| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | U Bee Tea Production LLC | Culbertson, MT 59218 | Oil & Gas Operator | Aug 2025 |
| 2 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 3 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2025 |
| 4 | United States Energy Corp. | Longview, TX 75601 | Oil & Gas Operator | Mar 2025 |
| 5 | Upton Resources U.S.A. Inc. | Oil & Gas Operator | Oct 2013 | |
| 6 | Ursa Major (Crow Og), LLC | Billings, MT 59101 | Gas Operator | Aug 2017 |