Amentum is a large U.S. government services contractor providing advanced engineering and technology solutions across defense, intelligence, space, environmental remediation, and nuclear. About 81% of revenue comes from direct U.S. government contracts, with the balance from international governments and commercial customers. Amentum was formed in September 2024 through a Reverse Morris Trust merger combining Legacy Amentum (formerly AECOM's management services business) with Jacobs Solutions' Critical Mission Solutions segment, and began trading on the NYSE under ticker "AMTM." Amentum operates two segments: Digital Solutions (~38% of revenue), covering intelligence analytics, cybersecurity, space systems, and next-gen IT; and Global Engineering Solutions (~62%), covering environmental remediation, nuclear engineering, platform sustainment, and supply chain management. Amentum is asset-light, with revenue driven primarily by labor hours from engineers and cleared personnel deployed on government contracts. About 63% of revenue is on cost-plus contracts, 24% fixed-price, and 13% time-and-materials. Key customers include the DOE, DOD, NASA, the U.S. Intelligence Community, and allied governments including the U.K. and Australia. A meaningful portion of work is performed through unconsolidated joint ventures, particularly in nuclear and environmental remediation. Amentum holds a $47B backlog, providing roughly 3x revenue in forward visibility. Management targets growth in three areas: space systems, critical digital infrastructure (including hyperscaler data centers and 5G), and global nuclear energy, which together represent the higher-margin portions of the portfolio.