| 901 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 902 | Williams Reid Oil Co | Dallas, TX 75234 | Oil & Gas Operator | Jan 2025 |
| 903 | Wilshire Enterprises Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 904 | Wilshire Oil LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Oct 2024 |
| 905 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 906 | Wishbone Oil & Gas | Noble, OK 73068 | Oil & Gas Operator | Mar 2007 |
| 907 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Feb 2025 |
| 908 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 909 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 910 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Feb 2025 |
| 911 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Jan 2025 |
| 912 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Feb 2025 |
| 913 | Y D F Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 2025 |
| 914 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2025 |
| 915 | Young Tommy Oil Inc | Woodward, OK 73802-0893 | Oil & Gas Operator | Jan 2025 |
| 916 | Z G Operating LLC | Oklahoma City, OK 73134-5038 | Oil & Gas Operator | Nov 2009 |
| 917 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 918 | Zeiders Bros Oil & Gas Co LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 919 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Feb 2025 |
| 920 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 921 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Feb 2025 |