| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 2 | Union Crude Operating Co. | Baytown, TX 77521 | Oil Operator | Aug 2003 |
| 3 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 4 | Union Seaboard Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 5 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2024 |
| 6 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2024 |
| 7 | Utility Ventures Company | Pasadena, TX 77504 | Oil & Gas Operator | Dec 2024 |