| MSMontana Sulphur and Chemical Company | Billings | MT | — | ◇ UNVERIFIED |
| MRMontgomery Roessing Company | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MMMonticello Machine Shop INC | Monticello | KY | — | ◇ UNVERIFIED |
| MIMoog INC - Control Group | Elma | NY | — | ◇ UNVERIFIED |
| MFMoore Flame Cutting Company | Bloomfield Hills | MI | — | ◇ UNVERIFIED |
| MFMoore's Fiberglass, INC. | Walstonburg | NC | — | ◇ UNVERIFIED |
| MMMoorhead Machinery - Boiler CO | Minneapolis | MN | — | ◇ 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 |
| MEMps Enterprises | Hobbs | NM | — | ◇ UNVERIFIED |
| MAMq America | Mission | TX | — | ◇ UNVERIFIED |
| MWMr. Washerman | Houston | TX | — | ◇ UNVERIFIED |
| MSMsi Structural | South Gate | CA | — | ◇ UNVERIFIED |
| MPMt. Pleasant Mine Service | Mount Pleasant | PA | — | ◇ UNVERIFIED |
| MCMueller Construction Company | Sherman | TX | — | ◇ UNVERIFIED |
| MGMueller Gas Products INC | Jacksboro | TN | — | ◇ UNVERIFIED |
| MSMuhlhauser Steel INC | Bloomington | CA | — | ◇ UNVERIFIED |
| MSMuhlhauser Steel INC | Murrieta | CA | — | ◇ 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 |
| MCMvn Complete Solutions, INC | Fremont | CA | — | ◇ UNVERIFIED |
| MGMwc Group INC | Adelanto | CA | — | ◇ UNVERIFIED |
| MRMw Reid Welding INC Dba South Bay Welding | El Cajon | CA | — | ◇ UNVERIFIED |
| MMMyco Metals | Hemet | CA | — | ◇ UNVERIFIED |
| MDMyers Di Corporation | Barnegat | NJ | — | ◇ UNVERIFIED |
| NCNamasco Corporation | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NFNash Fabricators INC | Vista | CA | — | ◇ UNVERIFIED |
 Nashville Fabrication and Engineering Limited Partnership | Nashville | TN | — | ◇ UNVERIFIED |
| NSNashville Sheet Metal, LLC | Lebanon | TN | — | ◇ UNVERIFIED |
| NBNational Butane Gas Company, INC. | Memphis | TN | — | ◇ UNVERIFIED |
| NCNational Chimney Kentucky LLC Dba Magnaflex | Mount Sterling | KY | — | ◇ 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 Oilwell Varco | San Angelo | TX | — | ◇ UNVERIFIED |
| NONational Ordnance Automotive Manufacturing LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
| NWNational Welding Corporation | Midvale | UT | — | ◇ UNVERIFIED |
| NFNavarre Fabrication, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| NSNavasota Site | Navasota | TX | — | ◇ UNVERIFIED |
| NGNci Group INC. | Marietta | GA | — | ◇ UNVERIFIED |
| NGNci Group, INC | Mattoon | IL | — | ◇ UNVERIFIED |
| NGNci Group, INC | Lubbock | TX | — | ◇ UNVERIFIED |
| NMNefi Morales and Julie A. Ramos | Maywood | CA | — | ◇ UNVERIFIED |
| NHNeil H. Daniels, INC. | Ascutney | VT | — | ◇ UNVERIFIED |
| NMNeilson Manufacturing | Tulsa | OK | — | ◇ UNVERIFIED |
| NCNello Corporation B2 | South Bend | IN | — | ◇ UNVERIFIED |
| NINelson Iron Works | Seattle | WA | — | ◇ 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 Industries | Industry | CA | — | ◇ 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 |
| NINewfield Industries INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| NJNew Jersey Boom & Erectors | Henryville | PA | — | ◇ UNVERIFIED |
| NSNew Steel, INC. | Omaha | NE | — | ◇ UNVERIFIED |
| NRNexGen Rebar LLC | Harrisonburg | VA | — | ◇ UNVERIFIED |
| NGNext Generation Construction, LLC | New York | NY | — | ◇ UNVERIFIED |
| NGNGM Glass Metals, LLC | Woodbridge | VA | — | ◇ UNVERIFIED |
| NFNiagara Frontier Custom Fabrication, INC. | Buffalo | NY | — | ◇ UNVERIFIED |
| NINibco Inc.- Epic Building | Blytheville | AR | — | ◇ UNVERIFIED |
| NPNichols Propeller Company | Greenville | MS | — | ◇ UNVERIFIED |
| NMNick's Metal Fabricating & Sons, INC. | Chicago | IL | — | ◇ UNVERIFIED |
| NMNix Metals Fabrication Building Expansion | Poseyville | IN | — | ◇ UNVERIFIED |
| NCNooter Corporation | Saint Louis | MO | — | ◇ UNVERIFIED |
| NGNorma Group | Auburn Hills | MI | — | ◇ UNVERIFIED |
 North Alabama Fabricating Company, INC. | Glen Allen | AL | — | ◇ UNVERIFIED |
| NANorth American Construction Services, LLC | Birmingham | AL | — | ◇ UNVERIFIED |
| NCNorth Chicago Iron Works, INC. | North Chicago | IL | — | ◇ UNVERIFIED |
| NCNorth Coast Tool, INC. | Erie | PA | — | ◇ UNVERIFIED |
| NSNortheast Sheet Metal LLC | Hoboken | NJ | — | ◇ UNVERIFIED |
| NCNorthern California Framing & Carpentry, INC. | Ripon | CA | — | ◇ UNVERIFIED |
| NHNorthern Horizons INC | Solway | MN | — | ◇ UNVERIFIED |
| NONorthern Oregon Fabrication LLC | North Plains | OR | — | ◇ UNVERIFIED |
| NSNorthern Screw Machine Company INC | Saint Paul | MN | — | ◇ UNVERIFIED |
 Northland Machine INC | Cohasset | MN | — | ◇ UNVERIFIED |
| NSNorth Second Street Smithfield LLC Dba Con-quip | Burlington | KY | — | ◇ UNVERIFIED |
| NSNorth Shore Steel Co., INC. | Lynn | MA | — | ◇ UNVERIFIED |
| NSNorth Star Fabricators, INC. | Pocatello | ID | — | ◇ UNVERIFIED |
