| 601 | Sutton Energy LLC | Ada, OK 74820 | Oil & Gas Operator | Mar 2026 |
| 602 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Feb 2026 |
| 603 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 604 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 605 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 606 | Tamworth Resources LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 607 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Mar 2026 |
| 608 | Tarrant Tracy Dba Trace Oil | Crescent, OK 73028 | Oil & Gas Operator | Feb 2021 |
| 609 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 610 | Tcina Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2023 |
| 611 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Feb 2026 |
| 612 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jun 2026 |
| 613 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Feb 2026 |
| 614 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 615 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 616 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2026 |
| 617 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 618 | Testco Production Company | Watonga, OK 73772-0589 | Oil & Gas Operator | Aug 2013 |
| 619 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Feb 2026 |
| 620 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 621 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2026 |
| 622 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 623 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 624 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 625 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Jun 2026 |
| 626 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Mar 2026 |
| 627 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Feb 2026 |
| 628 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 629 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 630 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 631 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Feb 2026 |
| 632 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Mar 2026 |
| 633 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Jun 2026 |
| 634 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Feb 2026 |
| 635 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 636 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 637 | Triumph Energy Partners LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Feb 2026 |
| 638 | Triumph Resources Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2004 |
| 639 | Troy Energy Operating LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2026 |
| 640 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Mar 2026 |
| 641 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 642 | Tuthill S Keith & Bill Barbee | Amarillo, TX 79101-1427 | Oil & Gas Operator | Dec 2004 |
| 643 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2026 |
| 644 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 645 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 646 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 647 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 648 | Unbridled Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 649 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 650 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jun 2026 |
| 651 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Jun 2026 |
| 652 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Feb 2026 |
| 653 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jun 2026 |
| 654 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Jun 2026 |
| 655 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 656 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Feb 2026 |
| 657 | Valpoint Operating, LLC | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2026 |
| 658 | Vanderbilt Resources Corp. | Midland, TX 79701 | Oil & Gas Operator | Nov 1991 |
| 659 | Vantage Point Operating Co. | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 660 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 661 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 662 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 663 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 664 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 665 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Mar 2026 |
| 666 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 667 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Jun 2026 |
| 668 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 669 | Washita Oil And Gas, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 670 | Washita Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2006 |
| 671 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 672 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 673 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Mar 2026 |
| 674 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Feb 2026 |
| 675 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Mar 2026 |
| 676 | Westshore Operating Inc | Naples, FL 34109-0549 | Oil & Gas Operator | Dec 2011 |
| 677 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2026 |
| 678 | Wheatland Oil Inc | Enid, OK 73702-1032 | Oil & Gas Operator | Mar 2015 |
| 679 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2026 |
| 680 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 681 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 682 | Wildwood Operating LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 683 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 684 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2026 |
| 685 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 686 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 687 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 688 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 689 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Mar 2026 |
| 690 | Yarhola Production Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 691 | Young Tommy Oil Inc | Woodward, OK 73802-0893 | Oil & Gas Operator | Feb 2026 |
| 692 | Z G Exploration Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2005 |
| 693 | Zeiders Bros. Oil & Gas Company, L.L.C. | Edmond, OK 73003 | Oil & Gas Operator | Feb 2026 |
| 694 | Zephyr Operating Co LLC | Oklahoma City, OK 73118-6035 | Oil & Gas Operator | Mar 2026 |
| 695 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 696 | ZP Disposal Systems LLC | Kingfisher, OK 73750 | Oil Operator | Mar 2026 |