| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Declar Oil & Gas Inc | Oil & Gas Operator | Dec 2012 | |
| 2 | Diamond Operating, Inc. | Oil & Gas Operator | Feb 2022 | |
| 3 | Diamondback Oil Partners LLP | Arvada, CO 80004 | Oil & Gas Operator | Dec 2016 |
| 4 | Diversified Operating Corporation | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 5 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |