| 29801 | Ubetco, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Apr 2026 |
| 29802 | Uehlin LLC | Oberlin, KS 67749 | Oil Operator | Jul 2025 |
| 29803 | Uhc New Mexico Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2007 |
| 29804 | Uhc Petroleum Corporation | Rocksprings, TX 78880 | Oil & Gas Operator | Apr 2026 |
| 29805 | Uhl Oil Co., Inc. | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 29806 | Uhls, Jimmie J. | Sedan, KS 67361 | Oil Operator | Sep 2019 |
| 29807 | Uinta Oil & Gas | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 1997 |
| 29808 | Uinta Wax Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2026 |
| 29809 | Uintah Investors LLC | Vernal, UT 84078 | Oil & Gas Operator | Feb 2026 |
| 29810 | Ulatex Oil & Gas Inc. | Nocona, TX 76255 | Oil & Gas Operator | Dec 1998 |
| 29811 | Ulrich, William J., Jr. & Connie K. | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 29812 | Ultra Oil & Gas, Inc. | Centerton, AR 72719 | Oil & Gas Operator | Apr 2026 |
| 29813 | Ultra Petroleum (U.S.A.), Inc. | Granbury, TX 76048 | Oil & Gas Operator | Sep 2003 |
| 29814 | Ultra Production Company, LLC | Cedar Bluff, VA 24609 | Gas Operator | Oct 2014 |
| 29815 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 29816 | Ultramar Oil & Gas LTD | Houston, TX 77060 | Oil & Gas Operator | Jul 1995 |
| 29817 | Ultramar Production Company | | Oil & Gas Operator | Dec 1991 |
| 29818 | Ulysses, City Of | Ulysses, KS 67880 | Gas Operator | Dec 2025 |
| 29819 | Umad LLC | | Oil & Gas Operator | Feb 2010 |
| 29820 | Umberham Oil Company Inc | Oklahoma City, OK 73151-4000 | Oil & Gas Operator | Jan 2026 |
| 29821 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 29822 | Umma Resources, LLC | Portland, TX 78374 | Gas Operator | Apr 2026 |
| 29823 | Ummel'S Tank Ser | | Oil Operator | Sep 1994 |
| 29824 | Unbridled Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 29825 | Unc Texas Incorp | | Gas Operator | May 1987 |
| 29826 | Underground Energy Inc. | | Oil & Gas Operator | Dec 2025 |
| 29827 | Underwood Oil & Gas | Casper, WY 82602 | Oil & Gas Operator | Feb 2026 |
| 29828 | Underwood Oil And Gas LLC | Chandler, OK 74834-1414 | Oil & Gas Operator | Jan 2026 |
| 29829 | Underwood, Donald D. Dba Mustang Oil Co | Salem, WV 26426 | Oil & Gas Operator | Dec 2020 |
| 29830 | Underwood, Jim | Graham, TX 76450 | Oil & Gas Operator | Mar 2018 |
| 29831 | Unger Well Drilling Corp | Dennison, OH 44621 | Oil & Gas Operator | Dec 1999 |
| 29832 | Uni Production Company, Inc. | | Oil & Gas Operator | Apr 1988 |
| 29833 | Unicon Producing Company | Houston, TX 75252 | Gas Operator | Mar 1994 |
| 29834 | Unicorn Drilling Inc | Cody, WY 82414 | Oil Operator | Dec 1998 |
| 29835 | Unicorn Energy, Inc. | Elgin, TX 78621 | Oil & Gas Operator | Apr 2026 |
| 29836 | Unicorn Oil & Gas Co Inc | Dorset, OH 44032 | Oil & Gas Operator | Dec 1993 |
| 29837 | Unifid Oil & Gas Corp. | | Oil & Gas Operator | Mar 1994 |
| 29838 | Unified Oil & Gas Corp. | Snyder, TX 79550 | Oil Operator | Apr 2026 |
| 29839 | Unioil | Denver, CO 80203 | Oil & Gas Operator | Dec 2010 |
| 29840 | Union Camp Corp | Dover, OH 44622 | Oil & Gas Operator | Dec 2002 |
| 29841 | Union City Boro Muni Auth Erie Cnty | Union City, PA 16438-1326 | Gas Operator | Dec 2024 |
| 29842 | Union Crude Company | Baytown, TX 77521 | Oil & Gas Operator | Apr 2018 |
| 29843 | Union Crude Operating Co. | Baytown, TX 77521 | Oil Operator | Aug 2003 |
| 29844 | Union Development Company Inc | | Oil & Gas Operator | Dec 1992 |
| 29845 | Union Diversified, Inc. | | Gas Operator | Dec 2008 |
| 29846 | Union Drilling &Management Inc | | Gas Operator | Feb 1991 |
| 29847 | Union Expl. Partners, LTD. | | Oil & Gas Operator | Aug 1990 |
| 29848 | Union Gas Operating Company | Spring, TX 77391 | Oil & Gas Operator | Apr 2026 |
| 29849 | Union Oil Co | Danville, OH 43014 | Oil & Gas Operator | Dec 2014 |
| 29850 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 29851 | Union Operating Corp | Lakewoord, CO 80215 | Oil Operator | Dec 2023 |
| 29852 | Union Pacific Austin Chalk Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 29853 | Union Pacific Re | | Oil & Gas Operator | Dec 1996 |
| 29854 | Union Pacific Resour | | Oil & Gas Operator | Apr 2002 |
| 29855 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Jan 2001 |
| 29856 | Union Petro Inc | Uniontown, KY 42461 | Oil Operator | Dec 2024 |
| 29857 | Union Petrochemical | | Oil & Gas Operator | Dec 1982 |
| 29858 | Union Producing Co. | | Gas Operator | Dec 1992 |
| 29859 | Union Royalty, Inc. | Midland, TX 79706 | Oil & Gas Operator | Jul 2014 |
| 29860 | Union Seaboard Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 29861 | Union Springs Central School District | Union Springs, NY 13160 | Gas Operator | Dec 2024 |
| 29862 | Union Texas Petroleum | Houston, TX 77252 | Oil & Gas Operator | Oct 1991 |
| 29863 | Union Texas Petroleum Corp | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 29864 | Union Valley Petroleum Corp | Enid, OK 73701 | Oil & Gas Operator | Jan 2026 |
| 29865 | Unionville Explo | | Oil Operator | Jul 1984 |
| 29866 | Unit Drilling & Exploration Co | Tulsa, OK 74132-5300 | Oil & Gas Operator | Dec 2025 |
| 29867 | Unit Manager, Citronelle Unit | | Oil & Gas Operator | Sep 2001 |
| 29868 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2026 |
| 29869 | United Company | Lubbock, TX 79408 | Oil & Gas Operator | Jun 1995 |
| 29870 | United Energy & Expl Inc | Ada, OK 74821-2449 | Oil & Gas Operator | Dec 2025 |
| 29871 | United Energy & Exploration LLC | Ada, OK 74821 | Oil & Gas Operator | Jan 2026 |
| 29872 | United Energy Corporation | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 29873 | United Energy Develop Co LTD | Bartlesville, OK 74003 | Oil Operator | Mar 2004 |
| 29874 | United Energy Operating, LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2026 |
| 29875 | United Energy Partners, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 29876 | United Energy, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2002 |
| 29877 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 29878 | United Investment Group | | Oil Operator | Nov 2004 |
| 29879 | United Meridian | | Oil Operator | Dec 1992 |
| 29880 | United Natural Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2020 |
| 29881 | United Natural Resources Corp | | Oil Operator | Jan 1986 |
| 29882 | United O&G/Atlee Miller | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1985 |
| 29883 | United Oil & Gas | | Oil Operator | Feb 1988 |
| 29884 | United Oil & Minerals L. P. | Austin, TX 78746 | Oil & Gas Operator | Jun 2003 |
| 29885 | United Oil & Minerals, Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2001 |
| 29886 | United Oil & Shale LLC | Woodward, OK 73801 | Oil & Gas Operator | Apr 2026 |
| 29887 | United Oil Corporation | Denver, CO 80202-3813 | Oil & Gas Operator | Dec 2025 |
| 29888 | United Operating Company | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 29889 | United Operating, LLC *** | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 29890 | United Operators, Inc. | | Oil Operator | Sep 1999 |
| 29891 | United Petro LTD. | | Oil & Gas Operator | Dec 2018 |
| 29892 | United Petroleum | | Oil Operator | Mar 1986 |
| 29893 | United Petroleum & Gas, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 29894 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 |
| 29895 | United Petroleum Technologies | Hondo, TX 78861 | Oil & Gas Operator | Aug 2001 |
| 29896 | United Primary Resources Inc | Milton, WA 98354-9361 | Oil & Gas Operator | Feb 2016 |
| 29897 | United Producers Inc | Broken Arrow, OK 74012-8247 | Oil & Gas Operator | Mar 2020 |
| 29898 | United Producing Co Inc | | Oil & Gas Operator | May 1961 |
| 29899 | United Production Company LLC | Edmond, OK 73003 | Oil & Gas Operator | Jan 2026 |
| 29900 | United Reserve G | | Oil Operator | Aug 1987 |