| 301 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 302 | Fpco Oil & Gas Co. | New Orleans, LA 70160 | Oil & Gas Operator | Jun 2025 |
| 303 | Franks Oil & Gas Inc | Cookson, OK 74427-0310 | Oil & Gas Operator | Oct 1998 |
| 304 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 305 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 306 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | Oct 2025 |
| 307 | G & S Production Company | Velma, OK 73491-0036 | Oil & Gas Operator | Oct 2021 |
| 308 | G2GH Operating LLC | Edmond, OK 73003-3207 | Oil Operator | Sep 2025 |
| 309 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 310 | Gary L. Deaton Corporation | Oklahoma City, OK 73105-3023 | Oil & Gas Operator | Mar 2015 |
| 311 | Gay Drilling Contractors | Duncan, OK 73534-0457 | Oil & Gas Operator | Dec 2014 |
| 312 | Ge Oil & Gas LLC | Hastings, OK 73548-4904 | Oil & Gas Operator | Jan 2025 |
| 313 | General Minerals Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2015 |
| 314 | Genesis Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 1995 |
| 315 | Geo Exploration LLC | Oklahoma City, OK 73120-7116 | Oil & Gas Operator | Jun 2024 |
| 316 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 317 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 318 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 319 | Gilby Services LLC | Velma, OK 73491 | Oil & Gas Operator | Sep 2025 |
| 320 | Gilco Oil Inc | Ada, OK 74820 | Oil & Gas Operator | May 2019 |
| 321 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Oct 2025 |
| 322 | Gla Inc | Norman, OK 73070 | Oil & Gas Operator | Sep 2025 |
| 323 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Oct 2025 |
| 324 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | Oct 2025 |
| 325 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 326 | Global Natural Res Corp | Houston, TX 77210 | Oil & Gas Operator | Dec 1994 |
| 327 | Goggans William C | Pauls Valley, OK 73075-9759 | Oil & Gas Operator | Jun 2004 |
| 328 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 329 | Good Vaughn Oil Company LLC | Enid, OK 73702-3744 | Oil & Gas Operator | Jun 2019 |
| 330 | Goodrich Larkin M | Konawa, OK 74849-9766 | Oil Operator | Jan 2013 |
| 331 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 332 | Gordon Robert Oil Company | Stroud, OK 74070-0366 | Oil & Gas Operator | Jul 2001 |
| 333 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Oct 2025 |
| 334 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 335 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 336 | Grand Production Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2000 |
| 337 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2025 |
| 338 | Gray Operating Company, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2018 |
| 339 | Gray, Jimmy W | | Oil & Gas Operator | Aug 1998 |
| 340 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 341 | Great Western Equipment Co | Mustang, OK 73064 | Oil & Gas Operator | Oct 2025 |
| 342 | Green'S Drillng & Mud Ser Inc | Konawa, OK 74849 | Oil Operator | Jan 2013 |
| 343 | Greer & Beckham Gas Co Inc | Shamrock, TX 79079-0606 | Oil & Gas Operator | Aug 2013 |
| 344 | Greystone Exploration Co | Oklahoma City, OK 73177 | Oil & Gas Operator | Apr 1996 |
| 345 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 346 | Gugli Corporation | Byng, OK 74820 | Oil & Gas Operator | Sep 2014 |
| 347 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 348 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 349 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 350 | Gulfport Midcon LLC | Oklahoma City, OK 73114-8132 | Oil & Gas Operator | Oct 2025 |
| 351 | H & H Drilling Company | Davis, OK 73030-2703 | Oil & Gas Operator | May 2014 |
| 352 | H & H Energy Inc | Tuttle, OK 73089 | Oil Operator | May 2001 |
| 353 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Oct 2025 |
| 354 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Oct 2025 |
| 355 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 356 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 357 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Sep 2025 |
| 358 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 359 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 360 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 361 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 362 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 363 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Oct 2025 |
| 364 | Harrison Oil | Lindsay, OK 73052 | Oil & Gas Operator | Nov 2014 |
| 365 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 366 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 367 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 368 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 369 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 370 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 371 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Oct 2025 |
| 372 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 373 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 374 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2025 |
| 375 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 376 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Dec 2025 |
| 377 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 378 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 379 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 380 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Oct 2025 |
| 381 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 382 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 383 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 384 | Hoke Jr J T | Edmond, OK 73034 | Oil Operator | Nov 1998 |
| 385 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 386 | Hollrah Exploration Company | Edmond, OK 73012 | Oil & Gas Operator | Sep 2025 |
| 387 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 388 | Hooks Dwain | Tatums, OK 73487 | Oil & Gas Operator | Aug 2025 |
| 389 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 390 | Howard & Taylor | Wynnewood, OK 73098 | Oil & Gas Operator | Oct 2025 |
| 391 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 392 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Aug 2025 |
| 393 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 394 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 395 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 396 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2025 |
| 397 | Hyperion Oil & Gas LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 398 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 399 | Indian Territory Operating LLC | Salado, TX 76571 | Oil & Gas Operator | Jun 2025 |
| 400 | Inter-States Oil & Gas Inc | Edmond, OK 73003-0023 | Oil & Gas Operator | Apr 2020 |