| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | May 2024 |
| 2 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | May 2024 |
| 3 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 4 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 5 | Unswept Oil Company | Corsicana, TX 75151 | Oil & Gas Operator | Jan 2018 |
| 6 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | May 2024 |
| 7 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |