| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | I. J. Wilhite | Oil Operator | Apr 2000 | |
| 2 | I. J. Wilhite & Star Drilling, Inc. | Oil Operator | Sep 1973 | |
| 3 | Imperial Oil Of North Dakota, Inc. | Oil & Gas Operator | Jul 2023 | |
| 4 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 5 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 6 | Investors Oil, Inc. | Oil Operator | Mar 1985 | |
| 7 | Iron Oil Operating, LLC | Oil & Gas Operator | Mar 2025 |