such plans are tested and evaluated on an
regular basis.

Communication, Coordination and Disclosure: We utilize a cross-functional approach to address the risk from cybersecurity threats, involving
management personnel from the Company’s technology, operations, legal, financial, and other key business functions, as well as the members
of the Board in an ongoing dialogue regarding cybersecurity threats and incidents, while also implementing controls and procedures so that
decisions regarding the disclosure and reporting of such incidents can be made by management in a timely manner.

A part of our strategy for managing risks from cybersecurity threats is assessment and testing of the effectiveness of our cybersecurity measures.
We  engage  third  parties  to  perform  assessments  on  our  cybersecurity  measures,  and  we  adjust  our  cybersecurity  measures  as  necessary  based  on  the
information provided by the assessments.

Governance

The Board oversees the management of risks from cybersecurity threats. The Board receives regular presentations and reports on cybersecurity,
which address a wide range of topics and also receives prompt and timely information regarding any cybersecurity incident that is or may become material,
as well as ongoing updates regarding such incident until it has been addressed. At least once each year, the Board discusses the Company’s approach to
cybersecurity  risk  management  with  the  Company’s  Vice  President  of  Information  Technology,  who  is  the  member  of  management  that  is  principally
responsible for overseeing cybersecurity at the Company, in partnership with other business leaders across the Company, including our Chief Executive
Officer, Chief Accounting Officer, General Counsel, and Human Resources leader. Our Vice President of Information Technology has served in various
roles  in  information  technology  and  information  security  for  over  28  years,  including  serving  as  Chief  Information  Security  Officer  of  several  public
companies.  He  holds  undergraduate  and  graduate  degrees  in  electrical  engineering  and  computer  science  and  has  attained  numerous  professional
certifications in Information Security throughout his career.

Cybersecurity threats, including as a result of any previous cybersecurity incidents, have not materially affected or are reasonably likely to affect

the Company, including its business strategy, results of operations, or financial condition.

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Item 2. Properties.

As of December 31, 2023, we leased approximately 54,000 square feet of combined laboratory and office space in Pittsburgh, Pennsylvania that
we use for our research, development and manufacturing efforts. The lease for approximately 7,000 square feet of office space expires in September 2024,
and the lease covering the remaining combined laboratory and office space expires in October 2031.

As of December 31, 2023, we also leased additional U.S. office space in Boston, Massachusetts and European office space in Zug, Switzerland,

and Amsterdam, Netherlands.

In December 2019, we entered into a lease agreement for our second commercial gene therapy facility ("ASTRA") in the Pittsburgh, Pennsylvania
area,  which  contained  an  option  to  purchase  the  building.  In  January  2021,  we  entered  into  a  Purchase  and  Sale  Agreement  (“PSA”)  with  Northfield  I,
LLC, an Ohio limited liability company to acquire ASTRA, and the related purchase closed in March 2021. In June 2021, we entered into a Standard Form
of Contract for Construction and the corresponding General Conditions of the Contract for Construction with The Whiting-Turner Contracting Company
(“Whiting-Turner”), pursuant to which Whiting-Turner constructed and managed the construction of ASTRA. The facility was completed and validated in
2023. Refer to Note 8 of the Notes to the Consolidated Financial Statements included in Part II of Item 8 of this Annual Report on Form 10-K for more
information regarding this transaction.

Item 3. Legal Proceedings.

The information set forth in Note 7 of the Notes to the Consolidated Financial Statements included in Part II Item 8 of this Annual Report on Form

10-K is incorporated by reference into this Item 3.

Item 4. Mine Safety Disclosures.

Not applicable.

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

PART II

Market Information

Our common stock trades on the NASDAQ Global Select Market under the symbol KRYS.

Holders of Record

As  of  February  19,  2024,  there  were  two  stockholders  of  record  of  our  common  stock.  The  actual  number  of  stockholders  is  greater  than  this
number of record holders, and includes stockholders who are beneficial owners, but whose shares are held in street name by brokers and other nominees.
This number of holders of record also does not include stockholders whose shares may be held in trust by other entities.

Dividend Policy

We have never declared or paid cash dividends on our capital stock. We currently intend to retain any future earnings for use in the operation and
growth of our business and do not intend to declare or pay any cash dividends in the foreseeable future. Any further determination to pay dividends on our
capital stock will be at the discretion of our board of directors, subject to applicable laws, and will depend on our financial condition, results of operations,
capital requirements, general business conditions and other factors that our board of directors considers relevant.

Purchases of Equity Securities by the Issuer or Affiliated Purchasers

There were no repurchases of shares of common stock made during the three months ended December 31, 2023.

Sales of Unregistered Securities

There have been no sales of unregistered securities by us during the past three years except as previously disclosed on prior Quarterly Reports on

Form 10-Q and Current Reports on Form 8-K.

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Stock Performance Graph

Set forth below is a graph comparing the cumulative total return on an indexed basis of a $100 investment in the Company’s common stock, the
Nasdaq Composite Index and the Nasdaq Biotechnology Index commencing on December 31, 2018 and continuing through December 31, 2023. The graph
assumes our closing sale price on December 31, 2018 of $20.78

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per share as the initial value of our common stock for indexing purposes. Points on the graph represent the performance as of the last business day of each
of the months indicated.

The comparisons shown in the graph below are based upon historical data. We caution that the stock price performance shown in the graph below

is not necessarily indicative of, nor is it intended to forecast, the potential future performance of our common stock.

This performance graph shall not be deemed “soliciting material” or to be “filed” with the SEC for purposes of Section 18 of the Exchange Act or
incorporated  by  reference  into  any  filing  of  Krystal  Biotech,  Inc.  under  the  Securities  Act  or  the  Exchange  Act,  except  to  the  extent  we  specifically
incorporate it by reference into such filing. The past performance of our common stock is no indication of future performance.

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Item 6. [Reserved]

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The  following  information  should  be  read  in  conjunction  with  the  consolidated  financial  statements  and  related  notes  thereto  included  in  this
Annual Report on Form 10-K. In addition to historical information, this report contains forward-looking statements that involve risks and uncertainties
which may cause our actual results to differ materially from plans and results discussed in forward-looking statements. We encourage you to review the
risks and uncertainties discussed in the sections entitled Item 1A. “Risk Factors” and “Forward-Looking Statements” included at the beginning of this
Annual Report on Form 10-K. The risks and uncertainties can cause actual results to differ significantly from those forecast in forward-looking statements
or implied in historical results and trends. We caution readers not to place undue reliance on any forward-looking statements made by us, which speak only
as  of  the  date  they  are  made.  We  disclaim  any  obligation,  except  as  specifically  required  by  law  and  the  rules  of  the  U.S.  Securities  and  Exchange
Commission, or SEC, to publicly update or revise any such statements to reflect any change in our expectations or in events, conditions or circumstances
on  which  any  such  statements  may  be  based,  or  that  may  affect  the  likelihood  that  actual  results  will  differ  from  those  set  forth  in  the  forward-looking
statements.

This section of this Form 10-K generally discusses 2023, 2022 and 2021 items and year-to-year comparisons between 2023 and 2022, and 2022

and 2021 of the Company’s results of operations and cash flows.

Overview

We  are  a  fully  integrated,  commercial-stage  biotechnology  company  focused  on  the  discovery,  development,  and  commercialization  of  genetic
medicines to treat diseases with high unmet medical needs. Using our patented gene therapy technology platform that is based on engineered HSV-1, we
create vectors that efficiently deliver therapeutic transgenes to cells of interest in multiple organ systems. The cell’s own machinery then transcribes and
translates the encoded effector to treat or prevent disease. We formulate our vectors for non-invasive or minimally invasive routes of administration at a
healthcare professional’s office or in the patient’s home by a healthcare professional. Our goal is to develop easy-to-use medicines to dramatically improve
the lives of patients living with rare and serious diseases. Our innovative technology platform is supported by an in-house, FDA-inspected, commercial
scale Current Good Manufacturing Practice (“CGMP”) manufacturing facility and a second, completed and qualified, commercial scale CGMP facility to
support future expansion. Refer to Part I, Item 1 - Business for more information about our United States Food and Drug Administration (“FDA”) approved
product, VYJUVEK , clinical development pipeline and research programs, and the status of our product candidates.

®

Highlights and Recent Developments

VYJUVEK (beremagene geperpavec-svdt or B-VEC; referred to as B-VEC outside the U.S.)

In May 2023, the FDA approved B-VEC for the treatment of patients, six months of age or older, suffering from dystrophic epidermolysis bullosa
(“DEB”). FDA approval was based, in part, on our pivotal Phase 3 clinical trial, a randomized, double-blind, intra-patient placebo-controlled multi-center
study,  that  demonstrated  that  B-VEC  was  both  well-tolerated  and  significantly  improved  wound  closure  in  DEB  patients.  Clinical  data  from  our
registrational Phase 3 B-VEC trial were published in the New England Journal of Medicine in December 2022. B-VEC is marketed as VYJUVEK in the
United States and is the first and only corrective medicine approved by the FDA for the treatment of DEB, both recessive and dominant. VYJUVEK can be
administered by a healthcare professional in either a healthcare professional or home setting.

We launched VYJUVEK in the United States in the second quarter of 2023. Net product revenue for VYJUVEK for the year ended December 31,

2023 was $50.7 million.

We have made steady progress securing access and reimbursement for VYJUVEK since launch and have secured positive policies or coverage
decisions from plans covering over 93% of commercial and Medicaid lives in the United States. In January 2024, we announced that the United States
Centers for Medicare & Medicaid Services, or CMS, had assigned a permanent and product-specific J-code (J3401) for VYJUVEK, effective on January 1,
2024.

We  seek  to  make  the  patient  experience  of  starting  and  continuing  on  VYJUVEK  treatment  as  seamless  as  possible.  Since  launch,  the
infrastructure has been in place for patients to be treated in their home by a healthcare provider, or HCP, reducing the need for regular visits to a clinic or
hospital. Krystal Connect
, our U.S. in-house patient services call center, has been active since FDA approval and assists patients, care givers and HCPs
interested in accessing VYJUVEK. We also continue to offer no-cost genetic testing through our DecodeDEB program. Through the end of 2023, patient
compliance with once weekly VYJUVEK treatment has been 96%.

TM

We  continue  to  pursue  development  and  commercialization  activities  to  maximize  access  to  B-VEC  in  the  United  States  and  globally.  Recent

highlights subsequent to FDA approval are summarized below:

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•

•

•

In  December  2023,  B-VEC  was  granted  orphan  drug  designation,  or  ODD,  status  for  the  treatment  of  DEB  by  the  Japan  Ministry  of  Health,
Labour  and  Welfare,  a  designation  which  confers  specific  benefits  for  orphan  drug  development  including  priority  review  of  applications,
extended registration validity, and reduced development costs. We anticipate filing our Japan New Drug Application with Japan’s Pharmaceuticals
and Medical Devices Agency (“PMDA”) in the second half of 2024 enabling a potential authorization in 2025

In October 2023, we submitted a Marketing Authorization Application (“MAA”) to the European Medicines Agency (“EMA”) for B-VEC for the
treatment of DEB in patients from birth. In November 2023, we were notified that the MAA had been validated and was now under Committee for
Medicinal Products for Human Use review. We expect an EMA decision on our MAA in the second half of 2024.

In July 2023, the PMDA in Japan officially accepted the open label extension (“OLE”) study of B-VEC. Following that acceptance, we initiated
the Japan OLE study and completed study enrollment. A total of 5 Japanese DEB patients have been enrolled. Details of the study can be found at
jrct.niph.go.jp under JRCT ID jRCT2053230075. Nothing included on this website shall be deemed incorporated by reference into this Annual
Report on Form 10-K.

In  April  2023,  we  announced  clinical  data  on  the  compassionate  use  of  B-VEC,  administered  as  an  eye  drop,  to  treat  a  patient  suffering  from
ocular complications of DEB. Data were first presented at the Association for Research in Vision and Ophthalmology 2023 Annual Meeting in
April 2023, and subsequently published in the New England Journal of Medicine in February 2024. Regular application of B-VEC to the eye was
well tolerated and associated with full corneal healing at 3 months and visual acuity improvement from hand motion to 20/25 by 8 months. Based
on this early clinical evidence of safety and potential benefit under compassionate use, we started discussions with the FDA in the first quarter of
2024 to align on a potential clinical development path for ophthalmic B-VEC.

In January 2024, the United States Patent and Trademark Office, or USPTO, issued U.S. Patent No. 11,865,148, covering methods of delivering
human transgenes to the eye using replication-incompetent HSV-1. This patent covers the administration of B-VEC to the eye, as well as novel
applications of our HSV-1 based platform to deliver genetic material to the eye via multiple routes of administration for the potential treatment of
genetic eye diseases. The patent expires in 2037. Refer to Part I, Item 1 - Business for more information about our intellectual property and issued
patents.

In  February  2024,  the  FDA  agreed  with  our  proposed  single  arm,  open  label  study  in  approximately  10  patients  to  enable  approval  of  B-VEC
eyedrops to treat ocular complications which are thought to affect over 25% of DEB patients. We plan to initiate this study in the second half of
2024.

Pipeline

• KB407 is an inhaled (nebulized) formulation of our novel vector designed to deliver two copies of the full-length cystic fibrosis transmembrane
conductance regulator, or CFTR, transgene for the treatment of cystic fibrosis (“CF”), a serious rare lung disease caused by missing or mutated
CFTR protein. In August 2022, we announced that the FDA had accepted our investigational new drug (“IND”) application to evaluate KB407 in
a clinical trial to treat patients with cystic fibrosis. In July 2023, we dosed the first patient in our Phase 1 CORAL-1 study evaluating KB407,
delivered via a nebulizer, for the treatment of patients with CF. The CORAL-1 study is a multi-center, dose-escalation trial of KB407 in patients
with  CF,  regardless  of  their  underlying  genotype.  In  the  fourth  quarter  of  2023,  we  completed  the  first  cohort  of  the  CORAL-1  study  with  no
severe or serious adverse events and, in January 2024, we initiated dosing in the second of three cohorts. Details of the Phase 1 study can be found
at www.clinicaltrials.gov under NCT identifier NCT05504837. Nothing included on this website shall be deemed incorporated by reference into
this Annual Report on Form 10-K. In January 2023, the European Commission granted Orphan Designation for KB407 for the treatment of CF.

• KB408 is an inhaled (nebulized) formulation of our novel vector designed to deliver two copies of the SERPINA1 transgene, that encodes for
normal human alpha-1 antitrypsin protein, for the treatment of alpha-1- antitrypsin deficiency, or AATD. In September 2023, the FDA accepted
our IND application to evaluate KB408, delivered via a nebulizer, in a clinical trial to treat patients with AATD. In February 2024, the Company
dosed the first patient in the KB408 Phase 1 SERPENTINE-1 study for the treatment of Alpha-1 Antitrypsin Deficiency. SERPENTINE-1 is a
Phase 1 open-label, single dose escalation study in adult patients with AATD with a PI*ZZ genotype. Three planned dose levels of KB408 will be
evaluated in up to 12 patients to evaluate the safety, tolerability, and proof-of-mechanism of KB408. Cohorts 1 and 2 will focus predominantly on
safety with dose escalation and pharmacodynamic activity in the lung will be assessed at the highest dose by bronchoscopy in Cohort 3. We are
working  closely  with  the  Alpha-1  Foundation  and  their  Therapeutic  Development  Network  on  SERPENTINE-1  study  and  intend  to  announce
interim  data  from  the  study  in  the  second  half  of  2024.  The  FDA  granted  ODD  to  KB408  for  the  treatment  of  AATD  in  September  2023.  We
presented preclinical pharmacology data for KB408 at the European Society of Gene & Cell Therapy Congress that was held in October 2023.

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• KB707  is  a  redosable,  immunotherapy  designed  to  deliver  genes  encoding  both  human  IL-2  and  IL-12  to  the  tumor  microenvironment  and
promote systemic immune-mediated tumor clearance. Two formulations of KB707 are in development, a solution formulation for transcutaneous
injection and an inhaled (nebulized) formulation for lung delivery. In July 2023, the FDA granted intratumoral KB707 Fast Track Designation for
the treatment of anti-PD-1 relapsed/refractory locally advanced or metastatic melanoma and accepted our IND application to evaluate intratumoral
KB707  in  a  clinical  trial  to  treat  patients  with  locally  advanced  or  metastatic  solid  tumors.  The  study,  OPAL-1,  is  an  open-label,  multi-center,
monotherapy, dose escalation and expansion Phase 1 study, enrolling patients with locally advanced or metastatic solid tumors, who relapsed or
are refractory to standard of care, with at least one measurable and injectable tumor accessible by transcutaneous route. We dosed the first patient
in the OPAL-1 study in October 2023 and enrollment is ongoing. Details of the Phase 1 study can be found at www.clinicaltrials.gov under NCT
identifier NCT05970497. Nothing included on this website shall be deemed incorporated by reference into this Annual Report on Form 10-K. We
presented preclinical efficacy data generated in syngeneic mouse models using murine equivalents to KB707 at the Society for Immunotherapy in
Cancer Annual Meeting that was held in November 2023.

•

•

In January 2024, the FDA accepted an amendment to our IND application to evaluate inhaled KB707 in a clinical trial to treat patients with locally
advanced or metastatic solid tumors of the lung. We plan on initiating this open-label, multi-center, monotherapy, dose escalation and expansion
Phase 1 study, KYANITE-1, in the first half of 2024. Details of the Phase 1 study can be found at www.clinicaltrials.gov under NCT identifier
NCT06228326.  Nothing  included  on  this  website  shall  be  deemed  incorporated  by  reference  into  this  Annual  Report  on  Form  10-K.  Inhaled
KB707  also  received  Fast  Track  Designation  from  the  FDA  in  February  2024,  for  the  treatment  of  patients  with  solid  tumors  with  pulmonary
metastases that are relapsed or refractory to standard of care therapy.

In October 2023, the USPTO issued U.S. Patent No. 11,779,660, covering compositions of matter containing engineered HSV constructs encoding
IL-2  and  IL-12,  including  KB707.  The  patent  expires  in  2042.  Refer  to  Part  I,  Item  1  -  Business  for  more  information  about  our  intellectual
property and issued patents.

• KB105  is  a  topical  gel  containing  our  novel  vector  designed  to  deliver  two  copies  of  the  TGM1  transgene  encoding  the  human  enzyme
transglutaminase-1 (“TGM1”) for the treatment of TGM1-deficient autosomal recessive congenital ichthyosis, a serious rare skin disorder caused
by missing or mutated TGM1 protein. A randomized, placebo-controlled Phase 1/2 study is ongoing. On July 1, 2021, we announced complete
data from the Phase 1 trial, showing repeat topical KB105 dosing continued to be well tolerated with no adverse events or evidence of immune
response. Details of the Phase 1/2 study can be found at www.clinicaltrials.gov under NCT identifier NCT04047732. Nothing included on this
website shall be deemed incorporated by reference into this Annual Report on Form 10-K. We plan to resume enrollment in the Phase 2 portion of
this trial later in 2024. In August 2023, the USPTO issued U.S. Patent No. 11,717,547, the second composition of matter and method of use patent
related to KB105. The patent expires in 2039. Refer to Part I, Item 1 - Business for more information about our intellectual property and issued
patents.

• KB104 is a topical gel formulation of our novel vector designed to deliver two copies of the SPINK5 transgene encoding serine protease inhibitor
Kazal-type 5 (“SPINK5”) for the treatment of Netherton Syndrome, a debilitating autosomal recessive skin disorder caused by missing or mutated
SPINK5  protein.  The  FDA  has  granted  KB104  Rare  Pediatric  Designation  for  the  treatment  of  Netherton  Syndrome.  We  plan  to  file  an  IND
application and initiate a clinical trial of KB104 to treat patients with Netherton Syndrome following initiation of the KB105 Phase 2 study. In
May  2023,  the  USPTO  issued  U.S.  Patent  No.  11,642,384,  covering  compositions  of  matter  containing  replication-defective  HSV  constructs
encoding SPINK5, including KB104. The patent expires in 2039. Refer to Part I, Item 1 – Business for more information about our intellectual
property and issued patents.

• KB301 is a solution formulation of our novel vector for intradermal injection designed to deliver two copies of the COL3A1 transgene to address
signs of aging or damaged skin caused by declining levels of, or damaged proteins within the extracellular matrix, including type III collagen. In
April  2023,  Jeune  Aesthetics,  Inc.  (“Jeune  Aesthetics”),  our  wholly-owned  subsidiary,  initiated  and  treated  the  first  subject  in  the  PEARL-1
Cohort 3 clinical study. The PEARL-1 Cohort 3 study is an open label study to evaluate different doses of KB301 for the improvement of lateral
canthal lines, or LCL, at rest in up to 20 subjects. In January 2024, Jeune Aesthetics initiated the PEARL-1 Cohort 4 clinical study, an open label
study to evaluate KB301 for the improvement of dynamic wrinkles of the décolleté in up to 20 subjects. These studies are running simultaneously,
and Jeune Aesthetics expects to announce results for both cohorts in the first half of 2024. Following completion of this study, Jeune Aesthetics
plans  to  initiate  a  Phase  2  study  of  KB301.  Details  of  the  Phase  1  study  can  be  found  at  www.clinicaltrials.gov  under  NCT  identifier
NCT04540900.  Nothing  included  on  this  website  shall  be  deemed  incorporated  by  reference  into  this  Annual  Report  on  Form  10-K.  Jeune
Aesthetics has several other aesthetic medicine product candidates in various stages of preclinical development.

2023 Business Highlights

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•

In August 2023, we sold our Rare Pediatric Disease Priority Review Voucher, or PRV, for $100.0 million. The PRV was awarded in connection
with the FDA’s accelerated approval of VYJUVEK for the treatment of DEB for patients 6 months of age and older.

In August 2023, we began research and development operations in our second commercial scale CGMP biologics manufacturing facility, ASTRA,
a 155,000 sq. ft. state-of-the-art CGMP facility with comprehensive end-to-end capabilities.

In May 2023, shortly after we received FDA approval of VYJUVEK, we issued and sold 1,729,729 shares of common stock at a price of $92.50
per share in a private placement (the “PIPE”) to certain accredited investors. Net proceeds from the PIPE were approximately $160.0 million. We
filed a registration statement with the SEC in July 2023 registering the resale of the shares of common stock issued in the PIPE.

• On March 6, 2023, we announced the appointment of Catherine Mazzacco to our Board of Directors.

Financial Overview

Product Revenue

After FDA approval of VYJUVEK in May 2023, we began commercial marketing and sales of the product throughout the United States and began
recognizing revenue in 3Q 2023. Our future revenue will fluctuate from quarter to quarter for many reasons, including the uncertain timing and amount of
any such sales.

We have contracted to sell VYJUVEK to a limited number of specialty pharmacy providers (“SPs”) that mix the medication and administer it to
patients in the patient’s home by a healthcare professional and through a specialty distributor (“SD”) to hospitals and outpatient clinics where patients are
administered  the  medication  at  a  healthcare  professional’s  office.  The  transaction  price  that  we  recognize  as  revenue  for  VYJUVEK  sales  includes  an
estimate of variable consideration, which includes discounts, returns, copay assistance, and rebates that are offered within our contracts. Refer to Note 2 of
our consolidated financial statements for additional information.

Cost of Goods Sold

We recognize cost of goods sold for direct and indirect costs related to the manufacturing of VYJUVEK. These costs consist of manufacturing
costs, personnel costs, including stock-based compensation, facility costs, and other indirect overhead costs. Cost of goods sold may also include period
costs related to certain manufacturing services and inventory adjustment charges.

Prior to receiving FDA approval in May 2023, costs associated with the manufacturing of VYJUVEK were expensed as research and development

expense. As such, a portion of the cost of inventory sold during 2023 was expensed prior to FDA approval.

Research and Development Expenses

Research and development expenses consist primarily of costs incurred to advance our preclinical and clinical candidates, which include:

expenses  incurred  under  agreements  with  contract  manufacturing  organizations  (“CMOs”),  consultants  and  other  vendors  that  conduct  our
preclinical activities;

costs of acquiring, developing and manufacturing clinical trial materials and lab supplies;

facility costs, depreciation and other expenses, which include direct expenses for rent and maintenance of facilities and other supplies; and

payroll related expenses, including stock-based compensation expense.

•

•

•

•

We  expense  internal  research  and  development  costs  to  operations  as  incurred.  We  expense  third-party  costs  for  research  and  development
activities, such as the manufacturing of preclinical and clinical materials, based on an evaluation of the progress to completion of specific tasks such as
manufacturing of drug substance, fill/finish and stability testing, which is provided to us by our vendors. We expect our research and development expenses
will increase as we continue the manufacturing of preclinical and clinical materials and manage the clinical trials of, and seek regulatory approval for, our
product candidates and expand our product portfolio. In the near term, we expect that our research and development expenses will increase as we continue
our Japan OLE study for B-VEC, continue our Phase 1 trials for KB407, KB408, and intratumoral KB707, initiate our Phase 1 trials for inhaled KB707,
resume dosing with KB105 Phase 1/2 clinical trial, complete Phase 1 Cohorts 3 and 4 and initiate a Phase 2 trial for KB301, begin our open label study
with  ophthalmic  B-VEC,  and  incur  preclinical  expenses  for  our  other  product  candidates.  Due  to  the  numerous  risks  and  uncertainties  associated  with
product

73

development, we cannot determine with certainty the duration, costs and timing of clinical trials, and, as a result, the actual costs to complete clinical trials
may exceed the expected costs.

Selling, General and Administrative Expenses

Selling,  general  and  administrative  expenses  consist  principally  of  salaries  and  other  related  costs,  including  stock-based  compensation  for
personnel in our executive, commercial, business development and other administrative functions. Selling, general and administrative expenses also include
professional fees associated with corporate and intellectual property-related legal expenses, consulting and accounting services, facility-related costs and
expenses associated with obtaining and maintaining patents. Other selling, general, and administrative costs include travel expenses, patient access program
fees, management service fees, and other selling expenses which include transportation, shipping and handling fees.

We anticipate that our selling, general and administrative expenses will increase in the future to support the continued research and development
of our product candidates. These increases will likely include increased costs for insurance, costs related to the hiring of additional personnel and payments
to  outside  consultants,  lawyers  and  accountants,  among  other  expenses.  Additionally,  we  anticipate  that  we  will  continue  to  increase  our  salary  and
personnel costs and other expenses to support B-VEC commercialization globally.

ASTRA Capital Expenditures

In March 2021, we closed on the purchase of the building that was constructed to house our second CGMP facility, ASTRA. We received the
permanent occupancy permit for ASTRA in March 2023, which permitted utilization of certain parts of the building, and subsequently placed a portion of
ASTRA into service. Qualification of the facility was completed later in 2023, and we began research and development operations. We incurred significant
capital expenditures related to the construction of ASTRA in 2023 and expect to continue to incur capital expenditures related to ASTRA throughout the
operational life of the facility.

Gains from Sale of Priority Review Voucher

Gain  from  sale  of  priority  review  voucher  relates  to  proceeds  from  sale  of  the  rare  pediatric  PRV  we  received  in  connection  with  the  FDA’s

approval of VYJUVEK.

Interest and Other Income

Interest and other income consists primarily of income earned from our cash, cash equivalents and investments.

Interest Expense

Interest  expense  consists  primarily  of  non-cash  interest  expense  recognized  to  accrete  the  build  to  suit  financial  obligation  to  a  balance  that

equaled the cash consideration that was paid upon the close of the purchase of ASTRA.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial position and results of operations is based on our financial statements, which have been
prepared in accordance with U.S. generally accepted accounting principles, or GAAP. The preparation of financial statements in conformity with GAAP
requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis,
we evaluate estimates which include, but are not limited to, variable consideration associated with revenue recognition, stock-based compensation expense,
accrued expenses, the fair value of financial instruments, and the valuation allowance included in the deferred income tax calculation during the period. We
base  our  estimates  on  historical  experience  and  other  market-specific  or  other  relevant  assumptions  that  we  believe  to  be  reasonable  under  the
circumstances. Actual results may differ materially from those estimates or assumptions.

While our significant accounting policies are described in more detail in the notes to our financial statements appearing elsewhere in this Annual
Report  on  Form  10-K,  we  believe  the  following  accounting  policies  to  be  most  critical  to  the  judgments  and  estimates  used  in  the  preparation  of  our
financial statements.

Revenue Recognition

After FDA approval of VYJUVEK in May 2023, we began commercial marketing and made our first product sales in 3Q 2023. ASC 606 Revenue

from Contracts with Customers requires us to make estimates of variable consideration, included in our contracts, to be included in the transaction price.

Product revenue, net is recorded at the net sales price, or transaction price, upon delivery and transfer of control to the customer, and includes an
estimate  of  variable  consideration,  which  results  from  discounts,  rebates,  copay  assistance,  and  returns  that  are  offered  within  contracts  between  the
Company and its customers.

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–

Prompt  Pay  Discounts:  As  an  incentive  for  prompt  payment,  we  offer  a  cash  discount  to  our  counterparty.  We  estimate  accrued  prompt  pay
discounts  using  the  most  likely  amount  method.  We  expect  that  all  eligible  counterparties  will  comply  with  the  contractual  terms  to  earn  the
discount. We record the discount as an allowance against accounts receivable, net and a reduction of revenue.

– Government  Rebates:  We  participate  in  certain  government  rebate  programs  including  Medicaid,  Medicare  and  Tricare.  We  estimate  accrued
government  rebates  using  the  expected  value  method.  We  accrue  estimated  rebates  based  on  estimated  percentages  of  VYJUVEK  that  will  be
prescribed to qualified patients, estimated rebate percentages and estimated levels of inventory in the distribution channel that will be prescribed to
qualified patients and record the rebates as a reduction of revenue. Accrued government rebates are included in other accrued liabilities on the
consolidated balance sheets. For Medicare, the Company also estimates the accrued liability based on the number of patients in the prescription
drug coverage gap under the Medicare Part D program.

– Commercial Rebates:  We  participate  in  certain  commercial  rebate  programs.  Under  these  rebate  programs,  we  pay  a  rebate  to  the  commercial
entity  or  third-party  administrator  of  the  program.  Accrued  commercial  rebates  are  estimated  using  the  expected  value  method.  We  accrue
estimated rebates based on contract prices, estimated percentages of VYJUVEK that will be prescribed to qualified patients and estimated levels
of inventory in the distribution channel and record the rebate as a reduction of revenue. Accrued commercial rebates are included in other accrued
liabilities on the consolidated balance sheets.

– Copay Assistance: The Company provides copay assistance to qualified patients with commercial insurance in states that allow copay assistance,
helping  them  meet  copay  obligations  to  their  insurance  provider.  The  Company  reimburses  pharmacies  for  this  discount  through  third-party
vendors.  The  Company  estimates  copay  assistance  costs  using  the  expected  value  method.  The  estimate  is  based  on  contract  prices,  estimated
percentages of VYJUVEK that will be prescribed to qualified patients, average assistance paid based on reporting from third-party vendors and
estimated levels of inventory in the distribution channel. Copay assistance costs are recorded as reductions to revenue and are accrued in other
accrued liabilities on the consolidated balance sheets.

–

Product Returns: We offer SPs and SDs limited return rights relating only to product damage or defects identified upon receipt, and therefore we
expect  minimal  returns.  Returns  are  estimated  taking  into  consideration  several  factors  including  these  limited  product  return  rights,  historical
return activity, and other relevant factors.. There were no returns for the year ended December 31, 2023.

Variable consideration is estimated and reduces the transaction price to reflect our best estimate of the amount of consideration to which we are
entitled  based  on  the  terms  of  the  contracts  and  are  recorded  in  the  same  period  the  related  product  revenue  is  recognized.  The  amount  of  variable
consideration  that  is  included  in  the  transaction  price  may  be  constrained  and  is  included  in  the  net  sales  price  only  to  the  extent  that  it  is  considered
probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of consideration
ultimately received may differ from our estimates. If actual results in the future vary from our estimates, we will adjust these estimates in the period these
variances become known.

Accrued Research and Development Expenses

As part of the process of preparing our financial statements, we are required to estimate our accrued research and development expenses, prepaid
assets  and  other  current  liabilities.  This  process  involves  reviewing  open  contracts  and  commitments,  communicating  with  our  personnel  to  identify
services that have been performed for us and estimating the level of service performed and the associated cost incurred for the service when we have not
yet been invoiced or otherwise notified of the actual cost. The majority of our service providers invoice us monthly in arrears for services performed or
when contractual milestones are met. We make estimates of our accrued research and development expenses and other current liabilities as of each balance
sheet date in our financial statements based on facts and circumstances known to us at that time. Examples of accrued research and development expenses,
prepaid assets and other current liabilities include fees paid to contract manufacturers made in connection with the manufacturing of preclinical and clinical
trials materials.

We record our expenses related to clinical manufacturing based on our estimates of the services performed pursuant to contracts with the entities
producing clinical materials on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result
in uneven payment flows. Payments under these types of contracts depend heavily upon the successful completion of many separate tasks involved in the
manufacturing  of  drug  product.  In  accruing  service  fees,  we  estimate  the  time  period  over  which  services  will  be  performed,  and  the  actual  services
performed in each period. If actual results in the future vary from our estimates, we will adjust these estimates in the period these variances become known.

75

Stock-Based Compensation

We  have  applied  the  fair  value  recognition  provisions  of  Financial  Accounting  Standards  Board  Accounting  Standards  Codification,  or  ASC,
Topic 718, Compensation—Stock Compensation (“ASC 718”), to account for stock-based compensation. We recognize compensation costs related to stock
options granted based on the estimated fair value of the awards on the date of grant. Described below is the methodology we have utilized in measuring
stock-based compensation expense.

ASC 718 requires all stock-based payments, including grants of stock options and restricted stock, to be recognized in the statements of operations
based on their grant-date fair values. Compensation expense is recognized on a straight-line basis based on the grant-date fair value over the associated
service period of the award, which is generally the vesting term.

Determining the amount of stock-based compensation to be recorded requires us to develop estimates of the fair value of stock-based awards as of
their  measurement  date.  We  recognize  stock-based  compensation  expense  over  the  requisite  service  period,  which  is  the  vesting  period  of  the  award.
Calculating the fair value of stock-based awards requires that we make assumptions. We use the Black-Scholes option pricing model to value our stock
option awards. Use of this valuation methodology requires that we make assumptions as to the volatility of our common stock, the risk-free interest rate for
a period that approximates the expected term of our stock options and our expected dividend yield. Once our own sufficient historical volatility data was
obtained, we eliminated the use of a representative peer group and as of Q4 2021 we use only our own historical volatility data in its estimate of expected
volatility given that there is now sufficient amount of historical information regarding the volatility of our own stock price. We use the simplified method to
calculate the expected term as prescribed by the SEC Staff Accounting Bulletin No. 107, Share-Based Payments as we do not have sufficient historical
stock  option  activity  data  to  provide  a  reasonable  basis  upon  which  to  estimate  the  expected  term  of  stock  options  granted  to  employees.  We  utilize  a
dividend  yield  of  zero  based  on  the  fact  that  we  have  never  paid  cash  dividends  and  have  no  current  intention  of  paying  cash  dividends.  The  risk-free
interest rate used for each grant is based on the U.S. Treasury yield curve in effect at the time of grant for instruments with a similar expected life.

Results of Operations

Years Ended December 31, 2023, 2022 and 2021

(in thousands)
Product revenue, net
Expenses

Cost of goods sold
Research and development
Selling, general and administrative
Litigation settlement

Total operating expenses
Loss from operations

Other income (expense)

Gain from sale of priority review voucher
Interest and other income, net
Interest expense

Income (loss) before income taxes
Income tax expense

Net income (loss)

Product Revenue, net

Years Ended December 31,

Change

2023

2022

2021

2023 vs.
2022

2022 vs.
2021

$

50,699  $

—  $

—  $

50,699  $

— 

3,094 
46,431 
98,401 
12,500 
160,426 
(109,727)

100,000 
22,624 
— 
12,897 
(1,965)
10,932  $

$

— 
42,461 
77,735 
25,000 
145,196 
(145,196)

— 
5,221 
— 
(139,975)
— 

(139,975) $

— 
27,884 
40,391 
— 
68,275 
(68,275)

3,094 
3,970 
20,666 
(12,500)
15,230 
35,469 

— 
197 
(1,492)
(69,570)
— 
(69,570) $

100,000 
17,403 
— 
152,872 
(1,965)
150,907  $

— 
14,577 
37,344 
25,000 
76,921 
(76,921)

— 
5,024 
1,492 
(70,405)
— 
(70,405)

Product revenue, net was $50.7 million for the year ended December 31, 2023 as compared to zero for the years ended December 31, 2022 and
2021 due to initial sales of VYJUVEK after FDA approval was obtained on May 19, 2023. To date, all of our product revenue has been generated in the
United States.

Cost of Goods Sold

Cost of goods sold was $3.1 million for the year ended December 31, 2023 as compared to zero for the years ended December 31, 2022 and 2021

due to initial sales of VYJUVEK after FDA approval was obtained on May 19, 2023. Prior to

76

 
receiving FDA approval for VYJUVEK in May 2023, costs associated with the manufacturing of VYJUVEK were expensed as research and development
expense. As such, a portion of the cost of inventory sold during 2023 was expensed prior to FDA approval.

Research and Development Expenses

Research  and  development  expenses  increased  approximately  $4.0  million  for  the  year  ended  December  31,  2023  compared  to  the  year  ended
December  31,  2022.  Higher  research  and  development  expenses  were  due  to  increases  in  payroll  related  expenses  of  $5.8  million  which  was  primarily
driven by an increase in personnel to support overall growth and includes a $2.2 million increase in stock-based compensation, an increase in depreciation
of  $2.2  million,  and  an  increase  in  other  research  and  development  expenses  of  approximately  $428  thousand,  primarily  due  to  increases  in  facilities
expenses.  These  increases  were  partially  offset  by  decreases  of  $2.0  million  in  preclinical,  clinical  and  pre-commercial  manufacturing  due  to  the  costs
related  to  the  manufacturing  of  VYJUVEK  following  FDA  approval  being  recorded  as  inventory  and  due  to  fewer  receipts  of  raw  materials  and  lab
supplies period over period that were purchased for planned manufacturing runs of our products, a decrease from overhead allocations to inventory of $1.3
million, and a decrease from outsourced research and development costs of $1.2 million.

Research  and  development  expenses  increased  $14.6  million  for  the  year  ended  December  31,  2022  compared  to  the  year  ended  December  31,
2021.  Higher  research  and  development  expenses  were  due  to  increases  in  payroll  related  expenses  of  $8.9  million  which  was  primarily  driven  by  an
increase in personnel to support overall growth and includes a $4.5 million increase in stock-based compensation, an increase in outsourced research and
development activities of $2.3 million, an increase in preclinical, clinical and pre-commercial manufacturing activities of $1.0 million, and an increase in
other research and development expenses of $2.4 million, primarily due to increases in depreciation and licensing fees.

The following table summarizes our research and development expenses by product candidate or program, and for unallocated expenses, by type,

for the years ended December 31, 2023, 2022 and 2021:

(in thousands)

(1)

KB103
KB105
KB407
KB301
KB707
Other dermatology programs
Other respiratory programs
Other aesthetics programs
Other research programs
Other development programs
Stock-based compensation
Other unallocated manufacturing expenses
Other unallocated expenses
Research and development expense

(3)

(2)

Years Ended December 31,

Change

2023

2022

2021

2023 vs.
2022

2022 vs.
2021

$

$

9,039  $
282 
1,668 
460 
3,828 
2 
1,043 
91 
638 
939 
10,051 
12,550 
5,840 
46,431

$

8,096  $
276 
1,895 
1,312 
400 
500 
972 
114 
876 
645 
7,897 
15,036 
4,442 
42,461

$

6,204  $
74 
987 
1,217 
— 
789 
280 
16 
799 
708 
3,435 
9,207 
4,168 
27,884

$

943
6
(227)
(852)
3,428
(498)
71
(23)
(238)
294
2,154
(2,486)
1,398
3,970

$

$

1,892
202
908
95
400
(289)
692
98
77
(63)
4,462
5,829
274
14,577

(1) For the year ended December 31, 2023, KB103 expenses consist of pre-approval activity costs, post marketing study costs and overseas preclinical and clinical trial

costs, licensing and regulatory costs.

