| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Union Crude Company | Baytown, TX 77521 | Oil & Gas Operator | Apr 2018 |
| 2 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 3 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2024 |
| 4 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 5 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |