| 601 | Silver Creek Oil & Gas, LLC | Flower Mound, TX 75022 | Oil & Gas Operator | Apr 2025 |
| 602 | Silver Pines Energy Corp. | Houston, TX 77005 | Oil & Gas Operator | Jan 2025 |
| 603 | Singer Oil Co LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 604 | Singer Oil Company | Oklahoma City, OK 73148 | Oil & Gas Operator | Jan 2025 |
| 605 | Skycap Energy, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 606 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 607 | Sloan Petroleum Service Inc | Guthrie, OK 73044 | Oil & Gas Operator | Feb 2025 |
| 608 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2025 |
| 609 | Smith Conley P Operating Co | Eglewood, CO 80112-3640 | Oil & Gas Operator | Jun 2000 |
| 610 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 611 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 612 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Feb 2025 |
| 613 | Sooner Oil & Gas | Fairview, OK 73737-1806 | Oil & Gas Operator | Jan 2025 |
| 614 | Sooner Trend Exploration Inc | Kingfisher, OK 73750-4752 | Oil & Gas Operator | Dec 2015 |
| 615 | Southerland Marquieta Dba Keta Oil Company | Loco, OK 73442-1815 | Oil & Gas Operator | Feb 2025 |
| 616 | Southern Resources Inc | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2025 |
| 617 | Southwest Energy LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2025 |
| 618 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 619 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2025 |
| 620 | St Joe Petroleum U S Corp | | Oil & Gas Operator | Aug 2000 |
| 621 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 622 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 623 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2025 |
| 624 | Staghorn Petroleum II LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Feb 2025 |
| 625 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jan 2025 |
| 626 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 627 | Stalwart Energy Co | Tulsa, OK 74103-3518 | Oil & Gas Operator | Apr 2014 |
| 628 | Star Resources LLC | Englewood, CO 80155-5185 | Oil & Gas Operator | Dec 2013 |
| 629 | Statoil Oil & Gas LP | Austin, TX 78730 | Oil & Gas Operator | Oct 2018 |
| 630 | Stephen Michael Inc | Midwest City, OK 73130-5200 | Oil & Gas Operator | Oct 2015 |
| 631 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2025 |
| 632 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 633 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2025 |
| 634 | Struck Rock Oil And Gas LLC | Geary, OK 73040 | Oil & Gas Operator | Jan 2025 |
| 635 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 636 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2025 |
| 637 | Summit Resources Management LLC | Edmond, OK 73083 | Oil & Gas Operator | Jan 2025 |
| 638 | Sun Refining & Marketing | Philadelphia, PA 19103 | Oil & Gas Operator | Jul 2015 |
| 639 | Sunoco Partners MKT & Terminal | Tulsa, OK 74102-2039 | Oil & Gas Operator | Jan 2019 |
| 640 | Superior Oil & Gas Company Of Oklahoma | Calumet, OK 73014-8528 | Oil & Gas Operator | Jan 2024 |
| 641 | Sutton Energy LLC | Ada, OK 74820-8550 | Oil & Gas Operator | Jan 2025 |
| 642 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jan 2025 |
| 643 | Swift Energy Company | Houston, TX 77060 | Oil & Gas Operator | Mar 2021 |
| 644 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 645 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 646 | Tamworth Resources LLC | Broken Arrow, OK 74012 | Oil & Gas Operator | Jan 2025 |
| 647 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2025 |
| 648 | Tarrant Tracy Dba Trace Oil | Crescent, OK 73028 | Oil & Gas Operator | Feb 2021 |
| 649 | Tbi Exploration Inc | Englewood, CO 801556525 | Oil & Gas Operator | Jun 2011 |
| 650 | Tcina Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2023 |
| 651 | Te-Ray Energy, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Jan 2025 |
| 652 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 653 | Technical Energy Services, Inc. | Norman, OK 73070 | Oil & Gas Operator | Jan 2025 |
| 654 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 655 | Tenaska Marketing Ventures | Omaha, NE 68154 | Oil & Gas Operator | Mar 2021 |
| 656 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2024 |
| 657 | Teocalli Exploration LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 658 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2025 |
| 659 | Testco Production Company | Watonga, OK 73772-0589 | Oil & Gas Operator | Aug 2013 |
| 660 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Dec 2024 |
| 661 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 662 | Texas Southwest Gas LLC | Tulsa, OK 74121 | Oil & Gas Operator | Oct 2022 |
| 663 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 664 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 665 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 666 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 667 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2025 |
| 668 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Feb 2025 |
| 669 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Jan 2025 |
| 670 | Toklan Oil Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 671 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 672 | Total Petroleum Inc | Denver, CO 80201-0500 | Oil & Gas Operator | Nov 2006 |
| 673 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 674 | Trace Oil & Gas LP | Cement, OK 73017 | Oil & Gas Operator | Jan 2025 |
| 675 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2025 |
| 676 | Trans-Texas Investments Inc | | Oil & Gas Operator | Aug 1995 |
| 677 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Apr 2025 |
| 678 | Trepco Production Company, Inc. | Yukon, OK 73099 | Oil & Gas Operator | Jan 2025 |
| 679 | Trigg Drilling Company Inc | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2013 |
| 680 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 681 | Triumph Energy Partners LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Jan 2025 |
| 682 | Triumph Resources Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2004 |
| 683 | Troy Energy Operating LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 684 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Feb 2025 |
| 685 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 686 | Tuthill S Keith & Bill Barbee | Amarillo, TX 79101-1427 | Oil & Gas Operator | Dec 2004 |
| 687 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 688 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 689 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 690 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 691 | Unbridled Resources, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 692 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 693 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 694 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2025 |
| 695 | United Energy Trading LLC | Tulsa, OK 74133 | Oil & Gas Operator | Jan 2025 |
| 696 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Jan 2025 |
| 697 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Apr 2025 |
| 698 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 699 | Valjohn Energy Corporation | Oklahoma City, OK 73142-6090 | Oil & Gas Operator | Jan 2025 |
| 700 | Valpoint Operating, LLC | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |