As of December 2025 Marathon Petroleum has a market cap of โฌ42.45 Billion. This makes Marathon Petroleum the world's 470th 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 Dec 22nd, 2025 the market cap of Marathon Petroleum was reported to be: