 Ellwood Engineered Castings | Hubbard | 100–499 | ● ACTIVE |
| OSOhio Star Forge CO. | Champion | 100–499 | ● ACTIVE |
| BEBrt Extrusions INC | Niles | 100–499 | ● ACTIVE |
| RTRmi Titanium CO (0278060189) | Niles | — | ◐ LIKELY ACTIVE |
| TSThomas Steel Strip CORP | Warren | 100–499 | ◐ LIKELY ACTIVE |
| MUMatalco Usa, LLC | Lordstown | — | ◐ LIKELY ACTIVE |
| NCNovelis Corporation (0278080136) | Warren | — | ◐ LIKELY ACTIVE |
| BMBull Moose Tube CO - Masury Plant | Masury | — | ◇ UNVERIFIED |
| WTWheatland Tube - Warren, a Div. of Zekelman Industries (0278080757) | Warren | — | ◇ UNVERIFIED |
| TFTrumbull Foundry & Alloy | Niles | — | ◇ UNVERIFIED |
| ARAllegheny Rail Products/ Lb Foster CO | Niles | — | ◐ LIKELY ACTIVE |
| MSMcdonald Steel CORP | Mc Donald | — | ◐ LIKELY ACTIVE |
| TFTrumbull Foundry and Alloy Federal Street | Niles | 20–99 | ◐ LIKELY ACTIVE |
| WSWarren Steel Holdings LLC | Warren | — | ◐ LIKELY ACTIVE |
| TSThomas Steel Strip Corporation Tata Steel Plating | Warren | — | ◐ LIKELY ACTIVE |
| AWArcelormittal Warren | Warren | — | ◇ UNVERIFIED |
 Golden Aluminum Extrusions Warren, LLC | Warren | — | ◇ UNVERIFIED |
| IAIndalex Aluminum Solutions-girard Plant (0278020021) | Girard | — | ◇ UNVERIFIED |
| OVOhio Valley Aluminum C LLC Niles Facilit | Niles | — | ◇ UNVERIFIED |
| WTWheatland Tube CO Niles Plant | Niles | — | ◇ UNVERIFIED |
| BMBMT Masury | Masury | 20–99 | ◐ LIKELY ACTIVE |
| JIJackson International Inc DBA Jaxon | Mineral Ridge | 20–99 | ◐ LIKELY ACTIVE |
| KSKartal Services Group INC | Hubbard | — | ◐ LIKELY ACTIVE |
| NZNiles Zekelman Industries | Niles | 20–99 | ◐ LIKELY ACTIVE |
| PMPhillips Manufacturing Niles | Niles | 20–99 | ◐ LIKELY ACTIVE |
| TFTrumbull Foundry and Alloy Henry Street | Niles | 1–19 | ◐ LIKELY ACTIVE |
| WTWheatland Tube Warren | Warren | 100–499 | ◐ LIKELY ACTIVE |
| ATAlcoa Titanium & Engineered Products (atep) | Niles | — | ◇ UNVERIFIED |
| BWBdm Warren Steel Operations, LLC (0278000463) | Warren | — | ◇ UNVERIFIED |
| DADelphi Automotive Systems LLC | Warren | — | ◇ UNVERIFIED |
| MIMidwest Industrial Contract Services, LLC | Girard | — | ◇ UNVERIFIED |
| MSMobile Skids INC. | Brookfield | — | ◇ UNVERIFIED |
| RIRti International Metals, INC | Niles | — | ◇ UNVERIFIED |
| TDTherm-o-link Dba Vulkor INC. | Warren | — | ◇ UNVERIFIED |
| TITmk Ipsco | Brookfield | — | ◇ UNVERIFIED |
| WSWarren Steel Holdings, LLC (0278080015) | Warren | — | ◇ UNVERIFIED |
