| 1 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 2 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 3 | Sequel Energy, LLC | | Oil & Gas Operator | May 2014 |
| 4 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 5 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 6 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2024 |
| 7 | Southern Union Production Co. | | Oil Operator | Apr 1979 |
| 8 | Southland Royalty Company | Houston, TX 77210 | Oil & Gas Operator | Sep 2011 |
| 9 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Oct 2024 |
| 10 | Specialized Technological Threading, Inc., | | Oil & Gas Operator | Oct 2019 |
| 11 | St. Mary Land & Exploration Co | Denver, CO 80201 | Oil & Gas Operator | Jun 2010 |
| 12 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 13 | Stephens Energy Company LLC | | Oil & Gas Operator | Jun 2012 |
| 14 | Summit Resources, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2016 |