| 1901 | Hodges & Hodges Oil Venture | Gallup, NM 87301 | Oil Operator | May 1999 |
| 1902 | Hodges Oil | | Oil Operator | Jan 2026 |
| 1903 | Hodges, Dennis D. And Peggy D. | Reading, KS 66868 | Oil Operator | Feb 2026 |
| 1904 | Hoehn Oil | Wellsville, KS 66092 | Oil Operator | Oct 1998 |
| 1905 | Hoehn Oil LLC | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 1906 | Hoener Ross Inco | | Oil Operator | Dec 1991 |
| 1907 | Hoener, Ross | Iuka, KS 67066 | Oil & Gas Operator | Feb 2026 |
| 1908 | Hoepker, Larry | Humboldt, KS 66748 | Oil Operator | Dec 2025 |
| 1909 | Hoff Oil & Gas | | Oil Operator | May 2013 |
| 1910 | Hoffman Oil, Inc. | Claflin, KS 67525 | Oil Operator | Jan 2026 |
| 1911 | Hoffman Petroleu | | Oil Operator | Sep 1989 |
| 1912 | Hoffman Petroleum, Inc. | Littleton, CO 80120 | Oil Operator | Sep 1996 |
| 1913 | Hoffman Resources LLC | Hoisington, KS 67544 | Oil & Gas Operator | Feb 2026 |
| 1914 | Hoffman, Brian | Claflin, KS 67525 | Oil Operator | Feb 2026 |
| 1915 | Hoffman, Myrle F. | Denver, CO 80202 | Oil Operator | Dec 1986 |
| 1916 | Hogoboom Al Oilf | | Oil Operator | Oct 1990 |
| 1917 | Holcomb Oil Comp | | Oil Operator | Sep 1991 |
| 1918 | Holland Assoc | | Oil Operator | Sep 1987 |
| 1919 | Holt IVan | | Oil Operator | Mar 1989 |
| 1920 | Holt IVan Leroy | | Oil & Gas Operator | Jan 1994 |
| 1921 | Holt Oil & Gas C | | Oil Operator | Sep 1984 |
| 1922 | Holt, Carol | Independence, KS 67301 | Oil Operator | Jul 2025 |
| 1923 | Holt, Roger | Cherryvale, KS 67335 | Gas Operator | Mar 2003 |
| 1924 | Holtom, Bill, A General Partnership | Saint Paul, KS 66771 | Oil Operator | Nov 2025 |
| 1925 | Holton Brothers | Canton, KS 67428 | Oil Operator | Apr 1990 |
| 1926 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 1927 | Hon R J Oil & Ga | | Oil Operator | Nov 1990 |
| 1928 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 1929 | Honey Oil Co | Wichita, KS 67226 | Oil & Gas Operator | Mar 2009 |
| 1930 | Honey Well, LLC | Lenexa, KS 66219 | Oil Operator | Jan 2026 |
| 1931 | Hoover Noble C | | Oil Operator | Nov 1992 |
| 1932 | Hope Company, LLC | Longmont, CO 80502 | Gas Operator | Feb 2012 |
| 1933 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2026 |
| 1934 | Hoppe Oil & Gas | | Oil Operator | Nov 1992 |
| 1935 | Hoppe Oil & Gas Co., Inc. | Wichita, KS 67202 | Oil Operator | Jul 1998 |
| 1936 | Hopper Oil Co., Inc. | Winfield, KS 67156 | Oil Operator | Feb 2026 |
| 1937 | Hopper Oil Compa | | Oil Operator | Sep 1988 |
| 1938 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 1939 | Horizontal Development & Production Inc | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2002 |
| 1940 | Horseshoe Operating Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 1941 | Horst Oil, LLC | Pittsburg, MO 65724 | Oil Operator | Dec 2009 |
| 1942 | Horton Oil Company | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 1943 | Horton, Jack | Independence, KS 67301 | Oil & Gas Operator | Aug 2015 |
| 1944 | Horton, John | Sedan, KS 67361 | Oil & Gas Operator | Feb 2026 |
| 1945 | House, Dustin | Shawnee, KS 66218 | Oil Operator | Jan 2026 |
| 1946 | Housel John R Jr | | Oil Operator | Oct 1994 |
| 1947 | Housel, Robert E. | Cherryvale, KS 67335 | Oil & Gas Operator | Dec 2003 |
| 1948 | Houston Hydrolan | | Oil Operator | Jul 1984 |
| 1949 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Jun 2026 |
| 1950 | Howell Oil Compa | | Oil & Gas Operator | Aug 1995 |
| 1951 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Feb 2026 |
| 1952 | Hrbek, R. L. | Merino, CO 80741 | Oil & Gas Operator | Jan 2024 |
| 1953 | HRL Oilfields In | | Oil Operator | Jun 1998 |
| 1954 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 1955 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 1956 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jun 2026 |
| 1957 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 1958 | Huber Oil Company, A General Partnership | Madison, KS 66860 | Oil & Gas Operator | Feb 2026 |
| 1959 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |
| 1960 | Hughes Drilling Co Inc | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 1961 | Hughes Drilling Co, A General Partnership | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 1962 | Hughes Services, LLC | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 1963 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 1964 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 1965 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 1966 | Humerickhouse Oil, LLC | Ottawa, KS 66067 | Oil Operator | Feb 2026 |
| 1967 | Humerickhouse, Donald L. | Ottawa, KS 66067 | Oil Operator | Dec 2009 |
| 1968 | Hummingbird Oil, LLC | Sedan, KS 67361 | Oil Operator | Feb 2026 |
| 1969 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2026 |
| 1970 | Hunt Oil, LLC | Garnett, KS 66032 | Oil Operator | Nov 2025 |
| 1971 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 1972 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 1973 | Hupfer Operating, Inc. | Shawnee, KS 66203 | Oil & Gas Operator | Dec 2019 |
| 1974 | Husain, Mrs. Shahnaz | Tulsa, OK 74136 | Oil Operator | Nov 1996 |
| 1975 | Hutchinson Oil C | | Oil & Gas Operator | May 1995 |
| 1976 | Hutchinson Oil Co. | | Oil & Gas Operator | Feb 2026 |
| 1977 | Hutchison Jay Oi | | Oil Operator | Sep 1991 |
| 1978 | Hutton Charles N | | Oil Operator | Dec 1994 |
| 1979 | Hutton, Charles N., SR. | Iola, KS 66749 | Oil Operator | Nov 2007 |
| 1980 | Hyde-Marrs, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1997 |
| 1981 | I & F Oil And Farm | | Oil & Gas Operator | Dec 2009 |
| 1982 | I & M Oil Production, LLC | Overland Park, KS 66209 | Oil & Gas Operator | Nov 2019 |
| 1983 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Feb 2026 |
| 1984 | Iantha Resources LLC | Garnett, KS 66032 | Oil Operator | Dec 2019 |
| 1985 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Feb 2026 |
| 1986 | Iep Kansas Gas, LLC | Burlington, CO 80807 | Oil & Gas Operator | Mar 2026 |
| 1987 | Igwt, Inc. | Rose Hill, KS 67133 | Oil & Gas Operator | Feb 2026 |
| 1988 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Mar 2026 |
| 1989 | Imperator Investments LLC | Shawnee, KS 66217 | Oil Operator | Aug 2024 |
| 1990 | Imperial American Oil Corporation | Wichita, KS 67205 | Oil Operator | Dec 2009 |
| 1991 | Imperial Oil & G | | Gas Operator | Jan 1990 |
| 1992 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 1993 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 1994 | Imperial Oil Properties, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2006 |
| 1995 | Impetro Nonop LLC | | Oil Operator | Feb 2026 |
| 1996 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 1997 | Incline Reserves | | Oil Operator | Apr 1988 |
| 1998 | Independence Energy LLC | | Oil Operator | Feb 2026 |
| 1999 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jun 2026 |
| 2000 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |