| 1 | Eagle Ford Oil Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 2 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2024 |
| 3 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 4 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 5 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 6 | Ef Energy, L.L.C. | Houston, TX 77084 | Oil & Gas Operator | Jun 2015 |
| 7 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 8 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | May 2024 |
| 9 | Emlou Oil Co. | Atascosa, TX 78002 | Oil & Gas Operator | Jul 2011 |
| 10 | Energy Corporation Of America | Charleston, WV 25311 | Oil & Gas Operator | Dec 2022 |
| 11 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Feb 2024 |
| 12 | Energy Frontiers Partners, LP | Grapevine, TX 76051 | Oil Operator | May 2008 |
| 13 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 14 | Enhanced RS, Inc. | Luling, TX 78648 | Oil Operator | May 2024 |
| 15 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 16 | EP Energy E&P Company, LLC | Houston, TX 77210 | Oil & Gas Operator | May 2024 |
| 17 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 18 | Ernest Operating Company | Rockdale, TX 76567 | Oil & Gas Operator | May 2024 |
| 19 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | May 2024 |
| 20 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | May 2024 |
| 21 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jan 2024 |
| 22 | Explo Oil Inc | Dallas, TX 75251 | Oil & Gas Operator | May 2024 |
| 23 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | May 2024 |
| 24 | Express Oil And Gas | La Grange, TX 78945 | Oil & Gas Operator | May 2024 |
| 25 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2024 |
| 26 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |