| OVOhio Valley Stamping-assemblies INC. | Mansfield | — | ◇ UNVERIFIED |
| OCO'keefe Casting | Lorain | — | ◇ UNVERIFIED |
| OPOptions Plus, INC. | Fredericktown | — | ◇ UNVERIFIED |
| OAOrmet Aluminum Mill Products Corporation (0656000014) | Hannibal | — | ◇ UNVERIFIED |
| PWPaul Wilke & Son, INC. | Cincinnati | — | ◇ UNVERIFIED |
| PCP C Campana | Canton | — | ◇ UNVERIFIED |
| PFPenny Fabrication | Johnstown | — | ◇ UNVERIFIED |
| PUPetmin USA Incorporated (0204012023) | Ashtabula | — | ◇ UNVERIFIED |
| PMPhillips Mfg.& Tower CO Dba Shelby Welded Tube | Shelby | — | ◇ UNVERIFIED |
| PTPhillips Tube Group | Shelby | — | ◇ UNVERIFIED |
| PFPrototype Fabricators Co. | Cleveland | — | ◇ UNVERIFIED |
| PHPtc Holdings Group | Alliance | — | ◇ UNVERIFIED |
| QMQuality Mold INC. | Akron | — | ◇ UNVERIFIED |
| RMRAM Machining, Inc. | Washington Courth House | — | ◇ UNVERIFIED |
| RAReal Alloy Specialty Products INC | Rock Creek | — | ◇ UNVERIFIED |
| RDReebar Die Casting INC. | Waterville | — | ◇ UNVERIFIED |
| RHRFH Holdings LLC | Hamilton | — | ◇ UNVERIFIED |
| RMRichard Mills | Medina | — | ◇ UNVERIFIED |
| RARoss Aluminum Foundries Ii | Sidney | — | ◇ UNVERIFIED |
| RCRoss Casting & Innovation, LLC | Sidney | — | ◇ UNVERIFIED |
| RCRoss Cast Metals | Lancaster | — | ◇ UNVERIFIED |
| RTRr Traders & Import Export LLC | Lewis Center | — | ◇ UNVERIFIED |
| RIRti International Metals, INC | Niles | — | ◇ UNVERIFIED |
| SBSeville Bronze | Seville | — | ◇ UNVERIFIED |
| SASeyekcub Aluminum | Uhrichsville | — | ◇ UNVERIFIED |
| SCShape CORP | Trenton | — | ◇ UNVERIFIED |
| SMShardy Machine Services LLC | Burghill | — | ◇ UNVERIFIED |
| SSSheffield Steel Products INC | Macedonia | — | ◇ UNVERIFIED |
| SASlob and Sons Pipe & Casing, INC. | Marion | — | ◇ UNVERIFIED |
| SISolsil Incorporated (0684000225) | Beverly | — | ◇ UNVERIFIED |
| SPSst Precision Manufacturing INC. | Loveland | — | ◇ UNVERIFIED |
| SCSteel Ceilings INC | Johnstown | — | ◇ UNVERIFIED |
| SPSterling Pipe & Tube, INC. | Toledo | — | ◇ UNVERIFIED |
| SSSteven Steel Supply | Columbus | — | ◇ UNVERIFIED |
| SPStructure Personnel INC. | Seville | — | ◇ UNVERIFIED |
| SSSummit Steel Corporation | Chagrin Falls | — | ◇ UNVERIFIED |
| THThe Hamilton Brass & Aluminum Casting CO. | Hamilton | — | ◇ UNVERIFIED |
| TDTherm-o-link Dba Vulkor INC. | Warren | — | ◇ UNVERIFIED |
| TTThe Timken Company | Canton | — | ◇ UNVERIFIED |
| TTThe Timken Steel Corporation | Canton | — | ◇ UNVERIFIED |
| TTThe Timkensteel Corporation | Canton | — | ◇ UNVERIFIED |
| TWThe Wilmington Iron and Metal Company, Inc. | Wilmington | — | ◇ UNVERIFIED |
 The Worthington Steel Company (1318178701) | Cuyahoga Heights | — | ◇ UNVERIFIED |
| TITimcor, INC | Defiance | — | ◇ UNVERIFIED |
| TCTimkensteel Corporation | Canton | — | ◇ UNVERIFIED |
| TITmk Ipsco | Brookfield | — | ◇ UNVERIFIED |
| TMTomco Machining INC | Dayton | — | ◇ UNVERIFIED |
| TMTpc Metals LLC | Bryan | — | ◇ UNVERIFIED |
| TMTpc Metals, LLC | Canton | — | ◇ UNVERIFIED |
| TNTubetech North America, INC. | E Palestine | — | ◇ UNVERIFIED |
