| LMLee's Morvillo Group | Providence | RI | Primary Metal Manufacturing331491 | 20-99 | ◐ LIKELY ACTIVE |
Leggett & Platt-wire Mill - Carthage Central Ave | Carthage | MO | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| LSLehigh Specialty Melting INC | Latrobe | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| LILemfco INC | Galena | IL | Primary Metal Manufacturing331511 | 1-19 | ◐ LIKELY ACTIVE |
| LPLeveltek Processing INC | Benwood | WV | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
Lex Products, LLC | Pacoima | CA | Primary Metal Manufacturing331491 | — | ◐ LIKELY ACTIVE |
| LHL & H Manufacturing Company | Mandan | ND | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| LCLiberty Casting CO (0121010003) | Delaware | OH | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| LFLiberty Forge | Liberty | TX | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| LILinacast Incorporated Linamar Light Metals Pierceton | Pierceton | IN | Primary Metal Manufacturing331521 | — | ◐ LIKELY ACTIVE |
| LFLincoln Foundry Inc/erie | Erie | PA | Primary Metal Manufacturing331492 | — | ◐ LIKELY ACTIVE |
| LPLinn Products INC | Charlotte | MI | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| LFLittle Falls Alloys, INC. | Paterson | NJ | Primary Metal Manufacturing331420 | — | ◐ LIKELY ACTIVE |
| LIL&n Industries INC | Rushville | IL | Primary Metal Manufacturing331110 | 1-19 | ◐ LIKELY ACTIVE |
| LGLuxfer Gas Cylinders | Riverside | CA | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| MEMadison Electric Company | Fraser | MI | Primary Metal Manufacturing331319 | — | ◐ LIKELY ACTIVE |
| MCMadison-kipp Corporation - Sun Prairie | Sun Prairie | WI | Primary Metal Manufacturing331523 | 100-499 | ◐ LIKELY ACTIVE |
| M7Magnitude 7 Metals LLC | Marston | MO | Primary Metal Manufacturing331312 | — | ◐ LIKELY ACTIVE |
| MDMagnus Division of Lv Ventures | Fremont | NE | Primary Metal Manufacturing331525 | — | ◐ LIKELY ACTIVE |
| MIMagotteaux INC | Pulaski | TN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MIMaico Industries INC | Ellsworth | KS | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| MMMajor Metals Company | Mansfield | OH | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| MMancor | Dayton | OH | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
| MIMansfield Industries INC | Mansfield | OH | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| MMMarksman Metals CO INC | Saint Michael | MN | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| MSMartin Sprocket & Gear INC | Dallas | TX | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| MOMaruichi Oregon Steel Tube | Portland | OR | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| MUMatalco Usa, LLC | Lordstown | OH | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| MAMaterion Advanced Materials Techologies & Services INC | Niagara Falls | NY | Primary Metal Manufacturing331491 | — | ◐ LIKELY ACTIVE |
| MBMaterion Brush INC | Shoemakersville | PA | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| MTMaverick Tube LP Blythev L | Blytheville | AR | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MDMcwane Ductile | Provo | UT | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| MCMesser Cutting Systems INC | Menomonee Falls | WI | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
| MIMetalsamerica INC | Shelby | NC | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| MSMetal Source, LLC (GHR07) | Huntington | IN | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| MVM&h Valve Company, a Division of Mcwane, LLC | Anniston | AL | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MBMiba Bearings US LLC | Mc Connelsville | OH | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| MFMid-City Foundry Co. - Milwaukee Division | Milwaukee | WI | Primary Metal Manufacturing331510 | 20-99 | ◐ LIKELY ACTIVE |
| MFMid-city Foundry CORP - United Div | Grafton | WI | Primary Metal Manufacturing331510 | 20-99 | ◐ LIKELY ACTIVE |
| MTMid-ohio Tubing, LLC | Decatur | AL | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| MWMid-south Wire Company | Nashville | TN | Primary Metal Manufacturing331222 | 100-499 | ◐ LIKELY ACTIVE |
| MFMilwaukee Forgetech INC. | Milwaukee | WI | Primary Metal Manufacturing331111 | — | ◐ LIKELY ACTIVE |
| MIMinncast INC | Fridley | MN | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| MMMinster Machine CO | Minster | OH | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MSMississippi Silicon | Burnsville | MS | Primary Metal Manufacturing331314 | 100-499 | ◐ LIKELY ACTIVE |
| MSMissouri Smelting Technology INC | Jackson | TN | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| MMMm Metals USA LLC | Fairless Hills | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| MSModern Sheet Metal Works, INC. | Miamitown | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| MWMotor Wheel Commercial Vehicle Systems INC | Chattanooga | TN | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MWMotor Wheel LLC | Franklin | KY | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |