| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oasis Production Co., Inc. | Oil & Gas Operator | Jun 1988 | |
| 2 | Oilwell Acquisition Co. | Oil & Gas Operator | Jun 1999 | |
| 3 | Onshore Pipeline Const Co Inc | Oil & Gas Operator | Aug 1998 | |
| 4 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |