| KTKiraly Tool and Die, Inc. | Youngstown | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| KPKraton Polymers U.s. LLC | Belpre | OH | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| KTKuka Toledo Production Operations | Toledo | OH | Transportation Equipment Manufacturing336320 | 100-499 | ◐ LIKELY ACTIVE |
| KIKurz-kasch INC | Newcomerstown | OH | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| KMKuttler Machine | Minerva | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| KIKyntronics INC | Solon | OH | Machinery Manufacturing333995 | 1-19 | ◐ LIKELY ACTIVE |
| LCLake City Plating Plant 1 | Ashtabula | OH | Fabricated Metal Product Manufacturing332813 | 20-99 | ◐ LIKELY ACTIVE |
| LILakepark Industries INC | Greenwich | OH | Transportation Equipment Manufacturing336370 | 100-499 | ◐ LIKELY ACTIVE |
| LOLand O'lakes Kent | Kent | OH | Food Manufacturing311225 | 100-499 | ◐ LIKELY ACTIVE |
| LCL.E.Smith Company, LLC | Bryan | OH | Furniture and Related Product Manufacturing337110 | 20-99 | ◐ LIKELY ACTIVE |
| LPLhy Powertrain | Canfield | OH | Machinery Manufacturing333996 | 20-99 | ◐ LIKELY ACTIVE |
| LCLogan Clay Products CO | Logan | OH | Nonmetallic Mineral Product Manufacturing327120 | 20-99 | ◐ LIKELY ACTIVE |
| LILoroco Industries INC | Cincinnati | OH | Paper Manufacturing322121 | 20-99 | ◐ LIKELY ACTIVE |
| LSLubrication Specialties | Mt. Gilead | OH | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| LNLynx Napoleon Spring Works | Archbold | OH | Fabricated Metal Product Manufacturing332321 | 100-499 | ◐ LIKELY ACTIVE |
| LALyondellbasell Advanced Polymers INC | Akron | OH | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MRMaag Reduction | Kent | OH | Machinery Manufacturing333248 | 20-99 | ◐ LIKELY ACTIVE |
| MIMack Iron Works CO | Sandusky | OH | Fabricated Metal Product Manufacturing332313 | 20-99 | ◐ LIKELY ACTIVE |
| MMMagna Machine CO. | Cincinnati | OH | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| MMMagnum Magnetics Corporation | Marietta | OH | Fabricated Metal Product Manufacturing332510 | — | ◐ LIKELY ACTIVE |
| MEMagnus Engineered Equipment LLC | Willoughby | OH | Chemical Manufacturing325612 | 1-19 | ◐ LIKELY ACTIVE |
| MBMahle Behr Mt Sterling INC | Mount Sterling | OH | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| MEMahle Engine Components USA INC | Mcconnelsville | OH | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
Mainstream Waterjet, LLC | Loveland | OH | Fabricated Metal Product Manufacturing332312 | 20-99 | ◐ LIKELY ACTIVE |
| MMMajor Metals Company | Mansfield | OH | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| MMancor | Dayton | OH | Primary Metal Manufacturing331512 | 100-499 | ◐ LIKELY ACTIVE |
| MSMarik Spring, INC. | Tallmadge | OH | Fabricated Metal Product Manufacturing332611 | 20-99 | ◐ LIKELY ACTIVE |
| MUMatalco Usa, LLC | Lordstown | OH | Primary Metal Manufacturing331314 | 500+ | ◐ LIKELY ACTIVE |
| MBMaterion Brush INC | Lorain | OH | Primary Metal Manufacturing331314 | 20-99 | ◐ LIKELY ACTIVE |
| MCMayco Colors | Hilliard | OH | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| MIMayfran International INC | Cleveland | OH | Machinery Manufacturing333922 | 100-499 | ◐ LIKELY ACTIVE |
| MPMccann Plastics, INC. | North Canton | OH | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MSMcdonald Steel CORP | Mc Donald | OH | Primary Metal Manufacturing331111 | 1-19 | ◐ LIKELY ACTIVE |
| MAMeggitt Aircraft Braking Systems Corporation | Akron | OH | Transportation Equipment Manufacturing336413 | — | ◐ LIKELY ACTIVE |
| MWMetal & Wire Products CO. | Salem | OH | Fabricated Metal Product Manufacturing332116 | 20-99 | ◐ LIKELY ACTIVE |
| MPMeyer Products LLC (1318001982) | Cleveland | OH | Machinery Manufacturing333120 | 100-499 | ◐ LIKELY ACTIVE |
| MBMiba Bearings US LLC | Mc Connelsville | OH | Primary Metal Manufacturing331314 | 500+ | ◐ LIKELY ACTIVE |
| MIMichelman INC | Cincinnati | OH | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| MMMicro Metal Finishing, LLC | Cincinnati | OH | Fabricated Metal Product Manufacturing332813 | 1-19 | ◐ LIKELY ACTIVE |
| MPMiddlefield Pallet Incorporated | Middlefield | OH | Wood Product Manufacturing321920 | 20-99 | ◐ LIKELY ACTIVE |
| MSMid States Packaging INC. | Lewistown | OH | Paper Manufacturing322221 | 20-99 | ◐ LIKELY ACTIVE |
| MEMidwest Elastomers INC | Wapakoneta | OH | Chemical Manufacturing325212 | 20-99 | ◐ LIKELY ACTIVE |
| MWMid West Fabricating - Amanda | Amanda | OH | Fabricated Metal Product Manufacturing332618 | 100-499 | ◐ LIKELY ACTIVE |
| MFMidwest Fasteners, INC | Miamisburg | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ◐ LIKELY ACTIVE |
| MFMid-west Forge CORP | Cleveland | OH | Fabricated Metal Product Manufacturing332111 | 100-499 | ◐ LIKELY ACTIVE |
| MEMitsubishi Electric Automotive America (1483090295) | Mason | OH | Transportation Equipment Manufacturing336310 | 100-499 | ◐ LIKELY ACTIVE |
| MNMobis North America, LLC | Toledo | OH | Transportation Equipment Manufacturing336110 | 100-499 | ◐ LIKELY ACTIVE |
| MWMock Woodworking CO. | Zanesville | OH | Wood Product Manufacturing321999 | 20-99 | ◐ LIKELY ACTIVE |
| MPMondo Polymer Technologies | Reno | OH | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| MTMorgan Truck Body LLC (0285010292) | Orrville | OH | Machinery Manufacturing333120 | 100-499 | ◐ LIKELY ACTIVE |