| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 601 | Woolf & Magee, Inc. | Oil & Gas Operator | Oct 1991 | |
| 602 | WRT Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | May 1998 |
| 603 | Xplor Energy Operating Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 2012 |
| 604 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |
| 605 | Yentzen Investments, Inc. | Sugar Land, TX 77478 | Oil Operator | May 1993 |
| 606 | Zadeck Energy Group Inc | Oil & Gas Operator | Jun 2013 | |
| 607 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2024 |
| 608 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |