| 1801 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Apr 2025 |
| 1802 | Haas John L | | Oil Operator | Dec 2009 |
| 1803 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Jun 2025 |
| 1804 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 1805 | Habit Petroleum | | Oil Operator | Dec 2009 |
| 1806 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 1807 | Hacker, Jack | Coats, KS 67028 | Oil & Gas Operator | Jun 2025 |
| 1808 | Hackley Okla Inc | | Oil & Gas Operator | Aug 1992 |
| 1809 | Had-A-Call Oil | | Oil Operator | Feb 2017 |
| 1810 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Sep 2025 |
| 1811 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 1812 | Hadson Petroleum | | Oil Operator | Sep 1988 |
| 1813 | Hafer Run Enterprise | Independence, KS 67301 | Oil Operator | Oct 1997 |
| 1814 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Jun 2025 |
| 1815 | Haffner Poor Farms, LLC | Hoxie, KS 67740 | Oil Operator | May 2025 |
| 1816 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Jun 2025 |
| 1817 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 1818 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 1819 | Hall Oil Company | Humboldt, KS 66748 | Oil Operator | Nov 2009 |
| 1820 | Hall Richard A | | Oil Operator | Sep 1993 |
| 1821 | Hall, J.J. Operating Co., Inc. | Lakewood, CO 80215 | Oil Operator | Jan 2005 |
| 1822 | Hall, Michael Wayne | Toronto, KS 66777 | Oil Operator | Dec 2009 |
| 1823 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 1824 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 1825 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 1826 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 1827 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 1828 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 1829 | Hamilton Brother | | Gas Operator | May 1993 |
| 1830 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 1831 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 1832 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 1833 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 1834 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 1835 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 1836 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Jun 2025 |
| 1837 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 1838 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 1839 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 1840 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 1841 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 1842 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Jun 2025 |
| 1843 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 1844 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 1845 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 1846 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 1847 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 1848 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 1849 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 1850 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Jun 2025 |
| 1851 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Jun 2025 |
| 1852 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 1853 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 1854 | Harris, David | Toronto, KS 66777 | Oil Operator | Apr 2025 |
| 1855 | Harrison Oil | Lindsay, OK 73052 | Oil & Gas Operator | Nov 2014 |
| 1856 | Harrison, Mark V. | Madison, KS 66860 | Oil Operator | Jul 1995 |
| 1857 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 1858 | Hart, Nick And Connie | Paola, KS 66071 | Oil Operator | May 2025 |
| 1859 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 1860 | Hartman W L Trus | | Oil Operator | Jun 1992 |
| 1861 | Harvest Energy Company | Englewood, CO 80110 | Oil & Gas Operator | Jun 1997 |
| 1862 | Hasada Industrie | | Oil & Gas Operator | Jul 1995 |
| 1863 | Hat Creek Cattle Company, A General Partnership | Paola, KS 66071 | Oil Operator | Aug 2016 |
| 1864 | Hat Production LLC | Mound City, KS 66056 | Oil Operator | May 2025 |
| 1865 | Haul-Pac, Inc. | Hiawatha, KS 66434 | Oil Operator | May 2025 |
| 1866 | Haven Oil & Gas | Hutchinson, KS 67504 | Oil & Gas Operator | Mar 2009 |
| 1867 | Hawkeye Oil | | Oil & Gas Operator | Jun 2007 |
| 1868 | Hawkins Oil & Ga | | Oil & Gas Operator | Jun 1995 |
| 1869 | Hawkins Oil & Gas Company | Richardson, TX 75080 | Oil & Gas Operator | Dec 2025 |
| 1870 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 1871 | Hawkins Oil, L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 1872 | Hawkins, James F. | Tulsa, OK 74103 | Oil Operator | Dec 2019 |
| 1873 | Hawn Petroleum I | | Oil Operator | Jun 1989 |
| 1874 | Hayden Operating | | Oil & Gas Operator | Jun 2025 |
| 1875 | Hayes Oil & Gas LLC | Attica, KS 67009 | Oil & Gas Operator | Jun 2025 |
| 1876 | Hayes Well Servi | | Oil & Gas Operator | Feb 1992 |
| 1877 | Haynie Robert L | | Gas Operator | Jan 2004 |
| 1878 | Hays Oil Field S | | Oil Operator | Nov 1988 |
| 1879 | Hazen, Paul D. | Great Bend, KS 67530 | Oil Operator | Nov 1990 |
| 1880 | Hazen, Ty Anthony | Lyons, KS 67554 | Oil Operator | Jun 2025 |
| 1881 | HB Energy LLC | Wellsville, KS 66092 | Oil Operator | Jun 2025 |
| 1882 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 1883 | HD Well Services LLC | Wellsville, KS 66092 | Oil Operator | Jun 2025 |
| 1884 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Jun 2025 |
| 1885 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 1886 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 1887 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 1888 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 1889 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 1890 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 1891 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 1892 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 1893 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 1894 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 1895 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 1896 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 1897 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 1898 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Jul 2025 |
| 1899 | Helm Energy Company | Tulsa, OK 74133 | Oil Operator | Jun 2025 |
| 1900 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |