| 101 | Can Do Enterprises | | Oil Operator | Dec 2024 |
| 102 | Canada Crown Inv Corporation | | Oil & Gas Operator | Apr 1998 |
| 103 | Candice Venture #1 | | Oil & Gas Operator | May 1992 |
| 104 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 105 | Cankton Oil Company | | Oil Operator | May 1985 |
| 106 | Canlan Oil Company | | Oil & Gas Operator | Mar 1992 |
| 107 | Cannon Operating Company LLC | Garland, TX 75043 | Oil Operator | Mar 2025 |
| 108 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 109 | Cantium, LLC | | Oil & Gas Operator | Dec 2024 |
| 110 | Cap Production | | Oil Operator | Dec 2024 |
| 111 | Capital Gas, Inc. | | Gas Operator | Jan 1998 |
| 112 | Capturepoint LLC | Allen, TX 75013 | Oil & Gas Operator | Mar 2025 |
| 113 | Car-Tex Producing Company | | Oil & Gas Operator | Dec 1994 |
| 114 | Carder Oil Company | | Oil & Gas Operator | Dec 2024 |
| 115 | Cardinal Expl And Prod | | Oil & Gas Operator | May 2019 |
| 116 | Cardinal Oil & Gas, Inc. | | Oil & Gas Operator | Jun 1995 |
| 117 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 118 | Cardinal Petroleum Corp Of La | | Oil Operator | May 2003 |
| 119 | Cardneaux Inc. | | Oil & Gas Operator | Aug 2009 |
| 120 | Cargas Operating Company | | Oil & Gas Operator | Dec 2024 |
| 121 | Caribbean Oil & Gas Corp | | Oil & Gas Operator | Mar 1980 |
| 122 | Caribe Resources, Inc. | | Oil & Gas Operator | Jan 1985 |
| 123 | Carl E. Hansford | | Oil Operator | Oct 1980 |
| 124 | Carl Oil & Gas Co. | Bakersfield, CA 93309 | Oil & Gas Operator | Dec 1995 |
| 125 | Carl Oil & Gas Co.-CNG | | Oil & Gas Operator | Dec 1995 |
| 126 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 127 | Carl W Jones Et Al | | Oil & Gas Operator | Jul 1995 |
| 128 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 129 | Carmet Oil, Inc. | | Oil & Gas Operator | Dec 1990 |
| 130 | Caroline Hunt Schoellkopf | | Oil & Gas Operator | Aug 1987 |
| 131 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 132 | Carr Petroleum, Inc. | | Oil Operator | Apr 1987 |
| 133 | Carraway Co. | | Oil Operator | Apr 2006 |
| 134 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 135 | Carrollton Resources Corp. | | Oil & Gas Operator | Sep 2000 |
| 136 | Carter & Rorex | | Oil Operator | Dec 1991 |
| 137 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 138 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 139 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 140 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 141 | Cashco Energy Corporation | | Oil & Gas Operator | Feb 1982 |
| 142 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 143 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2025 |
| 144 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 145 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 146 | Castex Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 147 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 148 | Castlerock Oil Company, Inc. | Addison, TX 75001 | Oil & Gas Operator | Feb 2006 |
| 149 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 150 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 151 | Cat-Oil Inc. | | Oil Operator | Nov 2015 |
| 152 | Cathexis Oil & Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2014 |
| 153 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 154 | Catlett & Ferguson-Carl O & G | | Oil & Gas Operator | Jun 1978 |
| 155 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 156 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 157 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 158 | Cavenham Energy Resrces Inc JV | | Oil Operator | Mar 1991 |
| 159 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 160 | Cavenham Forest Ind., Inc. J V | | Oil Operator | Nov 1987 |
| 161 | Cayman Exploration Corp. | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 162 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 163 | Caza Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 164 | Cecil Brand | | Oil & Gas Operator | Mar 2002 |
| 165 | Cedar Creek Consulting Inc | | Oil Operator | Jan 2025 |
| 166 | Cedyco Corporation | Houston, TX 77227 | Oil & Gas Operator | Nov 2008 |
| 167 | Cei Production Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 1998 |
| 168 | Ceka Gas, Div Of GTC | | Oil & Gas Operator | May 1988 |
| 169 | Cel Properties LLC | | Oil & Gas Operator | Jan 2025 |
| 170 | Celeron Oil & Gas Company | | Oil & Gas Operator | Dec 1987 |
| 171 | Celt Oil, Inc. | | Oil & Gas Operator | Jun 1986 |
| 172 | Cenco, Inc. | | Oil & Gas Operator | Mar 2022 |
| 173 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 174 | Cenla Oil Company, LLC | | Oil Operator | Dec 2024 |
| 175 | Centennial Exploration, Inc. | | Oil & Gas Operator | Dec 1985 |
| 176 | Centergate Resources LLC | | Oil & Gas Operator | Dec 2024 |
| 177 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 178 | Central Crude, Inc. | | Oil & Gas Operator | Jul 2014 |
| 179 | Central Min Oper Co, Inc. | | Gas Operator | Mar 1994 |
| 180 | Central Mineral Management Inc | | Oil & Gas Operator | Jul 1990 |
| 181 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 182 | Centura Inc | | Oil & Gas Operator | Feb 1985 |
| 183 | Centurion Exploration Company | Houston, TX 77042 | Oil & Gas Operator | May 2009 |
| 184 | Century Energy, Inc. | | Oil & Gas Operator | Aug 1989 |
| 185 | Century Exploration Company | | Oil & Gas Operator | Dec 2003 |
| 186 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 187 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 188 | Century Exploration N.O. LLC | | Oil & Gas Operator | Jun 2017 |
| 189 | Century Exploration N.O., Inc. | | Oil & Gas Operator | Sep 2011 |
| 190 | Century Mineral Corporation | | Oil & Gas Operator | Dec 1990 |
| 191 | Century Offshore MGMT. Corp. | | Oil & Gas Operator | Dec 1999 |
| 192 | Century Oil, Inc. | | Oil Operator | Apr 2022 |
| 193 | Cerro Oil Co., Inc. | | Oil Operator | Dec 1987 |
| 194 | Chadco, Inc. | | Oil Operator | Dec 2024 |
| 195 | Chain Oil & Gas, Inc. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 196 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 197 | Chambers Exploration Inc. | | Oil & Gas Operator | Dec 1986 |
| 198 | Champ Operating Company | Dallas, TX 75208 | Oil & Gas Operator | Oct 2020 |
| 199 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 200 | Channel Exploration Company | | Oil & Gas Operator | Feb 1997 |