| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 2 | Union Gas Operating Company | Houston, TX 77014 | Oil & Gas Operator | Apr 2024 |
| 3 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 4 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 5 | Uosi Operating, Inc. | Lovelady, TX 75851 | Oil & Gas Operator | Apr 2024 |
| 6 | Upstream Resource Partners, LLC | Palestine, TX 75803 | Oil Operator | Apr 2024 |