| 1 | S & S Operating Company, Inc. | Winnie, TX 77665 | Oil & Gas Operator | Oct 2025 |
| 2 | S. M. A. Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 1997 |
| 3 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Sanchez-O'Brien Oil & Gas Corp | Houston, TX 77057 | Oil & Gas Operator | May 1998 |
| 6 | Sandalwood Exploration, L.P. | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 7 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 8 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 9 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 10 | Smith Production Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 11 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 12 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 13 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 14 | Southern Oil Of Louisiana LLC | Madisonville, LA 70447 | Oil & Gas Operator | Oct 2025 |
| 15 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 16 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |