| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ohio Kentucky Oil Corporation | Lexington, KY 40503 | Oil & Gas Operator | Dec 2023 |
| 2 | Oil Producers In | Oil & Gas Operator | Dec 1996 | |
| 3 | Okmar Oil Compan | Oil & Gas Operator | Feb 1995 | |
| 4 | Oxford Explorati | Oil & Gas Operator | Mar 1993 | |
| 5 | Oxford Exploration | Oil Operator | Apr 1988 | |
| 6 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |