On January 27, 2021, the Board of Directors of Gritstone Oncology, Inc. appointed James Cho, the Company’s Vice President of Finance as the Company’s Principal Accounting Officer. Mr. Cho has served as the Company’s Vice President of Finance since November 2019. Prior to joining the Company, Mr. Cho served as the Corporate Controller of UNITY Biotechnologies, Inc. from October 2016 until joining Gritstone. Prior to that Mr. Cho served as Corporate Controller of Kodiak Sciences, Inc. from September 2015 until joining UNITY, and in various roles, including Corporate Controller, at KaloBios Pharmaceuticals, Inc. In addition, the Board appointed Dr. Andrew Allen, the Company’s Chief Executive Officer, as the interim principal financial officer. Dr. Allen has served as the Company’s President and Chief Executive Officer since its founding in August 2015.