| 1 | C & D Gas Co | Apollo, PA 15613-9714 | Oil & Gas Operator | Dec 2024 |
| 2 | Capital Oil & Gas Inc | Austintown, OH 44515-3033 | Oil & Gas Operator | Dec 2024 |
| 3 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2024 |
| 4 | Carnegie Production Co | Charleston, WV 25328 | Oil & Gas Operator | Dec 2017 |
| 5 | Casella Charles J | Avonmore, PA 15618-1028 | Oil & Gas Operator | Dec 2015 |
| 6 | Castle Gas Company Inc | Pittsburgh, PA 15236-2466 | Oil & Gas Operator | Dec 2007 |
| 7 | Caw Prop LP | Dayton, PA 16222-1624 | Gas Operator | Dec 2024 |
| 8 | Chestnut Ridge Energy Of Pa LLC | Mineral Point, PA 15942-4411 | Gas Operator | Dec 2024 |
| 9 | Chiplis Charles T SR | Indiana, PA 15701-2162 | Gas Operator | Dec 2024 |
| 10 | Christine Marie Exploration LP | Indiana, PA 15701-0515 | Oil & Gas Operator | Dec 2024 |
| 11 | CNG Development Co | | Oil & Gas Operator | Dec 2008 |
| 12 | CNX Gas Company LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Sep 2025 |
| 13 | Columbia Natural Res Inc | Charleston, WV 25362-0070 | Gas Operator | Dec 2008 |
| 14 | Consol Gas Company | Canonsburg, PA 15317 | Oil & Gas Operator | Dec 2021 |
| 15 | Cook Energy Inc | Cooksburg, PA 16217-0054 | Oil & Gas Operator | Dec 2004 |
| 16 | Coolspring Gas & Oil Co LLC | Coolspring, PA 15730-8524 | Gas Operator | Dec 2024 |
| 17 | Coterra Energy Inc | Pittsburgh, PA 15275-1121 | Oil & Gas Operator | Sep 2025 |