| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Illini Development Company | Oil & Gas Operator | Dec 2002 | |
| 2 | Instrat Inc. | Oil & Gas Operator | Dec 1992 | |
| 3 | Irani Engineering | Gas Operator | Dec 1995 | |
| 4 | Island Energy Partners LLC | Gas Operator | Jan 2018 |