| KKtp | Valley View | OH | Machinery Manufacturing333517 | 20-99 | ◐ LIKELY ACTIVE |
| KIKyntronics INC | Solon | OH | Machinery Manufacturing333995 | — | ◐ LIKELY ACTIVE |
| LTLahm- Trosper, INC. | Dayton | OH | Machinery Manufacturing333514 | — | ◐ LIKELY ACTIVE |
| LLancaster | Lancaster | OH | Machinery Manufacturing333413 | 100-499 | ◐ LIKELY ACTIVE |
| L3Latitude 36 Foods 230 | Fairfield | OH | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| LDLau Dayton | Dayton | OH | Machinery Manufacturing333413 | 20-99 | ◐ LIKELY ACTIVE |
| LELevan Enterprises Inc. | Stow | OH | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| LSLife Sciences - Americas : MFG-Marietta, OH-USA | Marietta | OH | Machinery Manufacturing333415 | 20-99 | ◐ LIKELY ACTIVE |
| LELima Engine | Lima | OH | Machinery Manufacturing333618 | 500+ | ◐ LIKELY ACTIVE |
| LELincoln Electric Automation Coldwater | Coldwater | OH | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| LELincoln Electric Automation Columbus | Columbus | OH | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| LELincoln Electric Automation, INC. | Coldwater | OH | Machinery Manufacturing333514 | — | ◐ LIKELY ACTIVE |
| LELincoln Electric Holdings INC | Cleveland | OH | Machinery Manufacturing333992 | — | ◐ LIKELY ACTIVE |
| LILinde Inc. (formerly Praxair Inc.) Food Freezer Division | Wooster | OH | Machinery Manufacturing333415 | 20-99 | ◐ LIKELY ACTIVE |
| LALNS America | Cincinnati | OH | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| LILogitech, Inc. | Grove City | OH | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |
| MAMain Assembly | Marion | OH | Machinery Manufacturing333415 | 1-19 | ◐ LIKELY ACTIVE |
| MIMain I | Cleveland | OH | Machinery Manufacturing333414 | 20-99 | ◐ LIKELY ACTIVE |
| MIMain II | Cleveland | OH | Machinery Manufacturing333414 | 1-19 | ◐ LIKELY ACTIVE |
| MPMarblehead Plant | Marblehead | OH | Machinery Manufacturing333241 | 20-99 | ◐ LIKELY ACTIVE |
| MSMartin Sprocket & Gear 07 | Montpelier | OH | Machinery Manufacturing333613 | 100-499 | ◐ LIKELY ACTIVE |
| MOMason office | Mason | OH | Machinery Manufacturing333993 | 20-99 | ◐ LIKELY ACTIVE |
| MLMazzella Lifting Technologies (Westlake) | Westlake | OH | Machinery Manufacturing333923 | 20-99 | ◐ LIKELY ACTIVE |
| MPMD&A Parts OH | Marion | OH | Machinery Manufacturing333611 | 20-99 | ◐ LIKELY ACTIVE |
| MTMelin Tool Company | Cleveland | OH | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| MCMet Chem INC | Cleveland | OH | Machinery Manufacturing333310 | 20-99 | ◐ LIKELY ACTIVE |
| MLMettler-Toledo, LLC (US-MO Division) | Columbus | OH | Machinery Manufacturing333997 | 500+ | ◐ LIKELY ACTIVE |
| MBMiba Bearings US LLC | Mcconnelsville | OH | Machinery Manufacturing333613 | 100-499 | ◐ LIKELY ACTIVE |
| MCMiddletown CC AKS Steel | Middletown | OH | Machinery Manufacturing333923 | 20-99 | ◐ LIKELY ACTIVE |
| M3Minerva 3 D Creations LTD | Sidney | OH | Machinery Manufacturing333248 | — | ◐ LIKELY ACTIVE |
| MMMolten Metal Equipment Innovations LLC | Middlefield | OH | Machinery Manufacturing333911 | 20-99 | ◐ LIKELY ACTIVE |
| MPMonarch Products CO | Minerva | OH | Machinery Manufacturing333514 | — | ◐ LIKELY ACTIVE |
| MIMoog INC. | Orrville | OH | Machinery Manufacturing333995 | — | ◐ LIKELY ACTIVE |
| MMMoog Military Aircraft LLC | Orrville | OH | Machinery Manufacturing333995 | — | ◐ LIKELY ACTIVE |
| MPMorrison Products Cleveland | Cleveland | OH | Machinery Manufacturing333413 | 100-499 | ◐ LIKELY ACTIVE |
Motion Systems Marysville | Marysville | OH | Machinery Manufacturing333996 | 100-499 | ◐ LIKELY ACTIVE |
Motion Systems St. Marys | Saint Marys | OH | Machinery Manufacturing333995 | 100-499 | ◐ LIKELY ACTIVE |
Motion Systems Wadsworth | Wadsworth | OH | Machinery Manufacturing333995 | 20-99 | ◐ LIKELY ACTIVE |
| MPMTD Products DBA Stanley Black and Decker- Willard | Willard | OH | Machinery Manufacturing333112 | 500+ | ◐ LIKELY ACTIVE |
| MBMulti-Color Blue Ash | Blue Ash | OH | Machinery Manufacturing333244 | 20-99 | ◐ LIKELY ACTIVE |
| NMNA Mfg Dearborn | Columbus | OH | Machinery Manufacturing333415 | 20-99 | ◐ LIKELY ACTIVE |
| NMNA Mfg Ironton | Ironton | OH | Machinery Manufacturing333415 | 500+ | ◐ LIKELY ACTIVE |
| NBNational Blanking | Toledo | OH | Machinery Manufacturing333515 | 1-19 | ◐ LIKELY ACTIVE |
| NFNemco Food Equipment LTD | Hicksville | OH | Machinery Manufacturing333241 | 100-499 | ◐ LIKELY ACTIVE |
| NCNordson CORP | Westlake | OH | Machinery Manufacturing333998 | — | ◐ LIKELY ACTIVE |
| NCNorth Central Assemblies LLC | Shiloh | OH | Machinery Manufacturing333112 | — | ◐ LIKELY ACTIVE |
| NTNorthwestern Tools Inc. | Dayton | OH | Machinery Manufacturing333514 | 20-99 | ◐ LIKELY ACTIVE |
| NWNorwalk Wastewater Equipment Company DBA Norweco, Inc. | Norwalk | OH | Machinery Manufacturing333318 | 20-99 | ◐ LIKELY ACTIVE |
| NDNOV Dayton FMS | Dayton | OH | Machinery Manufacturing333249 | 100-499 | ◐ LIKELY ACTIVE |
| OIOcs Intellitrak | Fairfield | OH | Machinery Manufacturing333922 | 20-99 | ◐ LIKELY ACTIVE |