| 1801 | Gruss Petroleum | | Oil Operator | Jan 1986 |
| 1802 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 1803 | GS Oil & Gas Co. | New York, NY 10004 | Gas Operator | Jan 1989 |
| 1804 | Guardian Energy Cons | | Gas Operator | Sep 2009 |
| 1805 | Guardian Energy Consultants, Inc. | Tulsa, OK 74120 | Gas Operator | Sep 2009 |
| 1806 | Guinn Investments, Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2018 |
| 1807 | Guinotte Company LLC | Ottawa, KS 66067 | Oil Operator | Dec 2009 |
| 1808 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 1809 | Gulick Drilling , Inc. | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 1810 | Gumfory, Shawn | Iola, KS 66749 | Oil Operator | Jul 1998 |
| 1811 | Gunner Oil Company | Wichita, KS 67205 | Oil & Gas Operator | Sep 2025 |
| 1812 | Gus Jones Cable Tool Service, LLC | Elk City, KS 67344 | Oil Operator | Aug 2025 |
| 1813 | Gusher Oil | | Oil Operator | Jul 2004 |
| 1814 | Gustison Steven | | Oil Operator | Feb 1985 |
| 1815 | Guthrie Oil Co | | Oil Operator | Nov 1994 |
| 1816 | Guthrie Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 1817 | H & B Petroleum Corp. | Hutchinson, KS 67504 | Oil & Gas Operator | Sep 2025 |
| 1818 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 1819 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Sep 2025 |
| 1820 | H & D Exploration LLC | Hoisington, KS 67544 | Oil & Gas Operator | Sep 2025 |
| 1821 | H & H Oil Compan | | Oil & Gas Operator | Aug 1995 |
| 1822 | H & H Oil Company | | Oil & Gas Operator | Sep 2025 |
| 1823 | H & H Oil Company, A General Partnership | Plainville, KS 67663 | Oil Operator | Feb 1997 |
| 1824 | H & H Oil, LLC | Lincolnville, KS 66858 | Oil Operator | Sep 2025 |
| 1825 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 1826 | H & H Production, Inc. | Topeka, KS 66614 | Oil Operator | May 1997 |
| 1827 | H & H Supply Inc | | Gas Operator | Mar 1985 |
| 1828 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 1829 | H & L Oprerating Company LLP | Amarillo, TX 79114 | Oil & Gas Operator | Nov 2019 |
| 1830 | H & M Packers Serv. L.L.C. | | Oil Operator | Dec 2019 |
| 1831 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jun 2025 |
| 1832 | H & M Productions L.L.C. | Overland Park, KS 66210 | Oil Operator | May 1998 |
| 1833 | H & R Expl & Production Inc | Sidney, NE 69162 | Oil Operator | May 2007 |
| 1834 | H & R Exploratio | | Oil Operator | Feb 1992 |
| 1835 | H & S Oil Co., LLC | Cherryvale, KS 67335 | Oil Operator | Oct 2024 |
| 1836 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 1837 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 1838 | H A L Petroleum | | Oil Operator | Oct 1987 |
| 1839 | H-30 Incorporate | | Oil & Gas Operator | Nov 1990 |
| 1840 | H-30, Inc. | Wichita, KS 67202 | Gas Operator | Oct 2006 |
| 1841 | H-40 Drilling, Inc. | Medicine Lodge, KS 67104 | Gas Operator | Sep 2025 |
| 1842 | H-5 Service | Plainville, KS 67663 | Oil Operator | May 1989 |
| 1843 | H-D Oilfield Service, Inc. | Bazine, KS 67516 | Oil Operator | Sep 2025 |
| 1844 | H. H. Blair Oil Company, Inc. | Atlanta, KS 67008 | Oil Operator | Dec 2009 |
| 1845 | H. I., Inc. | Liberal, KS 67901 | Oil & Gas Operator | Feb 2012 |
| 1846 | H.I.T. Resources, Inc. | Arkansas City, KS 67005 | Oil Operator | Jan 2007 |
| 1847 | H3 Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 1848 | Haack Operating Company | Tulsa, OK 74137 | Oil Operator | Jul 2025 |
| 1849 | Haas John L | | Oil Operator | Dec 2009 |
| 1850 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Sep 2025 |
| 1851 | Haas, Mark L. | Kansas City, MO 67112 | Oil Operator | Feb 2013 |
| 1852 | Habit Petroleum | | Oil Operator | Dec 2009 |
| 1853 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1854 | Hacker, Jack | Coats, KS 67028 | Oil & Gas Operator | Jul 2025 |
| 1855 | Hackley Okla Inc | | Oil & Gas Operator | Aug 1992 |
| 1856 | Had-A-Call Oil | | Oil Operator | Feb 2017 |
| 1857 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Nov 2025 |
| 1858 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 1859 | Hadson Petroleum | | Oil Operator | Sep 1988 |
| 1860 | Hafer Run Enterprise | Independence, KS 67301 | Oil Operator | Oct 1997 |
| 1861 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Sep 2025 |
| 1862 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Sep 2025 |
| 1863 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 1864 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Feb 2026 |
| 1865 | Hall Oil Company | Humboldt, KS 66748 | Oil Operator | Nov 2009 |
| 1866 | Hall Richard A | | Oil Operator | Sep 1993 |
| 1867 | Hall, J.J. Operating Co., Inc. | Lakewood, CO 80215 | Oil Operator | Jan 2005 |
| 1868 | Hall, Michael Wayne | Toronto, KS 66777 | Oil Operator | Dec 2009 |
| 1869 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 1870 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 1871 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 1872 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 1873 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 1874 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 1875 | Hamilton Brother | | Gas Operator | May 1993 |
| 1876 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 1877 | Hamm N R Contrac | | Oil & Gas Operator | Jun 1989 |
| 1878 | Hammer Maclean Etal | Leon, KS 67074 | Oil Operator | Dec 2019 |
| 1879 | Hammer Oil Compa | | Oil Operator | Oct 1985 |
| 1880 | Hammerschmidt Wi | | Oil Operator | Sep 1991 |
| 1881 | Hammerschmidt, Leo | Plainville, KS 67663 | Oil Operator | Aug 2000 |
| 1882 | Hammerschmidt, William E | Plainville, KS 67663 | Oil Operator | Sep 2025 |
| 1883 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 1884 | Hamp Oil - Pace | | Oil & Gas Operator | Apr 1994 |
| 1885 | Hand Oil Co. | Chanute, KS 66720 | Oil Operator | Nov 2000 |
| 1886 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 1887 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 1888 | Har-Ken Agent, Ok | Owensboro, KY 42302 | Oil Operator | Sep 2025 |
| 1889 | Harbacek Florence | Holyrood, KS 67450 | Oil Operator | Aug 2002 |
| 1890 | Harcon Energy, LLC | Le Roy, KS 66857 | Oil Operator | Dec 2009 |
| 1891 | Hardin Oil Co. | | Oil Operator | Dec 2019 |
| 1892 | Harlo Oil Compan | | Oil Operator | Dec 1994 |
| 1893 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 1894 | Harms Petroleum | | Oil & Gas Operator | May 1991 |
| 1895 | Harms, H. Allan Petroleum Co., Inc. | Great Bend, KS 67530 | Oil Operator | Apr 1999 |
| 1896 | Harold Production | Castle Rock, CO 80104 | Gas Operator | Mar 1999 |
| 1897 | Harper Oil And Gas, LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 1898 | Harper Oil Co. | Denver, CO 80217 | Oil & Gas Operator | Sep 2025 |
| 1899 | Harper Prod Comp | | Gas Operator | May 1991 |
| 1900 | Harris Oil & Gas | | Oil & Gas Operator | Jul 1995 |