| 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 G Operating | Hennessey, OK 73742 | Oil & Gas Operator | May 1999 |
| 4 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Jun 2025 |
| 5 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 6 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2025 |
| 7 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 8 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jun 2025 |
| 9 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 10 | Keno Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 1995 |
| 11 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 12 | Ketal Oil Producing Company | Fort Worth, TX 76102 | Gas Operator | Sep 1995 |
| 13 | Key Energy Corporation | Enid, OK 73702-5349 | Oil & Gas Operator | Oct 2017 |
| 14 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 15 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 16 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 17 | Kirk David | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 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 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 21 | Koda Operating LLC | Tyler, TX 75703-5596 | Oil & Gas Operator | Jun 2025 |
| 22 | Kolar Petroleum Inc | Oklahoma City, OK 73162-1509 | Oil & Gas Operator | Jun 2007 |
| 23 | Kopco, Inc. | Caney, KS 67333 | Oil & Gas Operator | Jul 2025 |
| 24 | KPL Production Company LLC | Oklahoma City, OK 73112-4709 | Oil & Gas Operator | Feb 2017 |