(2) Unallocated  manufacturing  expenses  consist  of  shared  pre-commercial  manufacturing  costs,  primarily  relating  to  raw  materials,  contract  manufacturing,  contract
testing,  process  development,  quality  control  and  quality  assurance  activities  and  other  manufacturing  costs  which  support  the  development  of  multiple  product
candidates in our preclinical and clinical development programs.

(3) Other unallocated expenses include rental, storage, depreciation, and other facility related costs that we do not allocate to our individual product candidates.

As noted above, research and development expenses increased approximately $4.0 million in the year ended December 31, 2023 compared to the
year  ended  December  31,  2022.  Expenses  for  KB103  increased  $943  thousand  due  to  increased  payroll  related  expenses  to  support  VYJUVEK’s  pre-
approval activities, clinical trial costs, license and regulatory costs, costs associated with overseas clinical trials and regulatory agency filings, and increased
allocated research and

77

development expenses. KB707 spending increased $3.4 million due to increased payroll related costs and increased contract research costs in preparation
for  the  Phase  1  clinical  trial.  Stock-based  compensation  increased  $2.2  million  due  to  an  increase  in  internal  resources  to  support  overall  research  and
development  growth.  Additionally,  other  unallocated  expenses  increased  by  $1.4  million  primarily  due  to  increases  in  depreciation  expense  offset  by  a
decrease from rent expense allocated to inventory. These increases were partially offset by a decrease in other unallocated manufacturing expenses of $2.5
million due to the costs related to the manufacturing of VYJUVEK following FDA approval being recorded as inventory and due to fewer receipts of raw
materials period over period that were purchased for planned manufacturing runs of our products and product candidates, a decrease in KB301 expenses of
$852 thousand due to the timing of clinical research costs, and a decrease in spending on other dermatology programs of $498 thousand due to a reduction
in contract manufacturing expenses.

Research and development expenses increased $14.6 million  in  the  year  ended  December  31,  2022  compared  to  the  year ended December 31,
2021. Expenses for KB103 increased $1.9 million primarily due to increased payroll expenses and clinical trial costs related to OLE studies. Expenses for
KB407  increased  $908  thousand  due  to  increased  payroll  expenses  and  pre-clinical  costs.  Other  respiratory  expenses  increased  $692  thousand  due  to
increased contract research costs. Expenses for KB707 increased $400 thousand primarily related to payroll supporting initial research activities. Stock-
based compensation increased due to an increase of $4.5 million in internal resources to support overall research and development growth. Unallocated
manufacturing expenses increased by $5.8 million primarily due to receipts of raw materials purchased for planned manufacturing runs our products.

Selling, General and Administrative Expenses

Selling,  general  and  administrative  expenses  increased  $20.7  million  for  the  year  ended  December  31,  2023  compared  to  the  year  ended
December  31,  2022.  Higher  selling,  general  and  administrative  spending  was  due  largely  to  increased  payroll  related  expenses  of  approximately  $15.1
million which is primarily driven by an increase in personnel to support overall growth and includes an approximate $4.5 million increase in stock-based
compensation, increased selling expenses related to the launch of VYJUVEK of $1.7 million, increased information technology infrastructure costs of $2.1
million, increased software-related costs of $1.3 million, increased travel costs of $1.1 million, an increase in sponsorships of $425 thousand, an increase in
net legal costs of $381 thousand, which consists of a decrease in litigation proceeds of $570 thousand, offset by a decrease in legal and professional fees of
$189 thousand and an increase of other selling, general and administrative expense of $676 thousand, primarily due to increases in depreciation and rent
expense. These increases were partially offset by a decrease of $1.2 million of commercial preparedness expenses, a decrease in medical affairs costs of
$466 thousand, and a decrease in business development costs of $428 thousand.

General  and  administrative  expenses  increased  $37.3  million  for  the  year  ended  December  31,  2022  compared  to  the  year  ended  December  31,
2021. Higher general and administrative spending was due largely to increased payroll related expenses of approximately $28.8 million which is primarily
driven by an increase in personnel to support overall growth and includes an approximate $13.4 million increase in stock-based compensation, increased
commercial  preparedness  expenses  of  approximately  $5.7  million,  increased  medical  affairs  costs  of  $581  thousand,  increased  travel  costs  of  $536
thousand,  and  an  increase  in  other  administrative  expenses  of  $2.9  million,  primarily  due  to  increases  in  utilities,  information  technology  costs,  and
conference fees. These increases were partially offset by a decrease in net legal costs of $1.2 million, which consists of a decrease in legal and professional
fees of $2.8 million offset by a decrease in litigation proceeds of approximately $1.6 million, due primarily to the settlement of the PeriphaGen litigation.

Litigation Settlement

Litigation  settlement  for  the  years  ended  December  31,  2023  and  2022  was  $12.5  million  and  $25.0  million,  respectively,  and  consisted  of
amounts  related  to  the  settlement  of  litigation  with  PeriphaGen.  See  "Legal  Proceedings"  in  Note  7  of  the  notes  to  consolidated  financial  statements
included in this Form 10-K for more information.

Gain from sale of Priority Review Voucher

Gain from sale of priority review voucher for the year ended December 31, 2023 was $100.0 million related to the sale of our rare pediatric PRV,

which was awarded to the Company in connection with the FDA’s approval of VYJUVEK.

Other Income (Expense)

Interest  and  other  income  for  the  years  ended  December  31,  2023,  2022,  and  2021  was  $22.6  million,  $5.2  million  and  $197  thousand,

respectively, and consisted of realized gains from maturities of our investments, interest income earned from our cash, cash equivalents and investments.

Interest expense for the years ended December 31, 2023, 2022 and 2021 was zero, zero, and $1.5 million, respectively. The 2021 interest expense

related to accretion of the financial obligation for the build to suit lease liability during the year ended December 31, 2021.

78

Income Tax Expense

Income tax expense for the years ended December 31, 2023, 2022, and 2021 was $2.0 million, zero, and zero, respectively. In 2023, income tax
expense related to U.S. state and federal taxes related to the PRV sale and our initial commercial activities in those jurisdictions. See Note 11 of the notes to
consolidated financial statements included in this Form 10-K for more information.

Liquidity and Capital Resources

Overview

On December 31, 2023, our cash, cash equivalents and short-term investments balance was approximately $532.2 million. Since operations began,
we have incurred operating losses. Net income was $10.9 million for the year ended December 31, 2023, and our net losses were $140.0 million and $69.6
million for the years ended December 31, 2022, and 2021, respectively. At December 31, 2023, we had an accumulated deficit of $269.8 million. With the
net  proceeds  raised  from  our  previous  public  and  private  offerings  and  sale  of  the  PRV,  we  believe  that  our  cash,  cash  equivalents  and  short-term
investments will be sufficient to allow us to fund our operations for at least 12 months from the filing date of this Form 10-K.

Our  transition  to  operating  profitability  is  dependent  upon  the  continued  successful  commercialization  of  VYJUVEK  and  the  successful
development, approval and commercialization of our product candidates and the achievement of a level of revenue adequate to support our cost structure.
Furthermore, we expect to incur increasing costs associated with satisfying regulatory and quality standards, maintaining product and clinical trials, and
furthering our efforts around our current and future product candidates. We intend to fund future operations through on hand cash and cash equivalents,
revenue  generated  from  the  sale  of  VYJUVEK,  the  sale  of  equity,  debt  financings,  and  we  may  also  seek  additional  capital  through  arrangements  with
strategic partners or other sources.

Costs  related  to  clinical  trials  can  be  unpredictable  and  therefore  there  can  be  no  guarantee  that  we  will  have  sufficient  capital  to  fund  our
continued  clinical  studies  of  KB105,  KB407,  KB301,  KB707  or  our  planned  clinical  and  preclinical  studies  for  our  other  product  candidates,  or  our
operations. Further, we expect future revenue to fluctuate between periods for many reasons, including the uncertain timing and amount of any product
sales. While we are in the process of building out our internal vector manufacturing capacity, some of our manufacturing activities will be contracted out to
third parties. Additionally, we currently utilize third-party contract research organizations to carry out some of our clinical development activities. As we
seek to obtain regulatory approval for our product candidates, we expect to continue to incur significant manufacturing and commercialization expenses as
we  prepare  for  product  sales,  marketing,  commercial  manufacturing,  packaging,  labeling  and  distribution.  Furthermore,  pursuant  to  our  settlement
agreement  with  PeriphaGen,  we  will  be  required  to  pay  three  $12.5  million  contingent  milestone  payments  upon  reaching  $100.0  million  in  total
cumulative sales, $200.0 million in total cumulative sales and $300.0 million in total cumulative sales. Our funds may not be sufficient to enable us to
conduct  pivotal  clinical  trials  for,  seek  marketing  approval  for  or  commercial  launch  of  KB104,  KB105,  KB407,  KB408,  KB301,  KB707  or  any  other
product candidate. Accordingly, to obtain marketing approval for and to commercialize these or any other product candidates, we may be required to obtain
further funding through public or private equity offerings, debt financings, collaboration and licensing arrangements or other sources. Adequate additional
financing may not be available to us on acceptable terms, if at all. Our failure to raise capital when needed could have a negative effect on our financial
condition and our ability to pursue our business strategy.

Operating Capital Requirements

Our primary uses of capital are, and we expect will continue to be for the near future, compensation and related expenses, manufacturing costs for
preclinical and clinical materials, regulatory expenses, third-party clinical trial research and development services, laboratory and related supplies, selling
expenses,  costs  to  manufacture  our  commercial  product,  legal  expenses,  payments  of  settlement  amounts  to  PeriphaGen  and  general  overhead  costs.  In
order  to  complete  the  process  of  obtaining  regulatory  approval  for  any  of  our  product  candidates  and  to  build  the  sales,  manufacturing,  marketing  and
distribution infrastructure that we believe will be necessary to commercialize our product candidates, if approved, we may require substantial additional
funding.

We  have  based  our  projections  of  operating  capital  requirements  on  assumptions  that  may  prove  to  be  incorrect,  and  we  may  use  all  of  our
available  capital  resources  sooner  than  we  expect.  Because  of  the  numerous  risks  and  uncertainties  associated  with  research,  development  and
commercialization  of  pharmaceutical  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 costs needed to commercialize and market our lead product, VYJUVEK;

the progress, timing and costs of clinical trials of our current product candidates;

79

•

•

•

•

•

•

•

•

•

•

•

•

•

•

the progress, timing and costs of manufacturing of VYJUVEK and revenue received from commercial sale of VYJUVEK;

the continued development and the filing of an IND application for current and future product candidates;

the initiation, scope, progress, timing, costs and results of drug discovery, laboratory testing, manufacturing, preclinical studies and clinical trials
for any product candidates that we may pursue in the future, if any;

the costs of maintaining our own commercial-scale CGMP manufacturing facilities;

the outcome, timing and costs of seeking regulatory approvals;

the costs associated with the manufacturing process development and evaluation of third-party manufacturers;

the extent to which the costs of VYJUVEK and our product candidates, if approved, will be paid by health maintenance, managed care, pharmacy
benefit and similar healthcare management organizations, or will be reimbursed by government authorities, private health coverage insurers and
other third-party payors;

the  costs  of  commercialization  activities  for  our  current  and  future  product  candidates  if  we  receive  marketing  approval  for  such  product
candidates, including the costs and timing of establishing product sales, medical affairs, marketing, distribution and manufacturing capabilities;

subject to receipt of marketing approval, if any, revenue received from commercial sale of our current and future product candidates;

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

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

our current license agreements remaining in effect and our achievement of milestones under those agreements;

our ability to establish and maintain collaborations and licenses on favorable terms, if at all; and

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

We may need to obtain substantial additional funding in order to receive regulatory approval and to commercialize our product candidates. To the
extent that we raise additional capital through the sale of common stock, convertible securities or other equity securities, the ownership interests of our
existing stockholders may be materially diluted and the terms of these securities could include liquidation or other preferences that could adversely affect
the  rights  of  our  existing  stockholders.  In  addition,  debt  financing,  if  available,  would  result  in  increased  fixed  payment  obligations  and  may  involve
agreements that include restrictive covenants that limit our ability to take specific actions, such as incurring additional debt, making capital expenditures or
declaring dividends, that could adversely affect our ability to conduct our business. If we are unable to raise capital when needed or on attractive terms, we
could be forced to significantly delay, scale back or discontinue the development or commercialization of our product candidates, seek collaborators at an
earlier stage than otherwise would be desirable or on terms that are less favorable than might otherwise be available, and relinquish or license, potentially
on unfavorable terms, our rights to our product candidates that we otherwise would seek to develop or commercialize ourselves.

Contractual Obligations

Operating Leases

Operating lease payments represent our commitments for future minimum rent made under non-cancelable leases for our corporate headquarters in
Pittsburgh, Pennsylvania, office location in Boston, Massachusetts, office locations in Switzerland and Netherlands, and for the ground lease associated
with  our  second  CGMP  manufacturing  facility,  ASTRA.  The  total  future  payments  for  our  operating  lease  obligations  at  December  31,  2023  are  $16.2
million, of which $1.5 million is due in the next twelve months and the remaining payments are due over the terms of the respective leases. For additional
details regarding our leases, see Note 8 to our consolidated financial statements included in this Annual Report on Form 10-K.

Clinical Supply and Product Manufacturing Agreements

We  enter  into  various  agreements  in  the  normal  course  of  business  with  CROs,  CMOs  and  other  third  parties  for  preclinical  research  studies,
clinical  trials  and  testing  and  manufacturing  services.  We  are  obligated  to  make  milestone  payments  under  certain  of  these  agreements.  The  estimated
remaining  commitment  as  of  December  31,  2023  under  these  agreements  is  approximately  $1.7  million,  all  of  which  is  expected  to  be  due  in  the  next
twelve months.

80

ASTRA Contractual Obligations

We have contracted with various third parties to complete and qualify our second CGMP facility, ASTRA. These contracts typically call for the
payment of fees for services or materials upon the achievement of certain milestones. The estimated remaining commitment as of December 31, 2023 is
$8.2 million, all of which is expected to be due in the next twelve months.

Cash Flows

The following table summarizes our sources and uses of cash (in thousands):

Net cash used in operating activities
Net cash provided by (used in) investing activities
Net cash provided by financing activities
Effect of exchange rate changes on cash and cash equivalents
Net change in cash

Operating Activities

Years Ended December 31,

2023

(88,804) $
82,638 
202,750 
(156)
196,428  $

2022
(100,569) $
(114,083)
35,347 
(41)
(179,346) $

$

$

2021

(47,938)
(226,770)
347,685 
— 
72,977 

Net cash used in operating activities for the year December 31, 2023 was $88.8 million and consisted primarily of net income of $10.9 million
adjusted for non-cash items of $61.9 million primarily comprised of a gain on sale of the rare pediatric PRV of $100.0 million, stock-based compensation
expense  of  $39.9  million,  realized  gain  on  investments  of  $5.1  million,  depreciation  and  amortization  of  $3.7  million,  other  non-cash  items  of  $451
thousand, and cash used by increases in net working capital of approximately $37.9 million.

Net cash used in operating activities for the year December 31, 2022 was $100.6 million and consisted primarily of a net loss of $140.0 million
adjusted for non-cash items of $36.6 million primarily made up of stock-based compensation expense of $33.2 million and depreciation and amortization of
$4.1 million, and cash provided by decreases in net working capital of approximately $2.8 million.

Net  cash  used  in  operating  activities  for  the  year  December  31,  2021  was  $47.9  million  and  consisted  primarily  of  a  net  loss  of  $69.6  million
adjusted for non-cash items of $19.1 million primarily made up of stock-based compensation expense of $15.3 million, depreciation and amortization of
$2.8 million and build to suit interest expense of $1.5 million, and cash provided by decreases in net working capital of approximately $2.5 million.

Investing Activities

Net  cash  provided  by  investing  activities  for  the  year  ended  December  31,  2023  was  approximately  $82.6  million  and  consisted  primarily  of
proceeds  of  $100.0  million  from  the  sale  of  the  rare  pediatric  PRV,  proceeds  from  maturities  of  investments  of  $503.2  million,  offset  by  purchases  of
available-for-sale  investment  securities  of  $508.8  million,  and  expenditures  of  $11.8  million  on  the  build-out  of  our  ASTRA  facility,  leasehold
improvement of new office space, and purchases of computer and laboratory equipment.

Net cash used in investing activities for the year ended December 31, 2022 was approximately $114.1 million and consisted primarily of purchases
of  $318.8  million  of  available-for-sale  investment  securities,  and  expenditures  of  $53.0  million  on  the  build-out  of  our  ASTRA  facility,  leasehold
improvement of new office space, and purchases of computer and laboratory equipment, partially offset by proceeds of $257.7 million from maturities of
investments.

Net  cash  used  in  investing  activities  for  the  year  ended  December  31,  2021  was  approximately  $226.8  million  and  consisted  primarily  of
purchases of $190.5 million of available-for-sale investment securities, and expenditures of $68.3 million on the build-out of our ASTRA facility, leasehold
improvement of new office space, and purchases of computer and laboratory equipment, partially offset by proceeds of $32.0 million from maturities of
investments.

Financing Activities

Net  cash  provided  by  financing  activities  for  the  year  ended  December  31,  2023  was  $202.8  million  and  consisted  primarily  of  proceeds  of
$160.0 million received from a private placement equity offering and proceeds of $43.5 million primarily from exercises of stock options, partially offset
by $749 thousand used for the employee tax withholding payment for settlement of vested restricted stock awards.

81

 
 
Net cash provided by financing activities for the year ended December 31, 2022 was $35.3 million and was primarily from proceeds from public
offerings  of  434,782  shares  of  our  common  stock  at  a  weighted  average  price  of  $69.00  per  share  through  our  at-the-market  equity  offering  program
(“ATM”) Program. Our net proceeds from the offerings were $29.1 million after deducting underwriting discounts and commissions of approximately $900
thousand. Additionally, we received $7.0 million of proceeds related to the exercise and settlement of employee stock options and restricted stock awards,
offset by $649 thousand of taxes paid for the settlement of restricted stock awards.

Net cash provided by financing activities for the year ended December 31, 2021 was $347.7 million and was primarily from proceeds from follow
on public offerings of 2,211,538 shares of our common stock, including 288,461 shares purchased by the underwriters, at $65.00 per share and 2,866,667
shares of our common stock, including 200,000 shares purchased by the underwriters, at $75.00 per share. Our net proceeds from the offerings were $336.8
million after deducting underwriting discounts and commissions of approximately $21.5 million, and other offering expenses payable of $425 thousand.

Recent Accounting Pronouncements

See note 2 to our consolidated financial statements.

82

Item 7A. Qualitative and Quantitative Disclosures About Market Risk

We had cash, cash equivalents and short-term investments of approximately $532.2 million as of December 31, 2023, which consist primarily of
money market funds, commercial paper, corporate bonds, and government agency securities. The investments in these financial instruments are made in
accordance with an investment policy which specifies the categories, allocations and ratings of securities we may consider for investment. The primary
objective of our investment activities is to preserve principal while at the same time maximizing the income we receive without significantly increasing
risk. Some of the financial instruments in which we invest could be subject to market risk. This means that a change in prevailing interest rates may cause
the value of the instruments to fluctuate. For example, if we purchase a security that was issued with a fixed interest rate and the prevailing interest rate
later  rises,  the  value  of  that  security  will  probably  decline.  To  minimize  this  risk,  we  intend  to  maintain  a  portfolio  which  may  include  cash,  cash
equivalents and short-term investment securities available-for-sale in a variety of securities which may include money market funds, government and non-
government debt securities and commercial paper, all with various maturity dates. Based on our current investment portfolio, we do not believe that our
results of operations or our financial position would be materially affected by an immediate change of 10% in interest rates.

As of December 31, 2023, we have established operations in Europe and Australia and hold cash in Swiss Francs, Euros, and Australian Dollars.
We are subject to foreign exchange rate risk arising from transactions conducted in the aforementioned foreign currencies, however our foreign operations
are  not  currently  material  to  our  business.  We  do  not  believe  that  our  results  of  operations  or  our  financial  position  would  be  materially  affected  by  an
immediate change of 10% in foreign currency exchange rates.

We do not hold or issue derivatives, derivative commodity instruments or other financial instruments for speculative trading purposes. Further, we
do  not  believe  our  cash,  cash  equivalents  and  short-term  investments  have  significant  risk  of  default  or  illiquidity.  While  we  believe  our  cash,  cash
equivalents and short-term investments do not contain excessive risk, we cannot provide absolute assurance that any investments we make in the future will
not be subject to adverse changes in market value. Our cash, cash equivalents and short-term investments are recorded at fair value.

83

Item 8. Financial Statements and Supplementary Data.

INDEX TO FINANCIAL STATEMENTS

Reports of Independent Registered Public Accounting Firms (KPMG, LLP, Pittsburgh, PA (US Firm), PCAOB ID No. 185) (Mayer Hoffman
McCann P.C., San Diego, CA, PCAOB ID No. 199)

Consolidated Balance Sheets as of December 31, 2023 and December 31, 2022

Consolidated Statements of Operations and Comprehensive Income (Loss) for the Years Ended December 31, 2023, December 31, 2022, and
December 31, 2021

Consolidated Statements of Stockholders’ Equity for the Years Ended December 31, 2023, December 31, 2022, and December 31, 2021

Consolidated Statements of Cash Flows for the Years Ended December 31, 2023, December 31, 2022, and December 31, 2021

Notes to Consolidated Financial Statements

F-2

F-4

F-5

F-6

F-7

F-8

F-1

 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors
Krystal Biotech, Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Krystal Biotech, Inc. and subsidiaries (the Company) as of December 31,
2023 and 2022, the related consolidated statements of operations and comprehensive income (loss), stockholders’ equity, and cash flows for
each of the years in the two-year period ended December 31, 2023, and the related notes (collectively, the consolidated financial
statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company
as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the years in the two-year period ended
December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the
Company’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 26,
2024 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on
these consolidated financial statements based on our audits. We are a public accounting firm registered with the 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 consolidated financial statements are free of material misstatement, whether due to error or
fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements,
whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis,
evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting
principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial
statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

Critical audit matters are matters arising from the current period audit of the consolidated financial statements that were communicated or
required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the consolidated
financial statements and (2) involved our especially challenging, subjective, or complex judgments. We determined that there are no critical
audit matters.

We have served as the Company’s auditor since 2022.

Pittsburgh, Pennsylvania
February 26, 2024

/s/ KPMG LLP

F-2

Report of Independent Registered Public Accounting Firm

To the Board of Directors and
Stockholders of Krystal Biotech, Inc.:

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of operations and comprehensive loss, stockholders’ equity and cash flows of
Krystal Biotech, Inc. (the “Company”) for the year 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 results of the Company’s operations and their
cash  flows  for  the  year  ended  December  31,  2021,  in  conformity  with  accounting  principles  generally  accepted  in  the  United  States  of
America.

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  audit.  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  audit  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. Our
audit 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  included  examining,  on  a  test  basis,  evidence  regarding  the
amounts  and  disclosures  in  the  financial  statements.  Our  audit  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  audit
provides a reasonable basis for our opinion.

We have served as the Company's auditor since 2017, which ended in 2022.

/s/ Mayer Hoffman McCann P.C.
San Diego, California
February 28, 2022

F-3

(In thousands, except shares and par value data)

Assets
Current assets

Cash and cash equivalents
Short-term investments
Accounts receivable, net
Inventory
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Long-term investments
Right-of-use assets
Other non-current assets
Total assets

Liabilities and Stockholders' Equity
Current liabilities

Accounts payable
Current portion of lease liability
Accrued expenses and other current liabilities

Total current liabilities

Lease liability

Total liabilities

Commitments and contingencies (Note 7)
Stockholders' equity

Krystal Biotech, Inc.
Consolidated Balance Sheets

December 31,
2023

December 31,
2022

$

$

$

$

358,328  $
173,850 
42,040 
6,985 
6,706 
587,909 
161,202 
61,954 
7,027 
263 
818,355  $

4,132  $
1,474 
27,488 
33,094 
6,620 
39,714 

161,900 
217,271 
— 
— 
4,608 
383,779 
161,684 
4,621 
8,042 
324 
558,450 

3,981 
1,561 
23,305 
28,847 
7,372 
36,219 

— 
1,047,830 
638 
(269,827)
778,641 
818,355  $

— 
803,718 
(728)
(280,759)
522,231 
558,450 

Common stock; $0.00001 par value; 80,000,000 shares authorized at December 31,

2023 and 2022; 28,236,673 and 25,763,743 shares issued and outstanding at December 31, 2023 and
2022, respectively

Additional paid-in capital
Accumulated other comprehensive gain (loss)
Accumulated deficit

Total stockholders' equity
Total liabilities and stockholders' equity

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

F-4

 
 
 
Krystal Biotech, Inc.
Consolidated Statements of Operations and Comprehensive Income (Loss)

(In thousands, except share and per share data)
Product revenue, net
Expenses

Cost of goods sold
Research and development
Selling, general and administrative
Litigation settlement

Total operating expenses
Loss from operations

Other income (expense)

Gain from sale of priority review voucher
Interest and other income, net
Interest expense

Income (loss) before income taxes
Income tax expense
Net income (loss)
Unrealized income (loss) on available-for-sale securities and other

Comprehensive income (loss)

Net income (loss) per common share:
Basic
Diluted

Weighted-average common shares outstanding:
Basic
Diluted

2023

Year Ended
December 31,

2022

2021

$

50,699  $

—  $

3,094 
46,431 
98,401 
12,500 
160,426 
(109,727)

100,000 
22,624 
— 
12,897 
(1,965)
10,932 
1,366 
12,298  $

— 
42,461 
77,735 
25,000 
145,196 
(145,196)

— 
5,221 
— 
(139,975)
— 
(139,975)
(565)
(140,540) $

0.40  $
0.39  $

(5.49) $
(5.49) $

$

$
$

— 

— 
27,884 
40,391 
— 
68,275 
(68,275)

— 
197 
(1,492)
(69,570)
— 
(69,570)
(169)
(69,739)

(3.13)
(3.13)

27,154,190 
27,751,809 

25,491,721 
25,491,721 

22,196,846 
22,196,846 

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

F-5

 
(In thousands, except shares)

Balances at January 1, 2021

Issuance of common stock, net
Stock-based compensation expense
Unrealized loss on investments and other (1)
Net loss
Balances at December 31, 2021

Issuance of common stock, net
Shares surrendered for taxes and forfeitures
Stock-based compensation expense
Unrealized loss on investments and other (1)
Net loss
Balances at December 31, 2022

Issuance of common stock, net
Shares surrendered for taxes
Stock-based compensation expense
Unrealized gain on investments and other (1)
Net income

Krystal Biotech, Inc.
Consolidated Statements of Stockholders' Equity

Common Stock

Shares

Amount

Additional
Paid-in
Capital

Accumulated
Other
Comprehensive
Income (Loss)

Accumulated
Deficit

Total
Stockholders'
Equity

$

$

$

19,714,220 
5,493,765 
—
—
—

25,207,985 
573,637 
(17,879)
— 
— 
— 

25,763,743 
2,482,481 
(9,551)
— 
— 
— 

— 
— 
—
—
—

— 
— 
— 
— 
— 
— 

— 
— 
— 
— 
— 
— 

— 

$

$

$

$

$

$

363,292 
355,628 
15,603 
—
—

734,523 
36,063 
(649)
33,781 
— 
— 

803,718 
203,682 
(749)
41,179 
— 
— 

$

$

$

6 
—
—
(169)
—

(163)
— 
— 
— 
(565)
— 

(728)
— 
— 
— 
1,366 
— 

$

$

$

(71,214)
—
—
—
(69,570)

(140,784)
— 
— 
— 
— 
(139,975)

(280,759)
— 
— 
— 
— 
10,932 

$

1,047,830 

$

638 

$

(269,827)

$

292,084 
355,628 
15,603 
(169)
(69,570)

593,576 
36,063 
(649)
33,781 
(565)
(139,975)

522,231 
203,682 
(749)
41,179 
1,366 
10,932 

778,641 

Balances at December 31, 2023

28,236,673 

$

(1)

Includes foreign currency translation losses of $66 thousand and $78 thousand, and a gain of $7 thousand for the years ended December 31, 2023, 2022, and 2021,
respectively.

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

F-6

 
 
 
 
 
 
Krystal Biotech, Inc.
Consolidated Statements of Cash Flows

(In thousands)
Operating Activities
Net income (loss)
Adjustments to reconcile net income (loss) to net cash used in operating activities

Years Ended December 31,

2023

2022

2021

$

10,932  $

(139,975) $

(69,570)

Gain from sale of priority review voucher
Depreciation
(Accretion) amortization
Stock-based compensation expense
Loss on disposal of fixed assets
Non-cash interest expense
Realized gain on investments
Other, net
Changes in operating assets and liabilities

Accounts receivable
Inventory
Prepaid expenses and other current assets
Other non-current assets
Lease liability
Accounts payable
Accrued rebates
Accrued expenses and other current liabilities

Net cash used in operating activities

Investing Activities
Proceeds from sale of priority review voucher
Purchases of property and equipment
Purchases of investments
Maturities of investments

Net cash provided by (used in) investing activities

Financing Activities
Issuance of common stock, net of issuance costs
Taxes paid related to settlement of restricted stock awards
Repayment of ASTRA build-to-suit liability

Net cash provided by financing activities

Effect of exchange rate changes on cash and cash equivalents

(100,000)
5,007 
(1,278)
39,933 
27 
— 
(5,092)
(451)

(42,040)
(4,475)
(908)
(64)
(829)
(101)
5,977 
4,558 
(88,804)

100,000 
(11,799)
(508,776)
503,213 
82,638 

203,499 
(749)
— 
202,750 

(156)

— 
2,643 
1,412 
33,230 
72 
— 
(570)
(192)

— 
— 
(311)
(150)
(647)
(1,254)
— 
5,173 
(100,569)

— 
(52,979)
(318,781)
257,677 
(114,083)

35,996 
(649)
— 
35,347 

(41)

Net change in cash and cash equivalents

196,428 

(179,346)

— 
1,849 
920 
15,319 
— 
1,492 
— 
(454)

— 
— 
(691)
65 
(285)
712 
— 
2,705 
(47,938)

— 
(68,336)
(190,462)
32,028 
(226,770)

355,645 
— 
(7,960)
347,685 

— 

72,977 

268,269 
341,246 

Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year

Supplemental Disclosures of Non-Cash Investing and Financing Activities
Unpaid purchases of property and equipment
Initial recognition of right-of-use assets

$

$
$

161,900 
358,328  $

341,246 
161,900  $

8,602  $
—  $

14,927  $
1,556  $

15,363 
4,396 

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

F-7

 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements

1.    Organization

Krystal Biotech, Inc. (the “Company,” or “we” or other similar pronouns) commenced operations in April 2016. In March 2017, the Company
converted from a California limited liability company to a Delaware C-corporation, and changed its name from Krystal Biotech LLC to Krystal Biotech,
Inc.  In  June  2018,  the  Company  incorporated  a  wholly-owned  subsidiary  in  Australia  for  the  purpose  of  undertaking  preclinical  and  clinical  studies  in
Australia. In April 2019, the Company incorporated Jeune Aesthetics, Inc (“Jeune Aesthetics”), in Delaware, a wholly-owned subsidiary, for the purpose of
undertaking preclinical and clinical studies for aesthetic skin conditions. In January 2022, August 2022, December 2022, and August 2023, the Company
incorporated wholly-owned subsidiaries in Switzerland, Netherlands, France, and Germany respectively, for the purpose of establishing initial operations in
Europe for the commercialization of the Company’s product pipeline.

We  are  a  fully  integrated,  commercial-stage  biotechnology  company  focused  on  the  discovery,  development,  and  commercialization  of  genetic
medicines to treat diseases with high unmet medical needs. Our first commercial product, VYJUVEK , was approved by the FDA on May 19, 2023 for the
treatment of DEB, and we subsequently initiated our U.S. commercial launch. VYJUVEK is the first medicine approved by the FDA for the treatment of
DEB.

®

Using  our  patented  gene  therapy  technology  platform  that  is  based  on  engineered  HSV-1,  we  create  vectors  that  efficiently  deliver  therapeutic
transgenes to cells of interest in multiple organ systems. The cell’s own machinery then transcribes and translates the encoded effector to treat or prevent
disease. We formulate our vectors for non-invasive or minimally invasive routes of administration at a healthcare professional’s office or in the patient’s
home by a healthcare professional. Our goal is to develop easy-to-use medicines to dramatically improve the lives of patients living with rare and serious
diseases.  Our  innovative  technology  platform  is  supported  by  an  in-house,  FDA-inspected  commercial  scale  Current  Good  Manufacturing  Practice
(“CGMP”) manufacturing facility and a second, completed and qualified, commercial scale CGMP facility to support future expansion.

Liquidity

As of December 31, 2023, the Company had an accumulated deficit of $269.8 million. Our transition to operating profitability is dependent upon
the  continued  successful  commercialization  of  VYJUVEK  as  well  as  successful  development,  approval,  and  commercialization  of  our  other  product
candidates  and  the  achievement  of  a  level  of  revenue  adequate  to  support  the  Company’s  cost  structure.  Management  intends  to  fund  future  operations
through  its  on  hand  cash  and  cash  equivalents,  revenue  generated  from  the  sale  of  VYJUVEK,  the  sale  of  equity,  debt  financings,  and  may  also  seek
additional  capital  through  arrangements  with  strategic  partners  or  other  sources.  There  can  be  no  assurance  that  additional  funding  will  be  available  on
terms acceptable to the Company, if at all.

The  Company  is  subject  to  risks  common  to  companies  in  the  biotechnology  industry,  including  but  not  limited  to  the  failure  of  product
candidates  in  clinical  and  preclinical  studies,  the  development  of  competing  product  candidates  or  other  technological  innovations  by  competitors,
dependence  on  key  personnel,  protection  of  proprietary  technology,  compliance  with  government  regulations  and  the  ability  to  commercialize  product
candidates.  The  Company  expects  to  incur  significant  costs  to  further  its  pipeline  and  to  expand  its  commercialization  capabilities  in  advance  of  the
potential global regulatory approvals of VYJUVEK. The Company believes that its cash, cash equivalents and short-term investments of approximately
$532.2 million as of December 31, 2023 will be sufficient to allow the Company to fund its planned operations for at least the next 12 months from the
date of this Annual Report on Form 10-K.

2.    Summary of Significant Accounting Policies

Basis of Presentation

The  accompanying  consolidated  financial  statements  have  been  prepared  in  conformity  with  generally  accepted  accounting  principles  in  the
United States of America (“GAAP”). All intercompany balances and transactions have been eliminated in consolidation. Certain prior period amounts have
been reclassified to conform to the current period presentation. The reclassified amounts have no impact on the Company’s previously reported financial
position or results of operations.

Use of Estimates

The  preparation  of  consolidated  financial  statements  in  conformity  with  GAAP  requires  management  to  make  estimates  and  assumptions  that
affect the reported amounts in the consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates.
Management considers many factors in developing the estimates and

F-8

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

assumptions that are used in the preparation of these financial statements. Management must apply significant judgment in this process. In addition, other
factors  may  affect  estimates,  including:  expected  business  and  operational  changes,  sensitivity  and  volatility  associated  with  the  assumptions  used  in
developing estimates, and whether historical trends are expected to be representative of future trends. The estimation process often may yield a range of
potentially reasonable estimates of the ultimate future outcomes and management must select an amount that falls within that range of reasonable estimates.
If actual results in the future vary from the Company’s estimates, the Company will adjust these estimates in the period these variances become known.
Estimates are used in the following areas, among others: variable consideration associated with revenue recognition, stock-based compensation expense,
accrued expenses, the fair value of financial instruments, and the valuation allowance included in the deferred income tax calculation.

Segment and Geographical Information

Operating segments are defined as components of an enterprise about which separate discrete information is available for evaluation by the chief
operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company and the Company’s
chief operating decision maker view the Company’s operations and manage its business in one operating segment, which is the business of developing and
commercializing pharmaceutical products.

Cash, Cash Equivalents and Investments

Cash and cash equivalents consist of money market funds and bank deposits. Cash equivalents are defined as short-term, highly liquid investments

with original maturities of 90 days or less at the date of purchase.

Investments  with  maturities  of  less  than  one  year  are  classified  as  short-term  investments  on  the  consolidated  balance  sheets  and  consist  of
commercial paper, corporate bonds, and U.S. government agency securities. Investments with maturities of greater than one year are classified as long-term
investments on the consolidated balance sheets and consist of corporate bonds and U.S. government agency securities. Accrued interest on investments is
also classified as short-term investments.

As our entire investment portfolio is considered available for use in current operations, we classify all investments as available-for-sale securities.
Available-for-sale securities are carried at fair value, with unrealized gains and losses reported in accumulated other comprehensive gain (loss), which is a
separate component of stockholders’ equity in the consolidated balance sheets. Any premium arising at purchase is amortized to the earliest call date and
any discount arising at purchase is accreted to maturity. Amortization and accretion of premiums and discounts are recorded in interest and other income,
net in the consolidated statements of operations and comprehensive income (loss).

Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market
participants  at  the  measurement  date.  There  is  a  three-level  hierarchy  that  prioritizes  the  inputs  used  in  determining  fair  value  by  their  reliability  and
preferred use, as follows:

•

•

•

Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities.

Level 2—Valuations based on quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets
and liabilities in inactive markets, or other inputs that are observable, or can be corroborated by observable market data.

Level 3—Valuations based on inputs that are both significant to the fair value measurement and unobservable.

To the extent that a valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value
requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized
within Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value
measurement. 

There  have  been  no  significant  changes  to  the  valuation  methods  utilized  by  the  Company  during  the  periods  presented.  There  have  been  no

transfers between Level 1, Level 2, and Level 3 in any periods presented.

The carrying amounts of financial instruments consisting of cash and cash equivalents, investments, accounts receivable, net, prepaid expenses
and other current assets, accounts payable, accrued expenses and other current liabilities included in the Company’s consolidated financial statements, are
reasonable estimates of fair value, primarily due to their short maturities.

Our available-for-sale, short-term and long-term investments, which consist of commercial paper, corporate bonds, and U.S. government agency

securities are considered to be Level 2 financial instruments. The fair value of Level 2 financial assets

F-9

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

is determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing
for  similar  securities,  recently  executed  transactions,  cash  flow  models  with  yield  curves,  and  benchmark  securities.  In  addition,  Level  2  financial
instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis.

Revenue Recognition

The  Company  has  contracted  to  sell  VYJUVEK  to  a  limited  number  of  specialty  pharmacy  providers  (“SPs”)  that  mix  the  medication  and
administer  it  to  patients  in  the  patient’s  home  by  a  healthcare  professional  and  through  a  single  specialty  distributor  (“SD”)  to  hospitals  and  outpatient
clinics where patients are administered the medication at a healthcare professional’s office. The Company entered into a third-party logistics distribution
agreement to engage a logistics agent (the “3PL Agent”) to distribute the Company’s products to its customers. The 3PL Agent provides services to the
Company that include storage, shipping and distribution, processing product returns, as well as customer service, order to cash, and logistics support. The
Company and an affiliate of the 3PL Agent (the Title Company) entered into a Title Model Amendment (the Title Amendment) to the 3PL Agreement so
that the Title Company may purchase and take title to the product and sell the product to the SPs who have contracted to purchase the product from the
Company or SD who has contracted to deliver the product to our customers. Although, under the Title Amendment the Title Company takes title to the
product, the economic substance of the transaction provides that the Title Company does not possess the risk of loss or participate in the significant risks
and rewards of ownership of the product. The Title Company also lacks the ability to control, direct the use of, and obtain substantially all of the remaining
benefits  from  the  product.  Accordingly,  the  Company  does  not  recognize  revenue  on  the  transfer  of  the  goods  until  the  goods  are  sold  from  the  Title
Company to the SPs or delivered by the SD. Revenue is recognized upon transfer of control of the product to the customer.

The Company recognizes product revenue under ASC Topic 606, Revenue from Contracts with Customers (“Topic 606”). Under Topic 606, the

Company is required to complete the following five steps:

(i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price, including
variable consideration, if any; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the
entity satisfies a performance obligation.

The  Company  recognizes  revenue  when  the  customer  obtains  control  of  the  product,  which  occurs  at  a  point  in  time,  upon  delivery  to  the
customer. Sales and other taxes collected concurrent with revenue-producing activities are excluded from revenue. Revenue is measured as the amount of
consideration the Company expects to receive in exchange for transferring VYJUVEK and is generally based upon a list or fixed price less allowances for
returns, copay assistance, rebates and discounts. The Company’s payment terms are generally 80 days from the invoice date.

Variable Consideration

Product revenue, net is recorded at the net sales price, or transaction price, upon delivery and transfer of control to the customer, and includes an

estimate of variable consideration, which results from discounts, rebates, and returns that are offered within our contracts.

–

Prompt Pay Discounts: As  an  incentive  for  prompt  payment,  the  Company  offers  cash  discounts  to  its  counterparties.  The  Company  estimates
accrued prompt pay discounts using the most likely amount method. The Company expects that all eligible counterparties will comply with the
contractual  terms  to  earn  the  discount.  The  Company  records  the  discount  as  an  allowance  against  accounts  receivable,  net  and  a  reduction  of
revenue.

– Government Rebates: The Company participates in certain government rebate programs including Medicaid, Medicare and Tricare. The Company
estimates accrued government rebates using the expected value method. The Company accrues estimated rebates based on estimated percentages
of  VYJUVEK  that  will  be  prescribed  to  qualified  patients,  estimated  rebate  percentages  and  estimated  levels  of  inventory  in  the  distribution
channel that will be prescribed to qualified patients and records the rebates as a reduction of revenue. Accrued government rebates are recorded as
a reduction of revenue and are included in other accrued liabilities on the consolidated balance sheets. For Medicare, the Company also estimates
the accrued liability based on the number of patients in the prescription drug coverage gap under the Medicare Part D program.

– Commercial Rebates: The Company participates in certain commercial rebate programs. Under these rebate programs, the Company pays a rebate
to the commercial entity or third-party administrator of the program. Accrued commercial rebates are estimated using the expected value method.
The Company accrues estimated rebates based on contract prices, estimated percentages of VYJUVEK that will be prescribed to qualified patients
and estimated levels of inventory in the distribution channel. Accrued commercial rebates are recorded as a reduction of revenue and are included
in other accrued liabilities on the consolidated balance sheets.

F-10

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

– Copay Assistance: The Company provides copay assistance to qualified patients with commercial insurance in states that allow copay assistance,
helping  them  meet  copay  obligations  to  their  insurance  provider.  The  Company  reimburses  pharmacies  for  this  discount  through  third-party
vendors.  The  Company  estimates  copay  assistance  costs  using  the  expected  value  method.  The  estimate  is  based  on  contract  prices,  estimated
percentages of VYJUVEK that will be prescribed to qualified patients, average assistance paid based on reporting from third-party vendors and
estimated levels of inventory in the distribution channel. Copay assistance costs are recorded as reductions to revenue and are accrued in other
accrued liabilities on the consolidated balance sheets.

–

Product Returns: The Company offers SPs and SDs limited return rights relating only to product damage or defects identified upon receipt, and
therefore the Company expects minimal returns. Returns are estimated taking into consideration several factors including these limited product
return rights, historical return activity, and other relevant factors.. There were no returns for the year ended December 31, 2023.

Variable  consideration  is  estimated  and  reduces  the  transaction  price  to  reflect  the  Company’s  best  estimate  of  the  amount  of  consideration  to
which  the  Company  is  entitled  based  on  the  terms  of  the  contracts  and  are  recorded  in  the  same  period  the  related  product  revenue  is  recognized.  The
amount of variable consideration that is included in the transaction price may be constrained and is included in the net sales price only to the extent that it is
considered probable that a significant reversal in the amount of the cumulative revenue recognized will not occur in a future period. Actual amounts of
consideration ultimately received may differ from the Company’s estimates. If actual results in the future vary from the Company’s estimates, the Company
will adjust these estimates in the period these variances become known.

Cost of Goods Sold

Cost  of  goods  sold  includes  direct  and  indirect  costs  related  to  the  manufacturing  of  VYJUVEK.  These  costs  consist  of  manufacturing  costs,
personnel  costs  including  stock-based  compensation,  facility  costs,  and  other  indirect  overhead  costs.  Cost  of  goods  sold  may  also  include  period  costs
related to certain manufacturing services and inventory adjustment charges.

Accounts Receivable

Accounts receivable is recorded net of allowances for prompt payment discounts, returns, and credit losses. The Company estimates an allowance
for credit losses by considering factors such as credit quality, the age of the accounts receivable balances, and current economic conditions that may affect a
customer’s ability to pay. As of December 31, 2023, the credit profile for the Company’s counterparty was deemed to be in good standing, and as such an
allowance for credit losses was not recorded.

Concentration of Credit Risk and Off-Balance Sheet Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents, short-term investments, long-term
investments,  and  accounts  receivable,  net.  The  Company  maintains  its  cash  and  cash  equivalent  balances  with  high-quality  financial  institutions  and,
consequently, the Company believes that such funds are subject to minimal credit risk. The Company is exposed to credit risk in the event of default by the
financial institutions to the extent amounts recorded on the consolidated balance sheets are in excess of insured limits. The Company has not experienced
any credit losses in such accounts and does not believe it is exposed to any significant credit risk on these funds. The Company’s accounts receivable, net
and marketable securities, which primarily consist of U.S. government agency securities and treasuries, corporate bonds and commercial paper, potentially
subject the Company to concentrations of credit risk. The Company had one customer for the year ended December 31, 2023 and no product revenue for
the years ended December 31, 2022 and 2021. The Company has no financial instruments with off-balance sheet risk of loss.

Inventories

The Company capitalizes inventory costs associated with products when future economic benefit is expected to be realized. These costs consist of
raw materials, manufacturing-related costs, personnel costs including stock-based compensation, facility costs, and other indirect overhead costs. Prior to
receiving FDA approval for VYJUVEK in May 2023, the Company expensed costs related to inventory for clinical and pre-commercial purposes directly
to research and development expense. Following the FDA’s approval of VYJUVEK, the Company began capitalizing inventory related to commercialized
products held for sale, in-process of production for sale, and raw materials to be used in the manufacturing of inventory.

The Company values its inventories at the lower-of-cost and net realizable value, on a first-in, first-out (“FIFO”) basis. The Company adjusts the
net realizable value of any excess, obsolete or unsalable inventories in the period in which they are identified. For the years ended December 31, 2023,
2022, and 2021, there were no inventory write-downs. See Note 6.

F-11

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

Property and Equipment, net

Property and equipment, net, is stated at cost, less accumulated depreciation. Maintenance and repairs that do not improve or extend the lives of
the respective assets are expensed to operations as incurred, while costs of major additions and betterments are capitalized. Upon disposal, the related cost
and accumulated depreciation is removed from the accounts and any resulting gain or loss is included in the results of operations. Depreciation is recorded
using the straight-line method over the estimated useful lives of the respective assets, which are as follows:

Buildings and building improvements
Computer equipment and software
Manufacturing equipment
Laboratory equipment
Furniture and fixtures
Leasehold improvements

7 - 47 years
3 - 7 years
3 - 20 years
3 - 15 years
3 - 7 years
lesser of remaining useful life or remaining life of lease

The Company reviews the estimated useful lives of its property and equipment on a continuing basis. In evaluating the useful lives, the Company
considers  how  long  assets  will  remain  functionally  effective,  whether  the  technology  continues  to  be  relevant  and  considers  other  competitive  and
economic factors. If the assessment indicates that the assets will be used for a shorter or longer period than previously anticipated, the useful life of the
assets  is  adjusted,  resulting  in  a  change  in  estimate.  Changes  in  estimates  are  accounted  for  on  a  prospective  basis  by  depreciating  the  current  carrying
values of the assets over their revised remaining useful lives.

Construction-in-progress (“CIP”) is not depreciated until the asset is placed in service.

Impairment of Long-Lived Assets

The  Company  evaluates  long-lived  assets  for  potential  impairment  when  events  or  changes  in  circumstances  indicate  the  carrying  value  of  the
assets  may  not  be  recoverable.  We  review  the  recoverability  of  the  net  book  value  of  long-lived  assets  whenever  events  and  circumstances  indicate
("triggering events") that the net book value of an asset may not be recoverable from the estimated undiscounted future cash flows expected to result from
its use and eventual disposition. In cases where a triggering event occurs and undiscounted expected future cash flows are less than the net book value, we
recognize an impairment loss equal to an amount by which the net book value exceeds the fair value of the asset. Long-lived assets to be disposed of are
reported  at  the  lower  of  carrying  amount  or  fair  value  less  cost  to  sell.  The  Company  has  not  experienced  any  triggering  events  or  recognized  any
impairment losses for the years ended December 31, 2023, 2022, and 2021.

Leases

The  Company  accounts  for  its  lease  agreements  in  accordance  with  Financial  Accounting  Standards  Board  (“FASB”)  Accounting  Standards
Codification  (“ASC”)  Topic  842,  Leases.  Right-of-use  lease  assets  represent  the  right  to  use  an  underlying  asset  during  the  lease  term  and  the  lease
liabilities represent the commitment to make lease payments arising from the lease. Right-of-use lease assets and obligations are recognized based on the
present  value  of  remaining  lease  payments  over  the  lease  term.  As  the  Company’s  existing  lease  agreements  do  not  provide  an  implicit  rate  and  as  the
Company does not have any external borrowings, the Company has used an estimated incremental borrowing rate based on the information available at
lease commencement in determining the present value of lease payments. Operating lease expense is recognized on a straight-line basis over the lease term.
Variable  lease  expense  is  recognized  in  the  period  in  which  the  obligation  for  the  payment  is  incurred.  In  addition,  the  Company  also  has  made  an
accounting policy election to exclude leases with an initial term of twelve months or less from its consolidated balance sheets and to account for lease and
non-lease components of its operating leases as a single component.

Research and Development Expenses

Research  and  development  costs  are  charged  to  expense  as  incurred  in  performing  research  and  development  activities.  These  costs  include
employee  compensation  costs,  facilities  and  overhead,  preclinical  and  clinical  activities,  clinical  manufacturing  costs,  contract  management  services,
regulatory and other related costs.

The  Company  estimates  contract  research  and  manufacturing  expenses  based  on  the  services  performed  pursuant  to  contracts  with  research
organizations and manufacturing organizations that manufacture materials used in the Company’s ongoing preclinical and clinical studies. Non-refundable
advanced  payments  for  goods  or  services  to  be  received  in  the  future  for  use  in  research  and  development  activities  are  deferred  and  capitalized.  The
capitalized amounts are expensed as the related goods are delivered or the services are performed.

F-12

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in
each  period.  These  estimates  are  based  on  communications  with  third-party  service  providers  and  the  Company’s  estimates  of  accrued  expenses  using
information  available  at  each  balance  sheet  date.  If  the  actual  timing  of  the  performance  of  services  or  the  level  of  effort  varies  from  the  estimate,  the
Company will adjust the accrual accordingly.

Stock-Based Compensation Expense

The  Company  applies  the  fair  value  recognition  provisions  of  FASB  ASC  Topic  718,  Compensation—Stock  Compensation  (“ASC  718”),  to
account for stock-based compensation. Compensation costs related to stock options granted are based on the estimated fair value of the awards on the date
of grant.

ASC 718 requires all stock-based payments, including grants of stock options and restricted stock, to be recognized in the consolidated statements
of operations and comprehensive income (loss) based on their grant-date fair values. Compensation expense for stock options, restricted stock awards, and
restricted  stock  units  is  recognized  on  a  straight-line  basis  based  on  the  grant-date  fair  value  over  the  associated  service  period  of  the  award,  which  is
generally the vesting term. Compensation expense for performance-based restricted stock units is recognized for the awards that are probable of vesting
over the service period of the award. On a quarterly basis, management estimates the probable number of performance-based restricted stock units that
would vest until such time that the ultimate achievement of the performance criteria are known.

The Company estimates the fair value of its stock options using the Black-Scholes option pricing model, which requires the input of subjective
assumptions,  including:  (i)  the  expected  stock  price  volatility;  (ii)  the  expected  term  of  the  award;  (iii)  the  risk-free  interest  rate;  and  (iv)  expected
dividends. Once the Company's own sufficient historical volatility data was available in 2021, the Company eliminated the use of a representative peer
group and began using only its own historical volatility data in its estimate of expected volatility.

The Company estimates the expected term of its stock options using the “simplified” method, whereby the expected term equals the arithmetic
mean of the vesting term and the original contractual term of the option. The risk-free interest rates are based on US Treasury securities with a maturity
date commensurate with the expected term of the associated award. The Company has never paid and does not expect to pay dividends in the foreseeable
future. The Company accounts for forfeitures as they occur. Stock-based compensation expense recognized in the financial statements is based on awards
for which service conditions are expected to be satisfied.

Income Taxes

For the years ended December 31, 2023, 2022, and 2021, income taxes were recorded in accordance with FASB ASC Topic 740, Income Taxes
(“ASC 740”), which provides for deferred taxes using an asset and liability approach. Under this method, we record deferred tax assets and liabilities for
the expected future tax consequences of temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities
using enacted tax rates expected to be in effect when the differences are expected to reverse. Valuation allowances are provided when necessary to reduce
net deferred tax assets to the amount that is more likely than not to be realized. Based on the available evidence, we are unable, at this time, to support the
determination that it is more likely than not that our deferred tax assets will be utilized in the future. Accordingly, we recorded a full valuation allowance as
of December 31, 2023 and 2022. We intend to maintain a valuation allowance until sufficient evidence exists to support its reversal.

The  Company  accounts  for  uncertain  tax  positions  in  accordance  with  the  provisions  of  ASC  740.  When  uncertain  tax  positions  exist,  the
Company recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the
tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and
circumstances. As of December 31, 2023 and 2022, the Company did not have any significant uncertain tax positions.

The Company may recognize interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2023 and 2022,
the Company had no accrued interest or penalties related to uncertain tax positions and no amounts have been recognized in the Company’s consolidated
statements of operations and comprehensive income (loss).

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity during a period from transactions from non-owner sources. Unrealized gains or
losses on available-for-sale securities is a component of other comprehensive gains or losses and is presented net of taxes. We record reclassifications from
other comprehensive gains or losses to interest and other income, net on the consolidated statements of operations and comprehensive income (loss) related
to realized gains on sales of available-for-sale securities.

F-13

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

The Company reviews its securities quarterly to determine whether an other-than-temporary impairment has occurred. The Company determined

that there were no other-than-temporary impairments during the years ended December 31, 2023, 2022, and 2021.

Recent Accounting Pronouncements

In December 2023, the FASB issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”. The purpose of this
guidance  is  to  enhance  the  transparency  and  usefulness  of  income  tax  disclosures  and  provide  comprehensive  income  tax  information,  particularly  in
relation to rate reconciliation and income taxes paid in the U.S. and foreign jurisdictions. This new standard will be effective for fiscal years starting after
December 15, 2024, with the option to apply it retrospectively. Early adoption is also allowed. Currently, the company is assessing the potential impact of
this guidance on its consolidated financial statement disclosures.

In November 2023, the FASB issued Accounting Standard Update (“ASU”) No. 2023-07: Improvements to Reportable Segment Disclosures. This
new standard requires public entities to disclose significant segment expenses and additional segment items annually and in interim periods, and to provide
all  reported  segment  profit  or  loss  information  and  assets  currently  required  each  year.  The  standard  also  requires  disclosure  of  the  Chief  Operating
Decision Maker's title and position. The standard does not change the manner in which public entities identify their operating segments, aggregate them, or
apply the quantitative thresholds for determining their reportable segments. The new standard applies for fiscal years starting after December 15, 2023 and
interim periods starting after December 15, 2024, with early adoption permitted. The Company has determined it operates as a single segment, therefore,
we anticipate that this ASU will minimally impact our disclosed information and will not impact our consolidated balance sheets, consolidated statements
of operations and comprehensive income (loss), consolidated statements of stockholders’ equity, or consolidated statements of cash flows.

There were no recently adopted accounting pronouncements that had a material impact on the Company's consolidated financial statements, and

no additional recently issued accounting pronouncements that are expected to have a material impact on the Company's consolidated financial statements.

3.    Revenue Recognition

The Company began commercial marketing and sales of VYJUVEK throughout the United States and began recognizing revenue in 2023. For the
years  ended  December  31,  2023,  2022,  2021,  the  Company  recognized  net  product  revenue  of  50.7  million,  zero,  and  zero,  respectively.  Accounts
receivable, net balances were 42.0 million and zero as of December 31, 2023 and 2022, respectively.

The following table summarizes changes in allowances and discounts for the year ended December 31, 2023 (in thousands):

Balance as of December 31, 2022

Provision
Payments/Credits

Balance, as of December 31, 2023

Rebates

Prompt Pay

Other Accruals

Total

$

$

—  $

5,990 
(13)
5,977  $

—  $

1,164 
(306)
858  $

—  $
323 
(44)
279  $

— 
7,477 
(363)
7,114 

4.    Net Income (Loss) Per Share Attributable to Common Stockholders

Basic  net  income  (loss)  per  share  attributable  to  common  stockholders  is  calculated  by  dividing  net  income  (loss)  attributable  to  common
stockholders by the weighted average shares outstanding during the period, without consideration for common stock equivalents. Diluted net income (loss)
per share attributable to common stockholders is computed by dividing the net income (loss) by the weighted-average number of shares of common stock
and common stock equivalents outstanding for the period. Common stock equivalents consist of common stock issuable upon exercise of stock options and
vesting of restricted stock awards, restricted stock units, and performance-based restricted stock units.

There were 896,745, 3,582,181, and 2,043,179 common stock equivalents outstanding in the form of stock options and zero, 66,600, and 98,800
unvested restricted stock awards as of December 31, 2023, 2022 and 2021, respectively, that have been excluded from the calculation of diluted net income
(loss) per common share as their effect would be anti-dilutive.

F-14

(In thousands, except share and per share data)
Numerator:

Net income (loss)

Denominator:

Weighted-average basic common shares
Dilutive effect of stock options and unvested restricted stock

 Weighted-average diluted common shares

Net income (loss) per common share — Basic
Net income (loss) per common share — Diluted

5.    Fair Value Instruments

Years Ended December 31,

2023

2022

2021

10,932  $

(139,975) $

(69,570)

27,154,190 
597,619 

25,491,721 
— 

22,196,846 
— 

27,751,809 

25,491,721 

22,196,846 

0.40  $
0.39  $

(5.49) $
(5.49) $

(3.13)
(3.13)

$

$
$

The  following  tables  show  the  Company’s  cash,  cash  equivalents  and  available-for-sale  securities  by  significant  investment  category  as  of

December 31, 2023 and 2022, respectively (in thousands):

Amortized Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Aggregate Fair
Value

Cash and Cash
Equivalents

Short-term
Marketable
Securities (1)

Long-term
Marketable
Securities (2)

December 31, 2023

Level 1:
Cash and cash equivalents
Subtotal
Level 2:
Commercial paper
Corporate bonds
U.S government agency securities
and treasuries
Subtotal
Total

$

$

358,328  $
358,328 

17,124 
111,824 

106,079 
235,027 
593,355  $

—  $
— 

5 
407 

423 
835 
835  $

—  $
— 

358,328  $
358,328 

358,328  $
358,328 

—  $
— 

(1)
(27)

(30)
(58)
(58) $

17,128 
112,204 

106,472 
235,804 
594,132  $

December 31, 2022

— 
— 

— 

— 
358,328  $

17,128 
70,996 

85,726 
173,850 
173,850  $

— 
— 

— 
41,208 

20,746 
61,954 
61,954 

Amortized Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Aggregate Fair
Value

Cash and Cash
Equivalents

Short-term
Marketable
Securities (1)

Long-term
Marketable
Securities (2)

Level 1:
Cash and cash equivalents
Subtotal
Level 2:
Commercial paper
Corporate bonds
U.S government agency securities
and treasuries
Subtotal
Total

$

$

161,900  $
161,900 

63,624 
82,241 

76,683 

222,548 
384,448  $

—  $
— 

5 
13 

161 
179 
179  $

—  $
— 

161,900  $
161,900 

161,900  $
161,900 

—  $
— 

(23)
(419)

(393)
(835)
(835) $

63,606 
81,835 

76,451 

— 
— 

— 

221,892 
383,792  $

— 
161,900  $

63,606 
77,214 

76,451 
217,271 
217,271  $

— 
— 

— 
4,621 

— 
4,621 
4,621 

(1)
(2)

The Company’s short-term marketable securities mature in one year or less.
The Company’s long-term marketable securities mature between one year and two years.

See Note 2 to these consolidated financial statements for additional discussion regarding the Company’s fair value measurements.

F-15

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

6.    Balance Sheet Components

Inventory

Inventory consisted of the following as of December 31, 2023 and 2022, respectively (in thousands):

Raw materials
Work-in-process
Finished goods
Inventory

Property and Equipment, Net

December 31,
2023

December 31,
2022

$

$

3,154  $
3,204 
627 
6,985  $

— 
— 
— 
— 

Property and equipment, net consisted of the following as of December 31, 2023 and 2022, respectively (in thousands):

Building and building improvements
Leasehold improvements
Manufacturing equipment
Construction-in-progress
Laboratory equipment
Furniture and fixtures
Computer equipment and software
Total property and equipment

Accumulated depreciation

Property and equipment, net

December 31,
2023

December 31,
2022

$

$

111,180  $
25,068 
24,905 
7,291 
2,339 
1,632 
1,614 
174,029 
(12,827)
161,202  $

— 
24,217 
9,783 
131,331 
2,089 
957 
100 
168,477 
(6,793)
161,684 

Depreciation expense was $5.0 million, $2.6 million and $1.8 million for the years ended December 31, 2023, 2022, and 2021, respectively.

On  March  27,  2023,  the  Company  received  the  permanent  occupancy  permit  for  its  second  commercial  scale  CGMP  facility,  ASTRA,  which
allowed the Company to begin utilizing certain portions of the building. As a result and as qualification of assets occurred throughout 2023, the majority of
assets  relating  to  ASTRA  were  reclassified  from  construction  in  progress  to  leasehold  improvements,  manufacturing  equipment,  buildings  and  building
improvements, furniture and fixtures, or computer equipment and software as it was determined that assets were ready for their intended use. As certain
pieces of equipment are not yet qualified, the Company will continue to hold the remaining assets within construction in progress until qualification has
been completed and the assets are ready for their intended use.

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following as of December 31, 2023 and 2022, respectively (in thousands):

Accrued payroll and benefits
Accrued rebates
Accrued construction in progress
Accrued taxes
Other current liabilities
Accrued professional fees
Accrued preclinical and clinical expenses

Total

F-16

December 31,
2023

December 31,
2022

$

$

8,778  $
5,977 
5,182 
2,283 
2,210 
1,810 
1,248 
27,488  $

6,781 
— 
11,452 
43 
267 
3,397 
1,365 
23,305 

 
 
 
 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

7.    Commitments and Contingencies

Agreements with Contract Manufacturing Organizations and Contract Research Organizations

The  Company  enters  into  various  agreements  in  the  normal  course  of  business  with  Contract  Research  Organizations  (“CROs”),  Contract
Manufacturing Organizations (“CMOs”) and other third parties for preclinical research studies, clinical trials and testing and manufacturing services. The
agreements with CMOs primarily relate to the manufacturing of our cell and virus banks and for the manufacturing of our sterile gel that is mixed with in-
house  produced  vectors  as  part  of  the  final  drug  product  for  VYJUVEK.  Agreements  with  third  parties  may  also  include  research  and  development
consulting activities, clinical-trial agreements, storage, packaging, labeling, and/or testing of our pre-commercial and clinical-stage products. The Company
is obligated to make milestone payments under certain of these contracts. The Company may also be responsible for the payment of a monthly service fee
for  project  management  services  for  the  duration  of  any  agreements.  The  estimated  remaining  commitment  as  of  December  31,  2023  under  these
agreements is approximately $1.7 million. The Company has incurred research and development expenses under these agreements of $5.2 million, $6.0
million and $5.0 million for the years ended December 31, 2023, 2022, and 2021, respectively.

ASTRA Contractual Obligations

The  Company  has  contracted  with  various  third  parties  to  complete  and  qualify  our  second  CGMP  facility,  ASTRA.  The  estimated  remaining
commitment as of December 31, 2023 is $8.2 million and primarily relates to building improvements and certain qualification activities of the facility that
have been completed and placed into service as of December 31, 2023.

Legal Proceedings

In  May  2020,  a  complaint  was  filed  against  the  Company  in  the  United  States  District  Court  for  the  Western  District  of  Pennsylvania  by
PeriphaGen,  Inc.  ("PeriphaGen")  alleging  breach  of  contract  and  misappropriation  of  trade  secrets.  On  April  27,  2022,  the  Company  and  PeriphaGen
entered into a final settlement agreement, and the Company paid PeriphaGen an upfront payment of $25.0 million on April 28, 2022 for: (i) the release of
all claims in the trade secret litigation with PeriphaGen; (ii) the acquisition of certain PeriphaGen assets, and (iii) the grant of a license by PeriphaGen for
dermatological applications. In accordance with the settlement agreement, on June 15, 2023, the Company paid PeriphaGen an additional $12.5 million
following the FDA’s approval of VYJUVEK. The settlement agreement requires the Company to pay three additional $12.5 million contingent milestone
payments upon reaching $100.0 million in total cumulative sales, $200.0 million in total cumulative sales and $300.0 million in total cumulative sales. As
defined in the settlement agreement, cumulative sales shall include all revenue from sales of the Company products by the Company and its affiliates and
licensees,  as  reported  by  the  Company  in  its  annual  Form  10-K  filings.  If  all  milestones  are  achieved,  the  total  consideration  for  settling  the  dispute,
acquiring certain assets, and granting of a license from PeriphaGen will be $75.0 million, of which $37.5 million has been paid.

The Company recorded the settlement payments of $12.5 million, $25.0 million, and zero for the year ended December 31, 2023, 2022, and 2021,
respectively, under litigation settlement expense on the consolidated statements of operations and comprehensive income (loss). The additional contingent
milestone  payments  were  not  deemed  probable  due  to  uncertainty  in  the  achievement  of  these  milestones  as  of  December  31,  2023,  and  therefore  no
additional accrual has been recorded.

The Company has received zero, $1.1 million, $1.6 million, of insurance proceeds during fiscal years ending December 31, 2023, 2022, and 2021
respectively.  The  reimbursements  have  been  recorded  as  an  offset  to  our  legal  fees  included  in  selling,  general  and  administrative  expenses  on  the
consolidated statements of operations and comprehensive income (loss) and within operating activities on the consolidated statements of cash flows.

8.    Leases

Lease Agreements

In May 2016, the Company signed an operating lease for laboratory and office space in Pittsburgh, Pennsylvania that commenced in June 2016
and  was  scheduled  to  expire  in  October  2017  (the  “2016  Lease”).  The  2016  Lease  has  been  amended  several  times  to  increase  the  area  leased,  which
currently consists of approximately 54,000 square feet and includes the commercial scale CGMP-compliant manufacturing facility (“ANCORIS”). As a
result of the lease amendments, the 2016 Lease expiration date was extended to October 2031. In September 2022, the Company amended the 2016 Lease
(“Short-Term  Amendment”)  to  add  a  12  month  lease  for  additional  office  space  that  commenced  in  October  2022  and  subsequently  amended  the  lease
again in September 2023, which commenced in October 2023 and extended the lease until September 2024. The Short-Term Amendment increased the area
leased by approximately 7,000 square feet through September 2024. Due to the short-term nature of these amendments and the Company's lease accounting
policy, the Company did not record a right-of-use asset or corresponding lease liability.

F-17

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

In December 2019, the Company entered into a lease agreement for a second commercial gene therapy facility, (“ASTRA”), in the Pittsburgh,
Pennsylvania area (“ASTRA lease”) with Northfield I, LLC (the “Landlord”, “Northfield”, or “Lessor”) with an initial lease term that expired on October
2035. The ASTRA lease contained an option (“Purchase Option”) to purchase the building, related improvements and take corresponding assignment of the
Landlord's rights under its existing Ground Lease (the “Ground Lease”).

In October 2020, the Company was provided with notice that the initial delivery conditions of the building had been met, including completion of
the  building  shell,  interior  slab,  and  exterior  doors,  and  the  Company  gave  the  Landlord  notice  of  its  intent  to  purchase  ASTRA  for  approximately
$9.4 million, subject to the parties entering into a commercially reasonable purchase and sale agreement. As a result of the Company's ability to exercise its
option to purchase ASTRA, the Company obtained control over the construction in progress of ASTRA. The Company recorded a $10.0 million CIP asset
and a corresponding build-to-suit lease liability related to the costs incurred by the Landlord, offset by the previous cash contributions of $2.4 million.

In January 2021, the Company entered into a Purchase and Sale Agreement (“PSA”) for ASTRA with Northfield related to the purchase option
exercised by the Company in October 2020, for a purchase price of $9.4 million. The Company held approximately $1.5 million on deposit with Northfield
under the existing lease agreement and applied this deposit as a credit against the purchase price at closing. In February 2021, Northfield delivered the
space as substantially complete and made the space available for access by the Company, thus triggering lease commencement. As a result, the Company
concluded that this transaction did not qualify for sale-leaseback accounting because it did not meet the definition of a sale. As control did not transfer to
the Lessor at lease commencement, the transaction continued to be accounted for as construction in progress and a financing obligation. In March 2021, the
purchase  closed  and  the  Company  determined  that  reclassification  of  the  construction  in  progress  to  buildings  and  leasehold  improvements  was  not
appropriate as the interior of the building was not yet ready for its intended use. From construction completion to the closing of the purchase, the Company
recognized interest expense to accrete the financial obligation to a balance that equaled the cash consideration that was paid upon the close of purchase.
The building was placed into service as of December 31, 2023. For more information about the expected construction costs associated with ASTRA, see
“ASTRA Contractual Obligations” above.

As part of the transaction, the Company also became the accounting owner of the Ground Lease, due to obtaining control over ASTRA. When the
PSA was finalized, the Company took assignment of the Lessor's Ground Lease, in accordance with the Purchase Option, of which lease payments are
based on annual payments of $82 thousand, and are subject to a cumulative 10% escalation clause every 5 years through 2071.

In December 2021, the Company entered into a 3 year lease agreement for the Boston, Massachusetts office that commenced in January 2022 and

expires in January 2025.

In  May  2022,  the  Company  entered  into  a  16  month  lease  agreement  for  the  Zug,  Switzerland  office  that  commenced  in  September  2022  and
ended in December 2023. In September 2023, the Company entered into a 12 month lease that commenced January 2024 and expires in December 2024.
Due  to  the  short-term  nature  of  the  agreement  and  the  Company’s  lease  accounting  policy,  the  Company  did  not  record  a  right-of-use  asset  or
corresponding lease liability.

As of December 31, 2023, future minimum commitments under the Company’s operating leases were as follows (in thousands):

2024
2025
2026
2027
2028
Thereafter

Future minimum operating lease payments
Less: Interest

Present value of lease liability

F-18

Operating Leases

1,539 
1,277 
1,277 
1,300 
1,325 
9,438 
16,156 
(8,062)
8,094 

$

$

$

 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

Supplemental balance sheet information related to leases is as follows:

Operating leases:

Right-of-use assets
Current portion of lease liability
Lease liability

Total lease liability

Weighted average remaining lease term, in years
Weighted average discount rate

The components of the Company's lease expense are as follows:

Lease cost:

Operating lease expense
Variable lease expense

Total lease expense

9.    Capitalization

Public Sale of Common Stock

December 31,
2023

December 31,
2022

$

$

7,027 
1,474 
6,620 
8,094 

$

$

12.3
9.5 %

8,042 
1,561 
7,372 
8,933 

12.5
9.4 %

2023

Years Ended December 31,
2022

2021

$

$

1,596  $
203 
1,799  $

1,532  $
226 
1,758  $

1,275 
160 
1,435 

In December 2021, the Company completed an underwritten public offering of 2,866,667 shares of its common stock, including 200,000 shares
purchased by the underwriters pursuant to their option to purchase additional shares, at $75.00 per share. Net proceeds to the Company from the offering
were $201.9 million after deducting underwriting discounts and commissions of approximately $12.9 million, and other offering expenses payable by the
Company of $227 thousand.

In February 2021, the Company completed an underwritten public offering of 2,211,538 shares of its common stock, including 288,461 shares
purchased by the underwriters pursuant to their option to purchase additional shares, at $65.00 per share. Net proceeds to the Company from the offering
were $134.9 million after deducting underwriting discounts and commissions of approximately $8.6 million, and other offering expenses payable by the
Company of $198 thousand.

ATM Program

On December 31, 2020, the Company entered into a sales agreement with Cowen and Company, LLC ("Cowen") with respect to an at-the-market
equity  offering  program  ("2020  ATM  Program"),  under  which  the  Company  issued  and  sold  from  time  to  time  through  Cowen,  acting  as  agent  and/or
principal,  shares  of  its  common  stock,  par  value  $0.0001  per  share,  having  an  aggregate  offering  price  up  to  $150.0  million  ("Placement  Shares").  The
issuance and sale of the Placement Shares were made pursuant to the Company's effective "shelf" registration statement on Form S-3 that was filed with the
Securities and Exchange Commission (the “SEC”) on May 4, 2020 (the “2020 Shelf Registration Statement”). During the year ended December 31, 2022,
the Company issued and sold 434,782 Placement Shares at a weighted average price of $69.00 per share for net proceeds of $29.1 million after deducting
selling commissions of approximately $900 thousand.

During the year ended December 31, 2021, 262,500 shares of common stock were issued pursuant to the ATM Program at a weighted average

price of $66.50 per share for net proceeds of $16.9 million after deducting underwriting discounts and commissions of approximately $524 thousand,

The Company’s 2020 Shelf Registration Statement expired on May 4, 2023, and the Company put in place a new at-the-market equity offering
program under substantially the same terms as the 2020 ATM Program (the “New ATM Program”). Accordingly, on May 8, 2023, the Company entered
into a new sales agreement with Cowen to issue and sell shares of the Company’s common stock having an aggregate offering price of up to $150.0 million
(the “New Placement Shares”) from time to time, under which Cowen will act as the Company’s agent and/or principal. The New Placement Shares will be
offered and sold pursuant to the Company’s effective shelf registration statement on Form S-3 filed with the SEC on April 6, 2023, and a

F-19

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

prospectus supplement relating to the New Placement Shares that was filed with the SEC on May 8, 2023. During the year ended December 31, 2023, no
shares of common stock were issued pursuant to the New ATM Program, resulting in $150.0 million available for issuance under the New ATM Program.

2023 Private Placement Offering

On  May  22,  2023  and  May  23,  2023,  the  Company  sold  1,720,100  and  9,629  shares  of  common  stock,  respectively,  in  a  private  placement  to
certain  institutional  investors  at  a  price  of  $92.50  per  share  for  aggregate  net  proceeds  of  $160.0  million.  In  addition,  the  Company  entered  into  a
Registration Rights Agreement with the investors (“Registration Rights Agreement”) that required the Company to file a registration statement with the
SEC within 60 days of the date of the Registration Rights Agreement registering the resale of the shares of common stock issued in the private placement.
On July 18, 2023, the Company filed the resale registration statement on Form S-3ASR with the SEC, which became effective upon filing.

10.    Stock-Based Compensation

In 2017, the Company adopted the 2017 IPO Stock Plan (the “Plan”), which governs the issuance of equity awards to employees, certain non-
employee consultants, and directors. Initially, the Company reserved 900 thousand shares for issuance under the Plan with an initial sublimit for incentive
stock options of 900 thousand shares. On an annual basis, the amount of shares available for issuance under the Plan increases by an amount equal to four
percent of the total outstanding shares as of the last day of the preceding calendar year. The sublimit of incentive stock options is not subject to the increase.
The Company has historically granted stock options and restricted stock awards to its employees. In February 2023, the Company began issuing restricted
stock units and performance-based restricted stock units to certain employees.

Stock Options

Options granted to employees and non-employees vest ratably over a four-year period and stock options granted to directors of the company vest

ratably over one-year to three-year periods. Stock options have a life of ten years.

The Company granted 435,280 and 2,130,500 stock options to employees, non-employees, and directors during the years ended December 31,

2023 and 2022, respectively.

The following table summarizes the Company’s stock option activity:

Balance at January 1, 2022

Granted
Exercised
Cancelled or forfeited
Expired

Balance at December 31, 2022

Granted
Exercised
Cancelled or forfeited
Expired

Balance at December 31, 2023
Exercisable at December 31, 2023

Stock
Options
Outstanding

Weighted-
average
Exercise
Price

2,043,179  $
2,130,500 
(138,855)
(438,892)
(13,751)
3,582,181  $

435,280 
(752,752)
(658,117)
— 

2,606,592  $

778,411  $

57.00 
64.14 
50.47 
59.22 
78.80 
61.50 

92.14 
58.15 
64.29 
— 
66.39 

57.20 

Weighted-
average
Remaining
Contractual
Life (Years)

Aggregate
Intrinsic
Value
(In thousands) (1)

9.0 $

31,331 

8.7 $

64,880 

7.9 $

6.9 $

150,405 

52,048 

(1)

Aggregate intrinsic value represents the difference between the closing stock price of our common stock on December 31, 2023 and the exercise price of outstanding in-the-money
options.

The total intrinsic value (the amount by which the fair market value exceeded the exercise price) of stock options exercised during the years ended

December 31, 2023 and 2022 was $43.8 million and $2.9 million, respectively.

The  weighted-average  grant-date  fair  value  per  share  of  options  granted  to  employees,  non-employees,  and  directors  during  the  years  ended

December 31, 2023 and 2022 was $63.38 and $44.50, respectively.

There was $68.5 million of unrecognized stock-based compensation expense related to employees’, non-employees’, and directors’ options that is

expected to be recognized over a weighted-average period of 2.4 years as of December 31, 2023.

F-20

 
 
 
 
 
 
 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

The  Company  has  recorded  aggregate  stock-based  compensation  expense  related 

in
the  consolidated  statements  of  operations  and  comprehensive  income  (loss)  for  the  years  ended  December  31,  2023,  2022,  and  2021  as  follows  (in
thousands):

issuance  of  stock  option  awards 

the 

to 

Research and development
Selling, general and administrative
Total stock-based compensation

Years Ended December 31,

2023

2022

2021

$

$

8,942  $

24,988 
33,930  $

7,897  $

23,551 
31,448  $

3,434 
10,235 
13,669 

The fair value of options granted was estimated at the date of grant using the Black-Scholes valuation model with the following weighted-average

assumptions for the years ended December 31, 2023, 2022, and 2021:

Expected stock price volatility
Expected term of the award (years)
Risk-free interest rate
Weighted average exercise price
Forfeiture Rate
Dividend Yield

Restricted Stock Awards

Years Ended December 31,

2023

2022

2021

73 %
6.0
3.96 %
92.14 

— %
— %

$

78 %
6.2
2.42 %
64.14 

— %
— %

$

72 %
6.2
1.10 %
66.88 

— %
— %

$

Restricted stock awards (“RSAs”) granted to employees vest ratably over a four-year period. The Company granted no RSAs to employees of the

Company for each of the years ended December 31, 2023 and 2022 respectively.

The following table summarizes the Company’s RSA activity:

Non-vested RSAs as of December 31, 2021

Granted
Vested
Surrendered or forfeited

Non-vested RSAs as of December 31, 2022

Granted
Vested
Surrendered or forfeited

Non-vested RSAs as of December 31, 2023

Number of Shares

Weighted Average
Grant Date
Fair Value

98,800  $
—  $
(14,321) $
(17,879) $
66,600  $

—  $
(12,649) $
(9,551) $
44,400  $

78.89 
— 
78.89 
78.89 
78.89 

— 
78.89 
78.89 
78.89 

There was $2.0 million of unrecognized stock-based compensation expense related to employees’ awards that is expected to be recognized over a

weighted-average period of 1.2 years as of December 31, 2023.

The  Company  recorded  the  following  stock-based  compensation  expense  related  to  RSAs  in  the  consolidated  statements  of  operations  and

comprehensive income (loss) for the years ended December 31, 2023, 2022, and 2021 as follows (in thousands):

F-21

 
 
 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

Selling, general and administrative
Total stock-based compensation

Restricted Stock Units

2023

Years Ended December 31,
2022

2021

$
$

1,747  $
1,747  $

1,782  $
1,782  $

1,650 
1,650 

Restricted  stock  units  (“RSUs”)  granted  to  employees  vest  ratably  over  a  four-year  period.  The  Company  granted  186,900  and  zero  RSUs  to

employees of the Company during the years ended December 31, 2023 and 2022, respectively.

Non-vested RSUs as of December 31, 2022

Granted
Vested
Surrendered or forfeited

Non-vested RSUs as of December 31, 2023

Number of Shares

Weighted Average
Grant Date
Fair Value

— 
186,900  $
— 
(26,000) $
160,900  $

81.91 

81.91 
81.91 

There was $10.4 million of unrecognized stock-based compensation expense related to employees’ RSU awards that is expected to be recognized

over a weighted-average period of 3.2 years as of December 31, 2023.

The  Company  recorded  stock-based  compensation  expense  related  to  RSUs  in  the  consolidated  statements  of  operations  and  comprehensive

income (loss) for the years ended December 31, 2023, 2022, and 2021 as follows (in thousands):

Research and development
Selling, general and administrative
Total stock-based compensation

Performance-Based Restricted Stock Units

2023

Years Ended December 31,
2022

2021

$

$

1,112  $
1,427 
2,539  $

—  $
— 
—  $

— 
— 
— 

Performance-based restricted stock units (“PSUs”) granted to employees vest ratably over two years based upon continued service through the
vesting  date  and  the  achievement  of  specific  regulatory  and  commercial  performance  criteria  as  determined  by  the  Compensation  Committee  of  the
Company’s Board of Directors. The performance criteria are to be completed by the end of the year in which the PSU awards were granted. Each PSU
represents the right to receive one share of the Company's common stock upon vesting. The Company recognizes stock-based compensation expense for
the fair value of the PSU awards relating to the portion of the awards that are probable of vesting over the service period. On a quarterly basis, management
estimates  the  probable  number  of  PSU’s  that  would  vest  until  such  time  that  the  ultimate  achievement  of  the  performance  criteria  are  known.  As  of
December 31, 2023, the Company determined that 100% of the PSUs granted will be eligible to vest.

The Company granted 60,000 and zero PSUs to employees of the Company during the years ended December 31, 2023 and 2022.

Non-vested PSUs as of December 31, 2022

Granted
Vested
Surrendered or forfeited

Non-vested PSUs as of December 31, 2023

F-22

Number of Shares

Weighted Average
Grant Date
Fair Value

— 
60,000  $
— 
(10,000) $
50,000  $

81.91 

81.91 
81.91 

 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

There was $2.4 million of unrecognized stock-based compensation expense related to employees’ PSU awards that is expected to be recognized

over a weighted-average period of 1.2 years as of December 31, 2023.

The  Company  recorded  stock-based  compensation  expense  related  to  PSUs  in  the  consolidated  statements  of  operations  and  comprehensive

income (loss) for the years ended December 31, 2023, 2022, and 2021 as follows (in thousands):

Selling, general and administrative
Total stock-based compensation

2023

Years Ended December 31,
2022

2021

$
$

1,717  $
1,717  $

—  $
—  $

— 
— 

Shares remaining available for grant under the Plan were 1,509,438, with a sublimit for incentive stock options of 22,786, at December 31, 2023.

After  the  FDA  approval  of  VYJUVEK  on  May  19,  2023,  the  Company  began  capitalizing  stock-based  compensation  associated  with  the
allocation of labor costs related to work performed to manufacture VYJUVEK. For the years ended December 31, 2023, 2022 and 2021, the Company
capitalized $1.1 million, zero, and zero, respectively, in inventory.

Historically,  the  Company  also  capitalized  the  portion  of  stock-based  compensation  related  to  work  performed  on  the  construction  of  our
manufacturing  facilities.  For  the  years  ended  December  31,  2023,  2022  and  2021,  the  Company  capitalized  $162  thousand,  $551  thousand,  and  $284
thousand, respectively, of stock-based compensation in property and equipment.

11.    Income Taxes

Our income (loss) before income taxes by jurisdiction consisted of the following:

U.S.
Foreign

Income (loss) before income taxes

The provision (benefit) for income taxes consists of the following:

Federal
State
Foreign

Total Tax Provision

2023

Years Ended December 31,
2022

2021

7,795  $
5,102 
12,897  $

(135,691) $
(4,284)
(139,975) $

(69,570)
— 
(69,570)

2023

Years Ended December 31,
2022

2021

125  $
1,702  $
138  $
1,965  $

—  $
—  $
—  $
—  $

— 
— 
— 
— 

$

$

$

$

F-23

Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

A reconciliation of income tax expense (benefit) computed at the statutory federal and state income tax rate for the year to income tax expense as

reflected in our financial statements for years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

Federal income tax expense (benefit) at statutory rate
Change in valuation allowance
State income tax expense (benefit) net of federal benefit
Credits
Stock Compensation
Section 162(m) limitation
GILTI
Other non-deductible expenses
Other

Total tax expense

Years Ended December 31,

2023

2022

2021

2,708  $
(5,457)
7,546 
(4,458)
(1,715)
2,674 
623 
136 
(92)
1,965  $

(29,395) $
39,781 
(10,438)
(3,167)
2,152 
620 
— 
30 
417 
—  $

(14,578)
20,689 
(5,436)
(1,259)
724 
— 
— 
(49)
(91)
— 

$

$

The significant components of the Company’s deferred tax assets and liabilities as of December 31, 2023 and 2022 are as follows (in thousands):

Deferred tax assets:

Net operating loss carryforwards
Stock compensation
Lease liability
Accrued expenses
Section 174 R&D capitalization
Intangible assets
Credits
Unrealized loss on marketable securities

Total deferred tax assets

Valuation allowance
Deferred tax assets
Deferred tax liabilities:

Depreciation
Right-of-use assets
Prepaid expenses
Unrealized gain on marketable securities

Total deferred tax liabilities
Net deferred tax assets

December 31,
2023

December 31,
2022

$

$

$
$

39,973  $
7,417 
2,056 
2,091 
20,006 
9,755 
10,299 
— 
91,597 
(76,995)
14,602  $

(11,537)
(1,778)
(1,090)
(197)
(14,602) $
—  $

52,569 
7,445 
2,572 
2,206 
5,782 
8,342 
6,708 
192 
85,816 
(82,513)
3,303 

(137)
(2,312)
(854)
— 
(3,303)
— 

The Company has evaluated the positive and negative evidence bearing upon the realizability of its deferred tax assets. Based on the Company’s
history  of  operating  losses,  the  Company  has  concluded  that  it  is  not  more  likely  than  not  that  the  benefit  of  its  deferred  tax  assets  will  be  realized.
Accordingly, the Company has provided a full valuation allowance for deferred tax assets as of December 31, 2023 and 2022.

As of December 31, 2023 and 2022, the Company had federal research and development credit carryforwards of approximately $4.8 million and
$2.0  million,  respectively.  The  federal  tax  credit  carryforwards  will  begin  to  expire  in  2039  if  not  utilized.  As  of  December  31,  2023  and  2022,  the
Company  also  had  orphan  drug  tax  credit  carryforwards  of  approximately  $5.5  million  and  $4.4  million,  respectively.  The  orphan  drug  tax  credit
carryforwards will begin to expire in 2039 if not utilized.

F-24

 
 
 
 
 
Krystal Biotech, Inc.
Notes to Consolidated Financial Statements — Continued

As of December 31, 2023, the Company fully utilized its state research and development credit carryforwards and as of December 31, 2022, the

Company had $457 thousand of state research and development credit carryforwards.

As  of  December  31,  2023,  the  Company  had  cumulative  U.S.  federal  NOL  carryforwards  of  approximately  $138.2  million.  The  federal  NOL

carryforwards are available indefinitely to offset future income tax liabilities with no expiration period.

As  of  December  31,  2023,  the  Company  had  cumulative  U.S.  state  NOL  carryforwards  of  approximately  $186.0  million.  The  state  NOLs  are

available to offset future state income tax liabilities and will begin to expire in 2037.

Under the provisions of the Internal Revenue Code, the NOL carryforwards are subject to review and possible adjustment by the Internal Revenue
Service  and  state  tax  authorities.  NOL  carryforwards  may  become  subject  to  an  annual  limitation  in  the  event  of  certain  cumulative  changes  in  the
ownership interest of significant shareholders over a three-year period in excess of 50%, as defined under Internal Revenue Code Sections 382 and 383 of
the Internal Revenue Code, respectively, as well as similar state provisions. This could limit the amount of tax attributes that can be utilized annually to
offset future taxable income or tax liabilities.

No  deferred  tax  assets  have  been  recognized  on  our  consolidated  balance  sheets  related  to  these  NOLs,  as  they  are  fully  offset  by  a  valuation
allowance. If we have previously had, or have in the future, one or more Section 382 “ownership changes,” including in connection with our initial public
offering or another offering, or if we do not generate sufficient taxable income, we may not be able to utilize a material portion of our NOLs, even if we
achieve profitability.

The  Company  files  income  tax  returns  in  the  United  States  at  the  federal  and  state  level  and  in  foreign  jurisdictions  in  which  the  Company
conducts  business  activities.  The  federal  and  state  income  tax  returns  are  subject  to  tax  examinations  for  the  tax  year  ended  December  31,  2022,  2021,
2020. To the extent the Company has tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination
by the Internal Revenue Service or state tax authorities to the extent utilized in a future period. Additionally, the Company is subject to tax examinations by
taxing  authorities  in  foreign  jurisdictions  where  it  has  business  operations.  At  this  time,  the  Company  is  not  undergoing  examination  by  the  Internal
Revenue Service or any state or foreign taxing authorities.

12.    Gain on Sale of Priority Review Voucher

In August 2023, the Company entered into an agreement to sell the rare pediatric disease voucher (“PRV”), which was awarded to the Company in
connection with the FDA’s approval of VYJUVEK. The transaction closed in August 2023 and was not subject to any commissions or closing costs. The
proceeds of $100.0 million from the sale of the PRV were recorded as a gain from sale of priority review voucher on the Company’s consolidated statement
of operations as it did not have a carrying value at the time of the sale, and as proceeds from sale of priority review voucher on the Company’s consolidated
statement of cash flows.

13.    Subsequent Events

The  Company  evaluates  events  or  transactions  that  occur  after  the  balance  sheet  date,  but  prior  to  the  issuance  of  the  financial  statements,  to
identify matters that require disclosure. The Company concluded that no subsequent events have occurred that would require recognition or disclosure in
the consolidated financial statements.

F-25

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

Under the supervision of our Chief Executive Officer and Chief Accounting Officer, we evaluated the effectiveness of our disclosure controls and
procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) as of December 31, 2023.  Based on that evaluation, our Chief Executive
Officer and Chief Accounting Officer have concluded that our disclosure controls and procedures were effective as of December 31, 2023 to ensure that
information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within
the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including our
Chief  Executive  Officer  and  Chief  Accounting  Officer,  as  appropriate  to  allow  timely  discussion  regarding  required  disclosures.  In  designing  and
evaluating our disclosure controls and procedures, management recognizes that any disclosure 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 its judgment in evaluating the benefits of possible controls
and procedures relative to their costs.

Management’s 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
Exchange Act Rules 13a-15(f) and 15d-15(f). Our management conducted an evaluation of the effectiveness of our internal control over financial reporting
as  of  December  31,  2023  based  on  the  criteria  established  in  Internal  Control  -  Integrated  Framework  (2013)  issued  by  the  Committee  of  Sponsoring
Organizations of the Treadway Commission.

Based on the results of its evaluation, management concluded that our internal control over financial reporting was effective as of December 31,
2023. The effectiveness of our internal control over financial reporting as of December 31, 2023 has been audited by KPMG, an independent registered
public accounting firm, as stated in their report which is included herein.

Inherent Limitations on Controls and Procedures

Our management, including the Chief Executive Officer and Chief Accounting Officer, do not expect that our disclosure controls and procedures
and our internal controls will prevent all error and all fraud. A control system, no matter how well designed and operated, can only provide reasonable
assurances that the objectives of the control system are met. The design of a control system reflects resource constraints; the benefits of controls must be
considered relative to their costs. Because there are inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that
all control issues and instances of fraud, if any, within the Company have been or will be detected. As these inherent limitations are known features of the
financial  reporting  process,  it  is  possible  to  design  into  the  process  safeguards  to  reduce,  though  not  eliminate,  these  risks.  These  inherent  limitations
include  the  realities  that  judgments  in  decision-making  can  be  faulty  and  that  breakdowns  occur  because  of  simple  error  or  mistake.  Controls  can  be
circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any
system  of  controls  is  based  in  part  upon  certain  assumptions  about  the  likelihood  of  future  events.  While  our  disclosure  controls  and  procedures  are
designed to provide reasonable assurance of achieving their objectives, there can be no assurance that any design will succeed in achieving its stated goals
under all future conditions. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with
the policies or procedures. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be
detected.

We intend to review and evaluate the design and effectiveness of our disclosure controls and procedures on an ongoing basis and to improve our
controls  and  procedures  over  time  and  to  correct  any  deficiencies  that  we  may  discover  in  the  future.  While  our  Chief  Executive  Officer  and  Chief
Accounting Officer have concluded that, as of December 31, 2023, the design of our disclosure controls and procedures, as defined in Rule 13a-15(e) under
the Exchange Act, was effective, future events affecting our business may cause us to significantly modify our disclosure controls and procedures.

Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15(d) and
15d-15(d)  of  the  Exchange  Act  that  occurred  during  the  three  months  ended  December  31,  2023  that  has  materially  affected,  or  is  reasonably  likely  to
materially affect, our internal control over financial reporting.

110

Report of Independent Registered Public Accounting Firm

To the Stockholders and Board of Directors
Krystal Biotech, Inc.:

Opinion on Internal Control Over Financial Reporting

We have audited Krystal Biotech, Inc. and subsidiaries' (the Company) internal control over financial reporting as of December 31, 2023,
based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the
Treadway Commission. In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as
of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of
Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the
consolidated balance sheets of the Company as of December 31, 2023 and 2022, the related consolidated statements of operations and
comprehensive income (loss), stockholders’ equity, and cash flows for each of the years in the two-year period ended December 31, 2023,
and the related notes (collectively, the consolidated financial statements), and our report dated February 26, 2024 expressed an unqualified
opinion on those consolidated financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the
effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over
Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit.
We are a public accounting firm registered with the 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 audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our
audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the
risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the
assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that
our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting
principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of
records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally
accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of
management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized
acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any
evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions,
or that the degree of compliance with the policies or procedures may deteriorate.

Pittsburgh, Pennsylvania
February 26, 2024

/s/ KPMG LLP

111

Item 9B. Other Information.

None

Item 9C. Disclosure Regarding Foreign Jurisdictions That Prevent Inspections.

Not Applicable.

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Information required by this Item is hereby incorporated by reference to our 2024 Definitive Proxy Statement, which will be filed prior to April

30, 2024.

Item 11. Executive Compensation.

Information required by this Item is hereby incorporated by reference to our 2024 Definitive Proxy Statement, which will be filed prior to April

30, 2024.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information required by this Item is hereby incorporated by reference to our 2024 Definitive Proxy Statement, which will be filed prior to April

30, 2024.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Information required by this Item is hereby incorporated by reference to our 2024 Definitive Proxy Statement, which will be filed prior to April

30, 2024.

Item 14. Principal Accountant Fees and Services.  

Information required by this Item is hereby incorporated by reference to our 2024 Definitive Proxy Statement, which will be filed prior to April

30, 2024.

112

PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a)

List the following documents filed as a part of the report:
(1)

Financial statements

The response to this portion of Item 15 is set forth under Item 8 above.
(2)

Financial statement schedule.

All schedules have been omitted because they are not required or because the required information is given in the financial statements or
notes thereto set forth under Item 8 above.
(3)

Exhibits.

A list of exhibits filed with this report or incorporated herein by reference can be found in the Exhibit Index of this Report.

Exhibit Index

Exhibit
Number

Description

3.1

3.2

4.1

4.2

4.3

10.1#

10.2#

10.3#

10.4#

10.5#

10.6#

Second Amended and Restated Certificate of Incorporation of Krystal Biotech, Inc. (incorporated by reference to Exhibit 3.1 to the
Company’s Current Report on Form 8-K, as filed with the SEC on September 25, 2017)

Amended and Restated Bylaws of Krystal Biotech, Inc. (incorporate by reference to Exhibit 3.2 to the Company’s Current Report on
Form 8-K, as filed with the SEC on September 25, 2017)

Form of Common Stock Certificate (incorporated by reference to Exhibit 4.1 to the Company’s Amendment No. 2 to the Company’s
Registration Statement on Form S-1 (Reg. No. 333-220085), as filed with the SEC on September 14, 2017)

Form of Indenture (including form of Debt Securities) (incorporated by reference to Exhibit 4.5 to the Company’s Registration
Statement on Form S-3 (Reg. No. 333-227632), as filed with the SEC on October 1, 2018)

Description of Common Stock (incorporated by reference to Exhibit 4.3 to the Company's Annual Report on Form 10-K, as filed with
the SEC on February 27, 2023)
Form of Indemnification Agreement by and between Krystal Biotech, Inc. and each of its directors and executive officers (incorporated
by reference to Exhibit 10.1 to the Company’s Amendment No. 2 to the Company’s Registration Statement on Form S-1 (Reg. No.
333-220085), as filed with the SEC on September 14, 2017)

Executive Employment Agreement, effective July 1, 2017, by and between Krystal Biotech, Inc. and Krish S. Krishnan (incorporated
by reference to Exhibit 10.2 to the Company’s Amendment No. 1 to the Company’s Registration Statement on Form S-1 (Reg. No.
333-220085), as filed with the SEC on September 7, 2017)

Executive Employment Agreement, effective May 1, 2017, by and between Krystal Biotech, Inc. and Suma M. Krishnan (incorporated
by reference to Exhibit 10.3 to the Company’s Amendment No. 1 to the Company’s Registration Statement on Form S-1 (Reg. No.
333-220085), as filed with the SEC on September 7, 2017)

Executive Employment Agreement, effective January 20, 2020, by and between Krystal Biotech, Inc. and Kathryn A. Romano
(incorporated by reference to Exhibit 10.4 to the Company's Annual Report on Form 10-K, as filed with the SEC on March 1, 2021)

Executive Employment Agreement, effective May 3, 2021 by and between Krystal Biotech, Inc. and Andy Orth (incorporated by
reference to Exhibit 10.5 to the Company's Annual Report on Form 10-K, as filed with the SEC on February 28, 2022)
Krystal Biotech, Inc. 2017 Stock Incentive Plan (incorporated by reference to Exhibit 10.6 to the Company’s Amendment No. 2 to the
Company’s Registration Statement on Form S-1 (Reg. No. 333-220085), as filed with the SEC on September 14, 2017)

113

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number

10.7#

10.8#

10.9#

10.10

10.11

10.12

10.13

10.14

10.15

10.16

10.17

10.18

10.19

10.20

10.21

Description
Krystal Biotech, Inc. 2017 IPO Stock Incentive Plan (incorporated by reference to Exhibit 10.7 to the Company’s Amendment No. 2 to
the Company’s Registration Statement on Form S-1 (Reg. No. 333-220085), as filed with the SEC on September 14, 2017)

Form of Krystal Biotech, Inc. 2017 Stock Incentive Plan Notice of Stock Option Award (incorporated by reference to Exhibit 10.8 to
the Company’s Amendment No. 2 to the Company’s Registration Statement on Form S-1 (Reg. No. 333-220085), as filed with the
SEC on September 14, 2017)

