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Stoke Therapeutics, Inc.

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FY2023 Annual Report · Stoke Therapeutics, Inc.
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UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 
FORM 10-K 

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

For the fiscal year ended December 31, 2023
OR 

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

TRANSITION PERIOD FROM           TO           

Commission File Number 001-38938

Stoke Therapeutics, Inc. 

(Exact name of Registrant as specified in its Charter) 

Delaware
(State or other jurisdiction of
incorporation or organization)

45 Wiggins Ave
Bedford, Massachusetts
(Address of principal executive offices)

47-1144582
(I.R.S. Employer
Identification No.)

01730
(Zip Code)

Registrant’s telephone number, including area code: (781) 430-8200

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

Title of each class

Common Stock, $0.0001 par value per share

Trading
Symbol(s)

STOK

Name of each exchange on which registered

Nasdaq Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None 
Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES ☐ NO ☒
Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES ☐ NO ☒
Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter 
period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES ☒ NO ☐
Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the 
preceding 12 months (or for such shorter period that the Registrant was required to submit such files). YES ☒ NO ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large 
accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer
Non-accelerated filer

  ☐
  ☒
  ☒
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 Exchange Act). YES ☐ NO ☒ 
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously 
issued financial statements. ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during 
the relevant recovery period pursuant to §240.10D-1(b). ☐
The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the shares of common stock on The NASDAQ Stock Market as 
of the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $290 million. The number of shares of Registrant’s Common Stock outstanding as of March 15, 
2024 was 46,303,743.  

  Accelerated filer
  Smaller reporting company
  Emerging growth company

  ☐
  ☒

DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Definitive Proxy Statement relating to the 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated 
herein. The Definitive Proxy Statement will be filed within 120 days of the Registrant’s fiscal year ended December 31, 2023. Except with respect to information specifically incorporated by reference in this 
Form 10-K, the Definitive Proxy Statement is not deemed to be filed as part of this Form 10-K.
Auditor Firm Id:          185          Auditor Name:          KPMG LLP          Auditor Location:          Boston, MA USA

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Table of Contents

Special Note Regarding Forward-Looking statements
PART I
Item 1.
Item 1A.
Item 1B.
Item 1C.
Item 2.
Item 3.
Item 4.

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

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

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

PART IV
Item 15.
Item 16.

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

Exhibits, Financial Statement Schedules
Form 10-K Summary

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FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K contains forward-looking statements within the safe harbor provisions for forward-looking statements contained 
in 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”). All statements other than statements of present and historical facts contained in this Annual Report on Form 10-K, including, but not 
limited to, statements regarding the ability of STK-001 to treat the underlying causes of Dravet syndrome and reduce seizures or show improvements in 
behavior or cognition at the indicated dosing levels or at all, the timing and expected progress of clinical trials, our future results of operations and financial 
position, business strategy, prospective products, planned preclinical studies and clinical or field trials, regulatory approvals, research and development 
costs, and timing and likelihood of success, as well as plans and objectives of management for future operations, may be forward-looking statements. In 
some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “could,” “intend,” 
“target,” “project,” “contemplate,” “believe,” “estimate,” “predict,” “potential” or “continue” or the negative of these terms or other similar expressions, 
although not all forward-looking statements contain these words.

Forward-looking statements are based on our management’s beliefs and assumptions and on information currently available to us. Such statements 

are subject to a number of known and unknown risks, uncertainties and assumptions, and actual results may differ materially from those expressed or 
implied in the forward-looking statements due to various factors, including, but not limited to, those identified in Part II. Item 7. “Management’s 
Discussion and Analysis of Financial Condition and Results of Operations” and Part I. Item 1A “Risk Factors.” These risks and uncertainties include, but 
are not limited to:

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

our ability to become profitable; 

our ability to procure sufficient funding;

our limited operating history; 

the direct and indirect impact of inflation, interest rates, foreign currency exchange rates, instability in the global banking system, 
geopolitical conflict and macroeconomic conditions, including as a result of a potential temporary federal government shutdown, on our 
business, financial condition and operations, including on our expenses, supply chain, strategic partners, research and development costs, 
clinical trials and employees;

our ability to develop, obtain regulatory approval for and commercialize STK-001, STK-002 and our future product candidates; 

our success in early preclinical studies or clinical trials, which may not be indicative of results obtained in later studies or trials;

the success of our collaboration with Acadia Pharmaceuticals and our ability to enter into successful collaborations in the future;

the availability of coverage and adequate reimbursement from third party payors for STK-001, STK-002 and our future product candidates, if 
such products are approved;

our ability to identify patients with the diseases treated by STK-001, STK-002 or our future product candidates, and to enroll patients in 
trials;

the success of our efforts to use TANGO to expand our pipeline of product candidates and develop marketable products;

our ability to obtain, maintain and protect our intellectual property;

our reliance upon intellectual property licensed from third parties;

our ability to identify, recruit and retain key personnel;

our financial performance; and

developments or projections relating to our competitors or our industry.

You should read this Annual Report on Form 10-K and the documents that we reference herein completely and with the understanding that our 

actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements. 
Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of 
any new information, future events, changed circumstances or otherwise.

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Item 1. Business. 

Overview 

PART I

We are a clinical-stage company dedicated to addressing the underlying causes of severe diseases by upregulating protein expression with RNA-

based medicines. Using our proprietary TANGO (Targeted Augmentation of Nuclear Gene Output) approach, we are developing antisense oligonucleotides 
(“ASOs”) to selectively restore protein levels. Our first compound, STK-001, is in clinical testing for the treatment of Dravet syndrome, a severe and 
progressive genetic epilepsy. Dravet syndrome is characterized by frequent, prolonged and refractory seizures beginning within the first year of life. The 
disease is classified as a developmental and epileptic encephalopathy due to the developmental delays and cognitive impairment associated with it.

Dravet syndrome is one of many diseases caused by a haploinsufficiency, in which a loss of approximately 50% of normal protein levels leads to 

disease. We are also pursuing treatment for a second haploinsufficient disease, autosomal dominant optic atrophy (“ADOA”), the most common inherited 
optic nerve disorder. Our initial focus is on haploinsufficiencies and diseases of the central nervous system and the eye, although proof of concept has been 
demonstrated in other organs, tissues, and systems, supporting our belief in the broad potential for our proprietary approach.

Our executive management team has extensive collective expertise in human genetics and modulation of RNA processes using ASOs, as well as a 
track record of success in rare disease drug development. Our executive team and co-founders have been previously involved with other companies in the 
discovery, development and commercialization of many treatments for rare diseases, including Sarepta’s Exondys 51 (eteplirsen) and Biogen’s 
SPINRAZA. Our scientific and clinical advisory boards are comprised of leading experts in the fields of human genetics, pre-mRNA splicing and ASOs, 
and neurodevelopmental and neurodegenerative diseases. Their involvement in both academic research and clinical practice allows us to gain proprietary 
and early insight into emerging biology and clinical practice that informs our business strategy. 

Our strategy 

We are using our proprietary RNA therapeutics platform to create ASOs for the treatment of severe diseases. The critical components of our strategy 

include the following activities: 

•

•

Rapidly advance our lead program, STK-001, to clinical proof-of-concept, approval and commercialization.  Following our announcement in 
March 2024 of end of study data from our Phase 1/2a open-label studies of STK-001 in the United States (MONARCH) evaluating children 
and adolescents ages 2 to 18 with Dravet syndrome and in the United Kingdom (ADMIRAL) evaluating children and adolescents ages 2 to 
up to 18 with Dravet syndrome, we plan to meet with global regulatory authorities to discuss late-stage clinical development of STK-001. We 
are leveraging previously-validated ASO chemistry, a modality that has been successfully utilized for other diseases, a well-defined patient 
population based on routine genetic testing and learnings from approved drugs for the treatment of Dravet syndrome to inform the clinical 
and regulatory pathways for STK-001 and minimize potential safety concerns and development risk. We believe STK-001 has the potential to 
significantly reduce both the occurrence and frequency of seizures and also non-seizure comorbidities. If approved, we intend to leverage a 
lean, targeted internal commercial organization to bring STK-001 to patients.

Advance STK-002 to the clinic, for the potential treatment of ADOA. STK-002 is a proprietary ASO in preclinical development for the 
treatment of ADOA, the most common inherited optic nerve disorder. ADOA represents a second haploinsufficiency disease addressed by 
TANGO and our first treatment for diseases of the eye. STK-002 is designed to upregulate OPA1 protein expression by leveraging the non-
mutant (wild-type) copy of the OPA1 gene. We have received authorization in the United Kingdom to proceed with a Phase 1 open-label 
study (OSPREY) of STK-002 and we expect the study to start in 2024. 

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•

•

•

Expand our pipeline through internal discovery and collaboration to fully exploit the potential of our proprietary platform (TANGO). We 
have built a target discovery process utilizing proprietary bioinformatics algorithms and extensive in-house expertise in whole transcriptome 
RNA sequencing to rapidly and systematically identify diseases that we believe can be addressed using our platform. We are also advancing 
additional early programs focused on multiple targets, including haploinsufficiency diseases of the central nervous system (the “CNS”) and 
eye. In January 2022, we announced a collaboration with Acadia Pharmaceuticals to pursue RNA-based treatments for severe and rare 
genetic neurodevelopmental diseases of the CNS. The collaboration combines our TANGO research platform with Acadia’s expertise in 
neurology drug development and commercialization. Longer-term, we believe that our ASOs may have the potential to upregulate non-
mutated genes in biological pathways to treat diseases or conditions that are caused by multiple genes or are multifactorial. 

Maintain broad commercial rights to our product candidates where we believe we can realize maximum value. We intend to build a fully 
integrated biotechnology company and independently pursue the development and commercialization of our key product candidates, if 
approved. We own commercial rights to our technologies and our lead product candidates, STK-001 and STK-002. As we continue to 
advance our programs, we expect to pursue strategic collaborations to share risk and upside in programs with higher inherent biology risk, 
larger clinical trial sizes or longer or more complex clinical, regulatory or commercial paths. Our current collaboration with Acadia is an 
example of where we believe that the development of treatments for severe and rare genetic neurodevelopmental diseases of the CNS is well 
served by a strategic collaboration. 

Continue to strengthen and expand our intellectual property portfolio. We have an intellectual property estate that includes multi-national 
issued and pending claims for the TANGO mechanisms, as well as multi-national issued and pending claims relating to compositions of 
matter of oligonucleotides designed to target specific TANGO elements in genes for many genetic diseases that we believe are amenable to 
upregulation of target protein expression using TANGO. Our proprietary position is reinforced by additional technical know-how and trade 
secrets. We continually assess and refine our intellectual property strategy as we identify new targets amenable to TANGO, and we will file 
additional patent applications as appropriate. 

Our proprietary RNA therapeutics platform (TANGO) 

TANGO (Targeted Augmentation of Nuclear Gene Output) is our proprietary research platform. Our initial applications for this technology are 

diseases in which one copy of a gene functions normally and the other is mutated, also called haploinsufficiencies. In these cases, the mutated gene does 
not produce its share of protein, so the body does not function normally. Using the TANGO approach and a deep understanding of RNA science, Stoke 
researchers design ASOs that bind to pre-mRNA and help the target genes produce more protein. TANGO aims to restore missing proteins by increasing – 
or stoking – protein output from healthy genes, thus compensating for the non-functioning copy of the gene.

TANGO exploits unique mechanisms for modulation of splicing to prevent the synthesis of naturally occurring non-productive mRNA and increase 

the synthesis of productive mRNA, resulting in increased production of functional protein. 

Human cells naturally regulate protein production to maintain health. Pre-mRNA splicing, including alternative splicing, is an important mechanism 

used to regulate how much protein and which protein variant is produced. During splicing, introns are removed and exons are joined together to generate 
the mRNA template that carries the code to synthesize proteins. More than one third of alternative splicing events in mammals do not produce functional 
proteins and lead to mRNA degradation through nonsense-mediated mRNA decay (“NMD”). TANGO ASOs act at the pre-mRNA level and prevent non-
productive alternative splicing so that the body produces more protein-coding mRNA and thus more protein. This approach is particularly applicable to 
diseases that are caused by insufficient protein production.

In July 2020, we published data in the journal Nature Communications that support our proprietary approach to precisely upregulate protein 

expression using TANGO ASOs. To evaluate the approach broadly, Stoke researchers selected four gene targets that vary in type and abundance of non-
productive splicing events, gene size and protein function: PCCA (propionic acidemia); SYNGAP1 (autosomal dominant mental retardation 5); CD274 
(autoimmune diseases, including uveitis); and SCN1A (Dravet syndrome). Stoke researchers designed TANGO ASOs to target the non-productive splicing 
events in these genes and their activity was evaluated. Dose-dependent reductions of non-productive mRNA were observed to lead to increases in both 
productive mRNA and protein levels for each of the target genes. 

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Treatment of autosomal dominant haploinsufficiency diseases with TANGO ASOs

We are initially focused on applying the transformative potential of our platform to developing precision medicines for autosomal dominant 

haploinsufficiencies, or disorders in which only one allele of a gene is mutated, resulting in approximately 50% of normal protein expression. 

Exhibits 1 and 2 shown below illustrate the TANGO mechanism for increasing protein synthesis in a prospective patient with a haploinsufficiency. 
Exhibit 1 illustrates the prospective patient with a haploinsufficiency possessing one wild-type allele and one mutant allele. The mutant allele is translated 
into non-functional protein and results in approximately 50% of normal protein expression. Exhibit 2 illustrates treatment with our ASO would prevent the 
synthesis of naturally occurring non-productive mRNA and would increase the synthesis of productive mRNA, thereby restoring the target protein to near 
normal levels. Our preclinical studies show that any increase in mutant mRNA would have no effect on the net protein level. 

Exhibit 1: Haploinsufficiency without TANGO-ASO

 Exhibit 2: Haploinsufficiency with TANGO-ASO

TANGO mechanisms of action 

Our ASOs are specifically designed to bind to a desired RNA sequence inside the nuclei of patients’ cells to prevent the occurrence of non-

productive splicing. By doing so, our ASOs decrease the amount of non-productive mRNA and increase the level of productive mRNA, leading to the 
generation of more protein. TANGO operates in a mutation-independent manner, given it utilizes one wild-type allele, and does not alter protein coding 
splicing isoforms. The net effect is increased expression of functional protein from the wild-type allele. 

One category of non-productive splicing events amenable to TANGO is alternative splicing that leads to nonsense-mediated mRNA decay, or NMD, 

of the resulting mRNA. An example of an NMD event is an NMD exon, which is found in over 25% of gene transcripts. NMD exons are part of the wild-
type sequence of the genes. In some cases, NMD exons are part of normal gene regulation. Non-productive mRNA, which includes these NMD exons, is 
degraded in the cytoplasm of the cell by nonsense-mediated mRNA decay and is not translated into protein. Our ASOs bind to the pre-mRNA and redirect 
the splicing machinery to prevent inclusion of the NMD exon. This splice-switching decreases non-productive mRNA and increases productive mRNA, 
which is translated into increased protein expression from the wild-type allele. In contrast to current exon skipping therapies, which remove a coding exon 
and result in a truncated protein, our TANGO mechanism skips out a non-coding NMD exon and yields a full-length functional protein. Our lead product 
candidates, STK-001 and STK-002, target an NMD exon and the general mechanism is shown in exhibits 3 and 4 below, with the left panel showing the 

3

 
 
 
 
 
non-productive mRNA failing to be translated into protein and the right panel showing our ASOs binding to the pre-mRNA and redirecting the splicing 
machinery. 

Exhibit 3: NMD exon without TANGO-ASO

 Exhibit 4: NMD exon with TANGO-ASO

Source: Stoke data

Advantages of TANGO 

We believe TANGO has the ability to address the underlying genetic cause of disease may have several key advantages versus other genetic 

approaches, including: 

•

•

•

•

•

•

Selectively boosts expression only in tissues where the protein is normally expressed.  The activities of our ASOs are inherently tissue-
specific. TANGO-mediated upregulation of protein expression only occurs where the gene is being naturally transcribed, limiting the 
likelihood of expression in non-native tissues.

No observed unwanted off-target effects.  Our ASOs are designed to bind to a specific RNA region to modulate splicing with no observed 
activity on global or closely related genes and minimal off-target cross reactivity to the RNAs from other human genes. 

Utility across small and large gene targets and mutations.  Our ASOs upregulate protein expression regardless of gene size and are not 
constrained to smaller gene targets. Our ASOs also upregulate expression of the wild-type allele, meaning the TANGO mechanism does not 
rely on targeting a specific mutation. Given this, we believe our therapies are well-suited for diseases caused by multiple mutations in a 
single gene, such as many haploinsufficiencies, and provide a single-drug approach that can address the full spectrum of loss-of-function 
mutations.

Does not alter DNA.  Our ASOs do not create detectable changes at the DNA level and make no detectable irreversible modifications to the 
patient’s genome.

Ability to control dose level and duration.  Our ASOs provide the ability for dose titration, thereby allowing for dose-dependent and 
reversible control of level and duration of protein expression. The ability to titrate dosage provides us with flexibility to address a variety of 
tissue types, and potentially enables us to deliver the right dose, at the right location, for each indication.

Simple and scalable manufacturing.  Our novel ASOs are synthesized by highly scalable, solid-phase chemical synthesis and we leverage a 
well-established contract manufacturing base. We believe the manufacturing requirements for our ASOs are much simpler, more scalable and 
more cost-effective than gene therapy and gene editing. 

Our approach 

We employ a systematic and capital-efficient approach to develop ASOs for genetically defined patient populations. We rely on our proprietary 
database to identify novel drug targets and corroborate these findings with existing knowledge to improve our probability of success in the clinic. We 
believe that leveraging our proprietary database and focusing on our core competencies of target identification and clinical and regulatory execution will 
allow us to reduce the time, cost and risks of drug development. 

4

 
 
 
 
Target identification 

We continue to make significant investments in our infrastructure to accelerate the pace and scale of target identification. We have built a significant 
bioinformatics capability, which includes proprietary bioinformatics algorithms and extensive in-house expertise in whole transcriptome RNA sequencing, 
also referred to as RNAseq. RNAseq uses next-generation sequencing to determine the quantity and sequences of RNA in a sample. We leverage large 
internal datasets of RNAseq from key tissues known to be addressable with antisense, such as the CNS, eye, liver and kidney, that are purpose-built to 
enhance the capture of non-productive events. 

We employ machine learning to iteratively refine our search and scoring criteria for the most addressable non-productive mRNA elements based on 

internal target validation and hit identification data. Our technology is amenable to a large number of mutations and can thereby potentially provide a 
single-drug approach for diseases that are caused by many loss-of-function mutations in a single gene. We have identified approximately 1,200 monogenic, 
or single gene, diseases containing at least one NMD-inducing nonproductive event, which we believe may be amenable to TANGO. We believe our 
approach is highly predictive and enables rapid and systematic identification of those targets that are most likely to have clinical relevance, thereby 
increasing the probability for clinical success and accelerating the expansion of our emerging pipeline. 

Hit identification 

Once a TANGO target is validated in cells and tissues that are relevant to the disease, we employ cell lines to rapidly screen for hit ASOs that can 

increase the target protein expression by specifically preventing the occurrence of the non-productive event in the target mRNA. We have also made 
investments in automated equipment to efficiently screen large numbers of ASOs. ASO arrays utilize clinically translatable previously-validated ASO 
chemistries, such as 2’ methoxyethyl phosphorothioate and PMO. Hit compounds are evaluated in vivo to identify lead ASOs that possess suitable efficacy 
and safety to merit preclinical development. Lead ASOs are subsequently evaluated in animal disease models or ex vivo disease model systems. 

Lead evaluation and prioritization 

After we have identified lead compounds, we evaluate and prioritize the advancement of new development candidates based on both program-

specific and portfolio-wide considerations. Program-specific criteria include, among other relevant factors, the severity of the unmet medical need, the 
likelihood of therapeutic utility, the feasibility of clinical development, the costs of development and the commercial opportunity. Portfolio-wide 
considerations include the ability to demonstrate technical success for our platform, thereby increasing the probability of success and learnings for 
subsequent programs. We believe that the learnings from our lead Dravet syndrome program will significantly reduce the uncertainty of development of 
subsequent programs in our pipeline, particularly those targeting the CNS. 

Clinical trial and regulatory execution 

We employ a multi-pronged approach to bring new product candidates forward as rapidly as possible. Our approach leverages previously-validated 
ASO chemistry and a modality that has been successfully utilized for other diseases, to minimize potential safety concerns and development risk. We have 
announced end of study data from two Phase 1/2a open-label studies of STK-001 for Dravet syndrome, MONARCH in the United States and ADMIRAL 
in the United Kingdom, each with primary endpoints common to the trials for approved anti-seizure medications (“ASMs”). Additionally, we plan to design 
clinical trials with the goal of capturing the potential disease-modifying effects of our TANGO therapies.   

Commercialization 

We intend to retain broad commercial rights and independently bring our therapies to patients through a lean, targeted internal commercial 
organization where we believe we can realize maximum value. To do this, we are focused on ensuring that we can effectively identify and access those 
patients who may benefit from our product candidates. We target diseases in which genetic testing is routinely performed, thereby shortening the diagnostic 
odyssey and enabling rapid identification of patients who harbor the relevant genetic mutations. We have partnered with Invitae, a leading genetic 
information company, to provide genetic testing for pediatric epilepsy at no cost to the patient. Lastly, to maximize patient access, we aim to leverage an 
established network of academic and tertiary centers with extensive experience with analogous drug administration. 

5

 
 
Therapeutic focus and product candidates 

We believe our ASOs can be applied to treat a wide range of severe diseases, and we have carefully designed and prioritized our pipeline strategy to 

maximize this opportunity. We are focused on applying the transformative potential of our TANGO platform to developing medicines for patients with 
diseases where the genetic abnormality is known and is found in a single gene. We therefore know for a given disease precisely which gene will need to be 
upregulated, thus mitigating against the uncertainty of the disease biology. We are currently focused on developing product candidates to treat autosomal 
dominant haploinsufficiency diseases, or disorders in which one copy of a gene is mutated and results in approximately 50% of normal protein expression. 
Within haploinsufficiencies, we are prioritizing genetic diseases of the CNS and the eye for our near-term development efforts. 

Our Development Programs

Our technology, development experience and scientific knowledge in the field of biologics, RNA splicing, and antisense oligonucleotide chemistry 

has enabled us to build a pipeline of programs targeting the underlying cause of severe diseases. Exhibit 5 below represents a summary of our programs, 
which are focused on genetic diseases of the CNS and eye. 

Exhibit 5: Pipeline

Source: Stoke corporate presentation, March 2024

STK-001 for the treatment of Dravet syndrome 

STK-001 is an investigational new medicine for the treatment of Dravet syndrome currently being evaluated in ongoing clinical trials. We believe 

that STK-001 has the potential to be the first disease-modifying therapy to address the genetic cause of Dravet syndrome. STK-001 is designed to 
upregulate Nav1.1 protein expression by leveraging the non-mutant (wild-type) copy of the SCN1A gene to restore physiological Nav1.1 protein levels, 
thereby reducing both occurrence of seizures and significant non-seizure comorbidities.

Disease Overview

Dravet syndrome is one of the most severe genetic epilepsies and affects approximately 6.4 in 100,000 people worldwide, including 5-5.5 in 
100,000 people who possess a mutation in the SCN1A gene, according to a 2018 market research report commissioned by us and prepared by Health 
Advances, LLC, or the Health Advances Report. The disease is caused by a pathogenic mutation or deletion of the SCN1A gene in approximately 85% of 
patients. At least 1,700 different de novo mutations in the SCN1A gene have been identified to date in Dravet syndrome patients, including single 
nucleotide substitutions, small insertions or deletions and even whole gene deletions. SCN1A codes for the alpha subunit of the voltage-gated sodium 
channel, or Nav1.1 protein, an ion channel that is essential for the generation and propagation of action potentials. More than 95% of the disease-causing 
mutations of SCN1A cause loss-of-function, resulting in haploinsufficiency (approximately 50% reduction) of the Nav1.1 protein in select neurons in the 
brain. This loss of Nav1.1 channels in inhibitory interneurons and other nerve cells results in Dravet syndrome. 

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Dravet syndrome is characterized by multiple seizure types and may progress to status epilepticus or prolonged seizures lasting more than five 
minutes that require immediate intervention. Patients typically experience their first seizure before 12 months of age. More than 90% of patients suffer 
from at least one non-seizure comorbidity, including severe intellectual and developmental disabilities, motor and speech impairment, autism, attention 
deficit hyperactivity disorder and behavioral difficulties. Neurologic function and cognition are usually normal in children with Dravet syndrome up to two 
years of age. However, nearly all Dravet syndrome patients exhibit intellectual impairment by the age of four, ranging from minor learning difficulty to 
global developmental delay. The time between one year and eight years of age is a critical period for intervention. After eight years of age, nearly all 
Dravet syndrome patients exhibit evidence of substantial developmental delay. The symptoms of the disease result in remarkably low quality of life and 
shortened life expectancy, and as a result impose an immense burden on individuals and families. 

The cognitive impairment in Dravet syndrome is not purely a consequence of seizures. Patients with few seizures have been observed to possess 

severe encephalopathy, and conversely patients with frequent seizures have been observed to exhibit relatively minimal cognitive decline. In addition, there 
does not appear to be a correlation between cognitive outcome and SCN1A mutation type, whether a missense or nonsense mutation. 

Importantly, patients with Dravet syndrome have an increased risk of premature death, primarily due to SUDEP, or Sudden Unexpected Death in 

Epilepsy. Dravet syndrome patients have the highest SUDEP rate of any epilepsy. An analysis of mortality in the Epilepsy Genetics Research Program 
demonstrated a Dravet syndrome-specific mortality rate of 15.84 per 1,000 patient years. SUDEP was the most common cause of premature death among 
Dravet syndrome patients (59%), equating to a Dravet syndrome-specific SUDEP rate of 9.32 per 1,000 patient-years. This is nearly twice the rate for 
adults with refractory epilepsy. 

Patients with Dravet syndrome are often diagnosed by three years of age, and neither patient gender nor family history of seizures is associated with 

risk of Dravet syndrome. Dravet syndrome occurs worldwide and is not concentrated in any particular geographic area or ethnic group. Early diagnosis is 
driven by heightened awareness of Dravet syndrome and other genetic epilepsy disorders as well as an emerging consensus amongst epilepsy specialists 
that early diagnosis is cost-effective and beneficial for prognosis. Among pediatric Dravet syndrome patients, approximately 90% in North America and 
Europe undergo genetic testing as part of their diagnostic work-up, according to a 2021 market research report commissioned by Stoke and prepared by 
Recon Strategy. 

The incidence of Dravet syndrome is approximately 64 per million births, which translates to an overall prevalence of approximately 35,000 patients 

across the United States, Canada, Japan, Germany, France and the United Kingdom, with approximately 16,000 patients in the United States. 

Current treatments 

Current treatments for Dravet syndrome only address the occurrence of seizures, not the underlying cause, and according to a 2017 study as 
published in the Developmental Medicine & Child Neurology Journal, more than 90% of Dravet syndrome patients still report suffering from incomplete 
seizure control with existing ASM regimens. As a result, the current treatment strategy involves the use of multiple ASMs, including combinations of 
cannabidiol, stiripentol, fenfluramine, clobazam, valproate, topiramate and others. Patients are typically treated with two to four drugs administered 
concomitantly, and in most cases the relief provided by polytherapy is insufficient. 

Cannabidiol (Epidiolex), fenfluramine (Fintepla) and stiripentol (Diacomit) are currently the only FDA-approved ASMs for the treatment of Dravet 
syndrome. None of these approved ASMs address the significant non-seizure comorbidities. Moreover, patients are still likely to be affected by non-seizure 
comorbidities and may develop tolerance to these ASMs over time. 

Patients with Dravet syndrome need a novel therapeutic that addresses the genetic basis of the disease and treats the large number of seizures and 

multiple seizure types that persist despite treatment with existing therapy. Importantly, additional therapy options are needed to address the disabling 
comorbidities that occur with Dravet syndrome. If STK-001 is approved by the FDA, we believe our precision medicine approach may have a profound 
impact on individuals and families. 

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Preclinical data 

We have generated compelling preclinical data that demonstrate proof-of-mechanism for STK-001. Our initial target engagement, pharmacology 

and efficacy studies were performed in mice, including both wild-type and a Dravet syndrome mouse model. The targeted non-productive splicing event in 
SCN1A is highly conserved across multiple species, including mouse, non-human primates and humans. The target sequence for STK-001 is also identical 
across species. 

We evaluated STK-001 pharmacology and efficacy in transgenic mice with a heterozygous deletion of Scn1a. This model was created by 
introducing a targeted deletion in the first coding exon of the Scn1a gene; these mice exhibit many aspects of the Dravet syndrome phenotype including 
seizures and premature lethality. 

Neonate (postnatal day two) Dravet syndrome mice and wild-type littermate controls were administered a single dose of either placebo (consisting 

of a phosphate-buffered solution), or 20 µg of STK-001 (n=~50/group) by intracerebroventricular injection. Animals from each group were monitored 
through day 90. Brains were collected from cohorts of these animals at approximately 7 weeks after dosing (placebo: n=11 wild-type mice, n=4 Dravet 
syndrome mice; STK-001: n=9 wild-type mice, n=10 Dravet syndrome mice) and 14 weeks after dosing (placebo: n=10 wild-type mice, n=10 Dravet 
syndrome mice; STK-001: n=10 wild-type mice, n=10 Dravet syndrome mice). Notably, a single injection of STK-001 restored Nav1.1 protein in Dravet 
syndrome mice to levels that are near those of the wild-type mice at both 7 and 14 weeks as shown in exhibit 6. These data demonstrate that STK-001 has 
an impact on Nav1.1 protein expression and we believe this may translate to a favorable dosing regimen in humans. 

Exhibit 6. Increase of Nav1.1 in Dravet Syndrome (DS) mice after a single dose of STK-001 

Source: Han et al., Science Trans Med, 2020

In addition to an increase in the Nav1.1 protein, the administration of a single dose of 20 µg of STK-001 in neonate Dravet syndrome mice (postnatal 

day two) resulted in a significant reduction in premature mortality. Treatment with STK-001 resulted in 97% survival of Dravet syndrome mice for the 90-
day post-natal observation period (survival of 33 out of 34 mice was observed in the STK-001 Dravet syndrome mouse group) compared with 23% survival 
of placebo-treated mice (survival of 14 out of 62 mice). This is illustrated in exhibit 7. 

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Exhibit 7. Reduction in premature mortality in DS mice after administration of STK-001

Source: Han et al., Science Trans Med, 2020

Further preclinical studies of STK-001 have shown significant reductions in seizure frequency in a mouse model of Dravet syndrome (DS). Data 
from electroencephalography (EEG) recordings showed 76% (16/21) of DS mice treated with STK-001 were seizure free compared to 48% (10/21) that 
were treated with a placebo. An 80% reduction in the average number of spontaneous seizures (3 seizures vs 16 seizures) was also observed among treated 
DS mice compared to placebo. EEG is a highly sensitive measure of seizure activity, which enables the detection of seizures that may not be otherwise 
visible. These data are published in Han et al., Science Trans. Med, 2020.

Analyses were also performed in silico to understand the specificity of STK-001. We evaluated STK-001 via bioinformatic analysis against all 
annotated protein-coding genes to predict potential off-target activities. Results showed no perfect 18- to 16-nucleotide match for STK-001 anywhere in the 
transcriptome other than SCN1A pre-mRNA, indicating that STK-001 recognizes a unique sequence in the human transcriptome and should possess 
minimal off-target bindings. 

Further supporting our specificity analysis, we also evaluated brain samples of wild-type neonate mice to ensure that STK-001 does not alter levels 
of other channels in the highly homologous SCN family. Importantly, the mRNA levels of closely related ion channels were not altered in the mouse brain 
five days after administration of 10 µg of STK-001 (n=2/group placebo, n=4/group STK-001), as shown in the figure below. Similar analysis was 
performed in wild-type and Dravet syndrome mice treated with 20 µg of STK-001 at 7 and 14 weeks after dosing. As illustrated in exhibit 8, STK-001 
treated samples showed an increase in expression of the SCN1A gene, but not any of the other SCN family members. These biological studies demonstrate 
that STK-001 is highly specific for SCN1A among the highly homologous family of sodium channel genes, limiting the likelihood of off-target activities. 

9

 
 
 
 
Exhibit 8. Fold change in mRNA of Scn gene family ion channels

Source:  Stoke data.

We also investigated the pharmacology, distribution and tolerability of STK-001 in a study with cynomolgus monkeys. As a pilot experiment, this 

study was not required to be performed under Good Laboratory Practices (“GLP”). Pre-pubescent monkeys (age 2-2.5 years old) were administered a 
single dose of STK-001 (n=3/group; 4 groups dosed) or control solution (n=2/group; 2 groups dosed) by intrathecal injection at a dose range that we 
believe coincides with the estimated therapeutic dose range and stays below the maximum tolerated dose based on tolerability in mice and published data 
for molecules of similar chemistry. The animals were sacrificed at 3 days (n=8) and 29 days (n=8) after dosing. An increase in NaV1.1 levels was observed 
ranging from 1.1-fold to 2.0-fold, compared to the control group, varying by the anatomical region, dose and day of necropsy, with the greatest changes 
observed in the cerebral cortex. The increase in Nav1.1 was also correlated with the presence of STK-001 in brain tissue. Additionally, all doses tested 
showed no drug-related toxicities, including no changes in platelet counts or hepatic function, no clinical signs or symptoms over the 28-day period after 
administration and no abnormal histopathology. 

Single dose GLP toxicology studies in rats and cynomolgus monkeys, that characterized the pharmacology, exposure and tolerability of STK-001 

were included in the investigational new drug application (the “IND”) that was submitted to the FDA in late 2019. Additional multiple dose GLP 
toxicology data have subsequently been submitted to the FDA and the MHRA (U.K. regulatory agency) to support multiple dosing in the clinic, and the 
Company expects to receive data from a second chronic dosing GLP toxicology prior to initiating late-stage clinical development of STK-001.  

Clinical program and data 

We designed our lead product candidate, STK-001, to treat Dravet syndrome, a severe and progressive genetic epilepsy. This program draws on a 

well-defined patient population based on routine genetic testing and learnings from drugs approved for the treatment of Dravet syndrome to inform the 
clinical and regulatory pathways for STK-001. 

We have announced end of study data from two Phase 1/2a open-label studies of STK-001, MONARCH in the United States and ADMIRAL in the 

United Kingdom. The MONARCH study was designed to evaluate single and multiple ascending dose levels of STK-001 administered intrathecally in 
children and adolescents with Dravet syndrome. Patients were eligible for the trial if they were between the ages of 2 and 18, had an established diagnosis 
of Dravet syndrome and had evidence of a pathogenic genetic mutation in the SCN1A gene. Requiring an SCN1A mutation for trial enrollment allows for a 
clear and definitive etiologic diagnosis, a more homogeneous patient population and tailored treatment based on a precision medicine approach. Eligible 
patients also failed at least two epilepsy treatments in the past and currently be taking at least one ASM. The protocol called for all medications and 
interventions to remain unchanged throughout the trials, which allows for assessment of STK-001 with a variety of ASMs. 

The primary objectives were the assessment of the safety and tolerability of STK-001, as well as to characterize blood pharmacokinetics (“PK”) and 
cerebrospinal fluid (“CSF”) exposure levels. A secondary objective was to assess the efficacy of STK-001 as an adjunctive ASM treatment with respect to 
the percent change from baseline in convulsive seizure frequency over a 12-week treatment period. We also measured non-seizure aspects of the disease, 
such as quality of life as secondary endpoints. 

These endpoints as well as other exploratory endpoints will be informed based on our two-year observational study (BUTTERFLY). Enrollment in 

BUTTERFLY is complete and final 2-year data was presented in December 2023. 

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BUTTERFLY was designed to evaluate seizure frequency and non-seizure comorbidities associated with the disease, including motor and speech 
impairment, intellectual and developmental disabilities, behavioral deficits and abnormal sleep patterns. Data from the study will support clinical 
development plans for STK-001. Data from BUTTERFLY suggest that commonly used cognition assessments, Vineland-III (Vineland Adaptive Behavior 
Scale, Third Edition), BSID-III (Bayley Scales of Infant Development, Third Edition), and WPPSI-IV (Wechsler Preschool and Primary Scale of 
Intelligence, Fourth Edition) may be useful for clinical studies assessing neurodevelopment and adaptive behavior in patients with Dravet syndrome. While 
there was heterogeneity across patient scores on clinical measures at baseline, BUTTERFLY patients did not have statistically significant change from 
baseline in the majority of key Vineland-III measures over the 24 months of observation.  Additionally, despite treatment of BUTTERFLY patients with the 
best available anti-seizure medicines, on average the rate of improvement over 24 months on multiple clinical measures, including the Vineland-III, was 
substantially below that of neurotypical peers, and patients continued to experience convulsive seizures over the 24 months at similar frequency to that at 
baseline.

In March 2020, we announced the FDA had placed a partial clinical hold on doses of STK-001 above 20mg in the MONARCH study, pending 

additional preclinical testing to determine the safety profile of higher doses. When intrathecal doses above what the Company expects to administer in the 
clinic were administered to non-human primates (“NHPs”), adverse hind limb paresis was observed. This finding is known to occur following intrathecal 
delivery of ASOs to NHPs and is not known to translate to the human experience. When extremely high dose levels were administered, acute convulsions 
were observed immediately following STK-001 administration. The dose levels were well above the range of corresponding human doses that would ever 
be administered in the clinic and were delivered in a formulation that was at a higher concentration than would be administered in the clinic. There is no 
apparent correlation of these acute adverse events with the mechanism of action of STK-001. 

Since March 2020, the FDA has agreed to allow us to add additional higher dose levels in the United States. Additionally, the Company announced 

in March 2024 that the FDA provided clearance for the evaluation of three doses of 70mg in the MONARCH study and continued dosing of 45mg in our 
SWALLOWTAIL Open Label Extension (“OLE”) study. The FDA partial clinical hold remains in place and limits dosing in the United States to these 
levels. 

The ADMIRAL study was a Phase 1/2a open-label study of children and adolescents ages 2 to <18 who have an established diagnosis of Dravet 
syndrome and have evidence of a genetic mutation in the SCN1A gene. The primary objectives for the study were to assess the safety and tolerability of 
multiple doses of STK-001 up to 70mg, as well as to determine the pharmacokinetics in plasma and exposure in cerebrospinal fluid. A secondary objective 
was to assess the effect of multiple doses of STK-001 as an adjunctive antiepileptic treatment with respect to the percentage change from baseline in 
convulsive seizure frequency over a 24-week treatment period. Non-seizure aspects of the disease, such as overall clinical status and quality of life, were 
also measured as secondary endpoints.

Patients who participated in the MONARCH study in the United States or the ADMIRAL study in the United Kingdom and met study entry criteria 

are eligible to continue treatment in SWALLOWTAIL or LONGWING, respectively, both of which are designed to evaluate the long-term safety and 
tolerability of repeated doses of STK-001. SWALLOWTAIL and LONGWING are also providing information on the preliminary effects of STK-001 on 
both seizures and non-seizure aspects of the Dravet syndrome, such as behavior, cognition, and overall quality of life. Patients in LONGWING currently 
receive chronic dosing of 45mg of STK-001, and in March 2024, we announced that the FDA will allow chronic dosing in SWALLOWTAIL in the United 
States to increase to 45mg as well.

In March 2024, we announced end of study data from the Phase 1/2a open-label studies of STK-001. The pooled data from these studies 
demonstrated that STK-001 was generally well tolerated. 30% (24/81) of the patients experienced a treatment-emergent adverse event that was related to 
study drug, with the most common being CSF protein elevations and procedural vomiting. 22% (18/81) of the patients had a treatment-emergent serious 
adverse event, which were all assessed as unrelated to study drug except for the previously reported case of one patient who experienced Suspected 
Unexpected Serious Adverse Reactions.  

One of several secondary endpoints for these studies was a comparison of the percent change in convulsive seizure frequency as measured by daily 

seizure diaries and calculated over 4-week periods: between baseline and 12 weeks after treatment; and between baseline and end of study. Data from 
patients treated with multiple doses of 70mg of STK-001 demonstrated the most substantial reductions in convulsive seizures on top of the standard of care, 
as illustrated in Exhibit 9 below.

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Exhibit 9. Median reductions in convulsive seizure frequency over time

Patients who were treated with one, two or three doses of 70mg demonstrated substantial reductions in convulsive seizure frequency at three months 

and at six months after the last dose, as shown in Exhibit 10 below.

Exhibit 10. Reductions in convulsive seizure frequency among patients treated with 70mg doses

*Seizure data excluded from month 5-6 for 1 patient because >50% seizure diary was missing 
†Seizure data excluded for 2 patients (1 patient prior to 3m after last dose, 1 prior to 6m after last dose) following a change in  

background antiseizure 

medicines 

Additional data from patients who received cumulative doses of at least 30mg of STK-001 in the Phase 1/2a studies and then continued treatment 

with 30mg or 45mg doses of STK-001 every four months in one of the two OLEs demonstrated durable reductions in convulsive seizure frequency 
throughout the course of treatment, as shown in Exhibit 11 below.

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Exhibit 11. Durable reductions in convulsive seizure frequence in OLE studies

Data from a mixed-effects model for repeated measures analysis of these patients also indicated clinically meaningful improvements from baseline 

over 12 months in the OLEs in multiple measures of cognition and behavior, including multiple sub-domains of the Vineland-III. 

We plan to meet with regulatory authorities to discuss a registrational study design that includes initial doses of 70mg followed by continued dosing 

at 45mg of STK-001 and anticipate providing an update later in 2024. 

STK-002 for the treatment of Autosomal Dominant Optic Atrophy (ADOA)

STK-002 is our lead clinical candidate for the treatment of ADOA. STK-002 is designed to upregulate OPA1 protein expression by leveraging the 

non-mutant (wild-type) copy of the OPA1 gene to restore OPA1 protein expression with the aim to stop or slow vision loss in patients with ADOA. To date, 
we have generated preclinical data demonstrating proof-of-mechanism and proof-of-concept for STK-002. 

Disease Overview

ADOA is the most common inherited optic nerve disorder seen in clinical practice. ADOA causes progressive and irreversible vision loss in both 

eyes starting in the first decade of life. Many children and adults progress to blindness. Roughly half of people with ADOA fail driving standards and up to 
46% are registered as legally blind. The disease affects one in 30,000 people globally with a higher incidence of approximately one in 10,000 in Denmark 
due to a founder effect. 65% to 90% of ADOA is caused by mutations in one allele of the OPA1 gene, most of which lead to haploinsufficiency and disease 
manifestation. More than 400 different OPA1 mutations have been reported in people diagnosed with ADOA. Most mutations result in a severe decrease – 
up to 50% – of the normal amount of the OPA1 protein. There is no strong genotype-phenotype correlation. 

OPA1 is a dynamin-related GTPase that plays a key role in maintaining mitochondria structure and dynamics. The OPA1 protein is imported into the 

mitochondria and is the crucial molecule that mediates inner mitochondria membrane fusion and cristae morphogenesis and is critical for oxidative 
phosphorylation and Adenosine triphosphate (“ATP”) synthesis. Insufficient OPA1 activity causes mitochondria dysfunction with consequent insufficient 
ATP production, excess reactive oxygen species production and eventual cell death. High energy demanding cells such as neurons and cardiomyocytes are 
particularly susceptible to mitochondria dysfunction, and retinal ganglion cells (“RGCs”) are a neuronal cell type most susceptible to loss of OPA1 protein 
as evidenced by RGC death in ADOA caused by OPA1 haploinsufficiency. 

A clinical diagnosis of ADOA is made when a patient meets some or all of the following criteria: pathogenic variant of the OPA1 gene identified in 
the patient or a family member; reduced visual acuity; temporal disc pallor; visual field defect; color vision defect (acquired blue-yellow loss); thinning of 
retinal nerve fiber layer and abnormal visual evoked potentials. Clinical findings are based on: intraocular pressure measurement; visual field assessment; 
color discrimination; dilated slit lamp biomicroscopy; optical coherence tomography; or visual electrophysiology. Patients suspected of having ADOA are 
recommended to receive genetic testing to confirm the clinical diagnosis, help identify other family members who are 

13

 
 
 
affected and ensure patients avoid stressors that could increase disease progression (e.g. smoking, alcohol). The prognosis for many patients with ADOA is 
poor and the rate of visual loss can be difficult to predict given significant inter- and intra-familial variability. 

Current Treatments

There are currently no available treatments for ADOA. Because ADOA causes deterioration of the optic nerves, corrective aids such as glasses or 
contacts do not help to improve vision lost to the disease. Supportive services and low-vision aids are offered for patients with severely decreased visual 
acuity. Our ASOs are designed to target the underlying cause of ADOA, which is OPA1 haploinsufficiency, by decreasing a non-productive mRNA splicing 
event in the OPA1 gene to increase productive OPA1 mRNA and OPA1 protein in the retinal ganglion cells. 

Preclinical data 

We previously identified a novel exon inclusion event (“Exon X”) in OPA1 that leads to non-productive mRNA due to introduction of a premature 
termination codon (“PTC”) (Exhibit 12 below). Our preclinical studies showed that our ASOs blocked the incorporation of Exon X with consequent dose-
dependent increase in productive OPA1 mRNA and protein due to reduction of Exon X-directed NMD of OPA1 mRNA (Exhibit 13 below). We have now 
demonstrated that a single injection of ASO-14 surrogate in the rabbit eye leads to a dose-dependent increase in ASO accumulation in the retina that 
correlated with an increase in target engagement (removal of Exon X) and an increase in OPA1 protein (Exhibit 14 below). The study was conducted using 
female New Zealand white rabbits that were injected with a single dose of vehicle alone or vehicle containing ASO (n=3/group). On Days 15 and 29, the 
retinal tissue was collected and analyzed. Retinal exposure of ASO-14 surrogate (ST-1102) was elevated with increased dosing, dose-dependent target 
engagement was seen at all three time-points examined, and protein increase of OPA1 protein was observed at both Day 15 and Day 29 of the study. We 
further showed that in OPA1 haploinsufficient human cells, ASO-14-mediated increase in OPA1 protein translates to improved mitochondrial function as 
measured by the substantial restoration of ATP levels in the treated cells (Exhibit 15 below). ATP is produced by the mitochondria and is the key energy 
carrying molecule in cells. We observed a 20% ATP deficit in OPA1 +/- HEK293. Treatment with ASO-14 restored ATP levels to ~90% of control cells. 

Exhibit 12: A representation of the non-productive mRNA splicing event in OPA1

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Exhibit 13: Inhibition of NMD with cycloheximide allows for evaluation of the abundance of this event in vitro

Exhibit 14: Rabbit ASO demonstrates dose-dependent OPA1 protein increase in rabbit retina 

Source: Venkatesh A, et al. Antisense oligonucleotide mediated increase of OPA1 expression using TANGO technology for treatment of autosomal dominant optic atrophy. Presented at The 
Association for Research in Vision and Ophthalmology; May 3-7, 2020; Baltimore, MD.

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Exhibit 15: Human ASO demonstrates ATP upregulation in OPA1 haploinsufficient HEK293 cells

Source: Stoke data

In May 2021, we presented new preclinical efficacy data at the Association for Research in Vision and Ophthalmology (ARVO) Annual Meeting 

demonstrating that our TANGO ASOs can increase OPA1 protein levels and improve mitochondrial function in human cells derived from ADOA patients 
with different OPA1 mutations. Exhibit 16 below demonstrates that our TANGO ASO increases OPA1 protein and ATP linked mitochondrial respiration in 
ADOA patient cells.

Exhibit 16: TANGO ASO increases OPA1 protein and ATP linked mitochondrial respiration in ADOA patient cells

Source (left graph): Stoke data Source (right graph): Venkatesh A, et al. Antisense oligonucleotide mediated increase in OPA1 improves mitochondrial function in fibroblasts derived from 
patients with autosomal dominant optic atrophy (ADOA). Presented at The Association for Research in Vision and Ophthalmology; May 1-7, 2021.

In May 2022, we presented further preclinical data for STK-002 demonstrating in-vivo, dose-related target engagement and OPA1 protein 
upregulation with sustained effect in NHP retinal tissue following administration of STK-002 (Exhibit 17). Additionally, a dose-related increase in OPA1 
protein was detected in retinal ganglion cells of NHPs treated with STK-002.

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Exhibit 17. Dose-related target engagement and OPA1 protein upregulation in retinal tissue of NHPs following IVT administration of STK-002 

Source Venkatesh A, et al. STK-002, an Antisense Oligonucleotide (ASO) for the Treatment of Autosomal Dominant Optic Atrophy (ADOA), is Taken Up by Retinal Ganglion Cells (RGC) and 
Upregulates OPA-1 Protein Expression After Intravitreal Administration to Non-human Primates (NHPs). ASGCT; May 16-19, 2022.

Clinical Plans

We have completed enrolled (n=48) across 10 sites in the United States, United Kingdom, Italy and Denmark in our two-year prospective natural 

history study of people ages 8 to 60 who have a confirmed diagnosis of ADOA that is caused by an OPA1 mutation (FALCON study). The FALCON study 
is designed to evaluate the rate of change in structural and functional ophthalmic assessments. Data collected from the FALCON study will support the 
clinical development of STK-002. 

We have also received authorization in the United Kingdom to proceed with a Phase 1 open-label study (OSPREY) of children and adults ages 6 to 

55 who have an established diagnosis of ADOA and have evidence of a genetic mutation in the OPA1 gene. The primary objectives for the study are to 
assess the safety and tolerability of single ascending doses of STK-002, as well as to determine the exposure in blood. A secondary objective is to assess 
efficacy following intravitreal administration of STK-002 in one eye of each patient as measured by changes in visual function and ocular structure as well 
as quality of life in patients with ADOA. We expect the OSPREY study to start in 2024.

Additional product opportunities 

We are also advancing additional programs focused on multiple targets, including haploinsufficiency diseases of the CNS and eye. These tissues are 

affected in many severe genetic diseases. 

Longer-term, we believe that ASOs designed using TANGO may have the potential to upregulate non-mutated genes in biological pathways to treat 
both rare and non-rare diseases or conditions that are caused by multiple genes or that are multifactorial. For these diseases, we intend to opportunistically 
secure partnerships with biopharmaceutical partners whose scientific, development or commercial capabilities complement our own. 

Acadia License and Collaboration Agreement

In January 2022, we entered into a license and collaboration agreement with Acadia Pharmaceuticals Inc. (“Acadia”) for the discovery, development 

and commercialization of novel RNA-based medicines for the treatment of severe and rare genetic neurodevelopmental diseases of the CNS. The 
agreement focuses on the targets SYNGAP1, MECP2 (Rett syndrome), and an undisclosed neurodevelopmental target of mutual interest. In connection 
with each target, we will collaborate with Acadia to identify potential treatments for further development and commercialization as licensed products. With 
respect to SYNGAP1, we have agreed with Acadia to co-develop and co-commercialize licensed products for such target globally, and in connection 
therewith we granted to Acadia worldwide, co-exclusive (with us) licenses for such 

17

 
 
 
 
licensed products. With respect to MECP2 and the neurodevelopmental target, we granted to Acadia worldwide, exclusive licenses to develop and 
commercialize licensed products for such targets. 

Pursuant to the terms of the agreement, we received an upfront payment of $60.0 million from Acadia. Acadia agreed to fund the research to 
identify potential licensed products for MECP2 and the neurodevelopmental target, and we will equally fund with Acadia the research to identify potential 
licensed products for SYNGAP1. We are eligible to receive up to $907.5 million in potential total milestone payments based upon the achievement of 
certain development, regulatory, first commercial sales and sales milestone events across the programs for the three targets, assuming each milestone were 
achieved at least once. With respect to licensed products for MECP2 and the neurodevelopmental target, we are also eligible to receive tiered royalties at 
percentages ranging from the mid-single digits to the mid-teens on future net sales by Acadia of licensed products worldwide. Royalties payable under the 
agreement are subject to standard royalty reductions. For SYNGAP1 licensed products that we are co-developing and co-commercializing, we will be 
responsible for 50% of the development and commercialization costs and will receive 50% of the profits from global commercialization.

With respect to each SYNGAP1 licensed product being co-developed or co-commercialized, the agreement will remain in effect, unless earlier 

terminated, until the parties have agreed to permanently abandon the further development and commercialization of such licensed product. With respect to 
licensed products for MECP2 and the neurodevelopmental target, the agreement will remain in effect, unless earlier terminated, until the expiration, on a 
country-by-country and licensed product-by-licensed product basis, of the applicable royalty term, at which point the license for such licensed product shall 
become fully paid-up, royalty-free, perpetual and irrevocable in such country.

The agreement also contains customary provisions for termination by Acadia for convenience and by either party for cause, including for material 

breach (subject to cure). We have standard reversion rights in connection with certain early termination events.

SYNGAP1 syndrome is a rare neurological disorder characterized by moderate to severe intellectual disability that is evident in early childhood. 

Mutations in the SYNGAP1 gene (which produces the SynGAP protein) were first identified in 2009 and since then, an increasing number of children with 
SYNGAP1 syndrome have been identified. Normal levels of SynGAP protein are essential for proper brain function and development. Mutations in the 
SYNGAP1 gene also play an important role in the development of epileptic encephalopathies (DEEs). The severity and onset of symptoms can vary from 
patient to patient. SYNGAP1 syndrome is characterized by developmental delay or intellectual disability, generalized epilepsy, and autism spectrum 
disorder (ASD) and other behavioral abnormalities. More than 80% of cases of SYNGAP1 syndrome are caused by a haploinsufficiency of the SYNGAP1 
gene. SYNGAP1 syndrome is estimated to account for 1% to 2% of all intellectual disability cases. There are currently no approved treatments for 
SYNGAP1 syndrome.

Rett syndrome is a rare, debilitating neurological disorder that occurs primarily in females following apparently normal development for the first six 

months of life. Rett syndrome is often misdiagnosed as autism, cerebral palsy, or non-specific developmental delay. Rett syndrome is caused by mutations 
on the X chromosome on a gene called MECP2. There are more than 200 different mutations found on the MECP2 gene that interfere with its ability to 
generate a normal gene product. Rett syndrome occurs worldwide in approximately one of every 10,000 to 15,000 female births and in the United States 
impacts 6,000 to 9,000 patients. Rett syndrome causes problems in brain function that are responsible for cognitive, sensory, emotional, motor and 
autonomic function. Typically, with symptoms presenting between 6 to 18 months of age, patients experience a period of rapid decline with loss of 
purposeful hand use (fine motor skills), development of hand stereotypies, absent or impaired mobility (gross motor skills), loss of communication skills 
(including eye contact) and inability to independently conduct activities of daily living. Symptoms also include seizures, disorganized breathing patterns, an 
abnormal side-to-side curvature of the spine (scoliosis), and sleep disturbances. Currently, there are no FDA-approved medicines for the treatment of Rett 
syndrome.

Manufacturing 

We currently contract with third parties to manufacture our products undergoing late-preclinical and clinical testing and anticipate using third parties 

for all commercial manufacturing. We do not own or operate facilities for product manufacturing, packaging, storage and distribution, or testing. We have 
personnel with extensive technical, manufacturing, analytical and quality experience and good project management to oversee contract manufacturing and 
testing activities. We will continue to expand and strengthen our network of third-party providers but may also consider investing in additional internal 
manufacturing capabilities in the future if there is a technical need, or a strategic or financial benefit. 

Manufacturing is subject to extensive regulations that impose procedural and documentation requirements. At a minimum these regulations govern 

record keeping, manufacturing processes and controls, personnel, quality control and quality assurance. Our systems, procedures and contractors are 
required to be in compliance with these regulations and are assessed through regular monitoring and formal audits. 

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Drug substance 

Oligonucleotide drug substance requirements for our most advanced programs can be readily met by a variety of domestic and international 
contractors. Many of these contractors are also able to source all the required raw materials, which allows us to consolidate raw material procurement and 
drug substance manufacturing activities with a single supplier. To ensure supply chain continuity, we plan to establish supply agreements with alternative 
suppliers as appropriate. As part of each development program, efforts will be made to invest in process changes to improve purity and yield as warranted. 

Future drug substance compositions may require different manufacturing capabilities, which will be addressed through either expanded capability 

with existing contractors or establishing manufacturing supply relationships with new contractors. These changes in composition may also require new 
supply chain agreements with contractors that specialize in raw material manufacturing. Our internal personnel will work to identify and establish 
relationships with contractors that may be ideally suited to meeting these new manufacturing requirements. 

Drug product 

For the near future, we expect all our oligonucleotide drug products to consist of drug substance formulated in either saline, buffered saline, or some 

other diluent appropriate for intrathecal, intravitreal, subcutaneous, or intravenous injection. These types of formulations can be manufactured using 
common processes and readily available materials. We are establishing agreements with a variety of contractors that are suitably equipped to manufacture, 
package, and test these types of oligonucleotide drug product formulations for subsequent shipment to clinical sites. Several of these manufacturers would 
also be capable of formulation and packaging for commercial use. 

Competition 

The biotechnology and biopharmaceutical industries, and the genetic medicines fields, are characterized by rapid evolution of technologies, fierce 

competition and strong defense of intellectual property. Any product candidates that we successfully develop and commercialize will have to compete with 
existing therapies and new therapies that may become available in the future. While we believe that our technology, development experience and scientific 
knowledge in the field of biologics, RNA splicing, and antisense oligonucleotide chemistry provide us with competitive advantages, we face potential 
competition from many different sources, including major pharmaceutical, specialty pharmaceutical and biotechnology companies, academic institutions 
and governmental agencies, and public and private research institutions that conduct research, seek patent protection, and establish collaborative 
arrangements for research, development, manufacturing and commercialization. 

While therapeutic modalities, including gene therapy, gene editing, modified RNA and protein-based drugs, are currently being developed to address 

monogenic diseases, most of these approaches are focused on autosomal recessive or autosomal dominant gain-of-function diseases. The nature and 
fundamental limitations of these approaches make them less suited for addressing the underlying cause of autosomal dominant haploinsufficiencies. Other 
next generation antisense oligonucleotides have also generally had limited success in upregulating gene expression of haploinsufficiencies, due to a focus 
on indirectly and weakly validated mechanisms of action such as targeting microRNAs or long non-coding RNAs that are associated with a gene transcript. 
We are pioneers in developing disease-modifying therapies to treat haploinsufficiencies and are uniquely positioned to exploit this significant opportunity 
with our TANGO platform. 

If our current product candidate, STK-001, is approved for the treatment of Dravet syndrome, it may compete with other products currently 
marketed or in development. Currently marketed ASMs range from cannabidiols, such as Jazz Pharmaceuticals’ Epidiolex, Fintepla® (fenfluramine) from 
UCB, to GABA receptor agonists, such as clobazam and stiripentol, to glutamate blockers, such as topiramate. Companies such as Ovid 
Therapeutics/Takeda, Xenon Pharmaceuticals, Eisai Pharmaceuticals, Epygenix, Longboard Pharmaceuticals, CAMP4, Encoded Therapeutics and others 
are also developing treatments for Dravet syndrome. Many of the currently marketed ASMs are available as generics. In addition, numerous compounds are 
in clinical development for treatment of epilepsy. To our knowledge, the clinical development pipeline for non-disease modifying therapies includes 
cannabinoids, 5-HT release stimulants, cholesterol 24-hydroxylase inhibitors, potassium channel openers, and sodium channel antagonists from a variety of 
companies. Importantly, we believe none of the drugs in clinical development address the underlying genetic cause of Dravet syndrome. However, one 
company (Encoded Therapeutics) has announced a clinical development plan for a gene regulation therapy program in Dravet syndrome that may address 
the underlying genetic cause of Dravet syndrome. 

Our second product candidate, STK-002, is in development for treatment of ADOA. There are no products currently marketed or in clinical 

development for treatment of ADOA. To our knowledge, there are also very limited preclinical 

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development efforts beyond our product candidate. We believe that PYC Therapeutics is developing a cell penetrating peptide PMO conjugated to ASO for 
the treatment of ADOA. 

Many of our competitors, either alone or with strategic partners, have substantially greater financial, technical, and human resources than we do. 
Accordingly, our competitors may be more successful than us in research and development, manufacturing, preclinical testing, conducting clinical trials, 
obtaining approval for treatments and achieving widespread market acceptance, rendering our treatments obsolete or non-competitive. Merger and 
acquisition activity in the biotechnology and biopharmaceutical industries may result in even more resources being concentrated among a smaller number 
of our competitors. These companies also compete with us in recruiting and retaining qualified scientific and management personnel, establishing clinical 
trial sites and patient registration for clinical trials and acquiring technologies complementary to, or necessary for, our programs. Smaller or early-stage 
companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. Our 
commercial opportunity could be substantially limited if our competitors develop and commercialize products that are more effective, safer, less toxic, 
more convenient or less expensive than our comparable products. In geographies that are critical to our commercial success, competitors may also obtain 
regulatory approvals before us, resulting in our competitors building a strong market position in advance of the entry of our products. In addition, our 
ability to compete may be affected in many cases by insurers or other third-party payors seeking to encourage the use of other drugs. The key competitive 
factors affecting the success of all of our programs are likely to be their efficacy, safety, convenience and availability of reimbursement. 

Reimbursement 

The regulations that govern pricing and reimbursement for new drugs vary widely from country to country. Some countries require approval of the 

sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing approval is granted. In some foreign 
markets, prescription biopharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. As a result, a 
drug company can obtain regulatory approval for a product in a country, but then be subject to price regulations that delay commercial launch of that 
product. 

A drug company’s ability to commercialize any products successfully will also depend in part on the extent to which coverage and adequate 
reimbursement for these products and related treatments will be available from third-party payors, including government authorities, such as Medicare and 
Medicaid, private health insurers and other organizations. Patients who are provided medical treatment for their conditions generally rely on third-party 
payors to reimburse all or part of the costs associated with their treatment. Coverage and adequate reimbursement from third-party payors are critical to 
new product acceptance. Even if one or more products are successfully brought to the market, these products may not be considered cost effective, and the 
amount reimbursed for such products may be insufficient to allow them to be sold on a competitive basis. Third-party payors who reimburse patients or 
healthcare providers, such as government plans, are requiring that drug companies provide them with predetermined discounts from list prices and are 
seeking to reduce the prices charged or the amounts reimbursed for biopharmaceutical products. 

Significant delays can occur in obtaining reimbursement for newly-approved drugs or therapeutic biologics, and coverage may be more limited than 

the purposes for which the drug or therapeutic biologic is approved by the FDA or similar foreign regulatory authorities. Moreover, eligibility for 
reimbursement does not imply that any drug will be reimbursed in all cases or at a rate that covers a drug company’s costs, including research, 
development, manufacture, sale and distribution. 

Interim reimbursement levels for new drugs, if applicable, may also be insufficient to cover a drug company’s costs and may not be made 
permanent. Reimbursement rates may be based on payments allowed for lower cost drugs or therapeutic biologics that are already reimbursed, may be 
incorporated into existing payments for other services and may reflect budgetary constraints or imperfections in Medicare data. Net prices for drugs or 
therapeutic biologics may be reduced by mandatory discounts or rebates required by government healthcare programs or private payors and by any future 
relaxation of laws that presently restrict imports of drugs or therapeutic biologics from countries where they may be sold at lower prices than in the United 
States. Further, no uniform policy for coverage and reimbursement exists in the United States. Third-party payors often rely upon Medicare coverage policy 
and payment limitations in setting their own reimbursement rates, but also have their own methods and approval process apart from Medicare 
determinations. Therefore, coverage and reimbursement can differ significantly from payor to payor. 

Intellectual Property 

We strive to protect and enhance the proprietary technology, inventions and improvements that are commercially important to our business, 
including obtaining, maintaining and defending patent rights, whether developed internally or licensed from third parties. Our policy is to seek to protect 
our proprietary position by, among, other methods, pursuing and 

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obtaining patent protection in the United States and in jurisdictions outside of the United States related to our proprietary technology, inventions, 
improvements, platforms and product candidates that are important to the development and implementation of our business. Our patent portfolio, including 
in-licensed patents and patent applications, is intended to cover, but is not limited to, our technology platforms, product candidates and components thereof, 
their methods of use and processes for their manufacture, and any other inventions that are commercially important to our business. We also rely on trade 
secret protection of our confidential information and know-how relating to our proprietary technology, platforms and product candidates, continuing 
innovation, and in-licensing opportunities to develop, strengthen, and maintain our position in our TANGO platform and product candidates. Our 
commercial success may depend in part on our ability to obtain and maintain patent and other proprietary protection for our technology, inventions and 
improvements; to preserve the confidentiality of our trade secrets; to maintain our licenses to use intellectual property owned or controlled by third parties; 
to defend and enforce our proprietary rights, including our patents; to defend against challenges and assertions by third parties of their purported 
intellectual property rights; and to operate without infringement of valid and enforceable patents and other proprietary rights of third parties. 

With respect to our TANGO platform, we have exclusively licensed intellectual property for our TANGO technology from the University of 
Southampton, which includes issued U.S. and foreign patents and pending U.S. and foreign patent applications that cover the TANGO mechanisms. As of 
December 31, 2023, the issued U.S. patents, issued foreign patents, pending U.S. patent applications and pending foreign patent applications that we have 
licensed from the University of Southampton are anticipated to expire between 2035 and 2036, absent any patent term adjustments or extensions. 

Separately, we have obtained patents and filed patent applications with claims that are intended to cover compositions of matter of oligonucleotides 
designed to target specific elements in genes for many genetic diseases that we believe are amenable to upregulation of target protein expression using our 
TANGO platform. As of December 31, 2023, the issued U.S. patents, the issued foreign patents and any patents that may issue from the currently pending 
patent applications, including PCT international applications, U.S. patent applications, and foreign patent applications, are expected to expire between 2036 
and 2044, absent any patent term adjustments or extensions.

With respect to STK-001, as of December 31, 2023, we have exclusively licensed U.S. patents that cover the mechanism of action of STK-001, as 
well as foreign patents and pending foreign patent applications. The issued patents and any patents that may issue from these pending patent applications 
are expected to expire between 2035 and 2036, absent any patent term adjustments or extensions. As of December 31, 2023, we also own U.S. patents, a 
pending PCT international application, pending U.S. patent applications, foreign patents and pending foreign patent applications relating to STK-001, and 
the U.S. patents any patents that may issue from these pending patent applications are expected to expire between 2038 and 2044, absent any patent term 
adjustments or extensions.

With respect to STK-002, as of December 31, 2023, we have exclusively licensed U.S. patents that cover the mechanism of action of STK-002, as 
well as foreign patents and pending foreign patent applications. The issued patents and any patents that may issue from these pending patent applications 
are expected to expire between 2035 and 2036, absent any patent term adjustments or extensions. As of December 31, 2023, we also own issued U.S. and 
foreign patents, a pending PCT international application, pending U.S. patent applications, and pending foreign patent applications relating to STK-002, 
and any patents that may issue from these pending patent applications are expected to expire between 2038 and 2044, absent any patent term adjustments or 
extensions.

The term of individual patents depends upon the laws of the countries in which they are obtained. In most countries in which we file, the patent term 

is 20 years from the earliest date of filing of a non-provisional patent application. However, the term of United States patents may be extended for delays 
incurred due to compliance with the FDA requirements or by delays encountered during prosecution that are caused by the United States Patent and 
Trademark Office (the “USPTO”). For example, for drugs that are regulated by the FDA under the Hatch-Waxman Act, it is permitted to extend the term of 
a patent that covers such drug for up to five years beyond the normal expiration date of the patent. For more information on patent term extensions, see 
“Business—Government regulation: The Hatch-Waxman Act—Patent term extension”. In the future, if and when our biopharmaceutical product candidates 
receive FDA approval, we expect to apply for patent term extensions on patents covering those product candidates. We intend to seek patent term 
extensions to any of our issued patents in any jurisdiction where these are available; however, there is no guarantee that the applicable authorities, including 
the USPTO and FDA, will agree with our assessment of whether such extensions should be granted, and even if granted, the length of such extensions. Our 
currently issued patents will likely expire on dates ranging from 2035 to 2041, unless we receive patent term extension or patent term adjustment, or both. 
If patents are issued on our pending patent applications, the resulting patents are projected to expire on dates ranging from 2036 to 2044, unless we receive 
patent term extension or patent term adjustment, or both. However, the actual protection afforded by a patent varies on a product-by-product basis, from 
country-to-country, and depends upon many factors, including the type of patent, the scope of its coverage, the availability of regulatory-related extensions, 
the availability of legal remedies in a particular country and the validity and enforceability of the patent. 

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The patent positions of companies like ours are generally uncertain and involve complex legal and factual questions. No consistent policy regarding 
the scope of claims allowable in patents in the field of genetic therapy has emerged in the United States. The patent situation outside of the United States is 
even more uncertain. Changes in the patent laws and rules, either by legislation, judicial decisions, or regulatory interpretation in the United States and 
other countries may diminish our ability to protect our inventions and enforce our intellectual property rights, and more generally could affect the value of 
our intellectual property. In particular, our ability to stop third parties from making, using, selling, offering to sell, importing or otherwise commercializing 
any of our patented inventions, either directly or indirectly, will depend in part on our success in obtaining, defending and enforcing patent claims that 
cover our technology, inventions, and improvements. With respect to both licensed and company-owned intellectual property, we cannot be sure that 
patents will be granted with respect to any of our pending patent applications or with respect to any patent applications filed by us in the future, nor can we 
be sure that any of our existing patents or any patents that may be granted to us in the future will be commercially useful in protecting our platform and 
product candidates and the methods used to manufacture them. Moreover, our issued patents and those that may issue in the future may not guarantee us the 
right to practice our technology in relation to the commercialization of our platform’s product candidates. The area of patent and other intellectual property 
rights in biotechnology is an evolving one with many risks and uncertainties, and third parties may have blocking patents that could be used to prevent us 
from commercializing our TANGO platform and product candidates and practicing our proprietary technology. Our issued patents and those that may issue 
in the future may be challenged, narrowed, circumvented or invalidated, which could limit our ability to stop competitors from marketing related platforms 
or product candidates or limit the length of the term of patent protection that we may have for our TANGO platform and product candidates. In addition, 
the rights granted under any issued patents may not provide us with protection or competitive advantages against competitors with similar technology. 
Furthermore, our competitors may independently develop similar technologies. For these reasons, we expect to have competition for our TANGO platform 
and product candidates. Moreover, because of the extensive time required for development, testing and regulatory review of a potential product, it is 
possible that before any product candidate can be commercialized, any related patent may expire or remain in force for only a short period following 
commercialization, thereby reducing any advantage of the patent. For this and other risks related to our proprietary technology, inventions, improvements, 
platforms and product candidates, please see the section entitled “Risk Factors—Risks Related to our Intellectual Property.” 

We have filed for trademark protection of the “Stoke Therapeutics” mark with the United States Patent and Trademark Office and foreign trademark 

organizations. We have registered, and intend to maintain, the trademark “Stoke Therapeutics” in the United States Patent and Trademark Office and in 
numerous other jurisdictions, including but not limited to the European Union, China, India, and Canada.

We also rely on trade secret protection for our confidential and proprietary information. Although we take steps to protect our confidential and 

proprietary information as trade secrets, including through contractual means with our employees, consultants, outside scientific collaborators, sponsored 
researchers and other advisors, third parties may independently develop substantially equivalent proprietary information and techniques or otherwise gain 
access to our trade secrets or disclose our technology. Thus, we may not be able to meaningfully protect our trade secrets. It is our policy to require our 
employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to execute confidentiality agreements under the 
commencement of employment or consulting relationships with us. These agreements provide that all confidential information concerning our business or 
financial affairs developed or made known to the individual during the individual’s relationship with us is to be kept confidential and not disclosed to third 
parties except in specific circumstances. In the case of employees, the agreements provide that all inventions conceived by the individual, and which are 
related to our current or planned business or research and development or made during normal working hours, on our premises or using our equipment or 
proprietary information, are our exclusive property. In many cases our confidentiality and other agreements with consultants, outside scientific 
collaborators, sponsored researchers and other advisors require them to assign or grant us licenses to inventions they invent as a result of the work or 
services they render under such agreements or grant us an option to negotiate a license to use such inventions. Despite these efforts, we cannot provide any 
assurances that all such agreements have been duly executed, and any of these parties may breach the agreements and disclose our proprietary information, 
and we may not be able to obtain adequate remedies for such breaches. 

We also seek to preserve the integrity and confidentiality of our proprietary technology and processes by maintaining physical security of our 
premises and physical and electronic security of our information technology systems. Although 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. To the extent that our employees, 
contractors, consultants, collaborators and advisors use intellectual property owned by others in their work for us, disputes may arise as to the rights in 
relation to the resulting know-how or inventions. For more information, please see the section entitled “Risk Factors – Risks Related to our Intellectual 
Property.” 

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License and research agreements 

In July 2015, the Company entered into a worldwide license agreement with CSHL (the “CSHL Agreement”), with respect to TANGO patents. 
Under the CSHL Agreement, the Company received an exclusive (except with respect to certain government rights and non-exclusive licenses), worldwide 
license under certain patents and applications relating to TANGO. The CSHL Agreement obligated the Company to make payments that are contingent 
upon certain milestones being achieved. The Company was also required to pay royalties, tiered based on the scope of patent coverage for each licensed 
product, ranging from a low-single digit percentage to a mid-single digit percentage on annual net sales. These royalty obligations applied on a licensed 
product-by-licensed product and country-by-country basis until the latest of (i) the expiration of the last valid claim of a CSHL patent covering the 
applicable licensed product or (ii) the expiration of any regulatory exclusivity for the applicable licensed product. In addition, if the Company sublicensed 
the rights under the CSHL Agreement, it was required to pay a maximum of twenty percent of the sublicense revenue to CSHL, which may have been 
reduced to a mid-teens or a mid-single digit percentage upon achievement of certain clinical milestones for the applicable licensed product. Finally, the 
Company was required to pay an annual license maintenance fee of $0.01 million, which amount is creditable against any owed royalty or milestone 
payments. The maximum aggregate potential milestone payments payable totaled approximately $0.90 million. Additionally, certain licenses under the 
CSHL Agreement required the Company to reimburse CSHL for certain past and ongoing patent related expenses, however there were no expenses related 
to these reimbursable patent costs during the years ended December 31, 2023 and 2022. After the completion of a 90-day waiting period, in May 2023 the 
Company terminated the CSHL Agreement. The Company does not expect the termination of the CSHL Agreement to have a significant impact on the 
intellectual property underlying any of its current product candidates, including STK-001 and STK-002, or its continued development of the TANGO 
platform.

In April 2016, the Company entered into an exclusive, worldwide license agreement with the University of Southampton (the “Southampton 
Agreement”), whereby the Company acquired rights to foundational technologies related to the Company’s TANGO technology. Under the Southampton 
Agreement, the Company receives an exclusive, worldwide license under certain licensed patents and applications relating to TANGO. Under the 
Southampton Agreement, the Company may be obligated to make additional payments that are contingent upon certain milestones being achieved, as well 
as royalties on future product sales. These royalty obligations survive until the latest of (i) the expiration of the last valid claim of a licensed patent covering 
a subject product or (ii) the expiration of any regulatory exclusivity for the subject product in a country. In addition, if the Company sublicenses its rights 
under the Southampton Agreement, the Company is required to pay a mid-single digit percentage of the sublicense revenue to the University of 
Southampton. As of December 31, 2023, the Company had paid $0.7 million under the Southampton Agreement as a result of entering into the Acadia 
Pharmaceuticals Inc. license and collaboration agreement in January 2022 (see Note 8). Additionally, certain licenses under the Southampton Agreement 
require the Company to reimburse the University of Southampton for certain past and ongoing patent related expenses. For the year ended December 31, 
2023 these expenses were $0.2 million compared to $0.02 million for the year ended December 31, 2022.

Government Regulation 

FDA approval process 

In the United States, pharmaceutical products are subject to extensive regulation by FDA. The Federal Food, Drug, and Cosmetic Act (the “FDCA”) 

and other federal and state statutes and regulations govern, among other things, the research, development, testing, manufacture, storage, recordkeeping, 
approval, labeling, promotion and marketing, distribution, post-approval monitoring and reporting, sampling and import and export of pharmaceutical 
products. Failure to comply with applicable U.S. regulations may subject a company to a variety of administrative or judicial sanctions, such as a clinical 
hold, FDA refusal to approve pending new drug applications, or NDAs, warning or untitled letters, product recalls, product seizures, total or partial 
suspension of production or distribution, injunctions, fines, civil penalties and criminal prosecution. 

Pharmaceutical product development for a new product or certain changes to an approved product in the U.S. typically involves preclinical 
laboratory and animal testing followed by submission to the FDA of an IND which must become effective before clinical testing may commence. Data 
from adequate and well-controlled clinical trials are required to demonstrate the safety and effectiveness of the drug for each indication for which FDA 
approval is sought. Satisfaction of FDA pre-market approval requirements typically takes many years and the actual time required may vary substantially 
based upon the type, complexity and novelty of the product or disease. 

Preclinical requirements include laboratory evaluation of product chemistry, formulation, pharmacology and toxicity studies in animal trials to 

assess the characteristics and potential safety and efficacy of the product. The conduct of the preclinical tests must comply with federal regulations and 
requirements, including GLP. The results of preclinical testing are submitted to FDA as part of an IND along with other information, including information 
about product chemistry, 

23

 
 
manufacturing and controls, and a proposed clinical trial protocol. Long-term preclinical tests, such as animal tests of reproductive toxicity and 
carcinogenicity, may continue after the IND is submitted. 

A 30-day waiting period after the submission of each IND is required prior to the commencement of clinical testing in humans. The clinical trial 

proposed in the IND may begin after a safe to proceed communication is received from the FDA.

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

The FDA may order a clinical hold, which is the temporary, or permanent, discontinuation of a clinical trial at any time, or impose other sanctions, if 

it believes that the clinical trial either is not being conducted in accordance with FDA requirements or presents an unacceptable risk to the clinical trial 
patients. If FDA imposes a clinical hold, clinical trials cannot commence or recommence without FDA authorization and then only under terms authorized 
by the FDA. The study protocol and informed consent information for patients in clinical trials must also be submitted to an institutional review board 
(“IRB”), for approval. An IRB may also require the clinical trial at the site to be halted, either temporarily or permanently, for failure to comply with the 
IRB’s requirements, or may impose other conditions. 

Clinical trials to support NDAs for marketing approval are typically conducted in three sequential phases, but the phases may overlap. In Phase 1, 

the initial introduction of the drug into healthy human subjects or patients, the drug is tested to assess metabolism, pharmacokinetics, pharmacological 
actions, side effects associated with increasing doses, and, if possible, early evidence of effectiveness. Phase 2 usually involves trials in a limited patient 
population to determine the effectiveness of the drug generally for a specific indication, dosage tolerance and optimum dosage, and to identify common 
adverse effects and safety risks. If a compound demonstrates evidence of effectiveness and an acceptable safety profile in Phase 2 evaluations, Phase 3 
trials are undertaken to obtain the additional information about clinical efficacy and safety in a larger number of patients, typically at geographically 
dispersed clinical trial sites, to permit FDA to evaluate the overall benefit-risk relationship of the drug and to provide adequate information for the labeling 
of the drug. In most cases FDA requires two adequate and well-controlled Phase 3 clinical trials to demonstrate the efficacy of the drug. A single Phase 3 
trial with other confirmatory evidence may be sufficient in rare instances, including (1) where the study is a large multicenter trial demonstrating internal 
consistency and a statistically very persuasive finding of a clinically meaningful effect on mortality, irreversible morbidity or prevention of a disease with a 
potentially serious outcome and confirmation of the result in a second trial would be practically or ethically impossible or (2) when in conjunction with 
other confirmatory evidence. 

After completion of the required clinical testing, an NDA is prepared and submitted to FDA. FDA approval of the NDA is required before 
marketing of the product may begin in the U.S. The NDA must include the results of all preclinical, clinical and other testing and a compilation of data 
relating to the product’s pharmacology, chemistry, manufacture and controls. The cost of preparing and submitting an NDA is substantial. The submission 
of most NDAs is additionally subject to a substantial application user fee, currently $4,048,695 for fiscal year 2024, and the applicant under an approved 
NDA is also subject to an annual program fee, currently $416,429 for each prescription drug product. These fees are typically increased annually. Sponsors 
of applications for drugs granted Orphan Drug Designation are exempt from these user fees. 

FDA has 60 days from its receipt of an NDA to determine whether the application will be accepted for filing based on the agency’s threshold 
determination that it is sufficiently complete to permit substantive review. FDA may request additional information rather than file an NDA. In this event, 
the NDA must be resubmitted with the additional information. The resubmitted application also is subject to review before FDA files it. Once the 
submission is accepted for filing, FDA begins an in-depth review. FDA has agreed to certain performance goals in the review of new drug applications to 
encourage timeliness. Most applications for standard review drug products are reviewed within ten to twelve months of the date of submission of the new 
drug application to FDA; the target review period for priority review drugs is six months from the date of filing (accepted for review by the FDA) of the 
new drug application. Priority review can be applied to an application for a drug that treats a serious condition and if approved would provide a significant 
improvement in safety or effectiveness over existing treatments or provide a treatment where no adequate therapy exists. The review process for both 
standard and priority review may be extended by FDA for three additional months to consider certain late-submitted information, or information intended 
to clarify information already provided in the submission. 

FDA may also refer applications for novel drug products, or drug products that present difficult questions of safety or efficacy, to an external drug 

advisory committee—typically a panel that includes clinicians, statisticians, patient representatives and other experts—for review, evaluation and a 
recommendation as to whether the application should be 

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approved. FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. 

Before approving an NDA, FDA will typically inspect one or more clinical sites to assure compliance with GCP. Additionally, FDA will inspect the 
facility or the facilities at which the drug substance and drug product are manufactured. FDA will not approve the product unless compliance with current 
good manufacturing practices (“cGMPs”) is satisfactory and the NDA contains data that provide substantial evidence that the drug is safe and effective in 
the indication studied. 

After FDA evaluates the NDA and the manufacturing facilities, it issues either an approval letter or a complete response letter. A complete response 
letter generally outlines the deficiencies in the submission and may require substantial additional testing, or information, in order for FDA to reconsider the 
application. Even after an applicant submits additional information, FDA ultimately may decide that the application does not satisfy the regulatory criteria 
for approval. If, or when, those deficiencies have been addressed to FDA’s satisfaction in a resubmission of the NDA, FDA will issue an approval letter. 
FDA has committed to reviewing such resubmissions in two or six months depending on the type of information included. 

An approval letter authorizes commercial marketing of the drug with specific prescribing information for specific indications. As a condition of 
NDA approval, FDA may require a risk evaluation and mitigation strategy (“REMS”) to help ensure that the benefits of the drug outweigh the potential 
risks. REMS can include medication guides, communication plans for healthcare professionals, and elements to assure safe use (“ETASU”). ETASU can 
include, but are not limited to, special training or certification for prescribing or dispensing, dispensing only under certain circumstances, special 
monitoring and the use of patient registries. The requirement for a REMS can materially affect the potential market and profitability of the drug. FDA may 
also require a REMS for a drug that is already on the market if it determines, based on new safety information, that a REMS plan is necessary to ensure that 
the products benefits outweigh its risks.

Changes to some of the conditions established in an approved application, including changes in indications, labeling, or manufacturing processes or 
facilities, require submission and FDA approval of a new NDA or NDA supplement before the change can be implemented. An NDA supplement for a new 
indication typically requires clinical data similar to that in the original application, and FDA uses the same procedures and actions in reviewing NDA 
supplements as it does in reviewing NDAs. 

Fast Track Designation, Breakthrough Designation, Accelerated Approval, and Priority Review 

The following four FDA programs are intended to facilitate and expedite development and review of new drugs to address unmet medical need in 

the treatment of a serious or life-threatening condition: fast track designation, breakthrough therapy designation, accelerated approval, and priority review. 

Under the Fast Track program, the sponsor of a new drug candidate may request that FDA designate the drug candidate for a specific indication as a 

Fast Track drug concurrent with, or after, the filing of the IND for the drug candidate. FDA must determine if the drug candidate qualifies for Fast Track 
Designation within 60 days of receipt of the sponsor’s request. Fast Track Designation is intended to facilitate development and expedite review of drugs to 
treat serious and life-threatening conditions so that an approved product can reach the market expeditiously. If a submission is granted Fast Track 
Designation, the sponsor may engage in more frequent interactions with FDA, and FDA may review sections of the NDA before the full application is 
complete. This rolling review is available if, in agreement with the FDA, the applicant provides, a schedule for the submission of the remaining 
information. However, the FDA does not start the review clock for the application until the last section of the NDA is submitted. Fast Track Designation 
may be withdrawn by FDA if they believe that the designation is no longer supported by data emerging data in the development process. 

Breakthrough Therapy Designation may be granted by the FDA to the development of a new drug and also for a new use or indication of an 

approved drug. This designation requires preliminary clinical evidence of a treatment effect that may represent substantial improvement over available 
therapies for the treatment of a serious condition. FDA expects that such evidence generally would be derived from early phase trials such as phase 1 or 2 
trials. For purposes of Breakthrough Therapy Designation, preliminary clinical evidence refers to evidence that is sufficient to indicate that the drug may 
demonstrate substantial improvement in effectiveness or safety over available therapies. A Breakthrough Therapy Designation conveys more intensive 
FDA guidance on an efficient drug development program. FDA also has an organizational commitment to involve senior management in such guidance. 
Such guidance may include holding meetings with the sponsor and review team throughout the development of the drug, providing timely advice to, and 
interactive communication with, the sponsor regarding the development of the drug to ensure that the development program to gather the non-clinical and 
clinical data necessary for approval is as efficient as possible, and taking steps to ensure that the design of the clinical trials is as efficient as practicable, 
when scientifically appropriate, such as by minimizing the number of patients exposed to a potentially less efficacious treatment.

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The FDA’s accelerated approval pathway is available under FDA’s accelerated approval regulations and under the FDCA for drugs that have been 
granted Fast Track designation. FDA may approve a drug for a serious or life-threatening illness that provides meaningful therapeutic benefit to patients 
over existing treatments based upon a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured 
earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, 
taking into account the severity, rarity, or prevalence of the condition and the availability or lack of alternative treatments. 

In clinical trials, a surrogate endpoint is a measurement of laboratory or clinical signs of a disease or condition that substitutes for a direct 

measurement of how a patient feels, functions, or survives. Surrogate endpoints can often be measured more easily or more rapidly than clinical endpoints. 
A drug candidate approved on this basis is subject to rigorous and mandatory post-marketing compliance requirements, including the completion of Phase 
4 or post-approval clinical trials to confirm the effect on the clinical endpoint. Failure to conduct required post-approval studies, or confirm a clinical 
benefit during post-marketing studies, will allow FDA to withdraw the drug from the market on an expedited basis. All promotional materials for drug 
candidates approved under accelerated regulations are subject to priority review by FDA. The Food and Drug Omnibus Reform Act (“FDORA”) was 
recently enacted, which included provisions related to the accelerated approval pathway. Pursuant to FDORA, the FDA is authorized to require a post-
approval study to be underway prior to approval or within a specified time period following approval. FDORA also requires the FDA to specify conditions 
of any required post-approval study, which may include milestones such as a target date of study completion and requires sponsors to submit progress 
reports for required post-approval studies and any conditions required by the FDA not later than 180 days following approval and not less frequently than 
every 180 days thereafter until completion or termination of the study. FDORA enables the FDA to initiate enforcement action for the failure to conduct 
with due diligence a required post-approval study, including a failure to meet any required conditions specified by the FDA or to submit timely reports.

A drug candidate is eligible for priority review, or review within a six-month time frame from the time an NDA is filed by FDA, if the drug 
candidate is intended for the treatment, diagnosis or prevention of a serious or life-threatening condition, demonstrates the potential to address an unmet 
medical need, or provides a significant improvement compared to marketed drugs.

Orphan Drugs 

Under the Orphan Drug Act, FDA may grant Orphan Drug Designation to drugs intended to treat a rare disease or condition—generally a disease or 
condition that affects fewer than 200,000 individuals in the U.S. Orphan Drug designation must be requested before submitting an NDA. After FDA grants 
Orphan Drug Designation, the generic identity of the drug and its potential orphan use are disclosed publicly by FDA. Orphan Drug Designation does not 
convey any advantage in, or shorten the duration of, the regulatory review and approval process. The first NDA applicant to receive FDA approval for a 
particular active ingredient to treat a particular disease with FDA Orphan Drug Designation is entitled to a seven-year exclusive marketing period in the 
U.S. for that product, for that indication. During the seven-year exclusivity period, FDA may not approve any other applications to market the same drug 
for the same disease, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity. Orphan drug 
exclusivity does not prevent FDA from approving a different drug for the same disease or condition, or the same drug for a different disease or condition. 
Among the other benefits of Orphan Drug Designation are tax credits for certain research and an exemption from the NDA user fee. 

Rare Pediatric Disease Priority Review Voucher program 

Under the Rare Pediatric Disease Priority Review Voucher program, FDA may award a priority review voucher to the sponsor of an approved 

marketing application for a product that treats or prevents a rare pediatric disease. The voucher entitles the sponsor to priority review of one subsequent 
marketing application. 

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A voucher may be awarded only for an approved rare pediatric disease product application. A rare pediatric disease product application is an NDA 

or a Biologics License Application (“BLA”) for a product that treats or prevents a serious or life-threatening disease in which the serious or life-threatening 
manifestations primarily affect individuals aged from birth to 18 years; in general, the disease must affect fewer than 200,000 such individuals in the U.S.; 
the NDA must be deemed eligible for priority review; the NDA must not seek approval for a different adult indication (i.e., for a different 
disease/condition); the product must not contain an active ingredient that has been previously approved by FDA; and the NDA must rely on clinical data 
derived from studies examining a pediatric population such that the approved product can be adequately labeled for the pediatric population. Before NDA 
approval, FDA may designate a product in development as a product for a rare pediatric disease, but such designation is not required to receive a voucher. 

To receive a rare pediatric disease priority review voucher, a sponsor must notify FDA, upon submission of the NDA, of its intent to request a 

voucher. If FDA determines that the NDA is a rare pediatric disease product application, and if the NDA is approved, FDA will award the sponsor of the 
NDA a voucher upon approval of the NDA. FDA may revoke a rare pediatric disease priority review voucher if the product for which it was awarded is not 
marketed in the U.S. within 365 days of the product’s approval. 

The voucher, which is transferable to another sponsor, may be submitted with a subsequent NDA or biologics license application, or BLA, and 

entitles the holder to priority review of the accompanying NDA or BLA. The sponsor submitting the priority review voucher must notify FDA of is intent 
to submit the voucher with the NDA or BLA at least 90 days prior to submission of the NDA or BLA and must pay a priority review user fee in addition to 
any other required user fee. FDA must take action on an NDA or BLA under priority review within six months of filing the NDA or BLA by FDA. 

On December 27, 2020, the Rare Pediatric Disease Priority Review Voucher Program was extended. Under the current statutory sunset provisions, 

after September 30, 2024, FDA may only award a voucher for an approved rare pediatric disease product application if the sponsor has rare pediatric 
disease designation for the drug, and that designation was granted by September 30, 2024. Without further statutory amendments, after September 30, 
2026, the FDA may not award any rare pediatric disease priority review vouchers. 

Post-approval requirements 

Once an NDA is approved, a product will be subject to certain post-approval requirements. For instance, FDA closely regulates the post-approval 

marketing and promotion of drugs, including standards and regulations for direct-to-consumer advertising, off-label promotion, industry-sponsored 
scientific and educational activities and promotional activities involving the internet. Drugs may be marketed only for the approved indications and in 
accordance with the provisions of the approved labeling. 

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

Pediatric information 

Under the Pediatric Research Equity Act (the “PREA”), NDAs or supplements to NDAs must contain data to assess the safety and effectiveness of 
the drug for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for 
which the drug is safe and effective. FDA may grant full or partial waivers, or deferrals, for submission of data. With certain exceptions, the PREA does 
not apply to any drug for an indication for which orphan designation has been granted. 

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The Best Pharmaceuticals for Children Act (the “BPCA”) provides NDA holders a six-month extension of any exclusivity—patent or nonpatent—

for a drug if certain conditions are met. Conditions for exclusivity include FDA’s determination that information relating to the use of a new drug in the 
pediatric population may produce health benefits in that population, FDA making a written request for pediatric studies, and the applicant agreeing to 
perform, and reporting on, the requested studies within the statutory timeframe. Applications under the BPCA are treated as priority applications, with all 
of the benefits that designation confers. 

Disclosure of clinical trial information 

Sponsors of clinical trials of FDA regulated products, including drugs, are required to register and disclose certain clinical trial information. 

Information related to the product, patient population, phase of investigation, study sites and investigators, and other aspects of the clinical trial is then 
made public as part of the registration. Sponsors are also obligated to discuss the results of their clinical trials after completion. Disclosure of the results of 
these trials can be delayed in certain circumstances for up to two years after the date of completion of the trial. Competitors may use this publicly available 
information to gain knowledge regarding the progress of development programs. The government recently released a regulation and policy to expand and 
enhance the requirements related to registering and reporting the results of clinical trials, which may result in greater enforcement of these requirements in 
the future.

The Hatch-Waxman Act 

Orange Book listing 

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

The ANDA applicant is required to certify to the FDA concerning any patents listed for the approved product in the FDA’s Orange Book. 

Specifically, the applicant must certify that (i) the required patent information has not been filed; (ii) the listed patent has expired; (iii) the listed patent has 
not expired but will expire on a particular date and approval is sought after patent expiration; or (iv) the listed patent is invalid or will not be infringed by 
the new product. The ANDA applicant may also elect to submit a section viii statement certifying that its proposed ANDA label does not contain (or carve 
out) any language regarding the patented method-of-use rather than certify to a listed method-of-use patent. If the applicant does not challenge the listed 
patents, the ANDA application will not be approved until all the listed patents claiming the referenced product have expired. A certification that the new 
product will not infringe the already approved product’s listed patents, or that such patents are invalid, is called a Paragraph IV certification. If the ANDA 
applicant has provided a Paragraph IV certification to the FDA, the applicant must also send notice of the Paragraph IV certification to the NDA and patent 
holders once the ANDA has been accepted for filing by the FDA. The NDA and patent holders may then initiate a patent infringement lawsuit in response 
to the notice of the Paragraph IV certification. The filing of a patent infringement lawsuit within 45 days of the receipt of a Paragraph IV certification 
automatically prevents the FDA from approving the ANDA until the earlier of 30 months, expiration of the patent, settlement of the lawsuit, or a decision 
in the infringement case that is favorable to the ANDA applicant. 

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

has expired. 

Exclusivity 

Upon NDA approval of a new chemical entity (“NCE”), which is a drug that contains no active moiety that has been approved by FDA in any other 

NDA, that drug receives five years of marketing exclusivity during which FDA cannot receive any ANDA seeking approval of a generic version of that 
drug. An ANDA may be submitted one year before NCE exclusivity expires if a Paragraph IV certification is filed. If there is no listed patent in the Orange 
Book, there may not be a Paragraph IV certification, and, thus, no ANDA may be filed before the expiration of the exclusivity period. Certain changes to a 
drug, such as the addition of a new indication to the package insert, can be the subject of a three-year period if the application 

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contains reports of new clinical investigations (other than bioavailability studies) conducted or sponsored by the sponsor that were essential to the approval 
of the application. FDA cannot approve an ANDA for a generic drug that includes the change during the exclusivity period.

Patent term extension 

After NDA approval, owners of relevant drug patents may apply for up to a five-year patent extension. The allowable patent term extension is 
calculated as half of the drug’s testing phase (the time between IND application and NDA submission) and all of the review phase (the time between NDA 
submission and approval up to a maximum of five years). The time can be shortened if FDA determines that the applicant did not pursue approval with due 
diligence. The total patent term after the extension may not exceed 14 years from the date of product approval. Only one patent applicable to an approved 
drug is eligible for extension and only those claims covering the approved drug, a method for using it, or a method for manufacturing it may be extended 
and the application for the extension must be submitted prior to the expiration of the patent. For patents that might expire during the application phase, the 
patent owner may request an interim patent extension. An interim patent extension increases the patent term by one year and may be renewed up to four 
times. For each interim patent extension granted, the post-approval patent extension is reduced by one year. The director of the United States Patent and 
Trademark Office must determine that approval of the drug covered by the patent for which a patent extension is being sought is likely. Interim patent 
extensions are not available for a drug for which an NDA has not been submitted. 

Other healthcare laws 

In addition to FDA restrictions on marketing of pharmaceutical products, several other types of state and federal laws have been applied to restrict 

certain general business and marketing practices in the pharmaceutical industry in recent years. These laws include anti-kickback statutes, false claims 
statutes and other healthcare laws and regulations. 

The federal Anti-Kickback Statute prohibits, among other things, knowingly and willfully offering, paying, soliciting or receiving remuneration to 

induce, or in return for, purchasing, leasing, ordering or arranging for the purchase, lease or order of any healthcare item or service reimbursable under 
Medicare, Medicaid, or other federally financed healthcare programs. The Patient Protection and Affordable Care Act as amended by the Health Care and 
Education Reconciliation Act, collectively, the ACA, amended the intent element of the federal statute so that a person or entity no longer needs to have 
actual knowledge of the statute or specific intent to violate it in order to commit a violation. 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. Although there are a number of 
statutory exceptions and regulatory safe harbors protecting certain common activities from prosecution or other regulatory sanctions, the exceptions and 
safe harbors are drawn narrowly, and practices that involve remuneration intended to induce prescribing, purchases or recommendations may be subject to 
scrutiny if they do not qualify for an exception or safe harbor. 

Federal civil and criminal false claims laws, including the federal civil False Claims Act, prohibit any person or entity from knowingly presenting, 
or causing to be presented, a false claim for payment to the federal government, or knowingly making, or causing to be made, a false statement to have a 
false claim paid. This includes claims made to programs where the federal government reimburses, such as Medicaid, as well as programs where the federal 
government is a direct purchaser, such as when it purchases off the Federal Supply Schedule. Recently, several pharmaceutical and other healthcare 
companies have been prosecuted under these laws for allegedly inflating drug prices they report to pricing services, which in turn were used by the 
government to set Medicare and Medicaid reimbursement rates, and for allegedly providing free product to customers with the expectation that the 
customers would bill federal programs for the product. In addition, certain marketing practices, including off-label promotion, may also violate false claims 
laws. Additionally, the ACA amended the federal Anti-Kickback Statute such that a violation of that statute can serve as a basis for liability under the 
federal False Claims Act. Most states also have statutes or regulations similar to the federal Anti-Kickback Statute and False Claims Act, which apply to 
items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor. 

Other federal statutes pertaining to healthcare fraud and abuse include the civil monetary penalties statute, which prohibits, among other things, the 

offer or payment of remuneration to a Medicaid or Medicare beneficiary that the offeror or payor knows or should know is likely to influence the 
beneficiary to order a receive a reimbursable item or service from a particular supplier, and the additional federal criminal statutes created by the Health 
Insurance Portability and Accountability Act of 1996 (“HIPAA”), which prohibits, among other things, knowingly and willfully executing or attempting to 
execute a scheme to defraud any healthcare benefit program or obtain by means of false or fraudulent pretenses, representations or promises any money or 
property owned by or under the control of any healthcare benefit program in connection with the delivery of or payment for healthcare benefits, items or 
services. 

In addition, HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009 (“HITECH”), and their 
respective implementing regulations, including the Final Omnibus Rule published on January 25, 2013, impose obligations on certain healthcare providers, 
health plans, and healthcare clearinghouses, known as covered 

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entities, as well as their business associates that perform certain services involving the storage, use or disclosure of individually identifiable health 
information, including mandatory contractual terms, with respect to safeguarding the privacy, security, and transmission of individually identifiable health 
information, and require notification to affected individuals and regulatory authorities of certain breaches of security of individually identifiable health 
information. HITECH increased the civil and criminal penalties that may be imposed against covered entities, business associates and possibly other 
persons, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws 
and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition, many state laws govern 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, and often are not pre-
empted by HIPAA. For example, the California Consumer Privacy Act of 2018 (“CCPA”), imposes obligations on businesses to which it applies, including, 
but not limited to, providing specific disclosures in privacy notices and affording California residents certain rights related to their personal data, although it 
exempts some data processed in the context of clinical trials. In addition, the California Privacy Rights Act of 2020 (“CPRA”), which went into effect on 
January 1, 2023, imposes additional obligations on companies covered by the legislation and significantly modifies the CCPA, including by expanding 
consumers’ rights with respect to certain sensitive personal information. The CPRA also creates a new state agency that is vested with authority to 
implement and enforce the CCPA and CPRA. Virginia’s Consumer Data Protection Act, which took effect on January 1, 2023, requires businesses subject 
to the legislation to conduct data protection assessments in certain circumstances and requires opt-in consent from consumers to acquire and process their 
sensitive personal information, which includes information revealing a consumer’s physical and mental health diagnosis and genetic and biometric 
information that can identify a consumer. In addition, Colorado enacted the Colorado Privacy Act, and Connecticut enacted the Connecticut Data Privacy 
Act, each of which took effect on July 1, 2023, and Utah enacted the Consumer Privacy Act, which became effective on December 31, 2023, and each of 
these laws may increase the complexity, variation in requirements, restrictions and potential legal risks, and could require increased compliance costs and 
changes in business practices and policies. Other states have also enacted, proposed, or are considering proposing, data privacy laws, which could further 
complicate compliance efforts, increase our potential liability and adversely affect our business. 

Further, pursuant to the federal Physician Payments Sunshine Act, enacted as part of the ACA, the Centers for Medicare & Medicaid Services (the 

“CMS”) has issued a final rule that requires manufacturers of approved prescription drugs that are reimbursable under Medicare, Medicaid, or the 
Children’s Health Insurance Program, with certain exceptions, to collect and report annually information on certain payments or transfers of value to 
physicians, physician assistants, certain types of advance practice nurses and teaching hospitals, or to entities or individuals at the request of, or designated 
on behalf of, such providers, and to report annually certain ownership and investment interests held by physicians and their immediate family members. 
The reported data is made available in searchable form on a public website on an annual basis. Failure to submit required information may result in civil 
monetary penalties. 

In addition, several states now require prescription drug companies to report certain expenses relating to the marketing and promotion of drug 

products and to report gifts and payments to individual healthcare practitioners in these states. Other states prohibit various marketing-related activities, 
such as the provision of certain kinds of gifts or meals. Still other states require the posting of information relating to clinical studies and their outcomes. A 
growing number of states require the reporting of certain pricing information, including information pertaining to and justifying price increases and the 
prices of newly launched drugs, or prohibit prescription drug price gouging. In addition, certain states require pharmaceutical companies to implement 
compliance programs and/or marketing codes. Certain states and local jurisdictions also require the registration of pharmaceutical sales representatives. 
Compliance with these laws is difficult and time consuming, and companies that do not comply with these state laws face civil penalties. 

Efforts to ensure that business arrangements with third parties comply with applicable healthcare laws and regulations involve substantial costs. If a 

drug company’s operations are found to be in violation of any such requirements, it may be subject to significant penalties, including civil, criminal and 
administrative penalties, damages, fines, disgorgement, imprisonment, the curtailment or restructuring of its operations, loss of eligibility to obtain 
approvals from the FDA, exclusion from participation in government contracting, healthcare reimbursement or other federal or state government healthcare 
programs, including Medicare and Medicaid, integrity oversight and reporting obligations, imprisonment, and reputational harm. Although effective 
compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, these risks cannot be entirely eliminated. Any 
action for an alleged or suspected violation can cause a drug company to incur significant legal expenses and divert management’s attention from the 
operation of the business, even if such action is successfully defended. 

Possible change in law or policy

Healthcare reforms that have been adopted, and that may be adopted in the future, could result in further reductions in coverage and levels of 

reimbursement for pharmaceutical products, increases in rebates payable under U.S. government 

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rebate programs and additional downward pressure on pharmaceutical product prices. Several healthcare reform proposals recently culminated in the 
enactment of the Inflation Reduction Act (the “IRA”), which, among other things, allows the U.S. Department of Health and Human Services (“HHS”) to 
directly negotiate the selling price of a statutorily specified number of drugs and biologics each year that CMS reimburses under Medicare Part B and Part 
D. Only high-expenditure single-source drugs that have been approved for at least 7 years (11 years for single-source biologics) are eligible to be selected 
by CMS for negotiation, with the negotiated price taking effect two years after the selection year. Negotiations for Medicare Part D products take place in 
2024 with the negotiated price taking effect in 2026, and negotiations for Medicare Part B products will begin in 2026 with the negotiated price taking 
effect in 2028. In August 2023, HHS announced the ten Medicare Part D drugs and biologics that it selected for negotiations. HHS will announce the 
negotiated maximum fair prices by September 1, 2024, and this price cap, which cannot exceed a statutory ceiling price, will go into effect on January 1, 
2026. A drug or biological product that has an orphan drug designation for only one rare disease or condition will be excluded from the IRA’s price 
negotiation requirements, but will lose that exclusion if it receives designations for more than one rare disease or condition, or if is approved for an 
indication that is not within that single designated rare disease or condition, unless such additional designation or such disqualifying approvals are 
withdrawn by the time CMS evaluates the drug for selection for negotiation. The IRA also imposes rebates on Medicare Part D and Part B drugs whose 
prices have increased at a rate greater than the rate of inflation. In addition, the IRA will eliminate, beginning in 2025, the coverage gap under Medicare 
Part D by significantly lowering the enrollee maximum out-of-pocket cost and requiring manufacturers to subsidize, through a newly established 
manufacturer discount program, 10% of Part D enrollees’ prescription costs for brand drugs below the out-of-pocket maximum, and 20% once the out-of-
pocket maximum has been reached. The IRA also extends enhanced subsidies for individuals purchasing health insurance coverage in ACA marketplaces 
through plan year 2025. The IRA permits the Secretary of HHS to implement many of these provisions through guidance, as opposed to regulation, for the 
initial years. Manufacturers that fail to comply with the IRA may be subject to various penalties, including significant civil monetary penalties.  These 
provisions have been and may continue to be subject to legal challenges. For example, the provisions related to the negotiation of selling prices of high-
expenditure single-source drugs and biologics have been challenged in multiple lawsuits brought by pharmaceutical manufacturers. Thus, while it is 
unclear how the IRA will be implemented, it will likely have a significant impact on the biopharmaceutical industry and the pricing of prescription drug 
products. It is unclear to what extent other statutory, regulatory, and administrative initiatives will be enacted and implemented. 

Foreign regulation 

Clinical trials

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

and distribution of our product candidates to the extent we choose to sell any products outside of the United States. For clinical trials, many countries 
outside of the United States have a similar process that requires the submission of a clinical study application similar to the process in the United States. 
However, the specific requirements governing the conduct of clinical trials vary greatly from country to country. In the European Union, for example, 
clinical trials are governed by the new EU Regulation on Clinical Trials (Reg. EU No. 536/2014) (the “CTR”) that has become applicable on January 31, 
2022. The CTR stipulates the process of obtaining competent authority approval for clinical trials. Under the CTR, trial sponsors submit their application 
for approval via an EU Portal. While the procedure for approval is conducted in a coordinated manner among the concerned EU Member States as provided 
under the CTR, the approvals will still have to be granted by the competent authorities of the EU Member States where a trial takes place. The CTR has 
streamlined the process for the application and granting of the approvals in comparison with the predecessor legislation, Directive 2001/20/EC on clinical 
trials (the “CTD”). However, the process of obtaining clinical trial approval in the EU is still complex and can significantly delay the start of a 
multinational clinical trial.

Following the United Kingdom’s exit from the European Union on December 31, 2020, different rules apply in the United Kingdom from the 

European Union. In the United Kingdom, clinical trials are governed by the Medicines for Human Use (Clinical Trials) Regulations 2004. These 
regulations are based on the predecessor EU regulations to the CTR. The CTR have not been adopted in the United Kingdom. Under the U.K. regulations, 
an approval is required from the MHRA together with a positive ethics committee opinion. Clinical trials which take place in the U.K. and on NHS hospital 
sites, typically do so on the basis of standardized documentation which set out indemnification provisions. In the UK, there are proposals to replace the 
current U.K. regulations with revised legislation, which will include changes with respect to transparency, approval pathways and regulatory requirements.

Approval and reimbursement

Whether or not we obtain FDA approval for a product, we must obtain approval or licensing of a product by regulatory authorities of foreign 

countries before we can commence marketing of the product in those countries. The approval processes 

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for both approval and marketing of commercial drugs vary from country to country and the time may be longer or shorter than that required for FDA 
approval. 

The requirements governing the product licensing, pricing and reimbursement vary greatly from country to country. As in the United States, post-
approval regulatory requirements, such as those regarding product manufacture, marketing, or distribution would apply to any product that is approved 
outside the United States. 

To obtain regulatory approval of a medicinal product under EU regulatory systems, a sponsor must submit a marketing authorization application. 

The grant of marketing authorization in the EU is governed by Directive 2001/83/EC of the European Parliament and of the Council, commonly known as 
the Community Code 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. In addition, Regulation 1394/2007/EC on advanced therapy medicinal products (“ATMP”) 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 ATMP. The role of CAT is to prepare a draft opinion on an application for marketing authorization for an ATMP candidate. 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. 

EU legislation provides for a system of regulatory data and market exclusivity. According to Article 14(11) of the EMA Regulation, and Article 

10(1) of the Community Code, upon receiving marketing authorization, new chemical entities approved on the basis of complete independent data package 
benefit from eight years of data exclusivity and an additional two years of market exclusivity. Data exclusivity prevents regulatory authorities in the 
European Union from referencing the innovator’s data to assess a generic (abbreviated) application. During the additional two-year period of market 
exclusivity, a generic marketing authorization can be submitted, and the innovator’s data may be referenced, but no generic medicinal product can be 
marketed until the expiration of the market exclusivity. The overall ten-year period will be extended to a maximum of eleven years if, during the first eight 
years of those ten years, the marketing authorization holder, or MAH, 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. Even if a 
compound is considered to be a new chemical entity and the innovator is able to gain the period of data exclusivity, another company nevertheless could 
also market another version of the drug if such company obtained marketing authorization based on an application with a complete independent data 
package of pharmaceutical tests, preclinical tests and clinical trials. Depending upon the timing and duration of the EU marketing authorization process, 
products may be eligible for up to five years’ supplementary protection certificates, or SPC, pursuant to Regulation (EC) No 469/2009. Such SPC extend 
the rights under the basic patent for the drug.

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, 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 

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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:

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•

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”).

In April 2023, the European Commission adopted a proposal for a new Directive and a new Regulation, which revise and replace the existing 
general pharmaceutical legislation. The proposed changes include the proposal to recast Directive 2001/83/EC, i.e., the Community Code and the creation 
of a new Regulation laying down EU marketing authorization of medicinal products that will replace Regulation (EC) No 726/2004, Regulation (EC) No 
141/2000 on orphan drugs and Regulation (EC) No 1901/2006 on pediatric medicines, and amend Regulation (EC) No 1394/2007 on ATMP and 
Regulation 536/2014, i.e., the CTR. The proposals include significant changes, in particular with regard to the document protection and market exclusivity 
periods for medicinal products. In October 2023, the European Parliament proposed revisions to the European Commission proposals with diverging views 
on various topics. Further changes may be expected while the legislative process continues.

Reimbursement for medicinal products is still an area that is not harmonized in the EU, but 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 based on 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.

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 EU Regulation on HTA was adopted on December 13, 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 (“HTA Regulation”). It will become applicable on January 12, 
2025. The HTA Regulation covers new medicines and certain new medical devices, “providing the basis for permanent and sustainable cooperation at the 
EU level for joint clinical 

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assessments in these areas.” 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.

In the United Kingdom and following the United Kingdom’s exit from the European Union, EU medicines regulation has been adopted as 
standalone United Kingdom legislation with some amendments to reflect procedural and other requirements with respect to marketing authorizations and 
other regulatory provisions.

In order to market a medicinal product in the United Kingdom, a license or marketing authorization must be obtained from the United Kingdom 

Medicines and Healthcare Products Regulatory Agency (the “MHRA”). The United Kingdom legislation includes multiple assessment routes for 
applications for medicinal products, including a 150-day national assessment or a rolling review application. Further, and until December 31, 2023, the 
MHRA could rely on a decision taken by the European Commission on the approval of a new marketing authorization in the centralized procedure 
(“ECDRP”) and had the power to have regard to marketing authorizations approved in EU member states (“MRDCRP”). After January 1, 2024, both of 
those recognition procedures (the ECDRP and the MRDCRP) have been replaced by a new international recognition framework.

The MHRA reviews applications for orphan designation at the time of a marketing authorization application or as part of a subsequent variation to 

that authorization. To qualify for orphan designation, a medicine must meet certain criteria in the United Kingdom including that the medicine for the 
treatment, prevention or diagnosis of a disease that is life-threatening or chronically debilitating, the prevalence of the condition must not be more than 5 in 
10,000 or it must be unlikely that the marketing would generate sufficient returns to justify investment and no satisfactory method of diagnosis, prevention 
or treatment must exist in Great Britain or, if such a method exists the medicine must be of significant benefit to those affected by the condition. On grant 
of a marketing authorization with orphan status, the medicinal product will benefit from up to 10 years of market exclusivity from similar products in the 
approved orphan indication starting from the date of first approval of the product in Great Britain.

The United Kingdom has adopted new legislation, the Medicines and Medical Devices Act 2021 and may make changes to the licensing or 
authorization of medicines in the future. The separate U.K. authorization system, albeit with international recognition procedures in the UK, may lead to 
additional regulatory costs. In addition, even though at the moment the United Kingdom retains acceptance of batch testing and EU certification, further 
regulatory costs may be incurred with respect to the lack of mutual recognition of batch testing and related regulatory measures between the European 
Union and the United Kingdom.

Reimbursement in the United Kingdom for use by public payors (National Health Service) organizations may depend on a positive technology 

assessment by the National Institute for Health and Care Excellence (“NICE”). A positive recommendation by NICE would lead to an obligation to fund, 
subject to terms of that approval, by NHS organizations. In assessing any new medicinal product, NICE will take into account clinical as well as the 
economic value of the product.

Failure to obtain positive reimbursement recommendations or failure to obtain government and third-party payor reimbursement coverage in foreign 

countries may affect the marketability and commercial sales of any product candidates for which regulatory approval is received.

Employees and Human Capital Resources

As of December 31, 2023, we had 110 employees, 37 of whom have an M.D. or Ph.D. We have not experienced any work stoppages. None of our 

employees is represented by a labor union or covered by collective bargaining agreements, and we consider our relationship with our employees to be 
good.

We seek to attract, hire and retain individuals of diverse backgrounds and of all ages, genders, ethnicities, religions, home countries and sexual 
orientation. As of December 31, 2023, approximately 59% of our employees are female, and approximately 47% of our management team (which we 
define as at the vice president level and above) are female. More than 36% of our employees self-identify as racially or ethnically diverse as of December 
31, 2023. 

Our human capital resources objectives include, as applicable, identifying, recruiting, integrating, motivating, developing, and retaining our existing 

and additional employees. The principal purposes of our equity incentive and cash-based performance bonus plans are to attract, retain and motivate 
selected employees, consultants and directors through the granting of stock-based compensation awards.

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Available Information

Stoke Therapeutics, Inc. was founded in June 2014 and was incorporated under the laws of the State of Delaware. Our principal executive offices 

are located at 45 Wiggins Ave, Bedford, Massachusetts 01730, and our telephone number is (781) 430-8200. Our website address is 
www.stoketherapeutics.com. The information contained on, or that can be accessed through, our website is not part of, and is not incorporated by reference 
into, this Annual Report. 

We file annual, quarterly and current reports, proxy statements and other documents with the Securities and Exchange Commission, or SEC, under 
the Securities Exchange Act of 1934, as amended, or Exchange Act. The SEC maintains an Internet website that contains reports, proxy and information 
statements, and other information regarding issuers, including us, that file electronically with the SEC. The public can obtain any documents that we file 
with the SEC at www.sec.gov. Copies of each of our filings with the SEC can also be viewed and downloaded free of charge at our website, www. 
stoketherapeutics.com, after the reports and amendments are electronically filed with or furnished to the SEC.

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Item 1A. Risk Factors. 

Investing in our common stock involves a high degree of risk. Before making your decision to invest in shares of our common stock, you should 
carefully consider the risks described below, together with the other information contained in this annual report, including our consolidated financial 
statements and the related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations”. The risks and 
uncertainties described below are not the only ones we face. Additional risks and uncertainties that we are unaware of, or that we currently believe are not 
material, may also become important factors that affect us. We cannot assure you that any of the events discussed below will not occur. These events could 
have a material and adverse impact on our business, financial condition, results of operations and prospects. If that were to happen, the trading price of 
our common stock could decline, and you could lose all or part of your investment. 

Summary of Risk Factors

An investment in our common stock involves various risks, and prospective investors are urged to carefully consider the matters discussed in the 

section titled “Risk Factors” prior to making an investment in our common stock. These risks include, but are not limited to, the following:

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We are early in our development efforts. If we or our collaborators are unable to develop, obtain regulatory approval for and commercialize 
STK-001, STK-002 and our future product candidates, or if we experience significant delays in doing so, our business will be materially 
harmed.

Success in early preclinical studies or clinical trials may not be indicative of results obtained in later preclinical studies and clinical trials, 
including in our Dravet syndrome program or our ADOA program. 

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 and the approval may be for a narrower indication than we seek.

Certain of the diseases we seek to treat have low prevalence, and it may be difficult to identify patients with these diseases, which may lead 
to delays in enrollment for our trials or slower commercial revenue growth if STK-001, STK-002 or our future product candidates are 
approved.

If clinical trials of STK-001, STK-002 or any other product candidate that we develop fail to demonstrate safety and efficacy to the 
satisfaction of FDA or foreign regulatory authorities or do not otherwise produce favorable results, we may incur additional costs or 
experience delays in completing, or ultimately may be unable to complete, the development and commercialization of such product 
candidate.

We may not be successful in our efforts to use TANGO to expand our pipeline of product candidates and develop marketable products.

Any product candidate for which we obtain marketing approval will be subject to extensive post-marketing regulatory requirements and 
could be subject to post-marketing restrictions or withdrawal from the market, and we may be subject to penalties if we fail to comply with 
regulatory requirements or if we experience unanticipated problems with our product candidates, when and if any of them are approved.

Our failure to obtain regulatory approval in international jurisdictions would prevent us from marketing our product candidates outside the 
United States.

STK-001, STK-002 or our future product candidates may cause undesirable and unforeseen side effects or be perceived by the public as 
unsafe, which could delay or prevent their advancement into clinical trials or regulatory approval, limit the commercial potential or result in 
significant negative consequences. 

A Rare Pediatric Disease designation by the FDA does not guarantee that the new drug application (“NDA”) for the product will qualify for a 
priority review voucher upon approval, and it does not lead to a faster development or regulatory review process, or increase the likelihood 
that STK-001, STK-002 or our future product candidates will receive marketing approval.

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A Fast Track Designation by the FDA, even if granted for STK-001, STK-002 or our future product candidates, may not lead to a faster 
development or regulatory review or approval process, and would not increase the likelihood that our product candidates will receive 
marketing approval. 

A Breakthrough Therapy Designation by the FDA, even if granted for STK-001, STK-002 or our future product candidates may not lead to a 
faster development or regulatory review or approval process, and it would not increase the likelihood that the product candidates will receive 
marketing approval. 

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

The commercial success of our product candidates, including STK-001 and STK-002 will depend upon their degree of market acceptance by 
providers, patients, patient advocacy groups, third-party payors and the general medical community.

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

Current and potential future healthcare reforms may adversely impact pricing, insurance coverage and reimbursement status of newly 
approved products.

We have a history of operating losses, and we may not achieve or sustain profitability. We anticipate that we will continue to incur losses for 
the foreseeable future. If we fail to obtain additional funding to conduct our planned research and development effort, we could be forced to 
delay, reduce or eliminate our product development programs or commercial development efforts.

We expect that we will need to raise additional funding before we can expect to become profitable from any potential future sales of STK-
001, STK-002 or our future product candidates. This additional financing 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 our product development efforts or other operations.

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

Our success depends in part on our ability to obtain, maintain and protect our intellectual property. It is difficult and costly to protect our 
proprietary rights and technology, and we may not be able to ensure their protection. 

The market price of our stock may be volatile, and you could lose all or part of your investment.

Risks Related to Product Development and Regulatory Approval

We are early in our development efforts. If we are unable to develop, obtain regulatory approval for and commercialize STK-001, STK-002 and our 
future product candidates, or if we experience significant delays in doing so, our business will be materially harmed. 

We have invested substantially all of our efforts and financial resources in the development of our Targeted Augmentation of Nuclear Gene Output 

(“TANGO”) technology and our current lead product candidate, STK-001, for the treatment of Dravet syndrome. We submitted an investigational new drug 
application (“IND”) for STK-001 to the U.S. Food and Drug Administration (the “FDA”) in late 2019. In August 2020, we dosed the first patient with 
STK-001 in the single ascending dose portion of the MONARCH Phase 1/2a Study at the 10mg dose level. 

In addition, in November 2020, we announced the nomination of OPA1 as our next target for preclinical development to treat Autosomal Dominant 

Optic Atrophy (“ADOA”). In November 2021, we announced the nomination of STK-002 as the lead product candidate for the treatment of ADOA and 
intend to invest significant efforts and financial resources in its development. We submitted a Clinical Trial Authorization (“CTA”) application for STK-
002 to the United Kingdom Medicines and Healthcare Products Regulatory Agency (the “MHRA”) in early 2023, and the MHRA authorized such CTA in 
April 2023, but enrollment and dosing of patients has not yet commenced. Our ability to generate product revenue, which we do not expect will occur for 
many years, if ever, will depend heavily on the successful development and eventual commercialization of TANGO and our product candidates, which may 
never occur. We currently generate no revenue from sales of any product, and we may never be able to develop or commercialize a marketable product.

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Each of our programs and product candidates will require preclinical and clinical development, regulatory approval in multiple jurisdictions, 
obtaining preclinical, clinical and commercial manufacturing supply, capacity and expertise, building of a commercial organization, substantial investment 
and significant marketing efforts before we generate any revenue from product sales. STK-001, STK-002 and our future product candidates must be 
authorized for marketing by the FDA or certain other foreign regulatory agencies, such as the European Medicines Agency (the “EMA”) or the MHRA, 
before we may commercialize any of our product candidates.

The success of STK-001, STK-002 and our future product candidates depends on multiple factors, including: 

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effective INDs and CTAs that allow commencement of our planned clinical trials or future clinical trials for our product candidates in 
relevant territories; 

our ability to obtain approval from institutional review boards (“IRBs”) or ethics committees to conduct clinical trials at their respective sites;

potential delays in enrollment, site visits, evaluations, or dosing of patients participating in clinical trials as hospitals face staffing shortages, 
whether due to labor relations or otherwise, or patients decide not to enroll in the study as a result of such staffing shortages;

the direct and indirect impact of general economic, industry and market conditions, including fluctuating interest rates, inflation, market 
volatility, potential recessions, a potential federal government shutdown, and any health pandemic on our business and operations, third party 
vendors, supply chain, and regulatory approvals;

successful completion of preclinical studies, including those compliant with Good Laboratory Practices (“GLP”) toxicology studies, 
biodistribution studies and minimum effective dose studies in animals; 

our ability to reach agreements on acceptable terms with prospective third-party contract research organizations (“CROs”) and trial sites, the 
terms of which can be subject to extensive negotiation and may vary significantly among CROs and trial sites;

successful enrollment and completion of clinical trials compliant with current Good Clinical Practices (“GCPs”);

positive results from our clinical programs that demonstrate safety and efficacy and provide an acceptable risk-benefit profile for our product 
candidates in the intended patient populations;

receipt of regulatory approvals from applicable regulatory authorities; 

establishment of arrangements with third-party contract manufacturing organizations (“CMOs”) for key materials used in our manufacturing 
processes and to establish backup sources for clinical and large-scale commercial supply; 

establishment and maintenance of patent and trade secret protection and regulatory exclusivity for our product candidates; 

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

acceptance of our product candidates, if and when approved, by patients, patient advocacy groups, third-party payors and the general medical 
community; 

our effective competition against other therapies available in the market; 

establishment and maintenance of adequate reimbursement from third-party payors for our product candidates; 

our ability to acquire or in-license additional product candidates; 

prosecution, maintenance, enforcement and defense of intellectual property rights and claims; and 

maintenance of a continued acceptable safety profile of our product candidates following approval.

If we do not succeed in one or more of these factors in a timely manner or at all, we could experience significant delays or an inability to 
successfully commercialize our product candidates, which would materially harm our business. If we do not receive regulatory approvals for our product 
candidates, we may not be able to continue our operations. 

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Success in early preclinical studies or clinical trials may not be indicative of results obtained in later preclinical studies and clinical trials, including in 
our Dravet syndrome program or our ADOA program. 

STK-001 is currently being evaluated in human clinical trials, and we may experience unexpected or negative results in the future. We will be 
required to demonstrate through adequate and well-controlled clinical trials that our product candidates 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. The positive results we have observed for our 
product candidates in preclinical animal models may not be predictive of our future clinical trials in humans, as mouse models carry inherent limitations 
relevant to all preclinical studies. In particular, the Dravet syndrome mouse model is more severe than the human disease and provides a shorter post-
symptomatic observation period. Trial designs and results from early-phase trials are not necessarily predictive of future clinical trial designs or results, and 
initial positive results we may observe may not be confirmed in later-phase clinical trials. For example, although we recently reported end of study data 
from our Phase 1/2a open-label studies of STK-001 demonstrating a reduction in median convulsive seizure frequency compared to baseline, these results 
were based on pooling data from the Phase 1/2a open-label studies of STK-001 in the United States (MONARCH) and in the United Kingdom 
(ADMIRAL) and additional trials may not confirm these results. Our product candidates may also fail to show the desired safety and efficacy in later stages 
of clinical development even if they successfully advance through initial clinical trials, and preliminary interim data readouts of ongoing trials may show 
results that change when such trials are completed. We may not be able to demonstrate a disease-modifying effect of STK-001 in our clinical trials in 
Dravet syndrome patients, even if we are able to demonstrate efficacy on seizure reduction, and we may be similarly unable to demonstrate the efficacy of 
STK-002 in our ADOA program or other future programs. In addition, our clinical trials to date have necessarily involved relatively small numbers of 
participants. Therefore, conclusions we draw based upon trial results to date may not be repeatable across larger cohorts of participants or patients with 
different characteristics. Moreover, even if our clinical trials demonstrate acceptable safety and efficacy of STK-001, STK-002 or our future product 
candidates, the labeling we obtain through negotiations with the FDA or foreign regulatory authorities may not include data on secondary endpoints and 
may not provide us with a competitive advantage over other products approved for the same or similar indications. 

Many companies in the biotechnology industry have suffered significant setbacks in late-stage clinical trials after achieving positive results in early-

stage development and there is a high failure rate for product candidates proceeding through clinical trials. In addition, different methodologies, 
assumptions and applications we utilize to assess particular safety or efficacy parameters may yield different statistical results. Even if we believe the data 
collected from clinical trials of our product candidates are promising, these data may not be sufficient to support approval by the FDA or foreign regulatory 
authorities. Preclinical and clinical data can be interpreted in different ways. Accordingly, the FDA or foreign regulatory authorities could interpret these 
data in different ways from us or our partners, which could delay, limit or prevent regulatory approval. If our study data do not consistently or sufficiently 
demonstrate the safety or efficacy of any of our product candidates, including STK-001 for Dravet syndrome or STK-002 for ADOA, then the regulatory 
approvals for such product candidates could be significantly delayed as we work to meet approval requirements, or, if we are not able to meet these 
requirements, such approvals could be withheld or withdrawn. Regulatory delays or rejections may be encountered as a result of many factors, including 
changes in regulatory policy during the period of product development. We cannot be certain that we will not face similar setbacks. 

If clinical trials of STK-001, STK-002 or any other product candidate that we develop fail to demonstrate safety and efficacy to the satisfaction of FDA 
or foreign regulatory authorities or do not otherwise produce favorable results, we may incur additional costs or experience delays in completing, or 
ultimately may be unable to complete, the development and commercialization of such product candidate.

Before obtaining marketing approval from regulatory authorities for the sale of any product candidate, including STK-001 and STK-002, we must 

complete preclinical development and then conduct extensive clinical trials to demonstrate the safety and efficacy of our product candidates in humans. 
Clinical testing is expensive, difficult to design and implement, can take many years to complete and is uncertain as to outcome. A failure of one or more 
clinical trials can occur at any stage of testing.

Clinical trials may be placed on a full or partial clinical hold by the FDA, foreign regulatory authorities, or us for various reasons, including but not 

limited to: deficiencies in the conduct of the clinical trials, including failure to conduct the clinical trial in accordance with regulatory requirements or 
clinical protocols; deficiencies in the clinical trial operations or trial sites; deficiencies in the trial designs necessary to demonstrate efficacy; fatalities or 
other adverse effects arising during a clinical trial due to medical problems that may or may not be related to clinical trial treatments; the product 
candidates may not appear to be more effective than current therapies; the quality or stability of the product candidates may fall below acceptable 
standards; or the data from animal studies are not sufficient to support the anticipated exposure (dose, route of administration, and duration) for the 
proposed clinical trial. For example, in March 2020, we announced that the FDA had placed a partial clinical hold on doses of STK-001 above 20mg in the 
MONARCH study based on observations of adverse 

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hind limb paresis in non-human primates, pending additional preclinical testing. The partial clinical hold remains in place in the MONARCH study for 
single and multiple doses above 70mg, and in the SWALLOWTAIL open-label extension study for chronic doses above 45mg. Although we have now 
announced end of study data from the MONARCH study, if the partial clinical hold is not lifted, our ability to successfully conclude other studies related to 
STK-001, and our business, results of operations and financial condition, may be adversely affected. 

In addition, we, the FDA, foreign regulatory authorities, or an IRB or similar foreign review board or committee, may delay initiation of, suspend or 

limit dose escalation of clinical trials of a product candidate at any time for various reasons, including if we or they believe the healthy volunteer subjects 
or patients participating in such trials are being exposed to unacceptable health risks. Among other reasons, adverse side effects of a product candidate or a 
related product in preclinical trials or on healthy volunteer subjects or patients in a clinical trial could result in such a decision. For example, in November 
2022, we announced our decision to limit chronic dosing in the open-label extension studies to 30mg in SWALLOWTAIL in the U.S. and 45mg in 
LONGWING in the U.K. Our decision at that time was based on interactions with regulatory agencies and a review of interim chronic toxicology data from 
a study in NHPs in which the total drug administered to NHPs over a 1-year period was substantially higher than what we would anticipate giving to 
participants in clinical trials.

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 and the approval may be for a narrower indication than we seek. 

Prior to commercialization, STK-001, STK-002, and our other future product candidates must be approved by the FDA pursuant to an NDA in the 

United States and pursuant to similar marketing applications by the EMA and similar regulatory authorities outside the United States. The process of 
obtaining marketing approvals, both in the United States and abroad, is expensive and takes many years, if approval is obtained at all, and can vary 
substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. Failure to obtain marketing 
approval for a product candidate will prevent us from commercializing the product candidate. We have not received approval to market STK-001, STK-002 
or any of our other future product candidates from regulatory authorities in any jurisdiction. We have no experience in submitting and supporting the 
applications necessary to gain marketing approvals, and, in the event regulatory authorities indicate that we may submit such applications, we may be 
unable to do so as quickly and efficiently as desired. Securing marketing approval requires the submission of extensive preclinical and clinical data and 
supporting information to regulatory authorities for each therapeutic indication to establish the product candidate’s safety and efficacy. Securing marketing 
approval also requires the submission of information about the product manufacturing process to, and inspection of manufacturing facilities by, the 
regulatory authorities. Our product candidates may not be effective, may be only moderately effective or may prove to have undesirable or unintended side 
effects, toxicities or other characteristics that may preclude our obtaining marketing approval or prevent or limit commercial use. Regulatory authorities 
have substantial discretion in the approval process and may refuse to accept or file any application or may decide that our data are insufficient for approval 
and require additional preclinical, clinical or other studies. In addition, varying interpretations of the data obtained from preclinical and clinical testing 
could delay, limit or prevent marketing approval of a product candidate. 

Approval of STK-001, STK-002 and our other future product candidates may be delayed or refused for many reasons, including: 

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

we may be unable to demonstrate, to the satisfaction of the FDA or comparable foreign regulatory authorities, that our product candidates are 
safe and effective for any of their proposed indications; 

the results of clinical trials may not meet the level of statistical significance or clinical meaningfulness required by the FDA or comparable 
foreign regulatory authorities for approval; 

we may be unable to demonstrate that our product candidates’ clinical and other benefits outweigh their safety risks; 

the FDA or comparable foreign regulatory authorities may disagree with our interpretation of data from preclinical programs or clinical trials; 

the data collected from clinical trials of our product candidates may not be sufficient to support the submission of an NDA or other 
comparable submission in foreign jurisdictions or to obtain regulatory approval in the United States or elsewhere; 

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the facilities of third-party manufacturers with which we contract or procure certain service or raw materials may not be adequate to support 
approval of our product candidates; 

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

potential delays in enrollment, site visits, evaluations, or dosing of patients participating in the clinical trial as hospitals face staffing 
shortages, whether due to labor relations or otherwise, or patients decide to not enroll in the study as a result of or such staffing shortages.

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 upon additional 
government regulation from future legislation or administrative action, or changes in regulatory authority policy during the period of product development, 
clinical trials, a potential temporary federal government shutdown 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 risk evaluation and mitigation strategy (“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 adversely affect our business, 
financial condition, results of operations and prospects. While currently we are not experiencing any significant delays or disruptions to our clinical trials as 
a result of hospital staffing shortages or global macroeconomic conditions, we take into consideration such shortages and conditions may directly or 
indirectly impact our clinical trial enrollment, dosing, and regulatory approval timelines. 

Certain of the diseases we seek to treat have low prevalence, and it may be difficult to identify patients with these diseases, which may lead to delays in 
enrollment for our trials or slower commercial revenue growth if STK-001, STK-002 or our future product candidates are approved. 

Genetically defined diseases generally, and especially those for which our product candidates are targeted, have low incidence and prevalence. We 

estimate that the worldwide incidence of Dravet syndrome is approximately one in 16,000 births, and the incidence of ADOA is approximately one in 
30,000 births. This could pose obstacles to the timely recruitment and enrollment of a sufficient number of eligible patients into our trials or limit a product 
candidate’s commercial potential. Patient enrollment may be affected by other factors including: 

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the ability to identify and enroll patients that meet study eligibility criteria in a timely manner for clinical trials; 

the severity of the disease under investigation; 

design of the study protocol; 

the perceived risks, benefits and convenience of administration of the product candidate being studied; 

the patient referral practices of providers; and 

the proximity and availability of clinical trial sites to prospective patients. 

Any inability to enroll a sufficient number of patients with these diseases for our planned clinical trials would result in significant delays and could 
cause us to not initiate or abandon one or more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs 
for our product candidate, which would cause the value of our company to decline and limit our ability to obtain additional financing. 

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Additionally, our projections of both the number of people who have Dravet syndrome or ADOA, as well as the people with this disease who have 

the potential to benefit from treatment with our product candidates, are based on estimates derived from a market research study that we commissioned, 
which may not accurately identify the size of the market for our product candidates. The total addressable market opportunity for STK-001, STK-002 and 
our future product candidates will ultimately depend upon, among other things, the final labeling for our product candidates, if our product candidates are 
approved for sale in our target indications, acceptance by the medical community and patient access, drug pricing and reimbursement. The number of 
patients globally may turn out to be lower than expected, patients may not be otherwise amenable to treatment with our product candidates, or new patients 
may become increasingly difficult to identify or gain access to, all of which would adversely affect our results of operations and our business.

Moreover, in light of the limited number of potential patients impacted by Dravet syndrome and ADOA, our per-patient therapy pricing of STK-001, 

STK-002 and our future product candidates, if approved, must be high in order to recover our development and manufacturing costs, fund additional 
research and achieve profitability. We may also need to fund patient support programs upon the marketing of a product candidate, which would negatively 
affect our product revenue. We may be unable to maintain or obtain sufficient therapy sales volumes at a price high enough to justify our development 
efforts and our sales, marketing and manufacturing expenses. 

We may not be successful in our efforts to use TANGO to expand our pipeline of product candidates and develop marketable products. 

Because we have limited financial and managerial resources, we focus on research programs and product candidates that we identify for specific 

indications. Our business depends on our successful development and commercialization of the limited number of internal product candidates we are 
researching or have in preclinical development. Even if we are successful in continuing to build our pipeline, development of the potential product 
candidates that we identify will require substantial investment in additional clinical development, management of clinical, preclinical and manufacturing 
activities, regulatory approval in multiple jurisdictions, obtaining manufacturing supply capability, building a commercial organization, and significant 
marketing efforts before we generate any revenue from product sales. Furthermore, such product candidates may not be suitable for clinical development, 
including as a result of their harmful side effects, limited efficacy or other characteristics that indicate that they are unlikely to be products that will receive 
marketing approval and achieve market acceptance. If we cannot validate TANGO by successfully developing and commercializing product candidates 
based upon our technological approach, we may not be able to obtain product revenue in future periods, which would adversely affect our business, 
prospects, financial condition and results of operations. 

In November 2021, we announced the nomination of STK-002 as our lead product candidate for in the treatment of ADOA; however, we are 

primarily focused on our lead product candidate for Dravet syndrome, STK-001, and we may forego or delay pursuit of opportunities with other product 
candidates or for other indications that later prove to have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize 
on viable commercial products or profitable market opportunities. Our spending on current and future research and development programs and product 
candidates for specific indications may not yield any commercially viable products. Our understanding and evaluation of biological targets for the 
discovery and development of new product candidates may fail to identify challenges encountered in subsequent preclinical and clinical development. If we 
do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product 
candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been more advantageous for us to retain sole 
development and commercialization rights. 

Any product candidate for which we obtain marketing approval will be subject to extensive post-marketing regulatory requirements and could be 
subject to post-marketing restrictions or withdrawal from the market, and we may be subject to penalties if we fail to comply with regulatory 
requirements or if we experience unanticipated problems with our product candidates, when and if any of them are approved.

Our product candidates and the activities associated with their development and potential commercialization, including their testing, manufacturing, 

recordkeeping, labeling, storage, approval, advertising, promotion, sale and distribution, are subject to comprehensive regulation by the FDA and other 
U.S. and international regulatory authorities. These requirements include submissions of safety and other post-marketing information and reports, 
registration and listing requirements, requirements relating to manufacturing, including current Good Manufacturing Practices (“GMPs”), quality control, 
quality assurance and corresponding maintenance of records and documents, including periodic inspections by the FDA and other regulatory authorities 
and requirements regarding the distribution of samples to providers and recordkeeping. 

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The FDA may also impose requirements for costly post-marketing studies or clinical trials and surveillance to monitor the safety or efficacy of any 
approved product. The FDA closely regulates the post-approval marketing and promotion of drugs and biologics to ensure they are marketed only for the 
approved indications and in accordance with the provisions of the approved labeling. The FDA imposes stringent restrictions on manufacturers’ 
communications regarding use of their products. If we promote our product candidates in a manner inconsistent with FDA-approved labeling or otherwise 
not in compliance with FDA regulations, we may be subject to enforcement action. Moreover, while we believe our product candidates may provide 
improved safety profiles over existing products, unless we conduct head-to-head studies, we will not be able to make comparative claims for products, if 
approved. Violations of the Federal Food, Drug, and Cosmetic Act (the “FDCA”) relating to the promotion of prescription drugs may lead to investigations 
alleging violations of federal and state healthcare fraud and abuse laws, as well as state consumer protection laws and similar laws in international 
jurisdictions. 

In addition, later discovery of previously unknown adverse events or other problems with our product candidates, manufacturers or manufacturing 

processes, or failure to comply with regulatory requirements, may yield various results, including: 

•

•

•

•

•

•

•

•

•

•

•

•

•

restrictions on such product candidates, manufacturers or manufacturing processes; 

restrictions on the labeling or marketing of a product; 

restrictions on product distribution or use; 

requirements to conduct post-marketing studies or clinical trials; 

warning or untitled letters; 

withdrawal of any approved product from the market; 

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

recall of product candidates; 

fines, restitution or disgorgement of profits or revenues; 

suspension or withdrawal of marketing approvals; 

refusal to permit the import or export of our product candidates; 

product seizure; or 

injunctions or the imposition of civil or criminal penalties. 

Non-compliance with European requirements regarding safety monitoring or pharmacovigilance, and with requirements related to the development 
of products for the pediatric population, can also result in significant financial penalties. Similarly, failure to comply with Europe’s requirements regarding 
the protection of personal information can also lead to significant penalties and sanctions. 

Our failure to obtain regulatory approval in international jurisdictions would prevent us from marketing our product candidates outside the United 
States. 

To market and sell STK-001, STK-002 and our future product candidates, we must obtain separate marketing approvals and comply with numerous 

and varying regulatory requirements. The approval procedure varies among countries and can involve additional testing. The time required to obtain 
approval may differ substantially from that required to obtain FDA approval. The regulatory approval process outside the United States generally includes 
all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, we must secure product reimbursement 
approvals before regulatory authorities will approve the product for sale in that country. Failure to obtain foreign regulatory approvals or non-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. The United Kingdom’s exit from the European Union (the “EU”), which is referred to as “Brexit,” became fully 
effective on December 31, 2020. Brexit continues to create political and economic uncertainty, particularly in the United Kingdom and the EU. Prior to 
Brexit, a significant proportion of the regulatory framework in the United Kingdom was derived from EU directives and regulations. Following Brexit, the 
United Kingdom retained the EU regulatory regime with certain modifications as standalone U.K. legislation. Therefore, the U.K. regulatory regime is 
currently similar to EU regulations, but the United Kingdom has enacted new legislation, the Medicines and Medical Devices Act. Under this legislation, 
the U.K. 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. Brexit may lead to additional regulatory costs and could 
materially impact the regulatory regime with respect to the approval of our product candidates in the United Kingdom or the EU.

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If we fail to comply with the regulatory requirements in international markets and receive applicable marketing approvals, 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 will be adversely affected. We may 
not obtain foreign regulatory approvals on a timely basis, if at all. Our failure to obtain approval of any of our product candidates by regulatory authorities 
in another country may significantly diminish the commercial prospects of that product candidate and our business prospects could decline. 

STK-001, STK-002 or our future product candidates may cause undesirable and unforeseen side effects or be perceived by the public as unsafe, which 
could delay or prevent their advancement into clinical trials or regulatory approval, limit the commercial potential or result in significant negative 
consequences. 

Although other ASOs have received regulatory approval, our method of seeking to upregulate protein expression by targeting the underlying genetic 

causes of haploinsufficiencies presents a new approach to disease treatment, which means there is uncertainty associated with the safety profile of STK-
001, STK-002 or our future product candidates and drugs in the antisense oligonucleotide class. 

In addition to side effects caused by our product candidates, the intrathecal or intravitreal administration process or related procedures also can cause 
adverse side effects. If any such adverse events occur, our clinical trials could be suspended or terminated. If we are unable to demonstrate that any adverse 
events were caused by the administration process or related procedures, the FDA, the European Commission, the EMA, the U.K. MHRA or other 
regulatory authorities could order us to cease further development of, or deny approval of, our product candidates for any or all targeted indications. Even if 
we can demonstrate that 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 not initiate, delay, suspend or terminate any future 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 adversely affect our 
business, financial condition, results of operations and prospects significantly. Finally, SPINRAZA, which is produced by Biogen Inc., is an ASO therapy 
utilizing intrathecal delivery, and if SPINRAZA is found to cause undesirable side effects or to be unsafe due to a potential class effect, it may adversely 
affect demand for STK-001 and our other future product candidates. Other ASOs in clinical development utilizing intrathecal delivery could also generate 
data that could adversely affect the clinical, regulatory or commercial perception of STK-001 and our other future product candidates. 

Additionally, if any of our product candidates receives marketing approval, the FDA could require us to adopt a REMS to ensure that the benefits of 

the product outweigh its risks, which may include, for example, a Medication Guide outlining the risks of the product for distribution to patients and a 
communication plan to health care practitioners, or other elements to assure safe use of the product. Furthermore, if we or others later identify undesirable 
side effects caused by our product candidate, several potentially significant negative consequences could result, including: 

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•

•

•

•

regulatory authorities may suspend or withdraw approvals of such product candidate; 

regulatory authorities may require additional warnings in the labeling; 

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

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

our reputation may suffer. 

Any of these occurrences may harm our business, financial condition, results of operations and prospects significantly. 

A Rare Pediatric Disease designation by the FDA does not guarantee that the NDA for the product will qualify for a priority review voucher upon 
approval, and it does not lead to a faster development or regulatory review process, or increase the likelihood that STK-001, STK-002 or our future 
product candidates will receive marketing approval.

Under the Rare Pediatric Disease Priority Review Voucher program, upon the approval of a qualifying NDA for the treatment of a rare pediatric 

disease, the sponsor of such an application would be eligible for a rare pediatric disease priority review voucher that can be used to obtain priority review 
for a subsequent Biologics License Application or NDA. As part of our business strategy for STK-001, we received Rare Pediatric Disease Designation in 
October 2022. We may also seek Rare Pediatric Disease designations for any other future product candidates. If a product candidate is designated before 
September 30, 2024, it is eligible to receive a voucher if it is approved before September 30, 2026. However, there is no expectation that STK-001, STK-
002 or our future product candidates will be designated, other than STK-001, or approved by those dates, or at all, or that the program will be further 
extended, and, therefore, we may not be in a position to obtain any priority review vouchers. Additionally, designation of a drug for a rare pediatric disease 
does not guarantee that an NDA will meet the 

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eligibility criteria for a rare pediatric disease priority review voucher at the time the application is approved. Finally, a Rare Pediatric Disease Designation 
does not lead to faster development or regulatory review of the product or increase the likelihood that it will receive marketing approval.

A Fast Track Designation by the FDA, even if granted for STK-001, STK-002 or any of our future product candidates, or any use of the accelerated 
approval pathway, may not lead to a faster development or regulatory review or approval process, and would not increase the likelihood that our 
product candidates will receive marketing approval. 

If a drug is intended for the treatment of a serious or life-threatening condition and the drug demonstrates the potential to address unmet medical 

needs for this condition, the drug sponsor may apply to the FDA for Fast Track Designation. The FDA has broad discretion whether to grant this 
designation. Even if we believe a particular product candidate is eligible for this designation, we cannot assure you that the FDA would decide to grant it. 
Even if we do receive Fast Track Designation for any of our product candidates, we may not experience a faster development process, review or approval 
compared to conventional FDA procedures. The FDA may withdraw Fast Track Designation if it believes that the designation is no longer supported by 
data from our clinical development program. Many drugs that have received Fast Track Designation have failed to obtain approval. 

We may also seek accelerated approval for our product candidates. Under the FDA’s accelerated approval program, the FDA may approve a drug for 
a serious or life-threatening illness that provides meaningful therapeutic benefit to patients over existing treatments based upon a surrogate endpoint that is 
reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably 
likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity or prevalence of the 
condition and the availability or lack of alternative treatments. Full approval of another product for the same indication as any of our product candidates for 
which we are seeking accelerated approval may make accelerated approval of our product candidates more difficult. For drugs granted accelerated 
approval, post-marketing confirmatory trials are required to describe the anticipated effect on irreversible morbidity or mortality or other clinical benefit. 
These confirmatory trials must be completed with due diligence and in general the FDA may require that the trial be designed and/or initiated prior to 
approval. The Food and Drug Omnibus Reform Act (“FDORA”) was recently enacted, which included provisions related to the accelerated approval 
pathway. Pursuant to FDORA, the FDA is authorized to require a post-approval study to be underway prior to approval or within a specified time period 
following approval. FDORA also requires the FDA to specify conditions of any required post-approval study, which may include milestones and requires 
sponsors to submit progress reports for required post-approval studies and any conditions required by the FDA. FDORA enables the FDA to initiate 
enforcement action for the failure to conduct with due diligence a required post-approval study, including a failure to meet any required conditions 
specified by the FDA or to submit timely reports. All promotional materials for product candidates approved via accelerated approval are subject to prior 
review by the FDA. Moreover, the FDA may withdraw approval of any product candidate or indication approved under the accelerated approval pathway 
if, for example:

•

•

•

•

the trial or trials required to verify the predicted clinical benefit of the product candidate fail to verify such benefit or do not demonstrate 
sufficient clinical benefit to justify the risks associated with the drug; 

other evidence demonstrates that the product candidate is not shown to be safe or effective under the conditions of use; 

we fail to conduct any required post-approval trial of the product candidate with due diligence; or 

we disseminate false or misleading promotional materials relating to the product candidate. 

A Breakthrough Therapy Designation by the FDA, even if granted for STK-001, STK-002 or any of our future product candidates, may not lead to a 
faster development or regulatory review or approval process, and it would not increase the likelihood that the product candidate will receive marketing 
approval. 

We may seek a Breakthrough Therapy Designation for STK-001, STK-002 or one or more of our future product candidates. A breakthrough therapy 

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

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Designation as a breakthrough therapy is at the discretion of the FDA. Accordingly, even if we believe that one of our product candidates meets the 
criteria for designation as a breakthrough therapy, the FDA may disagree and instead determine not to make such designation. In any event, the receipt of a 
Breakthrough Therapy Designation for a drug may not result in a faster development process, review, or approval compared to drugs considered for 
approval under conventional FDA procedures and it would not assure ultimate approval by the FDA. In addition, even if one or more of our product 
candidates qualify as breakthrough therapies, the FDA may later decide that the product candidate no longer meets the conditions for qualification or it may 
decide that the time period for FDA review or approval will not be shortened. 

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

Existing regulatory policies may change, and additional government regulations may be enacted that could prevent, limit or delay regulatory 

approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or 
administrative action, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the adoption of new 
requirements or policies, or if we are not able to maintain regulatory compliance, we may not obtain or may lose any marketing approval that we may have 
obtained and we may not achieve or sustain profitability. 

In addition, in the United States, there have been and continue to be a number of legislative initiatives to contain healthcare costs. The 

pharmaceutical industry has been a particular focus of these efforts and has been significantly affected by major legislative initiatives. Previously, in March 
2010, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010 (collectively, the “ACA”) 
was enacted, which was intended to broaden access to health insurance, reduce or constrain the growth of healthcare spending, enhance remedies against 
fraud and abuse, add new transparency requirements for health care and health insurance industries, impose new taxes and fees on the health industry and 
impose additional health policy reforms.

Healthcare reform initiatives recently culminated in the enactment of the Inflation Reduction Act (“IRA”) in August 2022, which, among other 
things, allows U.S. Department of Health and Human Services (“HHS”) to directly negotiate the selling price of a statutorily specified number of drugs and 
biologics each year that the Centers for Medicare & Medicaid Services (“CMS”) reimburses under Medicare Part B and Part D. Only high-expenditure 
single-source drugs that have been approved for at least 7 years (11 years for single-source biologics) are eligible be selected by CMS for negotiation, with 
the negotiated price taking effect two years after the selection year. Negotiations for Medicare Part D products take place in 2024 with the negotiated price 
taking effect in 2026, and negotiations for Medicare Part B products will begin in 2026 with the negotiated price taking effect in 2028. In August 2023, 
HHS announced the ten Medicare Part D drugs and biologics that it selected for negotiations. HHS will announce the negotiated maximum fair prices by 
September 1, 2024, and this price cap, which cannot exceed a statutory ceiling price, will go into effect on January 1, 2026. A drug or biological product 
that has an orphan drug designation for only one rare disease or condition will be excluded from the IRA’s price negotiation requirements, but will lose that 
exclusion if it receives designations for more than one rare disease or condition, or if is approved for an indication that is not within that single designated 
rare disease or condition, unless such additional designation or such disqualifying approvals are withdrawn by the time CMS evaluates the drug for 
selection for negotiation. The negotiated prices will represent a significant discount from average prices to wholesalers and direct purchasers. The law also 
imposes rebates on Medicare Part D and Part B drugs whose prices have increased at a rate greater than the rate of inflation. In addition, the law eliminates 
the “donut hole” under Medicare Part D beginning in 2025 by significantly lowering the beneficiary maximum out-of-pocket cost through a newly 
established manufacturer discount program which requires manufacturers to subsidize 10% of Part D enrollees’ prescription costs for brand drugs below 
the out-of-pocket maximum, and 20% once the out-of-pocket maximum has been reached. The IRA also extends enhanced subsidies for individuals 
purchasing health insurance coverage in ACA marketplaces through plan year 2025. The IRA permits the Secretary of HHS to implement many of these 
provisions through guidance, as opposed to regulation, for the initial years. Manufacturers that fail to comply with the IRA may be subject to various 
penalties, including civil monetary penalties. These provisions may be subject to legal challenges. For example, the provisions related to the negotiation of 
selling prices of high-expenditure single-source drugs and biologics have been challenged in multiple lawsuits brought by pharmaceutical manufacturers. 
Thus, while it is unclear how the IRA will be implemented, it will likely have a significant impact on the pharmaceutical industry.

In addition, other legislative changes have been proposed and adopted. These changes included aggregate reductions of Medicare payments to 
providers of up to 2% per fiscal year, which went into effect in 2013, and will remain in effect through 2031, with the exception of a temporary suspension 
implemented under various COVID-19 relief legislation from May 1, 2020 through March 31, 2022, unless additional Congressional action is taken. In 
January 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, reduced Medicare payments to several providers, 
and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These new laws may result 
in additional reductions in Medicare and other healthcare funding, which could have a material 

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adverse effect on customers for our drugs, if approved, and accordingly, our financial operations. Additionally, on May 30, 2018, the Trickett Wendler, 
Frank Mongiello, Jordan McLinn, and Matthew Bellina Right to Try Act of 2017 was signed into law. The law, among other things, provides a federal 
framework for certain patients to access certain investigational new drug products that have completed a Phase 1 clinical trial and that are undergoing 
investigation for FDA approval. Under certain circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining 
FDA authorization under an FDA expanded access program; however, manufacturers are not obligated to provide investigational new drug products under 
the current federal right to try law. We may choose to seek an expanded access program for our product candidates, or to utilize comparable rules in other 
countries that allow the use of a drug, on a named patient basis or under a compassionate use program.

Furthermore, there have been, and continue to be, a number of other initiatives at the United States federal and state levels that seek to reduce 
healthcare costs. For example, in December 2020, CMS issued a final rule implementing significant manufacturer price reporting changes under the 
Medicaid Drug Rebate Program, including an alternative rebate calculation for line extensions that is tied to the price increases of the original drug, and 
Best Price reporting related to certain value-based purchasing arrangements. Additionally, under the American Rescue Plan Act of 2021, effective January 
1, 2024, the statutory cap on Medicaid Drug Rebate Program rebates that manufacturers pay to state Medicaid programs on a unit of drug is eliminated. 
Elimination of this cap may, in some cases, require pharmaceutical manufacturers to pay more in rebates than they receive on the sale of products. Further, 
the Infrastructure Investment and Jobs Act added a requirement, effective January 1, 2023, for manufacturers of certain single-source drugs separately paid 
for under Medicare Part B for at least 18 months and marketed in single-dose containers or packages (known as refundable single-dose containers or single-
use package drugs) to provide annual refunds for any portions of the dispensed drug that are unused and discarded if those unused or discarded portions 
exceed an applicable percentage defined by statute or regulation. Manufacturers are subject to periodic audits and those that fail to pay refunds for their 
refundable single-dose containers or single-use package drugs shall be subject to civil monetary penalties. Healthcare reforms that have been adopted, and 
that may be adopted in the future, could result in further reductions in coverage and levels of reimbursement for pharmaceutical products, increases in 
rebates payable under U.S. government rebate programs and additional downward pressure on pharmaceutical product prices.

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

At the state level in the United States, legislatures are increasingly enacting laws and implementing regulations designed to control pharmaceutical 

and biologic product pricing, including price constraints, restrictions on certain product access, reporting on price increases and the introduction of high-
cost drugs.

Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional activities for 

pharmaceutical products. We cannot be sure whether additional legislative changes will be enacted, or whether FDA regulations, guidance or 
interpretations will be changed, or what the impact of such changes on the marketing approvals of our product candidates, if any, may be. In addition, 
increased scrutiny by the U.S. Congress of the FDA’s approval process may significantly delay or prevent marketing approval, as well as subject us to more 
stringent product labeling and post-marketing testing and other requirements. 

We may be unsuccessful in obtaining Orphan Drug Designation or transfer of designations obtained by others for future product candidates. And, even 
if we obtain such designation, we may be unable to maintain the benefits associated with Orphan Drug Designation, including the potential for market 
exclusivity, for STK-001, STK-002 or our future product candidates.

As part of our business strategy for STK-001, we received Orphan Drug Designation for the treatment of Dravet syndrome in the United States in 

2019 and also in the EU in 2022. As part of our business strategy for STK-002, we received Orphan Drug Designation for the treatment of autosomal 
dominant optic atrophy (ADOA) in the United States in 2022. We may seek such designations for our product candidates in other countries as well. 
However, Orphan Drug Designation does not guarantee future orphan drug marketing exclusivity, and there is no guarantee that we will be successful in 
obtaining such designation for our future product candidates.

Regulatory authorities in some jurisdictions, including the United States and Europe, may designate drugs intended to treat relatively small patient 

populations as orphan drugs. Under the Orphan Drug Act, the FDA may designate a drug as an orphan drug if it is intended to treat a rare disease or 
condition, which is defined as a patient population of fewer than 200,000 individuals in the United States. In the United States, Orphan Drug Designation 
entitles a party to financial incentives such as opportunities for tax credits for qualified clinical research costs and exemption from prescription drug user 

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fees. Similarly, in the EU, the European Commission grants Orphan Drug Designation after receiving the opinion of the EMA’s Committee for Orphan 
Medicinal Products on an Orphan Drug Designation application. In the EU, Orphan Drug Designation is intended to promote the development of drug that 
are intended for the diagnosis, prevention or treatment of life-threatening or chronically debilitating conditions affecting not more than five in 10,000 
persons in the EU and for which no satisfactory method of diagnosis, prevention or treatment has been authorized (or the product would be a significant 
benefit to those affected). In the EU, Orphan Drug Designation entitles a party to financial incentives such as reduction of fees or fee waivers. 

Generally, if a drug with an Orphan Drug Designation subsequently receives the first marketing approval for the indication for which it has such 

designation, the drug is entitled to a period of marketing exclusivity, which precludes EMA or the FDA from approving another marketing application for 
the same drug and indication for that time period, except in limited circumstances. If a competitor is able to obtain orphan drug exclusivity prior to us for a 
product that constitutes the same active moiety and treats the same indications as our product candidates, we may not be able to obtain approval of our drug 
by the applicable regulatory authority for a significant period of time unless we are able to show that our drug is clinically superior to the approved drug. 
The applicable period is seven years in the United States and ten years in the EU. The EU exclusivity period can be reduced to six years if a drug no longer 
meets the criteria for Orphan Drug Designation or if the drug is sufficiently profitable so that market exclusivity is no longer justified. 

Even after an orphan drug is approved, the FDA can also subsequently approve a later application for the same drug for the same condition if the 
FDA concludes that the later drug is clinically superior in that it is shown to be safer in a substantial portion of the target populations, more effective or 
makes a major contribution to patient care. In addition, a designated orphan drug may not receive orphan drug exclusivity if it is approved for a use that is 
broader than the indication for which it received orphan designation. Moreover, orphan drug exclusive marketing rights in the United States may be lost if 
the FDA later determines that the request for designation was materially defective or if we are unable to manufacture sufficient quantities of the product to 
meet the needs of patients with the rare disease or condition. Orphan Drug Designation neither shortens the development time or regulatory review time of 
a drug nor gives the drug any advantage in the regulatory review or approval process. 

The orphan drug exclusivity contained in the Orphan Drug Act has been the subject of recent scrutiny from the press, from some members of 
Congress and from some in the medical community. Furthermore, the FDA’s interpretations of the Orphan Drug Act have not been successfully challenged 
in court and future court decisions could continue that trend. There can be no assurances that the exclusivity granted to orphan drugs approved by the FDA 
will not be modified in the future, or as to how any such changes might affect our products, if approved.

The FDA’s and the MHRA’s ability to review and approve new products may be hindered by a variety of factors, including budget and funding levels, 
government shutdowns, ability to hire and retain key personnel, and statutory, regulatory and policy changes. 

The ability of the FDA and the MHRA to review and approve new products can be affected by a variety of factors, including budget and funding 
levels, government shutdowns, ability to hire and retain key personnel, and statutory, regulatory, and policy changes. In addition, government funding of 
other government agencies that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable. 

The ability of the FDA, the MHRA and other government agencies to properly administer their functions is highly dependent on the levels of 

government funding and the ability to fill key leadership appointments, among various factors. Delays in filling or replacing key positions could 
significantly impact the ability of the FDA, the MHRA and other agencies to fulfill their functions and could greatly impact healthcare and the 
pharmaceutical industry. 

In December 2016, the 21st Century Cures Act was signed into law, and was designed to advance medical innovation and empower the FDA with 

the authority to directly hire positions related to drug and device development and review. In the past, the FDA was often unable to offer key leadership 
candidates (including scientists) competitive compensation packages as compared to those offered by private industry. The 21st Century Cures Act is 
designed to streamline the agency’s hiring process and enable the FDA to compete for leadership talent by expanding the narrow ranges that are provided in 
the existing compensation structures. 

Disruptions at the FDA, the MHRA and other governmental agencies may also slow the time necessary for new drugs to be reviewed or approved 

by necessary government agencies, which would adversely affect our operating results and business. 

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Our operations and relationships with future customers, providers and third-party payors will be subject to applicable anti-kickback, fraud and abuse 
and other healthcare laws and regulations, which could expose us to penalties including criminal sanctions, civil penalties, contractual damages, 
reputational harm and diminished profits and future earnings. 

Healthcare providers and third-party payors will play a primary role in the recommendation and prescription of any product candidates for which we 
obtain marketing approval. Our future arrangements with providers, third-party payors and customers will subject us to broadly applicable fraud and abuse 
and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market, sell and 
distribute any product candidates for which we obtain marketing approval. 

Restrictions under applicable U.S. federal and state healthcare laws and regulations include the following: 

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the federal Anti-Kickback Statute prohibits, among other things, persons and entities from knowingly and willfully soliciting, offering, 
receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, either the referral of an 
individual for, or the purchase, order or recommendation of, any good or service, for which payment may be made under government 
healthcare programs such as Medicare and Medicaid, and a person or entity does not need to have actual knowledge of the statute or specific 
intent to violate it in order to have committed a violation; 

federal false claims laws, including the federal False Claims Act, imposes criminal and civil penalties, including through civil whistleblower 
or qui tam actions, against individuals or entities for knowingly presenting, or causing to be presented, to the federal government, claims for 
payment that are false or fraudulent (including claims for items and services resulting from a violation of the federal Anti-Kickback Statute) 
or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal government, and certain marketing 
practices, including off-label promotion, may also violate false claims laws; 

the federal Health Insurance Portability and Accountability Act of 1996 (“HIPAA”) imposes criminal and civil liability for, among other 
things, knowingly and willfully executing or attempting to execute a scheme to defraud any healthcare benefit program or making false 
statements relating to healthcare matters; 

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act (“HITECH”) and its implementing 
regulations, also imposes obligations, including mandatory contractual terms, on certain types of people and entities with respect to 
safeguarding the privacy, security and transmission of individually identifiable health information; 

the federal Physician Payment Sunshine Act requires applicable manufacturers of covered drugs, devices, biologics, and medical supplies for 
which payment is available under Medicare, Medicaid, or the Children’s Health Insurance Program, with specific exceptions, to report 
annually payments and other transfers of value to physicians, physician assistants, certain types of advance practice nurses and teaching 
hospitals, or to entities or individuals at the request of, or designated on behalf of, such providers, and to report annually certain ownership 
and investment interests held by physicians and their immediate family, which includes annual data collection and reporting obligations; and 

analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing 
arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private 
insurers. 

Some state and local laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the 

relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information related to payments and 
other transfers of value to physicians and other healthcare providers. Other state laws require pharmaceutical companies to report marketing expenditures 
or price increases that exceed a statutory threshold, as well as information on the reasons for the price increase, or to report the introduction into the market 
of costly drugs. State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each 
other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts. 

Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve 

substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, 
regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any 
of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, 
damages, fines, imprisonment, exclusion of product candidates from government-funded healthcare programs, such as Medicare and Medicaid, 
disgorgement, contractual damages, reputational harm, diminished profits and future earnings, and the curtailment 

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

Risks Related to Commercialization and Manufacturing 

The commercial success of our product candidates, including STK-001 and STK-002, will depend upon their degree of market acceptance by providers, 
patients, patient advocacy groups, third-party payors and the general medical community. 

Ethical, social and legal concerns about genetic treatments generally could result in additional regulations restricting or prohibiting our product 
candidates. Even with the requisite approvals from the FDA, the MHRA, the EMA and other regulatory authorities internationally, the commercial success 
of our product candidates will depend, in part, on the acceptance of providers, patients and third-party payors of drugs designed to increase protein 
expression in general, and our product candidates in particular, as medically necessary, cost-effective and safe. In addition, we may face challenges in 
seeking to establish and grow sales of STK-001, STK-002 and any future product candidates, including acceptance of intravitreal injection, the lumbar 
puncture and intrathecal administration, which carries risks of infection or other complications. Any product that we commercialize may not gain 
acceptance by providers, patients, patient advocacy groups, third-party payors and the general 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 genetic 
medicines and, in particular, STK-001, STK-002 and our future product candidates, if approved for commercial sale, will depend on several factors, 
including: 

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

the potential and perceived advantages of product candidates over alternative treatments; 

the cost of treatment relative to alternative treatments; 

the clinical indications for which the product candidate is approved by the FDA, the MHRA or the European Commission; 

the willingness of providers to prescribe new therapies; 

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

the prevalence and severity of any side effects; 

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

the willingness of providers to prescribe, and of patients to receive, intrathecal injections; 

the strength of marketing and distribution support; 

the timing of market introduction of competitive products; 

the quality of our relationships with patient advocacy groups; 

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

sufficient third-party payor coverage and adequate reimbursement. 

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

will not be fully known until after it is launched. 

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

Our target indications, including Dravet syndrome and ADOA, are indications with small patient populations. For product candidates that are 
designed to treat smaller patient populations to be commercially viable, the reimbursement for such product candidates must be higher, on a relative basis, 
to account for the lack of volume. Accordingly, we will need to implement a coverage and reimbursement strategy for any approved product candidate that 
accounts for the smaller potential market size. If we are unable to establish or sustain coverage and adequate reimbursement for any future product 
candidates from third-party payors, the adoption of those product candidates and sales revenue will be adversely affected, which, in turn, could adversely 
affect the ability to market or sell those product candidates, if approved. 

We expect that coverage and reimbursement by third-party payors will be essential for most patients to be able to afford these treatments. 
Accordingly, sales of STK-001, STK-002 and our future product candidates will depend substantially, both domestically and internationally, on the extent 
to which the costs 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. Even if coverage is provided, 
the approved reimbursement amount may not be high enough to allow us to establish or maintain pricing sufficient to realize a sufficient return on our 
investment. 

There is significant uncertainty related to the insurance coverage and reimbursement of newly approved products. In the United States, the principal 

decisions about reimbursement by government authorities for new products are typically made by the CMS since it decides whether and to what extent a 
new product will be covered and reimbursed under Medicare. Private payors tend to follow CMS to a substantial degree. However, one payor’s 
determination to provide coverage for a drug product does not assure that other payors will also provide coverage for the drug product. Further, a payor’s 
decision to provide coverage for a drug product does not imply that an adequate reimbursement rate will be approved. Reimbursement agencies in Europe 
may be more conservative than CMS. For example, a number of cancer drugs have been approved for reimbursement in the United States and have not 
been approved for reimbursement in certain European countries. 

Outside the United States, international operations are generally subject to extensive governmental price controls and other market regulations, and 

we believe the increasing emphasis on cost-containment initiatives in Europe, Canada and other countries has and will continue to put pressure on the 
pricing and usage of therapeutics such as our product candidates. In many countries, particularly the countries of the EU, the prices of medical products are 
subject to varying price control mechanisms as part of national health systems. In these countries, pricing negotiations with governmental authorities can 
take considerable time after the receipt of marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we may be 
required to conduct a clinical trial that compares the cost-effectiveness of our product candidate to other available therapies. In general, the prices of 
products under such systems are substantially lower than in the United States. Other countries allow companies to fix their own prices for 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 product candidates may be reduced 
compared with the United States and may be insufficient to generate commercially reasonable revenues and profits. 

Moreover, increasing efforts by governmental and third-party payors, in the United States and internationally, to cap or reduce healthcare costs may 

cause such organizations to limit both coverage and level of reimbursement for new products approved and, as a result, they may not cover or provide 
adequate payment for our product candidates. 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 certain third-party payors, such as health maintenance organizations, and additional 
legislative changes. The downward pressure on healthcare costs in general, particularly prescription drugs and surgical procedures and other treatments, has 
become very intense. As a result, increasingly high barriers are being erected to the entry of new products into the healthcare market. Recently there have 
been instances in which third-party payors have refused to reimburse treatments for patients for whom the treatment is indicated in the FDA-approved 
product label. Even if we are successful in obtaining FDA approvals to commercialize our product candidates, we cannot guarantee that we will be able to 
secure reimbursement for all patients for whom treatment with our product candidates is indicated. 

In addition to CMS and private payors, professional organizations such as the American Medical Association can influence decisions about 
reimbursement for new products by determining standards for care. In addition, many private payors contract with commercial vendors who sell software 
that provide guidelines that attempt to limit utilization of, and therefore reimbursement for, certain products deemed to provide limited benefit to existing 
alternatives. Such organizations may set guidelines that limit reimbursement or utilization of our product candidates. Even if favorable coverage and 
reimbursement status is attained for one or more product candidates for which we or our collaborators receive regulatory approval, less favorable coverage 
policies and reimbursement rates may be implemented in the future. 

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If third parties on which we depend to conduct our planned preclinical studies, any future clinical trials, or manufacturing of our product candidates 
do not perform as contractually required, fail to satisfy regulatory or legal requirements or miss expected deadlines, our development program could be 
delayed with adverse effects on our business, financial condition, results of operations and prospects. 

We rely on third parties for genetic testing, and on third-party CROs, CMOs, consultants and others to design, conduct, supervise and monitor key 

activities relating to, discovery, manufacturing, preclinical studies and clinical trials of our product candidates, and we intend to do the same for future 
activities relating to existing and future programs. Because we rely on third parties and do not have the ability to conduct all required testing, discovery, 
manufacturing, preclinical studies or clinical trials independently, we have less control over the timing, quality and other aspects of discovery, 
manufacturing, preclinical studies and clinical trials than we would if we conducted them on our own. These investigators, CROs, CMOs and consultants 
are not our employees and we have limited control over the amount of time and resources that they dedicate to our programs. These third parties may have 
contractual relationships with other entities, some of which may be our competitors, which may draw time and resources from our programs. The third 
parties we contract with might not be diligent, careful or timely in conducting our discovery, manufacturing, preclinical studies or clinical trials, resulting in 
testing, discovery, manufacturing, preclinical studies or clinical trials being delayed or unsuccessful, in whole or in part. In addition, these third parties may 
be subject to macroeconomic conditions, such as staffing shortages and supply chain or inflationary pressures that limit their ability to achieve anticipated 
timelines or result in a greater cost to us. For example, we are aware of a shortage of NHPs available for preclinical studies and although that is not 
expected to impact our current business, if we begin new product development programs we could be subject to longer development times or difficulty 
completing necessary research.

If we cannot contract with acceptable third parties on commercially reasonable terms, or at all, or if these third parties do not carry out their 
contractual duties, satisfy legal and regulatory requirements for the conduct of preclinical studies or clinical trials or meet expected deadlines, our clinical 
development programs could be delayed and otherwise adversely affected. In all events, we are responsible for ensuring that each of our preclinical studies 
and clinical trials is conducted in accordance with the general investigational plan and protocols for the trial as well as regulatory requirements. Our 
reliance on third parties that we do not control does not relieve us of these responsibilities and requirements. Any such event could have an adverse effect 
on our business, financial condition, results of operations and prospects. 

We face significant competition in an environment of rapid technological change and it is possible that our competitors may achieve regulatory 
approval before us or develop therapies that are more advanced or effective than ours, which may harm our business, financial condition and our 
ability to successfully market or commercialize STK-001, STK-002 and our future product candidates. 

The biotechnology and pharmaceutical industries, including the genetic medicine and antisense oligonucleotide fields, are characterized by rapidly 
changing technologies, competition and a strong emphasis on intellectual property. We are aware of several companies focused on developing RNA-based 
treatments in various indications as well as several companies addressing other methods for modifying genes and regulating protein expression. We also 
expect to face competition from large and specialty pharmaceutical and biotechnology companies, academic research institutions, government agencies and 
public and private research institutions. 

Numerous treatments for epilepsy exist, including 5-HT agonists, such as UCB’s Fintepla, cannabidiols, such as Jazz Pharmaceuticals’ Epidiolex, 
GABA receptor agonists, such as clobazam and stiripentol, and glutamate blockers, which is one of the mechanisms of action of topiramate. In addition, 
numerous compounds are in clinical development for treatment of epilepsy. We believe the clinical development pipeline includes cannabinoids, 5-HT 
release stimulants, cholesterol 24-hydroxylase inhibitors, potassium channel openers, and sodium channel agonists from a variety of companies. In addition 
to competition from these small molecule drugs, any products we may develop may also face competition from other types of therapies, such as gene 
therapy, gene editing, tRNA therapies, modified mRNA therapies or other ASO approaches. For example, one company (Encoded Therapeutics) has 
announced a clinical development plan for a gene regulation therapy in Dravet syndrome that may address the underlying genetic cause of the disease.

Many of our potential competitors, alone or with their strategic partners, have substantially greater financial, technical and other resources than we 

do, 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 product candidates that we may develop. Competitors also may obtain FDA or other regulatory approval for 
their products more rapidly 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, if ever. Additionally, 

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new or advanced technologies developed by our competitors may render our current or future product candidates uneconomical or obsolete, and we may 
not be successful in marketing our product candidates against competitors. 

To become and remain profitable, we must develop and eventually commercialize product candidates with significant market potential, which will 

require us to be successful in a range of challenging activities. These activities include, among other things, completing preclinical studies and initiating 
and completing clinical trials of our product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling 
those products that are approved 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 generate revenues that are significant or large enough to achieve profitability. If we do achieve profitability, we may not be able to sustain or 
increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of 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. 

The manufacture of drugs is complex and our third-party manufacturers may encounter difficulties in production. If any of our third-party 
manufacturers encounter such difficulties, our ability to provide supply of STK-001, STK-002 or our future product candidates for clinical trials, our 
ability to obtain marketing approval, or our ability to provide supply of our product candidates for patients, if approved, could be delayed or stopped. 

We have established manufacturing relationships with a limited number of suppliers to manufacture raw materials and the drug substance of any 
product candidate for which we are responsible for preclinical or clinical development. Each supplier may require licenses to manufacture such components 
if such processes are not owned by the supplier or in the public domain. As part of any marketing approval, a manufacturer and its processes are required to 
be qualified by the FDA prior to commercialization. If supply from the approved vendor is interrupted, there could be a significant disruption in 
commercial supply. An alternative vendor would need to be qualified through an NDA supplement which could result in further delay. The FDA or other 
regulatory agencies outside of the United States may also require additional studies if a new supplier is relied upon for the manufacture of clinical trial 
materials or commercial production. Switching vendors may involve substantial costs and is likely to result in a delay in our desired clinical and 
commercial timelines. 

The process of manufacturing drugs is complex, highly-regulated and subject to multiple risks. Manufacturing drugs is highly susceptible to product 

loss due to contamination, equipment failure, improper installation or operation of equipment, vendor or operator error, inconsistency in yields, variability 
in product characteristics and difficulties in scaling the production process. Even minor deviations from normal manufacturing processes could result in 
reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered at the facilities of our 
manufacturers, such facilities may need to be closed for an extended period of time to investigate and remedy the contamination, which could delay clinical 
trials and adversely harm our business. Moreover, if the FDA determines that our manufacturers are not in compliance with FDA laws and regulations, 
including those governing CGMPs, the FDA may deny NDA approval until the deficiencies are corrected or we replace the manufacturer in our NDA with 
a manufacturer that is in compliance. 

In addition, there are risks associated with large scale manufacturing for clinical trials or commercial scale including, among others, cost overruns, 

potential problems with process scale-up, process reproducibility, stability issues, compliance with good manufacturing practices, lot consistency and 
timely availability of raw materials. Even if we or our collaborators obtain regulatory approval for any of our product candidates, there is no assurance that 
manufacturers will be able to manufacture the approved product to specifications acceptable to the FDA or other regulatory authorities, to produce it in 
sufficient quantities to meet the requirements for the potential launch of the product or to meet potential future demand. If our manufacturers are unable to 
produce sufficient quantities for clinical trials or for commercialization, research and commercialization efforts would be impaired, which would have an 
adverse effect on our business, financial condition, results of operations and prospects. 

Our reliance on a limited number of manufacturers, the complexity of drug manufacturing and the difficulty of scaling up a manufacturing process 

could cause the delay of clinical trials, regulatory submissions, required approvals or commercialization of our product candidates, cause us to incur higher 
costs and prevent us from commercializing our product candidates successfully. Furthermore, if our suppliers fail to deliver the required commercial 
quantities of materials on a timely basis and at commercially reasonable prices, and we are unable to secure one or more replacement suppliers capable of 
production in a timely manner at a substantially equivalent cost, our clinical trials may be delayed or we could lose potential revenue. 

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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 STK-001, STK-002 and our 
future product candidates, we may be unable to generate any revenues. 

We currently do not have an organization for the sales, marketing and distribution of STK-001, STK-002 and our future product candidates and the 
cost of establishing and maintaining such an organization may exceed the cost-effectiveness of doing so. To market any products that may be approved, we 
must build our sales, marketing, managerial and other non-technical capabilities or make arrangements with third parties to perform these services. With 
respect to certain of our current programs as well as future programs, we may rely completely on an alliance partner for sales and marketing. In addition, 
although we intend to establish a sales organization if we are able to obtain approval to market any product candidates, we may enter into strategic alliances 
with third parties to develop and commercialize STK-001, STK-002 and other future product candidates, including in markets outside of the United States 
or for other large markets that are beyond our resources. This will reduce the revenue generated from the sales of these products. 

Any future strategic alliance partners may not dedicate sufficient resources to the commercialization of our product candidates or may otherwise fail 
in their commercialization due to factors beyond our control. If we are unable to establish effective alliances to enable the sale of our product candidates to 
healthcare professionals and in geographical regions, including the United States, that will not be covered by our own marketing and sales force, or if our 
potential future strategic alliance partners do not successfully commercialize the product candidates, our ability to generate revenues from product sales 
will be adversely affected. 

If we are unable to establish adequate sales, marketing and distribution capabilities, whether independently or with third parties, we may not be able 
to generate sufficient product revenue and may not become profitable. We will be competing with many companies that currently have extensive and well-
funded marketing and sales operations. 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. 

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

Because we have limited financial and managerial resources, we focus on research programs and product candidates that we identify for specific 

indications. As a result, we may forego or delay pursuit of opportunities with other product candidates or for other indications that later prove to have 
greater commercial potential. Our resource allocation decisions may cause us to fail to timely capitalize on viable commercial products or profitable market 
opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any 
commercially viable products. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may 
relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements in cases in which it would have been 
more advantageous for us to retain sole development and commercialization rights to such product candidate. 

We have entered into a collaboration with Acadia Pharmaceuticals and may, in the future, seek to enter into collaborations with other third parties for 
the discovery, development and commercialization of our product candidates. If our collaborators cease development efforts under our collaboration 
agreements, or if any of those agreements are terminated, these collaborations may fail to lead to commercial products and we may never receive 
milestone payments or future royalties under these agreements.

We have entered into a collaboration with Acadia Pharmaceuticals to discover or develop certain novel RNA-based medicines for the potential 
treatment of severe and rare genetic neurodevelopmental diseases of the central nervous system (“CNS”). The collaboration includes SYNGAP1 syndrome, 
Rett syndrome (MECP2), and an undisclosed neurodevelopmental target of mutual interest, and such collaboration could represent a significant portion of 
our product pipeline. We may derive a significant portion of our future revenue from these agreements or other similar agreements into which we may enter 
in the future. Revenue from research and development collaborations depends upon continuation of the collaborations, payments for research and 
development services and resulting options to acquire any licenses of successful product candidates, and the achievement of milestones, contingent 
payments and royalties, if any, derived from future products developed from our research.

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Collaborations involving our product candidates currently pose, and will continue to pose, the following risks to us:

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

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

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

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

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

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 litigation or potential 
liability;

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

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

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

As a result of the foregoing, our current and any future collaboration agreements may not lead to development or commercialization of our product 

candidates in the most efficient manner or at all. If a collaborator of ours were to be involved in a business combination, the continued pursuit and emphasis 
on our product development or commercialization program could be delayed, diminished or terminated. Any failure to successfully develop or 
commercialize our product candidates pursuant to our current or any future collaboration agreements could have a material and adverse effect on our 
business, financial condition, results of operations and prospects.

Moreover, to the extent that any of our existing or future collaborators were to terminate a collaboration agreement, we may be forced to 
independently develop these product candidates, including funding preclinical studies or clinical trials, assuming marketing and distribution costs and 
defending intellectual property rights, or, in certain instances, abandon product candidates altogether, any of which could result in a change to our business 
plan and have a material adverse effect on our business, financial condition, results of operations and prospects.

We may not be successful in finding strategic collaborators for continuing development of certain of our future product candidates or successfully 
commercializing or competing in the market for certain indications. 

In the future, we may decide to collaborate with non-profit organizations, universities, pharmaceutical and biotechnology companies for the 
development and potential commercialization of existing and new product candidates. We face significant competition in seeking appropriate collaborators. 
Whether we reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator’s resources and 
expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. Those factors may 
include the design or results of clinical trials, the likelihood of approval by the FDA or similar regulatory authorities outside the United States, the potential 
market for the subject product candidate, the costs and complexities of manufacturing and delivering such product candidate to patients, the potential of 
competing drugs, the existence of uncertainty with respect to our ownership of technology, which can exist if there is a challenge to such ownership without 
regard to the merits of the challenge and industry and market conditions generally. The collaborator may also consider alternative product candidates or 
technologies for similar indications that may be available to collaborate on and whether such a collaboration could be more attractive than the one with us 
for our product candidate. The terms of any additional collaborations or other arrangements 

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that we may establish may not be favorable to us. Collaborations are complex and time-consuming to negotiate and document. In addition, there have been 
a significant number of recent business combinations among large pharmaceutical companies that have resulted in a reduced number of potential future 
collaborators. 

We may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we are unable to do so, we may have to curtail the 

development of the product candidate for which we are seeking to collaborate, reduce or delay its development program or one or more of our other 
development programs, delay its potential commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and 
undertake development or commercialization activities at our own expense. If we elect to increase our expenditures to fund development or 
commercialization activities on our own, we may need to obtain additional capital, which may not be available to us on acceptable terms or at all. If we do 
not have sufficient funds, we may not be able to further develop our product candidates or bring them to market and generate product revenue. 

The success of any potential collaboration arrangements will depend heavily on the efforts and activities of our collaborators. Collaborators 
generally have significant discretion in determining the efforts and resources that they will apply to these collaborations. Disagreements between parties to 
a collaboration arrangement regarding clinical development and commercialization matters can lead to delays in the development process or 
commercializing the applicable product candidate and, in some cases, termination of such collaboration arrangements. These disagreements can be difficult 
to resolve if neither of the parties has final decision-making authority. Collaborations with pharmaceutical or biotechnology companies and other third 
parties often are terminated or allowed to expire by the other party. Any such termination or expiration would adversely affect us financially and could 
harm our business reputation. 

Risks Related to our Financial Position 

We have a history of operating losses, and we may not achieve or sustain profitability. We anticipate that we will continue to incur losses for the 
foreseeable future. If we fail to obtain additional funding to conduct our planned research and development effort, we could be forced to delay, reduce 
or eliminate our product development programs or commercial development efforts. 

We are an early-stage biotechnology company with a limited operating history on which to base your investment decision. Biotechnology product 

development is a highly speculative undertaking and involves a substantial degree of risk. Our operations to date have been limited primarily to organizing 
and staffing our company, business planning, raising capital, acquiring and developing product and technology rights, manufacturing, and conducting 
research and development activities for our product candidates. We have never generated any revenue from product sales. We have not obtained regulatory 
approvals for any of our product candidates, and have funded our operations to date through proceeds from sales of our preferred stock and common stock. 

We have incurred net losses in each year since our inception. We incurred net losses of $104.7 million and $101.1 million, for the years ended 

December 31, 2023 and 2022, respectively. As of December 31, 2023, we had accumulated deficits of $401.8 million. Substantially all of our operating 
losses have resulted from costs incurred in connection with our research and development programs and from general and administrative costs associated 
with our operations. We expect to continue to incur significant expenses and operating losses over the next several years and for the foreseeable future as 
we intend to continue to conduct research and development, clinical testing, regulatory compliance activities, manufacturing activities, and, if any of our 
product candidates is approved, sales and marketing activities that, together with anticipated general and administrative expenses, will likely result in us 
incurring significant losses for the foreseeable future. Our prior losses, combined with expected future losses, have had and will continue to have an 
adverse effect on our stockholders’ equity and working capital. 

We expect that we will need to raise additional funding before we can expect to become profitable from any potential future sales of STK-001, STK-002 
or our future product candidates. This additional financing 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 our product development efforts or other operations. 

We will require substantial future capital in order to complete planned and future preclinical and clinical development for STK-001, STK-002 and 

other future product candidates, if any, and potentially commercialize these product candidates. Based upon our current operating plan, we believe that our 
cash, cash equivalents and marketable securities of $201.4 million as of December 31, 2023 will enable us to fund our operating expenses and capital 
expenditure requirements to the end of 2025. We expect our spending levels to increase in connection with our preclinical studies 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 
commercial launch, product sales, medical affairs, marketing, manufacturing and distribution. 

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Furthermore, we expect to incur additional costs associated with operating as a public company. 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 would be forced to delay, 
reduce or eliminate certain of our licensing activities, our research and development programs or other operations.

Additional capital might not be available when we need it and our actual cash requirements might be greater than anticipated. If we require 
additional capital at a time when investment in our industry or in the marketplace in general is limited, we might not be able to raise funding on favorable 
terms if at all. If we are not able to obtain financing on terms favorable to us, we may need to cease or reduce development or commercialization activities, 
sell some or all of our assets or merge with another entity, which could result in a loss of all or part of your investment.

Our future capital requirements will depend on many factors, including: 

•

•

•

•

•

•

•

•

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

the costs associated with the development of our internal manufacturing facility and processes; 

the costs related to the extent to which we enter into partnerships or other arrangements with third parties to further develop our product 
candidates; 

the costs and fees associated with the discovery, acquisition or in-license of product candidates or technologies; 

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

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

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

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

Our product candidates, if approved, may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of product 

candidates that we do not expect to be commercially available for many years, if at all. Accordingly, we will need to continue to rely on additional 
financing to achieve our business objectives, which may not be available to us on acceptable terms, or at all. 

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

We are a clinical stage biotechnology company formed in June 2014. Our operations to date have been limited to organizing and staffing our 
company, business planning, raising capital, acquiring our technology, identifying potential product candidates, undertaking research, preclinical and 
clinical development of our product candidates, manufacturing, and establishing licensing arrangements. We have not yet demonstrated the ability to 
complete clinical trials of our product candidates, obtain marketing approvals, manufacture a commercial scale product or conduct sales and marketing 
activities necessary for successful commercialization. Consequently, any predictions you make about our future success or viability may not be as accurate 
as they could be if we had a longer operating history. 

In addition, as a new business, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors. 
We will need to transition from a company with a licensing and research focus to a company that is also capable of supporting clinical development and 
commercial activities. We may not be successful in such a transition. 

Our ability to utilize our net operating loss carryforwards may be subject to limitations. 

We have incurred substantial losses during our history. We do not expect to be profitable soon and may never achieve profitability. As of December 
31, 2023, we had federal and state net operating loss carryforwards, or NOLs, of approximately $189.5 million and $199.4 million, respectively, and as of 
December 31, 2022, we had federal and state NOLs of approximately $210.9 million and $212.8 million, respectively. Our pre-2018 NOLs expire at 
various dates beginning in 2034. In general, NOLs generated in and after 2018 have no expiration. To the extent that we continue to generate NOLs, unused 
NOLs carry forward to offset future taxable income until such NOLs expire. Under Sections 382 and 383 of the Internal Revenue Code of 1986 ("IRC"), as 
amended, or the Code, if a corporation undergoes an “ownership change,” 

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generally defined as a greater than 50% change (by value) in its equity ownership over a three-year period, the corporation’s ability to use its pre-change 
NOLs and other pre-change tax attributes (such as research tax credits) to offset its post-change income may be limited. The Company recently performed 
an IRC 382 study and identified ownership changes in prior years. Based on existing Section 382 limitations, $0.9 million of the existing federal NOL will 
not be utilizable due to restrictive limitations. We may experience additional ownership changes in the future because of subsequent shifts in our stock 
ownership. As a result, our ability to use our pre-change NOLs to offset U.S. federal taxable income, if any, is subject to limitations, which could 
potentially result in increased future tax liability. In addition, at the state level, there may be periods during which the use of NOLs is suspended or 
otherwise limited, which could accelerate or permanently increase state taxes owed. 

U.S. federal income tax reform and changes in other tax laws could adversely affect us. 

In December 2017, U.S. federal tax legislation, commonly referred to as the Tax Cuts and Jobs Act (the “TCJA”) was signed into law, significantly 

reforming the Code. The TCJA, among other things, includes changes to U.S. federal tax rates, imposes significant additional limitations on the 
deductibility of business interest, allows for the expensing of capital expenditures, puts into effect the migration from a “worldwide” system of taxation to a 
partial “territorial” system, and modifies or repeals many business deductions and credits. Beginning in 2022, the TCJA also eliminated the option to 
immediately deduct research and development expenditures and required taxpayers to amortize domestic expenditures over five years and foreign 
expenditures over fifteen years.

We continue to examine the impact the TCJA may have on our business. The TCJA is a far-reaching and complex revision to the U.S. federal 
income tax laws with disparate and, in some cases, countervailing impacts on different categories of taxpayers and industries, and will require subsequent 
rulemaking and interpretation in a number of areas. The long-term impact of the TCJA on the overall economy, the industries in which we operate and our 
and our partners’ businesses cannot be reliably predicted at this early stage of the new law’s implementation. There can be no assurance that the TCJA will 
not negatively impact our operating results, financial condition, and future business operations. The estimated impact of the TCJA is based on our 
management’s current knowledge and assumptions, following consultation with our tax advisors.

Because of our valuation allowance in the U.S., ongoing tax effects of the Act are not expected to materially change our effective tax rate in future 

periods. 

Risks Related to our Intellectual Property 

Our success depends in part on our ability to obtain, maintain and protect our intellectual property. It is difficult and costly to protect our proprietary 
rights and technology, and we may not be able to ensure their protection. 

Our commercial success will depend in large part on obtaining and maintaining patent, trademark, trade secret and other intellectual property 
protection of our proprietary technologies and product candidates, which include TANGO, STK-001, STK-002 and the additional gene targets identified by 
TANGO, their respective components, formulations, combination therapies, methods used to manufacture them and methods of treatment, as well as 
successfully defending our patents and other intellectual property rights against third-party challenges. Our ability to stop unauthorized third parties from 
making, using, selling, offering to sell, importing or otherwise commercializing our product candidates is dependent upon the extent to which we have 
rights under valid and enforceable patents or trade secrets that cover these activities. If we are unable to secure and maintain patent protection for any 
product or technology we develop, or if the scope of the patent protection secured is not sufficiently broad, our competitors could develop and 
commercialize products and technology similar or identical to ours, and our ability to commercialize any product candidates we may develop may be 
adversely affected. The patenting process is expensive and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent 
applications at a reasonable cost or in a timely manner. In addition, we may not pursue or obtain patent protection in all relevant markets. 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. Moreover, in some 
circumstances, we may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain the patents, covering 
technology that we license from or license to third parties and are reliant on our licensors or licensees to do so. Our pending and future patent applications 
may not result in issued patents. Even if patent applications we license or own currently or in the future 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. Any patents that we hold or in-license may be challenged, narrowed, circumvented, or invalidated by third parties. Consequently, 
we do not know whether any of our platform advances and product candidates will be protectable or remain protected by valid and enforceable patents. In 
addition, our existing patents and any future patents we obtain may not be sufficiently broad to prevent others from using our technology or from 
developing competing products and technologies. 

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We depend on intellectual property licensed from third parties, and our licensors may not always act in our best interest. If we fail to comply with our 
obligations under our intellectual property licenses, if the licenses are terminated, or if disputes regarding these licenses arise, we could lose significant 
rights that are important to our business. 

We are dependent on patents, know-how and proprietary technology licensed from others. Our licenses to such patents, know-how and proprietary 

technology may not provide exclusive rights in all relevant fields of use and in all territories in which we may wish to develop or commercialize our 
products in the future. The agreements under which we license patents, know-how and proprietary technology from others are complex, and certain 
provisions in such agreements may be susceptible to multiple interpretations. 

For example, we are a party to a license agreement with the University of Southampton, pursuant to which we in-license key patents and patent 

applications for our TANGO platform, STK-001, STK-002 and our future product candidates. For more information regarding the agreement, please see 
“Business—License and research agreements.” The agreement imposes various diligence, milestone payment, royalty, insurance and other obligations on 
us. If we fail to comply with these obligations, our licensor may have the right to terminate our license, in which event we would not be able to develop or 
market our TANGO platform, STK-001, STK-002 or any other technology or product candidates covered by the intellectual property licensed under the 
agreement. In addition, we may need to obtain additional licenses from our existing licensor and others to advance our research or allow commercialization 
of product candidates we may develop. It is possible that we may be unable to obtain any additional licenses at a reasonable cost or on reasonable terms, if 
at all. In either event, we may be required to expend significant time and resources to redesign our technology, 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 develop or commercialize the affected technology or product candidates. 

If we or our existing or future licensors fail to adequately protect our licensed intellectual property, our ability to commercialize product candidates 
could suffer. We do not have complete control over the maintenance, prosecution and litigation of our in-licensed patents and patent applications and may 
have limited control over future intellectual property that may be in-licensed. For example, we cannot be certain that activities such as the maintenance and 
prosecution by our existing or future licensors have been or will be conducted in compliance with applicable laws and regulations or will result in valid and 
enforceable patents and other intellectual property rights. It is possible that our existing or future licensors’ infringement proceedings or defense activities 
may be less vigorous than had we conducted them ourselves, or may not be conducted in accordance with our best interests. 

Furthermore, inventions contained within some of our existing or future in-licensed patents and patent applications may be made using U.S. 

government funding or other non-governmental funding. We rely on our existing or future licensors to ensure compliance with applicable obligations 
arising from such funding, such as timely reporting, an obligation associated with in-licensed patents and patent applications. The failure of our existing or 
future licensors to meet their obligations may lead to a loss of rights or the unenforceability of relevant patents. For example, the government could have 
certain rights in such in-licensed patents, including a non-exclusive license authorizing the government to use the invention or to have others use the 
invention on its behalf for non-commercial purposes. If the U.S. government then decides to exercise these rights, it is not required to engage us as its 
contractor in connection with doing so. These rights may also permit the government to exercise march-in rights to use or allow third parties to use the 
technology covered by such in-licensed patents. The government may also exercise its march-in rights if it determines that action is necessary because we 
or our licensors failed 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 in-licensed government-funded inventions 
may be subject to certain requirements to manufacture products embodying such inventions in the United States. Any of the foregoing could harm our 
business, financial condition, results of operations, and prospects significantly. 

In addition, 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 patents, know-how and proprietary technology, or increase what we believe to be our financial or other obligations under the relevant 
agreement. Disputes that may arise between us and our existing or future licensors regarding intellectual property subject to a license agreement could 
include disputes regarding: 

•

•

•

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

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

our right to sublicense patent and other rights to third parties under collaborative development relationships; 

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•

•

our diligence obligations with respect to the use of the licensed technology in relation to our development and commercialization of our 
product candidates and what activities satisfy those diligence obligations; and 

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

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 technology or product candidates. As a result, any termination 
of or disputes over our intellectual property licenses could result in the loss of our ability to develop and commercialize our TANGO platform, STK-001, or 
STK-002, or we could lose other significant rights, any of which could have a material adverse effect on our business, financial condition, results of 
operations, and prospects. 

Moreover, our agreements with certain of our third-party research partners provide that improvements developed in the course of our relationship 

may be owned solely by either us or our third-party research partner, or jointly between us and the third party. If we determine that rights to such 
improvements owned solely by a research partner or other third party with whom we collaborate are necessary to commercialize our drug candidates or 
maintain our competitive advantage, we may need to obtain a license from such third party in order to use the improvements and continue developing, 
manufacturing or marketing our drug candidates. We may not be able to obtain such a license on an exclusive basis, on commercially reasonable terms, or 
at all, which could prevent us from commercializing our drug candidates or allow our competitors or others the chance to access technology that is 
important to our business. We also may need the cooperation of any co-owners of our intellectual property in order to enforce such intellectual property 
against third parties, and such cooperation may not be provided to us.

Our owned and in-licensed patents and patent applications may not provide sufficient protection of our TANGO platform, our STK-001 and STK-002 
product candidates, and our future product candidates or result in any competitive advantage. 

We own an issued U.S. patent covering STK-001 and related compositions, an issued U.S. patent covering the mechanism of action of STK-001 and 
use of STK-001 for treating diseases, and a pending PCT international application and five pending U.S. patent applications covering STK-001 and related 
compositions, and use of STK-001 for treating diseases. We have also in-licensed two issued U.S. patents and at least six issued foreign patents that cover 
the mechanism of action of STK-001, use of the mechanism for treating diseases, and related compositions. We have obtained at least fifteen issued foreign 
patents covering STK-001, related compositions and its uses and are currently pursuing patent protection for STK-001, related compositions, and its uses in 
several economically significant countries. With respect to STK-002, we have applied for and are currently pursuing patent protection for the mechanism of 
action, compositions related to STK-002, and uses of those compositions in several economically significant countries. We own an issued U.S. patent and 
an issued foreign patent covering STK-002 and related compositions. We also own a pending PCT international application and numerous pending U.S. 
and foreign patent applications covering STK-002 and related compositions, mechanism of action and use of STK-002 for treating diseases. Furthermore, 
our in-licensed issued U.S. patents and foreign patents (mentioned above) cover the mechanism of action of STK-002. We cannot be certain that any of 
these pending patent applications will issue as patents, and if they do, that such patents will cover or adequately protect STK-001, STK-002 and other 
programs or that such patents will not be challenged, narrowed, circumvented, invalidated or held unenforceable. 

In addition to claims directed toward the technology underlying our TANGO platform, our owned and in-licensed patents and patent applications 
contain claims directed to compositions of matter on the active pharmaceutical ingredients (“APIs”) in our product candidates, as well as methods-of-use 
directed to the use of an API for a specified treatment. Composition-of-matter patents on the active pharmaceutical ingredient in prescription drug products 
provide protection without regard to any particular method of use of the API used. Method-of-use patents do not prevent a competitor or other third party 
from developing or marketing an identical product for an indication that is outside the scope of the patented method. Moreover, with respect to method-of-
use patents, even if competitors or other third parties do not actively promote their product for our targeted indications or uses for which we may obtain 
patents, providers may recommend that patients use these products off-label, or patients may do so themselves. Although off-label use may infringe or 
contribute to the infringement of method-of-use patents, the practice is common and this type of infringement is difficult to prevent or prosecute. 

The strength of patents in the biotechnology and pharmaceutical field involves complex legal and scientific questions and can be uncertain. The 

patent applications that we own or in-license may fail to result in issued patents with claims that cover our product candidates or uses thereof in the United 
States or in other foreign countries. For example, while our patent applications are pending, we may be subject to a third party preissuance submission of 
prior art to the United States Patent and Trademark Office (the “USPTO”) or become involved in interference or derivation proceedings, or equivalent 
proceedings in foreign jurisdictions. Even if patents do successfully issue, third parties may challenge their inventorship, 

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validity, enforceability or scope, including through opposition, revocation, reexamination, post-grant and inter partes review proceedings. An adverse 
determination in any such submission, proceeding or litigation may result in loss of patent rights, 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. Furthermore, even if they are unchallenged, our patents and patent 
applications may not adequately protect our intellectual property or prevent others from designing around our claims. Moreover, some of our owned and in-
licensed patents and patent applications may be co-owned with third parties. If we are unable to obtain an exclusive license to any such third-party co-
owners’ interest in such patents or patent applications, such co-owners may be able to license their rights to other third parties, including our competitors, 
and our competitors could market competing products and technology. In addition, we may need the cooperation of any such co-owners of our patents in 
order to enforce such patents against third parties, and such cooperation may not be provided to us. If the breadth or strength of protection provided by the 
patent applications we hold with respect to our product candidates is threatened, it could dissuade companies from collaborating with us to develop, and 
threaten our ability to commercialize, our product candidates. Further, if we encounter delays in development, testing, and regulatory review of new 
product candidates, the period of time during which we could market our product candidates under patent protection would be reduced. 

Since patent applications in the United States and other countries are confidential for a period of time after filing, at any moment in time, we cannot 

be certain that we were in the past or will be in the future the first to file any patent application related to our product candidates. In addition, some patent 
applications in the United States may be maintained in secrecy until the patents are issued. As a result, there may be prior art of which we are not aware 
that may affect the validity or enforceability of a patent claim, and we may be subject to priority disputes. We may be required to disclaim part or all of the 
term of certain patents or all of the term of certain patent applications. There may be prior art of which we are not aware that may affect the validity or 
enforceability of a patent claim. There also may be prior art of which we are aware, but which we do not believe affects the validity or enforceability of a 
claim, which may, nonetheless, ultimately be found to affect the validity or enforceability of a claim. No assurance can be given that, if challenged, our 
patents would be declared by a court, patent office or other governmental authority to be valid or enforceable or that even if found valid and enforceable, a 
competitor’s technology or product would be found by a court to infringe our patents. We may analyze patents or patent applications of our competitors that 
we believe are relevant to our activities, and consider that we are free to operate in relation to our product candidates, but our competitors may achieve 
issued claims, including in patents we consider to be unrelated, that block our efforts or potentially result in our product candidates or our activities 
infringing such claims. It is possible that our competitors may have filed, and may in the future file, patent applications covering our products or 
technology similar to ours. Those patent applications may have priority over our owned and in-licensed patent applications or patents, which could require 
us to obtain rights to issued patents covering such technologies. The possibility also exists that others will develop products that have the same effect as our 
product candidates on an independent basis that do not infringe our patents or other intellectual property rights, or will design around the claims of patents 
that we have had issued that cover our product candidates. 

Likewise, our currently owned and in-licensed patents and patent applications, if issued as patents, directed to our proprietary technologies and our 

product candidates are expected to expire from 2035 through 2044, without taking into account any possible patent term adjustments or extensions. Our 
earliest in-licensed patents may expire before, or soon after, our first product achieves marketing approval in the United States or foreign jurisdictions. 
Additionally, we cannot be assured that the USPTO or relevant foreign patent offices will grant any of the pending patent applications we own or in-license 
currently or in the future. Upon the expiration of our current patents, we may lose the right to exclude others from practicing these inventions. The 
expiration of these patents could also have a similar material adverse effect on our business, financial condition, results of operations and prospects. 

The degree of future protection for our proprietary rights is uncertain because legal means afford only limited protection and may not adequately 

protect our rights or permit us to gain or keep our competitive advantage. For example: 

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•

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others may be able to make or use compounds that are similar to the active compositions of our product candidates but that are not covered 
by the claims of our patents; 

the active pharmaceutical ingredients in our current product candidates will eventually become commercially available in generic drug 
products, and no patent protection may be available with regard to formulation or method of use; 

we or our licensors, as the case may be, may fail to meet our obligations to the U.S. government regarding any in-licensed patents and patent 
applications funded by U.S. government grants, leading to the loss or unenforceability of patent rights; 

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•

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we or our licensors, as the case may be, might not have been the first to file patent applications for certain inventions; 

others may independently develop similar or alternative technologies or duplicate any of our technologies; 

it is possible that our pending patent applications will not result in issued patents; 

it is possible that there are prior public disclosures that could invalidate our owned or in-licensed patents, as the case may be, or parts of our 
owned or in-licensed patents; 

it is possible that others may circumvent our owned or in-licensed patents; 

it is possible that there are unpublished applications or patent applications maintained in secrecy that may later issue with claims covering our 
product candidates or technology similar to ours; 

the laws of foreign countries may not protect our or our licensors’, as the case may be, proprietary rights to the same extent as the laws of the 
United States; 

the claims of our owned or in-licensed issued patents or patent applications, if and when issued, may not cover our product candidates; 

our owned or in-licensed issued patents may not provide us with any competitive advantages, may be narrowed in scope, or be held invalid or 
unenforceable as a result of legal challenges by third parties; 

the inventors of our owned or in-licensed patents or patent applications may become involved with competitors, develop products or 
processes that design around our patents, or become hostile to us or the patents or patent applications on which they are named as inventors; 

it is possible that our owned or in-licensed patents or patent applications omit individual(s) that should be listed as inventor(s) or include 
individual(s) that should not be listed as inventor(s), which may cause these patents or patents issuing from these patent applications to be 
held invalid or unenforceable; 

we have engaged in scientific collaborations in the past and will continue to do so in the future and our collaborators may develop adjacent or 
competing products that are outside the scope of our patents; 

we may not develop additional proprietary technologies for which we can obtain patent protection; 

it is possible that product candidates or diagnostic tests we develop may be covered by third parties’ patents or other exclusive rights; or 

the patents of others may have an adverse effect on our business. 

Any of the foregoing could have a material adverse effect on our business, financial conditions, results of operations and prospects. 

Our strategy of obtaining rights to key technologies through in-licenses may not be successful. 

We seek to expand our product candidate pipeline in part by in-licensing the rights to key technologies, including those related to specific gene 

targets which may be upregulated by TANGO. The future growth of our business will depend in part on our ability to in-license or otherwise acquire the 
rights to additional product candidates and technologies. Although we have succeeded in licensing technologies from the University of Southampton in the 
past, we cannot assure you that we will be able to in-license or acquire the rights to any product candidates or technologies from third parties on acceptable 
terms or at all. 

For example, our agreements with certain of our third-party research partners provide that improvements developed in the course of our relationship 
may be owned solely by either us or our third-party research partner, or jointly between us and the third party. If we determine that exclusive rights to such 
improvements owned solely by a research partner or other third party with whom we collaborate are necessary to commercialize our drug candidates or 
maintain our competitive advantage, we may need to obtain an exclusive license from such third party in order to use the improvements and continue 
developing, manufacturing or marketing our drug candidates. We may not be able to obtain such a license on an exclusive basis, on commercially 
reasonable terms, or at all, which could prevent us from commercializing our drug candidates or allow our competitors or others the opportunity to access 
technology that is important to our business. We also may need the cooperation of any co-owners of our intellectual property in order to enforce such 
intellectual property against third parties, and such cooperation may not be provided to us. 

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In addition, the in-licensing and acquisition of these technologies is a highly competitive area, and a number of more established companies are also 

pursuing strategies to license or acquire product candidates or technologies that we may consider attractive. These established companies may have a 
competitive advantage over us due to their size, cash 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. Furthermore, we may be unable to identify suitable product candidates or 
technologies within our area of focus. If we are unable to successfully obtain rights to suitable product candidates or technologies, our business and 
prospects could be materially and adversely affected. 

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

In addition to patent protection, we rely upon know-how and trade secret protection, as well as non-disclosure agreements and invention assignment 

agreements with our employees, consultants and third-parties, to protect our confidential and proprietary information, especially where we do not believe 
patent protection is appropriate or obtainable. 

It is our policy to require our employees, consultants, outside scientific collaborators, sponsored researchers and other advisors to execute 
confidentiality agreements upon the commencement of employment or consulting relationships with us. These agreements provide that all confidential 
information concerning our business or financial affairs developed or made known to the individual or entity during the course of the party’s relationship 
with us is to be kept confidential and not disclosed to third parties, except in certain specified circumstances. In the case of employees, the agreements 
provide that all inventions conceived by the individual, and that are related to our current or planned business or research and development or made during 
normal working hours, on our premises or using our equipment or proprietary information, are our exclusive property. In the case of consultants and other 
third parties, the agreements provide that all inventions conceived in connection with the services provided are our exclusive property. However, 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 have also adopted policies and conduct training that provides guidance on our expectations, and our advice for best practices, in protecting 
our trade secrets. Despite these efforts, any of these parties may breach the agreements and disclose our proprietary information, including our trade secrets, 
and we may not be able to obtain adequate remedies for such breaches. 

In addition to contractual measures, we try to protect the confidential nature of our proprietary information through other appropriate precautions, 

such as physical and technological security measures. However, trade secrets and know-how can be difficult to protect. These measures may not, for 
example, in the case of misappropriation of a trade secret by an employee or third party with authorized access, provide adequate protection for our 
proprietary information. Our security measures may not prevent an employee or consultant from misappropriating our trade secrets and providing them to a 
competitor, and any recourse we might take against this type of misconduct may not provide an adequate remedy to protect our interests fully. Enforcing a 
claim that a party illegally disclosed or misappropriated a trade secret can be difficult, expensive, and time-consuming, and the outcome is unpredictable. In 
addition, trade secrets may be independently developed by others in a manner that could prevent us from receiving legal recourse. If any of our confidential 
or proprietary information, such as our trade secrets, were to be disclosed or misappropriated, or if any of that information was independently developed by 
a competitor, our competitive position could be harmed. 

In addition, courts outside the United States are sometimes less willing to protect trade secrets. If we choose to go to court to stop a third party from 
using any of our trade secrets, we may incur substantial costs. Even if we are successful, these types of lawsuits may consume our time and other resources. 
Although we take steps to protect our proprietary information and trade secrets, third parties may independently develop substantially equivalent 
proprietary information and techniques or otherwise gain access to our trade secrets or disclose our technology. As a result, we may not be able to 
meaningfully protect our trade secrets. Any of the foregoing could have a material adverse effect on our business, financial condition, results of operations 
and prospects. 

Third-party claims of intellectual property infringement may prevent, delay or otherwise interfere with our product discovery and development efforts.

Our commercial success depends in part on our ability to develop, manufacture, market and sell our product candidates and use our proprietary 
technologies without infringing, misappropriating or otherwise violating the intellectual property or proprietary rights of third parties. There is a substantial 
amount of litigation involving patents and other intellectual property rights in the biotechnology and pharmaceutical industries, as well as administrative 
proceedings for challenging patents, including interference, derivation, inter partes review, post grant review, and reexamination proceedings before the 
USPTO or oppositions and other comparable proceedings in foreign jurisdictions. We may be exposed to, or threatened with, future litigation by third 
parties having patent or other intellectual property rights alleging that our product candidates and/or proprietary technologies infringe, misappropriate or 
otherwise violate their intellectual property rights. Numerous U.S. and 

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foreign issued patents and pending patent applications that are owned by third parties, such as Ionis Pharmaceuticals, exist in the fields in which we are 
developing our product candidates. As the biotechnology and pharmaceutical industries expand and more patents are issued, the risk increases that our 
product candidates may give rise to claims of infringement of the patent rights of others. Moreover, it is not always clear to industry participants, including 
us, which patents cover various types of drugs, products or their methods of use or manufacture. Thus, because of the large number of patents issued and 
patent applications filed in our field, third parties may allege they have patent rights encompassing our product candidates, technologies or methods. 

If a third party claims that we infringe, misappropriate or otherwise violate its intellectual property rights, we may face a number of issues, 

including, but not limited to: 

•

•

•

•

•

•

infringement and other intellectual property claims that, regardless of merit, may be expensive and time-consuming to litigate and may divert 
our management’s attention from our core business; 

substantial damages for infringement, which we may have to pay if a court decides that the product candidate or technology at issue infringes 
on or violates the third party’s rights, and, if the court finds that the infringement was willful, we could be ordered to pay treble damages plus 
the patent owner’s attorneys’ fees;

a court prohibiting us from developing, manufacturing, marketing or selling our product candidates, or from using our proprietary 
technologies, unless the third party licenses its product rights to us, which it is not required to do, on commercially reasonable terms or at all; 

if a license is available from a third party, we may have to pay substantial royalties, upfront fees and other amounts, and/or grant cross-
licenses to intellectual property rights for our product candidates; 

the requirement that we redesign our product candidates or processes so they do not infringe, which may not be possible or may require 
substantial monetary expenditures and time; and 

there could be public announcements of the results of hearings, motions, or other interim proceedings or developments, and if securities 
analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock. 

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially 
greater resources. In addition, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our 
ability to raise the funds necessary to continue our operations or could otherwise have a material adverse effect on our business, financial condition, results 
of operations and prospects. 

Third parties may assert that we are employing their proprietary technology without authorization, including by enforcing its patents against us by 

filing a patent infringement lawsuit against us. In this regard, patents issued in the United States by law enjoy a presumption of validity that can be rebutted 
only with evidence that is “clear and convincing,” a heightened standard of proof. 

There may be third-party patents of which we are currently unaware with claims to materials, formulations, methods of manufacture or methods for 

treatment related to the use or manufacture of our product candidates. Because patent applications can take many years to issue, there may be currently 
pending patent applications that may later result in issued patents that our product candidates may infringe. In addition, third parties may obtain patents in 
the future and claim that use of our technologies infringes upon these patents. 

If any third-party patents were held by a court of competent jurisdiction to cover the manufacturing process of our product candidates, or materials 

used in or formed during the manufacturing process, or any final product itself, the holders of those patents may be able to block our ability to 
commercialize our product candidate unless we obtain a license under the applicable patents, or until those patents were to expire or those patents are 
finally determined to be invalid or unenforceable. Similarly, if any third-party patent were held by a court of competent jurisdiction to cover aspects of our 
formulations, processes for manufacture or methods of use, including combination therapy or patient selection methods, the holders of that patent may be 
able to block our ability to develop and commercialize the product candidate unless we obtain a license or until such patent expires or is finally determined 
to be invalid or unenforceable. In either case, a license may not be available on commercially reasonable terms, or at all, particularly if such patent is 
owned or controlled by one of our primary competitors. If we are unable to obtain a necessary license to a third-party patent on commercially reasonable 
terms, or at all, our ability to commercialize our product candidates may be impaired or delayed, which could significantly harm our business. Even if we 
obtain a license, it may be non-exclusive, thereby giving our competitors access to the same technologies licensed to us. In addition, if the breadth or 
strength of protection provided by our patents and patent applications is threatened, it could dissuade companies from collaborating with us to license, 
develop or commercialize current or future product candidates. 

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Parties making claims against us may seek and obtain injunctive or other equitable relief, which could effectively block our ability to further 

develop and commercialize our product candidates. Defense of these claims, regardless of their merit, would involve substantial litigation expense and 
would be a substantial diversion of employee time and resources from our business. In the event of a successful claim of infringement against us, we may 
have to pay substantial damages, including treble damages and attorneys’ fees for willful infringement, obtain one or more licenses from third parties, pay 
royalties or redesign our infringing products, which may be impossible or require substantial time and monetary expenditure. We cannot predict whether 
any license of this nature would be available at all or whether it would be available on commercially reasonable terms. Furthermore, even in the absence of 
litigation, we may need to obtain licenses from third parties to advance our research or allow commercialization of our product candidates and we may fail 
to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we would be unable to further develop and commercialize 
our product candidates, which could significantly harm our business. 

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time-consuming and 
unsuccessful and could result in a finding that such patents are unenforceable or invalid. 

Competitors may infringe our patents or the patents of our licensors. To counter infringement or unauthorized use, we may be required to file 
infringement claims, which can be expensive and time-consuming. In addition, in an infringement proceeding, a court may decide that one or more of our 
patents is not valid or is unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover 
the technology in question. 

In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace, and there are 
numerous grounds upon which a third party can assert invalidity or unenforceability of a patent. Third parties may also raise similar claims before 
administrative bodies in the United States or abroad, even outside the context of litigation. These types of mechanisms include re-examination, post-grant 
review, inter partes review, interference proceedings, derivation proceedings, and equivalent proceedings in foreign jurisdictions (e.g., opposition 
proceedings). These types of proceedings could result in revocation or amendment to our patents such that they no longer cover our product candidates. 
The outcome for any particular patent following legal assertions of invalidity and unenforceability is unpredictable. With respect to the validity question, 
for example, we cannot be certain that there is no invalidating prior art, of which we, our patent counsel and the patent examiner were unaware during 
prosecution. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, or if we are otherwise unable to adequately protect our 
rights, we would lose at least part, and perhaps all, of the patent protection on our product candidates. Defense of these types of claims, regardless of their 
merit, would involve substantial litigation expense and would be a substantial diversion of employee resources from our business. 

Conversely, we may choose to challenge the patentability of claims in a third party’s U.S. patent by requesting that the USPTO review the patent 
claims in re-examination, post-grant review, inter partes review, interference proceedings, derivation proceedings, and equivalent proceedings in foreign 
jurisdictions (e.g., opposition proceedings), or we may choose to challenge a third party’s patent in patent opposition proceedings in the European Patent 
Office (the “EPO”) or another foreign patent office. Even if successful, the costs of these opposition proceedings could be substantial, and may consume 
our time or other resources. If we fail to obtain a favorable result at the USPTO, the EPO or other patent office then we may be exposed to litigation by a 
third party alleging that the patent may be infringed by our product candidates or proprietary technologies. 

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of 

our confidential information could be compromised by disclosure during this type of litigation. In addition, there could be public announcements of the 
results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, that 
perception could have a substantial adverse effect on the price of our common stock. Any of the foregoing could have a material adverse effect on our 
business financial condition, results of operations and prospects. 

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We have limited foreign intellectual property rights and may not be able to protect our intellectual property rights throughout the world. 

We have limited intellectual property rights outside the United States. Filing, prosecuting and defending patents on product candidates in all 
countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be 
less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as 
federal and state laws in the United States. Consequently, we may not be able to 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 where enforcement is not as strong as that in the United States. These products may compete 
with our product candidates in jurisdictions where we do not have any issued patents and our patent claims or other intellectual property rights may not be 
effective or sufficient to prevent them from 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 biopharmaceutical products, which could make it difficult for us to stop the infringement of our patents or 
marketing of competing products against third parties in violation of our proprietary rights generally. The initiation of proceedings by third parties to 
challenge the scope or validity of our patent rights in foreign jurisdictions could result in substantial cost and divert our efforts and attention from other 
aspects of our business. 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.

Geopolitical actions in the United States and in foreign countries could increase the uncertainties and costs surrounding the prosecution or 
maintenance of our patent applications or those of any current or future licensors and the maintenance, enforcement or defense of our issued patents or 
those of any current or future licensors. For example, the United States and foreign government actions related to Russia’s invasion of Ukraine may limit or 
prevent filing, prosecution and maintenance of patent applications in Russia. Government actions may also prevent maintenance of issued patents in 
Russia. These actions could result in abandonment or lapse of our patents or patent applications, resulting in partial or complete loss of patent rights in 
Russia. In addition, a decree was adopted by the Russian government in March 2022, allowing Russian companies and individuals to exploit inventions 
owned by patentees that have citizenship or nationality in, are registered in, or have predominately primary place of business or profit-making activities in 
the United States and other countries that Russia has deemed unfriendly without consent or compensation. Consequently, we would not be able to prevent 
third parties from practicing our inventions in Russia or from selling or importing products made using our inventions in and into Russia. Similarly, the 
ongoing conflict in Israel could result in regulatory delays or the inability to secure intellectual property or commercialize our products there. Accordingly, 
our competitive position may be impaired, and our business, financial condition, results of operations and prospects may be adversely affected.

Our use of open source software could impose limitations on our ability to commercialize our product candidates. 

Our use of open source software could impose limitations on our ability to commercialize our product candidates. Our technology utilizes open 

source software that contains modules licensed for use from third-party authors under open source licenses. In particular, some of the software that powers 
TANGO may be provided under license arrangements that allow use of the software for research or other non-commercial purposes. As a result, in the 
future, as we seek to use our platform in connection with commercially available products, we may be required to license that software under different 
license terms, which may not be possible on commercially reasonable terms, if at all. If we are unable to license software components on terms that permit 
its use for commercial purposes, we may be required to replace those software components, which could result in delays, additional cost and additional 
regulatory approvals. 

Use and distribution of open source software may entail greater risks than use of third-party commercial software, as open source licensors generally 

do not provide warranties or other contractual protections regarding infringement claims or the quality of the software code. Some open source licenses 
contain requirements that we make available source code for modifications or derivative works we create based upon the type of open source software we 
use. If we combine our proprietary software with open source software in a certain manner, we could, under certain of the open source licenses, be required 
to release the source code of our proprietary software to the public. This could allow our competitors to create similar products with lower development 
effort and time, and ultimately could result in a loss of product sales for us. Although we monitor our use of open source software, the terms of many open 
source licenses have not been interpreted by 

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U.S. courts, and there is a risk that those licenses could be construed in a manner that could impose unanticipated conditions or restrictions on our ability to 
commercialize our product candidates. We could be required to seek licenses from third parties in order to continue offering our product candidates, to re-
engineer our product candidates or to discontinue the sale of our product candidates in the event re-engineering cannot be accomplished on a timely basis, 
any of which could materially and adversely affect our business, financial condition, results of operations and prospects. 

Third parties may assert that our employees or consultants have wrongfully used or disclosed confidential information or misappropriated trade 
secrets. 

As is common in the biotechnology and pharmaceutical industries, we employ individuals who were previously employed at universities or other 

biopharmaceutical or pharmaceutical companies, including our competitors or potential competitors. Although no misappropriation or improper disclosure 
claims against us are currently pending, and although we try to ensure that our employees and consultants do not use the proprietary information or know-
how of others in their work for us, we may be subject to claims that we or our employees, consultants or independent contractors have inadvertently or 
otherwise used or disclosed intellectual property, including trade secrets or other proprietary information, of a former employer or other third parties. We 
may then have to pursue litigation to defend against these claims. If we fail in defending any claims of this nature in addition to paying monetary damages, 
we may lose valuable intellectual property rights or personnel. Even if we are successful in defending against these types of claims, 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, that perception could have a substantial adverse effect on the 
price of our common stock. This type of litigation or proceeding could substantially increase our operating losses and reduce our resources available for 
development activities, and we may not have sufficient financial or other resources to adequately conduct this type of litigation or proceedings. For 
example, some of our competitors may be able to sustain the costs of this type of litigation or proceedings more effectively than we can because of their 
substantially greater financial resources. In any case, uncertainties resulting from the initiation and continuation of intellectual property litigation or other 
intellectual property related proceedings could adversely affect our ability to compete in the marketplace. 

We may not be successful in obtaining or maintaining necessary rights to product components and processes for our development pipeline through 
acquisitions and in-licenses.

The growth of our business may depend in part on our ability to acquire, in-license or use third-party proprietary rights. For example, our product 
candidates may require specific formulations to work effectively and efficiently, we may develop product candidates containing our compounds and pre-
existing pharmaceutical compounds, or we may be required by the FDA or comparable foreign regulatory authorities to provide a companion diagnostic 
test or tests with our product candidates, any of which could require us to obtain rights to use intellectual property held by third parties. In addition, with 
respect to any patents we may co-own with third parties, we may require licenses to such co-owners interest to such patents. We may be unable to acquire 
or in-license any compositions, methods of use, processes or other third-party intellectual property rights from third parties that we identify as necessary or 
important to our business operations. In addition, we may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. Were that 
to happen, we may need to cease use of the compositions or methods covered by those third-party intellectual property rights, and may need to seek to 
develop alternative approaches that do not infringe on those intellectual property rights, which may entail additional costs and development delays, even if 
we were able to develop such alternatives, which may not be feasible. Even if we are able to obtain a license, it may be non-exclusive, which means that 
our competitors may also receive access to the same technologies licensed to us. In that event, we may be required to expend significant time and resources 
to develop or license replacement technology. 

Additionally, we sometimes collaborate with academic institutions to accelerate our preclinical research or development under written agreements 

with these institutions. In certain cases, these institutions provide us with an option to negotiate a license to any of the institution’s rights in technology 
resulting from the collaboration. Even if we hold such an option, we may be unable to negotiate a license from the institution 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 others, potentially 
blocking our ability to pursue our program. 

The licensing and acquisition of third-party intellectual property rights is a competitive area, and companies that may be more established or have 

greater resources than we do may also be pursuing strategies to license or acquire third-party intellectual property rights that we may consider necessary or 
attractive in order to commercialize our product candidates. More established companies may have a competitive advantage over us due to their size, cash 
resources and greater clinical development and commercialization capabilities. In addition, companies that perceive us to be a competitor may be unwilling 

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to assign or license rights to us. There can be no assurance that we will be able to successfully complete these types of negotiations and ultimately acquire 
the rights to the intellectual property surrounding the additional product candidates that we may seek to develop or market. If we are unable to successfully 
obtain rights to required third-party intellectual property or to maintain the existing intellectual property rights we have, we may have to abandon 
development of certain programs and our business financial condition, results of operations and prospects could suffer. 

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

Periodic maintenance fees on any issued patent are due to be paid to the USPTO and foreign patent agencies in several stages over the lifetime of the 

patent. The USPTO and various foreign patent agencies also require compliance with a number of procedural, documentary, fee payment and other 
provisions during the patent application process and following the issuance of a patent. While an inadvertent lapse can in many cases be cured by payment 
of a late fee or by other means in accordance with the applicable rules, there are situations in which noncompliance can result in abandonment or lapse of 
the patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. Noncompliance events that could result in 
abandonment or lapse of a patent or patent application include, but are not limited to, failure to respond to official actions within prescribed time limits, 
non-payment of fees and failure to properly legalize and submit formal documents. Were a noncompliance event to occur, our competitors might be able to 
enter the market, which would have a material adverse effect on our business financial condition, results of operations and prospects. 

Changes in patent law in the United States and in non-U.S. jurisdictions could diminish the value of patents in general, thereby impairing our ability to 
protect our product candidates. 

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and 
enforcing patents in the biopharmaceutical industry involve both technological and legal complexity, and is therefore costly, time-consuming and inherently 
uncertain. 

Past or future patent reform legislation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the 

enforcement or defense of our issued patents. For example, in March 2013, under the Leahy-Smith America Invents Act (the “America Invents Act”) the 
United States moved from a “first to invent” to a “first-to-file” patent system. Under a “first-to-file” system, assuming the other requirements for 
patentability are met, the first inventor to file a patent application generally will be entitled to a patent on the invention regardless of whether another 
inventor had made the invention earlier. The America Invents Act includes a number of other significant changes to U.S. patent law, including provisions 
that affect the way patent applications are prosecuted, redefine prior art and establish a new post-grant review system. The effects of these changes are 
currently unclear as the USPTO continues to promulgate new regulations and procedures in connection with the America Invents Act and many of the 
substantive changes to patent law, including the “first-to-file” provisions, only became effective in March 2013. In addition, the courts have yet to address 
many of these provisions and the applicability of the act and new regulations on the specific patents discussed in this filing have not been determined and 
would need to be reviewed. However, the America Invents Act and its implementation could increase the uncertainties and costs surrounding the 
prosecution of our patent applications and the enforcement or defense of our issued patents. 

Additionally, recent U.S. Supreme Court rulings have narrowed the scope of patent protection available in certain circumstances and weakened the 
rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination 
of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts and 
the USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to 
enforce our existing patents and patents that we might obtain in the future. For example, in the case, Assoc. for Molecular Pathology v. Myriad Genetics, 
Inc., the U.S. Supreme Court held that certain claims to DNA molecules are not patentable. While we do not believe that any of our owned or in-licensed 
patents will be found invalid based on this decision, we cannot predict how future decisions by the courts, the U.S. Congress or the USPTO may impact the 
value of our patents. Any similar adverse changes in the patent laws of other jurisdictions could also have a material adverse effect on our business, 
financial condition, results of operations and prospects. 

Additionally, starting from June 1, 2023, European applications have the option, upon grant of a patent, of becoming a Unitary Patent which will be 
subject to the jurisdiction of the Unitary Patent Court (“UPC”). This is a significant change in European patent practice. As the UPC is a new court system, 
there is no precedent for the court, increasing the uncertainty of any litigation.

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

Patents have a limited lifespan. In the United States, if all maintenance fees are timely paid, the natural expiration of a patent is generally 20 years 

from its earliest U.S. non-provisional filing date. Various extensions may be available, but the life of a patent, and the protection it affords, is limited. Even 
if patents covering our product candidates are obtained, once the patent life has expired, we may be open to competition from competitive products, 
including generics. Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting our 
product candidates might expire before or shortly after we or our partners commercialize those candidates. As a result, our owned and licensed patent 
portfolio may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours. 

If we do not obtain patent term extension for any product candidates we may develop, our business may be materially harmed. 

Depending upon the timing, duration and specifics of any FDA marketing approval of any product candidates we may develop, one or more 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 (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 per product 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, even if we were to seek a patent term extension, it may not be granted because of, for example, the failure to 
exercise due diligence during the testing phase or regulatory review process, the failure to apply within applicable deadlines, the failure to apply prior to 
expiration of relevant patents, or any other failure 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 term of any such extension is less than we request, our 
competitors may obtain approval of competing products following our patent expiration, and our business, financial condition, results of operations, and 
prospects could be materially harmed. 

We are subject to a variety of privacy and data security laws, and our failure to comply with them could harm our business. 

We maintain a large quantity of sensitive information, including confidential business and patient health information in connection with our 
preclinical studies, and are subject to laws and regulations governing the privacy and security of such information. In the United States, there are numerous 
federal and state privacy and data security laws and regulations governing the collection, use, disclosure and protection of personal information, including 
federal and state health information privacy laws, federal and state security breach notification laws, and federal and state consumer protection laws. Each 
of these laws is subject to varying interpretations and constantly evolving. In May 2018, a new privacy regime, the General Data Protection Regulation (the 
“GDPR”) took effect in the European Economic Area (the “EEA”) and the United Kingdom. The GDPR governs the collection, use, disclosure, transfer or 
other processing of personal data of European and United Kingdom persons. The GDPR continues to form part of law in the United Kingdom with some 
amendments following Brexit (“UK GDPR”), although there is a risk of divergence in the future which may increase our overall data protection 
compliance cost. Among other things, the GDPR and UK GDPR impose new requirements regarding the security of personal data and notification of data 
processing obligations to the competent national data processing authorities, changes the lawful bases on which personal data can be processed, expands 
the definition of personal data and requires changes to informed consent practices, as well as more detailed notices for clinical trial subjects and 
investigators. In addition, the GDPR and UK GDPR increase the scrutiny of transfers of personal data from clinical trial sites located in the EEA and the 
United Kingdom to the United States and other jurisdictions that the European Commission or the United Kingdom do not recognize as having “adequate” 
data protection laws, and imposes substantial fines for breaches and violations (up to the greater of €20 million or 4% of our consolidated annual 
worldwide gross revenue). The GDPR and UK GDPR also confer a private right of action on data subjects and consumer associations to lodge complaints 
with supervisory authorities, seek judicial remedies and obtain compensation for damages resulting from violations of the GDPR or UK GDPR. 

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More recently, the SEC has enacted regulations requiring companies to disclose or otherwise provide notifications regarding data security breaches. 

For example, the SEC recently adopted cybersecurity risk management and disclosure rules, which require the disclosure of information pertaining to 
cybersecurity incidents and cybersecurity risk management, strategy and governance. Compliance with these and any other applicable privacy and data 
security laws and regulations is a rigorous and time-intensive process, and we may be required to put in place additional mechanisms ensuring compliance 
with the new data protection rules. If we fail to comply with any such laws or regulations, we may face significant fines and penalties that could adversely 
affect our business, financial condition and results of operations. Compliance with these and any other applicable privacy and data security laws and 
regulations is a rigorous and time-intensive process, and we may be required to put in place additional mechanisms ensuring compliance with the new data 
protection rules. If we fail to comply with any such laws or regulations, we may face significant fines and penalties that could adversely affect our business, 
financial condition and results of operations. 

Risks Related to Employee Matters, Managing Growth and Other Risks Related to our Business 

We expect to expand our development and regulatory capabilities, and as a result, we may encounter difficulties in managing our growth, which could 
disrupt our operations. 

We expect to experience significant growth in the number of our employees and the scope of our operations, particularly in the areas of product 

candidate development and growing our capability to conduct clinical trials. To manage our anticipated future growth, we must continue to implement and 
improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified personnel. Due to our 
limited financial resources and the limited experience of our management team in managing a company with such anticipated growth, we may not be able 
to effectively manage the expansion of our operations or recruit and train additional qualified personnel. The expansion of our operations may lead to 
significant costs and may divert our management and business development resources. Any inability to manage growth could delay the execution of our 
business plans or disrupt our operations. 

We must attract and retain highly skilled employees to succeed.

To succeed, we must recruit, retain, manage and motivate qualified clinical, scientific, technical and management personnel, and we face significant 

competition for experienced personnel. If we do not succeed in attracting and retaining qualified personnel, particularly at the management level, it could 
adversely affect our ability to execute our business plan, harm our results of operations and increase our capabilities to successfully commercialize STK-
001, STK-002 and our future product candidates. In particular, we believe that our future success is highly dependent upon the contributions of our senior 
management, including Edward M. Kaye, our Chief Executive Officer, as well as our senior scientists and other members of our senior management team. 
The loss of services of one or more of these individuals, who all have at-will employment arrangements with us, could delay or prevent the successful 
development of our product pipeline, completion of our planned clinical trials or the commercialization of our product candidates, if approved. The 
competition for qualified personnel in the biotechnology field is intense and as a result, we may be unable to continue to attract and retain qualified 
personnel necessary for the development of our business or to recruit suitable replacement personnel. 

Many of the other biotechnology companies that we compete against for qualified personnel have greater financial and other resources, different risk 

profiles and a longer history in the industry than we do. They also may provide more diverse opportunities and better chances for career advancement. 
Some of these characteristics may be more appealing to high-quality candidates than what we have to offer. If we are unable to continue to attract and 
retain high-quality personnel, the rate and success at which we can discover and develop product candidates and our business will be limited. 

Future acquisitions or strategic alliances could disrupt our business and harm our financial condition and results of operations. 

We may acquire additional businesses or drugs, form strategic alliances or create joint ventures with third parties that we believe will complement or 
augment our existing business. If we acquire businesses with promising markets or technologies, we may not be able to realize the benefit of acquiring such 
businesses if we are unable to successfully integrate them with our existing operations and company culture. We may encounter numerous difficulties in 
developing, manufacturing and marketing any new drugs resulting from a strategic alliance or acquisition that delay or prevent us from realizing their 
expected benefits or enhancing our business. We cannot assure you that, following any such acquisition, we will achieve the expected synergies to justify 
the transaction. The risks we face in connection with acquisitions, include: 

•

•

diversion of management time and focus from operating our business to addressing acquisition integration challenges; 

coordination of research and development efforts; 

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•

•

•

•

•

•

•

retention of key employees from the acquired company; 

changes in relationships with strategic partners as a result of product acquisitions or strategic positioning resulting from the acquisition; 

cultural challenges associated with integrating employees from the acquired company into our organization; 

the need to implement or improve controls, procedures, and policies at a business that prior to the acquisition may have lacked sufficiently 
effective controls, procedures and policies; 

liability for activities of the acquired company before the acquisition, including intellectual property infringement claims, violation of laws, 
commercial disputes, tax liabilities, and other known liabilities; 

unanticipated write-offs or charges; and 

litigation or other claims in connection with the acquired company, including claims from terminated employees, customers, former 
stockholders or other third parties. 

Our failure to address these risks or other problems encountered in connection with our past or future acquisitions or strategic alliances could cause 
us to fail to realize the anticipated benefits of these transactions, cause us to incur unanticipated liabilities and harm the business generally. There is also a 
risk that future acquisitions will result in the incurrence of debt, contingent liabilities, amortization expenses or incremental operating expenses, any of 
which could harm our financial condition or results of operations. 

If we fail to comply with environmental, health, and safety laws and regulations, we could become subject to fines or penalties or incur costs that could 
harm our business. 

We will become subject to numerous environmental, health, and safety laws and regulations, including those governing laboratory procedures and 

the handling, use, storage, treatment, and disposal of hazardous materials and wastes. Our operations will involve the use of hazardous and flammable 
materials, including chemicals and biological materials. Our operations also may produce hazardous waste products. We generally anticipate contracting 
with third parties for the disposal of these materials and wastes. We will not be able to eliminate the risk of contamination or injury from these materials. In 
the event of contamination or injury resulting from any use by us of hazardous materials, we could be held liable for any resulting damages, and any 
liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties for failure to comply with 
such laws and regulations. 

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

from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities.

In addition, we may incur substantial costs in order to comply with current or future environmental, health, and safety laws and regulations. These 
current or future laws and regulations may impair our research, development, or production efforts. Our failure to comply with these laws and regulations 
also may result in substantial fines, penalties or other sanctions. 

Unfavorable global economic conditions could adversely affect our business, financial condition, stock price and results of operations. 

Our results of operations could be adversely affected by general conditions in the global economy and in the global financial markets. For example, 

the global financial crisis of 2008 caused extreme volatility and disruptions in the capital and credit markets. Similarly, the global economy has been 
impacted by fluctuating interest rates and inflation, as well as the possibility of a recession or further economic downturn. Moreover, adverse developments 
that affect financial institutions, such as events involving liquidity that are rumored or actual, have in the past and may in the future lead to market-wide 
liquidity problems. For example, on March 10, 2023, Silicon Valley Bank (“SVB”), one of our banking partners, was closed by the California Department 
of Financial Protection and Innovation, which appointed the Federal Deposit Insurance Corporation (the “FDIC”) as receiver. While we only had a minimal 
amount of our cash directly at SVB and, since that date, the FDIC has stated that all depositors of SVB will be made whole, there is no guarantee that the 
federal government would guarantee all depositors in the event of future bank closures, and continued instability in the banking system may adversely 
impact our business and financial condition. Likewise, the capital and credit markets may be adversely affected by the ongoing conflicts in Israel and 
Ukraine, and the possibility of a wider Middle Eastern, European or global conflict, global sanctions imposed in response thereto, an energy crisis and 
potential recessions. A weak or declining economy could also strain our suppliers, possibly resulting in supply disruption, or cause our customers to delay 
making payments for our services. If the current equity and credit markets deteriorate, it may make any necessary debt or equity financing more 

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difficult, more costly, and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse 
effect on our growth strategy, financial performance and stock price and could require us to delay or abandon clinical development plans. In addition, there 
is a risk that one or more of our current service providers, manufacturers and other partners may not survive such difficult economic times, which could 
directly affect our ability to attain our operating goals on schedule and on budget. Also, hospitals and other medical facilitates face staffing shortages, 
whether due to labor relations or otherwise, which could potentially cause delays in enrollment, site visits, evaluations or other activities important to our 
research and development efforts. Any of the foregoing could harm our business and we cannot anticipate all of the ways in which the current economic 
climate and financial market conditions could adversely impact our business. Furthermore, our stock price may decline due in part to the volatility of the 
stock market and any general economic downturn. 

We or the third parties upon whom we depend may be adversely affected by natural disasters and our business continuity and disaster recovery plans 
may not adequately protect us from a serious disaster. 

Natural disasters could severely disrupt our operations and have a material adverse effect on our business, results of operations, financial condition 

and prospects. If a natural disaster, fire, hurricane, power outage or other event occurred that prevented us from using all or a significant portion of our 
headquarters, that damaged critical infrastructure, such as our suppliers’ manufacturing facilities, or that otherwise disrupted operations, it may be difficult 
or, in certain cases, impossible for us to continue our business for a substantial period of time. 

The disaster recovery and business continuity plans we have in place may prove inadequate in the event of a serious disaster or similar event. We 

may incur substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which could have a material adverse 
effect on our business. 

Our internal computer and information systems, or those used by our CROs, CMOs or other contractors or consultants, may fail or suffer security 
breaches, which could result in a material disruption of our development programs. 

Despite the implementation of appropriate security measures, our internal computer and information systems and those of our current and any future 

CROs, CMOs and other contractors or consultants may become vulnerable to damage from computer viruses, unauthorized access, natural disasters, 
terrorism, war and telecommunication and electrical failures. While we have not experienced any such material system failure, or accident, and are unaware 
of any security breach to date, if such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our 
development programs and our business operations, whether due to a loss of our trade secrets or other proprietary information or other similar disruptions. 
For example, the loss of data from completed or future preclinical studies or clinical trials could result in significant delays in our regulatory approval 
efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or 
damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability, our competitive position 
could be harmed and the further development and commercialization of our product candidates could be significantly delayed.

A breakdown or breach of our technology systems could subject us to liability or interrupt the operation of our business. 

We are increasingly dependent upon technology systems and data to operate our business. In particular, the COVID-19 pandemic caused us to 

modify our business practices, including increasing the prevalence of employees working remotely. As a result, we are increasingly dependent upon our 
technology systems to operate our business and our ability to effectively manage our business depends on the security, reliability and adequacy of our 
technology systems and data, which includes use of cloud technologies, including Software as a Service (SaaS), Platform as a Service (PaaS) and 
Infrastructure as a Service (IaaS). A breakdown, invasion, corruption, destruction or breach of our technology systems, including the cloud technologies 
that we utilize, and/or unauthorized access to our data and information could subject us to liability or negatively impact the operation of our business. Our 
technology systems, including the cloud technologies that we utilize, continue to increase in multitude and complexity, making them potentially vulnerable 
to breakdown, malicious intrusion and random attack. Likewise, data privacy or security breaches by individuals authorized to access our technology 
systems, including the cloud technologies that we utilize, may pose a risk that sensitive data, including intellectual property, trade secrets or personal 
information belonging to us, our patients or other business partners, may be exposed to unauthorized persons or to the public. 

Cyber-attacks and other cybersecurity incidents are increasing in their frequency, sophistication and intensity, and have become increasingly difficult 

to detect. They are often carried out by motivated, well-resourced, skilled and persistent actors, including nation states, organized crime groups, 
“hacktivists” and employees or contractors acting with malicious intent. Cyber-attacks could include the deployment of harmful malware and key loggers, 
ransomware, a denial-of-service attack, a 

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malicious website, the use of social engineering and other means to affect the confidentiality, integrity and availability of our technology systems and data. 
Cyber-attacks could also include supply chain attacks, which could cause a delay in the manufacturing of our products or products produced for contract 
manufacturing. Our key business partners face similar risks and any security breach of their systems could adversely affect our security posture. Cyber-
attacks could include wrongful conduct by hostile foreign governments, industrial espionage, wire fraud and other forms of cyber fraud, the deployment of 
harmful malware, denial-of-service, social engineering fraud or other means to threaten data confidentiality, integrity and availability. A successful cyber-
attack could cause serious negative consequences for us, including, without limitation, the disruption of operations, the misappropriation of confidential 
business information, including financial information, trade secrets, financial loss and the disclosure of corporate strategic plans. To date, we have not 
experienced a material compromise of our data or information systems. However, although we devote resources to protect our information systems, we 
realize that cyber-attacks are a threat, and there can be no assurance that our efforts will prevent information security breaches that would result in business, 
legal, financial or reputational harm to us, or would have a material adverse effect on our results of operations and financial condition. 

In addition, the computer systems of various third parties on which we rely, including our CROs, CMOs and other contractors, consultants and law 
and accounting firms, may sustain damage from computer viruses, unauthorized access, data breaches, phishing attacks, cybercriminals, natural disasters 
(including hurricanes and earthquakes), terrorism, war and telecommunication and electrical failures. We rely on our third-party providers to implement 
effective security measures and identify and correct for any such failures, deficiencies or breaches. 

Moreover, our increased use of cloud technologies and remote working arrangements could heighten these and other operational risks, and any 

failure by cloud technology service providers to adequately safeguard their systems and prevent cyber-attacks could disrupt our operations and result in 
misappropriation, corruption or loss of confidential or propriety information. Despite the implementation of appropriate security measures, our internal 
computer and information systems and those of our current and any future CROs, CMOs and other contractors or consultants may become vulnerable to 
damage from computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. While we have not 
experienced any such material system failure, or accident, and are unaware of any security breach to date, if such an event were to occur and cause 
interruptions in our operations, it could result in a material disruption of our development programs and our business operations, whether due to a loss of 
our trade secrets or other proprietary information or other similar disruptions. For example, the loss of data from completed or future preclinical studies or 
clinical trials could result in significant delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the 
extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or 
proprietary information, we could incur liability, our competitive position could be harmed and the further development and commercialization of our 
product candidates could be significantly delayed. While we continue to build and improve our systems and infrastructure, including our business 
continuity plans, there can be no assurance that our efforts will prevent breakdowns or 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, operational or reputational harm to 
us, or loss of competitive advantage. In addition, our liability insurance may not be sufficient in type or amount to cover us against claims related to 
security breaches, cyber-attacks and other related breaches.

Our employees, principal investigators, CROs, CMOs and consultants may engage in misconduct or other improper activities, including non-
compliance with regulatory standards and requirements and insider trading. 

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 the regulations of FDA and non-U.S. regulators, provide accurate information to the FDA 
and non-U.S. regulators, 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 may 
restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs and other business 
arrangements. Such misconduct could also involve the improper use of information obtained in the course of clinical studies, which could result in 
regulatory sanctions and cause serious harm to our reputation. We have adopted a code of 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 governmental 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, including the imposition of significant fines or other sanctions. 

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Our business entails a significant risk of product liability and our ability to obtain sufficient insurance coverage could have a material and adverse 
effect on our business, financial condition, results of operations and prospects. 

We will face an inherent risk of product liability exposure related to the testing of STK-001, STK-002 and our future product candidates in clinical 
trials and will face an even greater risk if we commercialize any of our product candidates. If we cannot successfully defend ourselves against claims that 
our 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 any product candidates that we may develop; 

injury to our reputation and significant negative media attention; 

withdrawal of clinical trial participants; 

significant time and costs to defend the related litigation; 

substantial monetary awards to trial participants or patients; 

loss of revenue; and 

the inability to commercialize any product candidates that we may develop. 

While we currently have product liability insurance that we believe is appropriate for our stage of development, we may need to obtain higher levels 

prior to clinical development or marketing STK-001, STK-002 or any of our future product candidates. Any insurance we have or may obtain may not 
provide sufficient coverage against potential liabilities. Furthermore, clinical trial and product liability insurance is becoming increasingly expensive. As a 
result, we may be unable to obtain sufficient insurance at a reasonable cost to protect us against losses caused by product liability claims that could have a 
material and adverse effect on our business, financial condition, results of operations and prospects. 

Risks Related to Ownership of our Common Stock 

The market price of our stock may be volatile, and you could lose all or part of your investment. 

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

cannot control. The market price for our common stock may be influenced by many factors, including the other risks described in this section and 
elsewhere in this report and the following: 

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results of preclinical studies and clinical trials of our product candidates, or those of our competitors or our existing or future collaborators; 

regulatory or legal developments in the United States and other countries, especially changes in laws or regulations applicable to our product 
candidates; 

the success of competitive products or technologies; 

introductions and announcements of new products by us, our future commercialization partners, or our competitors, and the timing of these 
introductions or announcements; 

actions taken by regulatory agencies with respect to our product candidates, clinical studies, manufacturing process or sales and marketing 
terms; 

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

the success of our efforts to acquire or in-license additional technologies, products or product candidates; 

developments concerning any future collaborations, including but not limited to those with our sources of manufacturing supply and our 
commercialization partners; 

market conditions in the pharmaceutical and biotechnology sectors; 

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

developments or disputes concerning patents or other proprietary rights, including patents, litigation matters and our ability to obtain patent 
protection for our product candidates and products; 

our ability or inability to raise additional capital and the terms on which we raise it; 

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the recruitment or departure of key personnel; 

changes in the structure of healthcare payment systems; 

actual or anticipated changes in earnings estimates or changes in stock market analyst recommendations regarding our common stock, other 
comparable companies or our industry generally; 

our failure or the failure of our competitors to meet analysts’ projections or guidance that we or our competitors may give to the market; 

fluctuations in the valuation of companies perceived by investors to be comparable to us; 

announcement and expectation of additional financing efforts; 

speculation in the press or investment community; 

trading volume of our common stock; 

sales of our common stock by us or our stockholders; 

the concentrated ownership of our common stock; 

changes in accounting principles; 

terrorist acts, acts of war or periods of widespread civil unrest, including the conflict in Ukraine and actions taken by third parties in response 
to such conflict; 

natural disasters and other calamities; and 

general economic, industry and market conditions including interest rate increases and inflation.

In addition, the stock market in general, and the markets for pharmaceutical, biopharmaceutical and biotechnology stocks in particular, have 
experienced extreme price and volume fluctuations that have been often unrelated or disproportionate to the operating performance of the issuer, including 
as a result of  general economic conditions. These broad market and industry factors may seriously harm the market price of our common stock, regardless 
of our actual operating performance. The realization of any of the above risks or any of a broad range of other risks, including those described in this “Risk 
factors” section, could have a dramatic and adverse impact on the market price of our common stock. 

Our principal stockholders own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder 
approval. 

As of December 31, 2023 entities affiliated with Skorpios Trust beneficially owned 31.46% of the voting power of all outstanding shares of our 

common stock. As a result, these entities will have considerable influence over the outcome of corporate actions requiring stockholder approval, including 
the election of directors, amendment of our organizational documents, any merger, consolidation or sale of all or substantially all of our assets and any 
other significant corporate transaction. The interests of such entities may not be the same as or may even conflict with your interests. For example, these 
entities could potentially delay or prevent a change of control of our company, even if such a change of control would benefit our other stockholders, which 
could deprive our stockholders of an opportunity to receive a premium for their common stock as part of a sale of our company or our assets and might 
affect the prevailing market price of our common stock. 

In addition, Skorpios Trust received its shares from Apple Tree Partners, which previously controlled a majority of the voting power of our common 

stock. Seth L. Harrison, the chairman of our board of directors, serves as Managing Partner of Apple Tree Partners.

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

The trading market for our common stock will be influenced by the research and reports that industry or securities analysts publish about us or our 
business. We do not have any control over the analysts, or the content and opinions included in their reports. If any of the analysts who cover us issue an 
adverse or misleading opinion regarding us, our business model, our intellectual property or our stock performance, or if our preclinical studies and clinical 
trials and results of operations fail to meet the expectations of analysts, our stock price would likely decline. If one or more of such analysts cease coverage 
of us or fail to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause a decline in our stock price or 
trading volume. 

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We are an “emerging growth company” and a “smaller reporting company” and we cannot be certain if the reduced reporting requirements applicable 
to emerging growth companies or smaller reporting companies will make our common stock less attractive to investors. 

We are an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). For as long as we continue 

to be an emerging growth company, we may take advantage of exemptions from various reporting requirements that are applicable to other public 
companies that are not emerging growth companies, including (i) not being required to comply with the auditor attestation requirements of Section 404 of 
the Sarbanes-Oxley Act of 2002, as amended (the “Sarbanes-Oxley Act”), (ii) reduced disclosure obligations regarding executive compensation in our 
periodic reports and proxy statements and (iii) exemptions from the requirements of holding nonbinding advisory stockholder votes on executive 
compensation and stockholder approval of any golden parachute payments not approved previously. 

We will remain an emerging growth company until the earliest of (i) the last day of the fiscal year (a) in which we have total annual gross revenue of 
at least $1.235 billion or (b) in which we are deemed to be a large accelerated filer, which means the market value of our common stock that is held by non-
affiliates exceeds $700.0 million as of the prior June 30th, (ii) the date on which we have issued more than $1.0 billion in non-convertible debt during the 
prior three-year period and (iii) December 31, 2024. We anticipate ceasing to be an emerging growth company as of December 31, 2024, which is the last 
day of our fiscal year following the fifth anniversary of the completion of our IPO.

Under the JOBS Act, emerging growth companies can also delay adopting new or revised accounting standards until such time as those standards 

apply to private companies. We have elected to take advantage of the benefits of this extended transition period. Our consolidated financial statements may 
therefore not be comparable to those of companies that comply with such new or revised accounting standards. Until the date that we are no longer an 
“emerging growth company” or affirmatively and irrevocably opt out of the exemption provided by Section 7(a)(2)(B) of the Securities Act, upon issuance 
of a new or revised accounting standard that applies to our consolidated financial statements and that has a different effective date for public and private 
companies, we will disclose the date on which adoption is required for non-emerging growth companies and the date on which we will adopt the recently 
issued accounting standard. 

We are also a “smaller reporting company,” meaning that the market value of our stock held by non-affiliates was less than $700.0 million and our 

annual revenue was less than $100.0 million during the most recently completed fiscal year. We may continue to be a smaller reporting company as long as 
either (i) the market value of our stock held by non-affiliates is less than $250.0 million or (ii) our annual revenue is less than $100.0 million during the 
most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700.0 million. If we are a smaller reporting 
company at the time we cease to be an emerging growth company, we may continue to rely on exemptions from certain disclosure requirements that are 
available to smaller reporting companies. Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of 
audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth companies, smaller reporting companies have reduced 
disclosure obligations regarding executive compensation. We cannot predict if investors will find our common stock less attractive because we may rely on 
these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and 
our share price may be more volatile.

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

Our restated certificate of incorporation and our restated bylaws contain provisions that could delay or prevent a change in control of our company. 
These provisions could also make it difficult for stockholders to elect directors who are not nominated by current members of our board of directors or take 
other corporate actions, including effecting changes in our management. 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 only the board of directors to establish the number of directors and fill vacancies on the board; 

provide that directors may only be removed “for cause” and only with the approval of two-thirds of our stockholders; 

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

authorize the issuance of “blank check” preferred stock that our board 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; 

prohibit cumulative voting; and 

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

The exclusive forum provision in our restated certificate of incorporation may limit a stockholder’s ability to bring a claim in a judicial forum that it 
finds favorable for disputes with us or any of our directors, officers, or other employees, which may discourage lawsuits with respect to such claims.

Our restated certificate of incorporation, to the fullest extent permitted by law, provides that the Court of Chancery of the State of Delaware is 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 (the “DGCL”), our restated certificate of incorporation, or our restated bylaws; or any 
action asserting a claim against us that is governed by the internal affairs doctrine. This exclusive forum provision does not apply to suits brought to 
enforce a duty or liability created by the Exchange Act. It could apply, however, to a suit that falls within one or more of the categories enumerated in the 
exclusive forum provision and asserts claims under the Securities Act, inasmuch as Section 22 of the Securities Act creates concurrent jurisdiction for 
federal and state courts over all suits brought to enforce any duty or liability created by the Securities Act or the rule and regulations thereunder. There is 
uncertainty as to whether a court would enforce such provision with respect to claims under the Securities Act, and our stockholders will not be deemed to 
have waived our compliance with the federal securities laws and the rules and regulations thereunder. 

This choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or 

any of our directors, officers, or other employees, which may discourage lawsuits with respect to such claims. Alternatively, if a court were to find the 
choice of forum provisions contained in our restated certificate of incorporation to be inapplicable or unenforceable in an action, we may incur additional 
costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations and financial condition. 

In addition, Section 203 of the DGCL may discourage, delay or prevent a change in control of our company. Section 203 imposes certain restrictions 

on mergers, business combinations and other transactions between us and holders of 15% or more of our common stock.

Section 22 of the Securities Act creates concurrent jurisdiction for federal and state courts over all claims brought to enforce any duty or liability 

created by the Securities Act or the rules and regulations thereunder. In April 2020, we amended and restated our restated bylaws to provide that the federal 
district courts of the United States will, to the fullest extent permitted by law, be the exclusive forum for resolving any complaint asserting a cause of action 
arising under the Securities Act (such provision, a “Federal Forum Provision”). Our decision to adopt a Federal Forum Provision followed a decision by the 
Supreme Court of the State of Delaware holding that such provisions are facially valid under Delaware law. While there can be no assurance that federal or 
state courts will follow the holding of the Delaware Supreme Court or determine that the Federal Forum Provision should be enforced in a particular case, 
application of the Federal Forum Provision means that suits brought by our stockholders to enforce any duty or liability created by the Securities Act must 
be brought in federal court and cannot be brought in state court.

Section 27 of the Exchange Act creates exclusive federal jurisdiction over all claims brought to enforce any duty or liability created by the Exchange 

Act or the rules and regulations thereunder. In addition, neither the exclusive forum provision nor the Federal Forum Provision applies to suits brought to 
enforce any duty or liability created by the Exchange Act. Accordingly, actions by our stockholders to enforce any duty or liability created by the Exchange 
Act or the rules and regulations thereunder must be brought in federal court. 

Our stockholders will not be deemed to have waived our compliance with the federal securities laws and the regulations promulgated thereunder.

Any person or entity purchasing or otherwise acquiring or holding any interest in any of our securities shall be deemed to have notice of and 
consented to our exclusive forum provisions, including the Federal Forum Provision. These provisions may limit a stockholder’s ability to bring a claim in 
a judicial forum of their choosing for disputes with us or our directors, officers, or other employees, which may discourage lawsuits against us and our 
directors, officers, and other employees.

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We will incur increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new 
compliance initiatives and corporate governance practices. 

As a public company, and particularly after we are no longer an emerging growth company, we will incur significant legal, accounting and other 

expenses that we did not incur as a private company. The Sarbanes-Oxley Act, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the 
listing requirements of the Nasdaq Global Select Market (“Nasdaq”) and other applicable securities rules and regulations impose various requirements on 
public companies, including establishment and maintenance of effective disclosure and financial controls and corporate governance practices. Our 
management and other personnel will need to devote a substantial amount of time to these compliance initiatives. Moreover, we expect these rules and 
regulations to substantially increase our legal and financial compliance costs and to make some activities more time consuming and costly. We cannot 
predict or estimate the amount or timing of additional costs we may incur to respond to these requirements. The impact of these requirements could also 
make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as executive officers. 
Moreover, these rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity, and, as a result, their 
application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty 
regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices. 

If we fail to maintain proper and effective internal control over financial reporting in the future, our ability to produce accurate and timely financial 
statements could be impaired, which could harm our operating results, investors’ views of us and, as a result, the value of our common stock. 

We previously were not required to independently comply with Section 404(a) of the Sarbanes-Oxley Act. Section 404(a) of the Sarbanes-Oxley Act 
requires annual management assessments of the effectiveness of our internal control over financial reporting, starting with the second annual report that we 
file with the SEC. We were required to meet these standards in the course of preparing our financial statements as of and for the year ended December 31, 
2023, and our management is required to report on the effectiveness of our internal control over financial reporting for such year and annually thereafter. 
Additionally, once we are no longer an “emerging growth company,” our independent registered public accounting firm will be required pursuant to Section 
404(b) of the Sarbanes-Oxley Act to attest to the effectiveness of our internal control over financial reporting on an annual basis. The rules governing the 
standards that must be met for our management to assess our internal control over financial reporting are complex and require significant documentation, 
testing, and possible remediation.

To achieve compliance with Section 404(b) within the prescribed period, we will be engaged in a process to document and evaluate our internal 
control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal resources, potentially 
engage outside consultants and adopt a detailed work plan to assess and document the adequacy of internal control over financial reporting, continue steps 
to improve control processes as appropriate, validate through testing that controls are functioning as documented and implement a continuous reporting and 
improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to conclude, within the 
prescribed timeframe or at all, that our internal control over financial reporting is effective as required by Section 404. If we identify one or more material 
weaknesses, it could result in an adverse reaction in the financial markets due to a loss of confidence in the reliability of our consolidated financial 
statements. In addition, if we are not able to continue to meet these requirements, we may not be able to remain listed on Nasdaq. 

As we grow, we expect to hire additional personnel and may utilize external temporary resources to implement, document and modify policies and 

procedures to maintain effective internal controls. However, it is possible that we may identify deficiencies and weaknesses in our internal controls. If 
material weaknesses or deficiencies in our internal controls exist and go undetected or unremediated, our consolidated financial statements could contain 
material misstatements that, when discovered in the future, could cause us to fail to meet our future reporting obligations and cause the price of our 
common stock to decline. 

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

We have never declared or paid cash dividends on our capital stock. We currently intend to retain all of our future earnings, if any, to finance the 

growth and development of our business. As a result, capital appreciation, if any, of our common stock will be your sole source of gain for the foreseeable 
future. 

78

 
 
We may be subject to securities litigation, which is expensive and could divert management attention. 

The market price of our common stock may be volatile and, in the past, companies that have experienced volatility in the market price of their stock 
have been subject to securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result 
in substantial costs and divert our management’s attention from other business concerns, which could seriously harm our business.

Item 1B. Unresolved Staff Comments. 

None.

Item 1C. Cybersecurity

We recognize the critical importance of maintaining the trust and confidence of our all of our stakeholders. Our business increasingly depends on the 

efficient and uninterrupted operation of our information technology systems and those of our third-party contract research organizations, contract 
manufacturing organizations, or other vendors, contractors or consultants. Our board of directors and our management team are actively involved in the 
oversight of risk management, and cybersecurity represents an important component of our overall approach to compliance and risk management. Our 
cybersecurity policies, standards, processes and practices are integrated into our approach to compliance and risk management and follow recognized 
industry best practices. In general, we seek to address cybersecurity risks through a cross-functional approach that is focused on preserving the 
confidentiality, integrity, and availability of the information that we collect, process, and store by identifying, preventing and mitigating cybersecurity 
threats and effectively responding to cybersecurity incidents when they occur. 

Cybersecurity Risk Mitigation 

As one of the critical elements of our overall approach to compliance and risk management, our cybersecurity program is focused on the following 

key areas: 

Confidentiality and Integrity: To ensure the confidentiality and integrity of data and systems, we leverage encryption of data during transfer and at 

rest whenever possible and as necessary, least privileged access when granting access, strong passwords and two-factor authentication, and version-
controlled file systems. 

Availability: To preserve the availability of data and systems, we perform daily backups with some occurring multiple times a day. Additionally, to 
mitigate ransomware, data is stored in version-controlled file systems. When implementing systems, architectural patterns for redundancy and failover are 
used. 

Other Technical Safeguards: Additional technical safeguards that are designed to protect our information systems from cybersecurity threats 

include endpoint tools that detect and prevent threats on a computer and monitor for vulnerabilities, next generation firewalls, intrusion prevention and 
detection systems, and cybersecurity testing of our systems. 

Monitoring: We maintain a security operations center that monitors our systems and networks for anomalous activity. Additionally, our information 

technology (“IT”) team actively monitors different cybersecurity threat intelligence sources and responds accordingly based on risk. 

Education and Awareness: We provide regular, mandatory security awareness training for personnel to educate our employees on cybersecurity 

threats and to communicate our evolving information security policies, standards, processes, and practices. In addition to the training, we periodically test 
employees with phishing emails. 

Collaborative Approach: We have implemented a cross-functional approach to identifying, preventing, and mitigating cybersecurity threats and 

incidents, while also implementing controls and procedures that provide for the prompt escalation of certain cybersecurity incidents so that decisions 
regarding the public disclosure and reporting of such incidents can be made by management in a timely manner.  

Incident Response and Recovery Planning: We have established and maintain comprehensive incident response and recovery plans to address our 

response to a cybersecurity incident.  

79

 
 
Third-Party Risk Management: We maintain a risk-based approach to identifying cybersecurity risks presented by third parties, including vendors, 

service providers and other external users of our systems, as well as the systems of third parties that could adversely impact our business in the event of a 
cybersecurity incident affecting those third-party systems.  

Policies and Processes: We engage in the periodic assessment of our policies, standards, processes, and practices that are designed to address 

cybersecurity threats and incidents. These efforts include a wide range of activities, including audits, penetration testing and other exercises focused on 
evaluating the effectiveness of our cybersecurity measures. The results of such exercises, if material, are reported to the audit committee of our board and 
our board of directors, and we adjust our cybersecurity policies, standards, processes and practices as necessary based on the information provided by these 
assessments, audits and reviews. 

Governance 

Our board of directors, in coordination with our audit committee, oversees our risk management process. Our audit committee receives presentations 

and reports on cybersecurity risks, which address a wide range of topics including recent developments, evolving standards, vulnerability assessments, the 
threat environment, technological trends and information security considerations arising with respect to our peers and third parties. Our board of directors 
and audit committee also receive prompt and timely information regarding any cybersecurity incident that meets established reporting thresholds, as well as 
ongoing updates regarding any such incident until it has been addressed. On a periodic basis, our board of directors and audit committee discuss our 
approach to cybersecurity risk management with our head of IT. 

Our head of IT, in coordination and with support from our executive management team, works collaboratively across the company to implement a 

program designed to protect our information systems from cybersecurity threats and to promptly respond to any cybersecurity incidents in accordance with 
our incident response and recovery plans. Through ongoing communications with our entire employee basis and appropriate third-party contractors, the 
head of IT and the management team monitor the prevention, detection, mitigation and remediation of cybersecurity threats and incidents in real time and 
report such threats and incidents to our audit committee when appropriate.  

Our head of IT has over 20 years of experience building and managing information systems with cybersecurity principles, such as least privileged 

access, patching and vulnerability management, encryption, etc., as part of a foundation to ensure confidentiality, integrity, and availability. Our head of IT 
has also served in consulting and architecture roles for cybersecurity and compliance projects ranging from design and auditing systems, red team testing, 
to compliance audits and remediation for the Sarbanes-Oxley Act of 2002, as amended, and the payment card industry data security standards. 

No cybersecurity threats, including as a result of any previous cybersecurity incidents, have materially affected or are reasonably likely to affect us, 

including our business strategy, results of operations or financial condition

80

 
 
Item 2. Properties. 

We currently occupy approximately 38,000 square feet of office and laboratory space in Bedford, Massachusetts, under a lease that expires 

December 31, 2026. We also occupy 4,842 square feet of office space in Cambridge, Massachusetts under a lease that expires on April 30, 2025. We 
believe that our facilities suffice to meet our current and near-term needs and that suitable additional space will be available as and when needed.

Item 3. Legal Proceedings. 

From time to time we may be subject to various claims, complaints and legal actions that arise in the normal course of business. We are not 
presently party to any legal proceedings that, in the opinion of management, the outcome of which could have a material adverse effect on our business. 
Regardless of outcome, litigation can have an adverse impact on us due to defense and settlement costs, diversion of management resources, negative 
publicity and reputation harm, and other factors. There can be no assurance that future legal proceedings arising in the ordinary course of business or 
otherwise will not have a material adverse effect on our business, financial condition, or results of operations.

Item 4. Mine Safety Disclosures.

Not Applicable.

81

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

Unregistered Sales of Equity Securities and Use of Proceeds.

Unregistered Sales of Equity Securities

PART II

None.

Use of Proceeds

None.

Holders of Record

As of December 31, 2023, there were 6 holders of record of our common stock. The actual number of stockholders is greater than this number of 

record holders and includes stockholders who are beneficial owners but whose shares are held in street name by brokers and other nominees. This number 
of holders of record also does not include stockholders whose shares may be held in trust by other entities.

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. We currently intend to retain all available funds and any future earnings, if any, for use in the operation of our business. Any future determination to 
declare cash dividends will be made at the discretion of our board of directors, subject to applicable laws, and will depend on our financial condition, 
results of operations, capital requirements, general business conditions and other factors that our board of directors may deem relevant, and subject to the 
restrictions contained in future financing instruments. Consequently, stockholders will need to sell shares of our common stock to realize a return on their 
investment, if any.

Item 6. [Reserved]

82

 
 
 
 
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 consolidated results of operations together with our 
consolidated financial statements and related notes appearing elsewhere in this Annual Report on Form 10-K. Some of the information contained in this 
discussion and analysis or set forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and strategy for our 
business and related financing, includes forward-looking statements that involve risks and uncertainties. You should carefully read the sections entitled 
“Risk Factors” and “Special Note Regarding Forward-Looking Statements” to gain an understanding of the important factors that could cause actual 
results to differ materially from our forward-looking statements. 

Overview 

We are dedicated to addressing the underlying causes of severe diseases by upregulating protein expression with RNA-based medicines. Using our 

proprietary TANGO (Targeted Augmentation of Nuclear Gene Output) approach, we are developing antisense oligonucleotides (“ASOs”) to selectively 
restore protein levels. 

Our first compound, STK-001, is in clinical testing for the treatment of Dravet syndrome, a severe and progressive genetic epilepsy. Dravet 
syndrome is characterized by frequent, prolonged and refractory seizures beginning within the first year of life. The disease is classified as a developmental 
and epileptic encephalopathy due to the developmental delays and cognitive impairment associated with it. Dravet syndrome is one of many diseases 
caused by a haploinsufficiency, in which a loss of approximately 50% of normal protein levels leads to disease. We have announced end of study data from 
our two Phase 1/2a open-label studies of STK-001, MONARCH in the United States and ADMIRAL in the United Kingdom. We also have 
SWALLOWTAIL in the U.S. and LONGWING in the U.K., which are Open Label Extension (“OLE”) studies of STK-001 for children and adolescents 
with Dravet syndrome. Patients who participated in the MONARCH study in the United States or the ADMIRAL study in the United Kingdom and met 
study entry criteria are eligible to continue treatment in SWALLOWTAIL or LONGWING, respectively, both of which are designed to evaluate the long-
term safety and tolerability of repeat doses of STK-001.

We are also pursuing treatment for a second haploinsufficient disease, autosomal dominant optic atrophy (“ADOA”), the most common inherited 
optic nerve disorder. STK-002 is our lead clinical candidate for the treatment of ADOA. STK-002 is designed to upregulate OPA1 protein expression by 
leveraging the non-mutant (wild-type) copy of the OPA1 gene to restore OPA1 protein expression with the aim to stop or slow vision loss in patients with 
ADOA. We have received authorization in the United Kingdom to proceed with a Phase 1 open-label study (OSPREY) of STK-002, and we expect the 
study to start in 2024. 

In May 2022, we filed a universal Shelf Registration statement on Form S-3 (the “Registration Statement”) with the SEC. The Registration 
Statement was declared effective by the SEC on May 31, 2022, and contains two prospectuses: a base prospectus, which covers the offering, issuance and 
sale by us of up to a maximum aggregate offering price of $400.0 million of our common stock, preferred stock, debt securities, warrants to purchase 
common stock, preferred stock or debt securities, subscription rights to purchase common stock, preferred stock or debt securities and/or units consisting of 
some or all of these securities; and a sales agreement prospectus covering the offering, issuance and sale by us of up to a maximum aggregate offering price 
of $150.0 million of common stock that may be issued and sold under a Controlled Equity Offering Sales Agreement (“Sales Agreement”). The specific 
terms of any securities to be offered pursuant to the base prospectus will be specified in a prospectus supplement to the base prospectus. The $150.0 million 
of common stock that may be offered, issued and sold under the sales agreement prospectus is included in the $400.0 million of securities that may be 
offered, issued and sold by us under the base prospectus. As of December 31, 2023, we had issued approximately 6.3 million shares of common stock 
pursuant to the Sales Agreement for net proceeds of $52.1 million. We may terminate this at-the-market program at any time, pursuant to its terms. 

As of December 31, 2023 and 2022 we had $201.4 million and $229.6 million, respectively, in cash, cash equivalents and marketable securities. 

Since inception, we have had operating losses, the majority of which are attributable to research and development activities. Our net losses were 
$104.7 million and $101.1 million for the years ended December 31, 2023 and 2022, respectively. As of December 31, 2023, we had an accumulated deficit 
of $401.8 million and as of December 31, 2022, we had an accumulated deficit of $297.2 million.

Our primary use of cash is to fund operating expenses, which consist primarily of research and development expenditures, and to a lesser extent, 

general and administrative expenditures. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the 
change in our outstanding accounts payable and accrued expenses. We expect to continue to incur net losses for the foreseeable future, and we expect our 
research and development expenses, general and administrative expenses, and capital expenditures will continue to increase. In particular, 

83

 
 
we expect our expenses and losses to increase as we continue our development of, and seek regulatory approvals for, our product candidates, and begin to 
commercialize any approved products, as well as hire additional personnel, develop commercial infrastructure, pay fees to outside consultants, lawyers and 
accountants, and incur increased costs associated with being a public company such as expenses related to services associated with maintaining compliance 
with Nasdaq listing rules and SEC requirements, insurance and investor relations costs. Our net losses may fluctuate significantly from quarter-to-quarter 
and year-to-year, depending on the timing of our clinical trials and our expenditures on other research and development activities.

Based upon our current operating plan, we believe that our cash, cash equivalents and marketable securities of $201.4 million as of December 31, 
2023, together with the proceeds since December 31, 2023 from the Sales Agreement of $1.3 million, will enable us to fund our operating expenses and 
capital expenditure requirements to the end of 2025. To date, we have not had any products approved for sale and have not generated any product sales. We 
do not expect to generate any revenues from product sales unless and until we successfully complete development and obtain regulatory approval for one or 
more of our product candidates, which we expect will take a number of years. If we obtain regulatory approval for any of our product candidates, we expect 
to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution. As a result, until such time, if ever, as 
we can generate substantial product revenue, we expect to finance our cash needs through equity offerings, debt financings or other capital sources, 
including potentially collaborations, licenses and other similar arrangements. However, we may be unable to raise additional funds or enter into such other 
arrangements when needed on favorable terms or at all. Any failure to raise capital as and when needed could have a negative impact on our financial 
condition and on our ability to pursue our business plans and strategies. If we are unable to raise capital, we will need to delay, reduce or terminate planned 
activities to reduce costs. 

License and Collaboration Agreement with Acadia Pharmaceuticals Inc.

In January 2022, we entered into a license and collaboration agreement with Acadia Pharmaceuticals Inc. (“Acadia”) for the discovery, development 

and commercialization of novel RNA-based medicines for the treatment of severe and rare genetic neurodevelopmental diseases of the central nervous 
system. The agreement focuses on the targets SYNGAP1, MECP2 (Rett syndrome), and an undisclosed neurodevelopmental target of mutual interest. In 
connection with each target, we will collaborate with Acadia to identify potential treatments for further development and commercialization as licensed 
products. With respect to SYNGAP1, we have agreed with Acadia to co-develop and co-commercialize licensed products for such target globally, and in 
connection therewith we granted to Acadia worldwide, co-exclusive (with us) licenses for such licensed products. With respect to MECP2 and the 
neurodevelopmental target, we granted to Acadia worldwide, exclusive licenses to develop and commercialize licensed products for such targets. 

Pursuant to the terms of the agreement, we received an upfront payment of $60.0 million from Acadia. Acadia agreed to fund the research to 
identify potential licensed products for MECP2 and the neurodevelopmental target, and we will equally fund with Acadia the research to identify potential 
licensed products for SYNGAP1. We are eligible to receive up to $907.5 million in potential total milestone payments based upon the achievement of 
certain development, regulatory, first commercial sales and sales milestone events across the programs for the three targets, assuming each milestone were 
achieved at least once. With respect to licensed products for MECP2 and the neurodevelopmental target, we are also eligible to receive tiered royalties at 
percentages ranging from the mid-single digits to the mid-teens on future net sales by Acadia of licensed products worldwide. Royalties payable under the 
agreement are subject to standard royalty reductions. For SYNGAP1 licensed products that we are co-developing and co-commercializing, we will be 
responsible for 50% of the development and commercialization costs and will receive 50% of the profits from global commercialization. We are provided 
with a co-development and co-commercialization opt out option relating to the SYNGAP1 target indication at our discretion. Such opt-out would reduce 
development and commercialization milestones but would provide us with royalties on an escalating basis attributable to net sales milestones.

Financial Operations Overview 

Revenue 

We currently do not have any products approved for sale and have not generated any revenue since inception through December 31, 2023. If we are 

able to successfully develop, receive regulatory approval for and commercialize any of our current or future product candidates alone or in collaboration 
with third parties, we may generate revenue from the sales of these product candidates. 

In January 2022, we entered into a license and collaboration agreement with Acadia Pharmaceuticals Inc. (“Acadia”) for the discovery, development 

and commercialization of novel RNA-based medicines for the treatment of severe and rare genetic neurodevelopmental diseases of the central nervous 
system (the “CNS”). The agreement focuses on the targets 

84

 
 
SYNGAP1, MECP2 (Rett syndrome), and an undisclosed neurodevelopmental target of mutual interest. In connection with each target, we will collaborate 
with Acadia to identify potential treatments for further development and commercialization as licensed products. With respect to SYNGAP1, we have 
agreed with Acadia to co-develop and co-commercialize licensed products for such target globally, and in connection therewith we granted to Acadia 
worldwide, co-exclusive (with us) licenses for such licensed products. With respect to MECP2 and the neurodevelopmental target, we granted to Acadia 
worldwide, exclusive licenses to develop and commercialize licensed products for such targets. 

Pursuant to the terms of the agreement, we received an upfront payment of $60.0 million from Acadia. Acadia agreed to fund the research to 
identify potential licensed products for MECP2 and the neurodevelopmental target, and we will equally fund with Acadia the research to identify potential 
licensed products for SYNGAP1. We are eligible to receive up to $907.5 million in potential total milestone payments based upon the achievement of 
certain development, regulatory, first commercial sales and sales milestone events across the programs for the three targets, assuming each milestone were 
achieved at least once. With respect to licensed products for MECP2 and the neurodevelopmental target, we are also eligible to receive tiered royalties at 
percentages ranging from the mid-single digits to the mid-teens on future net sales by Acadia of licensed products worldwide. Royalties payable under the 
agreement are subject to standard royalty reductions. For SYNGAP1 licensed products that we are co-developing and co-commercializing, we will be 
responsible for 50% of the development and commercialization costs and will receive 50% of the profits from global commercialization. We are provided 
with a co-development and co-commercialization opt out option relating to the SYNGAP1 target indication at our discretion. Such opt-out would reduce 
development and commercialization milestones but would provide us with royalties on an escalating basis attributable to net sales milestones.

For the year ended, December 31, 2023, we recognized revenue related to the Acadia collaboration of $8.8 million and for the year ended, 

December 31, 2022, we recognized revenue related to the Acadia collaboration of $12.4 million.

See Note 8—License and Collaboration Agreement with Acadia Pharmaceuticals, Inc. of the notes to our consolidated financial statements included 

elsewhere in this Annual Report on Form 10-K. 

Research and development 

Research and development expenses consist primarily of costs incurred for the development of our discovery work and preclinical programs, which 

include: 

•

•

•

•

•

personnel costs, which include salaries, benefits and stock-based compensation expense; 

expenses incurred under agreements with consultants, third-party contract organizations that conduct research and development activities on 
our behalf, costs related to production of preclinical material and laboratory and vendor expenses related to the execution of preclinical 
studies; 

scientific consulting, collaboration and licensing fees; 

laboratory supplies; and 

facilities costs, depreciation and other expenses related to internal research and development activities. 

We use our personnel and infrastructure resources across multiple research and development programs directed toward identifying and developing 

product candidates. Our direct research and development expenses are tracked on a program-by-program basis from the point a program becomes a clinical 
candidate for us and consists primarily of external costs, such as fees paid to consultants, central laboratories and contractors in connection with our 
preclinical activities. We do not allocate employee costs, costs associated with our technology or facility expenses, including depreciation or other indirect 
costs, to specific programs because these costs are currently deployed across multiple product development programs and, as such, are not separately 
classified. We use internal resources to manage our development activities and our employees work across multiple development programs and, therefore, 
we do not track their costs by program. 

85

 
 
The table below summarizes our research and development expenses incurred by development program: 

STK-001
STK-002
SYNGAP1
MECP2
Non-program specific and unallocated research
   and development expenses

Total research and development expenses

Year ended December 31,

2023

2022

(in thousands)

27,078     $
7,997    
554    
994    

45,608    
82,231     $

25,327  
9,087  
405  
745  

42,273  
77,837  

  $

  $

We expense all research and development costs in the periods in which they are incurred. Costs for certain development activities are recognized 
based on an evaluation of the progress to completion of specific tasks using information and data provided to us by our vendors and third-party service 
providers. 

We expect that our expenses will increase substantially in connection with our planned discovery work, preclinical and clinical development 
activities in the near term and our planned clinical trials in the future. At this time, we cannot reasonably estimate the costs for completing the preclinical 
and clinical development of any of our other product candidates. We expect our research and development expenses to increase substantially for the 
foreseeable future as we continue to invest in research and development activities related to developing our product candidates, including investments in 
manufacturing, as our programs advance into later stages of development and we conduct clinical trials. The process of conducting the necessary clinical 
research to obtain regulatory approval is costly and time-consuming, and the successful development of our product candidates is highly uncertain. As a 
result, we are unable to determine the duration and completion costs of our research and development projects or when and to what extent we will generate 
revenue from the commercialization and sale of any of our product candidates. 

Because of the numerous risks and uncertainties associated with product development, we cannot determine with certainty the duration and 

completion costs of the current or future preclinical studies and clinical trials or if, when, or to what extent we will generate revenues from the 
commercialization and sale of our product candidates. We may never succeed in achieving regulatory approval for our product candidates. The duration, 
costs and timing of preclinical studies and clinical trials and development of our product candidates will depend on a variety of factors, including: 

•

•

•

•

•

•

•

•

•

•

•

successful completion of preclinical studies and investigational new drug-enabling studies; 

successful enrollment in, and completion of, clinical trials; 

receipt of regulatory approvals from applicable regulatory authorities; 

furthering our commercial manufacturing capabilities and arrangements with third-party manufacturers; 

obtaining and maintaining patent and trade secret protection and non-patent exclusivity; 

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

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

effectively competing with other therapies and treatment options; 

a continued acceptable safety profile following approval; 

enforcing and defending intellectual property and proprietary rights and claims; and 

achieving desirable medicinal properties for the intended indications. 

86

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
A change in the outcome of any of these factors could mean a significant change in the costs and timing associated with the development of our 

current and future preclinical and clinical product candidates. For example, if the FDA, or another regulatory authority were to require us to conduct 
clinical trials beyond those that we currently anticipate will be required for the completion of clinical development, or if we experience significant delays in 
execution of or enrollment in any of our preclinical studies or clinical trials, we could be required to expend significant additional financial resources and 
time on the completion of preclinical and clinical development. We expect our research and development expenses to increase for the foreseeable future as 
we continue the development of product candidates. 

General and administrative expenses 

General and administrative expenses consist primarily of personnel costs, costs related to maintenance and filing of intellectual property, expenses 

for outside professional services, including legal, human resources, information technology, audit and accounting services, and facilities and other 
expenses. Personnel costs consist of salaries, benefits and stock-based compensation expense. We expect our general and administrative expenses to 
increase over the next several years to support our continued research and development activities, manufacturing activities, increased costs of operating as a 
public company and the potential commercialization of our product candidates. These increases are anticipated to include increased costs related to the 
hiring of additional personnel, developing commercial infrastructure, fees to outside consultants, lawyers and accountants, and increased costs associated 
with being a public company such as expenses related to services associated with maintaining compliance with Nasdaq listing rules and SEC requirements, 
insurance and investor relations costs. 

Other income (expense) 

Our other income (expense), includes (i) interest income earned on cash reserves in our operating money market fund, investment accounts and on 

our marketable securities investments and (ii) other items of income (expense), net. 

Results of Operations for the Years Ended December 31, 2023 and 2022

The following table sets forth our results of operations: 

Consolidated statements of operations
Revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense):

Interest income (expense), net
Other income (expense), net

Total other income (expense)

Net loss

87

Year ended December 31,
2022
2023

(in thousands)

  $

8,780  

  $

12,405  

82,231    
41,322    
123,553    
(114,773 )  

9,908    
166    
10,074    
(104,699 )   $

77,837  
38,924  
116,761  
(104,356 )

3,122  
167  
3,289  
(101,067 )

  $

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
Research and development expenses 

Research and development expenses were $82.2 million for the year ended December 31, 2023 as compared to $77.8 million for the year ended 

December 31, 2022, an increase of $4.4 million. The table below summarizes our research and development expenses: 

STK-001
STK-002
SYNGAP1
MECP2
Personnel-related expenses
Third-party services
Scientific consulting
Facilities and other research and
   development expenses
Total research and development expenses

Year Ended December 31,

2023

2022

(in thousands)

27,078     $
7,997    
554    
994    
31,485    
2,085    
1,093    

10,945    
82,231     $

25,327  
9,087  
405  
745  
29,028  
3,409  
794  

9,042  
77,837  

  $

  $

The increase in research and development expenses were primarily attributable to an increase of $2.5 million in personnel costs resulting from 
annual compensation increases and increases in stock-based compensation expense, $1.9 million in facilities and other research and development costs, an 
increase of $1.8 million in expenses related to our STK-001 program, which is comprised of third-party services and scientific consulting fees, offset by a 
decrease of $1.1 million in expenses related to our STK-002 program, which is comprised of third-party services and scientific consulting fees, and a 
decrease of $0.7 million in external third-party expenses related to SYNGAP1, MECP2, and non-project specific consulting and third-party services. The 
increase in expenses reflects the accelerating pace of research and development activities and the increases in personnel needed to support those activities.

General and administrative expenses 

General and administrative expenses were $41.3 million for the year ended December 31, 2023 as compared to $38.9 million for the year ended 

December 31, 2022, an increase of $2.4 million. 

The increases in general and administrative expenses were primarily attributable to an increase of $2.2 million in personnel costs, including 
increases in stock-based compensation expense, from increases in headcount and the annual options award and an increase of $0.2 million in third-party 
services to support our in-house personnel in various aspects of developing and supporting the business including human resources, information 
technology, audit, tax, public relations, communications and other general and administrative activities.

Other income (expense) 

The change in our other income (expense) for the year ended December 31, 2023 as compared to the year ended December 31, 2022 primarily 

reflects an increase in cash balances throughout the year as well as increased interest rates.

Liquidity and Capital Resources

Since our inception through December 31, 2023, our operations have been financed by net proceeds of $542.6 million from the sale of convertible 

notes payable and our convertible preferred stock, our initial public offering, follow-on offering, proceeds from the controlled equity offering sales 
agreements and the upfront payment from Acadia. As of December 31, 2023, we had $201.4 million in cash, cash equivalents and marketable securities. 
Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view to liquidity and capital preservation. 

We have incurred losses since our inception in June 2014 and, as of December 31, 2023 and 2022, we had accumulated deficits of $401.8 million 

and $297.2 million, respectively. Our primary use of cash is to fund operating expenses, which consist primarily of research and development expenditures, 
and to a lesser extent, general and administrative expenditures. Cash used to fund operating expenses is impacted by the timing of when we pay these 
expenses, as reflected in the change in our outstanding accounts payable and accrued expenses. 

88

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Our product candidates may never achieve commercialization and we anticipate that we will continue to incur losses for the foreseeable future. We 

expect that our research and development expenses, general and administrative expenses, and capital expenditures will continue to increase. As a result, 
until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt 
financings or other capital sources, including potentially collaborations, licenses and other similar arrangements. Our primary uses of capital are, and we 
expect will continue to be, compensation and related expenses, third-party clinical research and development services, costs relating to the build-out of our 
headquarters and manufacturing facility, license payments or milestone obligations that may arise, laboratory and related supplies, clinical costs, 
manufacturing costs, legal and other regulatory expenses and general overhead costs. 

Based upon our current operating plan, we believe that our cash, cash equivalents and marketable securities of $201.4 million as of December 31, 
2023, together with the proceeds since December 31, 2023 from the Sales Agreement of $1.3 million, will enable us to fund our operating expenses and 
capital expenditure requirements to the end of 2025. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our 
available capital resources sooner than we currently expect. We will continue to require additional financing to advance our current product candidates 
through clinical development, to develop, acquire or in-license other potential product candidates and to fund operations for the foreseeable future. We will 
continue to seek funds through equity offerings, debt financings or other capital sources, including potentially collaborations, licenses and other similar 
arrangements. However, we may be unable to raise additional funds or enter into such other arrangements when needed on favorable terms or at all. If we 
do raise additional capital through public or private equity offerings, the ownership interest of our existing stockholders will be diluted, and the terms of 
these securities may include liquidation or other preferences that adversely affect our stockholders’ rights. If we raise additional capital through debt 
financing, we may be subject to covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital 
expenditures or declaring dividends. Any failure to raise capital as and when needed could have a negative impact on our financial condition and on our 
ability to pursue our business plans and strategies. If we are unable to raise capital, we will need to delay, reduce or terminate planned activities to reduce 
costs. 

Because of the numerous risks and uncertainties associated with research, development and commercialization of pharmaceutical products, we are 

unable to estimate the exact amount of our operating capital requirements. Our future funding requirements will depend on many factors, including, but not 
limited to: 

•

•

•

•

•

•

•

•

•

the scope, progress, results and costs of researching and developing our lead product candidates or any future product candidates, and 
conducting nonclinical studies and clinical trials; 

the timing of, and the costs involved in, obtaining regulatory approvals or clearances for our lead product candidates or any future product 
candidates; 

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

the timing of any cash milestone payments if we successfully achieve certain predetermined milestones; 

the cost of manufacturing our lead product candidates or any future product candidates and any products we successfully commercialize, 
including costs associated with building-out our manufacturing capabilities; 

our ability to establish and maintain strategic collaborations, licensing or other arrangements and the financial terms of any such agreements 
that we may enter into; 

the expenses needed to attract and retain skilled personnel; 

the costs associated with being a public company; and 

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

Further, our operating plans may change, and we may need additional funds to meet operational needs and capital requirements for clinical trials and 

other research and development activities. We currently have no credit facility or committed sources of capital. Because of the numerous risks and 
uncertainties associated with the development and commercialization of our product candidates, we are unable to estimate the amounts of increased capital 
outlays and operating expenditures associated with our current and anticipated product development programs. 

89

 
 
Cash flows 

The following table summarizes our cash flows: 

Net cash provided by (used in):

Operating activities
Investing activities
Financing activities

  $

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

  $

Year ended December 31,

2023

2022

(in thousands)

(81,067 )   $
105,946    
53,007    

77,886     $

(31,866 )
(45,882 )
46,409  

(31,339 )

Operating activities 

During the year ended December 31, 2023, cash used in operating activities was $81.1 million. This was primarily attributable to a net loss of 

$104.7 million and by a net change of $6.0 million in our net operating assets and liabilities, offset by non-cash charges of $29.6 million for stock-based 
compensation, depreciation, amortization and accretion of marketable securities, and reduction in the carrying amount of right of use assets.

During the year ended December 31, 2022, cash used in operating activities was $31.9 million. This was primarily attributable to a net loss of 
$101.1 million and by a net change of $8.7 million in our net operating assets and liabilities, offset by $51.7 million in deferred revenue received as part of 
the Acadia collaboration and to non-cash charges of $26.2 million for share-based compensation, depreciation, amortization and accretion of marketable 
securities, and reduction in the carrying amount of right of use assets.

Investing activities 

Our investing activities during the years ended December 31, 2023 and 2022 have consisted of purchases of property and equipment and purchases 

and sales of marketable securities. 

Financing activities 

Our financing activities during year ended December 31, 2023 consisted of $0.4 million from the exercise of stock options, $0.6 million in proceeds 

from our Employee Stock Purchase Plan and $52.1 million of net proceeds from the controlled equity offering sales agreements.

Our financing activities during year ended December 31, 2022 consisted of $0.5 million from the exercise of stock options, $0.6 million in proceeds 

from our Employee Stock Purchase Plan and $45.3 million of net proceeds from the controlled equity offering sales agreements.

Contractual Obligations and Commitments 

The following table summarizes our contractual obligations as of December 31, 2023 and the effects that such obligations are expected to have on 

our liquidity and cash flows in future periods: 

Operating lease obligations
Total

Total

Less Than
1 Year

Payments Due by Period
1 to 3
Years
(in thousands)

4 to 5
Years

More than
5 Years

  $
  $

7,833     $
7,833     $

2,608     $
2,608     $

5,225     $
5,225     $

—     $
—     $

—  
—  

In August 2018, we entered into an agreement to lease approximately 23,000 square feet of space for a term of three years. Lease terms are triple net 

lease commencing at $0.9 million per year, then with 3% annual base rent increases plus operating expenses, real estate taxes, utilities and janitorial fees. 
The lease commencement date was December 10, 2018. 

90

 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In September 2021, we entered into an agreement to extend the initial term of the 23,000 square foot lease for a period of three years ending 
December 31, 2024. In addition, this agreement provides for the lease of an additional 15,000 square feet of rentable space beginning on April 1, 2022 and 
ending on December 31, 2024. Initial monthly lease payments are approximately $0.1 million with respect to the 23,000 square feet space, and $0.1 million 
with respect to the 15,000 square feet space, and in each case subject to annual rent escalations.

In December 2023, we entered into an agreement to extend the term of the 38,000 square foot lease for a period of two years commencing on 

January 1, 2025 and ending on December 31, 2026. In December 2023, we recognized a right-of-use asset and operating lease liability of $4.1 million.

In December 2018, we entered into an agreement to lease 2,485 square feet of space for a term of three years. The lease includes one renewal option 
for an additional two years. Lease terms commence at $0.2 million per year, with 2.5% annual base rent increases plus operating expenses, real estate taxes, 
utilities and janitorial fees. We occupied this space in May 2019. 

In June 2021, we amended the agreement to extend the initial term of the 2,485 square foot lease for a period of three years ending April 30, 2025. 
In addition, the amendment provided for the lease of an additional 2,357 square feet of rentable space beginning on July 6, 2021 and ending on April 30, 
2025. The amended lease provides us with the option to extend the term of the lease for an additional two years with a base annual rent increase of 3%.

Commitments 

Our commitments primarily consist of obligations under our agreement with the University of Southampton. As of December 31, 2023, we were 

unable to estimate the timing or likelihood of achieving the milestones or making future product sales. For additional information regarding our 
agreements, see “Business—License and research agreements.” 

Additionally, we have entered into agreements with third-party contract manufacturers for the manufacture and processing of certain of our product 
candidates for preclinical testing purposes, and we have entered and will enter into other contracts in the normal course of business with contract research 
organizations for clinical trials and other vendors for other services and products for operating purposes. These agreements generally provide for 
termination or cancellation, other than for costs already incurred.

Off-Balance Sheet Arrangements 

During the periods presented, we did not have, nor do we currently have, any off-balance sheet arrangements as defined under SEC rules. 

Critical Accounting Policies and Significant Judgments and Estimates 

Our management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, 

which have been prepared in accordance with generally accepted accounting principles, or GAAP. The preparation of these consolidated financial 
statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets 
and liabilities at the date of the consolidated financial statements, as well as the reported expenses incurred during the reporting periods. Our estimates are 
based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis 
for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these 
estimates under different assumptions or conditions. We believe that the accounting policies discussed below are critical to understanding our historical and 
future performance, as these policies relate to the more significant areas involving management’s judgments and estimates. 

While our significant accounting policies are more fully described in Note 2 to our consolidated financial statements appearing elsewhere in this 

Annual Report on Form 10-K, we believe that the following accounting policies are the most critical in order to fully understand and evaluate our financial 
condition and results of operations. 

Revenue Recognition 

We recognize revenue in accordance with Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers (“ASC 
606”). This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, and 
financial instruments. Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that 
reflects the 

91

 
 
 
 
consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity 
determines are within the scope of ASC 606, the entity performs the following five-step analysis: (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 a performance obligation. We only apply the five-step analysis to contracts when it is 
probable that the entity will collect the consideration to which it is entitled in exchange for the goods or services it transfers to the customer. As part of the 
accounting for these arrangements, we must use significant judgment to determine: (a) the number of performance obligations based on the determination 
under step (ii) above; (b) the transaction price under step (iii) above; and (c) the timing of satisfaction of performance obligations as a measure of progress 
in step (v) above.

For contracts determined to be within the scope of ASC 606, we assess whether the goods or services promised within each contract are distinct to 

identify those that are performance obligations. This assessment involves subjective determinations and requires management to make judgments about the 
individual promised goods or services and whether such are separable from the other aspects of the contractual relationship. Promised goods and services 
are considered distinct provided that: (i) the customer can benefit from the good or service either on its own or together with other resources that are readily 
available to the customer, and (ii) the entity’s promise to transfer the good or service to the customer is separately identifiable from other promises in the 
contract. In assessing whether a promise or performance obligation is distinct from the other promises, we consider factors such as the research, 
development, manufacturing and commercialization capabilities of the customer and the availability of the associated expertise in the general marketplace. 
In addition, we consider whether the customer can benefit from a promise for its intended purpose without the receipt of the remaining promise, whether 
the value of the promise is dependent on the unsatisfied promise, whether there are other vendors that could provide the remaining promise, and whether it 
is separately identifiable from the remaining promise. For licenses that are combined with other promises, we utilize judgment to assess the nature of the 
combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, 
the appropriate method of measuring progress for purposes of recognizing revenue. 

The licenses of our intellectual property granted to Acadia were not determined to be distinct from the other promises or performance obligations, 
i.e., research and development services, identified in the arrangement. Accordingly, such licenses are therefore combined with research and development 
services in the arrangement. Payments or reimbursements resulting from our research and development efforts are recognized as the services are performed 
and presented on a gross basis because we are the principal for such efforts.

The transaction price (the amount of consideration we expect to be entitled to from a customer in exchange for the promised good or services) is 

determined and allocated to the identified performance obligations in proportion to their standalone selling prices (“SSP”) on a relative SSP basis. SSP is 
determined at contract inception and is not updated to reflect changes between contract inception and when the performance obligations are satisfied.

We use significant judgment to determine whether milestone payments or other variable consideration, except for royalties, should be included in 

the transaction price. The transaction price is allocated to each performance obligation based on the relative standalone selling prices of each performance 
obligation in the contract, and we recognize revenue based on those amounts when, or as, the performance obligations under the contract are satisfied. Any 
variable consideration is constrained, and therefore, the cumulative revenue associated with this consideration is not recognized until it is deemed not to be 
at significant risk of reversal.

We then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation(s) when (or as) each 
performance obligation is satisfied, either at a point in time or over time, and if over time recognition is based on the appropriate method of measuring 
progress for purposes of recognizing revenue. We evaluate the measure of progress each reporting period and, if necessary, adjusts the measure of 
performance and related revenue recognition. Amounts received prior to being recognized as revenue are recorded as deferred revenue. Amounts expected 
to be recognized as revenue within the 12 months following the balance sheet date are classified as current portion of deferred revenue in the accompanying 
consolidated balance sheets. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as 
deferred revenue, net of current portion.

Customer options: If an arrangement is determined to contain customer options that allow the customer to acquire additional goods or services, the 

goods and services underlying the customer options are not considered to be performance obligations at the outset of the arrangement, as they are 
contingent upon option exercise. We evaluate the customer options for material rights, that is, the option to acquire additional goods or services for free or 
at a discount. If the customer options are determined to represent a material right, the material right is recognized as a separate performance obligation at 
the outset of the arrangement. We allocate the transaction price to material rights based on the standalone selling price. As a practical alternative to 
estimating the standalone selling price when the goods or services are both (i) similar to the original goods and services in the contract and (ii) provided in 
accordance with the terms of the original contract, we allocate the total amount of 

92

 
 
consideration expected to be received from the customer to the total goods or services expected to be provided to the customer. Amounts allocated to any 
material right are not recognized as revenue until the option is exercised and the performance obligation is satisfied.

No such material rights were identified in the arrangement with Acadia. If such material rights were identified, then we would allocate the 
transaction price to material rights based on the relative standalone selling price, which is determined based on the identified discount and the probability 
that the customer will exercise the option. Amounts allocated to a material right are not recognized or begin to be recognized as revenue until, at the 
earliest, the option is exercised.

Milestone payments: At the inception of each arrangement that includes milestone payments, we evaluate whether a significant reversal of 

cumulative revenue provided in conjunction with achieving the milestones is probable and estimate the amount to be included in the transaction price using 
the most likely amount method. If it is probable that a significant reversal of cumulative revenue would not occur, the associated milestone value is 
included in the transaction price. Milestone payments that are not within the control of us or the licensee, such as regulatory approvals, are not considered 
probable of being achieved until those approvals are received. For other milestones, we evaluate factors such as the scientific, clinical, regulatory, 
commercial, and other risks that must be overcome to achieve the particular milestone in making this assessment. There is considerable judgment involved 
in determining whether it is probable that a significant reversal of cumulative revenue would not occur. At the end of each subsequent reporting period, we 
reevaluate the probability of achievement of all milestones subject to constraint and, if necessary, adjusts its estimate of the overall transaction price. Any 
such adjustments are recorded on a cumulative catch-up basis, which would affect revenues and earnings in the period of adjustment.

Accrued research and development expenses 

As part of the process of preparing financial statements, we are required to estimate and accrue research and development expenses. This process 

involves the following: 

•

•

•

communicating with our applicable personnel to identify services that have been performed on our behalf and estimating the level of service 
performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual cost; 

estimating and accruing expenses in our consolidated financial statements as of each balance sheet date based on facts and circumstances 
known to us at the time; and 

periodically confirming the accuracy of our estimates with selected service providers and making adjustments, if necessary. 

Examples of estimated research and development expenses that we accrue include: 

•

•

•

fees paid to investigative sites in connection with clinical studies; 

fees paid to contract manufacturing organizations in connection with non-clinical development, preclinical research, and the production of 
clinical study materials; and 

professional service fees for consulting and related services. 

We base our expense accruals related to non-clinical development, preclinical studies, and clinical trials on our estimates of the services received 
and efforts expended pursuant to contracts with organizations/consultants that conduct and manage clinical studies on our behalf. The financial terms of 
these agreements vary from contract to contract and may result in uneven payment flows. Payments under some of these contracts may depend on many 
factors, such as the successful enrollment of patients, site initiation, and the completion of clinical study milestones.

Our service providers invoice us monthly in arrears for services performed. In accruing service fees, we estimate the time period over which services 

will be performed and the level of effort to be expended in each period. If we do not identify costs that we have begun to incur, or if we underestimate or 
overestimate the level of services performed or the costs of these services, our actual expenses could differ from our estimates. To date, we have not 
experienced significant changes in our estimates of accrued research and development expenses after a reporting period. However, due to the nature of 
estimates, we cannot assure you that we will not make changes to our estimates in the future as we become aware of additional information about the status 
or conduct of our clinical trials and other research activities.

93

 
 
Stock-Based Compensation 

Stock options

We recognize compensation costs related to awards granted to employees and directors, based on the estimated fair value of the awards on the date 

of grant. For stock options, we estimate the grant date fair value, and the resulting stock-based compensation, using the Black-Scholes option-pricing 
model. The grant date fair value of the stock-based awards is recognized on a straight-line basis over the requisite service period, which is generally the 
vesting period of the respective awards. 

The Black-Scholes option-pricing model requires the use of subjective assumptions to determine the fair value of stock options. These key 

subjective assumptions include: 

•

•

Expected term—The expected term represents the period that stock options are expected to be outstanding. The expected term is determined 
using the simplified method. The simplified method deems the expected term to be the midpoint between the vesting date and the contractual 
life of the stock options. 

Expected volatility— We completed our IPO in June 2019 and accordingly, we lack sufficient company-specific historical and implied 
volatility information for our shares traded in the public markets commensurate with the expected term of our stock options. Therefore, we 
estimate our expected share price volatility based on a blend of our historical volatility and the historical volatility of publicly traded peer 
companies and expect to continue to do so until such time as we have adequate historical data regarding the volatility of our own traded share 
price. The comparable companies were chosen based on their similar size, stage in the life cycle or area of specialty. 

The following table presents the weighted-average assumptions used to estimate the fair value of share-based awards granted: 

Risk-free interest rate
Expected dividend yield
Expected life
Expected volatility

Year ended December 31,

2023

3.57-3.94%  
0%  
5.5-6.25 years  
70-73%  

2022
1.82-4.15%
0%
5.5-6.25 years
70-71%

We will continue to use judgment in evaluating the assumptions utilized for the grant-date fair value of our stock options on a prospective basis. 

Other Information 

Net operating loss carryforwards 

As of December 31, 2023, and 2022, the Company had federal NOL carryforwards of $189.5 million and $210.9 million, respectively, which may 

be available to reduce future taxable income. Federal NOLs generated prior to December 31, 2018 expire at various dates beginning in 2035 and NOLs 
generated after December 31, 2018 carryforward indefinitely. As of December 31, 2023, and 2022, the Company had state NOLs of $199.4 million and 
$212.8 million, respectively, which may be available to reduce future taxable income. The state NOLs expire at various dates beginning in 2035. 

In accordance with ASC 740, Accounting for Income Taxes, management of the Company has evaluated the positive and negative evidence bearing 

upon the realizability of its deferred tax assets and has determined that it is more likely than not that the Company will not recognize the net benefits of 
federal and state deferred tax assets. A full valuation allowance of $133.3 million and $97.9 million was established at December 31, 2023 and 2022, 
respectively. The change in the valuation allowance was an increase of $35.4 million and $31.8 million in 2023 and 2022, respectively.

As of December 31, 2023 and 2022, the Company had federal research and development tax credit (“R&D Credit”) carryforwards of $12.8 million 

and $9.2 million, respectively, and state R&D Credit carryforwards of $5.9 million and $4.3 million, respectively. Both federal and state R&D Credit 
carryforwards may be available to reduce future tax liabilities and expire at various dates beginning in 2034.

94

 
 
 
 
 
 
 
 
 
 
 
 
 
The Internal Revenue Code of 1986, as amended (“IRC”), provides for a limitation of the annual use of NOLs, R&D Credits, and other tax attributes 

following certain ownership changes that could limit our ability to utilize NOL and R&D Credit carryforwards. Under IRC Sections 382 and 383 an 
ownership change is generally defined as a greater than 50% change (by value) in its equity ownership over a three-year period. The Company has 
experienced ownership changes in the past and based on the existing Section 382 limitations, $0.9 million and $0.02 million of existing Federal NOLs and 
R&D credits, respectively, will not be utilizable. The Company may experience additional ownership changes in the future because of subsequent shifts in 
our stock ownership. As a result, our ability to use our pre-change NOLs to offset taxable income, if any, is subject to limitations, which could potentially 
result in increased future tax liability. In addition, at the state level, there may be periods during which the use of NOLs is suspended or otherwise limited, 
which could accelerate or permanently increase state taxes owed.

Emerging Growth Company and Smaller Reporting Company Status 

We are an “emerging growth company,” as defined in the Jumpstart our Business Startups Act of 2012, or the JOBS Act. Under the JOBS Act, 
emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as 
those standards apply to private companies. 

We have elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for 

public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of 
the extended transition period provided in the JOBS Act. 

As a result, our consolidated financial statements may not be comparable to companies that comply with new or revised accounting pronouncements 

as of public company effective dates. 

We will remain an emerging growth company until the earliest of (i) the last day of our first fiscal year (a) following the fifth anniversary of the 
completion of our IPO, (b) in which we have total annual gross revenues of at least $1.235 billion, or (c) when we are deemed to be a large accelerated 
filer, which means the market value of our common stock that is held by non-affiliates exceeds $700.0 million as of the prior June 30th, and (ii) the date on 
which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period. We anticipate ceasing to be an emerging 
growth company as of December 31, 2024, which is the last day of our fiscal year following the fifth anniversary of the completion of our IPO.

We are also a “smaller reporting company,” meaning that the market value of our stock held by non-affiliates was less than $700.0 million and our 
annual revenue is less than $100.0 million during the most recently completed fiscal year. We will continue to be a smaller reporting company for so long 
as either (i) the market value of our stock held by non-affiliates is less than $250.0 million or (ii) our annual revenue is less than $100.0 million during the 
most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700.0 million. If we are a smaller reporting 
company at the time we cease to be an emerging growth company, we may continue to rely on exemptions from certain disclosure requirements that are 
available to smaller reporting companies. Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of 
audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth companies, smaller reporting companies have reduced 
disclosure obligations regarding executive compensation. 

Recently Issued Accounting Pronouncements 

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 
2023-07”), which expands disclosures about a public entity’s reportable segments and requires more enhanced information about a reportable segment’s 
expenses, interim segment profit or loss, and how a public entity’s chief operating decision maker uses reported segment profit or loss information in 
assessing segment performance and allocating resources. The standard is effective for annual reporting periods beginning after December 15, 2023, and 
interim periods within years beginning after December 15, 2024, with early adoption permitted. The Company is currently assessing the impact that the 
adoption will have on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). ASU 
2023-09 requires that an entity disclose specific categories in the effective tax rate reconciliation as well as provide additional information for reconciling 
items that meet a quantitative threshold and certain disclosures of state versus federal income tax expenses and taxes paid. ASC 2023-09 is effective for 
fiscal years beginning after December 15, 2024. The Company does not expect the adoption of ASU 2023-09 to have a material impact on its consolidated 
financial statements and will adopt the standard effective January 1, 2025.

95

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

Interest rate risk

We are exposed to market risks in the ordinary course, primarily including interest sensitivities. As of December 31, 2023, we had cash, cash 
equivalents and marketable securities of $201.4 million and $229.6 million as of December 31, 2022. Our primary exposure to market risk is interest rate 
sensitivity, which is affected by changes in the general level of U.S. interest rates. Because of the short-term maturities of our cash and cash equivalents, we 
do not believe that an immediate 10% increase in interest rates would have any significant impact on the realized value of our investments. Accordingly, we 
do not believe we are exposed to material market risk with respect to our cash and cash equivalents.

Inflation risk

Inflation generally affects us by increasing our clinical trial costs. We do not believe that inflation has had a material effect on our business, financial 

condition or results of operations during the years ended December 31, 2023 and 2022.

Item 8. Financial Statements and Supplementary Data. 

The financial statements required to be filed pursuant to this Item 8 are appended to this report. An index of those financial statements is found in 

Item 15 of Part IV of this Annual Report on Form 10-K.

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures. 

Management’s Evaluation of Disclosure Controls and Procedures 

Under the supervision and with the participation of our management, including our Chief Financial Officer (Our principal accounting officer) and 

Chief Executive Officer (Our principal executive officer), we evaluated the effectiveness of the design and operation of our disclosure controls and 
procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (Exchange Act)) as of December 31, 
2023. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other 
procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the 
Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and 
procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports 
that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and 
principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. Management recognizes that any controls and 
procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily 
applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on our management’s evaluation (with the 
participation of our Chief Executive Officer and our Chief Financial Officer), as of the end of the period covered by this report, our Chief Executive Officer 
and our Chief Financial Officer have concluded that our disclosure controls and procedures were effective at the reasonable assurance level.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rule 13a-15(f) of 

the Exchange Act. Management assessed the effectiveness of our internal control over financial reporting as of December 31, 2023. In making this 
assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal 
Control—Integrated Framework issued in 2013. Based upon the assessments, management has concluded that as of December 31, 2023 our internal control 
over financial reporting was effective to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial 
statements in accordance with GAAP.

96

 
 
 
 
This Annual Report on Form 10-K does not include an attestation report from our independent registered public accounting firm due to a transition 

period established by the rules of the Securities and Exchange Commission for newly public companies. Additionally, for so long as we remain an 
“emerging growth company” under the JOBS Act or a “smaller reporting company,” our independent registered public accounting firm is not required to 
attest to the effectiveness of our internal control over financial reporting.

Changes in Internal Control over Financial Reporting 

There has been no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act) during 

three months ended December 31, 2023 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting. 

Inherent Limitations on Effectiveness of Controls

Internal control over financial reporting may not prevent or detect all errors and all fraud. Any controls and procedures, no matter how well designed 

and operated, can provide only reasonable assurance of achieving the desired control objective and management necessarily applies its judgment in 
evaluating the cost-benefit relationship of possible controls and procedures.

Item 9B. Other Information. 

Trading Arrangements

During the three months ended December 31, 2023, none of our directors or officers, as defined in Rule 16a-1(f), informed us of the adoption, 
modification or termination of a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Regulation S-
K, Item 408, except as described in the table below:

Name

Title

Action

Date

Rule 
10b5-1*  

Non Rule 
10b5-1**

Total Shares to 
be Sold

Expiration 
Date

(1)

 Jonathan Allan

 Jonathan Allan
 Edward Kaye

 Huw Nash

 Huw Nash

 General Counsel and Corporate 
Secretary
 General Counsel and Corporate 
Secretary

   Chief Executive Officer

 Chief Operating Officer & Chief 
Business Officer
 Chief Operating Officer & Chief 
Business Officer

 Termination(2)  

12/6/2023    X

43,896    

3/20/2024

 Adoption
 Adoption

12/15/2023    X
12/26/2023    X

16,065    
45,000    

12/15/2024
3/20/2025

 Termination(3)  

12/29/2023    X

631,450    

6/1/2024

 Adoption

12/29/2023    X

670,338    

4/1/2025

* Intended to satisfy the affirmative defense of Rule 10b5-1(c) Act.

** Not intended to satisfy the affirmative defense of Rule 10b5-1(c) Act. 

(1) Except as indicated by footnote, each trading arrangement permitted or permits transactions through and including the earlier to occur of (a) the 
completion of all purchases or sales or (b) the date listed in the table. 

(2) On December 6, 2023, Jonathan Allan, General Counsel and Corporate Secretary, terminated a trading arrangement that was intended to satisfy the 
affirmative defense of Rule 10b5-1 (the “Allan 10b5-1 Plan”). The Allan 10b5-1 Plan was entered into on March 22, 2023, with an expiration date of 
March 20, 2024.

(3) On December 29, 2023, Huw Nash, COO and CBO, terminated a trading arrangement that was intended to satisfy the affirmative defense of Rule 10b5-
1 (the “Nash 10b5-1 Plan”). The Nash 10b5-1 Plan was entered into on March 28, 2022, with an expiration date of June 1, 2024.

Each new Rule 10b5-1 Plan that was adopted in the above table includes a representation from Messrs. Allan, Kaye and Nash, respectively, to the 
broker administering the plan that he was not in possession of any material nonpublic information regarding the Company or the securities subject to the 
Rule 10b5-1 Plan at the time the Rule 10b5-1 Plan was entered into. A similar representation was made to us in connection with the adoption of the Rule 
10b5-1 Plan under our insider trading policy. Those representations were made as of the Adoption Date set forth above, and speak only as of that date. In 
making those representations, there is no assurance with respect to any material nonpublic information of which the 

97

 
 
 
 
 
 
 
 
 
 
   
 
 
 
     
 
 
 
 
     
 
 
 
     
 
 
 
     
 
 
 
 
     
 
 
directors and officers was unaware, or with respect to any material nonpublic information acquired by the above directors and officers or passage after the 
date of the representation. 

Once executed, transactions under a Rule 10b5-1 Plan adopted during the period described above will be disclosed publicly through Form 4 and/or 

Form 144 filings with the SEC in accordance with applicable securities laws, rules, and regulations. Except as may be required by law, we do not undertake 
any obligation to update or report any modification, termination, or other activity under current or future Rule 10b5-1 plans that may be adopted by Messrs. 
Allan, Kaye or Nash, respectively, or other officers or directors of the Company.

Item 9C. Disclosure Regarding Foreign Jurisdictions That Prevent Inspections.

None.

98

 
 
 
Item 10. Directors, Executive Officers and Corporate Governance. 

PART III 

The information required by this Item 10 will be included in our Definitive Proxy Statement to be filed with the Securities and Exchange 

Commission, or SEC, with respect to our 2024 Annual Meeting of Stockholders and is incorporated herein by reference.

We have adopted a Code of Conduct that applies to all of our officers, directors, and employees, including our principal executive officer, principal 

financial officer, principal accounting officer, and controller, or persons performing similar functions, which is posted on our website. Our Code of Conduct 
is a “code of ethics,” as defined in Item 406(b) of Regulation S-K. We will make any legally required disclosures regarding amendments to, or waivers of, 
provisions of our Code of Conduct on our website. The information contained on, or accessible from, our website is not part of this Annual Report on Form 
10-K by reference or otherwise.

Item 11. Executive Compensation. 

The information required by this Item 11 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2024 

Annual Meeting of Stockholders 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 12 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2024 

Annual Meeting of Stockholders and is incorporated herein by reference. 

Item 13. Certain Relationships and Related Transactions, and Director Independence. 

The information required by this Item 13 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2024 

Annual Meeting of Stockholders and is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services. 

The information required by this Item 14 will be included in our Definitive Proxy Statement to be filed with the SEC with respect to our 2024 

Annual Meeting of Stockholders and is incorporated herein by reference. 

99

 
 
PART IV 

Item 15. Exhibits, Financial Statement Schedules. 

(a) The following documents are filed as a part of this Form 10-K:

Financial Statements

Our consolidated financial statements are listed in the “Index to Consolidated Financial Statements” under Part II, Item 8 of this Form 10-K.

Financial Statement Schedules

Financial statement schedules not listed have been omitted because they are not applicable, or the required information is shown in the consolidated 

financial statements or notes thereto.

Exhibits

Exhibit
Number

Description

Form

File No.

Exhibit
Filing Date

  Exhibit

No.

Filed/Furnished
Herewith

  3.1

  Restated Certificate of Incorporation, as amended.

  3.2

  Restated Bylaws, as amended.

8-K  

001-38938

February 3, 
2023

3.1

  4.1

  Form of Common Stock Certificate. 

  S-1

  333-231700  

June 7, 2019

4.1

  4.2

  Description of Common Stock Registered Under Section 12 of 

the Securities Exchange Act of 1934.

#
  4.3

  Registration Rights Agreement, by and among the Registrant, 
Blue Horizon Enterprise Ltd. and Ezbon International Limited, 
dated May 3, 2023.

  10Q  

001-38938

  May 4, 2023

4.1

X

X

 10.1*

  Form of Indemnification Agreement with directors and officers.

  S-1

  333-231700  

June 7, 2019

10.1

 10.2*

  2014 Equity Incentive Plan, as amended, and forms of award 

  S-1

  333-231700   May 23, 2019  

10.2

agreements.

 10.3*

  2019 Equity Incentive Plan, and forms of award agreements.

  10-K  

001-38938

  March 6, 2023  

10.3

 10.4*

  2019 Employee Stock Purchase Plan, and forms of award 

  S-1

  333-231700  

June 7, 2019

10.5

agreements.

10.5*

  2023 Inducement Plan, and forms of award agreements.

  S-8

  333-271273   April 13, 2023  

99.1

10.6*

  Amended and Restated Executive Employment Agreement, by 

  10-Q  

001-38938

and between the Registrant and Edward M. Kaye, effective as of 
October 21, 2020.

10.7*

  Amended and Restated Executive Employment Agreement, by 

  10-Q  

001-38938

and between the Registrant and Stephen J. Tulipano, effective as 
of October 21, 2020.

  November 12, 
2020

10.1

  November 12, 
2020

10.2

10.8*

  Amended and Restated Executive Employment Agreement, by 
and between the Registrant and Barry Ticho, effective as of 
October 21, 2020.

  10-K  

001-38938

  March 9, 2021  

10.7

100

 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number

Description

Form

File No.

Exhibit
Filing Date

  Exhibit

No.

Filed/Furnished
Herewith

10.9*

  Change of Control and Severance Agreement, by and between 

  10-Q  

001-38938

the Registrant and Edward M. Kaye, effective as of October 21, 
2020.

  November 12, 
2020

10.4

10.10*

  Change of Control and Severance Agreement, by and between 
the Registrant and Stephen J. Tulipano, effective as of October 
21, 2020.

  10-Q  

001-38938

  November 12, 
2020

10.5

  10.11*   Change of Control and Severance Agreement, by and between 

  10-K  

001-38938

  March 9, 2021   10.10  

the Registrant and Barry Ticho, effective as of October 21, 2020.

10.12

  Lease Agreement, dated as of September 8, 2021, by and 

between ARE-MA Region No. 24, LLC and the Registrant, as 
amended to date.

10.13

10.14

10.15†

  Lease Agreement, by and between MIT 139 Main Street 
Leasehold LLC, and the Registrant., as amended to date.

  Scientific Advisory Board Agreement by and between the 
Registrant and Adrian Krainer, Ph.D., dated June 1, 2022.

  License and Collaboration Agreement, dated as of January 9, 
2022, by and between Acadia Pharmaceuticals Inc. and the 
Registrant.

  10-Q  

001-38938

  August 10, 2021  

10.1

  10-Q  

001-38938

  August 8, 2022  

10.1

  10-Q  

001-38938

  May 10, 2022  

10.1

10.16

  Controlled Equity Offering Sales Agreement, dated as of May 
20, 2022, between the Registrant and Cantor Fitzgerald & Co..

S-3

  333-265107   May 20, 2022  

1.2

21.1

  Subsidiary of the Registrant.

S-1

  333-231700   May 23, 2019  

21.1

23.1

  Consent of independent registered public accounting firm.

31.1

31.2

  Certification of Principal Executive Officer Pursuant to Rules 
13a-14(a) and 15d-14(a) under the Securities Exchange Act of 
1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley 
Act of 2002.

  Certification of Principal Executive Officer Pursuant to Rules 
13a-14(a) and 15d-14(a) under the Securities Exchange Act of 
1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley 
Act of 2002.

    32.1**   Certification of Principal Financial Officer Pursuant to 18 U.S.C. 

Section 1350, as Adopted Pursuant to Section 906 of the 
Sarbanes-Oxley Act of 2002.

    32.2**   Certification of Principal Financial Officer Pursuant to 18 U.S.C. 

Section 1350, as Adopted Pursuant to Section 906 of the 
Sarbanes-Oxley Act of 2002.

97

  Compensation Recovery Policy

101.INS   Inline XBRL Instance Document.

101.SCH   Inline XBRL Taxonomy Extension Schema Document.

101

X

X

X

X

X

X

X

X

X

 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
101.CAL   Inline XBRL Taxonomy Extension Calculation Linkbase 

Description

Document.

101.DEF   Inline XBRL Taxonomy Extension Definition Linkbase 

Document.

101.LAB   Inline XBRL Taxonomy Extension Label Linkbase Document.

101.PRE   Inline XBRL Taxonomy Extension Presentation Linkbase 

Document.

104

  Inline Cover Page Interactive Data File (formatted as inline 

XBRL and contained in Exhibit 101).

Form

File No.

Exhibit
Filing Date

  Exhibit

No.

Filed/Furnished
Herewith
X

X

X

X

X

† Registrant has omitted certain portions of the exhibit pursuant to Item 601(b)(10) of Regulation S-K.
* Indicates a management contract or compensatory plan or arrangement in which directors or executive officers are eligible to participate. 
** The certifications furnished in Exhibits 32.1 and 32.2 hereto are deemed to accompany this Form 10-K and are not deemed “filed” for purposes of 
Section 18 of the Exchange Act, or otherwise subject to the liability of that section, nor shall they be deemed incorporated by reference into any filing under 
the Securities Act or the Exchange Act.
# Registrant has omitted schedules and exhibits pursuant to Item 601(a)(5) of Regulation S-K. The Registrant agrees to furnish supplementally a copy of 
the omitted schedules and exhibits to the SEC upon request.

Item 16. Form 10-K Summary

None.

102

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Annual 

Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 25, 2024

By:

/s/ Edward M. Kaye, M.D.
Edward M. Kaye, M.D.
Chief Executive Officer

STOKE THERAPEUTICS, INC. 

POWER OF ATTORNEY

Each person whose individual signature appears below hereby authorizes and appoints Edward M. Kaye and Stephen J. Tulipano, and each of them, 

with full power of substitution and re-substitution and full power to act without the other, as his or her true and lawful attorney-in-fact and agent to act in 
his or her name, place and stead and to execute in the name and on behalf of each person, individually and in each capacity stated below, and to file any and 
all amendments to this Annual Report on Form 10-K and to file the same, with all exhibits thereto, and other documents in connection therewith, with the 
Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each 
and every act and thing, ratifying and confirming all that said attorneys-in-fact and agents or any of them or their or his substitute or substitutes may 
lawfully do or cause to be done by virtue thereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Annual Report on Form 10-K has been signed below by the 

following persons on behalf of the Registrant in the capacities and on the dates indicated.

103

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Name

/s/ Edward M. Kaye

Edward M. Kaye, M.D.

/s/ Stephen J. Tulipano
Stephen J. Tulipano

/s/ Julie A. Smith

Julie A. Smith

/s/ Seth L. Harrison

Seth L. Harrison, M.D.

/s/ Adrian R. Krainer

Adrian R. Krainer, Ph.D.

/s/ Arthur A. Levin

Arthur A. Levin, Ph.D.

/s/ Arthur O. Tzianabos

Arthur O. Tzianabos, Ph.D. 

/s/ Jennifer C. Burstein

Jennifer C. Burstein

/s/ Garry E. Menzel
Garry E. Menzel

/s/ Ian F. Smith
Ian F. Smith

Title

Chief Executive Officer and Director

(Principal Executive Officer)

Chief Financial Officer
(Principal Financial and Accounting Officer)

Director

Director

Director

Director

Director

Director

Director

Director

104

Date

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

March 25, 2024

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
STOKE THERAPEUTICS, INC.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of independent registered public accounting firm

Consolidated balance sheets

Consolidated statements of operations and comprehensive loss

Consolidated statements of stockholders’ equity 

Consolidated statements of cash flows

Notes to consolidated financial statements

105

Page

106

107

108

109

110

111

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Report of independent registered public accounting firm 

To the Stockholders and the Board of Directors
Stoke Therapeutics, Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Stoke Therapeutics, Inc. and subsidiary (the Company) as of December 31, 2023 and 
2022, the related consolidated statements of operations and comprehensive loss, stockholders’ equity, and cash flows for the years then ended, and the 
related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material 
respects, the financial position of the Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for the years then 
ended, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these 
consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board 
(United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the 
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not 
required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain 
an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal 
control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or 
fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and 
disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by 
management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis 
for our opinion

/s/ KPMG LLP

We have served as the Company’s auditor since 2019.

Boston, Massachusetts
March 25, 2024

106

 
 
Stoke Therapeutics, Inc. and subsidiary
Consolidated balance sheets 
(in thousands, except share and per share amounts) 

Assets
Current assets:

Cash and cash equivalents
Marketable securities
Prepaid expenses
Other current assets
Interest receivable

Total current assets

Restricted cash
Operating lease right-of-use assets
Property and equipment, net

Total assets

Liabilities and stockholders’ equity
Current liabilities:

Accounts payable
Accrued and other current liabilities
Deferred revenue - current portion

Total current liabilities

Deferred revenue - net of current portion
Other long term liabilities

Total long term liabilities
Total liabilities

Commitments and contingencies (Note 7)
Stockholders’ equity

Common stock, par value of $0.0001 per share; 300,000,000 shares authorized, 45,918,233 and 
39,439,575 shares issued and outstanding as of December 31, 2023 and 2022, respectively
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit

Total stockholders’ equity

Total liabilities and stockholders’ equity

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

107

As of December 31,

2023

2022

191,442     $
9,952    
11,320    
2,561    
64    
215,339     $
569    
6,611    
5,823    
228,342     $

1,695     $
13,815    
15,309    
30,819     $
33,074    
4,884    
37,958     $
68,777     $

5    
561,433    
(24 )  
(401,849 )  
159,565     $
228,342     $

113,556  
116,039  
10,932  
2,955  
588  
244,070  
569  
4,753  
6,675  
256,067  

766  
15,748  
14,880  
31,394  
36,856  
2,968  
39,824  
71,218  

4  
483,170  
(1,175 )
(297,150 )
184,849  
256,067  

  $

  $

  $

  $

  $

  $
  $

  $
  $

 
 
 
 
 
 
 
   
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
Stoke Therapeutics, Inc. and subsidiary
Consolidated statements of operations and comprehensive loss 
(in thousands, except share and per share amounts) 

Revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense):

Interest income (expense), net
Other income (expense), net

Total other income (expense)

Net loss
Net loss per share—basic and diluted
Weighted average common shares outstanding—basic and diluted

Comprehensive loss:
Net loss
Other comprehensive loss:
Unrealized gain (loss) on marketable securities
Total other comprehensive gain (loss)

Comprehensive loss

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

108

Year Ended
December 31,

2023

2022

  $

8,780     $

12,405  

82,231    
41,322    
123,553    
(114,773 )  

9,908    
166    
10,074    
(104,699 )   $
(2.38 )   $

43,994,862    

77,837  
38,924  
116,761  
(104,356 )

3,122  
167  
3,289  
(101,067 )
(2.60 )
38,897,442  

(104,699 )   $

(101,067 )

1,151    
1,151     $
(103,548 )   $

(1,007 )
(1,007 )
(102,074 )

  $
  $

  $

  $
  $

 
 
 
 
 
 
 
   
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
 
 
 
Stoke Therapeutics, Inc. and subsidiary
Consolidated statements of stockholders’ equity 
(in thousands, except share and per share amounts) 

Balance as of December 31, 2021

Unrealized loss on marketable securities
Stock-based compensation
Issuance of common stock upon exercise of stock 
options
Issuance of common stock related to employee 
stock purchase plan
Shares sold as part of controlled equity offering 
sales agreement
Net loss

Balance as of December 31, 2022

Unrealized gain on marketable securities
Stock-based compensation
Issuance of common stock upon exercise of stock 
options
Issuance of common stock related to employee 
stock purchase plan
Shares sold as part of controlled equity offering 
sales agreement
Net loss

Balance as of December 31, 2023

Common Stock

Shares
36,902,499  
—  
—  

  $

269,288  

44,002  

2,223,786  
—  
39,439,575  

  $

—  
—  

148,211  

71,471  

6,258,976  
—  
45,918,233  

  $

Additional
paid-in

Accumulated Other 
Comprehensive

Accumulated

Amount

capital

Gain (Loss)

deficit

Total
Stockholders’
equity

4  
—  
—  

—  

—  

—  
—  
4  

—  
—  

—  

—  

1  
—  
5  

  $

414,024  

  $
—      
22,854      

(168 )   $
(1,007 )    
—      

(196,083 )   $
—      
—      

217,777  
(1,007 )
22,854  

  $

494      

570      

45,228      
—      
483,170     $
—      
25,257      

371      

555      

52,080      
—      
561,433     $

  $

—      

—      

—      

—      

494  

570  

—      
—      
(1,175 )   $
1,151      
—      

—      
(101,067 )    
(297,150 )   $
—      
—      

45,228  
(101,067 )
184,849  

1,151  
25,257  

—      

—      

—      
—      
(24 )   $

—      

—      

371  

555  

—      
(104,699 )    
(401,849 )   $

52,081  
(104,699 )
159,565  

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

109

 
 
 
 
   
   
   
   
 
 
 
   
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Stoke Therapeutics, Inc. and subsidiary
Consolidated statements of cash flows 
(in thousands) 

Cash flows from operating activities:

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

Depreciation
Amortization and accretion of marketable securities
Stock-based compensation
Loss on disposal of property and equipment
Reduction in the carrying amount of right of use assets
Changes in assets and liabilities:

Prepaid expenses and other current assets
Accounts payable, accrued liabilities, and operating leases
Deferred revenue

Net cash used in operating activities

Cash flows from investing activities:

Purchases of property and equipment
Purchases of marketable securities
Sales of marketable securities

Net cash provided by (used in) investing activities

Cash flows from financing activities:

Proceeds from issuance of common stock upon exercise of stock options
Proceeds from Employee Stock Purchase Plan
Proceeds from controlled equity offering sales agreement
Other

Net cash provided by financing activities

Net increase (decrease) in cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash—beginning of year
Cash, cash equivalents and restricted cash—end of year

Supplemental Disclosure of Non-Cash Investing and Financing Activities:

Right-of-use assets recognized in exchange for operating leases

Property and equipment included in accrued expense and accounts payable

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

110

Year Ended December 31,

2023

2022

  $

(104,699 )   $

(101,067 )

2,469    
(325 )  
25,257    
1    
2,260    

529    
(3,208 )  
(3,351 )  
(81,067 )  

(1,616 )  
—    
107,562    
105,946    

371    
555    
52,081    
—    
53,007    
77,886    
114,125    
192,011     $

1,546  
(211 )
22,854  
—  
1,989  

(5,183 )
(3,530 )
51,736  
(31,866 )

(3,962 )
(201,320 )
159,400  
(45,882 )

494  
570  
45,344  
1  
46,409  
(31,339 )
145,464  
114,125  

4,118  

—  

  $

  $

1,802  

121  

  $

  $
  $

 
 
 
 
 
 
 
   
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
     
   
 
Stoke Therapeutics, Inc. and subsidiary 
Notes to consolidated financial statements 
(in thousands, except share and per share amounts) 

1. Nature of the business and basis of presentation 

Organization 

Stoke Therapeutics, Inc. (the Company) was founded in June 2014 and was incorporated under the laws of the State of Delaware. The Company is 

an early-stage biopharmaceutical company pioneering a new way to treat the underlying causes of severe genetic diseases by precisely upregulating protein 
expression. 

Shelf Registration

In May 2022, the Company filed a universal Shelf Registration statement on Form S-3 (the “Registration Statement”) with the SEC. The 

Registration Statement was declared effective by the SEC on May 31, 2022, and contains two prospectuses: a base prospectus, which covers the offering, 
issuance and sale by the Company of up to a maximum aggregate offering price of $400.0 million of its common stock, preferred stock, debt securities, 
warrants to purchase common stock, preferred stock or debt securities, subscription rights to purchase common stock, preferred stock or debt securities 
and/or units consisting of some or all of these securities; and a sales agreement prospectus covering the offering, issuance and sale by the Company of up to 
a maximum aggregate offering price of $150.0 million of its common stock that may be issued and sold under a Controlled Equity Offering Sales 
Agreement (“Sales Agreement”). The specific terms of any securities to be offered pursuant to the base prospectus will be specified in a prospectus 
supplement to the base prospectus. The $150.0 million of common stock that may be offered, issued and sold under the sales agreement prospectus is 
included in the $400.0 million of securities that may be offered, issued and sold by the Company under the base prospectus. As of December 31, 2023, the 
Company had issued approximately 6.3 million shares of common stock pursuant to the Sales Agreement for net proceeds of $52.1 million. Since 
December 31, 2023, through the date of the issuance of these consolidated financial statements, the Company sold approximately 0.2 million shares of 
common stock and received $1.3 million after deducting commissions related to the Sales Agreement. The Company may terminate this at-the-market 
program at any time, pursuant to its terms. 

Uncertainties 

The Company is subject to risks and uncertainties common to early-stage companies in the biotechnology industry including, but not limited to, 

development by competitors of new technological innovations, dependence on key personnel, protection of proprietary technology, compliance with 
government regulations and ability to secure additional capital to fund operations. Product candidates currently under development will require significant 
additional research and development efforts, including extensive preclinical and clinical testing and regulatory approval prior to commercialization. These 
efforts require significant amounts of additional capital, adequate personnel and infrastructure and extensive compliance-reporting capabilities. Even if the 
Company’s product development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales. 

Liquidity 

The Company expects that its operating losses and negative cash flows will continue for the foreseeable future. As of the issuance date of these 
consolidated financial statements, the Company expects that its cash, cash equivalents, marketable securities and restricted cash will be sufficient to fund its 
operating expenses and capital expenditure requirements through at least twelve months from the issuance date of these consolidated financial statements.

2. Summary of significant accounting policies and recent accounting pronouncements 

Basis of presentation and consolidation 

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP), 
and include the accounts of Stoke Therapeutics, Inc. and its wholly-owned subsidiary. Any reference in these notes to applicable guidance is meant to refer 
to GAAP as found in the Accounting Standards Codification (“ASC”) and Accounting Standards Update (“ASU”) of the Financial Accounting Standards 
Board (“FASB”). All intercompany transactions between and among the Company and its consolidated subsidiary have been eliminated. 

111

 
 
Use of estimates 

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect 
the reported amounts of assets, liabilities, equity, expenses and disclosure of contingent assets and liabilities. Estimates are periodically reviewed in light of 
changes in circumstances, facts and experience. Actual results could differ from those estimates. 

Cash and cash equivalents 

The Company considers all highly liquid investments with an original maturity of three months or less at the date of purchase to be cash equivalents. 

The Company deposits its cash in checking, sweep and money market accounts. 

Restricted cash 

At December 31, 2023, restricted cash consisted of money market accounts collateralizing letters of credit issued as security deposits in connection 

with the Company’s leases of its corporate facilities. 

The following table reconciles cash and cash equivalents and restricted cash per the consolidated balance sheets to the statements of cash flows: 

Cash and cash equivalents
Restricted cash

As of December 31,

2023

2022

  $

  $

191,442     $
569    
192,011     $

113,556  
569  
114,125  

Marketable Securities 

Marketable securities consist of government securities and obligations, corporate bonds and commercial paper with original maturities of more than 

90 days at the purchase date. Investments are classified as available-for-sale and are recorded on the balance sheet at fair value with unrealized gains or 
losses reported as a separate component of other comprehensive income/(loss). Management determines the appropriate classification of its investments at 
the time of purchase and reevaluates such determination at each balance sheet date.

Concentration of credit risk 

Financial instruments that potentially expose the Company to concentrations of credit risk primarily consist of cash, cash equivalents and marketable 

securities. The Company maintains its cash, cash equivalents and marketable securities at accredited financial institutions in amounts that exceed federally 
insured limits. The Company does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking 
relationships. 

Fair value of financial instruments 

ASC Topic 820, Fair Value Measurement (ASC 820), establishes a fair value hierarchy for instruments measured at fair value that distinguishes 

between assumptions based on market data (observable inputs) and the Company’s own assumptions (unobservable inputs). Observable inputs are those 
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. ASC 820 identifies fair value as the exchange price, or exit price, representing the 
amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As a basis for considering 
market participant assumptions in fair value measurements, ASC 820 establishes a three-tier value hierarchy that distinguishes between the following: 

Level 1—Quoted market prices in active markets for identical assets or liabilities. 

Level 2—Inputs other than Level 1 inputs that are either directly or indirectly observable, such as quoted market prices, interest rates and yield 

curves. 

Level 3—Unobservable inputs developed using estimates of assumptions developed by the Company, which reflect those that a market participant 

would use. 

112

 
 
 
 
 
 
 
   
 
 
 
 
 
 
To the extent the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair values 
requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized as 
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. 

Revenue recognition

The Company recognizes revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”). This standard applies 

to all contracts with customers, except for contracts that are within the scope of other standards. Under ASC 606, an entity recognizes revenue when its 
customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for 
those goods or services.

In January 2022, the Company entered into a license and collaboration agreement with Acadia Pharmaceuticals, Inc. (“Acadia”) which is within the 

scope of ASC 606 (see Note 8). In determining the appropriate amount of revenue to be recognized as it fulfills its obligations under this agreement, the 
Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised 
goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, 
including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue 
when (or as) the Company satisfies each performance obligation. As part of the accounting for this agreement, the Company must use its judgment to 
determine: (a) the number of performance obligations based on the determination under step (ii) above; (b) the transaction price under step (iii) above; (c) 
the stand-alone selling price for each performance obligation identified in the contract for the allocation of transaction price in step (iv) above; and (d) the 
contract term and pattern of satisfaction of the performance obligations under step (v) above. The Company uses judgment to determine whether milestones 
or other variable consideration, except for royalties, should be included in the transaction price. The transaction price is allocated to each performance 
obligation on a relative stand-alone selling price basis, for which the Company recognizes revenue as or when the performance obligations under the 
contract are satisfied.

Amounts due to the Company for satisfying the revenue recognition criteria or that are contractually due based upon the terms of the collaboration 

agreement are recorded as accounts receivable in the Company’s consolidated balance sheets. Amounts received prior to satisfying the revenue recognition 
criteria are recorded as deferred revenue in the Company’s consolidated balance sheets. Amounts expected to be recognized as revenue within the 12 
months following the balance sheet date are classified as current deferred revenue. Amounts not expected to be recognized as revenue within the 12 months 
following the balance sheet date are classified as deferred revenue, net of current portion.

Upfront license fees

The licenses of the Company’s intellectual property granted to Acadia was not determined to be distinct from the other promises or performance 

obligations identified in the agreement. Accordingly, such licenses are therefore combined with other promises in the agreement. The Company exercises 
judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or 
at a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue. The Company evaluates the 
measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

Customer options

If an arrangement is determined to contain customer options that allow the customer to acquire additional goods or services, the goods and services 

underlying the customer options are not considered to be performance obligations at the outset of the arrangement, as they are contingent upon option 
exercise. The Company evaluates the customer options for material rights or options to acquire additional goods or services for free or at a discount. If the 
customer options are determined to represent a material right, the material right is recognized as a separate performance obligation at the outset of the 
arrangement. No such material rights were identified in the arrangement with Acadia. If such material rights were identified, then the Company would 
allocate the transaction price to material rights based on the relative standalone selling price, which is determined based on the identified discount and the 
probability that the customer will exercise the option. Amounts allocated to a material right are not recognized or begin to be recognized as revenue until, at 
the earliest, the option is exercised. 

113

 
Research and development services

The promises under the Company’s collaboration agreement with Acadia includes research and development services to be performed by the 
Company for or on behalf of the customer. Payments or reimbursements resulting from the Company’s research and development efforts are recognized as 
the services are performed and presented on a gross basis because the Company is the principal for such efforts. 

Milestone payments

At the inception of the Acadia arrangement that includes development milestone payments, the Company evaluates whether the milestones are 

considered probable of being achieved and estimates the amount to be included in the transaction price using the most likely amount method. If it is 
probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are 
not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are 
received. The Company evaluates factors such as the scientific, clinical, regulatory, commercial and other risks that must be overcome to achieve the 
particular milestone in making this assessment. There is judgment involved in determining whether it is probable that a significant revenue reversal would 
not occur. At the end of each reporting period, the Company reevaluates the probability of achievement of all milestones subject to constraint and, if 
necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, which would affect 
revenues and earnings in the period of adjustment. The development milestones in the Acadia arrangement were not considered probable of achievement at 
the outset of the arrangement and as of December 31, 2023.

Deferred offering costs 

The Company capitalizes certain legal, professional accounting and other third-party fees that are directly associated with in-process equity 
financings as deferred offering costs until such financings are consummated. After consummation of the equity financing, these costs are recorded in the 
consolidated statement of stockholders’ equity as a reduction of additional paid-in capital. 

Property and equipment 

Property and equipment are recorded at cost less accumulated depreciation. Cost includes the acquisition costs and all costs necessary to bring the 

asset to the location and working condition necessary for its intended use. Depreciation expense is recognized using the straight-line method over the 
estimated useful life of each asset. Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from the 
accounts and any resulting gain or loss is included in the accompanying consolidated statements of operations and comprehensive loss. Expenditures for 
normal, recurring or periodic repairs and maintenance related to property and equipment are charged to expense as incurred. The cost for planned major 
maintenance activities, including the related acquisition or construction of assets, is capitalized if it will result in future economic benefits. 

Estimated useful lives for property and equipment are as follows: 

Property and equipment

Computer and office equipment

Laboratory equipment and Furniture and fixtures

Leasehold improvements

  Estimated useful life
  3-5 years
  5-7 years
  Lesser of estimated useful life or remaining lease term

Impairment of long-lived assets 

The Company reviews the recoverability of its long-lived assets when events or changes in circumstances occur that indicate that the carrying value 

of the assets may not be recoverable. The assessment of possible impairment is based on the ability to recover the carrying value of the assets from the 
expected future cash flows (undiscounted) of the related operations. If these cash flows are less than the carrying value of such assets, an impairment loss 
for the difference between the estimated fair value and carrying value is recorded. There were no impairment losses recognized during the years ended 
December 31, 2023 and 2022. 

114

 
 
 
 
Research and development costs 

Research and development costs are expensed as incurred. Research and development expenses are comprised of costs incurred in performing 

research and development activities, including salaries and benefits, facilities costs, depreciation, third-party license fees, and costs related to third parties 
engaged to conduct preclinical research development activities. 

The Company has entered into various research and development contracts with research institutions and other companies to conduct research on its 
behalf. These agreements are generally cancellable. The Company records accruals for estimated ongoing research costs. When evaluating the adequacy of 
the accrued liabilities, the Company analyzes progress of the studies, including the phase or completion of events, invoices received and contracted costs. 
Significant judgments and estimates may be required in determining the accrued balances at the end of any reporting period. Actual results could differ 
from the Company’s estimates. The Company’s historical accrual estimates have not been materially different from the actual costs. 

Stock-based compensation

The Company measures its stock-based awards granted based on the estimated fair values of the awards and recognizes the compensation expense 

for employees and nonemployees over the requisite service period. 

Stock options

The Company uses the Black-Scholes option-pricing model to estimate the fair value of its stock options. 

The Company has elected the practical expedient to use the midpoint between vesting date and the contractual term as the expected term for certain 

awards with service or performance conditions. Stock-based compensation is recognized using the straight-line method. Forfeitures of unvested stock-
based awards are accounted for when they occur. 

Restricted stock units ("RSUs")

For RSUs issued to employees, the Company recognizes the grant date fair value of the RSUs on a straight-line basis over the requisite service 

period, which is generally the vesting period of the respective awards. RSUs granted typically vest annually over a four-year period but may be granted 
with different vesting terms.

Patent costs 

All patent-related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about 

the recovery of the expenditure. Amounts incurred are classified as general and administrative expenses in the accompanying consolidated statements of 
operations and comprehensive loss. 

Income taxes 

The Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for 

the estimated future tax consequences attributable to temporary differences between the consolidated financial statement carrying amounts of existing 
assets and liabilities and their respective tax base. Deferred tax assets and liabilities are determined on the basis of the differences between the consolidated 
financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the temporary differences are expected to be 
settled or recovered. Changes in deferred tax assets and liabilities are recorded in the provision for income taxes. The Company assesses the likelihood that 
its deferred tax assets will be recovered from future taxable income and, to the extent it believes, based upon the weight of available evidence that it is more 
likely than not that all or a portion of the deferred tax assets will not be realized, a valuation allowance is established through a charge to income tax 
expense. Potential for recovery of deferred tax assets is evaluated by estimating the future taxable profits expected and considering prudent and feasible tax 
planning strategies. At December 31, 2023 and 2022, the Company has recorded a full valuation allowance. 

Reserves are provided for tax benefits for which realization is uncertain. Such benefits are only recognized when the underlying tax position is 
considered more-likely-than-not to be sustained on examination by a taxing authority, assuming they possess full knowledge of the position and facts. 
Interest and penalties related to uncertain tax positions are recognized in the provision of income taxes; however, the Company currently has no interest or 
penalties related to uncertain income tax benefits. 

115

 
Segment and geographic information 

Operating segments are defined as components of an entity about which separate discrete information is available for evaluation by the chief 

operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company operates in one 
segment in the United States. The Company’s chief executive officer, as the chief operating decision-maker, manages and allocates resources to the 
operations of the Company on a total company basis using consolidated financial information. 

Emerging growth company and smaller reporting company status 

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the JOBS Act). Under the JOBS Act, 

emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act, until such time 
as those standards apply to private companies. 

The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective 

dates for public and private companies until the earlier of the date that it is (i) no longer an emerging growth company or (ii) affirmatively and irrevocably 
opt out of the extended transition period provided in the JOBS Act. As a result, the Company’s consolidated financial statements may not be comparable to 
companies that comply with the new or revised accounting pronouncements as of public company effective dates. 

The Company will remain an emerging growth company until the earliest of (i) the last day of the first fiscal year (a) following the fifth anniversary 
of the completion of our IPO, (b) in which the Company has total annual gross revenue of at least $1.235 billion or (c) in which the Company is deemed to 
be a large accelerated filer, which means the market value of the Company’s common stock that is held by non-affiliates exceeds $700.0 million as of the 
prior June 30th, and (ii) the date on which the Company has issued more than $1.0 billion in non-convertible debt securities during the prior three- year 
period. The Company anticipates ceasing to be an emerging growth company as of December 31, 2024, which is the last day of our fiscal year following 
the fifth anniversary of the completion of our IPO.

The Company is also a “smaller reporting company,” meaning that in the event of an initial public offering the market value of its stock held by non-

affiliates plus the proposed aggregate amount of gross proceeds to the Company as a result of such offering is less than $700.0 million and its annual 
revenue is less than $100.0 million during the most recently completed fiscal year. The Company may continue to be a smaller reporting company as long 
as either (i) the market value of its stock held by non-affiliates is less than $250.0 million or (ii) its annual revenue is less than $100.0 million during the 
most recently completed fiscal year and the market value of its stock held by non-affiliates is less than $700.0 million. If the Company is a smaller 
reporting company at the time it ceases to be an emerging growth company, the Company may continue to rely on exemptions from certain disclosure 
requirements that are available to smaller reporting companies. Specifically, as a smaller reporting company, the Company may choose to present only the 
two most recent fiscal years of audited financial statements in its Annual Report on Form 10-K and, similar to emerging growth companies, smaller 
reporting companies have reduced disclosure obligations regarding executive compensation. 

Recently issued accounting pronouncements 

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 
2023-07”), which expands disclosures about a public entity’s reportable segments and requires more enhanced information about a reportable segment’s 
expenses, interim segment profit or loss, and how a public entity’s chief operating decision maker uses reported segment profit or loss information in 
assessing segment performance and allocating resources. The standard is effective for annual reporting periods beginning after December 15, 2023, and 
interim periods within years beginning after December 15, 2024, with early adoption permitted. The Company is currently assessing the impact that the 
adoption will have on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). ASU 
2023-09 requires that an entity disclose specific categories in the effective tax rate reconciliation as well as provide additional information for reconciling 
items that meet a quantitative threshold and certain disclosures of state versus federal income tax expenses and taxes paid. ASC 2023-09 is effective for 
fiscal years beginning after December 15, 2024. The Company does not expect the adoption of ASU 2023-09 to have a material impact on its consolidated 
financial statements and will adopt the standard effective January 1, 2025.

116

 
3. Fair value measurements 

The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the level of 

the fair value hierarchy utilized to determine such fair values: 

Cash equivalents:

Money market funds

Total

Marketable Securities:

US Government debt securities

Total

Cash equivalents:

Money market funds

Total

Marketable Securities:
Corporate bonds
Commercial paper
US Government debt securities

Total

Fair value measurements as of
December 31, 2023

Level 1

Level 2

Level 3

Total

186,186     $
186,186     $

—     $
—     $

—     $
—     $

186,186  
186,186  

—     $
—     $

9,952     $
9,952     $

—     $
—     $

9,952  
9,952  

Fair value measurements as of
December 31, 2022

Level 1

Level 2

Level 3

Total

111,927     $
111,927     $

—     $
—     $

—     $
—     $

111,927  
111,927  

—     $
—    
—    
—     $

34,527     $
7,978      
73,534      
116,039     $

—     $
—      
—      
—     $

34,527  
7,978  
73,534  
116,039  

  $
  $

  $
  $

  $
  $

  $

  $

The Company’s cash equivalents and marketable securities are carried at fair value, determined according to the fair value hierarchy described 
above and in Note 2. The carrying value of the Company’s accounts payable and accrued expenses approximate their fair values due to the short-term 
nature of these liabilities. 

The Company’s assets with fair value categorized as Level 1 within the fair value hierarchy include money market funds. Money market funds are 

publicly traded mutual funds and are presented as cash equivalents on the consolidated balance sheets as of December 31, 2023 and 2022.

The Company measures its marketable securities at fair value on a recurring basis and classifies those instruments within Level 2 of the fair value 
hierarchy. Marketable securities are valued using models or other valuation methodologies that use Level 2 inputs. These models are primarily industry-
standard models that consider various assumptions, including time value, yield curve, volatility factors, default rates, current market and contractual prices 
for the underlying financial instruments, as well as other economic measures. Substantially all of these assumptions are observable in the marketplace, can 
be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace.

There were no transfers to Level 3 in the periods presented.

4. Marketable Securities

The following table summarizes the Company’s marketable securities as of December 31, 2023 (in thousands): 

Marketable securities:

US Government debt securities

Total

As of December 31, 2023

Amortized 
Cost

Unrealized 
Gains

Unrealized 
Loss

    Fair Value  

  $
  $

9,976     $
9,976     $

—     $
—     $

(24 )    
(24 )  $

9,952  
9,952  

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The following table summarizes the Company’s marketable securities as of December 31, 2022 (in thousands): 

Marketable securities:
Corporate bonds
Commercial paper
US Government debt securities

Total

As of December 31, 2022

Amortized 
Cost

Unrealized 
Gains

Unrealized 
Loss

    Fair Value  

  $

  $

34,662     $
8,019      
74,533      
117,214     $

—     $
—      
—      
—     $

(135 )  $
(41 )    
(999 )    

34,527  
7,978  
73,534  
(1,175 )  $ 116,039  

The weighted average maturity of the Company’s marketable securities as of December 31, 2023 ranges from approximately 0.09 years to 0.16 

years.

The Company did not record an allowance for credit losses as of December 31, 2023 related to our marketable securities. Further, given the lack of 

significant change in the credit risk of these investments, the Company did not recognize any other-than-temporary impairment losses. 

5. Property and equipment, net 

Property and equipment, net consisted of the following: 

Laboratory equipment
Furniture and fixtures
Leasehold improvements
Office equipment
Construction in progress

Less accumulated depreciation

As of December 31,

2023

2022

9,383     $
312    
2,294    
440    
65    
12,494    
(6,671 )  
5,823     $

7,903  
312  
1,867  
353  
447  
10,882  
(4,207 )
6,675  

  $

  $

Depreciation expense was $2.5 million and $1.5 million for the years ended December 31, 2023 and 2022, respectively.

6. Accrued and other current liabilities 

Accrued and other current liabilities consisted of the following: 

Accrued employee compensation costs
Accrued professional
Accrued research and development costs
Current portion of operating lease liabilities
Other current liabilities

As of December 31,

2023

2022

5,611     $
651    
4,634    
2,062    
857    
13,815     $

5,754  
525  
6,601  
2,359  
509  
15,748  

  $

  $

7. Commitments and contingencies 

Operating leases

The Company determines whether an arrangement is a lease at inception. The Company accounts for a lease when it has the right to control the 

leased asset for a period of time while obtaining substantially all of the assets’ economic benefits. Operating lease right-of-use assets and operating lease 
liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the lease commencement date. The 
discount rate used to determine the present value of the lease payments is the Company’s incremental borrowing rate based on the information available at 
lease inception, as the Company did not have information to determine the rate implicit in the leases. Lease expense for operating 

118

 
 
 
 
 
 
 
   
   
 
     
     
     
   
   
   
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
leases is recognized on a straight-line basis over the reasonably assured lease term based on the total lease payments (which include initial direct costs and 
lease incentives). Lease expense is included in operating expenses in the consolidated statements of operations and comprehensive loss. The Company’s 
lease agreements also contain variable payments, primarily maintenance-related costs, which are expensed as incurred and not included in the measurement 
of the right-of-use assets and lease liabilities. 

In August 2018, the Company entered into an agreement to lease approximately 23,000 square feet of space for a term of three years. Lease terms 

are triple net lease commencing at $0.9 million per year, then with 3% annual base rent increases plus operating expenses, real estate taxes, utilities and 
janitorial fees. The lease commencement date was December 10, 2018. 

In September 2021, the Company entered into an agreement to extend the initial term of the 23,000 square foot lease for a period of three years 
commencing on December 15, 2021 and ending December 31, 2024. In addition, this lease provides for the lease of an additional 15,000 square feet of 
rentable space beginning on April 1, 2022 and ending on December 31, 2024. In December 2021, the Company recognized a right-of-use asset and 
operating lease liability of $3.5 million for the 23,000 square feet. On April 1, 2022, the Company recognized a right-of-use asset and operating lease 
liability of $1.8 million for the 15,000 square feet.

In December 2023, the Company entered into an agreement to extend the term of the 38,000 square foot lease for a period of two years commencing 
on January 1, 2025 and ending on December 31, 2026. In December 2023, the Company recognized a right-of-use asset and operating lease liability of $4.1 
million.

In December 2018, the Company entered into an agreement to lease 2,485 square feet of space for an initial term of three years. The lease includes 

one renewal option for an additional two years, however, any time after the initial term the landlord may relocate the Company from the premises to a 
space reasonably comparable in size and utility. As the Company does not have the right to control the use of the identified asset after the initial term, the 
renewal option was excluded from the lease liability calculation. Lease terms commence at $0.2 million per annum, with 2.5% annual base rent increases 
plus operating expenses, real estate taxes, utilities and janitorial fees. The lease commencement date was May 1, 2019. 

In June 2021, the Company amended the agreement to extend the initial term of the 2,485 square foot lease for a period of three years commencing 

May 1, 2022 and ending April 30, 2025. In addition, the amendment provided for the lease of an additional 2,357 square feet of rentable space beginning 
on July 6, 2021 and ending on April 30, 2025. The amended lease provides the Company with the option to extend the term of the lease for an additional 
two years. In 2021, the Company recognized a right-of-use asset and operating lease liabilities of $0.7 million for the extension of the lease to April 30, 
2025 and a right-of-use asset and operating lease liabilities of $0.8 million for the additional 2,357 square feet of rentable space. 

Future minimum lease payments under non-cancellable leases as of December 31, 2023, are as follows (in thousands): 

2024
2025
2026
Total lease payments
Less imputed interest

Present value of lease liabilities

  $

  $

2,608  
2,661  
2,564  
7,833  
(998 )
6,835  

Lease balances as of December 31, 2023 and December 31, 2022 are as follows (in thousands):

Operating right-of-use assets
Current portion of operating lease liabilities
Non-current portion of operating lease liabilities

Total operating lease liabilities

As of December 31,

2023

2022

6,611   $

2,062   $
4,773    
6,835   $

4,753  

2,359  
2,717  
5,076  

  $
  $

  $

The weighted average remaining lease term and weighted average discount rate of our operating leases as of December 31, 2023 are as follows:

Weighted average remaining lease term in years
Weighted average discount rate

2.9  
9.92 %

119

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
In accordance with Topic 842, lease expense incurred under operating leases was $2.4 million for the year ended December 31, 2023, and $2.2 

million for the year ended December 31, 2022.

Scientific Advisory Board Agreement

In June 2020, the Company entered into a scientific advisory board agreement with a member of the Company’s board of directors, who is also an 

employee of Cold Spring Harbor Laboratory (“CSHL”), to provide scientific advisory services related to the Company’s Targeted Augmentation of Nuclear 
Gene Output (“TANGO”) antisense oligonucleotide technology and other antisense oligonucleotide technologies, as well as current and future therapeutic 
targets and programs. Following the expiration of the initial scientific agreement in June 2021 and a renewal agreement in June 2022, the parties entered 
into subsequent scientific board agreements on substantially the same terms. The Company did not recognize any expense in the year ending December 31, 
2023 compared to expense of $0.02 million for the year ended December 31, 2022. The agreement has expired with no renewal put in place.

License and research agreements

In July 2015, the Company entered into a worldwide license agreement with CSHL (the “CSHL Agreement”), with respect to TANGO patents. 
Under the CSHL Agreement, the Company received an exclusive (except with respect to certain government rights and non-exclusive licenses), worldwide 
license under certain patents and applications relating to TANGO. The CSHL Agreement obligated the Company to make payments that are contingent 
upon certain milestones being achieved. The Company was also required to pay royalties, tiered based on the scope of patent coverage for each licensed 
product, ranging from a low-single digit percentage to a mid-single digit percentage on annual net sales. These royalty obligations applied on a licensed 
product-by-licensed product and country-by-country basis until the latest of (i) the expiration of the last valid claim of a CSHL patent covering the 
applicable licensed product or (ii) the expiration of any regulatory exclusivity for the applicable licensed product. In addition, if the Company sublicensed 
the rights under the CSHL Agreement, it was required to pay a maximum of twenty percent of the sublicense revenue to CSHL, which may have been 
reduced to a mid-teens or a mid-single digit percentage upon achievement of certain clinical milestones for the applicable licensed product. Finally, the 
Company was required to pay an annual license maintenance fee of $0.01 million, which amount is creditable against any owed royalty or milestone 
payments. The maximum aggregate potential milestone payments payable totaled approximately $0.90 million. Additionally, certain licenses under the 
CSHL Agreement required the Company to reimburse CSHL for certain past and ongoing patent related expenses, however there were no expenses related 
to these reimbursable patent costs during the years ended December 31, 2023 and 2022. After the completion of a 90-day waiting period, in May 2023 the 
Company terminated the CSHL Agreement. The Company does not expect the termination of the CSHL Agreement to have a significant impact on the 
intellectual property underlying any of its current product candidates, including STK-001 and STK-002, or its continued development of the TANGO 
platform.

In April 2016, the Company entered into an exclusive, worldwide license agreement with the University of Southampton (the “Southampton 
Agreement”), whereby the Company acquired rights to foundational technologies related to the Company’s TANGO technology. Under the Southampton 
Agreement, the Company receives an exclusive, worldwide license under certain licensed patents and applications relating to TANGO. Under the 
Southampton Agreement, the Company may be obligated to make additional payments that are contingent upon certain milestones being achieved, as well 
as royalties on future product sales. These royalty obligations survive until the latest of (i) the expiration of the last valid claim of a licensed patent covering 
a subject product or (ii) the expiration of any regulatory exclusivity for the subject product in a country. In addition, if the Company sublicenses its rights 
under the Southampton Agreement, the Company is required to pay a mid-single digit percentage of the sublicense revenue to the University of 
Southampton. As of December 31, 2023, the Company had paid $0.7 million under the Southampton Agreement as a result of entering into the Acadia 
Pharmaceuticals Inc. license and collaboration agreement in January 2022 (see Note 8). Additionally, certain licenses under the Southampton Agreement 
require the Company to reimburse the University of Southampton for certain past and ongoing patent related expenses. For the year ended December 31, 
2023 these expenses were $0.2 million compared to $0.02 million for the year ended December 31, 2022.

120

 
 
 
Litigation 

The Company may periodically become subject to legal proceedings and claims arising in connection with ongoing business activities, including 

claims or disputes related to patents that have been issued or that are pending in the field of research on which it is focused. As of December 31, 2023, the 
Company had no legal proceedings to which it was a party or to which its property was subject that, in the opinion of management, would have a material 
adverse effect on its business. 

8. License and Collaboration Agreement with Acadia Pharmaceuticals Inc.

In January 2022, the Company entered into a license and collaboration agreement with Acadia Pharmaceuticals Inc. for the discovery, development 

and commercialization of novel RNA-based medicines for the treatment of severe and rare genetic neurodevelopmental diseases of the central nervous 
system. The agreement focuses on the targets SYNGAP1, MECP2 (Rett syndrome), and an undisclosed neurodevelopmental target of mutual interest. In 
connection with each target, the Company will collaborate with Acadia to identify potential treatments for further development and commercialization as 
licensed products. With respect to SYNGAP1, the Company has agreed with Acadia to co-develop and co-commercialize licensed products for such target 
globally, and in connection therewith the Company granted to Acadia worldwide, co-exclusive (with Stoke) licenses for such licensed products. With 
respect to MECP2 and the neurodevelopmental target, the Company granted to Acadia worldwide, exclusive licenses to develop and commercialize 
licensed products for such targets. 

Pursuant to the terms of the agreement, the Company received an upfront payment of $60.0 million from Acadia. Acadia agreed to fund the research 

to identify potential licensed products for MECP2 and the neurodevelopmental target, and the Company will equally fund with Acadia the research to 
identify potential licensed products for SYNGAP1. The Company is eligible to receive up to $907.5 million in potential total milestone payments based 
upon the achievement of certain development, regulatory, first commercial sales and sales milestone events across the programs for the three targets, 
assuming each milestone were achieved at least once. With respect to licensed products for MECP2 and the neurodevelopmental target, the Company is 
also eligible to receive tiered royalties at percentages ranging from the mid-single digits to the mid-teens on future net sales by Acadia of licensed products 
worldwide. Royalties payable under the agreement are subject to standard royalty reductions. For SYNGAP1 licensed products that the Company is co-
developing and co-commercializing, the Company will be responsible for 50% of the development and commercialization costs and will receive 50% of the
profits from global commercialization. The Company is provided with a co-development and co-commercialization opt out option relating to the 
SYNGAP1 target indication at the Company’s discretion. Such opt-out would reduce development and commercialization milestones but would provide the 
Company with royalties on an escalating basis attributable to net sales milestones.

Acadia Agreement Accounting

At the commencement of the Acadia agreement the Company identified three performance obligations consisting of pre-clinical research activities 

for each of the three targets, SYNGAP1, MECP2, and the undisclosed neurodevelopmental target. The exclusive or co-exclusive licenses granted to Acadia 
to conduct pre-clinical research activities on each of the three targets, and participation on each of the respective joint research committees were identified 
as promised services. However, the licenses granted to Acadia and the research activities were determined to be not distinct from each other, and therefore 
are considered a combined performance obligation for each of the three targets. Participation on each of the joint research committees was determined to be 
quantitatively and qualitatively immaterial in the context of the arrangement with Acadia.

The Company is recognizing the transaction price for the pre-clinical research activities for each of the three targets over time as the research 
services are provided. The transfer of control to Acadia occurs over this time period, and in management’s judgment, is the best measure of progress 
towards satisfying the performance obligation. An input method is used that measures the cost incurred to date in satisfying each of the three research 
activities in relation to the estimated total projected cost of each of the research activities to fulfill the respective obligations. The cumulative effect of 
revisions to estimated costs and/or the transaction price to complete the research performance obligations will be recorded in the period in which changes 
are identified and amounts can be reasonably estimated. Payments or reimbursements resulting from the Company’s research and development efforts were 
recognized as the services are performed.

Milestone payments that are not within the control of the Company, such as regulatory approvals, are not considered probable of being achieved 

until those approvals are received. For other milestones, the Company evaluated factors such as the scientific, clinical, regulatory, commercial, and other 
risks that must be overcome to achieve the particular milestone in making this assessment. Milestones that are outside of the Company’s or Acadia’s 
control will not be recognized until such milestones are achieved. As to the other milestones, to date, no milestone payments have been included in the 
transaction price due the uncertainty as to whether these milestones will be achieved. The Company will at the end of each reporting period reevaluate the 
probability of achievement of all milestones subject to constraint and, if necessary, adjust its estimate of 

121

 
the overall transaction price for each of the research activities on the three targets. Any such adjustments will be recorded on a cumulative catch-up basis. 

As of December 31, 2023, the Company had $48.4 million in upfront consideration associated with the Acadia agreement relating to performance 

obligations that are unsatisfied or partially unsatisfied.

9. Stock-Based Compensation

In June 2019, the Company’s board of directors and stockholders approved the 2019 Equity Incentive Plan (the “2019 Plan”) which became 
effective on June 17, 2019 and replaced the Company’s 2014 Equity Incentive Plan (the “2014 Plan”). In addition to the shares of common stock reserved 
for future issuance under the 2014 Plan that were added to the 2019 Plan upon its effective date, the Company initially reserved 2,200,000 shares of 
common stock for issuance under the 2019 Plan. The number of shares reserved for issuance under the Company’s 2019 Plan will increase automatically 
on January 1 of each of 2020 through 2029 by the number of shares equal to 4% of the aggregate number of outstanding shares of the Company’s common 
stock as of the immediately preceding December 31, or a lesser number as may be determined by the Company’s board of directors. 

In April 2023, the Company’s board of directors adopted the Stoke Therapeutics, Inc. 2023 Inducement Plan (the “2023 Plan”). As permitted by 

Nasdaq stock market rules, the Company’s stockholders were not required to approve the Inducement Plan. The Inducement Plan provides for up to 
1,000,000 shares of the Company’s common stock under awards granted to newly hired employees. An “award” is any right to receive common stock of 
the Company through nonstatutory stock options or restricted stock units. 

As of December 31, 2023 there were no shares available for future issuance under the 2014 Plan, 2,767,209 shares were available for future issuance 

under the 2019 Plan and 940,300 shares were available under the 2023 Plan.

During the years ended December 31, 2023 and 2022, the Company granted options to purchase 1,599,227 and 3,459,500 shares of common stock 
to certain of its employees, and directors, respectively. The options vest over a period of up to four years. During the year ended December 31, 2023, the 
Company granted 1,538,302 restricted stock units to its employees. The restricted stock units vest over a period of up to four years.

In December 2023, the Company offered employees with outstanding option grants that had an exercise price of greater than $14.00 per share the 
opportunity to exchange those options for a number of restricted stock units with a fair value equal to the then fair value of the options surrendered. As a 
result, there was no material incremental compensation expense associated with those RSUs issued in exchange for options. The RSUs vest annually over a 
period of one to two years. In the aggregate, 2,907,127 options were exchanged for 730,602 RSUs.

A summary of stock option activity for awards is presented below: 

Outstanding as of December 31, 2022

Granted
Exercised
Forfeitures
(2)
Expired

(2)

Outstanding as of December 31, 2023
Exercisable as of December 31, 2023

Number of
shares

8,274,647     $
1,599,227      
(145,877 )    
(1,449,164 )    
(1,800,770 )    
6,478,063     $
4,034,517     $

Weighted
average
exercise
price

Weighted
average
remaining
contractual
life (years)

18.28      
9.32    
2.55    
28.00    
34.88    
9.64      
8.88      

Aggregate
intrinsic
(1)
value

7.6     $

20,598  

6.9     $
5.7     $

8,435  
8,439  

(1)

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 December 31, 2023 and 2022. 

(2)

Options exchanged are classified as either forfeitures or expired based on vesting status at the time of Exchange Offer.

The weighted average grant date fair value for stock options granted during the years ended December 31, 2023 and 2022 was $6.13 and $10.32, 

respectively. The aggregate grant date fair value of stock options granted during the years ended 

122

 
 
 
 
   
   
   
 
   
   
     
   
   
     
   
   
     
   
   
     
   
   
   
 
December 31, 2023 and 2022 was $9.8 million and $35.7 million, respectively. The aggregate intrinsic value of stock options exercised during the year 
ended December 31, 2023 and 2022 was $0.9 million and $3.5 million, respectively.

A summary of restricted stock unit activity is presented below:

Outstanding as of December 31, 2022

Awarded
RSUs in exchange for options as part of option exchange
Vested
Forfeitures

Outstanding as of December 31, 2023
Vested or expected to vest as of December 31, 2023

For the year ended December 31, 2023, there were no vested RSUs. 

Stock-based compensation

Number of
shares

Aggregate
intrinsic
value

Weighted average grant 
date fair value

—     $

807,700    
730,602    
—    
(25,200 )  
1,513,102     $
1,513,102     $

—     $

7,959     $
7,959     $

—  
9.04  
3.95  
—  
9.15  
6.58  
6.58  

The Company recorded stock-based compensation expense of $25.3 million and $22.9 million during the years ended December 31, 2023 and 2022, 

respectively. Of the total stock-based compensation recorded during the year ending December 31, 2023, $2.3 million is related to restricted stock units. 
There were no grants of restricted stock units prior to 2023.

As of December 31, 2023, there was $16.1 million of unrecognized compensation cost related to unvested stock options granted under the 2019 and 
the 2023 Plans. Compensation expense is expected to be recognized over a weighted average period of 2.6 years as of December 31, 2023. As of December 
31, 2023, there was $26.5 million of unrecognized stock-based compensation related to restricted stock units and it is expected to be recognized over a 
weighted average period of 2.5 years.

Stock-based compensation expense recorded as research and development and general and administrative expenses in the accompanying 

consolidated statements of operations and comprehensive loss is as follows: 

Research and development
General and administrative

Year ended December 31,

2023

2022

  $

  $

9,925     $
15,332    
25,257     $

8,901  
13,953  
22,854  

The Company uses the Black-Scholes option pricing model to calculate the grant-date fair value of stock options. The fair values of the options 

granted to employees and directors were calculated using the following assumptions for the years ended December 31, 2023 and 2022: 

Risk-free interest rate
Expected dividend yield
Expected life
Expected volatility

2019 Employee stock purchase plan

Year ended December 31,

2023
3.57-3.94%  
0%  
5.5-6.25 years  
70-73%  

2022
1.82-4.15%
0%
5.5-6.25 years
70-71%

In June 2019, the Company adopted the 2019 Employee Stock Purchase Plan (“ESPP”), which became effective on June 18, 2019. The Company 

initially reserved 315,000 shares of common stock for sale under the ESPP. At December 31, 2023, the Company had 1,704,168 shares available for 
issuance under the plan. The average grant date fair value per share under the plan was $9.88 for 2023. The total ESPP stock-based compensation expense 
for the year ended December 31, 2023 was $0.3 million and for the year ended December 31, 2022 was $0.3 million. The number of shares reserved for 
issuance under the ESPP will increase automatically on January 1st of each of the first ten calendar years following the first offering 

123

 
 
 
 
   
   
 
   
   
       
   
       
   
       
   
       
   
   
 
 
 
 
 
 
 
   
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
date by the number of shares equal to the lesser of 1% of the total outstanding shares of the Company’s common stock as of the immediately preceding 
December 31 or a lower amount determined by the Company’s board of directors. The aggregate number of shares issued over the term of the ESPP will 
not exceed 3,150,000 shares of the Company’s common stock.

10. Net loss per share 

The following table summarizes the computation of basic and diluted net loss per share of the Company: 

Numerator:

Net loss
Denominator:

Weighted-average number of common shares, basic
   and diluted

Net loss per share, basic and diluted

Year ended December 31,
2022
2023

  $

(104,699 )   $

(101,067 )

43,994,862    

  $

(2.38 )   $

38,897,442  
(2.60 )

The Company’s potential dilutive securities, which include common stock, RSUs, and ESPP purchase rights, have been excluded from the 
computation of diluted net loss per share as the effect would be anti-dilutive. Therefore, the weighted average number of common shares outstanding used 
to calculate both basic and diluted net loss per share is the same. 

The Company excluded the following potential common shares, presented based on amounts outstanding at period end, from the computation of 

diluted net loss per share for the periods indicated because including them would have had an anti-dilutive effect: 

Outstanding options to purchase common stock
Restricted stock units
Total

As of December 31,

2023
6,478,063      
1,513,102      
7,991,165      

2022
8,274,647  
—  
8,274,647  

11. Income taxes 

A reconciliation of the expected income tax expense (benefit) computed using the federal statutory income tax rate the Company’s effective income 

tax rate is as follows: 

Expected income tax benefit at the federal statutory rate
State income taxes, net of federal benefit
Non-deductible items
Research and development credit, net
Other
Change in valuation allowance

Total

124

Year ended December 31,

2023

2022

21.0   %  
7.7    
(1.1 )  
3.5    
2.4    
(33.5 )  

0.0   %  

21.0   %
7.4    
(0.9 ) 
3.9    
0.1    
(31.5 ) 
0.0   %

 
 
 
 
 
 
 
 
   
 
 
     
   
 
     
   
 
 
 
 
 
 
 
 
 
 
 
   
 
   
   
   
 
 
 
 
   
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The principal components of the Company’s deferred tax assets and liabilities consist of the following: 

Deferred tax assets:

Federal and state net operating loss carryforwards
Research and development tax credits
Research and development capitalized expenses
Accrued compensation and stock-based compensation
Deferred revenue/other

Gross deferred tax assets

Less: valuation allowance

Net deferred tax assets

As of December 31,

2023

2022

  $

  $

52,643     $
17,444    
32,290    
17,912    
13,017    
133,306    
(133,306 )  

—     $

57,746  
12,613  
17,148  
10,274  
142  
97,923  
(97,923 )
—  

From inception through December 31, 2022, the Company has incurred net operating losses (“NOL”). During 2023, for income tax purposes, the 

Company was required to fully recognize any unamortized advanced payments from the Acadia Collaboration Agreement as income, which in addition to 
capitalizing Section 174 research expenses resulted in taxable income that was fully offset by the use of existing net operating losses and tax credits. The 
Company does not expect future taxable income and should incur substantial future losses.

In accordance with ASC 740, Accounting for Income Taxes, management of the Company has evaluated the positive and negative evidence bearing 

upon the realizability of its deferred tax assets and has determined that it is more likely than not that the Company will not recognize the net benefits of 
federal and state deferred tax assets. A full valuation allowance of $133.3 million and $97.9 million was established at December 31, 2023 and 2022, 
respectively. The change in the valuation allowance was an increase of $35.4 million and $31.8 million in 2023 and 2022, respectively.

As of December 31, 2023, and 2022, the Company had federal NOL carryforwards of $189.5 million and $210.9 million, respectively, which may 

be available to reduce future taxable income. Federal NOLs generated prior to December 31, 2018 expire at various dates beginning in 2035 and NOLs 
generated after December 31, 2018 carryforward indefinitely. As of December 31, 2023, and 2022, the Company had state NOLs of $199.4 million and 
$212.8 million, respectively, which may be available to reduce future taxable income. The state NOLs expire at various dates beginning in 2035. 

As of December 31, 2023 and 2022, the Company had federal research and development tax credit (“R&D Credit”) carryforwards of $12.8 million 

and $9.2 million, respectively, and state R&D Credit carryforwards of $5.9 million and $4.3 million, respectively. Both federal and state R&D Credit 
carryforwards may be available to reduce future tax liabilities and expire at various dates beginning in 2034.

The Internal Revenue Code of 1986, as amended (“IRC”), provides for a limitation of the annual use of NOLs, R&D Credits, and other tax attributes 

following certain ownership changes that could limit our ability to utilize NOL and R&D Credit carryforwards. Under IRC Sections 382 and 383 an 
ownership change is generally defined as a greater than 50% change (by value) in its equity ownership over a three-year period. The Company has 
experienced ownership changes in the past and based on the existing Section 382 limitations, $0.9 million and $0.02 million of existing Federal NOLs and 
R&D credits, respectively, will not be utilizable. The Company may experience additional ownership changes in the future because of subsequent shifts in 
its stock ownership. As a result, the Company's ability to use its pre-change NOLs to offset taxable income, if any, is subject to limitations, which could 
potentially result in increased future tax liability. In addition, at the state level, there may be periods during which the use of NOLs is suspended or 
otherwise limited, which could accelerate or permanently increase state taxes owed.

The Company applies ASC 740 related to accounting for uncertainty in income taxes. The Company’s reserves related to income taxes are based on 

a determination of whether, and how much of, a tax benefit taken by the Company in its tax filings or positions is more likely than not to be realized 
following resolution of any potential contingencies present related to the tax benefit. At December 31, 2023, and 2022 the Company had no unrecognized 
tax benefits. Interest and penalty charges, if any, related to unrecognized tax benefits would be classified as income tax expense in the accompanying 
consolidated statements of operations and comprehensive loss.

125

 
 
 
 
 
 
 
   
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12. Employee benefits 

In 2016, the Company established a defined-contribution savings plan under Section 401(k) of the Internal Revenue Code (the “401(k) Plan”). The 

401(k) Plan covers all employees who meet defined minimum age and service requirements and allows participants to defer a portion of their annual 
compensation on a pretax basis. The Company matches contributions up to 4% of annual salary for those employees who are participating in the 401(k) 
Plan. For the year ended December 31, 2023, the Company made matching contributions of $0.7 million and for the year ended December 31, 2022, the 
Company made matching contributions of $0.6 million.

13. Subsequent events 

Since December 31, 2023, through the date of the issuance of these consolidated financial statements, the Company sold 0.2 million shares of our 

common stock and received $1.3 million after deducting commissions related to the Sales Agreement.

126

 
 
STOKE THERAPEUTICS, INC.

RESTATED CERTIFICATE OF INCORPORATION

Exhibit 3.1

Stoke Therapeutics, Inc., a Delaware corporation, hereby certifies as follows:

1.  The  name  of  the  corporation  is  “Stoke  Therapeutics,  Inc.”  The  date  of  the  filing  of  its  original  Certificate  of  

Incorporation with the Secretary of State was June 13, 2014 under the name ASOthera Pharmaceuticals, Inc.  

2.  The Restated Certificate of Incorporation of the corporation attached hereto as  Exhibit “A”, which is incorporated 
herein by this reference, and which restates, integrates and further amends the provisions of the Certificate of Incorporation of 
this corporation as previously amended and/or restated, has been duly adopted by this corporation’s Board of Directors and by the 
stockholders  in  accordance  with  Sections  242  and  245  of  the  General  Corporation  Law  of  the  State  of  Delaware,  with  the 
approval of the corporation’s stockholders having been given by written consent without a meeting in accordance with Section 
228 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, this corporation has caused this Restated Certificate of Incorporation to be signed by its duly 

authorized officer and the foregoing facts stated herein are true and correct. 

Dated: June 21, 2019 

STOKE THERAPEUTICS, INC.

By: /s/ Edward M. Kaye  

Name: Edward M. Kaye

Title:  Chief Executive Officer

 
 
EXHIBIT “A”

STOKE THERAPEUTICS, INC.

RESTATED CERTIFICATE OF INCORPORATION

ARTICLE I: NAME

The name of the corporation is Stoke Therapeutics, Inc. (the “Corporation”). 

ARTICLE II: AGENT FOR SERVICE OF PROCESS

The address of the Corporation’s registered office in the State of Delaware is 3500 South Dupont Highway, in the City of 
Dover, County of Kent 19901.  The name of the registered agent of the Corporation at that address is Incorporating Services, Ltd.

ARTICLE III: PURPOSE

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under 

the General Corporation Law of the State of Delaware (the “General Corporation Law”).

ARTICLE IV: AUTHORIZED STOCK

1.  Total Authorized.  The total number of shares of all classes of stock that the Corporation has authority to issue is 
310,000,000 shares, consisting of two classes: 300,000,000 shares of Common Stock, $0.0001 par value per share (“Common 
Stock”), and 10,000,000 shares of Preferred Stock, $0.0001 par value per share (“Preferred Stock”).

2.  Designation of Additional Series.

2.1.  The  Board  of  Directors  of  the  Corporation  (the  “ Board”)  is  authorized,  subject  to  any  limitations 
prescribed by the law of the State of Delaware, to provide for the issuance of the shares of Preferred Stock in one or more series, 
and, by filing a Certificate of Designation pursuant to the applicable law of the State of Delaware (“Certificate of Designation”), 
to establish from time to time the number of shares to be included in each such series, to fix the designation, powers (including 
voting powers), preferences and relative, participating, optional or other special rights, if any, of the shares of each such series 
and any qualifications, limitations or restrictions thereof, and, except where otherwise provided in the applicable Certificate of 
Designation, to thereafter increase (but not above the total number of authorized shares of the Preferred Stock) or decrease (but 
not  below  the  number  of  shares  of  such  series  then  outstanding)  the  number  of  shares  of  any  such  series.    The  number  of 
authorized  shares  of  Preferred  Stock  may  also  be  increased  or  decreased  (but  not  below  the  number  of  shares  thereof  then 
outstanding)  by  the  affirmative  vote  of  the  holders  of  two-thirds  of  the  voting  power  of  all  of  the  then-outstanding  shares  of 
capital stock of the Corporation entitled to vote thereon, without a separate vote of the holders of the 

2

 
 
 
 
 
Preferred Stock, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law, unless a separate vote of the 
holders of one or more series is required pursuant to the terms of any Certificate of Designation; provided, however, that if two-
thirds  of  the  Whole  Board  (as  defined  below)  has  approved  such  increase  or  decrease  of  the  number  of  authorized  shares  of 
Preferred  Stock,  then  only  the  affirmative  vote  of  the  holders  of  a  majority  of  the  voting  power  of  all  of  the  then-outstanding 
shares of the capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single 
class, without a separate vote of the holders of the Preferred Stock (unless a separate vote of the holders of one or more series is 
required  pursuant  to  the  terms  of  any  Certificate  of  Designation),  shall  be  required  to  effect  such  increase  or  decrease.    For 
purposes of this Restated Certificate of Incorporation (as the same may be amended and/or restated from time to time, including 
pursuant the terms of any Certificate of Designation designating a series of Preferred Stock, this “Certificate of Incorporation”), 
the  term  “Whole  Board”  shall  mean  the  total  number  of  authorized  directors  whether  or  not  there  exist  any  vacancies  in 
previously authorized directorships.

2.2  Except  as  otherwise  expressly  provided  in  any  Certificate  of  Designation  designating  any  series  of  
Preferred  Stock  pursuant  to  the  foregoing  provisions  of  this  Article  IV,  any  new  series  of  Preferred  Stock  may  be  designated, 
fixed  and  determined  as  provided  herein  by  the  Board  without  approval  of  the  holders  of  Common  Stock  or  the  holders  of 
Pre(cid:0)ferred Stock, or any series thereof, and any such new series may have powers, preferences and rights, including, without 
limitation, voting powers, dividend rights, liquidation rights, redemption rights and conversion rights, senior to, junior to or pari
passu  with  the  rights  of  the  Common  Stock,  any  series  of  Preferred  Stock  or  any  future  class  or  series  of  capital  stock  of  the 
Corporation. 

2.3  Each  outstanding  share  of  Common  Stock  shall  entitle  the  holder  thereof  to  one  vote  on  each  matter  
properly submitted to the stockholders of the Corporation for their vote; provided, however, that, except as otherwise required by 
law,  holders of Common  Stock  shall  not  be  entitled  to  vote  on  any  amendment to this Certificate of Incorporation that relates 
solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either 
separately or together as a class with the holders of one or more other such series, to vote thereon pursuant to this Certificate of 
Incorporation.

ARTICLE V: AMENDMENT OF BYLAWS

The Board shall have the power to adopt, amend or repeal the Bylaws of the Corporation (as the same may be amended 
and/or restated from time to time, the “Bylaws”).  Any adoption, amendment or repeal of the Bylaws by the Board shall require 
the approval of a majority of the Whole Board.  The stockholders shall also have power to adopt, amend or repeal the Bylaws; 
provided,  however,  that  notwithstanding  any  other  provision  of  this  Certificate  of  Incorporation  or  any  provision  of  law  that 
might  otherwise  permit  a  lesser  or  no  vote,  but  in  addition  to  any  vote  of  the  holders  of  any  class  or  series  of  stock  of  the 
Corporation required by applicable law or by this Certificate of Incorporation, the affirmative vote of the holders of at least two-
thirds of the voting power of all of the then-outstanding shares of the capital stock of the Corporation entitled to vote generally in 
the election of directors, voting together as a single class, shall be required for the stockholders to adopt, amend or repeal any 
provision of the Bylaws; provided further, that, in the case of any proposed adoption, amendment or repeal of any provisions of 
the  Bylaws  that  is  approved  by  the  Board  and  submitted  to  the  stockholders  for  adoption  thereby,  if  two-thirds  of  the  Whole 
Board has approved such adoption, amendment or repeal of any provisions of the Bylaws, 

3

 
 
 
then only the affirmative vote of the holders of a majority of the voting power of all of the then-outstanding shares of the capital 
stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required 
to adopt, amend or repeal any provision of the Bylaws.

ARTICLE VI:  MATTERS RELATING TO THE BOARD OF DIRECTORS

1.  Director  Powers.    Except  as  otherwise  provided  by  the  General  Corporation  Law  or  this  Certificate  of 

Incorporation, the business and affairs of the Corporation shall be managed by or under the direction of the Board.  

2.  Number  of  Directors.    Subject  to  the  special  rights  of  the  holders  of  any  series  of  Preferred  Stock  to  elect 
additional directors under specified circumstances, the total number of directors constituting the Whole Board shall be fixed from 
time to time exclusively by resolution adopted by a majority of the Whole Board.

3.  Classified Board.    Subject  to  the  special  rights  of  the  holders  of  one  or  more  series  of  Preferred  Stock  to  elect 
additional directors under specified circumstances, the directors shall be divided, with respect to the time for which they severally 
hold office, into three classes designated as Class I, Class II and Class III, respectively (the “Classified Board”).  The Board may 
assign members of the Board already in office to the Classified Board.  The number of directors in each class shall be as nearly 
equal as is practicable.  The initial term of office of the Class I directors shall expire at the Corporation’s first annual meeting of 
stockholders following the closing of the Corporation’s initial public offering pursuant to an effective registration statement under 
the  Securities  Act  of  1933,  as  amended,  relating  to  the  offer  and  sale  of  Common  Stock  to  the  public  (the  “Initial  Public 
Offering”),  the  initial  term  of  office  of  the  Class  II  directors  shall  expire  at  the  Corporation’s  second  annual  meeting  of 
stockholders  following  the  closing  of  the  Initial  Pub(cid:0)lic  Offering  and  the  initial  term  of  office  of  the  Class  III  directors  shall 
expire  at  the  Corporation’s  third  annual  meeting  of  stockholders  following  the  closing  of  the  Initial  Public  Offering.    At  each 
annual meeting of stockholders following the closing of the Initial Public Offering, directors elected to succeed those directors of 
the  class  whose  terms  then  expire  shall  be  elected  for  a  term  of  office  expiring  at  the  third  succeeding  annual  meeting  of 
stockholders after their election. 

4.  Term and Removal.  Each director shall hold office until the annual meeting at which such director’s term expires 
and  until  such  director’s  succes(cid:0)sor  is  duly  elected  and  qualified,  or  until  such  director’s  earlier  death,  resignation, 
disqualification or removal.  Any director may resign by delivering a resignation in writing or by electronic transmission to the 
Corporation at its principal office or to the Chairperson of the Board, the Chief Executive Officer, or the Secretary.  Subject to the 
special rights of the holders of any series of Preferred Stock, no director may be removed from the Board except for cause and 
only  by  the  affirmative  vote  of  the  holders  of  at  least  two-thirds  of  the  voting  power  of  the  then-outstanding  shares  of  capital 
stock of the Corporation entitled to vote thereon, voting together as a single class. In the event of any increase or decrease in the 
authorized  number  of  directors,  (a)  each  director  then  serving  as  such  shall  nevertheless  continue  as  a  director  of  the  class  of 
which he or she is a member and (b) the newly created or eliminated directorships resulting from such increase or decrease shall 
be apportioned by the Board among the classes of directors so as to make all classes as nearly equal in number as is practicable, 

4

 
 
 
provided that no decrease in the number of directors constituting the Board shall shorten the term of any director. 

5.  Board Vacancies and Newly Created Directorships.  Subject to the special rights of the holders of any series of 
Preferred  Stock,  any  vacancy  occurring  in  the  Board  for  any  cause,  and  any  newly  created  directorship  resulting  from  any 
increase in the authorized number of directors, shall be filled only by the affirmative vote of a majority of the directors then in 
office,  even  if  less  than  a  quorum,  or  by  a  sole  remaining  director,  and  shall  not  be  filled  by  the  stockholders.    Any  director 
elected in accordance with the preceding sentence shall hold office for a term expiring at the annual meeting of stockholders at 
which the term of office of the class to which the director has been assigned expires and until such director’s successor shall have 
been duly elected and qualified, or until such director’s earlier death, resignation, disqualification or removal.   

6.  Vote by Ballot.  Election of directors need not be by written ballot unless the Bylaws shall so provide.

7.  Preferred Directors.  If and for so long as the holders of any series of Preferred Stock have the special right to 
elect additional directors, then upon commencement and for the duration of the period during which such right continues: (i) the 
then otherwise total authorized number of directors of the Corporation shall automatically be increased by such specified number 
of  directors,  and  the  holders  of  such  Preferred  Stock  shall  be  entitled  to  elect  the  additional  directors  so  provided  for  or  fixed 
pursuant to said provisions, and (ii) each such additional director shall serve until such director’s successor shall have been duly 
elected and qualified, or until such director’s right to hold such office terminates pursuant to said provisions, whichever occurs 
earlier, subject to his or her earlier death, resignation, retirement, disqualification or removal. Except as otherwise provided by 
the Board in the resolution or resolutions establishing such series, whenever the holders of any series of Preferred Stock having 
such right to elect additional directors are divested of such right pursuant to the provisions of such stock, the terms of office of all 
such  additional  directors  elected  by  the  holders  of  such  stock,  or  elected  to  fill  any  vacancies  resulting  from  the  death, 
resignation, disqualification or removal of such additional directors, shall forthwith terminate and the total authorized number of 
directors of the Corporation shall be reduced accordingly.

ARTICLE VII: DIRECTOR LIABILITY

1.  Limitation of Liability.  To the fullest extent permitted by law, no director of the Corporation shall be personally 
liable for monetary damages for breach of fiduciary duty as a director.  Without limiting the effect of the preceding sentence, if 
the General Corpo(cid:0)ration Law is hereafter amended to authorize the further elimination or limitation of the liability of a director, 
then  the  liability  of  a  director  of  the  Corporation  shall  be  eliminated  or  limited  to  the  fullest  extent  permitted  by  the  General 
Corporation Law, as so amended.

2.  Change in Rights.  Neither any amendment nor repeal of this Article VII, nor the adoption of any provision of this 
Certificate of Incorporation inconsistent with this Article VII, shall eliminate, reduce or otherwise adversely affect any limitation 
on the personal liability of a director of the Corporation existing at the time of such amendment, repeal or adoption of such an 
inconsistent provision.

5

 
 
 
ARTICLE VIII: MATTERS RELATING TO STOCKHOLDERS

1.  No  Action  by  Written  Consent  of  Stockholders.    Subject  to  the  rights  of  any  series  of  Preferred  Stock  then 
outstanding, no action shall be taken by the stockholders of the Corporation except at a duly called annual or special meeting of 
stockholders and no action shall be taken by the stockholders of the Corporation by written consent in lieu of a meeting.

2.  Special Meeting of Stockholders.  Special meetings of the stockholders of the Corporation may be called only by 
the  Chairperson  of  the  Board,  the  Chief  Executive  Officer,  the  Lead  Independent  Director  (as  defined  in  the  Bylaws),  the 
President, or the Board acting pursuant to a resolution adopted by a majority of the Whole Board and may not be called by the 
stockholders or any other person or persons.

3.  Advance Notice of Stockholder Nominations and Business Transacted at Spe(cid:0)cial Meetings.  Advance notice 
of stockholder nominations for the election of directors of the Corporation and of business to be brought by stockholders before 
any  meeting  of  stockholders  of  the  Corporation  shall  be  given  in  the  manner  provided  in  the  Bylaws.    Business  transacted  at 
special meetings of stockholders shall be limited to the purpose or purposes stated in the notice of meeting.

ARTICLE IX:  CHOICE OF FORUM

Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of 
Delaware, to the fullest extent permitted by law, shall be the sole and exclusive forum for: (a) any derivative action or proceeding 
brought on behalf of the Corporation; (b) any action asserting a claim of breach of a fiduciary duty owed by, or other wrongdoing 
by, any director, officer, stockholder, employee or agent of the Corporation to the Corporation or the Corporation’s stockholders; 
(c) any action asserting a claim against the Corporation arising pursuant to any provision of the General Corporation Law, this 
Certificate  of  Incorporation  or  the  Bylaws  or  as  to  which  the  General  Corporation  Law  confers  jurisdiction  on  the  Court  of 
Chancery  of  the  State  of  Delaware;  (d)  any  action  to  interpret,  apply,  enforce  or  determine  the  validity  of  this  Certificate  of 
Incorporation or the Bylaws; or (e) any action asserting a claim against the Corporation governed by the internal affairs doctrine. 

Any  person  or  entity  purchasing  or  otherwise  acquiring  or  holding  any  interest  in  shares  of  capital  stock  of  the 

Corporation shall be deemed to have notice of and to have consented to the provisions of this Article IX.

ARTICLE X:  AMENDMENT OF CERTIFICATE OF INCORPORATION

If  any  provision  of  this  Certificate  of  Incorporation  shall  be  held  to  be  invalid,  illegal,  or  unenforceable,  then  such 
provision  shall  nonetheless  be  enforced  to  the  maximum  extent  possible  consistent  with  such  holding  and  the  remaining 
provisions  of  this  Certificate  of  Incorporation  (including  without  limitation,  all  portions  of  any  section  of  this  Certificate  of 
Incorporation  containing  any  such  provision  held  to  be  invalid,  illegal,  or  unenforceable,  which  is  not  invalid,  illegal,  or 
unenforceable) shall remain in full force and effect.  

The Corporation reserves the right to amend or repeal any provision contained in this Certificate of Incorporation in the 

manner prescribed by the laws of the State of Delaware and all 

6

 
 
 
rights conferred upon stockholders are granted subject to this reservation; provided, however, that, notwithstanding any provision 
of this Certificate of Incorporation or any provision of law that might otherwise permit a lesser vote or no vote (but subject to 
Section 2 of Article IV hereof), but in addition to any vote of the holders of any class or series of the stock of the Corporation 
required  by  law  or  by  this  Certificate  of  Incorporation,  the  affirmative  vote  of  the  holders  of  at  least  two-thirds  of  the  voting 
power  of  all  of  the  then-outstanding  shares  of  the  capital  stock  of  the  Corporation  entitled  to  vote  generally  in  the  election  of 
directors, voting together as a single class, shall be required to amend or repeal any provision of this Certificate of Incorporation; 
provided,  further,  that  if  two-thirds  of  the  Whole  Board  has  approved  such  amendment  or  repeal  of  any  provisions  of  this 
Certificate of Incorporation, then only the affirmative vote of the holders of at least a majority of the voting power of all of the 
then-outstanding shares of capital stock of the Corporation entitled to vote generally in the election of directors, voting together 
as a single class (in addition to any other vote of the holders of any class or series of stock of the Corporation required by law of 
by this Certificate of Incorporation), shall be required to amend or repeal such provisions of this Certificate of Incorporation. 

* * * * * * * * * * *

7

 
 
 
 
CERTIFICATE OF AMENDMENT
OF 
RESTATED CERTIFICATE OF INCORPORATION
OF
STOKE THERAPEUTICS, INC.

Stoke  Therapeutics,  Inc.  (hereinafter  called  the  “Corporation”),  a  corporation  organized  and  existing  under  and  by 
virtue  of  the  General  Corporation  Law  of  the  State  of  Delaware  (the  “General  Corporation  Law”),  does  hereby  certify  as 
follows:

1. That the name of this Corporation is Stoke Therapeutics, Inc., and that this Corporation was originally incorporated 
pursuant  to  the  General  Corporation  Law  on  June  13,  2014  under  the  name  ASOthera  Pharmaceuticals,  Inc.    The  Restated 
Certificate of Incorporation of the Corporation was filed with the Secretary of State of the State of Delaware on June 21, 2019, as 
amended (the “Restated Charter”).

2. Amendment to Article VII. 

(a)   Article VII of the Restated Charter is hereby amended and restated in its entirety as follows:

“ARTICLE VII: LIMITATION OF LIABILITY

1.                  Limitation  of  Liability.    To  the  fullest  extent  permitted  by  law,  neither  a  director  of  the 
Corporation nor an officer of the corporation shall be personally liable to the Corporation or its stockholders for 
monetary damages for breach of fiduciary duty as a director or officer, as applicable.  Without limiting the effect 
of  the  preceding  sentence,  if  the  General  Corporation  Law  is  hereafter  amended  to  authorize  the  further 
elimination or limitation of the liability of a director or officer, then the liability of a director or officer of the 
Corporation shall be eliminated or limited to the fullest extent permitted by the General Corporation Law, as so 
amended.

2.         Change in Rights.  Neither any amendment nor repeal of this Article VII, nor the adoption of 
any  provision  of  this  Restated  Certificate  of  Incorporation  inconsistent  with  this  Article  VII,  shall  eliminate, 
reduce  or  otherwise  adversely  affect  any  limitation  on  the  personal  liability  of  a  director  or  officer  of  the 
Corporation existing at the time of such amendment, repeal or adoption of such an inconsistent provision.”

3.  That the foregoing amendment was duly adopted by the Board of Directors of the Corporation in accordance with 
Sections  141  and  242  of  the  General  Corporation  Law  and  was  approved  by  the  holders  of  the  requisite  number  of  shares  of 
capital stock of the Corporation. 

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Amendment on this 20th day of June, 2023. 

By: /s/ Edward M. Kaye___________                                             
Name:  Edward M. Kaye 
Title: Chief Executive Officer 

 
 
 
                    
 
Exhibit 4.2

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

As of December 31, 2020, Stoke Therapeutics, Inc. (the “Company,” “we,” or “our”) had one class of securities registered under Section 12 of 
the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock.

The  following  description  summarizes  the  most  important  terms  of  our  capital  stock  and  certain  provisions  of  our  restated  certificate  of 
incorporation and restated bylaws. Because it is only a summary, it does not contain all of the information that may be important to you. For a 
complete description, you should refer to our restated certificate of incorporation and restated bylaws, which are incorporated by reference as 
an exhibit to the Annual Report on Form 10-K of which this Exhibit 4.3 is a part, and to the provisions of applicable Delaware law.

Authorized Capital Stock

Our  authorized  capital  stock  consists  of  300,000,000  shares  of  common  stock,  $0.0001  par  value  per  share,  and  10,000,000  shares  of 
undesignated preferred stock, $0.0001 par value per share.

Common stock

Dividend rights

Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of our common stock are entitled 
to receive dividends out of funds legally available if our board of directors, in its discretion, determines to issue dividends and then only at the 
times and in the amounts that our board of directors may determine. 

Voting rights

Holders of our common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders. We have not 
provided for cumulative voting for the election of directors in our restated certificate of incorporation, which means that holders of a majority 
of the shares of our common stock are able to elect all of our directors. Our restated certificate of incorporation established a classified board 
of directors, divided into three classes with staggered three-year terms. Only one class of directors is elected at each annual meeting of our 
stockholders, with the other classes continuing for the remainder of their respective three-year terms.

No preemptive or similar rights

Our common stock is not entitled to preemptive rights, and is not subject to conversion, redemption or sinking fund provisions.

Right to receive liquidation distributions

Upon our liquidation, dissolution or winding-up, the assets legally available for distribution to our stockholders would be distributable ratably 
among  the  holders  of  our  common  stock  and  any  participating  preferred  stock  outstanding  at  that  time,  subject  to  prior  satisfaction  of  all 
outstanding debt and liabilities and the preferential rights of and the payment of liquidation preferences, if any, on any outstanding shares of 
preferred stock.

 
 
Preferred stock

Our board of directors is authorized, subject to limitations prescribed by Delaware law, to issue up to 10,000,000 shares of preferred stock in 
one  or  more  series,  to  establish  from  time  to  time  the  number  of  shares  to  be  included  in  each  series  and  to  fix  the  designation,  powers, 
preferences and rights of the shares of each series and any of their qualifications, limitations or restrictions, in each case without further vote 
or action by our stockholders. Our board of directors is also able to increase or decrease the number of shares of any series of preferred 
stock, but not below the number of shares of that series then outstanding, without any further vote or action by our stockholders. Our board of 
directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other 
rights of the holders of our common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions 
and  other  corporate  purposes,  could,  among  other  things,  have  the  effect  of  delaying,  deferring  or  preventing  a  change  in  control  of  our 
company  and  might  adversely  affect  the  market  price  of  our  common  stock  and  the  voting  and  other  rights  of  the  holders  of  our  common 
stock. We have no current plan to issue any shares of preferred stock.

Registration rights

Pursuant to the terms of a registration rights agreement to which we are party, certain of our investors are entitled to rights with respect to the 
registration  of  these  shares  under  the  Securities  Act  of  1933,  as  amended,  or  the  Securities  Act,  as  described  below.  We  refer  to  these 
shares collectively as registrable securities.

Form S-3 registration rights

Any holder or group of holders of at least 20% of then-outstanding registrable securities can request that we register all or part of their shares 
on Form S-3 if we are eligible to file a registration statement on Form S-3 and if the aggregate price to the public of the shares offered is at 
least  $1.0  million.  The  stockholders  may  only  require  us  to  effect  two  registration  statements  on  Form  S-3  in  a  12-month  period.  We  may 
postpone  taking  action  with  respect  to  such  filing  not  more  than  once  during  any  12-month  period  for  a  total  period  of  not  more  than  120 
days,  if  after  receiving  a  request  for  registration,  we  furnish  to  the  holders  requesting  such  registration  a  certificate  signed  by  our  Chief 
Executive  Officer  stating  that,  in  the  good  faith  judgment  of  our  board  of  directors,  it  would  be  materially  detrimental  to  us  and  our 
stockholders for such registration statement to be effected at such time.

The underwriters of any underwritten offering will have the right to limit the number of shares registered by these holders if they determine 
that marketing factors require limitation, in which case the number of shares to be registered will be apportioned, in proportion (as nearly as 
practicable), to the number of registrable securities owned by each holder or in such other proportion as shall mutually be agreed to by all 
such selling Holders. However, the number of shares to be registered by these holders cannot be reduced unless all other securities are first 
entirely excluded from the underwriting.

Expenses of registration rights

We generally will pay all expenses, other than underwriting discounts and commissions.

Expiration of registration rights

The registration rights described above will expire, with respect to any particular holder of these rights, on the earlier of the fifth anniversary 
of our initial public offering or with respect to each holder, such time as all registrable securities of such holder may be sold within a three-
month period pursuant to Rule 144.

Anti-takeover provisions

Certain provisions of Delaware General Corporation Law, or DGCL, our restated certificate of incorporation and our restated bylaws could 
have  the  effect  of  delaying,  deferring  or  discouraging  another  person  from  acquiring  control  of  our  company.  These  provisions,  which  are 
summarized below, may have the effect of 

2 

 
 
 
discouraging takeover bids. They are also designed, in part, to encourage persons seeking to acquire control of us to negotiate first with our 
board of directors. 

Delaware law

We are subject to the provisions of Section 203 of the DGCL regulating corporate takeovers. In general, 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 
date on which the person became an interested stockholder unless:

•

•

•

prior to the date of the transaction, the board of directors of the corporation approved either the business combination or the transaction 
which resulted in the stockholder becoming an interested stockholder;

the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, 
excluding  for  purposes  of  determining  the  voting  stock  outstanding,  but  not  the  outstanding  voting  stock  owned  by  the  interested 
stockholder, (i) shares owned by persons who are directors and also officers and (ii) shares owned by employee stock plans in which 
employee  participants  do  not  have  the  right  to  determine  confidentially  whether  shares  held  subject  to  the  plan  will  be  tendered  in  a
tender or exchange offer; or

at or subsequent to the date of the transaction, the business combination is approved by the board of directors of the corporation and 
authorized at an annual or special meeting of stockholders, and not by written consent, by the affirmative vote of at least 66.67% of the 
outstanding voting stock that is not owned by the interested stockholder.

Generally, a business combination includes a merger, asset or stock sale, or other transaction or series of transactions together resulting in a 
financial  benefit  to  the  interested  stockholder.  An  interested  stockholder  is  a  person  who,  together  with  affiliates  and  associates,  owns  or, 
within  three  years  prior  to  the  determination  of  interested  stockholder  status,  did  own  15%  or  more  of  a  corporation’s  outstanding  voting 
stock. 

Restated certificate of incorporation and restated bylaw provisions

Our restated certificate of incorporation and our restated bylaws include a number of provisions that could deter hostile takeovers or delay or 
prevent changes in control of our company, including the following:

•

•

•

Board of directors vacancies.  Our  restated  certificate  of  incorporation  and  restated  bylaws  authorize  only  our  board  of  directors  to  fill 
vacant directorships, including newly created seats. In addition, the number of directors constituting our board of directors is permitted to 
be set only by a resolution adopted by a majority vote of our entire board of directors. These provisions would prevent a stockholder 
from increasing the size of our board of directors and then gaining control of our board of directors by filling the resulting vacancies with 
its  own  nominees.  This  makes  it  more  difficult  to  change  the  composition  of  our  board  of  directors  but  promotes  continuity  of 
management.

Classified board. Our restated certificate of incorporation and restated bylaws provide that our board of directors is classified into three 
classes of directors, each with staggered three-year terms. A third party may be discouraged from making a tender offer or otherwise
attempting to obtain control of us as it is more difficult and time consuming for stockholders to replace a majority of the directors on a 
classified board of directors. 

Stockholder  action;  special  meetings  of  stockholders.  Our  restated  certificate  of  incorporation  provides  that  our  stockholders  may  not 
take  action  by  written  consent,  but  may  only  take  action  at  annual  or  special  meetings  of  our  stockholders.  As  a  result,  a  holder 
controlling a majority of our capital stock would not be able to amend our restated bylaws or remove directors without holding a meeting 
of our stockholders called in accordance with our restated bylaws. Further, our restated bylaws provide that 

3 

 
 
•

•

•

•

•

•

special meetings of our stockholders may be called only by a majority of our board of directors, the chairman of our board of directors, 
our Chief Executive Officer or our President, thus prohibiting a stockholder from calling a special meeting. 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.

Advance  notice  requirements  for  stockholder  proposals  and  director  nominations.  Our  restated  bylaws  provide  advance  notice 
procedures for stockholders seeking to bring business before our annual meeting of stockholders or to nominate candidates for election 
as  directors  at  our  annual  meeting  of  stockholders.  Our  restated  bylaws  also  specify  certain  requirements  regarding  the  form  and 
content of a stockholder’s notice. These provisions might preclude our stockholders from bringing matters before our annual meeting of 
stockholders or from making nominations for directors at our annual meeting of stockholders if the proper procedures are not followed. 
We expect that these provisions might also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the 
acquirer’s own slate of directors or otherwise attempting to obtain control of our company.

No cumulative voting.  The  DGCL  provides  that  stockholders  are  not  entitled  to  the  right  to  cumulate  votes  in  the  election  of  directors 
unless a corporation’s certificate of incorporation provides otherwise. Our restated certificate of incorporation and restated bylaws do not 
provide for cumulative voting.

Directors  removed  only  for  cause.  Our  restated  certificate  of  incorporation  provides  that  stockholders  may  remove  directors  only  for 
cause and only by the affirmative vote of the holders of at least two-thirds of our outstanding common stock.

Amendment of charter provisions. Any amendment of the above expected provisions in our restated certificate of incorporation requires 
approval by holders of at least two-thirds of our outstanding common stock.

Issuance of undesignated preferred stock. Our board of directors has the authority, without further action by the stockholders, to issue 
up to 10,000,000 shares of undesignated preferred stock with rights and preferences, including voting rights, designated from time to 
time by our board of directors. The existence of authorized but unissued shares of preferred stock would enable our board of directors to 
render more difficult or to discourage an attempt to obtain control of us by merger, tender offer, proxy contest or other means.

Choice of forum. Our restated certificate of incorporation provides that, to the fullest extent permitted by law, the Court of Chancery of 
the State of Delaware will be the exclusive forum for any derivative action or proceeding brought on our behalf; any action asserting a 
breach of fiduciary duty; any action asserting a claim against us arising pursuant to the DGCL, our restated certificate of incorporation or 
our  restated  bylaws;  or  any  action  asserting  a  claim  against  us  that  is  governed  by  the  internal  affairs  doctrine.  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. This exclusive forum provision does not 
apply to suits brought to enforce a duty or liability created by the Exchange Act. In addition, our restated bylaws provide that unless we 
consent in writing to the selection of an alternate forum, the federal district courts of the United States are the exclusive forum for the 
resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended. Nothing in our restated 
certificate of incorporation or restated bylaws precludes stockholders from asserting claims to enforce any liability or duty created by the 
Exchange Act, or any other claim for which the federal courts of the United States have exclusive jurisdiction.

Transfer agent and registrar

The transfer agent and registrar for our common stock is Equiniti Trust Company, LLC. 

4 

 
 
Nasdaq Global Select Market listing

Our common stock is traded on the Nasdaq Global Select Market under the symbol “STOK.”

5 

 
 
Exhibit 10.12

LEASE AGREEMENT

THIS  LEASE  AGREEMENT  (this  “Lease”)  is  made  this  8  day  of  September,  2021,  between  ARE‑MA  REGION  NO.  24,  LLC, a 

Delaware limited liability company (“Landlord”), and STOKE THERAPEUTICS, INC., a Delaware corporation (“Tenant”).

Building: 

45-47 Wiggins Avenue, Bedford, MA 01730 

Premises: 

That portion of (i) the Building known as Suite 200, containing approximately 23,000 rentable square feet (the “45 Wiggins 
Premises”), and (ii) the Building known as Suite 100, containing approximately 15,000 rentable square feet (the “47 
Wiggins Premises”), all as determined by Landlord, as shown on Exhibit A.

Project:  The real property on which the Building is located, together with all improvements thereon and appurtenances thereto as described 

on Exhibit B.

Base Rent: 

$52.00 per rentable square foot of the Premises per year

Rentable Area of 45 Wiggins Premises:  23,000 sq. ft.

Rentable Area of 47 Wiggins Premises:  15,000 sq. ft.

Rentable Area of Building:  38,000 sq. ft.

Rentable Area of Project:  171,154 sq. ft.

Tenant’s Share of Operating Expenses of Building:  100%  (60.53% with respect to the 45 Wiggins Premises and 39.47% with respect to 

the 47 Wiggins Premises)  

Building’s Share of Operating Expenses of Project:  13.44%

Security Deposit: $494,000.00

Rent Adjustment Percentage:  3%

Base  Term:  Beginning  on  the  Commencement  Date  with  respect  to  the  45  Wiggins  Premises  and  on  the  47  Wiggins  Premises  
Commencement Date with respect to the 47 Wiggins Premises, and ending with respect to the entire on December 
31, 2024.

Permitted Use: 

Research and development laboratory, related office and other related uses consistent with the character of the Project 

and otherwise in compliance with the provisions of Section 7 hereof. 

Address for Rent Payment:  Landlord’s Notice Address:
P.O. Box 37526 
Baltimore, MD 21297-3526  Pasadena, CA 91101

26 North Euclid Avenue

Attention: Corporate Secretary

Tenant’s Notice Address
45 Wiggins Avenue, Suite 200
Bedford, MA 01730
Attention:  Lease Administrator

 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 2

The following Exhibits and Addenda are attached hereto and incorporated herein by this reference:

[X]  EXHIBIT A - PREMISES DESCRIPTION 
[   ]  EXHIBIT C - INTENTIONALLY OMITTED 
[X]  EXHIBIT E - RULES AND REGULATIONS 

[X]  EXHIBIT B - DESCRIPTION OF PROJECT
[X]  EXHIBIT D - COMMENCEMENT DATE
[X]  EXHIBIT F - TENANT’S PERSONAL PROPERTY

1. Lease of Premises.  Upon and subject to all of the terms and conditions hereof, Landlord hereby leases the Premises to Tenant 
and  Tenant  hereby  leases  the  Premises  from  Landlord.    The  portions  of  the  Project  which  are  for  the  non-exclusive  use  of  tenants  of  the 
Project are collectively referred to herein as the “Common Areas.”  Landlord reserves the right to modify Common Areas, provided that such 
modifications  do  not  materially  adversely  affect  Tenant’s  use  of  the  Premises  for  the  Permitted  Use.    Landlord  shall  endeavor  to  provide 
Tenant with at least 30 days’ advance written notice of such modifications.  From and after the Commencement Date with respect to the 45 
Wiggins Premises and from and after the 47 Wiggins Premises Commencement Date with respect to the 47 Wiggins Premises, through the 
expiration of the Term, Tenant shall have access to the Building and the Premises 24 hours a day, 7 days a week, subject to the terms of this 
Lease.

2. Delivery; Acceptance of Premises; Commencement Date; 47 Wiggins Commencement Date.  

(a) 45  Wiggins  Premises.    The  “Commencement Date”  shall  be  the  day  immediately  following  the  expiration  of  the  Homology 
Lease (as defined below), which is schedule to occur on December 14, 2021.  Landlord and Tenant acknowledge that Tenant occupied the 
45  Wiggins  Premises  prior  to  the  Commencement  Date  pursuant  to  that  certain  sublease  agreement  between  Homology  Medicines,  Inc. 
(“Homology”), the current tenant of the 45 Wiggins Premises, pursuant to a sublease agreement between Tenant and Homology.

Except as otherwise expressly set forth in this Lease:  (i) Tenant shall accept the 45 Wiggins Premises in their “as-is” condition as of 
the  Commencement  Date;  (ii)  Landlord  shall  have  no  obligation  for  any  defects  in  the  45  Wiggins  Premises;  and  (iii)  Tenant’s  taking 
possession of the 45 Wiggins Premises shall be conclusive evidence that Tenant accepts the 45 Wiggins Premises.  

(b) 47 Wiggins Premises.  Landlord shall use reasonable efforts to deliver the 47 Wiggins Premises to Tenant on or before April 1, 
2022.    If  Landlord  fails  to  timely  deliver  the  47  Wiggins  Premises,  Landlord  shall  not  be  liable  to  Tenant  for  any  loss  or  damage  resulting 
therefrom, and this Lease shall not be void or voidable except as provided herein.  If Landlord does not deliver the 47 Wiggins Premises to 
Tenant by October 1, 2022 for any reason other than Force Majeure (as defined in Section 34), this Lease with respect to the 47 Wiggins 
Premises may be terminated by Tenant by written notice to Landlord, and if so terminated by Tenant, neither Landlord nor Tenant shall have 
any further rights, duties or obligations under this Lease with respect to the 47 Wiggins Premises, except with respect to provisions which 
expressly  survive  termination  of  this  Lease.    If  Tenant  does  not  elect  to  terminate  this  Lease  with  respect  to  the  47  Wiggins  Premises  by 
October 15, 2022, such right to terminate this Lease with respect to the 47 Wiggins Premises shall be waived and this Lease shall remain in 
full  force  and  effect.    For  the  avoidance  of  doubt,  if  this  Lease  with  respect  to  the  47  Wiggins  Premises  is  terminated  pursuant  to  this 
paragraph, this Lease shall remain in effect with respect to the 45 Wiggins Premises and the parties shall enter into an amendment to this 
Lease to reflect the termination of this Lease with respect to the 47 Wiggins Premises.

The “47 Wiggins Premises Commencement Date” shall be the date Landlord delivers the 47 Wiggins Premises to Tenant.  The 
“47  Wiggins  Premises  Rent  Commencement  Date”  shall  be  the  later  of:    (i)    the  date  that  is  30  days  after  the  47  Wiggins  Premises 
Commencement  Date,  and  (ii)  the  date  on  which  Landlord’s  Work  has  been  substantially  completed.    The  period  commencing  on  the  47 
Wiggins Premises Commencement Date through the day immediately preceding the 47 Wiggins Premises Rent Commencement Date may 
be referred to herein as the “47 Wiggins Abatement Period.”  As used herein, “Landlord’s Work”  shall  mean  (i)  the  replacement  of  two 
RTUs serving the office portion of the 47 Wiggins Premises with new “like for kind” units, and (ii) the replacement of three MUAs serving the 
laboratory portion 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 3

of the 47 Wiggins Premises with new “like for kind” units.  Landlord shall perform Landlord’s Work at Landlord’s cost and in accordance with 
applicable Legal Requirements (as defined in Section 7).

Except as otherwise expressly set forth in this Lease:  (i) Tenant shall accept the 47 Wiggins Premises in their “as-is” condition as of 
the 47 Wiggins Premises Commencement Date; (ii) Landlord shall have no obligation for any defects in the 47 Wiggins Premises; and (iii) 
Tenant’s taking possession of the 47 Wiggins Premises shall be conclusive evidence that Tenant accepts the 47 Wiggins Premises.

For  the  period  of  30  consecutive  days  after  the  47  Wiggins  Premises  Commencement  Date,  Landlord  shall,  at  its  sole  cost  and 
expense  (which  shall  not  constitute  an  Operating  Expense),  be  responsible  for  any  repairs  that  are  required  to  be  made  to  the  Building 
Systems (as defined in Section 13) solely serving the 47 Wiggins Premises, unless Tenant or any Tenant Party was responsible for the cause 
of such repair, in which case Tenant shall pay the cost.

(c) General. Upon request of Landlord, Tenant shall execute and deliver a written acknowledgment of the Commencement Date, 
the 47 Wiggins Premises Commencement Date, the 47 Wiggins Premises Rent Commencement Date and the expiration date of the Term 
when such are established in the form of the “Acknowledgement of Commencement Date” attached to this Lease as Exhibit D;  provided, 
however, Tenant’s failure to execute and deliver such acknowledgment shall not affect Landlord’s rights hereunder.  The “Term” of this Lease 
shall be the Base Term, as defined above on the first page of this Lease and the Extension Term which Tenant may elect pursuant to Section 
39 hereof.

Upon  the  execution  and  delivery  of  this  Lease  by  Landlord  and  Tenant,  Landlord  shall  make  available  to  Tenant  a  tenant 
improvement  allowance  of  up  to  $5.00  per  rentable  square  foot  of  the  Premises  (the  “Improvement  Allowance”).    The  Improvement 
Allowance  may  be  applied  to  hard  and  soft  costs  incurred  in  connection  with  the  design  and  construction  of  fixed  and  permanent 
improvements  in  the  Premises  desired  by  Tenant  and  reasonably  acceptable  to  Landlord  (the  “Premises Improvements”).    Tenant  shall 
engage  directly  with  architects  and  contractors  to  plan  and  construct  the  Premises  Improvements  and  the  design,  construction  and 
completion of the Premises Improvements shall be Tenant’s responsibility.  Tenant acknowledges that upon the expiration of the Term of the 
Lease, the Premises Improvements shall become the property of Landlord and may not be removed by Tenant.  Tenant shall pay to Landlord 
an  administration  fee  equal  to  1%  of  the  cost  of  the  Premises  Improvements  for  monitoring  and  inspecting  the  Premises  Improvements, 
which administration fee shall be payable out of the Improvement Allowance.  Except for the Improvement Allowance, Tenant shall be solely 
responsible for all of the costs of the Premises Improvements.  During the course of design and construction of the Premises Improvements, 
Landlord shall reimburse Tenant for the cost of the Tenant Improvements not more than once a month against a draw request in Landlord’s 
standard form, containing evidence of payment of the applicable costs and lien waivers (including a conditional lien release for each progress 
payment and unconditional lien releases for the prior month’s progress payments), to the extent of Landlord’s approval thereof for payment, 
no  later  than  30  days  following  receipt  of  such  draw  request.    Upon  completion  of  the  Premises  Improvements  (and  prior  to  any  final 
disbursement of the Improvement Allowance) Tenant shall deliver to Landlord the following items: (i)  statements setting forth the names of all 
contractors and subcontractors who did work on the Premises Improvements and final lien waivers from all such contractors; and (ii) “as built” 
plans or marked-up construction drawings for the Premises Improvements.  Landlord shall be entitled to receive the benefit of all construction 
warranties and manufacturer’s equipment warranties relating to equipment installed in the Premises as part of the Premises Improvements.  
Notwithstanding the foregoing, if the cost of the Premises Improvements exceeds the Improvement Allowance, Tenant shall be required to 
pay  such  excess  prior  to  the  distribution  of  the  then-remaining  unpaid  TI  Allowance.    Tenant  shall  have  no  right  to  any  portion  of  the
Improvement Allowance that is not requested for disbursement by Tenant pursuant to the terms set forth above for the payment of Premises 
Improvements costs prior to the date that is 12 months after the 47 Wiggins Premises Commencement Date, provided that to the extent that, 
following  the  47  Wiggins  Premises  Commencement  Date,  there  exists  a  Force  Majeure  event  that  restricts  construction  activities  in  the 
Bedford, Massachusetts area, which precludes the construction of the Premises Improvements, then such 12-month period shall be delayed 
1 day for each day that such Force Majeure event preclude Tenant’s construction of the Premises Improvements.

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 4

Tenant acknowledges that Landlord shall require access to (i) portions of the 47 Wiggins Premises after the 47 Wiggins Premises 
Commencement  Date  in  order  to  complete  Landlord’s  Work,  and  (ii)  to  portions  of  the  Premises  in  order  to  perform  the  Premises 
Improvements.  Landlord and its contractors and agents shall, upon reasonable prior notice to Tenant, have the right to enter the 47 Wiggins 
Premises to perform Landlord’s Work and the Premises to perform the Premises Improvements, and Tenant shall reasonably cooperate with 
Landlord in connection with the same, at no cost or liability to Tenant.  Tenant acknowledges that Landlord’s performance of Landlord’s Work 
and/or  the  Premises  Improvements  may  adversely  affect  Tenant’s  use  and  occupancy  of  the  Premises.    Tenant  waives  all  claims  against 
Landlord for rent abatement in connection with Landlord’s Work and the Premises Improvements.

Tenant agrees and acknowledges that neither Landlord nor any agent of Landlord has made any representation or warranty with 
respect to the condition of all or any portion of the Premises or the Project, and/or the suitability of the Premises or the Project for the conduct 
of  Tenant’s  business,  and  Tenant  waives  any  implied  warranty  that  the  Premises  or  the  Project  are  suitable  for  the  Permitted  Use.    This 
Lease constitutes the complete agreement of Landlord and Tenant with respect to the subject matter hereof and supersedes any and all prior 
representations,  inducements,  promises,  agreements,  understandings  and  negotiations  which  are  not  contained  herein.    Landlord  in 
executing this Lease does so in reliance upon Tenant’s representations, warranties, acknowledgments and agreements contained herein.

3. Rent.

(a) Base Rent.  Base Rent for the month in which the Commencement Date occurs (or, if the Commencement Date does not occur 
on the first day of a calendar month, Base Rent for the first full calendar month following the Commencement Date) and the Security Deposit
shall be due and payable concurrently with Tenant’s delivery of an executed copy of this Lease to Landlord. Base Rent for the month in which 
the 47 Wiggins Premises Rent Commencement Date occurs (or, if the 47 Wiggins Premises Rent Commencement Date does not occur on 
the first day of a calendar month, Base Rent for the first full calendar month following the 47 Wiggins Premises Rent Commencement Date) 
shall  be  due  and  payable  on  the  47  Wiggin  Premises  Commencement  Date.    Tenant  shall  pay  to  Landlord  in  advance,  without  demand, 
abatement, deduction or set-off, monthly installments of Base Rent on or before the first day of each calendar month during the Term hereof 
after the Commencement Date with respect to the 45 Wiggins Premises and after the 47 Wiggins Premises Rent Commencement Date with 
respect to the 47 Wiggins Premises, in lawful money of the United States of America, at the office of Landlord for payment of Rent set forth 
above, or to such other person or at such other place as Landlord may from time to time designate in writing, or via federally insured wire 
transfer (including ACH) pursuant to the wire instructions provided by Landlord.  Payments of Base Rent for any fractional calendar month 
shall be prorated.  The obligation of Tenant to pay Base Rent and other sums to Landlord and the obligations of Landlord under this Lease 
are  independent  obligations.    Tenant  shall  have  no  right  at  any  time  to  abate,  reduce,  or  set-off  any  Rent  (as  defined  in  Section  5)  due 
hereunder except for any abatement as may be expressly provided in this Lease.  

(b) Additional  Rent.    In  addition  to  Base  Rent,  Tenant  agrees  to  pay  to  Landlord  as  additional  rent  (“Additional  Rent”):    (i) 
commencing on the Commencement Date with respect to the 45 Wiggins Premises and on the 47 Wiggins Premises Commencement Date 
with  respect  to  the  47  Wiggins  Premises,  Tenant’s  Share  of  “Operating  Expenses”  (as  defined  in  Section  5),  and  (ii)  any  and  all  other 
amounts Tenant assumes or agrees to pay under the provisions of this Lease, including, without limitation, any and all other sums that may 
become due by reason of any default of Tenant or failure to comply with the agreements, terms, covenants and conditions of this Lease to be 
performed by Tenant, after any applicable notice and cure period.

4. Base Rent Adjustments.  Base Rent shall be increased on each annual anniversary of the Commencement Date (provided, 
however, that if the Commencement Date occurs on a day other than the first day of a calendar month, then Base Rent shall be increased on 
each  annual  anniversary  of  the  first  day  of  the  first  full  calendar  month  immediately  following  the  Commencement  Date)  (each  an 
“Adjustment Date”)  by  multiplying  the  Base  Rent  payable  immediately  before  such  Adjustment  Date  by  the  Rent  Adjustment  Percentage 
and adding the resulting amount to the Base Rent payable immediately before such 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 5

Adjustment Date.  Base Rent, as so adjusted, shall thereafter be due as provided herein.  Base Rent adjustments for any fractional calendar 
month shall be prorated.  

5. Operating Expense Payments.  Landlord shall deliver to Tenant a written estimate of Operating Expenses for each calendar 
year during the Term (the “Annual Estimate”), which may be revised by Landlord from time to time during such calendar year.  Commencing 
on the Commencement Date with respect to the 45 Wiggins Premises and on the 47 Wiggins Premises Commencement Date with respect to 
the 47 Wiggins Premises, and continuing thereafter on the first day of each month during the Term, Tenant shall pay Landlord an amount 
equal to 1/12th of Tenant’s Share of the Annual Estimate.  Payments for any fractional calendar month shall be prorated.

The term “Operating Expenses”  means  all  costs  and  expenses  of  any  kind  or  description  whatsoever  incurred  or  accrued  each 
calendar year by Landlord with respect to the Building (including the Building’s Share of all costs and expenses of any kind or description 
incurred or accrued by Landlord with respect to the Project which are not specific to the Building or any building at the Project not containing 
Project  Amenities)  including,  without  duplication,  (i)  Taxes  (as  defined  in  Section  9),  (ii)  the  cost  (including,  without  limitation,  any 
commercially reasonable subsidies which Landlord may provide in connection with the Project Amenities) of the common area amenities (the 
“Project Amenities”) now or hereafter located at the Project after revenues from the Project Amenities realized by Landlord or its affiliates, if 
any, are applied against such costs, (iii) transportation services (including the Shuttle Service Costs (as defined in Section 41(o))), (iv) capital 
repairs, improvements and replacements amortized over the lesser of 10 years and the useful life of such capital repairs, improvements and 
replacements, and (v) the costs of Landlord’s third party property manager or, if there is no third party property manager, administration rent 
in  the  amount  of  3%  of  Base  Rent  (provided  that  during  the  47  Wiggins  Abatement  Period,  Tenant  shall  nonetheless  be  required  to  pay 
administration rent each month equal to the amount of the administration rent that Tenant would have been required to pay in the absence of 
there being an 47 Wiggins Abatement Period), excluding only:

(a) the original construction costs of the Project and renovation prior to the date of this Lease and costs of correcting defects in such 

original construction or renovation;

(b) capital expenditures for expansion of the Project;

(c) interest, principal payments of Mortgage (as defined in Section 27) debts of Landlord, financing costs and amortization of funds 

borrowed by Landlord, whether secured or unsecured;

(d) depreciation of the Project (except for capital improvements, the cost of which are includable in Operating Expenses);

(e) advertising, legal and space planning expenses and leasing commissions and other costs and expenses incurred in procuring 
and leasing space to tenants for the Project, including any leasing office maintained in the Project, free rent and construction allowances for 
tenants;

(f) legal and other expenses incurred in the negotiation or enforcement of leases;

(g) completing, fixturing, improving, renovating, painting, redecorating or other work, which Landlord pays for or performs for other 

tenants within their premises, and costs of correcting defects in such work;

(h) costs  to  be  reimbursed  by  other  tenants  of  the  Project  or  Taxes  to  be  paid  directly  by  Tenant  or  other  tenants  of  the  Project, 

whether or not actually paid;

(i) salaries,  wages,  benefits  and  other  compensation  paid  to  (i)  personnel  of  Landlord  or  its  agents  or  contractors  above  the 
position  of  the  person,  regardless  of  title,  who  has  day-to-day  management  responsibility  for  the  Project  or  (ii)  officers  and  employees  of 
Landlord or its affiliates who are not assigned 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 6

in  whole  or  in  part  to  the  operation,  management,  maintenance  or  repair  of  the  Project;  provided,  however,  that  with  respect  to  any  such 
person who does not devote substantially all of his or her employed time to the Project, the salaries, wages, benefits and other compensation 
of  such  person  shall  be  prorated  to  reflect  time  spent  on  matters  related  to  operating,  managing,  maintaining  or  repairing  the  Project  in 
comparison to the time spent on matters unrelated to operating, managing, maintaining or repairing the Project;

(j) general organizational, administrative and overhead costs relating to maintaining Landlord’s existence, either as a corporation, 

partnership, or other entity, including general corporate, legal and accounting expenses;

(k) costs  (including  attorneys’  fees  and  costs  of  settlement,  judgments  and  payments  in  lieu  thereof)  incurred  in  connection  with 
disputes  with  tenants,  other  occupants,  or  prospective  tenants,  and  costs  and  expenses,  including  legal  fees,  incurred  in  connection  with 
negotiations or disputes with employees, consultants, management agents, leasing agents, purchasers or mortgagees of the Building;

(l) costs incurred by Landlord due to the violation by Landlord, its employees, agents or contractors or any tenant of the terms and 

conditions of any lease of space in the Project or any Legal Requirement (as defined in Section 7);

(m)penalties, fines or interest incurred as a result of Landlord’s inability or failure to make payment of Taxes and/or to file any tax or 
informational returns when due, or from Landlord’s failure to make any payment of Taxes required to be made by Landlord hereunder before 
delinquency;

(n) overhead and profit increment paid to Landlord or to subsidiaries or affiliates of Landlord for goods and/or services in or to the 

Project to the extent the same exceeds the costs of such goods and/or services rendered by unaffiliated third parties on a competitive basis;

(o) costs of Landlord’s charitable or political contributions, or of fine art maintained at the Project;

(p) costs in connection with services (including electricity), items or other benefits of a type which are not standard for the Project 
and which are not available to Tenant without specific charges therefor, but which are provided to another tenant or occupant of the Project, 
whether or not such other tenant or occupant is specifically charged therefor by Landlord;

(q) costs incurred in the sale or refinancing of the Project;

(r) net income taxes of Landlord or the owner of any interest in the Project, franchise, capital stock, gift, estate or inheritance taxes 

or any federal, state or local documentary taxes imposed against the Project or any portion thereof or interest therein; and

(s) any expenses otherwise includable within Operating Expenses to the extent actually reimbursed by persons other than tenants 

of the Project under leases for space in the Project.

In addition, notwithstanding anything to the contrary contained in this Lease, Operating Expenses incurred or accrued by Landlord with 
respect to any capital improvements which are reasonably expected by Landlord to reduce overall Operating Expenses (for example, without 
limitation, by reducing energy usage at the Project) (the “Energy Savings Costs”)  shall  be  amortized  over  a  period  of  years  equal  to  the 
least of (A) 10 years, (B) the useful life of such capital items, or (C) the quotient of (i) the Energy Savings Costs, divided by (ii) the annual 
amount of Operating Expenses reasonably expected by Landlord to be saved as a result of such capital improvements.

Within 90 days after the end of each calendar year (or such longer period as may be reasonably required), Landlord shall furnish to 
Tenant a statement (an “Annual Statement”) showing in reasonable detail:  (a) the total and Tenant’s Share of actual Operating Expenses 
for the previous calendar year, and 

 
 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 7

(b) the total of Tenant’s payments in respect of Operating Expenses for such year.  If Tenant’s Share of actual Operating Expenses for such 
year exceeds Tenant’s payments of Operating Expenses for such year, the excess shall be due and payable by Tenant as Rent within 30 
days after delivery of such Annual Statement to Tenant.  If Tenant’s payments of Operating Expenses for such year exceed Tenant’s Share of 
actual Operating Expenses for such year Landlord shall pay the excess to Tenant within 30 days after delivery of such Annual Statement, 
except that after the expiration, or earlier termination of the Term or if Tenant is delinquent in its obligation to pay Rent, Landlord shall pay the 
excess  to  Tenant  after  deducting  all  other  amounts  due  Landlord.    Landlord’s  and  Tenant’s  obligations  to  pay  any  overpayments  or 
deficiencies due pursuant to this paragraph shall survive the expiration or earlier termination of this Lease.

The Annual Statement shall be final and binding upon Tenant unless Tenant, within 120 days after Tenant’s receipt thereof, shall
contest any item therein by giving written notice to Landlord, specifying each item contested and the reason therefor.  If, during such 120 day 
period,  Tenant  reasonably  and  in  good  faith  questions  or  contests  the  accuracy  of  Landlord’s  statement  of  Tenant’s  Share  of  Operating 
Expenses,  Landlord  will  provide  Tenant  with  access  to  Landlord’s  books  and  records  relating  to  the  operation  of  the  Project  and  such 
information as Landlord reasonably determines to be responsive to Tenant’s questions (the “Expense Information”).  If after Tenant’s review 
of such Expense Information, Landlord and Tenant cannot agree upon the amount of Tenant’s Share of Operating Expenses, then Tenant 
shall have the right to have an independent regionally or nationally recognized public accounting firm selected by Tenant and approved by 
Landlord (which approval shall not be unreasonably withheld or delayed), working pursuant to a fee arrangement other than a contingent fee 
(at Tenant’s sole cost and expense), audit and/or review the Expense Information for the year in question (the “Independent Review”).  The 
results  of  any  such  Independent  Review  shall  be  binding  on  Landlord  and  Tenant.    If  the  Independent  Review  shows  that  the  payments 
actually  made  by  Tenant  with  respect  to  Operating  Expenses  for  the  calendar  year  in  question  exceeded  Tenant’s  Share  of  Operating 
Expenses for such calendar year, Landlord shall at Landlord’s option either (i) credit the excess amount to the next succeeding installments 
of  estimated  Operating  Expenses  or  (ii)  pay  the  excess  to  Tenant  within  30  days  after  delivery  of  such  statement,  except  that  after  the 
expiration or earlier termination of this Lease or if Tenant is delinquent in its obligation to pay Rent, Landlord shall pay the excess to Tenant 
after  deducting  all  other  amounts  due  Landlord.    If  the  Independent  Review  shows  that  Tenant’s  payments  with  respect  to  Operating 
Expenses for such calendar year were less than Tenant’s Share of Operating Expenses for the calendar year, Tenant shall pay the deficiency 
to  Landlord  within  30  days  after  delivery  of  such  statement.    If  the  Independent  Review  shows  that  Tenant  has  overpaid  with  respect  to 
Operating  Expenses  by  more  than  5%  then  Landlord  shall  reimburse  Tenant  for  all  costs  incurred  by  Tenant  for  the  Independent  Review.  
Operating Expenses for the calendar years in which Tenant’s obligation to share therein begins and ends shall be prorated.  Notwithstanding 
anything set forth herein to the contrary, if the Building is not at least 95% occupied on average during any year of the Term, Tenant’s Share 
of Operating Expenses for such year shall be computed as though the Building had been 95% occupied on average during such year. 

“Tenant’s Share”  shall  be  the  percentage  set  forth  on  the  first  page  of  this  Lease  as  Tenant’s  Share  of  Operating  Expenses  of 
Building, and “Building’s Share” shall be the percentage set forth on page 1 as the Building’s Share of Operating Expenses of Project, each 
as may be reasonably adjusted by Landlord for changes in the physical size of the Premises, Building or the Project occurring thereafter.  
Landlord may equitably increase Tenant’s Share for any item of expense or cost reimbursable by Tenant that relates to a repair, replacement, 
or service that benefits only the Premises or only a portion of the Project that includes the Premises or that varies with occupancy or use.  
Base Rent, Tenant’s Share of Operating Expenses and all other amounts payable by Tenant to Landlord hereunder are collectively referred 
to herein as “Rent.”  

6. Security Deposit.  Tenant shall deposit with Landlord, upon delivery of an executed copy of this Lease to Landlord, a security 
deposit (the “Security Deposit”) for the performance of all of Tenant’s obligations hereunder in the amount set forth on page 1 of this Lease, 
which  Security  Deposit  shall  be  in  the  form  of  an  unconditional  and  irrevocable  letter  of  credit  (the  “Letter  of  Credit”):    (i)  in  form  and 
substance satisfactory to Landlord, (ii) naming Landlord as beneficiary, (iii) expressly allowing Landlord to draw upon it at any time from time 
to  time  by  delivering  to  the  issuer  notice  that  Landlord  is  entitled  to  draw  thereunder,  (iv)  issued  by  an  FDIC-insured  financial  institution 
satisfactory  to  Landlord,  and  (v)  redeemable  by  presentation  of  a  sight  draft  in  the  state  of  Landlord’s  choice.    If  Tenant  does  not  provide 
Landlord with a 

 
 
 
 
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substitute Letter of Credit complying with all of the requirements hereof at least 5 days before the stated expiration date of any then current 
Letter of Credit, Landlord shall have the right to draw the full amount of the current Letter of Credit and hold the funds drawn in cash without 
obligation for interest thereon as the Security Deposit.  The Security Deposit shall be held by Landlord as security for the performance of 
Tenant’s obligations under this Lease.  The Security Deposit is not an advance rental deposit or a measure of Landlord’s damages in case of 
Tenant’s default.  Upon each occurrence of a Default (as defined in Section 20), Landlord may use all or any part of the Security Deposit to 
pay delinquent payments due under this Lease, future rent damages, and the cost of any damage, injury, expense or liability caused by such 
Default, without prejudice to any other remedy provided herein or provided by law.  Landlord’s right to use the Security Deposit under this 
Section 6 includes the right to use the Security Deposit to pay future rent damages following the termination of this Lease pursuant to Section 
21(c) below.  Upon any use of all or any portion of the Security Deposit, Tenant shall pay Landlord on demand the amount that will restore the
Security Deposit to the amount set forth on Page 1 of this Lease.  Tenant hereby waives the provisions of any law, now or hereafter in force 
which provide that Landlord may claim from a security deposit only those sums reasonably necessary to remedy defaults in the payment of 
Rent,  to  repair  damage  caused  by  Tenant  or  to  clean  the  Premises,  it  being  agreed  that  Landlord  may,  in  addition,  claim  those  sums 
reasonably necessary to compensate Landlord for any other loss or damage, foreseeable or unforeseeable, caused by the act or omission of 
Tenant  or  any  officer,  employee,  agent  or  invitee  of  Tenant.    Upon  bankruptcy  or  other  debtor-creditor  proceedings  against  Tenant,  the 
Security Deposit shall be deemed to be applied first to the payment of Rent and other charges due Landlord for periods prior to the filing of 
such proceedings.  If Tenant shall fully perform every provision of this Lease to be performed by Tenant, the Security Deposit, or any balance 
thereof  (i.e.,  after  deducting  therefrom  all  amounts  to  which  Landlord  is  entitled  under  the  provisions  of  this  Lease),  shall  be  returned  to 
Tenant (or, at Landlord’s option, to the last assignee of Tenant’s interest hereunder) within 90 days after the expiration or earlier termination 
of this Lease.

If  Landlord  transfers  its  interest  in  the  Project  or  this  Lease,  Landlord  shall  either  (a)  transfer  any  Security  Deposit  then  held  by 
Landlord to a person or entity assuming Landlord’s obligations under this Section 6, or (b) return to Tenant any Security Deposit then held by 
Landlord and remaining after the deductions permitted herein.  Upon such transfer to such transferee or the return of the Security Deposit to 
Tenant, Landlord shall have no further obligation with respect to the Security Deposit, and Tenant’s right to the return of the Security Deposit 
shall apply solely against Landlord’s transferee.  The Security Deposit is not an advance rental deposit or a measure of Landlord’s damages 
in  case  of  Tenant’s  default.    Landlord’s  obligation  respecting  the  Security  Deposit  is  that  of  a  debtor,  not  a  trustee,  and  no  interest  shall 
accrue thereon.

7. Use.  The Premises shall be used solely for the Permitted Use set forth in the basic lease provisions on page 1 of this Lease, 
and in compliance with all laws, orders, judgments, ordinances, regulations, codes, directives, permits, licenses, covenants and restrictions 
now  or  hereafter  applicable  to  the  Premises,  and  to  the  use  and  occupancy  thereof,  including,  without  limitation,  the  Americans  With 
Disabilities  Act,  42  U.S.C.  §  12101,  et  seq.  (together  with  the  regulations  promulgated  pursuant  thereto,  “ADA”)  (collectively,  “Legal 
Requirements”  and  each,  a  “Legal Requirement”).    Tenant  shall,  upon  5  days’  written  notice  from  Landlord,  discontinue  any  use  of  the 
Premises  which  is  declared  by  any  Governmental  Authority  (as  defined  in  Section  9)  having  jurisdiction  to  be  a  violation  of  a  Legal 
Requirement.  Tenant will not use or permit the Premises to be used for any purpose or in any manner that would void Tenant’s or Landlord’s 
insurance, increase the insurance risk, or cause the disallowance of any sprinkler or other credits.  Tenant shall not permit any part of the 
Premises to be used as a “place of public accommodation”, as defined in the ADA or any similar legal requirement.  Tenant shall reimburse 
Landlord promptly upon demand for any additional premium charged for any such insurance policy by reason of Tenant’s failure to comply
with the provisions of this Section or otherwise caused by Tenant’s use and/or occupancy of the Premises.  Tenant will use the Premises in a 
careful, safe and proper manner and will not commit or permit waste, overload the floor or structure of the Premises, subject the Premises to 
use that would damage the Premises or obstruct or interfere with the rights of Landlord or other tenants or occupants of the Project, including 
conducting or giving notice of any auction, liquidation, or going out of business sale on the Premises, or using or allowing the Premises to be 
used for any unlawful purpose.  Tenant shall cause any equipment or machinery to be installed in the Premises so as to reasonably prevent 
sounds or vibrations from the Premises from extending into Common Areas, or other space in the Project.  Tenant shall not 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 9

place  any  machinery  or  equipment  which  would  overload  the  floor  in  or  upon  the  Premises  or  transport  or  move  such  items  through  the 
Common  Areas  of  the  Project  or  in  the  Project  elevators  without  the  prior  written  consent  of  Landlord.    Tenant  shall  not,  without  the  prior 
written consent of Landlord, use the Premises in any manner which will require ventilation, air exchange, heating, gas, steam, electricity or 
water  beyond  the  existing  capacity  of  the  Project  as  proportionately  allocated  to  the  Premises  based  upon  Tenant’s  Share  as  usually 
furnished for the Permitted Use.

Landlord shall be responsible, at Landlord’s cost, for the compliance of the Common Areas of the Project with Legal Requirements 
(including the ADA) as of the Commencement Date.  Following the Commencement Date, Landlord shall, as an Operating Expense (to the 
extent such Legal Requirement is generally applicable to similar buildings in the area in which the Project is located) and at Tenant’s expense 
(to the extent such Legal Requirement is triggered by reason of Tenant’s, as compared to other tenants of the Project, particular use of the 
Premises, the Premises Improvements or Tenant’s Alterations) make any alterations or modifications to the Common Areas or the exterior of 
the Building that are required by Legal Requirements.  Except as otherwise expressly provided in the 2 immediately preceding sentences, 
Tenant,  at  its  sole  expense,  shall  make  any  alterations  or  modifications  to  the  interior  of  the  Premises  that  are  required  by  Legal 
Requirements (including, without limitation, compliance of the Premises with the ADA) related to Tenant’s use or occupancy of the Premises.  
Notwithstanding any other provision herein to the contrary, Tenant shall be responsible for any and all demands, claims, liabilities, losses, 
costs,  expenses,  actions,  causes  of  action,  damages  or  judgments,  and  all  reasonable  expenses  incurred  in  investigating  or  resisting  the 
same (including, without limitation, reasonable attorneys’ fees, charges and disbursements and costs of suit) (collectively, “Claims”) arising 
out of or in connection with Legal Requirements related to Tenant’s particular use or occupancy of the Premises, the Premises Improvements 
or Tenant’s Alterations, and Tenant shall indemnify, defend, hold and save Landlord harmless from and against any and all Claims arising out 
of or in connection with any failure of the Premises to comply with any Legal Requirement related to Tenant’s particular use or occupancy of 
the Premises or Tenant’s Alterations. 

Tenant  acknowledges  that  Landlord  may,  but  shall  not  be  obligated  to,  seek  to  obtain  Leadership  in  Energy  and  Environmental 
Design (LEED), WELL Building Standard, or other similar “green” certification with respect to the Project and/or the Premises, and Tenant 
agrees,  at  no  material  cost  to  Tenant,  to  reasonably  cooperate  with  Landlord,  and  to  provide  such  information  and/or  documentation  as 
Landlord may reasonably request, in connection therewith.

8. Holding Over.  If, with Landlord’s express written consent, Tenant retains possession of the Premises after the termination of 
the Term, (i) unless otherwise agreed in such written consent, such possession shall be subject to immediate termination by Landlord at any 
time, (ii) all of the other terms and provisions of this Lease (including, without limitation, the adjustment of Base Rent pursuant to Section 4 
hereof) shall remain in full force and effect (excluding any expansion or renewal option or other similar right or option) during such holdover 
period, (iii) Tenant shall continue to pay Base Rent in the amount payable upon the date of the expiration or earlier termination of this Lease 
or  such  other  amount  as  Landlord  may  indicate,  in  Landlord’s  sole  and  absolute  discretion,  in  such  written  consent,  and  (iv)  all  other 
payments  shall  continue  under  the  terms  of  this  Lease.    If  Tenant  remains  in  possession  of  the  Premises  after  the  expiration  or  earlier 
termination of the Term without the express written consent of Landlord, (A) Tenant shall become a tenant at sufferance upon the terms of 
this Lease except that the monthly rental shall be equal to 150% of Rent in effect during the last 30 days of the Term, and (B) if Tenant’s 
holding over continues in excess of 30 days, Tenant shall be responsible for all damages suffered by Landlord resulting from or occasioned 
by Tenant’s holding over, including consequential damages; provided, however, that if Tenant delivers a written inquiry to Landlord within 30 
days  prior  to  the  expiration  or  earlier  termination  of  the  Term,  Landlord  will  notify  Tenant  whether  the  potential  exists  for  consequential 
damages.  No holding over by Tenant, whether with or without consent of Landlord, shall operate to extend this Lease except as otherwise 
expressly provided, and this Section 8 shall not be construed as consent for Tenant to retain possession of the Premises.  Acceptance by 
Landlord  of  Rent  after  the  expiration  of  the  Term  or  earlier  termination  of  this  Lease  shall  not  result  in  a  renewal  or  reinstatement  of  this 
Lease.

9. Taxes.  Landlord shall pay, as part of Operating Expenses, all taxes, levies, fees, assessments and governmental charges of 

any kind, existing as of the Commencement Date or thereafter 

 
 
 
 
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enacted  (collectively  referred  to  as  “Taxes”),  imposed  by  any  federal,  state,  regional,  municipal,  local  or  other  governmental  authority  or 
agency,  including,  without  limitation,  quasi-public  agencies  (collectively,  “Governmental  Authority”)  during  the  Term,  including,  without 
limitation, all Taxes:  (i) imposed on or measured by or based, in whole or in part, on rent payable to (or gross receipts received by) Landlord 
under this Lease and/or from the rental by Landlord of the Project or any portion thereof, or (ii) based on the square footage, assessed value 
or other measure or evaluation of any kind of the Premises or the Project, or (iii) assessed or imposed by or on the operation or maintenance 
of any portion of the Premises or the Project, including parking, or (iv) assessed or imposed by, or at the direction of, or resulting from Legal 
Requirements, or interpretations thereof, promulgated by any Governmental Authority, or (v) imposed as a license or other fee, charge, tax, 
or assessment on Landlord’s business or occupation of leasing space in the Project.  Landlord may contest by appropriate legal proceedings 
the amount, validity, or application of any Taxes or liens securing Taxes.  Taxes shall not include any net income taxes imposed on Landlord 
except to the extent such net income taxes are in substitution for any Taxes payable hereunder.  If any such Tax is levied or assessed directly 
against Tenant, then Tenant shall be responsible for and shall pay the same at such times and in such manner as the taxing authority shall 
require.  Tenant shall pay, prior to delinquency, any and all Taxes levied or assessed against any personal property or trade fixtures placed by 
Tenant in the Premises, whether levied or assessed against Landlord or Tenant.  If any Taxes on Tenant’s personal property or trade fixtures 
are  levied  against  Landlord  or  Landlord’s  property,  or  if  the  assessed  valuation  of  the  Project  is  increased  by  a  value  attributable  to 
improvements in or alterations to the Premises, whether owned by Landlord or Tenant and whether or not affixed to the real property so as to 
become  a  part  thereof,  higher  than  the  base  valuation  on  which  Landlord  from  time-to-time  allocates  Taxes  to  all  tenants  in  the  Project, 
Landlord shall have the right, but not the obligation, to pay such Taxes.  Landlord’s determination of any excess assessed valuation shall be 
binding  and  conclusive,  absent  manifest  error.    The  amount  of  any  such  payment  by  Landlord  shall  constitute  Additional  Rent  due  from
Tenant to Landlord immediately upon demand.

10. Parking.    Subject  to  all  matters  of  record,  Force  Majeure,  a  Taking  (as  defined  in  Section  19  below)  and  the  exercise  by 
Landlord of its rights hereunder, Tenant shall have the right, at no additional cost during the Term (including the Extension Term), in common 
with other tenants of the Project pro rata in accordance with the rentable area of the Premises and the rentable areas of the Project occupied 
by such other tenants, to park in those areas designated for non-reserved parking on a first come first served basis, subject in each case to 
Landlord’s rules and regulations.  Tenant’s pro rata share of parking spaces is equal to 2.5 parking spaces per 1,000 rentable square feet of 
the Premises.  Landlord shall not be responsible for enforcing Tenant’s parking rights against any third parties, including other tenants of the 
Project.  Landlord shall have the right, exercisable by notice to Tenant given at any time during the Term, to relocate all or a portion of the 
parking  spaces  made  available  to  Tenant  hereunder  to  another  location  within  an  approximately  2-minute  walk  of  the  Project;  provided, 
however, that any reallocation shall be applied equitably and proportionately among Tenant and the other tenants of the Project. 

11. Utilities, Services. 

(a) General.  Landlord shall provide, subject to the terms of this Section 11, water, electricity, heat, light, power, sewer, and other 
utilities (including gas and fire sprinklers to the extent the Project is plumbed for such services), and, with respect to the Common Areas of 
the Project, refuse and trash collection and janitorial services (collectively, “Utilities”).  Landlord shall pay, as Operating Expenses or subject 
to Tenant’s reimbursement obligation, for all Utilities used on the Premises, Tenant’s Share of all maintenance charges for Utilities, and any 
storm sewer charges or other similar charges for Utilities imposed by any Governmental Authority or Utility provider, and Tenant’s Share of 
any  taxes,  penalties,  surcharges  or  similar  charges  thereon.    Tenant  shall  pay  directly  to  the  Utility  provider,  prior  to  delinquency,  any 
separately metered Utilities and services which may be furnished to Tenant or the Premises during the Term.  Tenant shall pay, as part of 
Operating Expenses, its share of all charges for jointly metered Utilities based upon consumption, as reasonably determined by Landlord.  
No interruption or failure of Utilities, from any cause whatsoever other than Landlord’s gross negligence or willful misconduct, shall result in 
eviction or constructive eviction of Tenant, termination of this Lease or the abatement of Rent.  Tenant agrees to limit use of water and sewer 
with  respect  to  Common  Areas  to  normal  restroom  use.    Utilities  shall  be  available  to  the  Premises  24  hours  per  day,  7  days  per  week, 
except in the case of emergencies, as the 

 
 
 
 
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result of Legal Requirements, the failure of any Utility provider to provide such Utilities, the performance by Landlord or any Utility provider of 
any installation, maintenance or repairs, or any other temporary interruptions.  Tenant shall be responsible for obtaining and paying for its 
own janitorial services for the Premises.

Tenant agrees to provide Landlord with access to Tenant’s water and/or energy usage data on a monthly basis, either by providing 
Tenant’s  applicable  utility  login  credentials  to  Landlord’s  Measurabl  online  portal,  or  by  another  delivery  method  reasonably  agreed  to  by 
Landlord and Tenant.  The costs and expenses incurred by Landlord in connection with receiving and analyzing such water and/or energy 
usage  data  (including,  without  limitation,  as  may  be  required  pursuant  to  applicable  Legal  Requirements)  shall  be  included  as  part  of 
Operating Expenses.

(b) Generator.    Landlord’s  sole  obligation  for  either  providing  emergency  generators  or  providing  emergency  back-up  power  to 
Tenant shall be: (i) to provide emergency generators with not less than the capacity of the emergency generators located in the Building as of 
the Commencement Date, and (ii) to contract with a third party to maintain the emergency generators as per the manufacturer’s standard 
maintenance guidelines.  Landlord shall have no obligation to provide Tenant with operational emergency generators or back-up power or to 
supervise,  oversee  or  confirm  that  the  third  party  maintaining  the  emergency  generators  is  maintaining  the  generators  as  per  the 
manufacturer’s  standard  guidelines  or  otherwise.    During  any  period  of  replacement,  repair  or  maintenance  of  the  emergency  generators 
when  the  emergency  generators  are  not  operational,  including  any  delays  thereto  due  to  the  inability  to  obtain  parts  or  replacement 
equipment, Landlord shall have no obligation to provide Tenant with an alternative back-up generator or generators or alternative sources of 
back-up  power.    Tenant  expressly  acknowledges  and  agrees  that  Landlord  does  not  guaranty  that  such  emergency  generators  will  be 
operational at all times or that emergency power will be available to the Premises when needed.

(c) Loading Dock.  Tenant may use the loading dock exclusively serving the Premises 24 hours per day, 7 days per week, subject 

to downtime to maintenance and repairs.

12. Alterations  and  Tenant’s  Property.    Any  alterations,  additions,  or  improvements  made  to  the  Premises  by  or  on  behalf  of 
Tenant,  including  additional  locks  or  bolts  of  any  kind  or  nature  upon  any  doors  or  windows  in  the  Premises,  but  excluding  installation, 
removal  or  realignment  of  furniture  systems  (other  than  removal  of  furniture  systems  owned  or  paid  for  by  Landlord)  not  involving  any 
modifications  to  the  structure  or  connections  (other  than  by  ordinary  plugs  or  jacks)  to  Building  Systems  (as  defined  in  Section  13) 
(“Alterations”) shall be subject to Landlord’s prior written consent, which may be given or withheld in Landlord’s sole discretion if any such 
Alteration affects the structure or Building Systems and shall not be otherwise unreasonably withheld, conditioned or delayed.  Tenant may 
construct nonstructural Alterations in the Premises without Landlord’s prior approval if the aggregate cost of all such work in any 12 month 
period does not exceed $30,000.00 (a “Notice-Only Alteration”), provided Tenant notifies Landlord in writing of such intended Notice-Only 
Alteration, and such notice shall be accompanied by plans, specifications, work contracts and such other information concerning the nature 
and  cost  of  the  Notice-Only  Alteration  as  may  be  reasonably  requested  by  Landlord,  which  notice  and  accompanying  materials  shall  be 
delivered  to  Landlord  not  less  than  15  business  days  in  advance  of  any  proposed  construction.    If  Landlord  approves  any  Alterations, 
Landlord may impose such conditions on Tenant in connection with the commencement, performance and completion of such Alterations as 
Landlord may deem appropriate in Landlord’s sole and absolute discretion.  Any request for approval shall be in writing, delivered not less 
than 15 business days in advance of any proposed construction, and accompanied by plans, specifications, bid proposals, work contracts 
and  such  other  information  concerning  the  nature  and  cost  of  the  alterations  as  may  be  reasonably  requested  by  Landlord,  including  the 
identities and mailing addresses of all persons performing work or supplying materials.  Landlord’s right to review plans and specifications 
and to monitor construction shall be solely for its own benefit, and Landlord shall have no duty to ensure that such plans and specifications or 
construction  comply  with  applicable  Legal  Requirements.    Tenant  shall  cause,  at  its  sole  cost  and  expense,  all  Alterations  to  comply  with 
insurance  requirements  and  with  Legal  Requirements  and  shall  implement  at  its  sole  cost  and  expense  any  alteration  or  modification 
required  by  Legal  Requirements  as  a  result  of  any  Alterations.    Tenant  shall  pay  to  Landlord,  as  Additional  Rent,  on  demand,  an  amount 
equal to the reasonable out-of-pocket costs incurred by Landlord with respect to each Alteration.  

 
 
 
 
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Before Tenant begins any Alteration, Landlord may post on and about the Premises notices of non-responsibility pursuant to applicable law.  
Tenant shall reimburse Landlord for, and indemnify and hold Landlord harmless from, any expense incurred by Landlord by reason of faulty 
work done by Tenant or its contractors, delays caused by such work, or inadequate cleanup.  

Tenant  shall  furnish  security  or  make  other  arrangements  satisfactory  to  Landlord  to  assure  payment  for  the  completion  of  all 
Alterations work free and clear of liens, and shall provide (and cause each contractor or subcontractor to provide) certificates of insurance for 
workers’ compensation and other coverage in amounts and from an insurance company satisfactory to Landlord protecting Landlord against 
liability for personal injury or property damage during construction.  Upon completion of any Alterations, Tenant shall deliver to Landlord:  (i) 
sworn  statements  setting  forth  the  names  of  all  contractors  and  subcontractors  who  did  the  work  and  final  lien  waivers  from  all  such 
contractors and subcontractors; and (ii) “as built” plans for any such Alteration.

Except for Removable Installations (as hereinafter defined), all Installations (as hereinafter defined) shall be and shall remain the 
property of Landlord during the Term and following the expiration or earlier termination of the Term, shall not be removed by Tenant at any 
time  during  the  Term,  and  shall  remain  upon  and  be  surrendered  with  the  Premises  as  a  part  thereof.    Notwithstanding  the  foregoing, 
Landlord may, at the time its approval of any such Installation is requested, or at the time it receives notice of a Notice-Only Alteration or at 
the  time  it  receives  notice  of  a  Notice-Only  Alteration,,  notify  Tenant  that  Landlord  requires  that  Tenant  remove  such  Installation  upon  the 
expiration  or  earlier  termination  of  the  Term,  in  which  event  Tenant  shall  remove  such  Installation  in  accordance  with  the  immediately 
succeeding sentence.  Upon the expiration or earlier termination of the Term, Tenant shall remove (i) all wires, cables or similar equipment 
which  Tenant  has  installed  in  the  Premises  or  in  the  risers  or  plenums  of  the  Building,  (ii)  any  Installations  for  which  Landlord  has  given 
Tenant notice of removal in accordance with the immediately preceding sentence, and (iii) all of Tenant’s Property (as hereinafter defined), 
and Tenant shall restore and repair any damage caused by or occasioned as a result of such removal, including, without limitation, capping 
off all such connections behind the walls of the Premises and repairing any holes.  During any restoration period beyond the expiration or 
earlier termination of the Term, Tenant shall pay Rent to Landlord as provided herein as if said space were otherwise occupied by Tenant.  If 
Landlord is requested by Tenant or any lender, lessor or other person or entity claiming an interest in any of Tenant’s Property to waive any 
lien  Landlord  may  have  against  any  of  Tenant’s  Property,  and  Landlord  consents  to  such  waiver,  then  Landlord  shall  be  entitled  to 
reimbursement from Tenant for its actual, reasonable out-of-pocket costs incurred in connection with the preparation and negotiation of each 
such waiver of lien.  

For purposes of this Lease, (x) “Removable Installations” means any items listed on Exhibit F attached hereto and any items agreed 
by  Landlord  in  writing  to  be  included  on  Exhibit F  in  the  future,  (y)  ”Tenant’s Property”  means  Removable  Installations  and,  other  than 
Installations,  any  personal  property  or  equipment  of  Tenant  that  may  be  removed  without  material  damage  to  the  Premises,  and  (z) 
”Installations” means all property of any kind paid for by Landlord, all Alterations, all fixtures, and all partitions, hardware, built-in machinery, 
built-in casework and cabinets and other similar additions, equipment, property and improvements built into the Premises so as to become an 
integral part of the Premises, including, without limitation, fume hoods which penetrate the roof or plenum area, built-in cold rooms, built-in 
warm  rooms,  walk-in  cold  rooms,  walk-in  warm  rooms,  deionized  water  systems,  glass  washing  equipment,  autoclaves,  chillers,  built-in 
plumbing, electrical and mechanical equipment and systems, and any power generator and transfer switch.

13. Landlord’s  Repairs.    Landlord,  as  an  Operating  Expense,  shall  maintain  all  of  the  structural,  exterior,  parking  and  other 
Common Areas of the Project, including HVAC, plumbing, fire sprinklers, elevators and all other building systems serving the Premises and 
other portions of the Project (“Building Systems”), in good repair, reasonable wear and tear and uninsured losses and damages caused by 
Tenant, or by any of Tenant’s assignees, sublessees, licensees, agents, servants, employees, invitees and contractors (or any of Tenant’s 
assignees,  sublessees  and/or  licensees  respective  agents,  servants,  employees,  invitees  and  contractors)  (collectively,  “Tenant  Parties”) 
excluded.  Losses and damages caused by Tenant or any Tenant Party shall be repaired by Landlord, to the extent not covered by insurance, 
at Tenant’s sole cost and expense.  Landlord reserves the right to stop Building Systems 

 
 
 
 
 
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services when necessary (i) by reason of accident or emergency, or (ii) for planned repairs, alterations or improvements, which are, in the 
judgment  of  Landlord,  desirable  or  necessary  to  be  made,  until  said  repairs,  alterations  or  improvements  shall  have  been  completed.  
Landlord  shall  have  no  responsibility  or  liability  for  failure  to  supply  Building  Systems  services  during  any  such  period  of  interruption; 
provided,  however,  that  Landlord  shall,  except  in  case  of  emergency,  make  a  commercially  reasonable  effort  to  give  Tenant  48  hours 
advance  notice  of  any  planned  stoppage  of  Building  Systems  services  for  routine  maintenance,  repairs,  alterations  or  improvements.  
Landlord shall use reasonable efforts to minimize interference with Tenant’s operations in the Premises during such planned stoppages of 
Building Systems.  Tenant shall promptly give Landlord written notice of any repair required by Landlord pursuant to this Section, after which 
Landlord shall make a commercially reasonable effort to effect such repair within a reasonable period (taking into account the nature of the 
repairs or maintenance).  Landlord shall not be liable for any failure to make any repairs or to perform any maintenance unless such failure 
shall persist for an unreasonable time (taking into account the nature of the repairs or maintenance) after Tenant’s written notice of the need 
for such repairs or maintenance.  Tenant waives its rights under any state or local law to terminate this Lease or to make such repairs at 
Landlord’s expense and agrees that the parties’ respective rights with respect to such matters shall be solely as set forth herein.  Repairs 
required as the result of fire, earthquake, flood, vandalism, war, or similar cause of damage or destruction shall be controlled by Section 18.

14. Tenant’s Repairs.  Subject to Section 13 hereof, Tenant, at its expense, shall repair, replace and maintain in good condition all 
portions of the Premises, including, without limitation, entries, doors, ceilings, interior windows, interior walls, and the interior side of demising 
walls.    Such  repair  and  replacement  may  include  capital  expenditures  and  repairs  whose  benefit  may  extend  beyond  the  Term.    Should 
Tenant  fail  to  make  any  such  repair  or  replacement  or  fail  to  maintain  the  Premises,  Landlord  shall  give  Tenant  notice  of  such  failure.    If 
Tenant fails to commence cure of such failure within 10 days of Landlord’s notice, and thereafter diligently prosecute such cure to completion,
Landlord may perform such work and shall be reimbursed by Tenant within 10 days after demand therefor; provided, however, that if such
failure by Tenant creates or could create an emergency, Landlord may immediately commence cure of such failure and shall thereafter be 
entitled to recover the costs of such cure from Tenant.  Subject to Sections 17 and 18, Tenant shall bear the full uninsured cost of any repair 
or replacement to any part of the Project that results from damage caused by Tenant or any Tenant Party and any repair that benefits only the 
Premises.

15. Mechanic’s Liens.  Tenant shall discharge, by bond or otherwise, any mechanic’s lien filed against the Premises or against the 
Project for work claimed to have been done for, or materials claimed to have been furnished to, Tenant within 10 days after the filing thereof, 
at  Tenant’s  sole  cost  and  shall  otherwise  keep  the  Premises  and  the  Project  free  from  any  liens  arising  out  of  work  performed,  materials 
furnished or obligations incurred by Tenant.  Should Tenant fail to discharge any lien described herein, Landlord shall have the right, but not 
the obligation, to pay such claim or post a bond or otherwise provide security to eliminate the lien as a claim against title to the Project and 
the cost thereof shall be immediately due from Tenant as Additional Rent.  If Tenant shall lease or finance the acquisition of office equipment, 
furnishings, or other personal property of a removable nature utilized by Tenant in the operation of Tenant’s business, Tenant warrants that 
any Uniform Commercial Code Financing Statement filed as a matter of public record by any lessor or creditor of Tenant will upon its face or
by  exhibit  thereto  indicate  that  such  Financing  Statement  is  applicable  only  to  removable  personal  property  of  Tenant  located  within  the 
Premises.  In no event shall the address of the Project be furnished on the statement without qualifying language as to applicability of the lien 
only to removable personal property, located in an identified suite held by Tenant.

16. Indemnification.  Tenant hereby indemnifies and agrees to defend, save and hold Landlord, its officers, directors, employees, 
managers,  agents,  sub-agents,  constituent  entities  and  lease  signators  (collectively,  “Landlord  Indemnified  Parties”)  harmless  from  and 
against any and all Claims for injury or death to persons or damage to property occurring within or about the Premises or the Project arising 
directly or indirectly out of use or occupancy of the Premises or the Project by Tenant or any Tenant Parties (including, without limitation, any 
act, omission or neglect by Tenant or any Tenant’s Parties in or about the Premises or at the Project) or a breach or default by Tenant in the 
performance of any of its obligations hereunder, except to the extent caused by the willful misconduct or negligence of Landlord 

 
 
 
 
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Indemnified  Parties.    Landlord  shall  not  be  liable  to  Tenant  for,  and  Tenant  assumes  all  risk  of  damage  to,  personal  property  (including, 
without limitation, loss of records kept within the Premises).  Tenant further waives any and all Claims for injury to Tenant’s business or loss 
of  income  relating  to  any  such  damage  or  destruction  of  personal  property  (including,  without  limitation,  any  loss  of  records).    Landlord 
Indemnified Parties shall not be liable for any damages arising from any act, omission or neglect of any tenant in the Project or of any other 
third  party  or  Tenant  Parties.    Notwithstanding  the  foregoing,  in  no  event  shall  Tenant  be  required  to  indemnify  any  Landlord  Indemnified 
Parties for Claims to the extent caused by the negligence or willful misconduct of any of the Landlord Indemnified Parties.

17. Insurance.  Landlord shall maintain all risk property and, if applicable, sprinkler damage insurance covering the full replacement 
cost of the Project.  Landlord shall further procure and maintain commercial general liability insurance with a single loss limit of not less than 
$2,000,000  for  bodily  injury  and  property  damage  with  respect  to  the  Project.    Landlord  may,  but  is  not  obligated  to,  maintain  such  other 
insurance and additional coverages as it may deem necessary, including, but not limited to, flood, environmental hazard and earthquake, loss 
or failure of building equipment, errors and omissions, rental loss during the period of repair or rebuilding, workers’ compensation insurance 
and  fidelity  bonds  for  employees  employed  to  perform  services  and  insurance  for  any  improvements  installed  by  Tenant  or  which  are  in 
addition  to  the  standard  improvements  customarily  furnished  by  Landlord  without  regard  to  whether  or  not  such  are  made  a  part  of  the 
Project.  All such insurance shall be included as part of the Operating Expenses.  The Project may be included in a blanket policy (in which 
case the cost of such insurance allocable to the Project will be determined by Landlord based upon the insurer’s cost calculations).  Tenant 
shall also reimburse Landlord for any increased premiums or additional insurance which Landlord reasonably deems necessary as a result of 
Tenant’s use of the Premises.  

Tenant, at its sole cost and expense, shall maintain during the Term:  all risk property insurance with business interruption and extra 
expense  coverage,  covering  the  full  replacement  cost  of  all  property  and  improvements  installed  or  placed  in  the  Premises  by  Tenant  at 
Tenant’s expense; workers’ compensation insurance with no less than the minimum limits required by law; employer’s liability insurance with 
employers  liability  limits  of  $1,000,000  bodily  injury  by  accident  –  each  accident,  $1,000,000  bodily  injury  by  disease  –  policy  limit,  and 
$1,000,000  bodily  injury  by  disease  –  each  employee;  and  commercial  general  liability  insurance,  with  a  minimum  limit  of  not  less  than 
$3,000,000 per occurrence for bodily injury and property damage with respect to the Premises.  The commercial general liability insurance 
maintained by Tenant shall name Alexandria Real Estate Equities, Inc., and Landlord, its officers, directors, employees, managers, agents, 
sub-agents,  constituent  entities  and  lease  signators  (collectively,  “Landlord  Insured  Parties”),  as  additional  insureds;  insure  on  an 
occurrence and not a claims-made basis; be issued by insurance companies which have a rating of not less than policyholder rating of A and 
financial category rating of at least Class X in “Best’s Insurance Guide”; shall not be cancelable for nonpayment of premium unless 10 days 
prior  written  notice  shall  have  been  given  to  Landlord  from  the  insurer;  not  contain  a  hostile  fire  exclusion;  contain  a  contractual  liability 
endorsement; and provide primary coverage to Landlord Insured Parties (any policy issued to Landlord Insured Parties providing duplicate or 
similar  coverage  shall  be  deemed  excess  over  Tenant’s  policies,  regardless  of  limits).    Certificates  of  insurance  showing  the  limits  of 
coverage required hereunder and showing Landlord as an additional insured, along with reasonable evidence of the payment of premiums 
for the applicable period, shall be delivered to Landlord by Tenant (i) concurrent with Tenant’s delivery to Landlord of a copy of this Lease 
executed by Tenant, and (ii) prior to each renewal of said insurance.  Tenant’s policy may be a “blanket policy” with an aggregate per location 
endorsement which specifically provides that the amount of insurance shall not be prejudiced by other losses covered by the policy.  Tenant 
shall, at least 5 days prior to the expiration of such policies, furnish Landlord with renewal certificates.

In each instance where insurance is to name Landlord as an additional insured, Tenant shall upon written request of Landlord also 
designate and furnish certificates so evidencing Landlord as additional insured to:  (i) any lender of Landlord holding a security interest in the 
Project or any portion thereof, (ii) the landlord under any lease wherein Landlord is tenant of the real property on which the Project is located, 
if the interest of Landlord is or shall become that of a tenant under a ground or other underlying lease rather than that of a fee owner, and/or 
(iii) any management company retained by Landlord to manage the Project.

 
 
 
 
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The property insurance obtained by Landlord and Tenant shall include a waiver of subrogation by the insurers and all rights based 
upon  an  assignment  from  its  insured,  against  Landlord  or  Tenant,  and  their  respective  officers,  directors,  employees,  managers,  agents, 
invitees and contractors (“Related Parties”), in connection with any loss or damage thereby insured against.  Neither party nor its respective 
Related Parties shall be liable to the other for loss or damage caused by any risk insured against under property insurance required to be 
maintained hereunder, and each party waives any claims against the other party, and its respective Related Parties, for such loss or damage.  
The failure of a party to insure its property shall not void this waiver.  Landlord and its respective Related Parties shall not be liable for, and 
Tenant hereby waives all claims against such parties for, business interruption and losses occasioned thereby sustained by Tenant or any 
person claiming through Tenant resulting from any accident or occurrence in or upon the Premises or the Project from any cause whatsoever.  
If the foregoing waivers shall contravene any law with respect to exculpatory agreements, the liability of Landlord or Tenant shall be deemed 
not released but shall be secondary to the other’s insurer.

Landlord  may  require  insurance  policy  limits  to  be  raised  to  conform  with  requirements  of  Landlord’s  lender  and/or  to  bring 
coverage limits to levels then being generally required of new tenants within the Project; provided, however, that the increased amount of 
coverage is consistent with coverage amounts then being required by institutional owners of similar projects with tenants occupying similar 
size premises in the geographical area in which the Project is located.

18. Restoration.  If, at any time during the Term, the Project or the Premises are damaged or destroyed by a fire or other casualty, 
Landlord shall notify Tenant within 60 days after discovery of such damage as to the amount of time Landlord reasonably estimates it will 
take to restore the Project or the Premises, as applicable (the “Restoration Period”).  If the Restoration Period is estimated to exceed 12 
months (the “Maximum Restoration Period”), Landlord may, in such notice, elect to terminate this Lease as of the date that is 75 days after 
the date of discovery of such damage or destruction; provided, however, that notwithstanding Landlord’s election to restore, Tenant may elect
to  terminate  this  Lease  by  written  notice  to  Landlord  delivered  within  5  business  days  of  receipt  of  a  notice  from  Landlord  (i)  estimating  a 
Restoration  Period  for  the  Premises  longer  than  the  Maximum  Restoration  Period  or  (ii)  indicating  that  the  Maximum  Restoration  Period 
would end during the final 9 months of the Term.  Unless either Landlord or Tenant so elects to terminate this Lease, Landlord shall, subject 
to receipt of sufficient insurance proceeds (with any deductible to be treated as a current Operating Expense), promptly restore the Premises 
(excluding  the  improvements  installed  by  Tenant  or  by  Landlord  and  paid  for  by  Tenant),  subject  to  delays  arising  from  the  collection  of 
insurance proceeds, from Force Majeure events or as needed to obtain any license, clearance or other authorization of any kind required to 
enter  into  and  restore  the  Premises  issued  by  any  Governmental  Authority  having  jurisdiction  over  the  use,  storage,  handling,  treatment, 
generation,  release,  disposal,  removal  or  remediation  of  Hazardous  Materials  (as  defined  in  Section  30)  in,  on  or  about  the  Premises 
(collectively referred to herein as “Hazardous Materials Clearances”); provided, however, that if repair or restoration of the Premises is not 
substantially complete as of the end of the Maximum Restoration Period or, if longer, the Restoration Period, Landlord may, in its sole and 
absolute  discretion,  elect  not  to  proceed  with  such  repair  and  restoration,  or  Tenant  may  by  written  notice  to  Landlord  delivered  within  5 
business  days  of  the  expiration  of  the  Maximum  Restoration  Period  or,  if  longer,  the  Restoration  Period,  elect  to  terminate  this  Lease,  in 
which event Landlord shall be relieved of its obligation to make such repairs or restoration and this Lease shall terminate as of the date that 
is 75 days after the later of:  (i) discovery of such damage or destruction, or (ii) the date all required Hazardous Materials Clearances are 
obtained, but Landlord shall retain any Rent paid and the right to any Rent payable by Tenant prior to such election by Landlord or Tenant.

Tenant,  at  its  expense,  shall  promptly  perform,  subject  to  delays  arising  from  the  collection  of  insurance  proceeds,  from  Force 
Majeure (as defined in Section 34) events or to obtain Hazardous Material Clearances, all repairs or restoration not required to be done by 
Landlord  and  shall  promptly  re-enter  the  Premises  and  commence  doing  business  in  accordance  with  this  Lease.    Notwithstanding  the 
foregoing, either Landlord or Tenant may terminate this Lease upon written notice to the other if the Premises are damaged during the last
year of the Term and Landlord reasonably estimates that it will take more than 2 months to repair such damage; provided, however, that such 
notice  is  delivered  within  10  business  days  after  the  date  that  Landlord  provides  Tenant  with  written  notice  of  the  estimated  Restoration 
Period.  

 
 
 
 
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Notwithstanding anything to the contrary contained herein, Landlord shall also have the right to terminate this Lease if insurance proceeds 
are not available for such restoration.  Rent shall be abated from the date all required Hazardous Material Clearances are obtained until the 
Premises are repaired and restored, in the proportion which the area of the Premises, if any, which is not usable by Tenant bears to the total 
area of the Premises, unless Landlord provides Tenant with other space during the period of repair that is suitable for the temporary conduct 
of  Tenant’s  business.    Such  abatement  shall  be  the  sole  remedy  of  Tenant,  and  except  as  otherwise  provided  in  this  Section  18,  Tenant 
waives any right to terminate the Lease by reason of damage or casualty loss.

The provisions of this Lease, including this Section 18, constitute an express agreement between Landlord and Tenant with respect 
to any and all damage to, or destruction of, all or any part of the Premises, or any other portion of the Project, and any statute or regulation 
which  is  now  or  may  hereafter  be  in  effect  shall  have  no  application  to  this  Lease  or  any  damage  or  destruction  to  all  or  any  part  of  the 
Premises or any other portion of the Project, the parties hereto expressly agreeing that this Section 18 sets forth their entire understanding 
and agreement with respect to such matters.

19. Condemnation.  If the whole or any material part of the Premises or the Project is taken for any public or quasi-public use under 
governmental law, ordinance, or regulation, or by right of eminent domain, or by private purchase in lieu thereof (a “Taking” or “Taken”), and 
the Taking would in Landlord’s reasonable judgment, materially interfere with or impair Landlord’s ownership or operation of the Project or 
would  in  the  reasonable  judgment  of  Landlord  and  Tenant  either  prevent  or  materially  interfere  with  Tenant’s  use  of  the  Premises  (as 
resolved, if the parties are unable to agree, by arbitration by a single arbitrator with the qualifications and experience appropriate to resolve 
the matter and appointed pursuant to and acting in accordance with the rules of the American Arbitration Association and using expedited 
procedures and timelines established by such single arbitrator), then upon written notice by Landlord or Tenant to the other this Lease shall 
terminate and Rent shall be apportioned as of the date of such termination.  Landlord and Tenant agree that a Taking of more than 50% of 
the Premises would constitute a material interference of Tenant’s use of the Premises.  If part of the Premises shall be Taken, and this Lease 
is not terminated as provided above, Landlord shall promptly restore the Premises and the Project as nearly as is commercially reasonable 
under the circumstances to their condition prior to such partial Taking and the rentable square footage of the Building, the rentable square 
footage of the Premises, Tenant’s Share of Operating Expenses and the Rent payable hereunder during the unexpired Term shall be reduced 
to  such  extent  as  may  be  fair  and  reasonable  under  the  circumstances.    Upon  any  such  Taking,  Landlord  shall  be  entitled  to  receive  the 
entire price or award from any such Taking without any payment to Tenant, and Tenant hereby assigns to Landlord Tenant’s interest, if any, in 
such award.  Tenant shall have the right, to the extent that same shall not diminish Landlord’s award, to make a separate claim against the 
condemning  authority  (but  not  Landlord)  for  such  compensation  as  may  be  separately  awarded  or  recoverable  by  Tenant  for  moving 
expenses and damage to Tenant’s trade fixtures, if a separate award for such items is made to Tenant.  Tenant hereby waives any and all 
rights  it  might  otherwise  have  pursuant  to  any  provision  of  state  law  to  terminate  this  Lease  upon  a  partial  Taking  of  the  Premises  or  the 
Project.

20. Events of Default.  Each of the following events shall be a default (“Default”) by Tenant under this Lease:

(a) Payment  Defaults.    Tenant  shall  fail  to  pay  any  installment  of  Rent  or  any  other  payment  hereunder  when  due;  provided, 
however, that Landlord will give Tenant notice and an opportunity to cure any failure to pay Rent within 5 days of any such notice not more 
than once in any 12 month period and Tenant agrees that such notice shall be in lieu of and not in addition to, or shall be deemed to be, any 
notice required by law.

(b) Insurance.  Any insurance required to be maintained by Tenant pursuant to this Lease shall be canceled or terminated or shall 
expire or shall be reduced or materially changed, or Landlord shall receive a notice of nonrenewal of any such insurance and Tenant shall fail 
to obtain replacement insurance before the expiration of the current coverage.

 
 
 
 
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(c) Abandonment.  Tenant shall abandon the Premises.  Tenant shall not be deemed to have abandoned the Premises if Tenant 
provides Landlord with reasonable advance notice prior to vacating and, at the time of vacating the Premises, (i) Tenant completes Tenant’s 
obligations under the Decommissioning and HazMat Closure Plan in compliance with Section 28, (ii) Tenant has obtained the release of the 
Premises of all Hazardous Materials Clearances and the Premises are free from any residual impact from the Tenant HazMat Operations and 
provides  reasonably  detailed  documentation  to  Landlord  confirming  such  matters,  (iii)  Tenant  has  made  reasonable  arrangements  with 
Landlord for the security of the Premises for the balance of the Term, and (iv) Tenant continues during the balance of the Term to satisfy and 
perform all of Tenant’s obligations under this Lease as they come due.

(d) Improper Transfer.    Tenant  shall  assign,  sublease  or  otherwise  transfer  or  attempt  to  transfer  all  or  any  portion  of  Tenant’s 
interest in this Lease or the Premises except as expressly permitted herein, or Tenant’s interest in this Lease shall be attached, executed 
upon, or otherwise judicially seized and such action is not released within 90 days of the action.

(e) Liens.    Tenant  shall  fail  to  discharge  (by  bond  other  otherwise)  or  otherwise  obtain  the  release  of  any  lien  placed  upon  the 

Premises in violation of this Lease within 10 days after Tenant receives notice that any such lien is filed against the Premises.

(f) Insolvency Events.  Tenant or any guarantor or surety of Tenant’s obligations hereunder shall:  (A) make a general assignment 
for the benefit of creditors; (B) commence any case, proceeding or other action seeking to have an order for relief entered on its behalf as a 
debtor or to adjudicate it a bankrupt or insolvent, or seeking reorganization, arrangement, adjustment, liquidation, dissolution or composition 
of it or its debts or seeking appointment of a receiver, trustee, custodian or other similar official for it or for all or of any substantial part of its 
property (collectively a “Proceeding for Relief”); (C) become the subject of any Proceeding for Relief which is not dismissed within 90 days 
of its filing or entry; or (D) die or suffer a legal disability (if Tenant, guarantor, or surety is an individual) or be dissolved or otherwise fail to 
maintain its legal existence (if Tenant, guarantor or surety is a corporation, partnership or other entity).

(g) Estoppel  Certificate  or  Subordination  Agreement.    Tenant  fails  to  execute  any  document  required  from  Tenant  under 

Sections 23 or 27 within 10 days after a second notice requesting such document.

(h) Other Defaults.    Tenant  shall  fail  to  comply  with  any  provision  of  this  Lease  other  than  those  specifically  referred  to  in  this 
Section 20, and, except as otherwise expressly provided herein, such failure shall continue for a period of 30 days after written notice thereof 
from Landlord to Tenant.

Any notice given under Section 20(h) hereof shall:  (i) specify the alleged default, (ii) demand that Tenant cure such default, (iii) be in lieu of, 
and  not  in  addition  to,  or  shall  be  deemed  to  be,  any  notice  required  under  any  provision  of  applicable  law,  and  (iv)  not  be  deemed  a 
forfeiture  or  a  termination  of  this  Lease  unless  Landlord  elects  otherwise  in  such  notice;  provided  that  if  the  nature  of  Tenant’s  default 
pursuant to Section 20(h) is such that it cannot be cured by the payment of money and reasonably requires more than 30 days to cure, then 
Tenant shall not be deemed to be in default if Tenant commences such cure within said 30 day period and thereafter diligently prosecutes the 
same to completion; provided, however, that such cure shall be completed no later than 45 days from the date of Landlord’s notice.

21. Landlord’s Remedies.

(a) Payment  By  Landlord;  Interest.    Upon  a  Default  by  Tenant  hereunder,  Landlord  may,  without  waiving  or  releasing  any 
obligation of Tenant hereunder, make such payment or perform such act.  All sums so paid or incurred by Landlord, together with interest 
thereon, from the date such sums were paid or incurred, at the annual rate equal to 12% per annum or the highest rate permitted by law (the 
“Default Rate”), whichever is less, shall be payable to Landlord on demand as additional Rent.  

 
 
 
 
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(b)

Late Payment Rent.  Late payment by Tenant to Landlord of Rent and other sums due will cause Landlord to incur 
costs  not  contemplated  by  this  Lease,  the  exact  amount  of  which  will  be  extremely  difficult  and  impracticable  to  ascertain.    Such  costs 
include, but are not limited to, processing and accounting charges and late charges which may be imposed on Landlord under any Mortgage 
covering the Premises.  Therefore, if any installment of Rent due from Tenant is not received by Landlord within 5 days after the date such 
payment is due, Tenant shall pay to Landlord an additional sum of 6% of the overdue Rent as a late charge.  Notwithstanding the foregoing, 
before assessing a late charge the first time in any calendar year, Landlord shall provide Tenant written notice of the delinquency and will 
waive  the  right  if  Tenant  pays  such  delinquency  within  5  days  thereafter.    The  parties  agree  that  this  late  charge  represents  a  fair  and 
reasonable estimate of the costs Landlord will incur by reason of late payment by Tenant.  In addition to the late charge, Rent not paid when 
due shall bear interest at the Default Rate from the 5th day after the date due until paid.

(c)

Remedies.  Upon the occurrence of a Default, Landlord, at its option, without further notice or demand to Tenant, 
shall have in addition to all other rights and remedies provided in this Lease, at law or in equity, the option to pursue any one or more of the 
following  remedies,  each  and  all  of  which  shall  be  cumulative  and  nonexclusive,  without  any  notice  or  demand  whatsoever  (except  as 
otherwise expressly provided in Section 21(c)(v) with respect to Landlord’s Lump Sum Election).  No cure in whole or in part of such Default 
by  Tenant  after  Landlord  has  taken  any  action  beyond  giving  Tenant  notice  of  such  Default  to  pursue  any  remedy  provided  for  herein 
(including retaining counsel to file an action or otherwise pursue any remedies) shall in any way affect Landlord’s right to pursue such remedy 
or any other remedy provided Landlord herein or under law or in equity, unless Landlord, in its sole discretion, elects to waive such Default.

(i)

This Lease and the Term and estate hereby granted are subject to the limitation that whenever a Default shall have 
happened and be continuing, Landlord shall have the right, at its election, then or thereafter while any such Default shall continue 
and  notwithstanding  the  fact  that  Landlord  may  have  some  other  remedy  hereunder  or  at  law  or  in  equity,  to  give  Tenant  written 
notice of Landlord’s intention to terminate this Lease on a date specified in such notice, which date shall be not less than 5 days 
after the giving of such notice, and upon the date so specified, this Lease and the estate hereby granted shall expire and terminate 
with  the  same  force  and  effect  as  if  the  date  specified  in  such  notice  were  the  date  hereinbefore  fixed  for  the  expiration  of  this 
Lease, and all rights of Tenant hereunder shall expire and terminate, and Tenant shall be liable as hereinafter in this Section 21(c) 
provided.  If any such notice is given, Landlord shall have, on such date so specified, the right of re-entry and possession of the 
Premises and the right to remove all persons and property therefrom and to store such property in a warehouse or elsewhere at the 
risk  and  expense,  and  for  the  account,  of  Tenant.    Should  Landlord  elect  to  re-enter  as  herein  provided  or  should  Landlord  take 
possession pursuant to legal proceedings or pursuant to any notice provided for by law, Landlord may, subject to Section 21(c)(ii) 
from time to time re-let the Premises or any part thereof for such term or terms and at such rental or rentals and upon such terms
and conditions as Landlord may deem advisable, with the right to make commercially reasonable alterations in and repairs to the 
Premises.

(ii)

Landlord  shall  be  deemed  to  have  satisfied  any  obligation  to  mitigate  its  damages  by  hiring  an  experienced 
commercial real estate broker to market the Premises and directing such broker to advertise and show the Premises to prospective 
tenants.

(iii)

In the event of any termination of this Lease as in this Section 21 provided or as required or permitted by law or in 
equity, Tenant shall forthwith quit and surrender the Premises to Landlord, and Landlord may, without further notice, enter upon, re-
enter, possess and repossess the same by summary proceedings, ejectment or otherwise, and again have, repossess and enjoy 
the same free of any rights of Tenant, and in any such event Tenant and no person claiming through or under Tenant by virtue of 
any law or an order of any court shall be entitled to possession or to remain in possession of the Premises.  

 
 
 
 
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(iv)

If this Lease is terminated or if Landlord shall re-enter the Premises as aforesaid, or in the event of the termination 
of this Lease, or of re-entry, by or under any proceeding or action or any provision of law by reason of a Default by Tenant, Tenant 
covenants and agrees forthwith to pay and be liable for, on the days originally fixed in this Lease for the payment thereof, amounts 
equal  to  the  installments  of  Base  Rent  and  all  Additional  Rent  as  they  would,  under  the  terms  of  this  Lease  become  due  if  this 
Lease had not been terminated or if Landlord had not entered or re-entered, as aforesaid, and whether the Premises be relet or 
remain vacant, in whole or in part, or for a period less than the remainder of the Term, or for the whole thereof, but in the event that 
the  Premises  be  relet  by  Landlord,  Tenant  shall  be  entitled  to  a  credit  in  the  net  amount  of  rent  and  other  charges  received  by 
Landlord in reletting, after deduction of all of Landlord’s expenses incurred in reletting the Premises (including, without limitation, 
tenant  improvement,  demising  and  remodeling  costs,  brokerage  fees  and  the  like),  and  in  collecting  the  rent  in  connection 
therewith,  in  the  following  manner:    Amounts  received  by  Landlord  after  reletting,  if  any,  shall  first  be  applied  against  such 
Landlord’s  expenses,  until  the  same  are  recovered,  and  until  such  recovery,  Tenant  shall  pay,  as  of  each  day  when  a  payment 
would fall due under this Lease, the amount which Tenant is obligated to pay under the terms of this Lease (Tenant’s liability prior to 
any such reletting and such recovery by Landlord no in any way to be diminished as a result of the fact that such reletting might be
for a rent higher than the rent provided for in this Lease); when and if such expenses have been completely recovered by Landlord, 
the amounts received from reletting by Landlord as have not previously been applied shall be credited against Tenant’s obligations 
as  of  each  day  when  a  payment  would  fall  due  under  this  Lease,  and  only  the  net  amount  thereof  shall  be  payable  by  Tenant.  
Further, Tenant shall not be entitled to any credit of any kind for any period after the date when the Term of this Lease is scheduled 
to expire according to its terms.

Actions, proceedings or suits for the recovery of damages, whether liquidated or other damages, under this Lease, or any 
installments thereof, may be brought by Landlord from time to time at its election, and nothing contained herein shall be deemed to 
require  Landlord  to  postpone  suit  until  the  date  when  the  Term  of  this  Lease  would  have  expired  if  it  had  not  been  terminated 
hereunder.

(v)

In addition, Landlord, at its election, notwithstanding any other provision of this Lease, by written notice to Tenant 
(the “Lump  Sum  Election”),  shall  be  entitled  to  recover  from  Tenant,  as  and  for  liquidated  damages,  at  any  time  following  any 
termination of this Lease, a lump sum payment representing, at the time of Landlord’s written notice of its Lump Sum Election, the 
sum of:

(A) the then present value (calculated in accordance with accepted financial practice using as the discount rate 
the  yield  to  maturity  on  United  States  Treasury  Notes  as  set  forth  below)  of  the  amount  of  unpaid  Base  Rent  and 
Additional Rent that would have been payable pursuant to this Lease for the remainder of the Term following Landlord’s 
Lump Sum Election if this Lease had not been terminated, and

(B) all other damages and expenses (including attorneys’ fees and expenses), if any, which Landlord shall have 

sustained by reason of the breach of any provision of this Lease; less 

(C) the then present value (calculated in accordance with accepted financial practice using as the discount rate 
the  yield  to  maturity  on  United  States  Treasury  Notes  as  set  forth  below)  of  the  aggregate  net  fair  market  rent  plus 
additional  charges  payable  for  the  Premises  (if  less  than  the  then  present  value  of  Base  Rent  and  Additional  Rent  that 
would have been payable pursuant to this Lease) for the remainder of the Term following Landlord’s Lump Sum Election, 
calculated  as  of  the  date  of  Landlord’s  Lump  Sum  Election,  and  taking  into  account  reasonable  estimates  of  the  future 
costs  to  relet  any  then  vacant  portions  of  the  Premises  (except  to  the  extent  that  Tenant  has  actually  paid  such  costs 
pursuant  to  this  Section  21)  in  order  to  calculate  the  net  rental  revenue  that  Landlord  may  expect  to  obtain  for  the 
Premises for the balance of the Term.  

 
 
 
 
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Landlord’s  recovery  under  its  Lump  Sum  Election  shall  be  in  addition  to  Tenant’s  obligations  to  pay  Base  Rent  and 
Additional  Rent  due  and  costs  incurred  prior  to  the  date  of  Landlord’s  Lump  Sum  Election,  and  in  lieu  of  any  Base  Rent  and 
Additional Rent which would otherwise have been due under this Section from and after the date of Landlord’s Lump Sum Election.  
The yield to maturity on United States Treasury Notes having a maturity date that is nearest the date that would have been the last 
day of the Term of this Lease, as reported in the Wall Street Journal or a comparable publication if it ceases to publish such yields, 
shall  be  used  in  calculating  present  values  for  purposes  of  Landlord’s  Lump  Sum  Election.    For  the  purposes  of  this  Section,  if 
Landlord makes the Lump Sum Election to recover liquidated damages in accordance with this Section, the total Additional Rent 
shall be computed based upon Landlord’s reasonable estimate of Tenant’s Share of Operating Expenses and other Additional Rent 
for each 12-month period in what would have been the remainder of the Term of this Lease and any part thereof at the end of such 
remainder of the Term, but in no event less than the amounts therefor payable for the twelve (12) calendar months (or if less than 
twelve  (12)  calendar  months  have  elapsed  since  the  date  hereof,  the  partial  year)  immediately  preceding  the  date  of  Landlord’s 
Lump Sum Election.  Amounts of Tenant’s Share of Operating Expenses and any other Additional Rent for any partial year at the 
beginning of the Term or at the end of what would have been the remainder of the Term shall be prorated.

(vi)

Nothing herein contained shall limit or prejudice the right of Landlord, in any bankruptcy or insolvency proceeding, 
to  prove  for  and  obtain  as  liquidated  damages  by  reason  of  such  termination  an  amount  equal  to  the  maximum  allowed  by  any 
bankruptcy or insolvency proceedings, or to prove for and obtain as liquidated damages by reason of such termination, an amount 
equal to the maximum allowed by any statute or rule of law, whether such amount shall be greater or less than the excess referred 
to above.

(vii) Nothing  in  this  Section 21  shall  be  deemed  to  affect  the  right  of  either  party  to  indemnifications  pursuant  to  this 

Lease.

(viii)

If Landlord terminates this Lease upon the occurrence of a Default, Tenant will quit and surrender the Premises to 
Landlord  or  its  agents,  and  Landlord  may,  without  further  notice,  enter  upon,  re-enter  and  repossess  the  Premises  by  summary 
proceedings,  ejectment  or  otherwise.    The  words  “enter”,  “re-enter”,  and  “re-entry”  are  not  restricted  to  their  technical  legal 
meanings.

(ix)

If  either  party  shall  be  in  default  in  the  observance  or  performance  of  any  provision  of  this  Lease,  and  an  action 
shall be brought for the enforcement thereof in which it shall be determined that such party was in default, the party in default shall 
pay to the other party all reasonable, out of pocket fees, costs and other expenses which may become payable as a result thereof 
or in connection therewith, including reasonable attorneys’ fees and expenses.

(x)

If  a  Default  by  Tenant  shall  occur  in  the  keeping,  observance  or  performance  of  any  covenant,  agreement,  term, 
provision or condition herein contained, Landlord, without thereby waiving such Default, may perform the same for the account and 
at the expense of Tenant (a) immediately or at any time thereafter and with only such notice, if any, as may be practicable under the 
circumstances in the case of an emergency or in case such Default will result in a violation of any legal or insurance requirements, 
or in the imposition of any lien against all or any portion of the Premises or the Project not discharged, released or bonded over to 
Landlord’s satisfaction by Tenant within the time period required pursuant to Section 15 of this Lease, and (b) in any other case if 
such  Default  continues  after  any  applicable  notice  and  cure  period  provided  in  Section 20.    All  reasonable  costs  and  expenses 
incurred  by  Landlord  in  connection  with  any  such  performance  by  it  for  the  account  of  Tenant  and  also  all  reasonable  costs  and 
expenses, including attorneys’ fees and disbursements incurred by Landlord in any action or proceeding (including any summary 
dispossess proceeding) brought by Landlord to enforce any obligation of Tenant under this Lease and/or right of Landlord in or to 
the Premises, shall be paid by Tenant to Landlord within 10 days after demand.

 
 
 
 
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(xi)

Independent  of  the  exercise  of  any  other  remedy  of  Landlord  hereunder  or  under  applicable  law,  Landlord  may 

conduct an environmental test of the Premises as generally described in Section 30(d).

(xii)

In  the  event  that  Tenant  is  in  breach  or  Default  under  this  Lease,  whether  or  not  Landlord  exercises  its  right  to 
terminate  or  any  other  remedy,  Tenant  shall  reimburse  Landlord  upon  demand  for  any  out  of  pocket  costs  and  expenses  that 
Landlord may incur in connection with any such breach or Default, as provided in this Section 21(c).  Such costs shall include legal 
fees and costs incurred for the negotiation of a settlement, enforcement of rights or otherwise.  Tenant shall also indemnify Landlord 
against and hold Landlord harmless from all costs, expenses, demands and liability, including without limitation, legal fees and costs 
Landlord shall incur if Landlord shall become or be made a party to any claim or action instituted by Tenant against any third party, 
by  any  third  party  against  Tenant  or  by  or  against  any  person  holding  any  interest  under  or  using  the  Premises  by  license  of  or 
agreement with Tenant.

Except as otherwise provided in this Section 21, no right or remedy herein conferred upon or reserved to Landlord is intended to be 
exclusive  of  any  other  right  or  remedy,  and  every  right  and  remedy  shall  be  cumulative  and  in  addition  to  any  other  legal  or 
equitable right or remedy given hereunder, or now or hereafter existing.  No waiver by Landlord of any provision of this Lease shall 
be deemed to have been made unless expressly so made in writing by Landlord expressly waiving such provision.  Landlord shall 
be entitled, to the extent permitted by law, to seek injunctive relief in case of the violation, or attempted or threatened violation, of 
any provision of this Lease, or to seek a decree compelling observance or performance of any provision of this Lease, or to seek 
any other legal or equitable remedy.

22. Assignment and Subletting.

(a) General Prohibition.    Without  Landlord’s  prior  written  consent  subject  to  and  on  the  conditions  described  in  this  Section  22, 
Tenant shall not, directly or indirectly, voluntarily or by operation of law, assign this Lease or sublease the Premises or any part thereof or 
mortgage, pledge, or hypothecate its leasehold interest or grant any concession or license within the Premises, and any attempt to do any of 
the foregoing shall be void and of no effect.  If Tenant is a corporation, partnership or limited liability company, the shares or other ownership 
interests  thereof  which  are  not  actively  traded  upon  a  stock  exchange  or  in  the  over-the-counter  market,  a  transfer  or  series  of  transfers 
whereby  50%  or  more  of  the  issued  and  outstanding  shares  or  other  ownership  interests  of  such  corporation  are,  or  voting  control  is, 
transferred  (but  excepting  transfers  upon  deaths  of  individual  owners)  from  a  person  or  persons  or  entity  or  entities  which  were  owners 
thereof  at  time  of  execution  of  this  Lease  to  persons  or  entities  who  were  not  owners  of  shares  or  other  ownership  interests  of  the 
corporation, partnership or limited liability company at time of execution of this Lease, shall be deemed an assignment of this Lease requiring 
the consent of Landlord as provided in this Section 22.  

(b) Permitted  Transfers.    If  Tenant  desires  to  assign,  sublease,  hypothecate  or  otherwise  transfer  this  Lease  or  sublet  the 
Premises other than pursuant to a Permitted Assignment (as defined below), then at least 15 business days, but not more than 45 business 
days,  before  the  date  Tenant  desires  the  assignment  or  sublease  to  be  effective  (the  “Assignment Date”),  Tenant  shall  give  Landlord  a 
notice (the “Assignment Notice”) containing such information about the proposed assignee or sublessee, including the proposed use of the 
Premises  and  any  Hazardous  Materials  proposed  to  be  used,  stored  handled,  treated,  generated  in  or  released  or  disposed  of  from  the 
Premises,  the  Assignment  Date,  any  relationship  between  Tenant  and  the  proposed  assignee  or  sublessee,  and  all  material  terms  and 
conditions  of  the  proposed  assignment  or  sublease,  including  a  copy  of  any  proposed  assignment  or  sublease  in  its  final  form,  and  such 
other  information  as  Landlord  may  deem  reasonably  necessary  or  appropriate  to  its  consideration  whether  to  grant  its  consent.    Landlord 
may, by giving written notice to Tenant within 15 business days after receipt of the Assignment Notice:  (i) grant such consent (provided that 
Landlord shall further have the right to review and approve or disapprove the proposed form of sublease prior to the effective date of any 
such subletting), (ii) refuse such consent, in its reasonable discretion; or (iii) terminate this Lease with respect to the space described in the 
Assignment Notice as of the Assignment Date (an 

 
 
 
 
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“Assignment Termination”).  Among other reasons, it shall be reasonable for Landlord to withhold its consent in any of these instances:  (1) 
the  proposed  assignee  or  subtenant  is  a  governmental  agency;  (2)  in  Landlord’s  reasonable  judgment,  the  use  of  the  Premises  by  the 
proposed assignee or subtenant would entail any alterations that would lessen the value of the leasehold improvements in the Premises, or 
would  require  increased  services  by  Landlord;  (3)  in  Landlord’s  reasonable  judgment,  the  proposed  assignee  or  subtenant  is  engaged  in 
areas of scientific research or other business concerns that are controversial; (4) in Landlord’s reasonable judgment, the proposed assignee 
or  subtenant  lacks  the  creditworthiness  to  support  the  financial  obligations  it  will  incur  under  the  proposed  assignment  or  sublease;  (5)  in 
Landlord’s reasonable judgment, the character, reputation, or business of the proposed assignee or subtenant is inconsistent with the desired 
tenant-mix or the quality of other tenancies in the Project or is inconsistent with the type and quality of the nature of the Building; (6) Landlord 
has received from any prior landlord to the proposed assignee or subtenant a negative report concerning such prior landlord’s experience 
with the proposed assignee or subtenant; (7) Landlord has experienced previous defaults by or is in litigation with the proposed assignee or 
subtenant;  (8)  the  use  of  the  Premises  by  the  proposed  assignee  or  subtenant  will  violate  any  applicable  Legal  Requirement;  (9)  the 
proposed  assignee  or  subtenant,  or  any  entity  that,  directly  or  indirectly,  controls,  is  controlled  by,  or  is  under  common  control  with  the 
proposed  assignee  or  subtenant,  is  then  an  occupant  of  the  Project;  (10)  the  proposed  assignee  or  subtenant  is  an  entity  with  whom 
Landlord  is  negotiating  to  lease  space  in  the  Project;  or  (11)  the  assignment  or  sublease  is  prohibited  by  Landlord’s  lender.    If  Landlord 
delivers  notice  of  its  election  to  exercise  an  Assignment  Termination,  Tenant  shall  have  the  right  to  withdraw  such  Assignment  Notice  by 
written notice to Landlord of such election within 5 business days after Landlord’s notice electing to exercise the Assignment Termination.  If 
Tenant withdraws such Assignment Notice, this Lease shall continue in full force and effect.  If Tenant does not withdraw such Assignment 
Notice, this Lease, and the term and estate herein granted, shall terminate as of the Assignment Date with respect to the space described in 
such Assignment Notice.  No failure of Landlord to exercise any such option to terminate this Lease, or to deliver a timely notice in response 
to the Assignment Notice, shall be deemed to be Landlord’s consent to the proposed assignment, sublease or other transfer.  Tenant shall 
pay to Landlord a fee equal to Two Thousand Five Hundred Dollars ($2,500) in connection with its consideration of any Assignment Notice 
and/or  its  preparation  or  review  of  any  consent  documents.    Notwithstanding  the  foregoing,  Landlord’s  consent  to  an  assignment  of  this 
Lease or a subletting of any portion of the Premises to any entity controlling, controlled by or under common control with Tenant (a “Control 
Permitted Assignment”)  shall  not  be  required,  provided  that  Landlord  shall  have  the  right  to  approve  the  form  of  any  such  sublease  or 
assignment.  In addition, Tenant shall have the right to assign this Lease, upon 10 days prior written notice to Landlord but without obtaining 
Landlord’s prior written consent, to a corporation or other entity which is a successor-in-interest to Tenant, by way of merger, consolidation or 
corporate reorganization, or by the purchase of all or substantially all of the assets or the ownership interests of Tenant provided that (i) such 
merger or consolidation, or such acquisition or assumption, as the case may be, is for a good business purpose and not principally for the
purpose  of  transferring  this  Lease,  and  (ii)  the  net  worth  (as  determined  in  accordance  with  generally  accepted  accounting  principles 
(“GAAP”))  of  the  assignee  is  not  less  than  the  greater  of  the  net  worth  (as  determined  in  accordance  with  GAAP)  of  Tenant  as  of  (A)  the 
Commencement Date, or (B) as of the date of Tenant’s most current quarterly or annual financial statements, and (iii) such assignee shall 
agree  in  writing  to  assume  all  of  the  terms,  covenants  and  conditions  of  this  Lease  (a  “Corporate  Permitted  Assignment”).    Control 
Permitted Assignments and Corporate Permitted Assignments are hereinafter referred to as “Permitted Assignments.”

(c) Additional Conditions.    As  a  condition  to  any  such  assignment  or  subletting,  whether  or  not  Landlord’s  consent  is  required, 

Landlord may require:

(i)

that any assignee or subtenant agree, in writing at the time of such assignment or subletting, that if Landlord gives 
such party notice that Tenant is in default under this Lease, such party shall thereafter make all payments otherwise due Tenant 
directly to Landlord, which payments will be received by Landlord without any liability except to credit such payment against those 
due under this Lease, and any such third party shall agree to attorn to Landlord or its successors and assigns should this Lease be 
terminated for any reason; provided, however, in no event shall Landlord or its successors or assigns be obligated to accept such 
attornment; and

 
 
 
 
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(ii)

A  list  of  Hazardous  Materials,  certified  by  the  proposed  assignee  or  sublessee  to  be  true  and  correct,  which  the 
proposed  assignee  or  sublessee  intends  to  use,  store,  handle,  treat,  generate  in  or  release  or  dispose  of  from  the  Premises, 
together  with  copies  of  all  documents  relating  to  such  use,  storage,  handling,  treatment,  generation,  release  or  disposal  of 
Hazardous Materials by the proposed assignee or subtenant in the Premises or on the Project, prior to the proposed assignment or 
subletting,  including,  without  limitation:    permits;  approvals;  reports  and  correspondence;  storage  and  management  plans;  plans 
relating to the installation of any storage tanks to be installed in or under the Project (provided, said installation of tanks shall only 
be permitted after Landlord has given its written consent to do so, which consent may be withheld in Landlord’s sole and absolute 
discretion); and all closure plans or any other documents required by any and all federal, state and local Governmental Authorities 
for any storage tanks installed in, on or under the Project for the closure of any such tanks.  Neither Tenant nor any such proposed 
assignee or subtenant is required, however, to provide Landlord with any portion(s) of the such documents containing information of 
a proprietary nature which, in and of themselves, do not contain a reference to any Hazardous Materials or hazardous activities.

(d) No Release of Tenant, Sharing of Excess Rents.  Notwithstanding any assignment or subletting, Tenant and any guarantor or 
surety of Tenant’s obligations under this Lease shall at all times remain fully and primarily responsible and liable for the payment of Rent and 
for  compliance  with  all  of  Tenant’s  other  obligations  under  this  Lease.    If  the  rent  due  and  payable  by  a  sublessee  or  assignee  (or  a 
combination of the rental payable under such sublease or assignment plus any bonus or other consideration therefor or incident thereto in 
any form) exceeds the sum of the rental payable under this Lease with respect to the applicable portion of the Premises (excluding however, 
any  Rent  payable  under  this  Section)  and  actual  and  reasonable  brokerage  fees,  legal  costs  and  any  design  or  construction  fees  directly 
related  to  and  required  pursuant  to  the  terms  of  any  such  sublease  (“Excess  Rent”),  then  Tenant  shall  be  bound  and  obligated  to  pay 
Landlord as Additional Rent hereunder 50% of such Excess Rent within 10 days following receipt thereof by Tenant.  If Tenant shall sublet 
the Premises or any part thereof, Tenant hereby immediately and irrevocably assigns to Landlord, as security for Tenant’s obligations under 
this Lease, all rent from any such subletting, and Landlord as assignee and as attorney-in-fact for Tenant, or a receiver for Tenant appointed 
on Landlord’s application, may collect such rent and apply it toward Tenant’s obligations under this Lease; except that, until the occurrence of 
a Default, Tenant shall have the right to collect such rent.

(e) No Waiver.  The consent by Landlord to an assignment or subletting shall not relieve Tenant or any assignees of this Lease or 
any sublessees of the Premises from obtaining the consent of Landlord to any further assignment or subletting nor shall it release Tenant or 
any assignee or sublessee of Tenant from full and primary liability under this Lease.  The acceptance of Rent hereunder, or the acceptance of
performance of any other term, covenant, or condition thereof, from any other person or entity shall not be deemed to be a waiver of any of 
the provisions of this Lease or a consent to any subletting, assignment or other transfer of the Premises.

(f) Prior Conduct of Proposed Transferee.  Notwithstanding any other provision of this Section 22, if (i) the proposed assignee or 
sublessee of Tenant has been required by any prior landlord, lender or Governmental Authority to take remedial action in connection with 
Hazardous Materials contaminating a property, where the contamination resulted from such party’s action or use of the property in question, 
(ii) the proposed assignee or sublessee is subject to an enforcement order issued by any Governmental Authority in connection with the use, 
storage,  handling,  treatment,  generation,  release  or  disposal  of  Hazardous  Materials  (including,  without  limitation,  any  order  related  to  the 
failure to make a required reporting to any Governmental Authority), or (iii) because of the existence of a pre-existing environmental condition 
in the vicinity of or underlying the Project, the risk that Landlord would be targeted as a responsible party in connection with the remediation 
of such pre-existing environmental condition would be materially increased or exacerbated by the proposed use of Hazardous Materials by 
such  proposed  assignee  or  sublessee,  Landlord  shall  have  the  absolute  right  to  refuse  to  consent  to  any  assignment  or  subletting  to  any 
such party. 

 
 
 
 
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23. Estoppel Certificate.  Tenant shall, within 10 business days of written notice from Landlord, execute, acknowledge and deliver 
a statement in writing in any form reasonably requested by a proposed lender or purchaser, (i) certifying that this Lease is unmodified and in 
full force and effect (or, if modified, stating the nature of such modification and certifying that this Lease as so modified is in full force and 
effect)  and  the  dates  to  which  the  rental  and  other  charges  are  paid  in  advance,  if  any,  (ii)  acknowledging  that  there  are  not  any  uncured 
defaults on the part of Landlord hereunder, or specifying such defaults if any are claimed, and (iii) setting forth such further information with 
respect  to  the  status  of  this  Lease  or  the  Premises  as  may  be  requested  thereon.    Any  such  statement  may  be  relied  upon  by  any 
prospective purchaser or encumbrancer of all or any portion of the real property of which the Premises are a part.  Tenant’s failure to deliver 
such statement within 5 days after Tenant’s receipt of a second written notice from Landlord (such second written notice not to be delivered 
prior to 10 business days after the date of the initial notice) shall, at the option of Landlord, constitute a Default under this Lease, and, in any 
event, shall be conclusive upon Tenant that this Lease is in full force and effect and without modification except as may be represented by 
Landlord in any certificate prepared by Landlord and delivered to Tenant for execution.  

24. Quiet Enjoyment.  So long as Tenant is not in Default under this Lease, Tenant shall, subject to the terms of this Lease, at all 

times during the Term, have peaceful and quiet enjoyment of the Premises against any person claiming by, through or under Landlord.

25. Prorations.  All prorations required or permitted to be made hereunder shall be made on the basis of a 360 day year and 30 day 

months.

26. Rules and Regulations.  Tenant shall, at all times during the Term and any extension thereof, comply with all reasonable rules 
and  regulations  at  any  time  or  from  time  to  time  established  by  Landlord  covering  use  of  the  Premises  and  the  Project.    Such  rules  and 
regulations may include, without limitation, rules and regulations relating to the use of the Project Amenities and/or rules and regulations with 
respect  to  the  Common  Areas  of  the  Project  which  are  intended  to  encourage  social  distancing,  promote  and  protect  health  and  physical 
well-being at the Project and/or intended to limit the spread of communicable diseases and/or viruses of any kind or nature that are more 
virulent than the seasonal flu (collectively, “Infectious Conditions”).  The current rules and regulations are attached hereto as Exhibit E.  If 
there  is  any  conflict  between  said  rules  and  regulations  and  other  provisions  of  this  Lease,  the  terms  and  provisions  of  this  Lease  shall 
control.  Landlord shall not have any liability or obligation for the breach of any rules or regulations by other tenants in the Project and shall 
not enforce such rules and regulations in a discriminatory manner.

27. Subordination.  This Lease and Tenant’s interest and rights hereunder are hereby made and shall be subject and subordinate 
at all times to the lien of any Mortgage now existing or hereafter created on or against the Project or the Premises, and all amendments, 
restatements, renewals, modifications, consolidations, refinancing, assignments and extensions thereof, without the necessity of any further 
instrument or act on the part of Tenant; provided, however that so long as there is no Default hereunder, Tenant’s right to possession of the 
Premises shall not be disturbed by the Holder of any such Mortgage.  Tenant agrees, at the election of the Holder of any such Mortgage, to 
attorn  to  any  such  Holder.    Tenant  agrees  upon  demand  to  execute,  acknowledge  and  deliver  such  instruments,  confirming  such 
subordination,  and  such  instruments  of  attornment  as  shall  be  requested  by  any  such  Holder,  provided  any  such  instruments  contain 
appropriate non-disturbance provisions assuring Tenant’s quiet enjoyment of the Premises as set forth in Section 24 hereof.  Notwithstanding 
the  foregoing,  any  such  Holder  may  at  any  time  subordinate  its  Mortgage  to  this  Lease,  without  Tenant’s  consent,  by  notice  in  writing  to 
Tenant, and thereupon this Lease shall be deemed prior to such Mortgage without regard to their respective dates of execution, delivery or 
recording and in that event such Holder shall have the same rights with respect to this Lease as though this Lease had been executed prior 
to the execution, delivery and recording of such Mortgage and had been assigned to such Holder.  The term “Mortgage” whenever used in 
this Lease shall be deemed to include deeds of trust, security assignments and any other encumbrances, and any reference to the “Holder” 
of a Mortgage shall be deemed to include the beneficiary under a deed of trust.

 
 
 
 
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28. Surrender.  Upon the expiration of the Term or earlier termination of Tenant’s right of possession, Tenant shall surrender the 
Premises to Landlord in the same condition in the condition following the substantial completion of the Premises Improvements, subject to 
any  Alterations  or  Installations  permitted  by  Landlord  to  remain  in  the  Premises,  free  of  Hazardous  Materials  brought  upon,  kept,  used, 
stored, handled, treated, generated in, or released or disposed of from, the Premises by any person other than Landlord or any Landlord’s 
employees, agents and contractors (collectively, “Tenant HazMat Operations”) and released of all Hazardous Materials Clearances, broom 
clean, ordinary wear and tear and casualty loss and condemnation covered by Sections 18 and 19 excepted.  At least 3 months prior to the 
surrender of the Premises or such earlier date as Tenant may elect to cease operations at the Premises, Tenant shall deliver to Landlord a 
narrative description of the actions proposed (or required by any Governmental Authority) to be taken by Tenant in order to surrender the 
Premises (including any Installations permitted by Landlord to remain in the Premises) at the expiration or earlier termination of the Term, 
free  from  any  residual  impact  from  the  Tenant  HazMat  Operations  and  otherwise  released  for  unrestricted  use  and  occupancy  (the 
“Decommissioning and HazMat  Closure  Plan”).    Such  Decommissioning  and  HazMat  Closure  Plan  shall  be  accompanied  by  a  current 
listing of (i) all Hazardous Materials licenses and permits held by or on behalf of any Tenant Party with respect to the Premises, and (ii) all 
Hazardous  Materials  used,  stored,  handled,  treated,  generated,  released  or  disposed  of  from  the  Premises,  and  shall  be  subject  to  the 
review  and  approval  of  Landlord’s  environmental  consultant.    In  connection  with  the  review  and  approval  of  the  Decommissioning  and 
HazMat  Closure  Plan,  upon  the  request  of  Landlord,  Tenant  shall  deliver  to  Landlord  or  its  consultant  such  additional  non-proprietary 
information concerning Tenant HazMat Operations as Landlord shall request.  On or before such surrender, Tenant shall deliver to Landlord 
evidence that the approved Decommissioning and HazMat Closure Plan shall have been satisfactorily completed and Landlord shall have the
right, subject to reimbursement at Tenant’s expense as set forth below, to cause Landlord’s environmental consultant to inspect the Premises 
and perform such additional procedures as may be deemed reasonably necessary to confirm that the Premises are, as of the effective date 
of such surrender or early termination of this Lease, free from any residual impact from Tenant HazMat Operations.  Tenant shall reimburse 
Landlord, as Additional Rent, for the actual out-of-pocket expense incurred by Landlord for Landlord’s environmental consultant to review and 
approve the Decommissioning and HazMat Closure Plan and to visit the Premises and verify satisfactory completion of the same, which cost 
shall  not  exceed  $5,000.    Landlord  shall  have  the  unrestricted  right  to  deliver  such  Decommissioning  and  HazMat  Closure  Plan  and  any 
report by Landlord’s environmental consultant with respect to the surrender of the Premises to third parties. 

If Tenant shall fail to prepare or submit a Decommissioning and HazMat Closure Plan approved by Landlord, or if Tenant shall fail to 
complete the approved Decommissioning and HazMat Closure Plan, or if such Decommissioning and HazMat Closure Plan, whether or not 
approved  by  Landlord,  shall  fail  to  adequately  address  any  residual  effect  of  Tenant  HazMat  Operations  in,  on  or  about  the  Premises, 
Landlord  shall  have  the  right  to  take  such  actions  as  Landlord  may  deem  reasonable  or  appropriate  to  assure  that  the  Premises  and  the 
Project  are  surrendered  free  from  any  residual  impact  from  Tenant  HazMat  Operations,  the  cost  of  which  actions  shall  be  reimbursed  by 
Tenant as Additional Rent, without regard to the limitation set forth in the first paragraph of this Section 28.

Tenant shall immediately return to Landlord all keys and/or access cards to parking, the Project, restrooms or all or any portion of the 
Premises furnished to or otherwise procured by Tenant.  If any such access card or key is lost, Tenant shall pay to Landlord, at Landlord’s 
election, either the reasonable cost of replacing such lost access card or key or the reasonable cost of reprogramming the access security 
system in which such access card was used or changing the lock or locks opened by such lost key.  Any Tenant’s Property, Alterations and 
property not so removed by Tenant as permitted or required herein shall be deemed abandoned and may be stored, removed, and disposed 
of  by  Landlord  at  Tenant’s  expense,  and  Tenant  waives  all  claims  against  Landlord  for  any  damages  resulting  from  Landlord’s  retention
and/or disposition of such property.  All obligations of Tenant hereunder not fully performed as of the termination of the Term, including the 
obligations  of  Tenant  under  Section 30  hereof,  shall  survive  the  expiration  or  earlier  termination  of  the  Term,  including,  without  limitation, 
indemnity obligations, payment obligations with respect to Rent and obligations concerning the condition and repair of the Premises.

 
 
 
 
 
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29. Waiver of Jury Trial.  TO THE EXTENT PERMITTED BY LAW, TENANT AND LANDLORD WAIVE ANY RIGHT TO TRIAL BY 
JURY  OR  TO  HAVE  A  JURY  PARTICIPATE  IN  RESOLVING  ANY  DISPUTE,  WHETHER  SOUNDING  IN  CONTRACT,  TORT,  OR 
OTHERWISE, BETWEEN LANDLORD AND TENANT ARISING OUT OF THIS LEASE OR ANY OTHER INSTRUMENT, DOCUMENT, OR 
AGREEMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH OR THE TRANSACTIONS RELATED HERETO.

30. Environmental Requirements.

(a) Prohibition/Compliance/Indemnity.  Tenant shall not cause or permit any Hazardous Materials (as hereinafter defined) to be 
brought upon, kept, used, stored, handled, treated, generated in or about, or released or disposed of from, the Premises, Building or Project 
in  violation  of  applicable  Environmental  Requirements  (as  hereinafter  defined)  by  Tenant  or  any  Tenant  Party.    If  Tenant  breaches  the 
obligation stated in the preceding sentence, or if the presence of Hazardous Materials in the Premises during the Term, any holding over or 
any other period during which Tenant occupied the Premises results in contamination of the Premises, Building or Project or any adjacent 
property or if contamination of the Premises, Building or Project or any adjacent property by Hazardous Materials brought into, kept, used, 
stored, handled, treated, generated in or about, or released or disposed of from, the Premises by anyone other than Landlord and Landlord’s 
employees, agents and contractors otherwise occurs during the Term, any holding over any holding over or any other period during which 
Tenant occupied the Premises, Tenant hereby indemnifies and shall defend and hold Landlord, its officers, directors, employees, agents and 
contractors  harmless  from  any  and  all  actions  (including,  without  limitation,  remedial  or  enforcement  actions  of  any  kind,  administrative  or 
judicial  proceedings,  and  orders  or  judgments  arising  out  of  or  resulting  therefrom),  costs,  claims,  damages  (including,  without  limitation, 
punitive damages and damages based upon diminution in value of the Premises or the Project, or the loss of, or restriction on, use of the 
Premises  or  any  portion  of  the  Project),  expenses  (including,  without  limitation,  attorneys’,  consultants’  and  experts’  fees,  court  costs  and 
amounts paid in settlement of any claims or actions), fines, forfeitures or other civil, administrative or criminal penalties, injunctive or other 
relief  (whether  or  not  based  upon  personal  injury,  property  damage,  or  contamination  of,  or  adverse  effects  upon,  the  environment,  water 
tables or natural resources), liabilities or losses which arise during or after the Term as a result of such contamination or breach by Tenant of 
its obligations under this Section 30.  This indemnification of Landlord by Tenant includes, without limitation, costs incurred in connection with 
any related investigation of site conditions or any cleanup, treatment, remedial, removal, or restoration work required by any federal, state or 
local  Governmental  Authority  because  of  Hazardous  Materials  present  in  the  air,  soil  or  ground  water  above,  on,  or  under  the  Premises.  
Without limiting the foregoing, if the presence of any Hazardous Materials on the Premises, the Building, Project or any adjacent property 
caused or permitted by Tenant or any Tenant Party results in any contamination of the Premises, Building, Project or any adjacent property, 
Tenant shall promptly take all actions at its sole expense and in accordance with applicable Environmental Requirements as are necessary to 
return the Premises, Building, Project or any adjacent property to the condition existing prior to the time of such contamination, provided that 
Landlord’s approval of such action shall first be obtained, which approval shall not unreasonably be withheld, conditioned or delayed so long 
as  such  actions  would  not  potentially  have  any  material  adverse  long-term  or  short-term  effect  on  the  Premises,  Building  or  the  Project.  
Notwithstanding anything to the contrary contained in this Section 30, Tenant shall not be responsible for, and the indemnification and hold 
harmless  obligation  set  forth  in  this  paragraph  shall  not  apply  to,  (i)  contamination  in  the  Premises  which  Tenant  can  prove  to  Landlord’s 
reasonable satisfaction existed in the Premises prior to Tenant’s occupancy of the Premises, or (ii) the presence of any Hazardous Materials 
in  the  Premises  which  Tenant  can  prove  to  Landlord’s  reasonable  satisfaction  migrated  from  outside  of  the  Premises  into  the  Premises, 
unless in either case, the presence of such Hazardous Materials (x) is the result of a breach by Tenant of any of its obligations under this 
Lease, or (y) was caused, contributed to or exacerbated by Tenant or any Tenant Party.

(b) Business.  Landlord acknowledges that it is not the intent of this Section 30 to prohibit Tenant from using the Premises for the 
Permitted  Use.    Tenant  may  operate  its  business  according  to  prudent  industry  practices  so  long  as  the  use  or  presence  of  Hazardous 
Materials  is  strictly  and  properly  monitored  according  to  all  then  applicable  Environmental  Requirements.    As  a  material  inducement  to 
Landlord to allow Tenant to use Hazardous Materials in connection with its business, Tenant agrees to 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 27

deliver  to  Landlord  prior  to  the  Commencement  Date  a  list  identifying  each  type  of  Hazardous  Materials  to  be  brought  upon,  kept,  used, 
stored, handled, treated, generated on, or released or disposed of from, the Premises and setting forth any and all governmental approvals 
or permits required in connection with the presence, use, storage, handling, treatment, generation, release or disposal of such Hazardous 
Materials on or from the Premises (“Hazardous Materials List”).  Upon Landlord’s request, or any time that Tenant is required to deliver a 
Hazardous  Materials  List  to  any  Governmental  Authority  (e.g.,  the  fire  department)  in  connection  with  Tenant’s  use  or  occupancy  of  the 
Premises, Tenant shall deliver to Landlord a copy of such Hazardous Materials List.  Tenant shall deliver to Landlord true and correct copies 
of the following documents (the “Haz Mat Documents”) relating to the use, storage, handling, treatment, generation, release or disposal of 
Hazardous  Materials  prior  to  the  Commencement  Date,  or  if  unavailable  at  that  time,  concurrent  with  the  receipt  from  or  submission  to  a 
Governmental Authority:  permits; approvals; reports and correspondence; storage and management plans, notice of violations of any Legal 
Requirements; plans relating to the installation of any storage tanks to be installed in or under the Project (provided, said installation of tanks 
shall only be permitted after Landlord has given Tenant its written consent to do so, which consent may be withheld in Landlord’s sole and 
absolute discretion); all closure plans or any other documents required by any and all federal, state and local Governmental Authorities for 
any storage tanks installed in, on or under the Project for the closure of any such tanks; and a Decommissioning and HazMat Closure Plan 
(to the extent surrender in accordance with Section 28 cannot be accomplished in 3 months).  Tenant is not required, however, to provide 
Landlord with any portion(s) of the Haz Mat Documents containing information of a proprietary nature which, in and of themselves, do not 
contain a reference to any Hazardous Materials or hazardous activities.  It is not the intent of this Section to provide Landlord with information 
which could be detrimental to Tenant’s business should such information become possessed by Tenant’s competitors.

(c) Tenant Representation and Warranty.  Tenant hereby represents and warrants to Landlord that (i) neither Tenant nor any of its 
legal  predecessors  has  been  required  by  any  prior  landlord,  lender  or  Governmental  Authority  at  any  time  to  take  remedial  action  in 
connection with Hazardous Materials contaminating a property which contamination was permitted by Tenant of such predecessor or resulted 
from Tenant’s or such predecessor’s action or use of the property in question, and (ii) Tenant is not subject to any enforcement order issued 
by  any  Governmental  Authority  in  connection  with  the  use,  storage,  handling,  treatment,  generation,  release  or  disposal  of  Hazardous 
Materials  (including,  without  limitation,  any  order  related  to  the  failure  to  make  a  required  reporting  to  any  Governmental  Authority).    If 
Landlord determines that this representation and warranty was not true as of the date of this lease, Landlord shall have the right to terminate 
this Lease in Landlord’s sole and absolute discretion.

(d) Testing.  Landlord shall have the right to conduct annual tests of the Premises to determine whether any contamination of the 
Premises  or  the  Project  has  occurred  as  a  result  of  Tenant’s  use.    Tenant  shall  be  required  to  pay  the  cost  of  such  annual  test  of  the 
Premises if there is violation of this Section 30 or if contamination for which Tenant is responsible under this Section 30 is identified; provided, 
however, that if Tenant conducts its own tests of the Premises using third party contractors and test procedures reasonably acceptable to 
Landlord  which  tests  are  certified  to  Landlord,  Landlord  shall  accept  such  tests  in  lieu  of  the  annual  tests  to  be  paid  for  by  Tenant.    In 
addition, at any time, and from time to time, prior to the expiration or earlier termination of the Term, Landlord shall have the right to conduct 
appropriate tests of the Premises and the Project to determine if contamination has occurred as a result of Tenant’s use of the Premises.  In 
connection with such testing, upon the request of Landlord, Tenant shall deliver to Landlord or its consultant such non-proprietary information 
concerning the use of Hazardous Materials in or about the Premises by Tenant or any Tenant Party.  If contamination has occurred for which 
Tenant is liable under this Section 30, Tenant shall pay all costs to conduct such tests.  If no such contamination is found, Landlord shall pay 
the costs of such tests (which shall not constitute an Operating Expense).  Landlord shall provide Tenant with a copy of all third party, non-
confidential  reports  and  tests  of  the  Premises  made  by  or  on  behalf  of  Landlord  during  the  Term  without  representation  or  warranty  and 
subject to a confidentiality agreement.  Tenant shall, at its sole cost and expense, promptly and satisfactorily remediate any environmental 
conditions  identified  by  such  testing  in  accordance  with  all  Environmental  Requirements.    Landlord’s  receipt  of  or  satisfaction  with  any 
environmental assessment in no way waives any rights which Landlord may have against Tenant. 

 
 
 
 
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(e) Control Areas.  Tenant shall be allowed to utilize up to its pro rata share of the Hazardous Materials inventory within any control 
area  or  zone  (located  within  the  Premises),  as  designated  by  the  applicable  building  code,  for  chemical  use  or  storage.    As  used  in  the 
preceding  sentence,  Tenant’s  pro  rata  share  of  any  control  areas  or  zones  located  within  the  Premises  shall  be  determined  based  on  the 
rentable square footage that Tenant leases within the applicable control area or zone.  For purposes of example only, if a control area or zone 
contains  10,000  rentable  square  feet  and  2,000  rentable  square  feet  of  a  tenant’s  premises  are  located  within  such  control  area  or  zone 
(while such premises as a whole contains 5,000 rentable square feet), the applicable tenant’s pro rata share of such control area would be 
20%.

(f) Storage Tanks.  If storage tanks storing Hazardous Materials located on the Premises or the Project are used by Tenant or are 
hereafter placed on the Premises or the Project by Tenant, Tenant shall install, use, monitor, operate, maintain, upgrade and manage such 
storage tanks, maintain appropriate records, obtain and maintain appropriate insurance, implement reporting procedures, properly close any 
storage tanks, and take or cause to be taken all other actions necessary or required under applicable state and federal Legal Requirements, 
as such now exists or may hereafter be adopted or amended in connection with the installation, use, maintenance, management, operation, 
upgrading and closure of such storage tanks.  Notwithstanding anything to the contrary contained herein, Tenant shall have no right to use or 
install any underground storage tanks at the Project.  Tenant shall have no right to use or install any underground or other storage tanks at 
the Project.

(g) Tenant’s Obligations.  Tenant’s obligations under this Section 30 shall survive the expiration or earlier termination of the Lease.  
During any period of time after the expiration or earlier termination of this Lease required by Tenant or Landlord to complete the removal from 
the Premises of any Hazardous Materials (including, without limitation, the release and termination of any licenses or permits restricting the 
use of the Premises and the completion of the approved Decommissioning and HazMat Closure Plan), Tenant shall continue to pay the full 
Rent in accordance with this Lease for any portion of the Premises not relet by Landlord in Landlord’s sole discretion, which Rent shall be 
prorated daily.

(h) Definitions.    As  used  herein,  the  term  “Environmental  Requirements”  means  all  applicable  present  and  future  statutes, 
regulations, ordinances, rules, codes, judgments, orders or other similar enactments of any Governmental Authority regulating or relating to 
health, safety, or environmental conditions on, under, or about the Premises or the Project, or the environment, including without limitation, 
the following:  the Comprehensive Environmental Response, Compensation and Liability Act; the Resource Conservation and Recovery Act; 
and  all  state  and  local  counterparts  thereto,  and  any  regulations  or  policies  promulgated  or  issued  thereunder.    As  used  herein,  the  term 
“Hazardous  Materials”  means  and  includes  any  substance,  material,  waste,  pollutant,  or  contaminant  listed  or  defined  as  hazardous  or 
toxic,  or  regulated  by  reason  of  its  impact  or  potential  impact  on  humans,  animals  and/or  the  environment  under  any  Environmental 
Requirements, asbestos and petroleum, including crude oil or any fraction thereof, natural gas liquids, liquefied natural gas, or synthetic gas 
usable  for  fuel  (or  mixtures  of  natural  gas  and  such  synthetic  gas).    As  defined  in  Environmental  Requirements,  Tenant  is  and  shall  be 
deemed to be the “operator” of Tenant’s “facility” and the “owner”  of  all  Hazardous  Materials  brought  on  the  Premises  by  Tenant  or  any
Tenant Party, and the wastes, by-products, or residues generated, resulting, or produced therefrom.

31. Tenant’s Remedies/Limitation of Liability.  Landlord shall not be in default hereunder unless Landlord fails to perform any of 
its  obligations  hereunder  within  30  days  after  written  notice  from  Tenant  specifying  such  failure  (unless  such  performance  will,  due  to  the 
nature  of  the  obligation,  require  a  period  of  time  in  excess  of  30  days,  then,  so  long  as  Landlord  continues  to  use  reasonable  efforts  to 
perform,  after  such  period  of  time  as  is  reasonably  necessary).    Upon  any  default  by  Landlord,  Tenant  shall  give  notice  by  registered  or 
certified mail to any Holder of a Mortgage covering the Premises and to any landlord of any lease of property in or on which the Premises are 
located and Tenant shall offer such Holder and/or landlord a reasonable opportunity to cure the default, including time to obtain possession of 
the Project by power of sale or a judicial action if such should prove necessary to effect a cure; provided Landlord shall have furnished to 
Tenant in writing the names and addresses of all such persons who are to receive such notices.  All obligations of Landlord hereunder shall 
be construed as covenants, not conditions; 

 
 
 
 
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and, except as may be otherwise expressly provided in this Lease, Tenant may not terminate this Lease for breach of Landlord’s obligations 
hereunder.

All obligations of Landlord under this Lease will be binding upon Landlord only during the period of its ownership of the Premises and 
not thereafter.  The term “Landlord” in this Lease shall mean only the owner for the time being of the Premises.  Upon the transfer by such 
owner  of  its  interest  in  the  Premises,  such  owner  shall  thereupon  be  released  and  discharged  from  all  obligations  of  Landlord  thereafter 
accruing, but such obligations shall be binding during the Term upon each new owner for the duration of such owner’s ownership.

32. Inspection and Access.  Subject to the terms and conditions of this Section 32, Landlord and its agents, representatives, and 
contractors  may  enter  the  Premises  at  any  reasonable  time  to  inspect  the  Premises  and  to  make  such  repairs  as  may  be  required  or 
permitted  pursuant  to  this  Lease  and  for  any  other  business  purpose.    Landlord  and  Landlord’s  representatives  may  enter  the  Premises 
during business hours on not less than 48 hours advance written notice (except in the case of emergencies in which case no such notice 
shall be required and such entry may be at any time) for the purpose of effecting any such repairs, inspecting the Premises, showing the 
Premises to prospective purchasers and, during the last year of the Term, to prospective tenants or for any other business purpose.  Landlord 
may erect a suitable sign (i) on the Premises stating the Premises are available to let during the last 9 months of the Term and (ii) at the 
Project stating that the Project is available for sale.  Landlord may grant easements, make public dedications, designate Common Areas and 
create  restrictions  on  or  about  the  Premises,  provided  that  no  such  easement,  dedication,  designation  or  restriction  materially,  adversely 
affects Tenant’s use or occupancy of the Premises for the Permitted Use.  At Landlord’s request, Tenant shall execute such instruments as 
may be necessary for such easements, dedications or restrictions.  Tenant shall at all times, except in the case of emergencies, have the 
right to escort Landlord or its agents, representatives, contractors or guests while the same are in the Premises, provided such escort does 
not  materially  and  adversely  affect  Landlord’s  access  rights  hereunder.    During  Landlord’s  access  of  the  Premises,  Landlord  shall  use 
reasonable efforts to comply with Tenant’s reasonable safety and security requirements; provided, however, that Tenant has notified Landlord 
of such safety and security requirements prior to Landlord’s entry into the Premises.  

33. Security.  Tenant acknowledges and agrees that security devices and services, if any, while intended to deter crime may not in 
given  instances  prevent  theft  or  other  criminal  acts  and  that  Landlord  is  not  providing  any  security  services  with  respect  to  the  Premises.  
Tenant agrees that Landlord shall not be liable to Tenant for, and Tenant waives any claim against Landlord with respect to, any loss by theft 
or  any  other  damage  suffered  or  incurred  by  Tenant  in  connection  with  any  unauthorized  entry  into  the  Premises  or  any  other  breach  of 
security  with  respect  to  the  Premises.    Tenant  shall  be  solely  responsible  for  the  personal  safety  of  Tenant’s  officers,  employees,  agents, 
contractors,  guests  and  invitees  while  any  such  person  is  in,  on  or  about  the  Premises  and/or  the  Project.    Tenant  shall  at  Tenant’s  cost 
obtain insurance coverage to the extent Tenant desires protection against such criminal acts.

34. Force Majeure.  Except for the payment of Rent, neither Landlord nor Tenant shall be held responsible or liable for delays in the 
performance of its obligations hereunder when caused by, related to, or arising out of acts of God, sinkholes or subsidence, strikes, lockouts, 
or other labor disputes, embargoes, quarantines, weather, national, regional, or local disasters, calamities, or catastrophes, inability to obtain 
labor  or  materials  (or  reasonable  substitutes  therefor)  at  reasonable  costs  or  failure  of,  or  inability  to  obtain,  utilities  necessary  for 
performance, governmental restrictions, orders, limitations, regulations, or controls, national emergencies, local, regional or national epidemic 
or pandemic, delay in issuance or revocation of permits, enemy or hostile governmental action, terrorism, insurrection, riots, civil disturbance 
or commotion, fire or other casualty, and other causes or events beyond their reasonable control (“Force Majeure”).

35. Brokers.    Landlord  and  Tenant  each  represents  and  warrants  that  it  has  not  dealt  with  any  broker,  agent  or  other  person 
(collectively, “Broker”) in connection with this transaction and that no Broker brought about this transaction, other than Jones Lang LaSalle 
and CBRE.  Landlord and Tenant each hereby agree to indemnify and hold the other harmless from and against any claims by any Broker, 
other 

 
 
 
 
 
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than Jones Lang LaSalle and CBRE, claiming a commission or other form of compensation by virtue of having dealt with Tenant or Landlord, 
as applicable, with regard to this leasing transaction. 

36. Limitation  on  Landlord’s  Liability.    NOTWITHSTANDING  ANYTHING  SET  FORTH  HEREIN  OR  IN  ANY  OTHER 
AGREEMENT  BETWEEN  LANDLORD  AND  TENANT  TO  THE  CONTRARY:    (A)  LANDLORD  SHALL  NOT  BE  LIABLE  TO  TENANT  OR
ANY OTHER PERSON FOR (AND TENANT AND EACH SUCH OTHER PERSON ASSUME ALL RISK OF) LOSS, DAMAGE OR INJURY, 
WHETHER  ACTUAL  OR  CONSEQUENTIAL  TO:    TENANT’S  PERSONAL  PROPERTY  OF  EVERY  KIND  AND  DESCRIPTION, 
INCLUDING,  WITHOUT  LIMITATION  TRADE  FIXTURES,  EQUIPMENT, 
INVENTORY,  SCIENTIFIC  RESEARCH,  SCIENTIFIC 
EXPERIMENTS, LABORATORY ANIMALS, PRODUCT, SPECIMENS, SAMPLES, AND/OR SCIENTIFIC, BUSINESS, ACCOUNTING AND 
OTHER  RECORDS  OF  EVERY  KIND  AND  DESCRIPTION  KEPT  AT  THE  PREMISES  AND  ANY  AND  ALL  INCOME  DERIVED  OR 
DERIVABLE THEREFROM; (B) THERE SHALL BE NO PERSONAL RECOURSE TO LANDLORD FOR ANY ACT OR OCCURRENCE IN, 
ON OR ABOUT THE PREMISES OR ARISING IN ANY WAY UNDER THIS LEASE OR ANY OTHER AGREEMENT BETWEEN LANDLORD 
AND  TENANT  WITH  RESPECT  TO  THE  SUBJECT  MATTER  HEREOF  AND  ANY  LIABILITY  OF  LANDLORD  HEREUNDER  SHALL  BE 
STRICTLY LIMITED SOLELY TO LANDLORD’S INTEREST IN THE PROJECT OR ANY PROCEEDS FROM SALE OR CONDEMNATION 
THEREOF  AND  ANY  INSURANCE  PROCEEDS  PAYABLE  IN  RESPECT  OF  LANDLORD’S  INTEREST  IN  THE  PROJECT  OR  IN 
CONNECTION  WITH  ANY  SUCH  LOSS;  AND  (C)  IN  NO  EVENT  SHALL  ANY  PERSONAL  LIABILITY  BE  ASSERTED  AGAINST 
LANDLORD IN CONNECTION WITH THIS LEASE NOR SHALL ANY RECOURSE BE HAD TO ANY OTHER PROPERTY OR ASSETS OF 
LANDLORD  OR  ANY  OF  LANDLORD’S  OFFICERS,  DIRECTORS,  EMPLOYEES,  AGENTS  OR  CONTRACTORS.    UNDER  NO 
CIRCUMSTANCES  SHALL  LANDLORD  OR  ANY  OF  LANDLORD’S  OFFICERS,  DIRECTORS,  EMPLOYEES,  AGENTS  OR 
CONTRACTORS BE LIABLE FOR INJURY TO TENANT’S BUSINESS OR FOR ANY LOSS OF INCOME OR PROFIT THEREFROM.

Tenant acknowledges and agrees that measures and/or services implemented at the Project, if any, intended to encourage social 
distancing, promote and protect health and physical well-being and/or intended to limit the spread of Infectious Conditions, may not prevent 
the spread of such Infectious Conditions.  Neither Landlord nor any Landlord Indemnified Parties shall have any liability and Tenant waives 
any  claims  against  Landlord  and  the  Landlord  Indemnified  Parties  with  respect  to  any  loss,  damage  or  injury  in  connection  with  (x)  the 
implementation,  or  failure  of  Landlord  or  any  Landlord  Indemnified  Parties  to  implement,  any  measures  and/or  services  at  the  Project 
intended to encourage social distancing, promote and protect health and physical well-being and/or intended to limit the spread of Infectious 
Conditions,  or  (y)  the  failure  of  any  measures  and/or  services  implemented  at  the  Project,  if  any,  to  limit  the  spread  of  any  Infectious 
Conditions.

37. Severability.  If any clause or provision of this Lease is illegal, invalid or unenforceable under present or future laws, then and in 
that event, it is the intention of the parties hereto that the remainder of this Lease shall not be affected thereby.  It is also the intention of the 
parties to this Lease that in lieu of each clause or provision of this Lease that is illegal, invalid or unenforceable, there be added, as a part of 
this Lease, a clause or provision as similar in effect to such illegal, invalid or unenforceable clause or provision as shall be legal, valid and 
enforceable.

38. Signs; Exterior Appearance.  Tenant shall not, without the prior written consent of Landlord, which may be granted or withheld 
in  Landlord’s  sole  discretion:    (i)  attach  any  awnings,  exterior  lights,  decorations,  balloons,  flags,  pennants,  banners,  painting  or  other 
projection to any outside wall of the Project, (ii) use any curtains, blinds, shades or screens other than Landlord’s standard window coverings, 
(iii) coat or otherwise sunscreen the interior or exterior of any windows, (iv) place any bottles, parcels, or other articles on the window sills, (v) 
place  any  equipment,  furniture  or  other  items  of  personal  property  on  any  exterior  balcony,  or  (vi)  paint,  affix  or  exhibit  on  any  part  of  the 
Premises or the Project any signs, notices, window or door lettering, placards, decorations, or advertising media of any type which can be 
viewed from the exterior of the Premises.  Interior signs on doors and the directory tablet shall be inscribed, painted or affixed for Tenant by 
Landlord at the sole cost and expense of Tenant, and shall be of a size, color and type acceptable to Landlord.  Nothing may be placed on 
the exterior of corridor walls or 

 
 
 
 
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corridor  doors  other  than  Landlord’s  standard  lettering.    The  directory  tablet  shall  be  provided  exclusively  for  the  display  of  the  name  and 
location of tenants.

Tenant  shall  have  the  exclusive  right  to  display,  at  Tenant’s  cost  and  expense,  one  (1)  sign  bearing  Tenant’s  name  and/or  logo 
(each,  a  “Building Sign”)  at  one  (1)  location  on  the  building  façade  reasonably  acceptable  to  Landlord  and  Tenant.    Notwithstanding  the 
foregoing, Tenant acknowledges and agrees that the Building Sign including, without limitation, the size, color and type, shall be subject to 
Landlord’s  prior  written  approval,  which  shall  not  be  unreasonably  withheld,  conditioned  or  delayed,  shall  be  consistent  with  Landlord’s 
signage program at the Project and shall be subject to any and all other required approvals and applicable Legal Requirements.  Landlord 
shall  cooperate  with  Tenant,  at  no  cost  or  expense  to  Landlord,  in  Tenant’s  efforts  to  obtain  approvals  for  Tenant’s  Building  Sign  from  the 
applicable Governmental Authorities.  Tenant shall be responsible, at Tenant’s sole cost and expense, for the maintenance of the Building 
Sign, for the removal of the Building Sign at the expiration or earlier termination of this Lease and for the repair of all damage resulting from 
such removal.  The Building Sign shall be personal to Stoke Therapeutics, Inc., except that such right may be assigned in connection with 
any Permitted Assignment.

Tenant shall have the non-exclusive right to display, at Landlord’s cost and expense, Tenant’s name on the monument sign at the 
Project serving the Building (“Monument Sign”).  Tenant acknowledges and agrees that Tenant’s signage on the Monument Sign including, 
without  limitation,  the  location,  size,  color  and  type,  shall  be  subject  to  Landlord’s  prior  written  approval,  which  shall  not  be  unreasonably 
withheld  and  shall  be  consistent  with  Landlord’s  signage  program  at  the  Project  and  applicable  Legal  Requirements.    Tenant  shall  be 
responsible, at Tenant’s sole cost and expense, for the maintenance of Tenant’s signage on the Monument Sign, for the removal of Tenant’s 
signage from the Monument Sign at the expiration or earlier termination of this Lease and for the repair of all damage resulting from such 
removal.  Landlord agrees that the corporate logo, graphics and colors which are registered and in use by Tenant as of the date of this Lease 
have been approved by Landlord for use on Tenant’s signage at the Project.

39. Right to Extend Term.  Tenant shall have the right to extend the Term of the Lease upon the following terms and conditions:

(a) Extension Right.  Subject to the terms of Section 39(g) below, Tenant shall have 1 right (the “Extension Right”) to extend the 
term of this Lease for 2 years (the “Extension Term”) on the same terms and conditions as this Lease (other than with respect to Base Rent) 
by giving Landlord written notice of its election to exercise the Extension Right at least 15 months prior and not more than 18 months prior to 
the expiration of the Base Term of the Lease.

Upon  the  commencement  of  the  Extension  Term,  Base  Rent  shall  be  payable  at  the  Market  Rate  (as  defined  below).    Base  Rent  shall 
thereafter  be  adjusted  on  each  annual  anniversary  of  the  commencement  of  such  Extension  Term  by  a  percentage  as  agreed  upon  by 
Landlord  and  Tenant  at  the  time  the  Market  Rate  is  determined.    As  used  herein,  “Market  Rate”  shall  mean  the  rate  that  comparable 
landlords of comparable buildings have accepted in current transactions from non-equity (i.e., not being offered equity in the buildings) and 
nonaffiliated  tenants  of  similar  financial  strength  for  space  of  comparable  size,  quality  (including  Alterations  and  other  improvements)  and 
floor height in laboratory/office buildings in the Bedford area for a comparable term, with the determination of the Market Rate to take into 
account all relevant factors, including tenant inducements, percentage of laboratory and office space, views, project amenities, parking costs, 
leasing  commissions,  allowances  or  concessions,  if  any.    Notwithstanding  anything  to  the  contrary  contained  herein,  in  no  event  shall  the 
Market  Rate  for  the  first  year  of  the  Extension  Term  be  less  than  the  Base  Rent  payable  as  of  the  date  immediately  preceding  the 
commencement of the Extension Term.

If,  on  or  before  the  date  which  is  240  days  prior  to  the  expiration  of  the  Base  Term  of  this  Lease,  Tenant  has  not  agreed  with 
Landlord’s determination of the Market Rate and the rent escalations during the Extension Term after negotiating in good faith, Tenant shall 
be  deemed  to  have  elected  arbitration  as  described  in  Section  39(b).    Tenant  acknowledges  and  agrees  that,  if  Tenant  has  elected  to 
exercise the 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 32

Extension Right by delivering notice to Landlord as required in this Section 39(a), Tenant shall have no right thereafter to rescind or elect not 
to extend the term of the Lease for the Extension Term.  

(b) Arbitration.  

(i)

Within  10  days  of  Tenant’s  notice  to  Landlord  of  its  election  (or  deemed  election)  to  arbitrate  Market  Rate  and 
escalations, each party shall deliver to the other a proposal containing the Market Rate and escalations that the submitting party 
believes  to  be  correct  (“Extension  Proposal”).    If  either  party  fails  to  timely  submit  an  Extension  Proposal,  the  other  party’s 
submitted  proposal  shall  determine  the  Base  Rent  and  escalations  for  the  Extension  Term.    If  both  parties  submit  Extension 
Proposals, then Landlord and Tenant shall meet within 7 days after delivery of the last Extension Proposal and make a good faith 
attempt to mutually appoint a single Arbitrator (and defined below) to determine the Market Rate and escalations.  If Landlord and 
Tenant are unable to agree upon a single Arbitrator, then each shall, by written notice delivered to the other within 10 days after the 
meeting, select an Arbitrator.  If either party fails to timely give notice of its selection for an Arbitrator, the other party’s submitted 
proposal shall determine the Base Rent for the Extension Term.  The 2 Arbitrators so appointed shall, within 5 business days after 
their  appointment,  appoint  a  third  Arbitrator.    If  the  2  Arbitrators  so  selected  cannot  agree  on  the  selection  of  the  third  Arbitrator 
within the time above specified, then either party, on behalf of both parties, may request such appointment of such third Arbitrator 
by  application  to  any  state  court  of  general  jurisdiction  in  the  jurisdiction  in  which  the  Premises  are  located,  upon  10  days  prior 
written notice to the other party of such intent.

(ii)

The  decision  of  the  Arbitrator(s)  shall  be  made  within  30  days  after  the  appointment  of  a  single  Arbitrator  or  the 
third Arbitrator, as applicable.  The decision of the single Arbitrator shall be final and binding upon the parties.  The average of the 
two  closest  Arbitrators  in  a  three  Arbitrator  panel  shall  be  final  and  binding  upon  the  parties.    Each  party  shall  pay  the  fees  and 
expenses of the Arbitrator appointed by or on behalf of such party and the fees and expenses of the third Arbitrator shall be borne 
equally by both parties.  If the Market Rate and escalations are not determined by the first day of the Extension Term, then Tenant 
shall pay Landlord Base Rent in an amount equal to the Base Rent in effect immediately prior to the Extension Term and increased 
by the Rent Adjustment Percentage until such determination is made.  After the determination of the Market Rate and escalations, 
the parties shall make any necessary adjustments to such payments made by Tenant.  Landlord and Tenant shall then execute an 
amendment recognizing the Market Rate and escalations for the Extension Term.

(iii)

An  “Arbitrator”  shall  be  any  person  appointed  by  or  on  behalf  of  either  party  or  appointed  pursuant  to  the 
provisions hereof and:  (i) shall be (A) a member of the American Institute of Real Estate Appraisers with not less than 10 years of 
experience in the appraisal of improved office and high tech industrial real estate in the greater Lexington, Bedford and Waltham 
metropolitan area, or (B) a licensed commercial real estate broker with not less than 15 years’ experience representing landlords 
and/or tenants in the leasing of high tech or life sciences space in the greater Lexington, Bedford and Waltham metropolitan area, 
(ii) devoting substantially all of their time to professional appraisal or brokerage work, as applicable, at the time of appointment and 
(iii) be in all respects impartial and disinterested.  Any Arbitrator who has worked in any capacity for either Landlord or Tenant in the 
preceding five (5) years shall be disqualified from serving as an Arbitrator under this Section 39(b).

(c) Rights Personal.  The Extension Right is personal to Tenant and is not assignable without Landlord’s consent, which may be 
granted or withheld in Landlord’s sole discretion separate and apart from any consent by Landlord to an assignment of Tenant’s interest in 
the Lease, except that they may be assigned in connection with any Permitted Assignment of this Lease.

(d) Exceptions.  Notwithstanding anything set forth above to the contrary, the Extension Right shall, at Landlord’s option, not be in 

effect and Tenant may not exercise the Extension Right:

 
 
 
 
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(i)

during any period of time that Tenant is in Default under any provision of this Lease; or

(ii)

if Tenant has been in Default under any provision of this Lease 3 or more times, whether or not the Defaults are 
cured, during the 12-month period immediately prior to the date that Tenant intends to exercise the Extension Right, whether or not 
the Defaults are cured.

(e) No Extensions.  The period of time within which the Extension Right may be exercised shall not be extended or enlarged by 

reason of Tenant’s inability to exercise the Extension Right.

(f) Termination.  The Extension Right shall, at Landlord’s option, terminate and be of no further force or effect even after Tenant’s 
due and timely exercise of the Extension Right, if, after such exercise, but prior to the commencement date of the Extension Term, (i) Tenant 
fails to timely cure any default by Tenant under this Lease; or (ii) Tenant has Defaulted 3 or more times during the period from the date of the 
exercise of the Extension Right to the date of the commencement of the Extension Term, whether or not such Defaults are cured.

(g) Subordinate.  Tenant’s Extension Right granted pursuant to Section 39(a) above is and shall remain subject and subordinate to 

the right of Homology to lease the Premises pursuant to a separate agreement between Landlord and Homology.

40. Early Termination Right.  Subject to the provisions of this Section 40, only if Tenant has entered into a new lease with Landlord 
or  an  affiliate  of  Landlord  (“Affiliate”)  pursuant  to  which  Tenant  shall  lease  space  from  Landlord  or  Landlord’s  Affiliate  in  Massachusetts 
containing no less than 40,000 rentable square feet (the “New Premises”) upon terms and conditions acceptable to Landlord (or Landlord’s 
Affiliate) and Tenant, each in their respective sole discretion (“New Lease”), then Tenant shall have the right to terminate this Lease as of the 
Early Termination Date without the payment of a termination fee, by delivery of written notice to Landlord (“Termination Notice”) concurrently 
with  or  prior  to  the  date  that  Landlord  (or  Landlord’s  Affiliate)  and  Tenant  enter  into  a  New  Lease.    If  Tenant  and  Landlord  (or  Landlord’s 
Affiliate) enter into a New Lease and Tenant delivers a Termination Notice, as provided above, to Landlord, then Landlord and Tenant shall, 
concurrently with the execution of the New Lease, enter into an amendment to this Lease providing for the early termination of this Lease as 
of the date agreed upon by Landlord and Tenant is such amendment (the “Early  Termination  Date”).    Tenant  acknowledges  that  nothing 
contained herein shall obligate Landlord or Landlord’s Affiliate in any way to enter into a New Lease nor shall anything contained herein be 
construed to grant to Tenant any option or right to lease any space at another property owned by Landlord or any Landlord’s Affiliate.  

41. Miscellaneous.

(a) Notices.    All  notices  or  other  communications  between  the  parties  shall  be  in  writing  and  shall  be  deemed  duly  given  upon 
delivery or refusal to accept delivery by the addressee thereof if delivered in person, or upon actual receipt if delivered by reputable overnight 
guaranty courier, addressed and sent to the parties at their addresses set forth above.  Landlord and Tenant may from time to time by written 
notice to the other designate another address for receipt of future notices.

(b) Joint and Several Liability.  If and when included within the term “Tenant,” as used in this instrument, there is more than one 

person or entity, each shall be jointly and severally liable for the obligations of Tenant.

(c) Financial Information.  Tenant shall furnish to Landlord with true and complete copies of (i) upon Landlord’s written request on 
an annual basis, Tenant’s most recent audited annual financial statements, provided, however, that Tenant shall not be required to deliver to 
Landlord such annual financial statements for any particular year sooner than the date that is 90 days after the end of each of Tenant’s fiscal 
years  during  the  Term,  (ii)  upon  Landlord’s  written  request  on  a  quarterly  basis,  Tenant’s  most  recent  unaudited  quarterly  financial 
statements; provided, however, that Tenant shall not be required to deliver to 

 
 
 
 
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Landlord such quarterly financial statements for any particular quarter sooner that the date that is 45 days after the end of each of Tenant’s 
fiscal quarters during the Term, (iii) upon Landlord’s written request from time to time, updated business plans, including cash flow projections 
and/or pro forma balance sheets and income statements, all of which shall be treated by Landlord as confidential information belonging to 
Tenant,  (iv)  upon  Landlord’s  written  request  from  time  to  time,  corporate  brochures  and/or  profiles  prepared  by  Tenant  for  prospective 
investors,  and  (v)  upon  Landlord’s  written  request  from  time  to  time,  any  other  financial  information  or  summaries  that  Tenant  typically 
provides  to  its  lenders  or  shareholders.    Notwithstanding  anything  to  the  contrary  contained  in  this  Lease,  Landlord’s  written  request  for 
financial  information  pursuant  to  this  Section 41(c)  may  delivered  to  Tenant  via  email.    So  long  as  Tenant  is  a  “public  company”  and  its 
financial information is publicly available, then the foregoing delivery requirements of this Section 41(c) shall not apply.

Landlord agrees to hold the financial statements and other financial information provided under this section in confidence using at 
least  the  same  degree  of  care  that  Landlord  uses  to  protect  its  own  confidential  information  of  a  similar  nature;  provided,  however,  that 
Landlord  may  disclose  such  information  to  Landlord’s  auditors,  attorneys,  consultants,  lenders,  affiliates,  prospective  purchasers  and 
investors and other third parties as reasonably required in the ordinary course of Landlord’s operations, provided that Landlord shall request 
that such parties treat the information as confidential.  The obligations of confidentiality hereunder shall not apply to information that was in 
the public domain at the time it was disclosed to Landlord, entered into the public domain subsequent to the time it was disclosed to Landlord 
through no fault of Landlord, or was disclosed by Tenant to a third party without any confidentiality restrictions.  In addition, Landlord may 
disclose such information without violating this section to the extent that disclosure is reasonably necessary (x) for Landlord to enforce its 
rights or defend itself under this Lease; (y) for required submissions to any state or federal regulatory body; or (z) for compliance with a valid 
order of a court or other governmental body having jurisdiction, or any law, statute, or regulation, provided that, other than in an emergency, 
before disclosing such information, Landlord shall give Tenant 5 business days’ prior notice of the same to allow Tenant to obtain a protective 
order or such other judicial relief.

(d) Recordation.    Neither  this  Lease  nor  a  memorandum  of  lease  shall  be  filed  by  or  on  behalf  of  Tenant  in  any  public  record.  

Landlord may prepare and file, and upon request by Landlord Tenant will execute, a memorandum of lease.  

(e) Interpretation.  The normal rule of construction to the effect that any ambiguities are to be resolved against the drafting party 
shall not be employed in the interpretation of this Lease or any exhibits or amendments hereto.  Words of any gender used in this Lease shall 
be held and construed to include any other gender, and words in the singular number shall be held to include the plural, unless the context 
otherwise requires.  The captions inserted in this Lease are for convenience only and in no way define, limit or otherwise describe the scope 
or intent of this Lease, or any provision hereof, or in any way affect the interpretation of this Lease.

(f) Not Binding Until Executed.  The submission by Landlord to Tenant of this Lease shall have no binding force or effect, shall 
not constitute an option for the leasing of the Premises, nor confer any right or impose any obligations upon either party until execution of this 
Lease by both parties.

(g) Limitations on Interest.  It is expressly the intent of Landlord and Tenant at all times to comply with applicable law governing 
the maximum rate or amount of any interest payable on or in connection with this Lease.  If applicable law is ever judicially interpreted so as 
to render usurious any interest called for under this Lease, or contracted for, charged, taken, reserved, or received with respect to this Lease, 
then  it  is  Landlord’s  and  Tenant’s  express  intent  that  all  excess  amounts  theretofore  collected  by  Landlord  be  credited  on  the  applicable 
obligation (or, if the obligation has been or would thereby be paid in full, refunded to Tenant), and the provisions of this Lease immediately 
shall  be  deemed  reformed  and  the  amounts  thereafter  collectible  hereunder  reduced,  without  the  necessity  of  the  execution  of  any  new 
document, so as to comply with the applicable law, but so as to permit the recovery of the fullest amount otherwise called for hereunder.

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 35

(h) Choice of Law.  Construction and interpretation of this Lease shall be governed by the internal laws of the state in which the 

Premises are located, excluding any principles of conflicts of laws.

(i) Time.  Time is of the essence as to the performance of Tenant’s obligations under this Lease.

(j) OFAC.  Tenant and all beneficial owners of Tenant are currently (a) in compliance with and shall at all times during the Term of 
this Lease remain in compliance with the regulations of the Office of Foreign Assets Control (“OFAC”) of the U.S. Department of Treasury 
and any statute, executive order, or regulation relating thereto (collectively, the “OFAC Rules”), (b) not listed on, and shall not during the term 
of  this  Lease  be  listed  on,  the  Specially  Designated  Nationals  and  Blocked  Persons  List,  Foreign  Sanctions  Evaders  List,  or  the  Sectoral 
Sanctions Identification List, which are all maintained by OFAC and/or on any other similar list maintained by OFAC or other governmental 
authority  pursuant  to  any  authorizing  statute,  executive  order,  or  regulation,  and  (c)  not  a  person  or  entity  with  whom  a  U.S.  person  is 
prohibited from conducting business under the OFAC Rules.

(k) Incorporation by Reference.  All exhibits and addenda attached hereto are hereby incorporated into this Lease and made a 

part hereof.  If there is any conflict between such exhibits or addenda and the terms of this Lease, such exhibits or addenda shall control.

(l) Entire Agreement.  This Lease, including the exhibits attached hereto, constitutes the entire agreement between Landlord and 
Tenant pertaining to the subject matter hereof and supersedes all prior and contemporaneous agreements, understandings, letters of intent, 
negotiations  and  discussions,  whether  oral  or  written,  of  the  parties,  and  there  are  no  warranties,  representations  or  other  agreements, 
express or implied, made to either party by the other party in connection with the subject matter hereof except as specifically set forth herein.

(m)No Accord and Satisfaction.  No payment by Tenant or receipt by Landlord of a lesser amount than the monthly installment of 
Base  Rent  or  any  Additional  Rent  will  be  other  than  on  account  of  the  earliest  stipulated  Base  Rent  and  Additional  Rent,  nor  will  any 
endorsement or statement on any check or letter accompanying a check for payment of any Base Rent or Additional Rent be an accord and 
satisfaction.    Landlord  may  accept  such  check  or  payment  without  prejudice  to  Landlord’s  right  to  recover  the  balance  of  such  Rent  or  to 
pursue any other remedy provided in this Lease.

(n) Hazardous Activities.    Notwithstanding  any  other  provision  of  this  Lease,  Landlord,  for  itself  and  its  employees,  agents  and 
contractors, reserves the right to refuse to perform any repairs or services in any portion of the Premises which, pursuant to Tenant’s routine 
safety guidelines, practices or custom or prudent industry practices, require any form of protective clothing or equipment other than safety 
glasses.  In any such case, Tenant shall contract with parties who are acceptable to Landlord, in Landlord’s reasonable discretion, for all such 
repairs and services, and Landlord shall, to the extent required, equitably adjust Tenant’s Share of Operating Expenses in respect of such 
repairs or services to reflect that Landlord is not providing such repairs or services to Tenant.

(o)   Shuttle  Services.    Landlord  and  affiliates  of  Landlord  plan  to  provide  a  campus  shuttle  service  for  the  Project  and  other 
buildings  in  the  vicinity  of  the  Project  that  are  owned  by  affiliates  of  Landlord  (the  “Shuttle  Service”);  provided,  however,  that  neither 
Landlord  nor  any  affiliate  of  Landlord  shall  be  obligated  to  provide  the  Shuttle  Service  (or,  once  the  Shuttle  Service  has  commenced,  to 
continue providing the Shuttle Service for any specific period of time) or to cause the Shuttle Service to follow any specific route, make any 
specific stops, or adhere to any specific schedule or hours of operation.  If Landlord and affiliates of Landlord actually commence operation of 
the  Shuttle  Service,  (i)  Landlord  shall  give  Tenant  written  notice  of  the  date  such  operation  will  commence  (“Shuttle  Services 
Commencement  Date”)  and  the  planned  route,  stops,  schedule,  and  hours  of  operation,  (ii)  Landlord  shall  permit  Tenant’s  employees 
actually  employed  at  the  Project  to  use  the  Shuttle  Service,  and  (iii)  regardless  of  whether  Tenant’s  employees  use  the  Shuttle  Services, 
commencing  on  later  to  occur  of  (x)  the  Shuttle  Services  Commencement  Date,  or  the  Commencement  Date,  through  the  earlier  of  the 
expiration of the Term or the date that Landlord permanently ceases to provide Shuttle Service, Operating Expenses shall include the 

 
 
 
 
45/47 Wiggins – Suites 100 & 200/Stoke - Page 36

cost  of  provision  the  Shuttle  Service  (the  “Shuttle  Service  Costs”).    Tenant  acknowledges  and  agrees  that  Landlord  has  not  made  any 
representations or warranties regarding the commencement or continued availability of the Shuttle Service and that Tenant is not entering 
into this Lease with an expectation that the Shuttle Service shall commence or continue to be available to Tenant throughout the Term.

(p) Counterparts.  This Lease may be executed in 2 or more counterparts, each of which shall be deemed an original, but all of 
which together shall constitute one and the same instrument.  Counterparts may be delivered via facsimile, electronic mail (including pdf or 
any electronic signature process complying with the U.S. federal ESIGN Act of 2000) or other transmission method and any counterpart so 
delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.  Electronic signatures shall be 
deemed original signatures for purposes of this Lease and all matters related thereto, with such electronic signatures having the same legal 
effect as original signatures.

[ Signatures on next page ]

 
 
 
 
 
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IN WITNESS WHEREOF, Landlord and Tenant have executed this Lease as of the day and year first above written.

TENANT:

STOKE THERAPEUTICS, INC.,
a Delaware corporation

By: /s/ Edward M. Kaye 
Name: Edward M. Kaye
Its: Chief Executive Officer

By: /s/ Huw M. Nash 
Name: Huw M. Nash
Its: COO & CBO

LANDLORD:

ARE-MA REGION NO. 24, LLC, 
a Delaware limited liability company

By:  ALEXANDRIA REAL ESTATE EQUITIES, L.P., 
a Delaware limited partnership, 
managing member

By:  ARE-QRS CORP., 

a Maryland corporation, 
general partner

By: /s/ Allison Grochola   

Its: SVP – Real Estate Legal Affairs

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
THIS FIRST AMENDMENT TO LEASE (this “Amendment”) dated as of this 12th day of December, 2023 (the “Effective Date”), is 
entered into by and between XENON PROPERTY, LLC, a Delaware limited liability company (“Landlord”), as successor in interest to ARE-
MA Region No. 24, LLC, and STOKE THERAPEUTICS, INC., a Delaware corporation (“Tenant”).

FIRST AMENDMENT TO LEASE

WITNESSETH:

A. Reference is made to that certain Lease Agreement dated as of September 8, 2021 (the “Lease”),  by and between ARE-MA 

Region No. 43, LLC (hereinafter, “Original Landlord”), as landlord, and Tenant, as tenant, with respect to certain premises 
containing approximately 38,000 rentable square feet (the “Premises”), consisting of the entire building  known and numbered 
as 45-47 Wiggins Avenue, Bedford, Massachusetts (the “Building”).  

B.

Landlord is the current owner of the Building and the current holder of the Landlord’s interest under the Lease. 

C. The Term of the Lease is currently scheduled to expire on December 31, 2024.

D. The parties desire to: (i) extend the Term of the Lease for an additional period of two (2) years, commencing on January 1, 

2025 and expiring on December 31, 2026, and (ii) amend the Lease in certain other respects, all as hereinafter set forth.  
Capitalized terms not defined herein shall have the same meaning ascribed to such terms in the Lease.  

NOW, THEREFORE, in consideration of the mutual covenants and conditions contained herein and other good and valuable 

consideration, the receipt and sufficiency of which are hereby acknowledged, the parties agree as follows:

Agreements

1. Additional Base Term. The Term of the Lease is hereby extended beyond December 31, 2024, for a period of two (2) years, 

commencing on January 1, 2025 (the “Additional Base Term Commencement Date”) and ending on December 31, 2026 (the “Additional 
Base Term”).  All references to the “Term” under the Lease shall mean the Base Term and the Additional Base Term, as may be further 
extended by the Extension Term pursuant to the Extension Right (as defined below) in accordance with the terms of the Lease, as amended 
hereby.  All terms and provisions of the Lease, as amended hereby, shall apply to Tenant’s leasing of the Premises for and during the 
Additional Base Term, except to the extent expressly provided otherwise herein.

2. Condition of Premises.  The Premises are being leased to Tenant for the Additional Base Term in their then current “as-is, 

where-is” condition, without representation or warranty by Landlord and without any obligation to provide any construction or tenant 
improvement allowances, or to perform any construction therein or otherwise prepare the same for Tenant’s occupancy; provided, however, 
that, effective as of the Effective Date the Landlord agrees to meet with Tenant at least once per month to confer and address any repair and 
maintenance items related to the Building and/or Premises, and, if requested, such meeting shall include both a Landlord representative and 
a representative from the management company retained by Landlord to manage the Project.  Additionally, effective as of the Effective Date 
and for so long as Tenant is the sole tenant of the Building, Landlord shall allow and provide to Tenant access to the Building’s HVAC controls 
systems for the purpose of adjusting temperature set points within the Premises.  The HVAC control system to which Tenant will have access 
will include all FPs, VAVs and CAVs and RTUs specific to the 45 and 47 office areas only.  Landlord shall have no responsibility or liability 
whatsoever with respect to the temperature set points within the office areas (including as a result of any of Tenant’s adjustments to the 
temperature set points within the office 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
areas), nor any responsibility or liability with respect to any impact thereof on Tenant’s laboratory operations.  For the avoidance of doubt, the 
foregoing shall not alter, amend or impact the Landlord’s responsibility for normal repair and maintenance of the Building Systems under the 
Lease, subject to inclusion of the costs thereof in Operating Expenses, and subject to the other terms and provisions of the Lease. 

3. Amendments.  The Lease is hereby amended as follows:

(q) Landlord.    Effective  as  of  the  Effective  Date,  the  term  “Landlord”  is  hereby  amended  to  mean  and  refer  to 

“Xenon Property, LLC, a Delaware limited liability company”.  

(r) Landlord’s Notice Address.  Effective as of the Effective Date, in the introductory section of the Lease, the 
subsection thereof in which the term “Landlord’s Notice Address” is defined is hereby amended to read in its entirety as 
follows:

Landlord’s Notice Address:
Xenon Property, LLC
c/o TPG Real Estate
345 California Street, Suite 300
San Francisco, CA 94104
Attn:  Jacob Muller, Principal

With copies of any notices to Landlord sent to:

c/o Anchor Line Partners, LLC
One Post Office Square, Floor 36
Boston, MA 02109
Attn:  Andrew J. Maher

And to:

Nutter, McClennen & Fish, LLP
Seaport West
155 Seaport Boulevard
Boston, MA 02210
Attn:  Michael F. Burke, Esq.

(s) Address for Rent Payment.  Effective as of the Effective Date, in the introductory section of the Lease, the 
subsection thereof in which the term “Address for Rent Payment” is defined is hereby amended to read in its entirety as 
follows:

Address for Rent Payment: 

P.O. Box:
Xenon Property, LLC
P.O. Box 411343

Boston, MA 02241-1343

or

Bank Wire Transfer:
Bank Of America N.A.
ABA#: 026009593
Account#: 4451719182
Account Name:  Xenon Property, LLC

2

 
 
 
 
 
 
 
 
 
 
 
 
 
(t) Base Rent.  Effective as of the Additional Base Term Commencement Date, in the introductory section of the 
Lease, the subsection thereof in which the term “Base Rent” is defined, is hereby amended for the Additional Base Term 
as follows: 

Period

From

1/1/25

1/1/26

Through

12/31/25

12/31/26

Annual Base Rent

Monthly Installment of Base Rent

$2,489,000.00

$2,563,670.00

$207,416.67

$213,639.17

For the avoidance of doubt, effective as of the Additional Base Term Commencement Date, Section 4 (Base Rent Adjustments) of the 
Lease is inapplicable and the adjustments to Base Rent shall be governed by this Section 3(d) of this Amendment.

(u) Additional Rent.  For and during the Additional Base Term, Tenant shall continue to be obligated to pay all 

Additional Rent, including, without limitation, Operating Expenses and Utilities, all as provided in the Lease.  

(v) Extension Option.  Effective as of the Effective Date, Section 39 (Right to Extend Term) of the Lease shall be 
deleted and shall have no further force or effect.  Tenant shall have the right to extend the Term of the Lease beyond the 
Additional Base Term for an additional period of five (5) years, pursuant and subject to the terms and conditions set forth 
in Exhibit A attached hereto.

4. Miscellaneous.  Tenant hereby acknowledges that, as of the Effective Date, (a) Landlord has no undischarged obligations under 
the Lease to perform any work or improvements to the Premises or to provide any tenant improvement allowance under the Lease, (b) there 
are no offsets or defenses that Tenant has against the full enforcement of the Lease by Landlord, (c) Tenant has not assigned, transferred or 
hypothecated the Lease or any interest therein and is not currently subleasing all or any portion of the Premises, and (d) to the best of 
Tenant’s knowledge, Landlord is not in default under the Lease.  

5. Brokers.  Landlord and Tenant hereby represent and warrant to each other that neither has dealt with any real estate broker or 

agent in connection with the procurement of this Amendment, except for Jones Lang LaSalle (the “Broker”).  Each party agrees to indemnify 
and hold harmless the other from any costs, expense or liability (including costs of suit and reasonable attorneys’ fees) for any 
compensation, commission or fees claimed by any real estate broker or agent in connection with the procurement of this Amendment (other 
than the Broker) because of any act or statement by the indemnifying party.  Landlord shall be responsible for paying any commission due to 
the Broker related to this First Amendment to Lease per a separate agreement.  

6. OFAC.  Tenant and Landlord are currently (a) in compliance with and shall at all times during the Term of the Lease remain in 

compliance with the regulations of the Office of Foreign Assets Control (“OFAC”) of the U.S. Department of Treasury and any statute, 
executive order, or regulation relating thereto (collectively, the “OFAC Rules”), (b) not listed on, and shall not during the Term of the Lease be 
listed on, the Specially Designated Nationals and Blocked Persons List, Foreign Sanctions Evaders List, or the Sectoral Sanctions 
Identification List, which are all maintained by OFAC and/or on any other similar list maintained by OFAC or other governmental authority 
pursuant to any authorizing statute, executive order, or regulation, and (c) not a person or entity with whom a U.S. person is prohibited from 
conducting business under the OFAC Rules.

7. Effective Date.  The parties agree that this Amendment shall be effective from and after the Effective Date and not to any period 

of time prior thereto.  To the extent this Amendment contains 

3

 
 
 
 
 
 
language which purports to amend the Lease with respect to periods of time prior to the Effective Date, such language is for clarification 
purposes only and shall not be deemed to change the obligations of the parties with respect thereto.  In no event shall this Amendment be 
construed to impose any liability on Landlord for any period of time preceding its ownership of the Property.

8. Ratification of Lease Provisions.  Except as otherwise expressly amended, modified and provided for in this Amendment, Tenant 

hereby ratifies all of the provisions, covenants and conditions of the Lease, and such provisions, covenants and conditions shall be deemed 
to be incorporated herein and made a part hereof and shall continue in full force and effect.

9. Entire Amendment.  This Amendment contains all the agreements of the parties with respect to the subject matter hereof and 

supersedes all prior dealings between the parties with respect to such subject matter.

10.Binding Amendment.  This Amendment shall be binding upon, and shall inure to the benefit of, the parties hereto, and their 

respective successors and assigns.

11.Governing Law.  This Amendment shall be governed by the laws of the Commonwealth of Massachusetts.

12.Authority.  Landlord and Tenant each warrants to the other that the person or persons executing this Amendment on its behalf 

has or have authority to do so and that such execution has fully obligated and bound such party to all terms and provisions of this 
Amendment.

13.Severability.  If any clause or provision of this Amendment is or should ever be held to be illegal, invalid or unenforceable under 

any present or future law applicable to the terms hereof, then and in that event, it is the intention of the parties hereto that the remainder of 
this Amendment shall not be affected thereby, and that in lieu of each such clause or provision of this Amendment that is illegal, invalid or 
unenforceable, such clause or provision shall be judicially construed and interpreted to be as similar in substance and content to such illegal, 
invalid or unenforceable clause or provision, as the context thereof would reasonably suggest, so as to thereafter be legal, valid and 
enforceable.

14.No Reservation.  Submission of this Amendment for examination or signature is without prejudice and does not constitute a 

reservation, option or offer, and this Amendment shall not be effective until execution and delivery by all parties.

15.Counterparts.  This Amendment may be executed simultaneously in two or more counterparts, each of which shall be deemed 
an original, but all of which together shall constitute one and the same instrument.  Additionally, e-mailed signatures may be used in place of 
original signatures on this Amendment.  Landlord and Tenant intend to be bound by the signatures on the e-mailed document, are aware that 
the other party will rely on the e-mailed signatures, and hereby waive any defenses to the enforcement of the terms of this Amendment 
based on the form of signature.

[SIGNATURES ON FOLLOWING PAGE]

4

 
 
 
 
IN WITNESS WHEREOF, Landlord and Tenant have executed this Amendment as of the day and year first written above.

LANDLORD:

XENON PROPERTY, LLC, a Delaware limited liability company

By:    ALP TPG II Manager, LLC, a Massachusetts limited liability company, its appointed 

representative

By:   _/s/ Brian Chaisson_ 
Name: 
Title: 

_Brian Chaisson___ 
Authorized Signatory

_____________

_____________

TENANT:

STOKE THERAPEUTICS, INC., a Delaware corporation

By:   _/s/ Edward M. Kaye______________
Name:  Edward M. Kaye
Title: 

Chief Executive Officer

By:   _/s/ Huw M. Nash________________
Name:  Huw M. Nash
COO & CBO
Title: 

5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT A

Extension Option

Tenant  shall  have  one  (1)  option  (the  “Extension  Option”)  to  extend  the  Term  for  one  (1)  extension  term  of  five  (5)  years 
commencing at the expiration of the Additional Base Term (the “Extension Term”).  Any extension of the Term for the Extension Term shall be 
applicable  to  the  entire  Premises.    If  Tenant  fails  timely  to  exercise  the  Extension  Option,  Tenant  shall  have  no  further  extension  rights 
hereunder.    If  Tenant  timely  exercises  the  Extension  Option  as  provided  below,  the  Term  shall  be  extended  for  the  Extension  Term,  and 
Tenant  shall  pay  Base  Rent  for  the  Premises  during  the  Extension  Term,  in  accordance  with  the  terms  and  conditions  of  Section  3  of  the 
Lease,  at  a  Base  Rent  rate  equal  to  95%  of  the  Fair  Market  Rent  Rate  (as  defined  below)  for  the  Premises  for  the  Extension  Term  as 
determined in accordance with the provisions of this Section set forth below.  Time is of the essence with respect to Tenant’s timely exercise 
of the Extension Option as provided herein.  Any notice exercising the Extension Option must be unconditional and irrevocable in order to be 
effective.  Except as set forth herein, Tenant’s lease of the Premises during the Extension Term shall be on all of the terms and conditions in 
effect for the Premises immediately prior to such extension, except that Tenant shall have no further option to extend the Term after the end 
of the Extension Term.  

The procedures for Tenant to exercise the Extension Option, and for the Extension Rent Rate (as defined below) applicable to the 

Extension Term to be determined, are as follows:

Tenant’s  Exercise  Notice.    If  Tenant  wishes  to  exercise  the  Extension  Option,  Tenant  shall  so  notify 
Landlord  no  less  than  nine  (9)  months,  prior  to  the  date  the  Additional  Base  Term  is  scheduled  to  expire.    Failure  by  Tenant 
timely to send a notice under this subparagraph (a) shall constitute an irrevocable waiver of Tenant’s right to extend the Term. 

(a)

(b)

Landlord’s Response.    If  Tenant  timely  delivers  a  notice  under  subparagraph  (a)  above,  Landlord  shall 
furnish Tenant with Landlord’s estimate of the Base Rent rate equal to 95% of the Fair Market Rent Rate for the Premises for the 
Extension Term (once determined pursuant to the terms and provisions set forth below, the “Extension Rent Rate”) no later than 
thirty (30) days following Landlord’s receipt of such notice.  Within thirty (30) days after Landlord furnishes its estimate of the 
Extension Rent Rate to Tenant under the preceding sentence, Tenant shall, by written notice delivered to Landlord, either (i) give 
Landlord  notice  accepting  Landlord’s  estimate  of  the  Extension  Rent  Rate  for  the  applicable  Extension  Term,  or  (ii)  give 
Landlord notice disputing Landlord’s estimate of such applicable Extension Rent Rate, which notice under clause (ii) shall state 
Tenant’s estimate of such applicable Extension Rent Rate.  Failure timely to give a notice disputing Landlord’s estimate of such 
applicable  Extension  Rent  Rate  shall  constitute  an  acceptance  of  Landlord’s  determination  of  such  applicable  Extension  Rent 
Rate.      

(c) Arbitration.  If Tenant disputes Landlord’s determination of the Extension Rent Rate under subparagraph 
(b)(ii)  above,  the  parties  shall  use  good  faith  efforts  to  resolve  such  dispute  for  a  period  of  thirty  (30)  days  after  such  dispute 
notice is delivered.  If, after such thirty (30) day period, the dispute over such Extension Rent Rate is not resolved, then either 
party may cause the matter of the Fair Market Rent Rate to be submitted to arbitration as set forth below, by giving notice of such 
submission to the other party.  Each of Landlord and Tenant, within twenty 

6

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(20) days after notice of such submission to arbitration, shall appoint as an arbitrator a commercial real estate broker with at least 
ten  (10)  years’  experience  as  a  broker  for  lab  space  in  the  Greater  Boston  Suburban  lab  markets,  including  Bedford, 
Massachusetts,  and  shall  give  notice  of  such  appointment  to  the  other  party.    If  either  Landlord  or  Tenant  shall  fail  timely  to 
appoint  an  arbitrator,  the  other  may  apply  to  the  Boston  Office  of  the  American  Arbitration  Association  (“AAA”)  for 
appointment of such an arbitrator five (5) Business Days after notice of such failure to the delinquent party if such arbitrator has 
not  then  been  appointed.    The  two  arbitrators  shall,  within  five  (5)  Business  Days  after  appointment  of  the  second  arbitrator, 
appoint a third arbitrator who shall be similarly qualified.  If the two arbitrators are unable to agree timely on the selection of the 
third arbitrator, then either arbitrator on behalf of both may request such appointment from the Boston office of the AAA.  The 
arbitration  shall  be  conducted  in  accordance  with  the  commercial  arbitration  rules  of  the  AAA  insofar  as  such  rules  are  not 
inconsistent with the provisions of this Lease (in which case the provisions of this Lease shall govern).  The arbitrators shall be 
charged to reach a majority written decision in accordance with the standards for Fair Market Rent Rate, within thirty (30) days 
after  the  third  arbitrator  is  appointed;  provided  however,  (i)  the  arbitrators  shall  not  establish  a  Fair  Market  Rent  Rate  that  is 
higher than the Extension Rent Rate proposed by Landlord or lower than Tenant’s counterproposal to Landlord’s Extension Rent 
Rate offered by Tenant prior to the initiation of arbitration, and (ii) if the arbitrators are unable to reach such a majority decision, 
subject  to  the  preceding  subsection  1(c)(i),  the  Fair  Market  Rent  Rate  shall  be  deemed  to  be  the  average  of  the  two  closest 
determinations made and simultaneously issued by the three arbitrators.  The arbitrators shall have no authority or jurisdiction to 
make any other determination of such amount.  Each party shall bear the costs of its appointed arbitrator; otherwise, the cost of 
the arbitration (exclusive of each party’s witness and attorneys’ fees, which shall be paid by such party) shall be borne equally by 
the parties.  If the AAA shall cease to provide arbitration for commercial disputes in Boston, the second or third arbitrator, as the 
case may be, shall be appointed by any successor organization providing substantially the same services, and in the absence of 
such an organization, by a court of competent jurisdiction under the arbitration act of The Commonwealth of Massachusetts.  For 
any period during which the applicable Extension Rent Rate is in dispute hereunder, Tenant shall make payment on account of 
the applicable Extension Rent Rate at the rate in place in the final year of the Additional Base Term, and the parties shall adjust 
for overpayments or underpayments within thirty (30) days after the decision of the arbitrators is announced.

(d)

Fair Market Rent Rate.  The “Fair Market Rent Rate” for the Extension Term shall mean the annual fair 
market rent per square foot for the Premises for a term coterminous with the applicable Extension Term under the terms of this 
Lease,  as  though  the  Premises  were  in  the  condition  then  existing  or  in  such  better  condition  as  such  space  is  required  to  be 
maintained hereunder.  In making such determination, reference shall be made to lease transactions for comparable lab space in 
comparable  lab  buildings  in  Bedford,  Massachusetts,  and  appropriate  adjustments  to  the  rent  rates  in  such  comparable 
transactions shall be made for any relevant factors, including, without limitation, the timing of the transaction, the location and 
condition of the space, the quality of the Building, and any free rent, tenant improvements or other tenant concessions (or the lack 
thereof). 

7

 
 
 
 
 
 
 
 
 
 
 
 
 
(e)

Confirmatory Instrument.  If Tenant shall exercise the Extension Option in accordance with this Section, 
the provisions of this Section shall be self-operative, but upon request by either party after determination of the Extension Rent 
Rate for the Extension Term, the parties shall execute an agreement specifying the Extension Rent Rate for the Extension Term 
and acknowledging the extension of the Term.

(f)

General.    Notwithstanding  any  provision  of  this  Section  to  the  contrary,  the  Extension  Option  shall  be 
void, at Landlord’s election, if (i) Tenant is in default under the Lease, after any applicable notice and cure periods have expired, 
at the time Tenant elects to extend the Term or at the time the Term would expire but for such extension, or (ii) at the time of 
Tenant’s exercise of the Extension Option more than fifty percent (50%) of the Premises is subleased (other than pursuant to a 
Permitted Transfer), or an assignment of the Lease (other than in connection with a Permitted Transfer) is then in full force and 
effect.

  DOCPROPERTY "CUS_DocIDChunk0" 6185347.10

8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-232191, 333-237345, 333-254499, 333-263531, 333-
270744, and 333-271237) on Form S-8 and (No. 333-265107) on Form S-3 of our report dated March 25, 2024, with respect to the 
consolidated financial statements of Stoke Therapeutics, Inc..

/s/ KPMG LLP

Exhibit 23.1

Boston, Massachusetts
March 25, 2024

 
 
CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF
THE SECURITIES EXCHANGE ACT OF 1934, 
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 31.1

I, Edward M. Kaye, certify that:

1.

I have reviewed this Form 10-K of Stoke Therapeutics, Inc.; 

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the 
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this 
report; 

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the 

financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4.

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in 
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have: 

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to 
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those 
entities, particularly during the period in which this report is being prepared; 

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our 
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for 
external purposes in accordance with generally accepted accounting principles;

c.

Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the 
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent 
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to 
materially affect, the registrant’s internal control over financial reporting; and

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the 
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions): 

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably 

likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control 

over financial reporting. 

Date: March 25, 2024

/s/ Edward M. Kaye, M.D.
Edward M. Kaye, M.D.
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF
THE SECURITIES EXCHANGE ACT OF 1934, 
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 31.2

I, Stephen J. Tulipano, certify that:

1.

I have reviewed this Form 10-K of Stoke Therapeutics, Inc.; 

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the 
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this 
report; 

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the 

financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4.

The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in 
Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-
15(f)) for the registrant and have:  

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to 
ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those 
entities, particularly during the period in which this report is being prepared; 

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our 
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for 
external purposes in accordance with generally accepted accounting principles;

c.

Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the 
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent 
fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to 
materially affect, the registrant’s internal control over financial reporting; and

5.

The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the 
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions): 

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably 

likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and 

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control 

over financial reporting.

Date: March 25, 2024

/s/ Stephen J. Tulipano, CPA
Stephen J. Tulipano, CPA
Chief Financial Officer
(Principal Financial Officer and Principal 
Accounting Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

I, Edward M. Kaye, Chief Executive Officer of Stoke Therapeutics, Inc. (the “Company”), do hereby certify, pursuant to 18 U.S.C. Section 1350, as 
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1.

2.

the Annual Report on Form 10-K of the Company for the year ended December 31, 2023 (the “Report”) fully complies with the requirements of 
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 25, 2024

By:

/s/ Edward M. Kaye, M.D. 
Edward M. Kaye, M.D. 
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.2

I, Stephen J. Tulipano, Chief Financial Officer of Stoke Therapeutics, Inc. (the “Company”), do hereby certify, pursuant to 18 U.S.C. Section 1350, as 
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1.

2.

the Annual Report on Form 10-K of the Company for the year ended December 31, 2023 (the “Report”) fully complies with the requirements of 
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 25, 2024

By:

/s/ Stephen J. Tulipano, CPA
Stephen J. Tulipano
Chief Financial Officer
(Principal Financial Officer and Principal Accounting
Officer)

 
 
 
 
 
 
 
 
STOKE THERAPEUTICS, INC.

COMPENSATION RECOVERY POLICY

Exhibit 97

(Adopted September 19, 2023)

The Board has determined that it is in the best interests of the Company and its stockholders to adopt this Policy enabling the 
Company to recover from specified current and former Company executives certain incentive-based compensation in the event of 
an  accounting  restatement  resulting  from  material  noncompliance  with  any  financial  reporting  requirements  under  the  federal 
securities laws.  Capitalized terms are defined in Section 14.

This Policy is designed to comply with Rule 10D-1 of the Exchange Act and shall become effective on the Effective Date and 
shall apply to Incentive-Based Compensation Received by Covered Persons on or after the Listing Rule Effective Date. 

1.

Administration

This Policy shall be administered by the Administrator.  The Administrator is authorized to interpret and construe this Policy and 
to  make  all  determinations  necessary,  appropriate,  or  advisable  for  the  administration  of  this  Policy.    The  Administrator  may 
retain, at the Company’s expense, outside legal counsel and such compensation, tax or other consultants as it may determine are 
advisable for purposes of administering this Policy.  

2.

Covered Persons and Applicable Compensation 

This Policy applies to any Incentive-Based Compensation Received by a person (a) after beginning service as a Covered Person; 
(b) who served as a Covered Person at any time during the performance period for that Incentive-Based Compensation; and (c) 
was a Covered Person during the Clawback Period.  

However, recovery is not required with respect to:

i.

Incentive-Based  Compensation  Received  prior  to  an  individual  becoming  a  Covered  Person,  even  if  the  individual 
served as a Covered Person during the Clawback Period.  

ii.

Incentive-Based Compensation Received prior to the Listing Rule Effective Date. 

iii. Incentive-Based Compensation Received prior to the Clawback Period.

iv.

Incentive-Based  Compensation  Received  while  the  Company  did  not  have  a  class  of  listed  securities  on  a  national 
securities exchange or a national securities association, including the Exchange. 

The  Administrator  will  not  consider  the  Covered  Person’s  responsibility  or  fault  or  lack  thereof  in  enforcing  this  Policy  with 
respect to recoupment under the Final Rules.  

 
 
 
 
3.

Triggering Event

Subject to and in accordance with the provisions of this Policy, if there is a Triggering Event, the Administrator shall require a 
Covered  Person  to  reimburse  or  forfeit  to  the  Company  the  Recoupment  Amount  applicable  to  such  Covered  Person.    A 
Company’s obligation to recover the Recoupment Amount is not dependent on if or when the restated financial statements are
filed. 

4.

Calculation of Recoupment Amount 

The  Recoupment  Amount  will  be  calculated  in  accordance  with  the  Final  Rules,  as  provided  in  the  Calculation  Guidelines
attached hereto as Exhibit B.

5.

Method of Recoupment

Subject  to  compliance  with  the  Final  Rules  and  applicable  law,  the  Administrator  will  determine,  in  its  sole  discretion,  the 
method for recouping the Recoupment Amount hereunder which may include, without limitation:

i. Requiring reimbursement or forfeiture of the pre-tax amount of cash Incentive-Based Compensation previously paid;

ii. Offsetting  the  Recoupment  Amount  from  any  compensation  otherwise  owed  by  the  Company  to  the  Covered  Person, 
including without limitation, any prior cash incentive payments, executive retirement benefits, wages, equity grants or 
other amounts payable by the Company to the Covered Person in the future;

iii. Seeking recovery of any gain realized on the vesting, exercise, settlement, cash sale, transfer, or other disposition of any 

equity-based awards; and/or

iv. Taking any other remedial and recovery action permitted by law, as determined by the Administrator.

6.

Recovery Process; Impracticability

Actions by the Administrator to recover the Recoupment Amount will be reasonably prompt. 

The Administrator must cause the Company to recover the Recoupment Amount unless the Administrator shall have previously 
determined that recovery is impracticable and one of the following conditions is met:

i.

The direct expense paid to a third party to assist in enforcing this Policy would exceed the amount to be recovered; 
before  concluding  that  it  would  be  impracticable  to  recover  any  amount  of  erroneously  awarded  Incentive-Based 
Compensation based on expense of enforcement, the Company must make a reasonable attempt to recover such 

2

 
 
 
 
 
 
 
erroneously awarded Incentive-Based Compensation, document such reasonable attempt(s) to recover, and provide 
that documentation to the Exchange;

Recovery  would  violate  home  country  law  where  that  law  was  adopted  prior  to  November  28,  2022;  before 
concluding  that  it  would  be  impracticable  to  recover  any  amount  of  erroneously  awarded  Incentive-Based 
Compensation  based  on  violation  of  home  country  law,  the  Company  must  obtain  an  opinion  of  home  country 
counsel, acceptable to the Exchange, that recovery would result in such a violation, and must provide such opinion 
to the Exchange; or 

Recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available 
to  employees  of  the  Company,  to  fail  to  meet  the  requirements  of  26  U.S.C.  401(a)(13)  or  26  U.S.C.  411(a)  and 
regulations thereunder.  

ii.

iii.

7.

Non-Exclusivity

The Administrator intends that this Policy will be applied to the fullest extent of the law.  Without limitation to any broader or 
alternate  clawback  authorized  in  any  written  document  with  a  Covered  Person,  (i)  the  Administrator  may  require  that  any 
employment  agreement,  equity  award  agreement,  or  similar  agreement  entered  into  on  or  after  the  Effective  Date  shall,  as  a 
condition to the grant of any benefit thereunder, require a Covered Person to agree to abide by the terms of this Policy, and (ii) 
this Policy will nonetheless apply to Incentive-Based Compensation as required by the Final Rules, whether or not specifically 
referenced  in  those  arrangements.    Any  right  of  recoupment  under  this  Policy  is  in  addition  to,  and  not  in  lieu  of,  any  other 
remedies  or  rights  of  recoupment  that  may  be  available  to  the  Company  pursuant  to  the  terms  of  any  similar  policy  in  any 
employment agreement, equity award agreement, or similar agreement and any other legal remedies or regulations available or 
applicable  to  the  Company  (including  SOX  304).    If  recovery  is  required  under  both  SOX  304  and  this  Policy,  any  amounts 
recovered pursuant to SOX 304 may be credited toward the amount recovered under this Policy, or vice versa. 

8.

No Indemnification

The  Company  shall  not  indemnify  any  Covered  Persons  against  (i)  the  loss  of  erroneously  awarded  Incentive-Based 
Compensation or any adverse tax consequences associated with any incorrectly awarded Incentive-Based Compensation or any 
recoupment hereunder, or (ii) any claims relating to the Company enforcement of its rights under this Policy.  For the avoidance 
of  doubt,  this  prohibition  on  indemnification  will  also  prohibit  the  Company  from  reimbursing  or  paying  any  premium  or 
payment of any third-party insurance policy to fund potential recovery obligations obtained by the Covered Person directly.  No 
Covered Person will seek or retain any such prohibited indemnification or reimbursement.

3

 
 
 
 
 
 
Further, the Company shall not enter into any agreement that exempts any Incentive-Based Compensation from the application of 
this Policy or that waives the Company’s right to recovery of any erroneously awarded Incentive-Based Compensation and this 
Policy shall supersede any such agreement (whether entered into before, on or after the Effective Date).

9.

Covered Person Acknowledgement and Agreement

All Covered Persons subject to this Policy must acknowledge their understanding of, and agreement to comply with, the Policy 
by executing the certification attached hereto as Exhibit A.  Notwithstanding the foregoing, this Policy will apply to Covered 
Persons whether or not they execute such certification.

10.

Successors

This Policy shall be binding and enforceable against all Covered Persons and their beneficiaries, heirs, executors, administrators 
or other legal representatives and shall inure to the benefit of any successor to the Company.  

11.

Governing Law; Interpretation of Policy

This Policy will be governed by and construed in accordance with the laws of the State of Delaware (excluding its conflict of 
laws rules).

To the extent there is any ambiguity between this Policy and the Final Rules, this Policy shall be interpreted so that it complies 
with the Final Rules.  If any provision of this Policy, or the application of such provision to any Covered Person or circumstance, 
shall be held invalid, the remainder of this Policy, or the application of such provision to Covered Persons or circumstances other 
than those as to which it is held invalid, shall not be affected thereby. 

In the event any provision of this Policy is inconsistent with any requirement of any Final Rules, the Administrator, in its sole 
discretion, shall amend and administer this Policy and bring it into compliance with such rules.  

Any  determination  under  this  Policy  by  the  Administrator  shall  be  conclusive  and  binding  on  the  applicable  Covered  Person.  
Determinations  of  the  Administrator  need  not  be  uniform  with  respect  to  Covered  Persons  or  from  one  payment  or  grant  to 
another.  

12.

Amendments; Termination 

The  Administrator  may  make  any  amendments  to  this  Policy  as  required  under  applicable  law,  rules  and  regulations,  or  as 
otherwise determined by the Administrator in its sole discretion.

The Administrator may terminate this Policy at any time.  

4

 
 
 
13.

Definitions

“Administrator” means the Compensation Committee of the Board, or in the absence of a committee of independent directors 
responsible for executive compensation decisions, a majority of the independent directors serving on the Board. 

“Board” means the Board of Directors of the Company.

“Clawback Measurement Date” is the earlier to occur of: 

i. The date the Board, a committee of the Board, or the officer or officers of the Company authorized to take such action if 
Board action is not required, concludes, or reasonably should have concluded, that the Company is required to prepare 
an accounting restatement as described in this Policy; or

ii. The date a court, regulator, or other legally authorized body directs the Company to prepare an accounting restatement as 

described in this Policy.

“Clawback Period” means the three (3) completed fiscal years immediately prior to the Clawback Measurement Date and any 
transition period between the last day of the Company’s previous fiscal year end and the first day of its new fiscal year  (that 
results from a change in the Company’s fiscal year) within or immediately following such three (3)-year period; provided that 
any transition period between the last day of the Company’s previous fiscal year end and the first day of its new fiscal year that 
comprises a period of 9 to 12 months will be deemed a completed fiscal year. 

“Company” means Stoke Therapeutics, a Delaware corporation, or any successor corporation.

“Covered Person” means any Executive Officer (as defined in the Final Rules), including, but not limited to, those persons who 
are  or  have  been  determined  to  be  “officers”  of  the  Company  within  the  meaning  of  Section  16  of  Rule  16a‑1(f)  of  the  rules 
promulgated under the Exchange Act, and “executive officers” of the Company within the meaning of Item 401(b) of Regulation 
S-K, Rule 3b‑7 promulgated under the Exchange Act, and Rule 405 promulgated under the Securities Act of 1933, as amended; 
provided that the Administrator may identify additional employees who shall be treated as Covered Persons for the purposes of 
this Policy with prospective effect, in accordance with the Final Rules.

“Effective Date” means September 19, 2023, the date the Policy was adopted by the Board.

“Exchange” means the Nasdaq Global Select Market or any other national securities exchange or national securities association 
in the United States on which the Company has listed its securities for trading.  

“Exchange Act” means the Securities Exchange Act of 1934, as amended.

“Final  Rules”  means  the  final  rules  promulgated  by  the  SEC  under  Section  954  of  the  Dodd-Frank  Act,  Rule  10D-1  and 
Exchange listing standards, as may be amended from time to time.

5

 
 
 
 
“Financial Reporting Measure”  are  measures  that  are  determined  and  presented  in  accordance  with  the  accounting  principles 
used in preparing the Company’s financial statements, and any measures that are derived wholly or in part from such measures. 
Stock  price  and  TSR  are  also  financial  reporting  measures.  A  financial  reporting  measure  need  not  be  presented  within  the 
financial statements or included in a filing with the SEC. 

“Incentive-Based Compensation” means compensation that is granted, earned or vested based wholly or in part on the attainment 
of any Financial Reporting Measure. Examples of “Incentive-Based Compensation” include, but are not limited to: non-equity 
incentive  plan  awards  that  are  earned  based  wholly  or  in  part  on  satisfying  a  Financial  Reporting  Measure  performance  goal; 
bonuses paid from a “bonus pool,” the size of which is determined based wholly or in part on satisfying a Financial Reporting 
Measure  performance  goal;  other  cash  awards  based  on  satisfaction  of  a  Financial  Reporting  Measure  performance  goal; 
restricted stock, restricted stock units, performance share units, stock options, and SARs that are granted or become vested based 
wholly  or  in  part  on  satisfying  a  Financial  Reporting  Measure  goal;  and  proceeds  received  upon  the  sale  of  shares  acquired 
through an incentive plan that were granted or vested based wholly or in part on satisfying a Financial Reporting Measure goal. 
“Incentive-Based Compensation” excludes, for example, time-based awards such as stock options or restricted stock units that are 
granted or vest solely upon completion of a service period; awards based on non-financial strategic or operating metrics such as 
the  consummation  of  a  merger  or  achievement  of  non-financial  business  goals;  service-based  retention  bonuses;  discretionary 
compensation; and salary.

“Listing  Rule  Effective  Date”  means  the  effective  date  of  the  listing  standards  of  the  Exchange  on  which  the  Company’s 
securities are listed.

“Policy” means this Compensation Recovery Policy. 

Incentive-Based  Compensation  is  deemed  “Received”  in  the  Company’s  fiscal  period  during  which  the  relevant  Financial 
Reporting  Measure  specified  in  the  Incentive-Based  Compensation  award  is  attained,  irrespective  of  whether  the  payment  or 
grant occurs on a later date or if there are additional vesting or payment requirements, such as time-based vesting or certification 
or approval by the Compensation Committee or Board, that have not yet been satisfied.

“Recoupment  Amount”  means  the  amount  of  Incentive-Based  Compensation  Received  by  the  Covered  Person  based  on  the 
financial  statements  prior  to  the  restatement  that  exceeds  the  amount  such  Covered  Person  would  have  received  had  the 
Incentive-Based Compensation been determined based on the financial restatement, computed without regard to any taxes paid 
(i.e., gross of taxes withheld).

“SARs” means stock appreciation rights.

“SEC” means the U.S. Securities and Exchange Commission.

“SOX 304” means Section 304 of the Sarbanes-Oxley Act of 2002.

“Triggering Event” means any event in which the Company is required to prepare an accounting restatement due to the material 
noncompliance  of  the  Company  with  any  financial  reporting  requirement  under  the  securities  laws,  including  any  required 
accounting restatement to correct an 

6

 
 
 
error in previously issued financial statements that is material to the previously issued financial statements, or that would result in 
a material misstatement if the error were corrected in the current period or left uncorrected in the current period.  

“TSR” means total stockholder return.

7

 
 
 
 
EXHIBIT A

Certification

I certify that:

1.

2.

3.

4.

I have read and understand the Company’s Compensation Recovery Policy (the “Policy”).  I understand that the Company is 
available to answer any questions I have regarding the Policy.

I  understand  that  the  Policy  applies  to  all  of  my  existing  and  future  compensation-related  agreements  with  the  Company, 
whether or not explicitly stated therein. 

I  agree  that  notwithstanding  the  Company’s  certificate  of  incorporation,  bylaws,  and  any  agreement  I  have  with  the 
Company,  including  any  indemnity  agreement  I  have  with  the  Company,  I  will  not  be  entitled  to,  and  will  not  seek 
indemnification  from  the  Company  for,  any  amounts  recovered  or  recoverable  by  the  Company  in  accordance  with  the 
Policy.

I understand and agree that in the event of a conflict between the Policy and the foregoing agreements and understandings on 
the one hand, and any prior, existing or future agreement, arrangement or understanding, whether oral or written, with respect 
to the subject matter of the Policy and this Certification, on the other hand, the terms of the Policy and this Certification shall 
control, and the terms of this Certification shall supersede any provision of such an agreement, arrangement or understanding 
to the extent of such conflict with respect to the subject matter of the Policy and this Certification.

5.

I agree to abide by the terms of the Policy, including, without limitation, by returning any erroneously awarded Incentive-
Based Compensation to the Company to the extent required by, and in a manner permitted by, the Policy.

Signature:  

Name:  

Title:  

Date:  

8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT B

Calculation Guidelines

For purposes of calculating the Recoupment Amount: 

i.

For  cash  awards  not  paid  from  bonus  pools,  the  erroneously  awarded  compensation  is  the  difference  between  the 
amount  of  the  cash  award  (whether  payable  as  a  lump  sum  or  over  time)  that  was  received  and  the  amount  that 
should have been received applying the restated Financial Reporting Measure. 

ii. For  cash  awards  paid  from  bonus  pools,  the  erroneously  awarded  compensation  is  the  pro  rata  portion  of  any
deficiency  that  results  from  the  aggregate  bonus  pool  that  is  reduced  based  on  applying  the  restated  Financial 
Reporting Measure. 

iii. For equity awards, if the shares, options, restricted stock units, or SARs are still held at the time of recovery, the 
erroneously  awarded  compensation  is  the  number  of  such  securities  received  in  excess  of  the  number  that  should 
have been received applying the restated Financial Reporting Measure (or the value of that excess number).  If the 
options  or  SARs  have  been  exercised,  but  the  underlying  shares  have  not  been  sold,  the  erroneously  awarded 
compensation  is  the  number  of  shares  underlying  the  excess  options  or  SARs  (or  the  value  thereof).    If  the 
underlying shares have been sold, the Company may recoup proceeds received from the sale of shares.

iv. For  Incentive-Based  Compensation  based  on  stock  price  or  TSR,  where  the  amount  of  erroneously  awarded 
compensation  is  not  subject  to  mathematical  recalculation  directly  from  the  information  in  an  accounting 
restatement:

a. The  amount  must  be  based  on  a  reasonable  estimate  of  the  effect  of  the  accounting  restatement  on  the  stock 

price or TSR upon which the Incentive-Based Compensation was Received; and

b. The Company must maintain documentation of the determination of that reasonable estimate and the Company 

must provide such documentation to the Exchange in all cases.

9