| 1 | Eagle Ford Hunter Resources,Inc. | Houston, TX 77024 | Oil & Gas Operator | Apr 2013 |
| 2 | Eastern Oil Corporation | Houston, TX 77070 | Oil & Gas Operator | Oct 2025 |
| 3 | Eclipse Petroleum Corporation | La Grange, TX 78945 | Oil & Gas Operator | Aug 2003 |
| 4 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 5 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 6 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 7 | El Dorado Resources Inc. | Waco, TX 76710 | Oil & Gas Operator | Oct 2009 |
| 8 | Eldon Oil Co. | Three Rivers, TX 78071 | Oil & Gas Operator | Oct 2025 |
| 9 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 10 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 11 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 12 | Elliott Oil Company, L.P. | Magnolia, TX 77354 | Oil & Gas Operator | Oct 2025 |
| 13 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Oct 2025 |
| 14 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Oct 2025 |
| 15 | Eminent Oil & Gas, Inc. | Houston, TX 77077 | Oil & Gas Operator | Oct 2025 |
| 16 | Enco Exploration Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2020 |
| 17 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 18 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 19 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Jul 2025 |
| 21 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 22 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Oct 2025 |
| 23 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 24 | Ensign Operating LLC | Houston, TX 77086 | Oil & Gas Operator | Feb 2023 |
| 25 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 26 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Oct 2025 |
| 27 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 28 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 29 | Estate Of James L. Nelson | Pettus, TX 78146 | Oil & Gas Operator | Oct 2025 |
| 30 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 31 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 32 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Oct 2025 |
| 33 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Oct 2025 |
| 34 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 35 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |