| 201 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 202 | Culebra Oil & Gas, LLC | Kerrville, TX 78028 | Oil & Gas Operator | Dec 2025 |
| 203 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Oct 2025 |
| 204 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Oct 2025 |
| 205 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 206 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 207 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 208 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Dec 2025 |
| 209 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 210 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Oct 2025 |
| 211 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 212 | Dakota Exploration LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 213 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 214 | Dance Oil Co | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 215 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 216 | Darden Energy Corp | Hennessey, OK 73742 | Oil & Gas Operator | Jul 1999 |
| 217 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 218 | Darling Oil Corporation | Lamont, OK 74643 | Oil & Gas Operator | Oct 2025 |
| 219 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Oct 2025 |
| 220 | Dart Oil Properties | Enid, OK 73703 | Oil & Gas Operator | Oct 1992 |
| 221 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Oct 2025 |
| 222 | Davidson Energy Inc | Perry, OK 73077 | Oil & Gas Operator | Oct 2025 |
| 223 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 224 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Oct 2025 |
| 225 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 226 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 227 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 228 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 229 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 230 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Oct 2025 |
| 231 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 232 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Oct 2025 |
| 233 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 234 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 235 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Sep 2025 |
| 236 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 237 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 238 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 239 | Dewey Energy GP LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2022 |
| 240 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Aug 2025 |
| 241 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 242 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 243 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Dec 2025 |
| 244 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 245 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 246 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 247 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 248 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 249 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 250 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Oct 2025 |
| 251 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 252 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 253 | Donaldson Richard E | Bartlesville, OK 74005-0032 | Oil & Gas Operator | Nov 2005 |
| 254 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 255 | Dorfs Drilling Company | Waurika, OK 73573 | Oil & Gas Operator | Nov 2024 |
| 256 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 257 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 258 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Oct 2025 |
| 259 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 260 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 261 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Oct 2025 |
| 262 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 263 | Ea Petroleum Inc | Norman, OK 73072-4147 | Oil & Gas Operator | May 2006 |
| 264 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 265 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Sep 2025 |
| 266 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 267 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 268 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 269 | Eei Operating Inc. | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 270 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 271 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 272 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Oct 2025 |
| 273 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 274 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 275 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2025 |
| 276 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 277 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 278 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 279 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 280 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 281 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 282 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 283 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | Jan 2023 |
| 284 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 285 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 286 | Equity Export Oil & Gas Co Inc | Kansas City, MO 64116 | Oil & Gas Operator | Feb 2002 |
| 287 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 288 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 289 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 290 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 291 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 292 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 293 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 294 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 295 | Fahrenheit Petroleum Co Inc | | Oil & Gas Operator | Mar 2015 |
| 296 | Fail W T Inc | | Oil & Gas Operator | Mar 2015 |
| 297 | Farmers Energy Corporation | Tulsa, OK 74103-3525 | Oil & Gas Operator | Nov 2021 |
| 298 | Farrar Carolyn Dba C J Investments | Kingfisher, OK 73750 | Oil & Gas Operator | Sep 2024 |
| 299 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 300 | Faulconer, Vernon E., Inc. | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |