| 1 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 2 | K Energy Inc | Mannford, OK 74044-3023 | Oil & Gas Operator | May 2013 |
| 3 | K O G Production LLC | Freedom, OK 73842 | Oil & Gas Operator | Jul 2025 |
| 4 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Jun 2025 |
| 5 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 6 | Kanokla Oil & Gas Corporation | Wellington, KS 67152-0444 | Oil & Gas Operator | Jun 2025 |
| 7 | Katsco Energy, Inc. | Round Rock, TX 78664 | Oil & Gas Operator | Oct 2025 |
| 8 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jun 2025 |
| 9 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 10 | Kelt Oil & Gas | Houston, TX 77060 | Oil & Gas Operator | Dec 1998 |
| 11 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 12 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 13 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 14 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 15 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jun 2025 |
| 16 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 17 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 18 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 19 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Jul 2025 |
| 20 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 21 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 22 | Kolibri Energy Us, Inc. | Thousand Oaks, CA 91320-1272 | Oil & Gas Operator | Jun 2025 |
| 23 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Jun 2025 |