| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 2 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | May 2025 |
| 3 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 4 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 5 | Exeter Drilling Company | Denver, CO 80217 | Oil & Gas Operator | Sep 1997 |