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REGENXBIO Inc.

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

FORM 10-K

(Mark One)
☒

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

For the fiscal year ended December 31, 2021
or

☐

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

For the transition period from                     to
Commission file number: 001-37553

REGENXBIO Inc.

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of
incorporation or organization)

47-1851754
(I.R.S. Employer
Identification Number)

9804 Medical Center Drive
Rockville, MD 20850
(240) 552-8181
(Address of principal executive offices and Zip Code, and telephone number, including area code)

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

Title of each class
Common Stock, par value $0.0001 per share

Trading symbol(s)
RGNX

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

Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☒    No  ☐
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ☐    No  ☒
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months

(or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 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

Accelerated filer

Non-accelerated filer

☒  
☐  

Smaller reporting company

Emerging growth company

☐

☐

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting

standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under

Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.    ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ☐     No  ☒
The aggregate market value of common stock held by non-affiliates of the registrant based on the closing price of the registrant’s common stock as reported on The Nasdaq Global Select

Market on June 30, 2021, the last business day of the registrant’s most recently completed second quarter, was $1,310,113,569.

As of February 24, 2022, there were 42,949,562 shares of the registrant’s common stock, par value $0.0001 per share, issued and outstanding.

Specified portions of the registrant’s definitive proxy statement with respect to the registrant’s 2022 Annual Meeting of Stockholders, which is to be filed pursuant to Regulation 14A

within 120 days after the end of the registrant’s fiscal year ended December 31, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K.

DOCUMENTS INCORPORATED BY REFERENCE

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

REGENXBIO INC.

Form 10-K

For the Year Ended December 31, 2021

Table of Contents

Part I

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

Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.
Item 9C.

Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

  Information Regarding Forward-Looking Statements
  Industry and Market Data
  Business
  Risk Factors
  Unresolved Staff Comments
  Properties
  Legal Proceedings
  Mine Safety Disclosures

Part II

  Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
  Reserved
  Management’s Discussion and Analysis of Financial Condition and Results of Operations
  Quantitative and Qualitative Disclosures about Market Risk
  Financial Statements and Supplementary Data
  Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
  Controls and Procedures
  Other Information
  Disclosure Regarding Foreign Jurisdictions That Prevent Inspections

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

Part III

Part IV

  Exhibits, Financial Statement Schedules
  Form 10-K Summary

Item 15.
Item 16.
Index to Consolidated Financial Statements
Exhibit Index
Signatures

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PART I

INFORMATION REGARDING 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 (the Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange Act). These statements express a belief,
expectation or intention and are generally accompanied by words that convey projected future events or outcomes such as “believe,” “may,” “will,”
“estimate,” “continue,” “anticipate,” “assume,” “design,” “intend,” “expect,” “could,” “plan,” “potential,” “predict,” “seek,” “should,” “would” or by
variations of such words or by similar expressions. We have based these forward-looking statements on our current expectations and assumptions and
analyses in light of our experience and our perception of historical trends, current conditions and expected future developments, as well as other factors we
believe are appropriate under the circumstances. However, whether actual results and developments will conform with our expectations and predictions is
subject to a number of risks, uncertainties, assumptions and other important factors, including, but not limited to:

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the impact of the COVID-19 pandemic on our business, operations and preclinical and clinical development timelines and plans;

our ability to establish and maintain development partnerships, including our collaboration with AbbVie to develop and commercialize RGX-
314;

our ability to obtain and maintain regulatory approval of our product candidates and the labeling for any approved products;

the timing of enrollment, commencement and completion and the success of our clinical trials;

the timing of commencement and completion and the success of preclinical studies conducted by us and our development partners;

the timely development and launch of new products;

the scope, progress, expansion and costs of developing and commercializing our product candidates;

our ability to obtain, maintain and enforce intellectual property protection for our product candidates and technology, and defend against
third-party intellectual property-related claims;

our expectations regarding the development and commercialization of product candidates currently being developed by third parties that
utilize our technology;

our anticipated growth strategies;

our expectations regarding competition;

the anticipated trends and challenges in our business and the market in which we operate;

our ability to attract or retain key personnel;

the size and growth of the potential markets for our product candidates and the ability to serve those markets;

the rate and degree of market acceptance of any of our products that are approved;

our expectations regarding our expenses and revenue;

our expectations regarding the outcome of legal proceedings;

our expectations regarding regulatory developments in the United States and foreign countries; and

our ability to accurately predict how long our existing cash resources will be sufficient to fund our anticipated operating expenses.

You should carefully read the factors discussed in the sections titled “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition
and Results of Operations” and elsewhere in this Annual Report on Form 10-K and in our other filings with the U.S. Securities and Exchange Commission
(the SEC) for additional discussion of the risks, uncertainties, assumptions and other important factors that could cause our actual results or developments
to differ materially and adversely from those projected in the forward-looking statements. The actual results or developments anticipated may not be
realized or, even if substantially realized, they may not have the expected consequences to or effects on us or our businesses or operations. Such statements
are not guarantees of future performance and actual results or developments may differ materially and adversely from those projected in the forward-

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looking statements. These forward-looking statements speak only as of the date of this report. Except as required by law, we disclaim any duty to update
any forward-looking statements, whether as a result of new information, future events or otherwise.

As used in this Annual Report on Form 10-K, the terms “REGENXBIO,” “we,” “us,” “our” or the “Company” mean REGENXBIO Inc. and its

subsidiaries, on a consolidated basis, unless the context indicates otherwise.

AAVIATE, NAV, REGENXBIO and the REGENXBIO logos are our registered trademarks. Any other trademarks appearing in this Annual Report

on Form 10-K are the property of their respective holders.

INDUSTRY AND MARKET DATA

We obtained the industry, market and competitive position data used throughout this Annual Report on Form 10-K from our own internal estimates

and research, as well as from industry and general publications, in addition to research, surveys and studies conducted by third parties. Internal estimates
are derived from publicly-available information released by industry analysts and third-party sources, our internal research and our industry experience, and
are based on assumptions made by us based on such data and our knowledge of our industry and market, which we believe to be reasonable. We have not
independently verified industry, market and competitive position data from third-party sources, but we believe the sources of such information to be
reliable. While we believe the industry, market and competitive position data included in this Annual Report on Form 10-K is reliable and is based on
reasonable assumptions, such data involves risks and uncertainties and are subject to change based on various factors, including those discussed in “Risk
Factors.” These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties and by us.

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ITEM 1.

BUSINESS

Overview

We are a leading clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy. Our investigational
gene therapies are designed to deliver functional genes to address genetic defects in cells, enabling the production of therapeutic proteins or antibodies that
are intended to impact disease. Through a single administration, gene therapy could potentially alter the course of disease significantly and deliver
improved patient outcomes with long-lasting effects.

Our investigational gene therapies use adeno-associated virus (AAV) vectors from our proprietary gene delivery platform, which we call our NAV®
Technology Platform. AAV vectors are non-replicating viral delivery vehicles that are not known to cause disease. Our NAV Technology Platform consists
of exclusive rights to a large portfolio of AAV vectors, including AAV7, AAV8, AAV9, AAVrh10 and more than 100 other novel AAV vectors (NAV
Vectors). We believe this platform forms a strong foundation for our current clinical-stage programs and with our ongoing research and development, we
expect to continue to expand our platform and pipeline of potential AAV vector-based gene therapies. We refer to commercial and investigational AAV
vector-based gene therapies as AAV Therapeutics.

We have developed a broad pipeline of investigational AAV Therapeutics using our NAV Technology Platform as a one-time treatment to address an

array of diseases. We are currently focusing our internal development pipeline in three areas: retinal, neuromuscular and neurodegenerative diseases. Our
investigational AAV Therapeutics include:

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•

•

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RGX-314, which we are developing in collaboration with AbbVie to treat large patient populations impacted by wet age-related macular
degeneration (wet AMD), diabetic retinopathy (DR) and other chronic retinal diseases characterized by loss of vision.

RGX-202, which we are developing to treat Duchenne muscular dystrophy (Duchenne), one of the most common fatal genetic disorders
affecting children.

RGX-121, RGX-111 and RGX-181, which we are developing to treat Mucopolysaccharidosis type II (MPS II), Mucopolysaccharidosis type I
(MPS I), and late infantile neuronal ceroid lipofuscinosis type II (CLN2 disease), all of which are progressive, neurodegenerative lysosomal
storage disorders.

RGX-381, which we are developing to treat the ocular manifestations of CLN2 disease.

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Our internal pipeline is shown below.

We believe that we have a strong pipeline of AAV Therapeutics with the potential to deliver one-time treatments to patients living with common and

rare diseases, and we expect to have more product candidates to come.

We believe our integrated, end-to-end expertise in discovering and developing AAV Therapeutics distinguishes us from other gene therapy
companies. We have built a team of experts in research and development, scalable manufacturing and preclinical and clinical development. As a result, we
believe we have the resources and capabilities to conduct early research and preclinical testing, advance AAV Therapeutics into clinical development and
manufacture new potential therapies for patients.

We believe our history, science, resources, people and values combine to make us an industry leader in gene therapy and the development of
potentially ground-breaking AAV Therapeutics. As such, we believe we are well-positioned to achieve our mission to improve lives through the curative
potential of gene therapy.

We believe AAV Therapeutics represent a simplified and efficient potential new class of innovative medicines. We believe that our end-to-end
capabilities to develop, manufacture and clinically advance AAV Therapeutics will support the achievement of our 2025 goals, such that by the end of
2025, we can grow into a company with multiple AAV Therapeutics that are FDA-approved or in pivotal trials through our internal and partnered programs
that can help ensure our continued growth.

AAV Therapeutics

Historically, the primary challenge for gene therapy has been the safe and effective delivery of genes into cells. Genes are made of DNA, which is a
large, highly charged molecule that is difficult to transport across a cell membrane and deliver to the nucleus, where it can be transcribed and translated into
protein. The genetic material needs to be delivered efficiently and to the desired target tissues and cell types, which will vary depending on the disease to be
treated. Based on this need, scientists have designed and developed a variety of gene vectors in order to facilitate gene delivery in cells.

We focus on in vivo gene therapy. Among vectors available for in vivo gene therapy, viral vectors have been adopted frequently due to their

demonstrated efficiency in gene delivery to date. Since AAVs are not known to be associated with disease in humans, vectors derived from AAV have
promising safety profiles for gene therapy.

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Our NAV Technology Platform

In 2009, we acquired exclusive rights to our NAV Technology Platform. Our NAV Technology Platform includes over 100 NAV Vectors, as well as

vectors that are at least 95% identical to any NAV Vector, that provide the foundation for the development of new AAV Therapeutics. We have observed
that several of our NAV Vectors demonstrate preferential tropisms for a range of tissues, as well as efficient transgene delivery and expression that may
produce a therapeutic effect. Our NAV Technology Platform has enabled the development of a number of AAV Therapeutics being investigated in clinical
trials and one that is FDA-approved.

For many years, by sublicensing NAV Vectors from our NAV Technology Platform to other biopharmaceutical companies with disease-specific

expertise, which we refer to as our NAV Technology Licensees, we received capital to advance our own research and capabilities.  Our NAV Technology
Platform is being applied to a number of programs over a broad range of therapeutic areas and disease indications by our NAV Technology Licensees.
These partnered programs include Novartis’ Zolgensma®, a gene therapy for the treatment of spinal muscular atrophy (SMA), which was approved by the
U.S. Food and Drug Administration in 2019, and has been used to treat over 1,800 patients suffering from SMA, a debilitating and potentially deadly
disease. Our partnering strategy provides us the flexibility to sublicense development of treatments designed to address significant unmet medical needs,
while remaining focused on our own pipeline of AAV Therapeutics.

We believe we have extensive human safety experience to support the development of our investigational AAV Therapeutics based on data from

over 2,000 patients dosed with AAV Therapeutics derived from our NAV Technology Platform in more than 20 different clinical-stage programs and with
one FDA approved product. To date, we have observed that AAV Therapeutics derived from our NAV Technology Platform have been generally well
tolerated.  

Our AAV Therapeutic Platform

Discovery and Development of AAV Therapeutics

We have a team of scientists and engineers dedicated to expanding the understanding and applications of AAV vectors, applying the differentiated
capabilities of the NAV Technology Platform and exploring the potential to generate new, innovative AAV Therapeutics. We endeavor to rapidly discover
and develop a pipeline of investigational AAV Therapeutics with the potential, through a single administration, to alter the course of disease significantly
and deliver improved patient outcomes with long-lasting effects. We believe that we have created a reproducible process and modular platform for the
discovery and development of innovative AAV Therapeutics.

Our scientists are continuing to conduct research to evaluate NAV Vectors to identify and characterize more clinically relevant features and benefits.

We are also engineering novel capsids by leveraging the natural diversity of our NAV Vectors and our detailed knowledge of AAV structure and function.
We are designing additional NAV Vectors with new features that may enhance tissue and cell type specificity, increase potency and potentially improve the
safety profile of AAV Therapeutics. Through our internal efforts and collaborations, we are also designing novel vectors to which we add high affinity
targeting domains with the goal of enabling them to deliver genes more precisely to specific tissues and cells.

With AAV Therapeutics, the gene is eventually transported to the cell nucleus where it is transcribed into RNA. The production of RNA in the cell is

controlled by transcriptional elements called enhancers and promoters that are linked to the gene. We have designed optimized enhancer and promoter
combinations with the goal of enabling sustained gene expression and potentially increasing durability of therapeutic effect.

We can design our AAV Therapeutics to deliver genes for a spectrum of therapeutic modalities. Our current pipeline of investigational AAV
Therapeutics use NAV Vectors to deliver genes for a therapeutic antibody, or a functional gene to compensate for a missing or non-functional gene.

We also conduct research studying the potential of NAV Vectors to deliver modified RNA, such as microRNA (miRNA) or antisense sequences,

which could alter the structure or silence an RNA transcript. We have created a platform for designing efficient miRNAs to address targets of interest while
avoiding off-target effects and cellular toxicity. In addition, NAV Vectors have been designed to enable in vivo gene editing, which involves the alteration
of a gene via targeted insertion or deletion of DNA base pairs.

In addition to our research evaluating NAV Vectors, we also work on identifying potential indications for the development of new AAV

Therapeutics, guided by our expertise and experience in bringing AAV Therapeutics to the clinical stage. Our early evaluation of targets includes scientific
rationale and cross-functional analysis of technical feasibility. In our exploratory research, we

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work internally and through collaborations with external researchers to identify and optimize AAV Therapeutics based on AAV vector targeting, gene
optimization and evaluation of effective delivery devices. We then execute proof-of-concept research that informs the next steps in our pipeline strategy.
While much of our research into potential AAV Therapeutics extends from our clinical expertise in eye diseases, AAV-mediated antibody delivery,
neurodegenerative diseases and neuromuscular diseases, we are also able to research potential opportunities to advance AAV Therapeutics for new disease
areas.

Our platform capabilities include a team of scientists that develop analytical assays and approaches to support our preclinical and clinical-stage
pipeline. The ability to determine dose levels, biodistribution, and target engagement requires an understanding of complex variables that are related to
properties of both the NAV Vector and the gene, and dependent on the delivery device. We believe that our analytical capabilities are at the forefront of
AAV Therapeutic development.

AAV Therapeutic Manufacturing

Our research team works closely with our manufacturing team, allowing us to evaluate the manufacturability of AAV Therapeutics early in the

discovery process. Through our ability to collaborate cross-functionally, we can move quickly from candidate selection to the manufacturing of clinical-
grade material, which we believe allows us to accelerate the process of developing AAV Therapeutics.

We have invested in innovative manufacturing process development and analytical capabilities and use a suspension cell culture-based

manufacturing process. We have deep in-house knowledge of biologics manufacturing, which we believe will enable us to scale manufacturing of our AAV
Therapeutics while ensuring product quality for patients. We have developed systems which we believe will provide robust manufacturing and global
supply of AAV Therapeutics to meet quality requirements and anticipated research, clinical, and future commercial demand. Our planned Good
Manufacturing Practices (cGMP) production facility, located in our new corporate headquarters in Rockville, Maryland, has been designed to support
production of AAV Therapeutics.

We have developed a proprietary, high-yielding manufacturing process platform for NAV vector production that can be applied across multiple AAV

Therapeutics. The suspension-based manufacturing platform has demonstrated robust scalability from bench-scale to 500 liter and 1,000-liter cGMP
batches with consistent yield and product purity demonstrated via comparability studies. At our manufacturing facility, we expect to scale the
manufacturing process to 2,000 liters. We believe this flexibility in manufacturing will support a wide range of potential commercial supply requirements
for our AAV Therapeutics.

We have developed product formulations specific to our different delivery devices and routes of administration. We aim to ensure that our

formulations are designed and assessed to ensure product stability can be maintained for numerous years and that our AAV Therapeutics can be exposed to
a variety of handling and delivery procedures.  

We have endeavored to design our platform manufacturing process, formulations and devices to enable efficient transition from research to clinical

trials to commercial readiness, while minimizing changes during product development. To support our platform, we have developed a comprehensive set of
analytical methods to assess quality and characterize the product. We continue to expand and enhance internal analytical lab capabilities with the aim of
improving quality and control and supporting accelerated development of AAV Therapeutics.

We have agreements with several biologics contract development and manufacturing organizations (CDMOs) for production of material under
cGMP requirements to support our current and future clinical trials, as well as potential future commercialization of our investigational AAV Therapeutics.
We select our CDMOs based on capability, capacity and expertise, and we believe partnering with multiple CDMOs provides us with flexibility and
diversity in suppliers, as well as access to future capacity to accommodate clinical trials and commercialization. We have a strategic partnership with
FUJIFILM Diosynth Biotechnologies for the manufacture of our investigational AAV Therapeutics. Under the terms of the agreement, we secured capacity
for the supply of cGMP NAV Vector drug substance produced at scales up to 2,000 liters. We also have agreements with several CDMOs for cGMP final
drug product manufacturing and have produced numerous batches for our clinical trials.

AAV Therapeutic Delivery Devices

We believe that a critical component of AAV Therapeutic development is to deliver treatments safely, effectively and efficiently to the right part of

the body.  We leverage the differentiated characteristics of NAV Vectors to target different tissues and cells. To further enhance the profile of AAV
Therapeutics, we have developed a platform of different devices to assist in the delivery of AAV Therapeutics using multiple routes of administration to
tissues and cells.

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We have developed significant expertise in designing delivery device systems for use with AAV Therapeutics and have also developed and in-

licensed relevant intellectual property, including know-how, related to delivery devices. Our research and development activities have involved several
delivery device advancements for AAV Therapeutics. We focus research on designing features and implementing delivery device solutions that we believe
have the potential to improve the effect, patient safety, caregiver usability and cost-of-goods of AAV Therapeutics.

We have advanced image-guided device delivery of AAV Therapeutics into the cerebrospinal fluid to target the brain and central nervous system for

neurodegenerative diseases. In 2018, in our clinical trial for the treatment of MPS II, an investigational AAV Therapeutic was delivered to a patient using
an intracisternal delivery device for the first time. We have also led the development of two different types of delivery devices of AAV Therapeutics into
the eye for targeting the retina of patients. In 2020, in our clinical trial for the in-office treatment of wet AMD, an investigational AAV Therapeutic was
delivered to a patient using a novel, suprachoroidal delivery device for the first time. In 2020, we initiated a pivotal phase program for RGX-314 using an
automated subretinal delivery device for the treatment of wet AMD.  As part of our delivery device expertise, we have created teams of experts to support
and train physicians to deliver AAV Therapeutics in operating room and physician office settings.

In recent years, a tremendous amount of progress has been made in the development of AAV Therapeutics, and we believe we have been a leader in

these advancements.

Our Investigational AAV Therapeutics

We are currently focusing our internal development pipeline in three areas: retinal diseases, neuromuscular diseases and neurodegenerative diseases.

RGX‑314 for the Treatment of Wet AMD, DR and Other Chronic Retinal Diseases

We are developing RGX‑314 in collaboration with AbbVie as a potential one-time treatment for wet AMD, DR and other chronic retinal diseases.

These diseases are characterized by loss of vision due to excess fluid accumulation from new blood vessel formation and treated with anti-vascular
endothelial growth factor (anti-VEGF) therapies.

Wet AMD is the leading cause of vision loss in people over 60, affecting more than 2 million patients in the United States, Europe and Japan. The

risk for developing wet AMD increases with age and we anticipate that the incidence of new cases will continue to increase significantly with the growth of
the aging population. In patients with wet AMD, fluid accumulation can result in physical changes in the structure of the retina and adverse changes in
vision. As this process progresses, blindness can result from atrophy and scar formation.

DR is a complication of diabetes and is the leading cause of blindness in adults between 24 and 75 years of age worldwide. It is a progressive
retinopathy, and the spectrum of DR severity ranges from non-proliferative diabetic retinopathy (NPDR) to proliferative diabetic retinopathy (PDR). As DR
progresses, a large proportion of patients develop vision-threatening complications, including diabetic macular edema (DME) and neovascularization that
can lead to blindness. An estimated 27 million patients are affected with DR across the US, Europe and Japan, and of those, there are more than 23 million
DR patients without center-involved DME. DR is the leading cause of vision loss in working-age adults and the incidence is expected to continue to grow
significantly with the prevalence of diabetes.

Frequent anti-VEGF injections in the eye have been shown to reduce the risk of blindness in randomized controlled clinical trials and are approved
for the treatment of wet AMD and DR. The current standard-of-care anti-VEGF treatments require patients to receive injections in the eye every four to 12
weeks for the duration of the disease. Real world evidence shows that patients with wet AMD are severely undertreated, and DR patients with early non-
proliferative disease are often not treated due to the unsustainable treatment burden of administering frequent injections required with currently approved
anti-VEGF therapies. As a result, the majority of wet AMD patients experience significant vision loss over time and most patients with early non-
proliferative DR progress to more severe forms of the proliferative disease, developing common vision-threatening complications such as center-involved
DME and proliferative DR.

RGX‑314 is being developed as a novel, one-time treatment that includes the NAV AAV8 vector containing a gene for a monoclonal antibody
fragment designed to inhibit VEGF activity, modifying the pathway for formation of new leaky blood vessels and retinal fluid accumulation. After delivery
of RGX‑314, we believe retinal cells will continue to produce the anti-VEGF protein. Two separate routes of administration of RGX-314 to the eye are
being evaluated: a subretinal delivery procedure as well as a

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targeted, in-office administration to the suprachoroidal space. We have licensed certain exclusive rights to the SCS Microinjector® from Clearside
Biomedical, Inc. (Clearside) to deliver gene therapy treatments to the suprachoroidal space of the eye.  

Clinical Development of RGX‑314 for the Treatment of Wet AMD

We have initiated two pivotal trials, ATMOSPHERE™ and ASCENT™, for the treatment of wet AMD using RGX-314 delivered subretinally, and

we expect these pivotal trials to support a Biologics Licensing Application (BLA) submission in 2024. ATMOSPHERE and ASCENT are multi-center,
randomized, active-controlled trials to evaluate the efficacy and safety of a single-administration of RGX-314 versus standard of care in patients with wet
AMD. Both trials are active and enrolling patients. We initiated the pivotal program using cGMP material produced from our existing manufacturing
process and plan to incorporate our scalable suspension cell culture manufacturing process to support future commercialization, upon completion of a
bridging study.

We are also evaluating the efficacy, safety and tolerability of suprachoroidal delivery of RGX-314 through AAVIATE®, a multi-center, open label,

randomized, controlled, dose-escalation Phase II trial of RGX-314 for the treatment of wet AMD.  Enrollment in AAVIATE is complete in Cohort 4 and
expected to be completed in Cohort 5 in the first half of 2022.

In November 2021, we announced additional positive interim data from AAVIATE.  As of November 4, 2021, RGX-314 continued to be well

tolerated in 50 patients from Cohorts 1-3 with no drug-related serious adverse events (SAEs) in AAVIATE.  At six months following one-time
administration of RGX-314, stable visual acuity and retinal thickness, as well as a meaningful reduction (>70%) in anti-VEGF treatment burden was
observed in patients in Cohort 2, with 40% of patients anti-VEGF injection-free.  Mild intraocular inflammation observed on slit-lamp examination was
reported at similar incidence across both dose levels in Cohorts 1 and 2, with four out of 15 patients in Cohort 1 and three out of 15 patients in Cohort 2.
All cases of inflammation in both cohorts were resolved within days to weeks on topical corticosteroids.

Clinical Development of RGX‑314 for the Treatment of DR

We are evaluating the efficacy, safety and tolerability of suprachoroidal delivery of RGX-314 for the treatment of DR in ALTITUDETM, a multi-
center, open label, randomized, controlled, dose-escalation Phase II trial. We expect to complete enrollment in ALTITUDE in Cohorts 2 and 3 in the first
half of 2022.

In February 2022, we presented positive interim data from ALTITUDE.  As of January 18, 2022, suprachoroidal delivery of RGX-314 continued to
be well tolerated in the 15 patients dosed with RGX-314 in Cohort 1, with no drug-related SAEs, and no intraocular inflammation observed. Of the patients
dosed with RGX-314 in Cohort 1, 47% demonstrated a two-step or greater improvement from baseline on the Early Treatment Diabetic Retinopathy Study-
Diabetic Retinopathy Severity Scale (ETDRS-DRSS) at six months, compared to 0% in the observational control group. One patient (7%) dosed with
RGX-314 continued to demonstrate a four-step improvement. The percentage of Cohort 1 patients dosed with RGX-314 achieving at least two-step
improvement at six months in RGX-314 treated eyes (47%) increased from the previously reported three-month results (33%).

RGX-202 for the Treatment of Duchenne

RGX-202 is our investigational AAV Therapeutic for the treatment of Duchenne, a rare disease caused by mutations in the gene responsible for
making dystrophin, a protein of central importance for muscle cell structure and function. Without dystrophin, muscles throughout the body degenerate and
become weak, eventually leading to loss of movement and independence, required support for breathing, cardiomyopathy and premature death. There is
presently no cure for Duchenne, and for most patients, there are no satisfactory disease modifying treatments available. Duchenne is one of the most
common fatal genetic disorders affecting children, primarily boys. Duchenne is estimated to occur in approximately one in every 3,500-5,000 live male
births and has an estimated prevalence of more than 30,000 cases in the U.S., Europe and Japan.  

RGX-202 is designed to deliver a transgene for a novel microdystrophin that includes the functional elements of the C-Terminal (CT) domain found

in naturally occurring dystrophin. Presence of the CT domain has been shown in preclinical studies to recruit several key proteins to the muscle cell
membrane, leading to improved muscle resistance to contraction-induced muscle damage in dystrophic mice. Additional design features, including codon
optimization and reduced CpG content, may potentially improve gene expression, increase translational efficiency and reduce immunogenicity. RGX-202 is
designed to support the delivery and targeted expression of genes throughout skeletal and heart muscle using the NAV AAV8 vector, and a well-
characterized muscle-specific promoter (Spc5-12).

We have received orphan drug product designation and rare pediatric disease designation from the FDA for RGX‑202.

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Planned Clinical Development of RGX-202

We have received clearance of our Investigational New Drug (IND) application by the FDA to evaluate RGX-202 in a first-in-human, Phase I/II

clinical trial, named AFFINITY DUCHENNETM, which is expected to initiate in the first half of 2022. This will be a multicenter, open-label dose
escalation and dose expansion clinical trial to evaluate the safety, tolerability and clinical efficacy of RGX-202 in patients with Duchenne.

RGX‑121 for the Treatment of MPS II

RGX‑121 is our investigational AAV Therapeutic for the treatment of MPS II. MPS II, also known as Hunter syndrome, is a rare disease caused by a

deficiency of the IDS gene which encodes the I2S enzyme. I2S is responsible for the breakdown of polysaccharides called heparan sulfate (HS) and
dermatan sulfate (DS) in lysosomes, which are structures that dispose of waste products inside cells. These polysaccharides, called glycosaminoglycans
(GAGs), accumulate in tissues of MPS II patients, resulting in diverse clinical signs and symptoms. HS is a key biomarker of I2S enzyme activity and high
amounts of HS accumulate in the central nervous system (CNS) of MPS II patients, which has been shown to correlate with neurocognitive manifestations
of the disease. In severe forms of the disease, early developmental milestones may be met during the first year after birth, but developmental delay is
readily apparent by 18 to 24 months. Developmental progression begins to plateau between three and five years of age, with regression reported to begin
around six and a half years. By the time of death, most patients with CNS involvement are severely mentally handicapped and require constant care. MPS
II is estimated to occur in approximately 1 in 100,000 to 1 in 170,000 births worldwide. Based on global population, this equates to approximately 500 to
1,000 MPS II patients born each year worldwide.

Enzyme replacement therapy (ERT), the current standard of care for patients with MPS II, does not treat CNS manifestations of the disease

because the enzyme cannot cross the blood-brain barrier. We believe that specific treatment to address the neurological manifestations of MPS II and
prevent or stabilize cognitive decline remains a significant unmet medical need.

RGX‑121 is designed to use the NAV AAV9 vector to deliver the human IDS gene to cells in the CNS. Delivery of the gene therapy and expression

of the enzyme that is deficient within cells in the CNS could provide a permanent source of secreted I2S on the CNS side of the blood-brain barrier,
allowing for long-term cross-correction of cells throughout the CNS. We believe this strategy could provide rapid I2S delivery to the brain, potentially
preventing the progression of cognitive deficits that otherwise occur in MPS II patients.

We have received orphan drug product designation, rare pediatric disease designation and Fast Track designation from the FDA, as well as orphan

designation and advanced therapy medicinal products (ATMP) classification from the European Medicines Agency (the EMA) for RGX‑121.

Clinical Development of RGX‑121 for the Treatment of MPS II

A Phase I/II clinical trial of RGX‑121 in patients with MPS II under the age of 5 years old to evaluate the safety and tolerability of RGX-121, as
well as the effects of RGX-121 on biomarkers of I2S enzyme activity, neurocognitive development and other clinical measures, is ongoing. The primary
endpoint is safety. The secondary and exploratory endpoints include the effect of RGX‑121 on biomarkers of I2S activity in the cerebrospinal fluid (CSF),
serum and urine, and the effect of RGX‑121 on neurocognitive deficits, as well as other clinical outcome measures.

In February 2022, we announced additional positive interim data from the Phase I/II trial of RGX-121.  As of December 20, 2021, RGX-121
continued to be well-tolerated with no drug-related SAEs across three dose levels with preliminary results indicating dose-dependent reductions in key CSF
biomarkers with patients in Cohort 3 approaching normal levels of the D2S6 biomarker. Measures of neurodevelopmental function from patients in Cohorts
1 and 2 demonstrated continued developmental skill acquisition up to 2 years after RGX-121 administration. Evidence of systemic enzyme expression and
biomarker activity continued to be observed. We plan to initiate a Cohort 3 expansion using commercial-scale cGMP material in the first quarter of 2022.

A second multicenter, open-label Phase I/II trial of RGX-121 for the treatment of pediatric patients with severe MPS II ages 5-18 years old is
ongoing. The trial is designed to evaluate the safety of a single administration of RGX-121, the effects of RGX-121 on biomarkers of I2S enzyme activity,
and changes in cognitive function, adaptive behavior, daily function and quality of life.

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RGX‑111 for the Treatment of MPS I

RGX-111 is our investigational AAV Therapeutic for the treatment of MPS I, a rare disease caused by deficiency of IDUA, an enzyme required for

the breakdown of polysaccharides in lysosomes. Similar to MPS II, many MPS I patients develop symptoms related to GAG accumulation in the CNS,
which can include excessive accumulation of fluid in the brain, spinal cord compression and cognitive impairment. MPS I patients span a broad spectrum
of disease severity and extent of CNS involvement. The severe form of MPS I is also referred to as Hurler syndrome. Hurler patients have two mutations in
the IDUA gene, resulting in no active enzyme. These patients typically present with symptoms before two years of age and universally exhibit severe
cognitive decline after an initial period of normal development. MPS I is estimated to occur in approximately 1 in 100,000 births worldwide. Based on
global population, this equates to more than 1,000 MPS I patients born each year worldwide. 

The current standard of care for patients with an attenuated form of MPS I is a recombinant form of human IDUA, given as a weekly ERT infusion.

This has demonstrated improvement in hepatosplenomegaly, growth, mobility and respiratory function. However, as the enzyme cannot cross the blood-
brain barrier, ERT does not treat the CNS manifestations of MPS I. Patients are also often treated with hematopoietic stem cell transplantation (HSCT) and,
although this approach has demonstrated improvements in survival, growth, cardiac and respiratory function, mobility and intellect, it is also associated
with clinically relevant morbidity and an estimated 10% to 20% mortality. Accordingly, the procedure is reserved for patients with severe disease before
two years of age because the risk-benefit ratio is thought to be more favorable in younger patients who have not yet experienced advanced cognitive
decline. Another critical limitation of HSCT is that cognitive decline continues for up to a year after transplant before stabilizing, leaving permanent
cognitive deficits. Overall, we believe the limitations of HSCT and ERT leave a significant unmet need for a method to safely achieve long-term IDUA
reconstitution in the CNS for MPS I patients experiencing neurological complications.

RGX‑111 is designed to use the NAV AAV9 vector to deliver the human IDUA gene to the CNS. Delivery of the enzyme that is deficient within

cells in the CNS could provide a permanent source of secreted IDUA beyond the blood-brain barrier, allowing for long-term cross-correction of cells
throughout the CNS. We believe this strategy could also provide rapid IDUA delivery to the brain, potentially preventing the progression of cognitive
deficits that otherwise occurs in MPS I patients.

We have received orphan drug product designation, rare pediatric disease designation and fast track designation from the FDA, as well as orphan

designation and ATMP classification from the EMA for RGX‑111.

Clinical Development of RGX‑111 for the Treatment of MPS I

We are currently enrolling patients in a Phase I/II clinical trial of RGX‑111. The trial is a multi-center, open-label, dose escalation trial that is
evaluating the safety, tolerability and pharmacodynamics of RGX-111 delivered to patients with MPS I. The primary endpoint of this trial is safety, and the
secondary endpoints include the effect of RGX‑111 on biomarkers of IDUA activity in the CSF, serum and urine, neurocognitive development and other
outcome measures.

In addition, RGX-111 was administered to a patient with MPS I through a single-patient IND.

In February 2022, we announced positive initial data from the Phase I/II trial, as well as positive interim data from the single patient IND of RGX-

111. As of December 20, 2021, RGX-111 was well tolerated across two dose levels in the Phase I/II trial and in the single-patient IND, with no drug-related
SAEs. Biomarker and neurodevelopmental assessments indicated an encouraging CNS profile in patients dosed with RGX-111, with emerging evidence of
systemic biomarker activity observed. We plan to enroll additional patients in a Cohort 2 expansion of the Phase I/II trial in the first half of 2022.

RGX‑181 and RGX-381 for the Treatment of CLN2 Disease

CLN2 disease, a form of Batten disease, is a rare disease caused by mutations in the tripeptidyl peptidase 1 (TPP1) gene. Mutations in the TPP1
gene and subsequent deficiency in TPP1 enzyme activity result in lysosomal accumulation of storage material and degeneration of tissues, including the
brain and retina. CLN2 disease is characterized by seizures, rapid deterioration of language and motor functions, cognitive decline, loss of vision and
blindness, and premature death by mid-childhood. Onset of symptoms is generally between two to four years of age, with initial features of recurrent
seizures (epilepsy), language delay and difficulty coordinating movements (ataxia). CLN2 disease is estimated to occur in approximately 1 in 250,000
births worldwide. Based on global population, this equates to as many as 500 patients born each year worldwide.

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There is currently no cure for CLN2 disease. Current treatment options include palliative care or ERT. While ERT has been an improvement over
palliative care in slowing disease progression, it does not address the ocular manifestations of CLN2 and we believe frequent administration of ERT into
the CNS, reliance on limited and specialized infusion centers, the need for and complications associated with a permanently implanted device, and lack of a
treatment for the underlying genetic cause of CLN2 disease represent an area of significant unmet medical need.

RGX‑181 is our investigational AAV Therapeutic for the treatment of CLN2 disease. It is designed to use the NAV AAV9 vector to deliver the

human TPP1 gene to the CNS. Delivery of the gene that is deficient within cells in the CNS could provide a permanent source of secreted TPP1 enzyme,
allowing for long-term cross-correction of cells throughout the CNS. We continue to evaluate RGX-181 in preclinical studies and are working with
regulatory agencies on the advancement of our clinical program.

RGX-381 is our investigational AAV Therapeutic targeting the ocular manifestations of CLN2 disease. RGX-381 is designed to use the NAV AAV9
vector to deliver the TPP1 gene directly to the retina. We believe that one-time administration of RGX-381 could provide a durable source of TPP1 activity
in the retina, thereby potentially preventing visual decline. There is currently no available treatment for the ocular manifestations of CLN2 disease. We
continue to evaluate RGX-381 in preclinical studies and are working with regulatory agencies on the advancement of our clinical program.

We have received orphan drug product designation and rare pediatric disease designation from the FDA, as well as ATMP classification from the

EMA for RGX‑181 and RGX-381.

Collaborations, Licensing and Company Formation

Collaborations, licensing and company formation are a key part of our commitment to enable the ongoing development of gene therapy treatments.

AbbVie Eye Care Collaboration

In September 2021, REGENXBIO and AbbVie announced a global strategic partnership to develop and commercialize RGX-314, a potential one-

time gene therapy for the treatment of wet AMD, DR and other chronic retinal diseases.

Under the terms of our Collaboration and License Agreement with AbbVie (the AbbVie Collaboration and License Agreement), we received an
upfront payment of $370 million. Additionally, we will be eligible to receive up to $1.38 billion in additional development, regulatory and commercial
milestone payments.

Through December 31, 2022, we will be responsible for development expenses for certain ongoing trials of RGX-314 and will share additional

development expenses related to RGX-314 with AbbVie. Beginning on January 1, 2023, AbbVie will be responsible for the majority of all development
expenses.

In the United States, we will participate in commercialization of licensed products to the extent set forth in a commercialization plan to be
determined in accordance with the AbbVie Collaboration and License Agreement, and the parties will equally share net profits and net losses associated
with commercialization of the licensed products in the United States. Outside the United States, AbbVie will be responsible, at its sole cost, for the
commercialization of licensed products. We will also be eligible to receive tiered royalties on net sales by AbbVie of licensed products outside the United
States at percentages in the mid-teens to low twenties, subject to specified offsets and reductions.

We will lead the manufacturing of RGX-314 for clinical development and U.S. commercial supply, and AbbVie will lead manufacturing of RGX-

314 for commercial supply outside the United States. Manufacturing expenses will be allocated between the parties in accordance with the terms of the
AbbVie Collaboration and License Agreement and mutually agreed supply agreements.

NAV Technology Licensees

In addition to our internal product development efforts, we sublicense our NAV Vectors to other leading biotechnology and pharmaceutical
companies. As of December 31, 2021, our NAV Technology Licensees are currently applying our NAV Technology Platform to a number of AAV
Therapeutics over a broad range of therapeutic areas and disease indications. Over 60 clinical trials utilizing NAV Vectors have been registered in the
National Institutes of Health (NIH) clinical trials database since 2015, and one of two FDA-approved AAV Therapeutics in the United States uses a NAV
Vector (Novartis’ Zolgensma). As of December 31, 2021, over 2,000 patients have been treated by REGENXBIO and our NAV Technology Licensees
using NAV Vectors across the clinical trial, managed access and commercial settings. In 2021, Zolgensma exceeded $1.3 billion in annual sales.

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Our NAV Technology Licensees are shown below.

We have also taken an active role in the formation of several of our NAV Technology Licensees, including being a founding shareholder in
Dimension Therapeutics, Inc. (Dimension), Prevail Therapeutics Inc. (Prevail) and Corlieve Therapeutics SAS (Corlieve), all of which have been acquired
in strategic transactions since their formation.  We entered into a license agreement with each of these NAV Technology Licensees upon their formation, for
which we received equity in the NAV Technology Licensee in addition to other consideration. In November 2017, Ultragenyx Pharmaceutical Inc. acquired
Dimension for approximately $152 million in cash. In January 2021, Eli Lilly and Company acquired Prevail for up to approximately $1.04 billion. In July
2021, uniQure N.V. (uniQure) acquired Corlieve for up to approximately €250 million in cash and uniQure shares.

NAV Technology licenses have been an important component of our strategy since REGENXBIO’s formation, creating opportunity for the
development of additional therapies for patients and potential for additional value generation from the platform. Equity ownership in certain NAV
Technology Licensees has generated significant additional return for REGENXBIO shareholders, and we believe the acquisition of these NAV Technology
Licensees in strategic transactions by biopharmaceutical companies is an important validation of the NAV Technology Platform.

Zolgensma License

In March 2014, we entered into an agreement with AveXis, Inc. (AveXis, now Novartis Gene Therapies) for an exclusive, worldwide commercial

license, with rights to sublicense, to the NAV AAV9 vector for the treatment of spinal muscular atrophy (SMA). In 2018, we amended the license to include
additional intellectual property owned or in-licensed by us, including rights to the NAV Technology Platform beyond NAV AAV9, as well as additional
AAV vectors we may discover or license for a certain period of time, for the treatment of SMA. Under the license agreement, as amended, we were entitled
to receive over $270 million in fees, development and commercial milestones. In addition, we are entitled to receive mid-single to low double-digit
royalties on net sales for Zolgensma or any product developed for the treatment of SMA using the NAV AAV9 vector. For any product developed for the
treatment of SMA using a licensed vector other than NAV AAV9, we are entitled to receive a low double-digit royalty on net sales.

Novartis acquired AveXis for $8.7 billion in April 2018, and Zolgensma was subsequently approved by the FDA in May 2019. In December 2020,

we sold a portion of our royalty rights from the net sales of Zolgensma to entities managed by Healthcare Royalty Management, LLC (HCR) for a gross
purchase price of $200 million. As of December 31, 2021, Zolgensma is approved in 42 countries and over 1,800 patients have been treated.

Platform License Agreements and Other Licenses

Platform Licenses

We have exclusively licensed many of our rights in our NAV Technology Platform from the University of Pennsylvania (Penn) and

GlaxoSmithKline LLC (GSK), which together we refer to as our Platform Licenses. We currently use our NAV Technology Platform to develop treatments
in the areas of retinal, neuromuscular and neurodegenerative diseases. We also sublicense our NAV Technology Platform to third parties in order to develop
and bring to market AAV Therapeutics for a range of severe diseases with significant unmet medical needs outside of our core disease indications and
therapeutic areas. For further information regarding our commercial sublicenses, please see “Commercial Licenses to NAV Technology Licensees” located
elsewhere in this Annual Report on Form 10-K.

The Trustees of the University of Pennsylvania. In February 2009, we entered into an exclusive, worldwide license agreement with Penn for patent

and other intellectual property rights relating to a gene therapy technology platform based on AAVs discovered at Penn in the laboratory of James M.
Wilson, M.D., Ph.D. This license was amended in September 2014, April 2016, April 2019 and

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September 2020. In February 2009, we also entered into a sponsored research agreement with Penn (the 2009 SRA) under which we funded the nonclinical
research of Dr. Wilson relating to AAV gene therapy and obtained an option to acquire an exclusive worldwide license in certain intellectual property
created pursuant to such 2009 SRA. We entered into an additional sponsored research agreement (the 2013 SRA) with Penn in November 2013 which was
funded entirely by our NAV Technology Licensee, Dimension Therapeutics, Inc. (since acquired by Ultragenyx Pharmaceutical Inc.) (Dimension). In
December 2014, we entered into another SRA with Penn funding related nonclinical research of Dr. Wilson (the 2014 SRA).

Our license agreement with Penn, as amended, provides us with an exclusive, worldwide license under certain patents and patent applications in

order to make, have made, use, import, offer for sale and sell products covered by the claims of the licensed patents and patent applications as well as all
patentable inventions (to the extent they are or become available for license) that:

•

•

•

•

were discovered by Dr. Wilson or other Penn researchers working under his direct supervision at Penn; and

are related to the AAV technology platform discovered by Dr. Wilson at Penn prior to February 2009, pursuant to a sponsored research
agreement or subsequent amendment to a sponsored research agreement; or

are necessary or useful for the practice of Penn’s patent rights in the treatment of CLN2 disease, a form of Batten disease, and conceived and
reduced to practice since October 2015; and

are owned and controlled by Penn.

Prior to entering into the license agreement with us, Penn had previously entered into two license agreements with third parties with respect to

certain of the licensed patents and patent applications. Our license from Penn is subject to those preexisting license grants. With respect to the first third
party license granted by Penn, our license is non-exclusive with respect to the patents and patent applications licensed to the third party for so long as that
preexisting license grant remains in effect and will become exclusive upon the expiration or termination of that existing license agreement. The pre-existing
licenses also include a license agreement Penn entered into with GSK in May 2002 granting a license to certain patents and patent applications, of which
we subsequently sublicensed certain rights to from GSK in March 2009. For further information regarding our GSK sublicense, please see “Platform
License Agreements and Other Licenses—Platform Licenses—GlaxoSmithKline LLC” located elsewhere in this Annual Report on Form 10-K. Our license
agreement with Penn provides that should the rights Penn licensed to GSK ever revert to Penn, such rights shall automatically be included in our license
agreement with Penn.

The Penn license agreement, as amended, also provides us with certain additional rights, including a non-exclusive, worldwide license to use (i) all
data and information that was developed since October 2015 by Dr. Wilson, or other Penn researchers working under his direct supervision at Penn, that is
related to Batten disease, owned by Penn, and necessary or useful for the practice of the licensed patent rights in the treatment of CLN2 disease; and (ii) all
know-how that:

•

•

•

•

•

was developed by Dr. Wilson, or other Penn researchers working under his direct supervision at Penn; and

is related to the AAV technology platform discovered by Dr. Wilson prior to September 2014; or

is related to the AAV technology platform discovered by Dr. Wilson at Penn after September 2014 during the performance of a research
program we sponsored; and

is owned by Penn; and

is necessary or useful for the practice of the licensed patent rights.

Under the terms of the Penn license agreement, we issued equity to Penn and are also obligated to pay Penn:

•

•

•

•

•

•

up to $20.5 million upon the achievement of various development and sales-based milestones;

low- to mid-single digit royalties on net sales of licensed pharmaceutical products sold by us or our affiliates;

low-single digit to low-double digit royalty percentages of net sales on licensed products intended for research purposes only;

low- to mid-double digit royalty percentage on royalties received from third parties on net sales of licensed pharmaceutical products by such
third parties;

low-double digit to mid-teen digit percentages of sublicense fees we receive for the licensed intellectual property rights from sublicensees;
and

reimbursements for ongoing patent prosecution and maintenance expenses.

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Our Penn license agreement, as amended, will terminate with respect to licensed products in a field of use other than the treatment of familial

hypercholesterolemia (FH) on a product-by-product and country-by-country basis on the date each particular licensed product ceases to be covered by at
least one valid claim, issued or pending, under the licensed patent rights. We can terminate this license agreement by giving Penn prior written notice. Penn
has the right to terminate:

•

•

•

•

with notice if we are late in paying money due under the license agreement;

with notice if we fail to achieve a diligence event on or before the applicable completion date or otherwise breach the license agreement;

if we or our affiliates experience insolvency; or

if we commence any action against Penn to declare or render any claim of the licensed patent rights invalid or unenforceable.

Under the 2014 SRA, as amended, we funded research at Penn, paid certain intellectual property legal and filing expenses and received the rights to
certain research results. The Penn license agreement, as amended, and the 2014 SRA, as amended, provide that all patentable inventions conceived, created,
or conceived and reduced to practice pursuant to the 2014 SRA, together with patent rights represented by or issuing from the U.S. patents and patent
applications, including provisional patent applications, automatically become exclusively licensed to us and all research results become automatically
licensed to us as know-how. Under the 2009 SRA, as amended, in consideration for our funding of research at Penn, we received an option to acquire a
worldwide license on commercially reasonable terms to practice all patentable inventions conceived, created, or reduced to practice pursuant to the 2009
SRA, together with patent rights represented by or issuing from the U.S. patents and patent applications, including provisional patent applications.

GlaxoSmithKline LLC. In March 2009, we entered into a license agreement with GSK, which was amended in April 2009, in order to secure the
exclusive rights to patents and patent applications covering NAV Technology that GSK had previously licensed from Penn (subject to certain rights retained
by GSK and Penn). Under this GSK license agreement, we receive an exclusive, worldwide sublicense under the licensed patent rights to make, have made,
use, import, sell and offer for sale products covered by the licensed patent rights anywhere in the world. Our rights under this GSK license agreement are
subject to certain rights retained by GSK for the benefit of itself and other third parties, including rights relating to: domain antibodies; RNA interference
and antisense drugs; internal research purposes and GSK’s discovery research efforts with non-profit organizations and GSK collaborators; AAV8 for the
treatment of hemophilia B; AAV9 for the treatment of Muscular Dystrophy, congestive heart failure suffered by Muscular Dystrophy patients and
cardiovascular diseases by delivery of certain genes; and non-commercial research in the areas of Muscular Dystrophy, hemophilia B, congestive heart
failure suffered by Muscular Dystrophy patients, and other cardiovascular disease. Under the terms of the license agreement, we issued equity to GSK and
are obligated to pay GSK:

•

•

•

•

up to $1.5 million in aggregate milestone payments, all of which have been paid;

low- to mid-single digit royalty percentages on net sales of licensed products;

low- to mid-double digit percentages of any sublicense fees we receive from sublicensees for the licensed intellectual property rights; and

reimbursements for certain patent prosecution and maintenance expenses.

Under our GSK license agreement, we are required to use commercially reasonable efforts to develop and commercialize licensed products. Our

GSK license agreement will terminate upon the expiration, lapse, abandonment or invalidation of the last licensed claim to expire, lapse, become
abandoned or unenforceable in all the countries of the world where the licensed patent rights existed. However, if no patent ever issues from patent rights
licensed from GSK, this license agreement will terminate a specified number of years after the first commercial sale of the first licensed product in any
country. We may terminate this license agreement for any reason upon a specified number of days’ written notice. GSK can terminate this license
agreement if:

•

•

•

we are late in paying GSK any money due under the agreement and do not pay in full within a specified number of days of GSK’s written
demand;

we materially breach the agreement and fail to cure within a specified number of days; or

we file for bankruptcy.

Other Licenses

Regents of the University of Minnesota. In November 2014, we entered into a license agreement with Regents of the University of Minnesota

(Minnesota) for the exclusive rights to Minnesota’s undivided interest in intellectual property jointly owned by

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Minnesota and us relating to the delivery of AAV vectors to the CNS. This license was amended in November 2016 and September 2021. Under this
Minnesota license agreement, as amended, we receive an exclusive license under the licensed patent rights to make, have made, use, offer to sell or sell,
offer to lease or lease, import or otherwise offer to dispose or dispose of products covered by the licensed patent rights in all fields of use in any country or
territory in which a licensed patent has been issued and is unexpired or a licensed patent application is pending until November 2019, after which time the
field of use would be limited to all fields of use using our NAV Vectors in addition to certain additional indications and areas. Under the terms of the
agreement, we are obligated to pay Minnesota upfront fees, annual maintenance fees, royalties on net sales, if any, sublicense fees and fees upon the
achievement of various milestones.

Emory University. In August 2018, we entered into a license agreement with Emory University (Emory) for the exclusive rights to Emory’s
undivided interest in intellectual property jointly owned by Emory and us relating to the delivery of AAV vectors to the CNS. Under this Emory license
agreement, we receive an exclusive license under the licensed patent rights to make, have made, use, import, offer to sell or sell licensed products in all
fields of use in any country. Under the terms of the agreement, we are obligated to pay Emory an upfront fee, annual maintenance fees under certain
circumstances, royalties on net sales, sublicense fees, and fees upon the achievement of various milestones for the first licensed product.

Clearside Biomedical, Inc.  In August 2019, we entered into an option and license agreement with Clearside Biomedical, Inc. (Clearside) for the
option to receive an exclusive, worldwide commercial license, with rights to sublicense, to Clearside’s SCS Microinjector for the delivery of AAV gene
therapies for the treatment of wet AMD, DR, and other conditions for which chronic anti-VEGF treatment is currently the standard of care.  In October
2019, we exercised the option.  Under the terms of the agreement, we are obligated to pay Clearside an upfront fee, royalties on net sales, and fees upon the
achievement of various milestones.  As between us and Clearside, we will be responsible for all development, regulatory and commercialization activities
for our gene therapy product candidates.  Clearside will be responsible for supplying the SCS Microinjector in support of our preclinical studies, clinical
studies and commercial use.

Intellectual Property

Our patent portfolio includes patents and patent applications that we own, co-own and license from third parties and covers all aspects of our NAV

Technology Platform, clinical candidates and programs, formulations, devices, manufacturing and research programs. We believe this patent portfolio
enables us to support our development of AAV Therapeutics to address significant unmet medical needs.

NAV Technology Platform

As of December 31, 2021, our patent portfolio included 18 issued U.S. patents and six European patents relating to the AAV7, AAV8, AAV9 and

AAVrh10 vectors and their uses. These patents have terms that will expire as late as 2026, not including patent term extensions.

Our Investigational AAV Therapeutics

As of December 31, 2021, in addition to the patents related to our NAV Technology Platform described above, our patent portfolio included a total

of five issued U.S. patents, two issued European patents, five pending International Patent applications filed pursuant to the Patent Cooperation Treaty
(PCTs) and 22 PCTs that have entered national stage relating to our product candidates, which are described below:

Retinal Diseases

In addition to our NAV Technology Platform patents covering the NAV AAV8 vector and manufacture of NAV AAV8 vectors used in our retinal

disease programs, our patent portfolio includes more recent filings relating to our clinical candidate vectors, clinical protocols, routes of administration to
the eye (subretinal and suprachoroidal), formulations and target diseases treated by our gene therapy vectors.

•

RGX-314: Our patent portfolio supports our clinical development and our collaboration with AbbVie for the clinical development of RGX-
314. Our patent portfolio covers the use of RGX-314 for the treatment of wet AMD through subretinal or suprachoroidal administration and
for the treatment of DR through suprachoroidal administration; it also covers formulations and devices used for suprachoroidal
administration.

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Our patent portfolio relating to RGX-314 includes one issued U.S. patent that will expire in 2037, two pending PCTs and five PCTs that have
entered national stage for which any issued U.S. or European patent would expire in 2037, 2038, 2039 or 2040, in each case without taking
into account any possible patent term adjustment or extension.

•

RGX-381:  Our patent portfolio covers the use of RGX-381 for the treatment of ocular manifestations of CLN2 disease through subretinal or
suprachoroidal administration. Our patent portfolio relating to RGX-381 includes three PCTs that have entered national stage for which any
issued U.S. or European patent would expire in 2038, 2039 or 2040, in each case without taking into account any possible patent term
adjustment or extension.

Neuromuscular Diseases

In addition to our NAV Technology Platform patents covering the NAV AAV8 vector and its manufacture, our patent portfolio includes more recent
filings relating to RGX-202, the NAV AAV8 capsid carrying our microdystrophin construct used to treat Duchenne and the manufacture of RGX-202. Our
patent portfolio also covers other AAV vectors carrying our microdystrophin transgene, as well as intravenous and other modes of administration, and
formulations.

Our patent portfolio relating to RGX-202 includes one pending PCT for which any issued U.S. or European patent would expire in 2040, without

taking into account any possible patent term adjustment or extension.

Neurodegenerative Diseases

In addition to our NAV Technology Platform patents covering the NAV AAV9 vector and the manufacture of NAV AAV9 vectors used in our

neurodegenerative disease programs, our patent portfolio includes more recently filed patents, that cover our clinical candidate vectors, routes of
administration used in our neurodegenerative disease clinical-stage programs (intracisternal administration for intrathecal delivery, as well as lumbar
puncture and intraventricular administration), formulations and target diseases, including MPS II, MPS I and CLN2 disease.  

•

•

RGX-121/111:  Our patent portfolio relating to RGX-121 or RGX-111 includes one issued U.S. patent that will expire in 2037, three issued
U.S. patents that will expire in 2034, one issued European patent that will expire in 2034, one issued European patent that will expire in 2036,
12 PCTs that have entered national stage and two pending PCTs for which any issued U.S. or European patents would expire in 2034, 2036,
2037, 2038, 2039 or 2041, in each case without taking into account any possible patent term adjustment or extension.  

RGX-181:  Our patent portfolio relating to RGX-181 includes two PCTs that have entered national stage for which any issued U.S. or
European patent would expire in 2038 or 2039, in each case without taking into account any possible patent term adjustment or extension.

Manufacturing

Our patent portfolio covers aspects of our manufacturing processes which support our ability to perform large scale manufacturing, increase yield

and purity of AAV vector products and meet clinical supply requirements.  

Our patent portfolio also includes protection for novel validation and potency assays that further support and streamline our manufacturing

processes.

Customers

Our revenues for the years ended December 31, 2021, 2020 and 2019 consisted solely of license and royalty revenue. Two customers (AbbVie and

Novartis Gene Therapies) accounted for approximately 99% of our total revenues for the year ended December 31, 2021. One customer (Novartis Gene
Therapies) accounted for approximately 94% of our total revenues for the year ended December 31, 2020. Three customers (Novartis Gene Therapies and
two other customers) accounted for approximately 92% of our total revenues for the year ended December 31, 2019. We expect future license and royalty
revenue to continue to be derived from a limited number of licensees. Future license and royalty revenue is uncertain due to the contingent nature of our
licenses granted to third-parties and may fluctuate significantly from period to period.

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Competition

We are aware of a number of companies focused on developing gene therapies in various disease indications, including 4D Molecular Therapeutics,
Inc., Adverum Biotechnologies, Inc., Amicus Therapeutics, Inc., BioMarin Pharmaceutical, Inc., Homology Medicines, Inc., MeiraGTx Limited, Novartis
AG, Passage Bio, Inc., PTC Therapeutics, Inc., Roche, Sanofi, Sarepta Therapeutics, Inc., Solid Biosciences, Inc., Taysha Gene Therapies, Inc., Tenaya
Therapeutics, Inc. and uniQure N.V., as well as a number of companies addressing other methods for modifying genes and regulating gene expression.
Additionally, we have sublicensed our NAV Technology Platform for developing gene therapies in various disease indications to our NAV Technology
Licensees. Not only must we compete with other companies that are focused on gene therapy products using earlier generation AAV technology and other
gene therapy platforms, but any products that we may commercialize will have to compete with existing therapies and new therapies that may become
available in the future.

There are other organizations working to improve existing therapies or to develop new therapies for our initially selected disease indications.
Depending on how successful these efforts are, it is possible they may increase the barriers to adoption and success for our product candidates, if approved.
These efforts include the following:

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•

•

•

•

•

Wet AMD. Marketed competition for wet AMD largely consists of anti-VEGF therapies developed by Roche/Genentech, Inc. (Lucentis,
Susvimo, Vabysmo), Regeneron Pharmaceuticals, Inc. (Eylea) and Novartis (Beovu). Companies with products in development for the
treatment of wet AMD include, but may not be limited to, Adverum, Graybug Vision, Inc., Kodiak Sciences, Inc., Opthea and Outlook
Therapeutics, Inc..

DR. Currently marketed anti-VEGF competition for DR with DME include Roche/Genentech (Lucentis, Vabysmo) and Regeneron (Eylea).
Companies with products in development for the treatment of DR with DME include, but may not be limited to, Graybug Vision, Kodiak
Sciences, Novartis, Opthea and Roche. The principal marketed anti-VEGF competition for DR without DME is Roche/Genentech (Lucentis)
and Regeneron (Eylea). Companies with products in development for the treatment of DR without DME include, but may not be limited to,
Kodiak Sciences, Novartis and Roche.

DMD. There are currently two companies with marketed branded products to treat DMD. Sarepta products (Exondys, Vyondys) and PTC
Therapeutics’ products (Translarna, Emflaza) are only available in select geographies. There are three principal competitive gene therapy
products in clinical development from Pfizer, Inc (PF-06939926), Sarepta/Roche (SRP-9001) and Solid Biosciences (SGT-001). Other
companies with gene therapies in early development for DMD include, but may not limited to, Astellas Pharma Inc., Genethon and
Ultragenyx.

MPS II. The principal marketed competition for the treatment of MPS II is a systemic enzyme replacement therapy marketed by Takeda
Pharmaceutical Company, Ltd. and Sanofi (Elaprase). In 2021, a blood-brain barrier penetrating enzyme replacement therapy marketed by
JCR Pharmaceuticals Co., Ltd. (Izcargo) was approved in Japan for the treatment of systemic and neurological manifestations of MPS II.
Companies with products in development for the treatment of MPS II include, but may not be limited to, Avrobio, Inc., Denali Therapeutics
Inc., Homology Medicines, Sigilon Therapeutics, Inc. and Takeda.

MPS I. There is one principal competitor with a marketed product for the treatment of MPS I, Sanofi (Aldurazyme). Companies with
products in development for the treatment of MPS I include, but may not be limited to, JCR Pharmaceuticals Co., Ltd. and Orchard
Therapeutics plc.

CLN2 Disease. There is one principal competitor with a marketed product for the treatment of CLN2 disease, BioMarin (Brineura).
Companies with products in development for the treatment of CLN2 disease include, but may not be limited to, Lexeo Therapeutics, Orphion
Therapeutics and Roche.

Many of our competitors, either alone or with their strategic partners, have substantially greater financial, technical and human resources than we
do. Our competitors may be more successful than us in obtaining approval for treatments and achieving widespread market acceptance. Our competitors’
treatments may be more effective, or more effectively marketed and sold, than any treatment we may commercialize and may render our treatments
obsolete or non-competitive before we can recover the expenses of developing and commercializing any of our treatments.

Mergers and acquisitions in the biotechnology and pharmaceutical industries may result in even more resources being concentrated among a smaller

number of our competitors. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel and
establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our
programs. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and
established companies.

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We anticipate that we will face intense and increasing competition as new drugs and treatments enter the market and advanced technologies become

available. We expect any treatments that we develop and commercialize to compete on the basis of, among other things, efficacy, safety, convenience of
administration and delivery, price, the level of generic competition and the availability of reimbursement from government and other third-party payors.

Government Regulation

In the United States, biological products, including gene therapy products, are subject to regulation under the Federal Food, Drug, and Cosmetic Act

(FD&C Act), and the Public Health Service Act (PHS Act) and other federal, state, local and foreign statutes and regulations. Both the FD&C Act and the
PHS Act and their corresponding regulations govern, among other things, the testing, manufacturing, safety, efficacy, labeling, packaging, storage, record
keeping, distribution, reporting, advertising and other promotional practices involving biological products. Applications to the FDA are required before
conducting clinical testing of biological products, and each clinical study protocol for a gene therapy product is reviewed by the FDA.

Within the FDA, the Center for Biologics Evaluation and Research (CBER) regulates gene therapy products. The FDA has published guidance
documents related to, among other things, gene therapy products in general, their preclinical assessment, observing subjects involved in gene therapy
studies for delayed adverse events, potency testing, and chemistry, manufacturing and control information in gene therapy INDs.

Ethical, scientific, 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. Biological Products Development Process

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

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•

•

•

•

•

completion of nonclinical laboratory tests, including evaluations of product chemistry, formulations, toxicity in animal studies in accordance
with good laboratory practice (GLP) and applicable requirements for the humane use of laboratory animals or other applicable regulations;

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

performance of adequate and well-controlled human clinical studies according to the FDA’s requirements for good clinical practice (GCP)
and additional requirements for the protection of human research subjects and their health information, to establish the safety and efficacy of
the proposed biological product for its intended use;

submission to the FDA of a BLA for marketing approval that includes substantive evidence of safety, purity, and potency from results of
nonclinical testing and clinical studies, as well as information on the chemistry, manufacturing and controls to ensure product identity and
quality, and proposed labeling;

satisfactory completion of an FDA inspection of the manufacturing facility or facilities where the biological product is produced to assess
compliance with cGMP, to assure that the facilities, methods and controls are adequate to preserve the biological product’s identity, strength,
quality and purity and, if applicable, the FDA’s current good tissue practice (GTP), for the use of human cellular and tissue products;

potential FDA inspection of the nonclinical and clinical study sites and the clinical study sponsor that generated the data in support of the
BLA; and

FDA review and approval, or licensure, of the BLA.

The clinical study 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 the IND. Some preclinical testing may continue even after the IND is
submitted. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA places the clinical study on a clinical hold within
that 30-day time period. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical study can begin. The FDA
may also impose clinical holds on a biological product

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candidate at any time before or during clinical studies due to safety concerns or non-compliance. If the FDA imposes a clinical hold, studies 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 will
result in the FDA allowing clinical studies to begin, or that, once begun, issues will not arise that suspend or terminate such studies.

Clinical studies involve the administration of the biological product candidate to healthy volunteers or patients under the supervision of qualified

investigators, generally physicians not employed by or under the study sponsor’s control. Clinical studies are conducted under protocols detailing, among
other things, the objectives of the clinical study, dosing procedures, subject selection and exclusion criteria, and the parameters to be used to monitor
subject safety, including stopping rules that assure a clinical study 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. Clinical studies must be conducted and monitored in accordance with the
FDA’s regulations imposing the GCP requirements, including the requirement that all research subjects provide informed consent. Further, each clinical
study must be reviewed and approved by an independent institutional review board (IRB) at or servicing each institution at which the clinical study will be
conducted. An IRB is charged with protecting the welfare and rights of study participants and considers such items as whether the risks to individuals
participating in the clinical studies 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 study subject or his or her legal representative and must monitor the clinical study until completed.
Clinical studies generally also must be reviewed by an institutional biosafety committee (IBC), a local institutional committee that reviews and oversees
basic and clinical research conducted at that institution. The IBC assesses the safety of the research and identifies any potential risk to public health or the
environment. Some studies also employ a Data and Safety Monitoring Board (DSMB), which operates with independence from the study sponsor and has
access to unblinded study data during the course of the study and may halt a study for ethical reasons such as undue safety risks.

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

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•

•

Phase I. The biological product is initially introduced into healthy human subjects and tested for safety. However, in the case of some
products for rare, severe or life-threatening diseases, the initial human testing is often conducted in patients.

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

Phase III. Clinical studies are undertaken to further evaluate dosage, clinical efficacy, potency, and safety in an expanded patient population at
geographically dispersed clinical study sites. These clinical studies are intended to establish the overall risk/benefit ratio of the product and
provide an adequate basis for product approval and labeling. Post-approval clinical studies, sometimes referred to as Phase IV clinical studies,
may be conducted after initial marketing approval. These clinical studies are used to gain additional experience from the treatment of patients
in the intended therapeutic indication, particularly for long-term safety follow-up. In some cases, Phase IV studies may be required by the
FDA as a condition of approval. The FDA recommends that sponsors observe subjects for potential gene therapy-related delayed adverse
events for as long as 15 years.

During all phases of clinical development, regulatory agencies require extensive monitoring and auditing of all clinical activities, clinical data, and
clinical study investigators. Annual progress reports detailing the results of the clinical studies must be submitted to the FDA. Written IND safety reports
must be promptly submitted to the FDA and the investigators for serious and unexpected adverse events, any findings from other studies, tests in laboratory
animals or in vitro testing that suggest a significant risk for human subjects, or any clinically important increase in the rate of a serious suspected adverse
reaction over that listed in the protocol or investigator brochure. The sponsor must submit an IND safety report within 15 calendar days after the sponsor
determines that the information qualifies for expedited reporting. The sponsor also must notify the FDA of any unexpected fatal or life-threatening
suspected adverse reaction within seven calendar days after the sponsor’s initial receipt of the information. Phase I, Phase II and Phase III clinical studies
may not be completed successfully within any specified period, if at all. The FDA or the sponsor or its DSMB may suspend a clinical study at any time on
various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend
or terminate approval of a clinical study at its institution if the clinical study is not being conducted in accordance with the IRB’s requirements or if the
biological product has been associated with unexpected serious harm to patients.

Human gene therapy products are a new category of therapeutics. Because this is a relatively new and expanding area of novel therapeutic
interventions, there can be no assurance as to the length of the study period, the number of patients the FDA will require to be enrolled in the studies in
order to establish the safety, efficacy, purity and potency of human gene therapy products, our ability to recruit sufficient numbers of study subjects for any
trial, or that the data generated in these studies will be acceptable to the FDA to support marketing approval.

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Concurrent with clinical studies, companies usually complete additional animal studies and must also develop additional information about the

physical characteristics of the biological product as well as finalize a process for manufacturing the product in commercial quantities in accordance with
cGMP requirements. To help reduce the risk of the introduction of adventitious agents with use of biological products, the PHS Act emphasizes the
importance of manufacturing control for products whose attributes cannot be precisely defined. The manufacturing process must be capable of consistently
producing quality batches of the product candidate and, among other things, the sponsor must develop methods for testing the identity, strength, quality,
potency 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.

U.S. Review and Approval Processes

After the completion of clinical studies of a biological product, FDA approval of a BLA must be obtained before commercial marketing of the

biological product. The BLA must include results of product development, laboratory and animal studies, human studies, information on the manufacture
and composition of the product, proposed labeling and other relevant information. Under the Prescription Drug User Fee Act (PDUFA), the BLA must be
accompanied by a substantial user fee payment unless an exception or waiver applies. In addition, under the Pediatric Research Equity Act (PREA), a BLA
or supplement to a BLA must contain data to assess the safety and effectiveness of the biological product for the claimed indications in all relevant
pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDA
may grant deferrals for submission of pediatric data or full or partial waivers of pediatric requirements. Unless otherwise required by regulation, PREA
does not apply to any biological product for an indication for which orphan designation has been granted. The testing and approval processes require
substantial time and effort and there can be no assurance that the FDA will accept the BLA for filing and, even if filed, that any approval will be granted on
a timely basis, if at all.

Within 60 days following submission of the application, the FDA reviews a BLA submitted to determine if it is substantially complete before the
agency 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 this 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 is safe and potent, including whether it is effective, for its intended
use, and has an acceptable purity profile, and whether the product is being manufactured in accordance with cGMP to assure and preserve the product’s
identity, strength, quality, potency and purity as those factors relate to the safety or effectiveness of the product. The FDA may refer applications for novel
biological products or biological 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
biological product approval process, the FDA also will determine whether a Risk Evaluation and Mitigation Strategy (REMS) is necessary to assure the
safe use of the biological product upon marketing. 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 is manufactured. The FDA will not approve the product unless it
determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production of the
product within required specifications. For a gene therapy product, the FDA also will not approve the product if the manufacturer is not in compliance with
GTP. These are FDA regulations that govern the methods used in, and the facilities and controls used for, the manufacture of human cells, tissues, and
cellular and tissue based products (HCT/Ps) which are human cells or tissue intended for implantation, transplant, infusion, or transfer into a human
recipient. The primary intent of the GTP requirements is to ensure that cell and tissue based products are manufactured in a manner designed to prevent the
introduction, transmission and spread of communicable disease. FDA regulations also require tissue establishments to register and list their HCT/Ps with
the FDA and, when applicable, to evaluate donors through screening and testing. Additionally, before approving a BLA, the FDA will typically inspect one
or more clinical sites to assure that the clinical studies were conducted in compliance with IND study requirements and GCP requirements. To assure
cGMP, GTP and GCP compliance, an applicant must incur significant expenditure of time, money and effort in the areas of training, record keeping,
production, and quality control.

Notwithstanding the submission of relevant data and information, the FDA may ultimately decide that the BLA does not satisfy its regulatory
criteria for approval and deny approval. Data obtained from clinical studies are not always conclusive and the FDA may interpret data differently than we
interpret the same data. If the agency decides not to approve the BLA in its present form, the FDA will issue a complete response letter that usually
describes all of the specific deficiencies in the BLA identified by the FDA. The deficiencies identified may be minor, for example, requiring labeling
changes, or major, for example, requiring additional clinical studies. Additionally, the complete response letter may include recommended actions that the
applicant might take to place the application in a condition for approval. If a complete response letter is issued, the applicant may either resubmit the BLA,
addressing all of the deficiencies identified in the letter, or withdraw the application.

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If a product receives regulatory approval, the approval may be significantly limited to specific diseases and dosages or the indications for use may
otherwise be limited, which could restrict the commercial value of the product. 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 studies designed to further assess a
biological product’s safety and effectiveness, and testing and surveillance programs to monitor the safety of approved products that have been
commercialized.

One of the performance goals agreed to by the FDA under PDUFA is to review 90% of standard BLAs in 10 months of the 60-day filing date and

90% of priority BLAs in six months of the 60-day filing date, whereupon a review decision is to be made. Two months are added to these time periods for
new molecular entities. 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, constituting a major amendment to the BLA.

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biological product intended to treat a rare disease or condition,

which is defined under the FD&C Act as a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000
individuals in the United States and for which there is no reasonable expectation that the cost of developing and making a drug or biological product
available in the United States for this type of disease or condition will be recovered from sales of the product. Orphan product designation must be
requested before submitting a BLA. After the FDA grants orphan product designation, the identity of the therapeutic agent and its potential orphan use are
disclosed publicly by the FDA. Orphan product designation does not convey any advantage in or shorten the duration of the regulatory review and approval
process.

If a product that has orphan designation subsequently receives the first FDA approval for that product for the disease or condition for which it has

such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications to market the
same drug or biological 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. Competitors, however, may receive approval of different products for the 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. Orphan product exclusivity
also could block the approval of one of our products for seven years if a competitor obtains approval of the same biological product as defined by the FDA
or if our product candidate is determined to be contained within the competitor’s product for the same indication or disease. If a drug or biological product
designated as an orphan product receives marketing approval for an indication broader than what is designated, it may not be entitled to orphan product
exclusivity. Orphan drug status in the European Union (EU) has similar, but not identical, benefits.

Orphan drug products are also eligible for Rare Pediatric Disease Designation if greater than 50% of patients living with the disease are under age

18. A priority review voucher will be given to the sponsor of a product with a Rare Pediatric Disease Designation at the time of product approval that is
transferable to another company.

Expedited Development and Review Programs

The FDA has a Fast Track program that is intended to expedite or facilitate the process for reviewing new drugs and biological products, including
precision drugs or biological products, that meet certain criteria. Specifically, new drugs and biological products are eligible for Fast Track designation if
they are intended to treat a serious or life-threatening condition and demonstrate the potential to address unmet medical needs for the condition. Fast Track
designation applies to the combination of the product and the specific indication for which it is being studied. The sponsor of a new drug or biologic may
request the FDA to designate the drug or biologic as a Fast Track product at any time during the clinical development of the product. Also under the Fast
Track program, the FDA may consider for review sections of the marketing application on a rolling basis before the complete application is submitted, if
the sponsor provides a schedule for the submission of the sections of the application, the FDA agrees to accept sections of the application and determines
that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the application.

Any product submitted to the FDA for marketing, including under a Fast Track program, may be eligible for other types of FDA programs intended

to expedite development and review, such as Breakthrough Therapy designation, priority review, and accelerated approval. Under the Breakthrough
Therapy program, products intended to treat a serious or life-threatening disease or condition may be eligible for additional benefits when preliminary
clinical evidence demonstrates that such product may have substantial improvement on one or more clinically significant endpoints over existing therapies.
The FDA will seek to ensure the sponsor of a breakthrough therapy product receives timely advice and interactive communications to help the sponsor
design and conduct a

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development program as efficiently as possible. In addition, gene therapies, including genetically modified cells, that lead to a durable modification of cells
or tissues, may be eligible for regenerative medicine advanced therapy (RMAT) designation. Products with an RMAT designation are eligible for the
benefits of Breakthrough Therapy in addition to allowing the sponsor the ability to participate in meetings with the FDA to discuss whether accelerated
approval would be appropriate based on surrogate or intermediate endpoints reasonably likely to predict long-term clinical benefit. Any product is eligible
for priority review if it has the potential to provide safe and effective therapy where no satisfactory alternative therapy exists or a significant improvement
in the treatment, diagnosis or prevention of a serious or life-threatening disease or condition compared to marketed products. Specific priority review
programs exist for material threat medical countermeasures, rare pediatric diseases and tropical diseases. The FDA will attempt to direct additional
resources to the evaluation of an application for a new drug or biological product designated for priority review in an effort to facilitate the review, in
accordance with FDA guidance. Additionally, a product may be eligible for accelerated approval. Drug or biological products studied for their safety and
effectiveness in treating serious or life-threatening illnesses and that provide meaningful therapeutic benefit over existing treatments may receive
accelerated approval, which means that they may be approved on the basis of adequate and well-controlled clinical studies establishing that the product has
an effect on a surrogate endpoint that is reasonably likely to predict a clinical benefit, or on the basis of an effect on a clinical endpoint other than survival
or irreversible morbidity. As a condition of approval, the FDA will require that a sponsor of a drug or biological product receiving accelerated approval
perform adequate and well-controlled post-marketing clinical studies to confirm the clinical benefit of the medicine. In addition, the FDA currently requires
as a condition for accelerated approval pre-submission of promotional materials, which could adversely impact the timing of the commercial launch of the
product. Fast Track designation, Breakthrough Therapy or RMAT designation, priority review and accelerated approval do not change the standards for
approval. Rather, these programs are intended to expedite the development and approval process, but do not necessarily accomplish that intent.

Post-Approval Requirements

Maintaining substantial compliance with applicable federal, state, and local statutes and regulations requires the expenditure of substantial time and

financial resources. Rigorous and extensive FDA regulation of biological products continues after approval, particularly with respect to cGMP. We will
rely, and expect to continue to rely, on third parties for the production of clinical and commercial quantities of any products that we may commercialize.
Manufacturers of our products 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 biological products, include reporting of cGMP
deviations that may affect the identity, strength, quality, potency, or purity of a distributed product in a manner that may impact the safety or effectiveness
of the product, record-keeping 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. As part of the manufacturing process,
the manufacturer is required to perform certain tests on each lot of the product before it is released for distribution. 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 of the manufacturer’s tests performed on the lot. The FDA also may perform certain confirmatory tests on
lots of some products, such as viral vaccines, before releasing the lots for distribution by the manufacturer. In addition, the FDA conducts laboratory
research related to the regulatory standards on the safety, purity, potency, and effectiveness of biological products.

We also must comply with the FDA’s advertising and promotion and related medical communication requirements, such as those related to direct-to-

consumer advertising, 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 use”), the requirement to balance promotion information on efficacy with important safety information and limitations on use,
industry-sponsored scientific and educational activities, and promotional activities involving the internet. 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. Failure to comply with the applicable U.S. requirements at any time during the product
development process, approval process or after approval, may subject an applicant or manufacturer to administrative or judicial civil or criminal sanctions
and adverse publicity. FDA sanctions could include refusal to approve pending applications, withdrawal of an approval, clinical hold, warning or untitled
letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts,
mandated corrective advertising or communications with doctors, debarment, restitution, disgorgement of profits, or civil or criminal penalties. Any agency
or judicial enforcement action could have a material adverse effect on us.

Biological product manufacturers and other entities involved in the manufacture and distribution of approved biological products are required to
register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and certain state
agencies for compliance with cGMP and other laws. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production
and quality control to maintain cGMP compliance. Discovery of problems with a product after approval may result in restrictions on a product,
manufacturer, or holder of an approved BLA, including

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withdrawal of the product from the market. 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 or conditions of approval, such as adding new indications and additional labeling claims,
are also subject to further FDA review and approval.

U.S. Patent Term Restoration and Marketing Exclusivity

Depending upon the timing, duration and specifics of the FDA approval of the use of our product candidates, some of our U.S. patents may be
eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly referred to as the Hatch-
Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during
product development and the FDA regulatory review process. However, patent term restoration cannot extend the remaining term of a patent beyond a total
of 14 years from the product’s approval date. The patent term restoration period is generally one-half the time between the effective date of an IND and the
submission date of a BLA plus the time between the submission date of a BLA and the approval of that application. Only one patent applicable to an
approved biological product is eligible for the extension and the application for the extension must be submitted prior to the expiration of the patent. The
U.S. Patent and Trademark Office, in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In the
future, we may apply for restoration of patent term for one of our currently owned or licensed patents to add patent life beyond its current expiration date,
depending on the expected length of the clinical studies and other factors involved in the filing of the relevant BLA.

A biological product can obtain pediatric market exclusivity in the United States. Pediatric exclusivity, if granted in the case of a biologic approved
under a BLA, adds six months to existing exclusivity periods. This six-month exclusivity, which runs from the end of other exclusivity protection, may be
granted based on the voluntary completion of a pediatric study in accordance with an FDA-issued “Written Request” for such a study.

The Patient Protection and Affordable Care Act (PPACA) signed into law on March 23, 2010, includes a subtitle called the Biologics Price

Competition and Innovation Act of 2009, which created an abbreviated approval pathway for biological products shown to be similar to, or interchangeable
with, an FDA-licensed reference biological product. This amendment to the PHS Act attempts to minimize duplicative testing. Biosimilarity, which
requires that there be no clinically meaningful differences between the biological product and the reference product in terms of safety, purity, and potency,
can be shown through analytical studies, animal studies, and a clinical study or studies. Interchangeability requires that a product is biosimilar to the
reference product and the product must demonstrate that it can be expected to produce the same clinical results as the reference product and, for products
administered multiple times, the biologic and the reference biologic may be switched after one has been previously administered without increasing safety
risks or risks of diminished efficacy relative to exclusive use of the reference biologic. However, complexities associated with the larger, and often more
complex, structure of biological products, as well as the process by which such products are manufactured, pose significant hurdles to interchangeability
approval.

A reference biologic is granted 12 years of exclusivity from the time of first licensure of the reference product. The first biologic product submitted

under the abbreviated approval pathway that is determined to be interchangeable with the reference product has exclusivity against other biologics
submitting under the abbreviated approval pathway for the lesser of (i) one year after the first commercial marketing, (ii) 18 months after approval if there
is no legal challenge, (iii) 18 months after the resolution in the applicant’s favor of a lawsuit challenging the biologics’ patents if an application has been
submitted, or (iv) 42 months after the application has been approved if a lawsuit is ongoing within the 42-month period.

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 Conservancy and Recovery Act and the Toxic Substances Control Act, affect our business. These and other laws govern our
use, handling and disposal of various biological, chemical and radioactive substances used in, and wastes generated by, our 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. We
believe that we are in material compliance with applicable environmental laws and that continued compliance therewith will not have a material adverse
effect on our business. We cannot predict, however, how changes in these laws may affect our future operations. Equivalent laws have been adopted in
other countries that impose similar obligations.

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Other U.S. 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 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:

•

•

•

•

•

•

•

the federal Anti-Kickback Statute, which prohibits, among other things, persons 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, patients, purchasers and formulary managers on the other. PPACA amends 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;

the federal False Claims Act (FCA), which prohibits, among other things, individuals or entities from knowingly presenting, or causing to be
presented, claims for payment from Medicare, Medicaid or other federal healthcare programs that are false or fraudulent. Federal Anti-
Kickback Statute violations and certain marketing practices, including off-label promotion, also may implicate the FCA:

federal criminal laws that prohibit executing a scheme to defraud any healthcare benefit program or making false statements relating to
healthcare matters;

the federal Physician Payment Sunshine Act, which requires certain manufacturers of drugs, devices, biologics and medical supplies to report
annually to the Centers for Medicare & Medicaid Services (CMS) information related to payments and other transfers of value to physicians
and teaching hospitals, and ownership and investment interests held by physicians and their immediate family members;

the Health Insurance Portability and Accountability Act of 1996 (HIPAA) imposes criminal and civil liability for executing a scheme to
defraud any healthcare benefit program or making false statements relating to healthcare matters;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, which governs the conduct of certain
electronic healthcare transactions and protects the security and privacy of protected health information; 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 these
state and foreign laws differ from federal law and from each other in significant ways and may not have the same effect, thus complicating
compliance efforts.

Violation of any 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 and
imprisonment. Furthermore, efforts to ensure that business activities and business arrangements comply with applicable healthcare laws and regulations can
be costly for manufacturers of branded prescription products.

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 and markets in other countries, sales of any product candidates for which regulatory approval for commercial sale is obtained will depend in
part on the availability of coverage and reimbursement from third-party payors. Third-party payors include government authorities, managed care
providers, private health insurers and other organizations. 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. Moreover, a payor’s decision
to provide coverage for a drug product does not imply that an adequate reimbursement rate will be approved.

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Third-party payors are increasingly challenging the price and examining the medical necessity and cost-effectiveness of medical products and
services, in addition to their safety and efficacy. New metrics frequently are used as the basis for reimbursement rates, such as average sales price, average
manufacturer price and actual acquisition cost. In order to obtain coverage and reimbursement for any product that might be approved for sale, it may be
necessary to conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost-effectiveness of the products, in addition
to the costs required to obtain regulatory approvals. If third-party payors do not consider a product to be cost-effective compared to other available
therapies, they may not cover the product after approval as a benefit under their plans or, if they do, the level of payment may not be sufficient to allow a
company to sell its products at a profit. Health Technology Assessment which is intended to take account of medical, social, economic and ethical issues
when determining the suitability of a medicinal product for reimbursement has increasingly become an element of the pricing and reimbursement decisions
of the competent authorities in EU Member States.

The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost containment programs to

limit the growth of government-paid health care costs, including price controls, restrictions on reimbursement and requirements for substitution of generic
products for branded prescription drugs. By way of example, PPACA contains provisions that may reduce the profitability of drug products, including, for
example, increasing the minimum rebates owed by manufacturers under the Medicaid Drug Rebate Program, extending the rebate program to individuals
enrolled in Medicaid managed care plans, addressing a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate
Program are calculated for drugs that are inhaled, infused, instilled, implanted or injected and establishing annual fees based on pharmaceutical companies’
share of sales to federal health care programs. Adoption of government controls and measures, and tightening of restrictive policies in jurisdictions with
existing controls and measures, could limit payments for pharmaceuticals.

U.S. Foreign Corrupt Practices Act

The U.S. Foreign Corrupt Practices Act (FCPA), to which we are subject, prohibits corporations and individuals from engaging in bribery and
corruption when dealing with foreign government officials. It is illegal to pay, offer to pay, promise or authorize the payment of money or anything of
value, directly or indirectly, to any foreign government official, political party or political candidate in an attempt to secure an improper advantage in order
to obtain or retain business or to otherwise improperly influence a foreign official in his or her official capacity. Comparable laws have been adopted in
other countries that impose similar obligations. We are also subject to the FCPA’s accounting provisions, which require us to keep accurate books and
records and to maintain a system of internal accounting controls sufficient to assure management’s control, authority, and responsibility over our assets.
The failure to comply with the FCPA and similar laws could result in civil or criminal sanctions or other adverse consequences.  

Government Regulation Outside of the United States

In addition to regulations in the United States, we will be subject to a variety of regulations in other jurisdictions governing, among other things,

clinical studies and any commercial sales and distribution of our products. Because biologically sourced raw materials are subject to unique contamination
risks, their use may be restricted in some countries.

Whether or not we obtain FDA approval for a product, we must obtain the requisite approvals from regulatory authorities in foreign countries prior
to the commencement of clinical studies or marketing of the product in those countries. Many countries outside of the United States have a similar process
that requires the submission of a clinical study application much like the IND prior to the commencement of human clinical studies. In the EU, for
example, clinical trials are governed by the new EU Regulation on Clinical Trials (Reg. EU No. 536/2014), or CTR, which became applicable in January
2022 and stipulates the process of obtaining competent authority approval for clinical trials in the EU. Under the CTR, trial sponsors submit their
application for approval via an EU Portal. The approvals will still need to be granted by the competent authorities of the EU Member States where a trial
takes place; however, the procedure for approval will be conducted in a coordinated manner among the concerned EU Member States as provided under the
CTR. While the process for the application and granting of the approvals was streamlined, it remains a complex process that can significantly delay the
start of a multinational clinical trial.

To obtain regulatory approval of a biological medicinal product under EU regulatory systems, we must submit a marketing authorization

application. The grant of marketing authorization in the EU for products containing viable human tissues or cells such as gene therapy medicinal products
is governed by Regulation 1394/2007/EC on advanced therapy medicinal products, read in combination with Directive 2001/83/EC of the European
Parliament and of the Council, commonly known as the Community code on medicinal products and Regulation (EC) No 726/2004 of the European
Parliament and of the Council of 31 March 2004 laying down Community procedures for the authorization and supervision of medicinal products for
human and veterinary use and establishing the European Medicines Agency (the EMA), commonly referred to as the EMA Regulation. Regulation
1394/2007/EC lays down specific rules concerning the authorization, supervision and pharmacovigilance of gene therapy medicinal products, somatic cell
therapy medicinal products and tissue engineered products. The EMA’s Committee for Advanced Therapies (CAT) is responsible for assessing the quality,
safety and efficacy of advanced therapy medicinal products (ATMP). ATMP include gene therapy medicinal

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products, somatic cell therapy medicinal products and tissue engineered products. The role of the CAT is to prepare a draft opinion on an application for
marketing authorization for an ATMP candidate that is submitted to the EMA. The EMA then provides a final opinion regarding the application for
marketing authorization. The European Commission grants or refuses marketing authorization after the EMA has delivered its opinion.

Innovative medicinal products are authorized in the EU on the basis of a full marketing authorization application (as opposed to an application for

marketing authorization that relies, in whole or in part, on data in the marketing authorization dossier for another, previously approved medicinal product).
Applications for marketing authorization for innovative medicinal products must contain the results of pharmaceutical tests, preclinical tests and clinical
trials conducted with the medicinal product for which marketing authorization is sought. Innovative medicinal products for which marketing authorization
is granted are entitled to eight years of data exclusivity. During this period, applicants for approval of generics or biosimilars of these innovative products
cannot rely on data contained in the marketing authorization dossier submitted for the innovative medicinal product to support their application. Innovative
medicinal products for which marketing authorization is granted are also entitled to ten years of market exclusivity. During these ten years of market
exclusivity, no generic or biosimilar medicinal product may be placed on the EU market even if a marketing authorization application for approval of a
generic or biosimilar of the innovative product has been submitted to the EMA or to the competent regulatory authorities in the EU Member States and
marketing authorization has been granted. The ten years of market exclusivity will be extended to a maximum of eleven years if, during the first eight years
of those ten years, the marketing authorization holder obtains an authorization for one or more new therapeutic indications which, during the scientific
evaluation prior to their authorization, are held to bring a significant clinical benefit in comparison with existing therapies. However, there is no guarantee
that a product will be considered by the EU’s regulatory authorities to be an innovative medicinal product which is eligible for the relevant periods of data
and market exclusivity.

Products authorized as “orphan medicinal products” in the EU are entitled to benefits additional to those granted in relation to innovative medicinal

products. In accordance with Article 3 of Regulation (EC) No. 141/2000 of the European Parliament and of the Council of 16 December 1999 on orphan
medicinal products, a medicinal product may be designated as an orphan medicinal product if (1) it is intended for the diagnosis, prevention or treatment of
a life-threatening or chronically debilitating condition; (2) either (a) such condition affects no more than five in 10,000 persons in the EU when the
application is made, or (b) the product, without the incentives derived from orphan medicinal product status, would not generate sufficient return in the EU
to justify investment; and (3) there exists no satisfactory method of diagnosis, prevention or treatment of such condition authorized for marketing in the
EU, or if such a method exists, the product will be of significant benefit to those affected by the condition. Further guidance on such criteria is provided in
European Commission Regulation (EC) No. 847/2000 of 27 April 2000 laying down the provisions for implementation of the criteria for designation of a
medicinal product as an orphan medicinal product and definitions of the concepts “similar medicinal product” and “clinical superiority”. Orphan medicinal
products are eligible for financial incentives such as reduction of fees or fee waivers and following grant of a marketing authorization, the EMA and the EU
Member States’ competent authorities are not permitted to accept another application for a marketing authorization, or grant a marketing authorization or
accept an application to extend an existing marketing authorization, for the same therapeutic indication of a similar medicinal product for ten years
following grant or authorization. The application for orphan drug designation must be submitted before the application for marketing authorization. The
applicant may receive a fee reduction for the marketing authorization application if the orphan drug designation has been granted, but not if the designation
is still pending at the time the marketing authorization is submitted. Orphan drug designation does not convey any advantage in, or shorten the duration of,
the regulatory review and approval process.

The 10-year market exclusivity that an orphan drug enjoys 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 orphan designation, for example, if the product is sufficiently profitable not to justify maintenance of market
exclusivity. Additionally, marketing authorization may be granted to a similar product during the 10-year period of market exclusivity for the same
therapeutic indication at any time if:

•

•

•

The second applicant can establish in its application that its product, although similar to the orphan medicinal product already authorized, is
safer, more effective or otherwise clinically superior;

The holder of the marketing authorization for the original orphan medicinal product consents to a second orphan medicinal product
application; or

The holder of the marketing authorization for the original orphan medicinal product cannot supply enough orphan medicinal product.

Similar to obligations imposed in the United States, medicinal products authorized in the EU may be subject to post-authorization obligations,

including the obligation to conduct Post Marketing Safety Studies (PASS) or Post Marketing Efficacy Studies (PAES).

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Reimbursement for medicinal products is still an area that is not harmonized in the EU and is largely governed by EU Member States’ laws.

However, there are some EU level legal frameworks that must be taken into account, including Council Directive 89/105/EEC (the Price Transparency
Directive). The aim of the Price Transparency Directive is to ensure that pricing and reimbursement mechanisms established in EU Member States are
transparent and objective, do not hinder the free movement and trade of medicinal products in the EU and do not hinder, prevent or distort competition on
the market. The Price Transparency Directive does not, however, provide any guidance concerning the specific criteria on the basis of which pricing and
reimbursement decisions are to be made in individual EU Member States. Neither does it have any direct consequence for pricing or levels of
reimbursement in individual EU Member States. The national authorities of the individual EU Member States are free to restrict the range of medicinal
products for which their national health insurance systems provide reimbursement and to control the prices and/or reimbursement of medicinal products for
human use. Individual EU Member States adopt policies according to which a specific price or level of reimbursement is approved for the medicinal
product. Other EU Member States adopt a system of reference pricing, basing the price or reimbursement level in their territory either, on the pricing and
reimbursement levels in other countries, or on the pricing and reimbursement levels of medicinal products intended for the same therapeutic indication.
Furthermore, some EU Member States impose direct or indirect controls on the profitability of the company placing the medicinal product on the market.

In 2011, Directive 2011/24/EU was adopted at the EU level. This Directive concerns the application of patients’ rights in cross-border healthcare.

The Directive is intended to establish rules for facilitating access to safe and high-quality cross-border healthcare in the EU.

Health Technology Assessment (HTA) of medicinal products is becoming an increasingly common part of the pricing and reimbursement procedures in

some EU Member States. HTA is the procedure according to which the assessment of the public health impact, therapeutic impact and the economic and societal
impact of the use of a given medicinal product in the national healthcare systems of the individual country is conducted. HTA generally focuses on the clinical
efficacy and effectiveness, safety, cost, and cost-effectiveness of individual medicinal products as well as their potential implications for the national healthcare
system. Those elements of medicinal products are compared with other treatment options available on the market.

The outcome of HTA may influence the pricing and reimbursement status for specific medicinal products within individual EU member states. The

extent to which pricing and reimbursement decisions are influenced by the HTA of a specific medicinal product vary between the EU Member States.

A new Regulation on HTA on EU level was adopted in December 2021: Regulation (EU) 2021/2282 of the European Parliament and of the Council

of 15 December 2021 on health technology assessment and amending Directive 2011/24/EU (the HTA Regulation). The HTA Regulation covers new
medicines and certain new medical devices. Member states will be able to use common HTA tools, methodologies and procedures across the EU, working
together in four main areas: 1) joint clinical assessments focusing on the most innovative health technologies with the most potential impact for patients; 2)
joint scientific consultations whereby developers can seek advice from HTA authorities; 3) identification of emerging health technologies to identify
promising technologies early; and 4) continuing voluntary cooperation in other areas. Individual member states will continue to be responsible for assessing
non-clinical (e.g., economic, social, ethical) aspects of health technology, and making decisions on pricing and reimbursement. The HTA Regulation will
become applicable in January 2025. For other countries outside of the EU, such as countries in Eastern Europe, Latin America or Asia, the requirements
governing the conduct of clinical studies, product licensing, pricing and reimbursement vary from country to country. In all cases, again, the clinical studies
are conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of
Helsinki.

The United Kingdom (UK) formally left the EU on January 31, 2020 and a transitional period applied until the UK’s withdrawal from the EU
became fully effective on December 31, 2020. As of January 1, 2021, the UK is a “third country” with respect to the EU (subject to the terms of the EU UK
Trade Agreement), and EU law ceased to apply directly in the UK. However, the UK has retained the EU regulatory regime with certain modifications as
standalone UK legislation. Therefore, the UK regulatory regime is currently similar to EU regulations, but under proposed legislation, the Medicines and
Medical Devices Act, the UK may adopt changed regulations that may diverge from the EU legislative regime for medicines, including their research,
development and commercialization, and has issued a consultation document with respect to future changes. For a two-year period, which started in
January 2021, the UK has adopted transitional provisions that apply to the importation of medicines into the UK and decision reliance procedures with
respect to certain EMA marketing authorization application procedures.

If we fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines, suspension or withdrawal of

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

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Human Capital Resources

As of February 24, 2022, we employed 372 full-time employees, of which 295 were engaged in research and development activities, including

preclinical, manufacturing and clinical study related functions, and 77 were engaged in general administrative activities, including commercial, corporate
development, finance, legal, human resources, information technology, facilities and other general and administrative functions. We have never had a work
stoppage, and none of our employees are represented by a labor organization or under any collective bargaining arrangements. We consider our relationship
with our employees to be good.

Talent, Growth and Retention

We appreciate the importance of retention, growth and development of our employees. We seek and value employees who have substantial
experience in the discovery, development, manufacture and commercialization of innovative therapies in a complex regulatory environment. For certain
key functions, especially in research and development and manufacturing activities, we require specialized scientific and gene therapy expertise. To attract
and retain the talent we require, we believe we offer competitive compensation, including salary, cash incentive awards and equity awards, along with
competitive benefits packages, including medical, dental, vision and life insurance, flexible spending accounts, short- and long-term disability and
matching contributions to a 401(k) tax-deferred savings plan. All full-time employees are eligible to participate in the same health and welfare and
retirement savings plans. Additionally, we provide professional development programs and on-demand learning opportunities to cultivate talent at all levels
throughout our company.

Diversity, Equity and Inclusion

We believe that a diverse, equitable and inclusive culture fosters innovation, which is integral to our mission of improving lives through the curative

potential of gene therapy. We are firmly committed to providing equal opportunity in all aspects of employment and aim for appropriate representation of
gender, race and ethnicity at every level of our company. We have emphasized diversity, equity and inclusion as part of our company culture, as set out in
our Code of Business Conduct and Ethics, and we are determined to support further progress in this area.

Health and Safety

We prioritize the health and safety of our employees and have implemented policies to minimize the spread of COVID-19 in our workplace. At
various times during the COVID-19 pandemic, we have implemented work-from-home policies for all employees who are not essential to be onsite, as well
as policies relating to testing, vaccination, facial coverings, social distancing and contact tracing. Additionally, we have provided employees with resources
to help persevere through the pandemic, including work-from-home technology packages and personal protective equipment.

Available Information

Our principal offices are located at 9804 Medical Center Drive, Rockville, MD 20850, and our telephone number is (240) 552-8181. Our website

address is www.regenxbio.com. The information contained in, or that can be accessed through, our website is not a part of, or incorporated by reference in,
this Annual Report on Form 10-K. We file annual, quarterly, and current reports, proxy statements, and other documents with the SEC under the Exchange
Act. You may obtain any reports, proxy and information statements, and other information that we file electronically with the SEC at www.sec.gov.

You also may view and download copies of our SEC filings free of charge at our website as soon as reasonably practicable after we electronically

file such material with, or furnish it to, the SEC. The information contained on, or that can be accessed through, our website will not be deemed to be
incorporated by reference in, and is not considered part of, this Annual Report on Form 10-K. Investors should also note that we use our website, as well as
SEC filings, press releases, public conference calls and webcasts, to announce financial information and other material developments regarding our
business. We use these channels, as well as any social media channels listed on our website, to communicate with investors and members of the public
about our business. It is possible that the information that we post on our social media channels could be deemed material information. Therefore, we
encourage investors, the media and others interested in our company to review the information that we post on our social media channels.

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ITEM 1A.

RISK FACTORS

You should carefully consider the risk factors set forth below as well as the other information contained in this Annual Report on Form 10-K and in

our other public filings in evaluating our business. Any of the following risks could materially and adversely affect our business, financial condition or
results of operations. In addition, these risks could cause actual results and developments to differ materially and adversely from those projected in the
forward-looking statements contained in this Annual Report on Form 10-K (please read the Information Regarding Forward-Looking Statements
appearing at the beginning of this Form 10-K). Additional risks and uncertainties not currently known to us or that we currently view to be immaterial may
also materially adversely affect our business, financial condition or results of operations. In these circumstances, the market price of our common stock
would likely decline and you could lose all or part of your investment.

Risk Factor Summary

Risks Related to Our NAV Technology Platform and the Development of Our Product Candidates

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The COVID-19 pandemic may affect our business, operations and preclinical and clinical development timelines and plans.

It is difficult to predict the time and cost of development and of obtaining regulatory approval for our product candidates.

Our business depends substantially on the success of our lead product candidates.

We have limited clinical results for most of our product candidates.

Regulatory authorities may not consider the endpoints of our clinical trials to provide clinically meaningful results.

The results from our preclinical studies or clinical trials for our product candidates may not support as broad a marketing approval as we seek,
and we may be required to conduct additional clinical trials or evaluate subjects for a follow-up period.

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

Undesirable side effects may delay or prevent our product candidates and those of our licensees or collaborators from obtaining regulatory
approval, limit their commercial potential or result in significant negative consequences following approval.

We cannot predict when, or if, we will obtain regulatory approval to commercialize a product candidate.

Risks Related to Our Financial Position

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We face significant competition and there is a possibility that our competitors may achieve regulatory approval before us or develop products
that are safer, less expensive or more convenient or effective than ours.

We expect to normally incur losses for the foreseeable future and may never again achieve or maintain profitability.

Failure to obtain additional funding when needed may force us to delay, limit or terminate certain of our licensing activities, product
development efforts or other operations.

We have never generated revenue from sales of our product candidates and may never do so in the future.

Risks Related to Third Parties

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If third parties do not meet our deadlines, our preclinical and clinical development programs could be delayed or unsuccessful.

If our licensing arrangements or collaborations are not successful, our business could be harmed.

Our reliance on third parties requires us to share our trade secrets, which increases the possibility that a competitor will discover them or that
our trade secrets will be misappropriated or disclosed.

Risks Related to Manufacturing

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Products intended for use in gene therapies are novel, complex and difficult to manufacture.

Delays in obtaining regulatory approval of our manufacturing process or disruptions in our manufacturing process may delay or disrupt our
commercialization efforts.

Third parties we rely upon to conduct our product manufacturing may not perform satisfactorily.

We are required to comply with ongoing manufacturing regulatory requirements.

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Risks Related to the Commercialization of Our Product Candidates

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•

If we are unable to establish sales and marketing capabilities or enter into agreements with third parties to market and sell our product
candidates, if approved, we may be unable to generate any product revenue.

We may not achieve our projected development goals in the timeframes we announce and expect.

Even if we receive regulatory approval, we still may not be able to successfully commercialize our product candidates.

Failure to obtain or maintain adequate insurance coverage and reimbursement for our products, if approved, could limit our ability to market
those products and decrease our ability to generate product revenue.

Government price controls could restrict the amount that we are able to charge for any of our products, if approved.

Risks Related to Our Business Operations

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We may not be successful in our efforts to identify or discover additional product candidates.

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

We may face liability for our conduct and that of our employees, principal investigators, consultants or commercial partners.

We may face product liability lawsuits.

We could become subject to fines or penalties related to the failure to comply with environmental, health and safety laws.

We and our collaborators or other contractors or consultants may suffer cybersecurity breaches.

Our customers are concentrated and therefore the loss of a significant customer may harm our business.

Risks Related to Our Intellectual Property

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Our intellectual property rights may be limited by the terms and conditions of licenses granted to us by others.

We must obtain and maintain patent protection for our products and technology to protect our intellectual property rights.

Our intellectual property licenses with third parties may be subject to disagreements.

We are required to comply with the agreements under which we license intellectual property rights from third parties.

We may not be successful in obtaining necessary rights to our product candidates through acquisitions and in-licenses.

We may not be able to protect our intellectual property rights in the United States and throughout the world.

Issued patents covering our NAV Technology Platform or our product candidates could be found invalid or unenforceable.

Third parties may initiate legal proceedings alleging that we are infringing their intellectual property rights.

We may be subject to intellectual property claims.

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

We may be unable to obtain patent term extension and data exclusivity for our product candidates.

Risks Related to Ownership of Our Common Stock

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Our operating results are difficult to predict and could cause the price of our common stock to fluctuate substantially.

Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish proprietary rights.

Future acquisitions or strategic partnerships may increase our capital requirements, dilute our stockholders, cause us to incur debt or assume
contingent liabilities and subject us to other risks.

Provisions in our certificate of incorporation and bylaws might discourage, delay or prevent a change in control.

Our certificate of incorporation includes exclusive forum clauses for certain litigation.

Our business could be negatively affected as a result of the actions of activist stockholders.

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Risks Related to our NAV Technology Platform and the Development of Our Product Candidates

Our business, operations and preclinical and clinical development timelines and plans could be adversely affected by the effects of the COVID-19
pandemic, including further resurgences or multiple waves of infections, and other public health crises.

The COVID-19 pandemic and other public health crises in regions where we have clinical trial sites or other business operations could have a
material adverse effect on our business, operations and preclinical and clinical development timelines and plans, and could significantly constrain or disrupt
the operations of third parties upon which we rely, including contract research organizations (CROs) and contract manufacturing organizations (CMOs).

In response to the COVID-19 pandemic, federal, state, local and foreign governments have put in place quarantines, executive orders, shelter-in-

place orders, guidelines and other similar orders and restrictions intended to control the spread of the disease. Such orders and restrictions have resulted in
business closures, work stoppages, delays, work-from-home policies, travel restrictions and cancellations of events, among other effects that could
negatively impact productivity and disrupt our business and operations. Our offices, laboratories, clinical trial sites, prospective clinical trial sites, CROs,
CMOs and other collaborators and partners are located in jurisdictions where such orders and restrictions have been enforced, and further resurgences or
waves of infections may lead to similar orders and restrictions in the future. At various times during the COVID-19 pandemic, we have implemented work-
from-home policies for all employees who are not essential to be onsite, as well as policies relating to testing, vaccination, facial coverings, social
distancing and contact tracing, and we may take further actions that alter our operations, as may be required by federal, state or local authorities or which
we determine are in the best interests of our employees. The increase in remote working may result in increased cybersecurity, privacy and fraud risks.

The COVID-19 pandemic has caused delays to our clinical trials and may further delay or prevent us from proceeding with our clinical trials. Our
clinical trial site initiation and subject enrollment has been delayed, and may be further delayed or suspended, due to site closures, personnel turnover and
prioritization of resources toward the COVID-19 pandemic. In addition, some subjects have been, and may continue to be, disinterested in participating in
trials with regular follow-up visits during a pandemic, and some subjects have been, and may continue to be, unable or unwilling to comply with clinical
trial protocols. Further, some clinical trial vendors have experienced significant delays in providing necessary equipment, supplies and services during the
COVID-19 pandemic, and our ability to obtain clinical samples may be adversely affected. Our ability to conduct follow-up visits with treated subjects may
be limited if travel or healthcare services are impeded. Similarly, our ability to recruit and retain principal investigators and other clinical trial personnel
could be adversely affected.

The COVID-19 pandemic may impact our ability to procure resources, raw materials or components necessary for our research studies and
preclinical and clinical development, and prices have escalated due to limited supplies of such resources, raw materials and components. For instance, our
supply chain may be disrupted or our CMOs may be required to dedicate their facilities, personnel and resources to support vaccine production.
Additionally, required inspections and reviews by regulatory authorities may be delayed due to a focus of resources on COVID-19 as well as continued
travel and other restrictions. Significant delays in the timing and completion of our research studies and preclinical and clinical development would
increase our costs and could adversely affect our ability to obtain marketing approval from regulatory authorities for the commercialization of our product
candidates. Further, meetings with regulatory authorities that would be important in progressing our programs may be delayed or impeded in connection
with the COVID-19 pandemic.

The construction of our new headquarters, including our current good manufacturing practice (cGMP) production facility, has been delayed from
our original estimates, and may be delayed further, due to various government orders and restrictions relating to the COVID-19 pandemic. The potential
impact of any such delay is unpredictable but may include  significant  additional costs  and  disruptions  to  our  operations.

The spread of COVID-19 has caused a broad impact globally and may materially affect our business, financial condition and results of operations,
as well as continue to increase the volatility and adversely affect the value of our common stock. While the full extent of the economic impact and duration
of the COVID-19 pandemic may be difficult to assess or predict, the continuation of prolonged adverse economic conditions (including due to further
resurgences or waves of COVID-19 infections) may reduce our ability to access capital and adversely affect our liquidity. In addition, if the business and
operations of our licensees or collaborators are adversely affected by the COVID-19 pandemic, our revenues could in turn be adversely affected.

Scientific and economic analyses of the COVID-19 pandemic, including the expected impact of variants, vaccinations and therapeutics, continue to

evolve and we will continue to monitor the situation closely. The ultimate impact of the COVID-19 pandemic and other public health crises is highly
unpredictable and subject to change. We are not yet certain about the full extent of the potential impact of COVID-19 on our business, operations and
preclinical and clinical development. To the extent COVID-19 adversely affects our business, financial condition and results of operations, as well as
global economic conditions more generally, it may also heighten many of the other risk factors described in this Annual Report on Form 10-K.

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Our gene therapy product candidates are based on a novel technology that makes it difficult to predict the time and cost of development and of
subsequently obtaining regulatory approval. Only a few gene therapy products have been approved in the United States, the European Union or
elsewhere.

We have concentrated our research and development efforts on our proprietary adeno-associated virus (AAV) gene delivery platform (our NAV

Technology Platform), and we have granted licenses to certain intellectual property related to our NAV Technology Platform to licensees (our NAV
Technology Licensees). Our future success depends on our and our NAV Technology Licensees’ successful development and commercialization of viable
gene therapy product candidates. There can be no assurance that we or our NAV Technology Licensees will not experience problems or delays in
developing current or future product candidates or that such problems or delays will not cause unanticipated costs, or that any such development problems
can be solved. We also may experience unanticipated problems or delays in expanding our manufacturing capacity, and this may prevent us from
completing our clinical trials, meeting the obligations of our collaborations or commercializing our products on a timely or profitable basis, if at all. For
example, we, a partner or another group may uncover one or more previously unknown risks associated with AAV or our NAV Technology Platform, and
this may prolong the period of observation required for obtaining regulatory approval, necessitate additional clinical testing or invalidate our NAV
Technology.

In addition, the clinical trial requirements of the U.S. Food and Drug Administration (the FDA), the European Medicines Agency (the EMA) and

other regulatory authorities and the criteria these regulators use to determine the quality, 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 significantly more expensive and take longer than for other, better known or more extensively studied product candidates.
Only a few gene therapy products have been approved in the United States, the European Union or elsewhere. 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. Furthermore, approvals by one regulatory authority may not be indicative of what other regulatory
authorities may require for approval, and approvals of ex vivo gene therapy products may not be indicative of what may be required for approval of in vivo
gene therapy products.

Regulatory requirements governing gene and cell therapy products have changed frequently and may continue to change in the future. Additionally,

we may seek regulatory approval in territories outside the United States and the European Union, which may have their own regulatory authorities along
with frequently changing requirements or guidelines. The regulatory review committees and advisory groups in the United States, the European Union and
elsewhere, and any 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. As we advance our product candidates, we will be required to consult with these regulatory
and advisory groups, and comply with applicable guidelines. If we fail to do so, we may be required to delay or discontinue development of certain of our
product candidates. These additional processes may result in a review and approval process that is 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 product revenue, and our business, financial condition, results of operations and prospects would be materially harmed.

Our business depends substantially on the success of our lead product candidates. If we are unable to obtain regulatory approval for, or successfully
commercialize, our lead product candidates, our business will be materially harmed.

Several of our lead product candidates are in the early stages of development and all of our lead product candidates will require substantial clinical
development and testing, manufacturing bridging studies and process validation and regulatory approval prior to commercialization. Successful continued
development and ultimate regulatory approval of our lead product candidates is critical for our future business success and our ability to generate product
revenue. We have invested, and will continue to invest, a significant portion of our financial resources in the development of our lead product candidates.
We will need to raise sufficient funds for, and successfully complete, our clinical trials of our lead product candidates in appropriate subjects. The future
regulatory and commercial success of these product candidates is subject to a number of risks, including the following:

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we may not have sufficient financial and other resources or patient availability to complete the necessary clinical trials for our lead product
candidates;

we may not be able to provide evidence of quality, efficacy and safety for our lead product candidates;

we do not know the degree to which our lead product candidates will be accepted by patients, the medical community and third-party payors
as a therapy for the respective diseases to which they relate, even if approved;

the results of our clinical trials may not meet the level of statistical or clinical significance required by the FDA, EMA or comparable foreign
regulatory bodies for marketing approval, and modifications to the design of our clinical trials could delay their enrollment, commencement
or completion;

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•

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•

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subjects in our clinical trials may die or suffer other adverse effects for reasons that may or may not be related to our lead product candidates;

subjects in clinical trials undertaken by our licensees or collaborators, or undertaken by others using AAV, may die or suffer other adverse
effects for reasons that may or may not be related to our NAV Technology Platform or AAV;

certain patients’ immune systems might prohibit the successful delivery of certain gene therapy products to the target tissue, thereby limiting
the treatment outcomes;

we may not successfully establish commercial manufacturing capabilities;

if approved for treatment of the expected conditions, our lead product candidates will likely compete with other treatments then available,
including the off-label use of products already approved for marketing and other therapies currently available or which may be developed;

our products and products developed by our licensees and collaborators may not maintain a continued acceptable safety profile following
regulatory approval;

we may not maintain compliance with post-approval regulation and other requirements; and

we may not be able to obtain, maintain or enforce our rights under our licensed patents and other intellectual property rights.

Of the large number of biologics and drugs in development in the biopharmaceutical industry, only a small percentage result in the submission of a

Biologics License Application (BLA) to the FDA or marketing authorization application (MAA) to the EMA and even fewer are approved for
commercialization. Due to several of the risk factors identified in this Annual Report on Form 10-K, we may not achieve our goal to have multiple AAV
vector-based gene therapies that are approved or in pivotal trials through our internal and partnered programs by the end of 2025. Furthermore, even if we
do receive regulatory approval to market our lead product candidates, any such approval may be subject to limitations on the indicated uses for which we
may market the product. Accordingly, even if we are able to obtain the requisite financing to continue to fund our development programs, we cannot assure
you that our lead product candidates will be successfully developed or commercialized. If we or any of our future development partners are unable to
develop, or obtain regulatory approval for, or, if approved, successfully commercialize, our lead product candidates, we may not be able to generate
sufficient revenue to continue our business.

We have limited clinical results for most of our product candidates and success in preclinical studies or early clinical trials may not be indicative of
results obtained in later trials.

Gene therapy development has inherent risks. Most of our lead product candidates have limited clinical and preclinical results and we may

experience unexpected results in the future. We or any of our future development partners will be required to demonstrate through adequate and well-
controlled clinical trials that our product candidates containing our proprietary vectors are safe and effective, with a favorable benefit-risk profile, for use in
their target indications before we can seek regulatory approvals for their commercial sale. Drug development is a long, expensive and uncertain process,
and delay or failure can occur at any stage of development, including after commencement of any of our clinical trials.

The results of preclinical studies and early clinical trials are not always predictive of future results. Any product candidate we or any of our future

development partners advance into clinical trials, including our lead product candidates, may not have favorable results in later clinical trials, if any, or
receive regulatory approval. There is a high failure rate for drugs and biologic products proceeding through clinical trials. Data obtained from preclinical
and clinical activities are subject to varying interpretations that may delay, limit or prevent regulatory approval. In addition, we may experience regulatory
delays or rejections as a result of many factors, including due to changes in regulatory policy during the period of our product candidate development. Any
such delays could materially harm our business, financial condition, results of operations and prospects.

Because we are developing product candidates for the treatment of certain diseases in which there is little clinical experience and we are using new
endpoints or methodologies, there is increased risk that the FDA, the EMA or other regulatory authorities may not consider the endpoints of our
clinical trials to provide clinically meaningful results and that these results may be difficult to analyze.

During the FDA review process, we will need to identify success criteria and endpoints such that the FDA will be able to determine the clinical

efficacy and safety profile of our product candidates. As we are developing novel treatments for diseases in which there is little clinical experience with
new endpoints and methodologies, there is heightened risk that the FDA, the EMA or other regulatory bodies may not consider the clinical trial endpoints
to provide clinically meaningful results (reflecting a tangible benefit to patients). In addition, the resulting clinical data and results may be difficult to
analyze. Even if the FDA does find our

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success criteria to be sufficiently validated and clinically meaningful, we may not achieve the pre-specified endpoints to a degree of statistical significance.
Further, even if we do achieve the pre-specified criteria, we may produce results that are unpredictable or inconsistent with the results of the non-primary
endpoints or other relevant data. The FDA also weighs the benefits of a product against its risks, and the FDA may view the efficacy results in the context
of safety as not being supportive of regulatory approval. The EMA and other regulatory authorities in the European Union and other countries may make
similar comments with respect to these endpoints and data.

The results from our preclinical studies or clinical trials for our product candidates may not support as broad a marketing approval as we seek, and the
FDA, the EMA or other regulatory authorities may require us to conduct additional clinical trials or evaluate subjects for an additional follow-up
period.

While we believe our product candidates should be applicable for the treatment of patients with certain conditions, the results from our preclinical
and planned clinical trials may not support as broad of a marketing approval as we seek. Even if we obtain regulatory approval for our product candidates,
we may be required by the FDA, the EMA or other regulatory bodies to conduct additional clinical trials to support approval of our product candidates for
patients diagnosed with different mutations of the respective diseases to which our product candidates relate. This could result in our experiencing
significant increases in costs and substantial delays in obtaining, or never obtaining, marketing approval for our product candidates to treat patients. The
inability to market our product candidates to treat patients for the intended indications would materially harm our business, financial condition, results of
operations and prospects.

We may encounter substantial delays in our planned 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 candidates. Clinical testing is expensive, time-consuming and uncertain as to outcome. A failure of one
or more clinical trials can occur at any stage of testing. Events that may prevent successful or timely commencement and completion of preclinical and
clinical development include:

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

delays in reaching agreement on acceptable terms with prospective CROs and clinical trial sites;

delays in opening clinical trial sites or obtaining required institutional review board or independent Ethics Committee approval at each
clinical trial site;

delays in recruiting and enrolling suitable subjects to participate in our clinical trials, due to factors such as the size of the subject population,
process for identifying subjects, design of protocols, eligibility and exclusive criteria, perceived risks and benefits of the relevant product
candidate or gene therapy generally, availability of competing therapies and trials, severity of the disease under investigation, need and length
of time required to discontinue other potential therapies, availability of genetic testing, availability and proximity of trial sites for prospective
subjects, ability to obtain subject consent and referral practices of physicians;

imposition of a clinical hold by regulatory authorities, including as a result of a serious adverse event or after an inspection of our clinical
trial operations or trial sites;

failure by us, any CROs we engage or any other third parties to adhere to clinical trial requirements;

failure to perform in accordance with the FDA good clinical practice (GCP), or applicable regulatory guidelines in the European Union and
other countries;

delays in the testing, validation, manufacturing and delivery of our product candidates to the clinical sites, including delays by third parties
with whom we have contracted to perform;

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

clinical trial sites or subjects dropping out of a trial;

selection of clinical endpoints that require prolonged periods of clinical observation or analysis of the resulting data;

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

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occurrence of serious adverse events in trials of the same class of agents conducted by other sponsors; or

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

Any inability to successfully complete research studies, preclinical and clinical development could result in additional costs to us or impair our
ability to generate revenues from product sales, regulatory and commercialization milestones and royalties. In addition, if we make manufacturing or
formulation changes to our product candidates, we may need to conduct additional studies to bridge our modified product candidates to earlier versions.
Clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize our product candidates or allow our
competitors to bring products to market before we do, which could impair our ability to successfully commercialize our product candidates and may harm
our business, financial condition, results of operations and prospects.

Additionally, if the results of our planned 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 for our product candidates, if at all;

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

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

be subject to changes in the way the product is administered;

be required to perform additional clinical trials to support approval or be subject to additional post-marketing testing or other requirements;

have regulatory authorities withdraw, vary or suspend their approval of the product or impose restrictions on its distribution in the form of a
modified risk evaluation and mitigation;

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

be sued; or

experience damage to our reputation.

Our NAV Technology Platform, our product candidates or our licensees’ or collaborators’ product candidates, and the process for administering such
product candidates, may cause undesirable side effects or have other properties that could delay or prevent regulatory approval of product candidates,
limit the commercial potential or result in significant negative consequences following any potential marketing approval.

There have been several significant adverse side effects in gene therapy treatments in the past, including reported cases of leukemia in trials using
lentivirus vectors and death seen in trials sponsored by other companies using adenovirus vectors and AAV vectors, including NAV vectors. 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. Possible adverse side effects that could occur with treatment with gene therapy products include an immunologic reaction early after
administration which could substantially limit the effectiveness of the treatment. In previous clinical trials involving AAV vectors for gene therapy, some
subjects experienced the development of a T-cell response, whereby after the vector is within the target cell, the cellular immune response system triggers
the removal of transduced cells by activated T-cells. Furthermore, in clinical trials sponsored by other companies involving AAV vectors administered
intravitreally for the treatment of retinal conditions, serious adverse reactions such as panuveitis and loss of vision have occurred.  In addition to side
effects caused by product candidates, the administration process or related procedures also can cause adverse side effects. If any such adverse events occur
in our or third party trials, our clinical trials could be suspended or terminated.

As a result of these concerns, we may decide, or the FDA, the European Commission, the EMA or other regulatory authorities could order us, to

halt, delay or amend preclinical development or clinical development of our product candidates or we may be unable to receive regulatory approval of our
product candidates for any or all targeted indications. Even if we are able to demonstrate that all future 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 any of our product candidates, the commercial prospects of such product candidates may be harmed and our ability to
generate product revenues from any of these product candidates may be delayed or eliminated. Any of these occurrences may harm our ability to develop
other product candidates and may harm our business, financial condition and prospects significantly.

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Additionally, if any of our product candidates receives marketing approval, the FDA could require us to adopt a Risk Evaluation and Mitigation

Strategy (REMS) and other regulatory authorities could impose other specific obligations as a condition of approval to ensure that the benefits of our
product candidates outweigh their risks, which could delay approval of our product candidates. A REMS may include, among other things, a medication
guide outlining the risks of the product for distribution to patients; a communication plan to health care practitioners or patients; and elements to assure safe
use, which can severely restrict the distribution of a product by, for example, requiring that health care providers receive particular training and obtain
special certification prior to prescribing and dispensing the product, limiting the healthcare settings in which the product may be dispensed, and subjecting
patients to monitoring and enrollment in a registry. If the FDA requires us to adopt a REMS for our products and we are unable to comply with its
requirements, the FDA may deem our products to be misbranded and we may be subject to civil money penalties. The European Commission, the EMA
and other regulatory authorities may, following grant of marketing authorization in their territory, impose similar obligations.

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

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

Even if we complete the necessary preclinical studies and clinical trials, we cannot predict when, or if, we will obtain regulatory approval to
commercialize a product candidate in the United States or elsewhere, and the approval may be for a narrower indication than we seek.

We cannot commercialize a product candidate until the appropriate regulatory authorities have reviewed and approved the product candidate. Even if

our product candidates meet their safety and efficacy endpoints in clinical trials, the regulatory authorities may not complete their review processes in a timely
manner or we may not be able to obtain regulatory approval. Additional delays may result if an FDA Advisory Committee or other regulatory authority
recommends non-approval or restrictions on approval. In addition, we may experience delays or rejections based on additional government regulation from
future legislation or administrative action or based on changes in regulatory authority policy during the period of product development, clinical trials and the
review process.

Regulatory authorities also may approve a product candidate for more limited indications than requested or they may impose significant limitations

in the form of narrow indications, warnings or a REMS. These regulatory authorities may require precautions or contra-indications with respect to
conditions of use or they may grant approval subject to the performance of costly post-marketing clinical trials. In addition, regulatory authorities may not
approve the labeling claims that are necessary or desirable for the successful commercialization of our product candidates. Any of the foregoing scenarios
could materially harm the commercial prospects for our product candidates and materially harm our business, financial condition, results of operations and
prospects.

Further, the regulatory authorities may require concurrent approval or the CE mark (a mandatory conformity assessment marking for certain
products sold within the European Economic Area (the EEA)) of a companion diagnostic device, since it may be necessary to use FDA-cleared or FDA-
approved, or CE-marked, diagnostic tests or diagnostic tests approved by other comparable foreign regulatory authorities to diagnose patients or to assure
the safe and effective use of our product candidates in trial subjects. FDA refers to such tests as in vitro companion diagnostic devices. The FDA has
articulated a policy position that, when safe and effective use of a therapeutic product depends on a diagnostic device, the FDA generally will require
approval or clearance of the companion diagnostic device at the same time that FDA approves the therapeutic product. The FDA’s guidance allows for two
exceptions to the general rule of concurrent drug/device approval, namely, when the therapeutic product is intended to treat serious and life-threatening
conditions for which no alternative exists, and when a serious safety issue arises for an approved therapeutic agent, and no FDA-cleared or FDA-approved
companion diagnostic test is yet available. It is unclear how the FDA will apply this policy to our current or future gene therapy product candidates. Should
the FDA deem genetic tests used for diagnosing patients for our therapies to be in vitro companion diagnostics requiring FDA clearance or approval, we
may face significant delays or obstacles in obtaining approval of a BLA for our product candidates.

In the European Union, companion diagnostics are subject to the European Union Directive on in vitro diagnostic medical devices and its
implementation in the European Union Member States. Recently revised European Union laws on in vitro diagnostics will apply beginning in 2022 and
provide stricter requirements for in vitro diagnostic medical devices and impose additional obligations on manufacturers of in vitro diagnostic medical
devices that may impact the development and authorization of our product candidates in the European Union. For example, the new regulation extends the
requirement for performance assessment procedures and requires greater involvement of notified bodies in the development of in vitro diagnostic medical
devices. This may result in additional regulatory and premarket requirements to market new in vitro diagnostic medical devices. Companies producing in
vitro diagnostic medical devices will be required to have a responsible person to oversee regulatory compliance. In addition, the new regulation introduces
risk classification of in vitro diagnostic medical devices and significantly increases the number of products that will be subject to stricter regulation. It also
introduces the requirement to involve a notified body in the conformity assessment procedure.

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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 our product candidates 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 candidates in those countries. 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 products, if approved, is also subject to approval. We intend to submit a
marketing authorization application to EMA for approval of our product candidates by the European Commission in the European Union. However,
obtaining such approval from the European Commission following the opinion of EMA is a lengthy and expensive process. Additionally, the approval
procedures in the United Kingdom (UK) for our product candidates may be uncertain following the UK’s exit from the European Union.

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 harmed.

We face significant competition in an environment of rapid technological change and there is a possibility that our competitors may achieve regulatory
approval before us or develop products that are safer, less expensive or more convenient or effective than ours, which may harm our financial
condition and our ability to successfully market or commercialize our product candidates.

The biotechnology and pharmaceutical industries, including the gene therapy field, are characterized by rapidly changing technologies, significant

competition and a strong emphasis on intellectual property. We face substantial competition from many different sources, including large and specialty
pharmaceutical and biotechnology companies, academic research institutions, government agencies and public and private research institutions.

We are aware of a number of companies focused on developing gene therapies in various indications, as well as a number of companies addressing

other methods for modifying genes and regulating gene expression. Any advances in gene therapy technology made by a competitor may be used to
develop therapies that could compete against any of our product candidates.

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 opportunity 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 any products 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 ours, 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 our potential product candidates uneconomical or obsolete, and we may not
be successful in marketing our product candidates against those of competitors. The availability of our competitors’ products could limit the demand, and
the price we are able to charge, for any products that we may develop and commercialize.

Even though we have obtained orphan drug exclusivity for certain product candidates, that exclusivity may not effectively protect the product

candidate from competition because the FDA may subsequently approve another drug for the same condition if the FDA concludes that the latter drug is
not the same drug or is clinically superior in that it is shown to be safer, more effective or makes a major contribution to patient care. In the European
Union, marketing authorization may be granted to a similar medicinal product for the same orphan indication if:

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the second applicant can establish in its application that its medicinal product, although similar to the orphan medicinal product already
authorized, is safer, more effective or otherwise clinically superior;

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the holder of the marketing authorization for the original orphan medicinal product consents to a second orphan medicinal product
application; or

the holder of the marketing authorization for the original orphan medicinal product cannot supply sufficient quantities of orphan medicinal
product.

Risks Related to Our Financial Position

We have incurred cumulative net losses and have had few profitable quarters since inception. We expect to regularly incur losses and may never again
achieve or maintain profitability.

Since inception, we have incurred cumulative net losses. We have historically financed our operations primarily through private and public offerings

of our equity securities and licensing rights to our NAV Technology Platform, including milestone payments and royalties from our NAV Technology
Licensees. We have devoted substantially all of our efforts to research and development, including preclinical and clinical development of our
product candidates, and licensing our NAV Technology Platform, as well as to building out our team. We expect that it could be several years, if ever,
before we commercialize a product candidate. We license certain intellectual property related to our NAV Technology Platform to our NAV Technology
Licensees and collaborators. Our NAV Technology Licensees and collaborators have multiple preclinical studies and clinical trials in progress. However,
only one gene therapy product based on our licensing program, Novartis AG’s Zolgensma, has been approved or commercialized. Other than revenue in
connection with sales of Zolgensma, we may generate only limited recurring revenue in the near term from our current NAV Technology Licensees and
collaborators. We expect to continue to incur significant expenses and regularly incur operating losses for the foreseeable future. The net losses we incur
may fluctuate significantly from quarter to quarter. We anticipate that our expenses will increase substantially if, and as, we:

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continue our research studies and preclinical and clinical development of our product candidates, including our lead product candidates;

initiate additional preclinical studies and clinical trials for our lead product candidates and future product candidates, if any;

initiate additional activities relating to manufacturing, including building out additional laboratory and manufacturing capacity;

seek to identify additional product candidates;

prepare our BLA and MAA for our lead product candidates and seek marketing approvals for any of our other product candidates that
successfully complete clinical trials, if any;

further develop our NAV Technology Platform;

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

maintain, expand and protect our intellectual property portfolio and enforce our intellectual property rights; and

acquire or in-license other product candidates and technologies.

For us to become consistently profitable, we and our licensees and collaborators must develop and commercialize product candidates with

significant market potential. This will require us and our licensees and collaborators to be successful in a range of business challenges, including expansion
of the licensing of our NAV Technology Platform, completing preclinical studies of product candidates, commencing and completing clinical trials of
product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling those products for which we may
obtain marketing approval and satisfying any post-marketing requirements. We may never succeed in any or all of these activities and, even if we do, we
may never consistently generate revenues that are sufficient to achieve profitability, and we may not be able to sustain or increase profitability on a
quarterly or annual basis. Our failure to become consistently profitable and 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 you to lose all or part of your investment.

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We may need to raise additional funding, which 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 licensing activities, product development efforts or other operations.

We expect to require substantial future capital in order to complete research studies, preclinical and clinical development for our current product

candidates and any future product candidates, and potentially commercialize these product candidates. We expect our spending levels to increase in
connection with our preclinical and clinical trials of our product candidates. In addition, if we obtain marketing approval for any of our product candidates,
we expect to incur significant expenses related to product sales, medical affairs, marketing, manufacturing and distribution. Accordingly, we will need to
obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we
could be forced to delay, reduce or eliminate certain of our licensing activities, our research and development programs or other operations.

Our operations have consumed significant amounts of cash since inception. Our future capital requirements will depend on many factors, including:

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the timing of enrollment, commencement and completion of our clinical trials;

the results of our clinical trials;

the results of our preclinical studies for our product candidates and any subsequent clinical trials;

the scope, progress, results and costs of drug discovery, laboratory testing, preclinical development and clinical trials for our product
candidates;

the costs associated with building out additional laboratory and manufacturing capacity;

the costs, timing and outcome of regulatory review of our product candidates;

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

revenue, if any, received from commercial sales of our products, should any of our product candidates receive marketing approval;

revenue received from commercial sales of Zolgensma and other revenue, if any, received in connection with commercial sales of our
licensees’ and collaborators’ products, should any of their product candidates receive marketing approval;

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

our current licensing agreements or collaborations remaining in effect, including our Collaboration and License Agreement with AbbVie;

our ability to establish and maintain additional licensing agreements or collaborations on favorable terms, if at all; and

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

Many of these factors are outside of our control. Identifying potential 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
regulatory and marketing approval and achieve product sales. In addition, our product candidates, if approved, may not achieve commercial success. Our
product revenues, if any, and any commercial milestones or royalty payments under our licensing agreements, will be derived from or based on sales of
products that may not be commercially available for many years, if at all. In addition, revenue from our NAV Technology Platform licensing is dependent
in part on the clinical and commercial success of our licensing partners, including the commercialization of Zolgensma, and in part on maintaining our
license agreements with our licensor partners, including GlaxoSmithKline LLC (GSK) and the University of Pennsylvania (Penn). Accordingly, we will
need to continue to rely on additional financing to achieve our business objectives.

The issuance of additional securities, whether equity or debt, by us, or the possibility of such issuance, may cause the market price of our common
stock to decline. Adequate additional financing may not be available to us on acceptable terms, or at all. We also could be required to seek funds through
arrangements with partners or otherwise that may require us to relinquish rights to our intellectual property, our product candidates or otherwise agree to
terms unfavorable to us.

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Although we have generated significant revenues from licensing our NAV Technology Platform, we have never generated revenue from sales of our
product candidates and may never do so in the future.

We have generated significant revenues from licensing our NAV Technology Platform, including sublicense fees, milestone payments and royalties

on net sales of a licensed product, Zolgensma. However, our ability to generate revenue from sales of our internal product candidates will depend on our
ability, alone or with partners, to successfully complete the development of, and obtain the regulatory approvals necessary to commercialize, our product
candidates.

Our ability to generate future revenues from sales of our product candidates and in connection with sales of our licensees’ and collaborators’

products depends heavily on our, and our licensees’ and collaborators’, success in:

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completing research studies and preclinical and clinical development of product candidates and identifying new gene therapy product
candidates;

obtaining regulatory and marketing approvals for product candidates for which clinical trials are completed;

commercializing product candidates for which regulatory and marketing approval is obtained by establishing a sales force, marketing and
distribution infrastructure or, alternatively, collaborating with a commercialization partner;

negotiating favorable terms in any collaboration, licensing or other arrangements into which we or our licensees and collaborators may enter
and performing our obligations in such collaborations;

qualifying for adequate coverage and reimbursement by government and third-party payors for product candidates;

maintaining and enhancing a sustainable, scalable, reproducible and transferable manufacturing process for our vectors and product
candidates;

establishing and maintaining supply and manufacturing relationships with third parties that can provide adequate, in both amount and quality,
products and services to support clinical development and the market demand for product candidates, if approved;

obtaining market acceptance of product candidates as a viable treatment option;

competing effectively when other companies may develop products that are priced lower, reimbursed more favorably by government or other
third-party payors, safer, more effective or more convenient to use than our products, if any, or our licensees’ and collaborators’ products;

implementing additional internal systems and infrastructure, as needed;

negotiating favorable terms in any collaboration, licensing or other arrangements into which we may enter and performing our obligations in
such collaborations;

maintaining, protecting and expanding our portfolio of intellectual property rights, including patents, trade secrets and know-how;

avoiding and defending against third-party interference, infringement and other intellectual property related claims; and

attracting, hiring and retaining qualified personnel.

Many of these factors as they relate to our licensees’ and collaborators’ products, including Zolgensma, will be outside our control, and future

revenues in connection with sales of such products may be precluded or limited by any of these factors. Under our Collaboration and License Agreement
with AbbVie, we will have limited influence and control over the RGX-314 development and commercialization activities of AbbVie in markets outside the
United States, and future revenues in connection with sales of licensed products under such agreement may be precluded or limited by any of these factors.

Even if one or more of the product candidates that we develop is approved for commercial sale, we anticipate incurring significant costs associated
with commercializing any approved product candidate. Our expenses could increase beyond expectations if we are required by the FDA, the EMA or other
regulatory authorities to perform clinical and other studies in addition to those that we currently anticipate. Even if we are able to generate revenues from
sales of any of our product candidates or in connection with sales of any of our licensees’ or collaborators’ products, we may not become profitable and
may need to obtain additional funding to continue operations.

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Risks Related to Third Parties

We rely on third parties to conduct certain preclinical research and development activities and aspects of our clinical trials. If these third parties do not
meet our deadlines or otherwise conduct the preclinical research and development activities and trials as required, our preclinical and clinical
development programs could be delayed or unsuccessful.

We do not have the ability to conduct all aspects of our preclinical research and development activities or clinical trials ourselves. We are dependent
on third parties to conduct certain aspects of our clinical trials and, therefore, the timing of the initiation and completion of these trials may be controlled by
such third parties and may occur on substantially different timing from our estimates. Specifically, we rely on third parties to conduct a portion of our
preclinical research and development activities and we may also rely on CROs, medical institutions, clinical investigators, consultants or other third parties
to conduct our clinical trials in accordance with our clinical protocols and regulatory requirements. A loss or deterioration of our relationships with such
third parties or the principal investigators for our preclinical and clinical programs could materially harm our business.

There is no guarantee that any third party on which we rely for our preclinical research and development activities and the administration and
conduct of our clinical trials will devote adequate time and resources to such activities or trials or perform as contractually required. If any such third party
fails to meet expected deadlines, fails to adhere to our preclinical or clinical protocols or otherwise performs in a substandard manner, our preclinical
programs and clinical trials may be extended, delayed, or terminated, which could materially harm our business. Additionally, if any of our clinical trial
sites terminates for any reason, we may experience the loss of follow-up information on subjects enrolled in our ongoing clinical trials unless we are able to
transfer those subjects to another qualified clinical trial site. Furthermore, principal investigators for our clinical trials may serve as scientific advisors or
consultants to us from time to time and may receive cash or equity compensation in connection with such services. If these relationships and any related
compensation result in perceived or actual conflicts of interest, the integrity of the data generated at the applicable clinical trial site may be jeopardized,
which could result in substantial delays in our clinical trials and materially harm our business.

We have in the past, and in the future may, enter into licensing agreements or collaborations with third parties licensing parts of our NAV Technology
Platform for the development of product candidates. If these licensing arrangements or collaborations are not successful, our business could be
harmed.

We have entered into agreements involving the licensing of parts of our NAV Technology Platform and relating to the development and
commercialization of certain product candidates and plan to enter into additional licensing agreements or collaborations in the future. We have limited
control over the amount and timing of resources that our current and future licensees and collaborators dedicate to the development or commercialization of
product candidates or of products utilizing licensed components of our NAV Technology Platform. Our ability to generate revenues from these
arrangements will depend on our and our licensees’ and collaborators’ abilities to successfully perform the functions assigned to each of us in these
arrangements. In addition, our licensees and collaborators have the ability to abandon research or development projects and terminate applicable
agreements. Moreover, an unsuccessful outcome in any clinical trial for which our licensee or collaborator is responsible could be harmful to the public
perception and prospects of our NAV Technology Platform or product candidates.

Any current or future licensing agreements or future collaborations we enter into may pose additional risks, including the following:

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subjects in clinical trials undertaken by our licensees and collaborators may suffer adverse effects, including death;

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

we may not have access to, or may be restricted from disclosing, certain information regarding product candidates being developed or
commercialized under a collaboration and, consequently, may have limited ability to inform our stockholders about the status of such product
candidates;

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

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

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a licensee or collaborator with marketing and distribution rights to one or more of our product candidates that achieve regulatory approval
may not commit sufficient resources to the marketing and distribution of any such product candidate;

our licensees or collaborators may breach their reporting, payment, intellectual property or other obligations to us, which could prevent us
from complying with our contractual obligations to GSK and Penn;

disagreements with licensees or collaborators, including disagreements over intellectual property and other proprietary rights, payment
obligations, contract interpretation or the preferred course of development of any product candidates, may cause delays or termination of the
research, development or commercialization of such product candidates, may lead to additional responsibilities for us with respect to such
product candidates or may result in litigation or arbitration, any of which would be time-consuming and expensive and could potentially
lessen the value of such agreements and collaborations;

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

disputes may arise with respect to the ownership of our other rights to intellectual property developed pursuant to our licensing agreements or
collaborations;

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

licensing agreements or collaborations may be terminated for the convenience of the licensee or collaborator and, if terminated, we could be
required to raise additional capital to pursue further development or commercialization of the applicable product candidates.

For example, under our Collaboration and License Agreement with AbbVie, we will have limited influence and control over the RGX-314
development and commercialization activities of AbbVie in markets outside the United States. Failure by AbbVie to meet its obligations under our
Collaboration and License Agreement, to apply sufficient efforts at developing and commercializing licensed products, or to comply with applicable legal
or regulatory requirements, may materially adversely affect our business.

If our licensing agreements or collaborations do not result in the successful development and commercialization of products, or if one of our
licensees or collaborators terminates its agreement with us, we may not receive any future milestone or royalty payments, as applicable, under the license
agreement or collaboration. If we do not receive the payments we expect under these agreements, our development of product candidates could be delayed
and we may need additional resources to develop our product candidates. In addition, if one of our licensees or collaborators terminates its agreement with
us, we may find it more difficult to attract new licensees or collaborators and the perception of us in the business and financial communities could be
harmed. Each of our licensees and collaborators is subject to similar risks with respect to product development, regulatory approval and commercialization,
and any such risk could result in its business being harmed, which could adversely affect our collaboration.

We may in the future decide to partner or collaborate with pharmaceutical and biotechnology companies for the development and potential
commercialization of our product candidates. These relationships, or those like them, may require us to incur non-recurring and other charges, increase our
near- and long-term expenditures, issue securities that dilute our existing stockholders or disrupt our management and business. In addition, we could face
significant competition in seeking appropriate collaborators and the negotiation process is time-consuming and complex. Our ability to reach a definitive
licensing agreement or collaboration agreement will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the
terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a variety of factors.

We may not be successful in our efforts to establish such a strategic partnership or other alternative arrangements for our product candidates because

our research and development pipeline may be insufficient, our product candidates may be deemed to be at too early of a stage of development for
collaborative effort or third parties may not view our product candidates as having the requisite potential to demonstrate safety and efficacy or market
opportunity. In addition, we may be restricted under existing collaboration agreements from entering into future agreements with potential collaborators. If
we license rights to product candidates, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate the licensed
product candidates with our existing operations.

If we are unable to reach agreements with suitable licensees or collaborators on a timely basis, on acceptable terms or at all, we may have to curtail
the development of a product candidate, reduce or delay its development program, delay its potential commercialization, reduce the scope of any sales or
marketing activities or increase our expenditures and undertake development or commercialization activities at our own expense. If we elect to fund
development or commercialization activities on our own, we may need to obtain additional expertise and additional capital, which may not be available to
us on acceptable terms or at all.

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Our reliance on third parties requires us to share our trade secrets, which increases the possibility that a competitor will discover them or that our trade
secrets will be misappropriated or disclosed.

Because we rely on third parties, including contractors, to research, develop and manufacture our product candidates, we must, at times, share trade

secrets with them. We seek to protect our proprietary technology in part by entering into confidentiality agreements and, if applicable, material transfer
agreements, consulting agreements or other similar agreements with our advisors, employees, third-party contractors and consultants prior to beginning
research or disclosing proprietary information. These agreements typically limit the rights of the third parties to use or disclose our confidential
information, including our trade secrets. Despite the contractual provisions employed when working with third parties, these provisions may be breached,
and the need to share trade secrets and other confidential information increases the risk that such trade secrets become known by our competitors, are
inadvertently incorporated into the technology of others, or are disclosed or used in violation of these agreements. Given that our proprietary position is
based, in part, on our know-how and trade secrets, a competitor’s independent discovery of our trade secrets or other unauthorized use or disclosure would
impair our competitive position and may materially harm our business.

In addition, these agreements typically restrict the ability of our advisors, employees, third-party contractors and consultants to publish data
potentially relating to our trade secrets, although our agreements may contain certain limited publication rights. For example, any academic institution that
we collaborate with, or may collaborate with in the future, will sometimes be granted rights to publish data arising out of such collaboration, provided that
we are notified in advance and given the opportunity to delay publication for a limited time period in order for us to secure patent protection of intellectual
property rights arising from the collaboration, in addition to the opportunity to remove confidential or trade secret information from any such publication.
We may also conduct joint research and development programs that may require us to share trade secrets under the terms of our research and development
or similar agreements. Despite our efforts to protect our trade secrets, our competitors may discover our trade secrets, either through breach of our
agreements with third parties, independent development or publication of information by any of our third-party collaborators. A competitor’s discovery of
our trade secrets would impair our competitive position and harm our business.

Risks Related to Manufacturing

Products intended for use in gene therapies are novel, complex and difficult to manufacture. We could experience production problems that result in
delays in our development or commercialization programs, limit the supply of our products or otherwise harm our business.

We currently have development, manufacturing and testing agreements with third parties to manufacture supplies of our product candidates, in

addition to our internal manufacturing laboratory. Several factors could cause production interruptions, including equipment malfunctions, facility
contamination, raw material shortages or contamination, a decline in stability of a product that reduces its shelf life, natural disasters, public health crises,
disruption in utility services, human error or disruptions in the operations of suppliers.

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 biologics 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 the product candidate is 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
may not be detected in standard release testing, which could result in lot failures, product recalls, declines in stability, product liability claims or insufficient
inventory. We may encounter problems achieving adequate quantities and quality of clinical-grade materials that meet FDA, EMA or other applicable
foreign standards or specifications with consistent and acceptable production yields and costs.

In addition, the FDA, the EMA and other foreign regulatory authorities may require us to submit samples of any lot of any approved product
together with the protocols showing the results of applicable tests at any time. Under some circumstances, the FDA, the EMA or other foreign regulatory
authorities may require that we not distribute a lot or batch until the competent authority authorizes its release. Slight deviations in the manufacturing
process, including those affecting quality attributes and stability, may result in unacceptable changes in the product that could result in lot/batch failures or
product recalls. Lot/batch failures or product recalls could cause us to delay clinical trials or product launches which could be costly to us and otherwise
harm our business, financial condition, results of operations and prospects.

We also may encounter problems hiring and retaining the experienced scientific, quality control and manufacturing personnel needed to operate our

manufacturing process which could result in delays in our production or difficulties in maintaining compliance with applicable regulatory requirements.

Any problems in our manufacturing process or the facilities with which we contract could make us a less attractive collaborator for potential

partners, including larger pharmaceutical companies and academic research institutions, which could limit our access to

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additional attractive development programs. Problems in third-party manufacturing processes or facilities also could restrict our ability to meet market
demand for our products. Additionally, should our manufacturing agreements with third parties be terminated for any reason, there may be a limited
number of manufacturers who would be suitable replacements and it could take a significant amount of time to transition the manufacturing to a
replacement.

Delays in obtaining regulatory approval of our manufacturing process or disruptions in our manufacturing process, including the development of our
current good manufacturing practice (cGMP) production facility, may delay or disrupt our commercialization efforts.

Before we can begin to commercially manufacture our product candidates in third-party or our own facilities, we must obtain regulatory approval

from the FDA, which includes a review of the manufacturing process and facility. A manufacturing authorization must also be obtained from the
appropriate European Union Member State regulatory authorities and may be required by other foreign regulatory authorities. The timeframe required to
obtain such approval or authorization is uncertain. In order to obtain approval, we will need to ensure that all of our processes, methods and equipment are
compliant with cGMP, and perform extensive audits of vendors, contract laboratories and suppliers. If we or any of our vendors, contract laboratories or
suppliers are found to be out of compliance with cGMP, we may experience delays or disruptions in manufacturing while we work 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 will be 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 would be subject to possible regulatory action, which could result in fines or reputational harm, and we may not be permitted to sell
any products that we may develop.

We currently rely and expect to continue to rely on third parties to conduct our product manufacturing, and these third parties may not perform
satisfactorily.

We currently plan to have some of the material manufactured for our planned preclinical and clinical programs by third parties. We currently rely,

and expect to continue to rely, on third parties for the production of a portion of our preclinical study and planned clinical trial materials and, therefore, we
can control only certain aspects of their activities.

We rely on additional third parties to manufacture ingredients of our product candidates and to perform quality testing, and reliance on these third

parties entails risks to which we would not be subject if we manufactured the product candidates ourselves, including:

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reduced control for certain aspects of manufacturing activities;

termination or nonrenewal of manufacturing and service agreements with third parties in a manner or at a time that is costly or damaging to
us;

disruptions to the operations of our third-party manufacturers and service providers caused by conditions unrelated to our business or
operations, including the bankruptcy of, or legal or regulatory actions against, the manufacturer or service provider;

reduced capacity of our third-party manufacturers and service providers caused by increased demand by their other customers;

discovery of data integrity issues with our third-party manufacturers and service providers which directly or indirectly impact our ability to
use our product candidates; and

legal or regulatory actions against our third-party manufacturers and service providers which adversely affect our ability to use our product
candidates.

FDA, EMA or other regulatory authority action could include injunction, recall, seizure or total or partial suspension of product manufacture or

manufacturing authorization. Any of these events could lead to clinical trial delays or failure to obtain regulatory approval, or impact our ability to
successfully commercialize future product candidates, and therefore may cause our business, financial condition, results of operations and prospects to be
materially harmed.

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Failure to comply with ongoing manufacturing regulatory requirements could cause us to suspend production or put in place costly or time-consuming
remedial measures, and shortages of resources or raw materials could result in delays in our research studies, preclinical and clinical development or
marketing schedules.

Regulatory authorities may, at any time following approval of a product for sale, audit the manufacturing facilities for such product. If any such
inspection or audit identifies a failure to comply with applicable regulations, or if a violation of product specifications or applicable regulations occurs
independent of such an inspection or audit, the relevant regulatory authority may require remedial measures that may be costly or time-consuming to
implement and that may include the temporary or permanent suspension of a clinical trial or commercial sales or the temporary or permanent closure of a
manufacturing facility. Any such remedial measures imposed upon us or any of our third-party manufacturers could materially harm our business, financial
condition, results of operations and prospects.

If we or any of our third party-manufacturers fail to comply with applicable cGMP regulations, 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.

Additionally, if supply from a manufacturing facility is interrupted, there could be a significant disruption in commercial supply of our products. An

alternative manufacturer would need to be qualified, through a supplement to its regulatory filing, which could result in further delay. Regulatory
authorities also may require additional trials if a new manufacturer is relied upon for commercial production. Switching manufacturers may involve
substantial costs and could result in a delay in our desired clinical and commercial timelines.

Given the nature of biologics manufacturing, there is a risk of contamination during manufacturing. Any contamination could materially harm our

ability to produce product candidates on schedule and could harm our results of operations and cause reputational damage.

Some of the resources, raw materials and components required in our manufacturing or research and development processes are derived from
biologic sources, and we normally rely on suppliers to provide such resources, raw materials and components. These may be difficult to procure and subject
to contamination or recall. Certain resources, raw materials and components, especially those that are specifically catered to the gene therapy industry, may
become unavailable to us in sufficient quantities from time to time due to increased demand.

A material shortage, contamination, recall or restriction on the use of biologically derived substances in the manufacture of our product candidates

may be beyond our control and could adversely impact or disrupt the commercial manufacturing or the production of clinical material, which could
materially harm our development timelines and our business, financial condition, results of operations and prospects.

Risks Related to the Commercialization of Our Product Candidates

If we are unable to establish sales and marketing capabilities or enter into agreements with third parties to market and sell our product candidates, if
approved, we may be unable to generate any product revenue.

We currently have no products to sell and therefore no product sales and marketing organization. To successfully commercialize any products that

may result from our development programs, we will need to develop these capabilities, either on our own or with others. The establishment and
development of our own commercial team or the establishment of a contract sales force to market any products we may develop will be expensive and
time-consuming and could delay any product launch. Moreover, we cannot be certain that we will be able to successfully develop this capability. We may
enter into collaborations regarding one or more of our product candidates with other entities to utilize their marketing and distribution capabilities, such as
our collaboration with AbbVie, but we may be unable to enter into such agreements on favorable terms, if at all. If any current licensees or collaborators, or
future licensees or collaborators, do not commit sufficient resources to commercialize our products, 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. We compete with many companies that currently have
extensive, experienced and well-funded marketing and sales operations to recruit, hire, train and retain marketing and sales personnel. We also face
competition in our search for third parties to assist us with the sales and marketing efforts of our product candidates. Without an internal team or the
support of a third party to perform marketing and sales functions, we may be unable to compete successfully against these more established companies.

Our efforts to educate the medical community and third-party payors on the benefits of our product candidates 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 potential
products. If any of our product candidates is approved but fails to achieve market acceptance among physicians, patients or third-party payors, we will not
be able to generate significant revenues from such product, which could materially harm our business, financial condition, results of operations and
prospects.

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If we do not achieve our projected development goals in the timeframes we announce and expect, the commercialization of our products may be
delayed and, as a result, our stock price may decline.

From time to time, we estimate the timing of the accomplishment of various scientific, clinical, regulatory and other product development goals,
which we sometimes refer to as milestones. These milestones may include, but are not limited to, the commencement or completion of scientific studies
and clinical trials, the submission of regulatory filings, the announcement of results from scientific studies or clinical trials and the announcement of
additional product candidates. From time to time, we may publicly announce the expected timing of some of these milestones. All of these milestones are
and will be based on numerous assumptions. The actual timing of these milestones can vary dramatically compared to our estimates, in some cases for
reasons beyond our control. If we do not meet these milestones as publicly announced, or at all, the commercialization of our products may be delayed or
never achieved and, as a result, our stock price may decline.

Even if we receive regulatory approval, we still may not be able to successfully commercialize our lead product candidates or any future product
candidate, and the revenue that we generate from any approved product’s sales, if any, could be limited.

Ethical, social and legal concerns about gene therapy could result in additional regulations restricting or prohibiting our products. From time to time,

public sentiment may be more adverse to commercialization of gene therapy as a therapeutic technique. Even with the requisite approvals from the FDA,
the EMA and other regulatory authorities, the commercial success of our product candidates will depend, in part, on the acceptance of physicians, patients
and health care payors of gene therapy products in general, and our product candidates in particular, as medically necessary, cost-effective and safe. Any
product 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 our product candidates will depend on a number of factors, including:

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demonstration of clinical efficacy and safety compared to other more-established products;

limitation of our targeted patient population and other limitations or warnings contained in any FDA or European Commission labeling, or
other comparable foreign regulatory authority-approved labeling;

acceptance of a new formulation by health care providers and their patients;

the prevalence and severity of any adverse effects;

new procedures or methods of treatment that may be more effective in treating or may reduce the conditions which our products are intended
to treat;

pricing and cost-effectiveness;

the effectiveness of our or any future collaborators’ sales and marketing strategies;

our ability to obtain and maintain sufficient third-party coverage and reimbursement from government health care programs, including
Medicare and Medicaid, private health insurers and other third-party payors;

unfavorable publicity and negative public opinion relating to product candidates or gene therapy generally, including due to serious adverse
events in gene therapy trials; and

the willingness of patients to pay out-of-pocket in the absence of third-party coverage or reimbursement.

If any product candidate is approved but does not achieve an adequate level of acceptance by physicians, hospitals, healthcare payors or patients, we

may not generate sufficient revenue from that product candidate and may not become or remain profitable. Our efforts to educate the medical community
and third-party payors on the benefits of our lead product candidates or any future product candidates may require significant resources and may never be
successful. In addition, our ability to successfully commercialize our product candidates will depend on our ability to differentiate our products from
competing products and defend and enforce our intellectual property rights relating to our products. Additionally, if the market opportunities for our lead
product candidates or any future product candidates are smaller than we believe they are, our product revenues may be harmed and our business may suffer.

We focus our research and product development on treatments for severe genetic and orphan diseases. Our understanding of both the number of

people who have these diseases, as well as the subset of people with these diseases who have the potential to benefit from treatment with our product
candidates, are based on estimates. These estimates may prove to be incorrect and new studies may reduce the estimated incidence or prevalence of these
diseases. The number of patients in the United States, the European Union and elsewhere may turn out to be lower than expected, may not be otherwise
amenable to treatment with our products or patients may become increasingly difficult to identify and access, all of which would harm our business,
financial condition, results of operations and prospects.

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Further, there are several factors that could contribute to making the actual number of patients who receive any products we develop 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, especially in certain degenerative conditions such as the conditions
our lead product candidates are intended to treat, will likely diminish the therapeutic benefit conferred by a gene therapy due to irreversible cell death.
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 insurance coverage and reimbursement status of newly approved products is uncertain. Failure to obtain or maintain adequate coverage and
reimbursement for our products, if approved, could limit our ability to market those products and decrease our ability to generate product revenue.

We expect the cost of a single administration of gene therapy products, such as those we are developing, to be substantial, when and if they achieve
regulatory approval. We expect that coverage and reimbursement by government and private payors will be essential for most patients to be able to afford
these treatments. Accordingly, sales of our product candidates will depend substantially, both domestically and abroad, on the extent to which the prices of
our 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. Even if coverage is provided, 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 products, including potential one-time gene
therapies. 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 the Centers for
Medicare & Medicaid Services (CMS), the agency responsible for administering the Medicare program, 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. We
cannot be assured that Medicare or Medicaid will cover any of our products, if approved, or provide reimbursement at adequate levels to realize a sufficient
return on our investment. In addition, government regulators and legislative bodies in the United States are considering numerous proposals that may result
in limitations on the prices at which we could charge customers for our products if we have products that are approved for sale. At this time, we are unable
to predict how these potential legislative changes might affect our business. Moreover, reimbursement agencies in the European Union may be more
conservative than CMS. 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 countries 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 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 products may be reduced
compared with the reimbursement in the United States and may be insufficient to generate commercially reasonable product revenues.

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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, and the existing data for
reimbursement based on some of these metrics is limited. Therefore, it may be difficult to project the impact of these evolving reimbursement metrics on
the willingness of payors to cover candidate products that we or our partners 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 and additional legislative changes.

Additionally, our lead product candidates are designed to provide therapeutic benefit after a single administration and, therefore, the pricing and

reimbursement of a single administration of our lead product candidates, if approved, must be adequate to support our commercial infrastructure. 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. If we are unable to obtain adequate levels of reimbursement, our ability to
successfully market and sell our product candidates will be harmed. The manner and level at which reimbursement is provided for services related to our
product candidates (e.g., for administration of our product to patients) is also important. Inadequate reimbursement for such services may lead to physician
resistance and limit our ability to market or sell our products.

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

We expect that coverage and reimbursement of drugs and biologics may be increasingly restricted 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. In particular, pricing by biopharmaceutical 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 health care reforms and cost reductions of drugs and biologics. A number of federal and state proposals to
control the cost of health care have been made in the United States. Specifically, there have been several recent U.S. Congressional inquiries and proposed
federal and state bills designed to, among other things, bring more transparency to pricing, review the relationship between pricing and manufacturer
patient programs and reform government program reimbursement methodologies. In some international markets, the government controls drug and biologic
pricing, which can affect profitability.

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 and biologics generally could
restrict the amount that we are able to charge for our future products, if any, which could adversely affect our revenue and results of operations.

Risks Related to Our Business Operations

We may not be successful in our efforts to identify or discover additional product candidates and 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.

The success of our business depends upon our ability to identify, develop and commercialize product candidates based on our NAV Technology
Platform. Research programs to identify new product candidates require substantial technical, financial and human resources. Although certain of our product
candidates are currently in research studies or preclinical development, we may fail to identify potential product candidates for clinical development for several
reasons. For example, our research may be unsuccessful in identifying potential product candidates or our potential product candidates may be shown to have
harmful side effects, may be commercially impracticable to manufacture or may have other characteristics that may make the products unmarketable or
unlikely to receive marketing approval.

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 greater commercial potential. 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 materially harm our business, financial condition, results of operations and prospects.

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

We are highly dependent on members of our executive team, the loss of any of whose services may adversely impact the achievement of our
objectives. While we have entered into employment agreements with each of our executive officers, any of them could leave our employment at any time,
as all of our employees are “at will” employees. We currently do not have “key person” insurance on any of our employees. The loss of the services of one
or more of our current employees, consultants and advisors might impede the achievement of our research, development, licensing and commercialization
objectives.

Recruiting and retaining other qualified employees, consultants and advisors for our business, including scientific and technical personnel is, and

will continue to be, critical to our success. There currently is a shortage of skilled individuals with substantial gene therapy experience, which we believe is
likely to continue. As a result, 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 studies 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 any of our key executives, employees, consultants or advisors may impede the progress of our research, development, licensing and
commercialization objectives and materially harm our business, financial condition, results of operations and prospects.

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 and licensing activities and, in the longer term, build a sales and marketing
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. It is likely that our management, finance, development personnel, systems and facilities currently in place may
not be adequate to support this 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 sufficient 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.

If our employees, principal investigators, consultants or commercial partners engage in misconduct, or if we are unable to comply with federal and
state healthcare fraud and abuse laws, false claims laws, health information privacy and security laws or other applicable laws or regulations, then we
could face substantial penalties.

We are exposed to the risk of fraud or other misconduct by our employees, principal investigators, consultants and commercial partners. Misconduct

by these parties could include intentional failures to comply with FDA regulations or the regulations applicable in the European Union and other
jurisdictions, provide accurate information to the FDA, the European Commission 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. In particular,
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. Such misconduct also could involve the improper use of
information obtained in the course of clinical trials or interactions with the FDA or other regulatory authorities, which could result in regulatory sanctions
and cause serious harm to our reputation. We have adopted a code of business conduct applicable to all of our employees, but 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 or
other sanctions.

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If we obtain the approval of the FDA, the European Commission or other regulatory authorities for any of our product candidates and begin

commercializing those products in the United States or outside the United States, our operations will be directly, or indirectly through our prescribers,
customers and purchasers, subject to various federal, state and foreign fraud and abuse laws and regulations, including, without limitation, the federal
Health Care Program Anti-Kickback Statute, the federal civil and criminal False Claims Act and Physician Payments Sunshine Act and regulations, and
similar laws in foreign jurisdictions. These laws will impact, among other things, our proposed sales, marketing and educational programs. In addition, we
may be subject to patient privacy laws by both the federal government and the states in which we conduct our business. The laws that will affect our
operations include, but are not limited to:

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the federal Health Care Program 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. Liability may be established
under the federal Anti-Kickback Statute without proving actual knowledge of the 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. PPACA provides and recent government cases against pharmaceutical and medical device manufacturers support the
view that federal Anti-Kickback Statute violations and certain marketing practices, including off-label promotion, may implicate the False
Claims Act;

the federal Health Insurance Portability and Accountability Act of 1996 (HIPAA), which created new federal criminal statutes that prohibit a
person from knowingly and willfully executing a scheme or from making false or fraudulent statements to defraud any healthcare benefit
program, regardless of the payor (e.g., public or private);

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, Modifications to the HIPAA Privacy, Security, Enforcement, and Breach
Notification Rules Under HITECH and the Genetic Information Nondiscrimination Act;

Other Modifications to HIPAA, which imposes certain requirements relating to the privacy, security and transmission of individually
identifiable health information without appropriate authorization by entities subject to the rule, such as health plans, health care
clearinghouses and health care providers;

federal transparency laws, including the federal Physician Payment Sunshine Act, that require disclosure of payments and other transfers of
value provided to physicians and teaching hospitals, and ownership and investment interests held by physicians and other healthcare
providers and their immediate family members and applicable group purchasing organizations;

national laws, industry codes and professional codes of conduct applicable to certain European Union Member States which require payments
made to physicians to be publicly disclosed and agreements with physicians to often be the subject of prior notification and approval by the
physicians’ employer, his or her competent professional organization and/or the regulatory authorities of the individual Member States;

federal, state and foreign laws relating to the processing, storage and transfer of personal data, including, but not limited to, the California
Consumer Privacy Act and the European Union’s General Data Protection Regulation, which may require us to incur substantial costs or
change our business practices with respect to the treatment of personal data; and

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.

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, reputational harm, public reprimands,
third party actions, such as cease and desist letters or injunctions, and the curtailment or restructuring of our operations, any of which could harm our
ability to operate our business and our results of operations.

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The provision of benefits or advantages to physicians to induce or encourage the prescription, recommendation, endorsement, purchase, supply,

order or use of medicinal products is prohibited in the European Union. The provision of benefits or advantages to physicians is also governed by the
national anti-bribery laws of European Union Member States, such as the UK Bribery Act 2010. Infringement of these laws could result in substantial fines
and imprisonment.

Product liability lawsuits against us could cause us to incur substantial liabilities and could limit licensing of our NAV Technology Platform or
commercialization of any product candidates that we may develop.

We face an inherent risk of product liability exposure related to our licensed NAV Technology Platform and the testing of our product candidates in
clinical trials and may face an even greater risk if products utilizing our NAV Technology Platform are commercialized. If we cannot successfully defend
ourselves against claims that our technology or product candidates caused injuries, we could incur substantial liabilities. Regardless of merit or eventual
outcome, liability claims may result in:

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decreased demand for our technology, including any product candidates that we may develop;

loss of revenue;

substantial monetary awards to trial participants or patients;

significant time and costs to defend the related litigation;

withdrawal of clinical trial participants;

the inability to license our NAV Technology Platform or commercialize any product candidates that we may develop; and

injury to our reputation and significant negative media attention.

Although we maintain product liability insurance coverage, this insurance may not be adequate to cover all liabilities that we may incur. We
anticipate that we will evaluate the need to increase our insurance coverage each time we commence a clinical trial and may from time to time purchase
additional coverage for clinical trials. We may need to increase our product liability insurance coverage if we successfully commercialize any product
candidates. Insurance coverage is increasingly expensive and we may not be able to maintain insurance coverage at a reasonable cost or in an amount
adequate to satisfy any liability that may arise.

If we, our development partners, including our licensees and collaborators, or our third-party manufacturers or suppliers fail to comply with
environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could materially harm the
success of our business.

We, our development partners, including our licensees and collaborators, and our third-party manufacturers and suppliers 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 and radioactive
materials. Our operations and the operations of our development partners and third-party manufacturers and suppliers also produce hazardous waste
products. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from the use of
hazardous materials by us, our development partners or our third-party manufacturers or suppliers, we could be held liable for any resulting damages, and
any liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties.

Although we maintain workers’ compensation insurance for certain costs and expenses we may incur due to work-related injuries to our employees,
this insurance may not provide adequate coverage against potential liabilities. Although we maintain insurance for claims that may be asserted against us in
connection with our storage or disposal of biologic, hazardous or radioactive materials, this insurance may not be adequate to cover all liabilities that we
may incur in connection with such claims.

In addition, we may incur substantial costs in order 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 us or our development partners’, including our
licensees’ and collaborators’, 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 harm our business, financial condition, results of operations and prospects.

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Our internal computer systems, or those of our collaborators or other contractors or consultants, may fail or suffer security breaches, which could
result in a material disruption of our business or financial operations, including our licensing and product development programs.

Our internal computer systems and those of our current and any future collaborators and other contractors or consultants are vulnerable to damage
from computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. While we believe we have not
experienced any system failure, accident or security breach to date that has had a material effect on our business, if such an event were to occur and cause
interruptions in our operations, it could result in a material disruption of our business or financial operations, including our licensing and development
programs. Unauthorized disclosure of sensitive or confidential patient or employee data, including personally identifiable information, whether through
breach of computer systems, systems failure, employee negligence, fraud or misappropriation, or otherwise, or unauthorized access to or through our
information systems and networks, whether by our employees or third parties, could result in negative publicity, legal liability and damage to our
reputation. Unauthorized disclosure of personally identifiable information could also expose us to sanctions for violations of data privacy laws and
regulations around the world, especially since the regulatory environment surrounding data privacy laws are increasingly demanding, with frequent
imposition of new and changing requirements. To the extent that any disruption or security breach results in a loss of, or damage to, our trade secrets, data
or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability, our competitive position could be harmed
and the further licensing of our NAV Technology Platform and development and commercialization of our product candidates could be delayed. For
example, the loss of, or damage to, clinical trial data for any of our product candidates could result in delays in our regulatory approval efforts and
significantly increase our costs to recover or reproduce the data.

Our computer systems or our business partners’ computer systems may be vulnerable to service interruption or destruction, malicious intrusion and

random attack. Security breaches pose a risk that sensitive data, including intellectual property, trade secrets or personal information, may be exposed to
unauthorized persons or to the public. Cyber-attacks are increasing in their frequency, sophistication and intensity, and have become increasingly difficult
to detect. Cyber-attacks could include the deployment of harmful malware, denial-of service, social engineering and other means to affect service
reliability, threaten data confidentiality, integrity and availability and fraudulently obtain funds. Our business partners face similar risks, and a security
breach of their systems could adversely affect our security posture. While we continue to invest in data protection and information technology, including
providing an information security training and compliance program to our employees, there can be no assurance that our efforts will prevent service
interruptions or identify breaches in our systems that could adversely affect our business and operations and/or result in the loss of critical or sensitive
information, which could result in financial, legal, business or reputational harm.

Although we have general liability and cybersecurity insurance coverage, our insurance may not cover all claims, continue to be available on
reasonable terms or be sufficient in amount to cover one or more large claims; additionally, the insurer may disclaim coverage as to any claim. The
successful assertion of one or more large claims against us that exceed or are not covered by our insurance coverage or changes in our insurance policies,
including premium increases or the imposition of large deductible or co-insurance requirements, could materially harm our business, financial condition,
results of operations and prospects.

Our customers are concentrated and therefore the loss of a significant customer may harm our business.

Our current revenues are derived from a concentrated customer base. Our revenues for the years ended December 31, 2021 and 2020 consisted

solely of license and royalty revenue. Two customers accounted for approximately 99% of our total revenues for the year ended December 31, 2021. One
customer accounted for approximately 94% of our total revenues for the year ended December 31, 2020. We expect future license and royalty revenue to be
derived from a limited number of licensees and collaborators. Future license and royalty revenue is uncertain due to the contingent nature of our licenses
granted to third-parties.

Risks Related to Our Intellectual Property

Our rights to license our NAV Technology Platform and to develop and commercialize our product candidates are subject, in part, to the terms and
conditions of licenses granted to us by others.

We are heavily reliant upon licenses to certain patent rights and proprietary technology from third parties that are important or necessary to the

development of our technology and products, including technology related to our manufacturing process and our gene therapy product candidates. These
and other licenses may not provide exclusive rights to use such intellectual property and technology in all relevant fields of use and in all territories in
which we may wish to license our platform or develop or commercialize our technology and products in the future. As a result, we may not be able to
prevent competitors from developing and commercializing competitive products in territories not included in all of our licenses. For example, under our
license agreement with GSK, GSK retained certain exclusive and non-exclusive rights under the patent rights that it licensed from Penn.

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Licenses to additional third-party technology that may be required for our licensing or development programs may not be available in the future or

may not be available on commercially reasonable terms, or at all, which could materially harm our business and financial condition.

In some circumstances, we may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain or enforce

the patents, covering technology that we license from third parties. For example, under our license agreement with Penn, Penn is entitled to control the
preparation, prosecution and maintenance of the patent rights licensed to us. However, if we determine that we desire a greater degree of control over such
patent rights, the Penn license agreement provides that Penn will work in good faith with us to enter into an arrangement for such additional control with
reimbursement by us of certain expenses. If our licensors fail to maintain such patents, or lose rights to those patents or patent applications, the rights we
have licensed may be reduced or eliminated and our right to develop and commercialize any of our products that are the subject of such licensed rights
could be impacted. In addition to the foregoing, the risks associated with patent rights that we license from third parties will also apply to patent rights we
may own in the future.

Furthermore, the research resulting in certain of our licensed patent rights and technology was funded by the U.S. government. As a result, the
government may have certain rights, or march-in rights, to such patent rights and technology. When new technologies are developed with government
funding, the government generally obtains certain rights in any resulting patents, including a non-exclusive license authorizing the government to use the
invention for non-commercial purposes. These rights may permit the government to disclose our confidential information to third parties and to exercise
march-in rights to use or allow third parties to use our licensed technology. The government can exercise its march-in rights if it determines that action is
necessary because we fail to achieve practical application of the government-funded technology, because action is necessary to alleviate health or safety
needs, to meet requirements of federal regulations or to give preference to U.S. industry. In addition, our rights in such inventions may be subject to certain
requirements to manufacture products embodying such inventions in the United States. Any exercise by the government of such rights could harm our
competitive position, business, financial condition, results of operations and prospects.

If we are unable to obtain and maintain patent protection for our products and technology, or if the scope of the patent protection obtained is not
sufficiently broad, our competitors could develop and commercialize products and technology similar or identical to ours, and our ability to
successfully license our NAV Technology Platform and commercialize our products and technology may be harmed.

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

proprietary NAV Technology Platform, our product candidates and our manufacturing technology. Our licensors have sought and we intend to seek to
protect our proprietary position by filing patent applications in the United States and abroad related to many of our novel technologies and product
candidates that are important to our business.

The patent prosecution process is expensive, time-consuming and complex, and we may not be able to file, prosecute, maintain, enforce or license

all necessary or desirable patent applications at a reasonable cost or in a timely manner. In addition, certain patents in the field of gene therapy that may
have otherwise potentially provided patent protection for certain of our product candidates have expired or will soon expire. In some cases, the work of
certain academic researchers in the gene therapy field has entered the public domain, which we believe precludes our ability to obtain patent protection for
certain inventions relating to such work. It is also possible that we will fail to identify patentable aspects of our research and development output before it is
too late to obtain patent protection.

We are a party to intellectual property license agreements with GSK and Penn, each of which is important to our business, and other entities and we
expect to enter into additional license agreements in the future. Our existing license agreements impose, and we expect that future license agreements will
impose, various diligence, development and commercialization timelines, milestone payments, royalties and other obligations on us. If we or our licensees
or collaborators fail to comply with our obligations under these agreements, or we are subject to a bankruptcy, the licensor may have the right to terminate
the license, in which event we would not be able to market products covered by the license.

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The patent position of biotechnology and pharmaceutical companies generally is highly uncertain, involves complex legal and factual questions and

has, in recent years, been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights
are highly uncertain. For example, we have filed a complaint for patent infringement against Sarepta Therapeutics, Inc. arising from its use of cultured host
cell technology, which we believe is claimed in a patent we licensed from Penn, to make gene therapy products to treat Duchenne muscular dystrophy and
Limb-girdle muscular dystrophy, among other products. Additionally, we have filed a complaint for patent infringement against Aldevron, LLC arising
from its manufacture of cultured host cells containing certain recombinant nucleic acid molecules, which we believe are protected by another patent we
licensed from Penn. Our litigations against Sarepta and Aldevron will have uncertain outcomes and may not result in the patent enforcement we desire.

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

We may not be aware of all third-party intellectual property rights potentially relating to our technology and product candidates. Publications of

discoveries in the scientific literature often lag the actual discoveries, and patent applications in the United States and other jurisdictions are typically not
published until 18 months after filing or, in some cases, not at all. Therefore, we cannot be certain that we were the first to make the inventions claimed in
any owned or any licensed patents or pending patent applications, or that we were the first to file for patent protection of such inventions.

Even if the patent applications we license or may own in the future do issue as patents, they may not issue in a form that will provide us with any

meaningful protection, prevent competitors or other third parties from competing with us or otherwise provide us with any competitive advantage. Our
competitors or other third parties may avail themselves of safe harbor under the Drug Price Competition and Patent Term Restoration Act of 1984 (the
Hatch-Waxman Amendments) to conduct research and clinical trials and may be able to circumvent our patents by developing similar or alternative
technologies or products in a non-infringing manner.

The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, and our patents may be challenged in the courts or

patent offices in the United States and abroad. Such challenges may result in loss of exclusivity or in patent claims being narrowed, invalidated or held
unenforceable, which could limit our ability to stop others from using or commercializing similar or identical technology and products, or limit the duration
of the patent protection of our technology and product candidates. Given the amount of time required for the development, testing and regulatory review of
new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. As a result, our
intellectual property may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours.

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

The agreements under which we currently license intellectual property or technology from or to third parties, including our Collaboration and
License Agreement with AbbVie, are complex, and certain provisions in such agreements may be susceptible to multiple interpretations. The resolution of
any contract interpretation disagreement that may arise could narrow what we believe to be the scope of our rights to the relevant intellectual property or
technology, increase what we believe to be our financial or other obligations under the relevant agreement, or decrease what we believe to be the financial
or other obligations of our licensee under the relevant agreement, any of which could materially harm our business, financial condition, results of
operations and prospects.

For example, we have received correspondence from GSK and Penn questioning the amount of sublicense fees paid by us in connection with certain

license agreements as well as the applicable Zolgensma royalty rate category under our license agreement with GSK. If the resolution of any potential
dispute over such issues of interpretation is adverse to us, we could owe greater payments to GSK or Penn than we had previously expected, which could
materially harm our financial condition.

We have entered into a royalty purchase agreement (the Purchase Agreement) with entities managed by Healthcare Royalty Management, LLC

(collectively, HCR) providing for the acquisition by HCR of our interest in certain royalty payments based on net sales of Zolgensma. If it is determined
that we owe greater royalty fees to GSK or Penn than we had previously expected based on our interpretation of the applicable license agreements, then
pursuant to the Purchase Agreement, we would be obliged to compensate HCR such that their interest in certain royalty payments based on net sales of
Zolgensma would not be reduced, which could materially harm our financial condition.

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

We have entered into license agreements with third parties and may need to obtain additional licenses from others to advance our research, to
expand our licensing program or to allow commercialization of our product candidates. It is possible that we may be unable to obtain additional licenses at
a reasonable cost or on reasonable terms, if at all. In that event, we may be required to expend significant time and resources to redesign our technology or
product candidates or the methods for manufacturing them or to develop or license replacement technology, all of which may not be feasible on a technical
or commercial basis. If we are unable to do so, we may be unable to redesign our platform technology or to develop or commercialize the affected product
candidates, which could materially harm our business. We cannot provide any assurances that third-party patents do not exist or will not be issued, which
might be enforced against our current platform technology, manufacturing methods, product candidates or future methods or products, resulting in either an
injunction prohibiting our licensing, manufacture or sales, or, with respect to our sales, an obligation on our part to pay royalties and/or other forms of
compensation to third parties.

In many of our existing license agreements, patent prosecution of our licensed technology is controlled primarily by the licensor, and we are
required to reimburse the licensor for certain costs of patent prosecution and maintenance. If our licensors fail to obtain and maintain patent or other
protection for the proprietary intellectual property we license from them, we could lose our rights to the intellectual property or our exclusivity with respect
to those rights, and our competitors could market competing products using the intellectual property. Further, in our license agreements, we could be
responsible for bringing actions against any third party for infringing on the patents we have licensed. Certain of our license agreements in which we are
the licensee also require us to meet development milestones to maintain the license, including establishing a set timeline for developing and
commercializing products and minimum diligence obligations in developing and commercializing the product. Disputes may arise regarding intellectual
property subject to a licensing agreement, including:

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

the extent to which our technology and processes infringe on or otherwise violate intellectual property of the licensor that is not subject to the
licensing agreement;

the sublicensing and corresponding payment obligations of patent and other intellectual property rights under our collaborative development
relationships;

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

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

the priority of invention of patented technology.

If disputes over intellectual property that we have licensed prevent or impair our ability to maintain our current licensing arrangements on

acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

We may not be successful in obtaining necessary rights to our product candidates through acquisitions and in-licenses.

We currently have rights to intellectual property, through licenses from third parties, to develop our product candidates. Because our programs may

require the use of intellectual property or other proprietary rights held by third parties, the growth of our business may depend, in part, on our ability to
acquire, in-license or use such intellectual property and proprietary rights. We may be unable to acquire or in-license any compositions, methods of use,
processes (and patents for such technology) or other intellectual property rights from third parties that we identify as necessary for our technology platform
and product candidates. The licensing or acquisition of third-party intellectual property rights is a competitive area, and several more established companies
may pursue strategies to license or acquire third-party intellectual property rights that we may consider attractive. These established companies may have a
competitive advantage over us due to their size, capital resources and greater clinical development and commercialization capabilities. In addition,
companies that perceive us to be a competitor may be unwilling to license rights to us. We also may be unable to license or acquire third party intellectual
property rights on terms that would allow us to make an appropriate return on our investment.

We sometimes collaborate with non-profit and academic institutions to accelerate our preclinical research or development under written agreements

with these institutions. Some of these institutions may provide us with an option to negotiate a license to any of the institution’s rights in technology
resulting from the collaboration. Regardless of such option, we may be unable to negotiate a license within the specified timeframe or under terms that are
acceptable to us. If we are unable to do so, the institution may offer the intellectual property rights to other parties, potentially blocking our ability to pursue
our program.

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If we are unable to successfully obtain rights to required third-party intellectual property rights or maintain the existing intellectual property rights
we have, we may have to abandon development of the relevant program or product candidate and our business, financial condition, results of operations
and prospects could suffer.

We may not be able to protect our intellectual property rights in the United States and throughout the world.

Filing, prosecuting and defending patents on our platform technology or product candidates in all countries throughout the world would be
prohibitively expensive, and our intellectual property rights in some countries outside the United States could be less extensive than those in the United
States. Although our license agreements with GSK and Penn grant us worldwide rights, certain of our in-licensed U.S. patent rights lack corresponding
foreign patents or patent applications. 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, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our
technologies in jurisdictions where we have not obtained patent protection to develop their own products and, further, may export otherwise infringing
products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our
products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal

systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property
protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of our patents or marketing of
competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in
substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted
narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits
that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our
intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop
or license.

Competitors may infringe our patents or the patents of our licensing partners, or we may be required to defend against claims of infringement or that

our intellectual property is invalid or unenforceable. To counter infringement or unauthorized use claims or to defend against claims of infringement or
other intellectual property related claims can be expensive and time consuming. Even if resolved in our favor, litigation or other legal proceedings relating
to intellectual property claims may cause us to incur significant expenses, and could distract our technical and management personnel from their normal
responsibilities. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments and if
securities analysts or investors perceive these results to be negative, it could materially harm the price of our common stock. Such litigation or proceedings
could substantially increase our operating losses and reduce the resources available for development activities or any future sales, marketing or distribution
activities. We may not have sufficient financial or other resources to adequately conduct such litigation or proceedings. Some of our competitors may be
able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources and more mature and
developed intellectual property portfolios. Uncertainties resulting from the initiation and continuation of patent and other intellectual property litigation or
proceedings could materially harm our ability to compete in the marketplace.

Periodic maintenance fees, renewal fees, annuity fees and various other government fees on patents and/or applications will be due to be paid to the

U.S. Patent and Trademark Office (the USPTO) and various patent agencies outside of the United States over the lifetime of our licensed patents and/or
applications and any patent rights we may own or license in the future. We may rely on our licensing partners to pay these fees due to non-U.S. patent
agencies with respect to our licensed patent rights. The USPTO and various non-U.S. patent agencies require compliance with several procedural,
documentary, fee payment and other similar provisions during the patent application process. We employ reputable law firms and other professionals to
help us comply and we are also dependent on our licensors to take the necessary action to comply with these requirements with respect to our licensed
intellectual property. In many cases, an inadvertent lapse can be cured by payment of a late fee or by other means in accordance with the applicable rules.
There are situations, however, in which non-compliance can result in abandonment or lapse of the patent or patent application, resulting in partial or
complete loss of patent rights in the relevant jurisdiction. In such an event, potential competitors might be able to enter the market and this circumstance
could materially harm our business.

We have registered trademarks with the USPTO, including for the marks “AAVIATE,” “NAV” and “REGENXBIO,” as well as for the
REGENXBIO logos. Our trademarks or trade names 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 we

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need to build 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. In addition, there could be
potential trade name or trademark infringement claims brought by owners of other registered trademarks or trademarks 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 harmed. Our efforts to enforce or protect our proprietary rights related to
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 harm our financial condition or results of operations.

Issued patents covering our NAV Technology Platform or our product candidates could be found invalid or unenforceable if challenged in court. We
may not be able to protect our trade secrets in court.

If one of our licensing partners or we initiate legal proceedings against a third party to enforce a patent covering our NAV Technology Platform or

one of our product candidates, the defendant could counterclaim that the patent covering our product candidate is invalid or unenforceable. In patent
litigation in the United States, defendant counterclaims alleging invalidity or unenforceability are commonplace. Grounds for a validity challenge could be
an alleged failure to meet any of several statutory requirements, including subject-matter eligibility, novelty, non-obviousness, written description or
enablement. Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld information
material to patentability from the USPTO, or made a misleading statement, during prosecution. Third parties also may raise similar claims before
administrative bodies in the United States or abroad, even outside the context of litigation. Such mechanisms include re-examination, post grant review,
inter partes review and equivalent proceedings in foreign jurisdictions. Such proceedings could result in the revocation or cancellation of or amendment to
our patents in such a way that they no longer cover our NAV Technology Platform or our product candidates. The outcome following legal assertions of
invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior
art, of which the patent examiner and we or our licensing partners were unaware during prosecution. If a defendant were to prevail on a legal assertion of
invalidity or unenforceability, we could lose at least part, and perhaps all, of the patent protection on one or more of our product candidates. Such a loss of
patent protection could materially harm our business.

In addition to the protection afforded by patents, we rely on trade secret protection and confidentiality agreements to protect proprietary know-how

that is not patentable or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our technology, product
candidate discovery and development processes that involve proprietary know-how, information or technology that is not covered by patents. However,
trade secrets can be difficult to protect and some courts inside and outside the United States are less willing or unwilling to protect trade secrets. We seek to
protect our proprietary technology and processes, in part, by entering into confidentiality agreements with our employees, consultants, scientific advisors
and contractors. We cannot guarantee that we have entered into such agreements with each party that may have or have had access to our trade secrets or
proprietary technology and processes. We also seek to preserve the integrity and confidentiality of our data and trade secrets by maintaining physical
security of our premises and physical and electronic security of our information technology systems. While we have confidence in these individuals,
organizations and systems, agreements or security measures may be breached, and we may not have adequate remedies for any breach. In addition, our
trade secrets may otherwise become known or be independently discovered by competitors.

Third parties may initiate legal proceedings alleging that we are infringing their intellectual property rights, the outcome of which would be uncertain
and could materially harm our business.

Our commercial success depends, in part, upon our ability to license our NAV Technology Platform, and upon our ability and our licensees’ and

collaborators’ ability to develop, manufacture, market and sell products and use our proprietary technologies without infringing or otherwise violating the
proprietary rights and intellectual property of third parties. The biotechnology and pharmaceutical industries are characterized by extensive and complex
litigation regarding patents and other intellectual property rights. We may in the future become party to, or be threatened with, adversarial proceedings or
litigation regarding intellectual property rights with respect to our product candidates and technology, including interference proceedings, post grant review
and inter partes review before the USPTO. Third parties may assert infringement claims against us based on existing patents or patents that may be granted
in the future, regardless of their merit. There is a risk that third parties may choose to engage in litigation with us to enforce or to otherwise assert their
patent 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 harm our ability to license our technology platform or commercialize our lead product candidates
or any future product candidates or technologies covered by the asserted third-party patents. 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

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such U.S. patent. If we are found to infringe a third party’s valid and enforceable intellectual property rights, we could be required to obtain a license from
such third party to continue licensing, developing, manufacturing and marketing our product candidates and technology. However, we may not be able to
obtain any required license on commercially reasonable terms or at all. Even if we were able to obtain a license, it could be non-exclusive, thereby giving
our competitors and other third parties access to the same technologies licensed to us, and it could require us to make substantial licensing and royalty
payments. We could be forced, including by court order, to cease licensing, developing, manufacturing and commercializing the infringing technology or
product candidates. In addition, we could be found liable for monetary damages, including treble damages and attorneys’ fees, if we are found to have
willfully infringed a patent or other intellectual property right. A finding of infringement could prevent us from licensing our technology platform or
manufacturing and commercializing our product candidates or force us to cease some of our business operations, which could materially harm our business.
Claims that we have misappropriated the confidential information or trade secrets of third parties could similarly harm our business, financial condition,
results of operations and prospects.

We may be subject to claims asserting that our employees, consultants or advisors have wrongfully used or disclosed alleged trade secrets of their
current or former employers or claims asserting ownership of what we regard as our own intellectual property.

Many of our employees, consultants or advisors are currently, or were previously, employed at universities or other biotechnology or pharmaceutical

companies, including our competitors or potential competitors. Although we try to ensure that our employees, consultants 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 any such individual’s current or former employer. Litigation may be
necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable
intellectual property rights or personnel. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a
distraction to management.

In addition, while it is our policy to require our employees and contractors who may be involved in the conception or development of intellectual

property to execute agreements assigning such intellectual property to us, we may be unsuccessful in executing such an agreement with each party who, in
fact, conceives or develops intellectual property that we regard as our own. The assignment of intellectual property rights may not be self-executing or the
assignment agreements may be breached, and we may be forced to bring claims against third parties, or defend claims that they may bring against us, to
determine the ownership of what we regard as our intellectual property.

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

The patent positions of companies engaged in the development and commercialization of biologics and pharmaceuticals are particularly uncertain.

Two cases involving diagnostic method claims and “gene patents” have recently been decided by the Supreme Court. On March 20, 2012, the Supreme
Court issued a decision in Mayo Collaborative Services v. Prometheus Laboratories, Inc. (Prometheus), a case involving patent claims directed to a process
of measuring a metabolic product in a patient to optimize a drug dosage for the patient. According to the Supreme Court, the addition of well-understood,
routine or conventional activity such as “administering” or “determining” steps was not enough to transform an otherwise patent-ineligible natural
phenomenon into patent-eligible subject matter. On June 13, 2013, the Supreme Court issued its decision in Association for Molecular Pathology v. Myriad
Genetics, Inc. (Myriad), a case involving patent claims held by Myriad relating to the breast cancer susceptibility genes BRCA1 and BRCA2. Myriad held
that an isolated segment of naturally occurring DNA, such as the DNA constituting the BRCA1 and BRCA2 genes, is not patent eligible subject matter, but
that complementary DNA, which is an artificial construct that may be created from RNA transcripts of genes, may be patent eligible.

The USPTO has issued a number of guidance memoranda and updates to instruct USPTO examiners on the ramifications of the Prometheus, Myriad
and other court rulings and the application of the rulings to natural products and principles including all naturally occurring nucleic acids. USPTO guidance
may be further updated in view of developments in the case law and in response to public feedback. Patents for certain of our product candidates contain
claims related to specific DNA sequences that are naturally occurring and, therefore, could be the subject of future challenges made by third parties. In
addition, USPTO guidance or changes in guidance or procedures issued by the USPTO could make it impossible for us to pursue similar patent claims in
patent applications we may prosecute in the future.

We cannot assure you that our efforts to seek patent protection for our technology and products will not be negatively impacted by the decisions

described above, rulings in other cases or changes in guidance or procedures issued by the USPTO. We cannot fully predict what ongoing impact the
Supreme Court’s decisions in Prometheus and Myriad may have on the ability of life science companies to obtain or enforce patents relating to their
products and technologies in the future. These decisions, the guidance issued by the USPTO and rulings in other cases or changes in USPTO guidance or
procedures could materially harm our existing patent portfolio and our ability to protect and enforce our intellectual property in the future.

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Moreover, although the Supreme Court has held in Myriad that isolated segments of naturally occurring DNA are not patent-eligible subject matter,

certain third parties could allege that activities that we may undertake infringe other gene-related patent claims, and we may deem it necessary to defend
ourselves against these claims by asserting non-infringement and/or invalidity positions, or paying to obtain a license to these claims. In any of the
foregoing or in other situations involving third-party intellectual property rights, if we are unsuccessful in defending against claims of patent infringement,
we could be forced to pay damages or be subjected to an injunction that would prevent us from utilizing the patented subject matter. Such outcomes could
harm our business, financial condition, results of operations or prospects.

If we do not obtain patent term extension and data exclusivity for our product candidates, our business may be materially harmed.

Depending upon the timing, duration and specifics of any FDA marketing approval of our product candidates, one or more of our U.S. patents may
be eligible for limited patent term extension under the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent extension term of
up to five years as compensation for patent term lost during the FDA regulatory review process. A patent term extension cannot extend the remaining term
of a patent beyond a total of 14 years from the date of product approval, only one patent may be extended and only those claims covering the approved
drug, a method for using it or a method for manufacturing it may be extended. However, we may not be granted an extension because of, for example,
failing to exercise due diligence during the testing phase or regulatory review process, failing to apply within applicable deadlines, failing to apply prior to
expiration of relevant patents or otherwise failing to satisfy applicable requirements. Moreover, the applicable time period or the scope of patent protection
afforded could be less than we request. If we are unable to obtain patent term extension or the term of any such extension is less than we request, our
competitors may obtain approval of competing products following our patent expiration, and our revenue could be reduced, possibly materially.

Risks Related to Ownership of Our Common Stock

Our operating results may fluctuate substantially, which makes our future operating results difficult to predict and could cause the price of our
common stock to fluctuate substantially.

We expect our operating results to be subject to fluctuations. Our net income or loss and other operating results may be affected by numerous

factors, including:

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any variations in the level of expenses related to our NAV Technology Platform, lead product candidates or future product candidates and
technologies;

the addition or termination of any clinical trials and the timing and outcomes of clinical trials;

any regulatory or clinical developments affecting our lead product candidates, any future product candidates or our licensees’ product
candidates;

our execution of any collaborative, licensing or similar arrangements and the timing of any payments we may make or receive under these
arrangements;

changes in the competitive landscape of our industry, including consolidation among our competitors or partners;

the nature and terms of any stock-based compensation grants;

any intellectual property infringement lawsuits in which we may become involved;

our ability to adequately support future growth;

potential unforeseen business disruptions that increase our costs or expenses;

future accounting pronouncements or changes in our accounting policies; and

the changing and volatile global economic environment.

The cumulative effect of these factors could result in large fluctuations and unpredictability in our quarterly and annual operating results. As a result,
we believe that comparing our operating results on a period-to-period basis is not necessarily meaningful. Investors should not rely on our past results as an
indication of our future performance. This variability and unpredictability could also result in our failing to meet the expectations of securities or industry
analysts or investors for any period. If our operating results fall below the expectations of investors or analysts, the price of our common stock could
decline substantially. Furthermore, any quarterly or annual fluctuations in our operating results may, in turn, cause the price of our stock to fluctuate
substantially. Such a stock price decline could occur even when we have met any previously publicly stated revenue or earnings guidance we have
provided.

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Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish proprietary rights.

We have raised significant capital through public offerings of our common stock in order to fund our operations, which has caused dilution to our

stockholders. We may seek to raise additional capital through public or private equity offerings, debt financings, strategic partnerships, licensing
arrangements or other means. To the extent that we raise additional capital by issuing equity securities, the share ownership of existing stockholders will be
diluted. Any future debt financing may involve covenants that restrict our operations, including limitations on our ability to incur liens or additional debt,
pay dividends, redeem our stock, make certain investments or engage in certain merger, consolidation, or asset sale transactions. In addition, if we seek
funds through arrangements with collaborative partners, these arrangements may require us to relinquish rights to some of our technologies or products or
otherwise agree to terms unfavorable to us.

If we engage in future acquisitions or strategic partnerships, this may increase our capital requirements, dilute our stockholders, cause us to incur debt
or assume contingent liabilities and subject us to other risks.

We may evaluate various acquisitions and strategic partnerships, including licensing or acquiring complementary products, intellectual property

rights, technologies, or businesses. Any potential acquisition or strategic partnership may entail numerous risks, including:

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increased operating expenses and cash requirements;

the assumption of additional indebtedness or contingent liabilities;

the issuance of our equity securities;

assimilation of operations, intellectual property and products of an acquired company, including difficulties associated with integrating new
personnel;

the diversion of our management's attention from our existing product programs and initiatives in pursuing such a strategic merger or
acquisition;

retention of key employees, the loss of key personnel, and uncertainties in our ability to maintain key business relationships;

risks and uncertainties associated with the other party to such a transaction, including the prospects of that party and their existing products or
product candidates and regulatory approvals; and

our inability to generate revenue from acquired technology and/or products sufficient to meet our objectives in undertaking the acquisition or
even to offset the associated acquisition and maintenance costs.

In addition, if we undertake acquisitions, we may issue dilutive securities, assume or incur debt obligations, incur large one-time expenses and

acquire intangible assets that could result in significant future amortization expense. Moreover, we may not be able to locate suitable acquisition
opportunities and this inability could impair our ability to grow or obtain access to technology or products that may be important to the development of our
business.

Provisions in our restated certificate of incorporation and amended and restated bylaws and under Delaware law might discourage, delay or prevent a
change in control of our company or changes in our board of directors and, therefore, depress our stock price.

Our restated certificate of incorporation and amended and restated bylaws contain provisions that could depress the market price of our common

stock by acting to discourage, delay or prevent a change in control of our company or changes in our board of directors that the stockholders of our
company may deem advantageous. Among other things, these provisions:

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

permit the board of directors to establish the number of directors;

provide that directors may only be removed “for cause”;

require super-majority voting to amend some provisions in our restated certificate of incorporation and amended and restated bylaws;

authorize the issuance of “blank check” preferred stock that our board of directors could use to implement a stockholder rights plan;

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eliminate the ability of our stockholders to call special meetings of stockholders;

prohibit stockholder action by written consent, which requires all stockholder actions to be taken at a meeting of our stockholders;

provide that the board of directors is expressly authorized to make, alter or repeal our bylaws; and

establish advance notice requirements for nominations for election to our board of directors or for proposing matters that can be acted upon
by stockholders at annual stockholder meetings.

In addition, Section 203 of the Delaware General Corporation Law may discourage, delay or prevent a change in control of our company.
Section 203 imposes certain restrictions on merger, business combinations and other transactions between us and holders of 15% or more of our common
stock.

Our restated certificate of incorporation includes exclusive forum clauses for certain litigation that may be initiated by our stockholders, which could
limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers or employees.

Pursuant to our restated certificate of incorporation, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of

the State of Delaware (or, if the Court of Chancery does not have jurisdiction, the federal district court for the District of Delaware), will be the sole and
exclusive forum for (1) any derivative action or proceeding brought on our behalf, (2) any action asserting a claim of breach of a fiduciary duty owed by
any of our directors, officers or other employees to us or our stockholders, (3) any action asserting a claim arising pursuant to any provision of the
Delaware General Corporation Law, our restated certificate of incorporation or our amended and restated bylaws or (4) any action asserting a claim
governed by the internal affairs doctrine. Additionally, if the subject matter of any action within the scope of the preceding sentence is filed in a court other
than a court located with the State of Delaware (a Foreign Action) in the name of any stockholder, such stockholder shall be deemed to have consented to
(i) the personal jurisdiction of the state and federal courts located within the State of Delaware in connection with any action brought in any such court to
enforce the preceding sentence and (ii) having service of process made upon such stockholder in any such action by service upon such stockholder’s
counsel in the Foreign Action as agent for such stockholder.

Additionally, our restated certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the federal

district courts of the United States of America shall, to the fullest extent permitted by law, be the exclusive forum for the resolution of any complaint
asserting a cause of action arising under the Securities Act of 1933, as amended. Any person or entity purchasing or otherwise acquiring any interest in any
of our securities shall be deemed to have notice of and consented to this provision.

The forum selection clauses in our restated certificate of incorporation may limit our stockholders’ ability to obtain a favorable judicial forum for
disputes with us, our directors, officers or other employees. Alternatively, if a court were to find the choice of forum provisions contained in our restated
certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other
jurisdictions, which could adversely affect our business and financial condition.

Our business could be negatively affected as a result of the actions of activist stockholders.

Proxy contests have been waged against many companies in the biopharmaceutical industry over the last several years, and proxy advisory firms

may recommend changes to our business operations, provisions in our restated certificate of incorporation or amended and restated bylaws, or the
composition of our board of directors or its committees. If faced with a proxy contest or other type of stockholder activism, or a proxy advisory firm
recommendation that is adverse to a management proposal, we may not be able to respond successfully to the contest or dispute, which could be disruptive
to our business. Even if we are successful, our business could be adversely affected by such a contest or dispute involving us or our partners because:

•

•

•

responding to proxy contests or other actions by activist stockholders, or adverse proxy advisory firm recommendations, can be costly and
time-consuming, disrupting operations and diverting the attention of management and employees;

perceived uncertainties as to future direction may result in the loss of potential acquisitions, collaborations or licensing opportunities, and
may make it more difficult to attract and retain qualified personnel and business partners; and

if individuals are elected to our board of directors with a specific agenda, it may adversely affect our ability to effectively and timely
implement our strategic plan and create additional value for our stockholders.

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These actions could cause our stock price to decrease and experience periods of increased volatility.

ITEM 1B.

UNRESOLVED STAFF COMMENTS

None.

ITEM 2.

PROPERTIES

During 2021 we moved into a new facility in Rockville, Maryland which now serves as our corporate, research and manufacturing headquarters. We

occupy approximately 186,000 square feet of office, laboratory and manufacturing space at this location under a lease that expires in September 2036,
subject to certain extension and termination options that we hold under the lease agreement. Construction of the manufacturing portion of the facility is
currently ongoing and the facility is expected to be completed and operational in the first half of 2022.

We also occupy approximately 50,000 square feet of office and laboratory space at other locations in Rockville, Maryland, and approximately

10,000 square feet of office space in New York, New York, under leases that expire at various dates through 2027, some of which are renewable for
additional years.

We believe that our facilities are adequate to meet our operating needs for the foreseeable future.

ITEM 3.

LEGAL PROCEEDINGS

For information regarding our legal proceedings with Abeona Therapeutics Inc., please refer to Note 10, “License and Collaboration Agreements—

License and Royalty Revenue—Abeona Therapeutics Inc.,” to the accompanying consolidated financial statements.

ITEM 4.

MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5.

MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF
EQUITY SECURITIES

Market Information

Our common stock is traded on The Nasdaq Global Select Market under the symbol “RGNX.”

Stock Performance Graph

The graph set forth below compares the cumulative total stockholder return on our common stock between December 31, 2016 and December 31,

2021, with the cumulative total return of (a) the Nasdaq Composite Index and (b) the Nasdaq Biotechnology Index, over the same period. The figures
below assume an investment of $100 in our common stock, the Nasdaq Composite Index and the Nasdaq Biotechnology Index at the closing price on
December 31, 2016 and assumes the reinvestment of dividends, if any.

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. Information used in the graph was
obtained from the Nasdaq Stock Market LLC, a financial data provider and a source believed to be reliable. The Nasdaq Stock Market LLC is not
responsible for any errors or omissions in such information.

The following performance graph and related information shall not be deemed "soliciting material" or to be "filed" with the SEC, nor shall such

information be incorporated by reference into any future filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, each as amended,
except to the extent that we specifically incorporate it by reference into such filing.

$100 investment in stock or index

December 31, 2016  

December 31, 2017  

December 31, 2018  

December 31, 2019  

December 31, 2020  

December 31, 2021

REGENXBIO Inc.
NASDAQ Composite
NASDAQ Biotechnology

  $
  $
  $

100    $
100    $
100    $

179    $
130    $
122    $

63

226    $
126    $
111    $

221    $
172    $
139    $

245    $
250    $
175    $

176 
305 
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Holders

As of February 24, 2022, there were five holders of record of our common stock. The actual number of stockholders is greater than this number of
record holders, as stockholders who are beneficial owners of our common stock hold such shares in street name through brokers and other nominees that
are record holders of our common stock.

Dividends

We have not declared or paid any cash dividends on our common stock since our inception. We do not plan to pay dividends in the foreseeable

future.

ITEM 6.

[RESERVED]

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ITEM 7.

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with the audited financial

statements and the notes thereto included elsewhere in this Annual Report on Form 10-K. In addition, you should read the “Risk Factors” and
“Information Regarding Forward-Looking Statements” sections of this Annual Report on Form 10-K for a discussion of important factors that could cause
actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and
analysis.

For a full discussion and analysis of financial condition and results of operations for the year ended December 31, 2020, including a year-over-year

comparison to the year ended December 31, 2019, please read the “Management's Discussion and Analysis of Financial Condition and Results of
Operations” section of our Annual Report on Form 10-K for the year ended December 31, 2020, which we filed with the SEC on March 1, 2021.

Overview

We are a leading clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy. Our investigational
gene therapies are designed to deliver functional genes to address genetic defects in cells, enabling the production of therapeutic proteins or antibodies that
are intended to impact disease. Through a single administration, gene therapy could potentially alter the course of disease significantly and deliver
improved patient outcomes with long-lasting effects.

Overview of Product Candidates

We have developed a broad pipeline of gene therapy programs using our proprietary adeno-associated virus (AAV) gene therapy delivery platform

(NAV Technology Platform) to address genetic diseases. Our programs and product candidates are described below:

•

•

RGX-314: We are developing RGX-314 in collaboration with AbbVie as a potential one-time treatment for wet age-related macular
degeneration (wet AMD), diabetic retinopathy (DR) and other additional chronic retinal conditions which cause total or partial vision loss.
We are evaluating two separate routes of administration of RGX-314 to the eye: a subretinal delivery procedure as well as a targeted, in-office
administration to the suprachoroidal space. We have licensed certain exclusive rights to the SCS Microinjector® from Clearside Biomedical,
Inc. (Clearside) to deliver gene therapy treatments to the suprachoroidal space of the eye.  

We have initiated two pivotal trials, ATMOSPHERE™ and ASCENT™, for the treatment of wet AMD using RGX-314 delivered
subretinally, and we expect these pivotal trials to support a Biologics Licensing Application (BLA) submission in 2024. ATMOSPHERE and
ASCENT are multi-center, randomized, active-controlled trials to evaluate the efficacy and safety of a single-administration of RGX-314
versus standard of care in patients with wet AMD. Both trials are active and enrolling patients. We initiated the pivotal program using cGMP
material produced from our existing manufacturing process and plan to incorporate our scalable suspension cell culture manufacturing
process to support future commercialization, upon completion of a bridging study.

We are also evaluating the efficacy, safety and tolerability of suprachoroidal delivery of RGX-314 through AAVIATE®, a multi-center, open
label, randomized, controlled, dose-escalation Phase II trial of RGX-314 for the treatment of wet AMD.

RGX-314 is also being evaluated in ALTITUDETM, a multi-center, open label, randomized, controlled, dose-escalation Phase II trial to
evaluate the efficacy, safety and tolerability of RGX-314 for the treatment of DR.

RGX-202: We are developing RGX-202 for the treatment of Duchenne muscular dystrophy (Duchenne), a rare disease caused by mutations
in the gene responsible for making dystrophin, a protein of central importance for muscle cell structure and function. Without dystrophin,
muscles throughout the body degenerate and become weak, eventually leading to loss of movement and independence, required support for
breathing, cardiomyopathy and premature death.

We have received clearance of our Investigational New Drug (IND) application by the U.S. Food and Drug Administration (the FDA) to
evaluate RGX-202 in a first-in-human, Phase I/II clinical trial named AFFINITY DUCHENNETM, which is expected to initiate in the first
half of 2022. This will be a multicenter, open-label dose escalation and dose expansion clinical study to evaluate the safety, tolerability and
clinical efficacy of RGX-202 in patients with Duchenne.

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•

•

•

•

RGX-121: We are developing RGX-121 for the treatment of Mucopolysaccharidosis Type II (MPS II), a rare disease caused by a deficiency
of the IDS gene which encodes I2S, an enzyme that is responsible for the breakdown of structures that dispose of waste products inside cells.

We are conducting a Phase I/II trial of RGX-121 in patients with MPS II under the age of 5 years old to evaluate the safety and tolerability of
RGX-121, as well as the effects of RGX-121 on biomarkers of I2S enzyme activity, neurocognitive development and other clinical measures.

In addition, we are evaluating RGX-121 in a second Phase I/II trial for the treatment of pediatric patients with MPS II ages 5-18 years old to
evaluate the safety of a single administration of RGX-121, the effects of RGX-121 on biomarkers of I2S enzyme activity, and changes in
cognitive function, adaptive behavior, daily function and quality of life.

RGX-111: We are developing RGX-111 for the treatment of Mucopolysaccharidosis Type I (MPS I), a rare disease caused by a deficiency
of IDUA, an enzyme required for the breakdown of structures that dispose of waste products inside cells.

We are conducting a Phase I/II clinical trial in patients with MPS I to evaluate the safety, tolerability and pharmacodynamics of RGX-111,
as well as the effects of RGX-111 on biomarkers of IDUA activity, neurocognitive development and other outcome measures.

RGX-181: We are developing RGX-181 for the treatment of late-infantile neuronal ceroid lipofuscinosis type 2 (CLN2) disease, a form of
Batten disease, caused by mutations in the tripeptidyl peptidase 1 (TPP1) gene.

RGX-381: We are developing RGX-381 for the treatment of the ocular manifestations of CLN2 disease.

Overview of Our NAV Technology Platform

In addition to our internal product development efforts, we also selectively license the NAV Technology Platform to other leading biotechnology and

pharmaceutical companies, which we refer to as NAV Technology Licensees. As of December 31, 2021, our NAV Technology Platform was being applied
in one FDA approved product (Zolgensma®), and the preclinical and clinical development of a number of partnered programs. Licensing the NAV
Technology Platform allows us to maintain our internal product development focus on our core disease indications and therapeutic areas while still
expanding the NAV gene therapy pipeline, developing a greater breadth of treatments for patients, providing additional technological and potential clinical
proof-of-concept for our NAV Technology Platform and creating potential additional revenue.

Impact of COVID-19

We are continuing to actively monitor the impact of the COVID-19 pandemic, including the emergence of variant strains, on our business, results of

operations and financial condition. Our offices, laboratories, clinical trial sites, prospective clinical trial sites, contract research organizations (CROs),
contract manufacturing organizations (CMOs) and other collaborators and partners are located in jurisdictions where quarantines, executive orders, shelter-
in-place orders, guidelines, and other similar orders and restrictions intended to control the spread of the disease have been put in place by governmental
authorities. At certain times during the COVID-19 pandemic, we have implemented a work-from-home policy for all employees who are not essential to be
onsite, and we may take additional actions that alter our operations, as may be required by federal, state or local authorities or which we determine are in
the best interests of our employees.

The COVID-19 pandemic has caused delays to our clinical trials and may further delay or prevent us from proceeding with our clinical trials. Our
other business initiatives, such as preclinical development and manufacturing operations, may also be affected by the COVID-19 pandemic. For example,
the construction of our current good manufacturing practice production facility has been delayed from our original estimates, and may be delayed further,
due to various government orders and restrictions relating to the COVID-19 pandemic. In addition, if the business and operations of our licensees are
adversely affected by the COVID-19 pandemic, our revenues could in turn be adversely affected. We are proactively taking measures to mitigate or reduce
any adverse impact of the COVID-19 pandemic on the progress of our clinical trials and other business initiatives.

Our results of operations for the years ended December 31, 2021 and 2020 were not significantly impacted by the COVID-19 pandemic. However,

the full extent to which the COVID-19 pandemic will directly or indirectly impact our business, results of operations and financial condition in the future is
unknown at this time and will depend on future developments that are highly unpredictable. Please refer to the “Risk Factors” section of this Annual Report
on Form 10-K for further discussion of the risks we face as a result of the COVID-19 pandemic.

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Financial Overview

Revenues

Our revenues to date consist primarily of license and royalty revenue resulting from the licensing of our NAV Technology Platform and other
intellectual property rights. We have not generated any revenues from commercial sales of our own products. If we fail to complete the development of our
product candidates in a timely manner or obtain regulatory approval and adequate labeling, our ability to generate future revenues will be materially
compromised.

We license our NAV Technology Platform and other intellectual property rights to other biotechnology and pharmaceutical companies, including

collaborators for the joint development and commercialization of our product candidates. The terms of the licenses vary, and licenses may be exclusive or
non-exclusive and may be sublicensable by the licensee. Licenses may grant intellectual property rights for purposes of internal and preclinical research
and development only, or may include the rights, or options to obtain future rights, to commercialize drug therapies for specific diseases using the NAV
Technology Platform and other licensed rights. License agreements generally have a term at least equal to the life of the underlying patents, but are
terminable at the option of the licensee. Consideration from licensees under our license agreements may include: (i) up-front and annual fees, (ii) milestone
payments based on the achievement of certain development and sales-based milestones, (iii) sublicense fees, (iv) royalties on sales of licensed products and
(v) other consideration payable upon optional goods and services purchased by licensees.

Future license and royalty revenues are dependent on the successful development and commercialization of licensed products, which is uncertain,

and revenues may fluctuate significantly from period to period. Additionally, we may never receive consideration in our license agreements that is
contemplated on option fees, development and sales-based milestone payments, royalties on sales of licensed products or sublicense fees, given the
contingent nature of these payments. Our revenues are concentrated among a low number of licensees and licenses are terminable at the option of the
licensee. The termination of our licenses by licensees may materially impact the amount of revenue we recognize in future periods. Please refer to Note 2 to
our audited consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K for a description of segment and geographical
information regarding our revenues.

Zolgensma Royalties

Royalty revenue to date consists primarily of royalties on net sales of Zolgensma, which is marketed by Novartis Gene Therapies, Inc. (formerly

AveXis, Inc.) (Novartis Gene Therapies), a wholly owned subsidiary of Novartis AG (Novartis), for the treatment of spinal muscular atrophy (SMA).
Zolgensma is a licensed product under our license agreement with Novartis Gene Therapies for the development and commercialization of treatments for
SMA.

Collaboration and License Agreement with AbbVie

In September 2021, we entered into a collaboration and license agreement with AbbVie Global Enterprises Ltd. (AbbVie), a subsidiary of AbbVie
Inc., to jointly develop and commercialize RGX-314 (the AbbVie Collaboration Agreement). The AbbVie Collaboration Agreement became effective in
November 2021. We recognized license and royalty revenue of $370.0 million under the collaboration during the year ended December 31, 2021, and the
collaboration may materially impact our future revenues, research and development expenses, other operating expenses and operating cash flows associated
with the development and commercialization of RGX-314. For additional information regarding the AbbVie Collaboration Agreement, please refer to Note
10, “License and Collaboration Agreements—AbbVie Global Enterprises Ltd.” to the accompanying audited consolidated financial statements.

Operating Expenses

Our operating expenses consist primarily of cost of revenues, research and development expenses and general and administrative expenses.

Personnel costs including salaries, benefits, bonuses and stock-based compensation expense, comprise a significant component of research and
development and general and administrative expenses. We allocate indirect expenses associated with our facilities, information technology costs,
depreciation and other overhead costs between research and development and general and administrative categories based on employee headcount and the
nature of work performed by each employee.

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Cost of Revenues

Our cost of revenues consists primarily of upstream fees due to our licensors as a result of revenue generated from the licensing of our NAV
Technology Platform and other intellectual property rights, including sublicense fees, milestone payments and royalties on net sales of licensed products.
Sublicense fees are based on a percentage of license fees received by us from licensees and are recognized in the period that the underlying license revenue
is recognized. Milestone payments are payable to licensors upon the achievement of specified milestones by licensees and are recognized in the period the
milestone is achieved or deemed probable of achievement. Royalties are based on a percentage of net sales of licensed products by licensees and are
recognized in the period that the underlying sales occur. Future costs of revenues are uncertain due to the nature of our license agreements and significant
fluctuations in cost of revenues may occur from period to period.

