| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 2 | Underwood Oil And Gas LLC | Chandler, OK 74834-1414 | Oil & Gas Operator | Feb 2025 |
| 3 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 4 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Jan 2025 |
| 5 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2025 |
| 6 | United States Trading & Trans | Dallas, TX 75380-3342 | Oil & Gas Operator | Dec 1994 |
| 7 | United Western Energy Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 1994 |