| 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 | Dec 2024 |
| 3 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Dec 2024 |
| 4 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 5 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 6 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 7 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Dec 2024 |
| 8 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 9 | Keener Energy Company | Tulsa, OK 74103-4043 | Oil & Gas Operator | Jan 2014 |
| 10 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 11 | Keesee Paul Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 1998 |
| 12 | Keno Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 1995 |
| 13 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 14 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 15 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 16 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 17 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 18 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Jan 2025 |
| 19 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 20 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Jan 2025 |
| 21 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 22 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 23 | Kloberdanz, Paul E. | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 24 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 25 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 26 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Dec 2024 |
| 27 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Mar 2025 |
| 28 | KPL Production Company LLC | Oklahoma City, OK 73112-4709 | Oil & Gas Operator | Feb 2017 |
| 29 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Dec 2024 |
| 30 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |