| AIAlpha Investment Casting CORP / Alpha Investment Casting CORP | Tulsa | OK | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group / American Alloy Ii | Muskogee | OK | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| AFAmerican Foundry Group LLC - Bixby | Bixby | OK | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| ARArk Ramos Foundry & Manufacturing CO INC | Oklahoma City | OK | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| GIGray Iron Fndry | Blackwell | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NONational Oilwell Varco/tulsa Multiplex | Tulsa | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| OIOklahoma Investment Casting CO | Blackwell | OK | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| PCPt Central Machine and Tool Company | Enid | OK | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SASlw Automotive INC / Sallisaw Plt | Sallisaw | OK | Primary Metal Manufacturing331523 | — | ◇ UNVERIFIED |
| SWSouthwestern Wire, INC. | Norman | OK | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TCThe Crucible LLC | Norman | OK | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| TFTonkawa Foundry INC / Tonkawa Foundry | Tonkawa | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| VNValmont Newmark | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Webco Industries, INC. Mannford Specialty Tube | Mannford | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| Webco Industries, INC. Swt Cooper Bldg | Sand Springs | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| 2S2300 S Hwy 97 | Sand Springs | OK | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| BFBig Four Foundries CORP | Tulsa | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| BCBorg Compressed Steel CORP | Tulsa | OK | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| EBElectron Blackwell | Blackwell | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| ECEmpire Casting - Tulsa Gray Iron Fndry | Tulsa | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| FGFascast Gray Iron Foundary | Tulsa | OK | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| FIFmri, INC. | Muskogee | OK | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| FAFrailey Alloys / Frailey Alloys | Chouteau | OK | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| GAGerdau Ameristeel - Sand Springs Facility | Sand Springs | OK | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| NANov Ameron Tulsa Pole Products Tube Manufacturing | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NANov Ameron Tulsa Pole Products Welding & Fabrication | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PIParagon Industries, INC | Sapulpa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PIParagon Industries INC / Paragon Industries INC | Sapulpa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PBProgressive Brass Mfg CO / Progressive Brass Mfg CO | Tulsa | OK | Primary Metal Manufacturing331525 | — | ◇ UNVERIFIED |
| SFSequoyah Fuels Corporation | Gore | OK | Chemical Manufacturing325188 | — | ◇ UNVERIFIED |
| TAT and L Foundry INC / T and L Foundry | Glenpool | OK | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| Webco Industries, INC. Keystone | Sand Springs | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| DRDuncan Recycling and Refining LLC | Duncan | OK | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| 3T3m Technical Ceramics / Quapaw Plant | Quapaw | OK | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| AGAaa Galvanizing Chelsea, INC Dba Iazz Chelsea Galvanizing | Chelsea | OK | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| AUArmor Up, LLC | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| BABroken Arrow Aluminum | Broken Arrow | OK | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| CICastings Investment and Alloy Foundries | Bixby | OK | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| FOFormer Okie Chem | Tulsa | OK | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| FEFruitstand Enterprises INC. Dba Greenway Recycling Services | Tulsa | OK | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| GSGerdau-sand Springs Rail Product | Sand Springs | OK | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| JCJackson Clip CO. | Mazie | OK | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| OIOk Iron and Metal / Metal Reclamation Faclty | Ardmore | OK | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| OFONG Flowline Products, LLC | Sulphur | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OSOps Sales Company | Dewey | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TUTubacex US Holding INC / Tubacex US Holding INC | Durant | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| USUnited Slings & Lifting, INC. | Tecumseh | OK | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| WIWord Industries Fabrication, LLC | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| YOYoung Oil Tools LLC | Cushing | OK | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
