| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oasis Petroleum North America LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 2 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 3 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 4 | Olympic Exploration & Production Co | Norman, OK 73072 | Oil Operator | May 2003 |
| 5 | Omimex Canada, LTD. | Fort Worth, TX 76120-3608 | Oil & Gas Operator | Jul 2025 |
| 6 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 7 | Outlook Petroleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Jan 2001 |