| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 2 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 3 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 4 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 5 | Elison Oil & Gas, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Oct 1999 |
| 6 | Ellora Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 7 | Ellora Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 8 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 9 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 10 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 11 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 12 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 13 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Sep 2024 |
| 14 | Enerquest Corporation | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 15 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 16 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 17 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 18 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 19 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 20 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 21 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |