| MIMcdermott INC - Morgan City Fabrication Facility - Amelia Yard | Amelia | LA | — | ◇ UNVERIFIED |
| MMMcdonough Marine Service | Metairie | LA | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill INC | Monroe | LA | — | ◇ UNVERIFIED |
| MMMcelroy Metal Mill INC Dba Mcelroy Metal | Adelanto | CA | — | ◇ UNVERIFIED |
| MTMce Technologies INC | Seattle | WA | — | ◇ UNVERIFIED |
| MLMcewen Lighting Studio | Berkeley | CA | — | ◇ UNVERIFIED |
| MMMcfarlane Mfg CO | Sauk City | WI | — | ◇ UNVERIFIED |
| MIMcgregor Ind Inc/dunmore Plt | Dunmore | PA | — | ◇ UNVERIFIED |
 Mclaughlin Body CO | East Moline | IL | — | ◇ UNVERIFIED |
| MSMcmahno Steel CO | Chula Vista | CA | — | ◇ UNVERIFIED |
| MFMcm Fabricators, INC. Dba Global Fabricators | Shafter | CA | — | ◇ UNVERIFIED |
| MSMcneely Steel & Supply | Leavenworth | KS | — | ◇ UNVERIFIED |
| MCMcnichols Company | Garland | TX | — | ◇ UNVERIFIED |
| MIMcReynolds Investments LLC | Waterford | WI | — | ◇ UNVERIFIED |
| MMMcswain Metal Fabrication, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| MSMcwhirter Steel | Lancaster | CA | — | ◇ UNVERIFIED |
| MCMDI Corporation | Cheney | KS | — | ◇ UNVERIFIED |
| MCMDI Corporation | Cheney | KS | — | ◇ UNVERIFIED |
 Meadow-burke Products | Hazleton | PA | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MAMechanical and Industrial Steel Services, INC. | Channahon | IL | — | ◇ UNVERIFIED |
| MHMedway Hall Development Group, Inc. | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMeiers Modern Metals, LLC | Portland | OR | — | ◇ UNVERIFIED |
| MPMellies Products INC. | Morganville | KS | — | ◇ UNVERIFIED |
| MMMelrose Metal Products, INC | Fremont | CA | — | ◇ UNVERIFIED |
| MPMelting Point Welding & Fabrication, Inc. | Killingly | CT | — | ◇ UNVERIFIED |
| MBMelvin Baltodano | Ontario | CA | — | ◇ UNVERIFIED |
| MWMelvin Wrought Iron & Ornamental | Ontario | CA | — | ◇ UNVERIFIED |
| MSMemphis Sheet Metal Works INC | Memphis | TN | — | ◇ UNVERIFIED |
| MMMenard Manufacturing INC. | Dewitt | AR | — | ◇ UNVERIFIED |
| MMMenator Metal Works LLC | Winneconne | WI | — | ◇ UNVERIFIED |
| MSMendel Steel & Ornamental Iron Company | Bethel Park | PA | — | ◇ UNVERIFIED |
| MOMendoza's Ornamental Iron | Fullerton | CA | — | ◇ UNVERIFIED |
| MMMerchants Metals, LLC | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMerchant's Moving & Storage Corporation | Yoakum | TX | — | ◇ UNVERIFIED |
| MCMere Capital, LLC dba Czar Weld | House Springs | MO | — | ◇ UNVERIFIED |
| MSMeridian Specialty Vehicles | Las Vegas | NV | — | ◇ UNVERIFIED |
| MFMerrill Fab | Merrill | WI | — | ◇ UNVERIFIED |
| MSMerrill Steel Camanche | Camanche | IA | — | ◇ UNVERIFIED |
| MCMerrimack County Customs, LLC. | Bradford | NH | — | ◇ UNVERIFIED |
| MVMesilla Valley Metals | Las Cruces | NM | — | ◇ UNVERIFIED |
| MDMeta Designs, LLC | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MAMetal Air Ironworks, INC. | Chico | CA | — | ◇ UNVERIFIED |
| MAMetal Alliance Inc | Huntingdon Valley | PA | — | ◇ UNVERIFIED |
| MAMetal Arts Engravers INC | Shawnee | KS | — | ◇ UNVERIFIED |
| MBMetal Bending Corporation | Orange | CA | — | ◇ UNVERIFIED |
| MLMetalbuilt LLC | Macomb | MI | — | ◇ UNVERIFIED |
| MCMetal Concepts Az LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MCMetal Concepts LLC | Cypress | TX | — | ◇ UNVERIFIED |
| MIMetal-con, INC. | Sylvania | GA | — | ◇ UNVERIFIED |
| MCMetal Container Corporation | Oklahoma City | OK | — | ◇ UNVERIFIED |
| MDMetal Design Corporation | Madison | WI | — | ◇ UNVERIFIED |
| MEMetal Enterprises, INC. | Portland | OR | — | ◇ UNVERIFIED |
| MAMetalfab Arizona L.l.c. | Phoenix | AZ | — | ◇ UNVERIFIED |
| MIMetalfab INC | Richland | WA | — | ◇ UNVERIFIED |
| MIMetalfab INC | Kennewick | WA | — | ◇ UNVERIFIED |
| MIMetalfab, INC. | San Antonio | FL | — | ◇ UNVERIFIED |
| MFMetal Fabrication Technologies D/b/a Gerdau Ameris | Johnson City | TN | — | ◇ UNVERIFIED |
| MFMetal Fabricators, LLC | Tallahassee | FL | — | ◇ UNVERIFIED |
| MFMetal Fabricators of St Louis | Saint Louis | MO | — | ◇ UNVERIFIED |
| MFMetal for Electronics LLC | Memphis | TN | — | ◇ UNVERIFIED |
| MIMetal Impressions INC | Sanford | NC | — | ◇ UNVERIFIED |
| MIMetal Industries-bushnell | Bushnell | FL | — | ◇ UNVERIFIED |
| MIMetal Industries, INC | Crystal River | FL | — | ◇ UNVERIFIED |
| MIMetal Innovations, Inc. | Chatsworth | CA | — | ◇ UNVERIFIED |
| MKMetal Kings | Lynwood | CA | — | ◇ UNVERIFIED |
 Metal Machining Co., INC | Dorado | PR | — | ◇ UNVERIFIED |
| MMMetal Magic | Waynesboro | VA | — | ◇ UNVERIFIED |
| MMMetal Magic, LLC | Ocala | FL | — | ◇ UNVERIFIED |
 Metal Master LLC | Tacoma | WA | — | ◇ UNVERIFIED |
| MMMetal Masters, INC. | Mitchellville | IA | — | ◇ UNVERIFIED |
| MPMetal Parts Fabrication | Vidor | TX | — | ◇ UNVERIFIED |
| MPMetal Pros, LLC | Wichita | KS | — | ◇ UNVERIFIED |
| MSMetal Specialist, INC. | Austell | GA | — | ◇ UNVERIFIED |
| MPMetals & Plastics INC | Longwood | FL | — | ◇ UNVERIFIED |
| MUMetals USA | Fort Washington | PA | — | ◇ UNVERIFIED |
| MMetaltek | Lakeland | FL | — | ◇ UNVERIFIED |
| MIMetal-tek, INC. | Lakeland | FL | — | ◇ UNVERIFIED |
 Metal Trades:yonges Island | Yonges Island | SC | — | ◇ UNVERIFIED |
| MAMetalWork Austin | Austin | TX | — | ◇ UNVERIFIED |
| MWMetal Works Corporation | Baton Rouge | LA | — | ◇ UNVERIFIED |
| MWMetal Works INC | Lexington | SC | — | ◇ UNVERIFIED |
| MLMetalworks, LLC | Gainesville | GA | — | ◇ UNVERIFIED |
| MWMetal Works Performance, Inc | Saint Charles | IL | — | ◇ UNVERIFIED |
| MMetco | Hartselle | AL | — | ◇ UNVERIFIED |
| MIMet Industries INC | Gardena | CA | — | ◇ UNVERIFIED |
| MCMetro Custom Iron Works LLC | Milwaukie | OR | — | ◇ UNVERIFIED |
| MMMetro Manufacturing INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| MCMetroplex Conveyor & Services, LLC | Quinlan | TX | — | ◇ UNVERIFIED |
| MFMetroplex Fabrication and Erection, LLP | Azle | TX | — | ◇ UNVERIFIED |
| MSMetropolitan Steel I/steelco | Sinking Spring | PA | — | ◇ UNVERIFIED |
| MSMetro Steel | Spring Valley | CA | — | ◇ UNVERIFIED |
| MMMetso Minerals | Milwaukee | WI | — | ◇ UNVERIFIED |
| MBMetwood Building Solutions | Boones Mill | VA | — | ◇ UNVERIFIED |
| MCMexico City Iron Works | San Francisco | CA | — | ◇ UNVERIFIED |
| MCMeyers Construction INC | Madera | CA | — | ◇ UNVERIFIED |
| MSMeyer Smith INC | Nashville | TN | — | ◇ UNVERIFIED |
 Meyer Utility Structures, LLC Plant No. 1663 | Hager City | WI | — | ◇ UNVERIFIED |
| MCMgk/homer City | Homer City | PA | — | ◇ UNVERIFIED |
