| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | C. H. Cuatro | Gas Operator | Sep 1996 | |
| 2 | Calpetco III-Teel 77 A | Gas Operator | May 1980 | |
| 3 | Calpetco-Herbst Expl. Inc. | Gas Operator | Jan 1990 | |
| 4 | Capital Gas, Inc. | Gas Operator | Jan 1998 | |
| 5 | Cargas Operating Company | Oil & Gas Operator | Dec 2024 | |
| 6 | Ceka Gas, Div Of GTC | Oil & Gas Operator | May 1988 | |
| 7 | Ciera Resources, Inc. | Gas Operator | Nov 1998 | |
| 8 | Clements-B & MCK - Luffey | Gas Operator | Apr 1979 | |
| 9 | Coho Louisiana Production Co | Gas Operator | Dec 1998 | |
| 10 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |