| 101 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 102 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 103 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 104 | Co-St Oil Operating Co Inc | Enid, OK 73706 | Oil & Gas Operator | Apr 1997 |
| 105 | Cochran Industrial Corporation | Cushing, OK 74023-1427 | Oil & Gas Operator | Apr 2001 |
| 106 | Columbus Oil Company | Seminole, OK 74868 | Oil & Gas Operator | Jan 2026 |
| 107 | Combined Resources Corporation | Edmond, OK 73083 | Oil & Gas Operator | Mar 2026 |
| 108 | Compass Drilling Inc | Enid, OK 73702-5467 | Oil & Gas Operator | Sep 2014 |
| 109 | Compass Resources | Enid, OK 73702 | Oil & Gas Operator | Dec 2007 |
| 110 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 111 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 112 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2026 |
| 113 | Contango Resources LLC | Andrews, TX 79714 | Oil & Gas Operator | Mar 2026 |
| 114 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | Mar 2026 |
| 115 | Contreras Al Consultants Inc | Oklahoma City, OK 73113-0762 | Oil & Gas Operator | Oct 2020 |
| 116 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 117 | Cooper Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |
| 118 | Cordillera Energy Partners, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Mar 2020 |
| 119 | Corwin B V | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 120 | Crawley Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 121 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 122 | Cross Timbers Production Co | Oklahoma City, OK 73102-5605 | Oil & Gas Operator | Mar 2005 |
| 123 | Crown Central Pet Corp | Bellaire, TX 77401 | Oil & Gas Operator | Dec 2016 |
| 124 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Dec 2025 |
| 125 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 126 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 127 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 128 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 129 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Jan 2026 |
| 130 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Mar 2026 |
| 131 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 132 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Dec 2025 |
| 133 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | Mar 2026 |
| 134 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 135 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 136 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 137 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Dec 2025 |
| 138 | Davis Operating Company | Elysian Field, TX 75642 | Oil & Gas Operator | Mar 2026 |
| 139 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 140 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 141 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 142 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 143 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Jan 2026 |
| 144 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 145 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 146 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 147 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 148 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 149 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 150 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 151 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2026 |
| 152 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 153 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Jan 2026 |
| 154 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 155 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Jan 2026 |
| 156 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2026 |
| 157 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 158 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 159 | Eagle Energy Production LLC | Tulsa, OK 74136-1935 | Oil & Gas Operator | Mar 2020 |
| 160 | Eagle Exploration Production LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 161 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Mar 2026 |
| 162 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Dec 2025 |
| 163 | Eberle C Fred | Blackwell, OK 74631 | Oil Operator | Jun 1993 |
| 164 | Echo Production Inc | Graham, TX 76450 | Oil & Gas Operator | Mar 2026 |
| 165 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 166 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2026 |
| 167 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Dec 2025 |
| 168 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2026 |
| 169 | Energon Oil, Inc. | Amarillo, TX 79114 | Oil & Gas Operator | Mar 2026 |
| 170 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 171 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 172 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 173 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 174 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2026 |
| 175 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 176 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2026 |
| 177 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Sep 2025 |
| 178 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 179 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 180 | Falcon-Challenge Oil & Gas Co | Houston, TX 77056 | Oil & Gas Operator | Mar 1993 |
| 181 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2026 |
| 182 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Jan 2026 |
| 183 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 184 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Mar 2026 |
| 185 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 186 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 187 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 188 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Mar 2026 |
| 189 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 190 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 191 | Fuksa Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2026 |
| 192 | G A W Oil Company LLC | Enid, OK 73702-3926 | Oil & Gas Operator | Jan 2026 |
| 193 | Gem Oil Company | Albany, TX 76430 | Oil & Gas Operator | Sep 2002 |
| 194 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 195 | Geno Oil & Gas Corp | | Oil & Gas Operator | Sep 2009 |
| 196 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 197 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 198 | Geoquest Energy Inc | Enid, OK 73706-0216 | Oil & Gas Operator | Nov 2015 |
| 199 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 200 | Gill-Mac Inc | Nowata, OK 74048 | Oil & Gas Operator | May 1993 |