| 1 | Pa Land Holdings Company LLC | | Gas Operator | Dec 2017 |
| 2 | Pa Land Holdings Corp | | Oil & Gas Operator | Dec 2011 |
| 3 | Pa Mineral SVCS LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2025 |
| 4 | Patriot Exploration Corp | Stahlstown, PA 15687-1301 | Oil & Gas Operator | Dec 2025 |
| 5 | PDC Mountaineer LLC | Wexford, PA 15090-3400 | Oil & Gas Operator | Dec 2017 |
| 6 | Penneco Oil Company, Inc. | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2025 |
| 7 | Pennzoil Prod Co | | Oil & Gas Operator | Dec 2000 |
| 8 | Peoples Natural Gas Co LLC | Pittsburgh, PA 15212 | Gas Operator | Dec 2016 |
| 9 | Petro Dev Corp | Bridgeport, WV 26330-0026 | Oil & Gas Operator | Dec 2013 |
| 10 | Petro SVC Partners Inc | Indiana, PA 15701-8556 | Oil & Gas Operator | Dec 2025 |
| 11 | Phillips Exploration Inc | Warrendale, PA 15086 | Oil & Gas Operator | Dec 2012 |
| 12 | Phoenix Energy Prod Inc | Freeport, PA 16229-1126 | Oil & Gas Operator | Dec 2025 |
| 13 | Pillar Energy Pa LLC | Charleston, WV 25312-5987 | Oil & Gas Operator | Dec 2025 |
| 14 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | Jun 2026 |
| 15 | Power Gas MKT & Trans Inc | Akron, OH 44311-1062 | Oil & Gas Operator | Dec 2008 |