| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 3 | Saguaro Petroleum, LLC | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 4 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 5 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 6 | Sayers Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2005 |
| 7 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 8 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 9 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 10 | Seely Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 11 | Sharp Image Energy, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Oct 2025 |
| 12 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 13 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 14 | Shenandoah Resources LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 15 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 16 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 17 | Sierra Lima Oil & Gas, LLC | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 18 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 19 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | Oct 2025 |
| 20 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 21 | Smith Energy Operating Company | Lubbock, TX 79423 | Oil & Gas Operator | Oct 2025 |
| 22 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 23 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 24 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 25 | Spi Operations LLC | Midland, TX 79710 | Oil & Gas Operator | Jan 2013 |
| 26 | SSC, Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Oct 2025 |
| 27 | Staley Operating Co. | Midland, TX 79702 | Oil & Gas Operator | Jan 2022 |
| 28 | Stanolind Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2021 |
| 29 | Starkey Oilfield Service, Inc. | Sweet Home, TX 77987 | Oil & Gas Operator | Aug 2004 |
| 30 | Stelzer Drilling Co. Inc. | Post, TX 79356 | Oil Operator | Oct 2025 |
| 31 | Stelzer, E.A. Oil Company | Post, TX 79356 | Oil & Gas Operator | Feb 2002 |
| 32 | Stelzer, J. C. | Post, TX 79356 | Oil & Gas Operator | Dec 1995 |
| 33 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 34 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 35 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 36 | Strawn Energy Services, LLC | Lubbock, TX 79404 | Oil Operator | Oct 2025 |
| 37 | Success Oil Company, Inc. | Beverly Hills, CA 90211 | Oil & Gas Operator | Oct 2025 |
| 38 | Suncoast Investments Co., Inc. | Plano, TX 75074 | Oil & Gas Operator | Oct 2001 |
| 39 | Swanson, Tommy Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Mar 2017 |