| LGLee's Grinding, INC. | Strongsville | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| LALegrand Avd (1431053380) | Cincinnati | OH | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| LCLiberty Casting CO (0121010003) | Delaware | OH | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| LILinde INC | Ashtabula | OH | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| LSLivi Steel Inc | Warren | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
L.j. Star Incorporated | Twinsburg | OH | Computer and Electronic Product Manufacturing334513 | — | ◐ LIKELY ACTIVE |
| LPLoc Performance Products LLC | St. Marys | OH | Plastics and Rubber Products Manufacturing326291 | — | ◐ LIKELY ACTIVE |
| LALubrizol Advanced Materials | Avon Lake | OH | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| LCLudlow Composites CORP | Fremont | OH | Plastics and Rubber Products Manufacturing326291 | 20-99 | ◐ LIKELY ACTIVE |
| LALyondellbasell Advanced Polymers INC. (1677011002) | Akron | OH | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| MCMack Concrete | Akron | OH | Nonmetallic Mineral Product Manufacturing327320 | 20-99 | ◐ LIKELY ACTIVE |
Mack Industries, INC. | Valley City | OH | Nonmetallic Mineral Product Manufacturing327320 | 100-499 | ◐ LIKELY ACTIVE |
Mack Industries of Bluffton | Bluffton | OH | Nonmetallic Mineral Product Manufacturing327390 | 1-19 | ◐ LIKELY ACTIVE |
Makers Supply LLC | Piqua | OH | Wood Product Manufacturing321920 | 1-19 | ◐ LIKELY ACTIVE |
| MEMansfield Engineered Components | Mansfield | OH | Fabricated Metal Product Manufacturing332510 | 100-499 | ◐ LIKELY ACTIVE |
| MIMansfield Industries INC | Mansfield | OH | Primary Metal Manufacturing331529 | 20-99 | ◐ LIKELY ACTIVE |
| MEManufacturers Equipment CO | Middletown | OH | Fabricated Metal Product Manufacturing332618 | 1-19 | ◐ LIKELY ACTIVE |
| MPMarathon Petroleum Company LP | Findlay | OH | Petroleum and Coal Products Manufacturing324110 | — | ◐ LIKELY ACTIVE |
| MAMarble Arch Products INC. (1483040411) | Franklin | OH | Plastics and Rubber Products Manufacturing326199 | — | ◐ LIKELY ACTIVE |
| MBM Bohlke Veneer CORP | Fairfield | OH | Wood Product Manufacturing321211 | 100-499 | ◐ LIKELY ACTIVE |
| MIMcHenry Industries | Youngstown | OH | Miscellaneous Manufacturing339950 | 20-99 | ◐ LIKELY ACTIVE |
| MMMennel Milling CO | Fostoria | OH | Food Manufacturing311211 | — | ◐ LIKELY ACTIVE |
| MBMfm Building Products CORP. | Coshocton | OH | Petroleum and Coal Products Manufacturing324122 | 20-99 | ◐ LIKELY ACTIVE |
| MFMicrotek Finishing LLC | West Chester | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| MIMidwestern Industries INC. | Massillon | OH | Fabricated Metal Product Manufacturing332618 | 20-99 | ◐ LIKELY ACTIVE |
| MIMillat Industries, CORP. | Kettering | OH | Transportation Equipment Manufacturing336412 | 100-499 | ◐ LIKELY ACTIVE |
| MBMiller Brewering CO. | Trenton | OH | Beverage and Tobacco Product Manufacturing312120 | — | ◐ LIKELY ACTIVE |
| MPMiller Precision Mfg. Industries, Inc. | Ottoville | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MMMills Metal Finishing | Columbus | OH | Fabricated Metal Product Manufacturing332813 | — | ◐ LIKELY ACTIVE |
| MLMillwood Lumber INC. | Gnadenhutten | OH | Wood Product Manufacturing321113 | 20-99 | ◐ LIKELY ACTIVE |
| MMMinster Machine CO | Minster | OH | Primary Metal Manufacturing331511 | — | ◐ LIKELY ACTIVE |
| MSModern Sheet Metal Works, INC. | Miamitown | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| MFMolded Fiber Glass Research Company * | Ashtabula | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
Momentive Performance Materials Quartz, INC. (0145000213) | Hebron | OH | Nonmetallic Mineral Product Manufacturing327120 | — | ◐ LIKELY ACTIVE |
Moms Gourmet, LLC | Newbury | OH | Food Manufacturing311942 | 1-19 | ◐ LIKELY ACTIVE |
| MMMontgomery Machine & Fabrication Inc | Jackson | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MOMoog Orrville | Orrville | OH | Fabricated Metal Product Manufacturing332912 | 20-99 | ◐ LIKELY ACTIVE |
| MCMorral Companies LLC | Morral | OH | Chemical Manufacturing325314 | 100-499 | ◐ LIKELY ACTIVE |
| MPMorrison Products Cleveland | Cleveland | OH | Machinery Manufacturing333413 | 100-499 | ◐ LIKELY ACTIVE |
| MPMPC Plating LLC | Brooklyn | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| MWMsc Walbridge Coatings INC (0387000046) | Walbridge | OH | Fabricated Metal Product Manufacturing332812 | — | ◐ LIKELY ACTIVE |
| NCNagase Chemtex America | Delaware | OH | Chemical Manufacturing325520 | 20-99 | ◐ LIKELY ACTIVE |
| NAN American Plastic & Chemical | Euclid | OH | Plastics and Rubber Products Manufacturing326112 | 20-99 | ◐ LIKELY ACTIVE |
| NFNational Fleet Services of Ohio | Avon Lake | OH | Transportation Equipment Manufacturing336212 | 100-499 | ◐ LIKELY ACTIVE |
National Machine Tool CO. | Cincinnati | OH | Machinery Manufacturing333517 | 1-19 | ◐ LIKELY ACTIVE |
| NCNeff-Perkins Co. | Middlefield | OH | Plastics and Rubber Products Manufacturing326291 | 20-99 | ◐ LIKELY ACTIVE |
| NSNeiheisel Steel CORP | Cincinnati | OH | Fabricated Metal Product Manufacturing332323 | 1-19 | ◐ LIKELY ACTIVE |
| NFNemco Food Equipment LTD | Hicksville | OH | Machinery Manufacturing333241 | 100-499 | ◐ LIKELY ACTIVE |
| NPNestle Purina Petcare Company | Batavia | OH | Food Manufacturing311111 | 100-499 | ◐ LIKELY ACTIVE |
| NSNew Sabina Industries Incorporated | Sabina | OH | Computer and Electronic Product Manufacturing334418 | 100-499 | ◐ LIKELY ACTIVE |