| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 2 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 3 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 4 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Feb 2024 |
| 5 | Missing Moon Oil Inc | Knox, PA 16232-4507 | Oil & Gas Operator | Dec 2023 |
| 6 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |