| 1 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Dec 2025 |
| 2 | S.E.D.I. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2015 |
| 3 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 4 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 5 | Sabine Pipe & Supply Co. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2004 |
| 6 | Sabine Pipe, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 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 | Dec 2025 |
| 11 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 12 | Schlachter, David A. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2015 |
| 13 | SDG Operating Company, Inc | Tyler, TX 75701 | Oil & Gas Operator | Dec 2025 |
| 14 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 15 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 16 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 17 | Sheer Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 18 | Shell Western E&P Inc. | Houston, TX 77001 | Oil & Gas Operator | May 2011 |
| 19 | Sigmon Production Company, Inc. | Longview, TX 75608 | Oil & Gas Operator | Dec 2013 |
| 20 | Signal Oil Company, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 21 | Simples Oil International, LLC | Los Angeles, CA 90067 | Oil & Gas Operator | Dec 2025 |
| 22 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 23 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 24 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 25 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 26 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 27 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 28 | Spicewood Operating Company, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 29 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Dec 2025 |
| 30 | Stonewall Production Company Inc | Tyler, TX 75702 | Oil & Gas Operator | Aug 2009 |
| 31 | Stratco, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 32 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Dec 2025 |
| 33 | Sulphur River Exploration, Inc. | Dallas, TX 75244 | Oil & Gas Operator | Dec 2025 |
| 34 | Sydri Operating, LLC | Dallas, TX 75231 | Oil & Gas Operator | Dec 2025 |