| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Camio Oil Co. | Oil Operator | Dec 2004 | |
| 2 | Carmel Energy, Inc. | Oil Operator | Dec 2009 | |
| 3 | Carter-Waters Corp. | Oil Operator | Dec 1988 | |
| 4 | Chemical Bioteck Solutions LLC | Oil Operator | Sep 2021 | |
| 5 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 6 | Coastal Oil & Gas | Oil & Gas Operator | Jul 1995 | |
| 7 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jun 2025 |
| 8 | Continental Exploration, Inc. | Oil Operator | Dec 2001 |