| | | | | | | | | | | | | | |
| Name of Subsidiary | | Jurisdiction of Organization | | Ownership Percentage |
| Avondale Engineering & Construction Company | | Delaware | | 100% |
| CEMC Enterprise, LLC | | Delaware | | 100% |
| Commonwealth Technology Innovation LLC | | Virginia | | 100% |
| Enlighten IT Consulting LLC | | Maryland | | 100% |
| Fleet Services Holding Corp. | | Delaware | | 100% |
| Gray Research, Inc. | | Alabama | | 100% |
| H&B Defence Pty Ltd | | Australia | | 100% |
| HII (Australia) Holding Company Pty Ltd | | Australia | | 100% |
| HII Energy Inc. | | Virginia | | 100% |
| HII Fleet Support Group LLC | | Delaware | | 100% |
| HII Mission Technologies Corp. | | Delaware | | 100% |
| HII Nuclear Inc. | | Delaware | | 100% |
| HII Nuclear Canada, Inc. | | Canada | | 100% |
| HII San Diego Shipyard Inc. | | California | | 100% |
| HII Services Corporation | | Delaware | | 100% |
| HII Technical Solutions Corporation | | Delaware | | 100% |
| HII Technical Solutions Limited | | United Kingdom | | 100% |
| HII TSD Holding Company | | Delaware | | 100% |
| HII (US) International Holding Company | | Delaware | | 100% |
| HII (UK) International Holding Company Ltd. | | United Kingdom | | 100% |
| HII Unmanned Systems, Inc. | | Delaware | | 100% |
| Huntington Ingalls Engineering Services, Inc. | | Delaware | | 100% |
| Huntington Ingalls Incorporated | | Virginia | | 100% |
| Huntington Ingalls Industries Australia PTY Ltd. | | Australia | | 100% |
| Huntington Ingalls Industries Energy and Environmental Services, Inc. | | Delaware | | 100% |
| Huntington Ingalls Industries International Shipbuilding, Inc. | | Nevada | | 100% |
| Huntington Ingalls Industries Risk Management LLC | | Vermont | | 100% |
| Huntington Ingalls Unmanned Maritime Systems, Inc. | | Delaware | | 100% |
| Idaho Cleanup Completion Partners, LLC | | Delaware | | 61% |
| Ingalls Shipbuilding, Inc. | | Delaware | | 100% |
| Integrated Mission Excellence, LLC | | Delaware | | 100% |
| KHA Defense Solutions PTY LTD | | Australia | | 50% |
| National Tru Solutions LLC | | Delaware | | 75% |
| Nationwide Remediation Partners, LLC | | Delaware | | 51% |
| Newport News Nuclear BWXT-Los Alamos, LLC | | Delaware | | 51% |
| Newport News Nuclear, Inc. | | Virginia | | 100% |
| Newport News Reactor Services, Inc. | | Virginia | | 100% |
| Newport News Shipbuilding and Dry Dock Company | | Delaware | | 100% |
| Pantex Production Partners LLC | | Delaware | | 100% |
| Pegasus International Holdings, Inc. | | Texas | | 100% |
| Pegasus International Services, Inc. | | Nevada | | 100% |