| 1 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 2 | Wavefront Energy & Envir Serv USA Inc | Edmonton, AB T6B3P6 | Oil Operator | Apr 2015 |
| 3 | Well Renewal Inc | Tulsa, OK 74103-0091 | Oil Operator | Mar 2015 |
| 4 | Westamerica Corporation | Dewey, OK 74029-0040 | Oil & Gas Operator | Aug 1999 |
| 5 | Westend Operating LLC | | Oil Operator | Dec 2023 |
| 6 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Feb 2024 |
| 7 | Williamson Gregory L | Skiatook, OK 74070-0028 | Oil & Gas Operator | Mar 2015 |
| 8 | Windward Development LLC | Tulsa, OK 74136-7007 | Oil & Gas Operator | Jul 2019 |
| 9 | Wise Oil & Gas Company LLC | Shawnee, OK 74801-8507 | Oil & Gas Operator | Jan 2024 |
| 10 | Woodward Iodine Corporation | Woodward, OK 73802-1245 | Oil & Gas Operator | Feb 2024 |
| 11 | Woolever Stephen L | Tulsa, OK 74108-2303 | Oil Operator | Jun 2023 |
| 12 | Worstell Michael H | Collinsville, OK 74021-5918 | Oil Operator | Mar 2015 |
| 13 | Worstell Oil & Gas Company | Collinsville, OK 74021 | Oil Operator | Nov 2005 |
| 14 | Worstell Oil Co LLC | | Oil Operator | Aug 2023 |
| 15 | WP Oil LLC | | Oil Operator | Jan 2024 |