| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Mancal Resources Corporation | Oil & Gas Operator | Aug 2019 | |
| 2 | Mar-Win Development Co. | Oil & Gas Operator | Nov 1988 | |
| 3 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 4 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 5 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 6 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 7 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Aug 2025 |