On March 4, 2021, Patrick Balthrop, a director of Personalis, Inc. resigned as a member of the Company's Board of Directors (the Board"), which resignation became effective on March 5, 2020. Mr. Balthrop's resignation was not the result of any disagreement or dispute with the Company. On March 5, 2021, upon recommendation of the Nominating and Corporate Governance Committee of the board appointed Woodrow (Woody) A. Myers, Jr., M.D., to the Board as a Class I director, which appointment became effective on March 6, 2021. Dr. Myers' term will expire, along with the terms of the other Class I directors, at the Company's annual meeting of stockholders in 2023. The Board also appointed Dr. Myers to serve as a member of the Nominating Committee.