| 4801 | Torrid Energy Company | | Oil & Gas Operator | Jun 1988 |
| 4802 | Tortuga Oil & Mineral | | Oil & Gas Operator | Dec 1983 |
| 4803 | Tortuga Operating Company | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 4804 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 2025 |
| 4805 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 4806 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 4807 | Touchstone Properties, Inc. | | Oil Operator | Mar 1988 |
| 4808 | Trace Operators, Inc. | | Oil & Gas Operator | Nov 2024 |
| 4809 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 4810 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 4811 | Tradestar Energy, Inc. | Hot Springs, AR 71913 | Oil Operator | Feb 2021 |
| 4812 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 4813 | Trafalgar House Oil & Gas Inc | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 4814 | Traillour Oil Co. | | Oil & Gas Operator | Mar 1990 |
| 4815 | Trans Ocean Oil, Inc. | | Oil & Gas Operator | Sep 1980 |
| 4816 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 4817 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 4818 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 4819 | Trans-Western Exploration Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 4820 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 4821 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 4822 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 4823 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 4824 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 4825 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 4826 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 4827 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 4828 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 4829 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 4830 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 4831 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 4832 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 4833 | Treber Oil Corporation | | Oil & Gas Operator | Sep 2000 |
| 4834 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 4835 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 4836 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 4837 | Trendsetter Production Co, Inc | | Oil & Gas Operator | Jul 2008 |
| 4838 | Tri Investment Company | | Oil Operator | Mar 1980 |
| 4839 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 4840 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 4841 | Tri-Par Exploration, Inc. | | Oil Operator | Oct 2001 |
| 4842 | Tri-Production Company | | Oil Operator | Apr 1994 |
| 4843 | Tri-State Exploration & Prod Inc | Marshall, TX 75671 | Oil & Gas Operator | Aug 2003 |
| 4844 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 4845 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 4846 | Triad Energy Corp Of Texas | Houston, TX 77057-2696 | Oil & Gas Operator | Sep 2014 |
| 4847 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 4848 | Triangle Oil & G G Cornwell | | Oil & Gas Operator | Nov 1981 |
| 4849 | Triangle Oil Of Hosston | | Oil Operator | Jul 2014 |
| 4850 | Triangle Oil Producers Inc | | Oil & Gas Operator | Jun 1998 |
| 4851 | Tribal Oil Company | | Oil & Gas Operator | Dec 1981 |
| 4852 | Tricentrol Resources Inc | Englewood, CO 80111 | Oil & Gas Operator | Jun 1984 |
| 4853 | Trich Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 4854 | Trichel Contracting Company | | Oil & Gas Operator | Sep 1987 |
| 4855 | Trickle Down Oil, Inc. | | Oil & Gas Operator | Feb 2016 |
| 4856 | Trico Energy Corporation | | Oil Operator | May 1984 |
| 4857 | Trico Oil & Gas Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Feb 2026 |
| 4858 | Trico Oil Co., Inc. | | Gas Operator | Nov 1978 |
| 4859 | Trident Oil & Gas Corp. | | Oil & Gas Operator | Sep 2000 |
| 4860 | Trigon Exploration, Inc. | | Oil & Gas Operator | Jan 1999 |
| 4861 | Trinidad Petroleum Corporation | | Oil & Gas Operator | Apr 1990 |
| 4862 | Trinity Operating (Usg), LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 4863 | Trinity Resources, Inc. | Houston, TX 77277 | Oil & Gas Operator | May 2020 |
| 4864 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 4865 | Triple J Investments Inc | Longview, TX 75606 | Oil & Gas Operator | Feb 2023 |
| 4866 | Triple J Oil Co. | Pampa, TX 79065 | Oil & Gas Operator | Aug 1996 |
| 4867 | Triple L Oil Company | Corpus Chrsti, TX 78469 | Oil & Gas Operator | Jan 1998 |
| 4868 | Triple L Operating Company LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 4869 | Triple S Oil Company | | Oil & Gas Operator | Feb 1979 |
| 4870 | Tripower Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2020 |
| 4871 | Tristar Energy 1 | | Oil Operator | Sep 1987 |
| 4872 | Tristate Nla, LLC | | Oil Operator | Dec 2024 |
| 4873 | Triton Oil & Gas Corp. | Houston, TX 77002 | Oil & Gas Operator | Nov 2014 |
| 4874 | Triumph Energy Inc | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2015 |
| 4875 | Triumph Energy Inc-P B Berry | | Oil & Gas Operator | Jun 1986 |
| 4876 | Troy E. Boyd | | Oil Operator | Oct 1998 |
| 4877 | Trunkline Gas Company | | Oil Operator | Mar 2008 |
| 4878 | Tryvest, Inc. | | Oil & Gas Operator | Sep 1991 |
| 4879 | Tucker Operating Co., Inc. | Victoria, TX 77903 | Oil & Gas Operator | Feb 2026 |
| 4880 | Tulip Industries, Inc. | | Oil & Gas Operator | Feb 2024 |
| 4881 | Tundra Energy | | Oil Operator | Jan 2025 |
| 4882 | Tundra Operating LLC | Spring, TX 77386 | Oil Operator | May 2017 |
| 4883 | Turnkey E&P Corporation | | Oil & Gas Operator | Dec 2010 |
| 4884 | TWC Oil Company, Inc. | | Oil Operator | Jan 2025 |
| 4885 | Twin City Gas | | Gas Operator | Nov 1997 |
| 4886 | Twiner Oil & Gas Corporation | | Oil & Gas Operator | Oct 1988 |
| 4887 | Two Bayous, Inc. | | Oil & Gas Operator | Dec 2024 |
| 4888 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Feb 2026 |
| 4889 | Txo Prod Corp.-Arkla Expl. Co. | | Oil & Gas Operator | Dec 1990 |
| 4890 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 4891 | Txo Production Corp/Amh O&G Co | | Oil & Gas Operator | Dec 1990 |
| 4892 | TXP Operating Co. | | Oil & Gas Operator | Jul 1992 |
| 4893 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Feb 2026 |
| 4894 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 4895 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 4896 | Tyler Production, LLC | | Oil & Gas Operator | Jul 2013 |
| 4897 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 4898 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 4899 | U R C C | | Oil & Gas Operator | Jun 1991 |
| 4900 | U S Exploraton Liq Trust | | Oil & Gas Operator | Oct 1994 |