| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S2 Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2023 |
| 3 | Sable Permian Resources Land,LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2019 |
| 4 | Sable Permian Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2021 |
| 5 | Sabre Oil And Gas Corp. | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 6 | Salt Creek Production, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 7 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 8 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 9 | Saxon Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Oct 2009 |
| 10 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 11 | SDX Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 12 | Sedona Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 13 | Selous Energy, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jul 2015 |
| 14 | Sem Operating Company LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 15 | Ser E&P, Inc. | McKinney, TX 75069 | Oil & Gas Operator | Oct 2025 |
| 16 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 17 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 18 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Oct 2025 |
| 19 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 20 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 21 | Silver Oil & Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 22 | Sinclair Energy Corporation | Fort Worth, TX 76177 | Oil & Gas Operator | Oct 2025 |
| 23 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 24 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 25 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 26 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 27 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 28 | Spence Energy Company | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 29 | Sproul, C. R. Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Aug 2000 |
| 30 | SRG Oil Corporation | Abilene, TX 79604 | Oil & Gas Operator | Apr 1994 |
| 31 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 32 | Stanolind Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Apr 2008 |
| 33 | Star Production, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Oct 2025 |
| 34 | Startex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 35 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 36 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 37 | Stephens, Hayseed Oil Inc. | Weatherford, TX 76087 | Oil & Gas Operator | Mar 2008 |
| 38 | Summit Petroleum LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 39 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 40 | Sundown Oil Operating, LLC | Graham, TX 76450 | Oil Operator | Oct 2025 |
| 41 | Supreme Energy Company, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 42 | Swartz Oil Company | San Angelo, TX 76906 | Oil & Gas Operator | Oct 2025 |
| 43 | Swartz, Guy A. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 1993 |
| 44 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 45 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2025 |