| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | O. B. Mobley | Oil & Gas Operator | Jul 1989 | |
| 2 | Occidental Energy Company, Inc. | Houston, TX 77282 | Oil & Gas Operator | Jul 2021 |
| 3 | Odyssey Operating Company | Oil & Gas Operator | Sep 2020 | |
| 4 | Olympic Oil & Gas Co., Inc. | Oil Operator | Apr 1991 | |
| 5 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 6 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |