| 1 | C & C Tank Service, Inc. | Sterling, KS 67579 | Oil Operator | Oct 2020 |
| 2 | C & K Operating LLC | Kingman, KS 67068 | Oil & Gas Operator | Dec 2023 |
| 3 | C K Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2023 |
| 4 | C M X Incorporat | | Oil & Gas Operator | Dec 1996 |
| 5 | Cam Development | | Oil & Gas Operator | Dec 1990 |
| 6 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 7 | Capital Energy Group, Inc. | Bardonia, NY 10954 | Oil Operator | Jan 1998 |
| 8 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2023 |
| 9 | Carrie Exploration & Development, LLC | Hays, KS 67601 | Oil & Gas Operator | Jun 2023 |
| 10 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Dec 2023 |
| 11 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Feb 2024 |
| 12 | Champion Petrole | | Oil Operator | Jan 1992 |
| 13 | Charter Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2023 |
| 14 | Chase Well Service, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2004 |
| 15 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 16 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 17 | Christa Oil Comp | | Oil Operator | Nov 1994 |
| 18 | Clinton Production, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2023 |
| 19 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2023 |
| 20 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 21 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 22 | Commercial Oil - | | Oil Operator | Apr 1994 |
| 23 | Commonwealth Pet | | Oil & Gas Operator | Nov 1995 |
| 24 | Connell, Mark Allen | Claflin, KS 67525 | Oil Operator | Dec 2023 |
| 25 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 26 | Conoco Incorpora | | Oil & Gas Operator | Apr 1988 |
| 27 | Consolidated Oil | | Oil Operator | Jul 1996 |
| 28 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 29 | Continental Brok | | Oil Operator | Oct 1994 |
| 30 | Coronado Oil & G | | Oil Operator | Dec 1996 |
| 31 | Coronado Oil & Gas, Inc. | Great Bend, KS 67530 | Oil Operator | Jul 2004 |
| 32 | Crude Producers | | Oil & Gas Operator | Sep 1988 |
| 33 | Culver & Grounds | | Oil & Gas Operator | Nov 1995 |
| 34 | Curt'S Oil Operation, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2023 |