| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 2 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 3 | Elysium Jennings, LLC | Oil & Gas Operator | Dec 2023 | |
| 4 | Enerco Exploration & MGMT. Co. | Oil & Gas Operator | Aug 1981 | |
| 5 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jan 2024 |
| 6 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 7 | Enervest Production Partners, LTD. | Gas Operator | Dec 2023 | |
| 8 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 9 | Equitable Petroleum Corp. | Oil & Gas Operator | Jan 1999 | |
| 10 | Ergon, Inc. | Oil & Gas Operator | Dec 2005 |