| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 2 | Griffon Petroleum, Inc. | Calgary, AB T2P 3K2 | Oil & Gas Operator | May 2007 |
| 3 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |