| 101 | Dean Enterprises, Inc. | | Oil & Gas Operator | Jun 2019 |
| 102 | Delta Energy Resources, Inc. | | Oil & Gas Operator | Jun 1990 |
| 103 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 104 | Denbury Resources Inc. | Plano, TX 75024 | Oil & Gas Operator | Dec 2003 |
| 105 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 106 | Dew Oil And Gas Co.,Inc. | | Oil & Gas Operator | Dec 1989 |
| 107 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 108 | Diamex Company | | Oil & Gas Operator | Oct 1982 |
| 109 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 110 | Dome De Sel LLC | | Oil & Gas Operator | Nov 2024 |
| 111 | Dragon Energy Corporation | | Oil & Gas Operator | Oct 2006 |
| 112 | Drew Cornell, Inc. | | Oil & Gas Operator | Jun 1992 |
| 113 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 114 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 115 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 116 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 117 | Eads Operating Company | | Oil & Gas Operator | Mar 1991 |
| 118 | Edgewater Oil Co. Inc. | | Oil & Gas Operator | Jul 1995 |
| 119 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 120 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 121 | Eidos Energy, Inc. | | Oil & Gas Operator | Oct 2017 |
| 122 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 123 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 124 | Enco Resources Inc. | Kingwood, TX 77325 | Oil & Gas Operator | Mar 2025 |
| 125 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Nov 2024 |
| 126 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 127 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 128 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Mar 2025 |
| 129 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 130 | Esquire Oil And Gas LLC | | Oil & Gas Operator | Jan 2011 |
| 131 | Exoro Energy, L.L.C. | | Oil & Gas Operator | Jun 2021 |
| 132 | Expando Production Co. | | Oil & Gas Operator | Oct 1988 |
| 133 | Fieldwood Energy Offshore LLC | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 134 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 135 | First Energy Development Corp. | | Oil & Gas Operator | Sep 2008 |
| 136 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Mar 2025 |
| 137 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 138 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 139 | Floyd Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 140 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 141 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 142 | Fontenot Pet Land Services, Inc. | | Oil & Gas Operator | Aug 2002 |
| 143 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 144 | Frank C. VInson | | Oil & Gas Operator | May 1995 |
| 145 | Freeport Oil Company | New Orleans, LA 70112 | Oil & Gas Operator | Oct 1979 |
| 146 | Future Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2010 |
| 147 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Mar 2025 |
| 148 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 149 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 150 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 151 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 152 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 153 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 154 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 155 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 156 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 157 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 158 | Great Southern - Joe Scates | | Oil Operator | Dec 1979 |
| 159 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 160 | Great Southern-Caddo-Lyons | | Oil & Gas Operator | Sep 1982 |
| 161 | Greystone Operating, Inc. | | Oil & Gas Operator | Nov 2009 |
| 162 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 163 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2012 |
| 164 | Gulf South Pipeline Company, LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2020 |
| 165 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 166 | Hawthorne Oil And Gas Corp. | Houston, TX 77227 | Oil & Gas Operator | Sep 1993 |
| 167 | HCW Exploration, Inc. | | Oil & Gas Operator | Jun 1986 |
| 168 | Henry Production Company, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2019 |
| 169 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Mar 2025 |
| 170 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 171 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Mar 2025 |
| 172 | Horizon Expl. & Dev. Co., Inc. | | Oil & Gas Operator | Jun 1995 |
| 173 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 174 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 175 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 176 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 177 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 178 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 179 | Hunter Oil & Gas, LLC | | Oil & Gas Operator | Oct 2001 |
| 180 | Iberia Operating Corporation | | Oil & Gas Operator | Jan 2003 |
| 181 | Indian Exploration, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Mar 2025 |
| 182 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 183 | Intercoast Oil And Gas Company | Tulsa, OK 74136 | Oil & Gas Operator | Jun 1997 |
| 184 | Iowa Production Company, Inc. | | Oil & Gas Operator | Jan 1992 |
| 185 | J & J Onshore Production, Inc. | | Oil & Gas Operator | Feb 2016 |
| 186 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | Mar 2025 |
| 187 | J. P. Van Way | | Oil & Gas Operator | Dec 2024 |
| 188 | J.A. Seglund,Inc. | | Oil & Gas Operator | May 1982 |
| 189 | Jack Corman | | Oil & Gas Operator | Jul 1981 |
| 190 | Jack W. Grigsby | | Oil & Gas Operator | Sep 2001 |
| 191 | Jake L. Hamon | | Oil & Gas Operator | Dec 1983 |
| 192 | James A. Whitson, Jr. | | Oil & Gas Operator | Apr 2016 |
| 193 | James M. Forgotson | | Oil & Gas Operator | Jan 1984 |
| 194 | JLS Investments | | Oil & Gas Operator | Mar 2002 |
| 195 | John W. McGowan | | Oil & Gas Operator | Jun 1991 |
| 196 | Jones Company | | Oil & Gas Operator | Dec 1990 |
| 197 | Jones Exploration Company | | Oil & Gas Operator | Jun 1985 |
| 198 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2018 |
| 199 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 200 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |