| 901 | Wise Oil & Gas Company LLC | Shawnee, OK 74801-8507 | Oil & Gas Operator | Feb 2024 |
| 902 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 903 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 904 | Wright Richard | Ratliff City, OK 73481-0155 | Oil & Gas Operator | Mar 2015 |
| 905 | Wylie Henry C | Ratliff City, OK 73481-0102 | Oil Operator | May 2020 |
| 906 | Xae Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2021 |
| 907 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Apr 2026 |
| 908 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2026 |
| 909 | Yarbrough R E | Lago VIsta, TX 78645-0005 | Oil & Gas Operator | Mar 2015 |
| 910 | Young, John H., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 911 | Zafar Oil & Gas, Inc. | Oklahoma City, OK 73132 | Oil Operator | Aug 2013 |
| 912 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 913 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |