| | | | | | | | |
| Name of Subsidiary | | Jurisdiction of Organization |
| Avondale Engineering & Construction Company | | Delaware |
| CEMC Enterprise, LLC | | Delaware |
| Enlighten, LLC | | Maryland |
| Fleet Services Holding Corp. | | Delaware |
| Gray Research, Inc. | | Alabama |
| HII (AUS) Holding Company Pty Ltd | | Australia |
| HII (UK) International Holding Company Ltd. | | United Kingdom |
| HII (US) International Holding Company | | Delaware |
| HII Energy Inc. | | Virginia |
| HII Mission Technologies Corp. | | Delaware |
| HII Nuclear Australia Pty Ltd | | Australia |
| HII Nuclear Canada, Inc. | | Canada |
| HII Nuclear Inc. | | Delaware |
| HII Nuclear UK Limited | | United Kingdom |
| HII Overseas Services Corporation | | Delaware |
| HII San Diego Shipyard Inc. | | California |
| HII Services Corporation | | Delaware |
| HII ShipCycle, LLC | | Delaware |
| HII Technical Solutions Corporation | | Delaware |
| HII TSD Holding Company | | Delaware |
| HII Unmanned Systems, Inc. | | Delaware |
| Huntington Ingalls Engineering Services, Inc. | | Delaware |
| Huntington Ingalls Incorporated | | Virginia |
| Huntington Ingalls Industries Australia Pty Ltd. | | Australia |
| Huntington Ingalls Industries Energy and Environmental Services, Inc. | | Delaware |
| Huntington Ingalls Industries International Shipbuilding, Inc. | | Nevada |
| Huntington Ingalls Industries Risk Management LLC | | Vermont |
| Huntington Ingalls Unmanned Maritime Systems, Inc. | | Delaware |
| Ingalls Shipbuilding, Inc. | | Delaware |
| Integrated Mission Excellence, LLC | | Delaware |
| Newport News Nuclear, Inc. | | Virginia |
| Newport News Reactor Services, Inc. | | Virginia |
| Newport News Shipbuilding and Dry Dock Company | | Delaware |
| Titan II Inc. | | Delaware |
| Veritas Analytics, Inc. | | Virginia |