 Mills Manufacturing INC | Earlville | IA | — | ◇ UNVERIFIED |
| MMMill-Tech Manufacturing LLC | New London | WI | — | ◇ UNVERIFIED |
| MVMillvale Vault | Glenshaw | PA | — | ◇ UNVERIFIED |
| MMMil Mar Centruy CORP. | Dayton | OH | — | ◇ UNVERIFIED |
 Minestone Construction | Hillsborough | NJ | — | ◇ UNVERIFIED |
| MEMingle & Elrod INC Dba Performance Steel INC | Murfreesboro | TN | — | ◇ UNVERIFIED |
| MUMinova USA INC | South Point | OH | — | ◇ UNVERIFIED |
| MAMinute-man Anchors, INC. | East Flat Rock | NC | — | ◇ UNVERIFIED |
| MSMinuteman Spring LLC | Millbury | MA | — | ◇ UNVERIFIED |
| MCMirarca Custom Metal Design, LLC | Denham Springs | LA | — | ◇ UNVERIFIED |
| MMMisener Marine Construction, INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MVMississippi Valley Struetural Steel,div. | Chattanooga | TN | — | ◇ UNVERIFIED |
| MVMissouri Valley Steel Company | Sioux City | IA | — | ◇ UNVERIFIED |
| MSMiss Steel LLC | Mechanicville | NY | — | ◇ UNVERIFIED |
| MIMitchco INC | Ponca City | OK | — | ◇ UNVERIFIED |
| MUMitek USA INC | Saint Charles | MO | — | ◇ UNVERIFIED |
| MCMjk Custom Fab and Coatings LLC | Ogden | UT | — | ◇ UNVERIFIED |
| MJM & J Materials, INC. | Trussville | AL | — | ◇ UNVERIFIED |
| MSMka Spray Service | Lawrence | MA | — | ◇ UNVERIFIED |
| MFMKR Fabrication Properties, LLC | Saginaw | MI | — | ◇ UNVERIFIED |
| MPMld Properties, LLC | Bakersfield | CA | — | ◇ UNVERIFIED |
| MIMmi Industrial & Steel, LLC | Mesa | AZ | — | ◇ UNVERIFIED |
| MMM - M Machine and Fab INC | Cannon Falls | MN | — | ◇ UNVERIFIED |
| MSMM Systems OPCO, LLC | Pendergrass | GA | — | ◇ UNVERIFIED |
| MIMNM Industries LLC | Denver | CO | — | ◇ UNVERIFIED |
| MMModern Metal Masters Inc | Phoenix | AZ | — | ◇ UNVERIFIED |
| MWModern Welding CO Ky INC | Madisonville | KY | — | ◇ UNVERIFIED |
| MWModern Welding CO of Ky | Bowling Green | KY | — | ◇ UNVERIFIED |
| MMModine Mfg CO - Former Site of | Washington | IA | — | ◇ UNVERIFIED |
| MSModular Steel Structures | Houston | TX | — | ◇ UNVERIFIED |
| MWMollett Welding and Mine Service INC. | Stollings | WV | — | ◇ UNVERIFIED |
| MWMonarch Ware INC | Algoma | WI | — | ◇ UNVERIFIED |
| MWMonkey Wrench Fabrication L.l.c. | Bainbridge Island | WA | — | ◇ UNVERIFIED |
| MCMonlan CORP | Kalamazoo | MI | — | ◇ UNVERIFIED |
| MIMonogram Ind, Monogram Aerospace | Los Angeles | CA | — | ◇ UNVERIFIED |
| MCMonsanto Company | Anaheim | CA | — | ◇ UNVERIFIED |
| MMMonticello Machine Shop INC | Monticello | KY | — | ◇ UNVERIFIED |
| MLMoreco, LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MCMorelock & Company Ironworks INC. | New Albany | MS | — | ◇ UNVERIFIED |
| MCMorelock & Company Ironworks, INC. | Williamson | GA | — | ◇ UNVERIFIED |
| MIMorey Industries, Inc., Dba Westmont Engineering Company | Broadview | IL | — | ◇ UNVERIFIED |
| MFMorris Fabrication Company, LLC | Denton | TX | — | ◇ UNVERIFIED |
| MFMorrison Fabrication, LLC | Downey | ID | — | ◇ UNVERIFIED |
| MEMorse Estate, LLC | Foxboro | MA | — | ◇ UNVERIFIED |
| MAMoses and Tami Guillen | Gilbert | AZ | — | ◇ UNVERIFIED |
| MSMountain State Steel | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MSMountain Steel & Supply Company | Denver | CO | — | ◇ UNVERIFIED |
| MVMountain Vista Fabrication LLC | Irma | WI | — | ◇ UNVERIFIED |
| MAMouron and Company | Indianapolis | IN | — | ◇ UNVERIFIED |
| MAMq America | Mission | TX | — | ◇ UNVERIFIED |
| MWMr. Washerman | Houston | TX | — | ◇ UNVERIFIED |
