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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

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Larimar Therapeutics, Inc.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

PRELIMINARY COPY SUBJECT TO COMPLETION DATED APRIL 10, 2026

In accordance with Rule 14a-6(d) under Regulation 14A, please be advised that Larimar Therapeutics, Inc. intends to release definitive copies of this Proxy Statement to security holders on or about April , 2026.

Three Bala Plaza East, Suite 506

Bala Cynwyd, PA 19004

2026 ANNUAL MEETING OF STOCKHOLDERS

To be Held on May 19, 2026

April , 2026

Dear Stockholders:

We are pleased to invite you to attend the 2026 Annual Meeting of Stockholders of Larimar Therapeutics, Inc. (the “Annual Meeting”), which will be held at 8:00 a.m., Eastern Time, on Tuesday, May 19, 2026. The Annual Meeting will be held in a virtual meeting format only. Stockholders will not be able to attend the Annual Meeting physically. We believe that the virtual meeting format enables stockholders to attend and participate from any location around the world at no cost, provides for cost savings to Larimar Therapeutics, Inc. (the “Company”) and reduces the environmental impact of our Annual Meeting. The Annual Meeting can be accessed via the Internet at: meetnow.global/MWXPCMG.

Details regarding the business to be conducted at the Annual Meeting are more fully described in the accompanying Notice of 2026 Annual Meeting of Stockholders (the “Notice”) and 2026 Annual Meeting Proxy Statement (the “Proxy Statement”). Other than the proposals described in the Proxy Statement, the Board of Directors is not aware of any other matters to be presented for a vote at the Annual Meeting.

Your vote is important. Whether or not you plan to virtually attend the Annual Meeting, we encourage you to vote as soon as possible to ensure that your shares are represented. Information about voting methods is set forth in the accompanying Notice and Proxy Statement.

If you have any questions with respect to voting, please call our Chief Financial Officer and Secretary, Michael Celano, at 484-414-2715.

Thank you for your continued confidence in our Company. We look forward to your participation at the meeting.

Sincerely,

THIS PROXY STATEMENT AND ENCLOSED PROXY CARD ARE

FIRST BEING MAILED ON OR ABOUT APRIL , 2026.

NOTICE OF 2026 ANNUAL MEETING OF STOCKHOLDERS

To be Held on May 19, 2026

Dear Stockholders:

NOTICE IS HEREBY GIVEN that the 2026 Annual Meeting of Stockholders of Larimar Therapeutics, Inc. (the “Annual Meeting”) will be held as a virtual meeting on Tuesday, May 19, 2026, at 8:00 a.m. Eastern Time. We are holding the meeting for the purpose of considering and acting upon the:

The foregoing items of business are more fully described in the Proxy Statement accompanying this Notice of 2026 Annual Meeting of Stockholders (the “Notice”).

MEETING INFORMATION

Your vote matters. Whether or not you plan to virtually attend the Annual Meeting, please ensure that your shares are represented by voting, signing, dating, and returning your proxy in the enclosed envelope, which requires no postage if mailed in the United States.

Thank you for your ongoing support of and interest in Larimar Therapeutics, Inc.

IMPORTANT NOTICE REGARDING AVAILABILITY OF PROXY MATERIALS. This Proxy Statement and the proxy card are being mailed to our stockholders on or about April , 2026. In accordance with the rules of the Securities and Exchange Commission, we are advising our stockholders of the availability on the Internet of our proxy materials related to our

forthcoming Annual Meeting. Because we have elected to utilize the “full set delivery” option, we are delivering to all stockholders paper copies of all of the proxy materials, as well as providing access to those proxy materials on a publicly accessible website. This Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 are available to beneficial holders of our common stock at http://www.edocumentview.com/LRMR and to record holders of our common stock at http://www.envisionreports.com/LRMR.

To assist you in reviewing this year’s proposals, we call your attention to the following proxy summary. This summary highlights information contained elsewhere in this Proxy Statement and our Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “2025 Annual Report”). This summary does not contain all of the information you should consider, and we encourage you to read this Proxy Statement and the 2025 Annual Report carefully before voting.

2026 Annual Meeting of Stockholders

Summary of Stockholder Voting Matters

Our Director Nominees

You are being asked to vote on the election of Frank Thomas, Carole S. Ben-Maimon, M.D. and Joseph Truitt as Class III directors, each to serve for a three-year term expiring at our 2029 Annual Meeting of Stockholders. The number of members of our Board of Directors (the “Board”) is currently set at six members and is divided into three classes, each of which has a three-year term. Class I consists of two directors, Class II consists of one director and Class III consists of three directors.

The term of office of our Class III directors expires at the Annual Meeting. We are nominating Frank Thomas, Carole S. Ben-Maimon, M.D. and Joseph Truitt for at the Annual Meeting to serve until the 2029 Annual Meeting of Stockholders and until their successors, if any, are duly elected and qualified or appointed, or until their earlier death, resignation or removal. Directors are elected

by a plurality of the votes cast by our stockholders at the Annual Meeting. The nominees receiving the highest number of FOR votes (among votes properly cast online during the Annual Meeting or by proxy) will be elected. If no contrary indication is made, shares

represented by executed proxies will be voted FOR the election of Mr. Thomas, Dr. Ben-Maimon and Mr. Truitt. Each nominee has agreed to serve as a director if elected, and we have no reason to believe that any nominee will be unable to serve.

CORPORATE GOVERNANCE HIGHLIGHTS

The following table summarizes our current Board structure and key elements of our corporate governance framework:

RECENT CORPORATE HIGHLIGHTS

This Proxy Statement, with the enclosed proxy card, is being furnished to stockholders of Larimar Therapeutics, Inc. (the “Company”) in connection with the solicitation by our Board of proxies to be voted at our Annual Meeting and at any postponements or adjournments thereof. The Annual Meeting will be held on Tuesday, May 19, 2026, at 8:00 a.m., Eastern Time via the Internet at meetnow.global/MWXPCMG.

Attending the Annual Meeting

The Annual Meeting will be conducted virtually via live webcast, and there will not be a physical meeting location. We have adopted a virtual format for the Annual Meeting to provide a consistent experience to all stockholders regardless of location. We have designed the Annual Meeting to provide substantially the same opportunities to participate as you would have at an in-person meeting, including the ability to vote.

To participate in the virtual meeting, visit meetnow.global/MWXPCMG. You will need to enter the 16-digit control number included on your Notice or on your proxy card. The meeting will begin promptly at 8:00 a.m., Eastern Time on Tuesday, May 19, 2026. We encourage you to access the meeting prior to the start time leaving ample time for the check in.

If your shares are held in “street name,” you should contact your bank or broker to obtain your 16-digit control number or otherwise vote through the bank or broker. If you lose your 16-digit control number, you may join the Annual Meeting as a “Guest” but you will not be able to vote, ask questions or access the list of stockholders as of the Record Date.

The virtual meeting platform is fully supported across browsers (Internet Explorer, Firefox, Chrome and Safari) and devices (desktops, laptops, tablets and cell phones) running the most updated version of applicable software and plugins. You should ensure that you have a strong WiFi connection wherever you intend to participate in the meeting. You should also give yourself plenty of time to log in prior to the start of the meeting.

Proxy Solicitation

Our Board is soliciting your vote on matters that will be presented at the Annual Meeting and at any adjournment or postponement thereof. This Proxy Statement contains information on these matters to assist you in voting your shares.

This Proxy Statement and the proxy card are first being mailed to our stockholders on or about April , 2026. In accordance with the rules of the Securities and Exchange Commission (the “SEC”), we are advising our stockholders of the availability on the Internet of our proxy materials related to our forthcoming Annual Meeting. Because we have elected to utilize the “full set delivery” option, we are delivering to all stockholders paper copies of all of the proxy materials, as well as providing access to those proxy materials on a publicly accessible website. This Proxy Statement and our 2025 Annual Report are available to beneficial holders of our common stock at http://www.edocumentview.com/LRMR and to record holders of our common stock at http://www.envisionreports.com/LRMR.

Stockholders Entitled to Vote

All stockholders of record of our common stock at the close of business on March 25, 2026 (the “Record Date”) are entitled to receive the Notice and to vote their shares at the Annual Meeting. As of the Record Date, 103,882,937 shares of our common stock were outstanding. Each share is entitled to one vote on each matter properly brought to the meeting.

Voting Methods

You may cast your vote in any of the following ways:

How Your Shares Will Be Voted

In each case, your shares will be voted as you instruct. If you return a signed card, but do not provide voting instructions, your shares will be voted FOR each of the proposals. If you are the record holder of your shares, you may revoke or change your vote any time before the proxy is exercised. To do so, you must do one of the following:

If your shares are held by your broker, bank or other holder of record as a nominee or agent (i.e., the shares are held in “street name”), and you wish to vote at the Annual Meeting, you should follow the instructions provided by your broker, bank or other holder of record in order to obtain a proxy form from the institution that holds your shares.

Deadline for Voting. The deadline for voting by telephone or Internet, other than by virtually attending the Annual Meeting, is 11:59 p.m. Eastern Time on May 18, 2026. If you are a registered stockholder and virtually attend the Annual Meeting, you may deliver your vote online during the Annual Meeting.

Broker Voting and Votes Required for Each Proposal

If your shares are held in a stock brokerage account or by a bank or other holder of record, you are considered the “beneficial owner” of shares held in street name. The Notice has been forwarded to you by your broker, bank or other holder of record who is considered the stockholder of record of those shares. As the beneficial owner, you may direct your broker, bank or other holder of record on how to vote your shares by using the proxy card included in the materials made available or by following their instructions for voting on the Internet.

A broker non-vote occurs when a broker or other nominee that holds shares for another does not vote on a particular item because the nominee does not have discretionary voting authority for that item and has not received instructions from the beneficial owner of the shares. The following table summarizes how broker non-votes and abstentions are treated with respect to our proposals:

Quorum

We must have a quorum to conduct business at the Annual Meeting. A quorum consists of the presence at the Annual Meeting, either attending the meeting virtually or represented by proxy, of the holders of a majority of the outstanding shares of our common stock entitled to vote. For the purpose of establishing a quorum, abstentions, including brokers holding customers’ shares of record who cause abstentions to be recorded at the meeting, and broker non-votes are considered stockholders who are present and entitled to vote, and count toward the quorum. If there is no quorum, the holders of a majority of shares virtually attending the Annual Meeting or represented by proxy or the presiding officer of the meeting may adjourn the Annual Meeting to another date.

Proxy Solicitation Costs

We pay the cost of soliciting proxies. Proxies will be solicited on behalf of the Board by mail, telephone, and other electronic means or in person. Directors and employees will not be paid any additional compensation for soliciting proxies. We may reimburse brokerage firms, banks and other agents for the cost of forwarding proxy materials to beneficial owners.

Our Board has nominated Frank Thomas, Carole S. Ben-Maimon, M.D. and Joseph Truitt for re-election as Class III directors at our Annual Meeting to hold office until our 2029 Annual Meeting of Stockholders.

Our Board is the Company’s ultimate decision-making body, except with respect to those matters reserved to the stockholders. Our Board selects the members of our senior management team, who in turn are responsible for the day-to-day operations of the Company. Our Board acts as an advisor and counselor to senior management and oversees its performance.

Our Board is divided into three classes, with each class holding office for a three-year term. Frank Thomas, Carole S. Ben-Maimon, M.D. and Joseph Truitt, the current Class III directors, have been nominated by our Board for re-election at the Annual Meeting for three-year terms that will expire at our 2029 Annual Meeting of Stockholders and until their successors, if any, are elected or appointed, or their earlier death, resignation, or removal. Each of the nominees has agreed to be named and to serve, and we expect each nominee to be able to serve if elected. If any nominee is unable to serve, the Nominating and Corporate Governance Committee will recommend to our Board a replacement nominee. The Board may then designate the other nominee to stand for election. If you voted for the unavailable nominee, your vote will be cast for his or her replacement.

BOARD STRUCTURE AND COMPOSITION

The Nominating and Corporate Governance Committee is responsible for recommending the composition and structure of our Board and for developing criteria for Board membership. The Nominating and Corporate Governance Committee regularly reviews director competencies, qualities and experiences, with the goal of ensuring that our Board is comprised of an effective team of directors who function collegially and who can apply their experience toward meaningful contributions to our business strategy and oversight of our performance, risk management, organizational development and succession planning.

Our Amended and Restated Bylaws (the “Bylaws”) provide that the number of members of our Board shall be fixed by the Board from time to time. Our Board is currently fixed at six members. Our Board is divided into three classes with staggered three-year terms. The Nominating and Corporate Governance Committee is responsible for identifying individuals that it believes are qualified to become Board members.

CRITERIA FOR BOARD MEMBERSHIP

The Nominating and Corporate Governance Committee considers certain criteria in identifying director nominees. Important general criteria and considerations for Board membership include:

The Nominating and Corporate Governance Committee also considers, on an ongoing basis, the background, experience, skills and overall service to the Company, including level of participation and quality of performance, of the incumbent directors that are important to our current and future business needs, including, among others, the combined mix of experience in the following areas: finance, executive management, the formation and development of start-up companies in the life sciences industry, public company governance and management and biopharmaceutical product development/commercialization.

In recruiting and selecting Board candidates, the Nominating and Corporate Governance Committee considers the size of the Board and the skills of the candidates. The Nominating and Corporate Governance Committee reviews the professional experience and qualifications of each Board member and candidate to determine whether a particular Board member or candidate possesses the necessary skills and/or other attributes to qualify him or her for service on a particular committee. The Nominating and Corporate Governance Committee also considers a wide range of additional factors including other positions the director or candidate holds, including other boards of directors on which he or she serves, and the independence of each director and candidate, to ensure that a substantial majority of the Board is independent. While the Company does not have a formal policy on Board diversity, the Company seeks to maintain a Board comprised of talented and dedicated directors whose skills and backgrounds reflect the diverse nature of the business environment in which the Company operates. The Nominating and Corporate Governance Committee considers the value of diversity on the Board in evaluating director nominees and accordingly, includes in their evaluation consideration of their ability to contribute to the diversity of personal and professional experiences, skills, knowledge, opinions, perspectives and backgrounds on the Board.

Potential Director Candidates

On an ongoing basis, the Nominating and Corporate Governance Committee considers potential director candidates identified on its own initiative, as well as candidates referred or recommended to it by other directors, members of management, search firms, stockholders and others (including individuals seeking to join the Board). Stockholders who wish to recommend candidates may contact the Nominating and Corporate Governance Committee in the manner described in “Stockholder Communications to the Board.” Stockholder nominations must be made according to the procedures required under our Bylaws and described in this Proxy Statement under the heading “Requirements for Submission of Stockholder Proposals for Next Year’s Annual Meeting.” Stockholder-recommended candidates and stockholder nominees whose nominations comply with these procedures and who meet the criteria referred to above will be evaluated by the Nominating and Corporate Governance Committee in the same manner as the Nominating and Corporate Governance Committee’s nominees.

BOARD OVERSIGHT OF COMPANY CULTURE AND Environmental, social and governance HIGHLIGHTS

Our Board is committed to fostering a strong culture of compliance and ethical conduct and has structured its committees and their activities to support its commitment. Our Board supports management’s promotion of a corporate culture of integrity, ethical behavior and compliance with laws and regulations and for ensuring that the Company’s culture and its strategy are aligned. Our Board expects all directors, as well as officers and employees, to conduct themselves in a manner consistent with our Code of Business Conduct and Ethics (the “Code of Conduct”) and our values. Our Board believes that a strong culture of integrity, ethics and compliance is fundamental to the conduct of the Company’s business, and is necessary for effective risk management, maintaining investor trust, and successful corporate governance.

We believe corporate responsibility is essential for good governance because it strengthens the accountability of our Board and management team. We view Environmental, Social and Governance (“ESG”) initiatives as long-term value drivers for the Company and our stockholders. Our focus on, and commitment to ESG initiatives, is tied to our belief that achieving and sustaining business excellence goes hand-in-hand with strong corporate leadership and stewardship. Our Board is primarily responsible for overseeing our corporate strategy, which includes the oversight of ESG matters that impact our business and related risks.

The following is a summary of our current ESG policies and practices:

In each of the director nominee and continuing director biographies that follow, we highlight the specific experience, qualifications, attributes and skills that led the Board to conclude that the director nominee or continuing director should serve on our Board at this time.

DIRECTOR NOMINEES

CLASS III DIRECTORS — PRESENT TERMS EXPIRING AT THE ANNUAL MEETING AND PROPOSED TERMS TO EXPIRE AT THE 2029 ANNUAL MEETING OF STOCKHOLDERS

Frank Thomas has served as a member of the Board since June 2014. Mr. Thomas has been the President and Chief Operating Officer of Orchard Therapeutics plc (“Orchard”), a biotechnology company dedicated to using gene therapy to end the devastation caused by genetic and other severe diseases, since March 2020. Mr. Thomas served as Chief Operating Officer and Chief Financial Officer of Orchard from January 2020 to March 2020 and the Chief Financial Officer and Chief Business Officer of Orchard from January 2018 to December 2019. In January 2024, Orchard was acquired by Kyowa Kirin Co., Ltd., a Japan-based global specialty pharmaceutical company. Prior to joining Orchard, Mr. Thomas served as President and Chief Operating Officer of AMAG Pharmaceuticals, Inc. (“AMAG”), a specialty pharmaceutical company, from April 2015 to April 2017, and previously served as AMAG’s Executive Vice President and Chief Operating Officer from May 2012 through April 2015, and as Executive Vice President, Chief Financial Officer and Treasurer from August 2011 through May 2012. Prior to joining AMAG, he served in various executive roles at public and private biotechnology and medical diagnostics companies, including Molecular Biometrics, Inc., a commercial stage medical diagnostics company, Critical Therapeutics, Inc. (“Critical Therapeutics”), a biopharmaceutical company, and Esperion Therapeutics, Inc., a biopharmaceutical company. His roles at these companies ranged at various times from Chief Executive Officer, Chief Operating Officer and Chief Financial Officer. He also served on the board of directors of Critical Therapeutics. Since July 2017, Mr. Thomas has served on the board of directors of Spero Therapeutics, Inc., a publicly traded biopharmaceutical company, and as chairman of its board of directors since January 2025. Mr. Thomas was a member of the board of directors of the Massachusetts Biotechnology Council from 2007 to 2015. Mr. Thomas holds a B.B.A. from the University of Michigan, Ann Arbor.

Skills & Qualifications: Mr. Thomas’ qualifications to sit on the Board include his extensive executive, financial and operational management experience at biopharmaceutical companies, including board of director roles at various biopharmaceutical companies.

Carole S. Ben-Maimon, M.D. has served as a member of the Board since May 2020. Dr. Ben-Maimon has served as the President and Chief Executive Officer of the Company since May 2020. Dr. Ben-Maimon served as the President, Chief Executive Officer of Chondrial Therapeutics, Inc. (“Chondrial”), with which we completed a business combination with in 2020, and as a member of Chondrial’s board of directors from December 2016 until May 2020. Prior thereto and from 2014 to 2016, she served as an independent consultant at CSGB Consulting, LLC, where she participated in the evaluation of investment opportunities in the brand

and generic industry on behalf of investment firms. Prior thereto, from September 2011 to November 2014, Dr. Ben-Maimon was the President of Global Pharmaceuticals, a subsidiary of Impax Laboratories (“Impax”), which was responsible for Impax’s generic business. Prior to Global Pharmaceuticals, she served as Senior Vice President, Corporate Strategy at Qualitest Pharmaceuticals, Inc. (“Qualitest”) from July 2009 to July 2010. Prior to her role at Qualitest, she served as Founder, President and Chief Executive Officer and director of Alita Pharmaceuticals, Inc., an early stage, privately held specialty pharmaceutical company, from September 2006 to June 2009. Dr. Ben-Maimon also held executive positions with and served as a member of the board with Barr Pharmaceuticals Inc. (“Barr”) from 2001 to 2006, including as President and Chief Operating Officer of Duramed Research, Inc., a wholly-owned subsidiary of Barr, where she led Barr’s branded female healthcare business and also served as a member of its board of directors. Prior to that, from 1993 to 2001, Dr. Ben-Maimon was at Teva Pharmaceutical Industries in various roles, including being responsible for research and development and public policy in North America from 2000 to 2001. From 2016 to 2022, Dr. Ben-Maimon served as a member of the board of directors and the audit and nominating and corporate governance committees of the board of Teligent, Inc. Dr. Ben-Maimon also serves on the board of directors of a privately-held pharmaceutical company and on the board of a not-for-profit hospital in Philadelphia, Pennsylvania. Dr. Ben-Maimon received her B.S. from the University of Pennsylvania and her M.D. from Jefferson Medical College. She completed clinical and research training in internal medicine and nephrology at Thomas Jefferson University.

Joseph Truitt has served as a member of the Board since May 2020. Mr. Truitt has served as the Chief Executive Officer and a director of iECURE, Inc., a gene editing company, since March 2021 and has served on the board of Code Biotherapeutics, Inc., a gene therapy development company since December 2020. From May 2020 through December 2020, Mr. Truitt served as Chief Executive Officer of BioSpecifics Technologies Corp. (“BioSpecifics”), a biopharmaceutical company that develops collagenase-based therapies, which was acquired by Endo International plc in December 2020. From May 2018 until April 2020, Mr. Truitt served as President, Chief Executive Officer and member of the board of directors of Achillion Pharmaceuticals, Inc. (“Achillion”), a publicly-traded clinical-stage biopharmaceutical company developing small molecule drug therapies for immune system disorders, which was acquired by Alexion Pharmaceuticals, a global biopharmaceutical company, in January 2020. Prior to his appointment to the offices or President and Chief Executive Officer in 2018, Mr. Truitt served in a number of various positions at Achillion, including: Executive Vice President, Chief Operations Officer, from September 2017 until May 2018; Executive Vice President, Chief Commercial Officer, from March 2014 until September 2017; and Senior Vice President, Business Development and Chief Commercial Officer, from January 2009 until March 2014. Before joining Achillion, from July 2006 to December 2008, Mr. Truitt served as Vice President, Business Development and Product Strategy of Lev Pharmaceuticals, Inc. and, from 2000 to 2006, he served as Vice President, Sales and Operations of Johnson & Johnson – OraPharma, Inc. Prior to this, be spent nine years at TAP Pharmaceuticals Inc. in a variety of sales and marketing roles before a two-year role as a consultant at IMS Health. Mr. Truitt received his B.S. in Marketing from LaSalle University and his MBA from St. Joseph’s University in Pharmaceutical Marketing. Mr. Truitt previously was a Captain in the United States Marine Corps.

Skills & Qualifications: Mr. Truitt’s qualifications to sit on the Board include extensive management experience, his prior experience as a public company director and his deep knowledge of the biopharmaceutical business.

CONTINUING DIRECTORS

CLASS I DIRECTORS — TERMS EXPIRING AT THE 2027 ANNUAL MEETING OF STOCKHOLDERS

Jonathan Leff has served as a member of the Board since May 2020. Mr. Leff served as a member of the Chondrial Board from December 2016 until May 2020. Mr. Leff is a partner at Deerfield Management Company, L.P. and Chairman of the Deerfield Institute. He joined Deerfield in 2013 and focuses on venture capital and structured investments in biotechnology and pharmaceuticals. Prior thereto, Mr. Leff served as Managing Director at Warburg Pincus LLC from 2000 to 2012, where he led the firm’s investment efforts in biotechnology and pharmaceuticals. Mr. Leff also previously served as a member of the Executive Committee of the Board of the National Venture Capital Association (“NVCA”) and led NVCA’s life sciences industry efforts as Chair of NVCA’s Medical Innovation and Competitiveness Coalition. He also served on the Emerging Companies Section Board of the Biotechnology Industry Organization. Mr. Leff is a board member of several not-for-profit organizations, including the Spinal Muscular Atrophy Foundation and the Columbia University Medical Center Board of Advisors. Mr. Leff served on the board of directors of Biomx Inc., a publicly-traded company, from March 2024 to February 2026. Mr. Leff previously served on the boards of several other publicly-traded biotechnology and pharmaceutical companies, including ARS Pharmaceuticals, Inc. from 2018 to 2023, Proteon Therapeutics, Inc. from 2017 to 2019 and Mirum Pharmaceuticals, Inc. from 2018 to 2019. He currently serves on the boards of several private biopharmaceutical companies and has previously served on the boards of other privately held biopharmaceutical companies. Mr. Leff received his A.B. from Harvard University, MBA from the Stanford University Graduate School of Business and M.S. in Biotechnology from Johns Hopkins University.

Skills & Qualifications: Mr. Leff’s qualifications to sit on the Board include his extensive leadership, executive, managerial and business experience with life sciences companies, including experience in the investment, development and sale of multiple companies in the life sciences sector.

Jeffrey W. Sherman, M.D., FACP has served as a member of the Board since October 2023. Dr. Sherman served as a consultant at Amgen Inc., a biopharmaceutical company ("Amgen"), from October 2023 through December 2025. From 2009 to October 2023, Dr. Sherman held several positions of increasing responsibility at Horizon Therapeutics Public Limited Company (“Horizon Therapeutics”), a biotechnology company acquired by Amgen in October 2023, most recently serving as the Executive Vice President, Chief Medical Officer. Before joining Horizon Therapeutics, he held positions at pharmaceutical companies such as IDM Pharma, Inc., Takeda Global Research and Development, NeoPharm Inc., G.D. Searle, LLC/Pharmacia Corporation and Bristol-Myers Squibb. Dr. Sherman is a member of a number of professional societies, a board member of the Center for Healthcare Innovation, a former member of the board of advisors of the Center for Information and Study on Clinical Research Participation, a former steering committee member of the U.S. Food & Drug Administration sponsored Clinical Trial Transformation Initiative, a former board chairperson and now inaugural fellow of the Drug Information Association, a former member of the Global Genes Medical and Scientific Advisory Board, and involved with the National Organization for Rare Disorders and the European Organization for Rare Diseases. He has served as an Adjunct Assistant Professor of Medicine at the Northwestern University Feinberg School of Medicine and is a member of the executive committee of the alumni board, an advisory board member of the Stanford University School of Medicine Master of Science in Translational Research and Applied Medicine program, and a diplomat of the National Board of Medical Examiners and the American Board of Internal Medicine. Dr. Sherman currently serves on the board of directors of Xeris Biopharma Holdings, Inc. (“Xeris Biopharma”), a publicly traded biopharmaceutical company, and previously served on the boards of directors of Strongbridge Biopharma plc (“Strongbridge”) from October 2016 until October 2021 and Xeris Pharmaceuticals, Inc. (“Xeris”) from April 2018 until October 2021. Xeris acquired Strongbridge in October 2021 and in connection therewith both Xeris and Strongbridge became wholly owned subsidiaries of Xeris Biopharma. Additionally, Dr. Sherman serves on the board of directors of Sorriso Pharmaceuticals, Inc. Dr. Sherman holds a B.A. in Biology from Lake Forest College and a M.D. from the Chicago Medical School at Rosalind Franklin University of Medicine and Science. He completed an internal medicine internship, residency and chief medical residency at the McGaw Medical Center at Northwestern University Feinberg School of Medicine, an infectious diseases fellowship at the University of California, San Francisco (“UCSF”), and was a research associate at the Howard Hughes Medical Institute at UCSF.

Skills & Qualifications: Dr. Sherman’s qualifications to sit on the Board include his extensive pharmaceutical experience, including experience in regulatory and clinical strategy and therapeutic development for rare diseases.

CLASS II DIRECTOR —  TERM EXPIRING AT THE 2028 ANNUAL MEETING OF STOCKHOLDERS

Thomas E. Hamilton has served as a member of the Board since May 2020. Mr. Hamilton served as the Chairman of the board of directors of Chondrial from Chondrial’s founding in 2013 until May 2020. Since 2013, Mr. Hamilton has served as the managing member of Friedreich’s Ataxia Life Sciences, an early stage biotech investment company focused on bridging the gap to cure Friedreich’s ataxia. From 2013 to 2019, Mr. Hamilton served as the president, chief executive officer and owner of Construction Forms, Inc. (“Construction Forms”), an industrial manufacturing company based in Port Washington, Wisconsin. Prior to founding Construction Forms, Mr. Hamilton spent 25 years in several leadership positions in the financial industry. Most recently, Mr. Hamilton served as a Managing Director and Strategic Advisor to the Head of Fixed Income, Currencies and Commodities at Barclays Capital in New York, New York. Prior to Barclays, Mr. Hamilton held various managing director roles at Citigroup, Inc. and Salomon Brothers, Inc., where he began his career. He also serves as a director and executive committee member of the Friedreich’s Ataxia Research Alliance and is the co-founder of his own charitable scientific effort, the CureFA Foundation. Since March 2019, Mr. Hamilton has served as a Director and as a member of the audit committee, risk committee and compensation committee of the board of Annaly Capital Management, Inc., a leading diversified capital manager that invests in and finances residential and commercial assets. Mr. Hamilton holds a B.S. in finance from the University of Dayton.

Skills & Qualifications: Mr. Hamilton’s qualifications to sit on the Board include his extensive experience in the financial industry and leadership in developing a cure for Friedreich’s ataxia, including leadership roles in organizations focused on the development of a cure for Friedreich’s ataxia.

We are committed to good corporate governance and integrity in our business dealings. We believe that strong corporate governance practices that provide meaningful rights to our stockholders and ensure Board and management accountability are key to our relationship with our stockholders. We strive to have regular, constructive conversations with our stockholders to better understand our stockholders’ priorities and perspectives.

Our governance practices are documented in our Ninth Amended and Restated Certificate of Incorporation, as amended, our Bylaws, our Code of Conduct, our Corporate Governance Guidelines and the charters of the committees of the Board (the “Committees”). Aspects of our governance documents are summarized below. You can find our charters for each Committee and our Code of Business Conduct and Ethics on our website at www.larimartx.com under “Investors — Corporate Governance.”

BOARD INDEPENDENCE

Our Board has determined that each of our current directors, with the exception of Dr. Ben-Maimon, are “independent” directors, as defined under the rules of Nasdaq. In making such determination, the Board considered the relationships that each such non-employee director has with the Company and all other facts and circumstances that the Board deemed relevant in determining their independence, including the beneficial ownership of our common stock by each non-employee director. In considering the independence of the directors listed above, the Board also considered the association of each non-employee director with the holders of more than 5% of our common stock. Our independent directors generally meet in executive session at each regularly scheduled Board meeting.

BOARD LEADERSHIP STRUCTURE

Currently, our leadership structure separates the offices of CEO and Chairperson of the Board with Dr. Ben-Maimon serving as our CEO and Mr. Truitt serving as Chairperson of the Board. Separating these positions allows the CEO to focus on day-to-day business, while allowing the Chairperson of the Board to lead the Board in its fundamental role of providing advice to, and independent oversight of, management. The Board recognizes the time, effort and energy that the CEO must devote to her position in the current business environment, as well as the commitment required to serve as Chairperson of the Board, particularly as the Board’s oversight responsibilities continue to grow. The Board believes it is important to retain its flexibility to allocate the responsibilities of the officers of Chairperson of the Board and CEO in any way that is in the best interest of the Company at a given point in time. Our Board believes that the separation of the positions of CEO and Chairperson of the Board reinforces the independence of the Board from management, creates an environment that encourages objective oversight of management’s performance and enhances the effectiveness of our Board as a whole. Although our Bylaws do not require the Chairperson of the Board and CEO positions to be separate, the Board believes that having separate positions is the appropriate leadership structure for the Company currently. The Nominating and Corporate Governance Committee periodically evaluates our Board leadership structure and whether its leadership structure is appropriate to effectively address the specific needs of our business and the long-term interests of our stockholders.

BOARD COMMITTEES

Our Board has established various Committees to assist in discharging its duties: the Audit Committee, the Compensation Committee and the Nominating and Corporate Governance Committee. Each member of our Committees is an “independent director” as that term is defined by the SEC and Nasdaq. The primary responsibilities of each of the Committees and the Committee memberships are provided below under the section entitled “Board Attendance, Committee Meetings and Committee Membership.”

Each of the Committees has the authority, as its members deem appropriate, to engage legal counsel or other experts or consultants in order to assist the Committee in carrying out its responsibilities.

RISK MANAGEMENT

While the Board has the ultimate oversight responsibility for the risk management process, including monitoring and assessing strategic risk exposure, its Committees oversee risk in certain specified areas. Pursuant to its charter, the Audit Committee oversees management of financial reporting, compliance and litigation risks, including risks related to our insurance, information technology, cybersecurity, human resources and regulatory matters, as well as the steps management has taken to monitor and control such exposures. The Compensation Committee is responsible for overseeing the management of risks relating to our executive compensation policies, plans and arrangements and the extent to which those policies or practices increase or decrease risk for the Company, while the Nominating and Corporate Governance Committee manages risks associated with the independence of the Board, potential conflicts of interest and the effectiveness of the Board.

EVALUATING BOARD EFFECTIVENESS

The Board, led by the Nominating and Corporate Governance Committee, is committed to continuous improvement and believes annual self-evaluations are an important tool for evaluating effectiveness. It conducts an annual self-evaluation of the Board, which is presented to the Board for discussion. In addition, each Committee conducts an annual self-assessment in a review process similar to that used by the Board.

CODE OF BUSINESS CONDUCT AND ETHICS

We have a written Code of Business Conduct and Ethics (the "Code of Conduct") that applies to our directors, officers and employees, including our principal executive officer ("PEO"), principal financial officer, principal accounting officer or controller, or persons performing similar functions. The Code of Conduct covers fundamental ethical and compliance-related principles and practices such as accurate accounting records and financial reporting, avoiding conflicts of interest, the protection and use of our property and information and compliance with legal and regulatory requirements. The Code of Conduct and any amendments thereto, or any waivers of its requirements, are disclosed on our website at www.larimartx.com under “Investors – Corporate Governance.”

INSIDER TRADING POLICY

We have adopted insider trading policies and procedures governing the purchase, sale, and other dispositions of our securities by directors, officers, and employees that we believe are reasonably designed to promote compliance with insider trading laws, rules and regulations, and applicable Nasdaq listing standards. Our insider trading policy states, among other things, that our directors, officers, and employees are prohibited from trading in such securities while in possession of material, nonpublic information. The foregoing summary of our insider trading policies and procedures does not purport to be complete and is qualified by reference to our Insider Trading Policy filed as an exhibit to our 2025 Annual Report. In addition, with regard to the Company's trading in its own securities, it is our policy to comply with the federal securities laws and the applicable exchange listing requirements.

DIRECTOR ORIENTATION AND CONTINUING EDUCATION

Our director orientation and continuing education programs familiarize new directors with the Company’s businesses, strategies, and policies, and assists new directors in developing the skills and knowledge required for their service on the Board. From time to time, management advises, or invites outside experts to attend Board meetings to advise, the Board on its responsibilities, management’s responsibilities, developments relevant to corporate governance and best corporate practices. Additionally, Board members may attend, and are encouraged to attend, director education programs.

CORPORATE GOVERNANCE GUIDELINES

We have a written set of Corporate Governance Guidelines that are designed to help ensure effective corporate governance of our Company. Our Corporate Governance Guidelines cover topics including, but not limited to, the size and composition of the Board, Board membership criteria, director qualifications and duties, Board committees, director compensation and director communications with third parties. Succession planning for the Board is critical to our success. Our goal is to achieve a Board that provides effective oversight of the Company. Our Corporate Governance Guidelines are reviewed periodically by the Nominating and Corporate Governance Committee, which recommends any proposed changes to our Board for approval.

BOARD ATTENDANCE, COMMITTEE MEETINGS AND COMMITTEE MEMBERSHIP

During 2025, our Board held thirteen meetings, our Audit Committee held five meetings, our Compensation Committee held four meetings and our Nominating and Corporate Governance Committee held three meetings. Each director attended at least 75% of the meetings of the Board and meetings of each Committee on which he or she served during 2025.

Directors are encouraged, but not required, to attend our annual stockholder meetings. All of our directors attended the 2025 Annual Meeting of Stockholders.

Audit Committee

The Audit Committee assists the Board by providing oversight of our financial management, independent auditor, and financial reporting procedures, as well as such other matters as directed by the Board or the Audit Committee Charter.

Among other things, the Audit Committee’s responsibilities include:

The members of our Audit Committee are Mr. Thomas (chair), Mr. Hamilton and Mr. Truitt. All members of our Audit Committee are deemed “independent” and financially literate under the applicable rules and regulations of the SEC and Nasdaq. Our Board has determined that each of Messrs. Thomas and Truitt qualify as an “audit committee financial expert” within the meaning of SEC regulations. This designation does not impose any duties, obligations or liabilities that are greater than are generally imposed on members of our Audit Committee and our Board.

Nominating and Corporate Governance Committee

The Nominating and Corporate Governance Committee identifies qualified individuals for membership on the Board, recommends to the Board the director nominees to fill vacancies on the Board and to stand for election at the next annual meeting of stockholders, develops and recommends to the Board a set of corporate governance guidelines for the Board and provides oversight of the corporate governance affairs of the Board, as well as such other matters as directed by the Board or the Nominating and Corporate Governance Charter. Among other things, our Nominating and Corporate Governance Committee’s responsibilities include:

The Nominating and Corporate Governance Committee is responsible for identifying individuals that the Nominating and Corporate Governance Committee believes are qualified to become Board members, as described above in the sections entitled “Board Structure and Composition” and “Criteria for Board Membership.”

The members of our Nominating and Corporate Governance Committee are Mr. Leff (chair), Mr. Hamilton and Dr. Sherman. The Board has determined that all Nominating and Corporate Governance Committee members are independent under the listing standards of Nasdaq.

Compensation Committee

The Compensation Committee reviews the performance and development of our management in achieving corporate goals and objectives and assures that our executive officers (including our CEO) are compensated effectively in a manner consistent with our strategy, competitive practices and stockholder interests, as well as such other matters as directed by the Board or the Compensation Committee Charter. Among other things, the Compensation Committee’s responsibilities include:

Subject to certain limitations, our Compensation Committee has delegated authority to our CEO to grant options or other stock awards to our non-executive officers. Our Compensation Committee also has the authority to form and delegate authority to one or more subcommittees as it deems appropriate from time to time under the circumstances. The Compensation Committee annually reviews the performance of each of the executive officers, including the CEO. It then determines and approves the compensation of each executive officer, other than the CEO, and determines and makes recommendations regarding the CEO’s compensation level to the Board for approval.

Aon’s Human Capital Solutions practice, a division of Aon plc ("Aon"), a widely recognized leader in gathering and analyzing industry compensation trends, serves as our independent compensation consultant for executive compensation. Aon reports directly to the Compensation Committee and provides various executive compensation services to the Compensation Committee, including advising the Compensation Committee on the principal aspects of our executive compensation program and evolving industry practices and providing market information and analysis regarding the competitiveness of our compensation program design and our award values in relation to performance. In addition, Aon serves as our insurance broker for all of our commercial lines of insurance.

The members of our Compensation Committee are Mr. Truitt (Chair), Mr. Leff and Mr. Thomas. The Board has determined that all Compensation Committee members are independent under the listing standards of Nasdaq, and that they are “non-employee directors” for purposes of Rule 16b-3 under the Securities Exchange Act of 1934 (the “Exchange Act”).

FAMILY RELATIONSHIPS

There are no family relationships among any of our directors or executive officers.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

During the fiscal year ended December 31, 2025 and as of the date of this Proxy Statement, none of the members of the Compensation Committee was or is one of our officers or employees, and none of our executive officers has served or serves on the compensation committee or board of any company that employed or employs any member of our Compensation Committee or Board.

STOCKHOLDER ENGAGEMENT

Connect

Engaging with investors is fundamental to our commitment to good corporate governance and essential to maintaining strong corporate governance practices. Throughout the year, we seek opportunities to connect with our investors to gain and share valuable insights into current and emerging global governance trends.

Collaborate

We strive for a collaborative approach to stockholder engagement and value the variety of investors’ perspectives received, which helps deepen our understanding of their interests and motivations.

Communicate

Our goal is to communicate with our stockholders through various platforms, including via our website at www.larimartx.com, in print and in person at investor presentations or stockholder meetings. We view communication between our stockholders and our Board as a dialogue.

We have designed and implemented our compensation program for our non-employee directors to attract, motivate and retain individuals who are committed to our values and goals and who have the expertise and experience that we need to achieve those goals.

NON-EMPLOYEE DIRECTOR COMPENSATION POLICY

Our 2025 non-employee director compensation policy is set forth in the table below.

The Board approved, based on Aon’s assessment of publicly available director compensation data, an amendment to our director compensation policy, which became effective on January 1, 2026. The table below depicts the compensation elements of our amended director compensation policy:

DIRECTOR COMPENSATION TABLE

The following table below sets forth summary information regarding the compensation of our non-employee directors for the fiscal year ended December 31, 2025.

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FEES

The Audit Committee works with our management in order to negotiate appropriate fees with PwC for the Company and is ultimately responsible for approving those fees. The following is a summary and description of fees for services provided by PwC in 2025 and 2024:

“Audit fees” represents the aggregate fees for professional services rendered for the audit of our consolidated financial statements on Form 10-K, consents for the use of audit reports and reference to the auditor as an expert in our registration statements and professional services rendered for the review of our quarterly financial statements on Form 10-Q that are customary under the standards of the Public Company Accounting Oversight Board (United States). Also included are the fees related to our Registration Statements on Form S-3 and Form S-8.

“All other fees” represents payment for access to PwC’s technical accounting and reporting software tools. These fees were approved by the Audit Committee.

AUDIT COMMITTEE PRE-APPROVAL POLICIES AND PROCEDURES

The Audit Committee is responsible for appointing, retaining, setting compensation for, and evaluating and overseeing the work of the independent registered public accounting firm. The Audit Committee’s charter establishes a policy that all audit and permissible non-audit services provided by the independent registered public accounting firm will be pre-approved by the Audit Committee.

All such audit and permissible non-audit services were pre-approved in accordance with this policy during the fiscal year ended December 31, 2025. These services may include audit services, audit-related services, tax services and other services. The Audit Committee considers whether the provision of each non-audit service is compatible with maintaining the independence of our independent registered public accounting firm. The responsibility to pre-approve audit and non-audit services may be delegated by the Audit Committee to one or more members of the Audit Committee; provided that any decisions made by such member or members must be presented to the full Audit Committee at its next scheduled meeting.

The primary purpose of the Audit Committee is to assist the Board in its general oversight of the Company’s financial reporting process.

Management is primarily responsible for the preparation, presentation, and integrity of the Company’s consolidated financial statements, accounting and financial reporting principles, internal controls and procedures designed to ensure compliance with accounting standards, applicable laws, and regulations. The Company’s independent registered public accounting firm for the fiscal year 2025, PwC, is responsible for performing an independent audit of the consolidated financial statements and expressing an opinion on the conformity of those consolidated financial statements with generally accepted accounting principles.

The Audit Committee has reviewed and discussed the audited consolidated financial statements contained in the Company’s 2025 Annual Report with management and PwC. The Audit Committee has discussed with PwC the matters required to be discussed by the applicable requirements of the Public Company Accounting Oversight Board (“PCAOB”) and the SEC. In addition, PwC has provided the Audit Committee with the written disclosures and the letter required by the applicable requirements of the PCAOB regarding PwC’s communications with the Audit Committee concerning independence, and the Audit Committee has discussed with PwC its independence.

The Audit Committee also considered whether the independent registered public accounting firm’s provision of non-audit services to the Company is compatible with the auditor’s independence. The Audit Committee has concluded that the independent registered public accounting firm is independent from the Company and its management. Based on the considerations and discussions referred to above, the Audit Committee recommended to the Board that the audited consolidated financial statements be included in the Company’s 2025 Annual Report.

Audit Committee

Frank Thomas (Chair)

Thomas E. Hamilton

Joseph Truitt

The following table sets forth the name, age and position of each of our executive officers as of the date of this Proxy Statement:

Carole S. Ben-Maimon, M.D. — For biographical information for Carole S. Ben-Maimon, M.D., see “Board of Directors — Director Nominees.”

Michael Celano has served as our Chief Financial Officer since May 2020 and as our Secretary since April 2021. Prior to joining the Company, Mr. Celano served as the Chief Financial Officer of The Columbus Organization, a provider of services for individuals with intellectual and developmental disabilities, since January 2020. From May 2019 to January 2020, Mr. Celano performed consulting work. From January 2018 to May 2019, Mr. Celano served as the Chief Operating Officer of formerly Recro Pharma, Inc., and from July 2016 to January 2018, Mr. Celano served as their Chief Financial Officer. Between 2015 and June 2016 Mr. Celano was self-employed providing consulting services to healthcare companies. From 2013 to 2015, Mr. Celano served as Chief Financial Officer of DrugScan, Inc., a clinical laboratory services company. Prior to that, Mr. Celano served as the Chief Financial Officer of Kensey Nash Corporation, a biomaterials company, from 2009 to 2012. From 2004 to 2008, Mr. Celano also served as Chief Financial Officer for BioRexis Pharmaceutical Corporation (“BioRexis”), a biopharmaceutical company. Before joining BioRexis, Mr. Celano served as a partner with KPMG LLP (“KPMG”) where he was co-leader of its National Life Science Practice. Mr. Celano also was co-leader of the Life Science Practice for Arthur Andersen LLP before he joined KPMG. Mr. Celano previously served on the boards of directors of OraSure Technologies, Inc. (“OraSure”), a publicly-traded company specializing in point-of-care diagnostic tests and specimen collection devices, from October 2006 to November 2022, and as the chairman of the board of OraSure from April 2018 to November 2022, and Performance Health, a consumer health care product manufacturing company, from 2015 to 2016. Mr. Celano holds a B.S. in Accounting from St. Joseph’s University.

Gopi Shankar, Ph.D., MBA, FAAPS has served as our Chief Development Officer since February 2023. Before joining the Company, Dr. Shankar served as Vice President and Global Head, Biologics Development Sciences at Janssen Research & Development, Inc. (“Janssen R&D”), a pharmaceutical company of Johnson & Johnson, Inc. (“Johnson & Johnson”) from April 2018 to April 2022, where he led a global, 175-person R&D department that contributed to more than 60 combined investigational new drug applications, biologics license applications, and marketing authorization application filings, after which he undertook a sabbatical from April 2022 to February 2023. Dr. Shankar had also worked as Senior Director and Head, Bioanalytical Sciences and Immunogenicity at Janssen R&D from May 2011 to April 2018. Prior to joining Janssen R&D, Dr. Shankar served as Director, Immune Response Assessment and Research at Centocor Research & Development, Inc., a wholly-owned subsidiary of Johnson & Johnson, from June 2007 to April 2011 where he contributed to multiple regulatory approvals and spearheaded the publication of five multi-author white papers that formed the basis of the FDA and European Medicines Agency guidance on clinical immunogenicity assessment and reporting. Dr. Shankar is a Fellow of the American Association of Pharmaceutical Scientists (“AAPS”) and previously served as the AAPS’ President. Dr. Shankar holds a B.S. in Biology from Saint Mary’s University, an M.S. in Molecular and Cell Biology from Oklahoma State University, a Ph.D. in Immunology from the University of Kentucky and a MBA in Leadership & General Management from Drexel University’s LeBow College of Business.

Russell G. Clayton, DO has served as our Chief Medical Officer since July 2023. Prior to joining the Company, Dr. Clayton served as Principal at Aeremedea, a company providing consulting services, including translational and clinical research, regulatory affairs, medical affairs, and management/operations to companies developing pharmaceuticals, biologics, or medical devices either directly or through clinical research organizations, from April 2017 to July 2023, where he worked with the Company and several other companies as an advisor, contractor, and interim Chief Medical Officer to support the development and commercialization of therapies targeting rare diseases across several therapeutic areas. Dr. Clayton has also served as a member and Chair of the Company’s Scientific Advisory Board since June 2021. From June 2015 to April 2017, Dr. Clayton served as the Chief Medical Officer at Alcresta Therapeutics, Inc. (“Alcresta”), a medical device company. While at Alcresta, Dr. Clayton led clinical development and medical affairs, overseeing the design and execution of pivotal clinical studies as well as developing a medical affairs capability in support of a new product launch. Dr. Clayton previously served in a number of roles at Discovery Laboratories, Inc. (“Discovery”), a pharmaceutical and medical device company, including Senior Vice President, Research and Development from October 2011 to November 2014, Vice President, Research and Development from June 2009 to October 2011, Vice President, Medical and Academic Affairs from September 2007 to June 2009, Vice President, Global Research and Development from May 2006 to September 2007

and Vice President of Medical Affairs from December 2005 to April 2006. At Discovery, Dr. Clayton led the scientific and regulatory efforts leading to the marketing authorization of Discovery’s first product. Prior to joining Discovery, Dr. Clayton served as the Director of International Regulatory Affairs and Regional Medical Director, Medical and Scientific Affairs at Merck & Company. Dr. Clayton is a board-certified pediatric pulmonologist and previously served as Attending Pulmonologist at both the Children’s Hospital of Philadelphia, where he was Director of the Asthma Program for the Division of Pulmonary Medicine and Associate Director for the Cystic Fibrosis Center, and St. Christopher’s Hospital for Children in Philadelphia. Dr. Clayton also served as Assistant Professor of Pediatrics at Temple University School of Medicine and the University of Pennsylvania School of Medicine. Dr. Clayton has dedicated his career to improving neonatal and pediatric respiratory and critical care medicine, is published in scientific literature and has presented at universities, hospitals, and medical conferences and otherwise routinely engaged in scientific exchange on the topic of neonatal pulmonary medicine. Dr. Clayton holds a B.A. in Biology from La Salle University and a DO from the Philadelphia College of Osteopathic Medicine.

This section discusses the material components of the executive compensation program for our named executive officers ("NEOs"). In 2025, our NEOs were:

Key Aspects of Our 2025 Executive Compensation Program

Substantial Majority of CEO Compensation is Variable and At-Risk

Approximately 81% of our CEO’s 2025 target total direct compensation (consisting of base salary, target annual cash incentive and target fair value of long-term equity incentives, which consisted of stock options, restricted stock units ("RSUs") and performance-based restricted stock units (“PSUs”)) was considered variable and at-risk and approximately 67% of our other NEOs’ 2025 target total direct compensation, on average, was considered variable and at-risk. We consider compensation to be “at-risk” if it is subject to achievement of meaningful pre-set, objective milestone, financial or operating goals, such as in our annual cash incentive program and for our PSUs, or if it depends on stock price appreciation or value, such as in our other long-term equity incentive awards. These high proportions of variable and at-risk compensation enhance the strong link between pay and performance for our CEO and other NEOs and the alignment of their interests with those of the Company and our stockholders.

Additionally, the performance-based metrics that were a part of our annual cash incentive program, together with the performance conditions applicable to our equity-based PSU awards, further enhanced the link between pay and performance for the CEO and our other NEOs. These programs only reward executives for performance based on our achievement of key goals, which strengthens the alignment of the interests of our CEO and other NEOs with those of our stockholders.

Performance-Based Equity

In January 2025, our Compensation Committee, or Board, as applicable, granted PSUs to our NEOs. Our NEOs will earn a percentage of the PSU awards based upon our achievement of certain regulatory milestones, and, in each case, 50% of such earned portion will vest upon the Compensation Committee’s determination of the achievement of such regulatory milestones (the “Achievement Determination Date”) and the remaining 50% will vest upon the one-year anniversary of the Achievement Determination Date.

2025 NEO Equity Compensation: High Proportion Variable and At-Risk

Consistent with the market practice of similar biopharmaceutical companies, and in order to focus executives on growth and increasing stockholder value at this stage of our development, in 2025, each of our NEOs received stock options, PSUs and RSUs. The annual stock option and RSU grants to our NEOs considered the strong success of our continued clinical development and subsequent financings, our NEOs' leadership and their efforts to strengthen the Company with a small team as a small-size public company. The target mix of the annual equity grants was approximately 75% stock options and 25% RSUs. Additionally, in January 2025, our Compensation Committee, or Board, as applicable, granted PSUs to our NEOs. These PSUs, which are separate from our annual equity grants, have the opportunity to vest in connection with specific performance milestones.

Stock options are inherently performance-based, requiring stock price appreciation before there is any value earned, and are a direct and straightforward means of incentivizing our executives. In addition, stock options reward our NEOs for increasing stockholder value over the lengthier term of the option, relative to other forms of equity compensation, which we believe aligns well with the biopharmaceutical development cycle which extends for a number of years. If our stock price does not increase, there is no amount of time that will make a stock option award deliver any value. The RSUs are complementary to the stock options because they have upside potential but deliver some value even during periods of market or stock price underperformance, providing a retention incentive and reinforcing an ownership culture and commitment to the Company. Additionally, the PSUs are complementary to the stock options because the underlying vesting of the PSUs is contingent upon the achievement of certain performance milestones that are focused on the Company's performance goals, providing a balanced incentive structure that aligns our NEOs' performance goals with the Company's performance goals.

Short-Term Annual Cash Incentive: Rigorous, Pre-Set Research, Clinical and Regulatory Milestones, With Annual Incentive Plan Payouts Reflecting Pay for Performance Alignment

At the start of 2025, the Compensation Committee established research, clinical and regulatory milestones and financial goals under our annual performance-based cash incentives. These goals were rigorous, aggressive and challenging, attainable only with strong performance, and took into account the relevant opportunities and risks of our product candidate programs.

In early 2026, the Compensation Committee assessed our performance against our 2025 goals under the annual bonus program. These determinations resulted in the Compensation Committee recommending, and the Board approving, an 86% level of achievement for the Company against our 2025 goals. This performance, which falls below the target level, shows the rigor of our goals and of the Compensation Committee’s challenging performance assessment, and demonstrates the strong pay for performance alignment of our program. The alignment of the executive compensation program is underscored in view of the fact that when achievement of corporate goals is below target levels, as it was in 2025, at 86% of target, payouts are less, and when achievement of corporate goals is above target level, payouts are more.

Peer Group: Appropriate Peer Group to Reference

Consistent with best practices for corporate governance, the Compensation Committee annually reassesses the group of peer companies used as a reference point for evaluating executive compensation. In connection with determining the compensation of our CEO and other executive officers, in September 2024, the Compensation Committee conducted a review of our peer group to ensure its continued appropriateness, and updated the peer group utilized by the Compensation Committee with respect to compensation decisions for 2025. In light of the change in our organizational size and market capitalization, the Compensation Committee revised the peer group selection criteria. The peer group selection criteria were updated to reference a market capitalization range of 1/3x to 3x the Company’s market capitalization and headcount between 20 and 165 employees based on the publicly available data at the time of selection, which resulted in the removal of eight companies and the addition of eight new companies as compared to our 2024 peer group, and resulting in an 19-member compensation peer group.

2025 Support for the Company's Executive Compensation Program

We held our advisory vote on executive compensation at our 2025 Annual Meeting of Stockholders. Although this advisory vote on compensation, known as the "say-on-pay" vote, is advisory and not binding on us, the Compensation Committee and the Board value the opinions of stockholders and review the voting results in connection with their ongoing evaluation of our compensation philosophy and compensation decisions.

At our 2025 Annual Meeting of Stockholders, we received the support of approximately 97.1% of the votes cast on our say-on-pay proposal. The Compensation Committee viewed the results of the vote on our say-on-pay proposal as evidence that a substantial majority of stockholders are aligned with our executive compensation program. The Board and the Compensation Committee will continue to carefully consider the results of any vote on a say-on-pay proposal in the future.

2025 SUMMARY COMPENSATION TABLE

The following table sets forth information concerning the compensation of our NEOs during the fiscal years ended December 31, 2025 and December 31, 2024:

NARRATIVE DISCLOSURE TO 2025 SUMMARY COMPENSATION TABLE

The following describes the material factors necessary to understand the compensation disclosed in the Summary Compensation Table above. NEO compensation generally consists of base salary, annual cash bonus opportunities, long term incentive compensation in the form of equity awards and other benefits, as described below.

Base Salary

The base salary payable to each NEO is intended to provide a fixed component of compensation reflecting the executive’s skill set, experience, role, responsibilities, and contributions.

For 2025, our Compensation Committee or Board, as applicable, approved increases to base salaries for Dr. Ben-Maimon, Mr. Celano and Dr. Shankar based on factors evaluated by the Compensation Committee, including performance and reference to the third-party market compensation data provided by our compensation consultant, as necessary to be competitive with our peer group. For 2025, the annual base salary rates for Dr. Ben-Maimon, Mr. Celano and Dr. Shankar, and the changes from their 2024 salaries, were as follows:

Annual Performance-Based Cash Bonus Opportunities

Each of our NEOs’ performance-based cash bonus opportunity is expressed as a percentage of base salary that can be achieved by meeting predetermined corporate and individual performance objectives. Our Compensation Committee annually approves each of the Chief Financial Officer and Chief Medical Officer’s bonus payout for the year, while the Board annually approves, upon recommendation from the Compensation Committee, the CEO’s bonus payout for the year. The performance-based metrics that are a part of our annual cash incentive program enhance the link between pay and performance for the CEO and our other NEOs. In particular, the compensation opportunity under our annual cash program is at risk.

The 2025 annual bonuses for Dr. Ben-Maimon, Mr. Celano and Dr. Shankar were targeted at 55%, 40% and 40% of their respective base salaries. For 2025, they were eligible to earn their annual bonuses pursuant to the achievement of corporate performance goals as previously approved by the Board. These corporate goals primarily included certain advancements in our clinical program, achievement of certain regulatory milestones, raising sufficient capital and certain manufacturing and CMC advances. We met our goal of reaffirming the FDA’s willingness to consider use of FXN as novel surrogate endpoint and confirmed our exposure-response analysis exploring the relationship between nomlabofusp exposures and clinical outcome measures is the type that could support our future Biologics License Application (BLA) submission. In addition in 2025, we met our target goals of completing enrollment of greater than 20 adults in our open label study and enrollment of our first adolescent patient. In addition, we met our goal of obtaining FDA input on the safety data needed for our BLA submission, and achieved certain of our goals as they related to raising capital to achieve business objectives. In January 2026, after considering these achievements, the Compensation Committee recommended, and the Board approved, the 2025 corporate goals at an overall achievement level of 86%. Following a review of the achievement level, our Compensation Committee approved, and, in the case of Dr. Ben-Maimon, our Compensation Committee recommended and our Board approved, 2025 annual cash bonus payments to each of Dr. Ben-Maimon, Mr. Celano and Dr. Shankar in an amount equal to 86% of their respective target bonus amounts, totaling $307,450, $173,720 and $160,305, respectively.

Equity-based Compensation Incentives

The Compensation Committee and the Board designed the long-term incentive equity opportunity to motivate and reward the Company’s executive officers to achieve multi-year strategic goals and to deliver sustained long-term value to stockholders. Our equity-based incentive awards are also designed to align our interests and the interests of our stockholders with those of our NEOs. Our Board or Compensation Committee, as applicable, approves equity grants.

Consistent with what we believe to be the prevailing market practice for companies in our industry at our stage of development, we have historically used stock options and RSUs to compensate our NEOs in the form of initial new hire grants in connection with the commencement of employment, and thereafter on an annual basis in connection with our annual executive compensation reviews. The Compensation Committee and the Board structured the mix of equity vehicles and the relative weight assigned to each type of award for the following reasons: 1) to motivate stock price appreciation over the long term through stock options, which deliver value only if the stock price increases, and 2) to ensure some amount of value delivery through the RSUs, which were complementary because they have upside potential but deliver some value even during periods of stock price underperformance, while also reinforcing an ownership culture and commitment to the Company.

In January 2025, our Compensation Committee, or Board, as applicable, granted PSUs to our NEOs as discussed further below. Also, in January 2025, following a review of the achievement level of our 2024 corporate goals and objectives, our Compensation Committee approved, and, in the case of Dr. Ben-Maimon, our Compensation Committee recommended and our Board approved, equity awards to each of Dr. Ben-Maimon, Mr. Celano and Dr. Shankar.

The Compensation Committee’s executive equity award strategy for 2025 focused on providing a market competitive number of stock options, PSUs and RSUs, with the majority of equity awards provided in stock options to ensure that our executives are aligned with stockholder value creation and to ensure that the program reflects pay for performance. The target mix for the value of the annual equity grants was approximately 75% stock options and 25% RSUs. The PSUs granted to our NEOs will vest in connection with specific performance milestones.

In January 2025, our Compensation Committee approved, and, in the case of Dr. Ben-Maimon, our Compensation Committee recommended and our Board approved, the following equity grants for each of our NEOs:

In the Compensation Committee’s view, stock options are inherently performance-based, requiring stock price appreciation before there is any value earned, and are a direct and straightforward means of incentivizing our NEOs. In addition, stock options reward our NEOs for increasing stockholder value over the lengthier term of the option, relative to other forms of equity compensation, which we believe aligns well with the biopharmaceutical development cycle which extends for a number of years. Each of the option awards will vest 25% on the first anniversary of the grant date, with the remaining 75% vesting in equal monthly installments on the last day of each of the 36 calendar months immediately following such date, subject to the grantee’s continued service through the applicable vesting dates.

The RSUs vest in four equal annual installments beginning on the first anniversary of the grant date, subject to the grantee’s continued service through the applicable vesting dates.

The PSUs vest pursuant to the successful achievement of two regulatory milestones (each a "Performance Milestone"): (i) the FDA accepts by December 31, 2026, the filing of a Biologics License Application ("BLA") for accelerated approval of nomlabofusp and (ii) the FDA approves our nomlabofusp (CTI-1601) therapy within 12 months of BLA acceptance. Upon the achievement of the first Performance Milestone, 20% of the PSU award will become subject to the vesting terms described below. Upon achievement of the second Performance Milestone, the remaining 80% of the PSU award will become subject to the vesting terms described below. With respect to each Performance Milestone set forth above, upon the Compensation Committee’s determination that the applicable Performance Milestone has been achieved, 50% of the percentage of the Performance-Based Restricted Stock Unit Award subject to such Performance Milestone will vest (the date of such determination, the “Achievement Determination Date”). The remaining 50% of the percentage of the PSU award will vest on the first anniversary of the Achievement Determination Date subject to the grantee’s continued service to the Company. If the first Performance Milestone set forth above is not achieved by December 31, 2026, then the full PSU award will be forfeited.

Other Benefits and Compensation

We currently provide broad-based welfare benefits that are available to all our employees, including our NEOs, including health, dental, life, vision and disability insurance. We maintain a 401(k) plan and our NEOs are eligible to participate in that plan on the

same terms as our other employees generally. These benefits represent a relatively small portion of the total compensation of our NEOs.

We do not maintain any defined benefit pension plans or nonqualified deferred compensation plans. We do not provide any perquisites to our NEOs.

PLEDGING AND HEDGING POLICIES

Under the terms of our Insider Trading Policy, our executive officers and directors are prohibited from: trading in call or put options involving our securities and other derivative securities; engaging in short sales of our securities; holding our securities in a margin account, all forms of hedging or monetizing our transactions, such as zero-cost collars and forward sale contracts and pledging company securities to secure margin or other loans.

CLAWBACK POLICY

In September 2023, we adopted a policy for recoupment of incentive compensation (the “Clawback Policy”) in compliance with the requirements of the Dodd-Frank Act, final SEC rules and applicable Nasdaq listing standards (the “final clawback rules”), which covers our current and former executive officers, including all of our NEOs. Under the Clawback Policy, in the event that we are required to prepare a restatement of our previously issued financial statements due to our material noncompliance with any financial reporting requirement under securities laws, we are required to recover (subject to certain limited exceptions described in the Clawback Policy and permitted under the final clawback rules) any cash or equity incentive-based compensation received by any current or former executive officer after the effective date of the Clawback Policy and in the three years prior to the date we are required to restate our financial statements that is in excess of the amount that would have been received based on the restated financial statements.

OUTSTANDING EQUITY AWARDS AT FISCAL 2025 YEAR-END

The following table sets forth information regarding the number of shares of common stock underlying outstanding plan awards held by each of our NEOs as of December 31, 2025: