| 1 | Saur, Jerry | Luling, TX 78648 | Oil & Gas Operator | Dec 2015 |
| 2 | Schievelbein, Bryan O. | Seguin, TX 78155 | Oil & Gas Operator | Feb 2026 |
| 3 | Scully And Smith Oil Corporation | Salado, TX 76571 | Oil & Gas Operator | Feb 1995 |
| 4 | Scully Exploration LLC | Salado, TX 76571 | Gas Operator | May 2020 |
| 5 | Seaco Production | Dripping SPGS, TX 78620 | Oil & Gas Operator | Feb 2016 |
| 6 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 7 | Seay Oil & Gas, LTD. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Apr 2013 |
| 8 | Seguin Pump | Seguin, TX 78155 | Oil & Gas Operator | Sep 2017 |
| 9 | Sellers Lease Service, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Feb 2026 |
| 10 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 11 | Shefts & Shefts, Inc. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 12 | Short Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Nov 2025 |
| 13 | SHWJ Oil & Gas Co., Inc. | Oil City, LA 71061 | Oil Operator | Feb 2026 |
| 14 | Signal Oil And Gas Company | Colleyville, TX 76034 | Oil & Gas Operator | Feb 2026 |
| 15 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Feb 2026 |
| 16 | Solutions Projects And Consulting, LLC | Houston, TX 77070 | Oil Operator | Feb 2026 |
| 17 | Source Petroleum Inc. | San Antonio, TX 78265 | Oil & Gas Operator | Feb 2026 |
| 18 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 19 | Spencer-Cloughly Investments Inc | San Marcos, TX 78666 | Oil & Gas Operator | Aug 2002 |
| 20 | Spiller, H. G. | San Antonio, TX 78213 | Oil & Gas Operator | Oct 1993 |
| 21 | Spiller, J.A. | Austin, TX 78735 | Oil & Gas Operator | Jan 2016 |
| 22 | Spiller, Joseph A. | Austin, TX 78746 | Oil & Gas Operator | Oct 1993 |
| 23 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |