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Mr. O'Day joined Gilead Sciences in March 2019 as Chairman of the Board of Directors and Chief Executive Officer. Prior to Gilead, Mr. O'Day served as the Chief Executive Officer of Roche Pharmaceuticals. His career at Roche spanned more than three decades, during which he held a number of executive positions in the company's pharmaceutical and diagnostics divisions in North America, Europe and Asia. He served as a member of Roche's Corporate Executive Committee, as well as on a number of public and private boards, including Genentech, Flatiron Health and Foundation Medicine. Mr. O'Day holds a bachelor's degree in biology from Georgetown University and an MBA from Columbia University. He currently serves as the Board Chair for the Pharmaceutical Research and Manufacturers of America organization. He previously served on the board of directors for Galapagos NV in connection with its partnership with Gilead from 2019 to 2024.

Ms. Mercier serves as Gilead's Chief Commercial Officer, with responsibility for the global commercialization of all the company's medicines throughout the product lifecycle. Under her leadership, Gilead works to ensure that patients around the world have access to the company's transformational medicines. Ms. Mercier joined Gilead in 2019 after 25 years at Bristol-Myers Squibb, where she served in a number of executive leadership positions, including head of the U.S. business and head of the European region, gaining broad experience across geographies and in all aspects of the commercial business. In her time there, she successfully evolved the culture and drove strong commercial execution with double-digit growth and multiple launches that changed the standard of care in melanoma and renal cancers. Ms. Mercier holds a bachelor's degree in biology from the University of Montreal and an MBA from Concordia University. She currently serves on the board of directors of Neurocrine Biosciences, Inc. and the University of Southern California's Leonard D. Schaeffer Center for Health Policy and Economics. She also serves on the board of directors of Arcus Biosciences, Inc. in connection with its partnership with Gilead.

Mr. Dickinson serves as Gilead's Chief Financial Officer, responsible for the oversight of the company's global finance, corporate development, information technology, operations and strategy organizations. Mr. Dickinson joined Gilead in 2016 and prior to his current role served as head of the company's corporate development and strategy group. In that role, Mr. Dickinson drove all of Gilead's licensing, partnership and acquisition transactions and guided investments into new areas. Prior to his tenure at Gilead, Mr. Dickinson was the global Co-Head of Healthcare Investment Banking at Lazard. Earlier in his career, he served as General Counsel and Vice President of Corporate Development at Myogen, Inc., which was acquired by Gilead in 2006. Mr. Dickinson received his bachelor's degree in molecular, cellular and developmental biology from the University of Colorado at Boulder and his law degree from Loyola University of Chicago. He currently serves on the board of directors for Galapagos NV in connection with its partnership with Gilead. Mr. Dickinson also serves on the board of directors of Sutter Health, a non-profit hospital system based in California, and previously served on the board of directors of the Fosun Pharma and Kite joint venture in China, which was established in 2017.

On February 1, 2024, at a meeting of the Board of Directors of Gilead Sciences, Inc., the Board increased the size of the Board from nine directors to ten directors and elected Ted W. Love, M.D., to serve on the Board, effective immediately after the close of such meeting. Dr. Love is currently chair of the Board of Directors of the Biotechnology Innovation Organization and serves on the Boards of Directors of Royalty Pharma and Structure Therapeutics. Previously, he was the President and Chief Executive Officer of Global Blood Therapeutics, Inc. where he led the company from a pre-clinical startup to a global commercial company with a focus on sickle cell disease. Prior, he was Executive Vice President, Research and Development and Technical Operations at Onyx Pharmaceuticals, Inc.; President, Chief Executive Officer and Chairman of Nuvelo, Inc.; and Senior Vice President, Development at Theravance Biopharma, Inc. He began his biotech career at Genentech. Dr. Love earned his MD from the Yale School of Medicine and completed a residency in Internal Medicine and a fellowship in cardiology at Massachusetts General Hospital. Known for championing access to care, Dr. Love received the William E. Proudford Sickle Cell Fund 2023 Distinguished Service Award for addressing ongoing healthcare disparities facing the sickle cell disease community. In 2023, he also earned the Spirit of the Heart Health Equity Champion Award from the Association of Black Cardiologists.

Mr. Welters joined our Board in October 2020. Mr. Welters is Founder, Chairman and Chief Executive Officer of CINQ Care Inc., a physician-led, community-based ambulatory care delivery system that delivers whole person care in the home, whenever possible, to Black and Brown communities. He is also Executive Chairman of the BlackIvy Group, an organization focused on building and growing commercial enterprises in Sub-Saharan Africa, and Chairman of Somatus, Inc., a value-based kidney care company. Mr. Welters founded AmeriChoice in 1989 and upon acquisition by UnitedHealth Group (UHG) in 2002, joined UHG as Senior Adviser to the Office of the Chief Executive Officer, Executive Vice President and Member of the Office of the Chief Executive Officer, until retiring in 2016. He currently serves on the board of directors of Loews Corporation and the Carlyle Group. Mr. Welters previously served on the board of directors of West Pharmaceutical Services, Inc. from 1997 to 2016, and C.R. Bard, Inc. from 1999 to 2017. He is Trustee Emeritus of the Morehouse School of Medicine Board of Trustees, Chairman Emeritus of the Board of New York University School of Law, Vice Chairman of the Board of New York University, a Trustee of NYU Langone Medical Center, Vice Chair of the John F. Kennedy Center for the Performing Arts and a founding member of the National Museum of African American History and Culture.

Ms. Kramer joined our Board in August 2016. Ms. Kramer was Executive Vice President and Chief Financial Officer of Cisco Systems, Inc., a worldwide technology leader, from 2015 until her retirement in 2020. Prior to that, she was Senior Vice President of Corporate Finance at Cisco. She previously served as Vice President and Chief Financial Officer of GE Healthcare Systems and Chief Financial Officer of GE Healthcare Biosciences. Ms. Kramer has also worked in GE's Corporate Headquarters, Transportation Systems and Aerospace divisions. She currently serves on the board of directors of Snowflake Inc. and Coinbase, Inc.

Dr. Horning joined our Board in January 2020. Dr. Horning was the Chief Medical Officer and Global Head of Product Development of Roche, Inc., until her retirement in 2019. During her 10-year career at Roche and Genentech, she helped bring 15 new medicines to patients in disease areas including cancer, multiple sclerosis, influenza and blindness. Prior to her career at Roche, Dr. Horning spent 25 years as a practicing oncologist, investigator and tenured professor at Stanford University School of Medicine, where she remains a professor of medicine emerita. From 2005 to 2006, she served as President of the American Society of Clinical Oncology. Dr. Horning was recognized as the 2020 Healthcare Businesswomen's Association Woman of the Year. She was also selected as the 2017 recipient of the Duane Roth Memorial Award, an honor dedicated to leaders in healthcare, whose work has overcome numerous scientific obstacles to create new paradigms in research and treatment. Dr. Horning previously served on the board of directors of Foundation Medicine, Inc. from 2015 to 2018 and EQRx, Inc. from 2021 to 2023. She currently serves on the board of directors of Moderna, Inc., Olema Pharmaceuticals, Inc. and Revolution Medicines, Inc.

Dr. Barton joined our Board in January 2018. Dr. Barton is the John G. Kirkwood and Arthur A. Noyes Professor of Chemistry Emerita in the Division of Chemistry and Chemical Engineering at the California Institute of Technology, where she was a member of the faculty for more than 30 years and served as the Norman Davidson Leadership Chair of the division from 2009 to 2019. She previously served on the board of directors for both Dow Inc. and The Dow Chemical Company, and was a member of the Board and Materials Advisory Committee of DowDupont Inc. Dr. Barton founded and served on the board of directors of GeneOhm Sciences Inc., a molecular diagnostics company acquired by Becton, Dickinson and Company, and was a member of Gilead's Scientific Advisory Board from 1989 to 2007. She is a member of the National Academy of Sciences, the National Academy of Medicine and the American Philosophical Society. In 2021, Dr. Barton was elected as a Vice President of the American Philosophical Society. Dr. Barton received the 2010 National Medal of Science for her discovery of new chemistry of the DNA helix and the 2015 Priestley Medal, the highest award of the American Chemical Society.

Mr. Manwani joined our Board in May 2018. Mr. Manwani is a Senior Operating Partner for Blackstone Inc., a global investment firm, and has advised select Blackstone portfolio companies since 2015. He was previously Chief Operating Officer of the Unilever Group from 2011 until his retirement in 2014. Mr. Manwani joined Unilever in 1976 as a management trainee in India and held several senior management roles around the world, including overseeing Unilever's businesses in North America, Latin America, Asia and Africa. Mr. Manwani currently serves on the board of directors of Whirlpool Corporation. He also serves on the board of directors of EDBI Pte Ltd., Tata Sons Private Limited and Alinamin Pharmaceutical Co. Ltd., a private Blackstone portfolio company in Japan, and is the Chairman of the Executive Board of the Indian School of Business. He previously served as the Non-Executive Chairman of Hindustan Unilever Limited from 2005 to 2018, and on the board of directors of Singapore Economic Development Board from 2013 to 2019. Mr. Manwani also previously served on the board of directors of Pearson plc from 2013 to 2018, Nielsen Holdings plc from 2015 to 2021 and Qualcomm Incorporated from 2014 to 2022.

