| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 2 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 3 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 4 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 5 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 6 | Upp Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |