| 1 | E P C Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2025 |
| 2 | E.A.T.E. Operating | Natalia, TX 78059 | Oil & Gas Operator | Oct 2025 |
| 3 | Eagle Ford Hunter Resources,Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2013 |
| 4 | Eagle Ford Oil Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 5 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 6 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 7 | Eei Operating Inc. | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 8 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 9 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 10 | Ef Energy, L.L.C. | Houston, TX 77084 | Oil & Gas Operator | Jun 2015 |
| 11 | Eise Oil, Inc. | San Antonio, TX 78213 | Oil Operator | Oct 2025 |
| 12 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 13 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Oct 2025 |
| 14 | Emerald Bay Energy, Inc. | San Antonio, TX 78230 | Oil Operator | Oct 2025 |
| 15 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 16 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 17 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Aug 2025 |
| 19 | Energy Resources Oil & Gas Corp. | Amarillo, TX 79102 | Oil & Gas Operator | Jun 1994 |
| 20 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 21 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 22 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 23 | Enhanced Energy Partners Corp | Tomball, TX 77377 | Oil & Gas Operator | Oct 2025 |
| 24 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 25 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 26 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 27 | EP Energy E&P Company, LLC | Houston, TX 77210 | Oil & Gas Operator | Oct 2025 |
| 28 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 29 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 30 | Escondido Operating, Inc. | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2013 |
| 31 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 32 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 33 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 34 | Everett Oil | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2015 |
| 35 | Everett Oil, Inc. | San Antonio, TX 78258 | Oil Operator | Oct 2025 |
| 36 | Excalibur E & P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Oct 2025 |
| 37 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2025 |
| 38 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 39 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 40 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jul 2025 |