| 301 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 302 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | May 2025 |
| 303 | Great Southwestern Expl Inc | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 304 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | May 2025 |
| 305 | Greenwood Energy Inc | Oklahoma City, OK 73116-9083 | Oil & Gas Operator | Mar 2015 |
| 306 | Greenwood Oil Company | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2013 |
| 307 | Greer Tom R | Ponca City, OK 74602-2444 | Oil & Gas Operator | May 2013 |
| 308 | Gross, Charles E. | Dallas, TX 75220 | Oil & Gas Operator | Feb 2012 |
| 309 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 310 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 311 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 312 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 313 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Jun 2025 |
| 314 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 315 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 316 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 317 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 318 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 319 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 320 | Harold M Root Foundation | | Oil Operator | Jun 2025 |
| 321 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 322 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Jun 2025 |
| 323 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Jun 2025 |
| 324 | Haught Harold | Hominy, OK 74035 | Oil Operator | Feb 2012 |
| 325 | Hayes & Hudson | Bartlesville, OK 74003 | Oil & Gas Operator | Jun 2025 |
| 326 | Hays Stanley L | Wynola, OK 74084 | Oil Operator | May 2022 |
| 327 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 328 | Heller, Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | May 2025 |
| 329 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 330 | Helmer Oil Corporation | | Oil & Gas Operator | Jun 2025 |
| 331 | Helmer, Bonnie J | | Oil Operator | Jun 2025 |
| 332 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Jun 2025 |
| 333 | Henley, VIola F | | Oil Operator | Jun 2025 |
| 334 | Henry Rennick | | Oil Operator | Jun 2025 |
| 335 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 336 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 337 | Hewitt, Douglas R | | Oil Operator | May 2025 |
| 338 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 339 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Jun 2025 |
| 340 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 341 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Jun 2025 |
| 342 | Hobo Oil & Gas | | Oil & Gas Operator | Aug 2013 |
| 343 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Jun 2025 |
| 344 | Holt Andrew L "Mickey" | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2008 |
| 345 | Holt James | Skiatook, OK 74070-0006 | Oil & Gas Operator | Feb 2020 |
| 346 | Horizon Barnsdall Energy Part LTD I Osage Only | | Oil Operator | Feb 2012 |
| 347 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 348 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 349 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 350 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Jun 2025 |
| 351 | Howell Jason | Wynona, OK 74084 | Oil Operator | Jun 2025 |
| 352 | Howell'S Well Service, Inc. | | Oil & Gas Operator | Jun 2025 |
| 353 | Hudgens Lester E | Bartlesville, OK 74006-0215 | Oil Operator | Mar 2015 |
| 354 | Hudson Energy LLC | | Oil Operator | Jun 2025 |
| 355 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 356 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 357 | Huitt Joe A Rev Trust | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2009 |
| 358 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 359 | Hulse Steve & Frank | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2000 |
| 360 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 361 | Hurd Oil Company | | Oil & Gas Operator | Jun 2015 |
| 362 | Hurricane Energy Corporation | | Oil & Gas Operator | Dec 2000 |
| 363 | Hutton Gas Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 364 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 365 | Igleheart Warren | Edmond, OK 73034-8964 | Oil & Gas Operator | Jun 2016 |
| 366 | Ikenberry Herman & Ikenberry | | Oil Operator | Jul 1999 |
| 367 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2025 |
| 368 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 369 | Indianola Oil Inc | Bartlesville, OK 74005 | Oil & Gas Operator | Aug 2000 |
| 370 | Ingersoll Oil Inc | Hominy, OK 74035 | Oil & Gas Operator | Jun 2000 |
| 371 | Ingersoll Rosinbaum Oil Inc | | Oil & Gas Operator | Jun 2025 |
| 372 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 373 | Iron Hawk Energy Group Joint Venture | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 374 | J B Hulet | | Oil & Gas Operator | Aug 2013 |
| 375 | J Hurd Oil LLC | | Oil Operator | Jun 2025 |
| 376 | J Petroleum, Inc. | San Antonio, TX 78247 | Oil & Gas Operator | Aug 2003 |
| 377 | J. C. Oil Company | Odessa, TX 79766 | Oil & Gas Operator | Mar 2015 |
| 378 | Jaco, Troy Inc. | Sherman, TX 75091 | Oil & Gas Operator | Sep 2025 |
| 379 | Jaed Oil Production Co Inc | Arkansas City, KS 67005-0902 | Oil & Gas Operator | Mar 2015 |
| 380 | James Oil Company | Compton, CA 90221-4399 | Oil & Gas Operator | Nov 2008 |
| 381 | James Raymond L | Sapulpa, OK 74066-8785 | Oil & Gas Operator | Jul 2025 |
| 382 | Jay B Harden | | Oil Operator | Jun 2025 |
| 383 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2025 |
| 384 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 385 | JBD Oklahoma, L.L.C. | | Oil & Gas Operator | Jun 2025 |
| 386 | Jeffries Pumping Service Inc | Guthrie, OK 73044-8761 | Oil & Gas Operator | Jun 2025 |
| 387 | Jenkins Charles L | Edmond, OK 73083-3610 | Oil Operator | Jul 1996 |
| 388 | Jesse T Hough Dba Box L Operating | Hominy, OK 74035 | Oil Operator | Jun 2025 |
| 389 | Jireh Resources LLC | Tulsa, OK 74170-1230 | Oil Operator | Jun 2025 |
| 390 | Jones & Buck Development, LLC | Sedan, KS 67361 | Oil & Gas Operator | Jun 2025 |
| 391 | Jones Jr Lee R | Sedan, KS 67361 | Oil & Gas Operator | Jun 2008 |
| 392 | Jones Michael | Pawhuska, OK 74056 | Oil Operator | Jan 1995 |
| 393 | Jones, Bobby E | | Oil Operator | Nov 2005 |
| 394 | Jovian Petroleum Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2016 |
| 395 | JSD Resources Corporation | Barnsdall, OK 74002-3272 | Oil & Gas Operator | May 2025 |
| 396 | K G Operating | Hennessey, OK 73742 | Oil & Gas Operator | May 1999 |
| 397 | K-C Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jan 2013 |
| 398 | Kahan And Associates, Inc | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 399 | Kantor Oil Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 400 | Kelley, Joseph R | | Oil & Gas Operator | May 2025 |