| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Union Pacific Re | Oil & Gas Operator | Dec 1996 | |
| 2 | Union Pacific Resour | Oil & Gas Operator | Apr 2002 | |
| 3 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 4 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |