| 101 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 102 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 103 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 104 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 105 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 106 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 107 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 108 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 109 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 110 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 111 | Columbus Oil Company | Seminole, OK 74818-1111 | Oil & Gas Operator | Jan 2024 |
| 112 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2024 |
| 113 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 114 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 115 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 116 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 117 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 118 | Contango Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 119 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Apr 2024 |
| 120 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 121 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 122 | Cooper Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 123 | Cordillera Energy Partners LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 124 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 125 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 126 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2023 |
| 127 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 128 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 129 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2024 |
| 130 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 131 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 132 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 133 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 134 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 135 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Jan 2024 |
| 136 | D & B Operating LLC | | Oil Operator | Jan 2023 |
| 137 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Apr 2024 |
| 138 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 139 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Dec 2023 |
| 140 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Apr 2024 |
| 141 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2024 |
| 142 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 143 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 144 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 145 | Darling Oil Corporation | Lamont, OK 74643-0158 | Oil & Gas Operator | Dec 2023 |
| 146 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Apr 2024 |
| 147 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 148 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 149 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 150 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 151 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Jan 2024 |
| 152 | Denell Oil Corporation | Yukon, OK 73085 | Oil & Gas Operator | Jul 1994 |
| 153 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 154 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 155 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 156 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 157 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 158 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 159 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 160 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 161 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 162 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Dec 2023 |
| 163 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 164 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Jan 2024 |
| 165 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 166 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 167 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 168 | Eagle Energy Production LLC | | Oil & Gas Operator | Mar 2020 |
| 169 | Eagle Exploration Production LLC | | Oil & Gas Operator | Jan 2024 |
| 170 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 171 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Dec 2023 |
| 172 | Eberle C Fred | Blackwell, OK 74631 | Oil Operator | Jun 1993 |
| 173 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 174 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 175 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2024 |
| 176 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 177 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Apr 2024 |
| 178 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 179 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 180 | Equal Energy Us Inc | | Oil & Gas Operator | Nov 2019 |
| 181 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 182 | Evolution Energy LLC | | Oil & Gas Operator | Dec 2023 |
| 183 | Exok, Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2023 |
| 184 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 185 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2024 |
| 186 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 187 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 188 | Falcon-Challenge Oil & Gas Co | Houston, TX 77056 | Oil & Gas Operator | Mar 1993 |
| 189 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 190 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2024 |
| 191 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 192 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 193 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2024 |
| 194 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 195 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 196 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 197 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 198 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 199 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 200 | Fuksa Investments Inc | Hennessey, OK 73742-0291 | Oil & Gas Operator | Jan 2024 |