| MAMarvel-schebler Aircraft Carburetors LLC | Gibsonville | NC | — | ◇ UNVERIFIED |
| MSMarvel Schebler LLC | Burlington | NC | — | ◇ UNVERIFIED |
| MRMassey Road Facility | Tyler | TX | — | ◇ UNVERIFIED |
| MLMatella LLC | Bellingham | WA | — | ◇ UNVERIFIED |
| MCMathewson Corporation | Quincy | MA | — | ◇ 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 |
| MEMcardle Enterprises | Charlotte | NC | — | ◇ 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 |
| MMM&e Machine and Engineering CO | Murrieta | CA | — | ◇ UNVERIFIED |
| MTMendeola Transaxles INC | National City | CA | — | ◇ UNVERIFIED |
| MUMercedes-benz US International - Bibb County Campus | Woodstock | AL | — | ◇ UNVERIFIED |
| MMMercury Marine - Plant 33 | Oshkosh | WI | — | ◇ UNVERIFIED |
| MMMercury Marine - Plant 36 | Fond Du Lac | WI | — | ◇ UNVERIFIED |
| MMMercury Marine Plant 6 | Oshkosh | WI | — | ◇ 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 |
| MEMertz Enterprises INC Dba Db Sales & Service | Garden Grove | CA | — | ◇ UNVERIFIED |
| MFMetaldyne - Fremont | Fremont | IN | — | ◇ UNVERIFIED |
| MSMetaldyne Sinterforged Products LLC | North Vernon | IN | — | ◇ UNVERIFIED |
| MLMetavation, LLC | Traverse City | MI | — | ◇ UNVERIFIED |
| MMMethods Machine Tools INC | Corona | CA | — | ◇ UNVERIFIED |
| MAMgm Auto Body INC | Framingham | MA | — | ◇ UNVERIFIED |
| MBMichael Blankenship | Marysville | WA | — | ◇ UNVERIFIED |
| MMMid-continent Mfg. | Wichita | KS | — | ◇ UNVERIFIED |
| MPMidway Products Group, INC. | Greenwich | OH | — | ◇ UNVERIFIED |
| MCMiller Cat Corporation | Santa Clara | CA | — | ◇ UNVERIFIED |
| MEMiller Equipment Sales LLC | Maumelle | AR | — | ◇ UNVERIFIED |
| MMMiller Machine, LLC | Denham Springs | LA | — | ◇ UNVERIFIED |
| MVMillville Volunteer Fire Dept. | Millville | CA | — | ◇ UNVERIFIED |
| MIMindbody, INC. | San Luis Obispo | CA | — | ◇ UNVERIFIED |
| MVMission View Health Center | San Luis Obispo | CA | — | ◇ UNVERIFIED |
| MHMit-Ka Holdings Corporation | Lake Havasu City | AZ | — | ◇ UNVERIFIED |
| MLMitsubishi Logisnext Americas | Marengo | IL | — | ◇ UNVERIFIED |
| MPMizpah Precision Mfg INC | Bemidji | MN | — | ◇ UNVERIFIED |
| MAMm Aeros Precision INC | Garden Grove | CA | — | ◇ UNVERIFIED |
| MAMobis Alabama | Montgomery | AL | — | ◇ UNVERIFIED |
| MAMoctezuma's Auto Dismantler | Stockton | CA | — | ◇ UNVERIFIED |
| MSModern Sailing School & Club | Sausalito | CA | — | ◇ UNVERIFIED |
