| 1 | C W Riggs Inc | | Oil & Gas Operator | Dec 1999 |
| 2 | C. I. McKown & Son, Inc. | Newton, WV 252660711 | Oil & Gas Operator | Dec 2021 |
| 3 | Cad Energy Corporation | | Oil & Gas Operator | Dec 2021 |
| 4 | Cain, Francis E. | Big Bend, WV 261360080 | Oil & Gas Operator | Dec 2021 |
| 5 | Cane Creek Energy, LLC | Charleston, WV 25314 | Oil & Gas Operator | Dec 2021 |
| 6 | Capital Energy, LLC | Ripley, WV 25271 | Oil & Gas Operator | Dec 2021 |
| 7 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 8 | Central Pacific Group, Inc. | | Oil & Gas Operator | Dec 2003 |
| 9 | Chastain Farms LLC | Guthrie, KY 42234 | Oil & Gas Operator | Mar 2020 |
| 10 | Chesapeake Appalachia, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 11 | Clear Creek Energy LLC | Seneca Rocks, WV 26884 | Oil & Gas Operator | Dec 2021 |
| 12 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 13 | Columbia Natural Resources, LLC | Charleston, WV 23502 | Oil & Gas Operator | Dec 2021 |
| 14 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 15 | Core Appalachia Operating LLC | Charleston, WV 25362 | Oil & Gas Operator | Dec 2024 |
| 16 | Creston Oil Corporation | Jacksonville, FL 322253869 | Oil & Gas Operator | Dec 2021 |
| 17 | Cunningham Energy LLC | Charleston, WV 25302 | Oil & Gas Operator | Dec 2021 |