| NCNorthrop Corporation | Pico Rivera | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Aerospace Systems | Manhattan Beach | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Air Force Plant 42 Site 8 | Palmdale | — | ◇ UNVERIFIED |
| NGNorthrop Grumman CORP. Aircraft Div | El Segundo | — | ◇ UNVERIFIED |
| NGNorthrop Grumman, Palmdale B500 | Palmdale | — | ◇ UNVERIFIED |
| OTOmni Team INC | Downey | — | ◇ UNVERIFIED |
| PPPacific Piston Ring CO INC | Culver City | — | ◇ UNVERIFIED |
| PMParamount Manufacturing CO 445 | Long Beach | — | ◇ UNVERIFIED |
| PDPerez Disposal CO INC | Granada Hills | — | ◇ UNVERIFIED |
| PEPerformance Engines | La Verne | — | ◇ UNVERIFIED |
| PWPrime Wheel | Carson | — | ◇ UNVERIFIED |
| PIProterra INC | City of Industry | — | ◇ UNVERIFIED |
| RRR&d Racing Products USA INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| RHRobinson Helicopter Company, INC. | Torrance | — | ◇ UNVERIFIED |
| RRRoss Racing Pistons INC | El Segundo | — | ◇ UNVERIFIED |
| RARyder Aviall INC | Burbank | — | ◇ UNVERIFIED |
| SFSargent Fletcher INC | El Monte | — | ◇ UNVERIFIED |
| SMSouthwest Marine INC | Terminal Island | — | ◇ UNVERIFIED |
| SESpace Exploration Technologies | Hawthorne | — | ◇ UNVERIFIED |
| SLSpace Lok Incorporated | Gardena | — | ◇ UNVERIFIED |
| SISunvair INC | Valencia | — | ◇ UNVERIFIED |
| TBThe Boeing Company | El Segundo | — | ◇ UNVERIFIED |
| TBThe Boeing Company | Downey | — | ◇ UNVERIFIED |
| TBThe Boeing CO North Airport Facility | Long Beach | — | ◇ UNVERIFIED |
| TMThe Marquardt Company | Van Nuys | — | ◇ UNVERIFIED |
| TATriumph Aerostructures (k6 Facility) | Torrance | — | ◇ UNVERIFIED |
| TSTriumph Structures - Los Angeles | City of Industry | — | ◇ UNVERIFIED |
| TTT & T Precision Machining INC | South Gate | — | ◇ UNVERIFIED |
| TETurbine Engine Components Technology INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| UAUnical Aviation INC | City of Industry | — | ◇ UNVERIFIED |
| USUnited States Sea Launch Limited Partner | Long Beach | — | ◇ UNVERIFIED |
| UDU.s. Doe Energy Technology Engineering Center (etec) | Simi Valley | — | ◇ UNVERIFIED |
| USU S Radiator Corporation | Los Angeles | — | ◇ UNVERIFIED |
| UTUtility Trailer Manufacturing | City of Industry | — | ◇ UNVERIFIED |
| VSValence Surface Technologies Dba Coast Plating | Gardena | — | ◇ UNVERIFIED |
| WDWeber Drilling CO INC | Inglewood | — | ◇ UNVERIFIED |
| WSWeldco Sales INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| ARAerojet Rocketdyne CA Canoga Park 8900 DeSoto Ave ARSPPS | Canoga Park | 500+ | ◐ LIKELY ACTIVE |
| ATAeronautical Technology INC | Long Beach | — | ◐ LIKELY ACTIVE |
| AIAeropulse INC | San Pedro | — | ◐ LIKELY ACTIVE |
| AIAeroworx, INC. | Torrance | — | ◐ LIKELY ACTIVE |
| AFA F B Systems, INC. | Chatsworth | — | ◐ LIKELY ACTIVE |
| APAirmark Plastics CORP | Azusa | — | ◐ LIKELY ACTIVE |
| ASApplied Solutions Group ASG ANCRA Azusa | Azusa | 100–499 | ◐ LIKELY ACTIVE |
| AIAra, INC | San Dimas | — | ▲ REPORTED CLOSED |
| AFAvem Fmi Topco LLC | Valencia | — | ◐ LIKELY ACTIVE |
| ACAviation Certified Products, INC. | Santa Clarita | — | ◐ LIKELY ACTIVE |
| BBixby | Lakewood | 100–499 | ◐ LIKELY ACTIVE |
| CSCaladan Systems INC | Porter Ranch | — | ◐ LIKELY ACTIVE |
| CHChatsworth Hub | Chatsworth | 20–99 | ◐ LIKELY ACTIVE |
