| 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 |
| MSMulich Services LLC | Bonner Springs | KS | — | ◇ UNVERIFIED |
| MPMulti-craft Plastics | Portland | OR | — | ◇ UNVERIFIED |
| MIMunroe, Incorporated | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MSMunster Steel Company | Munster | IN | — | ◇ UNVERIFIED |
| MDMunters Des Champs | Buena Vista | VA | — | ◇ UNVERIFIED |
| MLMurphree Leasing LLC | Bristol | WI | — | ◇ UNVERIFIED |
| MFMurray Fabrication Facility | Murray | UT | — | ◇ UNVERIFIED |
| MMMuskogee Metal Fabricators, INC. | Muskogee | OK | — | ◇ UNVERIFIED |
| MTMuskogee Technology | Atmore | AL | — | ◇ UNVERIFIED |
| MFMustang Fabricating a Division of Hotel & Restaurant Supply, INC. | Savannah | TN | — | ◇ UNVERIFIED |
| MIMutual Industries INC | Seattle | WA | — | ◇ UNVERIFIED |
| MWMutual Welding CO LTD | Kapolei | HI | — | ◇ UNVERIFIED |
| MWMutual Welding Company, LTD | Pearl Harbor | HI | — | ◇ UNVERIFIED |
| MWMutual Welding Company, LTD | Kapolei | HI | — | ◇ UNVERIFIED |
| MGMwc Group INC | Adelanto | CA | — | ◇ UNVERIFIED |
| MWM - W Fab INC. Dba Ace Fabrication and Machine, in | Smithfield | NC | — | ◇ UNVERIFIED |
| MRMw Reid Welding INC Dba South Bay Welding | El Cajon | CA | — | ◇ UNVERIFIED |
| MMMyco Metals | Hemet | CA | — | ◇ UNVERIFIED |
| MIMyrtle Industries INC | Jackson | MI | — | ◇ UNVERIFIED |
| MIMy-signguy.com, INC. | Glenview | IL | — | ◇ UNVERIFIED |
| NCNai Cranes LLC | Woburn | MA | — | ◇ UNVERIFIED |
| NINailor Industries Houston Facility | Houston | TX | — | ◇ UNVERIFIED |
| NINailor Industries of Texas INC. | North Las Vegas | NV | — | ◇ UNVERIFIED |
| NCNamasco Corporation | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NMNambe Mills, INC. | Espanola | NM | — | ◇ UNVERIFIED |
| NMN.a. Metal Services INC. | Rockland | MA | — | ◇ UNVERIFIED |
| NMNano Manufacturing INC | North Branch | MN | — | ◇ UNVERIFIED |
| NPNanoprecision Products | El Segundo | CA | — | ◇ UNVERIFIED |
| NCNapa County Roads | Napa | CA | — | ◇ UNVERIFIED |
| NPNapa Pipe CORP | Napa | CA | — | ◇ UNVERIFIED |
| NSNarito Sheetmetal & Mechanical Corporation | Waipahu | HI | — | ◇ UNVERIFIED |
| NVNashoba Valley Structural | Lunenburg | MA | — | ◇ UNVERIFIED |
 Nashville Fabrication and Engineering Limited Partnership | Nashville | TN | — | ◇ UNVERIFIED |
| NSNashville Sheet Metal, LLC | Lebanon | TN | — | ◇ UNVERIFIED |
| NCNational Chimney Kentucky LLC Dba Magnaflex | Mount Sterling | KY | — | ◇ UNVERIFIED |
| NENational Eastern Corporation | Plainville | CT | — | ◇ UNVERIFIED |
| NFNational Frame Rail | Sanger | TX | — | ◇ UNVERIFIED |
| NINational Industrial Concepts, INC. | Gallatin | TN | — | ◇ UNVERIFIED |
| NMNational Maintenance Contracting CORP. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| NMNational Metal Fabrication INC | Ontario | CA | — | ◇ UNVERIFIED |
| NMNational Metal Fabrication,j. Delvillar | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| NONational Ordnance Automotive Manufacturing LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
