| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | M & K Oil Company LLC | Gillette, WY 82716 | Oil & Gas Operator | Aug 2025 |
| 2 | M & K Oil Operations | Oil & Gas Operator | Sep 1994 | |
| 3 | M W Petroleum Company | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 4 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 5 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 6 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 7 | Michigan-Wisconsin Pipe Line Co | Oil & Gas Operator | Dec 1983 | |
| 8 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |