| EWErnest Wieman Iron Works | Tulsa | — | ◇ UNVERIFIED |
| ESExpanded Solutions, LLC | Oklahoma City | — | ◇ UNVERIFIED |
| EMExpress Metal Fabricators, LLC | Locust Grove | — | ◇ UNVERIFIED |
| EPExpress Personnel Services | Fort Gibson | — | ◇ UNVERIFIED |
| ECEz Carrier, LLC | Mounds | — | ◇ UNVERIFIED |
| FSFabrication Solutions, LLC | Tulsa | — | ◇ UNVERIFIED |
| FIFabrico INC. | Tulsa | — | ◇ UNVERIFIED |
| FSFabsco Shell & Tube, LLC | Sapulpa | — | ◇ UNVERIFIED |
| FMFabtek Manufacturing, INC. | Tulsa | — | ◇ UNVERIFIED |
| FMFederal Metals, INC | Tulsa | — | ◇ UNVERIFIED |
| FSFence Solutions INC. | Enid | — | ◇ UNVERIFIED |
| FFFenceTrac Fence Systems, Inc. | Jenks | — | ◇ UNVERIFIED |
| FAFincher and Sons Pipe and Steel | Caddo | — | ◇ UNVERIFIED |
| FTFinishing Technologies INC. | Tulsa | — | ◇ UNVERIFIED |
| FIFin-x, INC | Owasso | — | ◇ UNVERIFIED |
| FPFirst Process Steel, INC. | Tulsa | — | ◇ UNVERIFIED |
| FTFlatlands Threading Co. Inc. | Oklahoma City | — | ◇ UNVERIFIED |
| FTFlatlands Threading Company, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| FWFlying W, INC. | Watonga | — | ◇ UNVERIFIED |
| FSFord Sandblasting | Eufaula | — | ◇ UNVERIFIED |
| FEForum Energy Technologies | Guthrie | — | ◇ UNVERIFIED |
| FMFoster Machine | Tulsa | — | ◇ UNVERIFIED |
| FMFrazier Manufacturing, INC. | Sand Springs | — | ◇ UNVERIFIED |
| FSFriction Solutions, LLC | Tulsa | — | ◇ UNVERIFIED |
| FIFTDM Investments, LLC | Locust Grove | — | ◇ UNVERIFIED |
| GLGarrett, LLC | Amber | — | ◇ UNVERIFIED |
| GHGea Heat Exchangers, Inc., Plant Three | Catoosa | — | ◇ UNVERIFIED |
| GRGea Rainey Heat Exchangers, INC. | Catoosa | — | ◇ UNVERIFIED |
| GMGenesis Metal CORP | Beggs | — | ◇ UNVERIFIED |
| GWGerald's Welding & Fabrication, INC. | Chickasha | — | ◇ UNVERIFIED |
| GHG Highfill | Tecumseh | — | ◇ UNVERIFIED |
| GOGiant Oil Tools, USA LLC | Oklahoma City | — | ◇ UNVERIFIED |
| GSGideon Steel Panel Company, LLC | Oklahoma City | — | ◇ UNVERIFIED |
| GMGivens Manufacturing, INC. | Tulsa | — | ◇ UNVERIFIED |
| GTGlenn Tool, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| GWGlobal Wire Cloth, LLC | Tulsa | — | ◇ UNVERIFIED |
| GMGrand Machine, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| GPGreat Plains Rebar, LLC | Oklahoma City | — | ◇ UNVERIFIED |
| HSHarmony Star Fabrication LLC | Tulsa | — | ◇ UNVERIFIED |
| HIHarsco Industrial Hammco, LLC | Owasso | — | ◇ UNVERIFIED |
| HIHarwell Industries | Oklahoma City | — | ◇ UNVERIFIED |
| HBH & B Machine & Manufacturing, INC. | Chickasha | — | ◇ UNVERIFIED |
| HTHeat Transfer Equipment CO. | Tulsa | — | ◇ UNVERIFIED |
| HMHELI-ARC Manufacturing Corp. | Owasso | — | ◇ UNVERIFIED |
| HMHenson Manufacturing & Sales | Adair | — | ◇ UNVERIFIED |
| HSHigh Summit Capital II LLC | Tulsa | — | ◇ UNVERIFIED |
| HMHignite Metal Fabricating | Rush Springs | — | ◇ UNVERIFIED |
| HMHill Manufacturing, INC. | Broken Arrow | — | ◇ UNVERIFIED |
| H3Hirsch 3667 Coporation | Clinton | — | ◇ UNVERIFIED |
| HIHitech, INC. | Moore | — | ◇ UNVERIFIED |
