| LSLakeside Steel Alabama - Thomasville Finishing Works | Thomasville | AL | — | ◇ UNVERIFIED |
| LTLakeside Tech Solutions LLC | Monroe City | MO | — | ◇ UNVERIFIED |
| LMLane Metal Prods Mfg | Bedford | PA | — | ◇ UNVERIFIED |
| LSLapham-hickey Steel Corporation | Oshkosh | WI | — | ◇ UNVERIFIED |
| LFLayman Fabrication Incorporated | North Vernon | IN | — | ◇ UNVERIFIED |
| LBL & B Products CORP | Hudson | NY | — | ◇ UNVERIFIED |
| LILeaf Industries/division of J&e Manufacturing CO | Plymouth | MN | — | ◇ UNVERIFIED |
| LMLegris Mfg. CO INC | Kankakee | IL | — | ◇ UNVERIFIED |
| LMLeman Machine CO INC | Portage | PA | — | ◇ UNVERIFIED |
| LSLenex Steel | Indianapolis | IN | — | ◇ UNVERIFIED |
| LALennox Aes-reno | Reno | NV | — | ◇ UNVERIFIED |
| LALennox Aes-tallassee | Tallassee | AL | — | ◇ UNVERIFIED |
| LTLetourneau Technologies, INC | Vicksburg | MS | — | ◇ UNVERIFIED |
| LFLevco Fab INC | Ontario | CA | — | ◇ UNVERIFIED |
| LBLiebovich Brothers INC | Rockford | IL | — | ◇ UNVERIFIED |
| LMLightning Metal Specialty | Elk Grove Village | IL | — | ◇ UNVERIFIED |
| LLightolier | Wilmington | MA | — | ◇ UNVERIFIED |
| LMLincoln Manufacturing North Plant | Magnolia | TX | — | ◇ UNVERIFIED |
| LSLincoln Steel Corporation | Lincoln | NE | — | ◇ UNVERIFIED |
 Lippert Components, INC | Goshen | IN | — | ◇ UNVERIFIED |
| Lippert Components INC. 83 | Elkhart | IN | — | ◇ UNVERIFIED |
| Lippert Components Manufacturing, INC. | White Pigeon | MI | — | ◇ UNVERIFIED |
| Lippert Components Plant 084 | Nampa | ID | — | ◇ UNVERIFIED |
| Lippert Components Plant 151 | Kendallville | IN | — | ◇ UNVERIFIED |
| LILisega INC. | Newport | TN | — | ◇ UNVERIFIED |
| LWLittle Washington Fabrications, INC. | Christiana | PA | — | ◇ UNVERIFIED |
| LMLmi Manufacturing Holdings LLC | Allenton | WI | — | ◇ UNVERIFIED |
| LIL&n Industries INC | Rushville | IL | — | ◇ UNVERIFIED |
| LELobdell Emery Mfg CO | Alma | MI | — | ◇ UNVERIFIED |
| LMLockheed Martin | Akron | OH | — | ◇ UNVERIFIED |
| LALoral Aeronutronic | Newport Beach | CA | — | ◇ UNVERIFIED |
| LCLoren Cook Co-barnes St Plant | Springfield | MO | — | ◇ UNVERIFIED |
| LPLoren Products | Lawrence | MA | — | ◇ UNVERIFIED |
| LMLoughberry Manufacturing Corporation | Saratoga Springs | NY | — | ◇ UNVERIFIED |
| LTLouisville Tin & Stove | Louisville | KY | — | ◇ UNVERIFIED |
| LRLtc Roll & Engineering | Fraser | MI | — | ◇ UNVERIFIED |
| MDMac Donald Miller Facility Solutions | Seattle | WA | — | ◇ UNVERIFIED |
| MEMac Equipment INC | Sabetha | KS | — | ◇ UNVERIFIED |
| MMMachined Metals Mfg INC | Collegeville | PA | — | ◇ UNVERIFIED |
| MLMachine Laboratory LLC | Chesterfield | MO | — | ◇ UNVERIFIED |
| MHMack Hils, INC. | Moberly | MO | — | ◇ UNVERIFIED |
| MIMadison INC / 8500 New Sapulpa Rd | Tulsa | OK | — | ◇ UNVERIFIED |
| MIMadison Industries | Los Angeles | CA | — | ◇ UNVERIFIED |
| MPMagga Products Company INC | Holly Hill | FL | — | ◇ UNVERIFIED |
| MMMagnuson Metals Utah, LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MPMajestic Products Company | Huntington | IN | — | ◇ UNVERIFIED |
| MSManitex Sabre INC | Knox | IN | — | ◇ UNVERIFIED |
| MMMann Made Products | Waterville | KS | — | ◇ UNVERIFIED |
| MTMapp Technologies, L.l.c. | Joplin | MO | — | ◇ UNVERIFIED |
| MPMarch Performance INC | Naples | FL | — | ◇ UNVERIFIED |
