| 1 | K & L Gas & Oil | Homer City, PA 15748-6033 | Gas Operator | Dec 2007 |
| 2 | K & L Gas & Oil Inc | Homer City, PA 15748-6033 | Oil & Gas Operator | Dec 2018 |
| 3 | K. Petroleum, Inc. | Gahanna, OH 43230 | Oil & Gas Operator | Dec 2025 |
| 4 | Kaib & Kaib | Zanesville, OH 43701-6251 | Gas Operator | Dec 2025 |
| 5 | Kastle Resources Enterprises Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 6 | Kavouras Thomas | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2023 |
| 7 | KCS Energy Inc | Warren, PA 16365-0187 | Oil & Gas Operator | Dec 2025 |
| 8 | Keane Dev | Bradford, PA 16701-3901 | Oil & Gas Operator | Dec 1998 |
| 9 | Keck Timothy A | Summerville, PA 15864-6301 | Gas Operator | Dec 2014 |
| 10 | Keith McClure | Waynesburg, PA 15370-3636 | Oil & Gas Operator | Dec 2025 |
| 11 | Kerpoe Stanley J | Tonawanda, NY 14150-8114 | Oil & Gas Operator | Dec 1989 |
| 12 | Kerr McGee Chem Corp | Oklahoma City, OK 73125-0861 | Gas Operator | Dec 1989 |
| 13 | Keyrock Energy LLC | Johnson City, TN 37604-5749 | Oil & Gas Operator | Dec 2024 |
| 14 | Keystate Inc | Davidsville, PA 15928-9655 | Gas Operator | Dec 2012 |
| 15 | Keystone Acquisitions LLC | Anita, PA 15711-9747 | Gas Operator | Dec 2025 |
| 16 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 17 | Keystone Land Resources Inc | St Clairsville, OH 43950 | Oil & Gas Operator | Dec 2025 |
| 18 | Keystone Resources Inc | Cranberry Township, PA 16066-6446 | Gas Operator | Dec 1992 |
| 19 | Kidder Exploration Inc | Jamestown, NY 14701-5613 | Gas Operator | Dec 1991 |
| 20 | Kimmel Glenn | Shelocta, PA 15774-2233 | Gas Operator | Dec 2024 |
| 21 | King Harry L | Parker, PA 16049-0288 | Oil & Gas Operator | Dec 1993 |
| 22 | Kis Oil & Gas Inc | Brookville, PA 15825-4210 | Oil & Gas Operator | Dec 2014 |
| 23 | Koebley Timothy W | Warren, PA 16365-2102 | Oil & Gas Operator | Dec 2025 |
| 24 | Kriebel Acquisition Co LLC | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2025 |
| 25 | Kriebel Gas Inc | Clarion, PA 16214-0765 | Oil & Gas Operator | Dec 1999 |
| 26 | Kriebel Minerals Inc | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2020 |
| 27 | Kriebel Natural Gas Co LLC | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2025 |
| 28 | KSM Energy Inc | Pittsburgh, PA 15238-3156 | Gas Operator | Dec 2024 |
| 29 | Kuzemchak Theodore J | Clymer, PA 15728-7910 | Gas Operator | Dec 2025 |
| 30 | Kylander Oil Inc | Warren, PA 16365-4366 | Oil & Gas Operator | Dec 2025 |
| 31 | Kyle Energy Inc NV | Apollo, PA 15613-0249 | Gas Operator | Dec 1996 |