| 601 | Wilcox Pipe & Supply Co | Oklahoma City, OK 73189 | Oil & Gas Operator | May 2006 |
| 602 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Sep 2026 |
| 603 | Wilkison Richard W | Oklahoma City, OK 73107 | Oil Operator | Mar 2011 |
| 604 | Williams Dale And Dorothy Family Trust | Maud, OK 74854-2011 | Oil & Gas Operator | Jun 2026 |
| 605 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 606 | Winston Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Jun 2026 |
| 607 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 608 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 609 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 610 | Wrather Jr J D | Beverly Hills, CA 90210-4724 | Oil & Gas Operator | Mar 1993 |
| 611 | Wyatt'S Oil Corporation | | Oil & Gas Operator | Jun 2026 |
| 612 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 613 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 614 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Jul 2026 |
| 615 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2026 |