| MRMetallix Refining INC. | Greenville | NC | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| MRMetalsa Roanoke INC | Roanoke | VA | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| MIMetaltek Intl - Wisconsin Investcast | Watertown | WI | Primary Metal Manufacturing331510 | 100-499 | ◐ LIKELY ACTIVE |
| MIMetco Ind | Saint Marys | PA | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| MRMetrex Research | Romulus | MI | Chemical Manufacturing325612 | — | ◐ LIKELY ACTIVE |
| MWM.g. Waldbaum Company - Gaylord | Gaylord | MN | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| MNMichelin NA Prime Facility | Greenville | SC | Plastics and Rubber Products Manufacturing326211 | 500+ | ◐ LIKELY ACTIVE |
| MIMichelman INC | Cincinnati | OH | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| MWMichigan Wheel CORP | Grand Rapids | MI | Primary Metal Manufacturing331525 | 20-99 | ◐ LIKELY ACTIVE |
| MTMicrochip Technology | Gresham | OR | Computer and Electronic Product Manufacturing334413 | 500+ | ◐ LIKELY ACTIVE |
| MCMicro Control Company | Fridley | MN | Textile Product Mills314999 | 100-499 | ◐ LIKELY ACTIVE |
Micron Technology, INC. | Manassas | VA | Computer and Electronic Product Manufacturing334413 | 500+ | ◐ LIKELY ACTIVE |
| MAMid America Agri Products Wheatland LLC | Madrid | NE | Chemical Manufacturing325193 | 20-99 | ◐ LIKELY ACTIVE |
| MAMid American Steel and Wire CO - Mill | Madill | OK | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| MMMidland Manufacturing CO. | Fort Worth | TX | Primary Metal Manufacturing331525 | 20-99 | ◐ LIKELY ACTIVE |
| MSMidland Steel | Wathena | KS | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MEMidwest Elastomers INC | Wapakoneta | OH | Chemical Manufacturing325212 | 20-99 | ◐ LIKELY ACTIVE |
| MFMid-west Forge CORP | Cleveland | OH | Fabricated Metal Product Manufacturing332111 | 100-499 | ◐ LIKELY ACTIVE |
Midwest Metal Products INC | Winona | MN | Primary Metal Manufacturing331511 | 20-99 | ◐ LIKELY ACTIVE |
| MSMidwest Sterilization Corp-jackson | Jackson | MO | Miscellaneous Manufacturing339113 | — | ◐ LIKELY ACTIVE |
| MMMilbank Manufacturing CO | Kansas City | MO | Fabricated Metal Product Manufacturing332439 | 100-499 | ◐ LIKELY ACTIVE |
| MMMilbank Manufacturing CO | El Dorado | AR | Fabricated Metal Product Manufacturing332439 | 100-499 | ◐ LIKELY ACTIVE |
| MMMilbank Manufacturing Company | Concordia | MO | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| MFMiles Fiberglass & Composites, INC. | Clackamas | OR | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MIMilkrite Interpuls INC | Johnson Creek | WI | Chemical Manufacturing325212 | 100-499 | ◐ LIKELY ACTIVE |
| MCMilliken & Co-pendleton Finishing Plant | Pendleton | SC | Textile Mills313210 | 100-499 | ◐ LIKELY ACTIVE |
| MMMill Masters, INC. | Jackson | TN | Fabricated Metal Product Manufacturing332997 | 20-99 | ◐ LIKELY ACTIVE |
| MPMills Products, INC. | Athens | TN | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| MPMilwaukee Plating CO | Milwaukee | WI | Fabricated Metal Product Manufacturing332810 | 20-99 | ◐ LIKELY ACTIVE |
| MMMincey Marble Manufacturing INC | Gainesville | GA | Plastics and Rubber Products Manufacturing326191 | 100-499 | ◐ LIKELY ACTIVE |
| MPMisco Products | Reading | PA | Chemical Manufacturing325611 | 100-499 | ◐ LIKELY ACTIVE |
| MEMitsubishi Electric Automotive America (1483090295) | Mason | OH | Transportation Equipment Manufacturing336310 | 100-499 | ◐ LIKELY ACTIVE |
| MSMiwon Specialty Chemical USA INC | Columbia | SC | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| MPMl Products LLC | Noble | OK | Chemical Manufacturing325212 | 20-99 | ◐ LIKELY ACTIVE |
| MCMnp CORP | Utica | MI | Primary Metal Manufacturing331222 | 100-499 | ◐ LIKELY ACTIVE |
| MDModern Door CORP | Walkerton | IN | Fabricated Metal Product Manufacturing332321 | 100-499 | ◐ LIKELY ACTIVE |
| MWModern Welding Company of Florida | Orlando | FL | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MWModern Welding CO of Iowa INC | Burlington | IA | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MPModineer Plant 7 | Saint Peters | MO | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
Modine Manufacturing CO | Buena Vista | VA | Machinery Manufacturing333414 | 100-499 | ◐ LIKELY ACTIVE |
Modine Manufacturing Company Joplin | Joplin | MO | Fabricated Metal Product Manufacturing332313 | 100-499 | ◐ LIKELY ACTIVE |
Modine Manufacturing Company Trenton | Trenton | MO | Transportation Equipment Manufacturing336211 | 100-499 | ◐ LIKELY ACTIVE |
| MIModuform, INC. | Fitchburg | MA | Furniture and Related Product Manufacturing337125 | 20-99 | ◐ LIKELY ACTIVE |
| MLMohawk Laboratories Greenville | Greenville | TX | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| MPMolding Products LLC | South Bend | IN | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| MGMondelez Global LLC | Chicago | IL | Food Manufacturing311812 | 500+ | ◐ LIKELY ACTIVE |
| MMMonett Metals INC | Monett | MO | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| MMMonogram Metals, INC. | Byesville | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MOMonotech of Mississippi, Fulton | Fulton | MS | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MPMontana Precision Products LLC | Butte | MT | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |