| 601 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2024 |
| 602 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2024 |
| 603 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 604 | Wise James W | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 1996 |
| 605 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 606 | WN Operating Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Sep 2024 |
| 607 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 608 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 609 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Sep 2024 |
| 610 | Wroten Wiley Jr | Dallas, TX 75252 | Oil & Gas Operator | Jun 1994 |
| 611 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Oct 2024 |
| 612 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 613 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Oct 2024 |
| 614 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 615 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2024 |
| 616 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Sep 2024 |
| 617 | Zimtex Energy LLC | Perryton, TX 79070-5818 | Oil & Gas Operator | Nov 2017 |
| 618 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |