Where is Amentum headquartered?

Amentum is headquartered in Chantilly, VA and was founded in 2020.

What does Amentum specialize in?

Amentum works across Engineering services, Logistics, Nuclear remediation, Space operations, Cybersecurity.

Does Amentum hold government contracts?

Defense Tech Atlas links Amentum to 2 government contracts and 1 program.

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CompanyReported

Amentum

Technical services, engineering, and defense contractor serving U.S. government and allied partners.

Amentum is an American government and commercial services contractor based in Chantilly, VA, formed in 2020 as a spin-off from AECOM's Management Services group. The company provides engineering, logistics, nuclear remediation, space operations, and cybersecurity services primarily to U.S. government agencies. Amentum went public on the NYSE in September 2024 under the ticker AMTM and reported approximately $14.4 billion in revenue in fiscal 2025, with over 53,000 employees operating in more than 70 countries.

Overview

Headquarters: Chantilly, VA
Founded: 2020
Employees: 53,000+
Total funding: Public (NYSE: AMTM)
Valuation: Public (NYSE: AMTM)
Stage: Public
Status: public
Domains: Engineering services, Logistics, Nuclear remediation, Space operations, Cybersecurity
LinkedIn: www.linkedin.com/company/amentum
X / Twitter: x.com/AmentumOfficial
Website: amentum.com

Founders0

No linked records yet.

Investors0

No linked records yet.

Cap table5

Approximate ownership by holder. Indexed holders link to their records.

Holder	Instrument	Ownership
American Securities LLC (ASP Amentum Investco LP)	Common	18.04%
Lindsay Goldberg	Common	18.04%
Invesco Ltd.	Common	9.10%
BlackRock, Inc.	Common	6.90%
The Vanguard Group	Common	6.79%

Contracts2

Programs1

ProgramNational Space Test and Training Complex Innovative Technology and Engineering – Space Test and Range Capability Development (NITE-STAR)Multi-award IDIQ vehicle (15 vendors) to modernize Space Force live and synthetic test/training ranges, feeding the existing OTTI program.

Frequently asked

What does Amentum do?: Amentum is an American government and commercial services contractor based in Chantilly, VA, formed in 2020 as a spin-off from AECOM's Management Services group. The company provides engineering, logistics, nuclear remediation, space operations, and cybersecurity services primarily to U.S. government agencies. Amentum went public on the NYSE in September 2024 under the ticker AMTM and reported approximately $14.4 billion in revenue in fiscal 2025, with over 53,000 employees operating in more than 70 countries.
Where is Amentum headquartered?: Amentum is headquartered in Chantilly, VA and was founded in 2020.
What does Amentum specialize in?: Amentum works across Engineering services, Logistics, Nuclear remediation, Space operations, Cybersecurity.
Does Amentum hold government contracts?: Defense Tech Atlas links Amentum to 2 government contracts and 1 program.

Sources & citations3

Each claim links to its underlying source. Confidence reflects how directly the source supports the claim.

1
Amentum was formed in 2020 as a spinout of AECOM's Management Services Group
Wikipedia: Amentum Holdings
Verified2026-06-15
2
Amentum reported $14.4 billion in revenue for fiscal year 2025 with over 53,000 employees
Wikipedia: Amentum Holdings
Verified2026-06-15
3
Lindsay Goldberg and American Securities each hold 18.04% (43,893,904 shares, co-controlling per Stockholders Agreement); Invesco 9.10%, BlackRock 6.90%, Vanguard 6.79% — DEF 14A Security Ownership table, as of Nov 30, 2025
SEC Filing: Amentum Holdings DEF 14A
Verified2025-11-30