| 1 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 2 | Eastex Crude Company, LLC | Leesburg, TX 75451 | Oil & Gas Operator | Jul 2025 |
| 3 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 4 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 5 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 6 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 7 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 8 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 9 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Mar 2025 |
| 10 | Engroup Resources, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 11 | Enline Operating, L.L.C. | Houston, TX 77019 | Oil & Gas Operator | Jun 1998 |
| 12 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 13 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 14 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 15 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 16 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 17 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |