| 201 | Donson Corporation | Edmond, OK 73083-0341 | Oil & Gas Operator | Jul 1997 |
| 202 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Jul 2025 |
| 203 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 204 | Drake Exploration Inc | Tulsa, OK 74105-4250 | Oil & Gas Operator | May 2025 |
| 205 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 206 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 207 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | May 2025 |
| 208 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 209 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 210 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | May 2025 |
| 211 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2025 |
| 212 | Ea Petroleum Inc | Norman, OK 73072-4147 | Oil & Gas Operator | May 2006 |
| 213 | Eagle Energy Production LLC | Tulsa, OK 74136-1935 | Oil & Gas Operator | Mar 2020 |
| 214 | Eagle Minerals & Oil Prop Inc | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2002 |
| 215 | Eagle Minerals Inc | Tulsa, OK 74119 | Oil Operator | Jun 1998 |
| 216 | Eagle Resources Inc | Claremore, OK 74019-5398 | Oil & Gas Operator | May 2013 |
| 217 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Mar 2025 |
| 218 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Apr 2025 |
| 219 | Eastok Energy Partners LLC | Edmond, OK 73013-1044 | Oil & Gas Operator | Apr 2025 |
| 220 | Eddie'S Submersible Service Inc | Shawnee, OK 74801-5047 | Oil & Gas Operator | Mar 2015 |
| 221 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 222 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 223 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 224 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 225 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 226 | Edwards Timothy D | Broken Arrow, OK 74014-4052 | Oil & Gas Operator | Apr 2015 |
| 227 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 228 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Apr 2025 |
| 229 | Elint Operating Inc | Oklahoma City, OK 73106 | Oil & Gas Operator | May 1995 |
| 230 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Apr 2025 |
| 231 | Emde & McNeil | Carney, OK 74832 | Oil & Gas Operator | Nov 1998 |
| 232 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 233 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | May 2025 |
| 234 | Energy Operations Oklahoma LP | Houston, TX 77002-6785 | Oil & Gas Operator | Nov 2010 |
| 235 | Enersource Petroleum Inc | Bixby, OK 74008 | Oil & Gas Operator | Apr 2025 |
| 236 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 237 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 238 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 239 | Eok Operating LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Jan 2025 |
| 240 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 241 | Epoch Resources Of Texas Inc | Port Aransas, TX 78373-1637 | Oil & Gas Operator | Nov 2014 |
| 242 | Equal Energy Us Inc | Tulsa, OK 74103-4621 | Oil & Gas Operator | Nov 2019 |
| 243 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 244 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 245 | Excel Operating Inc | Dallas, TX 75234-7300 | Oil & Gas Operator | Jun 2022 |
| 246 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 247 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 248 | Express Oil & Gas LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 249 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |
| 250 | Fail W T Inc | | Oil & Gas Operator | Mar 2015 |
| 251 | Felderhoff Production Company | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 252 | Fell Oil And Gas Inc | Tulsa, OK 74157-9487 | Oil & Gas Operator | Aug 2016 |
| 253 | Fha Operating LLC | Cushing, OK 74023-1030 | Oil & Gas Operator | Nov 2024 |
| 254 | Fitzsimmons Randall W & Deborah S | Bartesville, OK 74006 | Oil & Gas Operator | Feb 2025 |
| 255 | Flatt Energy Inc | | Oil & Gas Operator | Sep 2019 |
| 256 | Flowin Gold Inc | Sapulpa, OK 74066-9735 | Oil & Gas Operator | Apr 2020 |
| 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 | Freedom Operating Company LLC | Tulsa, OK 74136-6834 | Oil & Gas Operator | May 2025 |
| 260 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 261 | FWB Petroleum Inc | Euless, TX 76040 | Oil & Gas Operator | Dec 2000 |
| 262 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | May 2025 |
| 263 | Gamma Resources Inc. | Oklahoma City, OK 73120 | Oil & Gas Operator | Jan 2017 |
| 264 | Ganer Mark Oil & Gas | Owasso, OK 74055 | Oil & Gas Operator | Aug 2005 |
| 265 | Garr-Woolley Oil Company | Oklahoma City, OK 73142-6019 | Oil & Gas Operator | Nov 1995 |
| 266 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Mar 2025 |
| 267 | Geno Oil & Gas Corp | | Oil & Gas Operator | Sep 2009 |
| 268 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 269 | Geoex Resources Inc | | Oil & Gas Operator | Jan 1997 |
| 270 | Geoquest Energy Inc | Enid, OK 73706-0216 | Oil & Gas Operator | Nov 2015 |
| 271 | Giant Petroleum Corp | Jefferson, OH 44047 | Oil & Gas Operator | Dec 1990 |
| 272 | Gibson Les | Welty, OK 74833 | Oil & Gas Operator | May 2025 |
| 273 | Gill Jet C Dba Jetco Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2023 |
| 274 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | May 2025 |
| 275 | Glacier Petroleum Co., Inc. | Emporia, KS 66801 | Oil & Gas Operator | Mar 2025 |
| 276 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 277 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 278 | Good Vaughn | Enid, OK 73702 | Oil & Gas Operator | Jul 2008 |
| 279 | Goodnight C A Dba C & M Oil Company | Tecumseh, OK 74873-4825 | Oil Operator | Jan 2013 |
| 280 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 281 | Gordon Robert Oil Company | Stroud, OK 74070-0366 | Oil & Gas Operator | Jul 2001 |
| 282 | GPM Gas Corp | Oklahoma City, OK 73102-5627 | Oil & Gas Operator | Nov 1998 |
| 283 | Gray Oil & Gas Inc. | Abilene, TX 79606 | Oil & Gas Operator | Oct 2013 |
| 284 | Great Horned Owls, LLC | Katy, TX 77494 | Oil & Gas Operator | May 2025 |
| 285 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Mar 2025 |
| 286 | Greer Tom R | Ponca City, OK 74602-2444 | Oil & Gas Operator | May 2013 |
| 287 | Griebel-Valliquette | Stroud, OK 74079-0231 | Oil & Gas Operator | Aug 2016 |
| 288 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 289 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 290 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 291 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 292 | H & H Operating | Olney, TX 76374 | Oil & Gas Operator | Jul 2025 |
| 293 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 294 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 295 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 296 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 297 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 298 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 299 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 300 | Harrison-Wright Oil Company LLC | Tulsa, OK 74133-7035 | Oil & Gas Operator | May 2025 |