| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | McCarthy, Lawrence J. | Plains, MT 59859-9215 | Oil & Gas Operator | Nov 2011 |
| 2 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jun 2025 |
| 3 | Montana Land & Mineral Co. | Billings, MT 59105 | Gas Operator | Jun 2025 |
| 4 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 5 | Montana Power Gas Company | Oil & Gas Operator | Apr 2002 |