| 1 | Samson Contour Energy E&P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2017 |
| 2 | Samson Kelley Operating Co., LTD. | | Oil & Gas Operator | Feb 2004 |
| 3 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 4 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 5 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 6 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 7 | Sklar & Phillips Oil Co. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2000 |
| 8 | Sklar Exploration Company LLC | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 9 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 10 | Smith Operating And MGMT Co. | Shreveport, LA 71161 | Oil & Gas Operator | Jun 2023 |
| 11 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 12 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 13 | Sonat Exploration Co. | Houston, TX 77251 | Oil & Gas Operator | Dec 2021 |
| 14 | Southern Natural Gas Co | Houston, TX 77001 | Oil & Gas Operator | Dec 2011 |
| 15 | Southern Natural Gas Company LLC | | Oil & Gas Operator | Nov 2024 |
| 16 | Southwestern Electric Power Co | Dallas, TX 75266 | Oil & Gas Operator | Dec 1989 |
| 17 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 18 | Strand Energy, L.C. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 19 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 20 | Stroud Production LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 21 | Sugar Creek Environmental, LLC | | Oil Operator | Jan 2025 |
| 22 | Sugar Creek Producing Company | | Oil & Gas Operator | Dec 2010 |
| 23 | Sunland Production Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2025 |
| 24 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |