Altimmune ALT

Jerome Durso has served as a member of our Board of Directors since February 2025. Mr. Durso became Chairman of the Board on August 12, 2025. Effective January 1, 2026, Mr. Durso was appointed as President and Chief Executive Officer. Mr. Durso has over 30 years of experience in building and leading commercial and business operations in life sciences organizations both in the United States and abroad. He is a public company executive with long-term track record of success working at the intersection of strategy and operations driving results across diverse business models and therapeutic areas spanning rare disease, mass markets, specialty and hospital. Mr. Durso most recently served as the Chief Executive Officer and a member of the Board of Directors of Intercept Pharmaceuticals, a company focused on rare and serious liver diseases. He built a rare disease franchise, transformed the corporate strategy and ultimately led the company through its successful acquisition by Alfasigma. Prior to becoming CEO, Mr. Durso had served as Intercept's Chief Operating Officer from 2017 until his promotion in 2021. Prior to joining Intercept, Mr. Durso spent the majority of his career at Sanofi (Nasdaq: SNY) a global pharmaceutical company, where he most recently served as Senior Vice President, Chief Commercial Officer of the Global Diabetes Division before departing in 2015. Prior to that, Mr. Durso was Senior Vice President, Chief Commercial Officer of Sanofi's US pharmaceuticals business and also served in a number of commercial leadership roles of increasing responsibility in business unit and brand management, marketing and sales since he first joined Sanofi in 1993. Mr. Durso earned his BBA, Marketing from the University of Notre Dame.

Christophe Arbet-Engels, M.D., Ph.D. currently serves as Chief Medical Officer of the Company. Dr. Arbet-Engels joined Altimmune in October 2025, a seasoned medical professional with more than 30 years of experience in strategic global drug discovery, development, and commercialization across a broad range of therapeutic areas including gastroenterology, cardiovascular-metabolism, neurology, oncology, and rare and orphan diseases. He previously served as Chief Medical Officer at several life science companies, including from August 2023 until September 2025 at X4 Pharmaceuticals, from July 2021 until August 2023 at Neurogastrx, from January 2020 to April 2021 at Millendo Therapeutics, and from spring 2017 to fall 2019 at Poxel Pharmaceuticals, where he provided research and development leadership, advancing multiple candidates from pre-clinical through to late-stage clinical trials and assisting with both financial and strategic partnering transactions. Prior to these roles, he held a variety of senior medical and clinical positions at Biogen, Boehringer-Ingelheim Pharmaceuticals, Hoffmann-La Roche, Merck Research Laboratories, Aventis Pharmaceuticals, and Ligand Pharmaceuticals, where he led clinical development and registration, launch, and lifecycle management efforts for several new medicines, including the blockbuster therapies LANTUS and JARDIANCE. Dr. Arbet-Engels has also served in research and educational roles at The Salk Institute for Biological Studies, University of Paris VI, and the Assistance Publique, Hospitals of Paris, and currently serves as a Member of the Board of Tutors in Biochemical Sciences at Harvard University. He received his MD and PhD in internal medicine/endocrinology-metabolism from the University of Paris, France, and completed his MBA in Finance at Rutgers University.

M. Scot Roberts, Ph.D. currently serves as Chief Scientific Officer of the Company. Dr. Roberts joined Altimmune in December 2012 and has over 25 years of biologics development experience, most recently at ImQuest BioSciences, Inc., where as Chief Scientific Officer from November 2010 until November 2012, he was responsible for managing scientific operations. Dr. Roberts held key positions at Wellstat Biologics Corporation from August 1996 until October 2010, including Director of Research and Development where he was responsible for development of a portfolio of biologic candidates in oncology including a clinical stage oncolytic virus asset. He is an inventor on twelve patent and patent application families, and author of numerous publications in peer-reviewed journals. Dr. Roberts has been an invited speaker at international conferences where he chaired a variety of scientific sessions. Dr. Roberts received an M.S.in Chemistry from Illinois State University and a Ph.D. from the Johns Hopkins School of Medicine, Department of Pharmacology and Molecular Sciences.

Catherine Sohn, Pharm D. has served as a member of our Board of Directors since March 2023. Dr. Sohn currently serves on the board of directors of Maze Therapeutics (Nasdaq: MAZE), a clinical-stage biopharmaceutical company, since 2021. Dr. Sohn has also served on the board of directors of Jazz Pharmaceuticals, a public biopharma company from 2012 until July 2024, Rubius Therapeutics, a public biopharmaceutical company from 2018 until 2023 and Axcella Health, a public biotechnology company from January 2019 until February 2023. Dr. Sohn was formerly senior vice president of worldwide business development, and a member of the global executive committee at GlaxoSmithKline's Consumer Healthcare division, where she led U.S. and global transactions and prior to that was Vice President of Strategic Product Development at SmithKline Beecham Pharmaceuticals, Cardiovascular, Pulmonary and Metabolic Therapeutic Areas. As an entrepreneur in a larger pharmaceutical company, Dr. Sohn started the SmithKline Beecham U.S. Vaccine Business, built the team, and led the pre-launch planning and commercialization of SB's first vaccine in the U.S. and helped shape the global vaccine portfolio pipeline as a member of the International Vaccine Steering Committee. Subsequently, she led pre-launch planning and the U.S. commercialization of the company's billion-dollar neuroscience product and was a member of the Global CNS Product Strategy Team. Since retiring from GlaxoSmithKline, Dr. Sohn has advised CEOs and boards of life science companies on strategy, strategic product development, partnering, mergers and acquisitions, commercialization of new medicines and vaccines and culture, in her role as President of Sohn Health Strategies. Dr. Sohn received her Doctor of Pharmacy degree from the University of California, San Francisco, a Corporate Directors Certificate from Harvard Business School, a Certificate of Professional Development from Wharton, a Certificate from UC Berkeley Law for environmental, social and corporate governance, has attended Stanford Directors College and is a Certified Licensing Professional Emeritus. Dr. Sohn is also an Adjunct Professor at the University of California, San Francisco.

Philip L. Hodges has served as a member of our Board of Directors since May 2017, when he was appointed to the Board in connection with the completion of the Merger, and was first elected to Private Altimmune's board of directors in September 2003. Mr. Hodges is Managing Partner of Redmont & Company, a private investment bank based in Birmingham, Alabama, which he joined at its inception in 1997. Redmont & Company is a co-founder of Private Altimmune. Mr. Hodges' focus is on investment and advisory services for emerging growth businesses within the health care, life science and technology sectors. He currently serves as a director for several of the firm's portfolio companies. Mr. Hodges holds a Bachelor of Science in Business Administration from the Brock School of Business at Samford University.

Wayne Pisano has served as a member of our Board of Directors since August 2018. Mr. Pisano also has served on the board of directors of Oncolytics Biotech Inc. (Nasdaq: ONCY), a biotechnology company, since May 2013. Mr. Pisano served on the board of directors of Provention Bio, Inc. (Nasdaq: PRVB), a biopharmaceutical company, from April 2018 until April 2023 when it was acquired by Sanofi, and IMV INC. (Nasdaq: IMV) a biopharmaceutical company from October 2011 until March 2021. Mr. Pisano served as president and Chief Executive Officer of VaxInnate Corporation, a biotechnology company, from January 2012 until November 2016. Mr. Pisano joined Sanofi Pasteur in 1997 and was promoted to President and Chief Executive Officer in 2007, the position he successfully held until his retirement in 2011. He has a Bachelor of Science in biology from St. John Fisher College, New York and an MBA from the University of Dayton, Ohio.

Mitchel Sayare, Ph.D. has been a member of the Board of Directors since April 2010. Dr. Sayare became Chairman of the Board in January 2018 and served as Chairman of the Board until August 12, 2025. Dr. Sayare also served as Executive Chairman from June 2018 to November 2018. Until 2010, Dr. Sayare served as the Chairman of the Board of public company ImmunoGen, Inc. (Nasdaq: IMGN) (a position he had held since 1989). In addition, he served as ImmunoGen's Chief Executive Officer from 1986 to December 31, 2009, and as its President from 1986 to 1992, and from 1994 to July 2008. Prior to joining ImmunoGen, he served as Vice President of Development of Xenogen from 1982 to 1985. Prior to that he was Assistant Professor of Biophysics and Biochemistry at the University of Connecticut. Dr. Sayare earned a Ph.D. in biochemistry from Temple University School of Medicine. Dr. Sayare is chairman of the boards of directors of AutoIVF, Inc. and of MassPay Holdings, Inc., and is a director of Energesis, Inc. and Advanced Aesthetic Technologies, Inc., all privately-held companies.

John M. Gill has served as a member of our Board of Directors since August 2004. Mr. Gill served as PharmAthene's President and Chief Executive Officer from March 2015 until the completion of the Merger in May 2017. From 2003 to 2013, Mr. Gill served as the President, Chief Executive Officer, co-founder and a Director of TetraLogic Pharmaceuticals Corporation, a biopharmaceutical company. Mr. Gill has previously held positions at 3 Dimensional Pharmaceuticals and SmithKline Beecham. After serving in the United States Marine Corps, Mr. Gill earned a B.A. in Accounting and Economics from Rutgers University.

Klaus O. Schafer, M.D., MPH, has served as a member of our Board of Directors since May 2017, upon completion of the Merger. Dr. Schafer was first elected to Private Altimmune's Board of Directors in 2012. Dr. Schafer has over 35 years of healthcare leadership experience, having held senior positions in government and industry. As former, Acting Deputy Assistant to the Secretary of Defense for chemical and biological defense, Dr. Schafer oversaw the Department's $1.0 billion program for vaccine, therapeutics, medical device and sensor development and was instrumental in advancing research into human immune response. As former U.S. Air Force Assistant Surgeon General, Dr. Schafer managed all aspects of large integrated health care delivery systems, from clinical care, administration of clinics and hospitals, and oversaw large S&T portfolios, including clinical trials. Dr. Schafer served as CEO and co-founder of TessArae LLC, a biotech medical sequencing device company and Chief Medical Officer and client executive for health at CACI International. Dr. Schafer has been an independent consultant since 2002 serving a number of biotech and health-related company advisory boards and Tadpole Ventures, a private venture capital firm. Dr. Schafer earned his M.D. degree at the University of Iowa, medical boards in family practice and aerospace medicine in the Air Force, Master of Public Health at the University of Texas, and a Master of Science at the Dwight D. Eisenhower School of National Security and Resource Strategy. Dr. Schafer is CERT certified in Cybersecurity Oversight from the Carnegie Mellon University Software Engineering Institute.

Diane Jorkasky, M.D. has served as a member of our Board of Directors since May 2020. Dr. Jorkasky also currently serves as a member of the board of directors of Alzheon, Inc., a private biopharmaceutical company, since 2016. She also served on the board of directors of Q Therapeutics, Inc. from September 2013 until August 2016. From June 2014 to August 2019, she served as Executive Vice President, Chief Medical Officer and Head of Development at Complexa Inc., a clinical stage biopharmaceutical company. Prior to her Chief Medical Officer roles in biotech, Dr. Jorkasky had extensive vice president responsibilities in translational sciences and clinical development at SmithKline Beecham and Pfizer. She is on the Executive Committee and is a faculty member in the American Course in Drug Development and Regulatory Affairs and is a guest lecturer at the University of Basel European Course on Drug Development. Dr. Jorkasky received her M.D. in 1977 from the University of Pennsylvania School of Medicine and is board certified in internal medicine, nephrology and clinical pharmacology. She is a member of the Connecticut Academy of Science and Technology. Dr. Jorkasky is on the faculties of University of California, San Francisco, and Uniformed Service of Health Sciences Medical Schools, with previous faculty appointments at Yale University and the University of Pennsylvania Schools of Medicine.

Teri Lawver has served as a member of our Board of Directors since February 2025. Ms. Lawver currently serves as the Chief Commercial Officer at Celldex. Previously, she served as Principal and Owner of Thera Lifescience Advisors LLC where she advises life science companies. Ms. Lawver previously served as Executive Vice President and Chief Commercial Officer at Dexcom (Nasdaq: DXCM) from January 2023 until November 2024, where she led global commercial strategy and operations. Ms. Lawver also served as a Strategic Advisor to the CEO of Dexcom from November 2024 through March 2025. Prior to Dexcom, Ms. Lawver held a variety of leadership roles at Johnson & Johnson Corporation from 2002 to 2022, including Worldwide Vice President, Immunology from 2017 to 2022, and Global Vice President, Cardiovascular & Metabolism from 2013 to 2017. Prior to joining Johnson & Johnson, Ms. Lawver was a Consultant and Associate Principal at McKinsey & Company from 1994 to 2002, where Ms. Lawver served as a leader in the firm's global healthcare practice. Ms. Lawver holds an M.B.A. from Duke University's Fuqua School of Business, and a Bachelor of Science degree from Georgetown University.

On September 24, 2026, the Board of Directors of Altimmune, Inc. appointed Richard Menziuso as the Company's Vice President, Global Controller and Principal Accounting Officer effective as of September 29, 2026. Mr. Menziuso, has 28 years of finance and accounting experience, including 12 years in public accounting. Prior to joining the Company, Mr. Menziuso served as Vice President, Corporate Controller of Centessa Pharmaceuticals plc, a biopharmaceutical company, from 2021 until its 2026 acquisition by Eli Lilly. Prior to joining Centessa, Mr. Menziuso served as North America Controller and Head of Global Finance Customer Solutions at Thermo Fisher Scientific (NYSE: TMO) from 2019 to 2021 and as Vice President, Accounting and Controller at Axovant Gene Therapies (Nasdaq: formerly AXGT, now SIOX) from 2017 to 2019. Earlier in his career, Mr. Menziuso held finance and accounting roles at LifeCell Corporation, ConvaTec Healthcare, Tyco International, PricewaterhouseCoopers and Bristol-Myers Squibb. Mr. Menziuso received a B.B.A. in Public Accounting from Pace University and is a Certified Public Accountant and Chartered Global Management Accountant.

Gregory Weaver, M.B.A. currently serves as Chief Financial Officer (CFO) of the Company, which he joined in November 2024. He has served in executive financial leadership roles for over thirty years. Mr. Weaver has previously served as CFO of several public biotechnology companies including ILEX Oncology, Nastech, SIRNA, Poniard, Fibrocell, Celsion, Prometic, and Oryzon. Most recently, prior to joining Altimmune, he briefly served as a financial consultant since July 2024. Prior to that, Mr. Weaver served as CFO of Cognito Therapeutics from September 2023 through June 2024, and as interim CFO of Atossa Therapeutics, Inc. (Nasdaq: ATOS) from June 2023 to September 2023. Prior to that, Mr. Weaver served as CFO of BiointelliSense from October 2022 through May 2023, CFO of Atai Life Sciences N.V. (Nasdaq: ATAI) from September 2020 through September 2022, and as CFO of Eloxx Pharmaceuticals, Inc. (Nasdaq: ELOX) from September 2017 through March 2020. Mr. Weaver has served as a board director, audit committee and compensation committee chairman with several public and private biotechnology companies including Atossa, BioIntellisense, Celsion, Egalet, Noxxon, and Oryzon. Mr. Weaver currently serves as vice-chairman of HarborPath, a non-profit organization focused on providing patients with access to life-saving medications. Mr. Weaver is a United States Air Force veteran and received his M.B.A. from Boston College, B.S. in Accounting and Finance from Trinity University, and his CPA in Texas and Massachusetts.

Linda Richardson currently serves as Chief Commercial Officer of the Company, which she joined in September 2025. Ms. Richardson has more than 30 years of commercial strategy, sales, marketing, market access and reimbursement and business development experience in the pharmaceutical and biotech industries. From early 2021 until April 2024, she served as the Chief Commercial Officer and Executive Vice-President at Intercept Pharmaceutical, stepping down shortly after the company's acquisition by Alfasigma. From 2018 to 2021, she served as the SVP and Head of the Cholestasis Program at Intercept. From 2013 to 2018, she worked at Chimerix, Inc., where she ultimately held the role of Chief Strategy and Commercial Officer, overseeing marketing, market access and reimbursement, market research and analytics, forecasting, supply chain and distribution strategies, commercial operations, product communications, and sales. From 2008 to 2013, Ms. Richardson held commercial leadership roles of increasing responsibility at Sanofi, where she was a Vice President and led the company's global GLP-1 diabetes franchise. Prior to joining Sanofi, Ms. Richardson held roles of increasing responsibility at both Reliant Pharmaceuticals and GlaxoSmithKline, including Vice President of Marketing. Ms. Richardson holds a bachelor's degree in English from the University of Pennsylvania.

Raymond M. Jordt, M.B.A. currently serves as Chief Business Officer of the Company, which he joined in January 2023. Mr. Jordt is an accomplished executive with over twenty-five years of experience in the pharmaceutical industry. Prior to joining Altimmune, he spent nearly two decades in various corporate and business development roles, including most recently as Head of Transactions at Eli Lilly and Company from August 2020 through December 2022, and prior to that as Senior Director, Corporate and Business Development from 2016 through July 2020. During his tenure at Lilly, he led acquisitions, in/out-licensing, divestitures, collaborations, options and equity investments with biotech and pharma at all stages of development. He has worked across multiple therapeutic areas, including obesity, diabetes, CNS, immunology, dermatology and pain. His efforts led to four approved products and reshaped the portfolios of key business units. Mr. Jordt received an M.B.A. from Indiana University, an M.S. in Biomedical Engineering at the University of Memphis and a B.S. in Biomedical Engineering from Arizona State University.