| 901 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 902 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 903 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2024 |
| 904 | Will Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2023 |
| 905 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2024 |
| 906 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 907 | Windward Development LLC | Tulsa, OK 74136-7007 | Oil & Gas Operator | Jul 2019 |
| 908 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 909 | WLW Oil & Gas LLC | Kingfisher, OK 73750-1102 | Oil & Gas Operator | Jan 2024 |
| 910 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 911 | Woodward Iodine Corporation | Woodward, OK 73802-1245 | Oil & Gas Operator | Jan 2024 |
| 912 | Worldwide Energy Corp. | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 913 | WR Oil & Gas LLC | | Oil & Gas Operator | Jan 2024 |
| 914 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Dec 2023 |
| 915 | Xeric Oil & Gas Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2014 |
| 916 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 917 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 918 | Young H Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 1993 |
| 919 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 920 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Dec 2023 |
| 921 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 922 | Zielke Contracting LLC | Balko, OK 73931-1187 | Oil Operator | Jun 2020 |
| 923 | Zimet Brothers Inc | | Oil Operator | Mar 2008 |
| 924 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |