| 301 | Gas Development Corp. | Broken Arrow, OK 74012 | Oil & Gas Operator | Mar 2015 |
| 302 | Gasanadarko LTD | Oklahoma City, OK 73116 | Gas Operator | May 1994 |
| 303 | Ge Oil & Gas LLC | Hastings, OK 73548-4904 | Oil & Gas Operator | Jan 2025 |
| 304 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 305 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 306 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 307 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 308 | Geoex Resources Inc | | Oil & Gas Operator | Jan 1997 |
| 309 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 310 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Mar 2025 |
| 311 | Golden Circle Production Co | Seminole, OK 74868 | Oil & Gas Operator | May 2002 |
| 312 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 313 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Mar 2025 |
| 314 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Mar 2025 |
| 315 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 316 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 317 | Grace Energy Management Inc | Cement, OK 73017 | Oil Operator | Mar 2025 |
| 318 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 319 | Grand Production Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2000 |
| 320 | Gravley Bill | Duncan, OK 73533 | Oil Operator | Nov 1998 |
| 321 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2025 |
| 322 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | May 2025 |
| 323 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 324 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 325 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 326 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Feb 2025 |
| 327 | Gulfport Midcon LLC | Oklahoma City, OK 73114-8132 | Oil & Gas Operator | Mar 2025 |
| 328 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | Mar 2025 |
| 329 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 330 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 331 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 332 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 333 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 334 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 335 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Feb 2025 |
| 336 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 337 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2025 |
| 338 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Feb 2025 |
| 339 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Feb 2025 |
| 340 | Haydens Oil And Gas LLC | Dover, OK 73734 | Oil & Gas Operator | Feb 2025 |
| 341 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Mar 2025 |
| 342 | Hazlewood Oil & Gas Co Inc | Oklahoma City, OK 73139-9353 | Oil & Gas Operator | Apr 2022 |
| 343 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 344 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2025 |
| 345 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Feb 2025 |
| 346 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 347 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 348 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 349 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 350 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 351 | Highland Minerals, Inc. | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 352 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 353 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 354 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Mar 2025 |
| 355 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 356 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 357 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Feb 2025 |
| 358 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 359 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 360 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 361 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 362 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 363 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 364 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 365 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2025 |
| 366 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 367 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2025 |
| 368 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 369 | Indian Wells Oil Co | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2000 |
| 370 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 371 | J C Petroleum Inc | Chickasha, OK 73023-1433 | Oil & Gas Operator | Dec 2013 |
| 372 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Mar 2025 |
| 373 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 374 | JCN Petroleum Corporation | Edmond, OK 73083-3357 | Oil & Gas Operator | Jun 2004 |
| 375 | Jec Operating LLC | Oklahoma City, OK 73114-2717 | Oil & Gas Operator | Feb 2025 |
| 376 | Jerry Sanner Oil Properties Inc | Enid, OK 73701 | Oil & Gas Operator | Mar 2025 |
| 377 | Jimmy R Chatham LLC | Healdton, OK 73438 | Oil & Gas Operator | Mar 2025 |
| 378 | Jma Energy Company, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2025 |
| 379 | Johnson E Lyle | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2025 |
| 380 | Johnson Exploration Company | Oklahoma City, OK 73102-7008 | Oil & Gas Operator | Jun 2015 |
| 381 | Johnson Jr Russell V | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 1992 |
| 382 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2025 |
| 383 | Jones Energy LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 384 | Jones Jay D Revocable Inter VIvos Trust | Duncan, OK 73534 | Oil & Gas Operator | Mar 2015 |
| 385 | Jones, Margo B | | Oil Operator | Nov 1998 |
| 386 | Jones, Mildred J | | Oil & Gas Operator | May 2006 |
| 387 | K Phil Fleetwood Oil Properties LLC | Marlow, OK 73055 | Oil & Gas Operator | Mar 2025 |
| 388 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Feb 2025 |
| 389 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 390 | Kalkman Oil Corporation | Duncan, OK 73533 | Oil & Gas Operator | Feb 2025 |
| 391 | Kamco Hot Oil Service Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2025 |
| 392 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Feb 2025 |
| 393 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 394 | Kechi Energy LLC | Chickasha, OK 73018 | Oil & Gas Operator | Mar 2025 |
| 395 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2025 |
| 396 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 397 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 398 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |
| 399 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 400 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | May 2025 |