| 1 | S M K Energy Corporation | Corpus Chrsti, TX 78475 | Oil & Gas Operator | Oct 2025 |
| 2 | S N D Energy Company, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Oct 2025 |
| 3 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 4 | Sabine Oil & Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2017 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Savannah Oil Co. | Jefferson, TX 75657 | Oil & Gas Operator | Nov 2007 |
| 7 | SDG Services LLC | Kilgore, TX 75663 | Oil Operator | Oct 2025 |
| 8 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 9 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 10 | Shoco Production, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | May 2020 |
| 11 | Shuler Drilling Co., Inc. | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 12 | Silver Tusk Operating Co. LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2018 |
| 13 | Skinner Energy Management, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Jan 2011 |
| 14 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 15 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 16 | Sloan Oil Corporation | Humble, TX 77347 | Oil & Gas Operator | Mar 2015 |
| 17 | Smith Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 18 | Smith Resources, L.L.C. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 19 | Smith, E.N. III Energy Corp. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2006 |
| 20 | SND Operating, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 21 | Sojourner Drilling Corporation | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 22 | Sonat Exploration Company -Tyler | Houston, TX 77251 | Oil & Gas Operator | Dec 1999 |
| 23 | Sonora Petroleum Corp. | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 24 | Southwestern Energy Prod Co | Houston, TX 77032 | Oil & Gas Operator | Jun 2015 |
| 25 | Spindletop Drilling Co. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 26 | Stetson Petroleum Corp. | Rollins, MT 59931 | Oil & Gas Operator | Oct 2025 |
| 27 | Strago Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 1994 |
| 28 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Oct 2025 |
| 29 | Studley Resources Corporation | Humble, TX 77347 | Oil & Gas Operator | Dec 1996 |
| 30 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |