| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 2 | Union Resources Inc | Oil & Gas Operator | Dec 1996 | |
| 3 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Jan 2024 |
| 4 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2024 |
| 5 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Jan 2024 |
| 6 | United Primary Resources Inc | Milton, WA 98354-9361 | Oil & Gas Operator | Feb 2016 |
| 7 | United States Trading & Trans | Dallas, TX 75380-3342 | Oil & Gas Operator | Dec 1994 |
| 8 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2024 |