| 4801 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 4802 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 4803 | Union Texas Petroleum Corp. | Houston, TX 77252-2120 | Oil & Gas Operator | Dec 2014 |
| 4804 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2025 |
| 4805 | United Gas Pipe Line Co. | | Oil Operator | Aug 1993 |
| 4806 | United Investment Group | | Oil Operator | Nov 2004 |
| 4807 | United Operators, Inc. | | Oil Operator | Sep 1999 |
| 4808 | United Petroleum Corporation | Edgwater, CO 80214 | Oil & Gas Operator | May 1996 |
| 4809 | United Southern Resources Inc. | | Gas Operator | Nov 2013 |
| 4810 | United World Energy Corporation | | Oil & Gas Operator | Dec 2024 |
| 4811 | Universal Drilling Co., Inc. | Denver, CO 80203 | Oil & Gas Operator | Sep 2003 |
| 4812 | Universal Land | | Oil Operator | Dec 2024 |
| 4813 | Universal Oil Co. | | Oil Operator | Jan 2025 |
| 4814 | Universal Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 4815 | Universal Producers, Inc. | | Oil Operator | Jun 2001 |
| 4816 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 4817 | University Field Management LLC | | Oil Operator | Nov 2024 |
| 4818 | Unocal Exploration Corporation | | Oil & Gas Operator | May 1992 |
| 4819 | Upstream Exploration LLC | Metairie, LA 70002 | Oil & Gas Operator | Jan 2020 |
| 4820 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Apr 2025 |
| 4821 | Us Liquids Of La, LTD | | Oil Operator | Jul 2002 |
| 4822 | Us Oil & Gas Inc | Marietta, OH 45750 | Oil & Gas Operator | Feb 2025 |
| 4823 | Usoil Corporation | | Oil & Gas Operator | Nov 1998 |
| 4824 | V L Pittman PC & Producer, Inc | | Oil & Gas Operator | Jul 1989 |
| 4825 | V. E. Karnes | | Oil Operator | Jun 1989 |
| 4826 | V. H. Brumley | | Oil Operator | Jul 1994 |
| 4827 | V. Monta Currie, Jr. | | Oil Operator | Jun 2007 |
| 4828 | Vale Petroleum Corporation | Houston, TX 77042 | Gas Operator | Jan 1995 |
| 4829 | Valerius, Inc. & Zine, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jul 1994 |
| 4830 | Vamos Oil & Gas, LLC | Miami, FL 33129 | Oil & Gas Operator | Apr 2025 |
| 4831 | Van Operating, LTD. | Albany, TX 76430 | Oil & Gas Operator | Apr 2025 |
| 4832 | Van Zanten, Inc. | | Gas Operator | Jan 1990 |
| 4833 | Vanguard Environmental, LLC | | Oil Operator | Nov 2024 |
| 4834 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 4835 | Vanguard Petroleum Corp. | | Gas Operator | Jun 1986 |
| 4836 | Vantage Point Operating Co | Houston, TX 77057 | Oil & Gas Operator | Dec 2014 |
| 4837 | Vaquero Resources, LLC | Edmond, OK 73034 | Oil & Gas Operator | Jan 2025 |
| 4838 | Varco Oil | | Oil & Gas Operator | Apr 1991 |
| 4839 | Vast Oil Inc | Fullerton, CA 92832 | Oil & Gas Operator | Mar 2024 |
| 4840 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Dec 2024 |
| 4841 | Vaughn Petroleum, Inc. | Dallas, TX 75219 | Oil & Gas Operator | May 2004 |
| 4842 | Vector Energy Corporation | Houston, TX 77060 | Oil & Gas Operator | Apr 2025 |
| 4843 | Vector Minerals Corporation | Aurora, CO 80015 | Oil & Gas Operator | Feb 2025 |
| 4844 | Vega Oil & Gas MGMT., Inc. | | Oil & Gas Operator | Aug 1981 |
| 4845 | Velandera Energy Partners LLC | | Oil & Gas Operator | Nov 2024 |
| 4846 | Venado Petroleum Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 2012 |
| 4847 | Ventex Operating Corp. | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 4848 | Venture Oil & Gas, Inc. | Laurel, MS 39440 | Oil & Gas Operator | Feb 2025 |
| 4849 | Venture Oil Company Of Texas | | Oil Operator | Sep 1988 |
| 4850 | Ventures Oil & Gas Of La Inc. | | Oil & Gas Operator | Jun 1999 |
| 4851 | Venvirotek Of Louisiana, Inc. | | Oil Operator | Apr 2002 |
| 4852 | Verado Energy, Inc. | Allen, TX 75013 | Oil & Gas Operator | Apr 2025 |
| 4853 | Vermilion Bay Land Co. | | Oil & Gas Operator | Dec 1994 |
| 4854 | Vermilion Exploration, Inc. | | Oil & Gas Operator | Dec 1982 |
| 4855 | Vermilion Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2009 |
| 4856 | Vermillion Energy & Dev. Corp. | | Oil & Gas Operator | Jul 1991 |
| 4857 | Vern Wilson Energy Inc. | | Oil & Gas Operator | Dec 2011 |
| 4858 | Verna Petroleum Company | | Oil & Gas Operator | Jun 1992 |
| 4859 | Vernon Bradford | | Oil Operator | Apr 1992 |
| 4860 | Vernon E. Faulconer | | Oil & Gas Operator | Dec 1996 |
| 4861 | Vernon E. Faulconer, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 4862 | Verona Energy, Inc. | | Oil & Gas Operator | Nov 2024 |
| 4863 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 4864 | Vetra Exploration And Production LLC | | Oil & Gas Operator | Aug 2012 |
| 4865 | Vibe Resources LLC | | Oil & Gas Operator | Dec 2024 |
| 4866 | Victoria Land & Investment Co. | | Oil & Gas Operator | Jan 1985 |
| 4867 | Victory Financial Group, Inc. | Metairie, LA 70009 | Oil & Gas Operator | Sep 2002 |
| 4868 | Viking Oil Co. | | Oil & Gas Operator | Dec 1990 |
| 4869 | Viking Resources | | Oil & Gas Operator | Sep 1995 |
| 4870 | Vinbar Oil & Gas, LLC | | Oil & Gas Operator | Jan 2018 |
| 4871 | Vine Energy Operating LP | | Gas Operator | Oct 2021 |
| 4872 | Vine Oil & Gas LP | | Gas Operator | Apr 2021 |
| 4873 | Vintage Petroleum, Inc. | Houston, TX 77046 | Oil & Gas Operator | Jan 2025 |
| 4874 | Vinyard And Sons | | Oil & Gas Operator | Oct 2009 |
| 4875 | Virgil L. Pittman | | Oil & Gas Operator | Jun 1983 |
| 4876 | Virgin Offshore U.S.A., Inc. | | Oil & Gas Operator | Oct 2012 |
| 4877 | Virtex Petroleum Company, Inc. | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Jan 2008 |
| 4878 | Vision Natural Res-La, LLC | | Oil Operator | Dec 2024 |
| 4879 | Vista Corporation | | Oil & Gas Operator | Jan 2011 |
| 4880 | Vista Investments | | Gas Operator | Nov 1998 |
| 4881 | Vista Resources LLC | Teague, TX 75860 | Oil & Gas Operator | Apr 2025 |
| 4882 | Vistatex Energy LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2025 |
| 4883 | Vitol Resources Inc. Of Delaware | | Oil & Gas Operator | Jul 2016 |
| 4884 | Vivian Oil Partners, LLC | | Oil Operator | Jan 2025 |
| 4885 | Volvo Petroleum, Inc. | | Oil & Gas Operator | Jul 1984 |
| 4886 | Vonco Of Mississippi, Inc. | | Oil Operator | Jan 2025 |
| 4887 | Voyager Energy, LLC | | Oil & Gas Operator | Dec 2010 |
| 4888 | Vtex Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 4889 | W & C Oil & Gas | | Oil Operator | Feb 1996 |
| 4890 | W & K Oil Co. | | Oil & Gas Operator | Jun 1989 |
| 4891 | W & L Oil Co. | | Oil Operator | Aug 1995 |
| 4892 | W & T Offshore, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 4893 | W & T Oil Properties, Inc. | | Oil & Gas Operator | Nov 1989 |
| 4894 | W B Powers Production Serv. | | Oil Operator | Feb 1991 |
| 4895 | W D L Enterprises, Inc | | Oil & Gas Operator | Apr 1983 |
| 4896 | W M Smith | | Oil Operator | Jun 1989 |
| 4897 | W&S Energy LLC | Woodward, OK 73801 | Oil & Gas Operator | Sep 2022 |
| 4898 | W&W Oil Co | Denver City, TX 79323 | Oil Operator | Jun 2002 |
| 4899 | W. A. Moncrief | | Oil & Gas Operator | Jun 2010 |
| 4900 | W. A. Moncrief, Jr. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |