| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 2 | Union Gas Operating Company | Spring, TX 77391 | Oil & Gas Operator | Dec 2025 |
| 3 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 4 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Aug 2025 |
| 5 | Ursus Oil And Gas | Tyler, TX 75703 | Oil & Gas Operator | Dec 2025 |
| 6 | Usfg Oil & Gas, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Dec 2005 |