| 501 | VRC Oil & Gas Operating Co | Oklahoma City, OK 73116-1431 | Oil & Gas Operator | Jun 2019 |
| 502 | VRK Oil And Gas, Inc. | Arlington, TX 76016 | Oil & Gas Operator | Mar 2014 |
| 503 | W M A Corporation | Wichita, KS 67278-1713 | Oil & Gas Operator | Jan 1998 |
| 504 | Wagner & Brown LP | Midland, TX 79702-1714 | Oil & Gas Operator | Aug 2022 |
| 505 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 506 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 507 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2026 |
| 508 | Walters Oil Company | Elmore City, OK 73433-9505 | Oil & Gas Operator | Mar 2026 |
| 509 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Apr 2026 |
| 510 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2026 |
| 511 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Apr 2026 |
| 512 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 513 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2026 |
| 514 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 515 | Windward Development LLC | Tulsa, OK 74136-7007 | Oil & Gas Operator | Jul 2019 |
| 516 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 517 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |
| 518 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Apr 2026 |
| 519 | Yingling Oil, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2000 |
| 520 | Young H Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 1993 |