| 201 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 202 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 203 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 204 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 205 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 206 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 207 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2025 |
| 208 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 209 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 210 | Dobson Oil And Gas LLC | Deer Creek, OK 74636-9521 | Oil Operator | Aug 2022 |
| 211 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Jan 2025 |
| 212 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 213 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 214 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 215 | Donray Petroleum LLC | Oklahoma City, OK 73112-7230 | Oil & Gas Operator | Dec 2024 |
| 216 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 217 | Draw Oil & Gas Inc | | Oil & Gas Operator | Jun 1995 |
| 218 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 219 | Duesler Welding Service | | Oil Operator | Mar 2007 |
| 220 | Duncan Jr J Walter | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2016 |
| 221 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 222 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 223 | Dundee Oil & Supply Inc | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2001 |
| 224 | Durango Energy Inc | Chickasha, OK 73023 | Oil Operator | Dec 1999 |
| 225 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 226 | E & S Resources LLC | Crescent, OK 73028 | Oil & Gas Operator | Dec 2024 |
| 227 | Eagle Energy PTR I LP | Houston, TX 77064 | Oil & Gas Operator | Feb 2015 |
| 228 | Eagle Gas Marketing Co | Oklahoma City, OK 73114-2202 | Oil & Gas Operator | Nov 2022 |
| 229 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Dec 2024 |
| 230 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Dec 2024 |
| 231 | Eastok Energy Partners LLC | Edmond, OK 73013-1044 | Oil & Gas Operator | Nov 2024 |
| 232 | Eberly & Meade | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2002 |
| 233 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 234 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Jan 2025 |
| 235 | Eight Round Corporation | Seminole, OK 74818-1482 | Oil & Gas Operator | Jul 2012 |
| 236 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 237 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 238 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2025 |
| 239 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jan 2025 |
| 240 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 241 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 242 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 243 | Enerwest Trading Co LLC | Duncan, OK 73534 | Oil & Gas Operator | Dec 2024 |
| 244 | Enogex Services Corporation | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Apr 2009 |
| 245 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 246 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 247 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 248 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 249 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Dec 2024 |
| 250 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 251 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 252 | Eubank Michael Dba Trilby Oil Company | Amber, OK 73004-4903 | Oil Operator | May 2022 |
| 253 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 254 | Excalibur Resources LLC | Houston, TX 77002-5220 | Oil & Gas Operator | Dec 2024 |
| 255 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 256 | Exploration Associates II LLC | Oklahoma City, OK 73102-8815 | Oil & Gas Operator | Jan 2013 |
| 257 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 258 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 259 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Dec 2024 |
| 260 | Farmers Energy Corporation | Tulsa, OK 74103-3525 | Oil & Gas Operator | Nov 2021 |
| 261 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 262 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 263 | Fears George E | | Oil & Gas Operator | Mar 2019 |
| 264 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 265 | Floyd Operating Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2004 |
| 266 | Flux Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Mar 2025 |
| 267 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 268 | Forcenergy Inc | Miami, FL 33129 | Oil & Gas Operator | Mar 2015 |
| 269 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 270 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 271 | Forestar Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2016 |
| 272 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 273 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 274 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 275 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 276 | Frontier Energy Serv LLC | Enid, OK 73702-1187 | Oil & Gas Operator | Jun 2016 |
| 277 | Fullspike Energy LLC | Boyd, TX 76023 | Oil & Gas Operator | Mar 2025 |
| 278 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 279 | Garrison Bros Pipe & Used Equip Inc | Hinton, OK 73047 | Oil & Gas Operator | Aug 2013 |
| 280 | Gas Development Corp. | Broken Arrow, OK 74012 | Oil & Gas Operator | Mar 2015 |
| 281 | Gateway Pipeline Co | Houston, TX 77002 | Gas Operator | Oct 2003 |
| 282 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | Jan 2025 |
| 283 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 284 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 285 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 286 | Geyer Brothers Equipment Company | Noble, OK 73068-8540 | Oil & Gas Operator | Mar 2011 |
| 287 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 288 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2024 |
| 289 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Jan 2025 |
| 290 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 291 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 292 | Grace Energy Management Inc | Cement, OK 73017 | Oil Operator | Jan 2025 |
| 293 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 294 | Gray Lloyd Energy Inc | Oklahoma City, OK 73120-8112 | Oil & Gas Operator | Nov 2005 |
| 295 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jan 2025 |
| 296 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 297 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2025 |
| 298 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 299 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 300 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |