| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2 | Oedekoven Water & Hot Oil | Recluse, WY 82725 | Oil & Gas Operator | Mar 2024 |
| 3 | Oilfield Salvage & Service Company | Littleton, CO 80120 | Oil & Gas Operator | Feb 2024 |
| 4 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 5 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 6 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2023 |
| 7 | Oxtex Inc | Oil & Gas Operator | Oct 1989 | |
| 8 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |