| KCKriparos Cynthia | Chesapeake | VA | — | ◐ LIKELY ACTIVE |
| KEKsm Electronics, INC. | Warrenville | IL | — | ◐ LIKELY ACTIVE |
| KMKwk Manufacturing LLC | Winfield | KS | — | ◐ LIKELY ACTIVE |
| LL3Harris | Salt Lake City | UT | 500+ | ◐ LIKELY ACTIVE |
| L1L3Harris - 1200 Woody Burke Rd. Melbourne, FL | Melbourne | FL | 20–99 | ◐ LIKELY ACTIVE |
| LAL3Harris AS IAS Waco | Waco | TX | 500+ | ◐ LIKELY ACTIVE |
| LBL3Harris BCS Carlsbad | Carlsbad | CA | 100–499 | ◐ LIKELY ACTIVE |
| LTL3Harris Technologies, Integrated Systems L.P. (Andrews AFB) | Andrews AFB | MD | 20–99 | ◐ LIKELY ACTIVE |
| LTL3Harris Technologies, Integrated Systems L.P. (Greenville) | Greenville | TX | 500+ | ◐ LIKELY ACTIVE |
| LTL3 Technologies, INC. | Camden | NJ | — | ◐ LIKELY ACTIVE |
| LTL3 Technologies, INC. | Camden | NJ | — | ◐ LIKELY ACTIVE |
| LTL3 Technologies Telemetry & RF Products | San Diego | CA | 100–499 | ◐ LIKELY ACTIVE |
| LILamb Industries LLC | Rome | GA | — | ◐ LIKELY ACTIVE |
| LSLandguard Systems, INC | Clearwater | FL | — | ◐ LIKELY ACTIVE |
| LAL and R Technologies LLC | Virginia Beach | VA | — | ◐ LIKELY ACTIVE |
| LLLeading Lady D Logistics LLC | Greenwood | SC | — | ◐ LIKELY ACTIVE |
| LILeadowski INC | Brooklyn | NY | — | ◐ LIKELY ACTIVE |
| LMLEAP Minneapolis | Minneapolis | MN | 1–19 | ◐ LIKELY ACTIVE |
| LCLegacy Communications, L.l.c. | Grand Island | NE | — | ◐ LIKELY ACTIVE |
| LLegrand | Reno | NV | 100–499 | ◐ LIKELY ACTIVE |
| LILegrand - Independence - OH | Independence | OH | 20–99 | ◐ LIKELY ACTIVE |
| LFLemont Furnace, PA (PA055) | Lemont Furnace | PA | 20–99 | ◐ LIKELY ACTIVE |
| LELeonardo Electronics US - Tucson | Tucson | AZ | 100–499 | ◐ LIKELY ACTIVE |
| LHLeonardo Helicopters Usa, INC. | Alexandria | VA | — | ◐ LIKELY ACTIVE |
| LLLetova LLC | Brooklyn | NY | — | ◐ LIKELY ACTIVE |
| LCLevantis CORP | Conyers | GA | — | ◐ LIKELY ACTIVE |
| LTLewisville TX | Lewisville | TX | 100–499 | ◐ LIKELY ACTIVE |
| LPLexington Park, MD (02T) | Lexington Park | MD | 20–99 | ◐ LIKELY ACTIVE |
| LPLex Products - CA | Pacoima | CA | 1–19 | ◐ LIKELY ACTIVE |
| LPLex Products Davie FL | Davie | FL | 20–99 | ◐ LIKELY ACTIVE |
| LTLighthorse Technologies, INC. | San Diego | CA | — | ◐ LIKELY ACTIVE |
| LALightspeed Aviation INC | Lake Oswego | OR | — | ◐ LIKELY ACTIVE |
| LILincdyne INC. | Towson | MD | — | ◐ LIKELY ACTIVE |
| LTLindsey Technical Solutions LLC | Bradenton | FL | — | ◐ LIKELY ACTIVE |
| LPLinear Photonics LLC | Hamilton | NJ | — | ◐ LIKELY ACTIVE |
| LLisle | Lisle | IL | 1–19 | ◐ LIKELY ACTIVE |
| LCLite Coms LLC | Fairport | NY | — | ◐ LIKELY ACTIVE |
| LILittelfuse, INC. | Rosemont | IL | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation | Suffolk | VA | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Chelmsford (1553) | Chelmsford | MA | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Courtland Facility (1595) | Courtland | AL | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation FL-Crestview-Eglin AFB (5172) | Crestview | FL | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Grand Prairie Campus (1435) | Grand Prairie | TX | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation HOUSTON-2100 SPACE PARK DRIVE (3537) | Houston | TX | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Kennedy Space Campus (1337) | Kennedy Space Center | FL | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Kings Bay Campus (1559) | Kings Bay | GA | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Lexington KY-Briar Hill Rd (3812) | Lexington | KY | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation LM Aircraft Logistics Center (1524) | Greenville | SC | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Lufkin (1551) | Lufkin | TX | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Michoud Assembly Facility (1336) | New Orleans | LA | 100–499 | ◐ LIKELY ACTIVE |