| 101 | Burkan Oil Company | Tulsa, OK 74137 | Oil & Gas Operator | Dec 1995 |
| 102 | Buxton Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Apr 2014 |
| 103 | C & J Trucks LLC | Seminole, OK 74868-5406 | Oil & Gas Operator | Mar 2026 |
| 104 | C & L Oil And Gas Corporation | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2026 |
| 105 | C Rose Oil Co. | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 106 | Cajeza Energy | Drumright, OK 74030 | Oil & Gas Operator | May 2013 |
| 107 | Cal-Tex Operating Co. | Manchaca, TX 78652 | Oil & Gas Operator | May 2020 |
| 108 | Calyx Energy LLC | Tulsa, OK 74146-3807 | Oil & Gas Operator | Feb 2020 |
| 109 | Canaan Energy Corporation | Oklahoma City, OK 73154-8806 | Oil & Gas Operator | Mar 2015 |
| 110 | Canvas Energy LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 111 | Capitol Well Servicing Co., Inc. | Oklahoma City, OK 73143 | Oil & Gas Operator | May 2023 |
| 112 | Capmac Inc | Tulsa, OK 74105-7119 | Oil & Gas Operator | Jan 2007 |
| 113 | Cardinal Oil LLC | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 114 | Carmac Energy Corporation | Dallas, TX 75219-2311 | Oil & Gas Operator | Feb 2026 |
| 115 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Feb 2026 |
| 116 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 117 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 118 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 119 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 120 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Jan 2026 |
| 121 | Cbo Oil And Gas, LLC | Stillwater, OK 74075-8793 | Oil & Gas Operator | Jan 2026 |
| 122 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2026 |
| 123 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 124 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 125 | Centurion Oilfield Services LLC | Burneyville, OK 73430 | Oil & Gas Operator | Jan 2026 |
| 126 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 127 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Feb 2026 |
| 128 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 129 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 130 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2026 |
| 131 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 132 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 133 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 134 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2026 |
| 135 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Apr 2026 |
| 136 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jan 2026 |
| 137 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Apr 2026 |
| 138 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 139 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 140 | CMS Energy Inc | Dallas, TX 75287 | Oil & Gas Operator | Jan 2026 |
| 141 | Coalinga Corporation | Houston, TX 77002 | Oil & Gas Operator | May 1999 |
| 142 | Coastal Oils Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2013 |
| 143 | Coleman Production | Stroud, OK 74079-9609 | Oil & Gas Operator | May 2013 |
| 144 | Colorado Gas Compression Inc | Longmont, CO 80501-5868 | Oil & Gas Operator | Aug 2013 |
| 145 | Columbia Production Company | Edmond, OK 73083 | Oil & Gas Operator | May 2020 |
| 146 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 147 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 148 | Confed Oil Incorporated | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 149 | Conn-Okla Producing Co Inc | | Oil & Gas Operator | Nov 1992 |
| 150 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 151 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 152 | Consolidated Peto Equity LTD | La Crescenta, CA 91214 | Oil & Gas Operator | Dec 1996 |
| 153 | Consolidated Production Inc. | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 154 | Consolidated Properties | Tulsa, OK 74129 | Oil & Gas Operator | Jan 2017 |
| 155 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Apr 2026 |
| 156 | Continental Oil & Refining Co | Catoosa, OK 74015-0831 | Oil & Gas Operator | Feb 2026 |
| 157 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Apr 2026 |
| 158 | Cooke County Production Company | Shawnee, OK 74801-1800 | Oil & Gas Operator | Jan 2022 |
| 159 | Cooper Mineral Group Inc | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2004 |
| 160 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 161 | Cougar Energy Investment LLC | Spring, TX 77387-7277 | Oil & Gas Operator | Sep 2014 |
| 162 | Covington Oil Company Inc | Nichols Hills, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 163 | CP Energy, LLC | Edmond, OK 73034 | Oil Operator | Jul 2025 |
| 164 | Craig Elder Oil And Gas LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 165 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 166 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Feb 2026 |
| 167 | Crude Resources | Sapulpa, OK 74066 | Oil & Gas Operator | Mar 2008 |
| 168 | Cudd Operating Corp | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 169 | Culp & Copple Oil Company | Cushing, OK 74023 | Oil & Gas Operator | Feb 2026 |
| 170 | Cumberland Operating Company | Seminole, OK 74868-1258 | Oil & Gas Operator | Mar 2007 |
| 171 | CVR Supply & Trading, LLC | Sugar Land, TX 77479 | Oil & Gas Operator | Apr 2024 |
| 172 | CW Investments | Okmulgee, OK 74447-4026 | Oil & Gas Operator | Nov 2025 |
| 173 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 174 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 175 | D & J Tank Trucks Inc | Drumright, OK 74030 | Oil Operator | Feb 2026 |
| 176 | D & M Production Co Inc | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 177 | Danick Operating USA Inc | McKinney, TX 75072-9071 | Oil & Gas Operator | Oct 2022 |
| 178 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 179 | Daube Company The | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2026 |
| 180 | Daube Exploration Company | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2020 |
| 181 | David Ridley Oil LLC | Tecumseh, OK 74873 | Oil Operator | Feb 2026 |
| 182 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 183 | Davis Jared | Wann, OK 74083-9610 | Oil & Gas Operator | Jan 2026 |
| 184 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2026 |
| 185 | DC Operating LLC | Yale, OK 74085-6662 | Oil & Gas Operator | Mar 2020 |
| 186 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 187 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 188 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 189 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Jan 2026 |
| 190 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 191 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 192 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 193 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2026 |
| 194 | Deshazo Production Company | Dewey, OK 74029-2811 | Oil & Gas Operator | Nov 2005 |
| 195 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 196 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 197 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Feb 2026 |
| 198 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Feb 2026 |
| 199 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 200 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |