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Dianthus Therapeutics, Inc. /DE/Health Care · Pharmaceutical Preparations · CIK 1690585 · FY ends Dec 31
$113.70
-1.84 (-1.59%)
USD · as of 2026-08-19 · marketstack

DNTH · 10-K · period ended 2022-12-31

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filed 2023-03-23 · EDGAR original ↗

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10-K

Table of Contents

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, 2022

OR

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

For the transition period fromto.

Commission file number: 001-38541

Magenta Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

100 Technology SquareCambridge, Massachusetts 02139

(Address of principal executive offices) (Zip Code)

(857) 242-0170

(Registrant’s telephone number, including area code)

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

Title of each class TradingSymbol(s) Name of each exchangeon which registered

Common Stock, $0.001 Par Value MGTA The Nasdaq Global Market

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

None

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

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

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

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

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

Large accelerated filer ☐ Accelerated filer ☐

Non-accelerated filer ☒ Smaller reporting company ☒

Emerging growth company ☒

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

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

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

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

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The aggregate market value of Common Stock held by non-affiliates of the registrant computed by reference to the price of the registrant’s Common Stock as of June 30, 2022, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $56.3 million (based on the last reported sale price on the Nasdaq Global Market as of such date). For this computation, the registrant has excluded the market value of all shares of Common Stock reported as beneficially owned by its executive officer and directors; such exclusion shall not be deemed to constitute an admission that any such person is an affiliate of the registrant.

As of January 31, 2023, there were 60,639,909 shares of the registrant’s Common Stock, $0.001 par value per share, outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for its 2023 Annual Meeting of Stockholders, which the registrant intends to file with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year ended December 31, 2022, are incorporated by reference into Part III of this Annual Report on Form 10-K.

Table of Contents

Magenta Therapeutics, Inc.

Index

Page

PART I

Item 1. Business 7

Item 1A. Risk Factors 36

Item 1B. Unresolved Staff Comments 86

Item 2. Properties 86

Item 3. Legal Proceedings 86

Item 4. Mine Safety Disclosures 86

PART II

Item 6. Reserved 87

Item 7A. Quantitative and Qualitative Disclosures About Market Risk 97

Item 8. Financial Statements and Supplementary Data 98

Item 9A. Controls and Procedures 119

Item 9B. Other Information 119

PART III

Item 10. Directors, Executive Officers and Corporate Governance 120

Item 11. Executive Compensation 120

Item 14. Principal Accounting Fees and Services 120

PART IV

Item 15. Exhibits, Financial Statement Schedules 121

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FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K of Magenta Therapeutics, Inc., or the Company, contains or incorporates statements that constitute forward-looking statements within the meaning of the federal securities laws. Any express or implied statements that do not relate to historical or current facts or matters are forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “could,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “projects,” “seeks,” “target,” “endeavor,” “potential,” “continue” or the negative of these terms or other comparable terminology. Forward-looking statements appear in a number of places in this Annual Report on Form 10-K and include, but are not limited to, statements about:

our plans and expectations regarding our strategic alternative review process and the timing and success of such process regarding a potential transaction;

timing of and costs or charges associated with our restructurings, and the savings benefits we expect to receive from those restructurings;

success in retaining, or changes required in, our officers, key employees or directors;

our public securities’ potential liquidity and trading;

the initiation, timing and success of clinical trials for our product candidates;

regulatory actions with respect to our product candidates or our competitors’ products and product candidates;

the outcomes of our preclinical studies;

our ability to manufacture our product candidates in conformity with the FDA’s requirements and to scale up manufacturing of our product candidates to commercial scale, if approved;

whether the results of our trials will be sufficient to support domestic or foreign regulatory approvals for our product candidates;

our reliance on third parties to conduct our clinical trials;

our reliance on third-party contract development and manufacturer organizations to manufacture and supply our product candidates for us;

our ability to establish clinical programs moving forward in multiple indications, with a rapidly advancing portfolio and sustainable platform;

our ability to obtain, including on an expedited basis, and maintain regulatory approval of our product candidates;

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

the benefits of the use of our product candidates, if approved;

our ability to successfully commercialize our product candidates, if approved;

the rate and degree of market acceptance of our product candidates;

our expectations regarding government and third-party payor coverage and reimbursement;

our ability to obtain and maintain intellectual property protection for our product candidates;

our ability to obtain orphan drug designation for any of our product candidates;

our ability to successfully build a specialty sales force and commercial infrastructure;

our ability to compete with companies currently producing or engaged in the clinical development of treatments for the disease indications that we may pursue and treatment modalities that we may develop;

our ability to successfully find collaborators for any of our current and future programs and product candidates;

our ability to retain and recruit key personnel;

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

our expectations regarding the time during which we will continue to be an emerging growth company or smaller reporting company as defined in federal securities regulations;

our financial performance; and

developments and projections relating to our competitors or our industry.

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Although we believe that the expectations reflected in these forward-looking statements are reasonable, these statements relate to our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans, objectives of management and expected market growth, and involve known and unknown risks, uncertainties and other factors, including without limitation, risks, uncertainties and assumptions regarding our plans and expectations regarding our strategic alternative review process and the timing and success of such process regarding a potential transaction, our ability to resume, conduct or successfully complete certain clinical trials, and our financial position, that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. You are urged to carefully review the disclosures we make concerning these risks and other factors that may affect our business and operating results under “Item 1A. Risk Factors” in this Annual Report on Form 10-K, as well as our other reports filed with the Securities and Exchange Commission, or the SEC. Any public statements or disclosures by us following this Annual Report on Form 10-K that modify or impact any of the forward-looking statements contained in this Annual Report on Form 10-K will be deemed to modify or supersede such statements in this Annual Report on Form 10-K. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this document. The Company does not intend, and undertakes no obligation, to update any forward-looking information to reflect events or circumstances after the date of this document or to reflect the occurrence of unanticipated events, unless required by law to do so.

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RISK FACTOR SUMMARY

The risk factors detailed in Item 1A entitled “Risk Factors” in this Annual Report on Form 10-K are the risks that we believe are material to our investors and a reader should carefully consider them. Those risks are not all of the risks we face and other factors not presently known to us or that we currently believe are immaterial may also affect our business if they occur. The following is a summary of the risk factors detailed in Item 1A:

We may not be successful in identifying and implementing any strategic transaction, and any strategic transactions that we may consummate in the future could have negative consequences. If a strategic transaction is not consummated, our board of directors may decide to pursue a dissolution and liquidation. In such an event, the amount of cash available for distribution to our stockholders will depend heavily on the timing of such liquidation as well as the amount of cash that will need to be reserved for commitments and contingent liabilities.

We are a biotechnology company with a limited operating history, have incurred significant losses since our inception and anticipate that we will continue to incur net losses for the foreseeable future. We have no products approved for commercial sale and have not generated any revenue from product sales.

Should we resume development of our product candidates, we will require additional capital to fund our operations, and if we fail to obtain necessary financing, we will not be able to complete the development and commercialization of our product candidates. Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.

We have not yet demonstrated an ability to successfully complete certain clinical trials of our product candidates, obtain marketing approvals, manufacture a commercial-scale medicine, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities necessary for successful commercialization of our product candidates. We have never generated revenue from product sales and may never be profitable.

Should we resume development of our product candidates, if we are unable to advance our product candidates through development, obtain regulatory approval and commercialize them, or if we experience significant delays in doing so, our business will be materially harmed.

The successful development of biopharmaceuticals and cell-based therapies is highly uncertain. Clinical trials or those of our collaborators involving our product candidates may reveal significant adverse events not seen in our preclinical and clinical studies and may result in a safety profile that could inhibit regulatory approval or market acceptance of any of our product candidates.

Stem cell transplant is a high-risk procedure with curative potential that may result in complications or adverse events for patients in our clinical trials or for patients that use any of our product candidates, if approved.

Should we resume development of our product candidates, if we are not able to identify a safe and effective dose for any of our product candidates, we may need to delay, abandon or limit our development of any potential product candidates.

Clinical development involves a lengthy and expensive process, with an uncertain outcome. Should we resume development of our product candidates, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of any product candidates. If we encounter delays or difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

Should we resume development of our product candidates, the results of earlier studies and interim data from our ongoing studies may not be predictive of future clinical trial results, and we may fail to establish an adequate safety or efficacy profile to conduct advanced clinical trials or obtain regulatory approval for our product candidates.

We have no experience as a company in obtaining regulatory approval for a drug or biologic. Even if we complete the necessary clinical trials, we cannot predict when, or if, we will obtain regulatory approval to commercialize a product candidate we may develop, and any such approval may be for a narrower indication than we seek.

Should we resume development of our product candidates, because we are developing product candidates for the treatment of diseases in which there is little clinical experience using new technologies, there is increased risk that the U.S. Food and Drug Administration, or FDA, the European Medicines Agency, or EMA, or other regulatory authorities may not consider the endpoints of our clinical trials to provide clinically meaningful results, and these results may be difficult to analyze.

Even if we complete the necessary clinical trials, we cannot predict when, or if, we will obtain regulatory approval to commercialize a product candidate we may develop, and any such approval may be for a narrower indication than we seek.

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We have been and may in the future be subject to many manufacturing risks, any of which could substantially increase our costs, delay clinical programs and limit supply of our product candidates.

We have in the past relied on and, should we resume development of our product candidates, may continue to rely on third parties to conduct our preclinical and clinical trials and we may rely on them to perform other tasks for us as well. If these third parties do not successfully carry out their contractual duties, meet expected deadlines or comply with regulatory requirements, we may not be able to obtain regulatory approval for or commercialize our product candidates and our business could be substantially harmed.

We may never obtain FDA approval for any of our product candidates in the U.S., and even if we do, we may never obtain approval for or commercialize any of our product candidates in any other jurisdiction, which would limit our ability to realize their full market potential.

Even if our product candidates are approved by government regulators, the commercial success of any of our product candidates will depend upon the degree of market acceptance by physicians, patients, third-party payors and others in the medical community. Coverage and reimbursement may be limited or unavailable in certain market segments for our product candidates, if approved, which could make it difficult for us to sell any product candidates or therapies profitably.

We currently have no marketing and sales organization and have no experience in marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, we may not be able to generate product revenue.

We face substantial competition, including from companies with greater financial, technical, research, manufacturing, marketing, distribution and other resources than us, which may result in others discovering, developing or commercializing products before or more successfully than we do.

Should we resume development of our product candidates, our commercial success depends on our ability to obtain, maintain and protect our intellectual property and proprietary technology. If we are unable to obtain and maintain sufficient intellectual property protection for our product candidates, or our technologies, we may not be able to compete effectively in our markets and our business may be adversely affected.

Should we resume development of our product candidates, we may depend on collaborations with third parties for the research, development, and commercialization of certain of the product candidates we may develop. If any such collaborations are not successful, we may not be able to capitalize on the market potential of those product candidates and our business may be adversely affected.

Should we resume development of our product candidates, we may not be successful in finding strategic collaborators for continuing development of certain of our product candidates or successfully commercializing or competing in the market for certain indications. If we are not able to establish collaborations on commercially reasonable terms, we may have to alter our development and commercialization plans.

Should we resume development of our product candidates, if we lose key personnel, or if we fail to recruit additional highly skilled personnel, our ability to develop our product candidates will be impaired and our business may be harmed.

The trading price of our common stock has been, and will likely continue to be, highly volatile. As a result of this volatility, investors may not be able to sell common stock at or above the purchase price and may lose some or all of their investment.

This section contains forward-looking statements. You should refer to the explanation of the qualifications and limitations on forward-looking statements in this Annual Report on Form 10-K.

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PART I

Except where the context otherwise requires or where otherwise indicated, the terms “Magenta,” “we,” “us,” “our,” “our company,” “the company,” and “our business” refer to Magenta Therapeutics, Inc. and its consolidated subsidiary.

ITEM 1. BUSINESS

Overview

Magenta Therapeutics, Inc. is a biotechnology company focused on improving stem cell transplantation.

In February 2023, after a review of Magenta’s programs, resources and capabilities, including anticipated costs and timelines, we announced the decision to halt further development of our programs. Specifically, we discontinued the MGTA-117 Phase 1/2 clinical trial in patients with relapsed/refractory acute myeloid leukemia, or R/R AML, and myelodysplastic syndromes, or MDS. We discontinued the MGTA-145 Phase 2 stem cell mobilization clinical trial in patients with sickle cell disease, or SCD. Lastly, we stopped incurring certain costs relating to MGTA-45, including manufacturing and costs relating to certain other activities that were intended to support an investigative new drug application, or IND, for MGTA-45 (previously named CD45-ADC). As a result of these decisions, we conducted a corporate restructuring that resulted in a reduction in our workforce by 84%.

Coinciding with the decisions related to the programs and across the portfolio, we announced that we intended to conduct a comprehensive review of strategic alternatives for the company and its assets. As part of our strategic review process, we are exploring potential strategic alternatives that include, without limitation, an acquisition, merger, business combination or other transaction. We are also exploring strategic transactions regarding our product candidates and related assets, including, without limitation, licensing transactions and asset sales. There can be no assurance that the strategic review process or any transaction relating to a specific asset, will result in Magenta pursuing such a transaction(s), or that any transaction(s), if pursued, will be completed on terms favorable to Magenta and its stockholders in the existing Magenta entity or any possible entity that results from a combination of entities. If the strategic review process is unsuccessful, our board of directors may decide to pursue a dissolution and liquidation of Magenta.

Our product candidates have been designed to improve the patient experience when preparing for stem cell transplant or gene therapy. Our MGTA-117 product candidate was designed as an antibody drug conjugate, or ADC, designed to deplete CD117-expressing stem cells in the bone marrow in order to make room for subsequently transplanted stem cells or ex vivo gene therapy products. The process of making room in the bone marrow is known as conditioning, and the current standard of care for conditioning utilizes chemotoxic agents. Our second targeted conditioning product candidate, MGTA-45, is an ADC designed to selectively target and deplete both stem cells and immune cells, and it is intended to replace the use of chemotherapy-based conditioning prior to stem cell transplant in patients with blood cancers and autoimmune diseases. Lastly, our MGTA-145 product candidate, in combination with plerixafor, is designed to improve the stem cell mobilization process by which stem cells are mobilized out of the bone marrow and into the bloodstream to facilitate their collection for subsequent transplant back into the body for the purpose of resetting the immune system.

In January 2023, we voluntarily paused dosing in our MGTA-117 Phase 1/2 clinical trial for MGTA-117 in patients with R/R AML and MDS after the last participant dosed in Cohort 3 in the clinical trial experienced a Grade 5 serious adverse event, or SAE (respiratory failure and cardiac arrest resulting in death) deemed to be possibly related to MGTA-117. This safety event was reported to the FDA as the study’s third safety event which is of a type referred to as a “Suspected, Unexpected, Serious Adverse Reaction,” or SUSAR. The FDA subsequently placed the study on partial clinical hold in February 2023.

In April 2022, we announced a plan to more narrowly focus our capital allocation on the MGTA-117 targeted conditioning program, the MGTA-45 IND-enabling activities and the MGTA-145 stem cell mobilization efforts in sickle cell disease while also de-prioritizing other portfolio investments. We made certain reductions in our planned spending related to research platform-related investments in new disease targets, paused certain MGTA-145 investments, including the program’s planned MGTA-145 dosing and administration optimization clinical trial in healthy subjects and reduced planned general and administrative expenses. In connection with these reductions to our planned spending, we also reduced our workforce by 14%.

Our Strategy

Our strategy is to continue exploring strategic alternatives that include, without limitation, an acquisition, merger, business combination or other transaction. We are also exploring strategic transactions regarding our product candidates and related assets, including, without limitation, licensing transactions and asset sales.

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Our Product Candidates to Date

Stem Cell Transplant Overview

Stem cell transplant is a well-established and potentially curative medical procedure that can reset a patient’s blood and immune system after the patient has received treatment for certain blood cancers, genetic diseases, or autoimmune diseases. Stem cell transplants involve a three-step process: (i) stem cells are mobilized out of the patient’s or donor’s bone marrow and collected from the blood (or, in rare cases, surgically extracted from their bone marrow); (ii) the patient’s bone marrow is cleared of any remaining stem cells in order to make space to receive new transplanted stem cells; and (iii) the stem cells are transplanted into the patient via infusion where they fasten to, or engraft in, the bone marrow and grow into the blood cells and platelets that form the basis of a reset and rebuilt blood and immune system. All transplants are categorized as either autologous or allogeneic depending on the source of the new stem cells for the transplant. In an autologous transplant, the patient’s own stem cells are used. In an allogeneic transplant, patients receive cells from a stem cell donor.

Stem cell transplant, whether autologous or allogeneic, has broad applicability across disease settings, including blood cancers, gene therapies for genetic diseases and autoimmune diseases. It is the current standard of care for certain blood cancers such as acute myeloid leukemia, or AML, myelodysplastic syndromes, or MDS, multiple myeloma and non-Hodgkin’s lymphoma.

Hematopoietic stem cell, or HSC, based gene therapies also rely on the same steps of the stem cell transplant process with an additional step where collected stem cells are gene-corrected or modified to address the underlying disease prior to transplant. Such gene therapy approaches that leverage the stem cell transplant procedure are being investigated by numerous companies in a variety of diseases, including sickle cell disease, beta-thalassemia and lysosomal storage disorders. Autoimmune diseases such as multiple sclerosis and systemic sclerosis may also benefit from resetting the immune system through stem cell transplant.

Conditioning Opportunity

Before a patient can receive a stem cell transplant, patients must be prepared, or conditioned, for transplant. Conditioning is intended to be a final attempt to deplete disease-causing cells circulating in the blood stream or found in the bone marrow. It is also intended to deplete a sufficient number of cells, such as HSCs, in the bone marrow to make room for newly transplanted stem cells that will rebuild the healthy blood and immune system or, in the case of gene therapy, newly transplanted gene edited cells intended to address a genetic disease. Conditioning for stem cell transplant and gene therapy is currently burdensome and risky for both pediatric and adult patients. The agents used today are non-targeted and involve high doses of systemic, toxic chemotherapy and/or radiation, which are known carcinogens and increase the risk of developing cancer. The current treatments eradicate the stem cells, immune cells, and diseased cells but also indiscriminately damage DNA and kill normal, healthy cells in the body. These conditioning regimens can cause long-term lung injury and liver toxicity, serious infections, organ failure, infertility, secondary cancers and even death. Nearly all transplant patients experience complications as a result of current conditioning treatments, and conditioning toxicity is responsible for up to 35% of mortality following allogeneic transplants.

Whenever possible, physicians use the most aggressive conditioning regimens, known as myeloablative conditioning, or MAC, to generate optimal efficacy outcomes for oncology and gene therapy patients. For oncology patients who can tolerate these high-intensity conditioning regimens to prepare them for stem cell transplant, over 50% are alive and without disease relapse, known as relapse-free survival, at five years post-transplant, an impressive survival rate in these high-risk patient populations. However, approximately 20% of patients receiving MAC regimens die from complications related to the transplant procedure, known as transplant-related mortality, and a significant majority experience serious short- and long-term side effects.

For the many patients that cannot tolerate such intense and toxic regimens due to advanced age or co-morbidities, such as decreased organ function, recent efforts have focused on reducing chemotherapy doses in regimens known as reduced intensity conditioning, or RIC. While significantly better tolerated, these RIC regimens, when used alone, lack the potency to adequately deplete a sufficient number of leukemic cells and therefore RIC regimens have significantly poorer disease outcomes (due to relapse) at five years post-transplant. Over 50% of patients receiving RIC relapse and only approximately 30% of patients are alive without relapse at five years following stem cell transplant. Therefore, physicians and patients must currently choose between either the superior long-term efficacy of MAC or the improved safety and tolerability of RIC.

Currently only approximately 6% of eligible patients with multiple sclerosis and scleroderma receive a stem cell transplant, in part due to the significant risks of conditioning. Magenta’s targeted conditioning programs have also been designed to expand the number of autoimmune patients who can benefit from immune reset with effective and safe targeted conditioning.

Magenta’s Targeted Conditioning Product Candidates

Magenta’s targeted conditioning product candidates have been designed to address the unmet need in conditioning for stem cell transplantation or ex vivo gene therapy with a goal of being less toxic than the current radiation and chemotherapy-based treatments.

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The Magenta programs have been developed with a focus on targeted conditioning where only specific cell types are removed and it is more tailored to the patient’s disease and transplant requirements.

MGTA-117 and MGTA-45 utilize antibody drug conjugates, or ADCs, where a monoclonal antibody which is specific for a cell surface protein is coupled with a payload that enables cell depletion. The antibody and the payload are conjugated to each other via a molecule known as a linker. The approach is intended to allow the ADC to bind to the receptor on the cell targeted for depletion and release the payload inside the target cell to cause the target cell’s depletion.

In our development of ADCs for use in conditioning, Magenta sought to optimize several key parameters:

First, the antibody component of the ADC must specifically target a receptor that is expressed on the cells of interest.

Second, to comply with typical stem cell transplant conditioning timelines, the ADC must have suitable potency to ensure that the agent is able to deplete the target cells rapidly, in days rather than weeks or months.

Third, the ADC clearance from the body needs to be accelerated so that it is eliminated by the time the transplanted cells are infused into the patient, typically within a week of starting conditioning. This requirement stems from the fact that the target receptor is expressed on cells present in the patient but also on the newly transplanted cells which should not be targeted for depletion in order for the transplant to be successful.

Finally, the drug must be well-tolerated for patients at dose levels where stem cells are effectively removed. We designed the ADC with a stable linker-payload which is intended to ensure that the payload used for cell depletion is primarily released intracellularly following internalization by target cells.

MGTA-117

MGTA-117 is an anti-CD117 antibody conjugated to an amanitin payload, and it targets CD117, also known as c-Kit, which is highly expressed on HSCs and leukemia cells. MGTA-117 has been designed to deplete CD117-expressing target cells in the blood and/or bone marrow prior to a patient undergoing stem cell transplant or receiving an ex vivo gene therapy product. One of the primary goals of MGTA-117 was to lessen the need for high-dose or high-intensity chemotherapeutic agents prior to such transplant or gene therapy. In the case of HSC based gene therapy applications, a goal of MGTA-117 was to potentially eliminate the need for chemotherapeutic agents altogether.

Clinical Development of MGTA-117

In the first quarter of 2022, we initiated the Phase 1/2 clinical trial for MGTA-117 in patients with relapsed/refractory AML and MDS, and the trial was designed as a multi-center, open-label, single-ascending-dose clinical trial. Dose escalation in the clinical trial was designed as a modified Fibonacci sequence. The primary outcomes for the clinical trial were defined as the evaluation of the safety profile, pharmacokinetics and pharmacodynamics of MGTA-117 as a single dose.

We reported early clinical observations from Cohort 1 (dose level 0.02 mg/kg) on May 16, 2022 that indicated evidence of MGTA-117’s potential to bind CD117+ cells, reduce CD117+ erythroid progenitor cells in the bone marrow, reduce leukemic blasts in the bone marrow, rapidly clear the body and maintain a favorable tolerability profile.

On December 12, 2022, we announced preliminary clinical results for MGTA-117 from 15 patients across the first three dose-escalation cohorts and showed single-agent activity with no dose-limiting toxicities, or DLTs. In the fourth quarter of 2022, we initiated formal engagements with regulatory agencies to transition MGTA-117 into the transplant-eligible AML and MDS patient population, with the intention of engaging regulators in the first half of 2023. Enrollment of the trial continued into Cohort 4 (dose level 0.13 mg/kg).

On December 20, 2022, we announced that we stopped dosing in Cohort 4, pursuant to the clinical trial protocol, due to the observance of DLTs involving pulmonary distress, in two of the three participants dosed in Cohort 4. As a result of these observations and due to the unexpected nature of the pulmonary involvement, two SUSARs were reported to the U.S. Food and Drug Administration, or FDA. In accordance with the clinical trial protocol and, following the recommendation of the trial’s safety Cohort Review Committee, we resumed dosing in Cohort 3 (dose level 0.08 mg/kg). Each of the Cohort 4 participants who experienced a DLT subsequently recovered, and all three participants in Cohort 4 (3/3) with relapsed or refractory disease achieved morphologic and molecular remission in the bone marrow resulting in eligibility for transplant.

On January 25, 2023, we announced that the last participant dosed in Cohort 3 (dose level 0.08 mg/kg) in the clinical trial experienced a Grade 5 SAE (respiratory failure and cardiac arrest resulting in death) deemed to be possibly related to MGTA-117, and this was reported to the FDA as a SUSAR because the event was still deemed to be unexpected at the time. After consultation with the

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trial’s safety Cohort Review Committee, and with the highest regard for patient safety, we voluntarily paused all dosing in the clinical trial. The FDA subsequently placed the study on partial clinical hold in February 2023.

Following these events, Magenta reviewed the MGTA-117 program as well as its broader program portfolio both as stand-alone programs and collectively. In February 2023, after a thorough review of internal and external factors, we announced the decision to halt further development of Magenta’s programs and to conduct a comprehensive review of strategic alternatives for the programs and the company. As a result of that decision, we discontinued the MGTA-117 Phase 1/2 clinical trial.

MGTA-117 Clinical Data

Magenta conducted the Phase 1/2 clinical trial in R/R AML and MDS patients in which 22 participants who were ineligible for stem cell transplant due to their disease burden were dosed with MGTA-117, administered intravenously as a single dose. After treatment with MGTA-117, five study participants became eligible for and progressed to stem cell transplant. Six clinically meaningful responses were observed: four participants experienced complete remission with incomplete count recovery (CRi), and two participants experienced bone marrow complete remissions (Marrow CR). Three study participants experienced DLTs, two in Cohort 4 and one in Cohort 3, which were reported to the FDA as SUSARs. Magenta terminated the clinical trial in February 2023.

The clinical trial data were presented as a poster at the Transplantation and Cellular Therapy Conference, or TCT, on February 15-18, 2023. The poster is as follows below and was entitled “MGTA-117, an Anti-CD117-Amanitin Antibody-Drug Conjugate, in Participants With Relapsed/Refractory Adult Acute Myeloid Leukemia (AML) and Myelodysplasia With Excess Blasts (MDS-EB): Safety, Pharmacokinetics, and Pharmacodynamics Initial Findings from a Phase 1/2 Study”.

Depletion Data

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Pharmacokinetics and Receptor Occupancy, or RO, Data

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Safety and Tolerability Data

Collaborations Regarding MGTA-117

We had entered into two research and clinical collaborations to evaluate the potential utility of MGTA-117 for conditioning of patients prior to stem cell-based gene therapies:

Lysosomal Storage Disorders. We entered into an agreement with AVROBIO, Inc. to evaluate the potential utility of MGTA-117 for conditioning of patients receiving one or more of AVROBIO, Inc.’s investigational lentiviral gene therapies. We terminated this agreement in February 2023.

Hemoglobinopathies. We entered into an agreement with Beam Therapeutics, Inc. to evaluate the potential utility of MGTA-117 for conditioning of patients with sickle cell disease and beta-thalassemia receiving Beam Therapeutics, Inc.’s base editing gene therapies. We terminated this agreement in February 2023.

MGTA-45

Our second ADC-based conditioning program, MGTA-45 (formerly known as CD45-ADC) is an anti-human CD45 antibody conjugated to a DNA-interacting payload, which is highly expressed on HSCs, leukemia cells and immune cells. It is designed to deplete CD45-expressing target cells in the blood and/or bone marrow prior to a patient undergoing either an allogeneic stem cell transplant, likely to treat leukemia, or an autologous transplant for severe autoimmune disease. The ability of MGTA-45 to deplete both HSC’s and immune cells is a critical aspect of the immune reset needed for the treatment of severe autoimmune disease. Similarly, in the allogeneic blood cancer transplant setting, the depletion of host immune cells is critical to address immune-mediated

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rejection of the incoming foreign stem cells. Additionally, MGTA-45 has the potential to target blood cancer cells expressing CD45 which may provide additional therapeutic benefit for cancer patients.

Development of MGTA-45

In the third quarter of 2022, we successfully completed a dose-ranging toxicology preclinical study. Good Manufacturing Practice, or GMP, manufacturing and other IND,-enabling activities were ongoing for the MGTA-45 program as of December 2022. In January 2023, the FDA provided feedback in a Type B response on our proposed Good Laboratory Practice, or GLP, toxicological study design and our first-in-human design, including our proposed starting dose and further dose escalations.

After our February 2023 announcement to conduct a comprehensive review of strategic alternatives for our programs and the company, we made the decision to stop incurring certain costs relating to MGTA-45 as part of our efforts to explore a program-specific transaction, including a potential licensing transaction or a sale of the asset, given the program’s early and promising profile.

MGTA-45 Preclinical Data

Magenta’s preclinical studies demonstrated that targeting CD45-expressing hematopoietic cells with MGTA-45 potently depleted HSCs, CD45-expressing leukemia cells and immune cells in vitro. In healthy non-human primates, a single dose of MGTA-45 depleted HSCs in the bone marrow, depleted immune cells in the bone marrow and blood and enabled autologous HSC transplant in a clinically relevant nonhuman primate gene-therapy model. MGTA-45 also significantly extended survival in a patient-derived xenograft model of AML R/R compared to standard of care. These MGTA-45 preclinical data were presented as a poster at TCT on February 15-18, 2023.

Stem Cell Mobilization Opportunity

Stem cell mobilization is a process by which stem cells are stimulated out of the bone marrow and into the bloodstream so that they are available for collection for future reinfusion. The collected cells are then preserved, frozen, and stored until the time of transplant. We developed MGTA-145 as a new approach to stem cell mobilization. There are three methods of mobilizing and collecting stem cells from either patients or healthy donors for transplant:

mobilization into the peripheral blood, which typically requires several days of injections of a drug or combination of drugs to mobilize the cells, or move them from the bone marrow into the bloodstream, where they are then collected through a process called apheresis;

extraction from the bone marrow in a process known as bone marrow harvest, which requires a procedure performed under general anesthesia where cells are withdrawn directly from the bone marrow with needle aspirates; or

harvesting from umbilical cord blood units, which are stored in cord blood banks.

Successful stem cell transplant requires collection of HSCs in both sufficient number and functionality, whether from the patient or a donor, to allow for robust engraftment and rebuilding of the blood and immune systems. Higher cell doses are associated with better outcomes and are especially important for gene therapy applications, which require processing of the stem cells following collection. Mobilizing stem cells from the bone marrow to the blood has been shown to be an effective way to collect stem cells for transplant. Approximately 85% of the approximately 90,000 stem cell transplants performed globally each year use mobilization and collection in the peripheral blood from either donors or patients.

Current approaches for stem cell mobilization include granulocyte colony-stimulating factor, or G-CSF, which mobilizes stem cells indirectly, requires repeated daily injections and is associated with significant side effects, including bone pain and, in some cases, splenic rupture and death. The multi-day regimen requires at least five days of injections of G-CSF, and side effects can be disruptive for both patients having their cells collected for autologous transplants and for healthy volunteers donating their cells for allogeneic transplants. For patients who are unable to mobilize a sufficient number of functional stem cells with G-CSF, physicians may add another drug, known as plerixafor. Plerixafor is a small molecule CXCR4 antagonist that blocks a pathway that otherwise plays an essential role in attracting and retaining HSCs in the bone marrow. It is approved for use in combination with G-CSF for multiple myeloma, and non-Hodgkin’s lymphoma patients who fail to achieve sufficient mobilization of stem cells with G-CSF alone. G-CSF can mobilize stem cells as a single agent but not to sufficient levels to be effective as a standalone agent in most disease settings.

The current unpredictability and inefficiency of stem cell mobilization and collection can also pose a significant logistical burden on transplant and apheresis centers. When planning for a patient’s transplant, transplanting physicians cannot reliably predict at the outset how long it will take to collect the number of cells required. In addition, each day scheduled for attempted mobilization and collection can cause an accumulation of both the direct costs associated with the repeated use of mobilization agents and other

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healthcare resources, including personnel time, and the indirect costs associated with the need to block time in the limited number of apheresis chairs in transplant centers that are used to collect stem cells. It is difficult to predict whether mobilization with G-CSF will be successful, especially in heavily treated blood cancer patients. Many patients require multiple collections, including approximately 40% of blood cancer patients. Finally, patients with sickle cell disease can have severe side effects with G-CSF, including potentially fatal complications, and therefore, plerixafor is the only available mobilization option for sickle cell disease patients. However, because of its poor efficacy as a standalone agent and the high number of stem cells required for a transplant in sickle cell disease, multiple doses of plerixafor and collections are needed in approximately 75% of sickle cell disease patients.

MGTA-145

MGTA-145 has been designed to be a potential first-line standard of care for stem cell mobilization in a broad range of diseases, for both autologous and allogeneic transplants. MGTA-145, a CXCR2 agonist, works in combination with plerixafor, a CXCR4 antagonist, to harness the physiological mechanism of stem cell mobilization. MGTA-145 received Orphan Drug Designation from the FDA for mobilization of HSCs to the peripheral blood for collection and subsequent transplant.

In February 2023, after a thorough review of internal and external factors, we announced the decision to halt further development of Magenta’s programs and to conduct a comprehensive review of strategic alternatives for the programs and the company. As a result of that decision, we discontinued the Phase 2 clinical trial in SCD.

Clinical Development of MGTA-145

MGTA-145 Phase 1 Clinical Data – Healthy Subjects

Our Phase 1 clinical trial of MGTA-145 plus plerixafor in healthy subjects met all primary and secondary endpoints. Clinical endpoints included safety and tolerability, pharmacokinetics, target engagement and pharmacodynamic effects. Data from the trial presented at the ASH annual meeting in December 2020 showed that MGTA-145 was safe and well tolerated as a single agent and in combination with plerixafor, and that MGTA-145 in combination with plerixafor demonstrated rapid, single-day mobilization and collection of sufficient numbers of functional stem cells. MGTA-145 was shown to engage CXCR2 on neutrophils to mobilize CD34+ stem cells into peripheral blood with limited neutrophil activation, which may minimize risk of vaso-occlusive crises in patients with sickle cell disease.

MGTA-145 Phase 2 Clinical Data – Phase 2 Investigator-Initiated Trial in Multiple Myeloma

Magenta supported a Phase 2 investigator-initiated clinical trial at Stanford University evaluating the utility of MGTA-145, combination with plerixafor, in mobilizing and collecting stem cells from 25 multiple myeloma patients. The clinical trial showed that MGTA-145, in combination with plerixafor, mobilized a sufficient number of stem cells for transplantation and met the trial’s primary endpoint in 88% of patients (22/25). As we reported previously, all patients transplanted with cells mobilized by MGTA-145 plus plerixafor had successful engraftment (18/18 patients) with prolonged durability through the 100-day follow-up period (13/13 patients) which were two key exploratory endpoints. The regimen was generally well-tolerated.

Upon conclusion of the trial, we decided that a dosing and administration optimization clinical trial would be more beneficial to the overall MGTA-145 program due to its applicability to both allogeneic and autologous mobilization. But ultimately, we did not initiate that planned study due to the unfavorable state of the capital markets for biotechnology companies and our decision in April 2022 to more narrowly focus our capital allocation on MGTA-117 and the MGTA-145 Phase 2 stem cell mobilization clinical trial in patients with SCD.

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Phase 2 Sickle Cell Disease Stem Cell Mobilization and Collection (Cell Characterization; Pre-Clinical Gene Modification Model).

We entered into a Phase 2 clinical collaboration with bluebird bio, Inc. to evaluate the safety and potential utility of MGTA-145, in combination with plerixafor, for the mobilization and collection of stem cells in patients with sickle cell disease. Under the agreement, the companies would co-fund the clinical trial. Each party planned to characterize the collected cells, and we planned to gene-modify the cells and transplant them into established pre-clinical models to evaluate engraftment. Data from this clinical trial were intended to provide proof-of-concept for MGTA-145, in combination with plerixafor, as the preferred mobilization regimen for patients with sickle cell disease and, more broadly, across all HSC gene therapy applications. No meaningful data sets were collected in the clinical trial due to a lack of enrollment. In February 2023, we discontinued the clinical trial. We subsequently terminated the collaboration agreement with bluebird.

Magenta’s Research Programs

Our research efforts most recently focused on future ADC-based conditioning programs. Our most advanced research program targets a receptor that is expressed on T cells, a type of immune cell. T cell depletion is currently performed with highly toxic, non-specific drugs which can lead to immune deficiency, infections and other complications, including secondary autoimmune reactions. We were pursuing targets expressed on the surfaces of T cells with the goal of offering a safer and more optimized targeted conditioning approach through T cell depletion before cell therapy such as CAR-T and/or Natural Killer cell therapy for blood cancers, prevention of stem cell rejection prior to allogeneic stem cell transplant or achievement of immune system reset through autologous stem cell transplant in patients with autoimmune diseases.

In February 2023, after a review of Magenta’s business, programs, resources and capabilities, we announced the decision to halt further development of Magenta’s programs and to conduct a comprehensive review of strategic alternatives. As a result of that decision, we ceased development of our research programs.

Manufacturing

We do not own or operate, and have no plans to establish, any manufacturing facilities. We have historically relied upon, and continue to rely upon, third-party contract development and manufacturing organizations, or CDMOs, for raw materials, drug substance and drug product for preclinical research and ongoing clinical trials, as needed. In February 2023, after a review of Magenta’s business, programs, resources and capabilities, we announced the decision to conduct a comprehensive review of strategic alternatives. As a result of that decision, we are in the process of terminating certain manufacturing-related relationships.

Competition

The biotechnology industry is extremely competitive in the race to develop new products and treatment modalities. We may face competition from companies focused on traditional therapeutic modalities, such as small molecules and antibodies, as well as companies developing next-generation cell therapies. Competition is likely to come from multiple sources, including larger pharmaceutical companies, biotechnology companies and academia. Many of our competitors may have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, clinical trials, regulatory approvals, and

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

As part of our strategic review process, we began exploring potential strategic alternatives that include, without limitation, an acquisition, merger, business combination or other transaction. We are also exploring strategic transactions regarding our product candidates and related assets, including, without limitation, licensing transactions and asset sales.

Given the economic downturn in the capital markets, and in the biotechnology sector in particular, we may face substantial competition for attractive counterparties for any of the proposed strategic transactions we are reviewing. For example, there may be many other biotech and pharmaceutical companies that halt development of their programs and instead choose to pursue strategic transactions like the ones we are currently exploring. These companies may possess greater financial and managerial resources than we do, and they may have more attractive product candidates, intellectual property or other assets. As a result, these other companies may prove to be more attractive than Magenta to counterparties pursuing strategic transactions. There can be no assurance that our strategic review process will result in Magenta pursuing a transaction, or that any transaction, if pursued, will be completed on terms favorable to Magenta and its stockholders.

Licenses and Collaborations

For a description of our licenses and collaboration agreements, see Note 9 to our consolidated financial statements included in this Annual Report on Form 10-K.

Intellectual Property

Overview

We strive to protect the proprietary product candidates and technologies that we believe are important to our business, including seeking and maintaining patent protection intended to cover the composition of matter of our product candidates, their methods of use, related technologies, diagnostics, and other inventions. As of December 31, 2022, our patent portfolio was composed of more than 15 issued patents and more than 250 pending patent applications in the U.S. and foreign jurisdictions. In addition, we have licensed more than 100 issued patents and pending patent applications in the U.S. and foreign jurisdictions.

Company-Owned Patent Rights Relating to Our Targeted Conditioning and Post-Transplant Complications Programs

With regard to our targeted conditioning and post-transplant complications programs, our owned patent portfolio includes six issued U.S. patents, eleven issued foreign patents, and more than 200 pending patent applications in the U.S. and foreign jurisdictions. Our targeted conditioning and post-transplant complications patent portfolio includes, for example, composition of matter and methods of use claims directed to program-specific ADCs and antibodies, as well as claims directed more generally to our targeted conditioning and post-transplant complications programs that provide coverage for multiple programs.

Our CD117 patent portfolio contains patent families directed to compositions and methods for the depletion of CD117+ cells as well as patent families directed to the MGTA-117 composition of matter and methods of use. As of December 31, 2022, our CD117 patent portfolio included three issued U.S. patents, more than eight pending U.S. patent applications, more than 70 patents and pending patent applications in foreign jurisdictions, five families of pending U.S. provisional patent applications, and a pending Patent Cooperation Treaty, or PCT, patent application. The issued U.S. patent would be expected to expire in 2037, absent any applicable patent term extensions. Any other patents that issue from the pending patent applications in this portfolio would be expected to expire between 2037 and 2041, absent any applicable patent term extensions.

Company-Owned Patent Rights Relating to Our Mobilization Program

Our MGTA-145 patent portfolio contains patent families directed to methods of mobilizing HSCs. As of December 31, 2022, we owned two issued U.S. patents, six pending U.S. patent applications, more than 14 pending foreign patent applications, and one pending PCT patent application, and we co-owned one pending U.S. patent application and six pending foreign patent applications. The issued U.S. patent would be expected to expire in 2037, absent any applicable patent term extensions. Any other patents that issue from the pending patent applications would be expected to expire between 2037 and 2042, absent any applicable patent term extensions.

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Company-Owned Patent Rights Relating to Our Cell Therapy Programs

Our cell therapy patent portfolio contains patent families directed to compositions of matter for aryl hydrocarbon receptor antagonists, including E478, methods of using these compounds, and methods of treatment using expanded HSCs. As of December 31, 2022, we owned three issued U.S. patents, seven pending U.S. patent applications, and more than 50 pending patent applications in foreign jurisdictions. The issued U.S. patents would be expected to expire in 2038, absent any applicable patent term extensions. Any patents that issue from the pending patent applications would be expected to expire between 2038 and 2039, absent any applicable patent term extensions.

In-Licensed Harvard Portfolio

We have exclusively licensed a patent portfolio from the President and Fellows of Harvard College, or Harvard, applicable to our targeted conditioning and mobilization programs that contains patent families directed to compositions and methods for non-myeloablative conditioning, compositions, and methods for mobilizing HSCs, and highly engraftable hematopoietic stem cells and their uses. As of December 31, 2022, this patent portfolio included four issued U.S. patents, four pending U.S. patent applications, and more than 30 patents and pending patent applications in foreign jurisdictions. The issued U.S. patents would be expected to expire in 2034 and 2036, absent any applicable patent term extensions. Any patents that issue from the pending patent applications in this patent portfolio would be expected to expire between 2034 and 2037, absent any applicable patent term extensions.

In-Licensed Heidelberg Portfolio

We have licensed a patent portfolio from Heidelberg Pharma applicable to our targeted conditioning and post-transplant complications programs that contains patent families directed to amatoxin conjugates, methods of treatment, and methods of synthesizing amatoxins. As of December 31, 2022, these families included more than 90 issued patents and pending patent applications in jurisdictions worldwide. The issued patents and any other patents that issue from these families would be expected to expire between 2030 and 2040, absent any applicable patent term extensions.

The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries in which we have filed, including the U.S., the patent term is 20 years from the earliest filing date of a non-provisional patent application. In the U.S., a patent’s term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the U.S. Patent and Trademark Office in examining and granting a patent or may be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug or biological product may also be eligible for patent term extension when FDA approval is granted for a portion of the term effectively lost as a result of the FDA regulatory review period, subject to certain limitations and provided statutory and regulatory requirements are met. Any such patent term extension can be for no more than five years, only one patent per approved product can be extended, the extension cannot extend the total patent term beyond 14 years from approval, and only those claims covering the approved drug, a method for using it or a method for manufacturing it may be extended. We may not receive an extension if we fail to exercise due diligence during the testing phase or regulatory review process, fail to apply within applicable deadlines, fail to apply prior to expiration of relevant patents or otherwise fail to satisfy applicable requirements. Moreover, the length of the extension could be less than we request. In the future, if and when our product candidates receive approval from the FDA or foreign regulatory authorities, we expect to apply for patent term extensions on issued patents we may obtain in the future covering those products, depending upon the length of the clinical trials for each product and other factors. There can be no assurance that any of our pending patent applications will issue or that we will benefit from any patent term extension or favorable adjustment to the term of any of our patents.

As with other biotechnology and pharmaceutical companies, our ability to maintain and solidify our proprietary and intellectual property position for our product candidates will depend on our success in obtaining effective patent claims and enforcing those claims if granted. However, our owned and licensed pending patent applications, and any patent applications that we may in the future file or license from third parties may not result in the issuance of patents. We also cannot predict the breadth of claims that may be allowed or enforced in our patents. Any issued patents that we may receive in the future may be challenged, invalidated, infringed, or circumvented. In addition, because of the extensive time required for clinical development and regulatory review of a product candidate we may develop, it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby limiting the protection such patent would afford the respective product and any competitive advantage such patent may provide. For more information, see the section entitled “Item 1A. Risk Factors – Risks Related to Intellectual Property.”

Other IP Rights

In addition to patents, we rely upon unpatented trade secrets and know-how and continuing technological innovation to develop and maintain our competitive position. However, trade secrets and know-how can be difficult to protect. We seek to protect our proprietary information, in part, by executing confidentiality agreements with our collaborators and scientific advisors, and

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non-competition, non-solicitation, confidentiality, and invention assignment agreements with our employees and consultants. We have also executed agreements requiring assignment of inventions with selected scientific advisors and collaborators. The confidentiality agreements we enter into are designed to protect our proprietary information and the agreements or clauses requiring assignment of inventions to us are designed to grant us ownership of technologies that are developed through our relationship with the respective counterparty. We cannot guarantee, however, that we have executed such agreements with all applicable counterparties, such agreements will not be breached, or that these agreements will afford us adequate protection of our intellectual property and proprietary rights. For more information, see the section entitled “Item 1A. Risk Factors—Risks Related to Intellectual Property.”

Trademarks

We have filed and obtained trademark protection for the MAGENTA THERAPEUTICS character mark and service mark logo for pharmaceutical research and development services and biochemical research and development services. We have also filed for trademark protection for the #THECOLOROFCURE character mark for promoting public awareness of medical disorders and their treatment, promoting public awareness of bone marrow diseases, cancer, tumors, infectious diseases, autoimmune diseases and related diseases and disorders, providing a website featuring medical information, and providing medical information. We plan to register trademarks in connection with our future products.

Governmental Regulation

Compliance with various governmental regulations has an impact on our business, including our capital expenditures and competitive position, which can be material. We incur costs to monitor and take actions to comply with governmental regulations that are applicable to our business, which include, among others, federal securities laws and regulations, applicable stock exchange requirements, tax laws and regulations, environmental and health and safety laws and regulations and the regulations that govern our products and drug discovery efforts. Government authorities in the U.S. at the federal, state and local level and in other countries extensively regulate, among other things, the research, development, testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval monitoring and reporting, marketing and export and import of drug and biological products, such as MGTA-117, MGTA-145 and any product candidates. Generally, before a new drug or biologic can be marketed, considerable data demonstrating its quality, safety and efficacy must be obtained, organized into a format specific for each regulatory authority, submitted for review and approved by the regulatory authority.

In addition to the discussion below, see “Item 1A. Risk Factors” for a discussion of material risks to us, including, to the extent material, to our competitive position, relating to governmental regulations, and see “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” together with our consolidated financial statements, including the related notes included therein, for a discussion of material information relevant to an assessment of our financial condition and results of operations, including, to the extent material, the effects that compliance with governmental regulations may have upon our capital expenditures.

U.S. drug and biologic development

In the U.S., the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and its implementing regulations and biologics under the FDCA, the Public Health Service Act, or PHSA, and their implementing regulations. Both drugs and biologics also are subject to other federal, state and local statutes and regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, and local statutes and regulations requires the expenditure of substantial time and financial resources. Failure to comply with the applicable U.S. requirements at any time during the product development process, approval process or post-market may subject an applicant to administrative or judicial sanctions. These sanctions could include, among other actions, the FDA’s refusal to approve pending applications, withdrawal of an approval, a clinical hold, untitled or warning letters, product recalls or market withdrawals, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement and civil or criminal penalties. Any agency or judicial enforcement action could have a material adverse effect on us.

MGTA-117, MGTA-145 and any other product candidates must be approved by the FDA through either a New Drug Application, or NDA, or a Biologics License Application, or BLA, process before they may be legally marketed in the U.S. The process generally involves the following:

completion of extensive preclinical studies in accordance with applicable regulations, including studies conducted in accordance with GLP requirements;

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

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

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performance of adequate and well-controlled human clinical trials in accordance with applicable IND regulations, Good Clinical Practice, or GCP, requirements and other clinical trial-related regulations to establish the safety and efficacy of the investigational product for each proposed indication;

submission to the FDA of an NDA or BLA;

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

satisfactory completion of one or more FDA pre-approval inspections of the manufacturing facility or facilities where the drug or biologic will be produced to assess compliance with cGMP requirements to assure that the facilities, methods and controls are adequate to preserve the drug or biologic’s identity, strength, quality and purity;

potential FDA audit of the clinical trial sites that generated the data in support of the NDA or BLA;

payment of user fees for FDA review of the NDA or BLA, unless a waiver is applicable; and

FDA review and approval of the NDA or BLA, including consideration of the views of any FDA advisory committee, prior to any commercial marketing or sale of the drug or biologic in the U.S.

The preclinical and clinical testing and approval process requires substantial time, effort and financial resources, and the regulatory scheme for drugs and biologics is evolving and subject to change at any time. Should we resume the development of our product candidates, we cannot be certain that any approvals for our product candidates will be granted on a timely basis, or at all.

Preclinical studies and IND

Before testing any drug or biological candidate in humans, the product candidate must undergo rigorous preclinical testing. Preclinical studies include laboratory evaluation of product chemistry and formulation, as well as in vitro and animal studies to assess safety and, in some cases, to establish a rationale for therapeutic use. The conduct of preclinical studies is subject to federal and state regulations and requirements, including GLP regulations for safety/toxicology studies.

An IND sponsor must submit the results of the preclinical tests, together with manufacturing information, analytical data, any available clinical data or literature and plans for clinical trials, among other things, to the FDA as part of an IND. An IND is a request for authorization from the FDA to administer an investigational product to humans and must become effective before human clinical trials may begin. Some long-term preclinical testing, such as animal tests of reproductive adverse events and carcinogenicity, may continue after the IND is submitted. An IND automatically becomes effective 30 days after receipt by the FDA unless, before that time, the FDA raises concerns or questions related to one or more proposed clinical trials and places the trial on clinical hold. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the clinical trial can begin. As a result, submission of an IND may not result in the FDA allowing clinical trials to commence. The FDA may also impose clinical holds at any time before or during clinical trials due to safety concerns or noncompliance and may be imposed on all products within a certain class of products.

Clinical trials

The clinical stage of development involves the administration of the investigational product to healthy volunteers or patients under the supervision of qualified investigators, generally physicians not employed by or under the trial sponsor’s control, in accordance with GCP requirements, which include the requirement that all research subjects provide their informed consent for their participation in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria, and the parameters to be used to monitor subject safety and assess efficacy. Each protocol, and any subsequent amendments to the protocol, must be submitted to the FDA as part of the IND. Furthermore, each clinical trial must be reviewed and approved by an IRB for each institution at which the clinical trial will be conducted to ensure that the risks to individuals participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the informed consent form that must be provided to each clinical trial subject or his or her legal representative and must monitor the clinical trial until completed. There also are requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries.

A sponsor who wishes to conduct a clinical trial outside of the U.S. may, but often need not, obtain FDA authorization to conduct the clinical trial under an IND. If a foreign clinical trial is not conducted under an IND, the sponsor may submit data from the clinical trial to the FDA in support of an NDA or BLA. The FDA will accept a well-designed and well-conducted foreign clinical trial not conducted under an IND if the trial was conducted in accordance with GCP requirements, and the FDA is able to validate the data through an onsite inspection if deemed necessary.

Clinical trials are generally conducted in three sequential phases, known as Phase 1, Phase 2 and Phase 3, and may overlap.

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Phase 1 clinical trials generally involve a small number of healthy volunteers or disease-affected patients who are initially exposed to a single dose and then multiple doses of the product candidate. The primary purpose of these clinical trials is to assess the metabolism, pharmacologic action, side effect tolerability and safety of the product candidate.

Phase 2 clinical trials involve studies in disease-affected patients to evaluate proof of concept and/or determine the dose required to produce the desired benefits. At the same time, safety and further pharmacokinetic and pharmacodynamic information is collected, possible adverse effects and safety risks are identified, and a preliminary evaluation of efficacy is conducted.

Phase 3 clinical trials generally involve a large number of patients at multiple sites and are designed to provide the data necessary to demonstrate the product candidate’s safety and effectiveness for its intended use, and to establish the overall benefit/risk relationship of the product candidate and provide an adequate basis for product labeling.

Post-approval trials, sometimes referred to as Phase 4 clinical trials, may be conducted after initial marketing approval. These trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication and are commonly intended to generate additional safety data regarding use of the product in a clinical setting. In certain instances, the FDA may mandate the performance of Phase 4 clinical trials as a condition of approval of an NDA or BLA.

Progress reports detailing the results of the clinical trials, among other information, must be submitted at least annually to the FDA and written IND safety reports must be submitted to the FDA and the investigators 15 days after the trial sponsor determines the information qualifies for reporting for serious and unexpected suspected adverse events, findings from other studies or animal or in vitro testing that suggest a significant risk for human subjects and any clinically important increase in the rate of a serious suspected adverse reaction compared to that listed in the protocol or investigator brochure. The sponsor must also notify the FDA of any unexpected fatal or life-threatening suspected adverse reaction as soon as possible but in no case later than seven calendar days after the sponsor’s initial receipt of the information.

Phase 1, Phase 2, Phase 3 and other types of clinical trials may not be completed successfully within any specified period, if at all. The FDA or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug or biologic has been associated with unexpected serious harm to patients. Additionally, some clinical trials are overseen by an independent group of qualified experts organized by the clinical trial sponsor, known as a data safety monitoring board or committee. This group provides authorization for whether a trial may move forward at designated checkpoints based on access to certain data from the trial. Concurrent with clinical trials, companies usually complete additional animal studies, must develop additional information about the chemistry and physical characteristics of the drug or biologic and finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product and, among other things, companies must develop methods for testing the identity, strength, quality and purity of the final product. Additionally, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidates do not undergo unacceptable deterioration over their shelf life.

NDA/BLA and FDA review process

Following completion of the clinical trials, data are analyzed to assess whether the investigational product is safe and effective for the proposed indicated use or uses. The results of preclinical studies and clinical trials are then submitted to the FDA as part of an NDA or BLA, along with proposed labeling, chemistry and manufacturing information to ensure product quality and other relevant data. The NDA or BLA is a request for approval to market the drug or biologic for one or more specified indications and must contain proof of safety and efficacy for a drug or safety, purity and potency for a biologic. The application may include both negative and ambiguous results of preclinical studies and clinical trials, as well as positive findings. Data may come from company-sponsored clinical trials intended to test the safety and efficacy of a product’s use or from a number of alternative sources, including studies initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and efficacy of the investigational product to the satisfaction of the FDA. FDA approval of an NDA or BLA must be obtained before a drug or biologic may be marketed in the U.S.

Under the Prescription Drug User Fee Act, or PDUFA, as amended, each NDA or BLA must be accompanied by a user fee. The FDA adjusts the PDUFA user fees on an annual basis. Fee waivers or reductions are available in certain circumstances, including a waiver of the application fee for the first application filed by a small business. Additionally, no user fees are assessed on NDAs or BLAs for products designated as orphan drugs, unless the product also includes a non-orphan indication.

The FDA reviews all submitted NDAs and BLAs before it accepts them for filing and may request additional information rather than accepting the NDA or BLA for filing. The FDA generally makes a decision on accepting an NDA or BLA for filing within 60 days of receipt, and such decision could include a refusal to file by the FDA. Once the submission is accepted for filing, the FDA

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begins an in-depth review of the NDA or BLA. Under the goals and policies agreed to by the FDA under PDUFA, the FDA targets ten months from the filing date to complete its initial review of a new molecular entity NDA or original BLA and respond to the applicant, and six months from the filing date of a new molecular entity NDA or original BLA designated for priority review. The FDA does not always meet its PDUFA goal dates for standard and priority NDAs or BLAs, and the review process is often extended by FDA requests for additional information or clarification.

Before approving an NDA or BLA, the FDA will conduct a pre-approval inspection of the manufacturing facilities for the new product to determine whether they comply with cGMP requirements. The FDA will not approve the product unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and are adequate to assure consistent production of the product within required specifications. The FDA also may audit data from clinical trials to ensure compliance with GCP requirements. Additionally, the FDA may refer applications for novel products or products which present difficult questions of safety or efficacy to an advisory committee, typically a panel that includes clinicians and other experts, for review, evaluation, and a recommendation as to whether the application should be approved and under what conditions, if any. The FDA is not bound by recommendations of an advisory committee, but it considers such recommendations when making decisions on approval. The FDA likely will reanalyze the clinical trial data, which could result in extensive discussions between the FDA and the applicant during the review process. After the FDA evaluates an NDA or BLA, it will issue an approval letter or a Complete Response Letter. An approval letter authorizes commercial marketing of the drug or biologic with specific prescribing information for specific indications. A Complete Response Letter indicates that the review cycle of the application is complete, and the application will not be approved in its present form. A Complete Response Letter usually describes all of the specific deficiencies in the NDA or BLA identified by the FDA. The Complete Response Letter may require additional clinical data, additional pivotal Phase 3 clinical trial(s) and/or other significant and time-consuming requirements related to clinical trials, preclinical studies or manufacturing. If a Complete Response Letter is issued, the applicant may either resubmit the NDA or BLA, addressing all of the deficiencies identified in the letter, withdraw the application, or request an opportunity for a hearing. Even if such data and information are submitted, the FDA may decide that the NDA or BLA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive and the FDA may interpret data differently than we interpret the same data.

Orphan drug designation

Under the Orphan Drug Act, the FDA may grant orphan drug designation to a drug or biological product intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 individuals in the U.S., or 200,000 or more individuals in the U.S. and for which there is no reasonable expectation that the cost of developing and making the product available in the U.S. for this type of disease or condition will be recovered from sales of the product.

Orphan drug designation must be requested before submitting an NDA or BLA. After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

If a product that has orphan drug designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same indication for seven years from the date of such approval, except in limited circumstances, such as a showing of clinical superiority to the product with orphan drug exclusivity by means of greater effectiveness, greater safety, provision of a major contribution to patient care, or in instances of drug supply issues. Competitors, however, may receive approval of either a different product for the same indication or the same product for a different indication but that could be used off-label in the orphan indication. Orphan drug exclusivity could also block the approval of one of our products for seven years if a competitor obtains approval before we do for the same product, as defined by the FDA, for the same indication we are seeking approval, or if our product is determined to be contained within the scope of the competitor’s product for the same indication or disease. If one of our products designated as an orphan drug receives marketing approval for an indication broader than that which is designated, it may not be entitled to orphan drug exclusivity. Orphan drug status in the European Union has similar, but not identical, requirements and benefits.

Expedited development and review programs

The FDA has a fast track program that is intended to expedite or facilitate the process for reviewing new drugs and biologics that meet certain criteria. Specifically, new drugs and biologics are eligible for fast track designation if they are intended to treat a serious or life-threatening disease or condition and preclinical or clinical data demonstrate the potential to address unmet medical needs for the condition. Fast track designation applies to both the product and the specific indication for which it is being studied. For a fast track-designated product, the FDA may consider sections of the NDA or BLA for review on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the application, the FDA agrees to accept sections of the application and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the application. The sponsor can request that the FDA designate the product for fast track status any

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time before receiving NDA or BLA approval, but ideally no later than the pre-NDA or pre-BLA meeting. Additionally, the FDA may rescind a fast track designation if it believes that the designation is no longer supported by data emerging in the clinical trial process.

Any product submitted to the FDA for marketing, including under a fast track program, may be eligible for other types of FDA programs intended to expedite development and review, such as priority review and accelerated approval. Any product is eligible for priority review if it treats a serious or life-threatening condition and, if approved, would provide a significant improvement in safety and effectiveness compared to available therapies. The FDA will attempt to direct additional resources to the evaluation of an application for a new drug or biologic designated for priority review in an effort to facilitate the review.

A product may also be eligible for accelerated approval if it is designed to treat a serious or life-threatening disease or condition and demonstrates an effect on either 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, or IMM, that is reasonably likely to predict an effect on IMM or other clinical benefit, taking into account the severity, rarity, or prevalence of the disease or condition and the availability or lack of alternative treatments. As a condition of approval, the FDA may require that a sponsor of a drug or biologic receiving accelerated approval perform adequate and well-controlled post-marketing clinical trials with due diligence, and, under the Food and Drug Omnibus Reform Act of 2022, or FDORA, the FDA is now permitted to require, as appropriate, that such trials be underway prior to approval or within a specific time period after the date accelerated approval is granted. Additionally, under FDORA, the FDA has increased authority for expedited procedures to withdraw approval of a drug or indication approved under accelerated approval if, for example, the confirmatory trial fails to verify the predicted clinical benefit of the product. In addition, the FDA currently requires, unless otherwise informed by the agency, pre-approval of promotional materials for products receiving accelerated approval, which could adversely impact the timing of the commercial launch of the product. Additionally, a drug or biologic may be eligible for designation as a breakthrough therapy if the product is intended, alone or in combination with one or more other drugs or biologics, to treat a serious or life-threatening condition and preliminary clinical evidence indicates that the product may demonstrate substantial improvement over currently approved therapies on one or more clinically significant endpoints. The benefits of breakthrough therapy designation include the same benefits as fast track designation plus intensive guidance from the FDA to ensure an efficient drug development program. The FDA may rescind the designation if the product candidate does not continue to meet the criteria for breakthrough therapy designation.

As part of the 21st Century Cures Act, Congress amended the FDCA to facilitate an efficient development program for, and expedite review of, regenerative medicine advanced therapies, or RMATs, which include cell and gene therapies, therapeutic tissue engineering products, human cell and tissue products, and combination products using any such therapies or products. RMATs do not include those human cells, tissues, and cellular and tissue based products regulated solely under section 361 of the PHSA and 21 CFR Part 1271. This program is intended to facilitate efficient development and expedite review of RMATs, which are intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition and for which preliminary clinical evidence indicates that the product candidate has the potential to address unmet medical needs for such disease or condition. A sponsor may request that the FDA designate a product candidate as an RMAT concurrently with, or at any time after, submission of an IND. The FDA has 60 calendar days to determine whether the product candidate meets the criteria, including whether there is preliminary clinical evidence indicating that the product candidate has the potential to address unmet medical needs for a serious or life-threatening disease or condition. A BLA for a regenerative medicine therapy that has received RMAT designation may be eligible for priority review or accelerated approval through use of surrogate or intermediate endpoints reasonably likely to predict long-term clinical benefit, or reliance upon data obtained from a meaningful number of sites. Benefits of RMAT designation also include early interactions with the FDA to discuss any potential surrogate or intermediate endpoint to be used to support accelerated approval. A product candidate with RMAT designation that is granted accelerated approval and is subject to post-approval requirements may fulfill such requirements through the submission of clinical evidence from clinical studies, patient registries, or other sources of real world evidence, such as electronic health records, the collection of larger confirmatory data sets, or post-approval monitoring of all patients treated with such therapy prior to its approval. The FDA may rescind RMAT designation if the product is no longer meeting the criteria for such designation.

Fast track designation, priority review, accelerated approval, breakthrough therapy designation, and RMAT designation do not change the standards for approval, but may expedite the development or approval process.

Pediatric information

Under the Pediatric Research Equity Act, or PREA, certain NDAs and BLAs and certain supplements to an NDA or BLA must contain data to assess the safety and efficacy 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 product is safe and effective. The FDA may grant deferrals for submission of pediatric data or full or partial waivers. The FDCA, as amended, requires that a sponsor who is planning to submit a marketing application for a drug that includes a new active ingredient, new indication, new dosage form, new dosing regimen, or new route of administration submit an initial Pediatric Study Plan, or PSP, within 60 days of an end-of-Phase 2 meeting or, if there is no such meeting, as early as practicable before the initiation of the Phase 3 or Phase 2/3 trial. The initial PSP must include an outline of the pediatric trial or trials that the sponsor plans to conduct, including study objectives and design, age groups,

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relevant endpoints and statistical approach, or a justification for not including such detailed information, and any request for a deferral of pediatric assessments or a full or partial waiver of the requirement to provide data from pediatric trials along with supporting information. The FDA and the sponsor must reach an agreement on the PSP. A sponsor can submit amendments to an agreed-upon initial PSP at any time if changes to the pediatric plan need to be considered based on data collected from preclinical studies, early phase clinical trials, and/or other clinical development programs.

Post-marketing requirements

Following approval of a new product, the manufacturer and the approved product are subject to continuing regulation by the FDA, including, among other things, monitoring and record-keeping activities, reporting of adverse experiences, complying with promotion and advertising requirements, which include restrictions on promoting drugs for unapproved uses or patient populations, or off-label use, and limitations on industry-sponsored scientific and educational activities. Although physicians may prescribe legally available drugs for off-label uses, manufacturers may not market or promote such uses. Prescription drug promotional materials must be submitted to the FDA in conjunction with their first use. Further, if there are any modifications to the drug or biologic, including changes in indications, labeling or manufacturing processes or facilities, the applicant may be required to submit and obtain FDA approval of a new NDA/BLA or NDA/BLA supplement, which may require the development of additional data or preclinical studies and clinical trials.

The FDA may also place other conditions on approvals including the requirement for a Risk Evaluation and Mitigation Strategy, or REMS, to assure the safe use of the product. If the FDA concludes a REMS is needed, the sponsor of the NDA or BLA must submit a proposed REMS. The FDA will not approve the NDA or BLA without an approved REMS, if required. A REMS could include medication guides, physician communication plans or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. Any of these limitations on approval or marketing could restrict the commercial promotion, distribution, prescription or dispensing of products. Product approvals may be withdrawn for non-compliance with regulatory standards or if problems occur following initial marketing or if the FDA determines that the product is no longer safe or effective.

FDA regulations require that products be manufactured in specific approved facilities and in accordance with cGMP regulations. We rely, and expect to continue to rely, on third parties for the production of clinical and commercial quantities of our products in accordance with cGMP regulations. These manufacturers must comply with cGMP regulations that require, among other things, quality control and quality assurance, the maintenance of records and documentation and the obligation to investigate and correct any deviations from cGMP. Manufacturers and other entities involved in the manufacture and distribution of approved drugs or biologics are required to register their establishments with the FDA and certain state agencies and are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with cGMP requirements and other laws. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to maintain cGMP compliance. The discovery of violative conditions, including failure to conform to cGMP regulations, could result in enforcement actions, and the discovery of problems with a product after approval may result in restrictions on a product, manufacturer or holder of an approved NDA or BLA, including recall.

Companion diagnostics and complementary diagnostics

We believe that the success of our product candidates may depend, in part, on the development and commercialization of either a companion diagnostic or complementary diagnostic. Companion diagnostics and complementary diagnostics can identify patients who are most likely to benefit from a particular therapeutic product; identify patients likely to be at increased risk for serious side effects as a result of treatment with a particular therapeutic product; or monitor response to treatment with a particular therapeutic product for the purpose of adjusting treatment to achieve improved safety or effectiveness. Companion diagnostics and complementary diagnostics are regulated as medical devices by the FDA and, as such, require either clearance or approval prior to commercialization. The level of risk combined with available controls to mitigate risk determines whether a companion diagnostic device requires Premarket Approval Application approval or is cleared through the 510(k) premarket notification process. For a novel therapeutic product for which a companion diagnostic device is essential for the safe and effective use of the product, the companion diagnostic device should be developed and approved or 510(k)-cleared contemporaneously with the therapeutic. The use of the companion diagnostic device will be stipulated in the labeling of the therapeutic product. This is also true for a complementary diagnostic, although it is not a prerequisite for receiving the therapeutic.

Other regulatory matters

Manufacturing, sales, promotion and other activities following product approval are also subject to regulation by numerous regulatory authorities in the U.S. in addition to the FDA, including the Centers for Medicare & Medicaid Services, or CMS, other divisions of the Department of Health and Human Services, or HHS, the Department of Justice, the Drug Enforcement Administration,

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the Consumer Product Safety Commission, the Federal Trade Commission, the Occupational Safety & Health Administration, the Environmental Protection Agency and state and local governments.

Healthcare providers, physicians, and third-party payors will play a primary role in the recommendation and prescription of any products for which we obtain marketing approval. Our future arrangements with third party payors, healthcare providers and physicians may expose 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 drugs for which we obtain marketing approval. In the U.S., these laws include: the federal Anti-Kickback Statute, the False Claims Act, laws and regulations related to the reporting of payments to physicians and teaching hospitals, and the Health Insurance Portability and Accountability Act of 1996, or HIPAA.

The Anti-Kickback Statute makes it illegal for any person, including a prescription drug manufacturer (or a party acting on its behalf), to knowingly and willfully solicit, receive, offer, pay or provide any remuneration, directly or indirectly, in cash or in kind, that is intended to induce or reward referrals, including the purchase, recommendation, order or prescription of a particular drug, for which payment may be made under a federal healthcare program, such as Medicare or Medicaid. Violations of this law are punishable by up to five years in prison, criminal fines, administrative civil money penalties for each violation, plus up to three times the renumeration involved, and exclusion from participation in federal healthcare programs. The government may also assert that a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for the purposes of the federal False Claims Act or federal civil monetary penalties. A person or entity does not need to have actual knowledge of the statute or specific intent to violate it.

The federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalty laws impose civil penalties, including through civil whistleblower or qui tam actions, against individuals or entities (including manufacturers) for, among other things, knowingly presenting or causing to be presented false or fraudulent claims for payment by a federal healthcare program or making a false statement or record material to payment of a false claim or avoiding, decreasing or concealing an obligation to pay money to the federal government. Penalties for a False Claims Act violation include three times the actual damages sustained by the government, plus mandatory civil penalties for each separate false claim, the potential for exclusion from participation in federal healthcare programs, and the potential implication of various federal criminal statutes. Manufacturers can be held liable under the federal False Claims Act even when they do not submit claims directly to government payors if they are deemed to “cause” the submission of false or fraudulent claims. The government may deem manufacturers to have “caused” the submission of false or fraudulent claims by, for example, providing inaccurate billing or coding information to customers or promoting a product off-label. Claims which include items or services resulting from a violation of the federal Anti-Kickback Statute are false or fraudulent claims for purposes of the False Claims Act. The federal False Claims Act also permits a private individual acting as a “whistleblower” to bring actions on behalf of the federal government alleging violations of the False Claims Act and to share in any monetary recovery. Our future marketing and activities relating to the reporting of wholesaler or estimated retail prices for our products, the reporting of prices used to calculate Medicaid rebate information and other information affecting federal, state and third-party reimbursement for our products, as well as the sale and marketing of our product and any future product candidates, are subject to scrutiny under this law.

HIPAA imposes criminal and civil liability for knowingly and willfully executing, or attempting to execute, a scheme to defraud any healthcare benefit program or knowingly and willfully making false statements, and concealing or covering up by any trick or device a material fact or making any materially false statement relating to healthcare matters. Similar to the federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation.

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009, or HITECH, and their implementing regulations, including the Final Omnibus Rule published in January 2013, also imposes obligations, including mandatory contractual terms and technical safeguards, with respect to maintaining the privacy, security and transmission of individually identifiable health information held by covered entities and their business associates. Among other things, HITECH makes HIPAA’s privacy and security standards directly applicable to “business associates,” those independent contractors or agents of covered entities that create, receive, maintain, transmit or obtain protected health information in connection with providing a service on behalf of a covered entity. HITECH also created new tiers of civil monetary penalties, amended HIPAA to make civil and criminal penalties directly applicable to business associates, 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 attorneys’ fees and costs associated with pursuing federal civil actions.

The Physician Payments Sunshine Act of 2010, as amended by the Health Care and Education Reconciliation Act, requires applicable manufacturers of covered drugs, biologics, and medical supplies (those paid for by a federal healthcare program) to report annually to CMS information related to any payments and other transfers of value made to physicians (defined to include doctors, dentists, optometrists, podiatrists and chiropractors), certain other licensed health care practitioners and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members.

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Federal government price reporting laws require us to calculate and report complex pricing metrics in an accurate and timely manner to government programs. Additionally, federal consumer protection and unfair competition laws broadly regulate marketplace activities and activities that potentially harm consumers.

Analogous state and foreign fraud and abuse 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. Such laws are generally broad and are enforced by various state agencies and private actions. Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant federal government compliance guidance and require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures. Several states also impose other marketing restrictions or require pharmaceutical companies to make marketing or price disclosures to the state and require the registration of pharmaceutical sales representatives.

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 pre-empted by HIPAA, thus complicating compliance efforts. For example, in California, the California Consumer Protection Act, or CCPA, which went into effect on January 1, 2020, establishes a new privacy framework for covered businesses by creating an expanded definition of personal information, establishing new data privacy rights for consumers in the State of California, imposing special rules on the collection of consumer data from minors, and creating a new and potentially severe statutory damages framework for violations of the CCPA and for businesses that fail to implement reasonable security procedures and practices to prevent data breaches. Further, the CCPA creates a private right of action for certain data breaches that result in the loss of personal information of California residents, and this private right of action may increase the likelihood of, and risks associated with, data breach litigation. Currently, clinical trial data and information governed by HIPAA are exempt from the current version of the CCPA, but possible changes to the CCPA may broaden its scope. In addition, a new California ballot initiative, the California Privacy Rights Act, or CPRA, was passed in November 2020 and became effective on January 1, 2023. The amendments to the CCPA introduced by the CPRA impose additional obligations on covered businesses and enhances the protections provided for by the CCPA, including by expanding consumers’ rights with respect to certain sensitive personal information. The changes introduced by the CPRA also create a new state agency that will be vested with authority to implement and enforce the CCPA. Similar laws have been proposed, and likely will be proposed, in other states and at the federal level, and if passed, such laws may have potentially conflicting requirements that would make compliance challenging. For example, on March 2, 2021, the Virginia Consumer Data Protection Act, or CDPA, was signed into law. This new measure which became effective January 1, 2023 contains provisions that, in addition to other mandates, require businesses subject to the legislation to conduct data protection assessments in certain circumstances and that require opt-in consent from Virginia consumers to process certain sensitive personal information. Further data privacy and security laws and regulations in foreign jurisdictions may be more stringent than those in the U.S. (such as the European Union, which adopted the GDPR, which became effective in May 2018). Analogous state laws may additionally 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.

Pricing and rebate programs must comply with the Medicaid rebate requirements of the U.S. Omnibus Budget Reconciliation Act of 1990 and more recent requirements in the Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively the ACA. If products are made available to authorized users of the Federal Supply Schedule of the General Services Administration, additional laws and requirements apply. Products must meet applicable child-resistant packaging requirements under the U.S. Poison Prevention Packaging Act. Manufacturing, sales, promotion and other activities also are potentially subject to federal and state consumer protection and unfair competition laws.

Current and Future Legislation

In the U.S. and foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability to profitably sell any product candidates for which we obtain marketing approval. We expect that current laws, 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, or any collaborators, may receive for any approved products.

In 2010, the Congress enacted the ACA, which, among other things:

created an annual, nondeductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic products, apportioned among these entities according to their market share in certain government healthcare programs;

expanded eligibility criteria for Medicaid programs, thereby potentially increasing a manufacturer’s Medicaid rebate liability;

expanded manufacturers’ rebate liability under the Medicaid Drug Rebate Program;

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expanded the types of entities eligible for the 340B drug discount program;

established the Medicare Part D coverage gap discount program by requiring manufacturers to provide a 70% point-of-sale-discount off the negotiated price of applicable brand drugs to eligible beneficiaries during their coverage gap period as a condition for the manufacturers’ outpatient drugs to be covered under Medicare Part D; and

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

In addition, other legislative and regulatory changes have been proposed and adopted in the United States since the ACA was enacted:

The Budget Control Act of 2011 and subsequent legislation, among other things, created measures for spending reductions by Congress that include aggregate reductions of Medicare payments to providers of 2% per fiscal year, which remain in effect through 2031. Due to the Statutory Pay-As-You-Go Act of 2010, estimated budget deficit increases resulting from the American Rescue Plan Act of 2021, and subsequent legislation, Medicare payments to providers will be further reduced starting in 2025 absent further legislation.

The U.S. American Taxpayer Relief Act of 2012 further reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years.

The Drug Supply Chain Security Act imposes new obligations on manufacturers of pharmaceutical products related to product tracking and tracing. Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional activities for pharmaceutical products. We are not sure whether additional legislative changes will be enacted, or whether the current regulations, guidance or interpretations will be changed, or what the impact of such changes on our business, if any, may be.

On April 13, 2017, CMS published a final rule that gives states greater flexibility in setting benchmarks for insurers in the individual and small group marketplaces, which may have the effect of relaxing the essential health benefits required under the ACA for plans sold through such marketplaces.

In addition, on May 30, 2018, the Right to Try Act was signed into law. The Right to Try Act, 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 permission under the FDA expanded access program. There is no obligation for a pharmaceutical manufacturer to make its drug products available to eligible patients as a result of the Right to Try Act.

On May 23, 2019, CMS published a final rule to allow Medicare Advantage Plans the option of using step therapy for Part B drugs beginning January 1, 2020.

Additionally, there has been increasing legislative and enforcement interest in the United States with respect to drug pricing practices. Specifically, there has been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products, which has resulted in several U.S. Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to drug pricing, reduce the cost of prescription drugs under Medicare, and review the relationship between pricing and manufacturer patient programs. The Inflation Reduction Act of 2022, or IRA includes several provisions that may impact our business to varying degrees, including provisions that reduce the out-of-pocket spending cap for Medicare Part D beneficiaries from $7,050 to $2,000 starting in 2025, thereby effectively eliminating the coverage gap; impose new manufacturer financial liability on certain drugs under Medicare Part D, allow the U.S. government to negotiate Medicare Part B and Part D price caps for certain high-cost drugs and biologics without generic or biosimilar competition; require companies to pay rebates to Medicare for certain drug prices that increase faster than inflation; and delay until January 1, 2032 the implementation of the HHS rebate rule that would have limited the fees that pharmacy benefit managers can charge. Further, under the IRA, orphan drugs are exempted from the Medicare drug price negotiation program, but only if they have one rare disease designation and for which the only approved indication is for that disease or condition. If a product receives multiple rare disease designations or has multiple approved indications, it may not qualify for the orphan drug exemption. The effects of the IRA on our business and the healthcare industry in general is not yet known.

President Biden has also issued multiple executive orders that have sought to reduce prescription drug costs. In February 2023, HHS also issued a proposal in response to an October 2022 executive order from President Biden that includes a proposed prescription drug pricing model that will test whether targeted Medicare payment adjustments will sufficiently incentivize manufacturers to complete confirmatory trials for drugs approved through FDA’s accelerated approval pathway. Although a number of these and other proposed measures may require authorization through additional legislation to become effective, and the Biden administration may

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reverse or otherwise change these measures, both the Biden administration and Congress have indicated that they will continue to seek new legislative measures to control drug costs.

At the state level, legislatures have become increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing. Some of these measures include price or patient reimbursement constraints, discounts, restrictions on certain product access, marketing cost disclosure and transparency measures, and, in some cases, measures designed to encourage importation from other countries and bulk purchasing. In addition, regional health care authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other health care programs.

These laws, and future state and federal healthcare reform measures may be adopted in the future, any of which may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used.

Packaging and Distribution in the U.S.

If our products are made available to authorized users of the Federal Supply Schedule of the General Services Administration, additional laws and requirements apply. Products must meet applicable child-resistant packaging requirements under the U.S. Poison Prevention Packaging Act. Manufacturing, sales, promotion and other activities also are potentially subject to federal and state consumer protection and unfair competition laws.

The distribution of pharmaceutical products is subject to additional requirements and regulations, including extensive record-keeping, licensing, storage and security requirements intended to prevent the unauthorized sale of pharmaceutical products. Manufacturers and other parties involved in the drug supply chain for prescription drug products must also comply with product tracking and tracing requirements and requirements to notify the FDA of counterfeit, diverted, stolen and intentionally adulterated products or products that are otherwise unfit for distribution in the U.S.

The failure to comply with any of these laws or regulatory requirements subjects firms to possible legal or regulatory action. Depending on the circumstances, failure to meet applicable regulatory requirements can result in criminal prosecution, fines or other penalties, injunctions, exclusion from federal healthcare programs, requests for recall, seizure of products, total or partial suspension of production, denial or withdrawal of product approvals, or refusal to allow a firm to enter into supply contracts, including government contracts. Any action against us for violation of these laws, even if we successfully defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business. Prohibitions or restrictions on sales or withdrawal of future products marketed by us could materially affect our business in an adverse way.

Changes in regulations, statutes or the interpretation of existing regulations could impact our business in the future by requiring, for example: (i) changes to our manufacturing arrangements; (ii) additions or modifications to product labeling; (iii) the recall or discontinuation of our products; or (iv) additional record-keeping requirements. If any such changes were to be imposed, they could adversely affect the operation of our business.

Other U.S. environmental, health and safety laws and regulations

We may be 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. From time to time and in the future, our operations may involve the use of hazardous and flammable materials, including chemicals and biological materials, and may also produce hazardous waste products. Even if we contract with third parties for the disposal of these materials and waste products, we cannot completely eliminate the risk of contamination or injury resulting from these materials. In the event of contamination or injury resulting from the use or disposal of our 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.

We maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees, but this insurance may not provide adequate coverage against potential liabilities. However, we do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us.

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

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U.S. patent term restoration and marketing exclusivity

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

Marketing exclusivity provisions under the FDCA also can delay the submission or the approval of certain applications. The FDCA provides a five-year period of non-patent marketing exclusivity within the U.S. to the first applicant to gain approval of an NDA for a new chemical entity. A drug is a new chemical entity if the FDA has not previously approved any other new drug containing the same active moiety, which is the molecule or ion responsible for the action of the drug substance. During the exclusivity period, the FDA may not accept for review an abbreviated new drug application, or ANDA, or a 505(b)(2) NDA submitted by another company for another version of such drug where the applicant does not own or have a legal right of reference to all the data required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or non-infringement. The FDCA also provides three years of marketing exclusivity for an NDA, 505(b)(2) NDA or supplement to an existing NDA if new clinical investigations, other than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for example, new indications, dosages or strengths of an existing drug. This three-year exclusivity covers only the conditions of use associated with the new clinical investigations and does not prohibit the FDA from approving ANDAs for drugs containing the original active agent. Five-year and three-year exclusivity will not delay the submission or approval of a full NDA. However, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to all of the preclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness.

An abbreviated approval pathway for biological products shown to be similar to, or interchangeable with, an FDA-licensed reference biological product was created by the Biologics Price Competition and Innovation Act of 2009 as part of the ACA. This amendment to the PHSA, in part, attempts to minimize duplicative testing. Biosimilarity, which requires that the biological product be highly similar to the reference product notwithstanding minor differences in clinically inactive components and that there be no clinically meaningful differences between the product and the reference product in terms of safety, purity and potency, can be shown through analytical studies, animal studies and a clinical trial or trials. Interchangeability requires that a biological product be biosimilar to the reference product and that the product can be expected to produce the same clinical results as the reference product in any given patient and, for products administered multiple times to an individual, that the product and the reference product may be alternated or switched after one has been previously administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biological product without such alternation or switch. Complexities associated with the larger, and often more complex, structure of biological products as compared to small molecule drugs, as well as the processes by which such products are manufactured, pose significant hurdles to implementation that are still being worked out by the FDA.

A reference biological product is granted four and twelve year exclusivity periods from the time of first licensure of the product. The FDA will not accept an application for a biosimilar or interchangeable product based on the reference biological product until four years after the date of first licensure of the reference product, and the FDA will not approve an application for a biosimilar or interchangeable product based on the reference biological product until twelve years after the date of first licensure of the reference product. “First licensure” typically means the initial date the particular product at issue was licensed in the U.S. Date of first licensure does not include the date of licensure of (and a new period of exclusivity is not available for) a biological product if the licensure is for a supplement for the biological product or for a subsequent application by the same sponsor or manufacturer of the biological product (or licensor, predecessor in interest, or other related entity) for a change (not including a modification to the structure of the biological product) that results in a new indication, route of administration, dosing schedule, dosage form, delivery system, delivery device or strength, or for a modification to the structure of the biological product that does not result in a change in safety, purity, or potency. Therefore, one must determine whether a new product includes a modification to the structure of a previously licensed product that results in a change in safety, purity, or potency to assess whether the licensure of the new product is a first licensure that triggers its own period of exclusivity. Whether a subsequent application, if approved, warrants exclusivity as the “first licensure” of a biological product is determined on a case-by-case basis with data submitted by the sponsor. In addition, the first biologic submitted under the abbreviated approval pathway that is determined to be interchangeable with the reference product is eligible for a period of exclusivity against other biologics submitted under the abbreviated approval pathway during which time the FDA may not determine that another

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product is interchangeable with the same reference product for any condition of use. The FDA may approve multiple “first” interchangeable products so long as they are all approved on the same first day of marketing. This exclusivity period, which may be shared amongst multiple first interchangeable products, lasts for the lesser of (i) one year after the first commercial marketing, (ii) 18 months after approval if there is no legal challenge, (iii) 18 months after the resolution in the applicant’s favor of a lawsuit challenging the biologic’s patents if an application has been submitted, or (iv) 42 months after the application has been approved if a lawsuit is ongoing within the 42-month period.

Pediatric exclusivity is another type of regulatory marketing exclusivity in the U.S. Pediatric exclusivity, if granted, adds six months to existing regulatory exclusivity periods. This six-month exclusivity may be granted based on the voluntary completion of a pediatric trial in accordance with an FDA-issued “Written Request” for such a trial.

European Union drug development

In the European Union, our future products also may be subject to extensive regulatory requirements. As in the U.S., medicinal products can be marketed only if a marketing authorization from the competent regulatory agencies has been obtained.

In April 2014, the European Union adopted a new Clinical Trials Regulation (EU) No 536/2014, which replaced the previous Clinical Trials Directive 2001/20/EC on January 31, 2022. It overhauls the previous system of approvals for clinical trials in the European Union, and is aimed at harmonizing and streamlining clinical-trial authorization (for example, by providing for a streamlined application procedure via a single entry point and strictly defined deadlines for the assessment of clinical trial applications), simplifying adverse-event reporting procedures, improving the supervision of clinical trials and increasing their transparency. The new Clinical Trials Regulation also ensures that the rules for conducting clinical trials in the European Union will be identical, as no national implementing legislation in each European Union Member State will be required.

European Union drug marketing

Much like the Anti-Kickback Statute prohibition in the U.S., the provision of benefits or advantages to physicians to induce or encourage the prescription, recommendation, endorsement, purchase, supply, order or use of medicinal products is also prohibited in the European Union and the United Kingdom, or U.K. The provision of benefits or advantages to induce or reward improper performance generally is typically governed by the national anti-bribery laws of European Union Member States, and the Bribery Act 2010 in the U.K. Infringement of these laws could result in substantial fines and imprisonment. European Union Directive 2001/83/EC, which is the European Union Directive governing medicinal products for human use, further provides that, where medicinal products are being promoted to persons qualified to prescribe or supply them, no gifts, pecuniary advantages or benefits in kind may be supplied, offered or promised to such persons unless they are inexpensive and relevant to the practice of medicine or pharmacy. This provision has been transposed into the Human Medicines Regulations 2012 and so remains applicable in the U.K. despite its departure from the European Union.

Payments made to physicians in certain European Union Member States must be publicly disclosed. Moreover, agreements with physicians often must be the subject of prior notification and approval by the physician’s employer, his or her competent professional organization and/or the regulatory authorities of the individual European Union Member States. These requirements are provided in the national laws, industry codes or professional codes of conduct, applicable in the European Union Member States. Failure to comply with these requirements could result in reputational risk, public reprimands, administrative penalties, fines or imprisonment.

European Union drug review and approval

In the European Union, medicinal products can only be commercialized after obtaining a marketing authorization, or MA. There are two types of marketing authorizations.

The centralized MA is issued by the European Commission, or EC, through the centralized procedure, based on the opinion of the Committee for Medicinal Products for Human Use, or CHMP, of the EMA and is valid throughout the European Union and in the additional Member States of the European Economic Area, or EEA (Iceland, Norway and Liechtenstein). The centralized procedure is mandatory for certain types of products, such as biotechnology medicinal products, orphan medicinal products, advanced-therapy medicines (gene-therapy, somatic cell-therapy or tissue-engineered medicines) and medicinal products containing a new active substance indicated for the treatment of HIV, AIDS, cancer, neurodegenerative disorders, diabetes, auto-immune and other immune dysfunctions and viral diseases. The centralized procedure is optional for products containing a new active substance not yet authorized in the European Union, or for products that constitute a significant therapeutic, scientific or technical innovation or which are in the interest of public health in the European Union. Under the centralized procedure the maximum timeframe for the evaluation of a marketing authorization application, or MAA, by the EMA is 210 days, excluding clock stops, when additional written or oral information is to be provided by the applicant in response to questions asked by the CHMP.

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Clock stops may extend the timeframe of evaluation of an MAA considerably beyond 210 days. Where the CHMP gives a positive opinion, it provides the opinion together with supporting documentation to the EC making the final decision to grant a marketing authorization, which is issued within 67 days of receipt of the EMA’s recommendation. Accelerated assessment might be granted by the CHMP in exceptional cases, when a medicinal product is expected to be of major public health interest, particularly from the point of view of therapeutic innovation. The timeframe for the evaluation of an MAA under the accelerated assessment procedure is 150 days, excluding clock stops, but it is possible that the CHMP may revert to the standard time limit for the centralized procedure if it determines that the application is no longer appropriate to conduct an accelerated assessment.

National MAs, which are issued by the competent authorities of the European Union Member States and only cover their respective territory, are available for products not falling within the mandatory scope of the centralized procedure. Where a product has already been authorized for marketing in a European Union Member State, this national MA can be recognized in other European Union Member States through the mutual recognition procedure. If the product has not received a national MA in any European Union Member State at the time of application, it can be approved simultaneously in various European Union Member States through the decentralized procedure. Under the decentralized procedure an identical dossier is submitted to the competent authorities of each of the European Union Member States in which an MA is sought, one of which is selected by the applicant as the Reference Member State, or RMS. The competent authority of the RMS prepares a draft assessment report, a draft summary of product characteristics, or SmPC, and a draft of the labeling and package leaflet, which are sent to the other European Union Member States (referred to as the Concerned Member States) for their approval. If the Concerned Member States raise no objections, based on a potential serious risk to public health, to the assessment, SmPC, labeling, or packaging proposed by the RMS, the product is subsequently granted a national MA in all the European Union Member States (i.e., in the RMS and the Concerned Member States).

Under the above described procedures, before granting a MA, the EMA or the competent authorities of the European Union Member States make an assessment of the risk-benefit balance of the product on the basis of scientific criteria concerning its quality, safety and efficacy.

Now that the U.K. (which comprises Great Britain and Northern Ireland) has left the European Union, Great Britain is no longer covered by centralized MAs (under the Northern Ireland Protocol, centralized MAs continue to be recognized in Northern Ireland for the time being). All medicinal products with an existing centralized MA were automatically converted to Great Britain MAs on January 1, 2021. For a period of three years from January 1, 2021, the Medicines and Healthcare products Regulatory Agency, or MHRA, the U.K. medicines regulator, may rely on a decision taken by the EC on the approval of a new MA in the centralized procedure, in order to more quickly grant a new Great Britain MA. A separate application will, however, still be required. On January 24, 2023, the MHRA announced that a new international recognition framework will be put in place from January 1, 2024, which will have regard to decisions on the approval of MAs made by the European Medicines Agency and certain other regulators. The MHRA also has the power to have regard to MAs approved in the European Union Member States through decentralized or mutual recognition procedures with a view to more quickly granting an MA in the U.K. or Great Britain.

European Union market and data exclusivity

In the European Union, innovative medicinal products qualify for eight years of data exclusivity upon marketing authorization and an additional two years of market exclusivity. The data exclusivity, if granted, prevents generic or biosimilar applicants from referencing the innovator’s pre-clinical and clinical trial data contained in the dossier of the reference product when applying for a generic or biosimilar MA in the European Union. During the additional two-year period of market exclusivity, a generic or biosimilar MAA can be submitted, and the innovator’s data may be referenced, but no generic or biosimilar product can be marketed until the expiration of the market exclusivity. The overall ten-year period will be extended to a maximum of 11 years if, during the first eight years of those ten years, the MA holder obtains an authorization for one or more new therapeutic indications which, during the scientific evaluation prior to their authorization, are determined to bring a significant clinical benefit in comparison with currently approved therapies. Even if a compound is considered to be a new chemical entity so that the innovator gains the prescribed period of data exclusivity, another company may market another version of the product if such company obtained MA based on an MAA with a complete and independent data package of pharmaceutical tests, preclinical tests and clinical trials.

European Union orphan designation and exclusivity

In the European Union, the EMA’s Committee for Orphan Medicinal Products may grant orphan designation in respect of products that are intended for the diagnosis, prevention or treatment of life-threatening or chronically debilitating conditions and either (i) such condition affects not more than 5 in 10,000 persons in the European Union or (ii) it is unlikely that the development of the medicine would generate sufficient return to justify the necessary investment in its development. In either case, the applicant must also

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demonstrate that no satisfactory method of diagnosis, prevention or treatment for the condition has been authorized (or, if such a method exists, the product would be a significant benefit to those affected compared to the product available).

In the European Union, orphan designation entitles a party to financial incentives such as reduction of fees or fee waivers and ten years of market exclusivity is granted following medicinal product approval. During this market exclusivity period, neither the EMA nor the EC nor any of the competent authorities in the European Union Members States can accept an application or grant a marketing authorization for a “similar medicinal product.” A “similar medicinal product” is defined as a medicinal product containing a similar active substance or substances as contained in an authorized orphan medicinal product, and which is intended for the same therapeutic indication. This period may be reduced to six years if the orphan designation criteria are no longer met, including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity. A marketing authorization may be granted to a similar medicinal product to an authorized orphan product during the market exclusivity period in very select cases, such as if (i) it is established that the similar medicinal product is safer, more effective or otherwise clinically superior to the authorized orphan product; (ii) the marketing authorization holder for the authorized orphan product consents to the similar medicinal product authorization; or (iii) the marketing authorization holder for the authorized orphan product cannot supply enough orphan medicinal product. Orphan designation must be requested before submitting an application for marketing approval. Orphan designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

Since January 1, 2021, a separate process for orphan designation has applied in Great Britain. There is no pre-marketing authorization orphan designation (as there is in the European Union) and the application for orphan designation is reviewed by the MHRA, at the time of the marketing authorization application. The criteria are the same as in the European Union, save that they apply to Great Britain only (e.g., there must be no satisfactory method of diagnosis, prevention or treatment of the condition concerned in Great Britain).

The aforementioned European Union rules are generally applicable in the EEA.

Brexit and the Regulatory Framework in the U.K.

The U.K. formally left the European Union on January 31, 2020, and the European Union and the U.K. have concluded a trade and cooperation agreement, or TCA, which was provisionally applicable since January 1, 2021 and has been formally applicable since May 1, 2021. The TCA includes specific provisions concerning pharmaceuticals, which include the mutual recognition of good manufacturing practice, inspections of manufacturing facilities for medicinal products and good manufacturing practice documents issued, but does not provide for wholesale mutual recognition of U.K. and European Union pharmaceutical regulations. At present, Great Britain has implemented European Union legislation on the marketing, promotion and sale of medicinal products through the Human Medicines Regulations 2012 (as amended) (under the Northern Ireland Protocol, the European Union regulatory framework will continue to apply in Northern Ireland). The regulatory regime in Great Britain therefore aligns in many ways with European Union regulations, however it is possible that these regimes will diverge more significantly in future now that Great Britain’s regulatory system is independent from the European Union and the TCA does not provide for mutual recognition of U.K. and European Union pharmaceutical legislation. However, notwithstanding that there is no wholesale recognition of European Union pharmaceutical legislation under the TCA, under the new framework mentioned above which will be put in place by the MHRA from January 1, 2024, the MHRA has stated that it will take into account decisions on the approval of MAs from the EMA (and certain other regulators) when considering an application for a Great Britain MA. On February 27, 2023, the UK government and the European Commission announced a political agreement in principle to replace the Northern Ireland Protocol with a new set of arrangements, known as the “Windsor Framework.” This new framework fundamentally changes the existing system under the Northern Ireland Protocol, including with respect to the regulation of medicinal products in the U.K. In particular, the MHRA will be responsible for approving all medicinal products destined for the U.K. market (Great Britain and Northern Ireland), and the EMA will no longer have any role in approving medicinal products destined for Northern Ireland. A single U.K.-wide marketing authorization will be granted by the MHRA for all medicinal products to be sold in the UK, enabling products to be sold in a single pack and under a single authorization throughout the U.K.. Once the Windsor Framework is approved by the EU-UK Joint Committee, the U.K. Government and the European Union will enact legislative measures to enact it into law.

European and United Kingdom Data Collection

The collection and use of personal health data in the European Union is governed, as of May 2018, by the General Data Protection Regulation, or GDPR. The GDPR imposes several requirements on companies that process personal data, including requirements relating to the processing of health and other sensitive data, the consent of the individuals to whom the personal data relates, the information provided to the individuals regarding data processing activities, the notification of data processing obligations to the competent national data protection authorities and certain measures to be taken when engaging third-party processors. The GDPR also imposes strict rules on the transfer of personal data out of the EEA, including to the U.S. Failure to comply with the requirements of the GDPR, and the related national data protection laws of the European Union Member States, may result in fines and other administrative penalties, including potential fines of up to €20 million or 4% of annual global revenues, whichever is

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Source: SEC EDGAR (public domain) · 10-K for the period ended 2022-12-31, filed 2023-03-23 · accession 0000950170-23-009331

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