| 1 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2024 |
| 2 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 3 | El Paso Natural Gas Company | El Paso, TX 79978 | Oil & Gas Operator | Apr 2013 |
| 4 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Feb 2024 |
| 5 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 6 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Mar 2024 |
| 7 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Jan 2021 |
| 8 | Energen Resources Maq Inc | Birmingham, AL 35203 | Oil & Gas Operator | Sep 2000 |
| 9 | Energetics Inc | Englewood, CO 80155 | Oil & Gas Operator | Aug 1985 |
| 10 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Feb 2024 |
| 11 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 12 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 13 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 14 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 15 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 16 | EOG Y Resources Inc | Artesia, NM 88210 | Oil & Gas Operator | Feb 2019 |
| 17 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 18 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 19 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 20 | Escalera Resources Co | Casper, WY 82602 | Oil & Gas Operator | May 2018 |
| 21 | Euroamerican Energy Group Inc | | Oil & Gas Operator | Oct 1993 |
| 22 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2024 |
| 23 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2024 |