| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Illini Development Company | Oil & Gas Operator | Dec 2002 | |
| 2 | Imperial Occidental | Oil & Gas Operator | Aug 2025 | |
| 3 | Incremental Oil & Gas USA Holdings Inc | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 4 | Independent Expl Company | Oil & Gas Operator | Dec 2000 | |
| 5 | Inland Petroleum Company | Oil & Gas Operator | Dec 1997 | |
| 6 | Innex California Inc. | Oil & Gas Operator | Sep 2025 | |
| 7 | Instrat Inc. | Oil & Gas Operator | Dec 1992 | |
| 8 | Inter-American Petroleum | Oil & Gas Operator | Dec 2006 | |
| 9 | Intercontinental Tech Group Inc. | Oil & Gas Operator | Dec 2004 | |
| 10 | Irani Engineering | Gas Operator | Dec 1995 | |
| 11 | Island Energy Partners LLC | Gas Operator | Jan 2018 |