| 301 | Flow Production Company | Midland, TX 79708 | Oil & Gas Operator | Mar 2005 |
| 302 | Focus Energy, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2019 |
| 303 | Foreman Enterprises Inc | Edmond, OK 73003 | Oil & Gas Operator | Sep 2025 |
| 304 | Formentera Operations LLC | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 305 | Fossil Fuels Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2000 |
| 306 | Four Seas Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Dec 2019 |
| 307 | Four-O-One Corporation | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2015 |
| 308 | FP Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2008 |
| 309 | Fpco Oil & Gas Co. | New Orleans, LA 70160 | Oil & Gas Operator | Jun 2025 |
| 310 | Fremont Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2004 |
| 311 | Fremont Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2014 |
| 312 | Frontier Operating Corporation | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 313 | Fuksa Investments Inc | Hennessey, OK 73742 | Oil & Gas Operator | Sep 2025 |
| 314 | Fuller Petroleum Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 315 | Fuller Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 316 | Gaedeke Oil & Gas Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Sep 2023 |
| 317 | Garrison Bros Pipe & Used Equip Inc | Hinton, OK 73047 | Oil & Gas Operator | Aug 2013 |
| 318 | Gary L. Deaton Corporation | Oklahoma City, OK 73105-3023 | Oil & Gas Operator | Mar 2015 |
| 319 | Gastar Exploration LLC | Tulsa, OK 74136-1921 | Oil & Gas Operator | Aug 2025 |
| 320 | Gda Investments Inc | Oklahoma City, OK 73123-0403 | Oil & Gas Operator | Sep 2025 |
| 321 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 322 | Genesis Energy Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 1995 |
| 323 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Aug 2025 |
| 324 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 325 | George H Russell Oil & Gas Investments Inc | Mustang, OK 73064 | Oil & Gas Operator | Oct 2023 |
| 326 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 327 | Gibbs Jr Charles E | Fort Worth, TX 76108-9418 | Oil & Gas Operator | Mar 2015 |
| 328 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Sep 2025 |
| 329 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Sep 2025 |
| 330 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Aug 2025 |
| 331 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 332 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 333 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Sep 2025 |
| 334 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 335 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 336 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 337 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 338 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 339 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 340 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 341 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 342 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 343 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 344 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 345 | Gulfstream Petroleum Corp | | Oil & Gas Operator | Feb 2002 |
| 346 | Gypsy Exploration LLC | Oklahoma City, OK 73123-1323 | Oil & Gas Operator | Dec 2014 |
| 347 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Sep 2025 |
| 348 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 349 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 350 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 351 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Jun 2025 |
| 352 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 353 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 354 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 355 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Aug 2025 |
| 356 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Aug 2025 |
| 357 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 358 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Aug 2025 |
| 359 | Haydens Oil And Gas LLC | Dover, OK 73734 | Oil & Gas Operator | Aug 2025 |
| 360 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Aug 2025 |
| 361 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 362 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 363 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 364 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 365 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 366 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 367 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 368 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 369 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 370 | Highland Minerals Inc | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 371 | Himco Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 372 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 373 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Sep 2025 |
| 374 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 375 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 376 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Sep 2025 |
| 377 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 378 | Honeymon Drilling Company LTD | Oklahoma City, OK 73147 | Oil & Gas Operator | Feb 1995 |
| 379 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 380 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 381 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 382 | Hsumy Oil & Gas, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 383 | Hughes Gas Systems LLC | Dallas, TX 75214 | Oil & Gas Operator | Aug 2025 |
| 384 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 385 | Hunt H L | Dallas, TX 75202-2785 | Oil & Gas Operator | Jan 2025 |
| 386 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 387 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 388 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Aug 2025 |
| 389 | Impact Energy Operating LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Oct 2025 |
| 390 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Dec 2025 |
| 391 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 392 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 393 | Jackson Petroleum Consult Inc | Dallas, TX 75287 | Oil & Gas Operator | Aug 1994 |
| 394 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Sep 2025 |
| 395 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 396 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 397 | JB Petroleum Corporation | Purcell, OK 73080-6954 | Oil & Gas Operator | Sep 2018 |
| 398 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Aug 2025 |
| 399 | JKB Resources LLC | Stigler, OK 74462 | Oil & Gas Operator | Aug 2025 |
| 400 | Jma Energy Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Sep 2025 |