| 2001 | Hummingbird Oil, LLC | Sedan, KS 67361 | Oil Operator | Mar 2025 |
| 2002 | Hummon Corp. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 2003 | Hunt Oil, LLC | Garnett, KS 66032 | Oil Operator | Feb 2024 |
| 2004 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jul 2025 |
| 2005 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 2006 | Hupfer Operating, Inc. | Shawnee, KS 66203 | Oil & Gas Operator | Dec 2019 |
| 2007 | Husain, Mrs. Shahnaz | Tulsa, OK 74136 | Oil Operator | Nov 1996 |
| 2008 | Hutchinson Oil C | | Oil & Gas Operator | May 1995 |
| 2009 | Hutchinson Oil Co. | | Oil & Gas Operator | Mar 2025 |
| 2010 | Hutchison Jay Oi | | Oil Operator | Sep 1991 |
| 2011 | Hutton Charles N | | Oil Operator | Dec 1994 |
| 2012 | Hutton, Charles N., SR. | Iola, KS 66749 | Oil Operator | Nov 2007 |
| 2013 | Hyde-Marrs, Inc. | Wichita, KS 67202 | Oil Operator | Aug 1997 |
| 2014 | I & F Oil And Farm | | Oil & Gas Operator | Dec 2009 |
| 2015 | I & M Oil Production, LLC | Overland Park, KS 66209 | Oil & Gas Operator | Mar 2025 |
| 2016 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Mar 2025 |
| 2017 | Iantha Resources LLC | Garnett, KS 66032 | Oil Operator | Dec 2019 |
| 2018 | Iconic Oil & Gas LLC | Dallas, TX 75229 | Gas Operator | Mar 2025 |
| 2019 | Iep Kansas Gas, LLC | Burlington, CO 80807 | Oil & Gas Operator | May 2025 |
| 2020 | Igwt, Inc. | Rose Hill, KS 67133 | Oil & Gas Operator | Mar 2025 |
| 2021 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | May 2025 |
| 2022 | Imperator Investments LLC | Shawnee, KS 66217 | Oil Operator | Aug 2024 |
| 2023 | Imperial American Oil Corporation | Wichita, KS 67205 | Oil Operator | Dec 2009 |
| 2024 | Imperial Oil & G | | Gas Operator | Jan 1990 |
| 2025 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 2026 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 2027 | Imperial Oil Properties, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2006 |
| 2028 | Impetro Nonop LLC | | Oil Operator | Mar 2025 |
| 2029 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 2030 | Incline Reserves | | Oil Operator | Apr 1988 |
| 2031 | Independence Energy LLC | | Oil Operator | Mar 2025 |
| 2032 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jul 2025 |
| 2033 | Indian Wells Oil | | Oil & Gas Operator | Jul 1995 |
| 2034 | Indiek, John | Offerle, KS 67563 | Oil Operator | Nov 2005 |
| 2035 | Inferno Energy | Yates Center, KS 66783 | Oil Operator | Mar 2025 |
| 2036 | Infinity Oil, Inc. | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 2037 | Inlan Oceans, LLC | Coffeyville, KS 67337 | Oil Operator | Mar 2025 |
| 2038 | Innes Petroleum | | Oil Operator | Nov 1994 |
| 2039 | Integrated Energy Inc | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 2040 | Integrated Petroleum Corporation | Denver, CO 80202 | Oil Operator | Jan 2010 |
| 2041 | Inter-American Energy Corp. | Toronto, On Canada M5a1n1, 33139 | Gas Operator | Dec 2019 |
| 2042 | Inter-State Ener | | Oil Operator | Oct 1987 |
| 2043 | Intergy, Inc. | Lomita, CA 90717 | Oil Operator | Jun 1997 |
| 2044 | Interior Oil Cor | | Gas Operator | Jun 1990 |
| 2045 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 2046 | Intermountain Refining Co, Inc | Farmington, NM 87499 | Gas Operator | Aug 2006 |
| 2047 | International Ventures, Inc. | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 2048 | Intrepid Energy Corporation | Independence, KS 67301 | Oil Operator | Mar 2016 |
| 2049 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | May 2025 |
| 2050 | Investors Drilli | | Gas Operator | Jan 1993 |
| 2051 | Iola Wildcat LLC | Kansas City, MO 64190 | Oil Operator | Mar 2025 |
| 2052 | Ipas Oil Company LLC | Pratt, KS 67124 | Oil Operator | Dec 2019 |
| 2053 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 2054 | Isern, James R. | Wichita, KS 67277 | Oil Operator | Apr 1996 |
| 2055 | Isis Operating Inc | Russell, KS 67665 | Oil Operator | Mar 2025 |
| 2056 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Mar 2025 |
| 2057 | Ivan Holt Well Servicing Inc | Edmond, OK 73003 | Oil Operator | Aug 1999 |
| 2058 | J & D Investment | | Oil Operator | Oct 1993 |
| 2059 | J & D Investment Co. | | Oil & Gas Operator | Feb 2025 |
| 2060 | J & H Oil Compan | | Oil Operator | Jul 1995 |
| 2061 | J & H Oil Company, A General Partnership | Lincolnville, KS 66858 | Oil Operator | Jan 2002 |
| 2062 | J & J Contract Pumping LLC | Wakeeney, KS 67672 | Oil Operator | Dec 2019 |
| 2063 | J & J Oil, A General Partnership | Mound City, KS 66056 | Oil Operator | Dec 2019 |
| 2064 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Mar 2025 |
| 2065 | J & M Oil Compan | | Oil Operator | Oct 1993 |
| 2066 | J & M Production | Luling, TX 78648 | Oil & Gas Operator | Nov 2019 |
| 2067 | J & M Water Serv | | Oil Operator | Sep 1992 |
| 2068 | J & M Water Service, Inc. | Pratt, KS 67124 | Oil Operator | Feb 2000 |
| 2069 | J & P Oil Compan | | Oil Operator | Jul 1991 |
| 2070 | J And A Oil, LLC | Hays, KS 67601 | Oil Operator | Feb 2020 |
| 2071 | J And L Oil Enterprises, Inc. | Winfield, KS 67156 | Oil Operator | Jun 2003 |
| 2072 | J B Gas Detectors, Inc. | Pratt, KS 67124 | Oil Operator | Oct 1994 |
| 2073 | J C B Resources | | Oil Operator | Apr 1990 |
| 2074 | J Carter Oil | | Oil Operator | Dec 2024 |
| 2075 | J D Dreiling Oil, Inc. | Claflin, KS 67525 | Oil Operator | Mar 2025 |
| 2076 | J D Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2005 |
| 2077 | J E B Oil Resear | | Oil & Gas Operator | Nov 1993 |
| 2078 | J M K Incorporat | | Oil & Gas Operator | Dec 1996 |
| 2079 | J W Oil Co. | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 2080 | J&H Oil Company | Gainesville, TX 76240 | Oil & Gas Operator | Jul 2025 |
| 2081 | J&S Jackson Oil | | Oil Operator | Mar 2025 |
| 2082 | J-F Oil Company LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2002 |
| 2083 | J-V Oil, LLC | Chanute, KS 66720 | Oil & Gas Operator | Mar 2025 |
| 2084 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Jul 2025 |
| 2085 | J. C. Oil Company | Odessa, TX 79766 | Oil & Gas Operator | Mar 2015 |
| 2086 | J. D. & M., Inc. | Cherryvale, KS 67335 | Oil Operator | Jan 2025 |
| 2087 | J. Herrick Pro | | Oil Operator | Feb 2025 |
| 2088 | J. K. Brown, Inc. | Littleton, CO 80161 | Gas Operator | Dec 2019 |
| 2089 | J. W. Oil | | Oil Operator | Mar 2025 |
| 2090 | J.D. Drilling Co. | Basehor, KS 66007 | Oil & Gas Operator | Dec 2023 |
| 2091 | J.E.B. Oil Research, Inc. | Neodesha, KS 66757 | Gas Operator | Sep 2003 |
| 2092 | J.H. R., Inc. | Bridgeville, PA 15017 | Oil Operator | Jan 2013 |
| 2093 | J.H.R. Corporation | Bridgeville, PA 15017 | Oil & Gas Operator | Jul 2001 |
| 2094 | J.P. Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 2095 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 2096 | J.R. Oil Productions | | Oil Operator | Jul 2019 |
| 2097 | Jack Exploration, Inc. | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2017 |
| 2098 | Jack W Sanders & Son, General Partnership | Wellsville, KS 66092 | Oil Operator | Dec 2024 |
| 2099 | Jackknife Oil | Longton, KS 67352 | Oil Operator | Apr 1989 |
| 2100 | Jackman & Jackma | | Oil Operator | Jan 1986 |