| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 601 | Yingling Oil, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2000 |
| 602 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 603 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Dec 2025 |
| 604 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 605 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |