| MMMa Metal | Edinburgh | IN | — | ◇ UNVERIFIED |
| MTManchester Tank and Equipment | Petersburg | VA | — | ◇ UNVERIFIED |
| MTManchester Tank & Equipment CO | Bedford | IN | — | ◇ UNVERIFIED |
| MTManchester Tank & Equipment CO | Elkhart | IN | — | ◇ UNVERIFIED |
| MPManco Plating INC | Newark | NJ | — | ◇ UNVERIFIED |
| MMMann Made Products | Waterville | KS | — | ◇ UNVERIFIED |
| MFMansfield Foundry Corporation | Mansfield | OH | — | ◇ UNVERIFIED |
| MEManufacturers Enameling CORP | Toledo | OH | — | ◇ UNVERIFIED |
| MGMaple Grove Tower Site | Maple Grove | MN | — | ◇ UNVERIFIED |
| MTMapp Technologies, L.l.c. | Joplin | MO | — | ◇ UNVERIFIED |
| MPMara Polishing & Plating CO INC | Newark | NJ | — | ◇ UNVERIFIED |
| MJMarathon Jewelry | Attleboro | MA | — | ◇ UNVERIFIED |
| MBMar Bal INC | Cuba | MO | — | ◇ UNVERIFIED |
| MCMarch Coatings INC | Brighton | MI | — | ◇ UNVERIFIED |
| MCMarch Coatings Plant 2 | Brighton | MI | — | ◇ UNVERIFIED |
| MPMarch Performance INC | Naples | FL | — | ◇ UNVERIFIED |
| MPMarion Process Solutions | Marion | IA | — | ◇ UNVERIFIED |
| MIMarjan INC | Waterbury | CT | — | ◇ UNVERIFIED |
| MVMark Vii Equipment Incorporated | Arvada | CO | — | ◇ UNVERIFIED |
| MIMarlen International INC | Riverside | MO | — | ◇ UNVERIFIED |
| MPMarlette Plating | Buffalo | NY | — | ◇ UNVERIFIED |
| MMMarmic Metal Treating | Saint Charles | MO | — | ◇ UNVERIFIED |
| MCMarox CORP | Holyoke | MA | — | ◇ UNVERIFIED |
| MTMarquette Tool & Die | Saint Louis | MO | — | ◇ UNVERIFIED |
| MDMarquis Dental Mfg CO INC | Aurora | CO | — | ◇ UNVERIFIED |
 Marsam Metal Finishing | New Britain | CT | — | ◇ UNVERIFIED |
| MCMars Company | Ocala | FL | — | ◇ UNVERIFIED |
| MSMarshalls Sandblasting and Painting | Willis | VA | — | ◇ UNVERIFIED |
| MPMarsh Plating CO | Buffalo | NY | — | ◇ UNVERIFIED |
| MCMar-tech CO. | Mount Juliet | TN | — | ◇ UNVERIFIED |
| MBMartin Brothers INC. | Winnsboro | LA | — | ◇ UNVERIFIED |
| MCMartin Container Service INC | Wilmington | CA | — | ◇ UNVERIFIED |
| MMMartin Metal Specialties | Philadelphia | PA | — | ◇ UNVERIFIED |
| MSMartin Specialty Coatings LLC | Shreveport | LA | — | ◇ UNVERIFIED |
| MPMasbro Polishing Company | Pawtucket | RI | — | ◇ UNVERIFIED |
| MCMasse Circuit CO | Methuen | MA | — | ◇ UNVERIFIED |
| MBMaster Blasters | Beaverdam | OH | — | ◇ UNVERIFIED |
| MMMastercraft Metal Finishing INC | Seattle | WA | — | ◇ UNVERIFIED |
| MHMaster Halco INC | Canton | MA | — | ◇ UNVERIFIED |
| MPMaster Plating | San Diego | CA | — | ◇ UNVERIFIED |
| MCMasters Corporation | Lowell | MA | — | ◇ UNVERIFIED |
| MTMatco Tools | Lakewood | NY | — | ◇ UNVERIFIED |
| MMatech | Salisbury | MD | — | ◇ UNVERIFIED |
| MPMaterial Processing INC | Riverview | MI | — | ◇ UNVERIFIED |
| MDMaterials Developement Corporation | Medford | MA | — | ◇ UNVERIFIED |
| MTMaterials Technology INC | Somerset | NJ | — | ◇ UNVERIFIED |
| MBMaterion Brush INC | Fremont | CA | — | ◇ UNVERIFIED |
| MMMathy Machine INC | Santee | CA | — | ◇ UNVERIFIED |
| MIMatlab Incorporated Ramseur Facility | Ramseur | NC | — | ◇ UNVERIFIED |
| MIMatlab, INC. - Plants 1-4, 5, 7, 8 and 11 | Asheboro | NC | — | ◇ UNVERIFIED |
 Matrix Machine and Repair INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| MPMatthews Plating INC | Jackson | MI | — | ◇ UNVERIFIED |
| MCMauell Corporation-utility Room | Dillsburg | PA | — | ◇ UNVERIFIED |
| MPMaverick Powder Coat & Sandblast | Anaheim | CA | — | ◇ UNVERIFIED |
| MMMaxcor Manufacturing INC | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MCMaxim Crane Works LP | Nitro | WV | — | ◇ UNVERIFIED |
| MIMay Industries | Phoenix | AZ | — | ◇ UNVERIFIED |
| MEMayville Engineering Company | Wytheville | VA | — | ◇ UNVERIFIED |
| MVMay-wilbert Vault-pt Huron | Port Huron | MI | — | ◇ UNVERIFIED |
| MIM-b Industries Wwtp | Rosman | NC | — | ◇ UNVERIFIED |
| MFMcabery Foundry, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MMMccormick & Mccormick Investments, LLC | Little Rock | AR | — | ◇ UNVERIFIED |
| MIMccullough Industries | Kenton | OH | — | ◇ UNVERIFIED |
| MMMcdonald Mfg INC | Artesia | CA | — | ◇ UNVERIFIED |
| MAMcgill Air Flow LLC | Bennington | VT | — | ◇ UNVERIFIED |
| MDMcgill Development Corporation | Westerville | OH | — | ◇ UNVERIFIED |
| MIMcgill INC | Marengo | IL | — | ◇ UNVERIFIED |
| MMMckinstry Metal Works INC. | Chicopee | MA | — | ◇ UNVERIFIED |
| MSMclouth Steel Gibraltar Plant | Gibraltar | MI | — | ◇ UNVERIFIED |
| MPMcmaster Plating | Longview | TX | — | ◇ UNVERIFIED |
| MMMcmillan Mechanical & Machine Co., INC. | Shreveport | LA | — | ◇ UNVERIFIED |
| MEMcstowe Engineering | East Bridgewater | MA | — | ◇ UNVERIFIED |
| MCMcwane Cast Iron Pipe CO. | Birmingham | AL | — | ◇ UNVERIFIED |
| MDMd Designs Inc-metal Decor | Springfield | IL | — | ◇ UNVERIFIED |
| MMM&d Metal Finishing Specialties INC - Blaine | Blaine | MN | — | ◇ UNVERIFIED |
| MSMd Stainless Services INC | Downey | CA | — | ◇ UNVERIFIED |
| MFMeadville Forging CO | Cambridge Springs | PA | — | ◇ UNVERIFIED |
| MTMeca & Technology Machine INC | Green Bay | WI | — | ◇ UNVERIFIED |
| MPMedford Plating INC | Medford | OR | — | ◇ UNVERIFIED |
| MIMedicote, INC. | Bristol | RI | — | ◇ UNVERIFIED |
| MBMedina Blanking INC. | Valley City | OH | — | ◇ UNVERIFIED |
| MPMedina Plating CORP Plant 2 | Medina | OH | — | ◇ UNVERIFIED |
| MCMedin CORP | Totowa | NJ | — | ◇ UNVERIFIED |
| MIMegamet Industries, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| MMMegawatt Machine Services | Somerset | NJ | — | ◇ UNVERIFIED |
| MBMel Bernie & CO INC | Burbank | CA | — | ◇ UNVERIFIED |
| MEMelco Engraving INC | Rochester Hills | MI | — | ◇ UNVERIFIED |
| MMMeminger Metal Finishing INC | Aledo | IL | — | ◇ UNVERIFIED |
| MAMercury Aircraft Bath Plant | Bath | NY | — | ◇ UNVERIFIED |
| MAMercury Aircraft INC | Hammondsport | NY | — | ◇ UNVERIFIED |
| MMMercury Manufacturing Company | Wyandotte | MI | — | ◇ UNVERIFIED |
| MMMerit Metal Finishing Company, INC. | Bridgeport | CT | — | ◇ UNVERIFIED |
| MIMeritor Industrial Products LLC | Chicago | IL | — | ◇ UNVERIFIED |
| MSMerit Specialities-merit Specialities | Saint Louis | MO | — | ◇ UNVERIFIED |
| MBMetal Bellows Corporation | Moorpark | CA | — | ◇ UNVERIFIED |
| MBMetal Box International INC | Franklin Park | IL | — | ◇ UNVERIFIED |
| MCMetal Coatings | Magna | UT | — | ◇ UNVERIFIED |
| MCMetal Components INC | Paterson | NJ | — | ◇ UNVERIFIED |
| MCMetal Components INC | Wyoming | MI | — | ◇ UNVERIFIED |
| MCMetal Craft Engineering | Fenwick | WV | — | ◇ UNVERIFIED |
