| MEMathis Excavating | Du Quoin | IL | — | ◇ UNVERIFIED |
| MIMatlab Incorporated Ramseur Facility | Ramseur | NC | — | ◇ UNVERIFIED |
| MIMatlab, INC. - Plants 1-4, 5, 7, 8 and 11 | Asheboro | NC | — | ◇ UNVERIFIED |
| MPMato Plastics INC. | Valencia | CA | — | ◇ UNVERIFIED |
 Matrix Composites INC | Rockledge | FL | — | ◇ UNVERIFIED |
| MWMatrix Wire INC. | Auburn | AL | — | ◇ UNVERIFIED |
 Matthews International Corporation | Kingwood | WV | — | ◇ UNVERIFIED |
| MPMatthews Paint CO | Pleasant Prairie | WI | — | ◇ UNVERIFIED |
| MPMatthews Plating INC | Jackson | MI | — | ◇ UNVERIFIED |
| MLMatt Leigh | Pontiac | IL | — | ◇ UNVERIFIED |
| MCMauser CORP | Blacklick | OH | — | ◇ UNVERIFIED |
| MPMauser Packaging Solutions | Charlotte | NC | — | ◇ UNVERIFIED |
| MUMauser Usa, LLC (formerly Berenfield Containers) | Pine Bluff | AR | — | ◇ UNVERIFIED |
| MPMaverick Powder Coat & Sandblast | Anaheim | CA | — | ◇ UNVERIFIED |
| MMaxtrade | South El Monte | CA | — | ◇ UNVERIFIED |
| MRMaxxim Rebuild CO LLC | Lyburn | WV | — | ◇ UNVERIFIED |
| MMMayfair Molded Products CORP | Schiller Park | IL | — | ◇ UNVERIFIED |
| MIMay Industries | Phoenix | AZ | — | ◇ UNVERIFIED |
| MEMayville Engineering Company | Wytheville | VA | — | ◇ UNVERIFIED |
 Mayville Engineering Company, INC. (mec) - Virginia Main Plant - Wytheville | Wytheville | VA | — | ◇ UNVERIFIED |
| MWMazzella Welding & Fabrication INC | Wellsburg | WV | — | ◇ UNVERIFIED |
| MIM-b Industries Wwtp | Rosman | NC | — | ◇ UNVERIFIED |
| MBM & B Metal Products | South Hill | VA | — | ◇ UNVERIFIED |
| MAMcabee Assembly Facility | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| MFMcabery Foundry, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MIMcalpin Industries INC | Macedon | NY | — | ◇ UNVERIFIED |
| MSMcb Steel, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| MBMccann Barrel | Milwaukee | WI | — | ◇ UNVERIFIED |
| MPMccauley Propeller Systems, INC | Vandalia | OH | — | ◇ UNVERIFIED |
| MTMccay Tool & Engineering Company | Fenton | MO | — | ◇ UNVERIFIED |
| MPMcclarin Plastics LLC | Hanover | PA | — | ◇ UNVERIFIED |
| MDMcconnell Drum Service INC | Doraville | GA | — | ◇ UNVERIFIED |
| MMMccormick & Mccormick Investments, LLC | Little Rock | AR | — | ◇ UNVERIFIED |
| MPMccormick Paint Works Company | Rockville | MD | — | ◇ UNVERIFIED |
| MIMcdermott INC | Gibson | LA | — | ◇ UNVERIFIED |
| MIMcdermott INC - Morgan City Fabrication Facility - Amelia Yard | Amelia | LA | — | ◇ UNVERIFIED |
| MDMcdonnell Douglas Astronautics CO | Pueblo | CO | — | ◇ UNVERIFIED |
| MTMce Technologies INC | Seattle | WA | — | ◇ UNVERIFIED |
| MMMcgill Manufacturing Company | Valparaiso | IN | — | ◇ UNVERIFIED |
| MPMchenry Public Works Garage | Mchenry | IL | — | ◇ UNVERIFIED |
| MCMcjunkin CORP | Princeton | WV | — | ◇ UNVERIFIED |
| MVMckenzie Valve & Machining CO | Mckenzie | TN | — | ◇ UNVERIFIED |
| MPMckinney Products | Scranton | PA | — | ◇ UNVERIFIED |
| MBMclanahan Beaver Street Facility | Hollidaysburg | PA | — | ◇ UNVERIFIED |
 Mclaughlin Body CO | East Moline | IL | — | ◇ UNVERIFIED |
| MEMclellan Equipment INC | Hanford | CA | — | ◇ UNVERIFIED |
| MSMclouth Steel Gibraltar Plant | Gibraltar | MI | — | ◇ UNVERIFIED |
| MPMcmaster Plating | Longview | TX | — | ◇ UNVERIFIED |
| MEMcneal Enterprises | San Jose | CA | — | ◇ UNVERIFIED |
| MSMcneely Steel & Supply | Leavenworth | KS | — | ◇ UNVERIFIED |
| MIMct Industries Inc, Government Manufacturing | Bernalillo | NM | — | ◇ UNVERIFIED |
| MCMcwane Cast Iron Pipe CO. | Birmingham | AL | — | ◇ UNVERIFIED |
| MBM-d Building Products | Gainesville | GA | — | ◇ UNVERIFIED |
| MDMd Designs Inc-metal Decor | Springfield | IL | — | ◇ UNVERIFIED |
| MMM&d Metal Finishing Specialties INC - Blaine | Blaine | MN | — | ◇ UNVERIFIED |
| MIMeadowvale INC | Sandwich | IL | — | ◇ UNVERIFIED |
| MCMeadwestvaco Calmar INC. | Winfield | KS | — | ◇ UNVERIFIED |
 Medegen Medical Products, LLC | Northglenn | CO | — | ◇ UNVERIFIED |
| MPMedford Plating INC | Medford | OR | — | ◇ UNVERIFIED |
| MIMedicote, INC. | Bristol | RI | — | ◇ UNVERIFIED |
| MPMedina Plating CORP Plant 2 | Medina | OH | — | ◇ UNVERIFIED |
| MIMedline INC. | Mundelein | IL | — | ◇ UNVERIFIED |
| MFMedora Fs, INC. | Medora | IL | — | ◇ UNVERIFIED |
| MLMedranos Landscape INC | Rockford | IL | — | ◇ UNVERIFIED |
| MIMegamet Industries, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| MTMeggit Training Systems | Suwanee | GA | — | ◇ UNVERIFIED |
| MTMeioco Terminal | Ashkum | IL | — | ◇ UNVERIFIED |
| MBMel Bernie & CO INC | Burbank | CA | — | ◇ UNVERIFIED |
| MCMel Chemicals INC | Flemington | NJ | — | ◇ UNVERIFIED |
| MEMelco Engraving INC | Rochester Hills | MI | — | ◇ UNVERIFIED |
| MMMelrose Metal Products, INC | Fremont | CA | — | ◇ UNVERIFIED |
| MCMelsur CORP | Westminster | VT | — | ◇ UNVERIFIED |
| MMMeminger Metal Finishing INC | Aledo | IL | — | ◇ UNVERIFIED |
| MWMemphis Wire & Iron Works Incorporated | Memphis | TN | — | ◇ UNVERIFIED |
| MIMenard INC Fleet North | Eau Claire | WI | — | ◇ UNVERIFIED |
| MCMentor Corp_(was Gardener-denver Co) | Denver | CO | — | ◇ UNVERIFIED |
| MMMerchants Metals | Statesville | NC | — | ◇ UNVERIFIED |
| MMMerchants Metals | Howell | MI | — | ◇ UNVERIFIED |
| MCMerck & Co, LLC | Boulder | CO | — | ◇ UNVERIFIED |
| MAMercury Aircraft INC - Central Division | Hammondsport | NY | — | ◇ UNVERIFIED |
| MPMercury Plastics, INC. | City of Industry | CA | — | ◇ UNVERIFIED |
| MMMercy Medical Center | Redding | CA | — | ◇ UNVERIFIED |
| MAMeridian Automotive | Jackson | OH | — | ◇ UNVERIFIED |
| MAMeridian Automotive Systems | Shelbyville | IN | — | ◇ UNVERIFIED |
| MAMeridian Automotive Systems INC | Canandaigua | NY | — | ◇ UNVERIFIED |
| MGMerit Gear LLC | Antigo | WI | — | ◇ UNVERIFIED |
| MMMerit Metal Finishing Company, INC. | Bridgeport | CT | — | ◇ UNVERIFIED |
| MMeritor | York | SC | — | ◇ UNVERIFIED |
| MMeritor | Oshkosh | WI | — | ◇ UNVERIFIED |
| MHMeritor Heavy Vehicle Systems, LLC | Forest City | NC | — | ◇ UNVERIFIED |
| MHMeritor - Howell | Howell | MI | — | ◇ UNVERIFIED |
| MIMeritor, INC. | Maxton | NC | — | ◇ UNVERIFIED |
| MIMerkle-korff Industries- Plant 3 | Des Plaines | IL | — | ◇ UNVERIFIED |
| MAMerryman Aggregates | Harvard | IL | — | ◇ UNVERIFIED |
| MAMerryman Aggregates LLC | Woodstock | IL | — | ◇ UNVERIFIED |
| MEMerryman Excavation INC | Woodstock | IL | — | ◇ UNVERIFIED |
| MSMessier Service America INC | Sterling | VA | — | ◇ UNVERIFIED |
| MIMetaglo INC. | Mamaroneck | NY | — | ◇ UNVERIFIED |
| MCMetal Chem INC | Greer | SC | — | ◇ UNVERIFIED |
| MCMetal Coatings | Magna | UT | — | ◇ UNVERIFIED |