| MPMt. Pleasant Mine Service | Mount Pleasant | PA | — | ◇ UNVERIFIED |
| MCMueller Construction Company | Sherman | TX | — | ◇ UNVERIFIED |
| MSMuhlhauser Steel INC | Murrieta | CA | — | ◇ UNVERIFIED |
| MSMuhlhauser Steel INC | Bloomington | CA | — | ◇ UNVERIFIED |
| MMMulberry Manufacturing CO | Mulberry | FL | — | ◇ UNVERIFIED |
| MPMulti-craft Plastics | Portland | OR | — | ◇ UNVERIFIED |
| MSMunster Steel Company | Munster | IN | — | ◇ UNVERIFIED |
| MFMustang Fabricating a Division of Hotel & Restaurant Supply, INC. | Savannah | TN | — | ◇ UNVERIFIED |
| MWMutual Welding CO LTD | Kapolei | HI | — | ◇ UNVERIFIED |
| MWMutual Welding Company, LTD | Kapolei | HI | — | ◇ UNVERIFIED |
| MWMutual Welding Company, LTD | Pearl Harbor | HI | — | ◇ UNVERIFIED |
| MGMwc Group INC | Adelanto | CA | — | ◇ UNVERIFIED |
| MRMw Reid Welding INC Dba South Bay Welding | El Cajon | CA | — | ◇ UNVERIFIED |
| MMMyco Metals | Hemet | CA | — | ◇ UNVERIFIED |
| NCNai Cranes LLC | Woburn | MA | — | ◇ UNVERIFIED |
| NCNamasco Corporation | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NVNashoba Valley Structural | Lunenburg | MA | — | ◇ UNVERIFIED |
 Nashville Fabrication and Engineering Limited Partnership | Nashville | TN | — | ◇ UNVERIFIED |
| NSNashville Sheet Metal, LLC | Lebanon | TN | — | ◇ UNVERIFIED |
| NENational Eastern Corporation | Plainville | CT | — | ◇ UNVERIFIED |
| NFNational Frame Rail | Sanger | TX | — | ◇ UNVERIFIED |
| NMNational Maintenance Contracting CORP. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| NMNational Metal Fabrication,j. Delvillar | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NONational Ordnance Automotive Manufacturing LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
| NFNavarre Fabrication, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| NBNci Bldg Sys Inc/ambridge | Ambridge | PA | — | ◇ UNVERIFIED |
| NGNci Group, INC | Mattoon | IL | — | ◇ UNVERIFIED |
| NGNci Group, INC | Lubbock | TX | — | ◇ UNVERIFIED |
| NMNefi Morales and Julie A. Ramos | Maywood | CA | — | ◇ UNVERIFIED |
| NMNeilson Manufacturing | Tulsa | OK | — | ◇ UNVERIFIED |
| NCNello Corporation B2 | South Bend | IN | — | ◇ UNVERIFIED |
| NINelson Iron Works | Seattle | WA | — | ◇ UNVERIFIED |
| NUNeoplan USA CORP | Lamar | CO | — | ◇ UNVERIFIED |
| NHNepturne Heat Treating, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| NINeufeldt Industrial Services INC Dba Neufab | Red Wing | MN | — | ◇ UNVERIFIED |
| NCNeumetal Corporation | New London | WI | — | ◇ UNVERIFIED |
| NPNevada Precision Sheet Metal, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| NSNevada Steel Services LLC | Sparks | NV | — | ◇ UNVERIFIED |
| NANew Age Steel Products, INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| NBNew Beginnings Enterprise INC. | Richmond | VA | — | ◇ UNVERIFIED |
| NCNew Century Plaza | Los Angeles | CA | — | ◇ UNVERIFIED |
| NINewco Industries LLC Dba Nex Solutions | Litchfield | MI | — | ◇ UNVERIFIED |
| NENew England Bridge Products INC. | Lynn | MA | — | ◇ UNVERIFIED |
| NENew England Cage and Fence CORP | Windsor | CT | — | ◇ UNVERIFIED |
| NENew England Copperworks, INC. | Smithfield | RI | — | ◇ UNVERIFIED |
| NENew England Inspection, INC. | South Portland | ME | — | ◇ UNVERIFIED |
| NJNew Jersey Boom & Erectors | Henryville | PA | — | ◇ UNVERIFIED |
| NMNew Millenium Building Systems | Continental | OH | — | ◇ UNVERIFIED |
| NMNew Millennium Building System S INC | Florence | SC | — | ◇ UNVERIFIED |
