As of October 2026 Marathon Petroleum has a market cap of โน12.849 Trillion. This makes Marathon Petroleum the world's 167th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Oct 9th, 2026 the market cap of Marathon Petroleum was reported to be: