| PIParagon Industries, INC | Sapulpa | — | ◐ LIKELY ACTIVE |
| AIAlpha Investment Castings | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| OSOps Sales Company | Dewey | 100–499 | ◐ LIKELY ACTIVE |
| TFTaylor Forge Engineered Systems Tulsa | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| HCHorsehead Corp/bartlesville Div | Bartlesville | — | ◐ LIKELY ACTIVE |
| NANov Ameron Tulsa Pole Products Tube Manufacturing | Tulsa | — | ◐ LIKELY ACTIVE |
| NANov Ameron Tulsa Pole Products Welding & Fabrication | Tulsa | — | ◐ LIKELY ACTIVE |
| YIYaffe Iron and Metal CO - Muskogee | Muskogee | — | ◐ LIKELY ACTIVE |
| 2S2300 S Hwy 97 | Sand Springs | — | ◇ UNVERIFIED |
| BFBig Four Foundries CORP | Tulsa | — | ◇ UNVERIFIED |
| BCBorg Compressed Steel CORP | Tulsa | — | ◇ UNVERIFIED |
| EAEj Ardmore INC | Ardmore | — | ◇ UNVERIFIED |
| EBElectron Blackwell | Blackwell | — | ◇ UNVERIFIED |
| ECEmpire Casting - Tulsa Gray Iron Fndry | Tulsa | — | ◇ UNVERIFIED |
| FGFascast Gray Iron Foundary | Tulsa | — | ◇ UNVERIFIED |
| FIFmri, INC. | Muskogee | — | ◇ UNVERIFIED |
| FAFrailey Alloys / Frailey Alloys | Chouteau | — | ◇ UNVERIFIED |
| GAGerdau Ameristeel - Sand Springs Facility | Sand Springs | — | ◇ UNVERIFIED |
| PIParagon Industries INC / Paragon Industries INC | Sapulpa | — | ◇ UNVERIFIED |
| SFSequoyah Fuels Corporation | Gore | — | ◇ UNVERIFIED |
Webco Industries, INC. Keystone | Sand Springs | — | ◇ UNVERIFIED |
| BMBri-Steel Manufacturing LLC | Enid | 20–99 | ◐ LIKELY ACTIVE |
| MMct | Sallisaw | 20–99 | ◐ LIKELY ACTIVE |
| OSOKC - Southwest Tube | Sand Springs | 100–499 | ◐ LIKELY ACTIVE |
| OSOKC - Star Center Tube | Sand Springs | 100–499 | ◐ LIKELY ACTIVE |
| PFPT Foundry | Eind | 20–99 | ◐ LIKELY ACTIVE |
| SSSaber Steel, LLC | Tulsa | 1–19 | ◐ LIKELY ACTIVE |
| SWSouthwestern Wire, Inc. Tulsa | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| SFSP Foundry | South Coffeyville | 100–499 | ◐ LIKELY ACTIVE |
| ATAllen Technologies LLC | Tulsa | 1–19 | ◇ UNVERIFIED |
| DRDuncan Recycling and Refining LLC | Duncan | — | ◇ UNVERIFIED |