| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Maney McNeal Oil & Gas | Oil & Gas Operator | Dec 1999 | |
| 2 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2025 |
| 3 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 4 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 5 | Marvin Sanders Oil | Sugar Grove, PA 16350-5612 | Oil & Gas Operator | Dec 2016 |
| 6 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 7 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Jun 2026 |
| 8 | Mead Oil LLC | Oil & Gas Operator | Dec 2025 | |
| 9 | Medina Res Dev Co LLC | Oil & Gas Operator | May 2026 | |
| 10 | Missing Moon Oil Inc | Knox, PA 16232-4507 | Oil & Gas Operator | Dec 2025 |
| 11 | Mitch Well Energy Inc | Oil & Gas Operator | Dec 2012 | |
| 12 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |