| 1 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 2 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 3 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 4 | El Paso Field Services Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 5 | Eldon Oil Co. | Three Rivers, TX 78071 | Oil & Gas Operator | Dec 2024 |
| 6 | Electragas, Inc. | Houston, TX 77064 | Oil Operator | Dec 2024 |
| 7 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Dec 2024 |
| 8 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Dec 2024 |
| 9 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Jun 2024 |
| 10 | Energy Acquisitions, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 1996 |
| 11 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 12 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 13 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 14 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 15 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 16 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 17 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 18 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 19 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2024 |
| 20 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Dec 2024 |
| 21 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 22 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 23 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 24 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |