| 1 | C. I. McKown & Son, Inc. | Newton, WV 25266-0711 | Oil & Gas Operator | Dec 2021 |
| 2 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 3 | Carnegie Production Co | Charleston, WV 25328 | Oil & Gas Operator | Dec 2017 |
| 4 | Charity Gas, Inc. | Salem, WV 26426-5554 | Oil & Gas Operator | Dec 2021 |
| 5 | Chase Petroleum, Inc. | Glenville, WV 26351-1026 | Oil & Gas Operator | Dec 2021 |
| 6 | Chesapeake Appalachia, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 7 | Clark, N.G. Dba Glenn, Inc | | Oil & Gas Operator | Dec 2021 |
| 8 | Clem Energy LLC | | Oil & Gas Operator | Dec 2021 |
| 9 | Clowser Well Service, Inc. | | Oil & Gas Operator | Dec 2021 |
| 10 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 11 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Feb 2026 |
| 12 | Cobham Gas Industries, Inc. | | Oil & Gas Operator | Dec 2006 |
| 13 | Columbia Natural Resources, LLC | Charleston, WV 23502 | Oil & Gas Operator | Dec 2021 |
| 14 | Commonwealth Energy, Inc. | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2021 |
| 15 | Consol Gas Company | Canonsburg, PA 15317 | Oil & Gas Operator | Dec 2021 |
| 16 | Continental Petroleum, LLC | | Oil & Gas Operator | Oct 2013 |
| 17 | Core Solutions LLC | | Oil & Gas Operator | Dec 2021 |
| 18 | Creston Oil Corporation | Jacksonville, FL 32225-3869 | Oil & Gas Operator | Dec 2021 |