| MMMarietta Magnetics LLC | Marietta | OH | — | ◇ UNVERIFIED |
| MSMarina Security Gate, INC. | Gardena | CA | — | ◇ UNVERIFIED |
| MSMarking Specialists/Polymer Technologies | Buffalo Grove | IL | — | ◇ UNVERIFIED |
 Markins Enterprise, LLC | Apache Junction | AZ | — | ◇ UNVERIFIED |
| MPMark Peiser Manufacturing, Inc. | Tavares | FL | — | ◇ UNVERIFIED |
| MDMarks Design & Metalworks | Vancouver | WA | — | ◇ UNVERIFIED |
| MVMark Vii Equipment Incorporated | Arvada | CO | — | ◇ UNVERIFIED |
| MIMaro International Corporation | Tulsa | OK | — | ◇ UNVERIFIED |
| MLMarrick, LLC | Chesapeake | VA | — | ◇ UNVERIFIED |
| MPMar-tech Precision, LLC | Hackettstown | NJ | — | ◇ UNVERIFIED |
| MDMartell Design and Fabrication LLC | Saco | ME | — | ◇ UNVERIFIED |
| MIMarti, Inc. | Bemidji | MN | — | ◇ UNVERIFIED |
| MMMartin Metal Fabricators INC | Salem | OR | — | ◇ UNVERIFIED |
| MMMartin Metalwork LLC | Berea | KY | — | ◇ UNVERIFIED |
| MHMarvel Holdings LLC | Orchard | TX | — | ◇ UNVERIFIED |
| MMMaryland Metals Processing, INC. | Sparrows Point | MD | — | ◇ UNVERIFIED |
| MSMaryland Structural Fabricators INC | Millington | MD | — | ◇ UNVERIFIED |
| MLMascoat LLC | West Monroe | LA | — | ◇ UNVERIFIED |
| MHMascotte Home Security Products INC | Portland | OR | — | ◇ UNVERIFIED |
| MMMason Machine and Fab, LLC | Lafayette | LA | — | ◇ UNVERIFIED |
| MIMasport Incorporated | Lincoln | NE | — | ◇ UNVERIFIED |
| MLMasses LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| MMMaster Magnetics, INC. | Castle Rock | CO | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal | New York | NY | — | ◇ UNVERIFIED |
| MCMaterial Control | Croswell | MI | — | ◇ UNVERIFIED |
| MCMaterial Control INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| MCMaterial Control, INC. | Arlington | TX | — | ◇ UNVERIFIED |
| MRMaterial Resources INC | Forest Grove | OR | — | ◇ UNVERIFIED |
| MTMaterials Technology INC | Somerset | NJ | — | ◇ UNVERIFIED |
| MBMaterion Brush INC | Fremont | CA | — | ◇ UNVERIFIED |
| MHMat Holdings INC. Dba Midwest Air Technologies | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
 Matrix Machine and Repair INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| MMMatrix Manufacturing, INC. | Springfield | MO | — | ◇ UNVERIFIED |
| MAMatsu Alabama, INC | Huntsville | AL | — | ◇ UNVERIFIED |
| MIMattei, INC. | Harlingen | TX | — | ◇ UNVERIFIED |
| MBMatthew Bronze West Annex Facility | Kingwood | WV | — | ◇ UNVERIFIED |
 Matthews International Corporation | San Jacinto | CA | — | ◇ UNVERIFIED |
| Matthews International Corporation | Kingwood | WV | — | ◇ UNVERIFIED |
| MMMatthews Manufacturing INC. | Saint Louis | MO | — | ◇ UNVERIFIED |
| MEMatzke Enterprises, INC. | Salem | WI | — | ◇ UNVERIFIED |
| MAMaumee Assembly & Stamping | Maumee | OH | — | ◇ UNVERIFIED |
 Maverick Manufacturing LLC | Lakeville | MN | — | ◇ UNVERIFIED |
| MIMaxanns INC | Greeley | CO | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MMMaxcor Manufacturing INC | Colorado Springs | CO | — | ◇ UNVERIFIED |
| MLMaximus-3 LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
 Max Machining, LLC | Perkasie | PA | — | ◇ UNVERIFIED |
| MMMax Manufacturing INC | Bend | OR | — | ◇ UNVERIFIED |
| MPMaysteel Porters | Garland | TX | — | ◇ UNVERIFIED |
| MSM&b Steel Fabricators, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MWMb Weld LLC | Waynesboro | VA | — | ◇ UNVERIFIED |
| MMMcadams & Mcadams, INC. D/b/a M & M Welding | Archdale | NC | — | ◇ UNVERIFIED |
| MIMccampbell INC | Destrehan | LA | — | ◇ UNVERIFIED |
| MIMcclister INC | Tualatin | OR | — | ◇ UNVERIFIED |
| MFMcconnie Fence CO. | Tampa | FL | — | ◇ UNVERIFIED |
| MEMCEL Enterprises LLC | Thorntown | IN | — | ◇ UNVERIFIED |
| MLMcewen Lighting Studio | Berkeley | CA | — | ◇ UNVERIFIED |
| MIMcgill INC | Marengo | IL | — | ◇ UNVERIFIED |
| MPMcgregor Plant | Mc Gregor | TX | — | ◇ UNVERIFIED |
| MMMcintyre Manufacturing Group, INC. | Thomasville | NC | — | ◇ UNVERIFIED |
| MMMcintyre Metals | Thomasville | NC | — | ◇ UNVERIFIED |
| MLMckc, LLC | Sandwich | IL | — | ◇ UNVERIFIED |
| MWMcLaughlin Waste Equipment Inc. | Lockeford | CA | — | ◇ UNVERIFIED |
| MEMclellan Equipment INC | Hanford | CA | — | ◇ UNVERIFIED |
| MTMclendon Trailers, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MTMclendon Trailers, LLC | Phenix City | AL | — | ◇ UNVERIFIED |
| MSMcmahno Steel CO | Chula Vista | CA | — | ◇ UNVERIFIED |
| MCMcm Corporation of Oneida | Oneida | TN | — | ◇ UNVERIFIED |
| MPMcNic Properties LLC | Middleton | ID | — | ◇ UNVERIFIED |
| MIMcpherson Implement, Incorporated | Norman | OK | — | ◇ UNVERIFIED |
| MEMcstowe Engineering | East Bridgewater | MA | — | ◇ UNVERIFIED |
| MMMcswain Metal Fabrication, INC. | Englewood | CO | — | ◇ UNVERIFIED |
| MIMct Industries - Bernalillo Plant | Bernalillo | NM | — | ◇ UNVERIFIED |
| MSMcwhirter Steel | Lancaster | CA | — | ◇ UNVERIFIED |
| MMMd Machine INC | Rogers | MN | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MGMec General Construction INC. | Brooklyn | NY | — | ◇ UNVERIFIED |
| MIMec INC. | Wayland | MI | — | ◇ UNVERIFIED |
| MIMec INC. | Atkins | VA | — | ◇ UNVERIFIED |
| MIMec INC. | Byron Center | MI | — | ◇ UNVERIFIED |
| MMMedalist Mfg. INC. | Pella | IA | — | ◇ UNVERIFIED |
| MBMedia Blast & Abrasives INC | Brea | CA | — | ◇ UNVERIFIED |
| MMMedieval Metalwerx, LLC | Mayer | MN | — | ◇ UNVERIFIED |
| MFMedway Flower LLC | Medway | MA | — | ◇ UNVERIFIED |
| MMMeiers Modern Metals, LLC | Portland | OR | — | ◇ UNVERIFIED |
| MIMel-co-ed INC. | Pawtucket | RI | — | ◇ UNVERIFIED |
| MMMeldrum Mechanical Services, INC. | Toledo | OH | — | ◇ UNVERIFIED |
| MMMelfred Manufacturing Company, INC. | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MEMellinger Engineering Group, LLC | Sonoma | CA | — | ◇ UNVERIFIED |
| M2Mello 212 LLC | Northlake | TX | — | ◇ 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 |
| MCMemphis Can Company* | Memphis | TN | — | ◇ UNVERIFIED |
| MSMendel Steel & Ornamental Iron Company | Bethel Park | PA | — | ◇ UNVERIFIED |
| MOMendoza's Ornamental Iron | Fullerton | CA | — | ◇ UNVERIFIED |
| MOMen of Steel Enterprises, LLC | Bensalem | PA | — | ◇ UNVERIFIED |
| MMMerchants Metals, LLC | Jacksonville | FL | — | ◇ UNVERIFIED |
