| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oilfield Consultants | Oil & Gas Operator | Dec 1987 | |
| 2 | Omimex Petroleum Inc (Co) | Newcastle, WY 82701 | Oil & Gas Operator | May 2001 |
| 3 | Omni Operating Company | Osage, WY 82723 | Oil & Gas Operator | Sep 2001 |
| 4 | Oneida Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2003 |
| 5 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 6 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |