| 1 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | Jul 2025 |
| 2 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2024 |
| 3 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 4 | Shearer James I | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 5 | Shelly Oil & Gas Inc | Avonmore, PA 15618-9748 | Gas Operator | Dec 2024 |
| 6 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2024 |
| 7 | Snyder Bros Inc | Kittanning, PA 16201 | Oil & Gas Operator | Jul 2025 |
| 8 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 9 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 10 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | Jun 2025 |
| 11 | Stonehaven Energy MGT Co LLC | Clearfield, PA 16830-7342 | Oil & Gas Operator | Dec 2019 |
| 12 | Susquehanna Energies Inc | Punxsutawney, PA 15767-4004 | Oil & Gas Operator | Dec 2024 |