| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D K Oil Services LLC | Wellsville, KS 66092 | Oil Operator | Nov 2019 |
| 2 | Damar Resc Incor | Oil Operator | Oct 1995 | |
| 3 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Apr 2025 |
| 4 | Daystar Petroleum, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Jun 2025 |
| 5 | Derrick-Amer Oil | Oil Operator | Dec 1991 | |
| 6 | Deutsch Oil Company | Oil & Gas Operator | Jun 2025 | |
| 7 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 8 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Jan 2025 |