| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Union Pacific Re | Oil & Gas Operator | Dec 1996 | |
| 2 | Universal Resour | Oil & Gas Operator | Dec 1996 | |
| 3 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 4 | Unrein Oil Co | Oil Operator | Jun 2025 |