| 801 | The Hampton Oil Corporation | | Oil & Gas Operator | Aug 2014 |
| 802 | The Harter Family Trust Of 1995 | | Oil Operator | Dec 2003 |
| 803 | The Harvest Group, LLC | | Oil & Gas Operator | May 2011 |
| 804 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 805 | The Krik Company | | Oil Operator | Dec 2004 |
| 806 | The KT Oil Company LLC | Ada, OK 74820 | Oil & Gas Operator | Nov 2025 |
| 807 | The Lansdale Co. | | Oil & Gas Operator | Dec 2025 |
| 808 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 809 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 810 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 811 | The Nahabedian Exploration Group LLC | | Oil & Gas Operator | Nov 2025 |
| 812 | The Ny Conf. Assoc. Of Seventh-Day Adventists | Syracuse, NY 13215 | Gas Operator | Dec 2024 |
| 813 | The Ohio Oil Company | | Oil Operator | Jan 2025 |
| 814 | The Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2007 |
| 815 | The Ozark Corp. | | Oil Operator | Apr 1970 |
| 816 | The Pioneer | | Gas Operator | Feb 2008 |
| 817 | The Port Of Long Beach | | Oil & Gas Operator | Dec 1997 |
| 818 | The Procter And Gamble Co. | | Gas Operator | Dec 1989 |
| 819 | The Production Co | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2012 |
| 820 | The Production Co LLC | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2020 |
| 821 | The Pyramid Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2009 |
| 822 | The Quintin Little Company Inc | Ardmore, OK 73401 | Oil & Gas Operator | Dec 2025 |
| 823 | The Raven Company LLC | Granbury, TX 76049 | Oil Operator | Mar 2010 |
| 824 | The Richardson Petroleum Corporation | Whitesville, NY 14897 | Oil & Gas Operator | Dec 2024 |
| 825 | The Robert And Donna Harwood Income Only Trust | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 826 | The Romanoff Corporation | | Oil & Gas Operator | Nov 1989 |
| 827 | The Southern Louisiana Expl. Company LLC | | Oil & Gas Operator | Nov 2024 |
| 828 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 829 | The Stone Petro Corp-Toce Oil | | Oil & Gas Operator | Oct 1984 |
| 830 | The Superior Oc WM Scully Etal | | Oil & Gas Operator | Apr 1986 |
| 831 | The Superior Oil Co & Pel-Tex | | Oil & Gas Operator | Apr 1986 |
| 832 | The Superior Oil Co - Tesoro | | Oil & Gas Operator | Apr 1986 |
| 833 | The Sylvester Oil Co, LLC | League City, TX 77573 | Oil Operator | Aug 2025 |
| 834 | The Termo Company | Long Beach, CA 90801 | Oil & Gas Operator | Dec 2025 |
| 835 | The Texas Company | FT Worth, TX 76101 | Oil & Gas Operator | Dec 2013 |
| 836 | The Trees Oil Company | Wichita, KS 67208 | Oil & Gas Operator | Nov 2014 |
| 837 | The Twenty Eleven Corp Inc | Ada, OK 74820-3605 | Oil Operator | Nov 2025 |
| 838 | The William R Earnhardt Company | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 839 | The WM G Helis Company, L.L.C. | | Oil & Gas Operator | Nov 2003 |
| 840 | The Woods Parcel, LLC | Orchard Park, NY 14127 | Gas Operator | Dec 2024 |
| 841 | Theisen, VIncent A. | Wilmington, DE 19807 | Oil & Gas Operator | Sep 2003 |
| 842 | Theodore W Ochs | Lucinda, PA 16235-3517 | Gas Operator | Dec 2009 |
| 843 | Thigpin Operating, LLC | Odessa, TX 79762 | Oil Operator | Feb 2026 |
| 844 | Third Coast Energy, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Feb 2026 |
| 845 | Tholl Oil Company | | Oil Operator | Dec 2003 |
| 846 | Thomas A. Blanton | | Oil Operator | Oct 2025 |
| 847 | Thomas Aitken, Inc. | | Gas Operator | Dec 2024 |
| 848 | Thomas And Ruby Parkinson Trust | Tatum, NM 88267 | Oil & Gas Operator | Dec 2025 |
| 849 | Thomas B Rixleben | | Oil & Gas Operator | Jul 2008 |
| 850 | Thomas Bell | | Oil Operator | Dec 1985 |
| 851 | Thomas C. Hoffpauir | | Oil & Gas Operator | Mar 1991 |
| 852 | Thomas C. Hoffpauir, Inc. | | Oil & Gas Operator | Jan 1981 |
| 853 | Thomas C. King | | Oil & Gas Operator | Dec 1995 |
| 854 | Thomas E L | Tulsa, OK 74136-6302 | Oil & Gas Operator | Feb 2015 |
| 855 | Thomas E. Slack | | Oil Operator | Mar 2003 |
| 856 | Thomas Exploration & Devel., Inc | Jourdanton, TX 78026 | Oil & Gas Operator | Feb 2026 |
| 857 | Thomas Exploration Company | Tulsa, OK 74136-6302 | Oil & Gas Operator | Nov 2025 |
| 858 | Thomas G. Easterling | | Oil Operator | Jun 1989 |
| 859 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Sep 2025 |
| 860 | Thomas J L Engineering Inc | Edmond, OK 73003-0026 | Oil & Gas Operator | Jul 2016 |
| 861 | Thomas L Spring LLC | | Gas Operator | Dec 2025 |
| 862 | Thomas M. Brown LLC | Plainville, KS 67663 | Oil Operator | Sep 2025 |
| 863 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 864 | Thomas Oil And Gas Inc. | San Angelo, TX 76906 | Oil & Gas Operator | May 2019 |
| 865 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 866 | Thomas Oil Company LLC | Ardmore, OK 73401-3717 | Oil Operator | Dec 2025 |
| 867 | Thomas Oilers | | Oil & Gas Operator | Dec 2025 |
| 868 | Thomas Operating Company Inc | Greeley, CO 80634 | Oil & Gas Operator | Aug 2008 |
| 869 | Thomas Operating LTD. Co. | Dallas, TX 75220 | Oil & Gas Operator | Feb 2026 |
| 870 | Thomas Production | Electra, TX 76360 | Oil & Gas Operator | Mar 2015 |
| 871 | Thomas R Sivley | Southlake, TX 76092 | Oil & Gas Operator | Mar 2013 |
| 872 | Thomas R. Banks | | Oil Operator | Nov 2025 |
| 873 | Thomas Resources Corporation | Monahans, TX 79756 | Oil Operator | Mar 2008 |
| 874 | Thomas Steel Strip Corp | Warren, OH 44485 | Oil & Gas Operator | Dec 2024 |
| 875 | Thomas Turman | | Oil & Gas Operator | Dec 1991 |
| 876 | Thomas Wayne Oil & Gas | Bristow, OK 74010-0544 | Oil & Gas Operator | Jan 2018 |
| 877 | Thomas Well Serv | | Oil Operator | Dec 1996 |
| 878 | Thomas Well Service, Inc. | Easton, KS 66020 | Oil Operator | Sep 2025 |
| 879 | Thomas, B. K. | Plano, TX 75093 | Oil & Gas Operator | Jan 2008 |
| 880 | Thomas, Ellis W | | Oil & Gas Operator | Nov 2025 |
| 881 | Thomas, M.A. Oil Associates | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 882 | Thomas, Mike | Nixon, TX 78140 | Oil Operator | Feb 2026 |
| 883 | Thomas, R. W. Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 884 | Thomas, T. N. Oil Company | Aiken, SC 29801 | Oil & Gas Operator | Feb 2026 |
| 885 | Thomas, Vernon C. | Gardner, KS 66030 | Oil Operator | Jun 2015 |
| 886 | Thomason Oil Com | | Oil Operator | Oct 1984 |
| 887 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 888 | Thomasson Petroleum Enterprises, Inc | Bremen, KY 42325 | Oil Operator | Dec 2018 |
| 889 | Thomfield Energy LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 890 | Thompson Consumer Electronics | Indianapolis, IN 46290 | Oil & Gas Operator | Dec 1998 |
| 891 | Thompson Drilling Company, Inc. | Independence, KS 67301 | Oil Operator | Sep 2001 |
| 892 | Thompson Energy Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 893 | Thompson Engr & Prod Corp | Farmington, NM 87402 | Oil & Gas Operator | Apr 2019 |
| 894 | Thompson Felton | Dewey, OK 74029 | Oil Operator | Jul 1999 |
| 895 | Thompson Floyd Oil Co Inc | Boca Raton, FL 44328 | Oil & Gas Operator | Dec 1988 |
| 896 | Thompson James R | Okmulgee, OK 74447 | Oil & Gas Operator | Sep 2025 |
| 897 | Thompson Oil Co. | Corsicana, TX 75151 | Oil & Gas Operator | Nov 2025 |
| 898 | Thompson Operating Co. | Abernathy, TX 79311 | Oil & Gas Operator | Aug 1994 |
| 899 | Thompson Roy G | Bartlesville, OK 74006 | Oil & Gas Operator | Feb 1993 |
| 900 | Thompson, Diana & Glenn | Fredonia, NY 14063 | Gas Operator | Dec 2024 |