| 1 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 2 | San Dia Producing Company | Deanville, TX 77852 | Oil & Gas Operator | Mar 2025 |
| 3 | Scott Petroleum, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 1995 |
| 4 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 5 | Seay Oil & Gas, LTD. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Apr 2013 |
| 6 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Mar 2025 |
| 7 | Shale Operating Co. | Dallas, TX 75356 | Oil & Gas Operator | Mar 2025 |
| 8 | Shefts & Shefts, Inc. | Luling, TX 78648 | Oil & Gas Operator | Mar 2025 |
| 9 | Sheldon Resources, L.P. | Bryan, TX 77805 | Oil & Gas Operator | Mar 2025 |
| 10 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 11 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 12 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Mar 2025 |
| 13 | Sierra Minerals, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2025 |
| 14 | Skytop Oil & Gas | Giddings, TX 78942 | Oil & Gas Operator | Mar 2025 |
| 15 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Mar 2025 |
| 16 | Somont Oil Co., Inc. | Spring, TX 77379 | Oil & Gas Operator | Jan 2025 |
| 17 | Sonoble Operating, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jun 2003 |
| 18 | South Texas Drilling & Expl, Inc | San Antonio, TX 78217 | Oil & Gas Operator | Jan 1999 |
| 19 | Southridge Operating Company | San Marcos, TX 78667 | Oil & Gas Operator | Mar 2025 |
| 20 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 21 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 22 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Mar 2025 |
| 23 | Sto Operating Company | San Antonio, TX 78258 | Oil & Gas Operator | Mar 2025 |
| 24 | Stratco Operating Co., Inc. | Austin, TX 78701 | Oil & Gas Operator | Mar 2025 |