| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 2 | Kaneb Energy Company | Oil & Gas Operator | Jan 1986 | |
| 3 | Kaneb Oil & Gas Company | Oil & Gas Operator | Nov 1985 | |
| 4 | Kaneb Operg Co. LTD. PTN. | Oil & Gas Operator | Aug 1988 | |
| 5 | Kash Oil And Gas, Inc | Oil & Gas Operator | Oct 2020 | |
| 6 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 7 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 8 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 9 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 10 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 11 | Knight Resources LLC | Oil & Gas Operator | Dec 2013 | |
| 12 | Koch Gateway Pipeline Company | Oil & Gas Operator | Feb 2001 |