| 2101 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 2102 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 2103 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 2104 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 2105 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 2106 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 2107 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 2108 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 2109 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 2110 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 2111 | Hsumy Oil & Gas, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 2112 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 2113 | Huey Dean | | Oil Operator | Oct 2000 |
| 2114 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 2115 | Huggs & McConathy,Et Al | | Oil & Gas Operator | Dec 1985 |
| 2116 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 2117 | Huggs Inc. & Bec, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2118 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 2119 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 2120 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 2121 | Hughes & New-D. Braswell | | Oil & Gas Operator | Jun 1983 |
| 2122 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 2123 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Feb 2025 |
| 2124 | Hughes Eastern Petroleum, Inc. | | Oil & Gas Operator | Apr 1993 |
| 2125 | Hughes Eastern Petroleum, LTD. | | Oil & Gas Operator | Jun 1986 |
| 2126 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 2127 | Hughes, Wise & Assoc., Inc | | Oil Operator | Jul 1987 |
| 2128 | Hughes-Denny Petroleum Co.,Inc | | Oil & Gas Operator | Dec 1987 |
| 2129 | Hughes-Leckelt-Maybrier PRDCRS | | Oil Operator | Mar 2022 |
| 2130 | Hughes-Nicklaus Oil Co., LTD. | | Oil & Gas Operator | Feb 1986 |
| 2131 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 2132 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 2133 | Hunt Industries, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2000 |
| 2134 | Hunt Investment Corporation | | Oil & Gas Operator | Jun 1989 |
| 2135 | Hunt Oil Co., Et Al | | Oil & Gas Operator | Nov 1992 |
| 2136 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 2137 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2138 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 2139 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 2140 | Huntlyn Operating, LLC | | Oil & Gas Operator | Sep 2022 |
| 2141 | Hurley Oil And Gas Company | | Oil & Gas Operator | Jan 1997 |
| 2142 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 2143 | Hurricane Iron & Steel, Inc. | | Oil Operator | Dec 1993 |
| 2144 | Hutson Oil Co. | | Oil & Gas Operator | Nov 2024 |
| 2145 | Hy-Mark Oil & Gas, Inc. | | Oil Operator | Mar 1991 |
| 2146 | Hyatt Exploration, Inc. | | Oil Operator | Jul 1995 |
| 2147 | Hyco Oil Inc | Newcastle, WY 82701 | Oil & Gas Operator | Dec 2006 |
| 2148 | Hydrocarbon MGMT., Inc. | | Oil & Gas Operator | Mar 1997 |
| 2149 | Hyman Muslow | | Oil Operator | Jun 1995 |
| 2150 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 2151 | I. H. Delatte | | Oil & Gas Operator | Jul 1991 |
| 2152 | I. W. McKnight,Production | | Oil Operator | Jan 1986 |
| 2153 | I.G. Petroleum, L.L.C | | Oil & Gas Operator | Dec 2018 |
| 2154 | Iberia Operating Corporation | | Oil & Gas Operator | Jan 2003 |
| 2155 | Idc Energy Corp | Warren, PA 16365-0792 | Oil & Gas Operator | Dec 2021 |
| 2156 | Ike Lovelady, Inc. | | Oil & Gas Operator | Jun 1985 |
| 2157 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 2158 | Imperial-American Energy,Inc. | | Oil & Gas Operator | Jul 1978 |
| 2159 | Inabnet Est., H. Inabnet, Agt. | | Gas Operator | Jul 2005 |
| 2160 | Inactive Operator | | Oil Operator | Dec 1982 |
| 2161 | Independent Exploration Company | | Oil & Gas Operator | Dec 2000 |
| 2162 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | May 2025 |
| 2163 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 2164 | Indigo Haynesville LLC | | Gas Operator | Feb 2018 |
| 2165 | Indigo II Louisiana Operating LLC | | Oil & Gas Operator | Feb 2015 |
| 2166 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 2167 | Indigo Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2019 |
| 2168 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 2169 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 2170 | Infinity Oil And Gas, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 2171 | Inflow Petroleum Resources LP | Dallas, TX 75240 | Oil & Gas Operator | Sep 2008 |
| 2172 | Ingo Energy, LLC | | Oil & Gas Operator | Dec 2016 |
| 2173 | Inland Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 2174 | Innovative Resources, Inc. | | Oil Operator | Feb 2022 |
| 2175 | Inpetco, Inc. | | Oil & Gas Operator | Aug 1991 |
| 2176 | Int'L Petr & Expl Opr Corp | | Oil & Gas Operator | Jan 2012 |
| 2177 | Integrated Exploration & Production LLC | | Oil & Gas Operator | Aug 2024 |
| 2178 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 2179 | Intercoastal Operating Co. | | Oil Operator | Dec 1980 |
| 2180 | International Oil & Gas Corp. | | Oil & Gas Operator | Dec 1986 |
| 2181 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | May 2025 |
| 2182 | Interstate Producing Servs,Inc | | Oil & Gas Operator | May 1987 |
| 2183 | Intrepid Drilling, LLC | | Oil & Gas Operator | Jan 2025 |
| 2184 | Investco Oil And Gas Inc | | Oil & Gas Operator | Jan 2025 |
| 2185 | Investment Trends Corp. | | Gas Operator | Mar 1988 |
| 2186 | Iowa Production Company, Inc. | | Oil & Gas Operator | Jan 1992 |
| 2187 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 2188 | Iron Springs Operating Co. Inc | | Oil & Gas Operator | Jan 2025 |
| 2189 | Irvin Operations, Inc. | | Oil Operator | Aug 1996 |
| 2190 | Irwin H. Parnes | | Oil Operator | Jun 1982 |
| 2191 | Island Petroleum, Inc. | | Gas Operator | Mar 1998 |
| 2192 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 2193 | J & A Oil Company | Odessa, TX 79764 | Oil & Gas Operator | May 2025 |
| 2194 | J & B Service Co. | | Oil Operator | Nov 2024 |
| 2195 | J & J Oil Company | Luling, TX 78648 | Oil & Gas Operator | Mar 2015 |
| 2196 | J & J Onshore Production, Inc. | | Oil & Gas Operator | Feb 2016 |
| 2197 | J & L Oil Company | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 2198 | J & M Oil | | Oil Operator | Apr 1994 |
| 2199 | J & P Production | Holdenville, OK 74848-9485 | Oil Operator | Mar 2015 |
| 2200 | J & R Systems, Inc. | | Oil Operator | Apr 2002 |