| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | O'Brien Operating Company | Shreveport, LA 71164 | Oil & Gas Operator | Dec 2004 |
| 2 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 3 | Oliditt Production Inc. | Gas Operator | Sep 1998 | |
| 4 | Ouachita Development Corp. | Gas Operator | Mar 2014 | |
| 5 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |