| 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 |
| MBMc Building Services, LLC | Celveland | OH | — | ◇ UNVERIFIED |
| MMMccabe Metal Products INC | Salem | OR | — | ◇ UNVERIFIED |
| MSMcCALL SADDLE COMPANY, INC. | Vernal | UT | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works LP | Murphy | NC | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works, L.p. | Orlando | FL | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Peachtree City | GA | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill, INC. | Merkel | TX | — | ◇ 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 |
| MFMeta Fab | Hillsboro | OR | — | ◇ UNVERIFIED |
| MAMetal Air Products, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MBMetal Benders, INC. | Hope Hull | AL | — | ◇ UNVERIFIED |
| MCMetal Components INC | Wyoming | MI | — | ◇ UNVERIFIED |
| MCMetal Craft Engineering | Fenwick | WV | — | ◇ UNVERIFIED |
| MCMetal Culverts INC | Oakland | MN | — | ◇ UNVERIFIED |
 Metal Culverts INC. | Jefferson City | MO | — | ◇ UNVERIFIED |
| MIMetal-era, INC. | Waukesha | WI | — | ◇ UNVERIFIED |
| MFMetal Force, INC. | Roy | UT | — | ◇ UNVERIFIED |
| MLMetal Line Fabrication, INC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MCMetal-link CORP. | Fond Du Lac | WI | — | ◇ UNVERIFIED |
| MMMetal Masters of North Florida INC | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMetal Merchants of Michigan INC | Rochester Hills | MI | — | ◇ UNVERIFIED |
| MIMetalogic Industries LLC | Dudley | MA | — | ◇ UNVERIFIED |
| MPMetal Panels INC. | Kansas City | KS | — | ◇ UNVERIFIED |
| MPMetal Plus LLC | Grand Rapids | MI | — | ◇ UNVERIFIED |
 Metal Products Co, Lc | Marianna | FL | — | ◇ UNVERIFIED |
| MIMetalrite, INC. | Richardson | TX | — | ◇ UNVERIFIED |
| MRMetal Roofing Solutions LLC | Wheat Ridge | CO | — | ◇ UNVERIFIED |
| MSMetal Sales Manufacturing Corporation | Otsego | MN | — | ◇ UNVERIFIED |
| MSMetal Sales Manufacturing Corporation | New Albany | IN | — | ◇ UNVERIFIED |
| MSMetal Sales Manufacturing Corporation | Detroit Lakes | MN | — | ◇ UNVERIFIED |
| MSMetal Sales Mfg CORP | Independence | MO | — | ◇ UNVERIFIED |
| MSMetal Service of Temple, INC. | Temple | PA | — | ◇ UNVERIFIED |
| MIMetalspand INC. | Waurika | OK | — | ◇ UNVERIFIED |
| MSMetal Specialties CO | San Leandro | CA | — | ◇ UNVERIFIED |
| MIMetal-tech, INC. | Las Cruces | NM | — | ◇ UNVERIFIED |
| MIMetaltech Industries INC | Longmont | CO | — | ◇ UNVERIFIED |
| MTMetal Tronics LLC | Georgetown | MA | — | ◇ UNVERIFIED |
| MHMetalworks Hawaii LLC | Honolulu | HI | — | ◇ UNVERIFIED |
| MWMetal Works INC. | Londonderry | NH | — | ◇ UNVERIFIED |
| MFMet Fab International, INC. | Waynesboro | VA | — | ◇ UNVERIFIED |
| MLMetkote Laminated Prod/taylor Plt | Taylor | PA | — | ◇ UNVERIFIED |
| MIMet-l-fab INC | Londonderry | NH | — | ◇ UNVERIFIED |
| MIMetl-fab, INC. | Omaha | NE | — | ◇ UNVERIFIED |
| MMMetro Metal Supply, INC. | Denver | CO | — | ◇ UNVERIFIED |
| MSMetroplex Sheet Metal II LLC | Garland | TX | — | ◇ UNVERIFIED |
| MTMetro Test and Balance, INC. | Capitol Heights | MD | — | ◇ UNVERIFIED |
| MHMexico Heating Co., INC. | Mexico | MO | — | ◇ UNVERIFIED |
| MRMfg. Resources, INC. | Rochester | NY | — | ◇ UNVERIFIED |
| MDM&g Duravent, INC. | Albany | NY | — | ◇ UNVERIFIED |
| MHM & H Metal Specialties INC | Irving | TX | — | ◇ UNVERIFIED |
| MHM & H Metal Specialties, INC. | Dallas | TX | — | ◇ UNVERIFIED |
| MHMiba Hydramechanica Corporation | Sterling Hts | MI | — | ◇ UNVERIFIED |
| MAMichael A. Melton (EPC) | Shelby | NC | — | ◇ UNVERIFIED |
| MMMicra Manufacturing | Hugo | MN | — | ◇ UNVERIFIED |
| MMMicro Metals | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MAMid America Precision Products | Stella | MO | — | ◇ UNVERIFIED |
| MLMidget Louver | Milford | CT | — | ◇ UNVERIFIED |
| MMMid-ohio Mechanical, INC. | Columbus | OH | — | ◇ UNVERIFIED |
| MSMid State Fabricating INC | Blaine | MN | — | ◇ UNVERIFIED |
| MAMidwest Awnings, INC. | Cameron | IL | — | ◇ UNVERIFIED |
 Midwest Fabrication & Supply LLC Dba Superior Air | Zumbrota | MN | — | ◇ UNVERIFIED |
| MIMidwest Industrial Metals | Northlake | IL | — | ◇ UNVERIFIED |
