Exhibit 21.1
LIST OF SUBSIDIARIES
KBR, INC.
Subsidiaries of Registrant as of January 3, 2025
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| NAME OF COMPANY | | COUNTRY OF INCORPORATION |
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| Affinity Capital Works Limited | | United Kingdom |
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| Affinity Flying Services Limited | | United Kingdom |
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| Affinity Flying Training Services Limited | | United Kingdom |
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| AOC International Limited | | United Kingdom |
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| Asesoria Gerencial de Recursos Humanos, S. de R.L. de C. V. | | Mexico |
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| Aspire Defence Capital Works JV | | United Kingdom |
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| Aspire Defence Finance PLC | | United Kingdom |
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| Aspire Defence Holdings Limited | | United Kingdom |
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| Aspire Defence Limited | | United Kingdom |
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| Aspire Defence Services JV | | United Kingdom |
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| Aspire Defence Services Limited | | United Kingdom |
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| Åström Logistics AB | | Sweden |
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| BE&K de Mexico, S.A. de C.V. | | Mexico |
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| BE&K, Inc. | | United States |
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| BetterKonnected Joint Venture | | Australia |
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| Blandford Offshore Services Limited | | United Kingdom |
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| Bonny 7 Project Management Company Limited | | United Kingdom |
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| Bristol Management Centre Limited | | United Kingdom |
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| Brown & Root Highlands Fabricators Limited | | United Kingdom |
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| Brown & Root Industrial Services Canada Corporation | | Canada |
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| Brown & Root Industrial Services De Mexico | | Mexico |
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| Brown & Root Industrial Services Holdings, LLC | | United States |
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| Brown & Root Industrial Services Puerto Rico C.R.L. | | Puerto Rico |
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| Brown & Root Industrial Services, LLC | | United States |
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| Catalyst Systems & Training Solutions Pty Ltd | | Australia |
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| Clearbox Systems Pty Limited | | Australia |
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| Dependable Global Solutions, LLC | | United States |
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| Eitec LTD | | United Kingdom |
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| Fasttrax Holdings Limited | | United Kingdom |
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| Fasttrax Limited | | United Kingdom |
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| Frazer-Nash Australia PTY LTD | | Australia |
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| NAME OF COMPANY | | COUNTRY OF INCORPORATION |
| Frazer-Nash Consultancy Limited | | United Kingdom |
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| Frazer-Nash Consultancy LLC | | United States |
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| FTX Logistics Limited | | United Kingdom |
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| Granherne Limited | | United Kingdom |
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| Harmonic Limited | | United Kingdom |
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| HomeSafe Alliance LLC | | United States |
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| Howard Humphreys (Kenya) Limited | | Kenya |
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| JGC-KBR Venture (In Salah Project) | | Cayman Islands |
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| KBR-Aurecon Joint Venture | | Australia |
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| KBR (Aspire Construction Ventures) Holdings Ltd | | United Kingdom |
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| KBR (Aspire Construction Ventures) Holdings No 2 Ltd | | United Kingdom |
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| KBR (Aspire Construction Ventures) Ltd | | United Kingdom |
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| KBR (Aspire Construction) Holdings Limited | | United Kingdom |
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| KBR (Aspire Construction) Holdings No.2 Limited | | United Kingdom |
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| KBR (Aspire Construction) Limited | | United Kingdom |
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| KBR (Aspire Services Ventures) Holdings Ltd | | United Kingdom |
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| KBR (Aspire Services Ventures) Holdings No.2 Ltd | | United Kingdom |
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| KBR (Aspire Services Ventures) Ltd | | United Kingdom |
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| KBR (Aspire Services) Holdings Limited | | United Kingdom |
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| KBR (Aspire Services) Holdings No.2 Limited | | United Kingdom |
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| KBR (Aspire Services) Limited | | United Kingdom |
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| KBR (I) Limited | | United Kingdom |
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| KBR (U.K.) Investments Limited | | United Kingdom |
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| KBR Abr al Bihar General Services, Trade and General Contracting, LLC | | Iraq |
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| KBR Al-Yusr Limited Company | | Saudi Arabia |
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| KBR Arabia Limited | | Saudi Arabia |
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| KBR Australia Pty Ltd | | Australia |
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| KBR Canada Ltd | | Canada |
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| KBR Charitable Foundation, Inc. | | United States |
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| KBR Conscia JV | | Australia |
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| KBR Construction Company, LLC | | United States |
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| KBR Diego Garcia, LLC | | United States |
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| KBR Employment Services Limited | | United Kingdom |
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| KBR Engineering Company, LLC | | United States |
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| KBR Engineering of North Carolina, Inc. | | United States |
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| KBR General Partner Limited | | United Kingdom |
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| KBR Gerenciamento de Projectos e Servicos de Estudos Industriais Conceituais Basicos E De. | | Brazil |
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| NAME OF COMPANY | | COUNTRY OF INCORPORATION |
| KBR GMBH | | Germany |
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| KBR Holdings Pty Ltd | | Australia |
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| KBR Holdings, LLC | | United States |
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| KBR Industrial Canada Co. | | Canada |
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| KBR Investments Limited | | United Kingdom |
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| KBR Jacobs JV (Kingsford Smith Drive Upgrade Project) | | Australia |
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| KBR Jersey Limited | | Jersey |
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| KBR Monterrey S.A. de C.V. | | Mexico |
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| KBR Overseas, Inc. | | United States |
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| KBR PNG Limited | | Papua New Guinea |
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| KBR Poland Spolka z.o.o. | | Poland |
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| KBR Property Holdings LP | | United Kingdom |
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| KBR Services, LLC | | United States |
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| KBR Services, S.A.R.L. | | Djibouti |
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| KBR Technical Services, Inc. | | United States |
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| KBR WABI LTD. | | Canada |
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| KBR Wyle Services, LLC | | United States |
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| KBR, Inc. | | United States |
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| KBR-Aurecon JV-SA Water | | Australia |
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| KBR-Aurecon JV-Water Sec | | Australia |
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| KBR-Aurecon Yarra Valley Water | | Australia |
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| KBR-NIPI Limited Liability Partnership | | Kazakhstan |
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| KBS Maritime Limited | | United Kingdom |
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| Kellogg (Malaysia) Sdn. Bhd. | | Malaysia |
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| Kellogg Brown & Root (Greenford) Limited | | United Kingdom |
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| Kellogg Brown & Root (Norway) AS | | Norway |
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| Kellogg Brown & Root (Services) Limited | | United Kingdom |
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| Kellogg Brown & Root (U.K.) Limited | | United Kingdom |
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| Kellogg Brown & Root (Ukraine) LLC | | Ukraine |
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| Kellogg Brown & Root Asia Pacific Pte Ltd | | Singapore |
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| Kellogg Brown & Root Consultancy (Malaysia) Sdn Bhd | | Malaysia |
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| Kellogg Brown & Root Engineering & Construction India Private Limited | | India |
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| Kellogg Brown & Root Engineering Consultancy LLC | | Oman |
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| Kellogg Brown & Root Engineering Corporation | | United States |
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| Kellogg Brown & Root Eurasia Limited | | Russian Federation |
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| Kellogg Brown & Root GmbH | | Germany |
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| Kellogg Brown & Root Group Limited | | United Kingdom |
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| Kellogg Brown & Root Healthcare Trustee Limited | | United Kingdom |
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| NAME OF COMPANY | | COUNTRY OF INCORPORATION |
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| Kellogg Brown & Root Holding B.V. | | Netherlands |
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| Kellogg Brown & Root Holdings (U.K.) Limited | | United Kingdom |
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| Kellogg Brown & Root Holdings Limited | | United Kingdom |
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| Kellogg Brown & Root International (MWK) Limited | | United Kingdom |
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| Kellogg Brown & Root International Group Limited | | United Kingdom |
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| Kellogg Brown & Root International, Inc. | | United States |
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| Kellogg Brown & Root International, Inc. | | Panama |
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| Kellogg Brown & Root Investment Holdings Limited | | United Kingdom |
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| Kellogg Brown & Root Limited | | United Kingdom |
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| Kellogg Brown & Root Limited-Azmi Abdullatif Abdulhadi and Abdullah Mahana Al-Moiabed Professional Company | | Saudi Arabia |
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| Kellogg Brown & Root LLC | | United States |
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| Kellogg Brown & Root Nigeria Limited | | Nigeria |
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| Kellogg Brown & Root Overseas Limited | | United Kingdom |
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| Kellogg Brown & Root Overseas Projects Limited | | United Kingdom |
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| Kellogg Brown & Root Projects Limited | | United Kingdom |
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| Kellogg Brown & Root Pty Ltd | | Australia |
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| Kellogg Brown & Root Pty Ltd - Transport for Tomorrow | | Australia |
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| Kellogg Brown & Root Pty Ltd - WaterSecure | | Australia |
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| Kellogg Brown & Root Pty Ltd & MetConnx | | Australia |
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| Kellogg Brown & Root Regional Headquarters | | Saudi Arabia |
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| Kellogg Brown & Root Saudi Ltd. Co. | | Saudi Arabia |
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| Kellogg Brown & Root Services B.V. | | Netherlands |
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| Kellogg Brown & Root Services International, Inc. | | United States |
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| Kellogg Brown & Root Services LLC | | Oman |
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| Kellogg Brown & Root Sustainable Technology Solutions Limited | | United Kingdom |
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| Kellogg Brown & Root Technology (Beijing) Co. Ltd | | China |
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| Kellogg Brown & Root Trustees Limited | | United Kingdom |
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| Kellogg France, S.A. | | France |
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| KHA Defence Solutions Pty Ltd. | | Australia |
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| Kord Technologies, LLC | | United States |
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| Labor Support Services Limited | | Cayman Islands |
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| Laurel Financial Services B.V. | | Netherlands |
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| Mantenimiento Marino de Mexico, S. de R.L. de C.V. | | Mexico |
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| MMM-SS Holdings, LLC | | United States |
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| Overseas Supply Services Limited | | United Kingdom |
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| Phoenix (U.K.) Fusion Limited | | United Kingdom |
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| PT KBR Indonesia | | Indonesia |
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| NAME OF COMPANY | | COUNTRY OF INCORPORATION |
| PT Roberts Schaefer Soros Indonesia | | Indonesia |
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| R and S Engineering (India) Private Limited | | India |
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| Semi Sub Services B.V. | | Netherlands |
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| Sigma Bravo Pty Ltd | | Australia |
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| Solutions Insurance Company | | United States |
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| Sustainable System Solutions, LLC | | United States |
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| Systra - KBR Joint Venture | | Australia |
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| Technical Staffing Resources Limited | | United Kingdom |
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| Technical Staffing Resources, LLC | | United States |
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| VIMA Bristol Limited | | United Kingdom |
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| VIMA Consultancy Limited | | United Kingdom |
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| VIMA Group Consultancy Limited | | United Kingdom |
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| VIMA Group Holdings Limited | | United Kingdom |
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| VIMA Group Services Limited | | United Kingdom |
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| Vinnell Brown & Root LLC | | United States |
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| Wyle Inc. | | United States |
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* KBR, Inc. maintains over 100 subsidiaries. Set forth above are the names of certain controlled subsidiaries, at least 50% owned, directly or indirectly, of KBR, Inc. as of January 3, 2025. The names of certain subsidiaries have been omitted from this Exhibit 21.1 in accordance with applicable rules. The omitted subsidiaries, considered in the aggregate as a single subsidiary, did not constitute a “significant subsidiary” (as defined in Rule 1-02(w) of Regulation S-X) at January 3, 2025.
