| MSMartin Steel INC | Huntington | WV | — | ◇ UNVERIFIED |
| MCMaterial Containment INC | Houston | TX | — | ◇ UNVERIFIED |
| MPMaterials Packaging CORP | Oklahoma City | OK | — | ◇ UNVERIFIED |
| MCMauser CORP | Blacklick | OH | — | ◇ UNVERIFIED |
| MUMauser Usa, LLC (formerly Berenfield Containers) | Pine Bluff | AR | — | ◇ UNVERIFIED |
| MWMazzella Welding & Fabrication INC | Wellsburg | WV | — | ◇ UNVERIFIED |
 M-b Companies INC | Chilton | WI | — | ◇ UNVERIFIED |
| MAMcabee Assembly Facility | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| MSMcb Steel, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| MDMcconnell Drum Service INC | Doraville | GA | — | ◇ UNVERIFIED |
| MIMcdermott INC | Gibson | LA | — | ◇ UNVERIFIED |
| MIMcdermott INC - Morgan City Fabrication Facility - Amelia Yard | Amelia | LA | — | ◇ UNVERIFIED |
| MTMce Technologies INC | Seattle | WA | — | ◇ UNVERIFIED |
| MPMckinney Products | Scranton | PA | — | ◇ UNVERIFIED |
 Mclaughlin Body CO | East Moline | IL | — | ◇ UNVERIFIED |
| MSMcneely Steel & Supply | Leavenworth | KS | — | ◇ UNVERIFIED |
| MIMct Industries Inc, Government Manufacturing | Bernalillo | NM | — | ◇ UNVERIFIED |
 Meadow Burke, LLC. | Tampa | FL | — | ◇ UNVERIFIED |
| MVMercer Vault Company | Fredericksburg | VA | — | ◇ UNVERIFIED |
| MOMetalcraft of Mayville | West Bend | WI | — | ◇ UNVERIFIED |
| MIMetal Industries, INC | Crystal River | FL | — | ◇ UNVERIFIED |
| MPMetal Pros | Wichita | KS | — | ◇ UNVERIFIED |
| MSMetal Spinners | Angola | IN | — | ◇ UNVERIFIED |
| MPMetals & Plastics INC | Longwood | FL | — | ◇ UNVERIFIED |
| MCMetromont Corporation | Charlotte | NC | — | ◇ UNVERIFIED |
| MLMetromont LLC - Richmond Plant | Richmond | VA | — | ◇ UNVERIFIED |
| MPMetromont Prestress Company | Charlotte | NC | — | ◇ UNVERIFIED |
| MSMetropolitan Steel I/steelco | Sinking Spring | PA | — | ◇ UNVERIFIED |
| MMMetso Minerals | Milwaukee | WI | — | ◇ UNVERIFIED |
| MFMeyerink Farm Service INC. | Platte | SD | — | ◇ UNVERIFIED |
| MUMeyer Utility Structures | Clinton | IL | — | ◇ UNVERIFIED |
| MHM H Eby INC | Story City | IA | — | ◇ UNVERIFIED |
| MAMid America Steel Inc-fargo | Fargo | ND | — | ◇ UNVERIFIED |
| MAMiddle Atlantic Products, INC. | Fairfield | NJ | — | ◇ UNVERIFIED |
| MHMid Hudson Concrete | Cold Spring | NY | — | ◇ UNVERIFIED |
| MIMid-park INC - Mid-park Highway | Leitchfield | KY | — | ◇ UNVERIFIED |
| MSMid States Steel Products CO | Lexington | KY | — | ◇ UNVERIFIED |
| MSMidstate Steel, INC. | Macon | GA | — | ◇ UNVERIFIED |
| MFMidwest Fabrication, LLC | Grafton | ND | — | ◇ UNVERIFIED |
| MMMidwest Machine Products INC | Golden | CO | — | ◇ UNVERIFIED |
| MIMiller/greeneville INC. | Greeneville | TN | — | ◇ UNVERIFIED |
| MFMillers Fab & Weld Corporation | Riverside | CA | — | ◇ UNVERIFIED |
| MFMillinocket Fabrication & Machine INC | Millinocket | ME | — | ◇ UNVERIFIED |
 Mills Manufacturing INC | Earlville | IA | — | ◇ UNVERIFIED |
| MIMinnick Illinois LLC | Joliet | IL | — | ◇ UNVERIFIED |
| MUMinova USA INC | South Point | OH | — | ◇ UNVERIFIED |
| MMMisener Marine Construction, INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MDMissouri Dry Dock & Repair CO | Cape Girardeau | MO | — | ◇ UNVERIFIED |
| MMMissouri Machine & Plow, LLC. | Cedartown | GA | — | ◇ UNVERIFIED |
| MVMissouri Valley Steel Company | Sioux City | IA | — | ◇ UNVERIFIED |
| MCMitchell Concrete INC. | Mitchell | SD | — | ◇ UNVERIFIED |
| MCMjk Custom Fab and Coatings LLC | Ogden | UT | — | ◇ UNVERIFIED |
| MSMka Spray Service | Lawrence | MA | — | ◇ UNVERIFIED |
| MMMk Metal Products Enterprises INC | Mansfield | OH | — | ◇ UNVERIFIED |
| MWModern Welding CO of Kentucky INC | Hardin County | KY | — | ◇ UNVERIFIED |
| MMModine Mfg CO - Former Site of | Washington | IA | — | ◇ UNVERIFIED |
| MCMolin Concrete Products CO | Lino Lakes | MN | — | ◇ UNVERIFIED |
| MPMonarch Precast Concrete CORP | Allentown | PA | — | ◇ UNVERIFIED |
| MWMonarch Ware INC | Algoma | WI | — | ◇ UNVERIFIED |
| MMonierlifetile | Tacoma | WA | — | ◇ UNVERIFIED |
| MLMonierlifetile L L C | Brookshire | TX | — | ◇ UNVERIFIED |
| MRMowata Rice Drier INC - Southern Rice Drier & Storage CO | Rayne | LA | — | ◇ UNVERIFIED |
| MMMulberry Manufacturing CO | Mulberry | FL | — | ◇ UNVERIFIED |
| MPMulti-craft Plastics | Portland | OR | — | ◇ UNVERIFIED |
| MSMunster Steel Company | Munster | IN | — | ◇ UNVERIFIED |
 Myers Container Corporation | San Pablo | CA | — | ◇ UNVERIFIED |
| Myers Container LLC | City of Industry | CA | — | ◇ UNVERIFIED |
| NCNai Cranes LLC | Woburn | MA | — | ◇ UNVERIFIED |
| NVNashoba Valley Structural | Lunenburg | MA | — | ◇ UNVERIFIED |
| NBNashville Barrel & Drum INC | Fairview | TN | — | ◇ UNVERIFIED |
| NFNatl Fuel Gas Supply/knox Station | Brookville | PA | — | ◇ UNVERIFIED |
| NBNci Bldg Sys Inc/ambridge | Ambridge | PA | — | ◇ UNVERIFIED |
| NVNebraska Vault INC | Columbus | NE | — | ◇ UNVERIFIED |
| NPNekoosa Packaging, Memphis Boxplant | Memphis | TN | — | ◇ UNVERIFIED |
| NUNeoplan USA CORP | Lamar | CO | — | ◇ UNVERIFIED |
| NENettie's Equipment | Duck | WV | — | ◇ UNVERIFIED |
| NMNewhouse Mfg | Redmond | OR | — | ◇ UNVERIFIED |
| NNewlons | Elkins | WV | — | ◇ UNVERIFIED |
| NMNew Millenium Building Systems | Continental | OH | — | ◇ UNVERIFIED |
| NMNew Millennium Building System S INC | Florence | SC | — | ◇ UNVERIFIED |
| NNNewport News Shipbuilding Oakland Industrial Oip | Newport News | VA | — | ◇ UNVERIFIED |
| NLNext Level Metal | Baldwin | IL | — | ◇ UNVERIFIED |
| NLNhmf, LLC | Columbus | OH | — | ◇ UNVERIFIED |
| NWNiermann Weeks Company, INC | Millersville | MD | — | ◇ UNVERIFIED |
| NCNitterhouse Concrete Precast Plt | Chambersburg | PA | — | ◇ UNVERIFIED |
| NMNolin Milling INC | Dickens | IA | — | ◇ UNVERIFIED |
| NANorth Amer Mfg | Scranton | PA | — | ◇ UNVERIFIED |
| NDNorth Dakota State Penitentiary | Bismarck | ND | — | ◇ UNVERIFIED |
| NPNortheast Precast CORP | Millville | NJ | — | ◇ UNVERIFIED |
| NINorthern Il Wilbert Vault CO INC | Belvidere | IL | — | ◇ UNVERIFIED |
| NMNorthern Metal Fab INC | Baldwin | WI | — | ◇ UNVERIFIED |
| NMNorthfield Mundelein Plant | Mundelein | IL | — | ◇ UNVERIFIED |
| NMNorth Marina Ameron Hulbert | Everett | WA | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Ship Systems INC | Waggaman | LA | — | ◇ UNVERIFIED |
| NSNorthshore Steel INC | Two Harbors | MN | — | ◇ UNVERIFIED |
| NSNorth State Steel Incorporated | Greenville | NC | — | ◇ UNVERIFIED |
| NINorthwest Illinois Construction CO | Rock Falls | IL | — | ◇ UNVERIFIED |
| NSNorthwest Steel Fab INC Deer Park | Deer Park | WA | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | Posen | IL | — | ◇ UNVERIFIED |
| NCNorthwind Concrete Products CO | South Beloit | IL | — | ◇ UNVERIFIED |
