| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H & R Well Services, Inc. | FT Morgan, CO 80701 | Oil & Gas Operator | Apr 2015 |
| 2 | Haley/Hughes Operations | Oil Operator | Apr 2001 | |
| 3 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Aug 2001 |
| 4 | Heartland Oil & Gas Company | Oil & Gas Operator | Jun 2000 | |
| 5 | High Plains Energy LLC | Oil & Gas Operator | May 2017 | |
| 6 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 7 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 8 | Hyndrex Resources | Oil & Gas Operator | Apr 2018 |