| 101 | Camino Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 102 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 103 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 104 | Canyon Exploration Co. | Amarillo, TX 79105 | Oil & Gas Operator | Oct 2025 |
| 105 | Capstone Oilfield Disposal Service LLC | Hennessey, OK 73742 | Oil Operator | Dec 2019 |
| 106 | Carlson Petroleum Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 107 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Nov 2025 |
| 108 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 109 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Jan 2026 |
| 110 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 111 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 112 | Chapman Resources Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 1999 |
| 113 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 114 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 115 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Dec 2025 |
| 116 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 117 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 118 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 119 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 120 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Nov 2025 |
| 121 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Nov 2025 |
| 122 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 123 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 124 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 125 | Coaleum Corporation | Dallas, TX 75205 | Oil & Gas Operator | Jan 2001 |
| 126 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 127 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 128 | Coenergy Operating Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2015 |
| 129 | Collet Oil Ventures Inc | Denver, CO 80217 | Oil & Gas Operator | Jun 2004 |
| 130 | Collier Petroleum Corporation | Taloga, OK 73667-9644 | Oil & Gas Operator | Jan 2013 |
| 131 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 132 | Comanche Exploration Company | Oklahoma City, OK 73120-2797 | Oil & Gas Operator | Feb 2007 |
| 133 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 134 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 135 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 136 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 137 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 138 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 139 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Feb 2026 |
| 140 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Nov 2024 |
| 141 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 142 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 143 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 144 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 145 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | Feb 2026 |
| 146 | Corman, Jack | Dallas, TX 75231 | Oil & Gas Operator | May 2022 |
| 147 | Cory, Kenneth W. | Bellaire, TX 77401 | Oil & Gas Operator | Mar 2012 |
| 148 | Coterra Energy Operating Co. | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 149 | Couroil, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2000 |
| 150 | Courson Oil & Gas, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Feb 2026 |
| 151 | Covington & Covington | | Gas Operator | Nov 2000 |
| 152 | Cox Oil & Gas Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2014 |
| 153 | Cox, John L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 154 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 155 | Crescendo Resources, L.P. | Amarillo, TX 79188 | Oil & Gas Operator | Nov 2025 |
| 156 | Cross Timbers Oil Company | Dallas, TX 75284 | Oil & Gas Operator | May 2013 |
| 157 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 158 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 159 | Crusader Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2011 |
| 160 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 161 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 162 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 163 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 164 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Dec 2025 |
| 165 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Nov 2025 |
| 166 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 167 | Dab Limited | Oklahoma City, OK 73116-9082 | Oil & Gas Operator | Aug 2013 |
| 168 | Dalen Resources Oil & Gas Co | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 169 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 170 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 171 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Nov 2025 |
| 172 | Davis & Davis | | Oil & Gas Operator | Dec 2021 |
| 173 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Feb 2026 |
| 174 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 175 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 176 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 177 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 178 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 179 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 180 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Nov 2025 |
| 181 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 182 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 183 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 184 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 185 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 186 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 187 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 188 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 189 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 190 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 191 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 192 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 193 | Dorchester Resources LP | Oklahoma City, OK 73154-8879 | Oil & Gas Operator | Aug 2021 |
| 194 | Double "C" Energy | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 195 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 196 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 197 | Dragon Energy LLC | Tulsa, OK 74135-7234 | Oil & Gas Operator | Feb 2015 |
| 198 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 199 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 200 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Dec 2025 |