| 101 | Davis/Osage Corp | Tulsa, OK 74103 | Oil Operator | Jan 2001 |
| 102 | Davon Drilling Company | Oklahoma City, OK 73113-0665 | Oil & Gas Operator | Mar 2015 |
| 103 | Dawes, Tom E | | Oil Operator | Oct 2000 |
| 104 | Dawson Geophysical Company | Midland, TX 79701 | Oil Operator | Aug 2024 |
| 105 | Dawson Resources Inc | Franktown, CO 80116 | Oil & Gas Operator | Mar 2015 |
| 106 | Dawson, Levi S | | Oil & Gas Operator | Mar 2015 |
| 107 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Sep 2025 |
| 108 | Daxin Energy Corporation | Seminole, OK 74868-2208 | Oil Operator | Jan 2013 |
| 109 | Day Richard H | Wann, OK 74083-9608 | Oil Operator | Mar 2015 |
| 110 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 111 | DBS Oil Co /Osage Only | | Oil Operator | Jun 2025 |
| 112 | Dby Investments LLC | Lago VIsta, TX 78645-8011 | Oil & Gas Operator | Nov 2016 |
| 113 | DC Operating LLC | Yale, OK 74085-6662 | Oil & Gas Operator | Mar 2020 |
| 114 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Aug 2025 |
| 115 | DDC Oil LLC | Rockwall, TX 75087-5383 | Oil Operator | Mar 2020 |
| 116 | DDD Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2025 |
| 117 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Sep 2025 |
| 118 | Dead Horse Oil & Gas LLC | Skiatook, OK 74070-9343 | Oil & Gas Operator | Jun 2015 |
| 119 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Aug 2025 |
| 120 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 121 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 122 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 123 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 124 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 125 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 126 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 127 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 128 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Jun 2025 |
| 129 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Sep 2025 |
| 130 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Sep 2025 |
| 131 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 132 | Delek Energy Systems Us, Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 133 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 134 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Sep 2025 |
| 135 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 136 | Delong, Ralph S | | Oil & Gas Operator | Jun 2025 |
| 137 | Delphi Oil And Gas LLC | Macomb, OK 74852 | Oil Operator | May 2025 |
| 138 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 139 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 140 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 141 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Sep 2025 |
| 142 | Demco Oil & Gas Company | Blackwell, OK 74631-4203 | Oil & Gas Operator | Aug 2025 |
| 143 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 144 | Deminex U S Oil Company | | Oil & Gas Operator | Jan 1998 |
| 145 | Demo Oil Co | | Oil Operator | Jan 2020 |
| 146 | Dempsey, Wayne L | | Oil & Gas Operator | Mar 2011 |
| 147 | Denham Danny D | Kellyville, OK 74039 | Oil & Gas Operator | Aug 2025 |
| 148 | Denham Operating Company | Tulsa, OK 74101-3627 | Oil & Gas Operator | Aug 2022 |
| 149 | Dennett'S Inc | Enid, OK 73701-1851 | Oil & Gas Operator | Apr 2014 |
| 150 | Denney Don | Citrus Heights, CA 95611-2473 | Oil Operator | Aug 2023 |
| 151 | Dennis & Davis Oil Co. | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 152 | Dennis Don Oil Company | Grady, OK 73569-9998 | Oil Operator | Jan 2002 |
| 153 | Dennison George | Tulsa, OK 74112-6732 | Oil & Gas Operator | Apr 2020 |
| 154 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 155 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 156 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 157 | Derby Exploration LLC | Okc, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 158 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 159 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Aug 2025 |
| 160 | Des Oil Inc/Osage Only | | Oil Operator | Nov 1998 |
| 161 | Deshazo Production Company | Dewey, OK 74029-2811 | Oil & Gas Operator | Nov 2005 |
| 162 | Deshields Gary | Atwood, OK 74827 | Oil Operator | Aug 2025 |
| 163 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 164 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 165 | Dette Oil Corporation | Oklahoma City, OK 73162-6249 | Oil & Gas Operator | Oct 2015 |
| 166 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 167 | Devon Energy Operating Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2013 |
| 168 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 169 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 170 | Devon Resources Corporation | Jenks, OK 74037-3525 | Oil & Gas Operator | Aug 2025 |
| 171 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 172 | Dewey Energy GP LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2022 |
| 173 | Dewey Enterprises Inc | | Oil & Gas Operator | Aug 2025 |
| 174 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Aug 2025 |
| 175 | DFP Oil Company | Tulsa, OK 74114-1345 | Oil & Gas Operator | Dec 2004 |
| 176 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 177 | Diamond A Inc. | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2001 |
| 178 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 179 | Diamond Cross Oil Co LLC | Ponca City, OK 74601-1104 | Oil & Gas Operator | Aug 2025 |
| 180 | Diamond E Oil Company LLC | | Oil Operator | Apr 2025 |
| 181 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 182 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | Aug 2025 |
| 183 | Diamond Energy Services LLC | Tulsa, OK 74103-3862 | Oil & Gas Operator | Jan 2016 |
| 184 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Dec 2025 |
| 185 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Aug 2025 |
| 186 | Diamond M Operating LLC | Kinta, OK 74552 | Gas Operator | Aug 2025 |
| 187 | Diamond Production Company LLC | Irving, TX 75016-7853 | Oil & Gas Operator | Aug 2025 |
| 188 | Diamondback-Disposal LLC | Oklahoma City, OK 73134-1016 | Oil Operator | Dec 2008 |
| 189 | Diane Oil Company | Oklahoma City, OK 73146 | Oil & Gas Operator | Sep 2025 |
| 190 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 191 | Dickerson Dennis | Velma, OK 73491 | Oil Operator | Aug 2025 |
| 192 | Dickerson Oil | Ada, OK 74820 | Oil Operator | Jan 2025 |
| 193 | Diehl Mark | | Oil Operator | Nov 1998 |
| 194 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Sep 2025 |
| 195 | Dildine Oil Well Service | | Oil Operator | Apr 2011 |
| 196 | Dilley Corp | Yale, OK 74085 | Oil & Gas Operator | May 2013 |
| 197 | Dillingham Ranch LC | Tulsa, OK 74152 | Oil & Gas Operator | May 2013 |
| 198 | Dimock Petroleum | Dallas, TX 75205 | Oil Operator | Apr 2014 |
| 199 | Dinero Operating Co | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 200 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |