| 301 | GPM Gas Corporation | Oklahoma City, OK 73102-5627 | Oil & Gas Operator | Jun 2000 |
| 302 | Graham Oil And Gas, LTD. | Covington, LA 70434-3134 | Oil & Gas Operator | Aug 2013 |
| 303 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 304 | Green River Exploration Co | Tulsa, OK 74121-1468 | Oil & Gas Operator | Sep 2011 |
| 305 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Apr 2025 |
| 306 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Feb 2025 |
| 307 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Jan 2025 |
| 308 | Greenwood Energy Inc | Oklahoma City, OK 73116-9083 | Oil & Gas Operator | Mar 2015 |
| 309 | Greenwood Oil Company | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2013 |
| 310 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 311 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2025 |
| 312 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2025 |
| 313 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 314 | Gungoll Carl E Estate | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Aug 2000 |
| 315 | H & L Operating Co LLP | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 316 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 317 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Feb 2025 |
| 318 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 319 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 320 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 321 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Jan 2025 |
| 322 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2024 |
| 323 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 324 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Jan 2025 |
| 325 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Jan 2025 |
| 326 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 327 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 328 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 329 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 330 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 331 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 332 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 333 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 334 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2025 |
| 335 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 336 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Feb 2025 |
| 337 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 338 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 339 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 340 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 341 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 342 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 343 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 344 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Feb 2025 |
| 345 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 346 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 347 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 348 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 349 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2025 |
| 350 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 351 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 352 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 353 | Hurley Charles B | Santa Ana, CA 92706 | Oil & Gas Operator | Apr 2015 |
| 354 | Inca Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2009 |
| 355 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 356 | Indrex Inc | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2000 |
| 357 | Infinity Hydrocarbons LLC | Houston, TX 77079 | Oil & Gas Operator | Aug 2022 |
| 358 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 359 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Feb 2025 |
| 360 | Iochem Corporation | Oklahoma City, OK 73118-7483 | Oil & Gas Operator | Jan 2025 |
| 361 | J B Drilling Company Inc | Muldrow, OK 74948-6601 | Oil & Gas Operator | Jan 2025 |
| 362 | J D Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2005 |
| 363 | J L Hajek Enterprises LLC | Ames, OK 73718 | Oil & Gas Operator | Dec 2024 |
| 364 | J-Brex Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2025 |
| 365 | J-O Oil Co | | Oil & Gas Operator | Dec 2000 |
| 366 | Jakmen Inc | Edmond, OK 73034-5313 | Oil & Gas Operator | Jun 2015 |
| 367 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2025 |
| 368 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Jan 2025 |
| 369 | Jico Exploration Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2004 |
| 370 | Jma Energy Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2025 |
| 371 | Jma Resources, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Jan 2025 |
| 372 | Jobe Oil & Gas | Comanche, OK 73529-0244 | Oil & Gas Operator | Jan 2025 |
| 373 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2025 |
| 374 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 375 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2025 |
| 376 | Jones & Pellow Oil Co | Oklahoma City, OK 73118-1115 | Oil & Gas Operator | Feb 2015 |
| 377 | Jones Babe Inc | Floydada, TX 79235-0180 | Oil & Gas Operator | May 2019 |
| 378 | Jones Brent | Duncan, OK 73533-6608 | Oil & Gas Operator | Nov 2015 |
| 379 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2025 |
| 380 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jan 2025 |
| 381 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2025 |
| 382 | K-Tel Petroleum | Englewood, CO 80111-4628 | Oil & Gas Operator | Sep 2007 |
| 383 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 384 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2025 |
| 385 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 386 | Kenneth W. Cory, LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Jan 2025 |
| 387 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 388 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jan 2025 |
| 389 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Apr 2025 |
| 390 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2025 |
| 391 | Kibtec Oil & Gas Inc | Cashion, OK 73016 | Oil & Gas Operator | Aug 2024 |
| 392 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Jan 2025 |
| 393 | Kingfisher CSG Pullr & Const Inc | Hennessey, OK 73742-0024 | Oil & Gas Operator | Apr 2014 |
| 394 | Kingfisher Resources Inc | Clinton, OK 73601 | Oil & Gas Operator | Feb 2025 |
| 395 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 396 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 397 | Klingensmith Fred T Etal | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2007 |
| 398 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Feb 2025 |
| 399 | KNG Producers | Dumas, TX 79029 | Oil & Gas Operator | Oct 2009 |
| 400 | Koch Hydrocarbon Company | Wichita, KS 67220-3203 | Oil & Gas Operator | Nov 2014 |