| 1 | Sahara Operating Company | Midland, TX 79704 | Oil & Gas Operator | Nov 2025 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 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 | Nov 2025 |
| 6 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 7 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Nov 2025 |
| 8 | Santa Fe Energy Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 9 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 10 | Schlagal, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2016 |
| 11 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 12 | Scythian, LTD. | Midland, TX 79701 | Oil & Gas Operator | Dec 2020 |
| 13 | Se USA Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 14 | Seaboard Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 15 | Shackelford,Frank Oil Properties | Midland, TX 79701 | Oil & Gas Operator | Aug 1997 |
| 16 | Shale Energy LLC | Jeffersonville, KY 40337 | Oil Operator | Dec 2018 |
| 17 | Shenandoah Petroleum Corporation | Midland, TX 79705 | Oil & Gas Operator | Nov 2025 |
| 18 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | Nov 2025 |
| 19 | Shifflett Operating Company | Snyder, TX 79550 | Oil & Gas Operator | Nov 2025 |
| 20 | Siegfried R H Inc | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2008 |
| 21 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Nov 2025 |
| 22 | Six-S Properties, Inc. | Austin, TX 78767 | Oil & Gas Operator | Nov 2025 |
| 23 | Slant Operating, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Nov 2025 |
| 24 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Nov 2025 |
| 25 | SMC Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 26 | Smith Brothers Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 27 | Smith Pipe Of Abilene | Abilene, TX 79608 | Oil & Gas Operator | Nov 2025 |
| 28 | Snow Oil & Gas Inc. | Andrews, TX 79714 | Oil & Gas Operator | Nov 2025 |
| 29 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 30 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Nov 2025 |
| 31 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 32 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 33 | Spiral Energy Corp. | Midland, TX 79705 | Oil & Gas Operator | Dec 2019 |
| 34 | Spirit O&G Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Nov 2025 |
| 35 | Spur Energy | Midland, TX 79708 | Oil & Gas Operator | Mar 1996 |
| 36 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 37 | Stagg Investment Group, Inc. | Midland, TX 79701 | Oil Operator | May 2013 |
| 38 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 39 | Stasney, H. R. & Sons, LTD. | Albany, TX 76430 | Oil & Gas Operator | Nov 2025 |
| 40 | Steller Energy & Investment Corp | Plano, TX 75093 | Oil & Gas Operator | Feb 2021 |
| 41 | Stephens, Autry C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2023 |
| 42 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Nov 2025 |
| 43 | Summit Petroleum LLC | Midland, TX 79705 | Oil & Gas Operator | Nov 2025 |