| MMMarcres Manufacturing, INC. Dba Macres Metal Works | Mount Prospect | IL | — | ◇ UNVERIFIED |
| MIMarelco, INC. and Its Successors and Assigns | Beltsville | MD | — | ◇ UNVERIFIED |
| MMMarelich Mechanical Co, INC | Hayward | CA | — | ◇ UNVERIFIED |
| MMarino/ware | Pasadena | TX | — | ◇ UNVERIFIED |
| MMMarksman Metal Company INC | Saint Michael | MN | — | ◇ UNVERIFIED |
| MFMarlatt Fabricators INC. | Sandia | TX | — | ◇ UNVERIFIED |
| MIMarstan INC | Coon Rapids | MN | — | ◇ UNVERIFIED |
| MSMartin Sheet Metal, INC. | Amarillo | TX | — | ◇ UNVERIFIED |
| MCMason Corporation | Jemison | AL | — | ◇ UNVERIFIED |
| MMMassey Metals INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MBMaster Bilt Products Site 2 | New Albany | MS | — | ◇ UNVERIFIED |
| MFMaster Fabrication LLC | Knoxville | IA | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal, INC. | Schofield Barracks | HI | — | ◇ UNVERIFIED |
| MHMastic Home Exteriors, INC. | Sidney | OH | — | ◇ UNVERIFIED |
| MCMasto Contractor Services INC | Albuquerque | NM | — | ◇ UNVERIFIED |
| MHMaterial Handling Technology | Fair Haven | MI | — | ◇ UNVERIFIED |
| MSMaterial Supply INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MBMatthews Blow Pipe CO INC | Memphis | TN | — | ◇ UNVERIFIED |
| MSMaverick Sheet Metal LLC | Conroe | TX | — | ◇ UNVERIFIED |
| MEMayoni Enterprises | Pacoima | CA | — | ◇ UNVERIFIED |
| MLMaysteel, LLC | Allenton | WI | — | ◇ UNVERIFIED |
| MSMaysteel Star Precision | Longmont | CO | — | ◇ UNVERIFIED |
| MMMccabe Metal Products INC | Salem | OR | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works LP | Murphy | NC | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works, L.p. | Orlando | FL | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Merkel | TX | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Peachtree City | GA | — | ◇ UNVERIFIED |
| MIMcfarlane, INC. | Grand Forks | ND | — | ◇ UNVERIFIED |
| MAMcgill Airflow Corporation | Stockton | CA | — | ◇ UNVERIFIED |
| MAMcgill Air Flow LLC | Bennington | VT | — | ◇ UNVERIFIED |
| MJMcguire Johns Holdings INC. | Elgin | IL | — | ◇ UNVERIFIED |
| MMMckinstry Metal Works INC. | Chicopee | MA | — | ◇ UNVERIFIED |
| MMMckinzey Metal Works, INC. | Lake Charles | LA | — | ◇ UNVERIFIED |
| MSMcManus Specialized Sheet Metal Works, Inc. | Milton | NY | — | ◇ UNVERIFIED |
| MFMcm Fixture Company, INC Dba Mcm Stainless Fabricating INC | Hazel Park | MI | — | ◇ UNVERIFIED |
| MSMct Sheet Metal | Beaumont | TX | — | ◇ UNVERIFIED |
| MSMct Sheetmetal, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| MHMddh Holdings, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MMMeade Metals, Inc. | Elizabethtown | KY | — | ◇ UNVERIFIED |
| MOMech One, INC. | San Diego | CA | — | ◇ UNVERIFIED |
| MMMeeks Metal Works INC | Portland | OR | — | ◇ UNVERIFIED |
| MMMega Mechanical Services, LLC | Glastonbury | CT | — | ◇ UNVERIFIED |
| MCMel Cor Sheet Metal, INC | Lyons | IL | — | ◇ UNVERIFIED |
| M1Merchant 1 Manufacturing LLC | Reidsville | NC | — | ◇ UNVERIFIED |
| MMMercury Metals | Watsonville | CA | — | ◇ UNVERIFIED |
| MMMercury Metalworks, LLC | Washington | PA | — | ◇ UNVERIFIED |
| MMMercury Minnesota INC | Faribault | MN | — | ◇ UNVERIFIED |
| MEMeribel Enterprises LLC Dba Atlas Manufacturing | Minneapolis | MN | — | ◇ UNVERIFIED |
| MIMestek INC | Florence | KY | — | ◇ UNVERIFIED |
| MIMestek, Incorporated | Wyalusing | PA | — | ◇ UNVERIFIED |
