| LGLyon Gear & Machine INC | Rochester | MI | Machinery Manufacturing333515 | 100-499 | ◐ LIKELY ACTIVE |
Machineworks Manufacturing | Northridge | CA | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| MTMack Trucks Inc/macungie | Macungie | PA | Transportation Equipment Manufacturing336120 | — | ◐ LIKELY ACTIVE |
| MPMagna Powertrain East | Muncie | IN | Transportation Equipment Manufacturing336350 | 20-99 | ◐ LIKELY ACTIVE |
| MSMagna Seating South Carolina | Moore | SC | Transportation Equipment Manufacturing336360 | 500+ | ◐ LIKELY ACTIVE |
| MMancor | Dayton | OH | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
| MPManley Performance Products INC | Lakewood | NJ | Transportation Equipment Manufacturing336310 | 20-99 | ◐ LIKELY ACTIVE |
| MPMann+hummel Purolator Filters LLC | Fayetteville | NC | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| MMMarine Master Trailers | Tullahoma | TN | Transportation Equipment Manufacturing336214 | 20-99 | ◐ LIKELY ACTIVE |
| MEMarshall Engines INC | Kearney | NE | Machinery Manufacturing333618 | 100-499 | ◐ LIKELY ACTIVE |
| MAMartinrea Automotive Structures | Shannon | MS | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| MJMartinrea Jonesville LLC | Jonesville | MI | Transportation Equipment Manufacturing336370 | 500+ | ◐ LIKELY ACTIVE |
| MBMaverick Boat Company | Fort Pierce | FL | Transportation Equipment Manufacturing336612 | 100-499 | ◐ LIKELY ACTIVE |
| MBM B Sports | Atwater | CA | Transportation Equipment Manufacturing336612 | — | ◐ LIKELY ACTIVE |
| MIMeiwa Industry North America, INC | Lewisburg | TN | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| MPMelling Products North LLC | Farwell | MI | Machinery Manufacturing333611 | 20-99 | ◐ LIKELY ACTIVE |
| MAMeritor Automotive | Morristown | TN | Transportation Equipment Manufacturing336350 | — | ◐ LIKELY ACTIVE |
| MHMeritor Heavy Vehicle Systems LLC | Frankfort | KY | Transportation Equipment Manufacturing336211 | — | ◐ LIKELY ACTIVE |
| MTMetals Testing CO | South Windsor | CT | Transportation Equipment Manufacturing336412 | — | ◐ LIKELY ACTIVE |
| MIMgs Inc/const Denver | Denver | PA | Transportation Equipment Manufacturing336212 | — | ◐ LIKELY ACTIVE |
| MPMichigan Production Machining INC | Macomb | MI | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| MDMidland Divison of American Industries | Jerseyville | IL | Transportation Equipment Manufacturing336510 | 20-99 | ◐ LIKELY ACTIVE |
| MAMidway Aircraft Instrument Corporation | Monroe | NC | Transportation Equipment Manufacturing336413 | 1-19 | ◐ LIKELY ACTIVE |
Midwest Industries INC | Ida Grove | IA | Machinery Manufacturing333923 | 100-499 | ◐ LIKELY ACTIVE |
| MAMinebea Accesssolutions USA INC. | Selma | AL | Fabricated Metal Product Manufacturing332510 | 100-499 | ◐ LIKELY ACTIVE |
| MMMissouri Metals | Wentzville | MO | Transportation Equipment Manufacturing336413 | 20-99 | ◐ LIKELY ACTIVE |
Modine Manufacturing Company | Lawrenceburg | TN | Machinery Manufacturing333414 | — | ◐ LIKELY ACTIVE |
| MFMolded Fiber Glass Company/north Carolina | Morganton | NC | Plastics and Rubber Products Manufacturing326111 | — | ◐ LIKELY ACTIVE |
| MMMonitor Manufacturing CO. | Cartersville | GA | Fabricated Metal Product Manufacturing332119 | 100-499 | ◐ LIKELY ACTIVE |
| MTMonroe Truck Equipment | Flint | MI | Transportation Equipment Manufacturing336110 | 20-99 | ◐ LIKELY ACTIVE |
| MTMonroe Truck Equipment | Marshfield | WI | Transportation Equipment Manufacturing336210 | 20-99 | ◐ LIKELY ACTIVE |
| MTMonroe Truck Equipment | Joliet | IL | Transportation Equipment Manufacturing336211 | 20-99 | ◐ LIKELY ACTIVE |
| MTMonroe Truck Equipment INC | Louisville | KY | Transportation Equipment Manufacturing336112 | 20-99 | ◐ LIKELY ACTIVE |
Monroe Truck Equipment, INC. | Louisville | KY | Transportation Equipment Manufacturing336112 | 20-99 | ◐ LIKELY ACTIVE |
| MOMontaplast of North America INC | Frankfort | KY | Plastics and Rubber Products Manufacturing326121 | 500+ | ◐ LIKELY ACTIVE |
| MTMorgan Truck Body LLC - Mct | Moosup | CT | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
Motor Coach Industries INC | Pembina | ND | Transportation Equipment Manufacturing336120 | 100-499 | ◐ LIKELY ACTIVE |
| MSMpt Sterling Heights | Sterling Heights | MI | Transportation Equipment Manufacturing336350 | 100-499 | ◐ LIKELY ACTIVE |
| MTMt Texas | San Antonio | TX | Transportation Equipment Manufacturing336412 | 20-99 | ◐ LIKELY ACTIVE |
| MAMusashi Auto Parts - Michigan INC | Battle Creek | MI | Transportation Equipment Manufacturing336350 | — | ◐ LIKELY ACTIVE |
| NANaval Air Station Jacksonville | Jacksonville | FL | Transportation Equipment Manufacturing336411 | — | ◐ LIKELY ACTIVE |
| NBNaval Base Kitsap at Bangor | Silverdale | WA | Transportation Equipment Manufacturing336611 | — | ◐ LIKELY ACTIVE |
| NSNavistar San Antonio Manufacturing | San Antonio | TX | Transportation Equipment Manufacturing336110 | 500+ | ◐ LIKELY ACTIVE |
| NSNew Sabina Industries Incorporated | Sabina | OH | Computer and Electronic Product Manufacturing334418 | 100-499 | ◐ LIKELY ACTIVE |
| NSNgk Spark Plugs (usa), Inc., Sissonville | Sissonville | WV | Transportation Equipment Manufacturing336320 | 500+ | ◐ LIKELY ACTIVE |
| NINickson Industries | Plainville | CT | Transportation Equipment Manufacturing336390 | 20-99 | ◐ LIKELY ACTIVE |
| NNNissan NA INC | Decherd | TN | Transportation Equipment Manufacturing336310 | — | ◐ LIKELY ACTIVE |
| NNNissan North America Inc, Canton Manufacturing Facility | Canton | MS | Transportation Equipment Manufacturing336110 | — | ◐ LIKELY ACTIVE |
| NANorth American Bus Industries INC | Anniston | AL | Transportation Equipment Manufacturing336112 | — | ◐ LIKELY ACTIVE |
| NANorth American Lighting INC | Paris | IL | Transportation Equipment Manufacturing336320 | — | ◐ LIKELY ACTIVE |