| 801 | Stagg Investment Group, Inc. | Midland, TX 79701 | Oil Operator | May 2013 |
| 802 | Stamper Operating Co., Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |
| 803 | Steele, Mark E. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 804 | Steinberger, D. | Windthorst, TX 76389 | Oil & Gas Operator | Oct 1995 |
| 805 | Steinberger, Gerald | Windthorst, TX 76389 | Oil & Gas Operator | Sep 2007 |
| 806 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 807 | Stevens & Tull, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2000 |
| 808 | Stewart Construction | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 809 | Stewart, James G. | Graham, TX 76450 | Oil & Gas Operator | Sep 2019 |
| 810 | Stivers Inc | Graham, TX 76450 | Oil & Gas Operator | May 2003 |
| 811 | Stivers Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 1995 |
| 812 | Stober Oil And Gas Services, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 813 | Stonebriar Oil LLC | Frisco, TX 75034 | Oil & Gas Operator | Feb 2026 |
| 814 | Stoneburner Exploration, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Oct 1997 |
| 815 | Stoneriver Energy, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Feb 2026 |
| 816 | Stovall Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 817 | Stovall, Troy | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 818 | Strange, D. D. | Archer City, TX 76351 | Oil & Gas Operator | Sep 2014 |
| 819 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Feb 2026 |
| 820 | Street, Spencer B., Jr. | Graham, TX 76450 | Oil & Gas Operator | Mar 1998 |
| 821 | Stroube Energy Corporation | Dallas, TX 75248 | Oil & Gas Operator | Jan 2012 |
| 822 | Stuteville Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Aug 2004 |
| 823 | Subsurface Energy Corp. | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 824 | Sunday Corporation | Olney, TX 76374 | Oil & Gas Operator | Feb 2026 |
| 825 | Sundial Resources, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 826 | Sutherland Energy Co., LLC | Bridgeport, TX 76426 | Oil & Gas Operator | Feb 2026 |
| 827 | Swanner Properties | Wichita Falls, TX 76309 | Oil & Gas Operator | Feb 2026 |
| 828 | Sweetwater Drilling Co., Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 829 | Swenson, Clifford E. | Henrietta, TX 76365 | Oil & Gas Operator | Feb 2026 |
| 830 | SWJN Oil Company | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 831 | Symba American Oil, Inc | Houston, TX 77056 | Oil Operator | Feb 2026 |
| 832 | Synergy Operating Co., LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 833 | T & I Petroleum Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2005 |
| 834 | T C Operating | Archer City, TX 76351 | Oil & Gas Operator | Sep 2016 |
| 835 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 836 | Tahoe Exploration Inc. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2016 |
| 837 | Talus Inc | Graham, TX 76450-1210 | Oil & Gas Operator | Feb 2017 |
| 838 | Tam2 Squared Energy Services,LLC | Rockwall, TX 75032 | Oil Operator | Feb 2026 |
| 839 | Tanglewood Production | Breckenridge, TX 76424 | Oil & Gas Operator | May 2009 |
| 840 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 841 | Targo Oil & Gas, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 842 | Taubert & Steed | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2001 |
| 843 | Taylor, Dutch | Graham, TX 76450 | Oil & Gas Operator | Jan 2016 |
| 844 | TB Petroleum, LLC | Petrolia, TX 76377 | Oil & Gas Operator | Feb 2026 |
| 845 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Feb 2026 |
| 846 | TCT Operating Company, Inc. | Johnson City, TX 78636 | Oil & Gas Operator | Feb 2017 |
| 847 | Teague, J. V. & Robinson, E. W. | Olney, TX 76374 | Oil & Gas Operator | May 1996 |
| 848 | Telesis Operating Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2026 |
| 849 | Tempo Resources GP, LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Apr 2013 |
| 850 | Terry Petroleum Company | Houston, TX 77270 | Oil & Gas Operator | Dec 1997 |
| 851 | Terry, Lewis D. | Olney, TX 76374 | Oil & Gas Operator | Sep 1995 |
| 852 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 853 | Texas Energy Associates | Graham, TX 76450 | Oil & Gas Operator | Nov 1999 |
| 854 | Texas Shallow Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 855 | Texas Utilities Fuel Co. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2018 |
| 856 | Texoma Oil Tools, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 857 | Texu Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jan 2007 |
| 858 | Thompson, Mark P. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 859 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 860 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 861 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Feb 2026 |
| 862 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 863 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 864 | Thunderbird Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 865 | Titan Energy, Inc. | Austin, TX 78703 | Oil & Gas Operator | Feb 2026 |
| 866 | TLH Production LLC | Abilene, TX 79602 | Oil & Gas Operator | Feb 2026 |
| 867 | Tomsha LLC | Bryson, TX 76427 | Oil Operator | Feb 2026 |
| 868 | TR Operating LLC | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 869 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Feb 2026 |
| 870 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 871 | Tracer Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 872 | Tracker Resource Dev III, LLC | Englewood, CO 80112 | Oil & Gas Operator | Jul 2021 |
| 873 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 874 | Tres Azores Oil & Gas, Inc. | Fort Worth, TX 76185 | Oil & Gas Operator | Aug 2003 |
| 875 | Tri "M" Oil & Gas | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 876 | Tri Star Operating, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Jan 2002 |
| 877 | Tri-K Production Company, Inc. | Olney, TX 76374 | Oil & Gas Operator | Apr 1996 |
| 878 | Triangle Energy Co. | Pampa, TX 79066 | Oil & Gas Operator | Nov 2000 |
| 879 | Trio Consulting & Management,LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 880 | Triple "W" Oil Company | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 881 | Triton Energy LLC | Wortham, TX 76693 | Oil & Gas Operator | Feb 2026 |
| 882 | Turner, Randy | Olney, TX 76374 | Oil & Gas Operator | Jan 2005 |
| 883 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 884 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 885 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 886 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Feb 2026 |
| 887 | Underwood, Jim | Graham, TX 76450 | Oil & Gas Operator | Mar 2018 |
| 888 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 889 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 890 | Upda Operators, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2009 |
| 891 | Uptex Operating Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2011 |
| 892 | Uptex Operating, L.P. | Dallas, TX 75201 | Oil & Gas Operator | May 2010 |
| 893 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 894 | Us. Fuels, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 895 | Vandermeer Energy Corp. | Dallas, TX 75225 | Oil & Gas Operator | Nov 1998 |
| 896 | Vanguard Production Company | Lubbock, TX 79410 | Oil & Gas Operator | Feb 2026 |
| 897 | Vantage Fort Worth Energy LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Feb 2026 |
| 898 | Veteran Exploration & Prod, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 899 | Viejo Services, LLC | Boyd, TX 76023 | Oil & Gas Operator | Feb 2026 |
| 900 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |