| 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 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 4 | United Energy, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2002 |
| 5 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 6 | Upland Resources LLC | Canadian, TX 79014 | Oil & Gas Operator | Dec 2025 |
| 7 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |