| 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 | Onshore Exp Cor-La Nat Res Inc | Oil & Gas Operator | Oct 1978 | |
| 4 | Opmi Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2008 |
| 5 | Orx Resources, Inc. | Oil & Gas Operator | Dec 2009 | |
| 6 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Nov 2024 |
| 7 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 8 | Osr Oil & Gas Corp | Midland, TX 79710 | Oil & Gas Operator | Jun 2024 |
| 9 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |