| NORTHROP GRUMMAN SPACE & MISSION SYSTEMS CORP.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 8, 1940 | Inactive |
| NORTHROP GRUMMAN PUBLIC SAFETY, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 13, 1970 | Inactive |
| NORTHROP GRUMMAN INFORMATION TECHNOLOGY, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Oct 31, 1978 | Inactive |
| NORTHROP GRUMMAN ADVANCED INFORMATION SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Oct 6, 2000 | Inactive |
| NORTHROP GRUMMAN SHIP SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | May 24, 2002 | Inactive |
| LANDAIR MAPPING, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Aug 28, 2003 | Inactive |
| NORTHROP GRUMMAN COMMERCIAL SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 23, 2004 | Inactive |
| NORTHROP GRUMMAN FEDERAL CIVIL SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Apr 6, 2004 | Inactive |
| NORTHROP GRUMMAN DEFENSE MISSION SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Nov 16, 2004 | Inactive |
| NORTHROP GRUMMAN ENTERPRISE MANAGEMENT SERVICES CORP.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Dec 5, 2005 | Inactive |
| ESSEX CORPORATIONLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 20, 2006 | Inactive |
| 3001, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jan 26, 1995 | Inactive |
| NORTHROP GRUMMAN ELECTRONICS SYSTEMS INTEGRATION INTERNATIONAL, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 9, 1996 | Inactive |
| NORTHROP GRUMMAN COMPUTING SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Dec 5, 1996 | Inactive |
| XONTECH, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 14, 1997 | Inactive |
| LITTON ENTERPRISE SOLUTIONS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Feb 5, 1998 | Inactive |
| NORTHROP GRUMMAN PRB SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | May 26, 1998 | Inactive |
| AMHERST SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Mar 18, 1999 | Inactive |
| PRC ENGINEERING SYSTEMS, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | May 21, 1986 | Inactive |
| TRW SYSTEMS SERVICES COMPANYLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Aug 29, 1989 | Inactive |
| VINNELL CORPORATION OF DELAWARELocation not reported, FL · Inactive | Location not reported, FL | Corporation | Dec 29, 1989 | Inactive |
| INTEGIC CORPORATIONLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Feb 8, 1990 | Inactive |