| 601 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 602 | Whitley Oil & Gas Inc | Owasso, OK 74055 | Oil & Gas Operator | Jun 2009 |
| 603 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Aug 2024 |
| 604 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Nov 2024 |
| 605 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 606 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Sep 2024 |
| 607 | Wolf Creek Enterprises Inc | Stillwater, OK 74074-6965 | Oil Operator | Apr 2009 |
| 608 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 609 | Woodward Iodine Corporation | Woodward, OK 73801 | Oil & Gas Operator | Sep 2024 |
| 610 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Aug 2024 |
| 611 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 612 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2024 |
| 613 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Nov 2024 |
| 614 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Sep 2024 |
| 615 | Yingling Oil, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2000 |
| 616 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 617 | Zeal Production Company | Sperry, OK 74073-4714 | Oil & Gas Operator | Sep 2024 |
| 618 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2024 |
| 619 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |