| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M E III Corporation | Oil & Gas Operator | Apr 2022 | |
| 2 | Magpie Operating, Inc | Oil & Gas Operator | Jul 2025 | |
| 3 | Markus Production, Inc | Oil & Gas Operator | Mar 2021 | |
| 4 | Matrix Energy LLC | Oil & Gas Operator | Apr 2013 | |
| 5 | McCartney Engineering LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Aug 2025 |
| 6 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 7 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 8 | Monahan* Rex Family Trust | Oil & Gas Operator | Sep 2010 | |
| 9 | Mountain Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2016 |
| 10 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |