| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | E. P. Alexander | Oil Operator | Jan 1984 | |
| 2 | E. P. Alexander, Et Al | Oil Operator | Jan 1984 | |
| 3 | Eddie Mayo | Oil Operator | Jun 2006 | |
| 4 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 5 | Emerge Operating, LLC | Oil & Gas Operator | Jul 2025 | |
| 6 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 7 | Endurance Operating LLC | Oil & Gas Operator | Dec 2024 | |
| 8 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 9 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 10 | Est. Of H. L. Hunt | Oil & Gas Operator | Jun 1983 | |
| 11 | Ethyl Properties Inc. | Oil & Gas Operator | Aug 1989 | |
| 12 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |