| 2101 | Herbert J. Schmitz | | Oil & Gas Operator | Dec 1987 |
| 2102 | Herbst Resources, Inc. | Mandeville, LA 70448 | Oil & Gas Operator | Aug 2003 |
| 2103 | Herd Producing Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 2104 | Heritage Energy Company | | Oil & Gas Operator | Jun 2001 |
| 2105 | Heritage Operating Co., Inc. The | Stafford, TX 77497 | Oil & Gas Operator | May 1997 |
| 2106 | Herlin Et Al | | Oil & Gas Operator | Mar 1985 |
| 2107 | Herman Fields | | Oil & Gas Operator | May 1989 |
| 2108 | Herring Production Co | | Oil & Gas Operator | Mar 1992 |
| 2109 | Hess Corporation, A De Corp. | | Oil & Gas Operator | Oct 2006 |
| 2110 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 2111 | HGH Energy, Inc. | | Oil & Gas Operator | Jun 2001 |
| 2112 | Hibbard-Frost-Smith | | Oil & Gas Operator | Apr 1990 |
| 2113 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 2114 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 2115 | Highland Minerals Inc | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 2116 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 2117 | Highlander Oil & Gas Assets LLC | | Gas Operator | Jan 2025 |
| 2118 | Highlands Operating Co., Inc. | | Oil & Gas Operator | May 1990 |
| 2119 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Feb 2026 |
| 2120 | Hilburn Ind., Inc. | | Oil Operator | Jan 1978 |
| 2121 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 2122 | Hill Production | | Oil & Gas Operator | Nov 1981 |
| 2123 | Hill Production Co Inc-Wisconsin | Humble, TX 77347 | Oil & Gas Operator | Jun 1993 |
| 2124 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 2125 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 2126 | Hillside Oil & Gas, LLC | Midland, TX 79708 | Oil & Gas Operator | Apr 2016 |
| 2127 | Hilty Interests, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | Jun 1989 |
| 2128 | Hinton Well Servicing, Inc. | | Oil Operator | Feb 2008 |
| 2129 | Hispanic Oil & Gas Energy, LLC | Houston, TX 77056 | Oil Operator | Nov 2025 |
| 2130 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 2131 | Hobbs Oil Co. | | Oil Operator | Dec 1999 |
| 2132 | Hobbs Production LLC | | Oil Operator | Mar 2023 |
| 2133 | Hochendel Consultants | | Oil & Gas Operator | Jul 1995 |
| 2134 | Hogan Drilling Company, Inc. | | Oil & Gas Operator | Mar 1981 |
| 2135 | Hogan Energy Corporation | | Oil & Gas Operator | Oct 1999 |
| 2136 | Hogan Exploration, Inc. | | Oil & Gas Operator | Mar 2000 |
| 2137 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 2138 | Holland Production Co | | Oil Operator | Aug 1982 |
| 2139 | Holleman & Parks Oil & Gas Inc | | Oil & Gas Operator | May 1995 |
| 2140 | Hollenshead Oil Co. | | Oil & Gas Operator | Mar 1992 |
| 2141 | Holston-GR. Sou. Oil & Gas Co. | | Oil & Gas Operator | Mar 1981 |
| 2142 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Feb 2026 |
| 2143 | Homer D. Oliver | | Gas Operator | Sep 1998 |
| 2144 | Homer E. Hines, Inc. | | Oil Operator | Sep 1978 |
| 2145 | Hondo Operating, Inc. | | Oil & Gas Operator | Aug 1997 |
| 2146 | Hootkins-Smith,La LTD. | | Gas Operator | Jun 1985 |
| 2147 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 2148 | Horizon Expl. & Dev. Co., Inc. | | Oil & Gas Operator | Jun 1995 |
| 2149 | Horton & Freeman | | Oil Operator | Apr 1983 |
| 2150 | Hosston Oil Inc. | | Oil Operator | Dec 1993 |
| 2151 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 2152 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 2153 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 2154 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 2155 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Apr 1994 |
| 2156 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 2157 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 2158 | Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 2159 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 2160 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 2161 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 2162 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 2163 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 2164 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 2165 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 2166 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 2167 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 2168 | Hsumy Oil & Gas, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 2169 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 2170 | Huey Dean | | Oil Operator | Oct 2000 |
| 2171 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 2172 | Huggs & McConathy,Et Al | | Oil & Gas Operator | Dec 1985 |
| 2173 | Huggs Inc & John Franks, Et Al | | Oil & Gas Operator | Dec 1992 |
| 2174 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 2175 | Huggs Inc. & Bec, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2176 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2177 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 2178 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 2179 | Hughes & New-D. Braswell | | Oil & Gas Operator | Jun 1983 |
| 2180 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 2181 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Dec 2025 |
| 2182 | Hughes Eastern Petroleum, Inc. | | Oil & Gas Operator | Apr 1993 |
| 2183 | Hughes Eastern Petroleum, LTD | | Oil & Gas Operator | Jun 1986 |
| 2184 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 2185 | Hughes, Wise & Assoc., Inc | | Oil Operator | Jul 1987 |
| 2186 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 2187 | Hughes-Leckelt-Maybrier PRDCRS | | Oil Operator | Mar 2022 |
| 2188 | Hughes-Nicklaus Oil Co., LTD. | | Oil & Gas Operator | Feb 1986 |
| 2189 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 2190 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 2191 | Hunt Industries, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2000 |
| 2192 | Hunt Investment Corporation | | Oil & Gas Operator | Jun 1989 |
| 2193 | Hunt Oil Co., Et Al | | Oil & Gas Operator | Nov 1992 |
| 2194 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 2195 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2196 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2197 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 2198 | Huntlyn Operating, LLC | | Oil & Gas Operator | Sep 2022 |
| 2199 | Hurley Oil And Gas Company | | Oil & Gas Operator | Jan 1997 |
| 2200 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |