| 601 | Star Oil Company | Wichita, KS 67230 | Oil & Gas Operator | Mar 2025 |
| 602 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2025 |
| 603 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 604 | Sting Exploration Company | Tulsa, OK 74120 | Oil Operator | Sep 2004 |
| 605 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 606 | Streamline Oil And Gas Inc | Lindsay, OK 73052 | Oil & Gas Operator | Nov 2025 |
| 607 | Stricker Resources Inc | Morris, OK 74445 | Oil & Gas Operator | Oct 2025 |
| 608 | Stride Energy LLC | Piedmont, OK 73078 | Oil & Gas Operator | Nov 2025 |
| 609 | Struck Rock Oil And Gas LLC | Geary, OK 73040 | Oil & Gas Operator | Oct 2025 |
| 610 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |
| 611 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 612 | Superior Oil & Gas LLC | Ringwood, OK 73768-9658 | Oil & Gas Operator | Nov 2025 |
| 613 | Swan Oil Co | Kellyville, OK 74039-5607 | Oil & Gas Operator | Dec 2023 |
| 614 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Oct 2025 |
| 615 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 616 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 617 | T & D Oil | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 618 | T-D Oil Inc | Cement, OK 73017-0065 | Oil & Gas Operator | May 2020 |
| 619 | T-K Exploration Company | Oklahoma City, OK 73102-7029 | Oil & Gas Operator | Mar 2015 |
| 620 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 621 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 622 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2025 |
| 623 | Tarrant Tracy Dba Trace Oil | Crescent, OK 73028 | Oil & Gas Operator | Feb 2021 |
| 624 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 625 | TD Operating Inc | Hinton, OK 73047 | Oil & Gas Operator | Nov 2025 |
| 626 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Oct 2025 |
| 627 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 628 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Oct 2025 |
| 629 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 630 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Oct 2025 |
| 631 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Nov 2025 |
| 632 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Nov 2025 |
| 633 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 634 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Sep 2025 |
| 635 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 636 | Texas Mineral Group | Midland, TX 79705 | Oil & Gas Operator | Aug 2013 |
| 637 | Texinia Oil & Gas Inc | Dallas, TX 75214 | Oil & Gas Operator | Nov 2025 |
| 638 | Three-N-One | | Oil Operator | Oct 2020 |
| 639 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 640 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 641 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 642 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 643 | Tower Wanda L Nations | Oklahoma City, OK 73123 | Oil & Gas Operator | Aug 1996 |
| 644 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Oct 2025 |
| 645 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 646 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Oct 2025 |
| 647 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Nov 2025 |
| 648 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 649 | Trilogy Natural Resources LLC | Edmond, OK 73025 | Oil Operator | Oct 2025 |
| 650 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 651 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 652 | Troy Energy Operating LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 653 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 654 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 655 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Oct 2025 |
| 656 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 657 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 658 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 659 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 660 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Sep 2025 |
| 661 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2025 |
| 662 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2025 |
| 663 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 664 | Vanguard Permian, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 665 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 666 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 667 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 668 | W M Energy Corp | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2015 |
| 669 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 670 | Wagner & Brown LP | Midland, TX 79702-1714 | Oil & Gas Operator | Aug 2022 |
| 671 | Walsh Jr F Howard | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Sep 2025 |
| 672 | Walsh Jr F Howard Opr Co Inc | Fort Worth, TX 76102-4773 | Oil & Gas Operator | Feb 2016 |
| 673 | Wapco, Inc. | Cement, OK 73017 | Oil Operator | Oct 2025 |
| 674 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 675 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Dec 2025 |
| 676 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 677 | Western Farmers Electric Coop | Anadarko, OK 73005-0429 | Oil & Gas Operator | Apr 2012 |
| 678 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Oct 2025 |
| 679 | Western Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2014 |
| 680 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 681 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Nov 2025 |
| 682 | White Oil Company | Cement, OK 73017-0515 | Oil Operator | Jun 2002 |
| 683 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Jul 2025 |
| 684 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 685 | Wil-MC Oil Corporation The | Irving, TX 75015-2510 | Oil & Gas Operator | Mar 1999 |
| 686 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |
| 687 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Dec 2025 |
| 688 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 689 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2025 |
| 690 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Dec 2025 |
| 691 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Dec 2025 |
| 692 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 693 | Winston Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Oct 2025 |
| 694 | WM Energy LLC | Asher, OK 74826 | Oil & Gas Operator | Oct 2025 |
| 695 | Wolverine Exploration Company | Houston, TX 77002 | Oil & Gas Operator | May 2019 |
| 696 | Woods Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 697 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | Oct 2025 |
| 698 | Wynn-Crosby Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 699 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | Nov 2025 |
| 700 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Nov 2025 |