| 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 | Jul 2025 |
| 3 | K Energy Inc | Mannford, OK 74044-3023 | Oil & Gas Operator | May 2013 |
| 4 | K G Operating | Hennessey, OK 73742 | Oil & Gas Operator | May 1999 |
| 5 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Jun 2025 |
| 6 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 7 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jun 2025 |
| 8 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 9 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 10 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 11 | Kenneth W. Cory, LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jun 2025 |
| 12 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 13 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 14 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 15 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 16 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 17 | Key Energy Corporation | Enid, OK 73702-5349 | Oil & Gas Operator | Oct 2017 |
| 18 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 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 | Jul 2025 |
| 21 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 22 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 23 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 24 | Kodiak Oil & Gas Exploration Inc | Oklahoma City, OK 73134-1046 | Oil & Gas Operator | Jul 2025 |
| 25 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 26 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 27 | KPL Production Company LLC | Oklahoma City, OK 73112-4709 | Oil & Gas Operator | Feb 2017 |
| 28 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 29 | KT Energy Inc | Enid, OK 73702-2365 | Oil & Gas Operator | Jun 2025 |