| MRManufactured Rubber Products Company Incorporated | Philadelphia | PA | — | ◇ UNVERIFIED |
| MIManufacturers Industrial Group LLC | Athens | TN | — | ◇ UNVERIFIED |
| MAMargus Auto Electric Exchange INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| MHMars Hill Properties 50th LLC | Seattle | WA | — | ◇ UNVERIFIED |
| MBMartin Barkey Racing Products (mbrp Ltd) | Huntsville, Ontario, Ca | IL | — | ◇ UNVERIFIED |
| MRMassey Road Facility | Tyler | TX | — | ◇ UNVERIFIED |
| MPMaster Power Transmission INC | Greenville | SC | — | ◇ UNVERIFIED |
 Matrix Composites INC | Rockledge | FL | — | ◇ UNVERIFIED |
| M8Max 8 Group, INC. | Flushing | NY | — | ◇ UNVERIFIED |
| MFMaxair Four Seasons Fort Worth Ops | Fort Worth | TX | — | ◇ UNVERIFIED |
| MFMaxion Fumagalli Automotive USA INC | Troy | MI | — | ◇ UNVERIFIED |
| MGMaxton Group INC | Ormond Beach | FL | — | ◇ UNVERIFIED |
| MDMay Day Auto Classic Parts, Inc | Levittown | PA | — | ◇ UNVERIFIED |
| MTMay Trucking | Phelan | CA | — | ◇ UNVERIFIED |
 Mayville Engineering Company INC Dba Mec | Vanderbilt | MI | — | ◇ UNVERIFIED |
| Mayville Engineering Company, INC. (mec) - Virginia Main Plant - Wytheville | Wytheville | VA | — | ◇ UNVERIFIED |
| MEMbk Enterprises, INC. Dba Mbk Tape Solutions | Chatsworth | CA | — | ◇ UNVERIFIED |
| MEMcardle Enterprises | Charlotte | NC | — | ◇ UNVERIFIED |
| MEMccarty Equipment Co., LTD. | Laredo | TX | — | ◇ UNVERIFIED |
| MPMccauley Propeller Systems, INC | Vandalia | OH | — | ◇ UNVERIFIED |
| MDMcdonnel Douglas Missle Systems | Titusville | FL | — | ◇ UNVERIFIED |
| MDMcdonnell Douglas Astronautics CO | Pueblo | CO | — | ◇ UNVERIFIED |
| MGMc Gill Corporation | El Monte | CA | — | ◇ UNVERIFIED |
| MFMcintire Fabricators INC | Mc Intire | IA | — | ◇ UNVERIFIED |
| MRMcLeod Racing LLC | Anaheim | CA | — | ◇ UNVERIFIED |
| MTMcneilus Truck & Manufacturing INC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MRMc & R Enterprises INC Dba Bright Sky Industries | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| MSMean Stamping Industries | Vassar | MI | — | ◇ UNVERIFIED |
| MAMeggitt Aircraft Braking Systems CORP | Danville | KY | — | ◇ UNVERIFIED |
| MMM&e Machine and Engineering CO | Murrieta | CA | — | ◇ UNVERIFIED |
| MAMenasco Aerospace-texas | Euless | TX | — | ◇ UNVERIFIED |
| MTMendeola Transaxles INC | National City | CA | — | ◇ UNVERIFIED |
| MUMercedes-benz US International - Bibb County Campus | Woodstock | AL | — | ◇ UNVERIFIED |
| MPMercury Powerboats | Monticello | AR | — | ◇ UNVERIFIED |
| MAMeridan Automotive Systems | Ionia | MI | — | ◇ UNVERIFIED |
| MAMeridian Automotive Systems INC | Centralia | IL | — | ◇ UNVERIFIED |
| MHMeritor Heavy Vehicle Systems, LLC | Forest City | NC | — | ◇ UNVERIFIED |
| MIMeritor, INC. | Kennesaw | GA | — | ◇ UNVERIFIED |
| MCMerrill Corporation | Clearfield | UT | — | ◇ UNVERIFIED |
| MEMertz Enterprises INC Dba Db Sales & Service | Garden Grove | CA | — | ◇ UNVERIFIED |
| MSMessier Service America INC | Sterling | VA | — | ◇ UNVERIFIED |
| MTMetalcraft Technolgies INC. | Cedar City | UT | — | ◇ UNVERIFIED |
| MMMethods Machine Tools INC | Corona | CA | — | ◇ UNVERIFIED |
| MIMetro Industries, INC. | Grandview | MO | — | ◇ UNVERIFIED |
| MDMfg Div | Tulsa | OK | — | ◇ UNVERIFIED |
| MGM - G Industries INC | Long Beach | CA | — | ◇ UNVERIFIED |
| MAMgm Auto Body INC | Framingham | MA | — | ◇ UNVERIFIED |
| MBMichael Blankenship | Marysville | WA | — | ◇ UNVERIFIED |
| MRMiddle River Aerostructure Systems | Middle River | MD | — | ◇ UNVERIFIED |
| MPMidway Products Group, INC. | Greenwich | OH | — | ◇ UNVERIFIED |
