| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2 | Ody Oil Corp. | Oil & Gas Operator | Oct 1994 | |
| 3 | Offshore Oil & Gas Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 1994 |
| 4 | Oil & Gas Property MGMT., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Jul 1996 |
| 5 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 6 | Orb Exploration, L.L.C. | Oil & Gas Operator | Jun 2017 | |
| 7 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 8 | Oxtex Inc | Oil & Gas Operator | Oct 1989 | |
| 9 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |