| 29801 | TXX Operating LLC | Shreveport, LA 71133 | Oil & Gas Operator | Sep 2026 |
| 29802 | Ty-Tex Exploration, Inc. | Tyler, TX 75711 | Oil Operator | Dec 2000 |
| 29803 | Tyco Incorporate | | Oil & Gas Operator | Oct 1995 |
| 29804 | Tyco Oil Co. | | Oil Operator | Apr 2026 |
| 29805 | Tyco Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Sep 2026 |
| 29806 | Tygr Operating Company, LLC | | Oil & Gas Operator | Nov 2024 |
| 29807 | Tyl Oil | Canon City, CO 81212 | Gas Operator | May 1994 |
| 29808 | Tyler Enterprises Inc | Bristow, OK 74010-3192 | Oil & Gas Operator | Feb 2004 |
| 29809 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |
| 29810 | Tyler Oil Company | Billings, MT 59104-3203 | Oil & Gas Operator | Nov 2019 |
| 29811 | Tyler Production, LLC | | Oil & Gas Operator | Jul 2013 |
| 29812 | Tyler Rockies Exploration LTD | Tyler, TX 75710-0119 | Oil & Gas Operator | Dec 2025 |
| 29813 | Tyler, Scott A | | Oil & Gas Operator | Jun 2026 |
| 29814 | Tyler, Steven Lee | | Oil Operator | May 2014 |
| 29815 | Tyluka Operations, LLC | Hays, KS 67601 | Oil Operator | Mar 2026 |
| 29816 | Tyner Texas Operating Company | Dallas, TX 75248 | Oil & Gas Operator | Sep 2026 |
| 29817 | Tyrex Oil Company | Casper, WY 82602 | Oil & Gas Operator | May 1997 |
| 29818 | Tyro Oil Develop | | Oil Operator | Jul 1991 |
| 29819 | Tyrok | | Oil & Gas Operator | Nov 2010 |
| 29820 | Tysco Oil And Gas Corp. | | Oil & Gas Operator | Dec 2024 |
| 29821 | Tyson Gary | Hobart, OK 73651-6413 | Oil & Gas Operator | Mar 2018 |
| 29822 | Tyson Oil Co. | | Oil Operator | Jan 2025 |
| 29823 | Tyson Olan | Hobart, OK 73651-6413 | Oil & Gas Operator | Apr 2015 |
| 29824 | Tytan Operating Company LLC | Edmond, OK 73083-3794 | Oil & Gas Operator | May 2016 |
| 29825 | U Bee Tea Production LLC | Culbertson, MT 59218 | Oil & Gas Operator | Mar 2026 |
| 29826 | U R C C | | Oil & Gas Operator | Jun 1991 |
| 29827 | U S Drilling Company Inc | Holdenville, OK 74848-0913 | Oil & Gas Operator | Mar 2017 |
| 29828 | U S Energy Corp. Of Amer. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Sep 2026 |
| 29829 | U S Exploraton Liq Trust | | Oil & Gas Operator | Oct 1994 |
| 29830 | U S Liquids Of La., L.P. | | Oil Operator | Apr 2014 |
| 29831 | U V Industries | | Oil & Gas Operator | Jan 1993 |
| 29832 | U-N-I Exploratio | | Oil & Gas Operator | Dec 1990 |
| 29833 | U-N-I Exploration & Development, Inc. | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2003 |
| 29834 | U. D. Man, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Sep 2026 |
| 29835 | U. O. C., Inc. | | Oil Operator | Jun 2019 |
| 29836 | U. S. Energy Development Corporation | Fort Worth, TX 76164 | Oil & Gas Operator | Sep 2026 |
| 29837 | U. S. Operating, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2025 |
| 29838 | U.S. Capital Corp Of Am, Inc. | | Oil & Gas Operator | Aug 1998 |
| 29839 | U.S. Enercorp, LLC | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2004 |
| 29840 | U.S. Enercorp, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2019 |
| 29841 | U.S. Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 29842 | U.S. Oil Reclaimers, LLC | | Oil Operator | Jun 2023 |
| 29843 | U.S. Sovereign Oil And Gas, Inc. | Dallas, TX 75355 | Oil & Gas Operator | Sep 2026 |
| 29844 | U.S. Steel Mining Co., Inc. | | Gas Operator | Jan 2000 |
| 29845 | U.S. Steel Mining Co., LLC | | Gas Operator | Oct 2002 |
| 29846 | U.S.A. Plugging Company | Pearsall, TX 78061 | Oil & Gas Operator | Sep 2026 |
| 29847 | U1 Ranch Oil | Houston, TX 77269 | Oil & Gas Operator | Sep 2026 |
| 29848 | Uae Investco 1 (Estill), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2022 |
| 29849 | Uae Investco 2 (Lee), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2021 |
| 29850 | Ubetco, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2026 |
| 29851 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | May 2026 |
| 29852 | Uhc New Mexico Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2007 |
| 29853 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Sep 2026 |
| 29854 | Uhl Oil Co., Inc. | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 29855 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 29856 | Uinta Oil & Gas | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 1997 |
| 29857 | Uinta Wax Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |
| 29858 | Uintah Investors LLC | Vernal, UT 84078 | Oil & Gas Operator | Jul 2026 |
| 29859 | Ulatex Oil & Gas Inc. | Nocona, TX 76255 | Oil & Gas Operator | Dec 1998 |
| 29860 | Ullrich Sandy J | Haskell, OK 74436 | Oil Operator | Jun 2026 |
| 29861 | Ulrich, William J., Jr. & Connie K. | Elma, NY 14059 | Gas Operator | Dec 2025 |
| 29862 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Sep 2026 |
| 29863 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 29864 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 29865 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 29866 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 29867 | Ultramar Production Company | | Oil & Gas Operator | Dec 1991 |
| 29868 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | May 2026 |
| 29869 | Umad LLC | | Oil & Gas Operator | Feb 2010 |
| 29870 | Umberham Oil Company Inc | Oklahoma City, OK 73111 | Oil & Gas Operator | Jun 2026 |
| 29871 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 29872 | Umma Resources, LLC | Portland, TX 78374 | Gas Operator | Sep 2026 |
| 29873 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 29874 | Unbridled Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2026 |
| 29875 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 29876 | Underground Energy Inc. | | Oil & Gas Operator | Dec 2025 |
| 29877 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Jul 2026 |
| 29878 | Underwood Oil And Gas LLC | Chandler, OK 74834-1414 | Oil & Gas Operator | Jul 2026 |
| 29879 | Underwood, Donald D. Dba Mustang Oil Co | Salem, WV 26426 | Oil & Gas Operator | Dec 2020 |
| 29880 | Underwood, Jim | Graham, TX 76450 | Oil & Gas Operator | Mar 2018 |
| 29881 | Unger Well Drilling Corp | Dennison, OH 44621 | Oil & Gas Operator | Dec 1999 |
| 29882 | Uni Production Company, Inc. | | Oil & Gas Operator | Apr 1988 |
| 29883 | Unicon Producing Company | Houston, TX 75252 | Gas Operator | Mar 1994 |
| 29884 | Unicorn Drilling Inc | Cody, WY 82414 | Oil Operator | Dec 1998 |
| 29885 | Unicorn Energy, Inc. | Elgin, TX 78621 | Oil & Gas Operator | Sep 2026 |
| 29886 | Unicorn Oil & Gas Co Inc | Dorset, OH 44032 | Oil & Gas Operator | Dec 1993 |
| 29887 | Unifid Oil & Gas Corp. | | Oil & Gas Operator | Mar 1994 |
| 29888 | Unified Oil & Gas Corp. | Snyder, TX 79550 | Oil Operator | Sep 2026 |
| 29889 | Unioil | Denver, CO 80203 | Oil & Gas Operator | Dec 2010 |
| 29890 | Union Camp Corp | Dover, OH 44622 | Oil & Gas Operator | Dec 2002 |
| 29891 | Union City Boro Muni Auth Erie Cnty | Union City, PA 16438-1326 | Gas Operator | Dec 2024 |
| 29892 | Union Crude Company | Baytown, TX 77521 | Oil & Gas Operator | Apr 2018 |
| 29893 | Union Crude Operating Co. | Baytown, TX 77521 | Oil Operator | Aug 2003 |
| 29894 | Union Development Company Inc | | Oil & Gas Operator | Dec 1992 |
| 29895 | Union Diversified, Inc. | | Gas Operator | Dec 2008 |
| 29896 | Union Drilling &Management Inc | | Gas Operator | Feb 1991 |
| 29897 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 29898 | Union Gas Operating Company | Spring, TX 77391 | Oil & Gas Operator | Sep 2026 |
| 29899 | Union Oil Co | Danville, OH 43014 | Oil & Gas Operator | Dec 2014 |
| 29900 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |