On December 3, 2020, Lu Huang resigned as a member of the Board of Directors (the ‘Board’) of Stealth BioTherapeutics Corp. (the ‘Company’), effective immediately. Dr. Huang’s decision to resign from the Board was not due to a disagreement on any matter related to the Company’s operations, policies or practices. On December 4, 2020, the Board, acting in accordance with the recommendation of the Nominating Committee of the Board, appointed Dr. Eve Slater as a Class I director and as a member of the Remuneration Committee, effective as of December 4, 2020. Dr. Slater is currently Professor of Clinical Medicine at Columbia Vagelos College of Physicians and Surgeons (P&S), where she has taught for over 35 years. She was Senior Vice President, Worldwide Policy, Pfizer Inc. form May 2007 to June 2009. Prior to that, she served as Assistant Secretary for Health in the U.S. Department of Health and Human Services from 2001 to 2003, and spent over 19 years with Merck and Co., where she was Executive Director of Biochemistry and Molecular Biology, Vice President and Senior Vice President of Clinical and Regulatory Development, and SVP of External Policy.