Kustom Signals, Inc. - Lenexa | Lenexa | KS | 20–99 | ◐ LIKELY ACTIVE |
| LL3Harris | Fort Wayne | IN | 500+ | ◐ LIKELY ACTIVE |
| LL3Harris | Clifton | NJ | 500+ | ◐ LIKELY ACTIVE |
| LEL3Harris EDO Western Corporation | South Salt Lake | UT | 100–499 | ◐ LIKELY ACTIVE |
| LTL3Harris Technologies, Inc | Ashaway | RI | 20–99 | ◐ LIKELY ACTIVE |
| LTL3Harris Technologies Maripro Inc. | Goleta | CA | 100–499 | ◐ LIKELY ACTIVE |
| LTL3 Technologies, INC. | Northampton | MA | — | ◐ LIKELY ACTIVE |
| LTL3 Technologies, INC. | Londonderry | NH | — | ◐ LIKELY ACTIVE |
| LLakeMaster | Little Falls | MN | 20–99 | ◐ LIKELY ACTIVE |
| LVLas Vegas, USA | Las Vegas | NV | 1–19 | ◐ LIKELY ACTIVE |
| LTLaurel Technologies Partnership | Eagan | MN | — | ◐ LIKELY ACTIVE |
| LSLeidos Security Detection & Automation, INC. | Saint Petersburg | FL | — | ◐ LIKELY ACTIVE |
| LTLemnos Technologies, LLC | Woodbridge | CA | — | ◐ LIKELY ACTIVE |
| LULenexa, USA | Lenexa | KS | 20–99 | ◐ LIKELY ACTIVE |
| LDLeonardo DRS - Burnsville Facility | Burnsville | MN | 20–99 | ◐ LIKELY ACTIVE |
| LDLeonardo DRS - Johnstown Facility | Johnstown | PA | 100–499 | ◐ LIKELY ACTIVE |
| LDLeonardo DRS - Largo Facility | Largo | FL | 100–499 | ◐ LIKELY ACTIVE |
| LDLeonardo DRS - Sidman Facility | Sidman | PA | 20–99 | ◐ LIKELY ACTIVE |
| LELingle Engineering, INC. | Thousand Oaks | CA | — | ◐ LIKELY ACTIVE |
| LCLittleton CO - Continental | Littleton | CO | 20–99 | ◐ LIKELY ACTIVE |
| LCLittleton CO - Shaffer | Littleton | CO | 20–99 | ◐ LIKELY ACTIVE |
| LALivelink Aerospace INC | Saint George | UT | — | ◐ LIKELY ACTIVE |
| LALkd Aerospace, LLC | Snoqualmie | WA | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation | Virginia Beach | VA | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Camden Campus (5189) | Camden | NJ | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Gilbert AZ (1390) | Gilbert | AZ | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Killeen Campus (1420) | Killeen | TX | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Pascagoula Campus (1212) | Pascagoula | MS | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Santa Barbara CA (1384) | Goleta | CA | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US AK Anderson Clear AFS (5433) | Anderson | AK | 1–19 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US CA San Diego Woden St (1235) | San Diego | CA | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US GA Warner Robins WWLD (1400) | Warner Robins AFB | GA | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US MA Marion Front St (2448) | Marion | MA | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US ME Bath SUPSHIP Washgtn St (1198) | Bath | ME | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NJ Moorestown Bortn Lndg Rd (1015) | Moorestown | NJ | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NJ Moorestown Centrtn 300 (5201) | Moorestown | NJ | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NJ Mount Laurel Tech Campus (1450) | Moorestown | NJ | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NY Niagara Falls Blvd (1951) | Niagara Falls | NY | 20–99 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NY Owego State Route 17C (1233) | Owego | NY | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US NY Syracuse Electroncs Pkwy (1021) | Liverpool | NY | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Sippican, INC. | Manassas | VA | — | ◐ LIKELY ACTIVE |
| LPLoc Performance Products LLC | Lansing | MI | — | ◐ LIKELY ACTIVE |
| LPLoc Performance Products LLC | Plymouth | MI | — | ◐ LIKELY ACTIVE |
| LLongmont | Longmont | CO | 20–99 | ◐ LIKELY ACTIVE |
| MMa | Concord | MA | 1–19 | ◐ LIKELY ACTIVE |
| MFMA, Fall River - 275 Martine St. (IMS-M) | Fall River | MA | 20–99 | ◐ LIKELY ACTIVE |
| MMMarlborough MA | Marlborough | MA | 20–99 | ◐ LIKELY ACTIVE |
| MCMarotta Controls (Chaska) | Chaska | MN | 20–99 | ◐ LIKELY ACTIVE |
| MPMarotta Parsippany | Parsippany | NJ | 100–499 | ◐ LIKELY ACTIVE |
| MIMassa Industries, INC | Hingham | MA | — | ◐ LIKELY ACTIVE |