| 1 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 2 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 3 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 4 | Salida Exploration, LLC | Abilene, TX 79603 | Oil & Gas Operator | Oct 2025 |
| 5 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 6 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 7 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 8 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 9 | Sauder Management Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 10 | Schalk Oil Company, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 11 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 12 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 13 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 14 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 15 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 16 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Oct 2025 |
| 17 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 18 | Sinclair Oil Corporation | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Aug 2006 |
| 19 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 20 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 21 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 22 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 23 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 24 | Spalding Energy, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 25 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 26 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 27 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 28 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Oct 2025 |
| 29 | St. Clair Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Mar 2008 |
| 30 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 31 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 32 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 33 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 34 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 35 | Sweet Crude Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 36 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |