| 1 | W M Energy Corp | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2015 |
| 2 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 3 | Wagner & Brown LP | Midland, TX 79702-1714 | Oil & Gas Operator | Aug 2022 |
| 4 | Walsh Jr F Howard | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Feb 2025 |
| 5 | Walsh Jr F Howard Opr Co Inc | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Feb 2016 |
| 6 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 7 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Jun 2025 |
| 8 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 9 | Western Farmers Electric Coop | Anadarko, OK 73005-0429 | Oil & Gas Operator | Apr 2012 |
| 10 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Feb 2025 |
| 11 | Western Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2014 |
| 12 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 13 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2025 |
| 14 | White Oil Company | Cement, OK 73017-0515 | Oil Operator | Jun 2002 |
| 15 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Feb 2025 |
| 16 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 17 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 18 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 19 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 20 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2025 |
| 21 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 22 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Jun 2025 |
| 23 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 24 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 25 | Winston Oil Co | Marietta, OH 45750-754-754 | Oil & Gas Operator | Mar 2025 |
| 26 | WM Energy LLC | Asher, OK 74826 | Oil & Gas Operator | Feb 2025 |
| 27 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 28 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 29 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Mar 2025 |
| 30 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Feb 2025 |