| 1 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 2 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Washita Oil And Gas, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 4 | Washita Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2006 |
| 5 | Western Farmers Electric Coop | Anadarko, OK 73005-0429 | Oil & Gas Operator | Apr 2012 |
| 6 | Western Gas Resources Inc | Denver, CO 80202-1955 | Oil & Gas Operator | Dec 2007 |
| 7 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Feb 2024 |
| 8 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2024 |
| 9 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2024 |
| 10 | White Goat Resources LLC | | Oil & Gas Operator | Feb 2024 |
| 11 | White Stone LLC | Waynoka, OK 73860-4801 | Oil & Gas Operator | Feb 2024 |
| 12 | Whiteman Industries, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2024 |
| 13 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 14 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jan 2024 |
| 15 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2024 |
| 16 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2024 |
| 17 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 18 | Windward Development LLC | Tulsa, OK 74136-7007 | Oil & Gas Operator | Jul 2019 |
| 19 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 20 | Woodward Iodine Corporation | Woodward, OK 73802-1245 | Oil & Gas Operator | Feb 2024 |