| 1 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 2 | San Isidro Development Co, L. C. | Sandia, TX 78383 | Oil & Gas Operator | Oct 2025 |
| 3 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 4 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 5 | Sandalwood Oil & Gas, Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 6 | Saxet Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Mar 2004 |
| 7 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 8 | Seguro Well Service, Inc. | Gonzales, TX 78629 | Oil & Gas Operator | Oct 2025 |
| 9 | Seneca Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 10 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 11 | Shefts & Shefts, Inc. | Luling, TX 78648 | Oil & Gas Operator | Oct 2025 |
| 12 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | Oct 2025 |
| 13 | Shubuta Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Sep 1998 |
| 14 | Simray Oil & Gas, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Sep 2003 |
| 15 | Simray Operating Corp. | Richardson, TX 75080 | Oil & Gas Operator | Mar 2009 |
| 16 | Sisters Operating Company | Victoria, TX 77904 | Oil & Gas Operator | Nov 2010 |
| 17 | Slack Oil & Gas | Refugio, TX 78377 | Oil & Gas Operator | Dec 2012 |
| 18 | South Texas Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 19 | Southern Royalty Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 1997 |
| 20 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 21 | Spur Operating Co. | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 22 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 23 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 24 | Summit Resources MGMT., LLC. | Edmond, OK 73083 | Oil & Gas Operator | Oct 2025 |
| 25 | Suncoast Technical Services Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 26 | Sure Flow Oil & Gas Company | Victoria, TX 77902 | Oil & Gas Operator | Mar 2008 |
| 27 | Sure Flow Oil & Gas, Inc. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |