| 1 | Sable Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Nov 1999 |
| 2 | Safari Production Company, Inc. | McAllen, TX 78501 | Oil & Gas Operator | Jul 2025 |
| 3 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Jul 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 6 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 7 | Santa Rosa Operating, LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Jul 2025 |
| 8 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 9 | Shell Western E&P | Houston, TX 77001 | Oil & Gas Operator | Jul 2025 |
| 10 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 11 | Sheridan Energy,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2000 |
| 12 | Shield Petroleum | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 13 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 14 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 15 | Sonat Exploration Co. - Houston | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 16 | South Leeville, LLC | Houston, TX 77069 | Oil & Gas Operator | Oct 2022 |
| 17 | South Texas Limited Partnership | Houston, TX 77060 | Oil & Gas Operator | Feb 1994 |
| 18 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Jul 2025 |
| 19 | Southern G Holdings, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2007 |
| 20 | Southwest Oil & Land, Inc. | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Dec 1999 |
| 21 | Stonegate Operators, Inc. | Addison, TX 75001 | Oil Operator | Jul 2025 |
| 22 | Sue-Ann Operating, L.C. | Victoria, TX 77903 | Oil & Gas Operator | Jul 2025 |
| 23 | Suemaur Expl. & Prod., LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2024 |
| 24 | Suemaur Exploration, Inc. | Corpus Chrsti, TX 78470 | Oil & Gas Operator | Mar 2008 |
| 25 | Synergy Oil & Gas, L.P. | Houston, TX 77024 | Oil & Gas Operator | May 2012 |