| 101 | Enstar Petroleum Company | | Oil & Gas Operator | Aug 1985 |
| 102 | Enterprise Resources Inc. | | Oil & Gas Operator | Jun 1979 |
| 103 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 104 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 105 | Est Of WM G Helis (A Partnership) | | Oil & Gas Operator | Dec 2009 |
| 106 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 107 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 108 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 109 | Fieldwood Energy Offshore LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 110 | Five States Energy Company | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 111 | Five States Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Feb 2008 |
| 112 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 113 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 114 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 115 | Fontenot Pet Land Services, Inc. | | Oil & Gas Operator | Aug 2002 |
| 116 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 117 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 118 | Four Seasons, Inc. | | Oil & Gas Operator | Jun 1983 |
| 119 | Frank Spooner | | Oil & Gas Operator | Mar 1984 |
| 120 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 121 | French Production Incorporated | Houston, TX 77086 | Oil & Gas Operator | Dec 1997 |
| 122 | Gap Energy, Inc. | | Oil & Gas Operator | Oct 1995 |
| 123 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 124 | Ginger Oil Company | | Oil & Gas Operator | Jun 2015 |
| 125 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 126 | Goodrich Drillers, LLC | | Oil & Gas Operator | Nov 2014 |
| 127 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 128 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 129 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 130 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 131 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 132 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 133 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 134 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Feb 2025 |
| 135 | H.L.Hawkins &H.L.Hawkins, Jr. | | Oil & Gas Operator | Feb 1989 |
| 136 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 137 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 138 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Oct 2025 |
| 139 | Hanvey Production Co., Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Nov 2012 |
| 140 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 141 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 142 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 143 | Henderson Petroleum Corp | San Angelo, TX 76906 | Oil & Gas Operator | Jul 2013 |
| 144 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 145 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 146 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 147 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 148 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 149 | Hy-Mark Oil & Gas, Inc. | | Oil Operator | Mar 1991 |
| 150 | Imperial-American Energy,Inc. | | Oil & Gas Operator | Jul 1978 |
| 151 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2025 |
| 152 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 153 | J. E. Farrell | | Gas Operator | Nov 1990 |
| 154 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 155 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 156 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 157 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 158 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 159 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 160 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 161 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 162 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 163 | La Intrastate Gas Co LLC | | Oil Operator | Apr 2004 |
| 164 | La. Land & Expl. Co. | | Oil & Gas Operator | Dec 2010 |
| 165 | La. Mining & Minerals, Inc. | | Oil & Gas Operator | Jul 2000 |
| 166 | Labelle Petroleum, Inc. | | Oil & Gas Operator | Oct 1990 |
| 167 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 168 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 169 | Las Services, Inc. | | Oil & Gas Operator | Oct 1997 |
| 170 | Lea Exploration, Inc. | | Oil & Gas Operator | Nov 1989 |
| 171 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 172 | Legacy Resources Co., L.P. | | Oil & Gas Operator | Apr 2019 |
| 173 | Liberty Resources, Inc. | | Oil & Gas Operator | Dec 2024 |
| 174 | Linder Oil Company,A Partnership | Shreveport, LA 71136 | Oil & Gas Operator | Oct 2025 |
| 175 | Llog Expl. Co. | Metairie, LA 70005 | Oil & Gas Operator | Jan 2003 |
| 176 | Llog Exploration Company, L.L.C. | | Oil & Gas Operator | Jun 2025 |
| 177 | Louisiana Crude Oil&Gas Co Inc | | Oil & Gas Operator | Mar 1984 |
| 178 | Louisiana Intrastate Gas Corp. | | Oil Operator | Feb 1994 |
| 179 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 180 | M & R Exploration Company | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 181 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Oct 2025 |
| 182 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 183 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 184 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 185 | Matrix Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2001 |
| 186 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 187 | McCord Exploration Co. | | Oil & Gas Operator | Dec 1990 |
| 188 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 189 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 190 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 191 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 192 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 193 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 194 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 195 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 196 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 197 | Mobil E&P North America Inc. | | Oil & Gas Operator | Jan 1994 |
| 198 | National Offshore LP | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 199 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 200 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |