| 1 | Eagle Ford Oil Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 2025 |
| 2 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 3 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 4 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Jun 2025 |
| 5 | Enco Exploration Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2020 |
| 6 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Apr 2025 |
| 7 | Energy Frontiers Partners, LP | Grapevine, TX 76051 | Oil Operator | May 2008 |
| 8 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 9 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 10 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 11 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 12 | EP Energy E&P Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Jun 2025 |
| 13 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 14 | Escondido Resources GP, LLC | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 15 | Escondido Resources II, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 16 | Escondido Resources Oper Co, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 17 | Essman Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2019 |
| 18 | Estacado Energy, LLC | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2025 |
| 19 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 20 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |
| 21 | Express Oil And Gas | La Grange, TX 78945 | Oil & Gas Operator | Jun 2025 |
| 22 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Jun 2025 |
| 23 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 24 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |