| 1 | S2 Oil, LLC | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2024 |
| 2 | Sandco Oil & Gas, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2015 |
| 3 | Sandstone Services, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 4 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 5 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 6 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | Dec 2024 |
| 7 | Sequoia Energy Resources | Dallas, TX 75207 | Oil & Gas Operator | Dec 2024 |
| 8 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2024 |
| 9 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2024 |
| 10 | Sherman, L. B. | Early, TX 76803 | Oil & Gas Operator | Jun 1998 |
| 11 | Skybridge Energy LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |
| 12 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 13 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | Dec 2024 |
| 14 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2024 |
| 15 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 16 | Southern Tejas Asset Group LLC | McAllen, TX 78501 | Oil & Gas Operator | Dec 2024 |
| 17 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Dec 2024 |
| 18 | Square One Energy, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2015 |
| 19 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 20 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | Dec 2024 |
| 21 | Star One Energy, Inc. | Fort Worth, TX 76163 | Oil & Gas Operator | May 2012 |
| 22 | Stealth, Inc. | Cross Plains, TX 76443 | Gas Operator | Mar 1997 |
| 23 | Stephenson Oil & Gas, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Sep 1999 |
| 24 | Stray Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Aug 2008 |
| 25 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2024 |