| 601 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Mar 2025 |
| 602 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 603 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Dec 2024 |
| 604 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Jan 2025 |
| 605 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2025 |
| 606 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2024 |
| 607 | Whitaker Raymond | Paul Valley, OK 73075-1041 | Oil & Gas Operator | May 2007 |
| 608 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 609 | White Star Petroleum II LLC | Oklahoma City, OK 73113-1360 | Oil & Gas Operator | Dec 2024 |
| 610 | White Wolf Energy LLC | Richardson, TX 75080-5509 | Oil & Gas Operator | Oct 2022 |
| 611 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 612 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 613 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 614 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 615 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2025 |
| 616 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 617 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 618 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2018 |
| 619 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jan 2025 |
| 620 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 621 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 622 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 623 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2025 |
| 624 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 625 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 626 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Dec 2024 |
| 627 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 628 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 629 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Jan 2025 |
| 630 | Zephyr SWD LLC | Oklahoma City, OK 73118-6035 | Oil Operator | Dec 2024 |
| 631 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 632 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 633 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Dec 2024 |