| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Oct 2025 |
| 2 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 3 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 4 | U.S.A. Plugging Company | Pearsall, TX 78061 | Oil & Gas Operator | Oct 2025 |
| 5 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 6 | USA Superior Energy LLC | Houston, TX 77077 | Oil Operator | Mar 2010 |
| 7 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |