| 1 | K L Production Services LLC | Duncan, OK 73533-3409 | Oil & Gas Operator | Nov 2019 |
| 2 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 3 | Kandletop Operating, LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | May 2025 |
| 4 | Kantor Oil Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 5 | Kate F H | Oklahoma City, OK 73122 | Oil & Gas Operator | Jun 2000 |
| 6 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Apr 2025 |
| 7 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 8 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 9 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 10 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 11 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 12 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 13 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 14 | Kiamichi Resources Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | Feb 2016 |
| 15 | Kiester Operating Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Mar 2025 |
| 16 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 17 | King Energy LLC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | May 2025 |
| 18 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | May 2025 |
| 19 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 20 | Kirkpatrick Ronald B | | Oil & Gas Operator | Jul 2013 |
| 21 | KLBW Partners LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Apr 2025 |
| 22 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | May 2025 |
| 23 | Knutson Production Company | Loco, OK 73442-9706 | Oil & Gas Operator | Apr 2025 |
| 24 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 25 | Kodiak Oil & Gas Inc | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 26 | Kolibri Energy Us, Inc. | Thousand Oaks, CA 91320-1272 | Oil & Gas Operator | Apr 2025 |
| 27 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |