| 101 | Coastline Operating, L.L.C. | Houston, TX 77027 | Oil & Gas Operator | Dec 2006 |
| 102 | Cobbs Brothers Oil & Gas | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Jun 2009 |
| 103 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2024 |
| 104 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 105 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 106 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 107 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 108 | Concord Operating Incorporated | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2008 |
| 109 | Continental Trend Resources, Inc | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 110 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 111 | Cook Marshall Operating, Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 1995 |
| 112 | Core E & P Corp. | Victoria, TX 77902 | Oil & Gas Operator | Apr 2024 |
| 113 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 114 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 115 | Cougar Oil & Gas Co., Inc. | Houston, TX 77269 | Oil & Gas Operator | Mar 2008 |
| 116 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 117 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2024 |
| 118 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 119 | Crossroads Petroleum L.L.C. | San Benito, TX 78586 | Oil & Gas Operator | Apr 2024 |
| 120 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 121 | Crystal River Oil & Gas LLC | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2023 |
| 122 | CTR Petroleum, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Mar 2015 |
| 123 | Cummins & Walker Oil Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Jan 2021 |
| 124 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 125 | D&H-S-S Production Co.,Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Aug 2003 |
| 126 | Dahco Operating, LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2024 |
| 127 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2019 |
| 128 | Dalport Oil Corporation | Dallas, TX 75202 | Oil & Gas Operator | Apr 1993 |
| 129 | Davis Gulf Coast, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2024 |
| 130 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Apr 2024 |
| 131 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jan 2024 |
| 132 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Apr 2024 |
| 133 | Deguello Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 134 | Del Mar Exploration Company | Houston, TX 77006 | Oil & Gas Operator | Jan 2014 |
| 135 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 136 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 137 | Denovo Oil & Gas, Inc. | Houston, TX 77210 | Oil & Gas Operator | May 1995 |
| 138 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 139 | Devon Gas Services LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 140 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 141 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 142 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Feb 2024 |
| 143 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 144 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 145 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2014 |
| 146 | Double Play Oil & Gas | Portland, TX 78374 | Oil & Gas Operator | Dec 2001 |
| 147 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Apr 2024 |
| 148 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 149 | Durango Resources Corp | Houston, TX 77043 | Oil & Gas Operator | Apr 2024 |
| 150 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 151 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 152 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 153 | El Paso Field Services Company | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 154 | Eldon Oil Co. | Three Rivers, TX 78071 | Oil & Gas Operator | Apr 2024 |
| 155 | Electragas, Inc. | Houston, TX 77064 | Oil Operator | Apr 2024 |
| 156 | Ellsworth, H. P. O&G Properties | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2024 |
| 157 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Apr 2024 |
| 158 | Enerfin Field Services LLC | Houston, TX 77077 | Oil Operator | Dec 2023 |
| 159 | Energy Acquisitions, Inc. | Spring, TX 77379 | Oil & Gas Operator | Apr 1996 |
| 160 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 161 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 162 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 163 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 164 | Esenjay Petroleum Corp. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jul 1998 |
| 165 | Evans, Julian | Houston, TX 77024 | Oil & Gas Operator | Nov 1995 |
| 166 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 167 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 168 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Apr 2024 |
| 169 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Apr 2024 |
| 170 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 171 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2024 |
| 172 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2023 |
| 173 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 174 | Ferreira Oil Properties LLC | Carefree, AZ 85377 | Oil Operator | Apr 2014 |
| 175 | Fesco, LTD. | Alice, TX 78332 | Oil Operator | Apr 2024 |
| 176 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 177 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2024 |
| 178 | Firstrike Energy Corporation | Cleburne, TX 76033 | Oil & Gas Operator | Apr 2024 |
| 179 | Fischer Operating Corporation | Victoria, TX 77902 | Oil & Gas Operator | Jan 1999 |
| 180 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2024 |
| 181 | Flournoy Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 182 | Flournoy Production Co. | Alice, TX 78333 | Oil & Gas Operator | Dec 2002 |
| 183 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Apr 2024 |
| 184 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 2024 |
| 185 | Fox, Hewitt B., Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Apr 2024 |
| 186 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 187 | Frio Exploration Company | Pearland, TX 77588 | Oil & Gas Operator | Dec 2000 |
| 188 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 189 | Gary Oil & Gas | Deer Park, TX 77536 | Oil & Gas Operator | Apr 2024 |
| 190 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Apr 2024 |
| 191 | Gcea, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 192 | Geiser Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2019 |
| 193 | Geiser, D. Allen | Portland, TX 78374 | Oil & Gas Operator | Oct 2005 |
| 194 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 195 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 196 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 197 | Gierhart Exploration, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 1994 |
| 198 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 199 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 200 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |