| 601 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 602 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Feb 2026 |
| 603 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 604 | Texas Crude Exploration Inc | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 605 | Texas Energy Mutual LLC | Grapevine, TX 76051-8145 | Oil Operator | Jun 2018 |
| 606 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 607 | The KT Oil Company LLC | Ada, OK 74820 | Oil & Gas Operator | Mar 2026 |
| 608 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2026 |
| 609 | The William R Earnhardt Company | Bristow, OK 74010 | Oil & Gas Operator | Feb 2026 |
| 610 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 611 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2026 |
| 612 | Thomas Wayne Oil & Gas | Bristow, OK 74010-0544 | Oil & Gas Operator | Jan 2018 |
| 613 | Three MG Family Inc | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 614 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 615 | Tiger Oil Company | Dallas, TX 75221 | Oil & Gas Operator | May 2007 |
| 616 | Tolson Gary | Seminole, OK 74868-3267 | Oil & Gas Operator | Jan 2026 |
| 617 | Topsail Secondary Recovery LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 618 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 619 | Tower Wanda L Nations | Oklahoma City, OK 73123 | Oil & Gas Operator | Aug 1996 |
| 620 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Mar 2026 |
| 621 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Mar 2026 |
| 622 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 623 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Feb 2026 |
| 624 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 625 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 626 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 627 | TRP-Ok Properties LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 628 | Tru Operating LLC | Denton, TX 76201 | Oil & Gas Operator | Apr 2023 |
| 629 | True Performance Administrators LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 630 | Tulsa Energy Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2013 |
| 631 | Tulsa Minerals Inc | Tulsa, OK 74136-1045 | Oil & Gas Operator | May 2013 |
| 632 | Tuscany Operating LLC | Oklahoma City, OK 73106 | Oil & Gas Operator | Sep 2014 |
| 633 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 634 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 635 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Mar 2026 |
| 636 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Mar 2026 |
| 637 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Feb 2026 |
| 638 | United Primary Resources Inc | Milton, WA 98354-9361 | Oil & Gas Operator | Feb 2016 |
| 639 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jun 2026 |
| 640 | Valancy Operating LLC | Goldsby, OK 73093 | Oil & Gas Operator | Mar 2026 |
| 641 | Valley Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 642 | Van Horn Oil Company | Ada, OK 74820 | Oil & Gas Operator | Oct 1999 |
| 643 | Van Orsdol Paul | Bristow, OK 74010 | Oil & Gas Operator | Mar 2026 |
| 644 | Venis Exploration Company | Seminole, OK 74868 | Oil & Gas Operator | Oct 2024 |
| 645 | Veteran Exploration & Prod, LLC | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 646 | Viersen Drilling Company | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2022 |
| 647 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 648 | W F D Oil Corp. | Edmond, OK 73012 | Oil & Gas Operator | Feb 2026 |
| 649 | Waddell Norman | Seminole, OK 74868-1244 | Oil & Gas Operator | Nov 1998 |
| 650 | Waggoner Drilling Company | Bristow, OK 74010-0663 | Oil & Gas Operator | Jan 2014 |
| 651 | Walker David Wayne | Okemah, OK 74859-9731 | Oil & Gas Operator | Sep 2022 |
| 652 | Ware Jimmy M | Seminole, OK 74868 | Oil & Gas Operator | Nov 1998 |
| 653 | Warhorse Midcontinent Operating Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 654 | Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 655 | Watkins J L | Henryetta, OK 74437 | Oil & Gas Operator | Mar 2026 |
| 656 | Watkins Oil Company | Claremore, OK 74017 | Oil & Gas Operator | May 2018 |
| 657 | Western Natl Resource Expl LLC | Oklahoma City, OK 73154-0755 | Oil & Gas Operator | Mar 2015 |
| 658 | Western Natural Resources Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 659 | White Monty & Terry Production | Paden, OK 74860 | Oil & Gas Operator | May 2013 |
| 660 | White N J & White J B | Paden, OK 74860-0114 | Oil Operator | Aug 2013 |
| 661 | Whiteman Industries Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2025 |
| 662 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 663 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 664 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2026 |
| 665 | Williams Brothers Engineering Company | Tulsa, OK 74134-5885 | Oil & Gas Operator | May 2013 |
| 666 | Williams Doyle Dba BCF Gas | Tulsa, OK 74114-7099 | Oil & Gas Operator | Jul 2023 |
| 667 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 668 | Wilson Allen Dewayne | Okemah, OK 74859 | Oil & Gas Operator | Feb 2026 |
| 669 | Wimberley James A | Dallas, TX 75229-6180 | Oil & Gas Operator | Nov 2014 |
| 670 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 671 | Winston Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Feb 2026 |
| 672 | WN Operating Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 2026 |
| 673 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Mar 2026 |
| 674 | Xutapa Properties LLC | | Oil & Gas Operator | Mar 2026 |
| 675 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 2026 |
| 676 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 677 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 678 | Yeubanks Barbara | Cromwell, OK 74837 | Oil Operator | Mar 2026 |
| 679 | Young H Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 1993 |
| 680 | Young Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1999 |
| 681 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |