| MWMarks Welding & Fabricating | Thorsby | AL | — | ◇ UNVERIFIED |
| MWMartin Welding and Fabrication LLC | Contoocook | NH | — | ◇ UNVERIFIED |
| MCMauser Container Services | Blacklick | OH | — | ◇ UNVERIFIED |
| MHMckee Holdings LLC | Sandy | OR | — | ◇ UNVERIFIED |
| MEMerrill Engineering & Integration | Saginaw | MI | — | ◇ UNVERIFIED |
| MIMerrill Iron & Steel South | Springfield | MO | — | ◇ UNVERIFIED |
| MMMesser Machine - Mfg INC | Windom | MN | — | ◇ UNVERIFIED |
| MLMetalCraft LLC | Bantam | CT | — | ◇ UNVERIFIED |
| MTMetal Tech, INC. | Fargo | ND | — | ◇ UNVERIFIED |
| MWMetal Works INC. | Spencer | IA | — | ◇ UNVERIFIED |
| MMMexia Main, East, and West Plants | Mexia | TX | — | ◇ UNVERIFIED |
 Mgt Manufacturing LLC | Springville | AL | — | ◇ UNVERIFIED |
| Mgt Manufacturing LLC | Springville | AL | — | ◇ UNVERIFIED |
| MDMi Dept/natural Resources and Environment | River Rouge | MI | — | ◇ UNVERIFIED |
| MSMid South Industrial INC. | Gregory | TX | — | ◇ UNVERIFIED |
| MMMid-state Machine & Fabricating Corporation | Lakeland | FL | — | ◇ UNVERIFIED |
| MMMid-states Mechanical Services INC | Mankato | MN | — | ◇ UNVERIFIED |
| MAMidwest Automation, INC. | Heavener | OK | — | ◇ UNVERIFIED |
| MMMidwest Manufacturing Corporation | Omaha | NE | — | ◇ UNVERIFIED |
| MSMiguel's Sheet Metal | Los Angeles | CA | — | ◇ UNVERIFIED |
 Miller Welding & Machine CO | Brookville | PA | — | ◇ UNVERIFIED |
| MMMill Man Steel INC | Fontana | CA | — | ◇ UNVERIFIED |
| MMMinnesota Metalworks INC | Perham | MN | — | ◇ UNVERIFIED |
| MMMinnotte Manufacturing Corporation | Trafford | PA | — | ◇ UNVERIFIED |
| MWMk Welding & Fabrication, INC. | Waynesville | OH | — | ◇ UNVERIFIED |
| MWModern Welding Company (0145020338) | Newark | OH | — | ◇ UNVERIFIED |
| MWModern Welding CO of Kentucky INC | War Creek | KY | — | ◇ UNVERIFIED |
| MMModine Mfg/laporte/pemberville | La Porte | IN | — | ◇ UNVERIFIED |
| MMMontgomery Metal Craft INC | Springfield | MO | — | ◇ UNVERIFIED |
| MFMoore Flame Cutting Company | Bloomfield Hills | MI | — | ◇ UNVERIFIED |
| MFMoore's Fiberglass, INC. | Walstonburg | NC | — | ◇ UNVERIFIED |
| MMMoorhead Machinery - Boiler CO | Minneapolis | MN | — | ◇ UNVERIFIED |
| MCMurphy Consolidated Industries INC | Follansbee | WV | — | ◇ UNVERIFIED |
| MDMyers Di Corporation | Barnegat | NJ | — | ◇ UNVERIFIED |
| NPNapa Pipe CORP | Napa | CA | — | ◇ UNVERIFIED |
| NFNash Fabricators INC | Vista | CA | — | ◇ UNVERIFIED |
| NBNational Butane Gas Company, INC. | Memphis | TN | — | ◇ UNVERIFIED |
| NONational Oilwell Varco | San Angelo | TX | — | ◇ UNVERIFIED |
| NWNational Welding Corporation | Midvale | UT | — | ◇ UNVERIFIED |
| NGNci Group INC. | Marietta | GA | — | ◇ UNVERIFIED |
| NHNeil H. Daniels, INC. | Ascutney | VT | — | ◇ UNVERIFIED |
| NINeufeldt Industrial Services INC Dba Neufab | Red Wing | MN | — | ◇ UNVERIFIED |
| NTNewberry Tanks and Equipment, LLC | Memphis | TN | — | ◇ UNVERIFIED |
| NINewfield Industries INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| NCNooter Corp-nooter CORP | Saint Louis | MO | — | ◇ UNVERIFIED |
| NANorth American Construction Services, LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| NANorth American Construction Services, LTD. | Birmingham | AL | — | ◇ UNVERIFIED |
| NMNorthstar Metalworks, INC | Brainerd | MN | — | ◇ UNVERIFIED |
| NSNorthstar Steel Fab. INC | Rhinelander | WI | — | ◇ UNVERIFIED |
| NINrlj, INC. | Browns Summit | NC | — | ◇ UNVERIFIED |
