| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 2 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 3 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | Feb 2026 |
| 4 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2026 |
| 5 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2026 |
| 6 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Jan 2026 |
| 7 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |