| MAMcgill Airflow Corporation | Stockton | CA | — | ◇ UNVERIFIED |
| MMMcgill Maintenance Partnership, Lt | Freeport | TX | — | ◇ UNVERIFIED |
| MMMcgregor Manufacturing Company | Ozark | MO | — | ◇ UNVERIFIED |
| MIMcguire INC. | Gnadenhutten | OH | — | ◇ UNVERIFIED |
| MJMcguire Johns Holdings INC. | Elgin | IL | — | ◇ UNVERIFIED |
| MLMckc, LLC | Sandwich | IL | — | ◇ UNVERIFIED |
| MMMckenney Machine & Tool Company | Corinna | ME | — | ◇ UNVERIFIED |
| MMMckinzey Metal Works, INC. | Lake Charles | LA | — | ◇ UNVERIFIED |
| MSMcmahno Steel CO | Chula Vista | CA | — | ◇ UNVERIFIED |
| MIMcmanus Instrument Co., INC. | Village Mills | TX | — | ◇ UNVERIFIED |
| MSMcManus Specialized Sheet Metal Works, Inc. | Milton | NY | — | ◇ UNVERIFIED |
| MFMcm Fixture Company, INC Dba Mcm Stainless Fabricating INC | Hazel Park | MI | — | ◇ UNVERIFIED |
| MMMcmillan Machine Co., INC. | Phoenix | AZ | — | ◇ UNVERIFIED |
| MPM&c Precision Machining INC | Hawthorne | CA | — | ◇ UNVERIFIED |
| MMMcr Manufactured Component Resource LLC | Isanti | MN | — | ◇ UNVERIFIED |
| MSMct Sheet Metal | Beaumont | TX | — | ◇ UNVERIFIED |
| MSMct Sheetmetal, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| MSMcwhirter Steel | Lancaster | CA | — | ◇ UNVERIFIED |
| MHMddh Holdings, LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MIMdf Ind. INC. | Salina | KS | — | ◇ UNVERIFIED |
| MDM & D Machine Company | Linthicum | MD | — | ◇ UNVERIFIED |
| MDM - D Machining | Truman | MN | — | ◇ UNVERIFIED |
| MPM&D Precision Machining, Inc. | Garden Grove | CA | — | ◇ UNVERIFIED |
| MMMeade Metals, Inc. | Elizabethtown | KY | — | ◇ UNVERIFIED |
| MSMeaden Screw Products CO | Burr Ridge | IL | — | ◇ UNVERIFIED |
| MMMeadow Manufacturing, Inc. | Berlin | CT | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MDMechanical Designs of Virginia | Stuart | VA | — | ◇ UNVERIFIED |
| MRMechanical Repair & Engineering, L.p. | La Porte | TX | — | ◇ UNVERIFIED |
| MCMechanovent Corporation Dba the New York Blower Company | Effingham | IL | — | ◇ UNVERIFIED |
| MOMech One, INC. | San Diego | CA | — | ◇ UNVERIFIED |
| MMMechura Machine Works, LLC | Victoria | TX | — | ◇ UNVERIFIED |
| MIMecpro INC | Santa Clara | CA | — | ◇ UNVERIFIED |
| MMMedley Machine Shop INC. | Medley | FL | — | ◇ UNVERIFIED |
| MIMedplast INC. | West Berlin | NJ | — | ◇ UNVERIFIED |
| MTMedway Tool Machining, LLC | Troy | OH | — | ◇ UNVERIFIED |
| MMMeeks Metal Works INC | Portland | OR | — | ◇ UNVERIFIED |
| MMMega Mechanical Services, LLC | Glastonbury | CT | — | ◇ UNVERIFIED |
| MTMega Tool & Mfg CORP | Elmira | NY | — | ◇ UNVERIFIED |
| MMMeiers Modern Metals, LLC | Portland | OR | — | ◇ UNVERIFIED |
| MLMelAnna LLC | Cambridge | MN | — | ◇ UNVERIFIED |
| MCMel Cor Sheet Metal, INC | Lyons | IL | — | ◇ UNVERIFIED |
| MMMelissa M Riley | Portland | OR | — | ◇ UNVERIFIED |
| MPMelting Point Welding & Fabrication, Inc. | Killingly | CT | — | ◇ UNVERIFIED |
| MBMelvin Baltodano | Ontario | CA | — | ◇ UNVERIFIED |
| MWMelvin Wrought Iron & Ornamental | Ontario | CA | — | ◇ UNVERIFIED |
| MLMenco, LLC | Wausaukee | WI | — | ◇ UNVERIFIED |
