| 1 | R B Robertson & Son Gas & Oil Co LP | New Bethlehem, PA 16242-0190 | Oil & Gas Operator | Dec 2024 |
| 2 | Range Opr Co | Yatesboro, PA 16263-0235 | Oil & Gas Operator | Dec 1999 |
| 3 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Jun 2025 |
| 4 | Red Oak Energy LLC | Clarksburg, PA 15725-8824 | Oil & Gas Operator | Dec 2024 |
| 5 | Redmill Drilling | Kittanning, PA 16201-7123 | Oil & Gas Operator | Jul 2025 |
| 6 | Richard G Boarts | Ford City, PA 16226-7001 | Gas Operator | Dec 2012 |
| 7 | Richards Drilling Co | Venango, PA 16440-1123 | Oil & Gas Operator | Dec 2015 |
| 8 | Ridgeview Gas & Oil Inc | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2024 |
| 9 | Ridgeview Gas Co | Templeton, PA 16259-4505 | Oil & Gas Operator | Dec 2010 |
| 10 | Roach & Assoc Inc | Pittsburgh, PA 15228-1924 | Gas Operator | Dec 2024 |
| 11 | RS Gas Co Inc | Sprankle Mills, PA 15776-8312 | Gas Operator | Dec 2024 |