| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Union Pacific Re | Oil & Gas Operator | Dec 1996 | |
| 2 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Jul 2025 |
| 3 | United Meridian | Oil Operator | Dec 1992 | |
| 4 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |