| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S & M Drilling, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2023 |
| 3 | S & S Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 1998 |
| 4 | S. M. A. Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1997 |
| 5 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | S.U.E. Company | Abilene, TX 79604 | Oil Operator | Jan 1998 |
| 7 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 8 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 9 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 10 | San Patricio Corporation | Dinero, TX 78350 | Oil & Gas Operator | Sep 2003 |
| 11 | Sanders Energy LLC | Aledo, TX 76008 | Oil & Gas Operator | Oct 2025 |
| 12 | Santa Fe Exploration Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 1997 |
| 13 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 14 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 15 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 16 | Schetawee, Inc. | Hamlin, TX 79520 | Oil & Gas Operator | Mar 2008 |
| 17 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 18 | Schkade, Louis | Albany, TX 76430 | Oil & Gas Operator | Mar 2008 |
| 19 | Scott Operating, Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 20 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 21 | Sequoia Fossil Fuels, Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 22 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 23 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 24 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 25 | Smalley, Bill | Albany, TX 76430 | Oil & Gas Operator | Jul 2001 |
| 26 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 27 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 28 | Snyder Drilling Corp. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 29 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 30 | Southern Exploration, Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Aug 2023 |
| 31 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Oct 2025 |
| 32 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 33 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 34 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 35 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 36 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 37 | Staley, Jack C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 38 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 39 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 40 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 41 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 42 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 43 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 44 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 45 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 46 | Stowe Energy, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Mar 2003 |
| 47 | Stryker Energy Corp. | Mesquite, TX 75180 | Oil & Gas Operator | Oct 2025 |
| 48 | Subsea Operating Co. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 49 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Oct 2025 |
| 50 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 51 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Oct 2025 |
| 52 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 53 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 54 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Oct 2025 |