| 201 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 202 | Discovery Operating Inc | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 203 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Jul 2025 |
| 204 | Divide Petroleum Co | | Oil & Gas Operator | May 2000 |
| 205 | Dixie Oil Company Inc | Moore, OK 73153 | Oil & Gas Operator | Nov 1994 |
| 206 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 207 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 208 | Dixon J C | Okmulgee, OK 74447-8522 | Oil & Gas Operator | Dec 2024 |
| 209 | Dixon, Bucky | | Oil & Gas Operator | Aug 2016 |
| 210 | DK Oil Company | Winters, TX 79567 | Oil & Gas Operator | Jul 2022 |
| 211 | DKT Energy LLC | Edmond, OK 73083-6844 | Oil & Gas Operator | Sep 2014 |
| 212 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 213 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jul 2025 |
| 214 | DLKB Operating LLC | Eufaula, OK 74432 | Gas Operator | Apr 2025 |
| 215 | DM Petroleum LLC | Duncan, OK 73533 | Oil Operator | Apr 2025 |
| 216 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 217 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 218 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 219 | Dobson Oil And Gas LLC | Deer Creek, OK 74636 | Oil Operator | Aug 2022 |
| 220 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 221 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 222 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Mar 2025 |
| 223 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 224 | Domar Oil & Gas, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 225 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 226 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 227 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 228 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 229 | Don'S Oil Company Inc | Oxford, KS 67119-0006 | Oil Operator | Apr 2011 |
| 230 | Donaldson Richard E | Bartlesville, OK 74005-0032 | Oil & Gas Operator | Nov 2005 |
| 231 | Doneghy James | Wellington, TX 79095 | Oil & Gas Operator | May 2013 |
| 232 | Donovan Joe D Or L P McElwaine | Tulsa, OK 74119 | Gas Operator | Jan 2014 |
| 233 | Donray Petroleum LLC | Choctaw, OK 73020 | Oil & Gas Operator | Apr 2025 |
| 234 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 235 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 236 | Dorado Energy LLC | Edmond, OK 73012 | Oil & Gas Operator | Jan 2021 |
| 237 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 238 | Dorchester Hugoton LTD | Garland, TX 75042-8212 | Oil & Gas Operator | Mar 2004 |
| 239 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 240 | Dorey Oil Corporation | Healdton, OK 73438-0856 | Oil Operator | Apr 2014 |
| 241 | Dorfs Drilling Company | Waurika, OK 73573 | Oil & Gas Operator | Nov 2024 |
| 242 | Dotson Jack M Operating Co | Norman, OK 73072-6649 | Oil Operator | Oct 1993 |
| 243 | Double "C" Energy | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 244 | Double "D" Oil Company, Inc. | Winfield, KS 67156 | Oil Operator | Mar 2025 |
| 245 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | Feb 2025 |
| 246 | Double C Operating LLC | Abilene, TX 79602 | Oil Operator | Jul 2025 |
| 247 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 248 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Jul 2025 |
| 249 | Double G Oil LLC | | Oil Operator | Apr 2025 |
| 250 | Double H Petroleum Corporation | Tulsa, OK 74136-5414 | Oil & Gas Operator | May 2006 |
| 251 | Double J Oil Co LLC | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 252 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 253 | Douglas Fairbanks Holdings LLC | Pine Hurst, TX 77362-9998 | Oil & Gas Operator | Apr 2025 |
| 254 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 255 | Douglas Oil & Gas Co Inc | Ada, OK 74820 | Oil Operator | Apr 2014 |
| 256 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 257 | Dove Investments LLC | Wetumka, OK 74883 | Oil Operator | Mar 2025 |
| 258 | Downhole Oil & Gas Tech LLC | Countyline, OK 73152-0027 | Oil Operator | Oct 2009 |
| 259 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 260 | Dragon Energy LLC | Tulsa, OK 74135-7234 | Oil & Gas Operator | Feb 2015 |
| 261 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | May 2025 |
| 262 | Drake Exploration LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Apr 2025 |
| 263 | Draw Oil & Gas Inc | | Oil & Gas Operator | Jun 1995 |
| 264 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Apr 2025 |
| 265 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 266 | Drummond Upstream LLC | Tulsa, OK 74104 | Oil & Gas Operator | Apr 2025 |
| 267 | Drummond, F F | | Oil Operator | Apr 2025 |
| 268 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2025 |
| 269 | Dryes Corner LLC | Crescent, OK 73028 | Oil Operator | Apr 2025 |
| 270 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 271 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 272 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | May 2025 |
| 273 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | May 2025 |
| 274 | Duck Oil Company LLC | Konawa, OK 74849 | Oil Operator | Apr 2025 |
| 275 | Duck Production Management LLC | Konawa, OK 74849 | Oil Operator | May 2025 |
| 276 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 277 | Duffer William R | Edmond, OK 73034-6761 | Oil & Gas Operator | Aug 2018 |
| 278 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 279 | Duggins Equipment Inc | Woodward, OK 73802-1213 | Gas Operator | Apr 2025 |
| 280 | Dukes T F | | Oil & Gas Operator | Apr 2007 |
| 281 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 282 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 283 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 284 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 285 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 286 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 287 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 288 | Dunigan Operating Company, Inc. | Austin, TX 78755 | Oil & Gas Operator | Jul 2025 |
| 289 | Dunkin Oil And Gas LLC | Wynewood, OK 73098-9196 | Oil Operator | May 2025 |
| 290 | Dunlap Drilling And Producing, Inc | Glenpool, OK 74033-4206 | Oil & Gas Operator | Apr 2025 |
| 291 | Dunlap Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Apr 2025 |
| 292 | Dunlap Well Service Inc | Haskell, OK 74436 | Oil & Gas Operator | Sep 1993 |
| 293 | Dunn Energy LLC | Skiatook, OK 74070-4046 | Oil Operator | Sep 2022 |
| 294 | Dunn'S Oil And Gas Lease Management LLC | Ardmore, OK 73401 | Oil & Gas Operator | Apr 2025 |
| 295 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 296 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 297 | Durango Energy Inc | Chickasha, OK 73023 | Oil Operator | Dec 1999 |
| 298 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | May 2025 |
| 299 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Jul 2025 |
| 300 | Duroc Exploration LLC | Bixby, OK 74008 | Oil Operator | Apr 2025 |