| 1 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jul 2025 |
| 2 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 3 | Shelly Oil & Gas Inc | Avonmore, PA 15618-9748 | Gas Operator | Dec 2024 |
| 4 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2024 |
| 5 | Snyder Bros Inc | Kittanning, PA 16201 | Oil & Gas Operator | Jul 2025 |
| 6 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 7 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 8 | Songer Harriett R | Brookville, PA 15825-5367 | Oil & Gas Operator | Dec 2010 |
| 9 | Spartan Resource MGMT Corp | Rural Valley, PA 16249-0326 | Gas Operator | Dec 2024 |
| 10 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | Jun 2025 |
| 11 | Susquehanna Energies Inc | Punxsutawney, PA 15767-4004 | Oil & Gas Operator | Dec 2024 |
| 12 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |