| MSMt Systems, INC | Canton | OH | Machinery Manufacturing333249 | 20-99 | ◐ LIKELY ACTIVE |
| MCMulti-cast CORP | Wauseon | OH | Primary Metal Manufacturing331521 | 20-99 | ◐ LIKELY ACTIVE |
Myers Controlled Power, LLC | North Canton | OH | Electrical Equipment, Appliance & Component Manufacturing335313 | 100-499 | ◐ LIKELY ACTIVE |
| NINagalv-ohio, INC | Canton | OH | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| NSNanofiber Solutions LLC | Dublin | OH | Plastics and Rubber Products Manufacturing326199 | 1-19 | ◐ LIKELY ACTIVE |
| NPNational Plating Corporation | Cleveland | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| NPNestle Purina Petcare | Zanesville | OH | Food Manufacturing311111 | 100-499 | ◐ LIKELY ACTIVE |
| NUNestle USA Food Frozen Prepared Foods | Solon | OH | Food Manufacturing311412 | — | ◐ LIKELY ACTIVE |
| NANeturen America Corporation | Hamilton | OH | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
| NTNew Tech Plastics INC | Covington | OH | Plastics and Rubber Products Manufacturing326111 | 20-99 | ◐ LIKELY ACTIVE |
| NBNortheast Box CO | Ashtabula | OH | Paper Manufacturing322211 | 20-99 | ◐ LIKELY ACTIVE |
| NMNorthern Manufacturing | Oak Harbor | OH | Fabricated Metal Product Manufacturing332312 | 100-499 | ◐ LIKELY ACTIVE |
| NSNovagard Solutions INC | Cleveland | OH | Petroleum and Coal Products Manufacturing324191 | 100-499 | ◐ LIKELY ACTIVE |
| OAOhio Aluminum Industries INC. | Cleveland | OH | Primary Metal Manufacturing331524 | 100-499 | ◐ LIKELY ACTIVE |
| OPOhio Pickling & Processing | Toledo | OH | Primary Metal Manufacturing331221 | 100-499 | ◐ LIKELY ACTIVE |
| OSOhio Steel Industries | Columbus | OH | Machinery Manufacturing333112 | 20-99 | ◐ LIKELY ACTIVE |
| OVOhio Valley Manufacturing | Mansfield | OH | Fabricated Metal Product Manufacturing332119 | 100-499 | ◐ LIKELY ACTIVE |
| OSOlympic Steel | Bedford Heights | OH | Primary Metal Manufacturing331221 | 500+ | ◐ LIKELY ACTIVE |
| OMOmni Manufacturing INC | St Marys | OH | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| OIOsco Industries INC - Jackson Div | Jackson | OH | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| OKOtto Konigslow Mfg. CO the | Cleveland | OH | Fabricated Metal Product Manufacturing332119 | 1-19 | ◐ LIKELY ACTIVE |
| PMPacific Manufacturing | Fairfield | OH | Transportation Equipment Manufacturing336370 | 500+ | ◐ LIKELY ACTIVE |
| PAP & a Industries | Findlay | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| PPPaxos Plating CO | Canton | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| PAPcc Airfoils LLC | Crooksville | OH | Transportation Equipment Manufacturing336412 | 100-499 | ◐ LIKELY ACTIVE |
| PVPearl Valley Cheese | Fresno | OH | Food Manufacturing311513 | 20-99 | ◐ LIKELY ACTIVE |
| PSPeerless Saw | Groveport | OH | Fabricated Metal Product Manufacturing332216 | 20-99 | ◐ LIKELY ACTIVE |
| PMPennant Moldings INC | Sabina | OH | Fabricated Metal Product Manufacturing332114 | 100-499 | ◐ LIKELY ACTIVE |
| PIPentaflex, INC. | Springfield | OH | Machinery Manufacturing333513 | 20-99 | ◐ LIKELY ACTIVE |
| PSPixelle Specialty Solutions LLC (0671010028) | Chillicothe | OH | Paper Manufacturing322120 | — | ◐ LIKELY ACTIVE |
| PDPolychem Dispersions INC | Middlefield | OH | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
Potesta and Company LLC | Hudson | OH | Fabricated Metal Product Manufacturing332991 | 20-99 | ◐ LIKELY ACTIVE |
| PIPotters Industries INC Cleveland | Cleveland | OH | Nonmetallic Mineral Product Manufacturing327215 | 20-99 | ◐ LIKELY ACTIVE |
Powder Alloy CORP | Loveland | OH | Primary Metal Manufacturing331410 | — | ◐ LIKELY ACTIVE |
| PPPratt Paper (oh), LLC | Wapakoneta | OH | Paper Manufacturing322121 | 100-499 | ◐ LIKELY ACTIVE |
| PPPrecision Production, INC. | Strongsville | OH | Fabricated Metal Product Manufacturing332721 | 20-99 | ◐ LIKELY ACTIVE |
| PBPremier Building Solutions INC | Massillon | OH | Chemical Manufacturing325520 | 20-99 | ◐ LIKELY ACTIVE |
| PPPrimary Packaging INC (0679000276) | Bolivar | OH | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| PDProduction Design Services INC | Dayton | OH | Machinery Manufacturing333298 | 100-499 | ◐ LIKELY ACTIVE |
Production Paint Finishers INC | Bradford | OH | Fabricated Metal Product Manufacturing332812 | 20-99 | ◐ LIKELY ACTIVE |
| PPProduction Products INC. | Columbus Grove | OH | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| PTProduction Tube Cutting | Dayton | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| PPProgressive Printers | Dayton | OH | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| PSProgressive Stamping INC | Ottoville | OH | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| QSQuality Steel Corporation of Ms | Fremont | OH | Fabricated Metal Product Manufacturing332313 | 100-499 | ◐ LIKELY ACTIVE |
| QIQuickdraft INC | Canton | OH | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
| RWRace Winning Brands | Mentor | OH | Fabricated Metal Product Manufacturing332112 | 100-499 | ◐ LIKELY ACTIVE |
| RPRadici Plastics USA INC. | Wadsworth | OH | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| RCRage Corporation | Hilliard | OH | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
| RPRam Precision Industries, Inc | Centerville | OH | Miscellaneous Manufacturing339911 | 20-99 | ◐ LIKELY ACTIVE |