| 1 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2024 |
| 2 | Kek Operating LLC | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 3 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 4 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2023 |
| 5 | Keystone Petroleum GP LLC | Irving, TX 75039 | Oil & Gas Operator | May 2012 |
| 6 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 7 | Kimbell Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 8 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 9 | Kimsey, Roy E., Jr. | Midland, TX 79701 | Oil & Gas Operator | May 2018 |
| 10 | Kinder Morgan Production Co LLC | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 11 | Kindred Petroleum Company | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 12 | King Operating Corporation | Pampa, TX 79066 | Oil & Gas Operator | May 2024 |
| 13 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 14 | Kinney Incorporated | Andrews, TX 79714 | Oil & Gas Operator | May 2024 |
| 15 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 16 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | May 2024 |