| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 3 | Sage Natural Resources LLC | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 4 | Sage Oil And Gas, LLC | Graham, TX 76450 | Gas Operator | Mar 2025 |
| 5 | Salt Of The Earth Energy, LLC | Montgomery, TX 77356 | Oil & Gas Operator | Mar 2025 |
| 6 | Samco Oil & Gas Co. | Granbury, TX 76048 | Gas Operator | Feb 2002 |
| 7 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 8 | Scope Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2009 |
| 9 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 10 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 11 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 12 | Senkel, Wesley, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2007 |
| 13 | Serendipity Exploration, Inc. | Weatherford, TX 76087 | Gas Operator | May 1997 |
| 14 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 15 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 16 | Sheets Exploration Co., Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2016 |
| 17 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Mar 2025 |
| 18 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 19 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 20 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Dec 2024 |
| 21 | Simpson Oil & Land Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 22 | Sitton, Ronnie Incorporated | Graford, TX 76449 | Oil & Gas Operator | Feb 2020 |
| 23 | Slate Holdings, Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 24 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 25 | Somerset Operating, LLC | Weatherford, TX 76086 | Gas Operator | Mar 2025 |
| 26 | Spartan Oil Corporation | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 27 | Special Energy Corporation | Stillwater, OK 74076 | Oil & Gas Operator | Mar 2025 |
| 28 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 29 | Spindletop Oil & Gas Co. | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 30 | St. Johns Operating #1 L.P. | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 31 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 32 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 33 | Star Of Texas Energy SRVS, Inc. | Austin, TX 78702 | Oil & Gas Operator | Mar 2025 |
| 34 | Star Operating, Inc | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2025 |
| 35 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 36 | Stephens, Hayseed Oil Inc. | Weatherford, TX 76087 | Oil & Gas Operator | Mar 2008 |
| 37 | Stephenson Oil & Gas, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Sep 1999 |
| 38 | Sterling Oil And Gas | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 39 | Stovall, Howard | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |
| 40 | Strata Operating, Inc. | Corpus Chrsti, TX 78466 | Oil & Gas Operator | Mar 2025 |
| 41 | Stratagas, Inc. | Rowlett, TX 75088 | Oil & Gas Operator | May 2006 |
| 42 | Stroud Energy, LTD. | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2006 |
| 43 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 44 | Sun-Key Oil Co., Inc. | Dublin, TX 76446 | Oil & Gas Operator | Mar 2025 |
| 45 | Sundance Consulting Corp. | Abilene, TX 79605 | Oil & Gas Operator | Mar 2025 |
| 46 | Sundance Resources, Inc. | Rio VIsta, TX 76093 | Oil & Gas Operator | Mar 2012 |
| 47 | Swan PC, LP | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 48 | Swan Production Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Nov 2009 |
| 49 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |