Amentum Company Profile, Products, Employees and Revenue

Amentum is one of the largest pure-play government services companies in the world, with roughly $13.9 billion in annual revenue and a workforce of around 53,000 people after its 2024 merger with Jacobs’ government business. In six years the Virginia-based firm went from an AECOM spin-off nobody could name to an S&P 500 member running nuclear cleanup sites, space programs and some of the Pentagon’s most sensitive support contracts.

~$13.9B

Annual revenue after the Jacobs merger, per company reporting

~53,000

Employees across roughly 80 countries

2020

Founded as a spin-off of AECOM Management Services

NYSE

Listed as AMTM since September 2024

Amentum at a glance

Company fact sheet

Item	Detail
Full name	Amentum Holdings, Inc.
Headquarters	Chantilly, Virginia, United States
Founded	2020, spun off from AECOM’s Management Services segment
Employees	Around 53,000 worldwide
Revenue	Roughly $13.9 billion annually after the Jacobs merger
Ownership	Publicly traded on the NYSE as AMTM, S&P 500 member
Main fields	Defense and intelligence support, nuclear and environmental remediation, space, energy, test and training

Source: public company data; figures reflect post-merger reporting and are approximate.

How Amentum was built through mergers

Amentum is less a startup than a rollup of half a century of government services history. Its core came out of AECOM’s Management Services unit, itself the heir to URS and Washington Group. Private equity owners American Securities and Lindsay Goldberg carved it out in 2020, then moved fast, buying DynCorp International that same year to add aviation maintenance and overseas logistics, and PAE in 2022 to bulk up in intelligence and diplomatic support.

The transformative step came in September 2024, when Amentum merged with the Critical Mission Solutions and Cyber & Intelligence businesses of Jacobs in a Reverse Morris Trust deal, roughly doubling the company and taking it public on the NYSE in the process. The combined firm entered the S&P 500 shortly after listing.

What does Amentum do

Amentum sells engineering and mission support rather than hardware. Its people maintain military aircraft fleets, run test ranges and training environments, operate and clean up nuclear sites, support space launches and satellite ground segments, staff intelligence programs, and manage environmental remediation for the US and allied governments. The company groups this into two broad segments, Global Engineering Solutions and Global Intelligence & Cyber-oriented work, with customers spanning the Pentagon, Department of Energy, NASA and UK agencies.

The nuclear franchise deserves special mention. Through decades of predecessor contracts, Amentum holds leading roles at cleanup and management sites such as Savannah River and Hanford in the US and in the UK’s decommissioning market, long-duration programs that competitors find nearly impossible to dislodge.

Amentum key contracts and programs

Selected Amentum program areas

Area	What Amentum does
Missile warning and C2	$572 million contract to operate and sustain NORAD’s Cheyenne Mountain warning systems, won in 2026
Nuclear missions	Management and remediation roles at major US Department of Energy sites and UK decommissioning programs
Aviation support	Maintenance and logistics for US military aircraft fleets, DynCorp heritage work
Space	NASA engineering and operations support, launch range services
Intelligence and cyber	Cleared analytical, linguist and cyber support to US agencies
Test and training	Range operations, threat emulation and test engineering for US and allied forces

Program list drawn from public contract announcements; scopes and values change over time.

The Cheyenne Mountain award, covered in our reporting on Amentum’s $572 million NORAD contract, is typical of the franchise, low-profile, high-clearance work that renews for decades. In that market its main rivals are Leidos, KBR and Booz Allen-class integrators chasing the same cleared workforce.

Amentum revenue and ownership

Post-merger, Amentum reports annual revenue of roughly $13.9 billion, with a backlog reported around $45 billion, one of the largest in the services sector. Margins are characteristically thin, in the mid-single digits, and management’s stated priorities are integration synergies, debt reduction and steady organic growth in defense, intelligence and energy markets. The former private equity holders and Jacobs shareholders have progressively reduced stakes since the NYSE listing.

Amentum outlook for 2026

Amentum enters 2026 with tailwinds in nuclear modernization, space operations and missile warning, all budget lines growing faster than the Pentagon average. The risk ledger includes integration fatigue from a decade of mergers, recompete pressure on legacy DynCorp and PAE contracts, and a US government efficiency push that has squeezed some services spending. On balance, scale and incumbency favor it, few competitors can bid the breadth of work Amentum now covers.

Editor’s read

Amentum is what the services consolidation wave was building toward, a firm big enough to matter to markets yet almost invisible to the public. Its challenge is proving that a company assembled from four heritages can grow organically, not just by acquisition, and the Cheyenne Mountain class of wins suggests it can.

Amentum frequently asked questions

What does Amentum do?

It provides engineering, logistics, nuclear, space, intelligence and test support services to the US and allied governments, rather than manufacturing weapons.