| 1 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2025 |
| 2 | S.E.D.I. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2015 |
| 3 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 4 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 5 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 6 | Sabine Pipe, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 7 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Lone Star LP | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2007 |
| 10 | Samson Lone Star, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2025 |
| 11 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 12 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Sep 2025 |
| 13 | Schlachter Operating Corporation | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 14 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 15 | Schlachter, David A., Estate Of | Dallas, TX 75225 | Oil & Gas Operator | Jan 2000 |
| 16 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2025 |
| 17 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Sep 2025 |
| 18 | Segrest-Ward Joint Venture | Longview, TX 75606 | Oil & Gas Operator | Jun 2001 |
| 19 | Sei Operating, LLC | Mandeville, LA 70471 | Oil & Gas Operator | Sep 2025 |
| 20 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 21 | Sheer Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 22 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 23 | Shoco Production LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 24 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 25 | SHS Operating Company | Shreveport, LA 71149 | Oil & Gas Operator | Jan 2025 |
| 26 | Sigmon Construction Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 27 | Sigmon Production Company, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2013 |
| 28 | Signal Oil Company, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 29 | Silver Oak Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Dec 2009 |
| 30 | Silver Oak Operating, LLC | Longview, TX 75604 | Oil & Gas Operator | Sep 2025 |
| 31 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | May 2025 |
| 32 | Sinclair Exploration Company | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 33 | Siroco Operating Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2010 |
| 34 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 35 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 36 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Sep 2025 |
| 37 | Smal Energy Corp | Tyler, TX 75710 | Oil & Gas Operator | Oct 1995 |
| 38 | Smith & Marrs Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2021 |
| 39 | Smith Oil Company | Smackover, AR 71762 | Oil Operator | Dec 2024 |
| 40 | Smith Operating & Management Co. | Shreveport, LA 71161 | Oil & Gas Operator | Feb 2005 |
| 41 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2025 |
| 42 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2025 |
| 43 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 44 | Smith, R. E. Interests, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 1998 |
| 45 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 46 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 47 | Sonat Exploration Company-MCR | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 48 | Southern Bay Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 49 | Southlake Operating LLC | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2025 |
| 50 | Southwest Operating, Inc.-Tyler | Tyler, TX 75701 | Oil & Gas Operator | Sep 2025 |
| 51 | Southwest Royalties Inc | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 52 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 53 | Stephens, Glynn | Overton, TX 75684 | Oil & Gas Operator | Oct 2001 |
| 54 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Sep 2025 |
| 55 | Stoneburner Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1997 |
| 56 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Sep 2025 |
| 57 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Sep 2025 |
| 58 | Sun Oil Company | Dallas, TX 75373 | Oil & Gas Operator | Dec 2021 |
| 59 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Sep 2025 |