As of December 2025 Amentum has a market cap of C$9.82 Billion. This makes Amentum the world's 2485th 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 20th, 2025 the market cap of Amentum was reported to be: