| 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. | Cleveland | OH | Machinery Manufacturing333517 | — | ◐ LIKELY ACTIVE |
| LELincoln Electric Automation, INC. | Coldwater | OH | Machinery Manufacturing333514 | — | ◐ 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 |
| MLMettler-Toledo, LLC (US-MO Division) | Columbus | OH | Machinery Manufacturing333997 | 500+ | ◐ 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 |
| MIMoog INC. | Orrville | OH | Machinery Manufacturing333995 | — | ◐ LIKELY ACTIVE |
| MMMoog Military Aircraft LLC | Orrville | OH | Machinery Manufacturing333995 | — | ◐ 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 |
| MSMotion Systems St. Marys | St. 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 |
| NCNorth Central Assemblies LLC | Shiloh | OH | Machinery Manufacturing333112 | — | ◐ 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 |
| OOh11-cin-cincinnati | Cincinnati | OH | Machinery Manufacturing333515 | 20-99 | ◐ LIKELY ACTIVE |
| OFOhio Factory | Ravenna | OH | Machinery Manufacturing333911 | 20-99 | ◐ LIKELY ACTIVE |
| OHOhio Hickory Harvest Brand Product Inc. | Akron | OH | Machinery Manufacturing333241 | 100-499 | ◐ LIKELY ACTIVE |
| OSOhio - Superior Diesel | Seville | OH | Machinery Manufacturing333618 | 20-99 | ◐ LIKELY ACTIVE |
| OWOHIO Warehouse Operations | Troy | OH | Machinery Manufacturing333992 | 20-99 | ◐ LIKELY ACTIVE |
| OOlan | Canal Winchester | OH | Machinery Manufacturing333249 | 1-19 | ◐ LIKELY ACTIVE |
| OOrwell | Orwell | OH | Machinery Manufacturing333515 | 100-499 | ◐ LIKELY ACTIVE |
| OUOSG USA, Inc., Cold Forming Division | Parma | OH | Machinery Manufacturing333517 | 20-99 | ◐ LIKELY ACTIVE |
| PCParker-hannifin Corporation | Metamora | OH | Machinery Manufacturing333998 | — | ◐ LIKELY ACTIVE |
| PAPCC Airfoils Mold Masters International | Eastlake | OH | Machinery Manufacturing333511 | 100-499 | ◐ LIKELY ACTIVE |
| PAPCC Airfoils Painesville | Painesville | OH | Machinery Manufacturing333611 | 20-99 | ◐ LIKELY ACTIVE |
| PUPe Usa, INC. | Cincinnati | OH | Machinery Manufacturing333993 | 20-99 | ◐ LIKELY ACTIVE |
| PPPlaster Process Casting Co. dba Diversified Mold & Castings | Warrensville Heights | OH | Machinery Manufacturing333511 | 20-99 | ◐ LIKELY ACTIVE |
| PSPneumatic Scale Angelus | Cuyahoga Falls | OH | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |
| PSPneumatic Scale Angelus - Stow | Stow | OH | Machinery Manufacturing333993 | 100-499 | ◐ LIKELY ACTIVE |