Form of Krystal Biotech, Inc. 2017 IPO Stock Incentive Plan Notice of Stock Option Award (incorporated by reference to Exhibit 10.9
to the Company’s Amendment No. 2 to the Company’s Registration Statement on Form S-1 (Reg. No. 333-220085), as filed with the
SEC on September 14, 2017)

Lease Agreement, dated as of May 26, 2016, by and between Wharton Lender Associates, L.P. and Krystal Biotech, LLC (incorporated
by reference to Exhibit 10.10 to the Company’s Amendment No. 1 to the Company’s Registration Statement on Form S-1 (Reg. No.
333-220085), as filed with the SEC on September 7, 2017)

Second Amendment to Lease Agreement, dated as of February 27, 2017, by and between Wharton Lender Associates, L.P. and Krystal
Biotech, LLC (incorporated by reference to Exhibit 10.11 to the Company’s Amendment No. 1 to the Company’s Registration
Statement on Form S-1 (Reg. No. 333-220085), as filed with the SEC on September 7, 2017)

Investors’ Rights Agreement, dated as of August 7, 2017, by and among Krystal Biotech, Inc. and the investors listed on Schedule A
thereto (incorporated by reference to Exhibit 10.9 to the Company's Registration Statement on Form S-1 (Reg. No. 333-220085), as
filed with the SEC on August 21, 2017)

Third amendment to Lease Agreement, dated as of May 31, 2018, by and between Wharton Lender Associate, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.13 to the Company's Annual Report on Form 10-K, as filed with the SEC on
March 1, 2021)

Fourth amendment to Lease Agreement, dated as of October 22, 2018, by and between Wharton Lender Associate, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.14 to the Company's Annual Report on Form 10-K, as filed with the SEC on
March 1, 2021)
Fifth amendment to Lease Agreement, dated as of December 10, 2018, by and between Wharton Lender Associate, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.15 to the Company's Annual Report on Form 10-K, as filed with the SEC on
March 1, 2021)
Sixth amendment to Lease Agreement and first amendment to storage space agreement, dated as of January 13, 2021, by and between
Wharton Lender Associates, L.P. and Krystal Biotech, Inc. (incorporated by reference to Exhibit 10.17 to the Company's Annual
Report on Form 10-K, as filed with the SEC on February 28, 2022)
Seventh amendment to Lease Agreement, dated as of May 11, 2021, by and between Wharton Lender Associates, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.18 to the Company's Annual Report on Form 10-K, as filed with the SEC on
February 28, 2022)
Eighth amendment to Lease Agreement, dated as of July 21, 2021, by and between Wharton Lender Associates, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.19 to the Company's Annual Report on Form 10-K, as filed with the SEC on
February 28, 2022)
Ninth amendment to Lease Agreement, dated as of January 4, 2022, by and between Wharton Lender Associates, L.P. and Krystal
Biotech, Inc. (incorporated by reference to Exhibit 10.20 to the Company's Annual Report on Form 10-K, as filed with the SEC on
February 28, 2022)
Purchase and Sale Agreement, dated January 29, 2021, by and between Krystal Biotech, Inc. and Northfield I, LLC. (incorporated by
reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K, as filed with the SEC on February 2, 2021)
Standard Form of Contract for Construction and the corresponding General Conditions of the Contract for Construction with The
Whiting-Turner Contracting Company, dated June 30, 2021 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly
Report on Form 10-Q, as filed with the SEC on August 9, 2021)

114

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10.22

10.23#

10.24#

10.25#

10.26

10.27

16.1

21.1*
23.1*
23.2*
31.1*
31.2*
32.1*

97.1*
101

104

Guaranteed Maximum Price Amendment to Standard Form of Contract for Construction and the corresponding General Conditions of
the Contract for Construction with The Whiting-Turner Contracting Company dated September 13, 2021 (incorporated by reference to
Exhibit 10.1 to the Company’s Current Report on Form 8-K, as filed with the SEC on September 16, 2021)
Form of Krystal Biotech, Inc. 2017 IPO Stock Incentive Plan Notice of Restricted Stock Award and Restricted Stock Award
Agreement (incorporated by reference to Exhibit 10.23 to the Company's Annual Report on Form 10-K, as filed with the SEC on
February 27, 2023)
Form of Time-Based Restricted Stock Unit Award Agreement under the 2017 IPO Stock Incentive Plan (incorporated by reference to
Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q, as filed with the SEC on May 8, 2023)
Form of Performance-Based Restricted Stock Unit Award Agreement under the 2017 IPO Stock Incentive Plan (incorporated by
reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q, as filed with the SEC on May 8, 2023)
Securities Purchase Agreement, by and among Krystal Biotech, Inc. and the institutional investors listed on the signature pages thereto,
dated as of May 21, 2023 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K, as filed with the
SEC on May 22, 2023)
Registration Rights Agreement, by and among Krystal Biotech, Inc. and the institutional investors listed on the signature pages thereto,
dated as of May 21, 2023 (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K, as filed with the
SEC on May 22, 2023)
Letter to Securities and Exchange Commission from Mayer Hoffman McCann P.C. dated May 26, 2022 (incorporated by reference to
Exhibit 16.1 to the Company’s Current Report on Form 8-K, as filed with the SEC on May 26, 2022).
Subsidiaries of Krystal Biotech, Inc.
Consent of KPMG LLP
Consent of Mayer Hoffman McCann P.C.
Certification of Periodic Report by Chief Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002.
Certification of Periodic Report by Chief Accounting Officer under Section 302 of the Sarbanes-Oxley Act of 2002.
Certification of Chief Executive Officer and Chief Accounting Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002.
Executive Incentive Compensation Recoupment Policy
(i) XBRL Instance Document, (ii) XBRL Taxonomy Extension Schema Document, (iii) XBRL Taxonomy Extension Calculation
Linkbase Document, (iv) XBRL Taxonomy Extension Definition Linkbase Document, (v) XBRL Taxonomy Extension Label Linkbase
Document, (vi) XBRL Taxonomy Extension Presentation Linkbase Document.
Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101).

*    Filed herewith.
#    Indicates a management contract or compensatory plan or arrangement.

Item 16. Form 10-K Summary.

The Company has elected to not include a summary.

115

 
 
 
 
 
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 report

to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Pittsburgh, Commonwealth of Pennsylvania, on February 26, 2024.

SIGNATURES

KRYSTAL BIOTECH, INC.

By:

  /s/ Krish S. Krishnan
  Krish S. Krishnan

President and Chief Executive Officer

By:

  /s/ Kathryn A. Romano
  Kathryn A. Romano

Chief Accounting Officer

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Krish S. Krishnan
and/or Kathryn A. Romano as his or her true and lawful attorney-in-fact and agent, with the full power of substitution, for him or her and in his or her
name, place or stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Annual Report on Form 10-K,
and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and
agent, or their, his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the

registrant and in the capacities and on the dates indicated.

116

 
 
 
 
 
 
 
 
Signature

/s/ Krish S. Krishnan

Krish S. Krishnan

/s/ Kathryn A. Romano

Kathryn A. Romano

/s/ Suma M. Krishnan

Suma M. Krishnan

/s/ Daniel S. Janney
Daniel S. Janney

/s/ Dino A. Rossi
Dino A. Rossi

 /s/ Kirti Ganorkar
Kirti Ganorkar

/s/ Julian Gangolli
Julian Gangolli

/s/ Chris Mason
Chris Mason

/s/ E. Rand Sutherland
E. Rand Sutherland

/s/ Catherine Mazzacco
Catherine Mazzacco

Title

President and Chief Executive Officer and Director
(Principal Executive Officer)

Chief Accounting Officer (Principal Financial
Officer)

President, R&D and Director

   Director

   Director

   Director

Director

Director

Director

Director

117

Date

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

February 26, 2024

  
  
  
  
 
 
 
 
 
 
 
Exhibit 21.1

Subsidiaries of Krystal Biotech, Inc.

The following subsidiary constitutes a “significant subsidiary,” as defined in Rule 1-02(w) of Regulation S-X.

– Krystal Biotech Switzerland GmbH

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-273303 and 333-271167) on Form S-3ASR and (Nos.
333-269539, 333-262825, 333-252351, and 333-220589) on Form S-8 of our reports dated February 26, 2024, with respect to the
consolidated financial statements of Krystal Biotech, Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Pittsburgh, Pennsylvania
February 26, 2024

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING
FIRM

We consent to the incorporation by reference in Registration Statement on Form S-3-ASR (No. 333-271167, 333-273303) and Form S-8
(Nos.  333-269539,  333-220589,  333-252351,  333-262825)  of  our  report  dated  February  28,  2022,  with  respect  to  the  consolidated
financial  statements  of  Krystal  Biotech,  Inc.  for  the  year  ended  December  31,  2021,  included  in  this  annual  report  on  Form  10-K  of
Krystal Biotech, Inc. as of and for the year ended December 31, 2023.

/s/ Mayer Hoffman McCann P.C.

San Diego, California
February 26, 2024

 
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, Krish S. Krishnan, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Krystal Biotech, Inc.;

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 small business issuer as of, and for, the periods presented in this report;

The small business issuer'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 small business issuer 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 small business issuer, including its  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 small business issuer'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 small business issuer's internal control over financial reporting that occurred during the small
business issuer's most recent fiscal quarter (the small business issuer's fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the small business issuer's internal control over financial reporting; and

5.

The small business issuer's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial
reporting, to the small business issuer's auditors and the audit committee of the small business issuer'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 small business issuer'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 small business
issuer's internal control over financial reporting.

Date: February 26, 2024

By:

/s/ Krish S. Krishnan
Krish S. Krishnan
President and 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, Kathryn A. Romano, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Krystal Biotech, Inc.;

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 small business issuer as of, and for, the periods presented in this report;

The small business issuer'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 small business issuer 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 small business issuer, including its  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 small business issuer'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 small business issuer's internal control over financial reporting that occurred during the small
business issuer's most recent fiscal quarter (the small business issuer's fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the small business issuer's internal control over financial reporting; and

5.

The small business issuer's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial
reporting, to the small business issuer's auditors and the audit committee of the small business issuer'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 small business issuer'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 small business
issuer's internal control over financial reporting.

Date: February 26, 2024

By:

/s/ Kathryn A. Romano
Kathryn A. Romano
Chief Accounting Officer
(Principal Financial and Accounting Officer)

 
 
 
 
Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Krystal Biotech, Inc. (the “Company”) on Form 10-K for the period ending December 31, 2023 as filed

with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the
Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the
Company.

Date: February 26, 2024

Date: February 26, 2024

By:

By:

/s/ Krish S. Krishnan
Krish S. Krishnan
President and Chief Executive Officer
(Principal Executive Officer)

/s/ Kathryn A. Romano
Kathryn A. Romano
Chief Accounting Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
 
 
Exhibit 97.1

EXECUTIVE INCENTIVE COMPENSATION RECOUPMENT POLICY (Adopted August 4, 2023)

KRYSTAL BIOTECH, INC.

I.

INTRODUCTION

The Board of Directors (the “Board”) of Krystal Biotech, Inc. (the “Company”) has determined that it is in the best interests of the Company to adopt
a policy (the “Policy”) providing for the Company’s recoupment of “Erroneously Awarded Incentive-Based Compensation” (as defined below) received by
Covered Officers (as defined below) of the Company.

This Policy is intended to comply with, shall be interpreted to comply with, and shall be deemed automatically amended to comply with, Rule 10D-1

adopted under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and the Nasdaq Stock Market LLC (“Nasdaq”) Listing Rule 5608,
as such provisions may be amended from time to time, and any related rules, regulations or listing standards promulgated by the Securities and Exchange
Commission (the “SEC”) or Nasdaq, including any additional or new requirements that become effective after the last date that this Policy was adopted or
amended. Any such amendment shall be effective at such time as is necessary to comply with the applicable listing standards of Nasdaq.

II.

EFFECTIVE DATE

This Policy shall apply to all Incentive-Based Compensation (as defined below) paid or awarded to Covered Officers on or after October 2, 2023.

This Policy shall survive and continue notwithstanding any separation of a Covered Officer’s employment with the Company.

III.

DEFINITIONS

For purposes of this Policy, the following terms shall have the meanings set forth below:

“Covered Officers” shall mean current or former “Executive Officers” as such term is defined in Rule 10D-1 adopted under the Exchange Act.

“Erroneously Awarded Incentive-Based Compensation” shall mean the amount of Incentive-Based Compensation received by a Covered Officer that

exceeds the amount of Incentive-Based Compensation that otherwise would have been received had it been determined based on the information in a
Restatement (as defined below) and must be computed without regard to any taxes paid. For Incentive-Based Compensation based on stock price or total
shareholder return, where the amount is not subject to mathematical recalculation directly from the information in a Restatement, the amount must be based
on a reasonable estimate of the effect of the Restatement on the stock price or total shareholder return, as applicable, upon which the Incentive-Based
Compensation was received, and the Company must maintain documentation of that reasonable estimate and provide such documentation to Nasdaq. For
the purposes of this Policy, Incentive-Based Compensation will be deemed to be received in the fiscal period during which the financial reporting measure
specified in the applicable Incentive-Based Compensation award is attained, even if the payment or grant occurs after the end of that period.

“Incentive-Based Compensation” shall mean any compensation that is granted, earned, or vested based wholly or in part upon the attainment of a

“financial reporting measure,” which refers to measures that are determined and presented in accordance with Generally Accepted Accounting Principles
which are used in preparing the Company’s financial statements, and any measures that are derived wholly or in part from such measures. Stock price and
total shareholder return are also financial reporting measures for this purpose. For avoidance of doubt, a financial reporting measure need not be presented
within the Company’s financial statements or included in a filing with the SEC.

“Restatement” shall mean any required accounting restatement of the Company’s financial statements due to the material noncompliance of the

Company with any financial reporting requirement under the securities laws, including any required accounting restatement to correct an error in
previously issued financial statements that is

Exhibit 97.1

material to the previously issued financial statements (commonly referred to as “Big R” restatements), or to correct an error that is not material to
previously issued financial statements but would result in a material misstatement if the error were corrected in the current period or left uncorrected in the
current period (commonly referred to as “little r” restatements).

IV.

RECOUPMENT OF ERRONEOUSLY AWARDED INCENTIVE-BASED COMPENSATION

In the event of a Restatement, the Company shall recover reasonably promptly from any Covered Officer the amount of any Erroneously Awarded

Incentive-Based Compensation. Such recovery will be made without regard to any individual knowledge or responsibility of the Covered Officer with
respect to the Restatement. The Company may, subject to applicable laws, seek recovery in the manner it chooses.

In determining the amount of Erroneously Awarded Incentive-Based Compensation to be recovered from a Covered Officer pursuant to the

immediately preceding paragraph, this Policy shall apply to all Incentive-Based Compensation received by a Covered Officer: (i) after beginning service as
a Covered Officer; (ii) who served as an Covered Officer at any time during the performance period for the Incentive-Based Compensation; (iii) while the
Company has a class of securities listed on a national securities exchange or a national securities association; and (iv) during the three completed fiscal
years immediately preceding the date that the Company is required to prepare a Restatement, including any applicable transition period that results from a
change in the Company’s fiscal year within or immediately following those three completed fiscal years. For this purpose, the Company is deemed to be
required to prepare a Restatement on the earlier of: (i) the date the Board, or the Company’s officers authorized to take such action if Board action is not
required, concludes, or reasonably should have concluded, that the Company is required to prepare a Restatement; or (ii) the date a court, regulator, or other
legally authorized body directs the Company to prepare a Restatement. The Company’s obligation to recover Erroneously Awarded Incentive-Based
Compensation is not dependent on if or when the restated financial statements are filed with the SEC.

The Company shall recover the Erroneously Awarded Incentive-Based Compensation from Covered Officers unless the Board determines that
recovery is impracticable because: (i) the direct expense to a third party to assist in enforcing this Policy would exceed the amount of Erroneously Awarded
Incentive-Based Compensation; provided that the Company must make a reasonable attempt to recover the Erroneously Awarded Incentive-Based
Compensation before concluding that recovery is impracticable, document such reasonable attempt to recover the Erroneously Awarded Incentive-Based
Compensation and provide such documentation to Nasdaq; or (ii) recovery would likely cause an otherwise tax-qualified retirement plan, under which
benefits are broadly available to employees of the Company, to fail to meet the applicable requirements of 26 U.S.C. 401(a)(13) or 26 U.S.C. 411(a) and
regulations thereunder.

V.

BINDING EFFECT OF DETERMINATIONS BY BOARD; DELEGATION

The terms of this Policy shall be binding and enforceable against all persons subject to this Policy and their beneficiaries, heirs, executors,

administrators or other legal representatives. The Board may delegate to the Compensation Committee of the Board (the “Committee”) all determinations
to be made and actions to be taken by the Board under this Policy. Any determination made by the Board or the Committee under this Policy shall be final,
binding and conclusive on all parties.

VI.

SEVERABILITY

If any provision of this Policy or the application of any such provision to any Covered Officer shall be adjudicated to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provisions of this Policy, and the invalid, illegal or
unenforceable provisions shall be deemed amended to the minimum extent necessary to render any such provision or application enforceable.

VII.

NO IMPAIRMENT OF OTHER REMEDIES

This Policy does not preclude the Company from taking any other action to enforce a Covered Officer’s obligations to the Company, including

termination of employment or institution of civil or criminal proceedings against such Covered Officer. This Policy is in addition to the requirements of
Section 304 of the Sarbanes-Oxley

Exhibit 97.1

Act of 2002 that are applicable to the Company’s Chief Executive Officer and Chief Financial Officer. Any amounts paid to the Company pursuant to
Section 304 of the Sarbanes-Oxley Act of 2002 shall be considered in determining any amounts recovered under this Policy. Notwithstanding the terms of
any other policy, program, agreement or arrangement, in no event will the Company indemnify or reimburse any Covered Officer for any amounts that are
recovered under this Policy, and in no event will the Company pay premiums on any insurance policy that would cover a Covered Officer’s potential
obligations with respect to Erroneously Awarded Incentive-Based Compensation. If a Covered Officer fails to repay Erroneously Awarded Incentive-Based
Compensation that is owed to the Company under this Policy, the Company shall take all appropriate action to recover such Erroneously Awarded
Incentive-Based Compensation from the Covered Officer, and the Covered Officer shall be required to reimburse the Company for all expenses (including
legal expenses) incurred by the Company in recovering such Erroneously Awarded Incentive-Based Compensation.

VIII.

INTERPRETATION

This Policy shall be interpreted in a manner that is consistent with Rule 10D-1 under the Exchange Act, Rule 5608 of the Nasdaq listing rules and

any related rules or regulations adopted by the Securities and Exchange Commission or Nasdaq (the “Applicable Rules”) as well as any other applicable
law. To the extent the Applicable Rules require recovery of incentive-based compensation in additional circumstances beyond those specified above,
nothing in this Policy shall be deemed to limit or restrict the right or obligation of the Company to recover incentive-based compensation to the fullest
extent required by the Applicable Rules.

IX.

ACKNOWLEDGEMENT

Each Covered Officer shall sign and return to the Company, within 30 calendar days following the later of (i) the effective date of this Policy first
set forth above or (ii) the date the individual becomes a Covered Officer, the Acknowledgement Form attached hereto as Exhibit A, pursuant to which the
Covered Officer agrees to be bound by, and to comply with, the terms and conditions of this Policy.

Exhibit 97.1

EXHIBIT A

KRYSTAL BIOTECH, INC.

EXECUTIVE INCENTIVE COMPENSATION RECOUPMENT POLICY

ACKNOWLEDGEMENT FORM

By signing below, the undersigned acknowledges and confirms that the undersigned has received and reviewed a copy of the Krystal Biotech, Inc. (the
“Company”) Executive Incentive Compensation Recoupment Policy (the “Policy”).

By signing this Acknowledgement Form, the undersigned acknowledges and agrees that the undersigned is and will continue to be subject to the Policy and
that the Policy will apply both during and after the undersigned’s employment with the Company. Further, by signing below, the undersigned agrees to
abide by the terms of the Policy, including, without limitation, by returning any Erroneously Awarded Incentive-Based Compensation (as defined in the
Policy) to the Company to the extent required by, and in a manner consistent with, the Policy.

COVERED OFFICER

Signature

Print Name

Date