| 1 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 2 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 3 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 4 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 5 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 6 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2024 |
| 7 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 8 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 9 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 10 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 11 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 12 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |