| 30801 | Tuscola Energy Inc | | Oil & Gas Operator | Jan 2025 |
| 30802 | Tuskar (Texas), Inc. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jan 2016 |
| 30803 | Tussel Clarence Jr | Jefferson, OH 44047 | Oil & Gas Operator | Dec 2019 |
| 30804 | Tutcher, Dan C. | Houston, TX 77002 | Oil Operator | Dec 2004 |
| 30805 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 30806 | Tuthill S Keith & Bill Barbee | Amarillo, TX 79101-1427 | Oil & Gas Operator | Dec 2004 |
| 30807 | Tuway Oil, Inc | | Oil & Gas Operator | Jun 2006 |
| 30808 | TW Phillips Gas Supply Corp | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2011 |
| 30809 | TWC Oil Company | | Oil Operator | Jan 2025 |
| 30810 | Twenty First Century Res Inc | Lajolla, CA 92037-7044 | Oil & Gas Operator | Mar 2015 |
| 30811 | Twenty/Twenty Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 30812 | Twilco Operating LLC | Holliday, TX 76366 | Oil Operator | Apr 2025 |
| 30813 | Twilight Energy LLC | Fort Worth, TX 76185 | Oil & Gas Operator | Apr 2025 |
| 30814 | Twin Arrow Inc | Rangely, CO 81648 | Oil & Gas Operator | Sep 2009 |
| 30815 | Twin City Gas | | Gas Operator | Nov 1997 |
| 30816 | Twin Eagle Petro | | Oil Operator | Aug 1990 |
| 30817 | Twin Eagle Petroleum Corp | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2002 |
| 30818 | Twin M, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Dec 2024 |
| 30819 | Twin Oaks Construction Company | Irving, TX 75063 | Oil & Gas Operator | Apr 2025 |
| 30820 | Twin Oil Partnership LLC | | Oil Operator | Dec 2023 |
| 30821 | Twin Star Petrol | | Oil & Gas Operator | Jan 1989 |
| 30822 | Twin Star Petroleum, Inc. | Tulsa, OK 74146 | Gas Operator | Feb 1998 |
| 30823 | Twiner Oil & Gas Corporation | | Oil & Gas Operator | Oct 1988 |
| 30824 | Twinoaks Oil & Gas Co | Newark, OH 43058-0764-0764 | Oil & Gas Operator | Dec 2024 |
| 30825 | Twinoco | Caney, KS 67333 | Oil Operator | Nov 1996 |
| 30826 | Twins Oil Co. | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 30827 | Twisted Oak Operating LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 30828 | Twisted Resources Inc | Blanchard, OK 73010-8463 | Oil & Gas Operator | Feb 2025 |
| 30829 | TWM Production Co., A General Partnership | Chanute, KS 66720 | Oil Operator | Dec 2024 |
| 30830 | Two Bay Petroleum | | Oil & Gas Operator | Dec 2010 |
| 30831 | Two Bayous, Inc. | | Oil & Gas Operator | Dec 2024 |
| 30832 | Two Bit Operating Company LLC | Fort Worth, TX 76110 | Oil & Gas Operator | Apr 2025 |
| 30833 | Two Black Bears Oil, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2003 |
| 30834 | Two Gems Company | McAlester, OK 74502-1996 | Oil & Gas Operator | Jan 2025 |
| 30835 | Two Oaks Operating Company, LLC. | Flower Mound, TX 75028 | Oil & Gas Operator | Mar 2008 |
| 30836 | Two P Partners, LLC | Golden, CO 80401 | Oil & Gas Operator | Apr 2025 |
| 30837 | Two Pines | Drumright, OK 74030-5502 | Oil & Gas Operator | Feb 2012 |
| 30838 | Twojo, Inc. | Longview, TX 75601 | Oil & Gas Operator | Nov 1996 |
| 30839 | TX Heat Of The Permian Basin Inc | Odessa, TX 79768 | Oil & Gas Operator | Dec 2021 |
| 30840 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Apr 2025 |
| 30841 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |
| 30842 | Txco Resources Inc. | San Antonio, TX 78280 | Oil & Gas Operator | Apr 2025 |
| 30843 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Apr 2025 |
| 30844 | Txo Prod Corp.-Arkla Expl. Co. | | Oil & Gas Operator | Dec 1990 |
| 30845 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 30846 | Txo Production Corp/Amh O&G Co | | Oil & Gas Operator | Dec 1990 |
| 30847 | Txok Energy Resources Company | Tulsa, OK 74172-0140 | Oil & Gas Operator | Feb 2017 |
