| 1901 | Horizontal Development & Production Inc | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2002 |
| 1902 | Horseshoe Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 1903 | Horst Oil, LLC | Pittsburg, MO 65724 | Oil Operator | Dec 2009 |
| 1904 | Horton Oil Company, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 1905 | Horton, Jack | Independence, KS 67301 | Oil & Gas Operator | Aug 2015 |
| 1906 | Horton, John | Sedan, KS 67361 | Oil & Gas Operator | Jan 2024 |
| 1907 | House, Dustin | Shawnee, KS 66218 | Oil Operator | Jan 2024 |
| 1908 | Housel John R Jr | | Oil Operator | Oct 1994 |
| 1909 | Housel, Robert E. | Cherryvale, KS 67335 | Oil & Gas Operator | Dec 2003 |
| 1910 | Houston Hydrolan | | Oil Operator | Jul 1984 |
| 1911 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | May 2024 |
| 1912 | Howell Oil Compa | | Oil & Gas Operator | Aug 1995 |
| 1913 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Jan 2024 |
| 1914 | Hrbek, R.L. | Merino, CO 80741 | Oil & Gas Operator | Dec 2023 |
| 1915 | HRL Oilfields In | | Oil Operator | Jun 1998 |
| 1916 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 1917 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 1918 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2024 |
| 1919 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 1920 | Huber Oil Company, A General Partnership | Madison, KS 66860 | Oil & Gas Operator | Aug 2023 |
| 1921 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |
| 1922 | Hughes Drilling Co, A General Partnership | Wellsville, KS 66092 | Oil Operator | Jan 2024 |
| 1923 | Hughes Drilling Co. | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 1924 | Hughes Services, LLC | Wellsville, KS 66092 | Oil Operator | Dec 2023 |
| 1925 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 1926 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 1927 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 1928 | Humerickhouse Oil, LLC | Ottawa, KS 66067 | Oil Operator | Jan 2024 |
| 1929 | Humerickhouse, Donald L. | Ottawa, KS 66067 | Oil Operator | Dec 2009 |
| 1930 | Hummingbird Oil, LLC | Sedan, KS 67361 | Oil Operator | Jan 2024 |
| 1931 | Hummon Corp. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 1932 | Hunt Oil, LLC | Garnett, KS 66032 | Oil Operator | May 2023 |
| 1933 | Huntington Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2024 |
| 1934 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 1935 | Hupfer Operating, Inc. | Shawnee, KS 66203 | Oil & Gas Operator | Dec 2019 |
| 1936 | Husain, Mrs. Shahnaz | Tulsa, OK 74136 | Oil Operator | Nov 1996 |
| 1937 | Hutchinson Oil C | | Oil & Gas Operator | May 1995 |
| 1938 | Hutchinson Oil Co. | | Oil & Gas Operator | Jan 2024 |
| 1939 | Hutchison Jay Oi | | Oil Operator | Sep 1991 |
| 1940 | Hutton Charles N | | Oil Operator | Dec 1994 |
| 1941 | Hutton, Charles N., SR. | Iola, KS 66749 | Oil Operator | Nov 2007 |
| 1942 | Hyde-Marrs, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1997 |
| 1943 | I & F Oil And Farm | | Oil & Gas Operator | Dec 2009 |
| 1944 | I & M Oil Production, LLC | Overland Park, KS 66209 | Oil & Gas Operator | Mar 2023 |
| 1945 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Jan 2024 |
| 1946 | Iantha Resources LLC | Garnett, KS 66032 | Oil Operator | Dec 2019 |
| 1947 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Jan 2024 |
| 1948 | Igwt, Inc. | Rose Hill, KS 67133 | Oil & Gas Operator | Jan 2024 |
| 1949 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Mar 2024 |
| 1950 | Imperator Investments LLC | Shawnee, KS 66217 | Oil Operator | Jan 2024 |
