| 801 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | May 2025 |
| 802 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 803 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | May 2025 |
| 804 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 805 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 806 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 807 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 808 | The Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 809 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 810 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 811 | Three Sands Investment Company | Waukomis, OK 73773 | Oil & Gas Operator | Apr 2025 |
| 812 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 813 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 814 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 815 | Tidewater Operating Co Inc | Tulsa, OK 74136-6308 | Oil & Gas Operator | May 2025 |
| 816 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Jul 2025 |
| 817 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Apr 2025 |
| 818 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | May 2025 |
| 819 | TLM Resources Inc | Enid, OK 73706-0641 | Gas Operator | Mar 2015 |
| 820 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | May 2025 |
| 821 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 822 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 823 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 824 | Tower Oil & Gas Company, Inc. | Englewood, CO 80111 | Oil & Gas Operator | May 2001 |
| 825 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 826 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | May 2025 |
| 827 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 828 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 829 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | May 2025 |
| 830 | Triple W Oil Inc | Chandler, OK 74834-0546 | Oil & Gas Operator | May 2013 |
| 831 | Triplett Larry W | Oklahoma City, OK 73112-5325 | Oil & Gas Operator | Mar 2015 |
| 832 | Tritex Production Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jan 2013 |
| 833 | Trivestco Energy Company | Ponca City, OK 74601 | Oil & Gas Operator | May 2025 |
| 834 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | May 2025 |
| 835 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Apr 2025 |
| 836 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 837 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 838 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Apr 2025 |
| 839 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 840 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Jul 2025 |
| 841 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 842 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 843 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 844 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | May 2025 |
| 845 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Apr 2025 |
| 846 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Apr 2025 |
| 847 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | May 2025 |
| 848 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 849 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Jul 2025 |
| 850 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 851 | Valjohn Energy Corporation | Dover, OK 73734 | Oil & Gas Operator | Apr 2025 |
| 852 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 853 | Vantage Point Operating Co | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 854 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Mar 2025 |
| 855 | Vector Exploration Inc | Oklahoma City, OK 73142-4430 | Oil & Gas Operator | Dec 2018 |
| 856 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2025 |
| 857 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 858 | Veritas Energy LLC | San Antonio, TX 78231 | Oil & Gas Operator | Jul 2025 |
| 859 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 860 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 861 | Vista Energy Inc | Yukon, OK 73085-0827 | Oil & Gas Operator | Mar 2015 |
| 862 | Vitol Inc. | Houston, TX 77098 | Oil & Gas Operator | Sep 2023 |
| 863 | VRC Oil & Gas Operating Co | Oklahoma City, OK 73116-1431 | Oil & Gas Operator | Jun 2019 |
| 864 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | May 2025 |
| 865 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 866 | Walker Corporation (The) | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 867 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 868 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 869 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 870 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Jul 2025 |
| 871 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2024 |
| 872 | Weaver Energy Corporation | Hennessey, OK 73742-1232 | Oil & Gas Operator | May 2025 |
| 873 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 874 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 875 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Apr 2025 |
| 876 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | May 2025 |
| 877 | Western Division Investments Inc | Enid, OK 73701 | Oil & Gas Operator | Jul 2021 |
| 878 | Western Tank Trucks Inc | Hennessey, OK 73742 | Oil Operator | Jul 2011 |
| 879 | Weststar Oil & Gas Inc | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 880 | Wheeler Energy Co. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 881 | Wheeler Richard Jr | Oklahoma City, OK 73112-8857 | Oil & Gas Operator | Mar 2005 |
| 882 | White Goat Resources LLC | Yukon, OK 73099 | Oil & Gas Operator | May 2025 |
| 883 | White Rock Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Jul 2025 |
| 884 | White Star Petroleum LLC | Oklahoma City, OK 73116-7906 | Oil & Gas Operator | Feb 2025 |
| 885 | Whitehead Ross E | Lamont, OK 74643-0326 | Oil & Gas Operator | Nov 2014 |
| 886 | Whiting Oil And Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 887 | Wicklund Petroleum Corporation | Naples, FL 34108-0108 | Oil & Gas Operator | Dec 2019 |
| 888 | Wilco Oil & Gas Corporation | Oklahoma City, OK 73159-6229 | Oil & Gas Operator | Dec 2023 |
| 889 | Wildhorse Operating Company | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2025 |
| 890 | Wildwood Operating LLC | Hennessey, OK 73742-7711 | Oil & Gas Operator | Apr 2025 |
| 891 | Williams Roger F | Tulsa, OK 74152-0951 | Oil & Gas Operator | May 2013 |
| 892 | Winston Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Mar 2025 |
| 893 | Winzeler Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2013 |
| 894 | Withrow Oil Company Inc | Yukon, OK 73099-7712 | Oil & Gas Operator | Apr 2021 |
| 895 | Witty Thomas E | Enid, OK 73703 | Oil & Gas Operator | Mar 2008 |
| 896 | WLW Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | May 2025 |
| 897 | Wood Fay C Estate | Enid, OK 73703 | Oil & Gas Operator | Jun 2013 |
| 898 | WR Oil & Gas LLC | Plano, TX 75024-3523 | Oil & Gas Operator | May 2025 |
| 899 | Wright Jerry L | Crescent, OK 73028-0474 | Oil & Gas Operator | Jun 2013 |
| 900 | Xanadu Exploration Company | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2025 |