| 30848 | Txok Texas Energy Resources,L.P. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2008 |
| 30849 | Txon Partners, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2017 |
| 30850 | TXP Operating Company | | Oil & Gas Operator | Jul 1992 |
| 30851 | TXP, Incorporated | San Angelo, TX 76906 | Oil & Gas Operator | Apr 2025 |
| 30852 | Txu Fuel Company | Dallas, TX 75201 | Oil & Gas Operator | May 2004 |
| 30853 | Txu Gas Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2004 |
| 30854 | Txu Lone Star Pipeline | Dallas, TX 75201 | Oil & Gas Operator | Oct 2003 |
| 30855 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Apr 2025 |
| 30856 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 30857 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 30858 | Tyco Oil Co. | | Oil Operator | Oct 2024 |
| 30859 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Apr 2025 |
| 30860 | Tyco, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jan 1998 |
| 30861 | Tyco, Inc. (Colorado Corporation) | Independence, KS 67301 | Gas Operator | Jun 1998 |
| 30862 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 30863 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 30864 | Tyler Enterprises Inc | Bristow, OK 74010-3192 | Oil & Gas Operator | Feb 2004 |
| 30865 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 30866 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 30867 | Tyler Production, LLC | | Oil & Gas Operator | Jul 2013 |
| 30868 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2024 |
| 30869 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Nov 2024 |
| 30870 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Apr 2025 |
| 30871 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 30872 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 30873 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 30874 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 30875 | Tyson Gary | Hobart, OK 73651-6413 | Oil & Gas Operator | Mar 2018 |
| 30876 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 30877 | Tyson Olan | Hobart, OK 73651-6413 | Oil & Gas Operator | Apr 2015 |
| 30878 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 30879 | U Bee Tea Production LLC | Culbertson, MT 59218 | Oil & Gas Operator | Feb 2025 |
| 30880 | U R C C | | Oil & Gas Operator | Jun 1991 |
| 30881 | U S Department Of Energy | | Oil & Gas Operator | Apr 1999 |
| 30882 | U S Drilling Company Inc | Holdenville, OK 74848-0913 | Oil & Gas Operator | Mar 2017 |
| 30883 | U S Energy Corp | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 30884 | U S Energy Corp. Of Amer. Inc. | Ranger, TX 76470 | Oil & Gas Operator | Apr 2025 |
| 30885 | U S Exploraton Liq Trust | | Oil & Gas Operator | Oct 1994 |
| 30886 | U S Liquids Of La., L.P. | | Oil Operator | Apr 2014 |
| 30887 | U S Oil Reclaimers LLC | Drumright, OK 74030-1155 | Oil Operator | Jun 2023 |
| 30888 | U V Industries | | Oil & Gas Operator | Jan 1993 |
| 30889 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 30890 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 30891 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2025 |
| 30892 | U. O. C., Inc. | | Oil Operator | Jun 2019 |
| 30893 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2025 |
| 30894 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |
| 30895 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 30896 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 30897 | U.S. Energy Development Corp | Fort Worth, TX 76164 | Oil & Gas Operator | Apr 2025 |
| 30898 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 30899 | U.S. Sovereign Oil And Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Apr 2025 |
| 30900 | U.S. Steel Mining Co., Inc. | | Gas Operator | Jan 2000 |