| 1 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 2 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 3 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 4 | Edp Management Company | Houston, TX 77056 | Oil & Gas Operator | Jul 2018 |
| 5 | Edwards Petroleum Company | Houston, TX 77092 | Oil & Gas Operator | Aug 2003 |
| 6 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 7 | Elp Production Company LLC | Dallas, TX 75287 | Oil Operator | May 2024 |
| 8 | Enco Resources Inc. | Kingwood, TX 77325 | Oil & Gas Operator | May 2024 |
| 9 | Endeavor Natural Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 10 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 11 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 12 | Energy Oil & Gas Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2024 |
| 13 | Energy Reserves Group LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2018 |
| 14 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 15 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 16 | Erg Operating Company Inc | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 17 | Erg Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2015 |
| 18 | Eros Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 19 | Estes Operating, Inc. | San Antonio, TX 78210 | Oil & Gas Operator | Mar 2002 |
| 20 | Estes Operating, LLC | La Porte, TX 77571 | Oil & Gas Operator | May 2024 |
| 21 | Etm Operating Company, Inc. | Houston, TX 77079 | Oil Operator | Feb 2009 |
| 22 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |