| 801 | Winston Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 802 | Wise Oil & Gas Company LLC | Shawnee, OK 74801-8507 | Oil & Gas Operator | Feb 2024 |
| 803 | Wolverine Petroleum Corp | Holdenville, OK 74848 | Oil & Gas Operator | Jul 1999 |
| 804 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 805 | WPX Energy Mid-Continent Co | Oklahoma City, OK 73102-5010 | Oil & Gas Operator | Apr 2016 |
| 806 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 807 | Wytex Production Corporation | Fort Smith, AR 72903 | Oil & Gas Operator | Dec 2025 |
| 808 | X-Bar LMT Partnership | | Oil & Gas Operator | May 2013 |
| 809 | X-Bar Resources Inc | Holdenville, OK 74848 | Oil & Gas Operator | Jul 2013 |
| 810 | Xae Corporation | Norman, OK 73072 | Oil & Gas Operator | Apr 2021 |
| 811 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Jan 2026 |
| 812 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2026 |
| 813 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2026 |
| 814 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 815 | Young, John H., Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2026 |
| 816 | ZZ Energy LLC | Norman, OK 73070 | Gas Operator | Dec 2025 |