| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Feb 2026 |
| 2 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 3 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2026 |
| 4 | United Gas Search Inc | Garland, TX 88241 | Oil & Gas Operator | Nov 1993 |
| 5 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 6 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 7 | Upland Production Company | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |