| MSMcb Steel, INC. | Bessemer | AL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MIMcdermott INC | Gibson | LA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MIMcdermott INC - Morgan City Fabrication Facility - Amelia Yard | Boeuf | LA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MTMce Technologies INC | Seattle | WA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
 Mclaughlin Body CO | East Moline | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMcneely Steel & Supply | Leavenworth | KS | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MIMetal Industries, INC | Crystal River | FL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MPMetals & Plastics INC | Longwood | FL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMetropolitan Steel I/steelco | Sinking Spring | PA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MMMetso Minerals | Milwaukee | WI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MUMeyer Utility Structures | Clinton | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MAMid America Steel Inc-fargo | Fargo | ND | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MAMiddle Atlantic Products, INC. | Fairfield | NJ | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MIMid-park INC - Mid-park Highway | Leitchfield | KY | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMid States Steel Products CO | Lexington | KY | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMidstate Steel, INC. | Macon | GA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MMMidwest Machine Products INC | Golden | CO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MFMillers Fab & Weld Corporation | Riverside | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MFMillinocket Fabrication & Machine INC | Millinocket | ME | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
 Mills Manufacturing INC | Earlville | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MUMinova USA INC | South Point | OH | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MDMissouri Dry Dock & Repair CO | Cape Girardeau | MO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MVMissouri Valley Steel Company | Sioux City | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MMMk Metal Products Enterprises INC | Mansfield | OH | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MWModern Welding CO of Kentucky INC | Hardin County | KY | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MMModine Mfg CO - Former Site of | Washington | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MWMonarch Ware INC | Algoma | WI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MRMowata Rice Drier INC - Southern Rice Drier & Storage CO | Rayne | LA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MMMulberry Manufacturing CO | Mulberry | FL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MPMulti-craft Plastics | Portland | OR | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMunster Steel Company | Munster | IN | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NCNai Cranes LLC | Woburn | MA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NVNashoba Valley Structural | Lunenburg | MA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NBNci Bldg Sys Inc/ambridge | Ambridge | PA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NUNeoplan USA CORP | Lamar | CO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NMNew Millenium Building Systems | Continental | OH | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NMNew Millennium Building System S INC | Florence | SC | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NLNext Level Metal | Baldwin | IL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NWNiermann Weeks Company, INC | Millersville | MD | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NMNolin Milling INC | Dickens | IA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NMNorthern Metal Fab INC | Baldwin | WI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NGNorthrop Grumman Ship Systems INC | Waggaman | LA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NSNorthshore Steel INC | Two Harbors | MN | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NSNorth State Steel Incorporated | Greenville | NC | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NSNorthwest Steel Fab INC Deer Park | Deer Park | WA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| OFOberlin Filter Company | Pewaukee | WI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| OCObie Construction, INC. | Eugene | OR | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| OIOcci INC. Wwtp | Fulton | MO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| OSOcean Steel CORP | Conklin | NY | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| OFOem Fabricators INC | Neillsville | WI | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
