| 101 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 102 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 103 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 104 | Dan A. Hughes Company | | Oil & Gas Operator | Dec 2005 |
| 105 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 106 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 107 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Dec 2024 |
| 108 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 109 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 110 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 111 | Denex, Inc. | | Oil & Gas Operator | Jul 1983 |
| 112 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 113 | Desco Oil Company | Houston, TX 77056 | Oil & Gas Operator | Feb 2017 |
| 114 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 115 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 116 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Jul 2024 |
| 117 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 118 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 119 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 120 | E. A. Courtney | | Oil & Gas Operator | Oct 1978 |
| 121 | Edwin L Cox & Berry R Cox-Eni | | Oil & Gas Operator | May 1986 |
| 122 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 123 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 124 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 125 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Sep 2024 |
| 126 | Elf Aquitaine Operating, Inc. | | Oil & Gas Operator | Jan 1992 |
| 127 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 128 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 129 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 130 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 131 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 132 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 133 | Energy Resource Associates Inc | | Gas Operator | Nov 1988 |
| 134 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 135 | Energy Xxi Gulf Coast, Inc. | | Oil & Gas Operator | Dec 2008 |
| 136 | Energy Xxi Onshore, LLC | | Oil & Gas Operator | Dec 2023 |
| 137 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 138 | Enlink Lig, LLC | | Oil Operator | Jul 2024 |
| 139 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 140 | Enstar Petroleum Company | | Oil & Gas Operator | Jul 1985 |
| 141 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 142 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 143 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 144 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jun 2024 |
| 145 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 146 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Sep 2024 |
| 147 | Exoro Energy, L.L.C. | | Oil & Gas Operator | Jun 2021 |
| 148 | Expert Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2024 |
| 149 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 150 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 151 | Falcon Bay Operations, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2007 |
| 152 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 153 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 154 | Flash Gas & Oil, Inc. | | Oil & Gas Operator | May 1991 |
| 155 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 156 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 157 | Forcenergy Gas Exploration Inc. | Miami, FL 33129 | Oil & Gas Operator | Aug 1996 |
| 158 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 159 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 160 | Forman Petroleum Corporation | | Oil & Gas Operator | Aug 2001 |
| 161 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2024 |
| 162 | Gap Energy, Inc. | | Oil & Gas Operator | Oct 1995 |
| 163 | Gas Transportation Corporation | | Oil & Gas Operator | Aug 1995 |
| 164 | Gcer Onshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 165 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 166 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 167 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 168 | Getty Reserve Oil, Inc. | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 169 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 170 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 171 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 172 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 173 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 174 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 175 | Grand Energy, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2002 |
| 176 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 177 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 178 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 179 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jul 2024 |
| 180 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 181 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Sep 2024 |
| 182 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |
| 183 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 184 | Hadson Petroleum (USA), Inc. | | Oil & Gas Operator | Dec 1992 |
| 185 | Hassie Hunt Expl. Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2008 |
| 186 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 187 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 188 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2024 |
| 189 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 190 | Hicks Production Co. | | Oil & Gas Operator | Apr 1991 |
| 191 | High-Hope Oil And Gas, Inc | | Oil & Gas Operator | Mar 2017 |
| 192 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 193 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 194 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Dec 2024 |
| 195 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 196 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 197 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 198 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 199 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 200 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |