| 401 | Hilltop Petroleum LLC | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 402 | Holli-Tex Supply Co. | Holliday, TX 76366 | Oil & Gas Operator | May 2018 |
| 403 | Holliday CSG Corp. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 404 | Horn, W. J. | Graham, TX 76450 | Oil & Gas Operator | Oct 2004 |
| 405 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil Operator | Mar 2025 |
| 406 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2025 |
| 407 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 408 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2025 |
| 409 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 410 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 411 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 412 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Mar 2025 |
| 413 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 414 | Incendium Resources LLC | Argyle, TX 76226 | Oil & Gas Operator | Mar 2025 |
| 415 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2025 |
| 416 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Mar 2025 |
| 417 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Mar 2025 |
| 418 | Ipr Energy Partners, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2014 |
| 419 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Mar 2025 |
| 420 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Mar 2025 |
| 421 | J & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Mar 2025 |
| 422 | J & J Operating | Graford, TX 76449 | Oil & Gas Operator | Mar 2025 |
| 423 | J B J Oil Properties, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 424 | J Bar D | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 425 | J. K. J. Company | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 426 | J.A.G. Oil & Gas | La Vernia, TX 78121 | Oil & Gas Operator | Mar 2025 |
| 427 | J.A.M. Production | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 428 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | Mar 2025 |
| 429 | Jackson Investments | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 430 | Jackson, D. L., & Son | Jacksboro, TX 76458 | Oil & Gas Operator | May 2001 |
| 431 | Jay Management Company LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 432 | Jay Resources Corporation | Houston, TX 77010 | Oil & Gas Operator | Feb 1998 |
| 433 | JCS Company | Graham, TX 76450 | Oil & Gas Operator | May 2001 |
| 434 | JDL Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 435 | Jeff Dooley Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 436 | Jess Energy Company | Tyler, TX 75710 | Oil & Gas Operator | Sep 1997 |
| 437 | Jim Production | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2010 |
| 438 | JJB Operating Co. | Mineral Wells, TX 76068 | Oil & Gas Operator | Mar 2025 |
| 439 | Johnson, William D. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2008 |
| 440 | Jonco | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 441 | JRJ Oil & Gas LLC | Grapevine, TX 76099 | Oil & Gas Operator | Mar 2025 |
| 442 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 443 | JW Energy Co., LTD | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 444 | K Cubed Resources, L.L.C. | Burleson, TX 76028 | Oil & Gas Operator | Mar 2025 |
| 445 | K&C Pump Truck, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2018 |
| 446 | K-B Oil Company | Dallas, TX 75243 | Oil & Gas Operator | Dec 2020 |
| 447 | K-B Oil Company, LLC | Dallas, TX 75243 | Oil & Gas Operator | Mar 2025 |
| 448 | Kadane Corporation | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 449 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 450 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2025 |
| 451 | Kana Resources, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Aug 2003 |
| 452 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 453 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 454 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 455 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 456 | Kimleco Petroleum, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2025 |
| 457 | Kinder & Petty | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 458 | Kiva Resources Inc. | Houston, TX 77265 | Oil & Gas Operator | Mar 2008 |
| 459 | Klabzuba Royalty Company | Prague, OK 74864-0567 | Oil & Gas Operator | Dec 2019 |
| 460 | Knight, Reuben B. | Windthorst, TX 76389 | Oil & Gas Operator | Mar 2025 |
| 461 | Kramer Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 462 | Kramer, Frank & Ethel FLP | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 463 | Kramer, Frank C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 464 | Kroh Operating LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Mar 2025 |
| 465 | L & J Oil | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2000 |
| 466 | L-Reno Oil And Gas LLC | Graford, TX 76449 | Oil & Gas Operator | Mar 2025 |
| 467 | La Jolla Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Mar 2025 |
| 468 | Lakota Energy, LTD. | Paradise, TX 76073 | Oil & Gas Operator | Mar 2025 |
| 469 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 470 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 471 | Lankford, Dan L. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 472 | Larance Engineering Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Jan 1996 |
| 473 | Large Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Mar 2025 |
| 474 | Lariat Resources, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | May 2022 |
| 475 | Legacy Exploration, LLC I | Dallas, TX 75201 | Oil & Gas Operator | Mar 2025 |
| 476 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Mar 2025 |
| 477 | Lesikar, L. W. | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2006 |
| 478 | Levens, C. H. | Water Valley, TX 76958 | Oil & Gas Operator | May 2010 |
| 479 | Lewis Heirs 480, LLC | Bryson, TX 76427 | Oil & Gas Operator | Mar 2025 |
| 480 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Mar 2025 |
| 481 | Lewis Petro Properties, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 482 | Lewis, William T. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 483 | Lex And Lace Petroleum, LLC | Southlake, TX 76092 | Oil Operator | Mar 2025 |
| 484 | Lexgas, Inc. | Roanoke, TX 76262 | Oil & Gas Operator | Mar 2025 |
| 485 | Lexus Gas Corporation | Roanoke, TX 76262 | Oil & Gas Operator | Jul 2005 |
| 486 | Lindemann, James D. | Holliday, TX 76366 | Oil & Gas Operator | Mar 2008 |
| 487 | Little Drop Oil Company | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 488 | Littlepage, Tommy | Graham, TX 76450 | Oil & Gas Operator | May 1996 |
| 489 | LKM Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2024 |
| 490 | LKM Oil And Gas LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 491 | Lode Holdings, LLC | Wichita Falls, TX 76301 | Oil Operator | Mar 2025 |
| 492 | London Petroleum Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 493 | Long, Edgar E. | Windthorst, TX 76389 | Oil & Gas Operator | Oct 2011 |
| 494 | Longhorn Oil Properties, Inc. | Pottsboro, TX 75076 | Oil & Gas Operator | Mar 2025 |
| 495 | Lorac, Inc. | Dallas, TX 75252 | Oil & Gas Operator | Mar 2025 |
| 496 | Lowrance, Gene | Chico, TX 76431 | Oil & Gas Operator | Aug 2003 |
| 497 | Lufkin Production Company Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2025 |
| 498 | Lynco Production Company | Dallas, TX 75243 | Oil & Gas Operator | Nov 1999 |
| 499 | Lynn Creek Energy | McKinney, TX 75071 | Oil & Gas Operator | Nov 2015 |
| 500 | Lynn Creek Oil Company | Allen, TX 75002 | Oil & Gas Operator | Apr 2020 |