| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Occidental Energy MKT Inc | Houston, TX 77001 | Oil & Gas Operator | Jan 2011 |
| 2 | Oex-1 LLC | Tulsa, OK 74105-5153 | Oil & Gas Operator | Dec 2023 |
| 3 | Oil Production Management Inc | Squaw Valley, CA 93675-9725 | Oil & Gas Operator | Dec 2002 |
| 4 | Oil Production Systems Inc | Cushing, OK 74023 | Oil & Gas Operator | Jan 2013 |
| 5 | Oil Ventures LTD | Oil & Gas Operator | Jan 2013 | |
| 6 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 7 | Oklahoma Oil & Gas MGMT Inc | Oil & Gas Operator | Jan 2024 | |
| 8 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 9 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 10 | Orason Resources Inc | Tulsa, OK 74169-1225 | Oil & Gas Operator | Nov 2006 |
| 11 | Orion Exploration Partners LLC | Oil & Gas Operator | Jul 2020 |