| MSMendel Steel & Ornamental Iron Company | Bethel Park | PA | — | ◇ UNVERIFIED |
| MTMendeola Transaxles INC | San Diego | CA | — | ◇ UNVERIFIED |
| MOMendoza's Ornamental Iron | Fullerton | CA | — | ◇ UNVERIFIED |
| MFMercer Forge Corporation | Wheatland | PA | — | ◇ UNVERIFIED |
| MMMercer Machine and Tool LLC | Hamilton | NJ | — | ◇ UNVERIFIED |
| M1Merchant 1 Manufacturing LLC | Reidsville | NC | — | ◇ UNVERIFIED |
| MMMerchant Mfg INC | Maple Grove | MN | — | ◇ UNVERIFIED |
| MMMerchants Metals, LLC | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMerchant's Moving & Storage Corporation | Yoakum | TX | — | ◇ 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 |
| MTMeritt Tool & Die | Vermontville | MI | — | ◇ UNVERIFIED |
| MTMeriwether Tool | Fort Wayne | IN | — | ◇ UNVERIFIED |
| MMMerrick Machine CO | Alda | NE | — | ◇ UNVERIFIED |
| MCMerrimack County Customs, LLC. | Bradford | NH | — | ◇ UNVERIFIED |
| MTMerritt Tool & Manufacturing, INC. | Sussex | WI | — | ◇ UNVERIFIED |
| MPMeschkat Precision Machining INC | Valencia | CA | — | ◇ UNVERIFIED |
| MIMestek INC | Florence | KY | — | ◇ UNVERIFIED |
| MIMestek, Incorporated | Wyalusing | PA | — | ◇ UNVERIFIED |
| MDMeta Designs, LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MFMeta Fab | Hillsboro | OR | — | ◇ UNVERIFIED |
| MAMetal Air Ironworks, INC. | Chico | CA | — | ◇ UNVERIFIED |
| MAMetal Air Products, INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MAMetal Alliance Inc | Huntingdon Valley | PA | — | ◇ UNVERIFIED |
| MAMetal Arc INC | Muskegon | MI | — | ◇ UNVERIFIED |
| MAMetal Arts Engravers INC | Shawnee | KS | — | ◇ UNVERIFIED |
| MBMetal Benders, INC. | Hope Hull | AL | — | ◇ UNVERIFIED |
| MBMetal Bending Corporation | Orange | CA | — | ◇ UNVERIFIED |
| MCMetal Concepts Az LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MCMetal Concepts LLC | Cypress | TX | — | ◇ UNVERIFIED |
| MEMetalcraft Enterprises | Decatur | IN | — | ◇ UNVERIFIED |
| MFMetalcraft Fabrication INC | Portland | OR | — | ◇ UNVERIFIED |
| MMMetalcraft Machining | Southbridge | MA | — | ◇ UNVERIFIED |
| MCMetal Culverts INC | Oakland | MN | — | ◇ UNVERIFIED |
 Metal Culverts INC. | Jefferson City | MO | — | ◇ UNVERIFIED |
| MIMetal-era, INC. | Waukesha | WI | — | ◇ UNVERIFIED |
| MIMetalfab, INC. | San Antonio | FL | — | ◇ UNVERIFIED |
| MFMetal Fab Products, Inc. | Odessa | TX | — | ◇ UNVERIFIED |
| MFMetal Force, INC. | Roy | UT | — | ◇ UNVERIFIED |
| MIMetal Impressions INC | Sanford | NC | — | ◇ UNVERIFIED |
| MIMetal Innovations, Inc. | Chatsworth | CA | — | ◇ UNVERIFIED |
| MCMetalite Corporation | Fort Worth | TX | — | ◇ UNVERIFIED |
| MLMetal Line CORP | Manistee | MI | — | ◇ UNVERIFIED |
| MLMetal Line Fabrication, INC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MCMetal-link CORP. | Fond Du Lac | WI | — | ◇ UNVERIFIED |
| MMMetal & Machinery, INC. | La Fayette | GA | — | ◇ UNVERIFIED |
 Metal Machining Co., INC | Dorado | PR | — | ◇ UNVERIFIED |
| MMMetal Magic | Waynesboro | VA | — | ◇ UNVERIFIED |
| MMMetal Merchants of Michigan INC | Rochester Hills | MI | — | ◇ UNVERIFIED |
| MIMetalogic Industries LLC | Dudley | MA | — | ◇ UNVERIFIED |
