| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & R Oil Properties | Oil Operator | May 1998 | |
| 2 | D S & W Well Servicing, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 3 | Daystar Petroleum, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Jul 2024 |
| 4 | Decker Petroleum | Oil & Gas Operator | Oct 2002 | |
| 5 | Don Sims Oil | Oil Operator | Jul 2024 |