| 1 | K & H Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1995 |
| 2 | K Energy Inc | Mannford, OK 74044-3023 | Oil & Gas Operator | May 2013 |
| 3 | K S & S Oil Company Inc | Terral, TX 73569-5056 | Oil Operator | Feb 2024 |
| 4 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2024 |
| 5 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2024 |
| 6 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 7 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2024 |
| 8 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 9 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Apr 2024 |
| 10 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 11 | Kay Production Company Inc | Bowlegs, OK 74830-0115 | Oil & Gas Operator | Jan 2024 |
| 12 | KCS Resources, LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 13 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Feb 2024 |
| 14 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 15 | Kelley Oil & Gas | McAlester, OK 74570 | Oil & Gas Operator | May 2013 |
| 16 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 17 | Kelly Cook Oil LLC | | Oil & Gas Operator | Jan 2024 |
| 18 | Kemp Roy L | | Oil Operator | Jan 2011 |
| 19 | Ken Snyder Inc | Newalla, OK 74857-7107 | Oil & Gas Operator | Jan 2024 |
| 20 | Kendol Exploration Inc | Oklahoma City, OK 73105-2513 | Oil & Gas Operator | Jan 2024 |
| 21 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 22 | Kimco Oil And Gas | Wewoka, OK 74884-0613 | Oil & Gas Operator | Jul 2016 |
| 23 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2024 |
| 24 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Feb 2024 |
| 25 | KN Production Co. | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2003 |
| 26 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 27 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Apr 2024 |
| 28 | Krumme Oil Company LLP | Bristow, OK 74010-0749 | Oil & Gas Operator | Jan 2024 |
| 29 | Ky Oil Co | Palco, KS 67657 | Oil & Gas Operator | Aug 2000 |
| 30 | Kybenco Disposals LLC | | Oil Operator | Sep 2022 |
| 31 | Kyler Oil Company | Pawhuska, OK 74056-0117 | Oil Operator | Nov 1998 |