| CHC H D LLC | Oklahoma City | — | ◇ UNVERIFIED |
| CACherokee Architectural Metals | Broken Arrow | — | ◇ UNVERIFIED |
 Cherokee Nation Red Wing, LLC | Tulsa | — | ◇ UNVERIFIED |
| CEChickasaw Energy Solutions | Marietta | — | ◇ UNVERIFIED |
| CMChickasha Manufacturing | Chickasha | — | ◇ UNVERIFIED |
| CMChickasha Manufacturing Company, INC. | Chickasha | — | ◇ UNVERIFIED |
| CTChisholm Trail Metal Works, LLC | Ninnekah | — | ◇ UNVERIFIED |
| CDChoctaw Defense Mcalester | Mcalester | — | ◇ UNVERIFIED |
| CSChoctaw Soldiers Industries, INC. | Tulsa | — | ◇ UNVERIFIED |
| CMCimarron Machine Works | Tulsa | — | ◇ UNVERIFIED |
| CCititrends | Roland | — | ◇ UNVERIFIED |
| CMCline Machine, INC. | Tulsa | — | ◇ UNVERIFIED |
| CPCmc Post Oklahoma LLC CO Commercial Met / Cmc Southern Post Durant | Durant | — | ◇ UNVERIFIED |
| CRCmc Rebar - Muskogee | Muskogee | — | ◇ UNVERIFIED |
| CSCmc Southern Post - Durant | Durant | — | ◇ UNVERIFIED |
| CSCmc Southern Post Durant | Durant | — | ◇ UNVERIFIED |
| CMC & M Precision, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| CSComponent Services Limited Partnership | Oklahoma City | — | ◇ UNVERIFIED |
| CIContinental Industries | Tulsa | — | ◇ UNVERIFIED |
| CPCooling Products INC. | Broken Arrow | — | ◇ UNVERIFIED |
| CMCopeland Manufacturing Corporation | Tulsa | — | ◇ UNVERIFIED |
| CICpco, INC. | Claremore | — | ◇ UNVERIFIED |
| CIC.s.c INC | Tuttle | — | ◇ UNVERIFIED |
| CICust-o-bend, INC. | Tulsa | — | ◇ UNVERIFIED |
| CCCustom Coatings of Broken Arrow, INC. | Broken Arrow | — | ◇ UNVERIFIED |
| CCCustom Copper Designs | Edmond | — | ◇ UNVERIFIED |
| CMCustom Manufacturing INC. | Oklahoma City | — | ◇ UNVERIFIED |
| DAD and D Design and Manufacturing, INC | Oklahoma City | — | ◇ UNVERIFIED |
| DDD & D Design Manufacturing INC. | Oklahoma City | — | ◇ UNVERIFIED |
| DBDeere Built, LLC | Ardmore | — | ◇ UNVERIFIED |
| DLDeerebuilt, LLC | Ardmore | — | ◇ UNVERIFIED |
| DYDelbert Young Sheet Metal Service | Ardmore | — | ◇ UNVERIFIED |
| DMDilbeck Manufacturing, INC. | Tulsa | — | ◇ UNVERIFIED |
| DSDoing Steel, INC. | Stillwater | — | ◇ UNVERIFIED |
| DBDon Bateman Sheet Metal Fabrication | Sapulpa | — | ◇ UNVERIFIED |
| DYDon Young Company, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| DFDuct Fabrication Company, INC. | Oklahoma City | — | ◇ UNVERIFIED |
| DHDunham Heat Flow Products | Tulsa | — | ◇ UNVERIFIED |
| DMDunlap Manufacturing | Tulsa | — | ◇ UNVERIFIED |
| ECEads Cooling Solutions, LLC | Catoosa | — | ◇ UNVERIFIED |
| ESEagle Suspensions | Durant | — | ◇ UNVERIFIED |
| E2Eco 2007 | Broken Arrow | — | ◇ UNVERIFIED |
| EVEichler Valve | Edmond | — | ◇ UNVERIFIED |
| ECElk City Sheet Metal, INC. | Elk City | — | ◇ UNVERIFIED |
| EPElkhart Products Corporation | Westville | — | ◇ UNVERIFIED |
| EIEmco Industries, LLC | Claremore | — | ◇ UNVERIFIED |
| EGEmmaus Group, LLC | Tulsa | — | ◇ UNVERIFIED |
| EIEnerfin, Incorporated | Broken Arrow | — | ◇ UNVERIFIED |
| EDEngland Dock Construction | Afton | — | ◇ UNVERIFIED |
| EMEnterprise Manufacturing, LLC | Tulsa | — | ◇ UNVERIFIED |
