| 1 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Feb 2026 |
| 2 | Sandia Operating Corp. | San Antonio, TX 78270 | Oil & Gas Operator | May 2010 |
| 3 | Sedona Oil & Gas Corporation | Dallas, TX 75231 | Oil & Gas Operator | Feb 2026 |
| 4 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Feb 2026 |
| 5 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 6 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 7 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Feb 2026 |
| 8 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 9 | Spirit Energy L.L.C. | Caddo Mills, TX 75135 | Oil & Gas Operator | Dec 2018 |
| 10 | Spruiell Drilling Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 11 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 12 | Staley Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2000 |
| 13 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 14 | Stringer Oil & Gas Co., Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 1996 |
| 15 | Subsurface Production, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 16 | Sullivan, Hollis R. Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2009 |
| 17 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2026 |