| MLManitowoc Lifts and Manufacturing, LLC | Dekalb | IL | — | ◇ UNVERIFIED |
| MEManiva Engineering | Miami Gardens | FL | — | ◇ UNVERIFIED |
| MWMansfield Welding Services LLC | Oakwood | OH | — | ◇ UNVERIFIED |
| MMMantis Metalcraft LLC | Columbus | OH | — | ◇ UNVERIFIED |
| MLManufab, LLC | Rexburg | ID | — | ◇ UNVERIFIED |
| MCManufacturing Consulting Services | Sulphur Springs | TX | — | ◇ UNVERIFIED |
| MTManufacturing Techniques INC | Ham Lake | MN | — | ◇ UNVERIFIED |
| MIManzke Investments, Inc. | Escondido | CA | — | ◇ UNVERIFIED |
| MMMaplewood Machine | North Dartmouth | MA | — | ◇ UNVERIFIED |
| MLMap LLC | Franklin | IN | — | ◇ UNVERIFIED |
| MIMarano Ironworks, INC. | Norristown | PA | — | ◇ UNVERIFIED |
| MMMarble Machine, INC. | Danville | IL | — | ◇ UNVERIFIED |
| MHMarc Holt | San Diego | CA | — | ◇ UNVERIFIED |
| MMMarco Machine LLC | Morgantown | WV | — | ◇ UNVERIFIED |
| MMMarco Manufacturing CO. | Akron | OH | — | ◇ UNVERIFIED |
| MMMarcres Manufacturing, INC. Dba Macres Metal Works | Mount Prospect | IL | — | ◇ UNVERIFIED |
| MIMarelco, INC. and Its Successors and Assigns | Beltsville | MD | — | ◇ UNVERIFIED |
| MMMarelich Mechanical Co, INC | Hayward | CA | — | ◇ UNVERIFIED |
| MMMari Manufacturing & Engineering, INC. | West Chicago | IL | — | ◇ UNVERIFIED |
| MSMarina Security Gate, INC. | Gardena | CA | — | ◇ UNVERIFIED |
| MEMarine Equipment Supply LLC | Chula Vista | CA | — | ◇ UNVERIFIED |
| MPMarine Parts House | San Dimas | CA | — | ◇ UNVERIFIED |
| MMarino/ware | Pasadena | TX | — | ◇ UNVERIFIED |
| MMMarkco Machine Works INC. | Odessa | TX | — | ◇ UNVERIFIED |
| MKMark Knoedler | Ijamsville | MD | — | ◇ UNVERIFIED |
| MMMark Manufacturing | Saint Paul | MN | — | ◇ UNVERIFIED |
| MDMarks Design & Metalworks | Vancouver | WA | — | ◇ UNVERIFIED |
| MMMarksman Metal Company INC | Saint Michael | MN | — | ◇ UNVERIFIED |
| MWMarks Welding & Fabricating | Thorsby | AL | — | ◇ UNVERIFIED |
| MFMarlatt Fabricators INC. | Sandia | TX | — | ◇ UNVERIFIED |
| MPMarlton Pike Precision | Cherry Hill | NJ | — | ◇ UNVERIFIED |
| MMMaro Manufacturing, INC. | Tulsa | OK | — | ◇ UNVERIFIED |
| MMMarquardt & Mueller Machining, INC | Woodstock | IL | — | ◇ UNVERIFIED |
| MRMarshall Ruby INC | Frostburg | MD | — | ◇ UNVERIFIED |
| MMMarshal Machinery INC | San Clemente | CA | — | ◇ UNVERIFIED |
| MIMarstan INC | Coon Rapids | MN | — | ◇ UNVERIFIED |
| MIMarti, Inc. | Bemidji | MN | — | ◇ UNVERIFIED |
| MSMartin Sheet Metal, INC. | Amarillo | TX | — | ◇ UNVERIFIED |
| MWMartin Welding and Fabrication LLC | Contoocook | NH | — | ◇ UNVERIFIED |
| MMMarvel Machining Enterprises LLC | Bensenville | IL | — | ◇ UNVERIFIED |
| MDMarx Digital Mfg, Inc | Las Vegas | NV | — | ◇ UNVERIFIED |
| MSMaryland Structural Fabricators INC | Millington | MD | — | ◇ UNVERIFIED |
| MHMascotte Home Security Products INC | Portland | OR | — | ◇ UNVERIFIED |
| MCMason Corporation | Jemison | AL | — | ◇ UNVERIFIED |
| MMMason Machinings INC | Morristown | TN | — | ◇ UNVERIFIED |
| MLMasonmarine.net LLC | San Dimas | CA | — | ◇ UNVERIFIED |
| MOMason & Overstreet Welding & Machine Works, INC. | Pearl | MS | — | ◇ UNVERIFIED |
| MMMassey Metals INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MMMass. Machine, INC. | Westwood | MA | — | ◇ UNVERIFIED |
| MMMasteq Manufacturing, LLC | New Berlin | WI | — | ◇ UNVERIFIED |
| MBMaster Bilt Products Site 2 | New Albany | MS | — | ◇ UNVERIFIED |
| MMMastercraft Machine INC | West Valley City | UT | — | ◇ UNVERIFIED |
| MFMaster Fabrication LLC | Knoxville | IA | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Blaine | MN | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Houston | TX | — | ◇ UNVERIFIED |
| MMMaster Matic INC | Osseo | MN | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal, INC. | Schofield Barracks | HI | — | ◇ 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 |
| MHMastic Home Exteriors, INC. | Sidney | OH | — | ◇ UNVERIFIED |
| MCMasto Contractor Services INC | Albuquerque | NM | — | ◇ UNVERIFIED |
| MHMaterial Handling Technology | Fair Haven | MI | — | ◇ UNVERIFIED |
| MRMaterial Resources INC | Forest Grove | OR | — | ◇ UNVERIFIED |
| MSMaterial Supply INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MHMatic Hydraulics, INC. | College Point | NY | — | ◇ UNVERIFIED |
 Matrix Machine & Manufacturing LLC | Broomfield | CO | — | ◇ UNVERIFIED |
| MMMatrix Machining Inc. | Neenah | WI | — | ◇ UNVERIFIED |
| MTMatrix Tooling & Design INC | Ramsey | MN | — | ◇ UNVERIFIED |
| MIMattei, INC. | Harlingen | TX | — | ◇ UNVERIFIED |
| MBMatthew Bronze West Annex Facility | Kingwood | WV | — | ◇ UNVERIFIED |
| MBMatthews Blow Pipe CO INC | Memphis | TN | — | ◇ UNVERIFIED |
| MMMatt Machine & Manufacturing, INC. | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MMMaupins Machine Shop | Dodge City | KS | — | ◇ UNVERIFIED |
| MRMaverick Realty LLC | Norman | OK | — | ◇ UNVERIFIED |
| MSMaverick Sheet Metal LLC | Conroe | TX | — | ◇ UNVERIFIED |
| MIMaxanns INC | Greeley | CO | — | ◇ UNVERIFIED |
| MCMaxcam Corporation | White Bear Lake | MN | — | ◇ UNVERIFIED |
| MMMaxim Motor Sports | Lake Havasu City | AZ | — | ◇ UNVERIFIED |
| MPMaximus Precison | Springfield | VT | — | ◇ UNVERIFIED |
| MPMaximus Precison | North Springfield | VT | — | ◇ UNVERIFIED |
| MAMayaguez Auto Part | Mayaguez | PR | — | ◇ UNVERIFIED |
| MJMaya Jig Grinding & Gage Co. | Plymouth | MI | — | ◇ UNVERIFIED |
| MLMaynard Lake Machining LLC | Dassel | MN | — | ◇ UNVERIFIED |
| MEMayoni Enterprises | Pacoima | CA | — | ◇ UNVERIFIED |
| MMMayor's Machine Works, INC. | Sugar Land | TX | — | ◇ UNVERIFIED |
| MLMaysteel, LLC | Allenton | WI | — | ◇ UNVERIFIED |
| MSMaysteel Star Precision | Longmont | CO | — | ◇ UNVERIFIED |
| MGMbi Global, LLC | Lafayette | LA | — | ◇ UNVERIFIED |
| MSM&b Steel Fabricators, INC. | Orlando | FL | — | ◇ UNVERIFIED |
| MCMbta Charlestown Non-revenue Automotive Garage | Charlestown | MA | — | ◇ UNVERIFIED |
| MMMcadams & Mcadams, INC. D/b/a M & M Welding | Archdale | NC | — | ◇ UNVERIFIED |
| MMMcadoo Machine Company | Kelayres | PA | — | ◇ UNVERIFIED |
| MMMcallen Motor Mart Machine Shop | Mcallen | TX | — | ◇ UNVERIFIED |
| MPMcarthur Park, INC. Dba the Bleacherman | Corinth | NY | — | ◇ UNVERIFIED |
| MRMcbride's Research & Machine, INC. | Sparks | NV | — | ◇ UNVERIFIED |
| MMMccabe Metal Products INC | Salem | OR | — | ◇ UNVERIFIED |
| MIMcclister INC | Tualatin | OR | — | ◇ UNVERIFIED |
| MSMccorvey Sheet Metal Works LP | Murphy | NC | — | ◇ UNVERIFIED |
