| 301 | Eagle Operating Company | Tulsa, OK 74146-5730 | Oil & Gas Operator | Aug 2020 |
| 302 | Eagle Resources Inc | Claremore, OK 74019-5398 | Oil & Gas Operator | May 2013 |
| 303 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | May 2025 |
| 304 | Eagle Road Oil LLC | Tulsa, OK 74103-3312 | Oil & Gas Operator | May 2025 |
| 305 | Earl Oil Inc | Stillwater, OK 74074-1079 | Oil & Gas Operator | Mar 2025 |
| 306 | Earl-Le Oil Company | Bristow, OK 74010-9547 | Oil & Gas Operator | Jun 2025 |
| 307 | Earlsboro Energies Corporation | Oklahoma City, OK 73116-3605 | Oil & Gas Operator | May 2025 |
| 308 | Edge Oil Company Inc | Cleveland, OK 74020-0284 | Oil & Gas Operator | Feb 2024 |
| 309 | Edinger Engineering, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 310 | Edmonds Management Company | Richardson, TX 75081 | Oil & Gas Operator | Mar 2015 |
| 311 | Eec Inc | Norman, OK 73069-6344 | Oil & Gas Operator | Jun 2025 |
| 312 | Egret Operating Company | Muskogee, OK 74401 | Oil & Gas Operator | May 2025 |
| 313 | Eig Petroleum LLC | Asheville, NC 28803-2908 | Oil Operator | Aug 2015 |
| 314 | Ekg Operating Inc | Seminole, OK 74818-1028 | Oil & Gas Operator | Nov 2015 |
| 315 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Jun 2025 |
| 316 | Elco Resources LLC | Owasso, OK 74055-7575 | Oil & Gas Operator | Jun 2025 |
| 317 | Elite Resources Inc | Cleveland, OK 74020 | Oil & Gas Operator | Jun 2025 |
| 318 | Elite Tank Trucks, Inc | | Oil & Gas Operator | Jun 2025 |
| 319 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Jul 2025 |
| 320 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 321 | Empire Petroleum Company | Houston, TX 77044 | Oil Operator | Mar 2011 |
| 322 | Enerfin Gathering-East LLC | Houston, TX 77077 | Oil & Gas Operator | Nov 2022 |
| 323 | Enerfin Resources I Limited Partnership | Houston, TX 77077-2386 | Oil & Gas Operator | Apr 2023 |
| 324 | Energex Corp | Springfield, MO 65807 | Oil & Gas Operator | May 2025 |
| 325 | Energex Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 326 | Energy Lease Service Inc | Drumright, OK 74030-7403 | Oil & Gas Operator | May 2025 |
| 327 | Energy Resources Dev Inc | Bixby, OK 74008-3658 | Oil & Gas Operator | May 2025 |
| 328 | Energy Support Services LLC | Cheyenne, WY 82001 | Oil & Gas Operator | Jan 2025 |
| 329 | Enersearch Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Dec 2013 |
| 330 | Enersource Petroleum Inc | Bixby, OK 74008 | Oil & Gas Operator | May 2025 |
| 331 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 332 | Enhanced Hydrocarbons Inc | Claremore, OK 74017 | Oil & Gas Operator | May 2013 |
| 333 | Ensource Inc | Midland, TX 79705 | Oil & Gas Operator | Aug 1998 |
| 334 | Enterprise Energy Exploration Inc | Tulsa, OK 74133-6724 | Oil & Gas Operator | Jun 2025 |
| 335 | Enterprise Exploration Inc | Tulsa, OK 74133 | Oil & Gas Operator | Nov 2020 |
| 336 | Enterprising Enterprises Inc | Tulsa, OK 74137 | Oil Operator | Jun 2009 |
| 337 | Eott Energy Operating LP | Houston, TX 77210-4666 | Oil & Gas Operator | Oct 2009 |
| 338 | Ernst Petroleum Company Inc | Arlington, VA 22201 | Oil & Gas Operator | Aug 2013 |
| 339 | Esenjay Exploration, Inc | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 340 | Esis Inc | | Oil & Gas Operator | Feb 2017 |
| 341 | Eslick Nancy Sue | Bristow, OK 74010-3873 | Oil Operator | Aug 2013 |
| 342 | Excel Operating Inc | Dallas, TX 75234-7300 | Oil & Gas Operator | Jun 2022 |
| 343 | Excel Production Inc | Lubbock, TX 79424-2341 | Oil Operator | Apr 2020 |
| 344 | Exok, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |
| 345 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 346 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Sep 2025 |
| 347 | Eyler Corporation | | Oil & Gas Operator | Nov 2012 |
| 348 | Eyler Dean E | Cleveland, OK 74020 | Oil & Gas Operator | May 2025 |
| 349 | Eyler Nelson E | | Oil Operator | Nov 1998 |
| 350 | Fairway Resources Inc | Jamestown, NY 14701 | Oil & Gas Operator | Dec 2024 |
| 351 | Falcon Oil Properties LLP | Bristow, OK 74010 | Oil Operator | May 2025 |
| 352 | Fallen Timbers Energy LLC | Tulsa, OK 74105-8713 | Oil Operator | Feb 2021 |
| 353 | Farley Christopher D | Kellyville, OK 74039 | Oil & Gas Operator | Jul 2019 |
| 354 | Federal Energy Development Co. | Dallas, TX 75205 | Oil & Gas Operator | Mar 2011 |
| 355 | Fell Oil And Gas Inc | Tulsa, OK 74157-9487 | Oil & Gas Operator | Aug 2016 |
| 356 | Fidgets Energy LLC | Checotah, OK 74426-5309 | Oil Operator | Oct 2024 |
| 357 | Finney Drilling Co. | Wann, OK 74083-2314 | Oil Operator | Jul 2018 |
| 358 | Firey Oil Company | Sand Springs, OK 74063 | Oil & Gas Operator | Feb 2021 |
| 359 | Fisher Ellis R | Bristow, OK 74010-8515 | Oil & Gas Operator | Dec 2015 |
| 360 | Fisher Ernest B | Bristow, OK 74010 | Oil Operator | Jul 2024 |
| 361 | Fitzsimmons Randall W & Deborah S | Bartelsville, OK 74006 | Oil & Gas Operator | Jun 2025 |
| 362 | Flatt Energy Inc | | Oil & Gas Operator | Sep 2019 |
| 363 | Fluor Oil & Gas Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2019 |
| 364 | Flying M Petroleum LLC | Bristow, OK 74010 | Oil & Gas Operator | May 2025 |
| 365 | Forest 1 Development Company | Denver, CO 80202-4966 | Oil & Gas Operator | Mar 2008 |
| 366 | Forrest A Ward | Okmulgee, OK 74447-8891 | Oil & Gas Operator | Dec 2024 |
| 367 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 368 | Freeman Oil Co | Midland, TX 79701 | Oil & Gas Operator | Sep 2014 |
| 369 | Freestone Resources, Inc | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 370 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 371 | Frierson & Kirchner | | Oil & Gas Operator | Mar 2007 |
| 372 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | May 2025 |
| 373 | G & G Services | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 1993 |
| 374 | G M G Oil & Gas Corp. | Morris, OK 74445 | Oil & Gas Operator | May 2025 |
| 375 | Ganer Oil Company | Blackwell, OK 74631-4221 | Oil & Gas Operator | Jan 2022 |
| 376 | Garvey Oil And Gas LLC | Kellyville, OK 74039-4428 | Oil & Gas Operator | Mar 2015 |
| 377 | Gaskins Glendell L | Slick, OK 74071 | Oil & Gas Operator | Jun 2025 |
| 378 | Gaskins William | Lincoln, NE 68516 | Oil Operator | Dec 1998 |
| 379 | Gazalski Richard S Dba Ski Energy | Henryetta, OK 74437-1208 | Oil & Gas Operator | Dec 2020 |
| 380 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | Jun 2025 |
| 381 | Gemini Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 382 | General Trading Co Inc | Carrollton, TX 75011-2309 | Oil Operator | Jul 2017 |
| 383 | Genesis Inc | Seminole, OK 74818-1647 | Oil & Gas Operator | Sep 2014 |
| 384 | Genzer Jim W | Sapulpa, OK 74067-1252 | Oil & Gas Operator | May 2013 |
| 385 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 386 | Gibson Les | Welty, OK 74833 | Oil & Gas Operator | Jun 2025 |
| 387 | Gill Jet C Dba Jetco Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2023 |
| 388 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 389 | Glendell L Gaskins Production LLC | Slick, OK 74071 | Oil & Gas Operator | Jun 2025 |
| 390 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | May 2025 |
| 391 | Glimp Oil Company | Drumright, OK 74030-0391 | Oil & Gas Operator | Mar 1998 |
| 392 | Glimp Oil Company LLC | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 393 | GMW Petroleum LLC | Skiatook, OK 74070 | Oil & Gas Operator | May 2025 |
| 394 | Gold-Mont Oil Company Inc | Tulsa, OK 74107 | Oil & Gas Operator | Nov 2015 |
| 395 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 396 | Gordon Robert Oil Company | Stroud, OK 74070-0366 | Oil & Gas Operator | Jul 2001 |
| 397 | Gore Sidney | Tulsa, OK 74101 | Oil & Gas Operator | Dec 2016 |
| 398 | Graves J M | Tulsa, OK 74105 | Oil & Gas Operator | Sep 2007 |
| 399 | Grayhorse Operating Inc | Tulsa, OK 74103-4439 | Oil & Gas Operator | May 2025 |
| 400 | Grayson Operating LLC | Ada, OK 74820 | Oil & Gas Operator | May 2025 |