| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | O'Brien Resources LLC | Shreveport, LA 71136 | Oil Operator | Nov 2017 |
| 2 | Orion Energy Partners LP | Denver, CO 80202 | Oil & Gas Operator | Nov 2010 |
| 3 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 4 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |