| 2001 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2025 |
| 2002 | Howell Oil Compa | | Oil & Gas Operator | Aug 1995 |
| 2003 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Nov 2024 |
| 2004 | Hrbek, R.L. | Merino, CO 80741 | Oil & Gas Operator | Dec 2023 |
| 2005 | HRL Oilfields In | | Oil Operator | Jun 1998 |
| 2006 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 2007 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 2008 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Mar 2025 |
| 2009 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 2010 | Huber Oil Company, A General Partnership | Madison, KS 66860 | Oil & Gas Operator | Nov 2024 |
| 2011 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |
| 2012 | Hughes Drilling Co, A General Partnership | Wellsville, KS 66092 | Oil Operator | Nov 2024 |
| 2013 | Hughes Drilling Co. | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 2014 | Hughes Services, LLC | Wellsville, KS 66092 | Oil Operator | Nov 2024 |
| 2015 | Hugoton Energy C | | Oil & Gas Operator | Feb 2004 |
| 2016 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 2017 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 2018 | Humerickhouse Oil, LLC | Ottawa, KS 66067 | Oil Operator | Nov 2024 |
| 2019 | Humerickhouse, Donald L. | Ottawa, KS 66067 | Oil Operator | Dec 2009 |
| 2020 | Hummingbird Oil, LLC | Sedan, KS 67361 | Oil Operator | Oct 2024 |
| 2021 | Hummon Corp. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 2022 | Hunt Oil, LLC | Garnett, KS 66032 | Oil Operator | Feb 2024 |
| 2023 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 2024 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 2025 | Hupfer Operating, Inc. | Shawnee, KS 66203 | Oil & Gas Operator | Dec 2019 |
| 2026 | Hurricane Services, Inc. | Wichita, KS 67202 | Oil Operator | Oct 2024 |
| 2027 | Husain, Mrs. Shahnaz | Tulsa, OK 74136 | Oil Operator | Nov 1996 |
| 2028 | Hutchinson Oil C | | Oil & Gas Operator | May 1995 |
| 2029 | Hutchinson Oil Co. | | Oil & Gas Operator | Nov 2024 |
| 2030 | Hutchison Jay Oi | | Oil Operator | Sep 1991 |
| 2031 | Hutton Charles N | | Oil Operator | Dec 1994 |
| 2032 | Hutton, Charles N., SR. | Iola, KS 66749 | Oil Operator | Nov 2007 |
| 2033 | Hyde-Marrs, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1997 |
| 2034 | I & F Oil And Farm | | Oil & Gas Operator | Dec 2009 |
| 2035 | I & M Oil Production, LLC | Overland Park, KS 66209 | Oil & Gas Operator | Nov 2024 |
| 2036 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Nov 2024 |
| 2037 | Iantha Resources LLC | Garnett, KS 66032 | Oil Operator | Dec 2019 |
| 2038 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Nov 2024 |
| 2039 | Iep Kansas Gas, LLC | Burlington, CO 80807 | Oil & Gas Operator | Jan 2025 |
| 2040 | Igwt, Inc. | Rose Hill, KS 67133 | Oil & Gas Operator | Nov 2024 |
| 2041 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2025 |
| 2042 | Imperator Investments LLC | Shawnee, KS 66217 | Oil Operator | Aug 2024 |
| 2043 | Imperial American Oil Corporation | Wichita, KS 67205 | Oil Operator | Dec 2009 |
| 2044 | Imperial Oil & G | | Gas Operator | Jan 1990 |
| 2045 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 2046 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 2047 | Imperial Oil Properties, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2006 |
| 2048 | Impetro Nonop LLC | | Oil Operator | Nov 2024 |
| 2049 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 2050 | Incline Reserves | | Oil Operator | Apr 1988 |
| 2051 | Independence Energy LLC | | Oil Operator | Nov 2024 |
| 2052 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2025 |
| 2053 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |
| 2054 | Indiek, John | Offerle, KS 67563 | Oil Operator | Nov 2005 |
| 2055 | Inferno Energy | Yates Center, KS 66783 | Oil Operator | Oct 2024 |
| 2056 | Infinity Oil, Inc. | Hays, KS 67601 | Oil Operator | Nov 2024 |
| 2057 | Inlan Oceans, LLC | Coffeyville, KS 67337 | Oil Operator | Oct 2024 |
| 2058 | Innes Petroleum | | Oil Operator | Nov 1994 |
| 2059 | Integrated Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2060 | Integrated Petroleum Corporation | Denver, CO 80202 | Oil Operator | Jan 2010 |
| 2061 | Inter-American Energy Corp. | Toronto, On Canada M5a1n1, 33139 | Gas Operator | Dec 2019 |
| 2062 | Inter-State Ener | | Oil Operator | Oct 1987 |
| 2063 | Intergy, Inc. | Lomita, CA 90717 | Oil Operator | Jun 1997 |
| 2064 | Interior Oil Cor | | Gas Operator | Jun 1990 |
| 2065 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 2066 | Intermountain Refining Co, Inc | Farmington, NM 87499 | Gas Operator | Aug 2006 |
| 2067 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 2068 | Intrepid Energy Corporation | Independence, KS 67301 | Oil Operator | Mar 2016 |
| 2069 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Jan 2025 |
| 2070 | Investors Drilli | | Gas Operator | Jan 1993 |
| 2071 | Iola Wildcat LLC | Kansas City, MO 64190 | Oil Operator | Nov 2024 |
| 2072 | Ipas Oil Company LLC | Pratt, KS 67124 | Oil Operator | Dec 2019 |
| 2073 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 2074 | Isern, James R. | Wichita, KS 67277 | Oil Operator | Apr 1996 |
| 2075 | Isern-Schultz Oi | | Oil & Gas Operator | Jul 1988 |
| 2076 | Isis Operating Inc | Russell, KS 67665 | Oil Operator | Nov 2024 |
| 2077 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Nov 2024 |
| 2078 | Ivan Holt Well Servicing Inc | Edmond, OK 73003 | Oil Operator | Aug 1999 |
| 2079 | J & D Investment | | Oil Operator | Oct 1993 |
| 2080 | J & D Investment Co. | | Oil & Gas Operator | Aug 2024 |
| 2081 | J & H Oil Compan | | Oil Operator | Jul 1995 |
| 2082 | J & H Oil Company, A General Partnership | Lincolnville, KS 66858 | Oil Operator | Jan 2002 |
| 2083 | J & J Contract Pumping LLC | Wakeeney, KS 67672 | Oil Operator | Dec 2019 |
| 2084 | J & J Oil, A General Partnership | Mound City, KS 66056 | Oil Operator | Dec 2019 |
| 2085 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Nov 2024 |
| 2086 | J & M Oil Compan | | Oil Operator | Oct 1993 |
| 2087 | J & M Production | Luling, TX 78648 | Oil & Gas Operator | Nov 2019 |
| 2088 | J & M Water Serv | | Oil Operator | Sep 1992 |
| 2089 | J & M Water Service, Inc. | Pratt, KS 67124 | Oil Operator | Feb 2000 |
| 2090 | J & P Oil Compan | | Oil Operator | Jul 1991 |
| 2091 | J And A Oil, LLC | Hays, KS 67601 | Oil Operator | Feb 2020 |
| 2092 | J And L Oil Enterprises, Inc. | Winfield, KS 67156 | Oil Operator | Jun 2003 |
| 2093 | J B Gas Detectors, Inc. | Pratt, KS 67124 | Oil Operator | Oct 1994 |
| 2094 | J C B Resources | | Oil Operator | Apr 1990 |
| 2095 | J Carter Oil | | Oil Operator | Jul 2024 |
| 2096 | J D Dreiling Oil, Inc. | Claflin, KS 67525 | Oil Operator | Nov 2024 |
| 2097 | J D Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2005 |
| 2098 | J E B Oil Resear | | Oil & Gas Operator | Nov 1993 |
| 2099 | J M K Incorporat | | Oil & Gas Operator | Dec 1996 |
| 2100 | J W Oil Co. | Cisco, TX 76437 | Oil & Gas Operator | Mar 2025 |