| MMMason Machinings INC | Morristown | TN | — | ◇ UNVERIFIED |
| MLMasonmarine.net LLC | San Dimas | CA | — | ◇ UNVERIFIED |
| MOMason & Overstreet Welding & Machine Works, INC. | Pearl | MS | — | ◇ UNVERIFIED |
| MRMasonry Reinforcing Corporation of America | Charlotte | NC | — | ◇ UNVERIFIED |
| MIMasport Incorporated | Lincoln | NE | — | ◇ UNVERIFIED |
| MLMasses LLC | Las Vegas | NV | — | ◇ UNVERIFIED |
| MMMassey Metals INC. | Tampa | FL | — | ◇ UNVERIFIED |
| MMMass. Machine, INC. | Westwood | MA | — | ◇ UNVERIFIED |
| MPMass Precision, INC | San Jose | CA | — | ◇ UNVERIFIED |
| MMMasteq Manufacturing, LLC | New Berlin | WI | — | ◇ UNVERIFIED |
| MBMaster Bilt Products Site 2 | New Albany | MS | — | ◇ UNVERIFIED |
| MCMaster Craft Extrusion Tools INC | Northport | MI | — | ◇ UNVERIFIED |
| MMMastercraft Machine INC | West Valley City | UT | — | ◇ UNVERIFIED |
| MMMastercraft Metal Polishing | Sun Valley | CA | — | ◇ UNVERIFIED |
| MFMaster Fabrication LLC | Knoxville | IA | — | ◇ UNVERIFIED |
| MTMasterform Tool Company | Franklin Park | IL | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Blaine | MN | — | ◇ UNVERIFIED |
| MMMaster Machine, INC. | Houston | TX | — | ◇ UNVERIFIED |
| MMMaster Machine & Repair Corporation | Bedford Park | IL | — | ◇ UNVERIFIED |
| MMMaster Magnetics, INC. | Castle Rock | CO | — | ◇ UNVERIFIED |
| MMMaster Matic INC | Osseo | MN | — | ◇ UNVERIFIED |
| MMMaster Metal Polishing Corp. | Paterson | NJ | — | ◇ UNVERIFIED |
| MCMasters CORP | Lowell | MA | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal | New York | NY | — | ◇ UNVERIFIED |
| MSMaster Sheet Metal, INC. | Schofield Barracks | HI | — | ◇ UNVERIFIED |
 Masters Machine, LLC | Richmond | MI | — | ◇ UNVERIFIED |
| Masters Machine Shop INC | Mankato | MN | — | ◇ UNVERIFIED |
| MPMasters Plating | Rockford | IL | — | ◇ 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 |
| MFMatch Fit Grind & Lap | Riverside | CA | — | ◇ UNVERIFIED |
| MCMaterial Control | Croswell | MI | — | ◇ UNVERIFIED |
| MCMaterial Control INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| MCMaterial Control, INC. | Arlington | TX | — | ◇ UNVERIFIED |
| MHMaterial Handling Technology | Fair Haven | MI | — | ◇ UNVERIFIED |
| MSMaterial Supply INC. | Las Vegas | NV | — | ◇ UNVERIFIED |
| MDMathias Die Company, Inc. | Golden Valley | MN | — | ◇ UNVERIFIED |
| MDMathias Die Company INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| MHMat Holdings INC. Dba Midwest Air Technologies | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| MHMatic Hydraulics, INC. | College Point | NY | — | ◇ UNVERIFIED |
| MIMatlab INC | Ramseur | NC | — | ◇ UNVERIFIED |
| MIMatlab, INC. | Greensboro | NC | — | ◇ UNVERIFIED |
 Matrix Machine & Manufacturing LLC | Broomfield | CO | — | ◇ UNVERIFIED |
| MMMatrix Machining Inc. | Neenah | WI | — | ◇ UNVERIFIED |
| MMMatrix Manufacturing, INC. | Springfield | MO | — | ◇ UNVERIFIED |
| MTMatrix Tooling & Design INC | Ramsey | MN | — | ◇ UNVERIFIED |
| MBMatthews Blow Pipe CO INC | Memphis | TN | — | ◇ UNVERIFIED |
 Matthews International Corporation | San Jacinto | CA | — | ◇ UNVERIFIED |
| MMMatthews Manufacturing INC. | Saint Louis | MO | — | ◇ UNVERIFIED |
| MMMatthews Manufacturing, INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| MMMatt Machine & Manufacturing, INC. | Pittsburgh | PA | — | ◇ UNVERIFIED |
| MMMatt's Metal Stitch LLC | Hamburg | NY | — | ◇ UNVERIFIED |
| MEMatzke Enterprises, INC. | Salem | WI | — | ◇ UNVERIFIED |
| MMaudlin | Kemah | TX | — | ◇ UNVERIFIED |
| MAMaumee Assembly & Stamping | Maumee | OH | — | ◇ UNVERIFIED |
| MMMaupins Machine Shop | Dodge City | KS | — | ◇ UNVERIFIED |
 Maverick Manufacturing LLC | Lakeville | MN | — | ◇ UNVERIFIED |
| MRMaverick Realty LLC | Norman | OK | — | ◇ UNVERIFIED |
| MSMaverick Sheet Metal LLC | Conroe | TX | — | ◇ UNVERIFIED |
| MCMaxcam Corporation | White Bear Lake | MN | — | ◇ UNVERIFIED |
| MCMax Coating, INC. | Atlanta | GA | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MMMaxco Manufacturing LLC | Ona | WV | — | ◇ UNVERIFIED |
| MCMaxim Crane Works of Pennsylvania Limited Partners | Lexington | KY | — | ◇ UNVERIFIED |
| MDMaxim Douglas | Ventura | CA | — | ◇ UNVERIFIED |
| MMMaxim Motor Sports | Lake Havasu City | AZ | — | ◇ UNVERIFIED |
| MCMaximum Coatings and Sandblasting LLC | Wisconsin Rapids | WI | — | ◇ UNVERIFIED |
| MLMaximus-3 LLC | Auburn Hills | MI | — | ◇ UNVERIFIED |
| MPMaximus Precison | Springfield | VT | — | ◇ UNVERIFIED |
| MPMaximus Precison | North Springfield | VT | — | ◇ UNVERIFIED |
 Max Machining, LLC | Perkasie | PA | — | ◇ UNVERIFIED |
| MMMax Manufacturing INC | Bend | OR | — | ◇ UNVERIFIED |
| MNMax Nitz Polishing | Baroda | MI | — | ◇ UNVERIFIED |
| MAMayaguez Auto Part | Mayaguez | PR | — | ◇ UNVERIFIED |
| MJMaya Jig Grinding & Gage Co. | Plymouth | MI | — | ◇ UNVERIFIED |
| MFMay Foundry & Machine CO | Slc | UT | — | ◇ 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 |
| MPMaysteel Porters | Garland | TX | — | ◇ UNVERIFIED |
| MSMaysteel Star Precision | Longmont | CO | — | ◇ UNVERIFIED |
 Mayville Engineering Company, INC. | Beaver Dam | WI | — | ◇ UNVERIFIED |
| MNMazza New York LLC | new york | NY | — | ◇ UNVERIFIED |
| MGMbi Global, LLC | Lafayette | LA | — | ◇ UNVERIFIED |
| MIM-b Industries, INC. | Rosman | NC | — | ◇ UNVERIFIED |
| MBM & B Property LLC | Brandon | MN | — | ◇ UNVERIFIED |
| MCMbta Charlestown Non-revenue Automotive Garage | Charlestown | MA | — | ◇ UNVERIFIED |
| MWMb Weld LLC | Waynesboro | VA | — | ◇ UNVERIFIED |
| MMMcadoo Machine Company | Kelayres | PA | — | ◇ UNVERIFIED |
| MMMcallen Motor Mart Machine Shop | Mcallen | TX | — | ◇ UNVERIFIED |
| MPMcarthur Park, INC. Dba the Bleacherman | Corinth | NY | — | ◇ UNVERIFIED |
| MEMcB Enviro Corporation | Indianapolis | IN | — | ◇ UNVERIFIED |
| MBMc Bradford INC Dba Bradford Powder Coating | Chula Vista | CA | — | ◇ UNVERIFIED |
| MRMcbride's Research & Machine, INC. | Sparks | NV | — | ◇ UNVERIFIED |
| MMMccabe Metal Products INC | Salem | OR | — | ◇ UNVERIFIED |
| MIMccampbell INC | Destrehan | LA | — | ◇ UNVERIFIED |
| MWMcconnells Welding INC | Denver | CO | — | ◇ UNVERIFIED |
