| ACAmerican Casting | Pryor | 100–499 | ● ACTIVE |
| BMBison Metals Technologies LLC | Shawnee | 100–499 | ● ACTIVE |
| EAEj Ardmore Inc- Foundry | Ardmore | 100–499 | ● ACTIVE |
M-d Building Products, INC. | Oklahoma City | 500+ | ● ACTIVE |
| UOUmicore Optical Materials USA INC. | Quapaw | 20–99 | ● ACTIVE |
Ddb Ulimited INC | Pauls Valley | 20–99 | ● ACTIVE |
| DRDub Ross Company, INC. | Oklahoma City | — | ● ACTIVE |
Expanded Solutions LLC | Wewoka | — | ● ACTIVE |
| ASAlbright Steel & Wire CO | Oklahoma City | — | ● ACTIVE |
Ground Zero Shelters CO. | Perry | — | ● ACTIVE |
Parrish Enterprises, LTD. | Enid | — | ● ACTIVE |
| PSPatriot Steel LLC | Harrah | — | ● ACTIVE |
U.s. Aluminum Company, LLC | Oklahoma City | — | ● ACTIVE |
Webco Industries, INC. | Sand Springs | — | ● ACTIVE |
Westwin Elements, INC. | Oklahoma City | — | ● ACTIVE |
| MAMid American Steel and Wire CO - Mill | Madill | 100–499 | ◐ LIKELY ACTIVE |
| RAReal Alloy Recycling LLC | Sapulpa | 20–99 | ◐ LIKELY ACTIVE |
Webco Industries INC Kellyville Specialty Tube | Kellyville | 100–499 | ◐ LIKELY ACTIVE |
Webco Industries, INC. Ok Dist. Div | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
Blue Whale Materials LLC | Bartlesville | 20–99 | ◐ LIKELY ACTIVE |
| CSCmc Steel Oklahoma | Durant | 100–499 | ◐ LIKELY ACTIVE |
| DSDw-national Standard-stillwater LLC | Stillwater | — | ◐ LIKELY ACTIVE |
| SSSand Springs | Sand Springs | — | ◐ LIKELY ACTIVE |
| TDTubacex Durant INC. | Durant | 20–99 | ◐ LIKELY ACTIVE |
| WIWebco Industries, Star Center Tube | Sand Springs | — | ◐ LIKELY ACTIVE |
| CFClaremore Faclty | Claremore | — | ◐ LIKELY ACTIVE |
| JZJohn Zink Apache Facility | Tulsa | — | ◐ LIKELY ACTIVE |
| SUStarpipe USA Dba Sp Foundry / Sp Foundry | South Coffeyville | — | ◐ LIKELY ACTIVE |
| VSVallourec Star LP / Muskogee Plt | Muskogee | — | ◐ LIKELY ACTIVE |
| AIAlpha Investment Casting CORP / Alpha Investment Casting CORP | Tulsa | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group / American Alloy Ii | Muskogee | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group LLC - Bixby | Bixby | — | ◇ UNVERIFIED |
| ARArk Ramos Foundry & Manufacturing CO INC | Oklahoma City | — | ◇ UNVERIFIED |
| GIGray Iron Fndry | Blackwell | — | ◇ UNVERIFIED |
| NONational Oilwell Varco/tulsa Multiplex | Tulsa | — | ◇ UNVERIFIED |
| OIOklahoma Investment Casting CO | Blackwell | — | ◇ UNVERIFIED |
| PCPt Central Machine and Tool Company | Enid | — | ◇ UNVERIFIED |
| SASlw Automotive INC / Sallisaw Plt | Sallisaw | — | ◇ UNVERIFIED |
| SWSouthwestern Wire, INC. | Norman | — | ◇ UNVERIFIED |
| TCThe Crucible LLC | Norman | — | ◇ UNVERIFIED |
| TFTonkawa Foundry INC / Tonkawa Foundry | Tonkawa | — | ◇ UNVERIFIED |
| VNValmont Newmark | Tulsa | — | ◇ UNVERIFIED |
Webco Industries, INC. Mannford Specialty Tube | Mannford | — | ◇ UNVERIFIED |
Webco Industries, INC. Swt Cooper Bldg | Sand Springs | — | ◇ UNVERIFIED |
| ASAcs Steel Co., LLC | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| COCity of Quapaw Potw | Quapaw | — | ◐ LIKELY ACTIVE |
| LALos Angeles Boiler Works Inc. | Blackwell | 20–99 | ◐ LIKELY ACTIVE |
| OSOps Sales Company | Dewey | 100–499 | ◐ LIKELY ACTIVE |
| PPPelco Products INC. | Edmond | 100–499 | ◐ LIKELY ACTIVE |
| TFTaylor Forge Engineered Systems Tulsa | Tulsa | 20–99 | ◐ LIKELY ACTIVE |