| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2024 |
| 2 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 3 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2024 |
| 4 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 5 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Dec 2024 |
| 6 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Dec 2024 |
| 7 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 8 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Oct 2024 |
| 9 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 10 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Sep 2024 |
| 11 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 12 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 13 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 14 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 15 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 16 | Eurotex Royalty, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Aug 2003 |
| 17 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Dec 2024 |
| 18 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2024 |
| 19 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Dec 2024 |
| 20 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |