| 301 | G & S Production Company | Velma, OK 73491-0036 | Oil & Gas Operator | Oct 2021 |
| 302 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 303 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 304 | G2GH Operating LLC | Edmond, OK 73003-3207 | Oil Operator | Apr 2025 |
| 305 | Gala Resources, LTD. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 306 | Gaskins Glendell L | Slick, OK 74071 | Oil & Gas Operator | Apr 2025 |
| 307 | Gaskins Ronnie Oil Production | Lawton, OK 73501-4529 | Oil Operator | Jun 2014 |
| 308 | Gate Oil And Gas LTD | Duncan, OK 73533 | Oil Operator | Jan 2004 |
| 309 | Gay Drilling Contractors | Duncan, OK 73534-0457 | Oil & Gas Operator | Dec 2014 |
| 310 | Gaylan Hunt Enterprises Inc | Duncan, OK 73533 | Oil & Gas Operator | Apr 2025 |
| 311 | Ge Oil & Gas LLC | Hastings, OK 73548-4904 | Oil & Gas Operator | Jan 2025 |
| 312 | Geo Engineering, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2009 |
| 313 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 314 | George Taylor & Sons Oil LLC | Ringling, OK 73456 | Oil Operator | Apr 2025 |
| 315 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 316 | Gilby Services LLC | Velma, OK 73491 | Oil & Gas Operator | Apr 2025 |
| 317 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Apr 2025 |
| 318 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | Apr 2025 |
| 319 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 320 | Golden Gas Energies Inc | | Oil & Gas Operator | Jan 1999 |
| 321 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Apr 2025 |
| 322 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 323 | Gouin Frank L | Oklahoma City, OK 73139-2513 | Oil Operator | Jan 2014 |
| 324 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 325 | Gravley Bill | Duncan, OK 73533 | Oil Operator | Nov 1998 |
| 326 | Gray Pipeline Inc | Broomfield, CO 80023-8304 | Oil & Gas Operator | Jul 2018 |
| 327 | Gray, Jimmy W | | Oil & Gas Operator | Aug 1998 |
| 328 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 329 | Gribble Jr R W | Dallas, TX 75235 | Oil & Gas Operator | Apr 2014 |
| 330 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 331 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 332 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 333 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 334 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 335 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Feb 2025 |
| 336 | Gulfport Midcon LLC | Oklahoma City, OK 73114-8132 | Oil & Gas Operator | Apr 2025 |
| 337 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |
| 338 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 339 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 340 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 341 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 342 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 343 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 344 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 345 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 346 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Mar 2025 |
| 347 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 348 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Mar 2025 |
| 349 | Hat-Top Production Co | Duncan, OK 73533 | Oil Operator | Apr 2011 |
| 350 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 351 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Apr 2025 |
| 352 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Mar 2025 |
| 353 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 354 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 355 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2025 |
| 356 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Mar 2025 |
| 357 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 358 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 359 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 360 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 361 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 362 | HMD Oil Co Inc | Ardmore, OK 73401-2542 | Oil & Gas Operator | Apr 2025 |
| 363 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 364 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 365 | Hogback Exploration Inc | Fort Smith, AR 72916 | Oil & Gas Operator | Apr 2025 |
| 366 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 367 | Holt Andrew L "Mickey" | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2008 |
| 368 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 369 | Hooks Dwain | Tatums, OK 73487 | Oil & Gas Operator | Apr 2025 |
| 370 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 371 | Howard & Taylor | Wynnewood, OK 73098-9234 | Oil & Gas Operator | Mar 2025 |
| 372 | Hub-Hill Inc | San Antonio, TX 78230 | Oil Operator | Nov 1998 |
| 373 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jun 2025 |
| 374 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 375 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 376 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 377 | Hunt Chris Water Hauling Contractor Inc | Keyes, OK 73947-0004 | Oil Operator | Jun 2008 |
| 378 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 379 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 380 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 381 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 382 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Jun 2025 |
| 383 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 384 | J & J Oil Company | Luling, TX 78648 | Oil & Gas Operator | Mar 2015 |
| 385 | J & K Production LLC | Konawa, OK 74849 | Oil Operator | Apr 2025 |
| 386 | J & S Oil Co | Graham, TX 76450 | Oil & Gas Operator | Apr 2022 |
| 387 | J C Petroleum Inc | Chickasha, OK 73023-1433 | Oil & Gas Operator | Dec 2013 |
| 388 | J D Sutton Inc | Loco, OK 73442-9701 | Oil & Gas Operator | Apr 2025 |
| 389 | Jack Oil Company | Baird, TX 79504 | Oil & Gas Operator | Apr 2025 |
| 390 | Jackson J M | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2005 |
| 391 | James Oil Company | Compton, CA 90221-4399 | Oil & Gas Operator | Nov 2008 |
| 392 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 393 | Jasmine Inc | Duncan, OK 73534-1103 | Oil & Gas Operator | Jun 2017 |
| 394 | Jaycar Production LLC | Comanche, OK 73529-4670 | Oil Operator | Mar 2025 |
| 395 | JB Smith Operating Co LLC | Duncan, OK 73533-4618 | Oil Operator | Apr 2025 |
| 396 | Jenkins & Sons Production, Inc. | Arkansas City, KS 67005 | Oil Operator | Jul 2014 |
| 397 | Jenkins Charley W Dba Jenkins Oil Company | Duncan, OK 73533-3204 | Oil Operator | Mar 2015 |
| 398 | Jenkins Energy Company | Comanche, OK 73529 | Oil Operator | Oct 2024 |
| 399 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Apr 2025 |
| 400 | Jim Bennett Oil Co Inc | | Oil & Gas Operator | Mar 2019 |