| MGMic Group | Brenham | TX | — | ◇ UNVERIFIED |
| MAMichael Anthony Jewelers Incorporated | Mount Vernon | NY | — | ◇ UNVERIFIED |
| MSMichigan Steel, INC. | Muskegon | MI | — | ◇ UNVERIFIED |
| MMMiddletown Metal Works, INC. | Berea | KY | — | ◇ UNVERIFIED |
| MMMidland Metals Products | Chicago | IL | — | ◇ UNVERIFIED |
| MFMid-south Fabrications INC | Jemison | AL | — | ◇ UNVERIFIED |
| MMMidstate Manufacturing | Galesburg | IL | — | ◇ UNVERIFIED |
| MAMidwest Alloys Foundry | O Fallon | MO | — | ◇ UNVERIFIED |
| MSMidwestern Steel Fabricators Chicago LLC | Hammond | IN | — | ◇ UNVERIFIED |
| MFMidwest Fabrication and Steel LLC | Pueblo | CO | — | ◇ UNVERIFIED |
| MMMidwest Metallurgical Laboratory Site | Marshall | MI | — | ◇ UNVERIFIED |
| MIMiller Industrial | Kokomo | IN | — | ◇ UNVERIFIED |
 Miller Welding & Machine CO | Brookville | PA | — | ◇ UNVERIFIED |
| MCMills CO | Upper Sandusky | OH | — | ◇ UNVERIFIED |
| MSMissouri Steel Castings Incorporated | Joplin | MO | — | ◇ UNVERIFIED |
| MMModern Mechanical Fabrication INC | Champlain | NY | — | ◇ UNVERIFIED |
| MPModern Pattern & Foundry CO. INC. (mp) | Vernon | CA | — | ◇ UNVERIFIED |
| MCModineer Coatings Division South | South Bend | IN | — | ◇ UNVERIFIED |
 Modine Manufacturing CO | Clinton | TN | — | ◇ UNVERIFIED |
| MMMoment Metal LLC | Albany | NY | — | ◇ UNVERIFIED |
| MPMonitor Products INC | Hauppauge | NY | — | ◇ UNVERIFIED |
| MPMorgan Products | Valencia | CA | — | ◇ UNVERIFIED |
| MIMoritz International INC. (0370010048) | Mansfield | OH | — | ◇ UNVERIFIED |
| MIMor/ryde International INC | Elkhart | IN | — | ◇ UNVERIFIED |
| MSMorton Salt INC - Weeks Island Facility | New Iberia | LA | — | ◇ UNVERIFIED |
| MFMountaineer Fabricators INC | Nitro | WV | — | ◇ UNVERIFIED |
| MIMp Industries, INC. | O Fallon | MO | — | ◇ UNVERIFIED |
| MSM. Swift & Sons Gold Leaf | Hartford | CT | — | ◇ UNVERIFIED |
| MMMull Machine CO | Wheeling | WV | — | ◇ UNVERIFIED |
| MPMulti-spec Painting INC | Gardena | CA | — | ◇ UNVERIFIED |
| MCMunicipal Castings INC | Madison | MN | — | ◇ UNVERIFIED |
| MGMurray Grinding-dearborn Hgts | Dearborn Heights | MI | — | ◇ UNVERIFIED |
| MWM & W Alumium | Dewitt | NY | — | ◇ UNVERIFIED |
| NMNambe Mills, INC. | Espanola | NM | — | ◇ UNVERIFIED |
| NPNanoprecision Products | El Segundo | CA | — | ◇ UNVERIFIED |
| NANapa Auto Parts Machine Shop | Plymouth | IN | — | ◇ UNVERIFIED |
| NMNash Manufacturing & Grinding Services | Springfield | MA | — | ◇ UNVERIFIED |
| NMNational Metal Abrasive Company | Wadsworth | OH | — | ◇ UNVERIFIED |
| NFNatl Fabricators & Mach/north East Plt | North East | PA | — | ◇ UNVERIFIED |
| NMNci Mfg, INC. | Scottsboro | AL | — | ◇ UNVERIFIED |
| NFNeenah Foundry CO - Plants 2 and 3 (w2179) | Neenah | WI | — | ◇ UNVERIFIED |
| NINeo Industries (weirton) INC. | Weirton | WV | — | ◇ UNVERIFIED |
| NCNew Castle Foundry/new Castle | New Castle | PA | — | ◇ UNVERIFIED |
| NENew England Expert Technologies Ne Xt | Greenfield | MA | — | ◇ UNVERIFIED |
| NHNew Haven Foundry | New Haven | MI | — | ◇ UNVERIFIED |
| NWNfm Welding Engineers INC | Massillon | OH | — | ◇ UNVERIFIED |
| NPNickelson Plastics INC | Osceola | WI | — | ◇ UNVERIFIED |
| NINmi Industrial Holdings INC | Sacramento | CA | — | ◇ UNVERIFIED |
| NDNoco Distributing | Youngwood | PA | — | ◇ UNVERIFIED |
| NINorcold INC * | Gettysburg | OH | — | ◇ UNVERIFIED |
