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Create free account to monitor MPCheadquartered in findlay, ohio, marathon petroleum corporation (mpc), together with its subsidiaries, including marathon petroleum company lp and speedway llc, is one of the largest petroleum product refiners, marketers and transporters in the united states. mpc is the nation’s fourth-largest refiner and the largest refiner in the midwest. mpc’s refining, marketing and transportation operations are concentrated primarily in the midwest, gulf coast and southeast regions of the u.