| 801 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 802 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 803 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 804 | Thomas Oil Company LLC | | Oil Operator | Jan 2024 |
| 805 | Thomas Oilers | | Oil & Gas Operator | Dec 2023 |
| 806 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 807 | Thomas Operating LTD. Co. | Dallas, TX 75220 | Oil & Gas Operator | Apr 2024 |
| 808 | Thomas Production | Electra, TX 76360 | Oil & Gas Operator | Mar 2015 |
| 809 | Thomas Production Co Inc | | Oil & Gas Operator | Mar 2015 |
| 810 | Thomas R Sivley | Southlake, TX 76092 | Oil & Gas Operator | Mar 2013 |
| 811 | Thomas R. Banks | | Oil Operator | Nov 2023 |
| 812 | Thomas Resources Corporation | Monahans, TX 79756 | Oil Operator | Mar 2008 |
| 813 | Thomas Steel Strip Corp | Warren, OH 44485 | Oil & Gas Operator | Dec 2023 |
| 814 | Thomas Turman | | Oil & Gas Operator | Dec 1991 |
| 815 | Thomas Wayne Oil & Gas | Bristow, OK 74010-0544 | Oil & Gas Operator | Jan 2018 |
| 816 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 817 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Dec 2023 |
| 818 | Thomas, B. K. | Plano, TX 75093 | Oil & Gas Operator | Jan 2008 |
| 819 | Thomas, Ellis W | | Oil & Gas Operator | Dec 2023 |
| 820 | Thomas, M.A. Oil Associates | Nocona, TX 76255 | Oil & Gas Operator | Apr 2024 |
| 821 | Thomas, Mark C Operating | | Oil Operator | Aug 2009 |
| 822 | Thomas, Mike | Nixon, TX 78140 | Oil Operator | Apr 2024 |
| 823 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 824 | Thomas, T. N. Oil Company | Aiken, SC 29801 | Oil & Gas Operator | Apr 2024 |
| 825 | Thomas, Vernon C. | Gardner, KS 66030 | Oil Operator | Jun 2015 |
| 826 | Thomason Oil Com | | Oil Operator | Oct 1984 |
| 827 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Dec 2023 |
| 828 | Thomasson Petroleum Enterprises, Inc | Bremen, KY 42325 | Oil Operator | Dec 2018 |
| 829 | Thompson & James Cleo Thompson, Jr.* & J Cleo | | Oil & Gas Operator | Jan 2010 |
| 830 | Thompson Consumer Electronics | Indianapolis, IN 46290 | Oil & Gas Operator | Dec 1998 |
| 831 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 832 | Thompson Energy Resources LLC | | Oil & Gas Operator | Nov 2023 |
| 833 | Thompson Engr & Prod Corp | Farmington, NM 87402 | Oil & Gas Operator | Apr 2019 |
| 834 | Thompson Felton | Dewey, OK 74029 | Oil Operator | Jul 1999 |
| 835 | Thompson Floyd Oil Co Inc | Boca Raton, FL 44328 | Oil & Gas Operator | Dec 1988 |
| 836 | Thompson James R | Okmulgee, OK 74447-0610 | Oil & Gas Operator | Sep 2023 |
| 837 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Dec 2023 |
| 838 | Thompson Operating Co. | Abernathy, TX 79311 | Oil & Gas Operator | Aug 1994 |
| 839 | Thompson Roy G | Bartlesville, OK 74006 | Oil & Gas Operator | Feb 1993 |
| 840 | Thompson, Diana & Glenn | Fredonia, NY 14063 | Gas Operator | Dec 2022 |
| 841 | Thompson, Don W | Herington, KS 67449 | Oil Operator | Jul 2003 |
| 842 | Thompson, J C | Denver, CO 80237-2843 | Oil & Gas Operator | Jul 2005 |
| 843 | Thompson, J. Cleo | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 844 | Thompson, Joe L., Inc. | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 2005 |
| 845 | Thompson, Mark P. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 846 | Thompson, Mark V. | South Dayton, NY 14138 | Gas Operator | Dec 2022 |
| 847 | Thompson, Richard W. Inc. | Plano, TX 75024 | Oil & Gas Operator | Apr 2024 |
| 848 | Thompson, Timothy G. | Delevan, NY 14042 | Gas Operator | Dec 2022 |
| 849 | Thomsen Brothers Co., LLC | Lamont, KS 66855 | Oil Operator | Dec 2023 |
| 850 | Thor Operating Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 1995 |
| 851 | Thor Production Co. | | Oil Operator | May 1997 |
| 852 | Thor-Max Operating, Inc. | Plano, TX 75025 | Oil & Gas Operator | Apr 2024 |
