| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Damar Resc Incor | Oil Operator | Oct 1995 | |
| 2 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Aug 2025 |
| 3 | Darrah Oil Company, LLC | Wichita, KS 67201 | Oil & Gas Operator | Jun 2026 |
| 4 | Denis Roberts Oil | Oil Operator | Jan 2026 | |
| 5 | Diamond Chemical | Oil & Gas Operator | Jan 1995 | |
| 6 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Feb 2026 |
| 7 | Dreiling Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2018 |