| 1 | Sabinal Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2026 |
| 2 | Samson Exploration LLC | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 3 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 4 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 5 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 7 | Sanchez Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 8 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 9 | Sawtooth, Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2013 |
| 10 | Saxet Exploration Ent. Co., Inc. | Fulshear, TX 77441 | Oil Operator | Feb 2026 |
| 11 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 12 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Seashore Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2026 |
| 14 | Seco Petroleum Corp | Houston, TX 77290 | Oil & Gas Operator | Jan 1997 |
| 15 | Secondary Gas Recovery Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1993 |
| 16 | Shelton, Charles M. | Baytown, TX 77521 | Oil & Gas Operator | Aug 2003 |
| 17 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 18 | Shubuta Oil Corporation | Houston, TX 77056 | Oil & Gas Operator | Sep 1998 |
| 19 | Sideline Oil & Gas, L.P. | Friendswood, TX 77549 | Oil Operator | Feb 2026 |
| 20 | Siempre Energy Operating, LLC | Houston, TX 77094 | Oil Operator | Feb 2026 |
| 21 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Nov 2025 |
| 22 | Silverbrook Operating, LLC | Barker, TX 77413 | Oil & Gas Operator | Feb 2026 |
| 23 | Smith Energy 1986a Partnership | Alvin, TX 77511 | Oil & Gas Operator | Feb 2010 |
| 24 | Smith Oil Co. | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 25 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 26 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 27 | Smith, L C Production | Jacksonville, TX 75766 | Oil Operator | Feb 2026 |
| 28 | Smith, L. C. | Jacksonville, TX 75766 | Oil & Gas Operator | Feb 2026 |
| 29 | Solano Gas Processing, Inc. | Austin, TX 78759 | Oil & Gas Operator | Aug 1998 |
| 30 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 31 | South Houston Production Company | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 32 | Southcoast Production Inc | Houston, TX 77010 | Oil & Gas Operator | Feb 2026 |
| 33 | Spectral Oil & Gas Corporation | Humble, TX 77338 | Oil Operator | Feb 2026 |
| 34 | Stanton Mineral Development Inc | Austin, TX 78759 | Oil & Gas Operator | Feb 2026 |
| 35 | Starr Operating Company | Austin, TX 78759 | Oil & Gas Operator | Feb 2026 |
| 36 | Startap, Inc. | Conroe, TX 77305 | Oil Operator | Feb 2026 |
| 37 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 38 | Stealth Onsite Solutions LLC | Pasadena, TX 77505 | Oil Operator | Feb 2026 |
| 39 | Stewardship Resources | Roanoke, TX 76262 | Oil & Gas Operator | Jun 2022 |
| 40 | Stinger Oil & Gas Inc. | Sherman Oaks, CA 91403 | Oil & Gas Operator | Oct 2013 |
| 41 | SWS | Humble, TX 77338 | Oil Operator | Feb 2026 |