| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Heartland Oil & Gas Company | Oil & Gas Operator | Jun 2000 | |
| 2 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 3 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 4 | Huber Corporation* J M | Oil & Gas Operator | Feb 2008 |