| 801 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 802 | Sunergon Oil Operating, LLC | Gainesville, TX 76240 | Oil Operator | Mar 2025 |
| 803 | Sunray Energy, Inc. | Round Rock, TX 78683 | Oil & Gas Operator | Nov 2018 |
| 804 | Swab Oil Co. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 805 | T.G.B., Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 806 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 807 | Tabula Rasa Energy, LLC | Allen, TX 75013 | Oil & Gas Operator | Dec 2020 |
| 808 | Tacor Resources Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2025 |
| 809 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Mar 2025 |
| 810 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 811 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 812 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 813 | Taurus Exploration U.S.A., Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 1998 |
| 814 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 815 | TCF Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 816 | Teco Oil & Gas, Inc. | Tampa, FL 33601 | Oil & Gas Operator | Nov 1997 |
| 817 | Tejas Operators, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 818 | Tejas Trucking, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 819 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 820 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 821 | Tempo Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 822 | Teon Management, LLC | Midland, TX 79704 | Oil & Gas Operator | Mar 2020 |
| 823 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 824 | Tessara Petroleum Resources, LLC | Houston, TX 77086 | Oil & Gas Operator | Apr 2020 |
| 825 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Mar 2025 |
| 826 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 827 | Texas Consolidated Pet. Corp. | Fort Worth, TX 76109 | Oil & Gas Operator | Mar 2025 |
| 828 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 829 | Texas Hydrogen Energy Corp. | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 830 | Texas Trade International Inc. | Andrews, TX 79714 | Oil Operator | Mar 2025 |
| 831 | Texican Crude & Hydrocarbons LLC | Houston, TX 77002 | Oil Operator | Sep 2023 |
| 832 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 833 | Texland Petroleum, L.P. | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 834 | Texland/JMC Joint Venture | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2002 |
| 835 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 836 | Three Rivers Operating Co II LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 837 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 838 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 839 | Three-B Oil Company, The | Monahans, TX 79756 | Oil & Gas Operator | Mar 2025 |
| 840 | Thresher Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Mar 2025 |
| 841 | Throne Petroleum Resources LLC | Houston, TX 77006 | Oil & Gas Operator | Aug 2021 |
| 842 | Tipperary Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | May 2014 |
| 843 | Titan Resources I, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2000 |
| 844 | Tom Operating And Minerals LLC | Andrews, TX 79714 | Gas Operator | Mar 2025 |
| 845 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 846 | TPC Exploration, LLC | May, TX 76857 | Oil & Gas Operator | Mar 2025 |
| 847 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Mar 2025 |
| 848 | Trey Resources Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 849 | Triag Energy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2014 |
| 850 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Mar 2025 |
| 851 | Triple "N" Services, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 852 | Tripod Oil And Gas 3 LLC | Tulsa, OK 74152 | Oil Operator | Mar 2025 |
| 853 | Triumph Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 854 | TSF Operating | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 855 | Two Oaks Operating Company, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2008 |
| 856 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 857 | U S Energy Corp. Of Amer. Inc. | Ranger, TX 76470 | Oil & Gas Operator | Mar 2025 |
| 858 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Mar 2025 |
| 859 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 860 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 861 | Union Seaboard Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 862 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 863 | United Energy Trading LLC | Tulsa, OK 74133 | Gas Operator | Feb 2015 |
| 864 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 865 | Unitex Oil & Gas, L.L.C. | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 866 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 867 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 868 | V-F Petroleum Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 869 | Valero Marketing & Supply Co | San Antonio, TX 78269-6000 | Oil & Gas Operator | Sep 2023 |
| 870 | Valla Energy Corporation | Odessa, TX 79762 | Oil & Gas Operator | Aug 2003 |
| 871 | Valley Gathering Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1997 |
| 872 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2025 |
| 873 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 874 | Vanguard Permian LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2018 |
| 875 | Vaquero Hunter Inc. | Andrews, TX 79714 | Oil & Gas Operator | Sep 2023 |
| 876 | Vaquero Permian, LLC | Andrews, TX 79714 | Oil & Gas Operator | Mar 2024 |
| 877 | Verdad Oil & Gas Corporation | Dallas, TX 75235 | Oil & Gas Operator | Mar 2025 |
| 878 | Viejo Services, LLC | Boyd, TX 76023 | Oil & Gas Operator | Mar 2025 |
| 879 | Vin Fisher Oil Company | Andrews, TX 79714 | Oil & Gas Operator | May 2008 |
| 880 | Vin Fisher Operating, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2025 |
| 881 | Viola Prod., Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2025 |
| 882 | Vision Natural Resources, LP | Midland, TX 79708 | Oil & Gas Operator | Mar 2025 |
| 883 | Vista Resources, Inc. (A) | Midland, TX 79701 | Oil & Gas Operator | Feb 2000 |
| 884 | Vitol Inc | Houston, TX 77002 | Oil & Gas Operator | Sep 2023 |
| 885 | Vogel, A. J., Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 1994 |
| 886 | W & T Offshore, Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 887 | W.A. Oil Co. | Andrews, TX 79714 | Oil & Gas Operator | Aug 1997 |
| 888 | Wagner & Brown, LTD. | Midland, TX 79702 | Oil & Gas Operator | Aug 2014 |
| 889 | Wagner Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 890 | Walkabout Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Mar 2025 |
| 891 | Wallen Production Co. | Midland, TX 79702 | Oil & Gas Operator | Aug 1996 |
| 892 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Mar 2025 |
| 893 | Walsh Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2022 |
| 894 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 895 | Walter Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 896 | Warrior Exploration LLC | Sapulpa, OK 74067-1912 | Oil & Gas Operator | Dec 2024 |
| 897 | Watusi Energy LLC | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 898 | Westar Energy, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 899 | Western Reserves Oil Co Inc | Midland, TX 79705 | Oil & Gas Operator | Oct 2020 |
| 900 | Westland Oil Development Corp. | Conroe, TX 77305 | Oil & Gas Operator | Mar 2008 |