| 801 | Sydson D'Oro Expl. Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 1992 |
| 802 | T B K Energy Company | New Braunfels, TX 78130 | Oil & Gas Operator | Sep 2024 |
| 803 | T.C. Harris Pumping LLC | Hennessey, OK 73742 | Gas Operator | Aug 2024 |
| 804 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 805 | Tack Operating LLC | Oklahoma City, OK 73172-1492 | Oil & Gas Operator | Aug 2021 |
| 806 | Tapstone Energy LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2024 |
| 807 | Tarka Energy LLC | Houston, TX 77056-1940 | Oil & Gas Operator | Mar 2022 |
| 808 | Tat, Inc. | Oklahoma City, OK 73127 | Oil & Gas Operator | Feb 2023 |
| 809 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 810 | Taylor John A | | Oil & Gas Operator | Jan 2016 |
| 811 | Taylor R C Companies Inc | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2021 |
| 812 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 813 | Tcina Inc | Seminole, OK 74868 | Oil & Gas Operator | May 2023 |
| 814 | Te-Ray Resources, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2024 |
| 815 | Teepee Oil & Gas Inc | Yukon, OK 73085 | Oil Operator | Dec 2006 |
| 816 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Nov 2024 |
| 817 | Templar Operating LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2024 |
| 818 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Aug 2024 |
| 819 | Teocalli Exploration LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Sep 2024 |
| 820 | Territory Resources LLC | Stillwater, OK 74074-1869 | Oil & Gas Operator | Oct 2024 |
| 821 | Terry John Trust | Aurora, CO 80012-5112 | Oil & Gas Operator | May 2016 |
| 822 | Terry Production Co | Stroud, OK 74079-0475 | Oil & Gas Operator | Aug 2008 |
| 823 | Tessera Energy LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2024 |
| 824 | Tex-Star Production | Dallas, TX 75206 | Oil & Gas Operator | Sep 2024 |
| 825 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 826 | Texaco Expl. And Prod. Inc. | Houston, TX 77236 | Oil & Gas Operator | Jul 2024 |
| 827 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 828 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 829 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 830 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 831 | The Warren Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2016 |
| 832 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 833 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 834 | Three Sands Investment Company | Waukomis, OK 73773 | Oil & Gas Operator | Aug 2024 |
| 835 | Three Sands Oil Inc | Perry, OK 73077 | Oil & Gas Operator | May 2023 |
| 836 | Tide West Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2021 |
| 837 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 838 | Tidewater Operating Co Inc | Tulsa, OK 74136-6308 | Oil & Gas Operator | Sep 2024 |
| 839 | Tilley Oil & Gas, Inc. | Oklahoma City, OK 73172 | Oil & Gas Operator | Nov 2024 |
| 840 | Titan Oil & Gas Corporation | Edmond, OK 73013-5417 | Oil & Gas Operator | Sep 2024 |
| 841 | Titan Resources LTD | Limaville, OH 44640 | Oil & Gas Operator | Sep 2024 |
| 842 | TLS Oil & Gas Inc | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Sep 2024 |
| 843 | Toklan Oil And Gas Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2024 |
| 844 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 845 | Total Petroleum Inc | Denver, CO 80201-0500 | Oil & Gas Operator | Nov 2006 |
| 846 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 847 | Tower Oil & Gas Company, Inc. | Englewood, CO 80111 | Oil & Gas Operator | May 2001 |
| 848 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 849 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | Sep 2024 |
| 850 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 851 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 852 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Sep 2024 |
| 853 | Triple W Oil Inc | Chandler, OK 74834-0546 | Oil & Gas Operator | May 2013 |
| 854 | Triplett Larry W | Oklahoma City, OK 73112-5325 | Oil & Gas Operator | Mar 2015 |
| 855 | Tritex Production Co. | Iowa Park, TX 76367 | Oil & Gas Operator | Jan 2013 |
| 856 | Trivestco Energy Company | Ponca City, OK 74601 | Oil & Gas Operator | Sep 2024 |
| 857 | Tulsa Energy Partners LLC | Tulsa, OK 74103-4461 | Oil & Gas Operator | Sep 2024 |
| 858 | Turner Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Aug 2024 |
| 859 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Sep 2024 |
| 860 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 861 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Sep 2024 |
| 862 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 863 | U.S. Energy Development Corp | Arlington, TX 76011 | Oil & Gas Operator | Nov 2024 |
| 864 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 865 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 866 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 867 | Union Texas Products Corp | Houston, TX 77252 | Oil & Gas Operator | Nov 1994 |
| 868 | Union Valley Petroleum Corporation | Enid, OK 73701 | Oil & Gas Operator | Sep 2024 |
| 869 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Aug 2024 |
| 870 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Aug 2024 |
| 871 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Sep 2024 |
| 872 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 873 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Nov 2024 |
| 874 | Usedc Okc LLC | Getzville, NY 14068-1296 | Oil & Gas Operator | May 2018 |
| 875 | Valjohn Energy Corporation | Oklahoma City, OK 73142-6090 | Oil & Gas Operator | Aug 2024 |
| 876 | Van Horn Oil & Gas Inc | Tulsa, OK 74170 | Oil & Gas Operator | Nov 1998 |
| 877 | Vantage Point Operating Co | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 878 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Jul 2024 |
| 879 | Vector Exploration Inc | Oklahoma City, OK 73142-4430 | Oil & Gas Operator | Dec 2018 |
| 880 | Veenker Resources, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Sep 2024 |
| 881 | Vega Energy Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2015 |
| 882 | Veritas Energy LLC | San Antonio, TX 78231 | Oil & Gas Operator | Nov 2024 |
| 883 | Viersen & Cochran Drilling Company | | Oil & Gas Operator | May 2015 |
| 884 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Aug 2024 |
| 885 | Vista Energy Inc | Yukon, OK 73085-0827 | Oil & Gas Operator | Mar 2015 |
| 886 | Vitol Inc | Houston, TX 77002 | Oil & Gas Operator | Sep 2023 |
| 887 | VRC Oil & Gas Operating Co | Oklahoma City, OK 73116-1431 | Oil & Gas Operator | Jun 2019 |
| 888 | Waggoner Oil & Gas Corp | Enid, OK 73703-1152 | Oil & Gas Operator | Sep 2024 |
| 889 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 890 | Walker Corporation (The) | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 891 | Wallace Oil & Gas Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2024 |
| 892 | Ward Oil Company An Okla Corp | McAlester, OK 74501 | Oil & Gas Operator | Feb 1993 |
| 893 | Ward Petroleum Corporation | Enid, OK 73702 | Oil & Gas Operator | Sep 2024 |
| 894 | Warren American Oil Company LLC | Tulsa, OK 74147 | Oil & Gas Operator | Nov 2024 |
| 895 | Warren Drilling Co | Dexter City, OH 45727 | Oil & Gas Operator | Dec 2023 |
| 896 | Weaver Energy Corporation | Hennessey, OK 73742-1232 | Oil & Gas Operator | Sep 2024 |
| 897 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2024 |
| 898 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 899 | Wellco Energy Inc | Harrah, OK 73045 | Oil & Gas Operator | Sep 2024 |
| 900 | Wentworth Operating Company | Oklahoma City, OK 73162-1863 | Oil & Gas Operator | Sep 2024 |