Research and Development Expense

Our research and development expenses consist primarily of:

•

•

•

•

•

•

Salaries, wages and personnel-related costs, including benefits, travel and stock-based compensation, for our scientific personnel performing
research and development activities;

costs related to executing preclinical studies and clinical trials;

costs related to acquiring, developing and manufacturing materials for preclinical studies and clinical trials;

fees paid to consultants and other third-parties who support our product candidate development;

other costs in seeking regulatory approval of our product candidates; and

direct costs and allocated costs related to laboratories and facilities, depreciation expense, information technology and other overhead.

Up-front fees incurred in obtaining technology licenses for research and development activities, as well as associated milestone payments, are

charged to research and development expense as incurred if the technology licensed has no alternative future use.

We plan to increase our research and development expenses for the foreseeable future as we continue development of our product candidates. Our

current and planned research and development activities include the following:

•

Continued development of RGX-314 products under our collaboration with AbbVie, including:

o

o

o

a Phase I/II clinical trial and associated long-term follow-up study to evaluate the safety and efficacy of the subretinal delivery
of RGX-314 for the treatment of wet AMD;

pivotal trials (ATMOSPHERE and ASCENT) to evaluate the safety and efficacy of the subretinal delivery of RGX-314 for the
treatment of wet AMD;

Phase II clinical trials to evaluate the safety and efficacy of the suprachoroidal delivery of RGX-314 using the SCS
Microinjector for the treatment of wet AMD (AAVIATE) and DR (ALTITUDE);

a Phase I/II clinical trial to evaluate the safety and efficacy of RGX-202 for the treatment of Duchenne (AFFINITY DUCHENNE);

Phase I/II clinical trials to evaluate the safety and efficacy of RGX-121 for the treatment of MPS II;

a Phase I/II clinical trial to evaluate the safety and efficacy of RGX-111 for the treatment of MPS I;

preclinical research and development for RGX-181 for the treatment of CLN2 disease, and RGX-381 for the treatment of the ocular
manifestations of CLN2 disease;

preclinical research and development for potential product candidates addressing other diseases across a range of therapeutics areas and other
new technologies;

continued investment in advanced manufacturing analytics and process development activities; and

continued acquisition and manufacture of clinical trial materials in support of our anticipated clinical trials.

•

•

•

•

•

•

•

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The following table summarizes our research and development expenses incurred during the years ended December 31, 2021, 2020 and 2019 (in

thousands):

Direct Expenses

RGX-314
RGX-202
RGX-121 and RGX-111
RGX-181 and RGX-381
Other product candidates
Total direct expenses

Unallocated Expenses

Platform and new technologies
Personnel-related
Facilities and depreciation expense
Other unallocated

Total unallocated expenses
Total research and development

2021

Years Ended December 31,
2020

2019

  $

  $

26,084    $
8,215     
10,795     
1,382     
1,250     
47,726     

35,188     
76,979     
18,918     
2,626     
133,711     
181,437    $

24,083    $
14,073     
13,646     
7,463     
4,674     
63,939     

24,936     
63,531     
12,488     
1,400     
102,355     
166,294    $

20,713 
— 
7,027 
7,602 
4,823 
40,165 

21,083 
50,164 
9,511 
3,262 
84,020 
124,185

Direct expenses related to RGX-202 and RGX-381 were included in platform and new technologies for all periods through December 31, 2019.

Platform and new technologies include direct costs not identifiable with a specific lead product candidate, including costs associated with our research and
development platform used across programs, process development, manufacturing analytics and early research and development for prospective product
candidates and new technologies. We typically utilize our employee and infrastructure resources across our development programs. We do not allocate
personnel and other internal costs, such as facilities and other overhead costs, to specific product candidates or development programs.

General and Administrative Expense

Our general and administrative expenses consist primarily of salaries, wages and personnel-related costs, including benefits, travel and stock-based

compensation, for employees performing functions other than research and development. This includes certain personnel in executive, commercial,
corporate development, finance, legal, human resources, information technology, facilities and administrative support functions. Additionally, general and
administrative expenses include facility-related and overhead costs not otherwise allocated to research and development expense, professional fees for
accounting, legal, commercial and other advisory services, expenses associated with obtaining and maintaining patents, insurance costs, costs of our
information systems and other general corporate activities. We expect that our general and administrative expenses will continue to increase as we continue
to develop, and potentially commercialize, our product candidates.

Other Income (Expense)

Interest Income from Licensing

In accordance with our revenue recognition policy, interest income from licensing consists of imputed interest recognized from significant financing

components identified in our license agreements with NAV Technology Licensees as well as interest income accrued on unpaid balances due from
licensees.

Investment Income

Investment income consists of interest income earned and gains and losses realized from our cash equivalents, marketable securities and non-
marketable equity securities, as well as unrealized gains and losses on marketable equity securities. Cash equivalents are comprised of money market
mutual funds and highly liquid debt securities with original maturities of 90 days or less at acquisition. Marketable securities are comprised of available-
for-sale debt securities and equity securities.

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Interest Expense

Interest expense consists of interest imputed on the liability related to the sale of future Zolgensma royalties to entities managed by Healthcare

Royalty Management, LLC (collectively, HCR). Interest expense is recognized using the effective interest method, based on our estimate of total royalty
payments expected to be received by HCR under the royalty purchase agreement. For further information regarding the royalty purchase agreement with
HCR, please refer to Note 7, “Liability Related to Sale of Future Royalties” to the accompanying audited consolidated financial statements.

Critical Accounting Policies and Estimates

This Management’s Discussion and Analysis of Financial Condition and Results of Operations is based on our consolidated financial statements,

which we have prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The preparation of financial
statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and
expenses and related disclosure of contingent assets and liabilities for the periods presented. We base our estimates on historical experience and on various
other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of
assets and liabilities, and other reported amounts, that are not readily apparent from other sources. Actual results may differ materially from these estimates
under different assumptions or conditions.

Our significant accounting policies are fully described in Note 2 to our audited consolidated financial statements appearing elsewhere in this Annual

Report on Form 10-K. We believe the following accounting policies are critical to the process of making significant judgments and estimates in the
preparation of our financial statements and understanding and evaluating our reported financial results.

Revenue Recognition

We recognize revenue in accordance with Accounting Standards Codification (ASC) 606, Revenue from Contracts with Customers (Topic 606).

Topic 606 requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the
consideration to which the entity expects to be entitled to in exchange for those goods or services. The following five steps are performed to determine the
appropriate revenue recognition for arrangements within the scope of Topic 606: (i) identify the contract(s) with a customer, (ii) identify the performance
obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v)
recognize revenue when (or as) the entity satisfies the performance obligations.

We apply the five-step model to contracts that are within the scope of Topic 606 only when it is probable that we will collect the consideration we

are entitled to in exchange for the goods or services we transfer to the customer. At contract inception, for contracts within the scope of Topic 606, we
assess the goods or services promised within each contract and determine those that are performance obligations and whether each promised good or
service is distinct. We then recognize as revenue the amount of the transaction price that is allocated to respective performance obligations when (or as) the
respective performance obligations are satisfied.

We evaluate our contracts with customers for the presence of significant financing components. If a significant financing component is identified in

a contract and provides a financing benefit to the customer, the transaction price for the contract is adjusted to account for the financing portion of the
arrangement, which is recognized as interest income over the financing term using the effective interest method. In determining the appropriate interest
rates for significant financing components, we evaluate the credit profile of the customer and prevailing market interest rates and select an interest rate in
which we believe would be charged to the customer in a separate financing arrangement over a similar financing term.

License and royalty revenue

We license our NAV Technology Platform and other intellectual property rights to other biotechnology and pharmaceutical companies. The terms of
the licenses vary, and licenses may be exclusive or non-exclusive and may be sublicensable by the licensee. Licenses may grant intellectual property rights
for purposes of internal and preclinical research and development only, or may include the rights, or options to obtain future rights, to commercialize drug
therapies for specific diseases using our NAV Technology Platform and other licensed rights. License agreements generally have a term at least equal to the
life of the underlying patents, but are terminable at the option of the licensee. Consideration payable to us under our license agreements may include: (i) up-
front and annual fees, (ii) milestone payments based on the achievement of certain development and sales-based milestones, (iii) sublicense fees, (iv)
royalties on sales of licensed products and (v) other consideration payable upon optional goods and services purchased by licensees.

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Our license agreements are accounted for as contracts with customers within the scope of Topic 606, with the exception of transactions for which the

counterparty is determined not to be a customer. At the inception of each license agreement, we determine the contract term for purposes of applying the
requirements of Topic 606. Licenses are generally terminable at the option of the licensee with advance notice to us. For each license granted, including
licenses granted upon the exercise of license options, we evaluate these termination rights to determine whether a substantive termination penalty would be
incurred by the licensee upon termination. If the licensee incurs a substantive termination penalty upon termination, the contract term for revenue
recognition purposes is generally equal to the stated term of the license, which is the life of the underlying licensed patents. Alternatively, if the licensee
does not incur a substantive termination penalty upon termination, the contract term for revenue recognition purposes may be shorter than the stated term of
the license, in which case the termination rights may be accounted for as contract renewal options. The determination of whether a substantive termination
penalty is associated with the termination rights requires significant judgment. In making this determination, we consider, among other things, the nature of
the intellectual property rights that would be returned to us upon termination, including the exclusivity of the licensed rights and the stage of development
of the licensed products, the payment terms, including the amount and timing of non-refundable or guaranteed payments, and the business purpose of the
termination rights granted to the licensee. Generally, the most significant judgment in determining whether a substantive termination penalty exists relates
to the amount of any up-front or guaranteed non-refundable payments relative to the amount of annual payments that may be avoided by the licensee upon
termination of the license. We consider all of the facts and circumstances relevant to each license when making this determination.

Performance obligations under our license agreements may include (i) the delivery of intellectual property licenses, (ii) options granted to licensees
to acquire additional licenses, to the extent the options represent material rights to the licensee, and (iii) research and development services to be performed
by us related to licensed products. License agreements may provide licensees with contract renewal options or options to acquire additional licenses, goods
or other services. Options are evaluated at the inception of the license agreement to determine whether they provide material rights to the licensee. In
making this determination, we consider whether the options are priced at an incremental discount to the standalone selling price for the underlying licenses,
goods or services, in which case the option is considered to be a material right to the licensee and is accounted for as a separate performance obligation
under the current license agreement. At the inception of each license agreement which contains performance obligations for research and development
services, we evaluate whether the license is distinct from the research and development services, which requires judgment. In making this determination,
we consider, among other things, the stage of development of the licensed products and whether the research and development services will significantly
impact further development of the licensed products. If it is determined that the license is not distinct from the research and development services, the
license is combined with the research and development services into a single performance obligation.

We evaluate the transaction price of our license agreements at the inception of each agreement and at each reporting date. The transaction price

includes the fixed consideration payable to us during the contract term, as well as any variable consideration to the extent that it is probable that a
significant reversal of revenue will not occur in the future. Fixed consideration under the license agreements includes up-front and annual fees payable
during the contract term. Variable consideration under the license agreements includes development and sales-based milestone payments, sublicense fees
and royalties on sales of licensed products. Consideration contingent upon the exercise of options by a licensee is excluded from the transaction price and
not accounted for as part of the license agreement until the option is exercised.

The transaction price for each license agreement is allocated to the underlying performance obligations based on their relative standalone selling

prices and recognized as revenue when (or as) the performance obligations are satisfied. Consideration allocated to performance obligations for the delivery
of an intellectual property license is recognized as revenue in full upon the delivery of the license to the licensee. Consideration allocated to performance
obligations for license options is recognized as revenue in full upon the earlier of the option exercise or expiration. The exercise of a license option by a
licensee is accounted for as a new license for revenue recognition purposes. Consideration allocated to performance obligations for research and
development services is recognized as revenue as the services are performed by us.

Up-front and annual licenses fees payable to us over the contract term of each license are included in the transaction price, and the portion of this

consideration allocated to the performance obligation for the delivery of the intellectual property license is recognized as revenue in full upon the delivery
of the license to the licensee. If annual license fees are payable to us in periods beyond 12 months from the delivery of the license, a significant financing
component is deemed to exist which provides a financing benefit to the licensee. If a significant financing component is identified, we adjust the
transaction price for the license to include only the present value of the annual license fees payable to us over the contract term. The discounted portion of
the license fees is recognized as interest income from licensing over the financing period of the license.

Development milestone payments are payable to us upon the achievement of specified development milestones. At the inception of each license

agreement that contains development milestone payments, we evaluate whether the milestones are considered probable

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of achievement and estimate the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant
revenue reversal will not occur in the future, milestone payments are included in the transaction price and recognized as revenue upon the delivery of the
license. Milestone payments contingent on the achievement of development milestones that are not within our control or the control of the licensee, such as
regulatory approvals, are not considered probable of being achieved and are excluded from the transaction price until the milestone is achieved. At each
reporting date, we re-evaluate the probability of achievement of each outstanding development milestone and, if necessary, adjust the transaction price for
any milestones for which the probability of achievement has changed due to current facts and circumstances. Any such adjustments are recorded on a
cumulative catch-up basis and recognized as revenue in the period of the adjustment.

Royalties on sales of licensed products, sales-based milestone payments, including milestones payable upon first commercial sales of licensed
products, and sublicense fees based on the receipt of certain fees by licensees from any sublicensees are excluded from the transaction price of each license
and recognized as revenue in the period that the related sales or sublicenses occur, provided that the associated license has been delivered to the licensee.

Royalty revenue to date consists primarily of royalties on net sales of Zolgensma, which is a licensed product under our license agreement with
Novartis Gene Therapies for the development and commercialization of treatments for SMA. We recognize royalty revenue from net sales of Zolgensma in
the period in which the underlying products are sold by Novartis Gene Therapies, which in certain cases may require us to estimate royalty revenue for
periods of net sales which have not yet been reported to us. Estimated royalties are reconciled to actual amounts reported in subsequent periods, and any
differences are recognized as an adjustment to royalty revenue in the period the royalties are reported. Sales-based milestone payments related to net sales
of Zolgensma are recognized as royalty revenue in the period in which the milestone is achieved.

We receive payments from licensees based on the billing schedules established in each license agreement. Amounts recognized as revenue which

have not yet been received from licensees, including unbilled royalties, are recorded as accounts receivable when our rights to the consideration are
conditional solely upon the passage of time. Amounts recognized as revenue which have not yet been received from licensees are recorded as contract
assets when our rights to the consideration are not unconditional. Contract assets are recorded as other current assets on the consolidated balance sheets. If a
licensee elects to terminate a license prior to the end of the license term, the licensed intellectual property is returned to us and any consideration recorded
as accounts receivable or contract assets which is not contractually payable by the licensee is charged off as a reduction of license revenue in the period of
the termination. Amounts received by us prior to the delivery of underlying performance obligations are deferred and recognized as revenue upon the
satisfaction of the performance obligations. Deferred revenue which is not expected to be recognized within 12 months from the reporting date is recorded
as non-current on the consolidated balance sheets.

Collaborative Arrangements

We evaluate our agreements with collaboration partners to determine whether they are within the scope of ASC 808, Collaborative

Arrangements (Topic 808). Such arrangements are within the scope of Topic 808 if they involve joint operating activities performed by parties that are both
active participants in the activities and exposed to significant risks and rewards dependent on the commercial success of such activities. This evaluation is
performed throughout the life of the arrangement based on any changes in the roles and responsibilities of the parties under the arrangement. For
collaboration arrangements within the scope of Topic 808 that contain multiple elements, we identify the various transactions with the counterparty and
determine if any unit of account is more reflective of a transaction with a customer and therefore should be accounted for within the scope of Topic 606.
For transactions that are accounted for pursuant to Topic 808, an appropriate method of recognition and presentation is determined and consistently applied.
For transactions that are accounted for pursuant to Topic 606, we apply the five-step model as described in our revenue recognition policies.

For additional information regarding our collaborative arrangements, including our RGX-314 collaboration with AbbVie which became effective in

November 2021, please refer to Note 10, “License and Collaboration Agreements” to the accompanying audited consolidated financial statements.

Accrued Research and Development Expenses

We estimate our accrued research and development expenses as of each balance sheet date. This process involves reviewing contracts and purchase

orders with service providers, identifying services that have been performed on our behalf and estimating the level of service performed, the expected
remaining period of performance and the associated expenses incurred for the service when we have not yet been invoiced or otherwise notified of actual
cost. Depending on the timing of payments to the service providers and the estimated expenses incurred, we may record net prepaid or accrued research and
development expenses relating to these costs.

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Examples of estimated accrued research and development expenses include fees paid to:

•

•

•

CROs and other vendors in connection with preclinical development and clinical studies;

CMOs and other vendors related to process development and manufacturing of materials for use in preclinical development and clinical
studies; and

service providers for professional service fees such as consulting and other research and development related services.

Our understanding of the status and timing of services performed relative to the actual status and timing may vary and may result in us reporting

changes in estimates in any particular period. To date, there have been no material differences from our estimates to the amount actually incurred.

Stock-based Compensation

We account for our stock-based compensation awards in accordance with ASC 718, Compensation—Stock Compensation. ASC 718 requires all

stock-based awards to employees and nonemployees to be recognized as expense based on the grant date fair value of the awards. Our stock-based awards
include stock options granted to employees and nonemployees, restricted stock units granted to employees and shares issued to employees under our
employee stock purchase plan.

Our stock-based awards may be subject to either service or performance-based vesting conditions. Compensation expense related to awards with
service-based vesting conditions is recognized on a straight-line basis based on the estimated grant date fair value over the requisite service period of the
award, which is generally the vesting term. Compensation expense related to awards with performance-based vesting conditions is recognized based on the
estimated grant date fair value over the requisite service period using the accelerated attribution method to the extent achievement of the performance
condition is probable.

We have elected to not estimate forfeitures of stock-based awards and account for forfeitures as they occur.

We estimate the fair value of our stock option awards using the Black-Scholes option-pricing model, which requires the input of subjective
assumptions, including (i) the fair value of the underlying common stock, (ii) the expected stock price volatility, (iii) the expected term of the award, (iv)
the risk-free interest rate and (v) expected dividends. The fair value of our common stock, as used as an input to determine the fair value of our stock option
awards, is based on the closing price of our common stock on the date of the grant. For reporting periods through December 31, 2020, we did not have
sufficient historical or implied volatility data for our common stock necessary to estimate expected volatility over a period of time commensurate with the
expected term of our stock option awards. For such reporting periods, we estimated expected volatility based on a weighted-average of the historical
volatility of our common stock and the common stock of a selected peer group of similar publicly traded companies for which sufficient historical volatility
data was available. As more historical trading data became available over time, we gradually increased the weight placed on the historical volatility of our
common stock versus the historical peer group volatility data. Effective January 1, 2021, we eliminated the use of historical peer group volatility data and
now estimate expected volatility based solely on the historical volatility of our common stock given that sufficient historical volatility data has become
available. We estimate the expected term of our employee stock options using the “simplified” method, whereby the expected term equals the arithmetic
average of the vesting term and the original contractual term of the option, due to our lack of sufficient historical data. For stock options granted to
nonemployees, we use the contractual term of the award rather than expected term to estimate the fair value of the award. We estimate the risk-free interest
rates for periods within the expected term of its options based on the rates of U.S. Treasury securities with maturity dates commensurate with the expected
term of the associated awards. We assume a dividend yield of zero for our common stock as we have never paid dividends and do not expect to pay
dividends for the foreseeable future.

We estimate the fair value of our restricted stock units based on the closing price of our common stock on the date of the grant.

Interest Expense on Liability Related to Sale of Future Royalties

We recorded a liability for the net proceeds received from the sale of our Zolgensma royalty payments to HCR. The liability is amortized over the

estimated life of the arrangement using the effective interest method. The total amount of royalty payments received by HCR under the agreement, less the
net proceeds we received from the sale, is recorded as interest expense over the life of the arrangement. We estimate the effective interest rate based on our
estimate of total future royalty payments to be received by HCR under the agreement. We reassess these estimates at each reporting date and adjust the
effective interest rate and amortization of the liability on a prospective basis as necessary.

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Income Taxes

We account for income taxes in accordance with ASC 740, Income Taxes, which provides for deferred taxes using an asset and liability approach.

We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial
statements or tax returns. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets
and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are provided if based upon
the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

As of December 31, 2021, we had U.S. state net operating loss (NOL) carryforwards of $59.9 million and federal and state research and

development tax credit carryforwards of $45.6 million (net of unrecognized tax benefits of $0.1 million) which may be available to offset future income tax
liabilities. A portion of our NOL and credit carryforwards as of December 31, 2021 may be carried forward indefinitely, with the remaining portion
expiring at various dates between 2034 and 2041. We had no federal NOL carryforwards as of December 31, 2021.

We have evaluated the positive and negative evidence bearing upon the realizability of our deferred tax assets, including our NOL and credit

carryforwards. Based on our history of operating losses, and other relevant facts and circumstances, we concluded that it is more likely than not that the
benefit of our deferred tax assets will not be realized. Accordingly, we provided a full valuation allowance for our net deferred tax assets as of
December 31, 2021 and 2020.

Recent Accounting Pronouncements

See Note 2 “Recent Accounting Pronouncements” in the notes to the consolidated financial statements appearing elsewhere in this Annual Report

on Form 10-K for a full description of accounting pronouncements which we have recently adopted and the impact to our financial statements upon
adoption.

Results of Operations

Our consolidated results of operations were as follows (in thousands): 

Revenues

License and royalty revenue

Total revenues
Operating Expenses
Cost of revenues
Research and development
General and administrative
Credit losses (recoveries) and other

Total operating expenses
Income (loss) from operations

Other Income (Expense)

Interest income from licensing
Investment income
Interest expense

Total other income (expense)
Income (loss) before income taxes

Income Tax Benefit (Expense)
Net income (loss)

2021

Years Ended December 31,
2020

2019

2021 vs. 2020

2020 vs. 2019

Change

  $

470,347 
470,347 

 $

154,567 
154,567 

 $

35,233 
35,233 

 $

315,780 
315,780 

 $

119,334 
119,334 

51,833 
181,437 
79,333 
(2,236)   

310,367 
159,980 

719 
6,825 
(26,277)   
(18,733)   
141,247 
(13,407)   
127,840    $

74

  $

35,714 
166,294 
63,817 
7,975 
273,800 
(119,233)   

4,271 
9,723 
(771)   

13,223 
(106,010)   
(5,240)   
(111,250)   $

8,241 
124,185 
51,815 

(10)   

184,231 
(148,998)   

2,951 
48,559 
— 
51,510 
(97,488)   
2,755 
(94,733)   $

16,119 
15,143 
15,516 
(10,211)   
36,567 
279,213 

(3,552)   
(2,898)   
(25,506)   
(31,956)   
247,257 

(8,167)   
239,090    $

27,473 
42,109 
12,002 
7,985 
89,569 
29,765 

1,320 
(38,836)
(771)
(38,287)
(8,522)
(7,995)
(16,517)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
  
  
  
  
  
  
  
  
  
   
  
  
  
  
   
  
  
  
  
  
  
  
  
  
   
  
  
  
  
   
  
  
  
  
   
  
  
  
  
   
  
   
  
  
  
  
   
  
  
   
  
  
  
  
  
  
  
  
  
   
  
  
  
   
  
  
  
   
  
   
  
  
   
  
  
   
  
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Comparison of the Years Ended December 31, 2021 and 2020

License and Royalty Revenue. License and royalty revenue increased by $315.8 million, from $154.6 million for the year ended December 31, 2020

to $470.3 million for the year ended December 31, 2021. The increase was primarily attributable to the following:

•

•

Revenue of $370.0 million recognized in 2021 under our collaboration and license agreement with AbbVie for the development and
commercialization of RGX-314, which became effective in November 2021;

an increase of $33.3 million in Zolgensma royalty revenues, from $61.6 million in 2020 to $95.0 million in 2021. As reported by Novartis,
sales of Zolgensma increased by 47% in 2021 as compared to 2020, driven by geographic expansion of product access.

The increase in license and royalty revenue was partially offset by an $80.0 million milestone payment recognized as revenue in the third quarter of
2020 upon the achievement of $1.0 billion in cumulative net sales of Zolgensma. Upon the achievement of this milestone, there are no further development
or sales-based milestones remaining under the associated license agreement with Novartis Gene Therapies for the development and commercialization of
treatments for SMA. The increase in cost of revenues in 2021 was primarily driven by royalties payable to licensors on net sales of Zolgensma and
sublicense fees payable to licensors on revenues generated under the collaboration and license agreement with AbbVie.

Research and Development Expense. Research and development expenses increased by $15.1 million, from $166.3 million for the year ended

December 31, 2020 to $181.4 million for the year ended December 31, 2021. The increase was primarily attributable to the following:

•

•

•

•

an increase of $13.4 million in personnel-related costs as a result of increased headcount of research and development personnel, including a
$3.3 million increase in stock-based compensation expense;

an increase of $8.2 million in costs of laboratories and facilities used by research and development personnel, including a $1.1 million
increase in depreciation expense allocated to research and development functions, largely driven by the occupation of our new corporate,
research and manufacturing headquarters in 2021;

an increase of $8.1 million in costs associated with clinical trial and regulatory activities for our lead product candidates, largely driven by
RGX-314 and RGX-121 clinical trials; and

an increase of $2.0 million in costs associated with preclinical activities and other early stage research and development.

The increase in research and development expenses was partially offset by a decrease of $13.6 million in costs associated with manufacturing-

related activities, largely driven by manufacturing campaigns for RGX-201 and RGX-121 clinical supply performed in 2020, and $5.9 million of
development cost reimbursement from AbbVie recorded in 2021 under our RGX-314 collaboration which was recorded as a reduction of research and
development expenses.

General and Administrative Expense. General and administrative expenses increased by $15.5 million, from $63.8 million for the year ended

December 31, 2020 to $79.3 million for the year ended December 31, 2021. The increase was primarily attributable to the following:

•

•

•

an increase of $8.4 million in personnel-related costs as a result of increased headcount of general and administrative personnel, including a
$3.5 million increase in stock-based compensation expense;

an increase of $3.4 million for professional services, primarily related to legal and other advisory services; and

an increase of $1.2 million in costs of facilities used by general and administrative personnel, including depreciation expense allocated to
general and administrative functions, largely driven by the occupation of our new corporate, research and manufacturing headquarters in
2021.

Credit Losses (Recoveries) and Other. Credit losses (recoveries) and other decreased by $10.2 million during the year ended December 31, 2021 as
compared to the year ended December 31, 2020. The decrease was primarily attributable to changes in the allowance for credit losses associated with our
accounts receivable from Abeona Therapeutics Inc. (Abeona) for license fees due under a license agreement which was terminated in 2020. We recorded
credit losses of $7.7 million in 2020 related to the accounts receivable from Abeona. In November 2021, we entered into a settlement agreement with
Abeona related to the amounts due to us under the terminated license agreement. As a result of the settlement, we recorded credit recoveries of $2.6 million
in 2021 related to the accounts receivable from Abeona. For further information regarding the provision for credit losses, refer to Note 10, “License and
Collaboration Agreements—Abeona Therapeutics Inc.” to the accompanying consolidated financial statements.

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Investment Income. Investment income decreased by $2.9 million, from $9.7 million for the year ended December 31, 2020 to $6.8 million for the

year ended December 31, 2021. The decrease was primarily attributable to net gains of $4.8 million recognized in 2020 related to our marketable equity
securities of Prevail Therapeutics Inc., all of which had been sold as of December 31, 2020, and a decrease of $3.2 million in interest income in 2021
primarily attributable to lower yields on investments in cash equivalents and marketable debt securities. The decrease in investment income was partially
offset by a realized gain of $5.2 million recognized in 2021 upon the acquisition of our non-marketable equity securities of Corlieve Therapeutics SAS
(Corleive) by uniQure N.V. (uniQure) in July 2021.

Interest Expense. Interest expense increased by $25.5 million, from $0.8 million for the year ended December 31, 2020 to $26.3 million for the year

ended December 31, 2021. Interest expense consists solely of imputed interest under our royalty purchase agreement with HCR for the sale of future
Zolgensma royalties, which occurred in December 2020.

Liquidity and Capital Resources

Sources of Liquidity

As of December 31, 2021, we had cash, cash equivalents and marketable securities of $849.3 million, which were primarily derived from the sale of

our common stock, license and royalty revenue and the monetization of our Zolgensma royalty stream. We expect that our cash, cash equivalents and
marketable securities as of December 31, 2021, will enable us to fund our operating expenses and capital expenditure requirements, and are sufficient to
meet our financial commitments and obligations, for at least the next 12 months from the date of this report, based on our current business plan. Our recent
sources of liquidity include the following events and transactions:

•

•

•

•

In September 2021, we entered into the AbbVie Collaboration Agreement for the development and commercialization of RGX-314, which
became effective in November 2021. Pursuant to the AbbVie Collaboration Agreement, we received an up-front fee of $370.0 million from
AbbVie upon the effective date of the agreement in November 2021, and we are eligible to receive up to $1.38 billion from AbbVie upon the
achievement of specified development and sales-based milestones. Additionally, the parties will share equally in the net profits and net losses
associated with the commercialization of RGX-314 in the United States, and we are eligible to receive tiered royalties on net sales by AbbVie
of RGX-314 outside the United States.

In January 2021, we completed a public offering of 4,899,000 shares of our common stock (inclusive of 639,000 shares pursuant to the full
exercise by the underwriters of their option to purchase additional shares) at a price of $47.00 per share. The aggregate net proceeds from the
offering, inclusive of the underwriters’ option exercise, were $216.1 million, net of underwriting discounts and commissions and offering
expenses payable by us.

In December 2020, we entered into a royalty purchase agreement with HCR to monetize a portion of our Zolgensma royalty stream. Under
the agreement, we received a gross up-front payment of $200.0 million from HCR in December 2020. In exchange, HCR received the rights
to a capped amount of Zolgensma royalty payments under our license agreement with Novartis Gene Therapies, including a portion of the
royalty payments we received in the fourth quarter of 2020. The aggregate net proceeds received from the sale were $192.5 million, net of a
$4.0 million deduction from the purchase price as payment for the pledged royalties we received in the fourth quarter of 2020 and other
transaction costs payable by us.

Novartis Gene Therapies launched commercial sales of Zolgensma in the second quarter of 2019, upon which we began recognizing royalty
revenue on net sales of the licensed product. In accordance with the license agreement, Novartis Gene Therapies was obligated to pay a sales-
based milestone fee of $80.0 million to us upon the achievement of $1.0 billion in cumulative net sales of licensed products. Novartis Gene
Therapies achieved cumulative net sales of Zolgensma of $1.0 billion in third quarter of 2020 and we received payment of the $80.0 million
milestone fee in October 2020. Upon the achievement of this milestone, there are no further development or sales-based milestones remaining
under the associated license agreement with Novartis Gene Therapies for the development and commercialization of treatments for SMA.

We intend to devote the majority of our current capital to clinical development, seeking regulatory approval of our product candidates and capital

expenditures to build out additional office, laboratory and manufacturing capacity, including the ongoing buildout of our corporate, manufacturing and
research headquarters in Rockville, Maryland. Because of the numerous risks and uncertainties associated with the development and commercialization of
gene therapy product candidates, we are unable to estimate the total amount of operating expenditures and capital outlays necessary to complete the
development of our product candidates. Additionally, our estimates are based on assumptions that may prove to be wrong, and we may use our available
capital resources sooner than we currently expect. Furthermore, given the continuing uncertainty and volatile market and economic conditions caused by
the COVID-19 pandemic, as well as the potential for further effects due to a resurgence in COVID-19 infections, we will continue to monitor the nature
and extent of the impact of the COVID-19 pandemic on our liquidity and capital resources.

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Cash Flows

Our consolidated cash flows were as follows (in thousands):

Net cash provided by (used in) operating activities
Net cash provided by (used in) investing activities
Net cash provided by financing activities

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

Cash Flows from Operating Activities

2021

Years Ended December 31,
2020

2019

  $

  $

218,875    $
(406,642)  
195,250   

7,483    $

(54,061)   $
122,759   
200,214   
268,912    $

(107,705)
93,559 
8,376 
(5,770)

Our net cash provided by operating activities for the year ended December 31, 2021 increased by $272.9 million from the year ended December 31,
2020. The increase was largely driven by the up-front payment of $370.0 million received under the AbbVie Collaboration Agreement in November 2021
and an increase in Zolgensma royalties received during the period. The increase was partially offset by the $80 million sales-based milestone payment
received in 2020 related to net sales of Zolgensma, and increases in operating expenses in 2021. We expect to incur regular net cash outflows from
operations for the foreseeable future as we continue the development and advancement of our product candidates and other research programs.

For the year ended December 31, 2021, our net cash provided by operating activities of $218.9 million consisted of net income of $127.8 million,

adjustments for non-cash items of $50.8 million and favorable changes in working capital of $40.2 million. Adjustments for non-cash items primarily
consisted of stock-based compensation expense of $38.8 million, depreciation and amortization expense of $9.6 million, net amortization of premiums on
marketable debt securities of $5.8 million and non-cash interest expense recognized under our royalty purchase agreement with HCR of $4.6 million, and
were partially offset by a realized gain of $5.2 million recognized upon the acquisition of our Corlieve equity securities by uniQure in July 2021. The
changes in working capital include an increase in accrued expenses and other current liabilities of $29.9 million which was largely driven by increases in
sublicense fees and royalties payable to licensors, income taxes payable and accrued personnel costs. The changes in working capital also included a
decrease in accounts receivable of $14.1 million, which was largely driven by amounts collected under our settlement agreement with Abeona, and an
increase in operating lease liabilities of $12.1 million, which was largely driven by funds received under our tenant improvement allowance for the ongoing
buildout of our new headquarters facility in Rockville, Maryland. The changes in working capital were partially offset by an increase in prepaid expenses
of $8.2 million, which was largely driven by advances paid to service providers for clinical trial and manufacturing-related services to be performed in
future periods, and an increase in other current assets of $7.3 million, which was largely driven by amounts due from AbbVie for reimbursement of
development costs under our RGX-314 collaboration. Other changes in working capital were incurred in the normal course of business.

For the year ended December 31, 2020, our net cash used in operating activities of $54.1 million consisted of a net loss of $111.3 million, offset by

adjustments for non-cash items of $43.0 million and favorable changes in working capital of $14.2 million. Adjustments for non-cash items primarily
consisted of stock-based compensation expense of $31.9 million, depreciation and amortization expense of $8.4 million and credit losses of $7.7 million
related to our accounts receivable from Abeona. The changes in working capital include an increase in accrued expenses and other current liabilities of
$17.4 million which was largely driven by increases in sublicense fees payable to licensors, accrued external research and development expenses, income
taxes payable and accrued personnel costs. The changes in working capital were partially offset by an increase in accounts receivable of $9.9 million which
was largely driven by an increase in Zolgensma royalties receivable at the end of the period. Other changes in working capital were incurred in the normal
course of business.

Cash Flows from Investing Activities

For the year ended December 31, 2021, our net cash used in investing activities consisted of $498.1 million to purchase marketable debt securities

and $84.2 million to purchase property and equipment, offset by $170.1 million in maturities of marketable debt securities and $5.6 million of proceeds
received from the acquisition of our Corlieve equity securities by uniQure in July 2021. The substantial majority of our capital expenditures for the year
ended December 31, 2021 were related to the build out of our corporate, manufacturing and research headquarters at 9804 Medical Center Drive in
Rockville, Maryland. We expect capital expenditures related to this project to continue into 2022 as we complete the build out of this facility, however,
amounts in future periods are expected to decrease as compared to 2021.

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For the year ended December 31, 2020, our net cash provided by investing activities consisted of $272.7 million in sales and maturities of
marketable debt and equity securities, offset by $123.0 million to purchase marketable debt securities and $26.9 million to purchase property and
equipment.

Cash Flows from Financing Activities

For the year ended December 31, 2021, our net cash provided by financing activities primarily consisted of $216.1 million in net proceeds received
from a public offering of our common stock completed in January 2021, net of underwriting discounts and commissions and other offering expenses paid
during the period, and $6.0 million in proceeds received from the exercise of stock options and issuance of common stock under our employee stock
purchase plan, and was partially offset by $26.6 million of Zolgensma royalties paid to HCR, net of imputed interest, under our royalty purchase
agreement.

For the year ended December 31, 2020, our net cash provided by financing activities consisted of $192.8 million in net proceeds received from the
sale of future Zolgensma royalties to HCR, net of transaction costs paid during the period, and $7.4 million in proceeds received from the exercise of stock
options and issuance of common stock under our employee stock purchase plan.

Additional Capital Requirements

Our financial obligations primarily consist of vendor contracts to provide research services and other purchase commitments with suppliers. In the

normal course of business, we enter into services agreements with contract research organizations, contract manufacturing organizations and other third
parties. Generally, these agreements provide for termination upon notice, with specified amounts due upon termination based on the timing of termination
and the terms of the agreement. The amounts and timing of payments under these agreements are uncertain and contingent upon the initiation and
completion of the services to be provided.

Our commitments also include obligations to our licensors under our in-license agreements, which may include sublicense fees, milestones fees,

royalties and reimbursement of patent maintenance costs. Sublicense fees are payable to licensors when we sublicense underlying intellectual property to
third parties; the fees are based on a percentage of the license fees we receive from sublicensees. Milestone fees are payable to licensors upon our future
achievement of certain development and regulatory milestones. Royalties are payable to licensors based on a percentage of net sales of licensed products.
Patent maintenance costs are payable to licensors as reimbursement for the cost of maintaining of license patents. Due to the contingent nature of the
payments, the amounts and timing of payments to licensors under our in-license agreements are uncertain and may fluctuate significantly from period to
period.

We have entered into a number of long-term operating leases for office, laboratory and manufacturing space in Rockville, Maryland and New York,
New York, as well as a number of laboratory and other equipment leases. Please refer to Note 6 to the accompanying consolidated financial statements for
further information regarding our lease commitments.

Under the terms of our royalty purchase agreement with HCR, our future Zolgensma royalties, less amounts payable by us to certain licensors, will

be payable to HCR up to a specified capped amount. As of December 31, 2021, the total amount of future Zolgensma royalties to be paid to HCR under the
agreement was $207.8 million if paid by November 7, 2024, or $247.8 million if paid after that date. We have no obligation to repay any amounts to HCR
if total future Zolgensma royalty payments are not sufficient to repay these amounts.

Future Funding Requirements

We have incurred cumulative losses since our inception and had an accumulated deficit of $161.2 million as of December 31, 2021. Our transition to

recurring profitability is dependent upon achieving a level of revenues adequate to support our cost structure, which depends heavily on the successful
development, approval and commercialization of our product candidates. We do not expect to achieve such revenues, and expect to continue to incur losses,
for at least the next several years. We expect that our research and development and general and administrative expenses will continue to increase for the
foreseeable future as we continue the development of, and seek regulatory approval for, our product candidates. Subject to obtaining regulatory approval
for our product candidates, we expect to incur significant commercialization expenses for product sales, marketing, manufacturing and distribution.
Additionally, we expect our capital expenditures will continue to increase due to costs associated with building out additional office, laboratory and
manufacturing capacity to further support the development of our product candidates and potential commercialization efforts, particularly with respect to
the build out of our corporate, manufacturing and research headquarters as discussed above. As a result, we will need significant additional capital to fund
our operations, which we may obtain through one or more equity offerings, debt financings or other third-party funding, including potential strategic
alliances and licensing or collaboration arrangements.

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Our future capital requirements will depend on many factors, including:

•

•

•

•

•

•

•

•

•

•

•

•

•

the timing of enrollment, commencement and completion of our clinical trials;

the results of our clinical trials;

the results of our preclinical studies for our product candidates and any subsequent clinical trials;

the scope, progress, results and costs of drug discovery, laboratory testing, preclinical development and clinical trials for our product
candidates;

the costs associated with building out additional laboratory and manufacturing capacity;

the costs, timing and outcome of regulatory review of our product candidates;

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

revenue, if any, received from commercial sales of our products, should any of our product candidates receive marketing approval;

revenue received from commercial sales of Zolgensma and other revenue, if any, received in connection with commercial sales of our
licensees’ and collaborators’ products, should any of their product candidates receive marketing approval;

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

our current licensing agreements or collaborations remaining in effect, including the AbbVie Collaboration Agreement;

our ability to establish and maintain additional licensing agreements or collaborations on favorable terms, if at all; and

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

Many of these factors are outside of our control. Identifying potential 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
regulatory and marketing approval and achieve product sales. In addition, our product candidates, if approved, may not achieve commercial success. Our
product revenues, if any, and any commercial milestones or royalty payments under our licensing agreements, will be derived from or based on sales of
products that may not be commercially available for many years, if at all. In addition, revenue from our NAV Technology Platform licensing is dependent
in part on the clinical and commercial success of our licensing partners, including the commercialization of Zolgensma. Accordingly, we will need to
continue to rely on additional financing to achieve our business objectives.

The issuance of additional securities, whether equity or debt, by us, or the possibility of such issuance, may cause the market price of our common
stock to decline. Adequate additional financing may not be available to us on acceptable terms, or at all. We also could be required to seek funds through
arrangements with partners or otherwise that may require us to relinquish rights to our intellectual property, our product candidates or otherwise agree to
terms unfavorable to us.

Off-Balance Sheet Arrangements

We did not have any off-balance sheet arrangements during the periods presented, and we do not currently have, any off-balance sheet arrangements,

as defined in the rules and regulations of the SEC.

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ITEM 7A.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

We are exposed to market risk related to changes in interest rates. Our primary exposure to interest rate risk results from the cash equivalents and
marketable securities in our investment portfolio. Our primary objectives in managing our investment portfolio are to preserve principal, maintain proper
liquidity to meet operating needs and maximize yields. At any time, significant changes in interest rates can affect the fair value of the investment portfolio
and its interest earnings. Currently, we do not hedge these interest rate exposures. As of December 31, 2021 and 2020, we had cash, cash equivalents and
marketable securities of $849.3 million and $522.5 million, respectively. Our cash equivalents and marketable securities as of December 31, 2021 consisted
of money market mutual funds, U.S. government and agency securities, certificates of deposit and corporate bonds. If market interest rates were to increase
immediately and uniformly by 100 basis points, or one percentage point, from levels at December 31, 2021, we estimate that the increase would have
resulted in a hypothetical decline of $7.1 million in the net fair value of our interest-sensitive securities. A similar increase in market interest rates as of
December 31, 2020 would have resulted in an estimated hypothetical decline of $1.0 million in the net fair value of our interest-sensitive securities as of
December 31, 2020.

Foreign Currency Exchange Rate Risk

We are exposed to foreign currency exchange rate risk as a result of entering into transactions denominated in currencies other than U.S. dollars,

primarily including euros, British pounds and Japanese yen. All foreign currency transactions settle on the applicable spot exchange basis at the time such
payments are made. Accordingly, an adverse movement in foreign exchange rates between the U.S. dollar and the aforementioned currencies could impact
our results of operations and cash flows. Currently, we do not hedge these foreign currency exchange rate exposures. The effect of a hypothetical 10%
change in foreign currency exchange rates applicable to our business would not materially harm our business, financial condition or results of operations.

ITEM 8.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The financial statements and related financial statement schedules required to be filed are listed in the Index to Consolidated Financial Statements

and are incorporated herein.

ITEM 9.

CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A.

CONTROLS AND PROCEDURES

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of our disclosure

controls and procedures as of December 31, 2021. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the
Securities Exchange Act of 1934, as amended (the Exchange Act), means controls and other procedures of a company that are designed to ensure that
information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and
reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and
procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is
accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow
timely decisions regarding required disclosure.

Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of December 31, 2021, our disclosure controls

and procedures were effective at a reasonable assurance level.

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Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial

reporting is defined in Rules 13a-15(f) and 15d-15(f) promulgated under the Exchange Act as a process designed by, or under the supervision of, our
principal executive and principal financial officers and effected by our Board of Directors, management and other personnel, to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally
accepted accounting principles and includes those policies and procedures that:

•

•

•

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

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

provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could
have a material effect on the financial statements.

Under the supervision and with the participation of management, including our principal executive and financial officers, we assessed our internal

control over financial reporting as of December 31, 2021, based on criteria for effective internal control over financial reporting established in Internal
Control — Integrated Framework (2013), issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our
management’s opinion, we have maintained effective internal control over financial reporting as of December 31, 2021, based on criteria established in the
COSO 2013 framework.

The effectiveness of our internal control over financial reporting as of December 31, 2021 has been audited by PricewaterhouseCoopers LLP, our

independent registered public accounting firm, as stated in their report which accompanies our audited consolidated financial statements appearing
elsewhere in this Annual Report on Form 10-K.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that

occurred during the quarter ended December 31, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over
financial reporting.

Limitations on the Effectiveness of Controls

Control systems, no matter how well conceived and operated, are designed to provide a reasonable, but not an absolute, level of assurance that the
objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of
controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute
assurance that all control issues and instances of fraud, if any, have been detected. Because of the inherent limitations in any control system, misstatements
due to error or fraud may occur and not be detected.

ITEM 9B.

OTHER INFORMATION

None.

ITEM 9C.

DISCLOSURE REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

Not applicable.

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PART III

ITEM 10.

DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this item will be included in our proxy statement for the 2022 annual meeting of stockholders to be filed with the SEC

within 120 days of the fiscal year ended December 31, 2021 (2022 Proxy Statement) under the headings “Election of Directors,” “Information about our
Executive Officers” and “Corporate Governance” and is incorporated herein by reference.

We maintain a code of business conduct and ethics that qualifies as a “code of ethics” under Item 406 of the SEC’s Regulation S-K and applies to

each of our directors, officers and employees, including our principal executive officer, principal financial officer, principal accounting officer and
controller, or persons performing similar functions. The code of business conduct and ethics is available in the corporate governance section of our
corporate website at www.regenxbio.com. Any amendment or waiver of the “code of ethics” provisions of the code of business conduct and ethics for an
executive officer or director may be granted only by our Board of Directors or a committee thereof and must be timely disclosed as required by applicable
law. We intend to satisfy the disclosure requirements regarding any such amendment or waiver applicable to any principal executive officer, principal
financial officer, principal accounting officer or controller, or persons performing similar functions, in a current report filed with the SEC on Form 8-K or
on our corporate website at www.regenxbio.com.

ITEM 11.

EXECUTIVE COMPENSATION

The information required by this item will be included in our 2022 Proxy Statement under the headings “Corporate Governance,” “Director

Compensation” and “Executive Compensation” and is incorporated herein by reference.

ITEM 12.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER
MATTERS

The information required by this item will be included in our 2022 Proxy Statement under the headings “Executive Compensation” and “Security

Ownership of Certain Beneficial Owners and Management” and is incorporated herein by reference.

ITEM 13.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this item will be included in our 2022 Proxy Statement under the headings “Certain Relationships and Related Party

Transactions” and “Corporate Governance” and is incorporated herein by reference.

ITEM 14.

PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by this item will be included in our 2022 Proxy Statement under the heading “Ratification of Appointment of Independent

Registered Public Accounting Firm” and is incorporated herein by reference.

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PART IV

ITEM 15.

EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of, or incorporated by reference into, this Annual Report on Form 10-K:

1.

2.

3.

Financial Statements. See Index to Consolidated Financial Statements under Item 8 of this Annual Report on Form 10-K.

Financial Statement Schedules. All schedules have been omitted because the information required to be presented in them is not
applicable or is shown in the financial statements or related notes.

Exhibits. We have filed, or incorporated into this Annual Report on Form 10-K by reference, the exhibits listed on the
accompanying Exhibit Index immediately following the financial statements in this Annual Report on Form 10-K.

(b) Exhibits. See Item 15(a)(3) above.

(c) Financial Statement Schedules. See Item 15(a)(2) above.

ITEM 16.

FORM 10-K SUMMARY

Not applicable.

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REGENXBIO INC.
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm (PCAOB ID: 238)
Consolidated Financial Statements:

Consolidated Balance Sheets
Consolidated Statements of Operations and Comprehensive Income (Loss)
Consolidated Statements of Stockholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

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To the Board of Directors and Stockholders of REGENXBIO Inc.

Report of Independent Registered Public Accounting Firm

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of REGENXBIO Inc. and its subsidiaries (the “Company”) as of December 31, 2021 and
2020, and the related consolidated statements of operations and comprehensive income (loss), of stockholders’ equity, and of cash flows for each of the
three years in the period ended December 31, 2021, including the related notes (collectively referred to as the “consolidated financial statements”). We also
have audited the Company's internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control - Integrated
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of
December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2021 in
conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material
respects, effective internal control over financial reporting as of December 31, 2021, based on criteria established in Internal Control - Integrated
Framework (2013) issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting,
and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial
Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company's
internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight
Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable
assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective
internal control over financial reporting was maintained in all material respects.  

Our audits of the consolidated financial statements 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. 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 audits also
included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our
opinions.

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 (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly
reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit
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 (iii) 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.

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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.

Critical Audit Matters

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was
communicated or required to be communicated to the audit committee and that (i) relates to accounts or disclosures that are material to the consolidated
financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not
alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below,
providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

License revenue- Substantive Termination Penalties

As described in Notes 2 and 10 to the consolidated financial statements, at the inception of each license agreement, management determines the contract
term for purposes of applying the requirements of generally accepted accounting policies relevant to revenue recognition. Licenses are generally terminable
at the option of the licensee with advance notice to the Company. For each license granted, including licenses granted upon the exercise of license options,
management evaluates these termination rights to determine whether a substantive termination penalty would be incurred by the licensee upon termination.
If the licensee incurs a substantive termination penalty upon termination, the contract term for revenue recognition purposes is generally equal to the stated
term of the license, which is the life of the underlying licensed patents. Alternatively, if the licensee does not incur a substantive termination penalty upon
termination, the contract term for revenue recognition purposes may be shorter than the stated term of the license, in which case the termination rights may
be accounted for as contract renewal options. The determination of whether a substantive termination penalty is associated with the termination rights
requires significant judgment. In making this determination, management considers, among other things, the nature of the intellectual property rights that
would be returned to the Company upon termination, including the exclusivity of the licensed rights and the stage of development of the licensed products,
the payment terms, including the amount and timing of non-refundable or guaranteed payments, and the business purpose of the termination rights granted
to the licensee. Generally, the most significant judgment in determining whether a substantive termination penalty exists relates to the amount of any up-
front or guaranteed non-refundable payments relative to the amount of annual payments that may be avoided by the licensee upon termination of the
license. Management considers all of the facts and circumstances relevant to each license when making this determination.  License revenue makes up a
portion of the Company’s consolidated license and royalty revenue of $470.3 million for the year ended December 31, 2021.

The principal considerations for our determination that performing procedures relating to license revenue, specifically substantive termination penalties, is
a critical audit matter are the significant judgment by management in determining whether each license granted, including licenses granted upon the
exercise of license options, had substantive termination penalties used to determine the contract term for revenue recognition. This in turn led to significant
auditor judgment, subjectivity and effort in performing procedures to evaluate the audit evidence obtained relating to management’s determination of the
existence of a substantive termination penalty in license revenue agreements.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated
financial statements. These procedures included testing the effectiveness of controls relating to the revenue recognition process, including controls over the
determination of the existence of a substantive termination penalty in license revenue agreements. These procedures also included, among others,
evaluating and testing, for a sample of license revenue contracts, management’s process for determining whether a licensee incurs a substantive termination
penalty upon termination, which included evaluating (i) the nature of the license, (ii) the payment terms, (iii) the business purpose of contract terms that
include termination rights, and (iv) the impact of contract cancellation on other performance obligations, if any, in the contract.

/s/ PricewaterhouseCoopers LLP

Washington, District of Columbia
March 1, 2022

We have served as the Company’s auditor since 2015.

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REGENXBIO INC.
CONSOLIDATED BALANCE SHEETS
(in thousands, except per share data)

As of December 31,

2021

2020

Assets
Current assets

Cash and cash equivalents
Marketable securities
Accounts receivable (net of allowance of $7,678 as of December 31, 2020)
Prepaid expenses
Other current assets

Total current assets

Marketable securities
Accounts receivable (net of allowance of $3,758 as of December 31, 2021)
Property and equipment, net
Operating lease right-of-use assets
Restricted cash
Other assets

Total assets

Liabilities and Stockholders’ Equity
Current liabilities

Accounts payable
Accrued expenses and other current liabilities
Deferred revenue
Operating lease liabilities
Liability related to sale of future royalties

Total current liabilities

Deferred revenue
Operating lease liabilities
Liability related to sale of future royalties
Other liabilities

Total liabilities

Commitments and contingencies (Note 8)
Stockholders’ equity

Preferred stock; $0.0001 par value; 10,000 shares authorized, no shares issued
   and outstanding at December 31, 2021 and 2020
Common stock; $0.0001 par value; 100,000 shares authorized at December 31, 2021
   and 2020; 42,831 and 37,476 shares issued and outstanding at
   December 31, 2021 and 2020, respectively
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit

Total stockholders’ equity
Total liabilities and stockholders’ equity

  $

  $

  $

  $

345,209    $
112,230   
32,439   
18,752   
10,196   
518,826   
391,907   
2,262   
131,547   
60,904   
2,030   
6,428   
1,113,904    $

11,387    $
76,111   
3,333   
1,752   
37,889   
130,472   
—   
84,929   
133,460   
745   
349,606   

338,426 
137,314 
42,999 
10,505 
1,953 
531,197 
46,809 
3,267 
56,467 
63,815 
1,330 
5,279 
708,164 

10,622 
49,082 
449 
2,500 
18,794 
81,447 
3,783 
70,153 
174,504 
524 
330,411 

—   

— 

4   
928,095   
(2,569)  
(161,232)  
764,298   
1,113,904    $

4 
667,181 
(360)
(289,072)
377,753 
708,164

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

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REGENXBIO INC.
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
(in thousands, except per share data)

Revenues

License and royalty revenue

Total revenues
Operating Expenses
Cost of revenues
Research and development
General and administrative
Credit losses (recoveries) and other

Total operating expenses
Income (loss) from operations

Other Income (Expense)

Interest income from licensing
Investment income
Interest expense

Total other income (expense)
Income (loss) before income taxes

Income Tax Benefit (Expense)
Net income (loss)

Other Comprehensive Income (Loss)

Unrealized gain (loss) on available-for-sale securities, net

Total other comprehensive income (loss)
Comprehensive income (loss)

Net income (loss) per share:

Basic

Diluted

Weighted-average common shares outstanding:

Basic

Diluted

2021

Years Ended December 31,
2020

2019

  $

470,347    $
470,347   

154,567 
154,567 

 $

51,833   
181,437   
79,333   
(2,236)  
310,367   
159,980   

719   
6,825   
(26,277)  
(18,733)  
141,247 
(13,407)  
127,840    $

(2,209)  
(2,209)  
125,631    $

35,714 
166,294 
63,817 
7,975 
273,800 
(119,233)

4,271 
9,723 
(771)
13,223 
(106,010)
(5,240)
(111,250)

(565)
(565)
(111,815)

 $

 $

3.01    $

2.91    $

(2.98)

(2.98)

 $

 $

42,438   

43,913   

37,281 

37,281 

  $

  $

  $

  $

35,233 
35,233 

8,241 
124,185 
51,815 
(10)
184,231 
(148,998)

2,951 
48,559 
— 
51,510 
(97,488)
2,755 
(94,733)

885 
885 
(93,848)

(2.58)

(2.58)

36,690 

36,690

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

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REGENXBIO INC.
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
(in thousands)

Balances at December 31, 2018
Adoption of ASU 2016-02 (Topic 842)
Adoption of ASU 2018-02
Vesting of restricted stock units
Exercise of stock options
Issuance of common stock under employee
   stock purchase plan
Stock-based compensation expense
Unrealized gain on available-for-sale securities, net
Net loss
Balances at December 31, 2019
Exercise of stock options
Issuance of common stock under employee
   stock purchase plan
Stock-based compensation expense
Unrealized loss on available-for-sale securities, net
Net loss
Balances at December 31, 2020
Issuance of common stock upon public offering,
   net of transaction costs of $14,194
Exercise of stock options, net of tax
Issuance of common stock under employee
   stock purchase plan
Stock-based compensation expense
Unrealized loss on available-for-sale securities, net
Net income
Balances at December 31, 2021

Common Stock

Shares

Amount

  Additional

Paid-in
Capital

  Accumulated  
Other
  Comprehensive  
  Income (Loss)  

  Accumulated  
Deficit

Total
  Stockholders’  
Equity

36,120    $
—   
—   
40   
796   

36   
—   
—   
—   
36,992   
428   

55   
—   
—   
—   
37,476   

4,899   
403   

54   
—   
—   
—   
42,831    $

4    $

592,580    $

—   
—   
—   
—   

—   
—   
—   
—   
4   
—   

—   
—   
—   
—   
4   

—   
—   

—   
—   
—   
—   

—   
—   
—   
7,062   

1,314   
26,854   
—   
—   
627,810   
5,623   

1,799   
31,949   
—   
—   
667,181   

216,059   
4,279   

1,768   
38,808   
—   
—   

4    $

928,095    $

(720)   $
—   
40   
—   
—   

(83,016)   $
(33)  
(40)  
—   
—   

—   
—   
885   
—   
205   
—   

—   
—   
(565)  
—   
(360)  

—   
—   

—   
—   
—   
(94,733)  
(177,822)  
—   

—   
—   
—   
(111,250)  
(289,072)  

—   
—   

—   
—   
(2,209)  
—   
(2,569)   $

—   
—   
—   
127,840   
(161,232)   $

508,848 
(33)
— 
— 
7,062 

1,314 
26,854 
885 
(94,733)
450,197 
5,623 

1,799 
31,949 
(565)
(111,250)
377,753 

216,059 
4,279 

1,768 
38,808 
(2,209)
127,840 
764,298

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

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REGENXBIO INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)

Cash flows from operating activities
Net income (loss)
Adjustments to reconcile net income (loss) to net cash provided by
   (used in) operating activities

Stock-based compensation expense
Depreciation and amortization
Provision for credit losses (recoveries)
Net amortization of premiums (accretion of discounts) on marketable debt securities
Net gains on investments
Imputed interest income from licensing
Non-cash interest expense
Other non-cash adjustments
Changes in operating assets and liabilities

Accounts receivable
Prepaid expenses
Other current assets
Operating lease right-of-use assets
Other assets
Accounts payable
Accrued expenses and other current liabilities
Deferred revenue
Operating lease liabilities
Other liabilities

Net cash provided by (used in) operating activities

Cash flows from investing activities
Purchases of marketable debt securities
Maturities of marketable debt securities
Sales of marketable debt securities
Sales of equity securities
Purchases of property and equipment

Net cash provided by (used in) investing activities

Cash flows from financing activities
Proceeds from exercise of stock options
Taxes paid related to net settlement of stock options
Proceeds from issuance of common stock under employee stock purchase plan
Proceeds from public offering of common stock, net of underwriting discounts
   and commissions
Issuance costs for public offering of common stock
Proceeds from sale of future royalties
Repayments under liability related to sale of future royalties, net of imputed interest
Transaction costs for sale of future royalties

Net cash provided by financing activities
Net increase (decrease) in cash and cash equivalents and restricted cash

Cash and cash equivalents and restricted cash
Beginning of period
End of period
Supplemental cash flow information
Cash paid (received) for income taxes
Cash paid for imputed interest under liability related to sale of future royalties
Supplemental disclosures of non-cash investing and financing activities
Increase in accounts payable and accrued liabilities related to purchases of property and equipment
Non-cash additions to property and equipment through tenant improvement allowance
Non-cash consideration received for licenses granted
Transaction costs for sale of future royalties in accounts payable and other current liabilities
Proceeds due to Company from sales of non-marketable equity securities

2021

Years Ended December 31,
2020

2019

  $

127,840 

 $

(111,250)

 $

(94,733)

38,808 
9,564 
(2,569)
5,842 
(5,189)
(360)
4,642 
79 

14,118 
(8,247)
(7,314)
4,866 
(2,272)
(2,304)
29,908 
(899)
12,073 
289 
218,875 

(498,144)
170,086 
— 
5,591 
(84,175)
(406,642)

4,281 
(2)
1,768 

216,438 
(379)
— 
(26,591)
(265)
195,250 
7,483 

339,756 
347,239 

5,996 
21,635 

558 
— 
— 
— 
600 

 $

 $
 $

 $
 $
 $
 $
 $

31,949 
8,407 
7,678 
1,083 
(4,918)
(2,163)
771 
163 

(9,898)
(4,030)
2,341 
3,219 
399 
3,873 
17,400 
— 
2,139 
(1,224)
(54,061)

(123,041)
233,468 
2,287 
36,914 
(26,869)
122,759 

5,623 
— 
1,799 

— 
— 
196,000 
— 
(3,208)
200,214 
268,912 

70,844 
339,756 

(191)
— 

6,812 
2,263 
1,123 
265 
— 

 $

 $
 $

 $
 $
 $
 $
 $

26,854 
7,152 
— 
(1,196)
(37,774)
(2,951)
— 
268 

(8,622)
(973)
(499)
2,431 
(2,694)
1,528 
6,882 
(600)
(2,255)
(523)
(107,705)

(190,735)
289,994 
— 
6,020 
(11,720)
93,559 

7,062 
— 
1,314 

— 
— 
— 
— 
— 
8,376 
(5,770)

76,614 
70,844 

904 
— 

1,572 
— 
— 
— 
—  

  $

  $
  $

  $
  $
  $
  $
  $

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

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Table of Contents

1. Nature of Business

REGENXBIO INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

REGENXBIO Inc. (the Company) is a clinical-stage biotechnology company seeking to improve lives through the curative potential of gene therapy.

The Company has developed a broad pipeline of gene therapy product candidates using its proprietary adeno-associated virus (AAV) gene delivery
platform (NAV Technology Platform), which consists of exclusive rights to over 100 novel AAV vectors, including AAV7, AAV8, AAV9 and AAVrh10. In
addition to its internal product development efforts, the Company also selectively licenses the NAV® Technology Platform to other leading biotechnology
and pharmaceutical companies (NAV Technology Licensees). As of December 31, 2021, the NAV Technology Platform was being applied by NAV
Technology Licensees in one commercially available product, Zolgensma®, and in the preclinical and clinical development of a number of licensed
products. Additionally, the Company has licensed intellectual property rights to collaborators for the joint development and commercialization of certain
product candidates. The Company was formed in 2008 in the State of Delaware and is headquartered in Rockville, Maryland.

As of December 31, 2021, the Company had generated an accumulated deficit of $161.2 million since inception. As the Company has incurred
cumulative losses since inception, transition to recurring profitability is dependent upon achieving a level of revenues adequate to support the Company’s
cost structure, which depends heavily on the successful development, approval and commercialization of its product candidates. The Company may never
achieve recurring profitability, and unless and until it does, the Company will continue to need to raise additional capital, to the extent possible. As of
December 31, 2021, the Company had cash, cash equivalents and marketable securities of $849.3 million, which management believes is sufficient to fund
operations for at least the next 12 months from the date these consolidated financial statements were issued.

2. Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United
States of America (GAAP) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have
been eliminated in consolidation.

Foreign Currency Transactions

The functional currency of the Company and its consolidated subsidiaries is the U.S. dollar. Transaction gains and losses that arise from exchange rate

fluctuations on transactions denominated in currencies other than the U.S. dollar are included in results of operations as incurred.

Use of Estimates

The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that
affect the reported amounts of assets, liabilities, revenues and expenses and related disclosure of contingent assets and liabilities for the periods presented.
Management bases its estimates on historical experience and various other factors that it believes are reasonable under the circumstances, the results of
which form the basis for making judgments about the carrying value of assets and liabilities, and other reported amounts, that are not readily apparent from
other sources. Actual results may differ materially from these estimates. Significant estimates are used in the following areas, among others: license and
royalty revenue, the allowance for credit losses, accrued research and development expenses and other accrued liabilities, stock-based compensation
expense, interest expense under the liability related to the sale of future royalties, income taxes and the fair value of financial instruments.

The Company is actively monitoring the impact of the COVID-19 pandemic on its business, results of operations and financial condition. The full
extent to which the COVID-19 pandemic will directly or indirectly impact the Company’s business, results of operations and financial condition in the
future is unknown at this time and will depend on future developments that are highly unpredictable. The most significant estimates affecting the
Company’s consolidated financial statements that may be impacted by the COVID-19 pandemic are related to the Company’s assessment of credit losses
on accounts receivable, contract assets and available-for-sale debt securities.

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Segment and Geographical Information

Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the

chief operating decision maker (CODM), or decision-making group, in making decisions on how to allocate resources and assess performance. The
Company’s CODM, its Chief Executive Officer, views the Company’s operations and manages the business as one operating segment.

The Company’s revenues consist of license and royalty revenue. For the year ended December 31, 2021, 79% and 7% of the Company’s revenues
were attributed to Bermuda and the U.S., respectively, and no other countries were attributed 10% or more of the Company’s revenues. For the year ended
December 31, 2020, 80% of the Company’s revenues were attributed to the U.S. and no other countries were attributed 10% or more of the Company’s
revenues. For the year ended December 31, 2019, 90% of the Company’s revenues were attributed to the U.S. and no other countries were attributed 10%
or more of the Company’s revenues. The country of origin for license revenue is determined based on the country of domicile of the licensee. The country
of origin for royalty revenue is determined based on the location of the underlying net sales of licensed products. The substantial majority of the
Company’s assets reside in the U.S.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with original maturities of 90 days or less at acquisition to be cash equivalents.

Restricted Cash

Restricted cash includes money market mutual funds and other deposits used to collateralize irrevocable letters of credit required under the

Company’s lease agreements and other certain agreements. The following table provides a reconciliation of cash and cash equivalents and restricted cash as
reported on the consolidated balance sheets to the total of these amounts as reported at the end of the period in the consolidated statements of cash flows (in
thousands):

Cash and cash equivalents
Restricted cash

Total cash and cash equivalents and restricted cash

Marketable Securities

2021

As of December 31,
2020

2019

  $

  $

345,209    $
2,030   
347,239    $

338,426    $
1,330   
339,756    $

69,514 
1,330 
70,844

Marketable securities consist of available-for-sale debt securities and equity securities and are carried at fair value. Marketable debt securities with
remaining maturity dates exceeding 12 months which are not intended to be sold prior to maturity for use in current operations are classified as non-current
assets. Marketable equity securities are classified as current assets.

Unrealized gains and losses on available-for-sale debt securities, net of any related tax effects, are excluded from results of operations and are
included in other comprehensive income (loss) and reported as a separate component of stockholders’ equity until realized. The Company uses the
aggregate portfolio approach to release the tax effects of unrealized gains and losses on available-for-sale debt securities in accumulated other
comprehensive loss. Purchase premiums and discounts on marketable debt securities are amortized or accreted into the cost basis over the life of the related
security as adjustments to the yield using the effective-interest method. Interest income is recognized when earned. Unrealized gains and losses on
marketable equity securities are included in results of operations as investment income. Realized gains and losses from the sale or maturity of marketable
securities are based on the specific identification method and are included in results of operations as investment income.

At each reporting date, the Company evaluates available-for-sale debt securities which have an amortized cost basis in excess of the fair value of the

security to determine if the unrealized loss or any potential credit losses should be recognized in results of operations. If the Company does not have the
intent and ability to hold the security until recovery of the unrealized loss, the difference between the fair value and amortized cost basis of the security is
charged to results of operations resulting in a new amortized cost basis of the security. If the Company has the intent and ability to hold the security until
recovery of the unrealized loss, the security is evaluated for potential credit losses. If a credit loss is deemed to exist, the credit loss is recognized in results
of operations and an allowance for credit losses is recorded against the amortized cost basis of the security. In determining whether a credit loss exists
related to impaired available-for-sale debt securities, the Company considers, among other factors, the extent of the unrealized loss relative to the amortized
cost basis, the credit rating of the issuer and any recent changes thereto, current and expected future

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economic conditions, and any adverse events or other changes in circumstances that have occurred which may indicate a potential credit loss. The
Company did not record an allowance for credit losses on its available-for-sale debt securities as of December 31, 2021 or 2020.

Accounts Receivable

Accounts receivable primarily consist of consideration due to the Company resulting from its license agreements with customers. Accounts receivable

include amounts invoiced to licensees as well as rights to consideration which have not yet been invoiced, including unbilled royalties, and for which
payment is conditional solely upon the passage of time. If a licensee elects to terminate a license prior to the end of the license term, the licensed
intellectual property is returned to the Company and any accounts receivable from the licensee which are not contractually payable to the Company are
charged off as a reduction of license revenue in the period of the termination. Accounts receivable which are not expected to be received by the Company
within 12 months from the reporting date are stated net of a discount to present value and recorded as non-current assets on the consolidated balance sheets.
The present value discount is recognized as a reduction of revenue in the period in which the accounts receivable are initially recorded and is accreted as
interest income from licensing over the term of the receivables.

Accounts receivable are stated net of an allowance for credit losses, if deemed necessary based on the Company’s evaluation of collectability and
potential credit losses. Management assesses the collectability of its accounts receivable using the specific identification of account balances, and considers
the credit quality and financial condition of its significant customers, historical information regarding credit losses and the Company’s evaluation of current
and expected future economic conditions. If necessary, an allowance for credit losses is recorded against accounts receivable such that the carrying value of
accounts receivable reflects the net amount expected to be collected. Accounts receivable balances are written off against the allowance for credit losses
when the potential for collectability is considered remote. Please refer to Note 10 for further information regarding the allowance for credit losses related to
accounts receivable.

Concentrations of Credit Risk and Off-balance Sheet Risk

Cash and cash equivalents, marketable debt securities and accounts receivable are financial instruments that are potentially subject to concentrations

of credit risk. The Company’s cash and cash equivalents are deposited in accounts at multiple financial institutions, and amounts may exceed federally
insured limits. The Company believes it is not exposed to significant credit risk due to the financial strength of the depository institutions in which the cash
and cash equivalents are held. The Company’s marketable debt securities consist of investment grade securities and may be subject to concentrations of
credit risk. The Company has adopted an investment policy which limits potential concentrations of investments and establishes minimum acceptable credit
ratings, thereby reducing credit risk exposure. With the exception of accounts receivable from Abeona Therapeutics Inc. (Abeona), as discussed further in
Note 10, the Company believes that it is not exposed to significant credit risk related to accounts receivable due to the credit quality and history of
collections from its significant customers, and the Company is unaware of any concentrations of credit risk related to accounts receivable from significant
customers with deteriorated credit quality. The Company has no financial instruments with off-balance sheet risk of loss.

The following table summarizes those customers who represented at least 10% of revenues or total net accounts receivable for the periods presented:

Customer A
Customer B
Customer C
Customer D
Customer E

*

Represented less than 10%

Revenues
Years Ended December 31,
2020

2019

2021

Accounts Receivable, Net
As of December 31,

2021

2020

* 

94%    

* 
* 
* 

* 

69%    

* 
13%  
10%  

* 

77%    
14%    

* 
* 

* 
44%
48%
* 
*

79%  
20%    

* 
* 
* 

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Leases

Effective January 1, 2019, the Company adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842) which supersedes the lease
accounting requirements in Accounting Standards Codification (ASC) 840, Leases (Topic 840). Please refer to Recent Accounting Pronouncements below
for additional information on the adoption of Topic 842 and the associated impact to the Company’s consolidated financial statements.

Under Topic 842, the Company classifies its leases as either finance or operating leases based on the principle of whether or not the lease is effectively

a financed purchase by the Company. Lease classification is evaluated at the inception of the lease agreement. Regardless of classification, the Company
records a right-of-use asset and a lease liability for all leases with a term greater than 12 months. All of the Company’s leases as of December 31, 2021 and
2020 have been classified as operating leases. Operating lease expense is recognized on a straight-line basis over the term of the lease, with the exception
of variable lease expenses which are recognized as incurred.

The Company identifies leases in its contracts if the contract conveys the right to control the use of identified property, plant or equipment for a period

of time in exchange for consideration. The Company does not allocate lease consideration between lease and nonlease components and records a lease
liability equal to the present value of the remaining fixed consideration under the lease. The interest rates implicit in the Company’s leases are generally not
readily determinable. Accordingly, the Company uses its estimated incremental borrowing rate at the commencement date of the lease to determine the
present value discount of the lease liability. The Company estimates its incremental borrowing rate for each lease based on an evaluation of its expected
credit rating and the prevailing market rates for collateralized debt in a similar economic environment with similar payment terms and maturity dates
commensurate with the term of the lease. The right-of-use asset for each lease is equal to the lease liability, adjusted for unamortized initial direct costs and
lease incentives and prepaid or accrued rent. Initial direct costs of entering into a lease are included in the right-of-use asset and amortized as lease expense
over the term of the lease. Lease incentives, such as tenant improvement allowances, are recorded as a reduction of the right-of-use asset and amortized as a
reduction of lease expense over the term of the lease. The Company excludes options to extend or terminate leases from the calculation of the lease liability
unless it is reasonably certain the option will be exercised.

Property and Equipment

Property and equipment is stated at cost less accumulated depreciation and amortization. Maintenance and repairs that do not improve or extend the

lives of the respective assets are expensed to operations as incurred. 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 and amortization is calculated using the straight-line method
over the estimated useful lives of the assets, which are as follows:

Computer equipment and software
Furniture and fixtures
Laboratory and manufacturing equipment
Leasehold improvements

Impairment of Long-lived Assets

Estimated Useful Life

3 years
5 years
5 to 15 years
Shorter of lease term or estimated useful life

The Company evaluates its long-lived assets for impairment when events or changes in circumstances indicate the carrying value of the assets may

not be recoverable. Recoverability is measured by comparison of the book values of the assets to estimated future net undiscounted cash flows that the
assets are expected to generate. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the book
value of the assets exceed their fair value, which is measured based on the projected discounted future net cash flows arising from the assets. No
impairment losses on long-lived assets were recorded during the years ended December 31, 2021, 2020 and 2019.

Non-marketable Equity Securities

The Company’s non-marketable equity securities consist of equity investments in other entities in which the Company’s ownership interest is below
20% and the Company does not have significant influence over the operations of the entity, or for which the equity securities are not common stock or in-
substance common stock. The Company’s non-marketable equity securities do not have readily determinable fair values and are measured at cost less
impairment, adjusted for observable price changes for identical or similar investments of the same issuer. Please refer to Note 4 for further information on
non-marketable equity securities.

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Fair Value of Financial Instruments

The Company is required to disclose information on all assets and liabilities reported at fair value that enables an assessment of the inputs used in

determining the reported fair values. ASC 820, Fair Value Measurements and Disclosures, establishes a hierarchy of inputs used in measuring fair value
that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the observable inputs be used when available.
Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of
the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the
asset or liability, and are developed based on the best information available in the circumstances. The fair value hierarchy applies only to the valuation
inputs used in determining the reported fair value of the investments and is not a measure of the investment credit quality. The three levels of the fair value
hierarchy are described below:

•

•

•

Level 1—Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to
access at the measurement date.

Level 2—Valuations based on quoted prices for similar assets or liabilities in markets that are not active or for which all significant inputs are
observable, either directly or indirectly.

Level 3—Valuations that require inputs that reflect the Company’s own assumptions that are both significant to the fair value measurement and
unobservable.

To the extent that 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 in
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. The fair values of the Company’s Level 2 instruments are based on quoted market prices or broker or dealer quotations for similar assets.
These investments are initially valued at the transaction price and subsequently valued utilizing third party pricing providers or other market observable
data. Please refer to Note 4 for further information on the fair value measurement of the Company’s financial instruments.

Liability Related to Sale of Future Royalties

As discussed in Note 7, the Company recorded a liability for the net proceeds received from the sale of its Zolgensma royalty payments to entities
managed by Healthcare Royalty Management, LLC (collectively, HCR). The liability is accounted for as debt since the return to HCR is explicitly capped
under the royalty purchase agreement, and is amortized over the estimated life of the arrangement using the effective interest method. The total amount of
royalty payments received by HCR under the agreement, less the net proceeds received by the Company, is recorded as interest expense over the life of the
arrangement. The Company estimates the effective interest rate based on its estimate of total royalty payments to be received by HCR under the agreement.
The Company reassesses these estimates at each reporting date and adjusts the effective interest rate and amortization of the liability on a prospective basis
as necessary.

Due to its continuing involvement in the underlying license agreement with Novartis Gene Therapies, Inc. (formerly AveXis, Inc.), the Company

continues to recognize royalty revenue on net sales of Zolgensma and records the royalty payments to HCR as a reduction of the liability when paid. As
such payments are made to HCR, the balance of the liability will be effectively repaid over the life of the royalty purchase agreement. The portion of the
liability related to the sale of future royalties which is expected to be amortized within 12 months of the reporting date is recorded as a current liability, with
the remaining portion of the liability recorded as a non-current liability.

Revenue Recognition

The Company recognizes revenue in accordance with ASC 606, Revenue from Contracts with Customers (Topic 606). Topic 606 requires entities to

recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the
entity expects to be entitled to in exchange for those goods or services. The following five steps are performed to determine the appropriate revenue
recognition for arrangements within the scope of Topic 606: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the
contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue
when (or as) the entity satisfies the performance obligations.

The Company applies the five-step model to contracts that are within the scope of Topic 606 only when it is probable that the Company will collect

the consideration it is entitled to in exchange for the goods or services it transfers to the customer. At contract

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inception, for contracts within the scope of Topic 606, the Company assesses the goods or services promised within each contract and determines those that
are performance obligations and whether each promised good or service is distinct. The Company then recognizes as revenue the amount of the transaction
price that is allocated to respective performance obligations when (or as) the respective performance obligations are satisfied.

The Company evaluates its contracts with customers for the presence of significant financing components. If a significant financing component is

identified in a contract and provides a financing benefit to the customer, the transaction price for the contract is adjusted to account for the financing
portion of the arrangement, which is recognized as interest income over the financing term using the effective interest method. In determining the
appropriate interest rates for significant financing components, the Company evaluates the credit profile of the customer and prevailing market interest
rates and selects an interest rate in which it believes would be charged to the customer in a separate financing arrangement over a similar financing term.

License and Royalty Revenue

The Company licenses its NAV Technology Platform and other intellectual property rights to other biotechnology and pharmaceutical companies,
including collaborators for the joint development and commercialization of its product candidates. The terms of the licenses vary, and licenses may be
exclusive or non-exclusive and may be sublicensable by the licensee. Licenses may grant intellectual property rights for purposes of internal and preclinical
research and development only, or may include the rights, or options to obtain future rights, to commercialize drug therapies for specific diseases using the
Company’s NAV Technology Platform and other licensed rights. License agreements generally have a term at least equal to the life of the underlying
patents, but are terminable at the option of the licensee. Consideration payable to the Company under its license agreements may include: (i) up-front and
annual fees, (ii) milestone payments based on the achievement of certain development and sales-based milestones, (iii) sublicense fees, (iv) royalties on
sales of licensed products and (v) other consideration payable upon optional goods and services purchased by licensees.

The Company’s license agreements are accounted for as contracts with customers within the scope of Topic 606, with the exception of transactions for

which the counterparty is determined not to be a customer. At the inception of each license agreement, the Company determines the contract term for
purposes of applying the requirements of Topic 606. Licenses are generally terminable at the option of the licensee with advance notice to the Company.
For each license granted, including licenses granted upon the exercise of license options, the Company evaluates these termination rights to determine
whether a substantive termination penalty would be incurred by the licensee upon termination. If the licensee incurs a substantive termination penalty upon
termination, the contract term for revenue recognition purposes is generally equal to the stated term of the license, which is the life of the underlying
licensed patents. Alternatively, if the licensee does not incur a substantive termination penalty upon termination, the contract term for revenue recognition
purposes may be shorter than the stated term of the license, in which case the termination rights may be accounted for as contract renewal options. The
determination of whether a substantive termination penalty is associated with the termination rights requires significant judgment. In making this
determination, the Company considers, among other things, the nature of the intellectual property rights that would be returned to the Company upon
termination, including the exclusivity of the licensed rights and the stage of development of the licensed products, the payment terms, including the amount
and timing of non-refundable or guaranteed payments, and the business purpose of the termination rights granted to the licensee. Generally, the most
significant judgment in determining whether a substantive termination penalty exists relates to the amount of any up-front or guaranteed non-refundable
payments relative to the amount of annual payments that may be avoided by the licensee upon termination of the license. The Company considers all of the
facts and circumstances relevant to each license when making this determination.

Performance obligations under the Company’s license agreements may include (i) the delivery of intellectual property licenses, (ii) options granted to
licensees to acquire additional licenses, to the extent the options represent material rights to the licensee, and (iii) research and development services to be
performed by the Company related to licensed products. License agreements may provide licensees with contract renewal options or options to acquire
additional licenses, goods or other services. Options are evaluated at the inception of the license agreement to determine whether they provide material
rights to the licensee. In making this determination, the Company considers whether the options are priced at an incremental discount to the standalone
selling price for the underlying licenses, goods or services, in which case the option is considered to be a material right to the licensee and is accounted for
as a separate performance obligation under the current license agreement. At the inception of each license agreement which contains performance
obligations for research and development services, the Company evaluates whether the license is distinct from the research and development services,
which requires judgment. In making this determination, the Company considers, among other things, the stage of development of the licensed products and
whether the research and development services will significantly impact further development of the licensed products. If it is determined that the license is
not distinct from the research and development services, the license is combined with the research and development services into a single performance
obligation.

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The Company evaluates the transaction price of its license agreements at the inception of each agreement and at each reporting date. The transaction

price includes the fixed consideration payable to the Company during the contract term, as well as any variable consideration to the extent that it is
probable that a significant reversal of revenue will not occur in the future. Fixed consideration under the license agreements includes up-front and annual
fees payable during the contract term. Variable consideration under the license agreements includes development and sales-based milestone payments,
sublicense fees and royalties on sales of licensed products. Consideration contingent upon the exercise of options by a licensee is excluded from the
transaction price and not accounted for as part of the license agreement until the option is exercised.

The transaction price for each license agreement is allocated to the underlying performance obligations based on their relative standalone selling
prices and recognized as revenue when (or as) the performance obligations are satisfied. Consideration allocated to performance obligations for the delivery
of an intellectual property license is recognized as revenue in full upon the delivery of the license to the licensee. Consideration allocated to performance
obligations for license options is recognized as revenue in full upon the earlier of the option exercise or expiration. The exercise of a license option by a
licensee is accounted for as a new license for revenue recognition purposes. Consideration allocated to performance obligations for research and
development services is recognized as revenue as the services are performed by the Company.

Up-front and annual licenses fees payable to the Company over the contract term of each license are included in the transaction price, and the portion

of this consideration allocated to the performance obligation for the delivery of the intellectual property license is recognized as revenue in full upon the
delivery of the license to the licensee. If annual license fees are payable to the Company in periods beyond 12 months from the delivery of the license, a
significant financing component is deemed to exist which provides a financing benefit to the licensee. If a significant financing component is identified, the
Company adjusts the transaction price for the license to include only the present value of the annual license fees payable to the Company over the contract
term. The discounted portion of the license fees is recognized as interest income from licensing over the financing period of the license.

Development milestone payments are payable to the Company upon the achievement of specified development milestones. At the inception of each
license agreement that contains development milestone payments, the Company evaluates whether the milestones are considered probable of achievement
and estimates the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal
will not occur in the future, milestone payments are included in the transaction price and recognized as revenue upon the delivery of the license. Milestone
payments contingent on the achievement of development milestones that are not within the control of the Company or the licensee, such as regulatory
approvals, are not considered probable of being achieved and are excluded from the transaction price until the milestone is achieved. At each reporting date,
the Company re-evaluates the probability of achievement of each outstanding development milestone and, if necessary, adjusts the transaction price for any
milestones for which the probability of achievement has changed due to current facts and circumstances. Any such adjustments are recorded on a
cumulative catch-up basis and recognized as revenue in the period of the adjustment.

Royalties on sales of licensed products, sales-based milestone payments, including milestones payable upon first commercial sales of licensed

products, and sublicense fees based on the receipt of certain fees by licensees from any sublicensees are excluded from the transaction price of each license
and recognized as revenue in the period that the related sales or sublicenses occur, provided that the associated license has been delivered to the licensee.

Royalty revenue to date consists primarily of royalties on net sales of Zolgensma, which is a licensed product under the Company’s license agreement

with Novartis Gene Therapies, Inc. (formerly AveXis, Inc.) (Novartis Gene Therapies), a wholly owned subsidiary of Novartis AG (Novartis), for the
development and commercialization of treatments for spinal muscular atrophy (SMA). The Company recognizes royalty revenue from net sales of
Zolgensma in the period in which the underlying products are sold by Novartis Gene Therapies, which in certain cases may require the Company to
estimate royalty revenue for periods of net sales which have not yet been reported to the Company. Estimated royalties are reconciled to actual amounts
reported in subsequent periods, and any differences are recognized as an adjustment to royalty revenue in the period the royalties are reported. Sales-based
milestone payments related to net sales of Zolgensma are recognized as royalty revenue in the period in which the milestone is achieved.

The Company receives payments from licensees based on the billing schedules established in each license agreement. Amounts recognized as revenue

which have not yet been received from licensees, including unbilled royalties, are recorded as accounts receivable when the Company’s rights to the
consideration are conditional solely upon the passage of time. Amounts recognized as revenue which have not yet been received from licensees are
recorded as contract assets when the Company’s rights to the consideration are not unconditional. Contract assets are recorded as other current assets on the
consolidated balance sheets if the consideration is expected to be realized within 12 months from the reporting date, or as other assets if the consideration is
expected to be realized in periods beyond 12 months from the reporting date. If a licensee elects to terminate a license prior to the end of the license term,
the licensed intellectual property is returned to the Company and any consideration recorded as accounts receivable or contract assets which is not
contractually payable by the licensee is charged off as a reduction of license revenue in the period of the

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termination. Amounts received by the Company prior to the delivery of underlying performance obligations are deferred and recognized as revenue upon
the satisfaction of the performance obligations by the Company. Deferred revenue which is not expected to be recognized within 12 months from the
reporting date is recorded as non-current on the consolidated balance sheets.

Collaborative Arrangements

The Company evaluates its agreements with collaboration partners to determine whether they are within the scope of ASC 808, Collaborative

Arrangements (Topic 808). Such arrangements are within the scope of Topic 808 if they involve joint operating activities performed by parties that are both
active participants in the activities and exposed to significant risks and rewards dependent on the commercial success of such activities. This evaluation is
performed throughout the life of the arrangement based on any changes in the roles and responsibilities of the parties under the arrangement. For
collaboration arrangements within the scope of Topic 808 that contain multiple elements, the Company identifies the various transactions with the
counterparty and determines if any unit of account is more reflective of a transaction with a customer and therefore should be accounted for within the
scope of Topic 606. For transactions that are accounted for pursuant to Topic 808, an appropriate method of recognition and presentation is determined and
consistently applied. For transactions that are accounted for pursuant to Topic 606, the Company applies the five-step model as described in its revenue
recognition policies.

For transactions accounted for as collaborative arrangements under Topic 808, payments to and from collaboration partners associated with multiple

activities in a collaboration arrangement are classified based on the nature of each separate activity. Payments associated with development activities
performed are recorded as research and development expense when owed to collaboration partners, or as a reduction of research and development expense
when due from collaboration partners. Payments associated with commercialization activities performed are recorded as general and administrative expense
when owed to collaboration partners, or as a reduction of general and administrative expense when due from collaboration partners. At the end of each
reporting period, the Company records a net amount due to or from collaboration partners for activities performed by the parties under the collaboration.

Cost of Revenues

Cost of revenues consists primarily of sublicense fees, milestone payments and royalties on net sales of licensed products as specified in the
Company’s agreements with its licensors. Sublicense fees are based on a percentage of license fees received by the Company from licensees and are
recognized in the period that the underlying revenue is recognized. Milestone payments are payable to licensors upon the achievement of specified
milestones by licensees and are recognized in the period the milestone is achieved or deemed probable of achievement. Royalties are based on a percentage
of net sales of licensed products by licensees and are recognized in the period that the underlying sales occur. Amounts which are payable to licensors in
periods beyond 12 months from the reporting date are recorded as non-current liabilities on the consolidated balance sheets.

Research and Development Expenses

Research and development costs are expensed as incurred in performing research and development activities. Advance payments for goods or services

related to research and development activities are deferred and expensed as the goods are delivered or the services are performed. Research and
development costs include salaries, wages, benefits and other personnel costs, laboratory and facilities costs, allocated overhead costs, license and
milestone fees, and costs of goods and services associated with preclinical research and clinical trial activities, associated manufacturing-related activities,
regulatory activities and other related services performed by third-parties. At the end of each reporting period, the Company compares payments made to
third-party service providers to the estimated expenses incurred based on the services provided and progress toward completion of the research or
development objectives. Such estimates are subject to change as additional information becomes available. Depending on the timing of payments to the
service providers and the estimated expenses incurred, the Company may record net prepaid or accrued research and development expenses relating to
these costs. Up-front fees incurred in obtaining technology licenses, as well as milestone payments to licensors, are charged to research and development
expense as incurred if the technology licensed has no alternative future use.

Stock-based Compensation

The Company accounts for its stock-based compensation awards in accordance with ASC 718, Compensation—Stock Compensation. ASC 718

requires all stock-based awards to employees and nonemployees to be recognized as expense based on the grant date fair value of the awards. The
Company’s stock-based awards include stock options granted to employees and nonemployees, restricted stock units granted to employees and shares
issued to employees under its employee stock purchase plan.

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The Company’s stock-based awards may be subject to either service or performance-based vesting conditions. Compensation expense related to

awards with service-based vesting conditions is recognized on a straight-line basis based on the estimated grant date fair value over the requisite service
period of the award, which is generally the vesting term. Compensation expense related to awards with performance-based vesting conditions is recognized
based on the estimated grant date fair value over the requisite service period using the accelerated attribution method to the extent achievement of the
performance condition is probable.

The Company has elected to not estimate forfeitures of stock-based awards and accounts for forfeitures as they occur.

The Company estimates the fair value of its stock option awards using the Black-Scholes option-pricing model, which requires the input of subjective

assumptions, including (i) the fair value of the underlying common stock, (ii) the expected stock price volatility, (iii) the expected term of the award, (iv)
the risk-free interest rate and (v) expected dividends. For reporting periods through December 31, 2020, the Company did not have sufficient historical or
implied volatility data for its common stock necessary to estimate expected volatility over a period of time commensurate with the expected term of its
stock option awards. For such reporting periods, the Company estimated expected volatility based on a weighted-average of the historical volatility of its
common stock and the common stock of a selected peer group of similar publicly traded companies for which sufficient historical volatility data was
available. As more historical trading data became available over time, the Company gradually increased the weight placed on the historical volatility of its
common stock versus the historical peer group volatility data. Effective January 1, 2021, the Company eliminated the use of historical peer group volatility
data and now estimates expected volatility based solely on the historical volatility of its common stock given that sufficient historical volatility data has
become available. The Company estimates the expected term of its employee stock options using the “simplified” method, whereby the expected term
equals the arithmetic average of the vesting term and the original contractual term of the option, due to its lack of sufficient historical data. For stock
options granted to nonemployees, the Company uses the contractual term of the award rather than expected term to estimate the fair value of the award.
The Company estimates the risk-free interest rates for periods within the expected term of its options based on the rates of U.S. Treasury securities with
maturity dates commensurate with the expected term of the associated awards. The Company assumes a dividend yield of zero for its common stock as it
has never paid dividends and does not expect to pay dividends for the foreseeable future.

The Company estimates the fair value of restricted stock units based on the fair value of the Company’s common stock on the date of the grant.

Income Taxes

Income taxes are accounted for in accordance with ASC 740, Income Taxes, which provides for deferred taxes using an asset and liability approach.
The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated
financial statements or tax returns. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases
of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are provided, if
based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

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.

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2021 and 2020, 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).

Net Income (Loss) Per Share

Basic net income (loss) per share is calculated by dividing net income (loss) applicable to common stockholders by the weighted-average common
shares outstanding during the period, without consideration for common stock equivalents. Diluted net income (loss) per share is calculated by adjusting
the weighted-average common shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the
treasury-stock method. Contingently convertible shares in which conversion is based on non-market-priced contingencies are excluded from the
calculations of both basic and diluted net income (loss) per share until the contingency has been fully met. For purposes of the diluted net income (loss) per
share calculation, common stock equivalents are excluded from the calculation of diluted net income (loss) per share if their effect would be anti-dilutive.

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Comprehensive Income (Loss)

Comprehensive income (loss) includes net income (loss) as well as unrealized gains and losses on available-for-sale debt securities, net of income tax

effects and reclassification adjustments for realized gains and losses.

Correction of Previously Issued Financial Statements

During the quarter ended December 31, 2021, the Company identified an immaterial error in the presentation of payments made under the liability
related to the sale of future royalties in the consolidated statements of cash flows for the three months ended March 31, 2021, six months ended June 30,
2021 and nine months ended September 30, 2021. Payments made under the liability related to the sale of future royalties were presented as cash outflows
from financing activities in the interim financial statements for these periods. Upon further review, the Company determined that the amount of these
payments attributable to imputed interest expense should be presented as cash outflows from operating activities, and only the amount attributable to
principal repayments should be presented as cash outflows from financing activities. The amounts previously reported as cash outflows from financing
activities which should have been reported as cash outflows from operating activities were $2.9 million for the three months ended March 31, 2021, $9.1
million for the six months ended June 30, 2021 and $15.3 million for the nine months ended September 30, 2021. The Company evaluated the materiality
of these errors from both a quantitative and qualitative perspective and concluded that they were immaterial to the aforementioned previously issued
interim financial statements taken as a whole. The Company has corrected the presentation of these cash flows in the accompanying consolidated statement
of cash flows for the year ended December 31, 2021. The error in presentation did not have an impact on the financial statements for any periods prior to
2021, and did not have an impact on the previously reported assets, liabilities, stockholders’ equity or results of operations for the interim periods ended
March 31, 2021, June 30, 2021 and September 30, 2021. Although the Company has determined that this error was not material to its previously issued
interim financial statements for 2021, the Company is revising the previously issued interim financial statements to correct for such error, which revision
will be effected in connection with its future filings of Form 10-Q for interim periods in 2022. The accompanying consolidated financial statements for the
year ended December 31, 2021 reflect the as corrected annualized impact of correcting the error.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326):

Measurement of Credit Losses on Financial Instruments, which amends the accounting for credit losses for most financial assets and certain other
instruments. The standard requires that entities holding financial assets that are not accounted for at fair value through net income be presented at the net
amount expected to be collected by recording an allowance for credit losses. The allowance for credit losses will be a valuation account that will be
deducted from the amortized cost basis of the financial asset to present the net carrying value at the amount expected to be collected on the financial
asset. The standard also amends the impairment model for available-for-sale debt securities, requiring credit losses on impaired debt securities to be
included in results of operations. The Company adopted this standard effective January 1, 2020 using a modified retrospective transition method, which
requires a cumulative-effect adjustment, if any, to opening accumulated deficit on the adoption date. The adoption of this standard primarily impacts the
Company’s methodology used to assess credit losses on its accounts receivable, contract assets and available-for-sale debt securities. Based on the
composition of the Company’s accounts receivable, contract assets and available-for-sale debt securities, the adoption of this standard required no
cumulative-effect adjustments and did not have a material impact on the Company’s financial position or results of operations. Please refer to the
significant accounting policies above for a description of the Company’s accounting policies for accounts receivable and marketable securities upon the
adoption of this standard.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure

Requirements for Fair Value Measurement, which modifies certain disclosure requirements regarding fair value measurements. The Company adopted this
standard effective January 1, 2020. The adoption of this standard did not have a material impact on the Company’s financial statement disclosures.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s

Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The standard aligns the requirements for
capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs
incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The Company adopted this
standard effective January 1, 2020 on a prospective basis. The Company has various cloud-based software applications accounted for as service contracts,
the most significant of which is the Company’s enterprise resource planning (ERP) system for which implementation was in progress on the adoption date
of this standard. The adoption of this standard resulted in the capitalization of certain costs during the years ended December 31, 2021 and 2020 related to
the implementation of the ERP system and other cloud-based software applications which would have been expensed as incurred prior to the adoption of
this standard. Once implementation activities are substantially complete and the cloud-based application is ready for its intended use, capitalization of
implementation costs ceases and amounts capitalized are amortized on a straight-line basis over the term of the hosting arrangement. Capitalized
implementation costs for cloud-based applications are classified on the consolidated balance sheets and statements of operations and comprehensive
income (loss) in the same manner as the costs of the associated hosting arrangement. As of December 31, 2021 and 2020, the Company had recorded
capitalized costs, net of amounts amortized, of $3.3 million and $1.6 million, respectively, related to the implementation of cloud-based software
applications accounted for as service contracts, which were included in prepaid expenses and other assets in the consolidated balance sheets. Amortization
of capitalized implementation costs for cloud-based applications recorded for the years ended December 31, 2021 and 2020 was $0.6 million and $0.1
million, respectively, and was in included in general and administrative expenses in the consolidated statements of operations and comprehensive income
(loss).

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In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740)—Simplifying the Accounting for Income Taxes, which simplifies the

current accounting for income taxes. Among other changes, the standard removes the exception to the incremental approach for intraperiod tax allocation
when there is a loss from continuing operations and income or a gain from other items such as other comprehensive income. The Company early adopted
this standard effective January 1, 2020, with certain aspects of the standard applied using the modified retrospective transition method and other aspects of
the standard applied on a prospective basis. The adoption of this standard required no cumulative-effect adjustments and did not have a material impact on
the Company’s financial position or results of operations.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) which supersedes the lease accounting requirements in ASC 840, Leases (Topic

840). Effective January 1, 2019, the Company adopted Topic 842 using the modified retrospective transition method. Under this method, the Company
applied Topic 842 to all leases in effect as of, or entered into after, January 1, 2019 and recorded the cumulative impact of the adoption as an adjustment to
its accumulated deficit on January 1, 2019. The cumulative impact of the adoption of Topic 842 resulted in an increase in accumulated deficit of less than
$0.1 million on January 1, 2019. The adoption of Topic 842 did not have a material impact on the Company’s results of operations for years ended
December 31, 2021, 2020 and 2019, nor does the Company believe it will have a material impact on future results of operations based on its current leasing
arrangements. Please refer to the significant accounting policies above for a description of the Company’s lease accounting policies upon the adoption on
Topic 842.

In February 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax
Effects from Accumulated Other Comprehensive Income, which amends the previous guidance on comprehensive income to provide an option for an entity
to reclassify the stranded tax effects of the Tax Cuts and Jobs Act of 2017 (the TCJA) that was signed into law in December 2017 from accumulated other
comprehensive income directly to retained earnings. The stranded tax effects result from the remeasurement of deferred tax assets and liabilities which
were originally recorded in comprehensive income but whose remeasurement is reflected in the income statement. The Company adopted this standard
effective January 1, 2019, and upon adoption recorded a cumulative adjustment of less than $0.1 million to reclassify the stranded tax effects of unrealized
gains and losses on available-for-sale securities from accumulated other comprehensive income (loss) to accumulated deficit. The adoption of this standard
did not have a material impact on the Company’s financial position or results of operations.

3. Marketable Securities

The following tables present a summary of the Company’s marketable securities, which consist solely of available-for-sale debt securities (in

thousands):

December 31, 2021

U.S. government and agency securities
Certificates of deposit
Corporate bonds

  Amortized Cost    

Unrealized
Gains

Unrealized
Losses

Fair Value

  $

  $

60,118    $
2,936     
442,792     
505,846    $

—    $
2     
62     
64    $

(229)   $
(11)    
(1,533)    
(1,773)   $

59,889 
2,927 
441,321 
504,137

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December 31, 2020

U.S. government and agency securities
Certificates of deposit
Corporate bonds
Municipal securities

  Amortized Cost    

Unrealized
Gains

Unrealized
Losses

Fair Value

  $

  $

12,782    $
1,956     
165,850     
3,035     
183,623    $

22    $
34     
497     
2     
555    $

—    $
—     
(55)    
—     
(55)   $

12,804 
1,990 
166,292 
3,037 
184,123

As of December 31, 2021 and 2020, no available-for-sale debt securities had remaining maturities greater than three years. The amortized cost of

marketable debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, or to the earliest call date for callable debt
securities purchased at a premium.

As of December 31, 2021 and 2020, the balance in accumulated other comprehensive loss consisted solely of unrealized gains and losses on available-

for-sale debt securities, net of reclassification adjustments for realized gains and losses and income tax effects. Unrealized gain (loss) on available-for-sale
securities, net, presented in the statements of operations and comprehensive income (loss) consisted of the following (in thousands):

Unrealized gain (loss) before reclassifications
Realized gains reclassified to investment income
Income tax expense

Unrealized gain (loss) on available-for-sale securities, net

2021

Years Ended December 31,
2020

2019

  $

  $

(2,202)   $
(7)  
—   
(2,209)   $

(426)  $
(139)   
— 
(565)  $

1,392 
(40)
(467)
885

The following tables present the fair values and unrealized losses of available-for-sale debt securities held by the Company in an unrealized loss

position for less than 12 months and 12 months or greater (in thousands):

December 31, 2021

U.S. government and agency securities
Certificates of deposit
Corporate bonds

December 31, 2020
Corporate bonds

Less than 12 Months

12 Months or Greater

Total

Fair Value

Unrealized
Losses

Fair Value

Unrealized
Losses

Fair Value

Unrealized
Losses

  $

  $

59,889    $
2,195 
385,115 
447,199    $

(229)   $
(11)   
(1,533)   
(1,773)   $

—    $
— 
— 
—    $

—    $
— 
— 
—    $

59,889    $
2,195 
385,115 
447,199    $

(229)
(11)
(1,533)
(1,773)

Less than 12 Months

12 Months or Greater

Total

Fair Value

Unrealized
Losses

Fair Value

Unrealized
Losses

Fair Value

Unrealized
Losses

  $
  $

55,507    $
55,507    $

(55)   $
(55)   $

—    $
—    $

—    $
—    $

55,507    $
55,507    $

(55)
(55)

As of December 31, 2021, available-for-sale debt securities held by the Company which were in an unrealized loss position consisted of 92
investment grade security positions. The Company has the intent and ability to hold such securities until recovery, and based on the credit quality of the
issuers and low severity of each unrealized loss position relative to its amortized cost basis, the Company did not identify any credit losses associated with
its available-for-sale debt securities. The Company did not recognize any impairment or credit losses on available-for-sale debt securities during the years
ended December 31, 2021, 2020 and 2019.

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During the years ended December 31, 2020 and 2019, the Company recognized total net realized and unrealized gains of $4.8 million and $37.8
million, respectively, related to its marketable equity securities of Prevail Therapeutics Inc. (Prevail). The Prevail securities were acquired as consideration
for a license to the NAV Technology Platform granted to Prevail in August 2017. Prevail completed its initial public offering (IPO) in June 2019, prior to
which the securities were accounted for as non-marketable equity securities without a readily determinable fair value and had a carrying value of $0.4
million. Upon Prevail’s IPO in June 2019, the securities were reclassified to marketable securities and remeasured at fair value at each subsequent reporting
date. As of December 31, 2020, the Company had sold all of its Prevail equity securities.

4. Fair Value of Financial Instruments

Financial instruments reported at fair value on a recurring basis include cash equivalents and marketable securities. The following tables present the

fair value of cash equivalents and marketable securities in accordance with the hierarchy discussed in Note 2 (in thousands):

December 31, 2021
Cash equivalents:

Money market mutual funds
Total cash equivalents

Marketable securities:

U.S. government and agency securities
Certificates of deposit
Corporate bonds

Total marketable securities
Total cash equivalents and marketable securities

December 31, 2020
Cash equivalents:

Money market mutual funds
Total cash equivalents

Marketable securities:

U.S. government and agency securities
Certificates of deposit
Corporate bonds
Municipal securities

Total marketable securities
Total cash equivalents and marketable securities

Quoted
prices
in active
markets
(Level 1)

Significant
other
observable
inputs
(Level 2)

Significant

unobservable    

inputs
(Level 3)

Total

—    $
—     

—     
—     
—     
—     
—    $

236,340    $
236,340     

59,889     
2,927     
441,321     
504,137     
740,477    $

—    $
—     

—     
—     
—     
—     
—    $

236,340 
236,340 

59,889 
2,927 
441,321 
504,137 
740,477

Quoted
prices
in active
markets
(Level 1)

Significant
other
observable
inputs
(Level 2)

Significant

unobservable    

inputs
(Level 3)

Total

—    $
—     

—     
—     
—     
—     
—     
—    $

96,307    $
96,307     

12,804     
1,990     
166,292     
3,037     
184,123     
280,430    $

—    $
—     

—     
—     
—     
—     
—     
—    $

96,307 
96,307 

12,804 
1,990 
166,292 
3,037 
184,123 
280,430

  $

  $

  $

  $

Management estimates that the carrying amounts of its current accounts receivable, other current assets, accounts payable, accrued expenses and other

current liabilities approximate fair value due to the short-term nature of those instruments. Accounts receivable which contain non-current portions are
recorded at their present values using a discount rate that is based on prevailing market rates and the credit profile of the licensee on the date the amounts
are initially recorded. Management does not believe there have been any significant changes in market conditions or credit quality that would cause the
discount rates initially used to be materially different from those that would be used as of December 31, 2021 to determine the present value of the
receivables. Accordingly, management estimates that the carrying value of its non-current accounts receivable approximates the fair value of those
instruments. Management estimates that the carrying value of the liability related to the sale of future royalties approximates fair value. As discussed in
Note 7, the carrying value of the liability related to the sale of future royalties is based on the Company’s estimate of future royalty payments expected to
be paid to HCR over the life of the arrangement, which are considered Level 3 inputs.

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Non-marketable Equity Securities

Non-marketable equity securities are measured at cost less impairment, adjusted for observable price changes for identical or similar investments of

the same issuer. As of December 31, 2021, the Company did not hold any non-marketable equity securities. As of December 31, 2020, non-marketable
equity securities had a carrying value of $1.1 million and were included in other assets on the consolidated balance sheet. The Company did not identify
any observable price changes or changes in circumstances that would have had an adverse effect on the fair value of the securities as of December 31,
2020. No remeasurements or impairment losses were recorded on non-marketable equity securities during the years ended December 31, 2021, 2020 and
2019.

The Company’s non-marketable equity securities as of December 31, 2020 consisted solely of equity securities of Corlieve Therapeutics SAS

(Corlieve), which were acquired in June 2020 as consideration under a license and collaboration agreement with Corlieve. In July 2021, Corlieve was
acquired by uniQure N.V. (uniQure). In exchange for its ownership in Corlieve, the Company received sales proceeds of €4.8 million ($5.6 million) from
uniQure and is entitled to receive additional proceeds of €0.5 million ($0.6 million as of December 31, 2021) by July 2022. The Company recorded a
realized gain of $5.2 million during the year ended December 31, 2021 as a result of the acquisition of its Corlieve securities by uniQure, which is included
in investment income in the consolidated statements of operations and comprehensive income (loss). In connection with the acquisition, the Company is
also eligible to receive payments of up to €37.1 million ($42.1 million as of December 31, 2021) from uniQure contingent upon the achievement of various
development and regulatory milestones, none of which have been recognized in the consolidated financial statements as of December 31, 2021. Proceeds
contingent upon the achievement of these milestones will be recognized as investment income in the period in which any uncertainty regarding realization
is substantially resolved, which may not occur until the achievement of the underlying milestones. It is at least reasonably possible that some or all of the
proceeds contingent upon these milestones will not be realized by the Company.

5. Property and Equipment, Net

Property and equipment, net consists of the following (in thousands):

Laboratory and manufacturing equipment
Computer equipment and software
Furniture and fixtures
Leasehold improvements

Total property and equipment

Accumulated depreciation and amortization

Property and equipment, net

As of December 31,

2021

2020

  $

  $

56,976    $
4,268   
6,804   
92,535   
160,583   
(29,036)  
131,547    $

26,306 
3,764 
4,114 
44,957 
79,141 
(22,674)
56,467

During the years ended December 31, 2021, 2020 and 2019, the Company recorded depreciation and amortization expense of $9.6 million, $8.4

million and $7.2 million, respectively.

6. Leases

9804 Medical Center Drive

In November 2018, the Company entered into an operating lease, as amended from time to time, for approximately 186,000 square feet of office,
laboratory and manufacturing facilities at a new building to be constructed at 9804 Medical Center Drive in Rockville, Maryland (the 9804 Medical Center
Drive Lease), which will serve as the Company’s corporate, research and manufacturing headquarters. The initial construction of the building was
performed by the landlord and the lease commenced in September 2020 upon delivery of the leased premises to the Company to make additional
improvements to the building. Monthly payments under the lease began in September 2021 and escalate annually in accordance with the lease agreement.
The lease expires in September 2036, subject to extension and termination options held by the Company. The Company has the option to extend the term of
the lease for up to 10 additional years and the option to terminate the lease, with payment of an early termination fee, after 12 years from the delivery of the
leased premises to the Company. As of December 31, 2021, the Company’s extension and termination options under the 9804 Medical Center Drive Lease
have been excluded from the measurement of the right-of-use assets and lease liabilities as they were not reasonably certain of exercise. As required by the
lease agreement, the Company has provided the landlord with an irrevocable letter of credit of $1.1 million which the landlord may draw upon in the event
of any uncured default by the Company under the terms of the lease.

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Pursuant to the 9804 Medical Center Drive Lease, the Company received a $19.5 million tenant improvement allowance from the landlord to perform

improvements to the leased premises. The tenant improvement allowance has been recorded as a reduction of the right-of-use assets for the lease and is
amortized on a straight-line basis as a reduction of lease expense over the term of the lease. As of December 31, 2021, the Company had unreimbursed
amounts remaining under the tenant improvement allowance of $1.5 million, which were deemed in-substance lease payments and recorded as a reduction
of the lease liability. The Company began occupation of a portion of the facility in 2021, while the buildout of the remaining portion of the building,
including the manufacturing facility, is expected to be completed in the first half of 2022. As of December 31, 2021, the Company had recorded property
and equipment at cost of $113.2 million related to the buildout at 9804 Medical Center Drive, of which $41.2 million was placed in service upon the initial
occupation of the building in 2021 and $72.0 million, primarily related to the manufacturing facility, has not yet been placed in service.

The Company recorded the right-of-use assets and lease liabilities related to the 9804 Medical Center Drive Lease upon its commencement in
September 2020. As of December 31, 2021, the Company had recorded right-of-use assets of $48.3 million and lease liabilities of $72.5 million related to
the 9804 Medical Center Drive Lease.

9712 Medical Center Drive

In March 2015, the Company entered into an operating lease for office space at 9712 Medical Center Drive in Rockville, Maryland (the 9712 Medical

Center Drive Lease). The lease term commenced in April 2015, and monthly payments under the lease began in October 2015 and escalate annually in
accordance with the lease agreement.

The 9712 Medical Center Drive Lease has been amended from time to time to include additional office and laboratory space at an adjacent building
located at 9714 Medical Center Drive and extend the term of the lease. In October 2020, the 9712 Medical Center Drive Lease was amended to extend the
lease term from September 2021 to February 2027, subject to extension options held by the Company. The October 2020 amendment resulted in a $7.2
million increase in the right-of-use assets and lease liabilities under the 9712 Medical Center Drive Lease. The Company has an option to extend the term
of the lease for three additional years, as well as an option to extend the lease term to be coterminous with the 9804 Medical Center Drive Lease, which
expires in September 2036. As of December 31, 2021, the Company’s extension options under the 9712 Medical Center Drive Lease have been excluded
from the measurement of the right-of-use assets and lease liabilities as they were not reasonably certain of exercise. The Company received a $0.4 million
tenant improvement allowance from the landlord which has been recorded as a reduction of the right-of-use assets for the lease and is amortized on a
straight-line basis as a reduction of lease expense over the term of the lease.

400 Madison Avenue

In May 2016, the Company entered into an operating lease for office space at 400 Madison Avenue in New York, New York (the 400 Madison Lease).

The lease term commenced in July 2016, and monthly payments under the lease began in October 2016 and escalate annually in accordance with the lease
agreement. In May 2019, the 400 Madison Lease was amended to include additional office space and extend the lease term from October 2020 to April
2027. The May 2019 amendment resulted in a $5.2 million increase in the right-of-use assets and lease liabilities under the 400 Madison Lease. The
Company received a $0.7 million tenant improvement allowance from the landlord which has been recorded as a reduction of the right-of-use assets for the
lease and is amortized on a straight-line basis as a reduction of lease expense over the term of the lease. As required by the lease agreement, the Company
has provided the landlord with an irrevocable letter of credit of $0.2 million which the landlord may draw upon in the event of any uncured default by the
Company under the terms of the lease.

9600 Blackwell Road

In November 2020, the Company exercised its termination option under the operating lease for its former corporate headquarters at 9600 Blackwell

Road in Rockville, Maryland (the 9600 Blackwell Road Lease). Upon exercise of the termination option, the Company was obligated to pay an early
termination fee of $0.4 million and the lease term was reduced from September 2023 to September 2021. The exercise of the termination option in
November 2020 resulted in a $0.7 million decrease in the right-of-use assets and lease liabilities under the 9600 Blackwell Road Lease, and the lease was
terminated upon its expiration in September 2021.

Other Leases

The Company leases additional laboratory and other equipment under operating leases with various expiration dates through 2028, including leases

which have been executed but have not yet commenced.

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Operating Lease Information

All of the Company’s leases are classified as operating leases. The following table summarizes the Company’s lease costs and supplemental cash flow

information related to its operating leases (in thousands):

Operating lease cost
Variable lease cost
Total lease cost

Cash paid (received) for amounts included in
   operating lease liabilities
Right-of-use assets acquired through operating
   lease liabilities

2021

Years Ended December 31,
2020

2019

9,729    $
2,348   
12,077    $

5,246    $
1,104   
6,350    $

(6,765)   $

(678)   $

1,955    $

56,956    $

3,040 
666 
3,706 

2,724 

5,114

$

  $

$

$

Cash received for amounts included in operating lease liabilities for the years ended December 31, 2021 and 2020 includes $11.4 million and $5.0

million, respectively, received by the Company during the period under its tenant improvement allowances, which were deemed in-substance lease
payments and included in the calculation of the lease liability. Right-of-use assets acquired through operating lease liabilities for the years ended December
31, 2020 and 2019 include additions and reductions to right-of-use assets resulting from lease modifications and changes in lease term. Short-term lease
expense for the years ended December 31, 2021, 2020 and 2019 was not material and is included in operating lease cost in the table above. Variable lease
cost under the Company’s operating leases includes items such as common area maintenance, utilities, taxes and other charges.

The weighted-average remaining lease term and weighted-average discount rate of the Company’s operating leases were as follows:

Weighted-average remaining lease term (years)
Weighted-average discount rate

As of December 31,

2021

2020

13.2 
5.6%  

13.7 
5.6%

The following table presents a reconciliation of the undiscounted future minimum lease payments remaining under the Company’s operating leases to

the amounts reported as operating lease liabilities on the consolidated balance sheet as of December 31, 2021 (in thousands):

Undiscounted future minimum lease payments:

2022
2023
2024
2025
2026
Thereafter

Total undiscounted future minimum lease payments

Amount representing imputed interest
Tenant improvement allowance not yet received

Total operating lease liabilities
Current portion of operating lease liabilities

Operating lease liabilities, non-current

As of
December 31, 2021

   $

   $

   $

6,556 
9,163 
10,224 
10,383 
10,388 
83,050 
129,764 

(41,619)
(1,464)
86,681 
(1,752)
84,929

The table above excludes future minimum lease payments for leases which were executed but had not yet commenced as of December 31, 2021, the

total of which were not material.

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7. Liability Related to Sale of Future Royalties

In December 2020, the Company entered into a royalty purchase agreement (the Royalty Purchase Agreement) with HCR. Under the agreement, HCR

purchased the Company’s rights to a capped amount of Zolgensma royalty payments under the Company’s license agreement with Novartis Gene
Therapies, including $4.0 million of royalty payments received by the Company in the fourth quarter of 2020 (the Pledged Royalties). In consideration for
these rights, HCR paid the Company $200.0 million (the Purchase Price), less $4.0 million representing the payment of the Pledged Royalties to HCR.
Beginning upon the effective date of the agreement, Zolgensma royalty payments, up to a specified threshold, will be paid to HCR, net of upstream
royalties payable by the Company to certain licensors in accordance with existing license agreements.

Pursuant to the Royalty Purchase Agreement, the total amount of royalty payments to be received by HCR under the agreement is subject to an
increasing cap (the Cap Amount) equal to (i) $260.0 million applicable for the period from the effective date of the agreement through November 7, 2024,
and (ii) $300.0 million applicable for the period from November 8, 2024 through the effective date of termination of the license agreement with Novartis
Gene Therapies. If, on or prior to the defined dates for each Cap Amount, the total amount of royalty payments received by HCR equals or exceeds the Cap
Amount applicable to such date, the Royalty Purchase Agreement will automatically terminate and all rights to the Zolgensma royalty payments will revert
back to the Company. The Company has no obligation to repay any amounts to HCR if total future Zolgensma royalty payments are not sufficient to
achieve the applicable Cap Amount prior to the termination of the license agreement with Novartis Gene Therapies.

The Company has a call option to repurchase its rights to the purchased royalties from HCR for a repurchase price equal to, as of the option exercise

date, $300.0 million minus the total amount of royalty payments received by HCR; provided, however, that with respect to a call option exercised on or
before November 7, 2024, in the event that the then applicable Cap Amount minus the total amount of royalty payments received by HCR is less than
$1.0 million, the repurchase price shall equal such difference.

The proceeds received from HCR of $196.0 million were recorded as a liability, net of transaction costs of $3.5 million, which is amortized over the

estimated life of the arrangement using the effective interest method. In order to determine the amortization of the liability, the Company is required to
estimate the total amount of future royalty payments to be received by HCR, subject to the Cap Amount, over the life of the arrangement. The total amount
of royalty payments received by HCR under the agreement, less the net proceeds received by the Company of $192.5 million, is recorded as interest
expense over the life of the arrangement using the effective interest method. Due to its continuing involvement in the underlying license agreement with
Novartis Gene Therapies, the Company continues to recognize royalty revenue on net sales of Zolgensma and records the royalty payments to HCR as a
reduction of the liability when paid. As such payments are made to HCR, the balance of the liability will be effectively repaid over the life of the Royalty
Purchase Agreement.

The Company estimates the effective interest rate used to record interest expense under the Royalty Purchase Agreement based on its estimate of
future royalty payments to be received by HCR. As of December 31, 2021, the estimated effective interest rate under the agreement was 15.1%. Over the
life of the arrangement, the actual effective interest rate will be affected by the amount and timing of the royalty payments received by HCR and changes in
the Company’s forecasted royalties. At each reporting date, the Company reassesses its estimate of total future royalty payments to be received by HCR at
the applicable Cap Amount, and prospectively adjusts the effective interest rate and amortization of the liability as necessary.

The following table presents the changes in the liability related to the sale of future royalties under the Royalty Purchase Agreement with HCR (in

thousands):

Proceeds from sale of future royalties in December 2020

Deferred transaction costs
Interest expense recognized
Balance at December 31, 2020

Zolgensma royalties paid to HCR
Interest expense recognized
Balance at December 31, 2021

Current portion of liability related to sale of future royalties

Liability related to sale of future royalties, non-current

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Liability Related to
Sale of Future Royalties

196,000 
(3,473)
771 
193,298 
(48,226)
26,277 
171,349 
(37,889)
133,460

   $

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8. Commitments and Contingencies

In-licensed Technology

The Company in-licenses intellectual property from third parties for technology and know-how used in its product candidates and development
programs, some of which is further sublicensed to NAV Technology Licensees and collaboration partners. In-licenses may require the Company to make
future payments relating to sublicense fees, milestone fees and royalties on future sales of licensed products. Additionally, the Company may be responsible
for the cost of the maintenance of the intellectual property as incurred by its licensors. Up-front fees to obtain licensed technology are recorded as research
and development expenses if the technology has no alternative future use. Sublicense fees are based on a specified percentage of license fees earned by the
Company as a result of sublicensing the technology to third parties and are recorded as cost of revenues. Milestone fees are recorded as cost of revenues if
the underlying milestone is achieved by a licensee, or as research and development expense if the underlying milestone is achieved by the Company as a
result of the development of its product candidates and the technology has no alternative future use. Royalties due to licensors on sales of licensed
products, including sales by NAV Technology Licensees, are recorded as cost of revenues. Patent maintenance costs are recorded as general and
administrative expenses.

Please refer to Note 10 for information on licenses granted by the Company and collaboration agreements with third parties.

The Trustees of the University of Pennsylvania

In February 2009, the Company entered into a license agreement, which has been amended from time to time, with The Trustees of the University of

Pennsylvania (together with the University of Pennsylvania, Penn) for exclusive, worldwide rights to certain patents owned by Penn underlying the
Company’s NAV Technology Platform, as well as exclusive rights to certain data, results and other information. Pursuant to the license agreement, the
Company is obligated to pay Penn royalties on net sales of licensed products and sublicense fees. Additionally, the Company is obligated to reimburse Penn
for certain costs incurred related to the maintenance of the licensed patents.

In April 2019, the Company amended its license from Penn to include exclusive license rights to certain patent rights and know-how, including
research data and other information, relating to the treatment of late-infantile neuronal ceroid lipofuscinosis type 2 (CLN2) disease. In consideration for the
additional licensed rights, and in addition to any consideration owed under the license prior to the amendment, the Company paid Penn an up-front fee and
is obligated to pay milestone fees of up to $20.5 million upon the achievement of various development and sales-based milestones and additional royalties
on net sales of licensed products for the treatment of CLN2 disease, none of which have been achieved or deemed probable of achievement as of December
31, 2021. Additionally, the amendment modified the percentage of sublicense fees the Company is obligated to pay Penn on amounts received by the
Company from third parties for the sublicensing of the licensed rights for the treatment of CLN2 disease.

Expenses incurred by the Company related to the license from Penn were recorded as follows (in thousands):

Cost of revenues
Research and development
General and administrative

2021

Years Ended December 31,
2020

2019

  $

  $

8,046    $
—     
706     
8,752    $

39    $
—     
821     
860    $

— 
200 
905 
1,105

As of December 31, 2021 and 2020, the Company had recorded $8.2 million and $0.1 million, respectively, in expenses payable to Penn under the

license agreement, which are included in accounts payable, accrued expenses and other current liabilities and other liabilities on the consolidated balance
sheets.

GlaxoSmithKline LLC

In March 2009, the Company entered into a license agreement, which was amended in April 2009, with GlaxoSmithKline LLC (GSK) for exclusive,

worldwide rights to certain patents underlying the Company’s NAV Technology Platform which are owned by Penn and exclusively licensed to GSK.
Pursuant to the license agreement, the Company is obligated to pay GSK royalties on net sales of licensed products and sublicense fees. Additionally, the
Company is obligated to reimburse GSK for certain costs incurred related to the maintenance of the licensed patents. The Company was also obligated to
pay $1.5 million to GSK upon the achievement of various milestones, all of which have been achieved and paid as of December 31, 2021.

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Expenses incurred by the Company related to the license from GSK were recorded as follows (in thousands):

Cost of revenues:

Royalties on net sales of Zolgensma
Other cost of revenues

Total cost of revenues

General and administrative

2021

Years Ended December 31,
2020

2019

  $

  $

43,161    $
626     
43,787     
889     
44,676    $

26,278    $
9,398     
35,676     
1,046     
36,722    $

5,822 
2,419 
8,241 
928 
9,169

As of December 31, 2021 and 2020, the Company had recorded $16.3 million and $13.1 million, respectively, in expenses payable to GSK under the
license agreement, which are included in accounts payable, accrued expenses and other current liabilities and other liabilities on the consolidated balance
sheets.

Clearside Biomedical, Inc.

In August 2019, the Company entered into an option and license agreement with Clearside Biomedical, Inc. (Clearside) pursuant to which the

Company was granted an option to exclusively license the worldwide rights to certain patents related to Clearside’s proprietary, in-office SCS
Microinjector™ for the delivery of RGX-314 to the suprachoroidal space to treat wet age-related macular degeneration (wet AMD), diabetic retinopathy
(DR) and other diseases. The Company exercised its license option in October 2019, resulting in a payment of $1.6 million to Clearside which was
recognized as research and development expense upon exercise. Additionally, the Company is obligated to pay milestone fees of up to $136.0 million upon
the achievement of various development and sales-based milestones, as well as royalties on net sales of licensed products using the SCS Microinjector.
Clearside is responsible for supplying the SCS Microinjector to the Company to support all preclinical, clinical and commercial needs. From the inception
of the agreement through December 31, 2021, the Company had incurred $3.0 million for development milestones achieved, or deemed probable of
achievement, under the agreement.

Other Licenses

In November 2014, the Company entered into a license agreement, which has been amended from time to time, with Regents of the University of
Minnesota (Minnesota), for an exclusive license under Minnesota’s interest in certain patent rights which are co-owned by Minnesota and the Company to
commercialize products covered by the licensed patent rights in any country or territory in which a licensed patent has been issued and is unexpired, or a
licensed patent application is pending. Pursuant to the license agreement, the Company is obligated to pay Minnesota annual maintenance fees, royalties on
net sales, sublicense fees and fees upon the achievement of various milestones. Additionally, the Company is obligated to pay for certain costs incurred
related to the maintenance of the licensed patents.

In August 2018, the Company entered into a license agreement with Emory University (Emory) for an exclusive license under Emory’s interest in
certain patent rights which are co-owned by Emory and the Company to commercialize products covered by the licensed patent rights in any country or
territory. Pursuant to the license agreement, the Company is obligated to reimburse Emory for patent prosecution and maintenance expenses and pay Emory
annual maintenance fees under certain circumstances, royalties on net sales, sublicense fees and fees upon the achievement of various milestones for the
first licensed product.

Other Funding Commitments

In the normal course of business, the Company enters into agreements with contract research organizations, contract manufacturing organizations and
other third parties for services to be provided to the Company. Generally, these agreements provide for termination upon notice, with specified amounts due
upon termination based on the timing of termination and the terms of the agreement. The actual amounts and timing of payments under these agreements
are uncertain and contingent upon the initiation and completion of services to be provided to the Company.

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Guarantees and Indemnifications

In the normal course of business, the Company enters into agreements that contain a variety of representations and provide for general

indemnification. The Company’s potential exposure under these agreements is unknown because it involves claims that may be made against the Company
in the future. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. As of
December 31, 2021 and 2020, the Company did not have any material indemnification claims that were probable or reasonably possible and consequently
had not recorded any related liabilities.

9. Capitalization

As of December 31, 2021 and 2020, the authorized capital stock of the Company included 100,000,000 shares of common stock, par value $0.0001
per share, and 10,000,000 shares of preferred stock, par value $0.0001 per share. The Company’s restated certificate of incorporation and bylaws contain
the rights, preferences and privileges of the Company’s stockholders and their respective shares.

In January 2021, the Company completed a public offering of 4,899,000 shares of its common stock (inclusive of 639,000 shares pursuant to the full

exercise by the underwriters of their option to purchase additional shares) at a price of $47.00 per share. The aggregate net proceeds received by the
Company from the offering, inclusive of the underwriters’ option exercise, were $216.1 million, net of underwriting discounts and commissions and
offering expenses payable by the Company.

Shares of common stock reserved for future issuance were as follows (in thousands):

Reserved for issuance under equity incentive plans
Reserved for issuance under employee stock purchase plan

As of December 31,

2021

2020

9,755   
769   
10,524   

8,659 
448 
9,107

10. License and Collaboration Agreements

Please refer to Note 8 for information on license agreements for technology in-licensed by the Company from third parties.

License and Royalty Revenue

As of December 31, 2021, the Company’s NAV Technology Platform was being applied by NAV Technology Licensees in one commercially

available product, Zolgensma, and in the development of a number of licensed products. Additionally, the Company has licensed intellectual property rights
to collaborators for the joint development of certain product candidates. Consideration to the Company under its license agreements may include: (i) up-
front and annual fees, (ii) milestone payments based on the achievement of certain development and sales-based milestones, (iii) sublicense fees, (iv)
royalties on sales of licensed products and (v) other consideration payable upon optional goods and services purchased by licensees. Sublicense fees vary
by license and range from a mid-single digit percentage to a low-double digit percentage of license fees received by licensees as a result of sublicenses.
Royalties on net sales of commercialized products vary by license and range from a mid-single digit percentage to a low double-digit percentage of net
sales by licensees.

License and royalty revenue consisted of the following (in thousands):

AbbVie collaboration and license agreement
Royalties on net sales of Zolgensma
Achievement of sales-based milestone for Zolgensma
Other license and royalty revenue

Total license and royalty revenue

2021

Years Ended December 31,
2020

2019

  $

  $

370,000    $
94,978   
—   
5,369   
470,347    $

—    $

61,631   
80,000   
12,936   
154,567    $

— 
20,829 
— 
14,404 
35,233

Development milestone payments are evaluated each reporting period and are only included in the transaction price of each license and recognized as
license revenue to the extent the milestones are considered probable of achievement. Sales-based milestones are excluded from the transaction price of each
license agreement and recognized as royalty revenue in the period of achievement. As

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of December 31, 2021, the Company’s license agreements, excluding additional licenses that could be granted upon the exercise of options by licensees,
contained unachieved milestones which could result in aggregate milestone payments to the Company of up to $1.58 billion, including (i) $538.3 million
upon the commencement of various stages of clinical trials, (ii) $21.0 million upon the submission of regulatory approval filings, (iii) $141.0 million upon
the approval of commercial products by regulatory agencies and (iv) $877.0 million upon the achievement of specified sales targets for licensed products,
including milestones payable upon first commercial sales of licensed products. To the extent the milestone payments are realized by the Company, the
Company will be obligated to pay sublicense fees to licensors based on a specified percentage of the fees earned by the Company. The achievement of
these milestones is highly dependent on the successful development and commercialization of licensed products and it is at least reasonably possible that
some or all of the milestone fees will not be realized by the Company.

Changes in Accounts Receivable, Contract Assets and Deferred Revenue

The following table presents changes in the balances of the Company’s net accounts receivable, contract assets and deferred revenue, as well as other

information regarding revenue recognized, during the periods presented (in thousands):

Accounts receivable, net, current and non-current:

Balance, beginning of period
Additions
Deductions
Balance, end of period

Contract assets:

Balance, beginning of period
Additions
Deductions
Balance, end of period

Deferred revenue, current and non-current:

Balance, beginning of period
Additions
Deductions
Balance, end of period

Revenue recognized during the period from:

Amounts included in deferred revenue at beginning of period
Performance obligations satisfied in previous periods

  $

  $

  $

  $

  $

  $

  $
  $

2021

Years Ended December 31,
2020

2019

46,266    $

472,347   
(483,912)  

34,701    $

42,303    $

158,682   
(154,719)  

46,266    $

350    $

1,074   
(350)  
1,074    $

4,232    $
—   
(899)  
3,333    $

—    $
350   
—   
350    $

3,333    $
1,124   
(225)  
4,232    $

390    $
98,575    $

—    $
146,772    $

31,599 
39,203 
(28,499)
42,303 

750 
1,000 
(1,750)
— 

3,933 
— 
(600)
3,333 

600 
26,689

Additions to accounts receivable during the periods presented consisted primarily of royalties on net sales of Zolgensma, new licenses granted by the

Company, the achievement of milestones by licensees, interest income recognized and decreases in the allowance for credit losses during the period.
Deductions to accounts receivable during the periods presented consisted primarily of amounts collected from licensees and increases in the allowance for
credit losses during the period. Additions to accounts receivable during the year ended December 31, 2021 include $370.0 million billed to AbbVie Global
Enterprises Ltd. under the collaboration and license agreement which became effective in November 2021. Additions to accounts receivable during the year
ended December 31, 2020 include $80.0 million billed to Novartis Gene Therapies upon the achievement of a sales-based milestone for net sales of
Zolgensma in the third quarter of 2020.

Additions to contract assets during the periods presented consisted of development milestones deemed probable of achievement by licensees during

the period and revenue recognized from research and development services performed by the Company for which payment by the licensee is not
unconditional. Deductions to contract assets during the periods presented consisted of the achievement of development milestones by licensees and billing
of the associated milestone payments by the Company. Contract assets as of December 31, 2021 and 2020 are included in other current assets on the
consolidated balance sheets.

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As of December 31, 2021, the Company had recorded deferred revenue of $3.3 million which represents consideration received from licensees for

performance obligations that have not yet been satisfied by the Company. Unsatisfied performance obligations consisted of (i) options granted to licensees
that provide material rights to the licensee to acquire additional licenses from the Company, which will be satisfied upon the exercise or expiration of the
options and (ii) research and development services to be performed by the Company related to licensed products, which will be satisfied as the research and
development services are performed.

Revenue recognized from performance obligations satisfied in previous periods was primarily attributable to Zolgensma royalty revenues, the

achievement of a sales-based milestone for net sales of Zolgensma, sublicense fees earned from licensees and changes in the transaction prices of the
Company’s license agreements. Changes in transaction prices were primarily attributable to development milestones achieved or deemed probable of
achievement during the periods, which were previously not considered probable of achievement.

Accounts Receivable, Contract Assets and the Allowance for Credit Losses

Accounts receivable, net consisted of the following (in thousands):

Current accounts receivable:
Billed to customers
Unbilled
Allowance for credit losses

Current accounts receivable, net

Non-current accounts receivable:

Unbilled
Allowance for credit losses

Non-current accounts receivable, net
Total accounts receivable, net

As of December 31,

2021

2020

365    $

32,074   
—   
32,439   

6,020   
(3,758)  
2,262   
34,701    $

30,573 
20,104 
(7,678)
42,999 

3,267 
— 
3,267 
46,266

  $

  $

The following table presents the changes in the allowance for credit losses related to accounts receivable and contract assets for the years ended

December 31, 2021 and 2020 (in thousands):

Balance at December 31, 2019

Provision for credit losses (recoveries)
Write-offs

Balance at December 31, 2020

Provision for credit losses (recoveries)
Changes in present value discount of receivables
Write-offs

Balance at December 31, 2021

Allowance for Credit Losses

Accounts Receivable

Contract Assets

  $

  $

—    $

7,678   
—   
7,678   
(2,569)  
(1,243)  
(108)  
3,758    $

— 
— 
— 
— 
— 
— 
— 
—

The Company’s allowance for credit losses as of December 31, 2021 and 2020 was related solely to accounts receivable from Abeona. Please refer to

the section below, Abeona Therapeutics Inc., for further information regarding amounts due from Abeona and the associated allowance for credit losses.
The Company’s provision for credit losses (recoveries) for the years ended December 31, 2021 and 2020 was $(2.6) million and $7.7 million, respectively,
and was related solely to changes in estimates regarding the collectability of the accounts receivable due from Abeona. No allowance for credit losses was
recorded as of December 31, 2019, and no provision for credit losses (recoveries) was recorded for the year ended December 31, 2019.

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Novartis Gene Therapies, Inc.

In March 2014, the Company entered into an exclusive license agreement (as amended, the March 2014 License) with Novartis Gene Therapies
(formerly AveXis, Inc.). Under the March 2014 License, the Company granted Novartis Gene Therapies an exclusive, worldwide commercial license, with
rights to sublicense, to the NAV Technology Platform, as well as other certain rights, for the treatment of SMA in humans by in vivo gene therapy.

In consideration for the rights granted under the license, Novartis Gene Therapies paid the Company (i) an up-front fee of $2.0 million upon the

execution of the agreement in 2014, (ii) license fees totaling $180.0 million upon the amendment of the agreement in January 2018 and the subsequent
acquisition of AveXis, Inc. (now Novartis Gene Therapies) by Novartis in May 2018, (iii) total cumulative payments of $12.3 million upon the
achievement of various development milestones, and (iv) a sales-based milestone payment of $80.0 million upon the achievement of $1.0 billion in
cumulative net sales of Zolgensma. In addition to the consideration above, Novartis Gene Therapies is obligated to pay to the Company fixed annual fees,
royalties on net sales of licensed products and a percentage of any sublicense fees received by Novartis Gene Therapies from sublicensees for the licensed
intellectual property rights. Royalties are payable by Novartis Gene Therapies at a mid-single to low double-digit percentage of net sales of licensed
products using the NAV AAV9 vector, and a low double-digit percentage of net sales of licensed products using a licensed vector other than NAV AAV9,
and are subject to reduction in specified circumstances.

Novartis Gene Therapies launched commercial sales of Zolgensma, a licensed product under the March 2014 License, in the second quarter of 2019,

upon which the Company began recognizing royalty revenue on net sales of the licensed product. Pursuant to the license agreement, Novartis Gene
Therapies was obligated to pay a sales-based milestone fee of $80.0 million to the Company upon the achievement of $1.0 billion in cumulative net sales of
licensed products. Novartis Gene Therapies achieved cumulative net sales of Zolgensma of $1.0 billion in the third quarter of 2020, upon which the
Company recognized revenue of $80.0 million related to the sales-based milestone fee. Additionally, the Company recognized license revenue of $3.5
million and $3.5 million for the years ended December 31, 2020 and 2019, respectively, related to development milestones achieved during the periods
which were previously considered not probable of achievement. As of December 31, 2020, all development and sales-based milestones under the March
2014 License had been achieved and associated milestone payments had been received from Novartis Gene Therapies.

The Company recognized the following amounts under the March 2014 License with Novartis Gene Therapies (in thousands):

Royalties on net sales of Zolgensma
Achievement of sales-based milestone for Zolgensma
Other license revenue

Total license and royalty revenue

Interest income from licensing

2021

Years Ended December 31,
2020

2019

94,978    $
—   
—   
94,978    $

61,631    $
80,000   
3,500   
145,131    $

20,829 
— 
3,500 
24,329 

22    $

26    $

29

  $

  $

  $

As of December 31, 2021 and 2020, the Company had recorded total accounts receivable of $26.6 million and $19.6 million, respectively, from

Novartis Gene Therapies under the March 2014 License, which consisted primarily of Zolgensma royalties receivable. Zolgensma royalties receivable
recorded as of December 31, 2021 included $12.8 million expected to be paid to HCR in accordance with the Royalty Purchase Agreement discussed in
Note 7.

Abeona Therapeutics Inc.

In November 2018, the Company entered into a license agreement with Abeona (as amended, the November 2018 License) for the treatment of
various diseases using the NAV Technology Platform. Pursuant to the November 2018 License, Abeona was required to pay a license fee of $8.0 million to
the Company no later than April 1, 2020. Abeona failed to make this payment, and in April 2020, the Company delivered to Abeona a notice of its breach
of the license agreement and written demand for payment. Upon expiration of the applicable cure period in May 2020, the license agreement terminated. As
a result of the termination, Abeona was required to pay an additional $20.0 million license fee to the Company within 15 days of the termination date,
which otherwise would have been due to the Company in November 2020. Unpaid balances due under the November 2018 License accrue interest at 1.5%
per month.

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In May 2020, after the termination of the November 2018 License, Abeona filed a claim in arbitration alleging that the Company had breached certain

responsibilities to communicate with Abeona regarding the Company’s prosecution of licensed patents under the November 2018 License. The Company
disputed Abeona’s claim and filed a counterclaim in arbitration demanding payment of the $28.0 million of unpaid fees from Abeona, plus accrued interest.
A binding arbitration was held in March 2021 and the arbitration tribunal issued its ruling in July 2021, which denied Abeona’s claim and upheld the
Company’s counterclaim. The arbitration tribunal’s ruling, which was subsequently amended to reflect a minor adjustment in the computation of accrued
interest, awarded the Company a total of $33.6 million, which consisted of $28.0 million in damages and $5.6 million in accrued interest payable to the
Company by Abeona.

Subsequent to the arbitration tribunal’s ruling in July 2021, Abeona filed an additional claim in a second arbitration to enforce a purported settlement

relating to the unpaid fees, which the Company disputed. In November 2021, the Company and Abeona entered into a settlement agreement and mutual
release (the Settlement Agreement) to resolve all arbitration and legal proceedings and mutually release each party from any and all claims under the
November 2018 License. Pursuant to the Settlement Agreement, Abeona will pay the Company a total of $30.0 million as follows: (i) $20.0 million which
was paid in November 2021, (ii) $5.0 million payable in November 2022, which is fully secured by an irrevocable standby letter of credit issued to the
Company by a reputable U.S. financial institution, and (iii) $5.0 million payable on the earlier of the third anniversary of the Settlement Agreement in
November 2024 or the closing of a specified type of transaction by Abeona.

As of December 31, 2020, the Company had recorded gross accounts receivable of $30.1 million from Abeona under the November 2018 License,
which consisted of the $8.0 million fee due in April 2020, the $20.0 million fee due within 15 days of the termination of the license agreement in May 2020
and accrued interest on the outstanding balances. As a result of its assessment of credit risk, the Company recorded an allowance for credit loss of $7.7
million as of December 31, 2020 related to the accounts receivable due from Abeona. As of December 31, 2020, the Company had recognized interest
income from licensing of $2.1 million related to the unpaid license fees from Abeona, which was included in the gross accounts receivable balance of $30.1
million. In accordance with its interest accrual policy, the Company ceased the recognition of interest income accrued under the license agreement
subsequent to the establishment of the allowance for credit losses in the third quarter of 2020.

In accordance with the Settlement Agreement, the Company received a payment of $20.0 million from Abeona in November 2021. As of December
31, 2021, the Company had recorded gross accounts receivable of $8.8 million from Abeona under the Settlement Agreement, which consisted of current
accounts receivable of $5.0 million for the payment due in November 2022, and non-current accounts receivable of $3.8 million for the present value of the
$5.0 million payment due by November 2024. While the Company anticipates taking appropriate measures to enforce the full collection of amounts due
from Abeona under the Settlement Agreement, the Company assessed the collectability of the accounts receivable from Abeona as it relates to credit risk.
In performing this assessment, the Company evaluated Abeona’s credit profile and financial condition, as well its expectations regarding Abeona’s future
cash flows and ability to satisfy the contractual obligations of the Settlement Agreement. As a result of its analysis, the Company recorded an allowance for
credit losses of $3.8 million as of December 31, 2021 related to the non-current accounts receivable due from Abeona. The Company recorded a provision
for credit losses (recoveries) of $(2.6) million and $7.7 million for the years ended December 31, 2021 and 2020, respectively, as a result of changes in
estimates regarding the allowance during the periods. The present value discount of the non-current accounts receivable from Abeona is accreted as interest
income from licensing through the contractual due date using the effective interest method. The Company has elected to record increases in the allowance
for credit losses associated with the accretion of the present value discount of the receivable as a reduction of the associated interest income, resulting in no
interest income recognized during the period related to the accretion of the present value discount on the non-current receivable from Abeona.

Collaboration Agreements

AbbVie Global Enterprises Ltd.

In September 2021, the Company entered into a collaboration and license agreement with AbbVie Global Enterprises Ltd. (AbbVie), a subsidiary of

AbbVie Inc., to jointly develop and commercialize RGX-314, the Company’s product candidate for the treatment of wet AMD, DR and other chronic
retinal diseases (the AbbVie Collaboration Agreement). The AbbVie Collaboration Agreement became effective in November 2021.

Pursuant to the AbbVie Collaboration Agreement, the Company granted AbbVie a co-exclusive license to develop and commercialize RGX-314 in the

United States and an exclusive license to develop and commercialize RGX-314 outside the United States. The Company and AbbVie will collaborate to
develop RGX-314 in the United States, and AbbVie will be responsible for the development of RGX-314 in specified markets outside the United States.
Through December 31, 2022, the Company will be responsible for development expenses for certain ongoing trials of RGX-314 and the parties will share
additional development expenses related to RGX-314. Beginning on January 1, 2023, AbbVie will be responsible for the majority of all RGX-314
development expenses.

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The Company will lead the manufacturing of RGX-314 for clinical development and U.S. commercial supply, and AbbVie will lead the

manufacturing of RGX-314 for commercial supply outside the United States. Manufacturing expenses will be allocated between the parties in accordance
with the terms of the AbbVie Collaboration Agreement and supply agreements determined in accordance with the agreement. If requested by AbbVie, the
Company will manufacture up to a specified portion RGX-314 for commercial supply outside the United States at a price specified in the agreement.
AbbVie will lead the commercialization of RGX-314 globally, and the Company will participate in U.S. commercialization efforts as provided under a
commercialization plan determined in accordance with the agreement. The Company and AbbVie will share equally in the net profits and net losses
associated with the commercialization of RGX-314 in the United States. Outside the United States, AbbVie will be responsible, at its sole cost, for the
commercialization of RGX-314.

In consideration for the rights granted under the AbbVie Collaboration Agreement, AbbVie paid the Company an up-front fee of $370.0 million upon

the effective date of the agreement in November 2021, and is required to pay to the Company up to $1.38 billion upon the achievement of specified
development and sales-based milestones, of which $562.5 million are based on development milestones and $820.0 million are sales-based milestones.
AbbVie is also required to pay to the Company tiered royalties on net sales of RGX-314 outside the United States at percentages in the mid-teens to low
twenties, subject to specified offsets and reductions.

The AbbVie Collaboration Agreement contains provisions for termination, including termination for convenience by AbbVie. Contemporaneously
with entering into the AbbVie Collaboration Agreement in September 2021, the Company entered into a sublicense agreement with AbbVie (the AbbVie
Sublicense Agreement) pursuant to which the Company granted AbbVie an exclusive sublicense to exploit licensed products in connection with the AbbVie
Collaboration Agreement under specified patents licensed to the Company by Penn. The AbbVie Sublicense Agreement became effective
contemporaneously with the AbbVie Collaboration Agreement in November 2021 and is coterminous with the AbbVie Collaboration Agreement.

The Company evaluated its various commitments under the AbbVie Collaboration Agreement and identified the following distinct units of account:

(i) delivery of an intellectual property license for the rights to develop and commercialize RGX-314 globally, (ii) development, manufacturing and
commercialization activities for RGX-314 in the United States, and (iii) manufacturing of commercial supply for sales of RGX-314 outside the United
States, if requested by AbbVie. In determining the distinct units of account, the Company concluded that the license granted to AbbVie to develop and
commercialize RGX-314 is distinct from the other goods and services promised under the agreement, as AbbVie can benefit from the license on a
standalone basis and, based on the stage of development of RGX-314, the underlying licensed products and know-how are not expected to be significantly
modified as a result of other goods and services promised under the agreement.

For each of the distinct units of account identified under the AbbVie Collaboration Agreement, the Company determined whether the transactions

should be accounted for as a contract with a customer within the scope of Topic 606 or as a collaborative arrangement within the scope of Topic 808. The
Company concluded that the units of account for the delivery of the functional intellectual property license and the manufacturing of commercial supply for
sales of RGX-314 outside the United States should be accounted for as revenue under Topic 606, as AbbVie is deemed to be a customer for these
transactions. The Company concluded that the unit of account for development, manufacturing and commercialization activities for RGX-314 in the United
States should be accounted for as a collaborative arrangement under Topic 808, as these represent joint operating activities for which the Company and
AbbVie are both active participants and exposed to significant risks and rewards dependent on the commercial success of such activities.

The Company applied the requirements of Topic 606 to the AbbVie Collaboration Agreement for the units of account in which AbbVie was deemed to

be a customer. The Company determined that there is only one material performance obligation under the agreement for the delivery of the intellectual
property license to develop and commercialize RGX-314 globally. The Company evaluated options granted to AbbVie under the agreement and determined
that the options do not represent material rights, and therefore are not considered separate performance obligations under the current contract. Specifically,
the Company concluded that the option granted to AbbVie to purchase commercial supply of RGX-314 from the Company for a portion of sales outside the
United States does not convey a material right, as the option is not priced at an incremental discount to the standalone selling price of the underlying goods
and services. Additionally, the Company identified various promises under the AbbVie Collaboration Agreement which were determined to be immaterial
in the context of the contract and will not be accounted for as a separate performance obligations.

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Upon the effective date of the agreement and as of December 31, 2021, the transaction price of the AbbVie Collaboration Agreement was $370.0
million, which consisted solely of the up-front payment in November 2021. The $370.0 million transaction price was fully recognized as revenue upon the
delivery of the license to AbbVie in November 2021. Variable consideration under the AbbVie Collaboration Agreement, which has been excluded from
the transaction price, includes $562.5 million in payments for development milestones that have not yet been achieved and were not considered probable of
achievement. Additionally, the transaction price excludes sales-based milestone payments of $820.0 million and royalties on net sales of RGX-314 outside
the United States. Development milestones will be added to the transaction price and recognized as revenue upon achievement, or if deemed probable of
achievement. In accordance with the sale- or usage-based royalty exception under Topic 606, royalties on net sales and sales-based milestones will be
recognized as revenue in the period the underlying sales occur or milestones are achieved.

The Company applied the requirements of Topic 808 to the AbbVie Collaboration Agreement for the units of account which were deemed to be a

collaborative arrangement. Both the Company and AbbVie will perform various activities related to the development, manufacturing and
commercialization of RGX-314 in the United States. Development costs are shared between the parties in accordance with the terms of the AbbVie
Collaboration Agreement, and the parties will share equally in the net profits and losses derived from sales of RGX-314 in the United States. The Company
accounts for payments to and from AbbVie for the sharing of development costs in accordance with its accounting policy for collaborative arrangements.
Amounts owed to AbbVie for the Company’s share of development costs incurred by AbbVie are recorded as research and development expense in the
period the costs are incurred. Amounts owed to the Company for AbbVie’s share of development costs incurred by the Company are recorded as a
reduction of research and development expense in the period the costs are incurred. At the end of each reporting period, the Company records a net amount
due to or from AbbVie as a result of the cost-sharing arrangement. As of December 31, 2021, the Company had recorded $5.9 million due from AbbVie for
reimbursement of development costs under AbbVie Collaboration Agreement which is included in other current assets on the consolidated balance sheet.

The Company recognized the following amounts under the AbbVie Collaboration Agreement (in thousands):

License and royalty revenue
Reduction of research and development expense for costs reimbursable by AbbVie

Year Ended
December 31, 2021

  $
  $

370,000 
5,866

Neurimmune AG

In July 2019, the Company entered into a collaboration and license agreement with Neurimmune AG (Neurimmune) pursuant to which the Company

and Neurimmune will jointly develop and commercialize novel gene therapies using AAV vectors from the NAV Technology Platform to deliver human
antibodies for chronic neurodegenerative diseases. The Company and Neurimmune will share all research and development costs for the first two years of
the agreement, after which each party will have the option, on a target-by-target basis, to: (i) continue as a 50% partner in the collaboration; (ii) receive a
phase-based worldwide royalty in lieu of continued development investment; or (iii) negotiate with the other party to lead the development and
commercialization of the respective program. Unless the parties agree otherwise, upon the commercialization of any product candidates, if any, it is
anticipated that profits and losses will be shared equally on a worldwide basis.

The Company determined that the collaboration and license agreement with Neurimmune is a collaborative arrangement within the scope of Topic

808, and that no unit of account under the arrangement should be accounted for as a transaction with a customer within the scope of Topic 606. The
Company accounts for payments to and from Neurimmune for the sharing of development costs in accordance with its accounting policy for collaborative
arrangements. Amounts owed to Neurimmune for the Company’s share of development costs incurred by Neurimmune are recorded as research and
development expense in the period the costs are incurred. Amounts owed to the Company for Neurimmune’s share of development costs incurred by the
Company are recorded as a reduction of research and development expense in the period the costs are incurred. At the end of each reporting period, the
Company records a net amount due to or from Neurimmune as a result of the cost-sharing arrangement. As of December 31, 2021 and 2020, the Company
had recorded $0.4 million and $0.3 million, respectively, due to Neurimmune for reimbursement of development costs under the collaboration and license
agreement which is included in accrued expenses and other current liability on the consolidated balance sheets.

During the years ended December 31, 2021, 2020 and 2019, the Company recorded $0.2 million, $0.3 million and less than $0.1 million, respectively,

in net cost reimbursement to Neurimmune for development activities under the collaboration and license agreement, which were recorded as research and
development expenses.

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11. Stock-based Compensation

In September 2014, the Board of Directors adopted the 2014 Stock Plan (the 2014 Plan). In June 2015, the Board of Directors adopted the 2015
Equity Incentive Plan (the 2015 Plan), which became effective upon the Company’s initial public offering in September 2015. The 2015 Plan replaced the
2014 Plan, and as of the effective date of the 2015 Plan, no further awards may be issued under the 2014 Plan. Any options or awards outstanding under the
2014 Plan as of the effective date of the 2015 Plan remained outstanding and effective. The number of authorized shares under the 2015 Plan automatically
increases annually on the first business day of each fiscal year, by the lesser of (i) 4% of the total number of shares of common stock outstanding on
December 31 of the prior year, or (ii) a number of common shares determined by the Board of Directors. As of December 31, 2021, the total number of
shares of common stock authorized for issuance under the 2015 Plan and 2014 Plan was 13,911,954, of which 2,352,346 remained available for future
grants under the 2015 Plan. In January 2022, the Board of Directors authorized an additional 1,713,246 shares to be issued under the 2015 Plan.

The 2014 Plan and 2015 Plan provide for the issuance of stock options, stock appreciation rights, restricted and unrestricted stock and unit awards,

and performance cash awards to employees, members of the Board of Directors and consultants of the Company. Since the inception of the plans, the
Company has issued only stock options and restricted stock units under the plans. Stock options under the 2014 Plan and 2015 Plan generally expire 10
years following the date of grant. Options typically vest over a four-year period, but vesting provisions can vary by award based on the discretion of the
Board of Directors. Certain stock option awards granted by the Company may include performance conditions that must be achieved in order for vesting to
occur. Stock options under the 2014 Plan and 2015 Plan have an exercise price at least equal to the estimated fair value of the Company’s common stock on
the date of grant. Restricted stock units typically vest over a four-year period, but vesting provisions can vary by award based on the discretion of the Board
of Directors. Upon vesting, restricted stock units are settled in common stock of the Company.

Shares of common stock underlying awards previously issued under the 2014 Plan and 2015 Plan which are reacquired by the Company, withheld by
the Company in payment of the purchase price, exercise price or withholding taxes, expired, cancelled due to forfeiture or otherwise terminated other than
by exercise or settlement, are added to the number of shares of common stock available for issuance under the 2015 Plan. Shares available for issuance
under the 2015 Plan may be either authorized but unissued shares of the Company’s common stock or common stock reacquired by the Company and held
in treasury. The 2015 Plan expires in June 2025, 10 years from the date it was adopted by the Board of Directors, unless earlier terminated.

Stock-based Compensation Expense

The Company’s stock-based compensation expense by award type was as follows (in thousands):

Stock options
Restricted stock units
Employee stock purchase plan

2021

Years Ended December 31,
2020

2019

  $

  $

35,320    $
2,835     
653     
38,808    $

31,178    $
—     
771     
31,949    $

25,964 
257 
633 
26,854

As of December 31, 2021, the Company had $67.9 million of unrecognized stock-based compensation expense related to stock options, restricted
stock units and the 2015 Employee Stock Purchase Plan (the 2015 ESPP), which is expected to be recognized over a weighted-average period of 2.3 years.

The Company recorded aggregate stock-based compensation expense in the consolidated statements of operations and comprehensive income (loss)

as follows (in thousands):

Research and development
General and administrative

2021

Years Ended December 31,
2020

2019

19,602    $
19,206     
38,808    $

16,280    $
15,669     
31,949    $

13,031 
13,823 
26,854

  $

  $

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Stock Options

The following table summarizes stock option activity under the 2014 Plan and 2015 Plan (in thousands, except per share data):

Outstanding at December 31, 2020

Granted
Exercised
Cancelled or forfeited

Outstanding at December 31, 2021

Exercisable at December 31, 2021

Vested and expected to vest at December 31, 2021

    Weighted-

average
Exercise
Price

Shares

    Weighted-

average
    Remaining    
    Contractual

Life
(Years)

Aggregate
Intrinsic
Value (a)

6,361    $
1,437    $
(404)   $
(268)   $
7,126    $

4,566    $

7,126    $

31.21     
43.04     
11.46     
45.98     
34.16     

29.62     

34.16     

7.2    $

101,356 

6.8    $

5.9    $

6.8    $

41,128 

40,607 

41,128

(a) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying options and the fair value of the common

stock for the options that were in the money at the dates reported.

The weighted-average grant date fair value per share of options granted during the years ended December 31, 2021, 2020 and 2019 was $26.01,

$23.82 and $31.19, respectively. During the years ended December 31, 2021, 2020 and 2019, the total number of stock options exercised was 404,263,
434,534 and 796,847, respectively, resulting in total proceeds of $4.3 million, $5.6 million and $7.1 million, respectively. The total intrinsic value of
options exercised during the years ended December 31, 2021, 2020 and 2019 was $11.9 million, $11.5 million and $30.8 million, respectively. 

The fair values of options granted were estimated at each grant date using the Black-Scholes valuation model with the following weighted-average

assumptions:

Expected volatility
Expected term (years)
Risk-free interest rate
Expected dividend yield

Restricted Stock Units

2021

Years Ended December 31,
2020

2019

68%   
6.0 
0.6%   
0.0%   

71%   
6.0 
1.4%   
0.0%   

74%
6.1 
2.3%
0.0%

The following table summarizes restricted stock unit activity under the 2015 Plan (in thousands, except per share data):

Unvested balance at December 31, 2020

Granted
Vested
Forfeited

Unvested balance at December 31, 2021

118

Weighted-
average
Grant Date
Fair Value

— 
43.67 
— 
44.55 
43.62

Shares

—    $
291    $
—    $
(14)   $
277    $

 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
   
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
   
   
   
 
 
 
   
   
   
 
   
   
      
  
   
      
  
   
      
  
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
  
  
   
   
 
 
 
 
 
 
   
 
 
 
 
 
   
 
 
 
 
 
   
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

No restricted stock units vested during the years ended December 31, 2021 and 2020. The total intrinsic value of restricted stock units vested during

the year ended December 31, 2019 was $1.8 million.

Employee Stock Purchase Plan

In June 2015, the Board of Directors adopted the 2015 ESPP, which became effective upon the Company’s initial public offering in September 2015.

The number of authorized shares reserved for issuance under the 2015 ESPP automatically increases on the first business day of each fiscal year by the
lesser of (i) 1% of the shares of common stock outstanding on the last business day of the prior fiscal year; or (ii) the number of shares determined by the
Board of Directors. Unless otherwise determined by the administrator of the 2015 ESPP, two offering periods of six months’ duration will begin each year
on January 1 and July 1. As of December 31, 2021, the total number of shares of common stock authorized for issuance under the 2015 ESPP was 998,683,
of which 769,174 remained available for future issuance. During the years ended December 31, 2021, 2020 and 2019, 53,596, 55,499 and 35,994 shares of
common stock, respectively, were issued under the 2015 ESPP. In January 2022, the Board of Directors authorized an additional 428,311 shares to be
issued under the 2015 ESPP.

12. Retirement Plan

The Company sponsors a defined-contribution retirement plan under Section 401(k) of the Internal Revenue Code (the 401(k) Plan). The 401(k) Plan

covers all employees who meet defined minimum age and service requirements, and allows participants to defer a portion of their annual compensation.
The Company matches employee deferrals up to a specified percentage of eligible compensation. For the years ended December 31, 2021, 2020 and 2019,
the Company incurred expenses of $2.6 million, $2.2 million and $1.8 million, respectively, for matching contributions to the 401(k) Plan.

13. Income Taxes

The components of income (loss) before income taxes were as follows (in thousands):

United States
Foreign

Total income (loss) before income taxes

2021

Years Ended December 31,
2020

2019

  $

  $

141,303    $
(56)    
141,247    $

(105,960)   $
(50)    
(106,010)   $

(97,435)
(53)
(97,488)

The components of the provision for income tax expense (benefit) were as follows (in thousands):

Current:

Federal
State
Foreign

Total current

Deferred:

Federal
State
Foreign

Total deferred
Total income tax expense (benefit)

2021

Years Ended December 31,
2020

2019

  $

  $

4,107    $
9,300     
—     
13,407     

—     
—     
—     
—     
13,407    $

—    $
5,240     
—     
5,240     

—     
—     
—     
—     
5,240    $

— 
(2,288)
— 
(2,288)

(284)
(183)
— 
(467)
(2,755)

In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (the CARES Act) was signed into law in March
2020. The CARES Act (i) lifted certain deduction limitations originally imposed by the TCJA, (ii) allowed corporate taxpayers to carryback net operating
losses (NOLs) originating during 2018 through 2020 for up to five years, which was not previously allowed under the TCJA, (iii) eliminated the 80% of
taxable income limitations on NOL utilization imposed by the TCJA, allowing corporate entities to fully utilize NOL carryforwards to offset taxable
income in 2018, 2019 or 2020, and (iv) enacted various other changes to corporate taxation. Also included in the CARES Act was a change to the TCJA
related to qualified

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Table of Contents

improvement property, retroactively allowing for a 15-year recovery period and bonus depreciation. As a result of this change, the Company recorded
current income tax benefit of $0.5 million for the year ended December 31, 2020 related to a reduction of state taxes associated with additional depreciation
deductions allowed for the 2018 tax year. Overall, the enactment of the CARES Act, including the change for qualified improvement property, did not
result in any material adjustments to the Company’s income tax provision for the year ended December 31, 2020.

Beginning in 2022, the TCJA eliminates the option to deduct research and development expenses currently and requires taxpayers to amortize such
costs over a period of five years. While the Federal government is currently considering legislation that would defer or repeal this provision, there is no
assurance such legislation will be enacted. The Company does not currently expect this provision of the TCJA will have a material impact on its tax
position or operating cash flows for the year ended December 31, 2022, however, the actual impact of this provision to future periods is uncertain as of this
time.

The following table presents a reconciliation of income tax expense (benefit) computed at the statutory federal income tax rate of 21% to income tax

expense (benefit) reported in the consolidated statements of operations and comprehensive income (loss) (in thousands):

2021

Years Ended December 31,
2020

2019

Federal income tax expense (benefit) at statutory rate
State income tax expense (benefit), net of federal tax effect
Research and development credits
Stock-based compensation
Executive compensation
Other non-deductible expenses and reconciling items
Change in corporate tax rates
Change in valuation allowance

Total income tax expense (benefit)

  $

  $

29,662    $
9,183   
(10,059)  
755   
1,511   
329   
14,772   
(32,746)  
13,407    $

(22,263)   $
(11,495)  
(7,793)  
587   
202   
684   
109   
45,209   
5,240    $

(20,473)
(15,323)
(11,075)
(2,134)
— 
144 
130 
45,976 
(2,755)

The significant components of the Company’s net deferred tax assets were as follows (in thousands):

Deferred tax assets:

Net operating loss carryforwards
Research and development tax credits
Stock-based compensation
Lease liabilities
Liability related sale of future royalties
Accruals and other

Total deferred tax assets before valuation allowance

Valuation allowance

Total deferred tax assets

Deferred tax liabilities:

Unrealized gains on marketable securities
Right-of-use assets
Depreciation and amortization
Other

Total deferred tax liabilities
Net deferred tax assets

As of December 31,

2021

2020

  $

3,981    $
45,576   
18,303   
23,430   
43,234   
6,230   
140,754   
(110,756)  
29,998   

—   
(16,363)  
(13,635)  
—   
(29,998)  

  $

—    $

14,683 
47,970 
15,644 
21,961 
62,089 
7,370 
169,717 
(142,907)
26,810 

(163)
(21,094)
(5,155)
(398)
(26,810)
—

The Company evaluated the positive and negative evidence bearing upon the realizability of its deferred tax assets as of December 31, 2021 and 2020.

Based on the Company’s history of operating losses, and other relevant facts and circumstances, the Company concluded that it was more likely than not
that the benefit of its deferred tax assets will not be realized. Accordingly, the Company provided a full valuation allowance for its net deferred tax assets as
of December 31, 2021 and 2020. The valuation allowance increased (decreased) by $(32.2) million and $45.4 million during the years ended December 31,
2021 and 2020, respectively. The decrease in the valuation allowance during the year ended December 31, 2021 was due primarily to the utilization of

120

 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

federal and state NOLs and research and development tax credit carryforwards, a decrease in the deferred tax asset for the liability related to the sale of
future royalties and other decreases in net deferred tax assets during the period. The increase in the valuation allowance during the year ended December
31, 2020 was due primarily to an increase in deferred tax assets resulting from the sale of the Company’s Zolgensma royalty rights to HCR in December
2020, which was treated as a sale for tax purposes, research and development credits generated during the period, stock-based compensation expense and
realized gains on sales of marketable securities, the impact of which was partially offset by the utilization of federal and state NOLs during the period.

As of December 31, 2021 and 2020, the Company had U.S. federal NOL carryforwards of zero and approximately $44.7 million, respectively, and
U.S. state NOL carryforwards of approximately $59.9 million and $79.7 million, respectively, which may be available to offset future income tax liabilities.
A portion of the Company’s U.S. state NOL carryforwards as of December 31, 2021 may be carried forward indefinitely, with the remaining portion
expiring at various dates between 2034 and 2041.

As of December 31, 2021 and 2020, the Company had U.S. federal and state research and development tax credit carryforwards of approximately
$45.6 million and $48.0 million, respectively, net of unrecognized tax benefits of $0.1 million and $0.1 million, respectively, which may be available to
reduce future income tax liabilities and expire at various dates between 2035 and 2041. The calculation of these credits requires assumptions to be made by
the Company to estimate qualified research expenses. The Company conducts formal studies to document the qualified activities and expenses used to
calculate these credits, however a portion of these credits may be subject to future studies which have not yet occurred, the results of which may result in an
adjustment to the Company’s credit carryforwards. The Company accounts for uncertain tax positions in accordance with the requirements of ASC 740,
and recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. As of December 31, 2021 and 2020, the
Company had total unrecognized tax benefits of $0.1 million and $0.1 million, respectively, which were reserved against its research and development tax
credit carryforwards as uncertain tax positions. No reserve for uncertain tax positions has been placed against qualified expenses for which a study has not
been conducted. However, a full valuation allowance has been provided against the net credit carryforwards and, if an adjustment is required upon the
completion of the study, this adjustment would be offset by an adjustment to the deferred tax asset established for the research and development credit
carryforwards and the valuation allowance. If these unrecognized tax benefits were to be recognized, the impact would be offset by an adjustment to the
valuation allowance, resulting in no impact on the Company’s effective tax rate. The Company does not expect that a significant portion of its unrecognized
tax benefits will increase or decrease in the next 12 months as of December 31, 2021.

Under the provisions of the Internal Revenue Code, the Company’s NOL and tax credit carryforwards are subject to review and possible adjustment
by the Internal Revenue Service and state tax authorities. NOL and tax credit carryforwards may be subject to an annual limitation in the event of certain
cumulative changes in the ownership interest of significant stockholders over a three-year period in excess of 50%, as defined under 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. The amount of the annual limitation is determined based on the value of the Company immediately prior to
the ownership change. Subsequent ownership changes may further affect the limitation in future years. The Company has completed several financings
since its inception which may have resulted in a change in control as defined by Sections 382 and 383 of the Internal Revenue Code, or could result in a
change in control in the future.

The Company and its subsidiaries file income tax returns in the United States, at the federal level and in various states, and in foreign jurisdictions.
The U.S. federal and state income tax returns are generally subject to tax examinations for the tax years ended December 31, 2017 onward. 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.

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14. Related Party Transactions

FOXKISER LLP

Since 2016, the Company has been party to professional services agreements with FOXKISER LLP (FOXKISER), an affiliate of certain stockholders

of the Company and an affiliate of a member of the Company’s Board of Directors, pursuant to which the Company pays a fixed monthly fee in
consideration for certain strategic services provided by FOXKISER. Effective January 2019, the Company entered into a new professional services
agreement with FOXKISER with similar terms and conditions as the previous agreements. The agreement was amended effective June 2019 to expand the
scope of the services provided and increase the monthly fee. Effective August 2020, the agreement was further amended to extend the term of the
agreement by two years through December 2022. The agreement may be terminated by either party with six months’ advanced written notice. In December
2021, the Company provided notice of termination of the agreement to FOXKISER, with such termination to be effective in June 2022. Expenses incurred
under the agreement with FOXKISER for the years ended December 31, 2021, 2020 and 2019 were $4.8 million, $4.8 million and $4.1 million,
respectively, and were recorded as research and development expenses in the consolidated statements of operations and comprehensive income (loss).

15. Net Income (Loss) Per Share

The computations of basic and diluted net income (loss) per share were as follows (in thousands, except per share data):

Basic net income (loss) per share:

Net income (loss)
Shares used in computation:

Weighted-average common shares outstanding

Basic net income (loss) per share

Diluted net income (loss) per share:

Net income (loss)
Shares used in computation:

Weighted-average common shares outstanding
Stock options
Restricted stock units
Employee stock purchase plan

Weighted-average diluted common shares

2021

Years Ended December 31,
2020

2019

127,840    $

(111,250)   $

(94,733)

42,438   

3.01    $

37,281   

(2.98)   $

36,690 
(2.58)

127,840    $

(111,250)   $

(94,733)

  $

  $

  $

42,438   
1,467   
2   
6   
43,913   

37,281   
—   
—   
—   
37,281   

36,690 
— 
— 
— 
36,690 
(2.58)

Diluted net income (loss) per share

  $

2.91    $

(2.98)   $

For periods in which the Company incurred net losses, common stock equivalents were excluded from the calculation of diluted net loss per share as

their effect would be anti-dilutive. Accordingly, basic and diluted net loss per share were the same for such periods. The following potentially dilutive
common stock equivalents outstanding at the end of the period were excluded from the computations of weighted-average diluted common shares for the
periods indicated as their effects would be anti-dilutive (in thousands):

Stock options issued and outstanding
Unvested restricted stock units outstanding
Employee stock purchase plan

2021

Years Ended December 31,
2020

2019

4,939     
248     
—     
5,187     

6,361     
—     
19     
6,380     

5,544 
— 
17 
5,561

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16. Supplemental Disclosures

Accrued expenses and other current liabilities consisted of the following (in thousands):

Accrued sublicense fees and royalties
Accrued personnel costs
Accrued external research and development expenses
Accrued income taxes payable
Accrued purchases of property and equipment
Accrued external general and administrative expenses
Other accrued expenses and current liabilities

As of December 31,

2021

2020

  $

  $

23,483    $
19,849   
11,783   
11,325   
5,285   
3,642   
744   
76,111    $

12,160 
13,155 
9,738 
3,135 
7,853 
2,865 
176 
49,082

123

 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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Exhibit
Number

Description

 Restated Certificate of Incorporation

 Amended and Restated Bylaws

 Specimen stock certificate evidencing the shares of common stock

 Description of Securities

 Form of Indemnity Agreement for directors and officers

 2014 Stock Plan, as amended

 2015 Equity Incentive Plan

EXHIBIT INDEX

Incorporated by Reference

Form

8-K  

8-K  

S-1

S-1

S-1

Exhibit
Number

3.1

3.2

4.1

10.1

10.2

  S-1/A  

10.3

  Filed or

Furnished
Herewith

X

Filing Date

6/7/21

9/22/15

8/17/15

8/17/15

8/17/15

9/15/15

3/1/21

3/1/21

9/8/15

 Form of Restricted Stock Unit Award Agreement for the 2015 Equity Incentive Plan

  10-K  

10.4

 Form of Stock Option Award Agreement for the 2015 Equity Incentive Plan

  10-K  

10.5

 2015 Employee Stock Purchase Plan

  S-1/A  

10.4

 Employment Agreement effective as of June 30, 2015 between the Registrant and
Kenneth T. Mills

S-1

10.5

8/17/15

 Employment Agreement effective as of June 30, 2015 between the Registrant and Vittal
Vasista

S-1

10.7

8/17/15

 Employment Agreement effective as of February 16, 2016 between the Registrant and
Curran Simpson

  10-K  

10.34

3/3/16

 Employment Agreement effective as of August 18, 2016 between the Registrant and
Patrick J. Christmas

  10-Q  

10.37

11/9/16

 Employment Agreement effective as of March 27, 2017 between the Registrant and
Olivier Danos, Ph.D.

  10-Q  

10.1

5/9/17

 Employment Agreement effective as of April 17, 2019 between the Registrant and Steve
Pakola, M.D.

  10-Q  

10.1

5/7/19

 Compensation Program for Non-Employee Directors

 Management Cash Incentive Plan

 License Agreement effective February 24, 2009 between the Registrant and The Trustees
of the University of Pennsylvania

  10-Q  

10.1

S-1

10.29

  S-1/A  

10.9

11/4/20

8/17/15

9/15/15

 First Amendment to License Agreement dated March 6, 2009 between the Registrant and
The Trustees of the University of Pennsylvania

S-1

10.10

8/17/15

 Second Amendment to License Agreement effective September 9, 2014 between the
Registrant and The Trustees of the University of Pennsylvania

  S-1/A  

10.11

9/15/15

 Third Amendment to License Agreement effective April 29, 2016 between the Registrant
and The Trustees of the University of Pennsylvania

  10-Q/A  

10.36

12/23/16

 Fourth Amendment to License Agreement effective April 4, 2019 between the Registrant
and The Trustees of the University of Pennsylvania

  10-Q  

10.2

5/7/19

 Fifth Amendment to License Agreement effective September 11, 2020 between the
Registrant and The Trustees of the University of Pennsylvania

  10-Q  

10.2

11/4/20

124

  3.1

  3.2

  4.1

  4.2

10.1

10.2*

10.3*

10.4*

10.5*

10.6*

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†

 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

Exhibit
Number

Description

Incorporated by Reference

Form

Exhibit
Number

Filing Date

  Filed or

Furnished
Herewith

10.21†

10.22

10.23†

10.24†

10.25†

10.26

10.27

10.28

10.29

10.30

10.31

10.32

10.33

10.34

10.35

10.36

10.37

10.38

10.39†

10.40†

21.1

23.1

 License Agreement dated March 6, 2009 between the Registrant and SmithKline
Beecham Corporation d/b/a GlaxoSmithKline

  S-1/A  

10.12

9/15/15

 Amendment to License Agreement dated April 15, 2009 between the Registrant and
SmithKline Beecham Corporation d/b/a GlaxoSmithKline

S-1

10.13

8/17/15

 License Agreement dated March 21, 2014 between the Registrant and AveXis, Inc.

  S-1/A  

10.16

 First Amendment to License Agreement dated January 8, 2018 between the Registrant
and AveXis, Inc.

  10-K  

10.24

9/15/15

3/6/18

 Collaboration and License Agreement dated September 10, 2021 between the Registrant
and AbbVie Global Enterprises Ltd.

  10-Q  

10.1

11/2/21

 Lease dated March 6, 2015 between the Registrant and BMR-Medical Center Drive LLC  

S-1

10.26

 First Amendment to Lease dated September 30, 2015 between the Registrant and BMR-
Medical Center Drive LLC

  10-K  

10.31

8/17/15

3/3/16

 Second Amendment to Lease dated November 23, 2015 between the Registrant and
BMR-Medical Center Drive LLC

  10-K  

10.32

3/3/16

 Third Amendment to Lease dated July 21, 2017 between the Registrant and BMR-
Medical Center Drive LLC

  10-Q  

10.1

8/8/17

 Fourth Amendment to Lease dated April 20, 2018 between the Registrant and BMR-
Medical Center Drive LLC

  10-Q  

10.1

5/8/18

 Fifth Amendment to Lease dated October 30, 2020 between the Registrant and ARE-
Maryland No. 45, LLC, as successor in interest to BMR-Medical Center Drive LLC

  10-Q  

10.3

11/4/20

 Lease dated May 16, 2016 between the Registrant and 400 Madison Holdings, LLC

8-K  

10.1

 First Amendment to Lease dated May 28, 2019 between the Registrant and
DS400OWNER, LLC, as successor-in-interest to 400 Madison Holdings, LLC

8-K  

10.2

 Lease dated November 1, 2018 between the Registrant and ARE-Maryland No. 24, LLC   10-Q  

10.1

 Letter Agreement to Lease dated April 12, 2019 between the Registrant and ARE-
Maryland No. 24, LLC

  10-Q  

10.3

6/3/19

6/3/19

11/7/18

5/7/19

 First Amendment to Lease dated April 23, 2019 between the Registrant and ARE-
Maryland No. 24, LLC

  10-Q  

10.4

5/7/19

 Second Amendment to Lease dated November 4, 2019 between the Registrant and ARE-
Maryland No. 24, LLC

  10-Q  

10.1

11/5/19

 Third Amendment to Lease dated October 30, 2020 between the Registrant and ARE-
Maryland No. 24, LLC

  10-Q  

10.4

11/4/20

 Royalty Purchase Agreement dated December 22, 2020 between the Registrant and
entities managed by Healthcare Royalty Management, LLC

  10-K  

10.42

3/1/21

 Settlement Agreement and Mutual Release dated November 12, 2021 between the
Registrant and Abeona Therapeutics Inc.

 Subsidiaries of the Registrant

 Consent of PricewaterhouseCoopers LLP, independent registered accounting firm

125

X

X

X

 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

Exhibit
Number

Description

Incorporated by Reference

Form

Exhibit
Number

Filing Date

  Filed or

Furnished
Herewith

31.1

31.2

32.1

101

 Certification of the Chief Executive Officer, as required by Section 302 of the Sarbanes-
Oxley Act of 2002

 Certification of the Chief Financial Officer as required by Section 302 of the Sarbanes-
Oxley Act of 2002

 Certifications of the Chief Executive Officer and Chief Financial Officer as required by
18 U.S.C. 1350

 The following materials from the Registrant’s Annual Report on Form 10-K for the fiscal
year ended December 31, 2021 formatted in Inline XBRL (eXtensible Business
Reporting Language):

(i)   Consolidated Balance Sheets
(ii)  Consolidated Statements of Operations and Comprehensive Income (Loss)
(iii) Consolidated Statements of Stockholders’ Equity
(iv) Consolidated Statements of Cash Flows
(v)  Notes to Consolidated Financial Statements

104

 The cover page from the Registrant’s Annual Report on Form 10-K for the fiscal year
ended December 31, 2021 formatted in Inline XBRL (included in Exhibit 101)

* Management contract or compensatory plan or arrangement.
†

Portions of this exhibit have been omitted.

X

X

X

X

The certifications attached as Exhibit 32.1 that accompany this Annual Report on Form 10-K are not deemed filed with the SEC and are not to be
incorporated by reference into any filing of REGENXBIO Inc. under the Securities Act or the Exchange Act, whether made before or after the date of this
Annual Report on Form 10-K, irrespective of any general incorporation language contained in such filing.

126

 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

Pursuant to the requirements of Section 13 and 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on

its behalf by the undersigned, thereunto duly authorized on March 1, 2022.

SIGNATURES

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.

REGENXBIO INC.

By:   /s/ Kenneth T. Mills

Kenneth T. Mills,
President and Chief Executive Officer

Signature 

/s/ Kenneth T. Mills
Kenneth T. Mills

/s/ Vittal Vasista
Vittal Vasista

/s/ Allan M. Fox
Allan M. Fox

/s/ Daniel J. Abdun-Nabi
Daniel J. Abdun-Nabi

/s/ Jean Bennett
Jean Bennett

/s/ Alexandra Glucksmann
Alexandra Glucksmann

/s/ A.N. “Jerry” Karabelas
A.N. “Jerry” Karabelas

/s/ George Migausky
George Migausky

/s/ David C. Stump
David C. Stump

/s/ Daniel Tassé
Daniel Tassé

Title 

 President, Chief Executive Officer and
 Director (Principal Executive Officer)

 Chief Financial Officer
 (Principal Financial and Accounting Officer)

Date 

March 1, 2022

March 1, 2022

 Chairman of the Board of Directors

March 1, 2022

 Director

 Director

 Director

 Director

 Director

 Director

 Director

127

March 1, 2022

March 1, 2022

March 1, 2022

March 1, 2022

March 1, 2022

March 1, 2022

March 1, 2022

 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
   
 
 
 
  
 
 
 
   
 
 
 
  
 
 
 
   
 
 
 
  
 
 
 
   
 
 
 
  
 
 
 
   
 
 
 
  
 
 
 
   
 
 
 
  
   
 
   
 
 
 
  
 
 
 
   
 
 
 
 
 
 
 
 
 
DESCRIPTION OF REGISTRANT’S SECURITIES
REGISTERED PURSUANT TO SECTION 12 OF THE
SECURITIES EXCHANGE ACT OF 1934

EXHIBIT 4.2

REGENXBIO Inc. has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended: our common

stock, par value $0.0001 per share. The following is a general summary of the terms of shares of our common stock. The description below does not
include all of the terms of the shares of common stock and should be read together with our restated certificate of incorporation and amended and restated
bylaws, each of which are incorporated by reference as an exhibit to the Annual Report on Form 10-K of which this Exhibit is a part. Unless the context
otherwise requires, throughout this document, the words “REGENXBIO,” “we,” or “us” refer to REGENXBIO Inc.

Authorized Capital Stock

Description of Common Stock

Our authorized capital stock consists of 110,000,000 shares, with a par value of $0.0001 per share, of which 100,000,000 shares are designated
as common stock and 10,000,000 shares are designated as preferred stock. The outstanding shares of our common stock are fully paid and non-assessable.

Dividend Rights

Subject to preferences that may apply to shares of preferred stock outstanding at the time, the holders of outstanding shares of our common

stock are entitled to receive dividends out of assets legally available at the times and in the amounts that our board of directors may determine from time to
time.

Preemptive and Conversion Rights

Holders of common stock have no preemptive or conversion rights or other subscription rights.

Redemption and Sinking Fund Rights

There are no redemption or sinking fund provisions applicable to our common stock.

Liquidation Rights

Upon our liquidation, dissolution or winding-up, the holders of common stock are entitled to share ratably in all assets remaining after payment

of all liabilities and the liquidation preferences of any outstanding preferred stock.

Voting Rights

Each holder of common stock is entitled to one vote per share on all matters submitted to a vote of stockholders. Notwithstanding the previous
sentence, unless otherwise provided by law holders of common stock are not entitled to vote on any amendment to our restated certificate of incorporation
that relates solely to the terms of any preferred stock if the holders of such preferred stock are entitled to vote on such amendment.

We have not provided for cumulative voting in the election of directors.

The General Corporation Law of the State of Delaware, or the Delaware General Corporation Law, provides that holders of a class of stock will

have the right to vote separately as a class on any proposal involving fundamental changes in the rights of the holders of that class of stock for proposals
that adversely affect such holders.

 
Anti-Takeover Effects of Delaware Law and Our Restated Certificate of Incorporation and Amended and Restated Bylaws

Delaware law, our restated certificate of incorporation and our amended and restated bylaws contain provisions that could make it more
difficult to effect an acquisition of us by means of a tender offer, proxy contest or otherwise, or to remove our incumbent officers and directors. It is
possible that these provisions could make it more difficult to accomplish, or could deter, transactions that stockholders otherwise consider to be in our or
their best interest, including transactions which provide for payment of a premium over the market price for our shares.

These provisions, summarized below, are intended to discourage coercive takeover practices and inadequate takeover bids. These provisions

are also designed to encourage persons seeking to acquire control of us to first negotiate with our board of directors. We believe that the benefits of the
increased protection of our potential ability to negotiate with the proponent of an unsolicited or unfriendly proposal to acquire or restructure us outweigh
the disadvantages of discouraging these proposals because negotiation of these proposals could result in an improvement of their terms.

Delaware Business Combination Statute

We are subject to Section 203 of the Delaware General Corporation Law. Section 203 prohibits a publicly held Delaware corporation from

engaging in a “business combination” with an “interested stockholder” for a period of three years following the time of the transaction in which the person
or entity became an interested stockholder, unless:

•

•

•

prior to that time, either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder is
approved by the board of directors of the corporation;

upon consummation of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder
owned at least 85% of the outstanding voting stock of the corporation, excluding for this purpose shares owned by persons who are
directors and also officers of the corporation and by specified employee benefit plans; or

at or after such time, the business combination is approved by the board of directors of the corporation and by the affirmative vote, and
not by written consent, of at least 66 2/3% of the outstanding voting stock that is not owned by the interested stockholder.

For the purposes of Section 203, a “business combination” is broadly defined to include:

•

•

•

•

•

any merger or consolidation involving the corporation and the interested stockholder;

any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the interested stockholder;

any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested stockholder,
subject to limited exceptions;

any transaction involving the corporation that has the effect of increasing the proportionate share of the stock of any class or series of the
corporation beneficially owned by the interested stockholder; or

the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits provided by
or through the corporation.

An “interested stockholder” is a person who, together with affiliates and associates, owns or within the immediately preceding three years did

own 15% or more of the corporation’s voting stock.

2

 
 
 
 
 
 
 
 
 
Undesignated Preferred Stock

The ability of our board of directors, without action by the stockholders, to issue up to 10,000,000 shares of undesignated preferred stock with
voting or other rights or preferences as designated by our board of directors could impede the success of any attempt to change control of us. The existence
of authorized but unissued shares of preferred stock may have the effect of deferring hostile takeovers or delaying changes in control or management of our
company.

Stockholder Action by Written Consent; Stockholder Meetings

Our restated certificate of incorporation and amended and restated bylaws eliminate the right of stockholders to act by written consent without a

meeting. As a result, a holder controlling a majority of our capital stock would not be able to amend our bylaws or remove directors without holding a
meeting of our stockholders called in accordance with our amended and restated bylaws. Our amended and restated bylaws provide that a special meeting
of stockholders may be called only by our chairman of the board or president, or by a resolution adopted by a majority of our board of directors. These
provisions might delay the ability of our stockholders to force consideration of a proposal or for stockholders controlling a majority of our capital stock to
take any action, including the removal of directors.

Requirements for Advance Notification of Stockholder Nominations and Proposals

Our amended and restated bylaws establish advance notice procedures with respect to stockholder proposals to be brought before a stockholder

meeting and the nomination of candidates for election as directors, other than nominations made by or at the direction of the board of directors or a
committee of the board of directors. These provisions could have the effect of delaying until the next stockholder meeting stockholder actions that are
favored by the holders of a majority of our outstanding voting securities.

Staggered Board

Our board of directors is divided into three classes. The directors in each class will serve for a three-year term, one class being elected each

year by our stockholders. This system of electing and removing directors may discourage a third party from making a tender offer or otherwise attempting
to obtain control of us, because it generally makes it more difficult for stockholders to replace a majority of the directors.

Removal of Directors

Our restated certificate of incorporation provides that no member of our board of directors may be removed from office by our stockholders

except for cause and, in addition to any other vote required by law, upon the approval of holders of at least two-thirds of the total voting power of all of our
outstanding voting stock then entitled to vote in the election of directors.

Board of Directors Vacancies

Our restated certificate of incorporation and amended and restated bylaws authorize our board of directors to fill vacant directorships. In

addition, the number of directors constituting our board of directors is set only by resolution adopted by a majority vote of our entire board of directors.
These provisions will prevent a stockholder from increasing the size of our board of directors and gaining control of our board of directors by filling the
resulting vacancies with its own nominees.

Stockholders Not Entitled to Cumulative Voting

Our restated certificate of incorporation does not permit stockholders to cumulate their votes in the election of directors. Accordingly, the

holders of a majority of the outstanding shares of our common stock entitled to vote in any election of directors can elect all of the directors standing for
election, if they choose, other than any directors that holders of our preferred stock may be entitled to elect.

3

 
Amendment of Charter Provisions

The amendment of any of the above provisions, except for the provision making it possible for our board of directors to issue preferred stock,

would require approval by holders of at least two-thirds of the total voting power of all of our outstanding voting stock.

The provisions of Delaware law, our restated certificate of incorporation and our amended and restated bylaws could have the effect of

discouraging others from attempting hostile takeovers and, as a consequence, they may also inhibit temporary fluctuations in the market price of our
common stock that often result from actual or rumored hostile takeover attempts. These provisions may also have the effect of preventing changes in the
composition of our board and management. It is possible that these provisions could make it more difficult to accomplish transactions that stockholders
may otherwise deem to be in their best interests.

Choice of Forum

Our restated certificate of incorporation provides that the Court of Chancery of the State of Delaware (or, if the Court of Chancery does not

have jurisdiction, the federal district court for the District of Delaware) will be the exclusive forum for any derivative action or proceeding brought on our
behalf; any action asserting a breach of fiduciary duty; any action asserting a claim against us arising pursuant to the Delaware General Corporation Law,
our restated certificate of incorporation or amended and restated bylaws; or any action asserting a claim against us that is governed by the internal affairs
doctrine. Additionally, if the subject matter of any action within the scope of the preceding sentence is filed in a court other than a court located with the
State of Delaware, or is a “foreign action” (as defined in our restated certificate of incorporation), in the name of any stockholder, such stockholder shall be
deemed to have consented to (i) the personal jurisdiction of the state and federal courts located within the State of Delaware in connection with any action
brought in any such court to enforce the preceding sentence and (ii) having service of process made upon such stockholder in any such action by service
upon such stockholder’s counsel in the foreign action as agent for such stockholder.

Additionally, our restated certificate of incorporation provides that, unless we consent in writing to the selection of an alternative forum, the

federal district courts of the United States of America shall, to the fullest extent permitted by law, be the exclusive forum for the resolution of any
complaint asserting a cause of action arising under the Securities Act of 1933, as amended. Any person or entity purchasing or otherwise acquiring any
interest in any of our securities shall be deemed to have notice of and consented to this provision.

The enforceability of similar choice of forum provisions in other companies’ certificates of incorporation has been challenged in legal

proceedings, and it is possible that a court could find these types of provisions to be inapplicable or unenforceable.

Indemnification

Our restated certificate of incorporation includes provisions that limit the liability of our directors for monetary damages for breach of their

fiduciary duty as directors, except for liability that cannot be eliminated under the Delaware General Corporation Law. Accordingly, our directors will not
be personally liable for monetary damages for breach of their fiduciary duty as directors, except for liabilities:

•

•

•

•

for any breach of the director’s duty of loyalty to us or our stockholders;

for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law;

for unlawful payments of dividends or unlawful stock repurchases or redemptions, as provided under Section 174 of the Delaware
General Corporation Law; or

for any transaction from which the director derived an improper personal benefit.

4

 
 
 
 
 
Any amendment or repeal of these provisions will require the approval of the holders of shares representing at least two-thirds of the shares

entitled to vote in the election of directors, voting as one class.

Our restated certificate of incorporation and amended and restated bylaws also provide that we will indemnify our directors and officers to the

fullest extent permitted by Delaware law. Our restated certificate of incorporation and amended and restated bylaws also permit us to purchase insurance on
behalf of any officer, director, employee or other agent for any liability arising out of his or her actions as our officer, director, employee or agent,
regardless of whether Delaware law would permit indemnification. We have entered into separate indemnification agreements with our directors and
officers that require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors and
to advance their expenses incurred as a result of any proceeding against them as to which they could be indemnified. We believe that the limitation of
liability provision in our restated certificate of incorporation and the indemnification agreements facilitate our ability to continue to attract and retain
qualified individuals to serve as directors and officers. The limitation of liability and indemnification provisions in our restated certificate of incorporation
and amended and restated bylaws may discourage stockholders from bringing a lawsuit against directors for breach of their fiduciary duties. They may also
reduce the likelihood of derivative litigation against directors and officers, even though an action, if successful, might benefit us and our stockholders. A
stockholder’s investment may be harmed to the extent we pay the costs of settlement and damage awards against directors and officers pursuant to these
indemnification provisions.

Stock Exchange Listing

Our common stock is listed on The Nasdaq Global Select Market under the symbol “RGNX.”

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Computershare Trust Company, N.A.

5

 
 
Certain identified information has been excluded from this exhibit pursuant to Item 601(b)(10)(iv) of Regulation S-K because such information
both (i) is not material and (ii) would likely cause competitive harm if publicly disclosed. Excluded information is indicated with brackets and
asterisks.

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

This  Settlement  Agreement  and  Mutual  Release  (“Settlement  Agreement”)  is  entered  into  by  and  between
REGENXBIO  Inc.  (“REGENXBIO”)  and  Abeona  Therapeutics  Inc.  (“Abeona”)  and  is  effective  as  of  the  date  of  the  last
signature  hereto  (the  “Effective  Date”).    REGENXBIO  and  Abeona  are  collectively  referred  to  as  the  “Parties”  in  this
Settlement Agreement, and each a “Party”.

EXHIBIT 10.40

RECITALS

WHEREAS, REGENXBIO and Abeona were parties to a License Agreement dated November 4, 2018, as amended on
November  4,  2019  (the  “License  Agreement”),  whereby  REGENXBIO  licensed  certain  adeno-associated  virus  serotype  9
(“AAV9”) technology to Abeona for the exclusive use in four specific fields:   (a) treatment of Neuronal Ceroid Lipofuscinosis-1
(“CLN1”);  (b)  treatment  of  Neuronal  Ceroid  Lipofuscinosis-3  (“CLN3”);  (c)  treatment  of  Mucopolysaccharidosis  type  IIIA
(“MPS IIIA”); and (d) treatment of Mucopolysaccharidosis type IIIB (“MPS IIIB”);

WHEREAS, the License Agreement terminated on May 2, 2020;

WHEREAS,  on  May  25,  2020,  Abeona  filed  a  Demand  for  Arbitration  with  the  American  Arbitration  Association
(“AAA”),  styled  Abeona  Therapeutics  Inc.  v.  REGENXBIO  Inc.,  Case  No.  01-20-0005-3750  (the  “First  Arbitration”)  and
asserted a breach of contract claim against REGENXBIO;

WHEREAS,  on  June  10,  2020,  REGENXBIO  filed  an  Answer  to  Abeona’s  Demand  for  Arbitration  in  the  First

Arbitration and asserted a counterclaim for breach of contract against Abeona;

WHEREAS, the First Arbitration proceeded through discovery, an evidentiary hearing, and post-hearing briefing;  

WHEREAS, on July 13, 2021, the tribunal in the First Arbitration issued a final arbitration award that denied Abeona’s
claim  against  REGENXBIO,  upheld  REGENXBIO’s  counterclaim  against  Abeona,  and  awarded  REGENXBIO  an  amount  of
$34,125,094.73;  

WHEREAS,  on  July  16,  2021,  REGENXBIO  initiated  a  special  proceeding  in  New  York  state  court  to  confirm  the
final arbitration award from the First Arbitration, as amended on July 23, 2021 and supplemented on August 13, 2021, styled In
the  Matter  of  the  Application  of  REGENXBIO  Inc.  v.  Abeona  Therapeutics  Inc.,  Index  No.  654413/2021  (“the  Enforcement
Petition”);

WHEREAS, on August 5, 2021, the tribunal in the First Arbitration issued the corrected final arbitration award, which

adjusted the amount that Abeona owed REGENXBIO to $33,648,000.00;

 
WHEREAS, on August 9, 2021, Abeona filed a Demand for Arbitration with the AAA, styled Abeona Therapeutics
Inc. v. REGENXBIO Inc., AAA No. 01-21-0016-0896 (the “Second Arbitration”), and together with the First Arbitration (“the
Arbitrations”);

WHEREAS,  on  September  14,  2021,  REGENXBIO  filed  an  Answering  Statement,  Counterclaim,  and  Request  for

Permission to File a Dispositive Motion in the Second Arbitration;

WHEREAS,  on  September  28,  2021  Abeona  filed  an  Answering  Statement  to  REGENXBIO’s  Counterclaim  in  the

Second Arbitration;

WHEREAS,  the  Parties  have  agreed  to  resolve  the  current  disputes  between  them,  namely  the  Arbitrations  and  the

Enforcement Petition, and set forth below the terms and conditions of their resolution; and

WHEREAS, the Parties have agreed that this Settlement Agreement will not include a license of any kind from

REGENXBIO to Abeona, and any future license between the Parties would have to be negotiated separately and require
additional consideration than the consideration set forth in this Settlement Agreement.

NOW, THEREFORE, in consideration of the mutual promises contained in this Settlement Agreement, and for good

and valuable consideration, the receipt and sufficiency of which the Parties acknowledge, the Parties agree as follows:

1.

Settlement Payment:  As consideration for REGENXBIO’s execution of and compliance with this Settlement
Agreement, including without limitation its Release of claims as set forth in Section 5(b) below, Abeona will pay REGENXBIO a
total of $30,000,000.00 (in United States Dollars) (the “Settlement Payment”), which shall be payable as follows:

AGREEMENT

(a) $20,000,000.00 within [****] of the Effective Date (the “First Installment of the Settlement Payment”);

(b)  $5,000,000.00  on  the  first  anniversary  of  the  Effective  Date  (the  “Second  Installment  of  the  Settlement
Payment”); and

(c)  $5,000,000.00  on  the  earlier  of:    (i)  the  third  anniversary  of  the  Effective  Date;  or  (ii)  the  closing  of  a  Strategic
Transaction (the “Third  Installment  of  the  Settlement  Payment”).    The  term  “Strategic  Transaction”  shall  mean
any  transaction  to  which  Abeona  or  any  affiliate  is  a  Party  and  through  which  Abeona  receives  or  becomes  due  to
receive  at  least  [****]  from  a  counterparty  or  counterparties,  including,  [****].    For  the  avoidance  of  doubt,  and
without  limitation,  a  Strategic  Transaction  shall  not  include  any  financing  transaction  or  any  transaction  under
Abeona’s 2015 Equity Incentive Plan or at-the-market offering of Abeona’s stock.  

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

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As security for its obligation to pay the Second Installment of the Settlement Payment, Abeona will provide REGENXBIO with
an  irrevocable  standby  letter  of  credit  in  the  amount  of  $5,000,000.00  guaranteed  by  a  reputable  financial  institution  formed
under the federal laws of the United States and which is reasonably acceptable to REGENXBIO within [****] of the Effective
Date.  The First Installment of the Settlement Payment, Second Installment of the Settlement Payment, and Third Installment of
the Settlement Payment will be made via wire transfer.  [****].

2.

Notice of Strategic Transaction:   Abeona  agrees  to  notify  REGENXBIO’s  Chief  Legal  Officer  in  writing  at
least [****] before the anticipated closing of any Strategic Transaction that is scheduled to occur before the third anniversary of
the Effective Date.  REGENXBIO must maintain any such information in confidence, and must not use any such information for
the  purpose  of  engaging  in  any  securities  transaction,  unless  and  until  such  information  is  announced  publicly  by  Abeona  or
another party.  REGENXBIO further agrees that it will not use any such information in a manner that competes with Abeona or
that interferes with an anticipated Strategic Transaction.    

3.

Joint Stipulations of Discontinuance and Dismissal:  The Parties agree to execute and file a joint stipulation of
discontinuance  dismissing  the  Enforcement  Petition  and  a  joint  stipulation  dismissing  the  Second  Arbitration  within  [****]  of
REGENXBIO’s  receipt  of  and  final  clearance  of  the  First  Installment  of  the  Settlement  Payment  described  in  Section  1
above.   The  Parties  further  agree  to  send  a  joint  email  to  the  AAA  and  the  three  arbitrators  for  the  Second  Arbitration  within
[****] of the Effective Date, informing them that the Parties have resolved their dispute.  

4.

No Admission of Fault or Liability:  REGENXBIO and Abeona agree that their mutual willingness to enter
into this Settlement Agreement does not constitute, and shall not be construed as, any admission or acknowledgement of any fault
or  wrongdoing  by  either  Party.    REGENXBIO  and  Abeona  agree  that  they  will  not  represent  to  anyone  that  the  other  Party’s
willingness to enter into this Settlement Agreement constitutes or represents an admission or acknowledgement of fault, breach,
or any unlawful conduct or activity.  

5.

Mutual Releases.

(a)

Release  by  Abeona:    Abeona,  on  behalf  of  itself  and  all  of  its  affiliates,  officers,  directors,
employees,  shareholders,  legal  representatives,  successors  and  assigns  (collectively,  the  “Abeona Releasing Parties”),  forever
releases and discharges REGENXBIO, its officers, directors, shareholders, affiliates, employees, contractors, agents, successors,
and  assigns  and  other  legal  representatives  (collectively,  the  “REGENXBIO  Released  Parties”),  from  any  and  all  claims,
demands, actions, judgments and executions arising out of or relating to the License Agreement that it ever had, now has, or may
have  in  the  future,  known  or  unknown,  or  that  anyone  claiming  through  them  may  have  or  claim  to  have  against  the
REGENXBIO Released Parties, including but not limited to, all of the claims asserted by Abeona in the Arbitrations; provided,
however, that the foregoing release does not preclude Abeona from asserting any available counterclaim or defense in any future
action brought by any REGENXBIO Released Party arising out of or relating to alleged improper use, misuse, misappropriation,
or infringement of any formerly Licensed Technology as defined in Section 1.20 of the License Agreement or any

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

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other intellectual property rights of REGENXBIO. For the avoidance of doubt, the foregoing release does not apply to any claim,
demand,  action,  judgment,  or  execution  that  Abeona  may  have,  initiate,  or  obtain  against  REGENXBIO  for  a  breach  of  any
obligation under this Settlement Agreement.

(b)

Release  by  REGENXBIO:  Upon  both  REGENXBIO’s  receipt  and  final  clearance  of  the  First
Installment of the Settlement Payment and REGENXBIO’s receipt of the letter of credit securing the Second Installment of the
Settlement  Payment  set  forth  in  Section  1  above,  REGENXBIO,  on  behalf  of  itself  and  all  of  its  affiliates,  officers,  directors,
employees,  shareholders,  legal  representatives,  successors  and  assigns  (collectively,  the  “REGENXBIO  Releasing  Parties”),
forever releases and discharges Abeona, its officers, directors, shareholders, affiliates, employees, contractors, agents, successors,
and  assigns  and  other  legal  representatives  (collectively,  the  “Abeona Released Parties”),  from  any  and  all  claims,  demands,
actions, judgments and executions arising out of or relating to the License Agreement, that it ever had, now has, or may have in
the future, known or unknown, or that anyone claiming through them may have or claim to have against the Abeona Released
Parties,  including  but  not  limited  to,  all  of  the  claims  asserted  by  REGENXBIO  in  the  Arbitrations  and  in  the  Enforcement
Petition; provided, however, that the foregoing release does not extend to any past, present, or future claims, demands, actions,
judgments and executions arising out of or relating to improper use, misuse, misappropriation, or infringement of any formerly
Licensed  Technology  as  defined  in  Section  1.20  of  the  License  Agreement  or  any  other  intellectual  property  rights  of
REGENXBIO, nor does it extend to any claim, demand, action, judgment, or execution that REGENXBIO may have, initiate, or
obtain against Abeona for a breach of any obligation under this Settlement Agreement.  For the avoidance of doubt, the foregoing
release  does  not  grant  Abeona  a  license  of  any  kind  to  the  Licensed  Technology  or  any  other  intellectual  property  rights  of
REGENXBIO, nor does it reinstate the License Agreement.

(c)

Additional Agreements:  The Parties agree and confirm that the Settlement Payment is intended to
be a contemporaneous exchange for new value given to Abeona in the form of the consideration provided under this Settlement
Agreement, including, among other things, the Release by REGENXBIO against Abeona set forth in Section 5(b), which is an
essential  part  of  this  Settlement  Agreement.    Abeona  covenants  and  agrees  that  neither  it  nor  any  of  its  affiliates  shall  file  a
voluntary petition for relief under the United States Bankruptcy Code (the “Bankruptcy Code”) or make an assignment for the
benefit  of  creditors  within  [****]  of  REGENXBIO’s  receipt  and  final  clearance  of  the  First  Installment  of  the  Settlement
Payment, the Second Installment of the Settlement Payment, or the Third Installment of the Settlement Payment.  Abeona further
covenants and agrees that it will (and it will cause its affiliates to) timely oppose the entry of an order for relief with respect to
any involuntary petition under the Bankruptcy Code that may be filed with respect to Abeona or any of its affiliates.  In the event
that any portion of the Settlement Payment is avoided for any reason or REGENXBIO is required to turnover any portion of the
Settlement  Payment  for  any  reason,  the  release  in  Section  5(b)  of  this  Settlement  Agreement  shall  be  void  ab  initio,  and
REGENXBIO shall be entitled to assert its claims against Abeona or its estate, solely to the extent that such claim exceeds the
portion of the Settlement Payment that was not avoided or turned over.

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

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6.

Dispute  Resolution:    In  the  event  of  any  controversy  or  claim  arising  out  of  or  relating  to  this  Settlement
Agreement, the Parties shall first attempt to resolve such controversy or claim through good faith negotiations for a period of not
less than [****] following notification of such controversy or claim to the other Party.  If such controversy or claim cannot be
resolved  by  means  of  such  negotiations  during  such  period,  then  such  controversy  or  claim  shall  be  resolved  by  binding
arbitration administered by the American Arbitration Association (“AAA”) in accordance with the Commercial Arbitration Rules
of the AAA in effect on the date of commencement of the arbitration, subject to the provisions of this Section 6.  The arbitration
shall be conducted as follows:

in New York, New York.

(a)

The arbitration shall be conducted by three arbitrators and shall be conducted in English and held

(b)

In  its  demand  for  arbitration,  the  Party  initiating  the  arbitration  shall  provide  a  statement  setting
forth  the  nature  of  the  dispute,  the  names  and  addresses  of  all  other  parties,  an  estimate  of  the  amount  involved  (if  any),  the
remedy sought, otherwise specifying the issue to be resolved, and appointing one neutral arbitrator.  In an answering statement to
be filed by the responding Party within [****] after confirmation of the notice of filing of the demand is sent by the AAA, the
responding Party shall appoint one neutral arbitrator.  Within [****] from the date on which the responding Party appoints its
neutral arbitrator, the first two arbitrators shall appoint a chairperson.

If a Party fails to make the appointment of an arbitrator as provided in Section 6(b), the AAA shall
make  the  appointment.    If  the  appointed  arbitrators  fail  to  appoint  a  chairperson  within  the  time  specified  in  Section  6(b)  and
there is no agreed extension of time, the AAA shall appoint the chairperson.

(c)

(d)

The  arbitrators  will  render  their  award  in  writing  and,  unless  all  Parties  agree  otherwise,  will
include an explanation in reasonable detail of the reasons for their award.  Judgment upon the award rendered by the arbitrators
may be entered in any court having jurisdiction thereof.  The arbitrators will have the authority to grant injunctive relief and other
specific performance; provided that the arbitrators will have no authority to award damages in contravention of this Settlement
Agreement, and each Party irrevocably waives any claim to such damages in contravention of this Settlement Agreement.  The
arbitrators will, in rendering their decision, apply the substantive law of the State of New York, without giving effect to conflict
of law provisions that may require the application of the laws of another jurisdiction.  The decision and award rendered by the
arbitrators will be final and non-appealable (except for an alleged act of corruption or fraud on the part of the arbitrator).

Settlement Agreement as expeditiously, efficiently, and cost-effectively as possible.

(e)

The Parties shall use their reasonable efforts to conduct all dispute resolution procedures under this

All expenses and fees of the arbitrators and expenses for hearing facilities and other expenses of the
arbitration will be borne equally by the Parties unless the Parties agree otherwise or unless the arbitrators in the award assess such
expenses against one of the Parties or

(f)

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

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allocate such expenses other than equally between the Parties.  Each of the Parties will bear its own counsel fees and the expenses
of its witnesses except to the extent otherwise provided in this Settlement Agreement or by applicable law.

(g)

Compliance with this Section 6 is a condition precedent to seeking relief in any court or tribunal in
respect of a dispute, but nothing in this Section 6 will prevent a Party from seeking equitable or other interlocutory relief in the
courts of appropriate jurisdiction, pending the arbitrators’ determination of the merits of the controversy, if applicable to protect
the confidential information, property, or other rights of that Party or to otherwise prevent irreparable harm that may be caused by
the other Party’s actual or threatened breach of this Settlement Agreement.

7.

Applicable Law:  This Settlement Agreement shall be construed and governed in accordance with the law of
the State of New York, without giving effect to conflict of law provisions that may require the application of the laws of another
jurisdiction.  

8.

Integration, Modification, and Waiver.

(a)

This  Settlement  Agreement  constitutes  the  entire  agreement  between  REGENXBIO  and  Abeona
concerning the full and final resolution of any current, potential, or future claims between or against REGENXBIO and Abeona
arising from the License Agreement, the Arbitrations, and the Enforcement Proceeding. It sets forth all the covenants, promises,
agreements, warranties, representations, conditions and understandings between REGENXBIO and Abeona, and supersedes and
terminates  any  and  all  prior  agreements  and  understandings  between  REGENXBIO  and  Abeona  related  to  the  same  subject
matter.  

No  alteration,  amendment,  change,  or  addition  to  this  Settlement  Agreement  shall  be  binding  on
REGENXBIO  or  Abeona  unless  reduced  to  writing  and  signed  by  the  respective  authorized  officers  of  REGENXBIO  and
Abeona.

(b)

(c)

No waiver of any provision of this Settlement Agreement shall be deemed to be a waiver of any
other provision, whether or not similar.  No such waiver shall constitute a continuing waiver.  No waiver shall be binding unless
executed  in  writing  by  the  party  charged  with  the  waiver.    The  headings  in  this  Settlement  Agreement  are  used  solely  for
convenience and in no way define or limit the scope of this Settlement Agreement.

9.

Confidentiality:  REGENXBIO and Abeona agree to maintain as confidential, and not disclose to any third
party,  any  of  the  terms  of  this  Settlement  Agreement,  provided,  however,  that  the  foregoing  shall  not  prohibit  disclosure,
statements or testimony (a) to entities or persons with a bona fide need to know the terms of this Settlement Agreement who are
subject to an obligation of confidentiality, including but not limited to [****], (b) as may be necessary to comply with, effectuate
or enforce the terms of this Settlement Agreement, (c) in connection with any type of regulatory investigation, examination, or
audit, or (d) as required by law or regulatory requirements, or if otherwise compelled by legal process or court order.  In the event
that a Party is required by law or the rules of the U.S. Securities and Exchange Commission (“SEC”) to make any such disclosure
under  Section  (9)(d),  the  Parties  agree  to  (i)  share  a  draft  in  advance  of  the  issuance  of  such  disclosure  and  take  reasonable
comments from the other Party, and (ii) in the

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

6 of 8

 
 
 
 
 
event  that  any  such  disclosure  requires  filing  of  this  Settlement  Agreement  with  the  SEC,  the  Parties  agree  to  share  proposed
redactions and take reasonable comments from the other Party.  

10.

Non-Disparagement:  The Parties agree not to disparage the other Party, any of the REGENXBIO Released
Parties, any of the Abeona Released Parties, or any of either Party’s products or product candidates, at any time following the
execution  of  this  Settlement  Agreement.    For  clarity,  this  non-disparagement  provision  will  not  preclude  the  Parties  from
providing truthful testimony in any judicial or arbitral proceeding.

11.

Attorneys’ Fees and Costs:  REGENXBIO and Abeona acknowledge that they each have incurred legal fees
and  expenses  in  connection  with  the  Arbitrations,  the  Enforcement  Petition,  and  the  issues  referenced  in  this  Settlement
Agreement.    REGENXBIO  and  Abeona  agree  that  they  each  will  bear  all  of  their  own  legal  fees  and  expenses  related  to  the
Arbitrations, the Enforcement Petition, and this Settlement Agreement.  

12.

Authority  To  Sign  and  Agree:    REGENXBIO  and  Abeona  confirm  and  agree  that  the  individuals  listed
below and who sign this Settlement Agreement are duly authorized to sign on behalf of the Party listed and agree to the terms and
obligations set forth in this Settlement Agreement.  

13.

Time Is of the Essence.  Time is of the essence for performance of this Settlement Agreement, including

without limitation Section 1 of this Settlement Agreement.  

14.

Counterparts:    This  Settlement  Agreement  may  be  executed  in  counterparts,  each  of  which  shall  be  an
original, but such counterparts shall constitute one and the same instrument.  This Settlement Agreement may be executed and
delivered via e-mail with a .pdf file.  The signature of either Party on such document, for purposes hereof, will be considered an
original  signature,  and  the  transmitted  document  will  have  the  same  binding  effect  as  an  original  signature  on  an  original
document.  Delivery of an executed counterpart of a signature page to this Settlement Agreement by e-mail or other electronic
transmission  (including  in  .pdf  format  or  via  DocuSign)  will  be  as  effective  as  delivery  of  a  manually  executed  original
counterpart of each such instrument.

[Remainder of Page Intentionally Left Blank]

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

7 of 8

 
 
 
 
 
 
THE  PARTIES  ACKNOWLEDGE  THAT  THEY  HAVE  READ  THE  FOREGOING  SETTLEMENT  AGREEMENT
AND  ACCEPT  AND  AGREE  TO  ALL  OF  ITS  PROVISIONS.  THE  PARTIES  EXECUTE  THIS  SETTLEMENT
AGREEMENT  VOLUNTARILY,  WITHOUT  ANY  DURESS,  AND  WITH  FULL  UNDERSTANDING  OF  ITS
CONSEQUENCES.

The Parties have executed this Settlement Agreement on the dates indicated below.

Dated: 11/12/2021

Dated: Nov 12th, 2021

REGENXBIO Inc.

By:

/s/ Kenneth Mills

Name: Kenneth Mills

Title:

President & Chief Executive Officer

Abeona Therapeutics Inc.

By:

/s/ Vishwas Seshadri

Name: Vishwas Seshadri

Title:

President & Chief Executive Officer

SETTLEMENT AGREEMENT AND MUTUAL RELEASE

8 of 8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Subsidiaries of REGENXBIO Inc.

EXHIBIT 21.1

Name of Subsidiary

REGENXBIO EU Limited

Jurisdiction of Incorporation or Organization

Ireland

 
 
 
 
 
 
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23.1

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-229910, 333-223466, 333-216508,
333-209899, 333-206984, 333-236664, 333-253725) of REGENXBIO Inc. of our report dated March 1, 2022 relating to the financial
statements and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP 
Washington, D.C.
March 1, 2022

 
 
EXHIBIT 31.1

I, Kenneth T. Mills, certify that:

CERTIFICATION

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of REGENXBIO 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 registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:

a.

b.

c.

d.

designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;

designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant’s internal control over financial reporting.

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.

b.

all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal
control over financial reporting.

Date: March 1, 2022

  /s/ Kenneth T. Mills
Kenneth T. Mills
President and Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
   
 
   
 
 
 
EXHIBIT 31.2

I, Vittal Vasista, certify that:

CERTIFICATION

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of REGENXBIO 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 registrant as of, and for, the periods presented in this report;

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:

a.

b.

c.

d.

designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being prepared;

designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;

evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant’s internal control over financial reporting.

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.

b.

all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal
control over financial reporting.

Date: March 1, 2022

  /s/ Vittal Vasista
Vittal Vasista
Chief Financial Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
   
 
   
 
 
 
CERTIFICATION

EXHIBIT 32.1

In connection with the Annual Report of REGENXBIO Inc. (the “Registrant”) on Form 10-K for the year ended December 31, 2021 as filed with the
Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Kenneth T. Mills, President, Chief Executive Officer and Director
of the Registrant, and Vittal Vasista, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that to their respective knowledge:

(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 results of operations of the
Registrant.

Date: March 1, 2022

Date: March 1, 2022

  /s/ Kenneth T. Mills
  Kenneth T. Mills

President and Chief Executive Officer
(Principal Executive Officer)

  /s/ Vittal Vasista
  Vittal Vasista

Chief Financial Officer
(Principal Financial and Accounting Officer)

This certification is made solely for the purposes of 18 U.S.C. Section 1350, subject to the knowledge standard contained therein, and not for any other
purpose. A signed original of this written statement required by Section 906 has been provided to the Registrant and will be retained by the Registrant and
furnished to the United States Securities and Exchange Commission or its staff upon request.

This certification accompanies the Form 10-K to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be
incorporated by reference into any filing of the Registrant under the Securities Act of 1933 or the Securities Exchange Act of 1934 (whether made before or
after the date of the Form 10-K), irrespective of any general incorporation language contained in such filing.