| 201 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 202 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 203 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 204 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 205 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 206 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |
| 207 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 208 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 209 | Devon SFS Operating Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 210 | Digger Oil & Gas Inc | Prague, OK 74864 | Oil & Gas Operator | Nov 2025 |
| 211 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 212 | Dixie Petroleum Inc | Cashion, OK 73016 | Oil & Gas Operator | May 2001 |
| 213 | DLB Energy Corporation | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Dec 2014 |
| 214 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Dec 2025 |
| 215 | Doco Development Corporation | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 216 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 217 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 218 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 219 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 220 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 221 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 222 | Dunn'S Oil And Gas Lease Management LLC | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2025 |
| 223 | E Lyle Johnson Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 224 | Eagle Exploration Production LLC | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 225 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 226 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Oct 2025 |
| 227 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Oct 2025 |
| 228 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 229 | Easterwood D E | Duncan, OK 73533-1013 | Oil & Gas Operator | Jun 2001 |
| 230 | Echo E & P LLC | Oklahoma City, OK 73102-6439 | Oil & Gas Operator | Oct 2025 |
| 231 | Eckard Operating, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 232 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 233 | Edinger Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2007 |
| 234 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 235 | Eec Inc | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 236 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Oct 2025 |
| 237 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 238 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Nov 2025 |
| 239 | Elder & Vaughn Inc | Oklahoma City, OK 73154-0938 | Oil & Gas Operator | Mar 2008 |
| 240 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Nov 2025 |
| 241 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Oct 2025 |
| 242 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Nov 2025 |
| 243 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 244 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 245 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 246 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 247 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 248 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 249 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 250 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 251 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 252 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 253 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 254 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 255 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2025 |
| 256 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 257 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Dec 2025 |
| 258 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 259 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Oct 2025 |
| 260 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 261 | Far West Development, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 262 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 263 | FBF Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Nov 2025 |
| 264 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | Dec 2025 |
| 265 | Fell Oil And Gas Inc | Tulsa, OK 74157-9487 | Oil & Gas Operator | Aug 2016 |
| 266 | Femco Services Inc | Lindsay, OK 73052-0632 | Oil & Gas Operator | Nov 2006 |
| 267 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 268 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Dec 2025 |
| 269 | Fletcher Oil LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Nov 2025 |
| 270 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 271 | Foreman Enterprises Inc | Edmond, OK 73003 | Oil & Gas Operator | Oct 2025 |
| 272 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 273 | Four-O-One Corporation | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2015 |
| 274 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 275 | Franks Oil & Gas Inc | Cookson, OK 74427-0310 | Oil & Gas Operator | Oct 1998 |
| 276 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 277 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 278 | Fuksa Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 279 | G & N Oil & Gas LLC | Asher, OK 74826 | Oil & Gas Operator | Mar 2025 |
| 280 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 281 | Genesis Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 1995 |
| 282 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 283 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 284 | Gilco Oil Inc | Ada, OK 74820 | Oil & Gas Operator | May 2019 |
| 285 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 286 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Nov 2025 |
| 287 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | Nov 2025 |
| 288 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2025 |
| 289 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Oct 2025 |
| 290 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2025 |
| 291 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 292 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Nov 2025 |
| 293 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Oct 2025 |
| 294 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 295 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 296 | Grand Production Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2000 |
| 297 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2025 |
| 298 | Green Operating Company Inc | Tulsa, OK 74135 | Oil & Gas Operator | Sep 2025 |
| 299 | Green River Operating Co Inc | Noble, OK 73068-5521 | Oil & Gas Operator | Feb 2018 |
| 300 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Nov 2025 |