| 601 | Sydson D'Oro Expl. Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 602 | T And L Oil Inc | Tonkawa, OK 74653-4530 | Oil & Gas Operator | Jul 2025 |
| 603 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Jul 2025 |
| 604 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 605 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 606 | Tag Petroleum Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jan 2021 |
| 607 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 608 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jul 2025 |
| 609 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 610 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 611 | Taylor R Clark Exploration Inc | | Oil & Gas Operator | Aug 1992 |
| 612 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 613 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2025 |
| 614 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Aug 2025 |
| 615 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jun 2025 |
| 616 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 617 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 618 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 619 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jun 2025 |
| 620 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Oct 2025 |
| 621 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 622 | Toland & Johnston Inc | Edmond, OK 73034 | Oil & Gas Operator | Jun 2025 |
| 623 | Toomey Oil Company Inc | Tulsa, OK 74120 | Oil & Gas Operator | Jul 2025 |
| 624 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 625 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 626 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jun 2025 |
| 627 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 628 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Jul 2025 |
| 629 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Oct 2025 |
| 630 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 631 | Trivestco Energy Company | Ponca City, OK 74601 | Oil & Gas Operator | Jul 2025 |
| 632 | Truevine Operating LLC | Ada, OK 74821-1422 | Oil & Gas Operator | Jul 2025 |
| 633 | Tulum Corporation | Oklahoma City, OK 73101-0125 | Oil & Gas Operator | Feb 2025 |
| 634 | Turpin Ledon Production | Ada, OK 74820-0549 | Oil Operator | May 2025 |
| 635 | Twenty First Century Res Inc | Lajolla, CA 92037-7044 | Oil & Gas Operator | Mar 2015 |
| 636 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 637 | Two Forks Operating LLC | Ponca City, OK 74601-7815 | Oil & Gas Operator | Jun 2025 |
| 638 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 639 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 640 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 641 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Jul 2025 |
| 642 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 643 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Jul 2025 |
| 644 | Universal Fuels Company | | Oil & Gas Operator | Oct 1993 |
| 645 | Validus Inc | Fort Lauderdale, FL 33304 | Oil & Gas Operator | Jun 2025 |
| 646 | Vancol Oil Co Inc | Ponca City, OK 74602-0030 | Oil & Gas Operator | May 2018 |
| 647 | Vector Exploration Inc | Oklahoma City, OK 73142-4430 | Oil & Gas Operator | Dec 2018 |
| 648 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Jul 2025 |
| 649 | Victory Petroleum Inc | Tulsa, OK 74170-0354 | Oil & Gas Operator | May 2013 |
| 650 | Vintage Resources Inc | Lindsay, OK 73052-0285 | Oil Operator | Dec 2007 |
| 651 | Vista Energy Inc | Yukon, OK 73085-0827 | Oil & Gas Operator | Mar 2015 |
| 652 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 653 | W M Energy Corp | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2015 |
| 654 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 655 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 656 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Oct 2025 |
| 657 | Wedgewood Resources USA Inc | Vancouver, BC V6B1V-9000 | Oil & Gas Operator | Jul 2003 |
| 658 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 659 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Jun 2025 |
| 660 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 661 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Jun 2025 |
| 662 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Jul 2025 |
| 663 | WFD Oil Corporation | Edmond, OK 73012 | Oil & Gas Operator | Jun 2025 |
| 664 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Jul 2025 |
| 665 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 666 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Jun 2025 |
| 667 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 668 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 669 | Wil-Ron Inc | Lucien, OK 73757-9710 | Oil & Gas Operator | May 2025 |
| 670 | Wilco Oil & Gas Corporation | Oklahoma City, OK 73159-6229 | Oil & Gas Operator | Dec 2023 |
| 671 | Williams M H | Red Rock, OK 74651-0311 | Oil & Gas Operator | May 2023 |
| 672 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Jun 2025 |
| 673 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 674 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 675 | Wroten Wiley Jr | Dallas, TX 75252 | Oil & Gas Operator | Jun 1994 |
| 676 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Jul 2025 |
| 677 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 678 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 679 | Zim Energy Corporation | Tulsa, OK 74153 | Oil & Gas Operator | Jan 1998 |
| 680 | Zinke & Trumbo LTD | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2017 |
| 681 | Zuhone William H | Mattoon, IL 61938-4019 | Oil & Gas Operator | Jan 2015 |