| 401 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 402 | Tracy & Associates Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 403 | Triangle Interprises Inc | Justin, TX 76247-0598 | Oil & Gas Operator | Jun 2015 |
| 404 | Trinity Oil & Gas Producers LLC | Allen, OK 74825 | Oil & Gas Operator | Jan 2025 |
| 405 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 406 | True Performance Administrators LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jan 2025 |
| 407 | Truevine Operating LLC | Ada, OK 74821-1422 | Oil & Gas Operator | Jan 2025 |
| 408 | Turpin Ledon Production | Ada, OK 74820-0549 | Oil Operator | Jan 2025 |
| 409 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 410 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Jan 2025 |
| 411 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2025 |
| 412 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Feb 2025 |
| 413 | United States Trading & Trans | Dallas, TX 75380-3342 | Oil & Gas Operator | Dec 1994 |
| 414 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 415 | Van Horn Oil Company | Ada, OK 74820 | Oil & Gas Operator | Oct 1999 |
| 416 | Vaughan III Ben F | Austin, TX 78768-2233 | Oil & Gas Operator | Dec 2024 |
| 417 | Victory Petroleum Inc | Tulsa, OK 74170-0354 | Oil & Gas Operator | May 2013 |
| 418 | Vitol Inc | Houston, TX 77002 | Oil & Gas Operator | Sep 2023 |
| 419 | Walden E F | Ada, OK 74820 | Oil & Gas Operator | Aug 2014 |
| 420 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 421 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 422 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jan 2025 |
| 423 | Watkins J L | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 424 | Weatherly Nell M Estate | Ada, OK 74821-0669 | Oil & Gas Operator | Feb 1997 |
| 425 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 426 | Wells Jimme D | Ponca City, OK 74604 | Oil Operator | Jan 2025 |
| 427 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 428 | White Oak Production Company | Conway, AR 72034 | Oil & Gas Operator | Sep 2005 |
| 429 | Whittington Curtis | Stonewall, OK 74871-0482 | Oil & Gas Operator | Feb 2011 |
| 430 | Wildcat Cement Co. | Shamrock, TX 79079 | Oil & Gas Operator | May 2015 |
| 431 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 432 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | May 2025 |
| 433 | Worldwide Energy Corp. | Freer, TX 78357 | Oil & Gas Operator | Jan 1997 |
| 434 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 435 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2025 |
| 436 | Younger Enterprises Inc | Ada, OK 74821-1882 | Oil Operator | Jan 2003 |
| 437 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |