| 801 | The Texas Company | FT Worth, TX 76101 | Oil & Gas Operator | Dec 2013 |
| 802 | The Trees Oil Company | Wichita, KS 67208 | Oil & Gas Operator | Nov 2014 |
| 803 | The Twenty Eleven Corp Inc | Ada, OK 74820-3605 | Oil Operator | Jan 2026 |
| 804 | The William R Earnhardt Company | Bristow, OK 74010 | Oil & Gas Operator | Jan 2026 |
| 805 | The WM G Helis Company, L.L.C. | | Oil & Gas Operator | Nov 2003 |
| 806 | The Woods Parcel, LLC | Orchard Park, NY 14127 | Gas Operator | Dec 2024 |
| 807 | Theisen, VIncent A. | Wilmington, DE 19807 | Oil & Gas Operator | Sep 2003 |
| 808 | Thigpin Operating, LLC | Odessa, TX 79762 | Oil Operator | Apr 2026 |
| 809 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 810 | Thomas A. Blanton | | Oil Operator | Oct 2025 |
| 811 | Thomas Aitken, Inc. | | Gas Operator | Dec 2024 |
| 812 | Thomas And Ruby Parkinson Trust | Tatum, NM 88267 | Oil & Gas Operator | Feb 2026 |
| 813 | Thomas B Rixleben | | Oil & Gas Operator | Jul 2008 |
| 814 | Thomas Bell | | Oil Operator | Dec 1985 |
| 815 | Thomas Blankenship Dba B S Oil Company | Lindsay, OK 73052 | Oil & Gas Operator | Dec 2025 |
| 816 | Thomas C. Hoffpauir | | Oil & Gas Operator | Mar 1991 |
| 817 | Thomas C. Hoffpauir, Inc. | | Oil & Gas Operator | Jan 1981 |
| 818 | Thomas C. King | | Oil & Gas Operator | Dec 1995 |
| 819 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 820 | Thomas E. Slack | | Oil Operator | Mar 2003 |
| 821 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | Apr 2026 |
| 822 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Jan 2026 |
| 823 | Thomas G. Easterling | | Oil Operator | Jun 1989 |
| 824 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Dec 2025 |
| 825 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 826 | Thomas L Spring LLC | | Gas Operator | Jan 2026 |
| 827 | Thomas M. Brown LLC | Plainville, KS 67663 | Oil Operator | Dec 2025 |
| 828 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 829 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 830 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 831 | Thomas Oil Company LLC | Ardmore, OK 73401-3717 | Oil Operator | Feb 2026 |
| 832 | Thomas Oilers | | Oil & Gas Operator | Dec 2025 |
| 833 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 834 | Thomas Operating LTD. Co. | Dallas, TX 75220 | Oil & Gas Operator | Apr 2026 |
| 835 | Thomas Production | Electra, TX 76360 | Oil & Gas Operator | Mar 2015 |
| 836 | Thomas R Sivley | Southlake, TX 76092 | Oil & Gas Operator | Mar 2013 |
| 837 | Thomas R. Banks | | Oil Operator | Dec 2025 |
| 838 | Thomas Resources Corporation | Monahans, TX 79756 | Oil Operator | Mar 2008 |
| 839 | Thomas Steel Strip Corp | Warren, OH 44485 | Oil & Gas Operator | Dec 2025 |
| 840 | Thomas Turman | | Oil & Gas Operator | Dec 1991 |
| 841 | Thomas Wayne Oil & Gas | Bristow, OK 74010-0544 | Oil & Gas Operator | Jan 2018 |
| 842 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 843 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Dec 2025 |
| 844 | Thomas, B. K. | Plano, TX 75093 | Oil & Gas Operator | Jan 2008 |
| 845 | Thomas, Ellis W | | Oil & Gas Operator | Jan 2026 |
| 846 | Thomas, M.A. Oil Associates | Nocona, TX 76255 | Oil & Gas Operator | Apr 2026 |
| 847 | Thomas, Mike | Nixon, TX 78140 | Oil Operator | Apr 2026 |
| 848 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 849 | Thomas, T. N. Oil Company | Aiken, SC 29801 | Oil & Gas Operator | Apr 2026 |
| 850 | Thomas, Vernon C. | Gardner, KS 66030 | Oil Operator | Jun 2015 |
| 851 | Thomason Oil Com | | Oil Operator | Oct 1984 |
| 852 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 853 | Thomasson Petroleum Enterprises, Inc | Bremen, KY 42325 | Oil Operator | Dec 2024 |
| 854 | Thomfield Energy LLC | Kilgore, TX 75663 | Oil Operator | Apr 2026 |
| 855 | Thompson Consumer Electronics | Indianapolis, IN 46290 | Oil & Gas Operator | Dec 1998 |
| 856 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 857 | Thompson Energy Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 858 | Thompson Engr & Prod Corp | Farmington, NM 87402 | Oil & Gas Operator | Apr 2019 |
| 859 | Thompson Felton | Dewey, OK 74029 | Oil Operator | Jul 1999 |
| 860 | Thompson Floyd Oil Co Inc | Boca Raton, FL 44328 | Oil & Gas Operator | Dec 1988 |
| 861 | Thompson James R | Okmulgee, OK 74447 | Oil & Gas Operator | Sep 2025 |
| 862 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2025 |
| 863 | Thompson Operating Co. | Abernathy, TX 79311 | Oil & Gas Operator | Aug 1994 |
| 864 | Thompson Roy G | Bartlesville, OK 74006 | Oil & Gas Operator | Feb 1993 |
| 865 | Thompson, Diana & Glenn | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 866 | Thompson, Don W | Herington, KS 67449 | Oil Operator | Jul 2003 |
| 867 | Thompson, J C | Denver, CO 80237-2843 | Oil & Gas Operator | Jul 2005 |
| 868 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 869 | Thompson, Joe L., Inc. | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 2005 |
| 870 | Thompson, Kenneth L | Clarence Center, NY 14032 | Gas Operator | Dec 2024 |
| 871 | Thompson, Mark P. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 872 | Thompson, Mark V. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 873 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Apr 2026 |
| 874 | Thompson, Timothy G. | Delevan, NY 14042 | Gas Operator | Dec 2024 |
| 875 | Thomsen Brothers Co., LLC | Lamont, KS 66855 | Oil Operator | Dec 2025 |
| 876 | Thor Operating Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 1995 |
| 877 | Thor Production Co. | | Oil Operator | May 1997 |
| 878 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Apr 2026 |
| 879 | Thornberry Family Partnership LTD. | New Waverly, TX 77358 | Oil Operator | Nov 2025 |
| 880 | Thornberry Oilfield Service, Inc | Conroe, TX 77302 | Oil & Gas Operator | Aug 2003 |
| 881 | Thorne Harold & | | Oil Operator | May 1994 |
| 882 | Thornton & Brooks, Inc. | | Oil & Gas Operator | Oct 1990 |
| 883 | Thornton Drilling Company Ptrnship | Eureka, KS 67045 | Oil Operator | Jun 2010 |
| 884 | Thornton Oil Co. | Abilene, TX 79603 | Oil & Gas Operator | Aug 2003 |
| 885 | Thornton Operating Corporation | Fort Worth, TX 76162 | Oil & Gas Operator | Jul 2014 |
| 886 | Thornton Page Natural Gas | | Oil & Gas Operator | Dec 2024 |
| 887 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 888 | Thoroughbred Associates LLC | Wichita, KS 67226 | Oil & Gas Operator | Dec 2025 |
| 889 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 890 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2026 |
| 891 | THR Oil | Konawa, OK 74849 | Oil & Gas Operator | Jan 2014 |
| 892 | Thrall Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 893 | Thrall Texas Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 894 | Thrash, Afton | Kilgore, TX 75663 | Oil & Gas Operator | Apr 1996 |
| 895 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 896 | Three B Corporation | Fort Worth, TX 76179 | Gas Operator | Jun 2009 |
| 897 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 898 | Three B, LP | Fort Worth, TX 76179 | Gas Operator | Apr 2026 |
| 899 | Three Bros. Energy, Inc. | Ponca City, OK 74601 | Gas Operator | Dec 2013 |
| 900 | Three C Exploration, LLC | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 2026 |