| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | K. D. Lankford, Jr & L&N DRLG Co | Gas Operator | Dec 2010 | |
| 2 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2023 |
| 3 | Keystone Fuel Oil Co | Gas Operator | Nov 1997 | |
| 4 | Keystone Productions, LLC | Gas Operator | Dec 2023 |