On April 10, 2023, Shalini Sharp notified the Board of Directors of Sutro Biopharma, Inc. (the Company) of her resignation as a Class III director and as the Chair of the Audit Committee of the Board (the Audit Committee), effective immediately (the Resignation). Ms. Sharps resignation did not result from any disagreements with the Company's management or the Board. In connection with the Resignation, the Board appointed Heidi Hunter, a Class I director and member of the Audit Committee, as the new Chair of the Audit Committee, effective as of April 13, 2023.