| 1951 | Imperial American Oil Corporation | Wichita, KS 67205 | Oil Operator | Dec 2009 |
| 1952 | Imperial Oil & G | | Gas Operator | Jan 1990 |
| 1953 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 1954 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 1955 | Imperial Oil Properties, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2006 |
| 1956 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 1957 | Incline Reserves | | Oil Operator | Apr 1988 |
| 1958 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | May 2024 |
| 1959 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |
| 1960 | Indiek, John | Offerle, KS 67563 | Oil Operator | Nov 2005 |
| 1961 | Inferno Energy | Yates Center, KS 66783 | Oil Operator | Nov 2023 |
| 1962 | Infinity Oil, Inc. | Hays, KS 67601 | Oil Operator | Jan 2024 |
| 1963 | Inlan Oceans, LLC | Coffeyville, KS 67337 | Oil Operator | Dec 2023 |
| 1964 | Innes Petroleum | | Oil Operator | Nov 1994 |
| 1965 | Integrated Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 1966 | Integrated Petroleum Corporation | Denver, CO 80202 | Oil Operator | Jan 2010 |
| 1967 | Inter-American Energy Corp. | Toronto, On Canada M5a1n1, 33139 | Gas Operator | Dec 2019 |
| 1968 | Inter-State Ener | | Oil Operator | Oct 1987 |
| 1969 | Intergy, Inc. | Lomita, CA 90717 | Oil Operator | Jun 1997 |
| 1970 | Interior Oil Cor | | Gas Operator | Jun 1990 |
| 1971 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 1972 | Intermountain Refining Co, Inc | Farmington, NM 87499 | Gas Operator | Aug 2006 |
| 1973 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 1974 | Intrepid Energy Corporation | Independence, KS 67301 | Oil Operator | Mar 2016 |
| 1975 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Feb 2024 |
| 1976 | Investors Drilli | | Gas Operator | Jan 1993 |
| 1977 | Iola Wildcat LLC | Kansas City, MO 64190 | Oil Operator | Dec 2023 |
| 1978 | Ipas Oil Company LLC | Pratt, KS 67124 | Oil Operator | Dec 2019 |
| 1979 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 1980 | Isern, James R. | Wichita, KS 67277 | Oil Operator | Apr 1996 |
| 1981 | Isis Operating Inc | Russell, KS 67665 | Oil Operator | Dec 2023 |
| 1982 | Isle, Michael D. | Coffeyville, KS 67337 | Gas Operator | Jan 2024 |
| 1983 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 1984 | Ivan Holt Well Servicing Inc | Edmond, OK 73003 | Oil Operator | Aug 1999 |
| 1985 | J & D Investment | | Oil Operator | Oct 1993 |
| 1986 | J & D Investment Co. | | Oil & Gas Operator | Oct 2023 |
| 1987 | J & H Oil Compan | | Oil Operator | Jul 1995 |
| 1988 | J & H Oil Company, A General Partnership | Lincolnville, KS 66858 | Oil Operator | Jan 2002 |
| 1989 | J & J Contract Pumping LLC | Wakeeney, KS 67672 | Oil Operator | Jan 2024 |
| 1990 | J & J Oil, A General Partnership | Mound City, KS 66056 | Oil Operator | Dec 2019 |
| 1991 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Jan 2024 |
| 1992 | J & M Oil Compan | | Oil Operator | Oct 1993 |
| 1993 | J & M Production | Luling, TX 78648 | Oil & Gas Operator | Nov 2019 |
| 1994 | J & M Water Serv | | Oil Operator | Sep 1992 |
| 1995 | J & M Water Service, Inc. | Pratt, KS 67124 | Oil Operator | Feb 2000 |
| 1996 | J & P Oil Compan | | Oil Operator | Jul 1991 |
| 1997 | J And A Oil, LLC | Hays, KS 67601 | Oil Operator | Feb 2020 |
| 1998 | J And L Oil Enterprises, Inc. | Winfield, KS 67156 | Oil Operator | Jun 2003 |
| 1999 | J B Gas Detectors, Inc. | Pratt, KS 67124 | Oil Operator | Oct 1994 |
| 2000 | J C B Resources | | Oil Operator | Apr 1990 |