| 601 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2025 |
| 602 | Uplands Resources Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Nov 2024 |
| 603 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Mar 2025 |
| 604 | Vaquero Resources, LLC | Edmond, OK 73034 | Oil & Gas Operator | Dec 2024 |
| 605 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2024 |
| 606 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Nov 2024 |
| 607 | W C T Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2024 |
| 608 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 609 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 610 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 611 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Nov 2024 |
| 612 | Wehlu Producers Inc | Edmond, OK 73083-5278 | Oil & Gas Operator | Sep 2002 |
| 613 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Nov 2024 |
| 614 | Wessely Energy Company | Dallas, TX 75206 | Oil & Gas Operator | May 2001 |
| 615 | Wheeler Richard Jr | Oklahoma City, OK 73112-8857 | Oil & Gas Operator | Mar 2005 |
| 616 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Dec 2024 |
| 617 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Dec 2024 |
| 618 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 619 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 620 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 621 | Wilcox Pipe & Supply Co | Oklahoma City, OK 73189 | Oil & Gas Operator | May 2006 |
| 622 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 623 | Wilkison Richard W | Oklahoma City, OK 73107 | Oil Operator | Mar 2011 |
| 624 | Williams Dale And Dorothy Family Trust | Maud, OK 74854-2011 | Oil & Gas Operator | Nov 2024 |
| 625 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 626 | Winston Oil Co | Marietta, OH 45750-754 | Oil & Gas Operator | Nov 2024 |
| 627 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 628 | WM Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2015 |
| 629 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 630 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 631 | Wrather Jr J D | Beverly Hills, CA 90210-4724 | Oil & Gas Operator | Mar 1993 |
| 632 | Wyatt'S Oil Corporation | Pawhuska, OK 74056 | Oil & Gas Operator | Nov 2024 |
| 633 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Nov 2024 |
| 634 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 635 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2024 |
| 636 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 2024 |