| LPLeonhardt Plating CO. | Cincinnati | OH | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |
| MPMansfield Plumbing Products INC China Division | Perrysville | OH | Nonmetallic Mineral Product Manufacturing327110 | 20-99 | ◐ LIKELY ACTIVE |
| MAM. Argueso & Co., INC. | Cleveland | OH | Petroleum and Coal Products Manufacturing324199 | — | ◐ LIKELY ACTIVE |
| MCMason Color Works INC | East Liverpool | OH | Chemical Manufacturing325130 | 1-19 | ◐ LIKELY ACTIVE |
| MCMazzella Companies | Cleveland | OH | Machinery Manufacturing333923 | 500+ | ◐ LIKELY ACTIVE |
| MGMechanical Galv-plating CORP | Sidney | OH | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| MIMetaltek International - Sandusky International Division | Sandusky | OH | Primary Metal Manufacturing331513 | — | ◐ LIKELY ACTIVE |
| MSMeteor Sealing Systems LLC (0679015004) | Dover | OH | Plastics and Rubber Products Manufacturing326291 | 500+ | ◐ LIKELY ACTIVE |
| MIMiami-cast, INC. | Miamisburg | OH | Primary Metal Manufacturing331511 | 1-19 | ◐ LIKELY ACTIVE |
| MAMidwest Acoust-a-fiber INC | Delaware | OH | Nonmetallic Mineral Product Manufacturing327993 | 100-499 | ◐ LIKELY ACTIVE |
| MMMk Metal Products Enterprises INC | Mansfield | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MIMonti Incorporated | Cincinnati | OH | Fabricated Metal Product Manufacturing332322 | 100-499 | ◐ LIKELY ACTIVE |
| MBMorris Bean & CO * | Yellow Springs | OH | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| MPMtd Products INC (1652000085) | Valley City | OH | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| MRMullins Rubber Products INC | Dayton | OH | Plastics and Rubber Products Manufacturing326291 | 20-99 | ◐ LIKELY ACTIVE |
| MOMurotech Ohio CORP | Saint Marys | OH | Transportation Equipment Manufacturing336370 | 20-99 | ◐ LIKELY ACTIVE |
| NINavistar, INC. | Springfield | OH | Transportation Equipment Manufacturing336120 | — | ◐ LIKELY ACTIVE |
| NTNewman Technology, INC (0370010118) | Mansfield | OH | Transportation Equipment Manufacturing336370 | 500+ | ◐ LIKELY ACTIVE |
| NDNext Dimension Components | Jefferson | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| NWNfm Welding Engineers INC | Massillon | OH | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| NPNicks Plating CO | Piqua | OH | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |
| NINilpeter, INC. | Cincinnati | OH | Chemical Manufacturing325910 | 20-99 | ◐ LIKELY ACTIVE |
| NMNof Metal Coatings North America INC | Chardon | OH | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| OAOhio Anodizing INC | Columbus | OH | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |
| OPOvation Polymer Technology and Engineered Materials | Medina | OH | Chemical Manufacturing325211 | 1-19 | ◐ LIKELY ACTIVE |
| PFPanel Fab, INC. | Cincinnati | OH | Electrical Equipment, Appliance & Component Manufacturing335312 | 100-499 | ◐ LIKELY ACTIVE |
| PPPerstorp Polyols, INC. (0448010133) | Toledo | OH | Chemical Manufacturing325199 | 100-499 | ◐ LIKELY ACTIVE |
| PMPioneer Manufacturing CO | Cleveland | OH | Chemical Manufacturing325510 | 100-499 | ◐ LIKELY ACTIVE |
| PIPlas-tanks Industries, INC. (1409040850) | Hamilton | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| PMPlate-all Metal CO | Akron | OH | Fabricated Metal Product Manufacturing332811 | 1-19 | ◐ LIKELY ACTIVE |
| PIPolysource, INC. | Piqua | OH | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| PIPolystar INC | Stow | OH | Plastics and Rubber Products Manufacturing326130 | 20-99 | ◐ LIKELY ACTIVE |
| PCPorter-guertin CO | Cincinnati | OH | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |
| PPPorter Precision Products | Cincinnati | OH | Machinery Manufacturing333513 | 20-99 | ◐ LIKELY ACTIVE |
| PIPremier Ink Systems | Harrison | OH | Chemical Manufacturing325910 | 20-99 | ◐ LIKELY ACTIVE |
| RAR. A. Heller Company | Woodlawn | OH | Fabricated Metal Product Manufacturing332812 | 1-19 | ◐ LIKELY ACTIVE |
| RRReading Rock INC | Union Township | OH | Nonmetallic Mineral Product Manufacturing327331 | 100-499 | ◐ LIKELY ACTIVE |
| RIRefrigeration Industries Corporation | South Point | OH | Machinery Manufacturing333415 | 1-19 | ◐ LIKELY ACTIVE |
| RCReliable Casting Corporation | Cincinnati | OH | Primary Metal Manufacturing331521 | 20-99 | ◐ LIKELY ACTIVE |
| RMReplex Mirror Company (0142000109) | Mount Vernon | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| RWRepublic Wire INC | West Chester | OH | Primary Metal Manufacturing331420 | 100-499 | ◐ LIKELY ACTIVE |
| RCRiceland Cabinet CORP (0285032001) | Wooster | OH | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| RIRichards Industrials INC | Cincinnati | OH | Fabricated Metal Product Manufacturing332813 | 100-499 | ◐ LIKELY ACTIVE |
| RERobin Enterprises CO | Westerville | OH | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| RCRoppe Corporation (0374010077) | Fostoria | OH | Plastics and Rubber Products Manufacturing326299 | 100-499 | ◐ LIKELY ACTIVE |
| SDSam Dong Ohio INC | Delaware | OH | Primary Metal Manufacturing331420 | 100-499 | ◐ LIKELY ACTIVE |
| SGSchilling's Graphics | Galion | OH | Miscellaneous Manufacturing339999 | 20-99 | ◐ LIKELY ACTIVE |
| SISchmelzer Industries, INC. (0664000064) | Somerset | OH | Textile Mills313210 | 20-99 | ◐ LIKELY ACTIVE |
| SIScottdel INC | Swanton | OH | Plastics and Rubber Products Manufacturing326150 | 20-99 | ◐ LIKELY ACTIVE |
| SMSheridan Millwork & Cabinetry, INC. | Cleveland | OH | Furniture and Related Product Manufacturing337110 | 1-19 | ◐ LIKELY ACTIVE |