| 801 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 802 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 803 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 804 | Tapoil Inc | Elmore City, OK 73433-9077 | Oil & Gas Operator | Jul 2021 |
| 805 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2026 |
| 806 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 807 | TD Operating Inc | Hinton, OK 73047 | Oil & Gas Operator | Jan 2026 |
| 808 | Te-Ray Energy Inc | Oklahoma City, OK 73108 | Oil & Gas Operator | Dec 2025 |
| 809 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2026 |
| 810 | Tee Cee'S Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 811 | Tema Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Jun 2009 |
| 812 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2025 |
| 813 | Teocalli Exploration LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jan 2026 |
| 814 | Tesoro Expl. & Prod. Company | San Antonio, TX 78216 | Gas Operator | Sep 2010 |
| 815 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Dec 2025 |
| 816 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 817 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Dec 2025 |
| 818 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 819 | Texaco Oils Inc | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 820 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 821 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 822 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 823 | Three Sands Investment Company | Waukomis, OK 73773 | Oil & Gas Operator | Dec 2025 |
| 824 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 825 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 826 | Tidemark Exploration | Tulsa, OK 74170 | Oil & Gas Operator | May 2005 |
| 827 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Mar 2026 |
| 828 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Nov 2025 |
| 829 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Jan 2026 |
| 830 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Dec 2025 |
| 831 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 832 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 833 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 834 | Tpet, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 835 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 836 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jan 2026 |
| 837 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Mar 2026 |
| 838 | Tresco Energy LLC | Enid, OK 73703-3002 | Oil & Gas Operator | Dec 2025 |
| 839 | Triplett Larry W | Oklahoma City, OK 73112-5325 | Oil & Gas Operator | Mar 2015 |
| 840 | Tripower Resources LLC | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2026 |
| 841 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 842 | Trivestco Energy Company | Ponca City, OK 74601 | Oil & Gas Operator | Jan 2026 |
| 843 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Jan 2026 |
| 844 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Dec 2025 |
| 845 | Tuthill S Keith & Bill Barbee | Amarillo, TX 79101-1427 | Oil & Gas Operator | Dec 2004 |
| 846 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2026 |
| 847 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 848 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 849 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 850 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 851 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 852 | Union Texas Petroleum Corp | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 853 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2026 |
| 854 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Dec 2025 |
| 855 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Mar 2026 |
| 856 | Valence Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2026 |
| 857 | Valiant Oil & Inv Co | | Oil & Gas Operator | Dec 2025 |
| 858 | Validus Energy II Midcon LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2026 |
| 859 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Dec 2025 |
| 860 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 861 | Vantage Point Operating Co. | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 862 | Veenker Resources Inc | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2026 |
| 863 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 864 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 865 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 866 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 867 | W S Crude Oil Purchasing Inc | Oklahoma City, OK 73129-7613 | Oil & Gas Operator | May 2008 |
| 868 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Jan 2026 |
| 869 | Wallace Energy Inc | Denver, CO 80202-4327 | Oil Operator | Jun 2015 |
| 870 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Mar 2026 |
| 871 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 872 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 873 | Warfield John E | Cleo Springs, OK 73729-9723 | Oil & Gas Operator | Jul 2005 |
| 874 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Mar 2026 |
| 875 | Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 876 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2024 |
| 877 | Washita Oil And Gas, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 878 | Watertech Disposal | Enid, OK 73702-0125 | Oil Operator | Sep 2007 |
| 879 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2026 |
| 880 | Weaver Energy Corporation | Hennessey, OK 73742-1232 | Oil & Gas Operator | Jan 2026 |
| 881 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Dec 2025 |
| 882 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Jan 2026 |
| 883 | Western Mountain Resources LLC | Cogan Station, PA 17728 | Oil & Gas Operator | Dec 2025 |
| 884 | Western Oil And Gas Development Corp | Oklahoma City, OK 73103-3735 | Oil & Gas Operator | Jan 2026 |
| 885 | Western Products Corporation | Fairview, OK 73737 | Oil & Gas Operator | Nov 2004 |
| 886 | Westside Wells Inc | Altus, OK 73521 | Oil & Gas Operator | Nov 2020 |
| 887 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2026 |
| 888 | Wheatland Oil Inc | Enid, OK 73702-1032 | Oil & Gas Operator | Mar 2015 |
| 889 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2025 |
| 890 | Wheeler Energy, LLC | Tulsa, OK 74101 | Oil & Gas Operator | Mar 2026 |
| 891 | Whitaker Energy Inc | Humble, TX 77346-1798 | Oil & Gas Operator | Jan 2026 |
| 892 | White Alton L Trust | Nowata, OK 74048 | Oil & Gas Operator | Aug 2013 |
| 893 | White Clarence A | Lawton, OK 73505-4927 | Oil & Gas Operator | Dec 2025 |
| 894 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | Jan 2026 |
| 895 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 896 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 897 | Whitley Oil & Gas Inc | Owasso, OK 74055 | Oil & Gas Operator | Jun 2009 |
| 898 | Whitmar Exploration Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 899 | Whitmar Operating Company | Tulsa, OK 74103-3515 | Oil & Gas Operator | Apr 2009 |
| 900 | Wildhorse Oil & Gas Corporation | Ardmore, OK 73402 | Oil & Gas Operator | May 2019 |