Core-Mark Announces Second Quarter 2012 Investor Call

| Source: Core-Mark Holding Company, Inc. Core-Mark Holding Company, Inc.

SOUTH SAN FRANCISCO, CA--(Marketwire - Aug 3, 2012) - Core-Mark Holding Company, Inc. (NASDAQ: CORE), announced today that it will release its earnings before the market opens on Wednesday August 8, 2012 for the second quarter ended June 30, 2012 and will host an investor call later that morning. The call will be held on Wednesday August 8, 2012 at 9:00 a.m. Pacific time and can be accessed by dialing 1-800-588-4973 using the code 32983905. The call may also be listened to on the Company's website www.core-mark.com.

An audio replay will be available for two weeks following the call by dialing 1-888-843-7419 using the same code. The replay will also be available via webcast at www.core-mark.com for approximately 90 days following the call.

Core-Mark

Core-Mark is one of the largest marketers of fresh and broad-line supply solutions to the convenience retail industry in North America. Founded in 1888, Core-Mark offers a full range of products, marketing programs and technology solutions to approximately 29,000 customer locations in the U.S. and Canada through 27 distribution centers (excluding two distribution facilities the Company operates as a third party logistics provider). Core-Mark services traditional convenience retailers, grocers, drug, liquor and specialty stores, and other stores that carry convenience products. For more information, please visit www.core-mark.com.