| SMSt Marys Foundry | Saint Marys | OH | Primary Metal Manufacturing331511 | 100-499 | ◐ LIKELY ACTIVE |
| 4E45qua Emery Cutter & Foundry Co.,inc. Dba Piqua Em | Piqua | OH | Primary Metal Manufacturing331524 | 20-99 | ◐ LIKELY ACTIVE |
| AMAlumalloy Metalcasting CO. | Avon Lake | OH | Primary Metal Manufacturing331524 | 1-19 | ◐ LIKELY ACTIVE |
| AHAmerican Highway Products, LTD | Bolivar | OH | Primary Metal Manufacturing331210 | 1-19 | ◐ LIKELY ACTIVE |
| BMBarclay Machine, INC. | Salem | OH | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| CUCastings USA INC | New Philadelphia | OH | Primary Metal Manufacturing331511 | 1-19 | ◐ LIKELY ACTIVE |
| GAG a Avril CO - White Metal Prods Div | Cincinnati | OH | Primary Metal Manufacturing331492 | 1-19 | ◐ LIKELY ACTIVE |
| JSJsw Steel USA Ohio, INC. | Mingo Junction | OH | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| KFKuhn Fabricating Inc. | Lorain | OH | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| MUMatalco USA LLC | Canton | OH | Primary Metal Manufacturing331314 | 100-499 | ◐ LIKELY ACTIVE |
| MPMcm Precision Castings INC | Weston | OH | Primary Metal Manufacturing331528 | 1-19 | ◐ LIKELY ACTIVE |
| MTMiddletown Tube Works INC | Middletown | OH | Primary Metal Manufacturing331111 | 20-99 | ◐ LIKELY ACTIVE |
| PTPhillips Tube Group | Shelby | OH | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| RDReebar Die Casting INC. | Waterville | OH | Primary Metal Manufacturing331523 | 1-19 | ◐ LIKELY ACTIVE |
| UTUnity Tube, Inc. | East Palestine | OH | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| YSYoungstown Specialty Metls INC | Youngstown | OH | Primary Metal Manufacturing331221 | 1-19 | ◐ LIKELY ACTIVE |
| ABA & B Foundry & Machining | Franklin | OH | Primary Metal Manufacturing331524 | 20-99 | ◇ UNVERIFIED |
| AWAluminum Wheel Technologies INC | Ravenna | OH | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| ASAmerican Steel Fabricators, LLC | Springfield | OH | Primary Metal Manufacturing331110 | 1-19 | ◇ UNVERIFIED |
| AWArcelormittal Warren | Warren | OH | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| APAvalon Precision Metalsmiths | Cleveland | OH | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| BSBarberton Steel Industries, INC. | Barberton | OH | Primary Metal Manufacturing331513 | 20-99 | ◇ UNVERIFIED |
| CMCast Metals INC | Deshler | OH | Primary Metal Manufacturing331511 | 1-19 | ◇ UNVERIFIED |
| CMCast Metals Technology | Union | OH | Primary Metal Manufacturing331525 | 20-99 | ◇ UNVERIFIED |
| HBHamilton Brass & Aluminum Castings CO | Hamilton | OH | Primary Metal Manufacturing331521 | 1-19 | ◇ UNVERIFIED |
| IHI H Schlezinger INC | Columbus | OH | Primary Metal Manufacturing331492 | 20-99 | ◇ UNVERIFIED |
| MTMid-ohio Tubing LLC | Butler | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OEOpw Engineered Systems | Lebanon | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SRSeneca Railroad & Mining | Bellevue | OH | Primary Metal Manufacturing331110 | 1-19 | ◇ UNVERIFIED |
| SSSewah Studios | Marietta | OH | Primary Metal Manufacturing331524 | 20-99 | ◇ UNVERIFIED |
| TFTrumbull Foundry & Alloy | Niles | OH | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| WPWm. Powell Valve CO. | Cincinnati | OH | Primary Metal Manufacturing331528 | 20-99 | ◇ UNVERIFIED |
| XFXenia Foundry | Xenia | OH | Primary Metal Manufacturing331511 | 20-99 | ◇ UNVERIFIED |
| ARAllegheny Rail Products/ Lb Foster CO | Niles | OH | Primary Metal Manufacturing331111 | — | ◐ LIKELY ACTIVE |
| AVAmg Vanadium LLC | Zanesville | OH | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| ARAmsted Rail | Groveport | OH | Primary Metal Manufacturing331513 | 100-499 | ◐ LIKELY ACTIVE |
| BSByer Steel | Cincinnati | OH | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CSCleveland-Cliffs Steel Research & Innovation Center | Middletown | OH | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| CCCol-Pump Company | Columbiana | OH | Primary Metal Manufacturing331513 | 20-99 | ◐ LIKELY ACTIVE |
| CBCoopermill Bronzeworks LTD | Zanesville | OH | Primary Metal Manufacturing331529 | 1-19 | ◐ LIKELY ACTIVE |
| CECore-tech Enterprises, LLC | Mentor | OH | Primary Metal Manufacturing331492 | 20-99 | ◐ LIKELY ACTIVE |
| CICore-Tech, Inc. | Mentor | OH | Primary Metal Manufacturing331492 | 20-99 | ◐ LIKELY ACTIVE |
| CHCustom Hoists | Ashland | OH | Primary Metal Manufacturing331110 | 20-99 | ◐ LIKELY ACTIVE |
| ETEpix Tube Company, Inc. | Dayton | OH | Primary Metal Manufacturing331110 | 100-499 | ◐ LIKELY ACTIVE |
| FRFort Recovery Industries Inc | Ft. Recovery | OH | Primary Metal Manufacturing331523 | 100-499 | ◐ LIKELY ACTIVE |
| GAGeneral Aluminum LLC, Ravenna | Ravenna | OH | Primary Metal Manufacturing331523 | 100-499 | ◐ LIKELY ACTIVE |
| GDGeneral Die Casters, Inc. Peninsula | Peninsula | OH | Primary Metal Manufacturing331521 | 1-19 | ◐ LIKELY ACTIVE |
| GLGeneva Liberty Steel | Youngstown | OH | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |
| GEGuardian Express INC | Wapakoneta | OH | Primary Metal Manufacturing331314 | — | ◐ LIKELY ACTIVE |
| HCHaydon Corporation- OH | Stow | OH | Primary Metal Manufacturing331221 | 20-99 | ◐ LIKELY ACTIVE |