Marathon Petroleum Corporation is a leading independent refiner that converts crude oil into gasoline, diesel, jet fuel, and other refined petroleum products, distributing them through branded Marathon retail outlets, dealers, wholesalers, and jobbers to end consumers competing on price and convenience. The company also owns a controlling stake in MPLX L.P., a master limited partnership operating midstream infrastructure including gathering, processing, and transportation systems for crude oil, natural gas, and natural gas liquids serving both MPC's refineries and third-party energy producers and shippers. MPC generates revenue through refining margins driven by crude-to-product price spreads and refinery throughput, retail fuel sales, and wholesale distribution, while MPLX earns relatively stable fee-based revenue from transportation and processing contracts alongside more volatile commodity-linked revenue tied to natural gas, liquids, and crude oil prices.