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Cost Basis Calculator

Calculating the cost basis of your Marathon Oil Corporation common stock to report capital gains taxes to the IRS can be a difficult and time-consuming process. To assist our shareholders in calculating their cost basis, Marathon Oil is providing a hyperlink from our website to NetBasis Cost Basis system.

For a fee, NetBasis will automatically calculate the cost basis for your Marathon Oil stock, by adjusting for any corporate actions or dividend reinvestments, if applicable. To use NetBasis, you will need your purchase/acquisition/sales dates and the number of shares or dollar amount acquired and/or sold on those dates.

If you have any questions about using NetBasis, you can call their 24/7 Customer Care Call Center at 1-888-552-2747 or use the Live Web Chat service located on the HELP button once you have logged on to the system.

NetBasis

Upon selecting the NetBasis icon above, you will be leaving Marathon Oil Corporation''s web site and will be redirected to the NetBasis system, which contains historical information related to the cost basis of Marathon Oil common stock. Marathon Oil receives no compensation from NetBasis or Networth Services, Inc., the owners of NetBasis. Marathon Oil shall have no liability for any information received from the NetBasis system.