| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ocean Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2 | Odegard Resources/Omni Exp | Columbus, OH 43207 | Oil & Gas Operator | Sep 1986 |
| 3 | Oil Development Co | Oil & Gas Operator | Jan 1979 | |
| 4 | Oil Inc | Oil & Gas Operator | Dec 1971 | |
| 5 | Olympic Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2004 |
| 6 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 7 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | Sep 2024 |
| 8 | Oso Oil & Gas Properties LLC | Price, UT 84501 | Gas Operator | Jun 2016 |
| 9 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 10 | Oxbow Properties Inc | Centennial, CO 80122-1422 | Oil & Gas Operator | Sep 2024 |