| 101 | Eurovest Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 102 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jan 2025 |
| 103 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 104 | Expert Oil & Gas, L.L.C. | | Oil & Gas Operator | Nov 2024 |
| 105 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Feb 2026 |
| 106 | Faul Energy, Inc. | | Oil & Gas Operator | Oct 1988 |
| 107 | Fieldwood Onshore LLC | Houston, TX 77098 | Oil & Gas Operator | Feb 2026 |
| 108 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Feb 2026 |
| 109 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 110 | Florida Gas Transmission Co. | | Oil Operator | Dec 2007 |
| 111 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 112 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 113 | Foster-Brown Operations, Inc. | | Oil & Gas Operator | Apr 2003 |
| 114 | Freeport Oil Company | New Orleans, LA 70112 | Oil & Gas Operator | Oct 1979 |
| 115 | Gas Marketing, Inc. | Stafford, KS 67578 | Oil Operator | Mar 2007 |
| 116 | Gas Producing Enterprises, Inc. | | Oil & Gas Operator | Oct 1985 |
| 117 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 118 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 119 | Getty Reserve Oil Inc | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 120 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 121 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 122 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 123 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 124 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 125 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 126 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 127 | Gulf South Oil & Gas, Inc. | | Oil & Gas Operator | Feb 1990 |
| 128 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 129 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 130 | Haland Operating Company, LLC | | Oil & Gas Operator | Jul 2018 |
| 131 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Feb 2026 |
| 132 | Harcor Exploration Inc. | | Oil Operator | Aug 1989 |
| 133 | Henderson Petroleum Corp | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2013 |
| 134 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 135 | Highland Resources, Inc. | | Oil & Gas Operator | Dec 2004 |
| 136 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Feb 2026 |
| 137 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 138 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 139 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 140 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 141 | Hunt Industries, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2000 |
| 142 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 143 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 144 | Imc Exploration Co. | | Oil & Gas Operator | Oct 1986 |
| 145 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2026 |
| 146 | Indigo II Louisiana Operating LLC | | Oil & Gas Operator | Feb 2015 |
| 147 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 148 | Ingo Energy, LLC | | Oil & Gas Operator | Dec 2016 |
| 149 | Int'L Petr & Expl Opr Corp | | Oil & Gas Operator | Jan 2012 |
| 150 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2026 |
| 151 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 152 | J P Van Way | | Oil & Gas Operator | Dec 2024 |
| 153 | J. M. Huber Corp. | Houston, TX 77079 | Oil & Gas Operator | Sep 2004 |
| 154 | Jack W. Grigsby | | Oil & Gas Operator | Sep 2001 |
| 155 | Joe W. Elsbury | | Oil & Gas Operator | Oct 1988 |
| 156 | Jolen Operating Co Of La. | | Oil & Gas Operator | Dec 1993 |
| 157 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 158 | Kaiser Aluminum Exploration Co | | Oil & Gas Operator | Dec 1986 |
| 159 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 160 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 161 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 162 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jun 2007 |
| 163 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 164 | Lakeshore Petroleum Corp. | | Oil & Gas Operator | Dec 1992 |
| 165 | Lamar Hunt | | Oil & Gas Operator | Oct 2003 |
| 166 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 167 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 168 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 169 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 170 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 171 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 172 | LGS Exploration, Inc. | | Oil & Gas Operator | Jan 1991 |
| 173 | Liberty Oil & Gas Corp | Olney, IL 62450-2489 | Oil & Gas Operator | Dec 2021 |
| 174 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 175 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Feb 2026 |
| 176 | Longview Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2002 |
| 177 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 178 | Louisiana Resources Co | | Oil Operator | May 1992 |
| 179 | Luca Operation, LLC | | Oil & Gas Operator | Feb 2016 |
| 180 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | Feb 2026 |
| 181 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 182 | Marben Corporation | | Oil Operator | Jul 1995 |
| 183 | Martin Exploration Co. | | Oil & Gas Operator | Apr 1986 |
| 184 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 185 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 186 | McLain J. Forman | | Oil & Gas Operator | Mar 1988 |
| 187 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 188 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Feb 2026 |
| 189 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 190 | Minden Oil & Gas, Inc. | | Oil & Gas Operator | May 1985 |
| 191 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 192 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 193 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 194 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 195 | Murexco Petroleum Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 196 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 197 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 198 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Aug 2025 |
| 199 | New York Petroleum Corp. | | Oil & Gas Operator | Nov 1982 |
| 200 | Newport Operators, LLC | | Oil & Gas Operator | Jan 2019 |