| 30801 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 30802 | Trans Ocean Oil, Inc. | | Oil & Gas Operator | Sep 1980 |
| 30803 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 30804 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Dec 2025 |
| 30805 | Trans Resource D | | Oil Operator | May 1991 |
| 30806 | Trans Terra Corp Int'L | Amarillo, TX 79159-0370 | Oil & Gas Operator | Jul 1993 |
| 30807 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 30808 | Trans Texas Minerals Company | Austin, TX 78714 | Oil & Gas Operator | Aug 1999 |
| 30809 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 30810 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 30811 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 30812 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 30813 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 30814 | Trans-Texas Energy Group LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Jul 2015 |
| 30815 | Trans-Western Exploration Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 30816 | Trans-Western Operating Company | Golden, CO 80402 | Oil Operator | Jun 2025 |
| 30817 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 30818 | Transamerica Energy Corp. | Atlanta, GA 30356 | Oil & Gas Operator | Feb 2026 |
| 30819 | Transamerica Oil | | Oil & Gas Operator | Sep 1992 |
| 30820 | Transamerica Oil Corporation | Hutchinson, KS 67504 | Gas Operator | Mar 2025 |
| 30821 | Transamerican Energy LTD | Dallas, TX 75231-1075 | Oil & Gas Operator | Apr 2014 |
| 30822 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 30823 | Transamerican Natural Gas Corp. | Houston, TX 77032 | Oil & Gas Operator | Aug 2000 |
| 30824 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 30825 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 30826 | Transatlantic Petr (USA) Corp. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 30827 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 30828 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 30829 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 30830 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | Dec 2025 |
| 30831 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 30832 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 30833 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 30834 | Transcontinental Oil & Gas Inc | Aurora, OH 44202 | Oil & Gas Operator | Dec 2024 |
| 30835 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 30836 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 30837 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 30838 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 30839 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 30840 | Transit Energy Inc | North Lawrence, OH 44666 | Oil & Gas Operator | Dec 2024 |
| 30841 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Feb 2026 |
| 30842 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 30843 | Transp Investment Group | Fairview, PA 16415-1530 | Gas Operator | Dec 1999 |
| 30844 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 30845 | Transpacific Energy, LLC | Katy, TX 77450 | Oil & Gas Operator | Feb 2026 |
| 30846 | Transpetco I | Shreveport, LA 71101 | Oil & Gas Operator | May 2009 |
| 30847 | Transpetco Transport Company | Shreveport, LA 71101-5370 | Oil Operator | Jun 2008 |
| 30848 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 30849 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 30850 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 30851 | Trap Rock Oil Company | Cambridge, MA 02138 | Oil & Gas Operator | Nov 2005 |
| 30852 | Trap Rock Oil, LTD. | Houston, TX 77005 | Oil & Gas Operator | Feb 2026 |
| 30853 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 30854 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 30855 | Travco Well Servicing LLC | Okmulgee, OK 74447 | Oil Operator | Nov 2025 |
| 30856 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Feb 2026 |
| 30857 | Travell Energy, Inc | | Oil Operator | Dec 2023 |
| 30858 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 30859 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 30860 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 30861 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 30862 | Traverse Oil Co | | Oil Operator | Nov 1983 |
| 30863 | Traverse Oil Co And Federal Oil Co | | Oil Operator | Nov 1983 |
| 30864 | Travis Coomer DRLG Co | | Oil Operator | Dec 2023 |
| 30865 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 30866 | Travis Oil Co | Los Angeles, CA 90024 | Oil Operator | Jan 1990 |
| 30867 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | Feb 2026 |
| 30868 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 30869 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 30870 | Traxler, Joyce | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 30871 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 30872 | TRC Cypress Group LLC | | Oil & Gas Operator | Nov 2025 |
| 30873 | TRC Operating Company Inc. | | Oil & Gas Operator | Dec 2025 |
| 30874 | Tre'J Exploration, Inc. | | Gas Operator | Dec 1991 |
| 30875 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | Feb 2026 |
| 30876 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 30877 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | Feb 2026 |
| 30878 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 30879 | Treber Oil Corporation | | Oil & Gas Operator | Sep 2000 |
| 30880 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 30881 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Feb 2026 |
| 30882 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 30883 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 30884 | Trees Oil Compan | | Oil Operator | Jan 1995 |
| 30885 | Trejim Operators, LLC | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 30886 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 30887 | Trek Exploration, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Feb 2026 |
| 30888 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 30889 | Trek Operating, LLC | Tulsa, OK 741520098 | Oil & Gas Operator | Mar 2021 |
| 30890 | Trek Petroleum Company, Inc. | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 30891 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 30892 | Tremblay, Gail R. & Alan B. | Van Etten, NY 14889 | Gas Operator | Dec 2024 |
| 30893 | Tremo Corporation | Toronto, KS 66777 | Oil Operator | May 1998 |
| 30894 | Tren Energy LLC | El Paso, TX 79912 | Oil & Gas Operator | Feb 2026 |
| 30895 | Trenchco Inc | Shawnee, OK 74802-3577 | Oil & Gas Operator | Apr 2015 |
| 30896 | Trend Exploration Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2008 |
| 30897 | Trend Exploration I LLC | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 30898 | Trend Gas & Oil Inc | Jenks, OK 74037 | Oil & Gas Operator | Dec 2000 |
| 30899 | Trend Oil Co | Petaluma, CA 94954 | Oil & Gas Operator | Feb 2017 |
| 30900 | Trend Properties | Olathe, KS 66061 | Gas Operator | Dec 1996 |