On the Record · Amentum Holdings
Amentum Holdings subsidiaries, as it lists them
The subsidiaries Amentum Holdings lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| AC First, LLC | Delaware |
| Aeroptic, LLC | Massachusetts |
| Aerospace Testing Alliance | Tennessee |
| Afghan Holdco LLC | Delaware |
| Africa Expeditionary Services LLC | Delaware |
| AGS Sudan Limited | South Sudan |
| Airport & MRO Facilities Nigeria Limited | Nigeria |
| Amazon Finance LLC | Delaware |
| Amentum (UK) Ltd. | United Kingdom |
| Amentum Australia Pty Limited | Australia |
| Amentum Brazil Ltda | Sao Paulo |
| Amentum Business Support Services Inc. | Philippines |
| Amentum Clean Energy France SAS (U.K.) | France |
| Amentum Clean Energy International Limited | United Kingdom |
| Amentum Clean Energy Limited | United Kingdom |
| Amentum Clean Energy s.r.o | Czech Republic |
| Amentum Commercial Operations, Inc. | Delaware |
| Amentum Digital Infrastructure, Inc. | New Jersey |
| Amentum E&C Limited | United Kingdom |
| Amentum Enterprise Asset Solutions Construction Limited | United Kingdom |
| Amentum Enterprise Asset Solutions Limited | United Kingdom |
| Amentum Environment & Energy, Inc. | Ohio |
| Amentum Facility Management UK Ltd. | United Kingdom |
| Amentum Global Services - Australia Pty Ltd | Australia |
| Amentum GmbH | Germany |
| Amentum Government Services Holdings LLC | Delaware |
| Amentum Government Services Holdings Sub LLC | Delaware |
| Amentum Government Services Parent Holdings LLC | Delaware |
| Amentum Government Services, Inc. | Delaware |
| Amentum Holdings LLC | Delaware |
| Amentum IDC SARL | France |
| Amentum International Holdings UK Ltd. | United Kingdom |
| Amentum International Nuclear Services Ltd | United Kingdom |
| Amentum Japan K.K. | Japan |
| Amentum Mitie Pacific LLC | Delaware |
| Amentum Multiconsult Decommissioning ANS | Norway |
| Amentum N&E Holdings LLC | Delaware |
| Amentum N&E UK Holdings Limited | United Kingdom |
| Amentum National Security Programs, Inc. | Virginia |
| Amentum New York Inc. | New York |
| Amentum Nuclear & Environment Holdings, Inc. | Delaware |
| Amentum Operaciones Comerciales Mexico | — |
| Amentum Operaciones Comerciales CR | Costa Rica |
| Amentum Parsons Logistics Services LLC | Delaware |
| Amentum Services Canada, Inc. | Canada |
| Amentum Services Colombia S.A.S. | Colombia |
| Amentum Services SDN. BHD. | Malaysia |
| Amentum Services, Inc. | Delaware |
| Amentum Singapore Pte. Ltd. | Singapore |
| Amentum Slovakia s.r.o. | Slovakia |
| Amentum South Africa PTY Ltd. | South Africa |
| Amentum Spaceport LLC | Delaware |
| Amentum Special Mission Services, Inc. | Pennsylvania |
| Amentum SPV LLC | Delaware |
| Amentum SRL | Argentina |
| Amentum Technical Services LLC | Delaware |
| Amentum Technology, Inc. | Tennessee |
| Augility Pty Limited | Australia |
| Augility Services Pty Limited | Australia |
| Automotive Testing Operations, LLC | Delaware |
| Avicom do Brasil Manutencao de Aeronaves Ltda | Brazil |
| Blue Canopy Group, LLC | Virginia |
| Bravour Leistungen GmbH | Germany |
| Buffalo Group LLC | Delaware |
| Carondelet Energy Readiness LLC | Delaware |
| Casals & Associates, Inc. | Virginia |
| Centra Services Corporation | Massachusetts |
| Centra Technology, Inc. | Maryland |
| Central Plateau Cleanup Company LLC | Delaware |
| CH2M Hill BWXT West Valley, L.L.C | Delaware |
| CH2M HILL Plateau Remediation Company | Washington |
| CH2M-WG Idaho, LLC | Idaho |
| Courage Services, Inc. | Virginia |
| Critical Mission Services sp. z.o.o | Poland |
| Culpeper National Security Solutions LLC | Delaware |
| Cumbria Nuclear Solutions Limited | United Kingdom |
| D2R Services LLC | Delaware |
| Defense Support Services International 3 LLC | Delaware |
| Defense Support Services International, LLC | Delaware |
| Delta Bridge, Inc. | Virginia |
| DTS Aviation Services LLC | Nevada |
| DynCorp Aerospace Operations LLC | Delaware |
| DynCorp International Business Services Private Limited | India |
| DynCorp International LLC | Delaware |
| DynCorp International Services GmbH | Germany |
| DynCorp International Services LLC | Virginia |
| DynCorp LLC | Delaware |
| DZSP 21 LLC | Delaware |
| DZSP 22 LLC | Delaware |
| EG&G Defense Materials, Inc. | Utah |
| Energy, Safety & Risk Consultants (UK) Limited | United Kingdom |
| Energy, Security and Technology Canada Ltd. | Canada |
| Energy, Security and Technology LLC (dba ES&T North America) | Delaware |
| Energy, Security and Technology UK Limited | United Kingdom |
| Equitas International LLC | Delaware |
| Expeditionary Logistics Services LLC | Egypt |
| Expeditionary Services Benin LLC | Cotonou |
| Fast Reactor Technology Limited | United Kingdom |
| Federal Network Systems LLC | Delaware |
| Four Rivers Nuclear Partnership, LLC | Delaware |
| Future Investment Group LLC | Egypt |
| GL Systems LLC | Delaware |
| Global Linguist Solutions LLC | Delaware |
| Global Linguist Solutions Turkey Tercüme Hizmetleri Limited Şirketi | Turkey |
| Global Management Services GmbH | Germany |
| Global Sourcing Solutions | Cayman Islands |
| Greenline Systems Canada Ulc | Canada |
| Idaho Environmental Coalition LLC | Delaware |
| InSpace 21 LLC | Delaware |
| JT4, LLC | Delaware |
| Lear Siegler Logistics International, Inc. | Delaware |
| Macfadden & Associates, Inc. | Virginia |
| Macfadden International Suarl | Tunisia |
| McNeil Security, Inc. | Virginia |
| Momentum SNC | France |
| MS Federal Services, Inc. | Nevada |
| MSFS Holdings US, Inc. | Nevada |
| MT Holding Corp. | Delaware |
| National Nuclear Corporation Limited | United Kingdom |
| NEXTGEN-H Integration Services LLC | Delaware |
| Nuclear Waste Partnership LLC | Delaware |
| Pacific Architects and Engineers, LLC | Delaware |
| Pacific Operations Maintenance Company | California |
| Pacific Research Support LLC | Delaware |
| PAE (Australia) Pty. Limited | Australia |
| PAE Applied Technologies International LLC | Delaware |
| PAE Applied Technologies LLC | Delaware |
| PAE Canada, Inc. | California |
| PAE Colombia Ltda. | Colombia |
| PAE Design and Facility Management | California |
| PAE Foundation | Bosnia and Herzegovina |
| PAE Global Support LLC | Delaware |
| PAE Government Services Colombia S.A.S. | Colombia |
| PAE Government Services Mexico, S. De R.L. De C.V. | Mexico |
| PAE Government Services, Inc. | California |
| PAE Humanitarian Response LLC | Delaware |
| PAE India Support Center LLP | India |
| PAE International | California |
| PAE ISR LLC | Delaware |
| PAE Justice Support | Virginia |
| PAE LLC | Delaware |
| PAE Logistics LLC | California |
| PAE Services Canada Inc. | Canada |
| PAE Shared Services LLC | Delaware |
| PAE Shield Acquisition Company LLC | Delaware |
| PAE Training Services, LLC | Delaware |
| PAE Worldwide Incorporated | Delaware |
| PAE-Perini LLC | Delaware |
| Phoenix Consulting Group, LLC | Alabama |
| PWR Power Projects Limited | United Kingdom |
The list is long; these are the first 150 as the company lists them. From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Amentum Holdings’s annual reports (10-K for 2025, 10-K for 2024) and the financial data it files with the SEC, as of 2025-11-25. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.