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Amentum was founded in 2020 as a spinout of the Management Services Group of AECOM. It consisted of the non-construction parts of the company's federal work, as well as its commercial operations and maintenance business. This came as a result of a process by AECOM to realign its business to focus more clearly on the architect, engineering, and construction markets.
In March 2024, Amentum announced the completion of its merger with Jacobs Solutions 's Critical Mission Solutions and Cyber and Intelligence businesses. In September 2024, it became a publicly traded company on the NYSE under the ticker symbol "AMTM", becoming a part of the S&P 500.
On April 23, 2025, Lockheed Martin announced it had agreed to buy Amentum's Rapid Business Solutions Business for $360 million. The deal was closed in June 2025.
As of 2025, the company reported revenue of approximately $14.4 billion and a total backlog of $47.1 billion, with around 50,000 employees operating in more than 70 countries. Amentum operates through two primary business segments: digital services and global engineering.
The company was added to the Fortune 500 in 2026, ranking No. 313.
In 2026, Chief Executive Officer John Heller was elected Chair of the Professional Services Council (PSC), the principal trade association representing the federal government contracting industry.
Growth through acquisitions
As part of the strategy by its owners, Amentum has pursued acquisitions of other government contractors, including:
2020 – DynCorp
2022 – PAE