| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S&G Oil LLC | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2025 |
| 3 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 4 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 5 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | Mar 2025 |
| 6 | Salmon, Raymond Jr Estate | Nocona, TX 76255 | Oil Operator | Mar 2025 |
| 7 | Salmon, Raymond, Jr. | Nocona, TX 76255 | Oil & Gas Operator | Sep 2017 |
| 8 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Mar 2025 |
| 9 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 10 | Schkade Bros. Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 2021 |
| 11 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 12 | Seel-Mac Oil & Gas LLC | Richardson, TX 75080 | Oil Operator | Jul 2011 |
| 13 | Seelye, William L. | Plano, TX 75024 | Oil & Gas Operator | Oct 2005 |
| 14 | Seitz, J. R. & Adam | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2008 |
| 15 | Self Brothers | Montague, TX 76251 | Oil & Gas Operator | Mar 2025 |
| 16 | Sequoia Oil & Gas, Inc. | Fort Worth, TX 76164 | Oil & Gas Operator | Jan 1993 |
| 17 | Service Clearing Corp. | Dallas, TX 75229 | Oil & Gas Operator | Mar 2025 |
| 18 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 19 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Mar 2025 |
| 20 | Silver Creek Resources, LLC | Irving, TX 75038 | Oil & Gas Operator | Apr 2017 |
| 21 | Skidmore Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Jul 1997 |
| 22 | Skidmore, James E. | Nocona, TX 76255 | Oil & Gas Operator | Nov 2008 |
| 23 | Skinner Cattle, Inc. | Nocona, TX 76255 | Oil Operator | Mar 2025 |
| 24 | Smith & Spragins | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 1995 |
| 25 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 26 | Snow Oil Company | Nocona, TX 76255 | Oil Operator | Mar 2025 |
| 27 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2025 |
| 28 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 29 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 30 | Spragins, Ed | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 31 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 32 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2025 |
| 33 | Sta-Kel Incorporated | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 34 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | Mar 2025 |
| 35 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 36 | Stelucan Energy, LLC | Wichita Falls, TX 76310 | Oil & Gas Operator | Mar 2025 |
| 37 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 38 | Stone, J. G. Oil Co. | Victoria, TX 77904 | Oil & Gas Operator | Sep 2018 |
| 39 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 40 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 41 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 42 | Suncoast Technical Services Inc | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 43 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 44 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 45 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |
| 46 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |