| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 2 | DCD Inc | Gillette, WY 82716 | Oil & Gas Operator | Aug 2003 |
| 3 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 4 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Aug 2025 |
| 5 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |