| MNMagnatron NC Pattern & Mfg, Inc. | Howell | MI | — | ◇ UNVERIFIED |
| MSMagnetic Sales & Manufacturing CO. INC | Tucson | AZ | — | ◇ UNVERIFIED |
| MSMagnetic Screw Machine Products, INC. | Marysville | OH | — | ◇ UNVERIFIED |
| MSMagnetic Specialties INC | Clackamas | OR | — | ◇ UNVERIFIED |
| MMMagnum Machine, INC. | Grand Junction | CO | — | ◇ UNVERIFIED |
| MMMagnum Magnetics | Caldwell | OH | — | ◇ UNVERIFIED |
| MMmagnum mold & engineering | Nixa | MO | — | ◇ UNVERIFIED |
| MSMagnum Steel Works, Inc | Mount Vernon | IL | — | ◇ UNVERIFIED |
| MMMagnus Metal INC | East Peoria | IL | — | ◇ UNVERIFIED |
| MAMagoo's Auto Parts | Hilo | HI | — | ◇ UNVERIFIED |
| MLMahaan LLC | Plain City | OH | — | ◇ UNVERIFIED |
| MLMainline LLC | Shelby Gap | KY | — | ◇ UNVERIFIED |
| MMMainline Machine, INC. | Lafayette | LA | — | ◇ UNVERIFIED |
| MMMain Machine INC | Concord | CA | — | ◇ UNVERIFIED |
| MSMain St. Machine & Repair LLC | Saint Paul | OR | — | ◇ UNVERIFIED |
| MMMainstream Manufacturing LLC | Beaumont | TX | — | ◇ UNVERIFIED |
| MSMain Street Machining LLC | Kersey | PA | — | ◇ UNVERIFIED |
| MMMajaskis Machine Shop INC | Royalton | MN | — | ◇ UNVERIFIED |
| MMMajor Maintenance & Repair Building N1 | Kodiak Base | AK | — | ◇ UNVERIFIED |
| MMMajor Metals, INC. | Houston | TX | — | ◇ UNVERIFIED |
| MCMajX CNC | Tempe | AZ | — | ◇ UNVERIFIED |
| MLMakjohn, L.L.C. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MIMallin Industries, LLC | Fairfield | AL | — | ◇ UNVERIFIED |
| MEMalmberg Engineeringna INC. | Livermore | CA | — | ◇ UNVERIFIED |
| MFMalm Fireplaces INC | Santa Rosa | CA | — | ◇ UNVERIFIED |
| MMalo | Tulsa | OK | — | ◇ UNVERIFIED |
| MLM & L Precision Machining, Inc. | Morgan Hill | CA | — | ◇ UNVERIFIED |
| MMManchester Metals | North Manchester | IN | — | ◇ UNVERIFIED |
| MDMan Diesel & Turbo North America, INC. | Prattville | AL | — | ◇ UNVERIFIED |
| MSMangels Sheet Metal, INC | Alexandria | LA | — | ◇ UNVERIFIED |
| MSManheim Specialty Machine, Incorporated | Manheim | PA | — | ◇ UNVERIFIED |
| MAManhole Adjusting Contractors | Monterey Park | CA | — | ◇ UNVERIFIED |
| MMManitou Manufacturing Company | White Bear Lake | MN | — | ◇ UNVERIFIED |
| MLManitowoc Lifts and Manufacturing, LLC | Dekalb | IL | — | ◇ UNVERIFIED |
| MEManiva Engineering | Miami Gardens | FL | — | ◇ UNVERIFIED |
| MManpower | Los Angeles | CA | — | ◇ UNVERIFIED |
| MAMansell and Associates, LLC | Tuscumbia | AL | — | ◇ UNVERIFIED |
| MFMansfield Foundry | Mansfield | MO | — | ◇ UNVERIFIED |
| MSManufacturing Services International LLC | Bessemer City | NC | — | ◇ UNVERIFIED |
| MTManufacturing Techniques INC | Ham Lake | MN | — | ◇ UNVERIFIED |
| MIManzke Investments, Inc. | Escondido | CA | — | ◇ UNVERIFIED |
| MEMape Engineering INC. | Colton | CA | — | ◇ UNVERIFIED |
| MPMapleton Properties LLC | Spanish Fork | UT | — | ◇ UNVERIFIED |
| MMMaplewood Machine | North Dartmouth | MA | — | ◇ UNVERIFIED |
| MEMarathon Equipment Company | Yerington | NV | — | ◇ UNVERIFIED |
| MMMarble Machine, INC. | Danville | IL | — | ◇ UNVERIFIED |
| MMMarcellus Metalcasters INC | Marcellus | MI | — | ◇ UNVERIFIED |
| MHMarc Holt | San Diego | CA | — | ◇ UNVERIFIED |
| MMMarco Machine LLC | Morgantown | WV | — | ◇ UNVERIFIED |
| MMMarco Manufacturing CO. | Akron | OH | — | ◇ UNVERIFIED |
| MMMarietta Magnetics LLC | Marietta | OH | — | ◇ UNVERIFIED |
| MMMari Manufacturing & Engineering, INC. | West Chicago | IL | — | ◇ UNVERIFIED |
| MAMarin Airporter | San Rafael | CA | — | ◇ UNVERIFIED |
| MEMarine Equipment Supply LLC | Chula Vista | CA | — | ◇ UNVERIFIED |
| MPMarine Parts House | San Dimas | CA | — | ◇ UNVERIFIED |
| MMMarkco Machine Works INC. | Odessa | TX | — | ◇ UNVERIFIED |
| MEMark E. Callaghan and Stacie L. Callaghan | Lincoln | CA | — | ◇ UNVERIFIED |
| MSMarking Specialists/Polymer Technologies | Buffalo Grove | IL | — | ◇ UNVERIFIED |
 Markins Enterprise, LLC | Apache Junction | AZ | — | ◇ UNVERIFIED |
| MMMark Manufacturing | Saint Paul | MN | — | ◇ UNVERIFIED |
| MPMark Peiser Manufacturing, Inc. | Tavares | FL | — | ◇ UNVERIFIED |
| MPMarlton Pike Precision | Cherry Hill | NJ | — | ◇ UNVERIFIED |
| MEMarmax Enterprises, Inc. | Richfield | WI | — | ◇ UNVERIFIED |
| MIMaro International Corporation | Tulsa | OK | — | ◇ UNVERIFIED |
| MMMaro Manufacturing, INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| MMMarquardt & Mueller Machining, INC | Woodstock | IL | — | ◇ UNVERIFIED |
| MLMarrick, LLC | Chesapeake | VA | — | ◇ UNVERIFIED |
| MRMarshall Ruby INC | Frostburg | MD | — | ◇ UNVERIFIED |
| MMMarshal Machinery INC | San Clemente | CA | — | ◇ UNVERIFIED |
| MPMar-tech Precision, LLC | Hackettstown | NJ | — | ◇ UNVERIFIED |
| MDMartell Design and Fabrication LLC | Saco | ME | — | ◇ UNVERIFIED |
| MMMartin Metal Fabricators INC | Salem | OR | — | ◇ UNVERIFIED |
| MMMartin Metalwork LLC | Berea | KY | — | ◇ UNVERIFIED |
| MHMarvel Holdings LLC | Orchard | TX | — | ◇ UNVERIFIED |
| MMMarvel Machining Enterprises LLC | Bensenville | IL | — | ◇ UNVERIFIED |
| MDMarx Digital Mfg, Inc | Las Vegas | NV | — | ◇ UNVERIFIED |
| MMMaryland Metals Processing, INC. | Sparrows Point | MD | — | ◇ UNVERIFIED |
| MLMascoat LLC | West Monroe | LA | — | ◇ UNVERIFIED |
| MIMas Iron CO | Los Angeles | CA | — | ◇ UNVERIFIED |
| MMMason Machine and Fab, LLC | Lafayette | LA | — | ◇ UNVERIFIED |
| MMMason Machinings INC | Morristown | TN | — | ◇ UNVERIFIED |
| MLMasonmarine.net LLC | San Dimas | CA | — | ◇ UNVERIFIED |
| MOMason & Overstreet Welding & Machine Works, INC. | Pearl | MS | — | ◇ UNVERIFIED |
| MIMasport Incorporated | Lincoln | NE | — | ◇ UNVERIFIED |
| MLMasses LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| MMMass. Machine, INC. | Westwood | MA | — | ◇ UNVERIFIED |
| MMMasteq Manufacturing, LLC | New Berlin | WI | — | ◇ UNVERIFIED |
| MMMastercraft Machine INC | West Valley City | UT | — | ◇ UNVERIFIED |
| MKMaster Kraft Tooling Corporation | Tulsa | OK | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Houston | TX | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Blaine | MN | — | ◇ UNVERIFIED |
| MMMaster Magnetics, INC. | Castle Rock | CO | — | ◇ UNVERIFIED |
| MMMaster Matic INC | Osseo | MN | — | ◇ UNVERIFIED |
| MPMaster Precision Mold Technologies | Greenville | MI | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal | New York | NY | — | ◇ UNVERIFIED |
 Masters Machine, LLC | Richmond | MI | — | ◇ UNVERIFIED |
| Masters Machine Shop INC | Mankato | MN | — | ◇ UNVERIFIED |
| MPMasters Precision Machining Inc. | Kent | OH | — | ◇ UNVERIFIED |
| MSMaster Swaging, INC. | Jackson Center | OH | — | ◇ UNVERIFIED |
| MCMaterial Control | Croswell | MI | — | ◇ UNVERIFIED |
