| 1 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | May 2024 |
| 2 | Eagle Ford Oil Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 3 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 4 | Eastland Oil Company, The | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 5 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 6 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 7 | El Toro Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2024 |
| 8 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2024 |
| 9 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | May 2024 |
| 10 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Mar 2024 |
| 11 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 12 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 13 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 14 | Energy Frontiers Partners, LP | Grapevine, TX 76051 | Oil Operator | May 2008 |
| 15 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2024 |
| 16 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 17 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 18 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 19 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 20 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 21 | EP Energy E&P Company, LLC | Houston, TX 77210 | Oil & Gas Operator | May 2024 |
| 22 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 23 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 24 | Escondido Resources GP, LLC | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 25 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 26 | Etc Texas Pipeline, LTD. | San Antonio, TX 78258 | Oil Operator | Sep 2023 |
| 27 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | May 2024 |
| 28 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | May 2024 |
| 29 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2023 |
| 30 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 31 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2024 |