| 801 | Still A B Wel-Service Inc | Drumright, OK 74030-0787 | Oil & Gas Operator | Jul 2019 |
| 802 | Still Alex B Estate Of | Sagle, ID 83860-0644 | Oil & Gas Operator | Nov 2018 |
| 803 | Stillwater Oil & Gas | Irving, TX 75062 | Oil & Gas Operator | Mar 2015 |
| 804 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2026 |
| 805 | STP Cherokee Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2014 |
| 806 | Strike Energy Corp | Blackwell, OK 74631 | Oil & Gas Operator | Jul 2023 |
| 807 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 808 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2026 |
| 809 | Sullivant G W | Oklahoma City, OK 73172-1135 | Oil & Gas Operator | Aug 2001 |
| 810 | Sultex Oil & Gas Inc | Houston, TX 77059-3126 | Oil & Gas Operator | Aug 2002 |
| 811 | Sundance Energy Oklahoma LLC Dba Seo LLC | Denver, CO 80202-3620 | Oil & Gas Operator | Nov 2021 |
| 812 | Sunset Energy L L C | Palm Harbor, FL 34683-3044 | Oil Operator | Dec 2024 |
| 813 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 814 | Superior Midstream, LLC | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2020 |
| 815 | Superior Oil & Gas Company Of Oklahoma | Calumet, OK 73014-8528 | Oil & Gas Operator | Jan 2024 |
| 816 | Superior Production MGMT Inc | Calumet, OK 73014 | Oil & Gas Operator | Mar 2015 |
| 817 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Apr 2026 |
| 818 | Swinea Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 2015 |
| 819 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 820 | Sylvan Oil Operating Company | Tulsa, OK 74103-3516 | Oil & Gas Operator | Apr 2016 |
| 821 | T B K Energy Company | Brenham, TX 77833 | Oil & Gas Operator | Apr 2026 |
| 822 | T C Craighead & Company LLC | Ardmore, OK 73401 | Oil & Gas Operator | Aug 2019 |
| 823 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 824 | Tag Petroleum Inc | Stillwater, OK 74076 | Oil & Gas Operator | Jan 2021 |
| 825 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 826 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | May 2026 |
| 827 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 828 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 829 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Apr 2026 |
| 830 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2026 |
| 831 | Tekenergy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 832 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Jul 2026 |
| 833 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 834 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | May 2026 |
| 835 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 836 | Terraquest Corporation | Edmond, OK 73034 | Oil & Gas Operator | Jul 1997 |
| 837 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2026 |
| 838 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 839 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Mar 2026 |
| 840 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 841 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 842 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | May 2026 |
| 843 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 844 | Thompson, Joe L., Inc. | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 2005 |
| 845 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 846 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 847 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | May 2026 |
| 848 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 849 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Jul 2026 |
| 850 | Tipperary Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 851 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Mar 2026 |
| 852 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | May 2026 |
| 853 | Topsail Secondary Recovery LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 854 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 855 | Tornado Energy Corporation | Sugarland, TX 77479-7124 | Oil & Gas Operator | Nov 2014 |
| 856 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 857 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 858 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | May 2026 |
| 859 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 860 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 861 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Jul 2026 |
| 862 | Trepco Production Company Inc | Yukon, OK 73099 | Oil & Gas Operator | Apr 2026 |
| 863 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 864 | Tri-State Pipeline Service Inc | Ninnekah, OK 73067-0189 | Oil & Gas Operator | Mar 2011 |
| 865 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | May 2026 |
| 866 | Triple W Oil Inc | Chandler, OK 74834-0546 | Oil & Gas Operator | May 2013 |
| 867 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2026 |
| 868 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 869 | Tucson Oil & Gas Inc | | Oil & Gas Operator | Aug 1994 |
| 870 | Tulsa Energy Partners LLC | Tulsa, OK 74105 | Oil & Gas Operator | May 2026 |
| 871 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2026 |
| 872 | Twenty First Century Res Inc | Lajolla, CA 92037-7044 | Oil & Gas Operator | Mar 2015 |
| 873 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | May 2026 |
| 874 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 875 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Jul 2026 |
| 876 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 877 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 878 | Underwood Oil And Gas LLC | Chandler, OK 74834-1414 | Oil & Gas Operator | May 2026 |
| 879 | Union Texas Petroleum Corp | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 880 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | May 2026 |
| 881 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2026 |
| 882 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Apr 2026 |
| 883 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | May 2026 |
| 884 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 885 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 886 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 887 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2026 |
| 888 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 889 | Victory Petroleum Inc | Tulsa, OK 74170-0354 | Oil & Gas Operator | May 2013 |
| 890 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 891 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 892 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 893 | W F D Oil Corp. | Edmond, OK 73012 | Oil & Gas Operator | Apr 2026 |
| 894 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | May 2026 |
| 895 | Wagner & Brown | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 896 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 897 | Walker Keith F | Ardmore, OK 73401 | Oil & Gas Operator | Jan 2019 |
| 898 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2026 |
| 899 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Apr 2026 |
| 900 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Jul 2026 |