Dr. Bluestone joined our Board in December 2020. Dr. Bluestone is the President and Chief Executive Officer of Sonoma Biotherapeutics, Inc., a clinical-stage biotechnology company developing engineered regulatory T cell therapies to treat serious autoimmune and inflammatory diseases. He has held this role since 2019. From 2015 to 2019, he led the Parker Institute for Cancer Immunotherapy as President and Chief Executive Officer. Dr. Bluestone is the A.W. and Mary Margaret Clausen Distinguished Professor Emeritus in the Diabetes Center at University of California San Francisco, where he has been a member of the faculty and served in various other roles for over 20 years, including the Director of the Diabetes Center from 2000 to 2019. He is an international leader in the field of immunotherapy and has published more than 500 papers over nearly four decades focused on understanding the basic processes that control T-cell activation and immune tolerance in autoimmunity, organ transplantation and cancer. His research has led to the development of multiple immunotherapies, including the first medicine approved by the U.S. Food and Drug Administration (FDA) to delay/prevent autoimmune Type 1 diabetes and the first FDA-approved checkpoint inhibitor for the treatment of metastatic melanoma and other cancers. Dr. Bluestone was the founding director of the Immune Tolerance Network, the largest National Institutes of Health-funded multicenter clinical immunology research program, testing novel immunotherapies in transplantation, autoimmunity and asthma/allergy. He served as a member of the Blue Ribbon Panel, appointed by then Vice President Joe Biden, as a member of the National Cancer Moonshot Task Force. Dr. Bluestone is a member of the National Academy of Medicine and American Academy of Arts and Sciences, was a recipient of the prestigious Guggenheim Fellowship, and previously served as the Ludwig Professor and Director of the Ben May Institute at the University of Chicago. He previously served on the board of directors of Provention Bio, Inc. from 2013 to 2022.

Mr. Rodriguez joined our Board in June 2020. Mr. Rodriguez is the Chief Executive Officer of DaVita Inc., a Fortune 500 company providing healthcare services to kidney disease patients throughout 12 countries. He assumed his current role with DaVita in 2019, building on his more than 20 years of increasing company leadership and commitment to transforming care delivery for patients with kidney disease - from the earliest stages through transplantation. From 2014 to 2019, he was the CEO of DaVita Kidney Care, the company's business unit that treats patients with kidney failure and end-stage renal disease. Mr. Rodriguez is recognized for his vision and leadership in transforming how kidney care is delivered and accelerating the digital transformation to improve patients' lives while lowering costs for the health care system. He currently serves on the board of directors of DaVita.

On August 10, 2025, the Board of Directors of Gilead Sciences, Inc., a Delaware corporation, appointed Erin Burkhart as Senior Vice President, Controllership and principal accounting officer of the Company, effective as of September 22, 2025. Ms. Burkhart has served as Group Vice President and Chief Accounting Officer of BioMarin Pharmaceutical Inc., a biotechnology company, since May 2022. Ms. Burkhart previously worked at Eli Lilly and Company, a pharmaceutical company, from August 2014 to April 2022, where she held various accounting and finance roles of increasing responsibility during her tenure. Ms. Burkhart started her career in public accounting in 2001 with Arthur Andersen and Deloitte before serving in accounting and finance roles with various other companies. Ms. Burkhart is a licensed certified public accountant and holds a B.S. in Accounting from Butler University.

Ms. Keeley M. Cain Wettan, Executive Vice President, Legal and Compliance and General Counsel

Dr. Berger serves as Gilead's Chief Medical Officer, responsible for the company's leading virology, oncology and inflammation pipeline, as well as its global development and medical affairs organizations. Together with the leadership team, he works to advance clinical development strategies and programs with the goals of changing the trajectory of disease and transforming care for patients and communities around the world. Dr. Berger is a board-certified internist, hematologist and oncologist with more than 25 years of extensive experience in developing and delivering innovative medicines across a broad range of therapeutic areas. He joined Gilead in 2025 after serving as Senior Vice President and Global Head of Development at Sanofi, where he led clinical development for therapeutic areas that included immunology, hematology, oncology, neuroscience, rare diseases, diabetes and cardiovascular medicine. Prior to Sanofi, Dr. Berger served as Executive Vice President and Global Head of Research & Development at Atara Biotherapeutics, as well as development and medical affairs roles at Genentech, Bayer Healthcare Pharmaceuticals and Amgen. He is Professor of Medicine at the University of Freiburg Hospital in Freiburg, Germany. He completed his medical training in Freiburg, Germany; Basel, Switzerland; and Chicago and holds a M.D. and Ph.D. from the Albert-Ludwigs University School of Medicine. He currently serves on the board of directors of Arcus Biosciences, Inc. in connection with its partnership with Gilead.