| 201 | Deminex U S Oil Company | | Oil & Gas Operator | Jan 1998 |
| 202 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 203 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 204 | Dilley Corp | Yale, OK 74085 | Oil & Gas Operator | May 2013 |
| 205 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 206 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 207 | DMS Investments Inc | Tulsa, OK 74132-2690 | Oil & Gas Operator | Mar 2015 |
| 208 | Dobbins Family Residual Trust | Ardmore, OK 73401 | Oil Operator | Jul 2008 |
| 209 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Jun 2025 |
| 210 | Domac Oil Company Inc | Perkins, OK 74059-0642 | Oil & Gas Operator | Feb 2006 |
| 211 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Dec 2025 |
| 212 | Double H Petroleum Corporation | Tulsa, OK 74136-5414 | Oil & Gas Operator | May 2006 |
| 213 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 214 | Doug And Janene Risenhoover Oil And Gas LLC | Cushing, OK 74023 | Oil Operator | Sep 2025 |
| 215 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | Sep 2025 |
| 216 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Sep 2025 |
| 217 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 218 | Eagle Energy Production LLC | Tulsa, OK 74136-1935 | Oil & Gas Operator | Mar 2020 |
| 219 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 220 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 221 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Aug 2025 |
| 222 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Aug 2025 |
| 223 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 224 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 225 | Edwards Johnny E | Drumright, OK 74030 | Oil Operator | Apr 2011 |
| 226 | Edwards Oil & Gas Company | Oklahoma City, OK 73156-0386 | Oil & Gas Operator | Mar 2015 |
| 227 | Edwards Roy & Co Inc | Edmond, OK 73013-1354 | Oil & Gas Operator | Feb 2012 |
| 228 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Sep 2025 |
| 229 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Aug 2025 |
| 230 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 231 | Eleven K Oil & Gas LLC | Cushing, OK 74023 | Oil Operator | Sep 2025 |
| 232 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 233 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Sep 2025 |
| 234 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Sep 2025 |
| 235 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Aug 2025 |
| 236 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | Aug 2025 |
| 237 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 238 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | Aug 2025 |
| 239 | Energy Three Inc. | Jackson, MS 39211 | Oil & Gas Operator | Aug 2025 |
| 240 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 241 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 242 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 243 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 244 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Aug 2025 |
| 245 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 246 | Eubank Operating Company | Cushing, OK 74023 | Oil & Gas Operator | Aug 2024 |
| 247 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 248 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Aug 2025 |
| 249 | Farley Christopher D | Kellyville, OK 74039 | Oil & Gas Operator | Jul 2019 |
| 250 | FGS Energy LLC | Duncan, OK 73533-1829 | Oil & Gas Operator | Sep 2025 |
| 251 | Fha Investments LLC | Cushing, OK 74023 | Oil & Gas Operator | Aug 2025 |
| 252 | Fha Operating LLC | Cushing, OK 74023-1030 | Oil & Gas Operator | Jun 2025 |
| 253 | Fitzsimmons Randall W & Deborah S | Bartelsville, OK 74006 | Oil & Gas Operator | Sep 2025 |
| 254 | Flatt Energy Inc | | Oil & Gas Operator | Sep 2019 |
| 255 | Flint Equipment LLC | Cushing, OK 74023 | Oil Operator | Sep 2025 |
| 256 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 257 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 258 | Four-O-One Corporation | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2015 |
| 259 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 260 | FP Operations, LLC | Dallas, TX 75219 | Oil & Gas Operator | Aug 2025 |
| 261 | Freedom Operating Company LLC | Tulsa, OK 74136-6834 | Oil & Gas Operator | Sep 2025 |
| 262 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Sep 2025 |
| 263 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 264 | G M G Oil & Gas Corp. | Morris, OK 74445 | Oil & Gas Operator | Sep 2025 |
| 265 | Gaskins Glendell L | Slick, OK 74071 | Oil & Gas Operator | Sep 2025 |
| 266 | Geo American Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 267 | Geoquest Energy Inc | Enid, OK 73706-0216 | Oil & Gas Operator | Nov 2015 |
| 268 | Gibson Les | Welty, OK 74833 | Oil & Gas Operator | Sep 2025 |
| 269 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Sep 2025 |
| 270 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 271 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 272 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 273 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Sep 2025 |
| 274 | Good Vaughn | Enid, OK 73702 | Oil & Gas Operator | Jul 2008 |
| 275 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 276 | Gordon Robert Oil Company | Stroud, OK 74070-0366 | Oil & Gas Operator | Jul 2001 |
| 277 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 278 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 279 | Grooms T D | Stillwater, OK 74075-3600 | Oil & Gas Operator | Oct 2001 |
| 280 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 281 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 282 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 283 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 284 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 285 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | Sep 2025 |
| 286 | H & M Resources, LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 287 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 288 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 289 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 290 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 291 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 292 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Aug 2025 |
| 293 | Harmony Oil LLC | Cushing, OK 74023 | Oil Operator | Aug 2025 |
| 294 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Aug 2025 |
| 295 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 296 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | Sep 2025 |
| 297 | Harter Energy Inc | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2025 |
| 298 | Hays Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2000 |
| 299 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 300 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |