| 301 | Granite Oil Company | Austin, TX 78716 | Oil & Gas Operator | Nov 2000 |
| 302 | Graward Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 303 | Graystone Energy Corporation | Judson, TX 75660 | Oil & Gas Operator | May 2024 |
| 304 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | May 2024 |
| 305 | Gregg Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 306 | Greystone Oil & Gas, LLP | Houston, TX 77057 | Oil & Gas Operator | Dec 2015 |
| 307 | Griffith Resources | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2013 |
| 308 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 309 | Gulf States Petro. Corp. | Dallas, TX 75202 | Oil & Gas Operator | Apr 2006 |
| 310 | Gulfport Oil & Gas Inc. | Gulfport, MS 39501 | Oil & Gas Operator | May 2024 |
| 311 | Gulfstream Oil & Gas, Inc. | Allen, TX 75013 | Oil & Gas Operator | Jun 2018 |
| 312 | H & T Exploration, Inc. | Longview, TX 75605 | Oil & Gas Operator | May 2024 |
| 313 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 314 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 315 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | May 2024 |
| 316 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 317 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2024 |
| 318 | Hardy Ranch, Inc. | Henderson, TX 75654 | Oil & Gas Operator | May 2024 |
| 319 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | May 2024 |
| 320 | Harman Operating Company, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2007 |
| 321 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 322 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 323 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 324 | Heritage Energy Corporation | Waco, TX 76710 | Oil & Gas Operator | Sep 2004 |
| 325 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 326 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | May 2024 |
| 327 | Highmark Energy Operating, LLC | Poynor, TX 75782 | Oil & Gas Operator | May 2024 |
| 328 | Hightower Exploration | Kilgore, TX 75662 | Oil & Gas Operator | May 2024 |
| 329 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2024 |
| 330 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 331 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 332 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 333 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 334 | Holt Oil And Cattle LLC | Trout Run, PA 17771 | Oil & Gas Operator | May 2024 |
| 335 | Hombre Oil Co., LTD. | Tyler, TX 75713 | Oil & Gas Operator | Apr 2021 |
| 336 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 337 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 338 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 339 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 340 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | May 2024 |
| 341 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 342 | Hughey, Gaylord T. SR. Oper. Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1998 |
| 343 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 344 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2024 |
| 345 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2024 |
| 346 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 347 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 348 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 349 | Hydrocarbon Lease Management LTD | Addison, TX 75001 | Oil & Gas Operator | Jul 2002 |
| 350 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | May 2024 |
| 351 | Imagery Exploration, Inc. | Dallas, TX 75380 | Oil & Gas Operator | May 2024 |
| 352 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 353 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | May 2024 |
| 354 | Ironhorse Operations, LLC | Kilgore, TX 75663 | Oil Operator | May 2024 |
| 355 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 356 | J C Petroleum Inc | Chickasha, OK 73023-1433 | Oil & Gas Operator | Dec 2013 |
| 357 | J-Car Operating, Inc. | Lindale, TX 75771 | Oil & Gas Operator | Mar 1997 |
| 358 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | May 2024 |
| 359 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 360 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | May 2024 |
| 361 | Jandar Exploration, L. C. | Tyler, TX 75703 | Oil & Gas Operator | May 2024 |
| 362 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 363 | Jet Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2002 |
| 364 | John P. Bogdanich Operating, LLC | Kilgore, TX 75663 | Oil Operator | May 2024 |
| 365 | Jordan Properties | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 366 | Josey Oil Company | Houston, TX 77019 | Oil & Gas Operator | Jul 2006 |
| 367 | Josey, Lenoir M., Inc. | Houston, TX 77019 | Oil & Gas Operator | Aug 2003 |
| 368 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | May 2024 |
| 369 | K Me Company, LLC | Kilgore, TX 75663 | Oil Operator | May 2024 |
| 370 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 371 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2024 |
| 372 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 373 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | May 2024 |
| 374 | Katy Resources Etx, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2011 |
| 375 | Katy Resources LLC | Arlington, TX 76013 | Oil & Gas Operator | May 2024 |
| 376 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 377 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 378 | Kepa Energy, L.C. | Marshall, TX 75670 | Oil & Gas Operator | Mar 1998 |
| 379 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2023 |
| 380 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 381 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2017 |
| 382 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2024 |
| 383 | Keyway Oil & Gas Operating LLC | Kilgore, TX 75663 | Oil Operator | Oct 2020 |
| 384 | Kiamichi Oil & Gas | Whitehouse, TX 75791 | Oil Operator | Oct 1997 |
| 385 | Kimbell Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 386 | Kinder Morgan Production Co LLC | Midland, TX 79705 | Oil & Gas Operator | May 2024 |
| 387 | King Operating Corporation | Pampa, TX 79066 | Oil & Gas Operator | May 2024 |
| 388 | Kingwood Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | May 2022 |
| 389 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 390 | KJ Energy, LLC | MT Enterprise, TX 75681 | Oil & Gas Operator | May 2024 |
| 391 | Klo Oil & Gas, L.L.C. | Tulsa, OK 74120 | Oil & Gas Operator | Jan 2023 |
| 392 | L & L Resources, Inc. | Hays, KS 67601 | Oil Operator | Mar 1986 |
| 393 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 394 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 395 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | May 2024 |
| 396 | Lake Ronel Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Nov 2019 |
| 397 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 398 | Largo Oil Company | Longview, TX 75606 | Oil & Gas Operator | May 2024 |
| 399 | Lawton, Jack Inc. | Sulphur, LA 70663 | Oil & Gas Operator | Dec 1995 |
| 400 | Lease Holders Acquisitions LLC | Yukon, OK 73099 | Gas Operator | May 2024 |