| LPLindsay Precast, Inc. | Alachua | FL | 20–99 | ◐ LIKELY ACTIVE |
| LRLittle Rock Wilbert Burial Vault | Decatur | IL | 1–19 | ◐ LIKELY ACTIVE |
| LMLM Manufacturing | Detroit | MI | 100–499 | ◐ LIKELY ACTIVE |
Locke Solutions LLC DFW | Alvarado | TX | 20–99 | ◐ LIKELY ACTIVE |
Locke Solutions LLC Formosa | Point Comfort | TX | 1–19 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation | Suffolk | VA | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation FL-Crestview-Eglin AFB (5172) | Crestview | FL | 20–99 | ◐ 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 US AL Troy Airport Blvd (5209) | Troy | AL | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US CT Bridgeport South Ave (5220) | Bridgeport | CT | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US CT Stratford Main St (5225) | Stratford | CT | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US CT Trumbull (5227) | Trumbull | CT | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US CT Trumbull Quarry Rd 124 (5228) | Trumbull | CT | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US FL Jupiter Beeline Hwy DFC (5295) | Jupiter | FL | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US GA Marietta S Cobb Dr (1169) | Marietta | GA | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US TX Dallas 1727 S Main St (5267) | Dallas | TX | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US TX Fort Worth Lockheed Blvd (1093) | Fort Worth | TX | 500+ | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation US WI Milwaukee Tower Ave (5283) | Milwaukee | WI | 100–499 | ◐ LIKELY ACTIVE |
| LMLockheed Martin Corporation Valley Forge (1029) | King of Prussia | PA | 500+ | ◐ LIKELY ACTIVE |
| LLockport | Lockport | NY | 20–99 | ◐ LIKELY ACTIVE |
| LPLonestar Prestress Mfg., Inc. | Bellville | TX | 20–99 | ◐ LIKELY ACTIVE |
| LALos Alamitos | Los Alamitos | CA | 20–99 | ◐ LIKELY ACTIVE |
| LILPI Industries | Hollywood | FL | 20–99 | ◐ LIKELY ACTIVE |
| LWL Woodard - Isr - Defense Consulting, INC | Caddo Mills | TX | — | ◐ LIKELY ACTIVE |
| LLLyonsedge Logistics L.l.c. | Newport News | VA | — | ◐ LIKELY ACTIVE |
Mack Industries of Bowling Green | Bowling Green | OH | 20–99 | ◐ LIKELY ACTIVE |
Mack Industries of Michigan | White Lake | MI | 20–99 | ◐ LIKELY ACTIVE |
Mack Industries of Mount Vernon | Mount Vernon | OH | 20–99 | ◐ LIKELY ACTIVE |
Mack Industries of North Carolina | Rocky Mount | NC | 20–99 | ◐ LIKELY ACTIVE |
Mack Industries of PA | Vienna | OH | 20–99 | ◐ LIKELY ACTIVE |
| MEMaddog Enterprises INC. | Klamath Falls | OR | — | ◐ LIKELY ACTIVE |
| MQMAF Quikrete | Midland | TX | 20–99 | ◐ LIKELY ACTIVE |
| MLMagna LVSS | Shepherdsville | KY | 500+ | ◐ LIKELY ACTIVE |
| MSMagna Seating Auburn Hills - Brown Road | Auburn Hills | MI | 20–99 | ◐ LIKELY ACTIVE |
| MSMagna Seating Columbus | Lancaster | OH | 500+ | ◐ LIKELY ACTIVE |
| MSMagna Seating Detroit | Highland Park | MI | 500+ | ◐ LIKELY ACTIVE |
| MSMagna Seating Detroit South | Highland Park | MI | 100–499 | ◐ LIKELY ACTIVE |
| MOMain Office | Vesta | MN | 20–99 | ◐ LIKELY ACTIVE |
| MPMain Plant | Cullman | AL | 20–99 | ◐ LIKELY ACTIVE |
| MPMammoth Precast Solutions, INC. | Omaha | NE | — | ◐ LIKELY ACTIVE |
| MSManchester / Smyrna | Manchester | TN | 500+ | ◐ LIKELY ACTIVE |
| MTMantapoole Technologies LLC | Chesterfield | VA | — | ◐ LIKELY ACTIVE |
| MNMarelli North America, Inc. | Bowling Green | OH | 20–99 | ◐ LIKELY ACTIVE |
| MIMarkham INC | N. Chesterfield | VA | 20–99 | ◐ LIKELY ACTIVE |
| MUMarshall USA LLC | Greensboro | NC | — | ◐ LIKELY ACTIVE |
| MLMarshfield Location | Marshfield | MA | 20–99 | ◐ LIKELY ACTIVE |
| MHMaryland Heights, MO (MO008) | Maryland Heights | MO | 20–99 | ◐ LIKELY ACTIVE |
| MIMascoutah, IL (IL013) | Mascoutah | IL | 100–499 | ◐ LIKELY ACTIVE |
| MMMasons Mark Youngwood, PA | Youngwood | PA | 1–19 | ◐ LIKELY ACTIVE |