| MSM&b Steel Fabricators, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MMMcadams & Mcadams, INC. D/b/a M & M Welding | Archdale | NC | — | ◇ UNVERIFIED |
| MIMcclister INC | Tualatin | OR | — | ◇ UNVERIFIED |
| MLMcewen Lighting Studio | Berkeley | CA | — | ◇ UNVERIFIED |
| MSMcmahno Steel CO | Chula Vista | CA | — | ◇ UNVERIFIED |
| MMMcswain Metal Fabrication, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| MSMcwhirter Steel | Lancaster | CA | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MMMeiers Modern Metals, LLC | Portland | OR | — | ◇ 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 |
| 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 |
| MCMerrimack County Customs, LLC. | Bradford | NH | — | ◇ 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 |
| MCMetal Concepts Az LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| MCMetal Concepts LLC | Cypress | TX | — | ◇ UNVERIFIED |
| MIMetalfab, INC. | San Antonio | FL | — | ◇ UNVERIFIED |
| MIMetal Impressions INC | Sanford | NC | — | ◇ UNVERIFIED |
| MIMetal Industries-bushnell | Bushnell | FL | — | ◇ UNVERIFIED |
| MIMetal Innovations, Inc. | Chatsworth | CA | — | ◇ UNVERIFIED |
 Metal Machining Co., INC | Dorado | PR | — | ◇ UNVERIFIED |
| MMMetal Magic | Waynesboro | VA | — | ◇ UNVERIFIED |
| MAMetalWork Austin | Austin | TX | — | ◇ UNVERIFIED |
| MLMetalworks, LLC | Gainesville | GA | — | ◇ UNVERIFIED |
| MIMet Industries INC | Gardena | CA | — | ◇ UNVERIFIED |
| MCMetro Custom Iron Works LLC | Milwaukie | OR | — | ◇ UNVERIFIED |
| MMMetro Manufacturing INC | Saint Paul | MN | — | ◇ UNVERIFIED |
| MSMeyer Smith INC | Nashville | TN | — | ◇ UNVERIFIED |
| MMM.g. Mcgrath, INC. | Tucson | AZ | — | ◇ UNVERIFIED |
| MGM G Metal Creations INC | Riverside | CA | — | ◇ UNVERIFIED |
| MAMichael a Thomas and Renae Thomas, Individually and As Husband and Wife | Apache Junction | AZ | — | ◇ UNVERIFIED |
| MMMichael Mccann | Grants Pass | OR | — | ◇ UNVERIFIED |
| MTMichael Todd Mcmurray | Portland | OR | — | ◇ UNVERIFIED |
| MPMidland Precision Machining, INC | Chandler | AZ | — | ◇ UNVERIFIED |
| MAMidwest Air Technologies, INC. | Mesquite | TX | — | ◇ UNVERIFIED |
| MIMileon Investments LLC | Chatsworth | CA | — | ◇ UNVERIFIED |
| MMMillerbernd Manufacturing Company | Winsted | MN | — | ◇ UNVERIFIED |
| MCMiller's Custom Metals, INC. | Lake Worth | FL | — | ◇ UNVERIFIED |
 Minestone Construction | Hillsborough | NJ | — | ◇ UNVERIFIED |
| MBMiranda Bros Iron Works LLC | Oxnard | CA | — | ◇ UNVERIFIED |
