| 1801 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 1802 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 1803 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 1804 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | May 2026 |
| 1805 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 1806 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 1807 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 1808 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 1809 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 1810 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 1811 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 1812 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | May 2026 |
| 1813 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | May 2026 |
| 1814 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 1815 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 1816 | Harris, David | Toronto, KS 66777 | Oil Operator | May 2026 |
| 1817 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 1818 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 1819 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | May 2026 |
| 1820 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 1821 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 1822 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 1823 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 1824 | Hat Creek Cattle Company, A General Partnership | Paola, KS 66071 | Oil Operator | Aug 2016 |
| 1825 | Hat Production LLC | Mound City, KS 66056 | Oil Operator | Apr 2026 |
| 1826 | Haul-Pac, Inc. | Hiawatha, KS 66434 | Oil Operator | May 2026 |
| 1827 | Haven Oil & Gas | Hutchinson, KS 67504 | Oil & Gas Operator | Mar 2009 |
| 1828 | Hawkeye Oil | | Oil & Gas Operator | Jun 2007 |
| 1829 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 1830 | Hawkins Oil & Gas Company | Richardson, TX 75080 | Oil & Gas Operator | Sep 2026 |
| 1831 | Hawkins Oil & Gas, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 1832 | Hawkins Oil, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 1833 | Hawkins, James F. | Tulsa, OK 74103 | Oil Operator | Dec 2019 |
| 1834 | Hawn Petroleum I | | Oil Operator | Jun 1989 |
| 1835 | Hayden Operating | | Oil & Gas Operator | May 2026 |
| 1836 | Hayes Oil & Gas LLC | Attica, KS 67009 | Oil & Gas Operator | May 2026 |
| 1837 | Haynie Robert L | | Gas Operator | Jan 2004 |
| 1838 | Hays Oil Field S | | Oil Operator | Nov 1988 |
| 1839 | Hazen, Paul D. | Great Bend, KS 67530 | Oil Operator | Nov 1990 |
| 1840 | Hazen, Ty Anthony | Lyons, KS 67554 | Oil Operator | May 2026 |
| 1841 | HB Energy LLC | Wellsville, KS 66092 | Oil Operator | May 2026 |
| 1842 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 1843 | HD Well Services LLC | Wellsville, KS 66092 | Oil Operator | Apr 2026 |
| 1844 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Oct 2025 |
| 1845 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 1846 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 1847 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 1848 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 1849 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 1850 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 1851 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 1852 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 1853 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 1854 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 1855 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 1856 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 1857 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 1858 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Jun 2026 |
| 1859 | Helm Energy Company | Tulsa, OK 74133 | Oil Operator | May 2026 |
| 1860 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 1861 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | May 2026 |
| 1862 | Helsel, Allan J | South Haven, KS 67140 | Oil Operator | Apr 2026 |
| 1863 | Hembree Oil Production, LLC | Great Bend, KS 67530 | Oil Operator | May 2026 |
| 1864 | Hembree Robert F | | Oil Operator | Dec 2009 |
| 1865 | Henderson, Chris | Pawhuska, OK 74056 | Oil Operator | Dec 2009 |
| 1866 | Hennessy Oil Com | | Oil Operator | Mar 1991 |
| 1867 | Hensley Oil Company LLC | Arkansas City, KS 67005 | Oil Operator | May 2026 |
| 1868 | Hensley, Cloide J. & Hazel M. | Arkansas City, KS 67005 | Oil Operator | Sep 2001 |
| 1869 | Heritage Oil L.L.C. | Hays, KS 67601 | Oil Operator | May 2026 |
| 1870 | Herman Krug - Oil Operations | | Oil Operator | May 2026 |
| 1871 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | May 2026 |
| 1872 | Herman Lang Oil And Gas Co. | | Oil & Gas Operator | Dec 1992 |
| 1873 | Hermreck Oil Com | | Oil & Gas Operator | Aug 1996 |
| 1874 | Hermreck Oil Company | | Oil Operator | Oct 2025 |
| 1875 | Hertel Oil Company | | Oil Operator | Jan 2026 |
| 1876 | Hertel Oil Company LLC | Hays, KS 67601 | Oil Operator | May 2026 |
| 1877 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | May 2026 |
| 1878 | Hesse Petroleum Co.,L.L.C. | Wichita, KS 67208 | Oil & Gas Operator | May 2026 |
| 1879 | Hessert Edward C | | Oil & Gas Operator | Sep 1993 |
| 1880 | Hessert Loc Inc | Carl Junction, MO 64834 | Oil Operator | Dec 2009 |
| 1881 | Hett Oil & Gas, LLC | Lincolnville, KS 66858 | Oil & Gas Operator | Apr 2026 |
| 1882 | Hewitt Energy Group Inc | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 1883 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | May 2026 |
| 1884 | HGB Oil Company | Denver, CO 80224 | Oil Operator | Mar 2006 |
| 1885 | Hi-Kat Petroleum | | Oil Operator | Mar 1990 |
| 1886 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 1887 | Hibernian Compan | | Oil & Gas Operator | Feb 1991 |
| 1888 | Hicks Exploration, LLC | Dover, OK 73734 | Gas Operator | Oct 2024 |
| 1889 | Hiebert & Wedel | | Oil & Gas Operator | May 1995 |
| 1890 | Hiebert, D. O. Lewis | McPherson, KS 67460 | Oil Operator | Feb 1999 |
| 1891 | Higginbottom Engineering, Inc. | Liberal, KS 67905 | Oil & Gas Operator | May 2026 |
| 1892 | Higgins Oil & Ga | | Oil Operator | Apr 1992 |
| 1893 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 1894 | High Plains Oil | | Oil Operator | Jun 1989 |
| 1895 | High Plains Production, LLC | Murray, KY 42071 | Oil & Gas Operator | Dec 2024 |
| 1896 | Hill Oil And Gas Co., Inc. | Overland Park, KS 66213 | Oil Operator | Mar 2020 |
| 1897 | Hillary Oil Comp | | Oil & Gas Operator | Apr 1991 |
| 1898 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 1899 | Hillenburg Oil Co., A General Partnership | Broken Arrow, OK 74011 | Oil Operator | May 2026 |
| 1900 | Hilliker Oil Com | | Oil Operator | Jul 1984 |