| NPNational Products INC 1025 S Elmgrove St | Seattle | WA | — | ◇ UNVERIFIED |
| NPNational Products S Elmgrove | Seattle | WA | — | ◇ UNVERIFIED |
| NSNational Sintered Alloys Incorporated | Clinton | CT | — | ◇ UNVERIFIED |
| NSNational Sintered Alloys Incorporated | Clinton | CT | — | ◇ UNVERIFIED |
| NNNative Nations Procurement Systems INC. | Dallas | TX | — | ◇ UNVERIFIED |
| NFNavarre Fabrication, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| NSNavasota Site | Navasota | TX | — | ◇ UNVERIFIED |
| NHNb Handy | Lynchburg | VA | — | ◇ UNVERIFIED |
| NDN.c. Dac - Correction Enterprises (franklin) Sign Plant | Bunn | NC | — | ◇ UNVERIFIED |
| NCNch Corporation | Lancaster | TX | — | ◇ UNVERIFIED |
| NBNci Bldg Sys Inc/ambridge | Ambridge | PA | — | ◇ UNVERIFIED |
| NGNci Group INC. | Rome | NY | — | ◇ UNVERIFIED |
| NGNci Group INC. | Omaha | NE | — | ◇ UNVERIFIED |
| NGNci Group, INC | Lubbock | TX | — | ◇ UNVERIFIED |
| NGNci Group, INC | Mattoon | IL | — | ◇ UNVERIFIED |
| NMNc Manufacturing | Crestview | FL | — | ◇ UNVERIFIED |
| NSNc Stauffer & Sons, INC. | Factoryville | PA | — | ◇ UNVERIFIED |
| NCNeapco Components | Beatrice | NE | — | ◇ UNVERIFIED |
| NMNefi Morales and Julie A. Ramos | Maywood | CA | — | ◇ UNVERIFIED |
| NMNeilson Manufacturing | Tulsa | OK | — | ◇ UNVERIFIED |
| NINelco, INC. | Los Angeles | CA | — | ◇ UNVERIFIED |
| NCNello Corporation B2 | South Bend | IN | — | ◇ UNVERIFIED |
| NSNelsen Sheet Metal INC. | Brigham City | UT | — | ◇ UNVERIFIED |
| NANelson Avenue | Concord | CA | — | ◇ UNVERIFIED |
| NGNelson Global - Fortune Circle | Indianapolis | IN | — | ◇ UNVERIFIED |
| NGNelson Global Products | Greenwood | IN | — | ◇ UNVERIFIED |
| NINelson Iron Works | Seattle | WA | — | ◇ UNVERIFIED |
| NWNelson Williams Linings INC | Mountain Iron | MN | — | ◇ UNVERIFIED |
| NFNeo Fab LLC / Neo Fab Metal Fabrication Facility | Miami | OK | — | ◇ UNVERIFIED |
| NUNeoplan USA CORP | Lamar | CO | — | ◇ UNVERIFIED |
| NHNepturne Heat Treating, INC. | Corpus Christi | TX | — | ◇ UNVERIFIED |
| NMNetzer Metalcraft,Inc. | Essex | MD | — | ◇ 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 |
| NNevatronix | Las Vegas | NV | — | ◇ UNVERIFIED |
| NANew Age Steel Products, INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| NBNew Beginnings Enterprise INC. | Richmond | VA | — | ◇ UNVERIFIED |
| NBNew Braunfels Facility | San Antonio | TX | — | ◇ UNVERIFIED |
| NMNewburgh Metals, INC. | Newburgh | NY | — | ◇ UNVERIFIED |
| NBNew Business Systems, Inc. | Amityville | NY | — | ◇ UNVERIFIED |
| NCNew Century Industries | Industry | CA | — | ◇ UNVERIFIED |
| NCNew Century Plaza | Los Angeles | CA | — | ◇ UNVERIFIED |
| NINewco Industries LLC Dba Nex Solutions | Litchfield | MI | — | ◇ UNVERIFIED |
| NDNew Deal Metal Buildings, LLC | Denham Springs | LA | — | ◇ UNVERIFIED |
| NENew England Awards and Trophies | Woodstock | CT | — | ◇ 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 |
| NENew England Stainless Steel Fabrication | Weymouth | MA | — | ◇ UNVERIFIED |
| NENew England Wirecloth Company, INC. | Fitchburg | MA | — | ◇ UNVERIFIED |
