| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | East Cheyenne Gas Storage LLC | Oil Operator | Aug 2025 | |
| 2 | Energy Oil And Gas Inc | Oil & Gas Operator | Dec 2010 | |
| 3 | Enerplus Resources USA Corporation | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 4 | Enprop Inc | Oil & Gas Operator | Feb 2013 | |
| 5 | Equity Oil Company | Salt Lake City, UT 84110-095 | Oil & Gas Operator | Aug 2004 |
| 6 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Jun 2025 |