| 201 | EOG (Oklahoma) Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Oct 2016 |
| 202 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 203 | Eott Energy Corporation | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 1995 |
| 204 | EP Operating LP | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 205 | Esco Exploration, Inc | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 206 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 207 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 208 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2025 |
| 209 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 210 | F C D Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 1995 |
| 211 | Fairway Resources Operating III LLC | Houston, TX 77002-2728 | Oil & Gas Operator | Jan 2025 |
| 212 | Fairway Resources Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Aug 2022 |
| 213 | Farris Well Service LLC | Liberal, KS 67901-5644 | Oil & Gas Operator | Jul 2016 |
| 214 | Faulconer Energy, LLC | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 215 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Feb 2025 |
| 216 | Faulkner Corporation | Oklahoma City, OK 73154-9704 | Oil & Gas Operator | Jan 2017 |
| 217 | FBF Energy LLC | Tulsa, OK 74120 | Oil & Gas Operator | Feb 2025 |
| 218 | Finlay Energy, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 1999 |
| 219 | Flag-Redfern Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Jul 2002 |
| 220 | Foreman Enterprises, Inc. | Edmond, OK 73003 | Oil & Gas Operator | Feb 2025 |
| 221 | Fossil Creek Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Apr 2025 |
| 222 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 223 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 224 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 225 | FX Energy Operating, LLC | Canadian, TX 79014 | Oil & Gas Operator | Apr 2025 |
| 226 | G A W Oil Company LLC | Enid, OK 73702-3926 | Oil & Gas Operator | Feb 2025 |
| 227 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 228 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 229 | Gala Resources, LTD. | Graham, TX 76450 | Oil & Gas Operator | Jan 2025 |
| 230 | Gary Jr Samuel & Assoc Inc | Denver, CO 80202-4803 | Oil & Gas Operator | Jul 1999 |
| 231 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | Feb 2025 |
| 232 | Gel Oil & Gas Inc | Wetumka, OK 74883-6238 | Oil & Gas Operator | Jul 2016 |
| 233 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 234 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 235 | Geyer Brothers Equipment Company | Noble, OK 73068-8540 | Oil & Gas Operator | Mar 2011 |
| 236 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2025 |
| 237 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 238 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 239 | Golden Gas Service Company | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2025 |
| 240 | Good Vaughn Oil Company LLC | Enid, OK 73702-3744 | Oil & Gas Operator | Jun 2019 |
| 241 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 242 | GPM Gas Corporation | Oklahoma City, OK 73102-5627 | Oil & Gas Operator | Jun 2000 |
| 243 | Graham Oil And Gas, LTD. | Covington, LA 70434-3134 | Oil & Gas Operator | Aug 2013 |
| 244 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 245 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 246 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Apr 2025 |
| 247 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 248 | Green Valley Disposal Serv LLC | Alva, OK 73717 | Oil Operator | Feb 2025 |
| 249 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Feb 2025 |
| 250 | Greystone Exploration Co | Oklahoma City, OK 73177 | Oil & Gas Operator | Apr 1996 |
| 251 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 252 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 253 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 254 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 255 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Feb 2025 |
| 256 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 257 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Jan 2025 |
| 258 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 259 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Jan 2025 |
| 260 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Jan 2025 |
| 261 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 262 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 263 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 264 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Dec 2024 |
| 265 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 266 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 267 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 268 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Jan 2025 |
| 269 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 270 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2025 |
| 271 | Henderson Operating Co Inc | | Oil & Gas Operator | Nov 2003 |
| 272 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Feb 2025 |
| 273 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2025 |
| 274 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 275 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Apr 2025 |
| 276 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 277 | Hiland Energy LP | Enid, OK 73701-0032 | Oil & Gas Operator | Dec 2022 |
| 278 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 279 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 280 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Jan 2025 |
| 281 | Holland Exploration Company | | Oil & Gas Operator | Apr 2007 |
| 282 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 283 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 284 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 285 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2025 |
| 286 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2025 |
| 287 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 288 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 289 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 290 | Iep Kansas Gas, LLC | Burlington, CO 80807 | Oil & Gas Operator | Feb 2025 |
| 291 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 292 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |
| 293 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 294 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Feb 2025 |
| 295 | J & M Oil Co | Overland PK, KS 66209 | Oil & Gas Operator | Dec 2024 |
| 296 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 297 | Jack Exploration, Inc. | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2017 |
| 298 | Jackson Oilfield Service Inc | Purcell, OK 73080-4357 | Oil & Gas Operator | Jan 2021 |
| 299 | James Petroleum Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2014 |
| 300 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |