| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 2 | Maverick Exploration And Production Inc | Oil & Gas Operator | Sep 2025 | |
| 3 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Jul 2025 |
| 4 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 5 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 6 | Michigan Production Co LLC | Oil & Gas Operator | Oct 2002 | |
| 7 | Miller Brothers | Oil & Gas Operator | Nov 2000 | |
| 8 | Miller Brothers And Federal Oil Co | Oil Operator | May 1984 | |
| 9 | Miller Brothers And Total Petroleum And Wiser Oil | Oil & Gas Operator | Sep 1991 | |
| 10 | Missaukee Oil And Gas Company LLC | Oil & Gas Operator | Jun 2025 | |
| 11 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 12 | Muskegon Development Company | MT Pleasant, MI 48858 | Oil & Gas Operator | Oct 2025 |
| 13 | Muzyl Oil Corp | Oil & Gas Operator | Aug 2025 |