| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | McCluskey J Sterling | New York, NY 10128-1008 | Gas Operator | Dec 1989 |
| 2 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Apr 2026 |
| 3 | Medina Res Dev Co LLC | Oil & Gas Operator | Apr 2026 | |
| 4 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 5 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 6 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 7 | Mid Amer Natural Resources Inc | Gas Operator | Dec 1994 | |
| 8 | Mitch Well Energy Inc | Waterford, PA 16441-8143 | Oil & Gas Operator | Dec 2012 |
| 9 | Mutual Oil & Gas Co | Akron, OH 44311 | Oil & Gas Operator | Dec 2000 |