| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 2 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2024 |
| 3 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 4 | Edge, Fred Well Service Co. | Archer City, TX 76351 | Oil & Gas Operator | May 2024 |
| 5 | Eldred Prod And Consulting, LLC | Nocona, TX 76255 | Oil Operator | May 2024 |
| 6 | Eleon Operators, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2024 |
| 7 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 8 | Empire Oil Company | Coppell, TX 75019 | Oil & Gas Operator | May 2024 |
| 9 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 10 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 11 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 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 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 16 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 17 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 18 | Esp Energy, LLC | Nocona, TX 76255 | Oil Operator | May 2024 |
| 19 | Everest Energy LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2023 |
| 20 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | May 2024 |
| 21 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | May 2024 |
| 22 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | May 2024 |
| 23 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | May 2024 |