| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2024 |
| 2 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | May 2024 |
| 3 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 4 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2024 |
| 5 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | May 2024 |
| 6 | Koch Gateway Pipeline Company | Oil & Gas Operator | Feb 2001 |