| MMMarble Masters of Middle Georg Ia | Warner Robins | GA | Plastics and Rubber Products Manufacturing326191 | 1-19 | ◇ UNVERIFIED |
| MCMarion County Timber, INC. | Foxworth | MS | Machinery Manufacturing333210 | 1-19 | ◇ UNVERIFIED |
| MSMarshall Sign CORP | Rensselaer | NY | Printing and Related Support Activities323119 | 1-19 | ◇ UNVERIFIED |
| MBMartin Brothers INC. | Winnsboro | LA | Machinery Manufacturing333241 | 1-19 | ◇ UNVERIFIED |
| MMMarting Mfg INC | Britt | IA | Machinery Manufacturing333111 | 1-19 | ◇ UNVERIFIED |
| MRMarysville Ready Mix Co., INC. | Marysville | KS | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| MCMaselter Cabinets INC | Rockville | MN | Furniture and Related Product Manufacturing337110 | 1-19 | ◇ UNVERIFIED |
| MIMasterbilt Incorporated | South Bend | IN | Fabricated Metal Product Manufacturing332710 | 1-19 | ◇ UNVERIFIED |
| MCMaster Craft, INC. | Bald Knob | AR | Primary Metal Manufacturing331512 | 1-19 | ◇ UNVERIFIED |
| MMMastercraft Metal Finishing INC | Seattle | WA | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MPMaster Printing INC | Carlstadt | NJ | Printing and Related Support Activities323110 | 1-19 | ◇ UNVERIFIED |
| MIMasterson Industries, INC | Round Rock | TX | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MMMaterial Management - Daniels Ready Mix | Winfield | KS | Nonmetallic Mineral Product Manufacturing327320 | 1-19 | ◇ UNVERIFIED |
| MPMaterial Processing and Handling CO | Fostoria | OH | Plastics and Rubber Products Manufacturing326199 | 1-19 | ◇ UNVERIFIED |
| MMMatrix Machining CORP | West Babylon | NY | Machinery Manufacturing333999 | 1-19 | ◇ UNVERIFIED |
| MPMatthews Plating INC | Jackson | MI | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MPMattingly Products | North Anson | ME | Petroleum and Coal Products Manufacturing324121 | 1-19 | ◇ UNVERIFIED |
| MPMaverick Powder Coat & Sandblast | Anaheim | CA | Fabricated Metal Product Manufacturing332812 | 1-19 | ◇ UNVERIFIED |
| MCMayfield Corporation | Wanatah | IN | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MVMay-wilbert Vault-pt Huron | Port Huron | MI | Fabricated Metal Product Manufacturing332999 | 1-19 | ◇ UNVERIFIED |
| MWMbc Woodshop INC | Morgantown | WV | Wood Product Manufacturing321918 | 1-19 | ◇ UNVERIFIED |
| MPMcauliffe Paper INC | Liverpool | NY | Paper Manufacturing322233 | 1-19 | ◇ UNVERIFIED |
| MMMccain Meat Processing LLC | Sandy Hook | MS | Food Manufacturing311611 | 1-19 | ◇ UNVERIFIED |
| MCMc Coating INC. | Miamisburg | OH | Fabricated Metal Product Manufacturing332812 | 1-19 | ◇ UNVERIFIED |
| MLMcentyre Lumber Company | Glencoe | AL | Wood Product Manufacturing321113 | 1-19 | ◇ UNVERIFIED |
| MLMcfadden Lighting-mcfadden Lighting | St. Louis | MO | Electrical Equipment, Appliance & Component Manufacturing335122 | 1-19 | ◇ UNVERIFIED |
| MMMcmillan Mechanical & Machine Co., INC. | Shreveport | LA | Fabricated Metal Product Manufacturing332710 | 1-19 | ◇ UNVERIFIED |
| MPMcnichols Polishing & Anodizing INC | Redford Twp | MI | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MPMercury Plastic Bag CO. | Passaic | NJ | Printing and Related Support Activities323111 | 1-19 | ◇ UNVERIFIED |
| MHMeridien Hardwoods/pittsfield | Pittsfield | PA | Wood Product Manufacturing321113 | 1-19 | ◇ UNVERIFIED |
| MMMerritt Machine INC | Mount Airy | NC | Fabricated Metal Product Manufacturing332999 | 1-19 | ◇ UNVERIFIED |
| MIMetalcast INC | Santa Ana | CA | Machinery Manufacturing333511 | 1-19 | ◇ UNVERIFIED |
| MCMetal Components INC | Paterson | NJ | Fabricated Metal Product Manufacturing332721 | 1-19 | ◇ UNVERIFIED |
| MCMetal Crafters INC | Stevens Point | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◇ UNVERIFIED |
| MIMetalfab INC | West Richland | WA | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MFMetal Finishers of Atlanta INC | Lilburn | GA | Fabricated Metal Product Manufacturing332119 | 1-19 | ◇ UNVERIFIED |
| MFMetal Finishing Co., INC. | Indianapolis | IN | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MBMetallic Bonds LTD | Beloit | WI | Fabricated Metal Product Manufacturing332710 | 1-19 | ◇ UNVERIFIED |
| MHMetallurgical High Vacuum CORP | Fennville | MI | Machinery Manufacturing333912 | 1-19 | ◇ UNVERIFIED |
| MMMetal Man Restoration | Mount Vernon | NY | Fabricated Metal Product Manufacturing332999 | 1-19 | ◇ UNVERIFIED |
| MSMetal Smith Designs INC | Fort Myers | FL | Furniture and Related Product Manufacturing337215 | 1-19 | ◇ UNVERIFIED |
| MIMetaltek Industries, INC. | Springfield | OH | Chemical Manufacturing325612 | 1-19 | ◇ UNVERIFIED |
| MPMetro Plating and Polishing Group INC. | Kensington | MD | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MPMetro Plating INC | Mesa | AZ | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MPMh Parks CO | Winchendon | MA | Furniture and Related Product Manufacturing337122 | 1-19 | ◇ UNVERIFIED |
| MFMiami Filter - Commercial Cir | Fort Pierce | FL | Transportation Equipment Manufacturing336992 | 1-19 | ◇ UNVERIFIED |
| MPMichigan Pallet INC | Charlotte | MI | Wood Product Manufacturing321920 | 1-19 | ◇ UNVERIFIED |
| MWMichigan Wood Fuels LLC | Holland | MI | Wood Product Manufacturing321999 | 1-19 | ◇ UNVERIFIED |
| MPMicro Plating Incorporated | Erie | PA | Fabricated Metal Product Manufacturing332813 | 1-19 | ◇ UNVERIFIED |
| MCMid Continent Fasteners INC | Rock Falls | IL | Miscellaneous Manufacturing339993 | 1-19 | ◇ UNVERIFIED |