| 901 | Western Natural Resources Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 902 | Wharton Oil Co. | Vernon, TX 76384 | Oil & Gas Operator | Dec 2000 |
| 903 | Wheeler Richard Jr | Oklahoma City, OK 73112-8857 | Oil & Gas Operator | Mar 2005 |
| 904 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Feb 2026 |
| 905 | White Operating Company | Oklahoma City, OK 73159-7136 | Oil & Gas Operator | Feb 2026 |
| 906 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Dec 2025 |
| 907 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 908 | Whitley Oil & Gas Inc | Owasso, OK 74055 | Oil & Gas Operator | Jun 2009 |
| 909 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 910 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 911 | Wildwood Operating LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 912 | William Jefferson Turner | Marlow, OK 73055 | Oil & Gas Operator | Apr 2007 |
| 913 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | Jun 2023 |
| 914 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 915 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 916 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Feb 2026 |
| 917 | Wishbone Oil & Gas | Noble, OK 73068 | Oil & Gas Operator | Mar 2007 |
| 918 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 919 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 920 | Wright Jerry L | Crescent, OK 73028-0474 | Oil & Gas Operator | Jun 2013 |
| 921 | Xae Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2021 |
| 922 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Mar 2026 |
| 923 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 924 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 2026 |
| 925 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 926 | Zap Oil Company | Nowata, OK 74048-2640 | Oil & Gas Operator | Nov 2005 |
| 927 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 928 | Zollinger Veldon | Cresent, OK 73028 | Oil & Gas Operator | Apr 2009 |
| 929 | Zollinger Veldon Inc | Crescent, OK 73028-9280 | Oil & Gas Operator | Nov 2018 |