| 1 | Kastle Resources Enterprises Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 2 | Kavouras Thomas | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2023 |
| 3 | Kerr McGee Chem Corp | Oklahoma City, OK 73125-0861 | Gas Operator | Dec 1989 |
| 4 | Keyrock Energy LLC | Johnson City, TN 37604-5749 | Oil & Gas Operator | Dec 2020 |
| 5 | Keystate Inc | Davidsville, PA 15928-9655 | Gas Operator | Dec 2012 |
| 6 | Keystone Acquisitions LLC | Anita, PA 15711-9747 | Gas Operator | Dec 2024 |
| 7 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 8 | Kriebel Gas Inc | Clarion, PA 16214-0765 | Oil & Gas Operator | Dec 1999 |
| 9 | Kriebel Minerals Inc | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2020 |
| 10 | Kriebel Natural Gas Co LLC | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2024 |
| 11 | KSM Energy Inc | Pittsburgh, PA 15238-3156 | Gas Operator | Dec 2023 |
| 12 | Kyle Energy Inc NV | Apollo, PA 15613-0249 | Gas Operator | Dec 1996 |