| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S.B. Street Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 3 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | San Antonio Gas & Oil, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2000 |
| 6 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jul 2025 |
| 7 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 8 | Savannah Ross And Company, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 9 | SBJ Oil & Gas | MC Camey, TX 79752 | Oil & Gas Operator | Feb 2009 |
| 10 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 11 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 12 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 13 | Seago Operating Co., L.L.C. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2011 |
| 14 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 15 | Sentry Exploration, Inc. | Houston, TX 77006 | Oil & Gas Operator | Jul 2025 |
| 16 | Sequoia Natural Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 17 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 18 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 19 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 20 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 21 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 22 | Shoshone Oil Company | Dallas, TX 75244 | Oil & Gas Operator | May 1994 |
| 23 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Jul 2025 |
| 24 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 25 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 26 | Sogc, Inc. | Salt Lake Cty, UT 84131 | Oil & Gas Operator | May 2025 |
| 27 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 28 | Sounion Petroleum Incorporated | Baltimore, MD 21218 | Oil & Gas Operator | Aug 1994 |
| 29 | Southern Alliance Oil Corp. | Grapevine, TX 76099 | Oil & Gas Operator | Jul 2025 |
| 30 | Southern Union Exploration Co. | Austin, TX 78701 | Oil & Gas Operator | Feb 2002 |
| 31 | Southlake Exploration, Inc. | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 32 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 33 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2025 |
| 34 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 35 | Spenergy Corp. | Midland, TX 79701 | Oil & Gas Operator | Dec 1999 |
| 36 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 37 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 38 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Jul 2025 |
| 39 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 40 | Stearns Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Oct 1993 |
| 41 | Stephens Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2025 |
| 42 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 43 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 44 | Sunstone Energy Company | Tulsa, OK 74153 | Oil & Gas Operator | Aug 2009 |
| 45 | Susanna Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 46 | Sutton Oil Co. | Austin, TX 78728 | Oil & Gas Operator | Jul 2025 |
| 47 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Jul 2025 |
| 48 | Sweetwater Production, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2025 |