| 201 | Dinsmore C E | Enid, OK 73702 | Oil & Gas Operator | May 2009 |
| 202 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Mar 2025 |
| 203 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Mar 2025 |
| 204 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2025 |
| 205 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 206 | Dominion Exp Midcontinent Inc | Oklahoma City, OK 73134-2616 | Oil & Gas Operator | Oct 2024 |
| 207 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 208 | Dominion Ok TX E & P Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2018 |
| 209 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Mar 2025 |
| 210 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 211 | Dragon Energy LLC | Tulsa, OK 74135-7234 | Oil & Gas Operator | Feb 2015 |
| 212 | Duncan Oil & Gas Inc | Norman, OK 73072 | Oil & Gas Operator | Sep 2020 |
| 213 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 214 | Duncan Walter | | Oil & Gas Operator | May 2019 |
| 215 | Dune Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jan 1993 |
| 216 | Durango Exploration LLC | Oklahoma City, OK 73120-5309 | Oil & Gas Operator | Jan 2025 |
| 217 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 218 | E. T. S. Enterprises, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Jul 1996 |
| 219 | Eagle Gas Marketing Co | Oklahoma City, OK 73114-2202 | Oil & Gas Operator | Nov 2022 |
| 220 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 221 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Dec 2024 |
| 222 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | Dec 2024 |
| 223 | Eberly & Meade | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2002 |
| 224 | Ecc Energy Corporation | Dewey, OK 74029 | Oil & Gas Operator | Feb 2020 |
| 225 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 226 | Edwards & Leach Oil Company | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2005 |
| 227 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Jan 2025 |
| 228 | Egolf Operating Company | Oklahoma City, OK 73114-7899 | Oil & Gas Operator | Apr 1998 |
| 229 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | Dec 2024 |
| 230 | Eight Round Corporation | Seminole, OK 74818-1482 | Oil & Gas Operator | Jul 2012 |
| 231 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 232 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jan 2025 |
| 233 | Elco Resources LLC | Owasso, OK 74055-7575 | Oil & Gas Operator | Dec 2024 |
| 234 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jan 2025 |
| 235 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 236 | Emmaus Energy LLC | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2024 |
| 237 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 238 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 239 | Encino Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 240 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 241 | Enernet Inc | Oklahoma City, OK 73102-8004 | Oil & Gas Operator | Nov 2014 |
| 242 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 243 | Enogex Products Corp | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jun 2022 |
| 244 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 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 Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 248 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 249 | Equipment Lott Inc The | Hennessey, OK 73742-0655 | Oil & Gas Operator | Mar 2008 |
| 250 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 251 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 252 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 253 | Essex Energy Inc | Yukon, OK 73099-5126 | Oil & Gas Operator | Apr 2014 |
| 254 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 255 | Evolution Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 256 | Excalibur Resources LLC | Houston, TX 77002-5220 | Oil & Gas Operator | Dec 2024 |
| 257 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 258 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Dec 2024 |
| 259 | Exploration Associates | Oklahoma City, OK 73102-8606 | Oil & Gas Operator | Mar 2015 |
| 260 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 261 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 2024 |
| 262 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Dec 2024 |
| 263 | Farris Well Service LLC | Liberal, KS 67901-5644 | Oil & Gas Operator | Jul 2016 |
| 264 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 265 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Jan 2025 |
| 266 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 267 | FBF Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2025 |
| 268 | Femco SWD Inc | Enid, OK 73702-3907 | Oil Operator | Mar 2014 |
| 269 | Fitkin Petroleum Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 1994 |
| 270 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 271 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 272 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Jan 2025 |
| 273 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 274 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 275 | Four-O-One Corporation | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2015 |
| 276 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 277 | Franks Oil & Gas Inc | Cookson, OK 74427-0310 | Oil & Gas Operator | Oct 1998 |
| 278 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 279 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 280 | Frontier Energy Serv LLC | Enid, OK 73702-1187 | Oil & Gas Operator | Jun 2016 |
| 281 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 282 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Mar 2025 |
| 283 | G A W Oil Company LLC | Enid, OK 73702-3926 | Oil & Gas Operator | Jan 2025 |
| 284 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 285 | Garrison Bros Pipe & Used Equip Inc | Hinton, OK 73047 | Oil & Gas Operator | Aug 2013 |
| 286 | Gary M Lake & Company | Edmond, OK 73012-8208 | Oil & Gas Operator | Aug 2021 |
| 287 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 288 | Genesis Crude Oil LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 289 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 290 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 291 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 292 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Jan 2025 |
| 293 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 294 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2024 |
| 295 | Golden Gas Energies Inc | | Oil & Gas Operator | Jan 1999 |
| 296 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2024 |
| 297 | Golden Gas Service Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2025 |
| 298 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 299 | Gore Gail B | Camargo, OK 73835-9737 | Oil & Gas Operator | Aug 2014 |
| 300 | Gore Operating LLC | Clinton, OK 73601 | Oil & Gas Operator | Dec 2024 |