| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Zadeck Energy Group Inc | Oil & Gas Operator | Dec 2011 | |
| 2 | Zeit Exploration Co., Inc. | Oil & Gas Operator | May 1994 | |
| 3 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 4 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |