| TFTonkawa Foundry, Inc | Tonkawa | 20–99 | ◐ LIKELY ACTIVE |
| HCHorsehead Corp/bartlesville Div | Bartlesville | — | ◐ 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 |
| 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 |
 Metal Dynamics CORP / Ferrous and Non Ferrous Foundry | Tulsa | — | ◇ UNVERIFIED |
| NANov Ameron Tulsa Pole Products Tube Manufacturing | Tulsa | — | ◇ UNVERIFIED |
| NANov Ameron Tulsa Pole Products Welding & Fabrication | Tulsa | — | ◇ UNVERIFIED |
| PIParagon Industries, INC | Sapulpa | — | ◇ UNVERIFIED |
| PIParagon Industries INC / Paragon Industries INC | Sapulpa | — | ◇ UNVERIFIED |
| PBProgressive Brass Mfg CO / Progressive Brass Mfg CO | Tulsa | — | ◇ UNVERIFIED |
| SFSequoyah Fuels Corporation | Gore | — | ◇ UNVERIFIED |
| TAT and L Foundry INC / T and L Foundry | Glenpool | — | ◇ UNVERIFIED |
 Webco Industries, INC. Keystone | Sand Springs | — | ◇ UNVERIFIED |
| AIAlpha Investment Castings | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| BMBri-Steel Manufacturing LLC | Enid | 20–99 | ◐ LIKELY ACTIVE |
| MMct | Sallisaw | 20–99 | ◐ LIKELY ACTIVE |
| MUMPG US Stillwater | Stillwater | 100–499 | ◐ LIKELY ACTIVE |
| OSOKC - Southwest Tube | Sand Springs | 100–499 | ◐ LIKELY ACTIVE |
| OSOKC - Star Center Tube | Sand Springs | 100–499 | ◐ LIKELY ACTIVE |
| PMPRL Manufacturing | Tulsa | 20–99 | ◐ LIKELY ACTIVE |
| PFPT Foundry | Eind | 20–99 | ◐ LIKELY ACTIVE |
| PPt-oic | Blackwell | 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 |
| WIWebco Industries | Mannford | 100–499 | ◐ LIKELY ACTIVE |
| WIWebco Industries Corporate | Sand Springs | 100–499 | ◐ LIKELY ACTIVE |
| DRDuncan Recycling and Refining LLC | Duncan | — | ◇ UNVERIFIED |
| 3T3m Technical Ceramics / Quapaw Plant | Quapaw | — | ◇ UNVERIFIED |
| AGAaa Galvanizing Chelsea, INC Dba Iazz Chelsea Galvanizing | Chelsea | — | ◇ UNVERIFIED |
| AUArmor Up, LLC | Tulsa | — | ◇ UNVERIFIED |
| BABroken Arrow Aluminum | Broken Arrow | — | ◇ UNVERIFIED |
| CICastings Investment and Alloy Foundries | Bixby | — | ◇ UNVERIFIED |
| FOFormer Okie Chem | Tulsa | — | ◇ UNVERIFIED |
| FEFruitstand Enterprises INC. Dba Greenway Recycling Services | Tulsa | — | ◇ UNVERIFIED |
| GGerdau | Oklahoma City | — | ◇ UNVERIFIED |
| GAGerdau Ameristeel Us, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| GSGerdau-sand Springs Rail Product | Sand Springs | — | ◇ UNVERIFIED |
| JCJackson Clip CO. | Mazie | — | ◇ UNVERIFIED |
| MCMillison Casting Technology, LLC | Sallisaw | — | ◇ UNVERIFIED |
| OIOk Iron and Metal / Metal Reclamation Faclty | Ardmore | — | ◇ UNVERIFIED |
| OFONG Flowline Products, LLC | Sulphur | — | ◇ UNVERIFIED |
