| 1 | Sage Energy Company | San Antonio, TX 78215 | Oil & Gas Operator | Oct 2025 |
| 2 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 3 | Samson Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 4 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 5 | Samuel Gary Jr. & Associates, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 6 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 7 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 8 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jul 2025 |
| 9 | Silver Hill Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 10 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 11 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Oct 2025 |
| 12 | St Oil Company | Denver, CO 80264-2101 | Oil & Gas Operator | Dec 2010 |
| 13 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 14 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 15 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 16 | Stearns Oil Company LLC | Willison, ND 58801 | Oil & Gas Operator | Aug 2025 |
| 17 | Stephens Williston, LLC Dba Seg Williston, LLC | | Oil & Gas Operator | Aug 2025 |
| 18 | Stone Energy Corporation | Denver, CO 80202-2828 | Oil & Gas Operator | Oct 2014 |
| 19 | Sun Exploration-Production Co. | | Oil & Gas Operator | Jan 1990 |
| 20 | Superior Oil Co. | Denver, CO 80217-5444 | Oil & Gas Operator | Feb 2001 |