| 1 | Earthstone Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2025 |
| 2 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 3 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 4 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Jun 2025 |
| 5 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 6 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 7 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 8 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Jun 2025 |
| 9 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Apr 2025 |
| 10 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Jun 2025 |
| 11 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 12 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 13 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 14 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 15 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 16 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 17 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 18 | Ernest Operating Company | Rockdale, TX 76567 | Oil & Gas Operator | Jun 2025 |
| 19 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 20 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 21 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 22 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 23 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2025 |
| 24 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2025 |
| 25 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Jun 2025 |
| 26 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |