On May 31, 2019, Mr. Matthew J. Tachouet informed Core-Mark Holding Company, Inc. that he would not be relocating to the company’s new corporate headquarters in Westlake, Texas and would be stepping down as the company’s Secretary, Vice President and Chief Accounting Officer, effective May 31, 2019. Mr. Christopher M. Miller will re-assume the position as the company’s principal accounting officer, effective May 31, 2019. Mr. Miller has served the company as Senior Vice President and Chief Financial Officer since May 2016 and will continue to serve in these positions. Prior to his current position, Mr. Miller served as the company’s Vice President and Chief Accounting Officer from January 2007 until May 2016.