Marathon Petroleum vs aetna

About

Marathon Petroleum Corporation is a Findlay, Ohio-based petroleum refining and midstream company — publicly traded on the New York Stock Exchange (NYSE: MPC) as an S&P 500 Energy component — operating the largest crude oil refining system in the United States with 13 refineries and approximately 3 million barrels per day of crude oil processing capacity across Texas, Louisiana, Illinois, Michigan, Ohio, North Dakota, California, and Washington, along with a majority ownership interest in MPLX LP (NYSE: MPLX), a midstream pipeline, terminal, and marine vessel MLP that gathers, processes, transports, and stores crude oil, natural gas, and petroleum products. In a defining leadership development, Marathon Petroleum's board elected CEO Maryann T. Mannen as Chairman of the Board effective January 1, 2026, succeeding Michael Hennigan who retired after leading the company through the Speedway divestiture and pandemic recovery — consolidating corporate governance leadership in Mannen following her tenure as CEO during which she managed the company's operations and capital allocation strategy. Marathon Petroleum's large-scale refining system (including the Galveston Bay refinery in Texas City as the largest US refinery at 631,000 barrels/day) processes crude oil into gasoline, diesel, jet fuel, and specialty products distributed through branded Speedway (sold to 7-Eleven in 2021) and independent dealer networks and MPLX's logistics infrastructure.