| 1 | C G G Oil Co | | Oil & Gas Operator | Dec 2006 |
| 2 | C. I. McKown & Son, Inc. | Newton, WV 25266-0711 | Oil & Gas Operator | Dec 2021 |
| 3 | Cad Energy Corporation | Creston, WV 26141 | Oil & Gas Operator | Dec 2021 |
| 4 | Cain, Francis E. | Big Bend, WV 26136-0080 | Oil & Gas Operator | Dec 2021 |
| 5 | Carnegie Production Co | Charleston, WV 25328 | Oil & Gas Operator | Dec 2017 |
| 6 | Central Pacific Group, Inc. | | Oil & Gas Operator | Dec 2003 |
| 7 | CG&G Oil LLC | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2021 |
| 8 | Charity Gas, Inc. | Salem, WV 26426-5554 | Oil & Gas Operator | Dec 2021 |
| 9 | Chase Petroleum, Inc. | Glenville, WV 26351-1026 | Oil & Gas Operator | Dec 2021 |
| 10 | Chesapeake Appalachia LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 11 | Clem Energy LLC | | Oil & Gas Operator | Dec 2021 |
| 12 | Clowser Well Service, Inc. | | Oil & Gas Operator | Dec 2021 |
| 13 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 14 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jul 2025 |
| 15 | Cobham Gas Industries, Inc. | | Oil & Gas Operator | Dec 2006 |
| 16 | Coffman Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 17 | Colt Oil Corporation | Smithville, WV 26178 | Oil & Gas Operator | Dec 2021 |
| 18 | Columbia Natural Resources, LLC | Charleston, WV 23502 | Oil & Gas Operator | Dec 2021 |
| 19 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |
| 20 | Conquest Petroleum Inc | | Oil & Gas Operator | Nov 2014 |
| 21 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 22 | Creston Oil Corporation | Jacksonville, FL 32225 | Oil & Gas Operator | Dec 2021 |