| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 2 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 3 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Jun 2026 |
| 4 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 5 | NRC Development, LLC | Gas Operator | Nov 2002 |