| 1 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 2 | Walker Corporation (The) | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 3 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 4 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 5 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 6 | Warwick-Bacchus LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 7 | Warwick-Minerva LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 8 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 9 | Weimer & Fitzhugh | Tulsa, OK 74103-4102 | Oil & Gas Operator | Dec 1993 |
| 10 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Mar 2025 |
| 11 | Wellco Production LLC | Purcell, OK 73080-6833 | Oil & Gas Operator | Apr 2025 |
| 12 | Wenexco, Inc. | Streetman, TX 75859 | Oil & Gas Operator | Jun 2025 |
| 13 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Mar 2025 |
| 14 | Wheatland Oil Inc | Enid, OK 73702-1032 | Oil & Gas Operator | Mar 2015 |
| 15 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Mar 2025 |
| 16 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Apr 2025 |
| 17 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 18 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 19 | Whitmar Natural Resources Co | Tulsa, OK 74136-9998 | Oil & Gas Operator | Jun 2004 |
| 20 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 21 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 22 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 23 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 24 | Williams Royce S | Healdton, OK 73438-0306 | Oil & Gas Operator | Apr 2014 |
| 25 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 26 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 27 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 28 | Winchester Oil Corporation | Maysville, OK 73057-0600 | Oil & Gas Operator | Apr 2010 |
| 29 | Windsor Energy Inc | Dallas, TX 75204-3199 | Oil & Gas Operator | May 2006 |
| 30 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Apr 2025 |
| 31 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Apr 2025 |