| 1 | S & H Oil Company | Vernon, TX 76384 | Oil & Gas Operator | Sep 1999 |
| 2 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 3 | S & S Well Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Aug 1998 |
| 4 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 5 | S.U.E. Company | Abilene, TX 79604 | Oil Operator | Jan 1998 |
| 6 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 7 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 8 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 9 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 10 | Santa Fe Energy Oper. Part., LP | Houston, TX 77057 | Oil & Gas Operator | Dec 1994 |
| 11 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 12 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 13 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 14 | Schalk, Thomas S. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 1995 |
| 15 | Schiff, H. G. & Co. | Dallas, TX 75206 | Oil & Gas Operator | Jul 1993 |
| 16 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 17 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 18 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 19 | Sheneeda Energy, LLC | O Brien, TX 79539 | Oil Operator | Jun 2025 |
| 20 | Shiloh Oil Company LLC | Williston, FL 32696 | Oil & Gas Operator | Oct 2025 |
| 21 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 22 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 23 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 24 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Oct 2025 |
| 25 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 26 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 27 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 28 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 29 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 30 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 31 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Oct 2025 |
| 32 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 33 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 34 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 35 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 36 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 37 | Stowe Energy, Inc. | Vernon, TX 76384 | Oil & Gas Operator | Mar 2003 |
| 38 | Strange, D. D. | Archer City, TX 76351 | Oil & Gas Operator | Sep 2014 |
| 39 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Oct 2025 |
| 40 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 41 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |