| 201 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 202 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 203 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Nov 2025 |
| 204 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Nov 2025 |
| 205 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 206 | Delta D Operations | Wilson, OK 73463 | Oil & Gas Operator | Jul 2014 |
| 207 | Delta D Operations Inc | Ardmore, OK 73401-8678 | Oil & Gas Operator | Apr 2014 |
| 208 | Demier Oil Company | Tulsa, OK 74105-2128 | Oil & Gas Operator | Nov 2008 |
| 209 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 210 | Derae Oil Company | Seminole, OK 74868-2617 | Oil & Gas Operator | Feb 1997 |
| 211 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Oct 2025 |
| 212 | Deshields Gary | Atwood, OK 74827 | Oil Operator | Aug 2025 |
| 213 | Deshields Oil & Gas Inc | Okemah, OK 74859-9612 | Oil & Gas Operator | Sep 2014 |
| 214 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 215 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 216 | Diamond Energy Operating Company | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2005 |
| 217 | Diamond Harry H Inc | Shawnee, OK 74801 | Oil & Gas Operator | Nov 2025 |
| 218 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Nov 2025 |
| 219 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 220 | Dobson Oil Operators Inc | Sapulpa, OK 74066 | Oil & Gas Operator | Dec 2004 |
| 221 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 222 | Dorchester Resources LP | Oklahoma City, OK 73154-8879 | Oil & Gas Operator | Aug 2021 |
| 223 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 224 | Dove Investments LLC | Wetumka, OK 74883 | Oil Operator | Aug 2025 |
| 225 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 226 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Nov 2025 |
| 227 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 228 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | Oct 2025 |
| 229 | Duncan Ronald R | Okemah, OK 74859-9603 | Oil & Gas Operator | Aug 2023 |
| 230 | Duroc Exploration LLC | Bixby, OK 74008 | Oil & Gas Operator | Oct 2025 |
| 231 | Dyne Exploration Company | Plano, TX 75093-6512 | Oil & Gas Operator | Apr 2020 |
| 232 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 233 | Eagle Oil & Gas Properties Inc | Pleasant Prarie, WI 53158-4719 | Oil & Gas Operator | Jan 2016 |
| 234 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Oct 2025 |
| 235 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 236 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 237 | Egan Resources Inc. | Katy, TX 77494 | Oil & Gas Operator | Oct 2016 |
| 238 | Eight Round Corporation | Seminole, OK 74818-1482 | Oil & Gas Operator | Jul 2012 |
| 239 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 240 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Oct 2025 |
| 241 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Nov 2025 |
| 242 | Elkhorn Exploration Co | Willis, TX 77378-8827 | Oil & Gas Operator | Dec 2025 |
| 243 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 244 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 245 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Nov 2025 |
| 246 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 247 | Energy Environment Inc | Holdenville, OK 74848-0765 | Oil & Gas Operator | Jul 2016 |
| 248 | Energy Production Services LLC | Oklahoma City, OK 73162-4736 | Oil & Gas Operator | Apr 2020 |
| 249 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 250 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 251 | Enersource Royalty Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2013 |
| 252 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 253 | Ennis Bill H | Sasakwa, OK 74867-0001 | Oil & Gas Operator | Sep 2014 |
| 254 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 255 | Excel Production Inc | Lubbock, TX 79424-2341 | Oil Operator | Apr 2020 |
| 256 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 257 | Exoko Operating Company Inc | Tulsa, OK 74170-0246 | Oil & Gas Operator | Jan 2006 |
| 258 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 259 | Express Oil & Gas LLC | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Nov 2025 |
| 260 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 261 | Fairfield Oil & Gas Corp | Edmond, OK 73083 | Oil & Gas Operator | Nov 2021 |
| 262 | Faith Production LLC | Holdenville, OK 74848 | Oil & Gas Operator | Nov 2025 |
| 263 | Farley Christopher D | Kellyville, OK 74039 | Oil & Gas Operator | Jul 2019 |
| 264 | Farmers Energy Corporation | Tulsa, OK 74103-3525 | Oil & Gas Operator | Nov 2021 |
| 265 | Feeley Ranch LLC | Broken Arrow, OK 74014 | Gas Operator | Dec 2017 |
| 266 | Flagin Operating LLC | Norman, OK 73072-2405 | Oil & Gas Operator | Oct 2025 |
| 267 | Flint Douglas J | Mounds, OK 74047-5415 | Oil & Gas Operator | Sep 2015 |
| 268 | Flint J A & Associates | Holdenville, OK 74848 | Oil & Gas Operator | Sep 2009 |
| 269 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 270 | Formor Operating Inc | Tyler, TX 75701 | Oil & Gas Operator | May 2013 |
| 271 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2025 |
| 272 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 273 | Frank T Fleet Inc | Ada, OK 74820 | Oil Operator | Oct 2025 |
| 274 | Freedom Operating Company LLC | Tulsa, OK 74136-6834 | Oil & Gas Operator | Nov 2025 |
| 275 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 276 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 277 | G R B Resources Inc | Tulsa, OK 74136-5108 | Oil & Gas Operator | Aug 2013 |
| 278 | Gatewood Edward J "Bob" | Holdenville, OK 74848 | Oil & Gas Operator | May 2013 |
| 279 | Gel Oil & Gas Inc | Wetumka, OK 74883-6238 | Oil & Gas Operator | Jul 2016 |
| 280 | General Petroleum Corp | Sand Springs, OK 74063-6646 | Oil & Gas Operator | Jul 2015 |
| 281 | Genesis Inc | Seminole, OK 74818-1647 | Oil & Gas Operator | Sep 2014 |
| 282 | Geoex Resources Inc | | Oil & Gas Operator | Jan 1997 |
| 283 | Geoquest Energy Inc | Enid, OK 73706-0216 | Oil & Gas Operator | Nov 2015 |
| 284 | Gilbert Oil Properties | Tulsa, OK 74105-3741 | Oil Operator | Oct 2025 |
| 285 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 286 | Glenco Oil & Gas Corporation | Wewoka, OK 74884-0727 | Oil & Gas Operator | Sep 2021 |
| 287 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2025 |
| 288 | Golden Gas Service Company | Tulsa, OK 74114 | Oil & Gas Operator | Nov 2025 |
| 289 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 290 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Nov 2025 |
| 291 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 292 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 293 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2025 |
| 294 | Grant Petroleum Corporation | Horseshoe Bay, TX 78657-8926 | Oil & Gas Operator | Dec 2014 |
| 295 | Great Plains Oil & Gas | Ada, OK 74820-7209 | Oil & Gas Operator | May 2013 |
| 296 | Great Southwestern Expl Inc | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 297 | Green Operating Company Inc | Tulsa, OK 74135 | Oil & Gas Operator | Sep 2025 |
| 298 | Green William G | Jenks, OK 74037-3233 | Oil & Gas Operator | Apr 2020 |
| 299 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2025 |
| 300 | Gugli Corporation | Byng, OK 74820 | Oil & Gas Operator | Sep 2014 |