| MPMahoning Paint CORP | Youngstown | OH | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| MSMain Steel Polishing CO. INC. | Youngstown | OH | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MIMane, INC. (1413080481) | Milford | OH | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| MFMansfield Foundry Corporation | Mansfield | OH | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| MWMansfield Warehousing & Distribution INC | Delaware | OH | Electrical Equipment, Appliance & Component Manufacturing335221 | — | ◇ UNVERIFIED |
| MCMantaline Corporation | Hiram | OH | Plastics and Rubber Products Manufacturing326291 | — | ◇ UNVERIFIED |
| MEManufacturers Enameling CORP | Toledo | OH | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MEMarathon Electric Manufacturing CORP | Lima | OH | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| MIMar-bal INC | Chagrin Falls | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| MGMark Gray Enterprises | Columbus | OH | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
 Mars Petcare US INC | Washington Court House | OH | Food Manufacturing311111 | — | ◇ UNVERIFIED |
| MMMartin Marietta Aggregates - Fairfield | Fairfield | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MMMartin Marietta Materials INC - Fairborn | Medway | OH | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MSMartin Sprocket & Gear INC | Montpelier | OH | Fabricated Metal Product Manufacturing332991 | — | ◇ UNVERIFIED |
| MIMar-zane INC Plant 2 | Marietta | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MIMar-zane, INC. Plant #24 | Akron | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MIMar-zane, INC. - Plant 28 | Youngstown | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MPMar-zane Plant No 10 | Zanesville | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 4 (0637000000) | Haydenville | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 5 | Stockport | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 9 | Richmond Dale | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MZMar Zane Plant No 9 (0671000006) | Chillicothe | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MCMasco Cabinetry Middlefield LLC Plant 2 | Middlefield | OH | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MRMasco Retail Cabinet Group | Waverly | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| MAMassillon Asphalt Company (1576001624) | Massillon | OH | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MBMaster Blasters | Beaverdam | OH | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MIMastercraft Industries | Berlin | OH | Plastics and Rubber Products Manufacturing326150 | — | ◇ UNVERIFIED |
| MCMauser CORP | Blacklick | OH | Fabricated Metal Product Manufacturing332439 | — | ◇ UNVERIFIED |
| MWMaxiom Wheels, Akron Operation (1677010157) | Akron | OH | Transportation Equipment Manufacturing336320 | — | ◇ UNVERIFIED |
| MIMca Industries (1576130147) | Massillon | OH | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| MPMccauley Propeller Systems, INC | Vandalia | OH | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| MMMcc Manufacturing, INC. (1413020513) | Batavia | OH | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MDMcdonnell Douglas CORP Air Force Plant 85 | Columbus | OH | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| MDMcgill Development Corporation | Westerville | OH | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| MPMedina Plating CORP Plant 2 | Medina | OH | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| MSMedina Supply North Ridgeville Plant 500 | North Ridgeville | OH | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MGMelnor Graphics Fka North Toledo Graphics LLC (0448010300) | Toledo | OH | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| MPMercury Plastics, LLC | Middlefield | OH | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| MAMeridian Automotive | Jackson | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| MIMerillat Industries INC * | Loudonville | OH | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MHMeritor Heavy Vehicle Systems LLC | Heath | OH | Transportation Equipment Manufacturing336320 | — | ◇ UNVERIFIED |
| MWMerritt Woodwork | Mentor | OH | Furniture and Related Product Manufacturing337212 | — | ◇ UNVERIFIED |
| MMMetal Management Ohio | Defiance | OH | Computer and Electronic Product Manufacturing334512 | — | ◇ UNVERIFIED |
| MCMetokote Corporation, Plant 13 (0857823023) | Huber Heights | OH | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MCMetokote Corporation, Plant21 (0448031046) | Maumee | OH | Fabricated Metal Product Manufacturing332613 | — | ◇ UNVERIFIED |
| MCMetokote CORP Plant 9 | Sheffield Lake | OH | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MIMicro Industries CORP | Westerville | OH | Computer and Electronic Product Manufacturing334111 | — | ◇ UNVERIFIED |
| MMMicro-poise Measurements Systems LLC (1667080054) | Streetsboro | OH | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| MPMid-america Packaging (1677130067) | Twinsburg | OH | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| MIMid-states Intl Motocross INC | Amherst | OH | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
