| 1 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 2 | Waggoner Drilling Company | Bristow, OK 74010-0663 | Oil & Gas Operator | Jan 2014 |
| 3 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Jul 2025 |
| 4 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 5 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Oct 2025 |
| 6 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Oct 2025 |
| 7 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 8 | Washita Oil And Gas, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 9 | Washita Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2006 |
| 10 | Waterford Energy Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 1998 |
| 11 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 12 | Weiser-Brown Operating Company | Magnolia, AR 71754 | Oil & Gas Operator | Oct 2025 |
| 13 | Wessely Energy Company | Dallas, TX 75206 | Oil & Gas Operator | May 2001 |
| 14 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Jun 2025 |
| 15 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Jul 2025 |
| 16 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 17 | Whitaker Energy Inc | Humble, TX 77346-1798 | Oil & Gas Operator | Jul 2025 |
| 18 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Jul 2025 |
| 19 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 20 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 21 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 22 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 23 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 24 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Oct 2025 |
| 25 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |
| 26 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 27 | Williford Resources, L.L.C. | Tulsa, OK 74136-1020 | Oil & Gas Operator | Jul 2025 |
| 28 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 29 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 30 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jul 2025 |
| 31 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 32 | Worldwide Energy Corp. | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 33 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Jul 2025 |
| 34 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |