As of January 2026 Amentum has a market cap of A$12.73 Billion. This makes Amentum the world's 2233th 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 Jan 15th, 2026 the market cap of Amentum was reported to be: