| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Global Natural R | Oil & Gas Operator | Oct 1990 | |
| 2 | Graham-Michaelis | Oil & Gas Operator | Nov 1996 | |
| 3 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 4 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Dec 2023 |