| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M E III Corporation | Oil & Gas Operator | Apr 2022 | |
| 2 | Machii-Ross Petroleum Co | Oil & Gas Operator | Apr 2014 | |
| 3 | Magpie Operating, Inc | Oil & Gas Operator | Feb 2024 | |
| 4 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 5 | Markus Production, Inc | Oil & Gas Operator | Mar 2021 | |
| 6 | Matrix Energy LLC | Oil & Gas Operator | Apr 2013 | |
| 7 | McCartney Engineering LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Feb 2024 |
| 8 | MDS Energy Development LLC | Oil & Gas Operator | Feb 2024 | |
| 9 | Mendell Niobrara LLC | Oil & Gas Operator | Apr 2017 | |
| 10 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 11 | Mineral Resources, Incorporated | Lewisville, TX 75029 | Oil & Gas Operator | Apr 2024 |
| 12 | Monago Operating Inc | Oil & Gas Operator | Mar 2017 | |
| 13 | Monahan* Rex Family Trust | Oil & Gas Operator | Sep 2010 |