| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 3 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 4 | Upland Operating, LLC | Dallas, TX 75226 | Oil & Gas Operator | Mar 2025 |
| 5 | Uvalde Energy Co. | Austin, TX 78747 | Oil & Gas Operator | Nov 1994 |