| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 2 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 3 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 4 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2024 |
| 5 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Sep 2024 |
| 6 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |