Direct Registration Sell Program

Direct Registration is a method of recording your shares in Core-Mark in electronic book form. Book-entry means that your shares are registered in your name on the stock records of Core-Mark Holding Company, Inc. without the need for a paper stock certificate.

You may request to sell your shares at any time through your book entry account. Request can be submitted to Wells Fargo Shareowner Services via the telephone, website or in writing. There are transaction costs associated with the sale of your shares and for any electronic payment of the proceeds.

For general questions or further information, you may contact:

Wells Fargo Shareholder Services
1110 Centre Pointe Curve
Mendota Heights, MN 55120
Toll free (800)-468-9716
www.wellsfargo.com/com/shareowner_services