| 201 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Jan 2024 |
| 202 | Crude Marketing & Trans Inc | Tulsa, OK 74159 | Oil & Gas Operator | Sep 2017 |
| 203 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 204 | Crusader Energy Group LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 205 | Crusader Energy II LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 206 | Crusader Energy III LLC | Oklahoma City, OK 73142-1856 | Oil & Gas Operator | Feb 2011 |
| 207 | Culebra Oil & Gas LLC | Kerrville, TX 78028 | Oil & Gas Operator | Apr 2024 |
| 208 | Cummings Oil Company | Oklahoma City, OK 73112-6113 | Oil & Gas Operator | Feb 2024 |
| 209 | Curzon Operating Company LTD | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2024 |
| 210 | D & B Operating LLC | | Oil Operator | Jan 2023 |
| 211 | D & D Pipe & Equipment Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2005 |
| 212 | D & G Oil & Gas Company Inc | Enid, OK 73702-2027 | Oil & Gas Operator | Nov 2021 |
| 213 | D & H Oil Inc | Garber, OK 73738-0657 | Oil & Gas Operator | Apr 2021 |
| 214 | D & J Oil Co | Kermit, TX 79745 | Oil & Gas Operator | Apr 2024 |
| 215 | D & J Oil Company Of Okla Inc | Enid, OK 73706-0129 | Oil & Gas Operator | May 1999 |
| 216 | D & T Swabbing & Well Serv Inc | Hennessey, OK 73742-0124 | Oil & Gas Operator | Jan 2024 |
| 217 | D C Energy, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Apr 2020 |
| 218 | Daco, Inc. | Spearman, TX 79081 | Oil & Gas Operator | Apr 2024 |
| 219 | Dakota Exploration LLC | Tulsa, OK 74136-5709 | Oil & Gas Operator | Jan 2024 |
| 220 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 221 | Dance Oil Co | Denver, CO 80202 | Oil & Gas Operator | May 1993 |
| 222 | Dar-Lon Operating Company | Lamont, OK 74643 | Oil & Gas Operator | Oct 2000 |
| 223 | Darden Energy Corp | Hennessey, OK 73742 | Oil & Gas Operator | Jul 1999 |
| 224 | Darling Dan Oil | | Oil & Gas Operator | Sep 2018 |
| 225 | Darling Oil Corporation | Lamont, OK 74643-0158 | Oil & Gas Operator | Jan 2024 |
| 226 | Darnell Bobby J | Oklahoma City, OK 73112-8884 | Oil & Gas Operator | Feb 2024 |
| 227 | David E Morgan Inc | Danville, CA 94506-2035 | Oil & Gas Operator | Jan 2024 |
| 228 | Davidson Energy Inc | Perry, OK 73077-0782 | Oil & Gas Operator | Jan 2024 |
| 229 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 230 | Dawson-Markwell Exploration Co. | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2024 |
| 231 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Apr 2024 |
| 232 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 233 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 234 | Dee-Jay Exploration Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2024 |
| 235 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Jan 2024 |
| 236 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 237 | Dem Operations Inc | Lamont, OK 74643-5010 | Oil & Gas Operator | Feb 2024 |
| 238 | Denell Oil Corporation | Yukon, OK 73085 | Oil & Gas Operator | Jul 1994 |
| 239 | Denveramerican Petro LLC | | Oil & Gas Operator | May 2006 |
| 240 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 241 | Derrick Resources Inc. | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2024 |
| 242 | Destin Corporation | Enid, OK 73702-2403 | Oil & Gas Operator | Mar 2005 |
| 243 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 244 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 245 | Devon Gas Services LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 246 | Dewey Energy GP LLC | | Oil & Gas Operator | Jun 2022 |
| 247 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jan 2024 |
| 248 | Diamond B Company Inc | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2010 |
| 249 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 250 | Diamond Energy, Inc. | Sherman, TX 75091 | Oil & Gas Operator | Apr 2024 |
| 251 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 252 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 253 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 254 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 255 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2024 |
| 256 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Feb 2024 |
| 257 | Doco Development Corporation | Norman, OK 73070-4324 | Oil & Gas Operator | Feb 2024 |
| 258 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 259 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 260 | Donaldson Richard E | Bartlesville, OK 74005-0032 | Oil & Gas Operator | Nov 2005 |
| 261 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 262 | Dorfs Drilling Company | Waurika, OK 73573-0278 | Oil & Gas Operator | Feb 2024 |
| 263 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 264 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 265 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Jan 2024 |
| 266 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 267 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 268 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Feb 2024 |
| 269 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 270 | Ea Petroleum Inc | Norman, OK 73072-4147 | Oil & Gas Operator | May 2006 |
| 271 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 272 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Jan 2024 |
| 273 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 274 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2024 |
| 275 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 276 | Eei Operating Inc | Plano, TX 75093 | Oil & Gas Operator | May 2015 |
| 277 | Elf Aquitaine Inc | Houston, TX 77002 | Oil & Gas Operator | May 1991 |
| 278 | Elite Resources Inc | Cleveland, OK 74020-0614 | Oil & Gas Operator | Feb 2024 |
| 279 | Emmaus Energy LLC | | Oil & Gas Operator | Aug 2022 |
| 280 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2024 |
| 281 | Endeavor Natural Gas LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 282 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 283 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2023 |
| 284 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 285 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 286 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 287 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 288 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2024 |
| 289 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 290 | Equal Energy Us Inc | | Oil & Gas Operator | Nov 2019 |
| 291 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 292 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 293 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 294 | Exok, Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2024 |
| 295 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 296 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 297 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2024 |
| 298 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2024 |
| 299 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 300 | Fahrenheit Petroleum Co Inc | | Oil & Gas Operator | Mar 2015 |