Who Marathon Petroleum buys from and sells to
Largest US refiner by capacity, selling fuels wholesale and through Marathon/ARCO brands; controls MPLX.
Buys from 3
- MPLXMPLXpipelines, terminals and storage under fee contracts
- EnbridgeENBpipeline delivery of Canadian heavy crude to Midwest plants
- Crude producersdomestic and imported crude feedstock
Sells to 3
- Seven & iSVNDYfuel for ex-Speedway stores under a 15-year supply deal
- Marathon and ARCO branded dealerswholesale gasoline and diesel
- Export buyers in Latin Americarefined product cargoes
Where the chain could break
- Earnings ride on crack spreads, which move with global refinery closures and outages
- Renewable fuel (RIN) compliance costs set by EPA volume mandates
Competes with
- ValeroVLOUS refining
- Phillips 66PSXUS refining and marketing
- HF SinclairDINOMid-Continent refining
- PBF EnergyPBFrefining
Mapped by hand from filings and company reporting, as of October 2026. It shows the relationships that matter most, not every contract: most are never disclosed, and agreements change.