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Cost Basis Information

Marathon Petroleum Corporation spin-off from Marathon Oil Corporation  - June 30, 2011

On June 30, 2011, Marathon Petroleum Corporation became an independent company following a spin-off from Marathon Oil Corporation. The holders of Marathon Oil Corporation common stock received one share of Marathon Petroleum Corporation common stock for every two shares of Marathon Oil Corporation common stock held on June 27, 2011. Cost basis information related to the spin-off.