On March 1, 2018, Core-Mark Holding Company, Inc. (the “company”) announced that Mr. Thomas B. Perkins would be retiring as Chief Executive Officer and stepping down as a member of the Board of Directors of the company (the “Board”), to be effective as of June 30, 2018. Mr. Perkins has served the company as Chief Executive Officer and as a member of the Board since January 2013. The company has named Mr. Scott McPherson as Chief Executive Officer to succeed Mr. Perkins.

In connection with his promotion, Mr. McPherson will also be appointed to the Board effective June 30, 2018. Mr. McPherson has served as the company's President and Chief Operating Officer since October 2017. Prior to his current position, Mr. McPherson served as Senior Vice President of Business Operations and Strategic Opportunities from January 2015 to October 2017, and as Senior Vice President- Corporate Development from December 2009 to December 2014.