| 801 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 802 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2025 |
| 803 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 804 | Williams Royce S | Healdton, OK 73438-0306 | Oil & Gas Operator | Apr 2014 |
| 805 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2025 |
| 806 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 807 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 808 | Windsor Energy Inc | Dallas, TX 75204-3199 | Oil & Gas Operator | May 2006 |
| 809 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jan 2025 |
| 810 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Jan 2025 |
| 811 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2025 |
| 812 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 813 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 814 | Young, Marshall R., Oil Co. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 815 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Jan 2025 |