| 1 | S.O.C. Investors, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2024 |
| 2 | Sabco Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2011 |
| 3 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 4 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 5 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 6 | Sawtooth Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 7 | Sawtooth, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2013 |
| 8 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Dec 2024 |
| 9 | Scoggins Oil & Gas Co. | Seabrook, TX 77586 | Oil & Gas Operator | Jun 2000 |
| 10 | Seismic Investment Group, Inc. | Houston, TX 77055 | Oil & Gas Operator | Jun 2008 |
| 11 | Senora Resources, Inc. | Dime Box, TX 77853 | Oil & Gas Operator | Dec 2024 |
| 12 | Shell Trading Us Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2024 |
| 13 | Shoreham Oil & Gas Company, Inc. | Katy, TX 77492 | Oil & Gas Operator | Dec 2024 |
| 14 | Silverbrook Operating II LLC | Barker, TX 77413 | Oil Operator | Dec 2024 |
| 15 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil & Gas Operator | Dec 2024 |
| 16 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 17 | Smyth Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2003 |
| 18 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 19 | Southeastern Pipe Line Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2020 |
| 20 | Southern Resource Company | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Mar 2022 |
| 21 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Dec 2024 |
| 22 | Stealth Onsite Solutions LLC | Pasadena, TX 77505 | Oil Operator | Dec 2024 |
| 23 | Stoneham Oil Company | Houston, TX 77002 | Oil & Gas Operator | Sep 1995 |
| 24 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2024 |
| 25 | Sue-Ann Production Company | Victoria, TX 77903 | Oil & Gas Operator | Mar 2008 |
| 26 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |