| 101 | Cox Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 102 | Crosstex Lig, LLC | | Oil Operator | Mar 2014 |
| 103 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 104 | CX Operating, Inc. | | Oil & Gas Operator | Oct 2023 |
| 105 | Cypress Gas Pipeline Company | | Oil Operator | Dec 1998 |
| 106 | Cypress Gas Pipeline, LLC | | Oil Operator | Sep 2019 |
| 107 | D & C Operating, Inc. | | Oil & Gas Operator | Apr 1999 |
| 108 | D90 Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Nov 2024 |
| 109 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 110 | Daniel Oil Company | | Oil & Gas Operator | Jan 1983 |
| 111 | Davis Oil Company | Pawhuska, OK 74056 | Oil & Gas Operator | Jun 2018 |
| 112 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Nov 2024 |
| 113 | Delmar Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 1996 |
| 114 | Delta Royalties LLC | | Oil & Gas Operator | Jun 2024 |
| 115 | Denbury Management, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 1999 |
| 116 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 117 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2024 |
| 118 | Dew Oil And Gas Co.,Inc. | | Oil & Gas Operator | Dec 1989 |
| 119 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 120 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Jul 2024 |
| 121 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 122 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 123 | Douglas Edwards | | Oil Operator | Nov 1993 |
| 124 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 125 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 126 | E. A. Courtney | | Oil & Gas Operator | Oct 1978 |
| 127 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2024 |
| 128 | Edgewood Exploration Inc. | | Oil & Gas Operator | Mar 1993 |
| 129 | Edward Oil Company | Youngsville, PA 16371 | Oil & Gas Operator | May 2024 |
| 130 | Edwin L. Cox | | Oil & Gas Operator | May 1986 |
| 131 | Edwin L. Cox & Berry R. Cox | | Oil & Gas Operator | Jun 1986 |
| 132 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 133 | Elf Aquitaine Operating, Inc. | | Oil & Gas Operator | Jan 1992 |
| 134 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 135 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 136 | Elysium Jennings, LLC | | Oil & Gas Operator | Jun 2024 |
| 137 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 138 | Energy Corp. Of America, Inc. | | Oil & Gas Operator | Aug 1998 |
| 139 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 140 | Energy Management Corp. | | Oil & Gas Operator | Apr 1999 |
| 141 | Energy Partners, LTD. | New Orleans, LA 70170 | Oil & Gas Operator | Aug 2012 |
| 142 | Energy Properties Inc. | | Oil & Gas Operator | Dec 2023 |
| 143 | Energy Reserves Group | Houston, TX 770563020 | Oil & Gas Operator | Apr 1996 |
| 144 | Energy Sources, Inc. | | Oil & Gas Operator | Nov 1990 |
| 145 | Energy Xxi Gom, LLC | | Oil & Gas Operator | Dec 2023 |
| 146 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 147 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Aug 2024 |
| 148 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 149 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 150 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 151 | Enstar Petroleum Company | | Oil & Gas Operator | Jul 1985 |
| 152 | Enstar Petroleum Inc | | Oil & Gas Operator | Apr 1985 |
| 153 | Entex Petroleum, Inc. | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 1997 |
| 154 | Entex, Inc. | | Oil & Gas Operator | Dec 1984 |
| 155 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 156 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Jul 2024 |
| 157 | Equitable Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 158 | Erskine Energy, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Nov 2024 |
| 159 | Evangeline Natural Resources, LLC | | Oil & Gas Operator | Jun 2024 |
| 160 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 161 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Nov 2024 |
| 162 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 163 | Fieldwood Onshore LLC | Houston, TX 77098 | Oil & Gas Operator | Nov 2024 |
| 164 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 165 | Finaly Resources LLC | Sunset Beach, CA 90742 | Oil & Gas Operator | Nov 2024 |
| 166 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Nov 2024 |
| 167 | Flash Gas & Oil Northeast, Inc | | Oil & Gas Operator | May 2007 |
| 168 | Flash Gas & Oil Southwest, Inc. | Mandeville, LA 70470 | Oil & Gas Operator | Oct 2019 |
| 169 | Florida Exploration Co | Aurora, CO 80014 | Oil & Gas Operator | Sep 1989 |
| 170 | Floyd Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1999 |
| 171 | Flynn Energy Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Mar 1993 |
| 172 | FMP Operating Co., LTD. PTN. | | Oil & Gas Operator | Mar 1990 |
| 173 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 174 | Forman Exploration Company | | Oil & Gas Operator | Oct 1988 |
| 175 | Forman Petroleum Corporation | | Oil & Gas Operator | Aug 2001 |
| 176 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2024 |
| 177 | Foster-Brown Operations, Inc. | | Oil & Gas Operator | Apr 2003 |
| 178 | Franks Petroleum Inc. | | Oil & Gas Operator | Nov 1994 |
| 179 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 180 | Future Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2010 |
| 181 | Gene McCutchin | | Gas Operator | Aug 1999 |
| 182 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 183 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 184 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 185 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 186 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 187 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 188 | Getty Reserve Oil, Inc. | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 189 | Glassell Producing Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 190 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 191 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 192 | Good Shepard Resources, L.L.C. | | Gas Operator | Jul 2024 |
| 193 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 194 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 195 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 196 | Graham Oil And Gas, LTD. | Covington, LA 70434-3134 | Oil & Gas Operator | Aug 2013 |
| 197 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 198 | Graham-McCormick Oper. PRTSHP. | | Oil & Gas Operator | Aug 1989 |
| 199 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 200 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |