| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 2 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 3 | NFR Bear Paw Basin, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2013 |
| 4 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Mar 2024 |