| 101 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 102 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Mar 2025 |
| 103 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 104 | Cippele Resources Co. | Longview, TX 75608 | Oil & Gas Operator | May 1994 |
| 105 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 106 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 107 | Claron Corporation | Houston, TX 77219 | Oil & Gas Operator | Mar 2025 |
| 108 | Classic Energy Incorporated | Tyler, TX 75701 | Oil & Gas Operator | Jul 2005 |
| 109 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 110 | Classic Operating Co. LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 111 | Clemons, Tony W. | Minden, LA 71055 | Oil & Gas Operator | Dec 2016 |
| 112 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Mar 2025 |
| 113 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 114 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 115 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Nov 2024 |
| 116 | Colorado-Swanson Landing Oil & Gas, LLC | Kilgore, TX 75663 | Oil Operator | Mar 2025 |
| 117 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 118 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 119 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 120 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Mar 2025 |
| 121 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 122 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 123 | Conquest Energy, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 124 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 125 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | Mar 2025 |
| 126 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 127 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 128 | Cotton Valley Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2000 |
| 129 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Mar 2025 |
| 130 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 131 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 132 | Cove Petroleum Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2020 |
| 133 | Covey Park Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Aug 2019 |
| 134 | Covey Park Resources LLC | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 135 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Mar 2025 |
| 136 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 137 | CR2 Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 138 | Craton Energy Company II LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2006 |
| 139 | Craton Energy Holdings III, LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2009 |
| 140 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2025 |
| 141 | CRD Operating, LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Feb 2021 |
| 142 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Mar 2025 |
| 143 | Cross Creek Energy LLC | Houston, TX 77074 | Oil & Gas Operator | Aug 2013 |
| 144 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 145 | Crosspoint Energy Company | Dallas, TX 75205 | Oil & Gas Operator | Oct 2007 |
| 146 | Crow, David | Shreveport, LA 71106 | Oil & Gas Operator | May 2001 |
| 147 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 148 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2025 |
| 149 | D & W Trucking Company | De Berry, TX 75639 | Oil Operator | Mar 2003 |
| 150 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 151 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 152 | Dallas Operating Corp. | Dallas, TX 75205 | Oil & Gas Operator | Nov 2006 |
| 153 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 154 | Danmark Energy Services, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Apr 2021 |
| 155 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Mar 2025 |
| 156 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 157 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 158 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 159 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 160 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2025 |
| 161 | DJD Drilling Corporation | Graham, TX 76450 | Oil Operator | Jan 2010 |
| 162 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 163 | Dolberry Energy Resources Corp. | Dallas, TX 75252 | Oil Operator | Mar 2025 |
| 164 | Dominion Natural Resources LLC | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 165 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 166 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |
| 167 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 168 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 169 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Mar 2025 |
| 170 | East Texas Exploration, LLC | Edmond, OK 73003 | Oil & Gas Operator | Sep 2019 |
| 171 | Eastex Operating, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2003 |
| 172 | Edmonds, Karl F. Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2005 |
| 173 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 174 | Eex E&P Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jul 2003 |
| 175 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 176 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 177 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 178 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 179 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 180 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 181 | Endurance Oil & Gas, Inc. | Minden, LA 71055 | Oil & Gas Operator | Mar 2025 |
| 182 | Energy Equity Company | Columbus, MT 59019 | Oil & Gas Operator | Jan 2025 |
| 183 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Dec 2024 |
| 184 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2024 |
| 185 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 186 | Enpower Resources Inc. | Sugar Land, TX 77479 | Oil & Gas Operator | Mar 2025 |
| 187 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 188 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 189 | Ensight Energy Management, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2005 |
| 190 | Ensight III Energy MGMT, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2008 |
| 191 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 192 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 193 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 194 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 195 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 196 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 197 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 198 | Etopsi Oil And Gas, L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 199 | Etos Operating, Inc. | New London, TX 75682 | Oil & Gas Operator | Mar 2025 |
| 200 | Evergreen Operating Co., LTD. | McAllen, TX 78502 | Oil & Gas Operator | Mar 2025 |