| 4801 | Hardin Energy Co., Inc. | Bigfoot, TX 78005 | Oil Operator | Mar 2025 |
| 4802 | Hardin, W.V. Estate | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2002 |
| 4803 | Harding Company | Dallas, TX 75244 | Oil & Gas Operator | Jan 2015 |
| 4804 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 4805 | Harding Well Service Co. | Coahoma, TX 79511 | Oil & Gas Operator | Aug 2003 |
| 4806 | Hardrock Operating Company, Inc. | Fort Worth, TX 76161 | Oil & Gas Operator | Mar 2025 |
| 4807 | Hardrock Resources Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2025 |
| 4808 | Hardway Prod & Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Aug 2016 |
| 4809 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 4810 | Hardwick, Mark P. Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 1994 |
| 4811 | Hardwick, Ross H. Oil Company | Devine, TX 78016 | Oil & Gas Operator | Mar 2025 |
| 4812 | Hardy Oil & Gas USA Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1996 |
| 4813 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | Mar 2025 |
| 4814 | Hargis Exploration & Prod., Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1996 |
| 4815 | Haring Energy Company | Tuleta, TX 78162 | Oil & Gas Operator | Mar 2003 |
| 4816 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 4817 | Harkey Energy Inc. | Odessa, TX 79762 | Oil & Gas Operator | Feb 2020 |
| 4818 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | Mar 2025 |
| 4819 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 4820 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 4821 | Harmel And Shawver Oil LLC | Wichita Falls, TX 76310 | Oil Operator | Mar 2025 |
| 4822 | Harmon, C. E. Oil, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2019 |
| 4823 | Harmonia Petroleum Corporation | Missouri City, TX 77459 | Oil & Gas Operator | May 2017 |
| 4824 | Harmony Drilling Company, Inc. | Denver, CO 80222 | Oil & Gas Operator | Nov 2016 |
| 4825 | Harmony Exploration, Inc. | College Sta, TX 77842 | Oil & Gas Operator | Mar 2025 |
| 4826 | Harms, Vance N. | Talpa, TX 76882 | Oil & Gas Operator | Mar 2016 |
| 4827 | Harper Hefte, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 4828 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Nov 2024 |
| 4829 | Harper Production, LLC | Spearman, TX 79081 | Oil & Gas Operator | Mar 2025 |
| 4830 | Harper, Clint | Woodson, TX 76491 | Oil & Gas Operator | Mar 2025 |
| 4831 | Harper, Wayne | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 4832 | Harper, William E. | Woodson, TX 76491 | Oil & Gas Operator | Jul 2016 |
| 4833 | Harper, William E. Estate Of | Woodson, TX 76491 | Oil & Gas Operator | Mar 2025 |
| 4834 | Harrell Operating Inc | Graham, TX 76450 | Oil & Gas Operator | Sep 2005 |
| 4835 | Harrell Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Jun 2008 |
| 4836 | Harrell, Charles | Graham, TX 76450 | Oil & Gas Operator | Dec 2000 |
| 4837 | Harrier Holdings, LTD. | Burnet, TX 78611 | Oil Operator | Mar 2025 |
| 4838 | Harrigan Energy Partners, Inc. | Houston, TX 77058 | Oil & Gas Operator | Sep 2010 |
| 4839 | Harrigan Operating, LLC | Houston, TX 77258 | Oil & Gas Operator | Apr 2020 |
| 4840 | Harris Energy Partners Op, LLC | Fort Worth, TX 76116 | Oil Operator | Mar 2025 |
| 4841 | Harris Energy Services, LLC | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 4842 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 4843 | Harris, Jake, Trustee | Wichita Falls, TX 76301 | Oil & Gas Operator | Jun 2001 |
| 4844 | Harris, Sam E. | Albany, TX 76430 | Oil & Gas Operator | Aug 2003 |
| 4845 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 4846 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Dec 2024 |
| 4847 | Harrison, Dan J III&Bruce F Est | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 4848 | Harrison, Dan J. III&Bruce F. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 4849 | Harrison, Sam G. Oil, Inc. | Houston, TX 77019 | Oil & Gas Operator | Nov 2019 |
| 4850 | Hart & McFarland | Vivian, LA 71082 | Oil & Gas Operator | Mar 2025 |
| 4851 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | Mar 2025 |
| 4852 | Hartel, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Aug 1997 |
| 4853 | Harter, Ron | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 4854 | Hartoil Corporation | Post, TX 79356 | Oil & Gas Operator | Mar 2025 |
| 4855 | Harvard Petroleum Company, LLC | Roswell, NM 88202 | Oil & Gas Operator | Mar 2025 |
| 4856 | Harvard Petroleum Corporation | Roswell, NM 88201 | Oil & Gas Operator | Dec 2004 |
| 4857 | Harvest Operating Company, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 1997 |
| 4858 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Mar 2025 |
| 4859 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 4860 | Harvey, James W. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2008 |
| 4861 | Harvey, Mike W. Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Aug 2003 |
| 4862 | Harvey, Robert E., Jr. | Nixon, TX 78140 | Oil & Gas Operator | Oct 2003 |
| 4863 | Harvick Oil Co. | Albany, TX 76430 | Oil & Gas Operator | Feb 2009 |
| 4864 | Harvick, George R. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 4865 | Harwell Enterprises | Loveland, CO 80537 | Gas Operator | Nov 2019 |
| 4866 | Harwell Enterprises Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Jan 2005 |
| 4867 | Harwood Exploration, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 4868 | Haskit, Kendall | Kyle, TX 78640 | Oil & Gas Operator | Mar 2025 |
| 4869 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 4870 | Hastings, J. W. Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2010 |
| 4871 | Hat Creek Energy LLC | Denver, CO 80209 | Oil & Gas Operator | Jun 2019 |
| 4872 | Hat Oil & Gas, Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2002 |
| 4873 | Hatcher, Ray | Burkburnett, TX 76354 | Oil & Gas Operator | Jun 2002 |
| 4874 | Hatler Oil Company, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2000 |
| 4875 | Havens Oil Company | Early, TX 76803 | Oil & Gas Operator | Dec 2024 |
| 4876 | Haverkamp, Floyd | Muenster, TX 76252 | Oil & Gas Operator | Oct 2001 |
| 4877 | Havins Energy | Burkburnett, TX 76354 | Oil & Gas Operator | May 2006 |
| 4878 | Hawk Exploration And Production | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Oct 1995 |
| 4879 | Hawk Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 4880 | Hawk Petroleum, L L C | San Diego, TX 78384 | Oil & Gas Operator | Mar 2025 |
| 4881 | Hawk Well Service | Borger, TX 79007 | Oil & Gas Operator | Mar 2025 |
| 4882 | Hawk-Hill Operating Company, LLC | Plano, TX 75093 | Oil & Gas Operator | Jun 2009 |
| 4883 | Hawkbend LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 4884 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 4885 | Hawkeye Transmission Company | Dallas, TX 75244 | Oil & Gas Operator | Jun 2000 |
| 4886 | Hawkins Energy Corporation | Austin, TX 78711 | Oil & Gas Operator | Apr 1997 |
| 4887 | Hawkins Oil & Gas Company | Richardson, TX 75080 | Oil & Gas Operator | Mar 2025 |
| 4888 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 4889 | Hawkins Oil, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2024 |
| 4890 | Hawkins, B. O. | Aspermont, TX 79502 | Oil & Gas Operator | Mar 2025 |
| 4891 | Hawkins, G. A. | Graham, TX 76450 | Oil & Gas Operator | Dec 2013 |
| 4892 | Hawkwood Energy Operating, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 4893 | Hawn Bros. & Venus Oil Co. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 1995 |
| 4894 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 4895 | Hawn Brothers Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jan 2003 |
| 4896 | Hawthorn Energy Partners, LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 4897 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 4898 | Hay Creek Investments, L.L.C. | Santa Anna, TX 76878 | Oil Operator | Jul 2018 |
| 4899 | Hayabusa Energy USA, LLC | Pampa, TX 79065 | Oil & Gas Operator | Mar 2025 |
| 4900 | Hayes Oil & Gas Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2005 |