| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & V Operating | Zephyr, TX 76890 | Oil & Gas Operator | May 2024 |
| 3 | Sandstone Services, LLC | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 4 | Santa Anna Operating 3, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | May 2024 |
| 5 | Santa Anna Operating Co I, LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2018 |
| 6 | Scranton Exploration | Eastland, TX 76448 | Oil & Gas Operator | May 2024 |
| 7 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | May 2024 |
| 8 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | May 2024 |
| 9 | Shady Oil Co. | Brownwood, TX 76801 | Oil & Gas Operator | May 2024 |
| 10 | Sharpe Energy Company | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |
| 11 | Sherman, L. B. | Early, TX 76803 | Oil & Gas Operator | Jun 1998 |
| 12 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | May 2024 |
| 13 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 14 | Shumate, Jess | Brookesmith, TX 76827 | Oil Operator | Jun 2006 |
| 15 | Sikes, Arlas M. | Brownwood, TX 76801 | Oil & Gas Operator | May 2000 |
| 16 | Simpson Operating Services, LP | Ballinger, TX 76821 | Oil & Gas Operator | May 2024 |
| 17 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Mar 2024 |
| 18 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | May 2024 |
| 19 | So Operating Company | Cisco, TX 76437 | Oil & Gas Operator | May 2024 |
| 20 | Southeastern Resources Corp. | Mansfield, TX 76063 | Oil & Gas Operator | Feb 2004 |
| 21 | Southstone Energy, LLC | Austin, TX 78735 | Oil Operator | May 2024 |
| 22 | Southwest Gas Systems, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2024 |
| 23 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 24 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 25 | Stacha, Eddy A. | Rice, TX 75155 | Oil & Gas Operator | May 2024 |
| 26 | Staub, Larry | Richardson, TX 75080 | Oil & Gas Operator | Aug 2003 |
| 27 | Stealth, Inc. | Cross Plains, TX 76443 | Gas Operator | Mar 1997 |
| 28 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 29 | Stryker Energy Corp. | Mesquite, TX 75180 | Oil & Gas Operator | May 2024 |
| 30 | Stubblefield Energy Company | Abilene, TX 79604 | Oil & Gas Operator | May 2024 |
| 31 | Sub Surface Operations | Brownwood, TX 76804 | Oil & Gas Operator | May 2024 |
| 32 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | May 2024 |
| 33 | Subsurface Exploration | Coleman, TX 76834 | Oil & Gas Operator | Apr 2006 |
| 34 | Subsurface Production, Inc. | Coleman, TX 76834 | Oil & Gas Operator | May 2024 |
| 35 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 36 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 37 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | May 2024 |
| 38 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | May 2024 |
| 39 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2024 |