As of December 2025 Amentum has a market cap of ยฃ5.34 Billion. This makes Amentum the world's 2478th 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 4th, 2025 the market cap of Amentum was reported to be: