Marathon Petroleum Corporation (MPC) is a petroleum product refiners, transporters and marketers in the United States. The Company operates in three segments: Refining & Marketing, Speedway and Pipeline Transportation. Marathon Petroleum�s refining, marketing and transportation operations are concentrated in the Midwest, Gulf Coast and Southeast regions of the United States. MPC has two retail brands: Speedway and Marathon. The Company owned and operated six refineries in the Gulf Coast and Midwest regions of the United States with an aggregate crude oil refining capacity of approximately 1.2 million barrels per calendar day as of December 31, 2011. Effective as of June 30, 2011, MPC was separated from Marathon Oil Corporation (Marathon Oil) and became an independent company in a spin-off transaction.