| 1 | K & K Oil Co. | Corsicana, TX 75109 | Oil & Gas Operator | Mar 2025 |
| 2 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 3 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 4 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Mar 2025 |
| 5 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 6 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 7 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 8 | Killer Rabbit Fields LLC | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 9 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 10 | Kindee Oil & Gas Texas, LLC | Houston, TX 77084 | Oil & Gas Operator | Apr 2016 |
| 11 | Kindred Petroleum Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 12 | King Energy Resources | Kerrville, TX 78029 | Oil & Gas Operator | Mar 2025 |
| 13 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 14 | Knox Industries, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Mar 2025 |
| 15 | Kodiak Productions LTD | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2014 |
| 16 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 17 | Ksabe Energy Partners, LLC | Oklahoma City, OK 73106 | Oil Operator | Mar 2025 |
| 18 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2023 |