| LGLyon Gear & Machine INC | Rochester | MI | Machinery Manufacturing333515 | 100-499 | ◐ LIKELY ACTIVE |
| MTMack Trucks | Hagerstown | MD | Machinery Manufacturing333618 | — | ◐ LIKELY ACTIVE |
| MMMac Machine & Metal Works INC | Connersville | IN | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| MMMagor Mold, INC. | San Dimas | CA | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| MIMalnove INC of Florida | Jacksonville | FL | Paper Manufacturing322212 | 100-499 | ◐ LIKELY ACTIVE |
| MAManitou Americas INC | Yankton | SD | Machinery Manufacturing333120 | — | ◐ LIKELY ACTIVE |
| MCManitowoc Cranes Inc- Manitowoc, WI | Manitowoc | WI | Machinery Manufacturing333120 | 20-99 | ◐ LIKELY ACTIVE |
| MIMansfield Industries INC | Mansfield | OH | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| MEMarathon Equipment Company-vernon | Vernon | AL | Machinery Manufacturing333310 | 100-499 | ◐ LIKELY ACTIVE |
| MEMarshall Engines INC | Kearney | NE | Machinery Manufacturing333618 | 100-499 | ◐ LIKELY ACTIVE |
| MMMartin Mtd Consumer Group INC | Martin | TN | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| MSMartin Sprocket & Gear Arlington | Arlington | TX | Machinery Manufacturing333613 | 100-499 | ◐ LIKELY ACTIVE |
| MYMartin Yale Industries | Wabash | IN | Fabricated Metal Product Manufacturing332322 | 20-99 | ◐ LIKELY ACTIVE |
| MPMate Precision Tooling | Anoka | MN | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| MIMat Industries | Jackson | TN | Machinery Manufacturing333912 | 100-499 | ◐ LIKELY ACTIVE |
| MPMatrix Packaging Machinery | Grafton | WI | Fabricated Metal Product Manufacturing332810 | 20-99 | ◐ LIKELY ACTIVE |
| MDMax Daetwyler CORP | Huntersville | NC | Machinery Manufacturing333244 | 20-99 | ◐ LIKELY ACTIVE |
| MCMaxon CORP | Muncie | IN | Machinery Manufacturing333414 | — | ◐ LIKELY ACTIVE |
| MIMayfran International INC | Cleveland | OH | Machinery Manufacturing333922 | 100-499 | ◐ LIKELY ACTIVE |
Mcdal Corporation | King of Prussia | PA | Machinery Manufacturing333923 | — | ◐ LIKELY ACTIVE |
| MCMclanahan CORP | Hollidaysburg | PA | Nonmetallic Mineral Product Manufacturing327400 | 100-499 | ◐ LIKELY ACTIVE |
Mclaughlin Body Company INC | Anderson | SC | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| MPMelling Products North LLC | Farwell | MI | Machinery Manufacturing333611 | 20-99 | ◐ LIKELY ACTIVE |
| MMMelton Machine and Control CO | Washington | MO | Machinery Manufacturing333319 | 100-499 | ◐ LIKELY ACTIVE |
| MTMembrane Technology & Research INC | Newark | CA | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| MLMenardi LLC | Trenton | SC | Textile Product Mills314999 | 20-99 | ◐ LIKELY ACTIVE |
| MUMenk USA | Sterling | IL | Machinery Manufacturing333414 | 20-99 | ◐ LIKELY ACTIVE |
| MCMesser Cutting Systems INC | Menomonee Falls | WI | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
| MTMettler Toledo | Lutz | FL | Machinery Manufacturing333310 | 500+ | ◐ LIKELY ACTIVE |
| MAMeyn America LLC | Ball Ground | GA | Food Manufacturing311615 | 100-499 | ◐ LIKELY ACTIVE |
| MAMid America Machine | Mayfield | KY | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
Midwest Industries INC | Ida Grove | IA | Machinery Manufacturing333923 | 100-499 | ◐ LIKELY ACTIVE |
| MWMidwest Welding and Manufacturing LLC | Reeseville | WI | Fabricated Metal Product Manufacturing332999 | 20-99 | ◐ LIKELY ACTIVE |
| MEMillersburg Equipment & Machine, INC | Millersburg | KY | Machinery Manufacturing333131 | 20-99 | ◐ LIKELY ACTIVE |
| MPMiracle Paint Rejuvenator Company, INC. | Inver Grove Heights | MN | Machinery Manufacturing333248 | — | ◐ LIKELY ACTIVE |
| MIMjc INC | Cartersville | GA | Fabricated Metal Product Manufacturing332313 | 100-499 | ◐ LIKELY ACTIVE |
| MCModern Custom Fabrication INC | Fresno | CA | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MPModern Packaging | Deer Park | NY | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
Modine Grenada Llc, Ccp and Lal Facilities | Grenada | MS | Machinery Manufacturing333415 | — | ◐ LIKELY ACTIVE |
Modine Manufacturing Company | Lawrenceburg | TN | Machinery Manufacturing333414 | — | ◐ LIKELY ACTIVE |
| MPMold-rite Plastics | Plattsburgh | NY | Plastics and Rubber Products Manufacturing326121 | 100-499 | ◐ LIKELY ACTIVE |
| MTMontana Timber Products | Caldwell | ID | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| MOMoog Orrville | Orrville | OH | Fabricated Metal Product Manufacturing332912 | 20-99 | ◐ LIKELY ACTIVE |
| MTMorgantown Tech Svc/perry Twp Plt | Mount Morris | PA | Machinery Manufacturing333131 | — | ◐ LIKELY ACTIVE |
| MPMountain Power Hydraulics | Mountain Lake | MN | Machinery Manufacturing333995 | 20-99 | ◐ LIKELY ACTIVE |
| MIMpi, INC. | Poughkeepsie | NY | Machinery Manufacturing333248 | 20-99 | ◐ LIKELY ACTIVE |
| MPM&r Printing Equipment INC | Roselle | IL | Machinery Manufacturing333248 | 100-499 | ◐ LIKELY ACTIVE |
| MSMt Systems, INC | Canton | OH | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| MCMulti Chem Group LLC Washington Facility | Washington | PA | Machinery Manufacturing333318 | — | ◐ LIKELY ACTIVE |
| MPMulti Precision Detail | Auburn Hills | MI | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |