On March 17, 2018, Robert S. Rubin, a member of the Board of Directors of CARBO Ceramics Inc., passed away. Mr. Rubin was one of the founding shareholders of the Company. He had served as a Director since January 1998 and prior to his passing was serving on the Company’s Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee. On March 20, 2018, as a result of Mr. Rubin’s passing, the Board reduced its size to six directors.