| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Landmark Oil & G | Oil Operator | Nov 1987 | |
| 2 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 3 | Lauck D R Oil Co | Oil & Gas Operator | Oct 1995 | |
| 4 | Longhorn Crude, LLC | Jetmore, KS 67854 | Oil Operator | Nov 2025 |