| 853 | Thornberry Family Partnership LTD. | New Waverly, TX 77358 | Oil Operator | Nov 2023 |
| 854 | Thornberry Oilfield Service, Inc | Conroe, TX 77302 | Oil & Gas Operator | Aug 2003 |
| 855 | Thorne Harold & | | Oil Operator | May 1994 |
| 856 | Thornton & Brooks, Inc. | | Oil & Gas Operator | Oct 1990 |
| 857 | Thornton Drilling Company Ptrnship | Eureka, KS 67045 | Oil Operator | Jun 2010 |
| 858 | Thornton Minerals, LLC | Jacksboro, TX 76458 | Gas Operator | Apr 2024 |
| 859 | Thornton Oil Co. | Abilene, TX 79603 | Oil & Gas Operator | Aug 2003 |
| 860 | Thornton Operating Corporation | Fort Worth, TX 76162 | Oil & Gas Operator | Jul 2014 |
| 861 | Thornton Page Natural Gas | | Oil & Gas Operator | Jan 2024 |
| 862 | Thornton, Michael D. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 1995 |
| 863 | Thorofare Resources, Inc | | Oil & Gas Operator | May 2011 |
| 864 | Thoroughbred Associates L.L.C. | Wichita, KS 67226 | Oil & Gas Operator | Dec 2023 |
| 865 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 866 | THP Operating LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Apr 2024 |
| 867 | Thrall Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 868 | Thrall Texas Oil, LLC | | Oil & Gas Operator | Jan 2024 |
| 869 | Thrash, Afton | Kilgore, TX 75663 | Oil & Gas Operator | Apr 1996 |
| 870 | Three "N" One Production | | Oil & Gas Operator | Dec 2011 |
| 871 | Three B Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 872 | Three B, LP | Fort Worth, TX 76179 | Gas Operator | Apr 2024 |
| 873 | Three Bros. Energy, Inc. | Ponca City, OK 74601 | Gas Operator | Dec 2013 |
| 874 | Three C Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Apr 2024 |
| 875 | Three D Oil Comp | | Oil & Gas Operator | Jan 1988 |
| 876 | Three D Petroleum LLC | | Oil Operator | Dec 2023 |
| 877 | Three D Submersible Pumps, Inc. | Heavener, OK 74937 | Oil & Gas Operator | Aug 2003 |
| 878 | Three Forks Operating Co, LLC | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2024 |
| 879 | Three Forks Resources LLC | Wheat Ridge, CO 80033 | Oil & Gas Operator | Apr 2024 |
| 880 | Three G Inc | Cody, WY 82414 | Oil & Gas Operator | Dec 1999 |
| 881 | Three G Oil Co | Baird, TX 79504 | Oil & Gas Operator | Jun 2004 |
| 882 | Three J Energy, Inc. | Seguin, TX 78155 | Oil & Gas Operator | Apr 2024 |
| 883 | Three J Operating Company, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2024 |
| 884 | Three J'S Petroleum, Inc. | Lubbock, TX 79452 | Oil & Gas Operator | Apr 2024 |
| 885 | Three MG Family Inc | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 886 | Three Mile Joint Venture | Houston, TX 77027 | Oil & Gas Operator | Jul 1995 |
| 887 | Three P Operating Co.,GP, L.L.C. | Newcastle, TX 76372 | Oil & Gas Operator | Apr 2024 |
| 888 | Three P Operating Company | Newcastle, TX 76372 | Oil & Gas Operator | Nov 2007 |
| 889 | Three R Oil Company | Post, TX 79356 | Oil & Gas Operator | Apr 2024 |
| 890 | Three Rivers Exploration LLC | Olpe, KS 66865 | Oil Operator | Sep 2023 |
| 891 | Three Rivers Oper Co III LLC | Austin, TX 78735 | Oil & Gas Operator | Nov 2017 |
| 892 | Three Rivers Operating Co II LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 893 | Three Rivers Operating Co LLC | Austin, TX 78735 | Oil & Gas Operator | Mar 2017 |
| 894 | Three S & T Oil Co., Inc. | | Oil & Gas Operator | May 1985 |
| 895 | Three Sands Investment Company | Waukomis, OK 73773-0370 | Oil & Gas Operator | Dec 2023 |
| 896 | Three Sands Oil Inc | Perry, OK 73077-0853 | Oil & Gas Operator | May 2023 |
| 897 | Three Sisters Investments, LTD | | Oil & Gas Operator | Oct 1989 |
| 898 | Three Sisters LLC | Cheyenne, WY 82001 | Oil Operator | Feb 2024 |
| 899 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jan 2024 |
| 900 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |