On June 29, 2023, Simon Bates was appointed to serve, effective July 3, 2023, as an independent director of the Board of Directors of U.S. Silica Holdings, Inc., bringing the number of directors serving on the Board to seven. Mr. Bates was also appointed as an independent member of the Board’s Compensation Committee and Nominating & Governance Committee. Mr. Bates will serve as a director until the next annual meeting of stockholders and will be subject to election by the vote of stockholders at such meeting.

Mr. Bates has served as CEO of Argos USA, since October 2022. Prior to his role at Argos USA, Mr. Bates held the position of President and Chief Executive Officer of GCP Applied Technologies Inc. from October 2020 to October 2022 where he was also a member of the Board of Directors. GCP was an NYSE-listed company and was a leading global provider of construction products, including high-performance specialty construction chemicals and building materials.

From 2017 to October 2020, Mr. Bates served as President of Infrastructure Products Group, a division of CRH plc, a manufacturer of building products and materials.