| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Mack Oil Corp | Oil & Gas Operator | Nov 1998 | |
| 2 | Mack Oil Corp And Delta Oil Co Inc Great Lakes Nia | Oil & Gas Operator | Feb 1986 | |
| 3 | Mack Oil Corp And Neyer Oil Inc | Oil & Gas Operator | May 1988 | |
| 4 | Maverick Exploration And Production Inc | Oil & Gas Operator | Jan 2026 | |
| 5 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Mar 2026 |
| 6 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Dec 2025 |
| 7 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2026 |
| 8 | Miller Brothers | Oil & Gas Operator | Nov 2000 | |
| 9 | Missaukee Oil And Gas Company LLC | Oil & Gas Operator | Dec 2025 | |
| 10 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |