Oneok vs Marathon Petroleum
Side-by-side comparison of AI visibility scores, market position, and capabilities
Diversified midstream infrastructure with $23.7B FY2024 revenue; $18.8B Magellan acquisition 2023 adds 9,800-mile refined products pipeline; 40,000 total pipeline miles; Permian and Bakken NGL processing.
About
ONEOK, Inc. is one of the largest midstream natural gas and liquid hydrocarbons infrastructure companies in the United States, founded in 1906 as Oklahoma Natural Gas Company in Tulsa, Oklahoma, where it remains headquartered and trades on NYSE (OKE). The company generated approximately $23.7 billion in revenues for FY2024 under CEO Pierce Norton, substantially transformed by the landmark September 2023 acquisition of Magellan Midstream Partners for approximately $18.8 billion—the largest U.S. midstream deal in years—which added approximately 9,800 miles of refined products pipelines and 54 petroleum product terminals, converting ONEOK from a primarily natural gas midstream company into a diversified midstream infrastructure operator spanning both natural gas (gathering, processing, transportation, storage) and refined petroleum products (pipelines, terminals, fractionation).
Findlay OH petroleum refining (NYSE: MPC); largest US refiner 3M barrels/day, CEO Maryann Mannen elected Chairman (Jan 2026), MPLX midstream MLP, Martinez renewable diesel conversion competing with Valero and Phillips 66.
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.
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