| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & D Contract Pumping Inc | Casper, WY 82604 | Oil Operator | Aug 2025 |
| 2 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 3 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 4 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 5 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 6 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 7 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 8 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |