| 801 | Taylor, G. E. Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2007 |
| 802 | Taylor, J. S. Inc. | Lewisville, TX 75057 | Oil & Gas Operator | Sep 2026 |
| 803 | TC Energy LLC | Covington, OK 73730-2116 | Oil & Gas Operator | Sep 2014 |
| 804 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Sep 2026 |
| 805 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 806 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 807 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2026 |
| 808 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 809 | Tep Barnett USA, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2026 |
| 810 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Sep 2026 |
| 811 | Texas Tea Oil Company | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2011 |
| 812 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 813 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 814 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 815 | Textron Southwest Inc. | Henderson, TX 75654 | Oil & Gas Operator | Sep 2026 |
| 816 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Sep 2026 |
| 817 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 818 | Three J Operating Company, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2026 |
| 819 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Sep 2026 |
| 820 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 821 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 822 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Sep 2026 |
| 823 | TLH Production LLC | Abilene, TX 79602 | Oil & Gas Operator | Sep 2026 |
| 824 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Jul 2026 |
| 825 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2026 |
| 826 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 827 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 828 | Tracker Mineral | Clyde, TX 79510 | Oil & Gas Operator | Sep 2026 |
| 829 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 830 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 831 | Tresami, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2026 |
| 832 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 833 | Trio Operating Company, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2006 |
| 834 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | Sep 2026 |
| 835 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 836 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 837 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Sep 2026 |
| 838 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Sep 2026 |
| 839 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Sep 2026 |
| 840 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 841 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 842 | Upham Oil & Gas Company | Mineral Wells, TX 76068 | Oil & Gas Operator | Sep 2026 |
| 843 | Upham, Chester R., Jr. | Mineral Wells, TX 76067 | Oil & Gas Operator | Aug 2001 |
| 844 | Upstream Properties, LLC | Southlake, TX 76092 | Oil & Gas Operator | Sep 2026 |
| 845 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 846 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 847 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Sep 2026 |
| 848 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2026 |
| 849 | Valley Petroleum Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2026 |
| 850 | Vantage Fort Worth Energy LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Sep 2026 |
| 851 | Veritas Energy LLC | San Antonio, TX 78231 | Oil & Gas Operator | Sep 2026 |
| 852 | Veteran Exploration & Prod, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 853 | Vicars Oil & Gas Corporation | Bowie, TX 76230 | Gas Operator | Jul 2010 |
| 854 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jun 2026 |
| 855 | Viola Production Inc | Dallas, TX 75251 | Oil & Gas Operator | Sep 2026 |
| 856 | W & W Production, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2026 |
| 857 | W T X Capital Investments, LLC | Wichita Falls, TX 76308 | Oil Operator | Sep 2026 |
| 858 | W. T. Boyle & Co. | Graham, TX 76450 | Oil Operator | Mar 2008 |
| 859 | Waggoner, W. T., Estate | Vernon, TX 76385 | Oil & Gas Operator | Feb 2018 |
| 860 | Waggoner-Baldridge Oper. Co, Inc | Dallas, TX 75206 | Oil & Gas Operator | Jan 1998 |
| 861 | Walsh & Watts Inc | Aledo, TX 76008 | Oil & Gas Operator | Sep 2026 |
| 862 | Walter Exploration Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 2026 |
| 863 | Walter Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | May 2009 |
| 864 | Ward, L. S. | Graham, TX 76450 | Oil & Gas Operator | Jun 2001 |
| 865 | Watco Energy | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2026 |
| 866 | WB Mullin Operating LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 867 | WBH Energy Partners LLC | Austin, TX 78703 | Oil & Gas Operator | Sep 2026 |
| 868 | Wells Oilfield Services, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 869 | Wes Pro, Inc. | Jacksboro, TX 76458 | Oil Operator | Jan 2013 |
| 870 | Wes-Mor Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 871 | Western Chief Oil & Gas Company | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 872 | Western Chief Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 873 | Westridge Oil & Gas Properties | Mineral Wells, TX 76068 | Oil & Gas Operator | Sep 2026 |
| 874 | WFW Production Company, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 875 | WG Operating, Inc. | Tulsa, OK 74153 | Oil & Gas Operator | May 2012 |
| 876 | White Knight Production LLC | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2024 |
| 877 | White Oak Operating Company LLC | Houston, TX 77077 | Oil & Gas Operator | Sep 2026 |
| 878 | Whitehead Prod. Co., Inc. | Humble, TX 77338 | Oil & Gas Operator | Jun 2026 |
| 879 | Whiting Petroleum Corporation | Denver, CO 80290 | Oil & Gas Operator | Jan 2025 |
| 880 | Whittier Operating Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2007 |
| 881 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 882 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 883 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 884 | Wilton, Frank | Graham, TX 76450 | Oil & Gas Operator | Oct 2016 |
| 885 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Sep 2026 |
| 886 | Wise Exploration | Perrin, TX 76486 | Oil & Gas Operator | Sep 2026 |
| 887 | Wise Production Company | Bowie, TX 76230 | Oil & Gas Operator | Sep 2026 |
| 888 | Wise Supply Company | Bowie, TX 76230 | Oil & Gas Operator | Sep 2026 |
| 889 | Wise Well Service | Bowie, TX 76230 | Oil & Gas Operator | Jul 2017 |
| 890 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 891 | Wolfson, I. J. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2002 |
| 892 | Wolsey Oil Inc. | Bowie, TX 76230 | Oil & Gas Operator | Oct 2013 |
| 893 | Wolsey Well Service, Inc. | Windthorst, TX 76389 | Oil & Gas Operator | Jul 2006 |
| 894 | Wolsey Well Service, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2014 |
| 895 | Woodbine Petroleum, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 896 | Woods, Herbert S. & Assoc. | El Dorado, AR 71730 | Gas Operator | Feb 2023 |
| 897 | World Hydrocarbon, Inc. | Kaufman, TX 75142 | Gas Operator | Apr 1995 |
| 898 | World Producers, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1994 |
| 899 | Worsham-Steed Gas Storage, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2010 |
| 900 | Worsham-Steed Gas Storage, LLC | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2026 |