| 1 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 2 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2024 |
| 3 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 4 | Edge Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 1999 |
| 5 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 6 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 7 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 8 | Eex Operating, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 9 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 10 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Dec 2024 |
| 11 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 12 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Dec 2024 |
| 13 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Dec 2024 |
| 14 | Enercorp Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 1993 |
| 15 | Energy Resource Management, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Mar 2008 |
| 16 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Sep 2024 |
| 17 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 18 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2024 |
| 19 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 20 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 21 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 22 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 23 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 24 | Erg Operating Company Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 25 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 26 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Dec 2024 |
| 27 | Erskine Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2007 |
| 28 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 29 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Sep 2024 |
| 30 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 31 | Estate Of James L. Nelson | Pettus, TX 78146 | Oil & Gas Operator | Dec 2024 |
| 32 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 33 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 34 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 35 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2024 |
| 36 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2024 |
| 37 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Dec 2024 |
| 38 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 39 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |