Amentum
Amentum Holdings is a U.S.-based government and commercial services contractor providing engineering, digital, defense, space, nuclear, logistics, and mission-support services.
Last updated October 30, 2026
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Overview
Amentum is a U.S.-based government and commercial services contractor whose work spans defense support, engineering, nuclear security, environmental remediation, space operations, intelligence, cybersecurity, logistics, aviation, and international stability programs. The company is headquartered in Chantilly, Virginia, and serves U.S. federal agencies, allied governments, commercial customers, and major national infrastructure programs. The business was created in 2020 through the spinout of AECOM's Management Services Group. The transaction separated AECOM's federal and other non-construction activities from its core architecture, engineering, and construction focus. Amentum's initial portfolio included federal technical services together with commercial operations and maintenance activities. It subsequently expanded through acquisitions, including DynCorp in 2020 and PAE in 2022, strengthening its aviation, logistics, international development, intelligence, and government-support capabilities. In March 2024, Amentum completed a merger with Jacobs Solutions' Critical Mission Solutions and Cyber and Intelligence businesses. That transaction materially broadened the company's digital, cyber, space, nuclear, and mission-engineering capabilities. Amentum operates principally through digital services and global engineering activities. Digital services include intelligence analysis, cybersecurity, information technology, and space-systems support. Global engineering includes nuclear cleanup, infrastructure and facility engineering, sustainment, logistics, test and evaluation, and technical operations. The company is involved in several strategically important government programs. At NASA's Kennedy Space Center, it serves as the primary contractor for Exploration Ground Systems, supporting launch infrastructure, vehicle integration, ground operations, and Artemis-related activities. It also works on U.S. military test and training ranges, Army aviation training, aircraft maintenance, range operations, and threat-reduction programs. In the nuclear sector, Amentum participates in radioactive-waste management and cleanup at U.S. Department of Energy sites, including Hanford and Oak Ridge, and provides program and project management and engineering support for nuclear projects in the United Kingdom. Amentum's international and humanitarian work has included logistics, disaster response, contingency operations, public-health infrastructure, refugee support, and development programs. Its activities have extended across Africa, the Middle East, South Asia, Latin America and the Caribbean, Europe, and Antarctica. Examples include humanitarian camps, Ebola-response facilities, roads and airstrips, refugee-support infrastructure, and disaster-risk-reduction programs. Amentum became publicly traded on the New York Stock Exchange in September 2024 under the symbol AMTM and was added to the S&P 500. The company is positioned as a large, non-equipment-producing government-services contractor, competing primarily through technical expertise, contract scale, security clearances, program-management capability, and a broad portfolio of long-duration public-sector work. Its business remains highly dependent on government procurement, contract renewals, appropriations, regulatory requirements, and the performance of large joint ventures and task orders.
History
Amentum was established in 2020 when AECOM separated its Management Services Group and related federal and commercial operations from the rest of the company. The separation reflected AECOM's decision to concentrate more closely on architecture, engineering, and construction while placing its government-services and operations businesses in a dedicated contractor. The resulting company inherited capabilities in federal program management, technical support, logistics, operations and maintenance, and commercial asset support. Amentum pursued expansion through acquisitions. Its 2020 acquisition of DynCorp added aviation, logistics, security, training, and international government-support capabilities. The 2022 acquisition of PAE further increased its exposure to intelligence, national security, international development, mission support, and logistics programs. These transactions helped turn Amentum into a diversified contractor rather than a narrowly focused engineering provider. A major transformation occurred in March 2024, when Amentum completed its merger with Jacobs Solutions' Critical Mission Solutions and Cyber and Intelligence businesses. The combination added digital transformation, cyber, intelligence, space, nuclear, and advanced mission-engineering activities. It also reinforced Amentum's position in long-term federal programs that require specialized personnel, secure facilities, technical certifications, and continuity of operations. The company's operational portfolio includes NASA's Exploration Ground Systems program at Kennedy Space Center. Through this work, Amentum supports launch infrastructure, vehicle integration, ground systems testing, and launch preparation associated with NASA's Artemis missions. It also operates and maintains defense test and training ranges, provides aviation training support for the U.S. Army, and performs aircraft maintenance and flight operations for government customers. Nuclear and environmental services form another major part of the business. Amentum participates in radioactive tank-waste management at Hanford and leads the United Cleanup Oak Ridge joint venture, which performs Department of Energy remediation and facility-decommissioning work. In the United Kingdom, the company provides program and project management for new nuclear construction at Hinkley Point C and Sizewell C and engineering support at Sellafield. Its earlier international nuclear activities included participation in the Dounreay cleanup consortium and the consortium operating the United Kingdom's Low Level Waste Repository. It has also supported decommissioning-related work connected with Fukushima Daiichi. Amentum has maintained a substantial international stability and humanitarian portfolio. Its work has included contingency logistics, construction of camps and airstrips, Ebola-response facilities, disaster management, refugee assistance, and emergency healthcare infrastructure. During Operation Allies Welcome in 2021, the company helped establish and sustain Liberty Village at Joint Base McGuire-Dix-Lakehurst for Afghan evacuees. It later supported regional disaster-management programs in Latin America and the Caribbean and provided facilities and direct-care services for unaccompanied refugee minors under U.S. government programs. In September 2024, Amentum entered the public market on the New York Stock Exchange under the symbol AMTM and became part of the S&P 500. Its subsequent strategy has combined organic growth in defense, space, digital, and nuclear services with selective portfolio changes, including the 2025 sale of Rapid Business Solutions to Lockheed Martin. The company now presents itself as a global mission-engineering and technical-services enterprise serving government and commercial customers in more than 70 countries.
- 2025
Rapid Business Solutions divestiture
[1]Amentum agreed to sell its Rapid Business Solutions business to Lockheed Martin for $360 million; the transaction closed in June 2025.
- 2025
Space Force range contract
[1]Amentum received a 10-year U.S. Space Force launch-range operations and maintenance contract with an approximately $4 billion ceiling.
- 2024
Jacobs mission-services merger closes
[1]Amentum completed its merger with Jacobs Solutions' Critical Mission Solutions and Cyber and Intelligence businesses.
- 2024
NYSE listing
[1]Amentum became publicly traded on the New York Stock Exchange under the ticker AMTM and joined the S&P 500.
- 2022
PAE acquisition
[1]Amentum acquired PAE, adding capabilities in stability operations, humanitarian assistance, development, intelligence, mission support, logistics, and federal mission services.
- 2022
Artemis I ground-operations support
[1]Amentum supported NASA's Exploration Ground Systems activities for the uncrewed Artemis I mission.
- 2020
Amentum is formed through an AECOM spinout
[1]AECOM separated its Management Services Group and related federal, technical, and commercial operations-and-maintenance activities into the newly formed Amentum business.
- 2020
DynCorp acquisition
[1]Amentum acquired DynCorp, expanding its aviation, logistics, maintenance, training, security, and international government-support capabilities.
Products and positioning
A large, mission-focused government and commercial services contractor for complex engineering, defense, space, nuclear, digital, infrastructure, and operational-support programs.
Cybersecurity, intelligence, and information technology
Digital services
Amentum's digital-services activities cover intelligence analysis, cybersecurity, information technology, digital transformation, and support for space and national-security systems. These services are generally delivered through long-term government programs requiring secure operations, specialized technical personnel, systems integration, and mission continuity, and are intended to help agencies operate, secure, analyze, and modernize complex mission environments. Amentum’s digital-services activities include intelligence analysis, cybersecurity, information technology, and support for space and national-security systems. These services are delivered primarily through government contracts and are intended to help agencies operate, secure, analyze, and modernize complex mission environments.
Engineering, infrastructure, and sustainment
Global engineering
Global engineering encompasses systems engineering, infrastructure engineering, facility operations, logistics, equipment sustainment, environmental remediation, nuclear engineering, testing, evaluation, and program management. The work supports defense installations, energy and nuclear sites, industrial infrastructure, launch infrastructure, and complex public-sector programs. Global engineering covers systems engineering, infrastructure, facilities, operations and maintenance, logistics, asset sustainment, nuclear engineering, and environmental remediation. The work spans defense installations, energy and nuclear sites, launch infrastructure, and other technically demanding government programs.
Space operations
Exploration Ground Systems support
Amentum is the main contractor for NASA's Exploration Ground Systems program at Kennedy Space Center. Its responsibilities include launch infrastructure, ground systems, vehicle integration, testing, launch preparation, and operational support for the Artemis exploration program.
Nuclear and environmental services
Nuclear cleanup and environmental remediation
Amentum provides nuclear engineering, radioactive-waste management, decommissioning, environmental restoration, and site-remediation services. Its work includes participation in Hanford waste programs, leadership of the United Cleanup Oak Ridge joint venture, and support for major U.K. nuclear construction and decommissioning projects.
Defense support and aviation
Defense range and aviation services
The company operates and maintains military test, evaluation, and training ranges and provides aviation maintenance, flight operations, and training support. Its portfolio includes Army aviation training and maintenance and operational support for government aircraft fleets. The company operates and maintains military test, evaluation, and training ranges, provides engineering sustainment and integration, supports Army aviation training, and performs aircraft maintenance and flight operations for government customers and government aircraft fleets.
International development and contingency services
Humanitarian and stability operations
Amentum supports humanitarian response, disaster management, disaster-risk reduction, refugee assistance, public-health infrastructure, medical operations, logistics, infrastructure construction, and contingency operations for U.S. government, United Nations, and international customers. Past activities have included emergency facilities, humanitarian camps, disease-response units, transport, and regional disaster-risk-reduction programs. These services include emergency facilities, logistics, disaster-risk reduction, refugee support, medical operations, infrastructure construction, and other contingency activities for U.S. government, United Nations, and international customers.
Nuclear services and environmental management
Nuclear and environmental remediation services
The company supports radioactive-waste management, nuclear cleanup, decommissioning, environmental remediation, and nuclear program management. Examples include work at Hanford and Oak Ridge in the United States and support for major United Kingdom nuclear projects.
Marketing campaigns
- 2022Latin America and Caribbean disaster-risk reduction support
Latin America · Caribbean
An Amentum subsidiary received a five-year task order from USAID to support regional disaster management and risk-reduction programs across 31 countries. The task order expanded Amentum's humanitarian and resilience-support portfolio in the region.
Outcome. The task order expanded Amentum’s humanitarian and resilience-support portfolio in the region.
- 2021Liberty Village support under Operation Allies Welcome
United States
Under Air Force Contract Augmentation Program V, Amentum helped build and sustain Liberty Village at Joint Base McGuire–Dix–Lakehurst, providing temporary housing, medical screening, and related support for Afghan evacuees. The site supported more than 16,000 Afghan evacuees according to the reference material.
Outcome. The site supported more than 16,000 Afghan evacuees according to the reference material.
- 2020COVID-19 alternate care facility support
United States
Amentum helped establish a 200-bed alternate care facility in New Jersey during the COVID-19 response. The facility formed part of the company's domestic emergency-response work.
Outcome. The facility formed part of the company’s domestic emergency-response work.
Brand decisions
2025
Sell Rapid Business Solutions to Lockheed MartinM&ABackground
Amentum agreed to divest a business unit as part of portfolio management following its expansion through major acquisitions. Amentum continued to adjust its portfolio after the Jacobs merger.
Action taken
Amentum agreed to sell Rapid Business Solutions to Lockheed Martin for $360 million, with the transaction closing in June 2025.
Aftermath
The divestiture transferred the business to a major defense-prime competitor while narrowing Amentum's portfolio. The business became part of Lockheed Martin’s portfolio.
Transaction value. $360 million (2025 transaction)
- Lockheed Martin — Lockheed Martin agreed to acquire the Rapid Business Solutions business and completed the transaction.
2024
Merge with Jacobs Critical Mission Solutions and Cyber and IntelligenceM&ABackground
Amentum pursued greater scale and broader capabilities in digital services, cyber, intelligence, nuclear, space, and mission engineering.
Action taken
The company completed its merger with Jacobs Solutions’ Critical Mission Solutions and Cyber and Intelligence businesses.
Aftermath
The combination expanded Amentum's technical portfolio and reinforced its position among large U.S. government-services contractors. The combination broadened Amentum’s federal technology and mission-support portfolio.
2020
Create a dedicated government-services contractorStrategyBackground
AECOM sought to focus its corporate portfolio more clearly on architecture, engineering, and construction while separating federal management services and related operations.
Action taken
The Management Services Group and associated non-construction activities were spun out to form Amentum.
Aftermath
Amentum became an independent platform for government technical services, operations and maintenance, and later acquisitions.
2020
Spin out AECOM’s federal and operations-services businessStrategyBackground
AECOM sought to sharpen its focus on architecture, engineering, and construction while separating federal and commercial operations-and-maintenance activities.
Action taken
The Management Services Group and related activities were formed into Amentum.
Aftermath
Amentum became an independent government and technical-services contractor and later expanded through acquisitions.
Recent events
- Unconfirmed
Amentum expands Oak Ridge operations[3]
Reported:
WKRN News 2 reports that Amentum is the latest nuclear company to expand its operations in Oak Ridge. The headline-only source does not specify the timing, scale, or nature of the expansion.
AECOM completes sale of Management Services division[4]
Reported:
AECOM completed the sale of its Management Services division to private equity firms by January 31; the division was rebranded as Amentum.
Sources4 sources
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