| 1 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 2 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Aug 2024 |
| 3 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Nov 2024 |
| 4 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Aug 2024 |
| 5 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 6 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 7 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2024 |
| 8 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 9 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 10 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 11 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 12 | Kiester Operating Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Aug 2024 |
| 13 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Sep 2024 |
| 14 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Aug 2024 |
| 15 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Nov 2024 |
| 16 | Koch Midstream Services Company | Wichita, KS 67201 | Oil & Gas Operator | Oct 2000 |
| 17 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 18 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Aug 2024 |
| 19 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Nov 2024 |
| 20 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 21 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Aug 2024 |