| 2001 | Herlin Et Al | | Oil & Gas Operator | Mar 1985 |
| 2002 | Herman Fields | | Oil & Gas Operator | May 1989 |
| 2003 | Herring Production Co | | Oil & Gas Operator | Mar 1992 |
| 2004 | Hess Corporation, A De Corp. | | Oil & Gas Operator | Oct 2006 |
| 2005 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2024 |
| 2006 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 2007 | Hibbard-Frost-Smith | | Oil & Gas Operator | Apr 1990 |
| 2008 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 2009 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 2010 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 2011 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 2012 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2024 |
| 2013 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 2014 | Highmark Energy Operating, LLC | Poynor, TX 75782 | Oil & Gas Operator | Apr 2024 |
| 2015 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 2016 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Apr 2024 |
| 2017 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 2018 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 2019 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 2020 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 2021 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 2022 | Hilty Interests, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Jun 1989 |
| 2023 | Hinton Well Servicing, Inc. | | Oil Operator | Feb 2008 |
| 2024 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 2025 | Hobbs Oil Co. | | Oil Operator | Dec 1999 |
| 2026 | Hobbs Production LLC | | Oil Operator | Mar 2023 |
| 2027 | Hochendel Consultants | | Oil & Gas Operator | Jul 1995 |
| 2028 | Hogan Drilling Company, Inc. | | Oil & Gas Operator | Mar 1981 |
| 2029 | Hogan Energy Corporation | | Oil & Gas Operator | Oct 1999 |
| 2030 | Hogan Exploration, Inc. | | Oil & Gas Operator | Mar 2000 |
| 2031 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 2032 | Holland Production Co | | Oil Operator | Aug 1982 |
| 2033 | Hollenshead Oil Co. | | Oil & Gas Operator | Mar 1992 |
| 2034 | Holston-GR. Sou. Oil & Gas Co. | | Oil & Gas Operator | Mar 1981 |
| 2035 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Apr 2024 |
| 2036 | Homer D. Oliver | | Gas Operator | Sep 1998 |
| 2037 | Homer E. Hines, Inc. | | Oil Operator | Sep 1978 |
| 2038 | Hondo Operating, Inc. | | Oil & Gas Operator | Sep 1997 |
| 2039 | Hootkins-Smith,La LTD. | | Gas Operator | Jun 1985 |
| 2040 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 2041 | Horizon Expl. & Dev. Co., Inc. | | Oil & Gas Operator | Jun 1995 |
| 2042 | Horton & Freeman | | Oil Operator | Apr 1983 |
| 2043 | Hosston Oil Inc. | | Oil Operator | Dec 1993 |
| 2044 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 2045 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 2046 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 2047 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 2048 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Mar 1994 |
| 2049 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 2050 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 2051 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 2052 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 2053 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 2054 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 2055 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 2056 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 2057 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 2058 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 2059 | Hsumy Oil & Gas Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 2060 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 2061 | Huey Dean | | Oil Operator | Oct 2000 |
| 2062 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 2063 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 2064 | Huggs Inc. & Bec, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2065 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2066 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 2067 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 2068 | Hughes & New-D. Braswell | | Oil & Gas Operator | Jun 1983 |
| 2069 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 2070 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Dec 2023 |
| 2071 | Hughes Eastern Petroleum, Inc. | | Oil & Gas Operator | Apr 1993 |
| 2072 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 2073 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 2074 | Hughes, Wise & Assoc., Inc | | Oil Operator | Jul 1987 |
| 2075 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 2076 | Hughes-Leckelt-Maybrier PRDCRS | | Oil Operator | Mar 2022 |
| 2077 | Hughes-Nicklaus Oil Co., LTD. | | Oil & Gas Operator | Feb 1986 |
| 2078 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 2079 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 2080 | Hunt Industries, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2000 |
| 2081 | Hunt Investment Corporation | | Oil & Gas Operator | Jun 1989 |
| 2082 | Hunt Oil Co., Et Al | | Oil & Gas Operator | Nov 1992 |
| 2083 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 2084 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2085 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2086 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 2087 | Huntlyn Operating, LLC | | Oil & Gas Operator | Sep 2022 |
| 2088 | Hurley Oil And Gas Company | | Oil & Gas Operator | Jan 1997 |
| 2089 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 2090 | Hurricane Iron & Steel, Inc. | | Oil Operator | Dec 1993 |
| 2091 | Hutson Oil Co. | | Oil & Gas Operator | Dec 2023 |
| 2092 | Hy-Mark Oil & Gas, Inc. | | Oil Operator | Mar 1991 |
| 2093 | Hyatt Exploration, Inc. | | Oil Operator | Jul 1995 |
| 2094 | Hyco Oil Inc | Newcastle, WY 82701 | Oil & Gas Operator | Dec 2006 |
| 2095 | Hydrocarbon MGMT., Inc. | | Oil & Gas Operator | Mar 1997 |
| 2096 | Hyman Muslow | | Oil Operator | Jun 1995 |
| 2097 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 2098 | I. H. Delatte | | Oil & Gas Operator | Jul 1991 |
| 2099 | I. W. McKnight,Production | | Oil Operator | Jan 1986 |
| 2100 | I.G. Petroleum, L.L.C | | Oil & Gas Operator | Dec 2018 |