| 101 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 102 | D & G Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 1995 |
| 103 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 104 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 105 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 106 | Davis Oil Company-Cox | | Oil & Gas Operator | Aug 1980 |
| 107 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Oct 2025 |
| 108 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 109 | Delta Development Co. Inc. | | Oil & Gas Operator | Dec 1988 |
| 110 | Delta Exploration Company Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 111 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 112 | Denbury Offshore, Inc. | | Oil & Gas Operator | Nov 2004 |
| 113 | Despot Expl. Inc-Serio Expl Co | | Oil & Gas Operator | Apr 1990 |
| 114 | Despot Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 115 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 116 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 117 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 118 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 119 | Dexco, Inc. | | Oil & Gas Operator | May 1990 |
| 120 | Diamex Company | | Oil & Gas Operator | Oct 1982 |
| 121 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 122 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 123 | Dixie Well Service, Inc. | | Oil & Gas Operator | Jul 1995 |
| 124 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 125 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 126 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 127 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 128 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | Nov 2024 |
| 129 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 130 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 131 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 132 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jul 2025 |
| 133 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 134 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 135 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 136 | Enbridge P/LS (La Intra.)L.L.C. | | Oil Operator | Oct 2009 |
| 137 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 138 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 139 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 140 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 141 | Energy Resource Technology Gom, LLC | | Oil & Gas Operator | Oct 2019 |
| 142 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 143 | Energy Self-Service Oils, Inc. | | Oil & Gas Operator | Apr 2009 |
| 144 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 145 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 146 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 147 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 148 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 149 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 150 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 151 | Epl Oil & Gas, Inc | | Oil & Gas Operator | Aug 2015 |
| 152 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 153 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 154 | Euroamerican Energy Group Inc | | Oil & Gas Operator | Oct 1993 |
| 155 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 156 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 157 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 158 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 159 | Fantome, LLC | | Oil Operator | Jan 2007 |
| 160 | Fee Energy Corporation | | Oil & Gas Operator | Jul 1978 |
| 161 | Fieldwood Energy Offshore LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 162 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 163 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Oct 2025 |
| 164 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 165 | Flores & Rucks, Inc. | | Oil & Gas Operator | Jun 1997 |
| 166 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 167 | Florida Gas Transmission Co. | | Oil Operator | Dec 2007 |
| 168 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 169 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 170 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 171 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 172 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 173 | Forman Petroleum Corporation | | Oil & Gas Operator | Aug 2001 |
| 174 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 175 | Freeport-McMoran Inc | New Orleans, LA 70160 | Oil & Gas Operator | Apr 1997 |
| 176 | Freeport-McMoran Oil & Gas Co. | | Oil & Gas Operator | Jan 1991 |
| 177 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 178 | George R. Brown | | Oil & Gas Operator | Mar 1984 |
| 179 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 180 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 181 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 182 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 183 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 184 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 185 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 186 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 187 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 188 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 189 | Greka Am Inc | Santa Maria, CA 93454 | Oil & Gas Operator | May 2013 |
| 190 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 191 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 192 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 193 | Gulf South Oil & Gas, Inc. | | Oil & Gas Operator | Feb 1990 |
| 194 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 195 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 196 | Gulfland Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 197 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 198 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 199 | Hampton Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Mar 1996 |
| 200 | Harvest Oil & Gas, LLC | | Oil & Gas Operator | Feb 2012 |