| 501 | Turntable Energy Inc | Ponca City, OK 74604 | Oil & Gas Operator | Jan 2025 |
| 502 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 503 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Feb 2025 |
| 504 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2025 |
| 505 | United States Trading & Trans | Dallas, TX 75380-3342 | Oil & Gas Operator | Dec 1994 |
| 506 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 507 | Vancol Oil Co Inc | Ponca City, OK 74602-0030 | Oil & Gas Operator | May 2018 |
| 508 | Vector Exploration Inc | Oklahoma City, OK 73142-4430 | Oil & Gas Operator | Dec 2018 |
| 509 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 510 | Vitruvian Exploration LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2016 |
| 511 | Warcloud Resources LLC | Tulsa, OK 74137-6020 | Oil & Gas Operator | Mar 2021 |
| 512 | Watson Petroleum Inc | Wichita, KS 67208 | Oil & Gas Operator | May 2010 |
| 513 | Wedgewood Resources USA Inc | Vancouver, BC V6B1V-9000 | Oil & Gas Operator | Jul 2003 |
| 514 | Western Division Investments Inc | Enid, OK 73701 | Oil & Gas Operator | Jul 2021 |
| 515 | Western Gas Resources Inc | Denver, CO 80202-1955 | Oil & Gas Operator | Dec 2007 |
| 516 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Jan 2025 |
| 517 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Feb 2025 |
| 518 | Whitecap Energy L.L.C. | | Oil & Gas Operator | Sep 2018 |
| 519 | Whitehead Ross E | Lamont, OK 74643-0326 | Oil & Gas Operator | Nov 2014 |
| 520 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 521 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 522 | Wilco Oil & Gas Corporation | Oklahoma City, OK 73159-6229 | Oil & Gas Operator | Dec 2023 |
| 523 | Willa Mae Overman LLC | Ponca City, OK 74601-9451 | Oil & Gas Operator | Aug 2023 |
| 524 | Williams Doyle Dba BCF Gas | Tulsa, OK 74114-7099 | Oil & Gas Operator | Jul 2023 |
| 525 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | May 2023 |
| 526 | Winney Construction Company | Forks, WA 98331-0801 | Oil & Gas Operator | Jan 2013 |
| 527 | Withrow Oil Company Inc | Yukon, OK 73099-7712 | Oil & Gas Operator | Apr 2021 |
| 528 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Feb 2025 |
| 529 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 530 | Young Stanton L | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2014 |
| 531 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 532 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |