| MWMason West, INC | Placentia | CA | — | ◇ UNVERIFIED |
| MWMaspeth Welding, INC | New York | NY | — | ◇ UNVERIFIED |
| MIMasport Incorporated | Lincoln | NE | — | ◇ UNVERIFIED |
| MLMasses LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| MMMassey Metals INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MMMass Machine & Fabricating Company | Washington | PA | — | ◇ UNVERIFIED |
| MBMaster Bilt Products Site 2 | New Albany | MS | — | ◇ UNVERIFIED |
| MFMaster Fabrication LLC | Knoxville | IA | — | ◇ UNVERIFIED |
| MMMaster Magnetics, INC. | Castle Rock | CO | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal | New York | NY | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal, INC. | Schofield Barracks | HI | — | ◇ UNVERIFIED |
| MHMastic Home Exteriors, INC. | Sidney | OH | — | ◇ UNVERIFIED |
| MCMasto Contractor Services INC | Albuquerque | NM | — | ◇ UNVERIFIED |
| MMMatcor Metal Fabrication | Morton | IL | — | ◇ UNVERIFIED |
| MCMaterial Control | Croswell | MI | — | ◇ UNVERIFIED |
| MCMaterial Control INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| MCMaterial Control, INC. | Arlington | TX | — | ◇ UNVERIFIED |
| MCMaterial Control Systems, INC. | Cordova | IL | — | ◇ UNVERIFIED |
| MHMaterial Handling Technologies, INC. | North Syracuse | NY | — | ◇ UNVERIFIED |
| MHMaterial Handling Technology | Fair Haven | MI | — | ◇ UNVERIFIED |
| MTMaterials Technology INC | Somerset | NJ | — | ◇ UNVERIFIED |
| MSMaterial Supply INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MBMaterion Brush INC | Fremont | CA | — | ◇ UNVERIFIED |
| MHMat Holdings INC. Dba Midwest Air Technologies | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
 Matrix Machine and Repair INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMatrix Manufacturing, INC. | Springfield | MO | — | ◇ UNVERIFIED |
| MAMatsu Alabama, INC | Huntsville | AL | — | ◇ UNVERIFIED |
| MIMattessich Iron, LLC | Baldwinsville | NY | — | ◇ UNVERIFIED |
| MIMattessich Iron, LLC | Memphis | NY | — | ◇ UNVERIFIED |
| MBMatthews Blow Pipe CO INC | Memphis | TN | — | ◇ UNVERIFIED |
 Matthews International Corporation | San Jacinto | CA | — | ◇ UNVERIFIED |
| MMMatthews Manufacturing INC. | Saint Louis | MO | — | ◇ UNVERIFIED |
| MEMatzke Enterprises, INC. | Salem | WI | — | ◇ UNVERIFIED |
| MAMaumee Assembly & Stamping | Maumee | OH | — | ◇ UNVERIFIED |
| MBMaura Buildings, Incorporated | Lebanon | PA | — | ◇ UNVERIFIED |
| MMMaurice Mesple Dba Mesples Machine Shop and Pump | Fresno | CA | — | ◇ UNVERIFIED |
 Maverick Manufacturing LLC | Lakeville | MN | — | ◇ UNVERIFIED |
| MSMaverick Sheet Metal LLC | Conroe | TX | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MMMaxcor Manufacturing INC | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MLMaximus-3 LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
 Max Machining, LLC | Perkasie | PA | — | ◇ UNVERIFIED |
| MMMax Manufacturing INC | Bend | OR | — | ◇ UNVERIFIED |
| MEMayoni Enterprises | Pacoima | CA | — | ◇ UNVERIFIED |
| MSMay Specialty Fabricators, INC. | Register | GA | — | ◇ UNVERIFIED |
| MLMaysteel, LLC | Allenton | WI | — | ◇ UNVERIFIED |
| MPMaysteel Porters | Garland | TX | — | ◇ UNVERIFIED |
| MSMaysteel Star Precision | Longmont | CO | — | ◇ UNVERIFIED |
 Mayville Engineering Company INC Dba Mec | Vanderbilt | MI | — | ◇ UNVERIFIED |
| MWMazzella Welding & Fabrication INC | Wellsburg | WV | — | ◇ UNVERIFIED |
| MEMbm Enterprises, INC. | Pleasant Plains | AR | — | ◇ UNVERIFIED |
| MWMb Weld LLC | Waynesboro | VA | — | ◇ UNVERIFIED |
| MAMcabee Assembly Facility | Tuscaloosa | AL | — | ◇ UNVERIFIED |
| MWMcbrides Welding Dba American Iron | Ridgecrest | CA | — | ◇ UNVERIFIED |
| MSMcb Steel, INC. | Bessemer | AL | — | ◇ UNVERIFIED |
| MMMccabe Metal Products INC | Salem | OR | — | ◇ UNVERIFIED |
| MIMccampbell INC | Destrehan | LA | — | ◇ UNVERIFIED |
| MFMcconnie Fence CO. | Tampa | FL | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works LP | Murphy | NC | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works, L.p. | Orlando | FL | — | ◇ UNVERIFIED |
| MIMcdermott INC | Gibson | LA | — | ◇ UNVERIFIED |
| MIMcdermott INC - Morgan City Fabrication Facility - Amelia Yard | Amelia | LA | — | ◇ UNVERIFIED |
| MMMcdonough Marine Service | Metairie | LA | — | ◇ UNVERIFIED |
| MEMCEL Enterprises LLC | Thorntown | IN | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill INC | Monroe | LA | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Peachtree City | GA | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Merkel | TX | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill INC Dba Mcelroy Metal | Adelanto | CA | — | ◇ UNVERIFIED |
| MTMce Technologies INC | Seattle | WA | — | ◇ UNVERIFIED |
| MIMcfarlane, INC. | Grand Forks | ND | — | ◇ UNVERIFIED |
| MMMcfarlane Mfg CO | Sauk City | WI | — | ◇ UNVERIFIED |
| MAMcgill Airflow Corporation | Stockton | CA | — | ◇ UNVERIFIED |
| MAMcgill Air Flow LLC | Bennington | VT | — | ◇ UNVERIFIED |
| MIMcgill INC | Marengo | IL | — | ◇ UNVERIFIED |
| MIMcgregor Ind Inc/dunmore Plt | Dunmore | PA | — | ◇ UNVERIFIED |
| MPMcgregor Plant | Mc Gregor | TX | — | ◇ UNVERIFIED |
| MJMcguire Johns Holdings INC. | Elgin | IL | — | ◇ UNVERIFIED |
| MMMcintyre Manufacturing Group, INC. | Thomasville | NC | — | ◇ UNVERIFIED |
| MMMcintyre Metals | Thomasville | NC | — | ◇ UNVERIFIED |
| MCMcjunkin CORP | Princeton | WV | — | ◇ UNVERIFIED |
| MMMckinstry Metal Works INC. | Chicopee | MA | — | ◇ UNVERIFIED |
| MMMckinzey Metal Works, INC. | Lake Charles | LA | — | ◇ UNVERIFIED |
 Mclaughlin Body CO | East Moline | IL | — | ◇ UNVERIFIED |
| MWMcLaughlin Waste Equipment Inc. | Lockeford | CA | — | ◇ UNVERIFIED |
| MTMclendon Trailers, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MTMclendon Trailers, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MSMcManus Specialized Sheet Metal Works, Inc. | Milton | NY | — | ◇ UNVERIFIED |
| MCMcm Corporation of Oneida | Oneida | TN | — | ◇ UNVERIFIED |
| MFMcm Fabricators, INC. Dba Global Fabricators | Shafter | CA | — | ◇ UNVERIFIED |
| MFMcm Fixture Company, INC Dba Mcm Stainless Fabricating INC | Hazel Park | MI | — | ◇ UNVERIFIED |
| MSMcneely Steel & Supply | Leavenworth | KS | — | ◇ UNVERIFIED |
| MCMcnichols Company | Garland | TX | — | ◇ UNVERIFIED |
| MPMcNic Properties LLC | Middleton | ID | — | ◇ UNVERIFIED |
| MIMcpherson Implement, Incorporated | Norman | OK | — | ◇ UNVERIFIED |
| MIMcReynolds Investments LLC | Waterford | WI | — | ◇ UNVERIFIED |
| MEMcstowe Engineering | East Bridgewater | MA | — | ◇ UNVERIFIED |
| MIMct Industries - Bernalillo Plant | Bernalillo | NM | — | ◇ UNVERIFIED |
| MSMct Sheet Metal | Beaumont | TX | — | ◇ UNVERIFIED |
| MSMct Sheetmetal, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
