| 401 | J-E Production, Inc. | Midland, TX 79708 | Oil & Gas Operator | Mar 2008 |
| 402 | J. D. Gas, Inc. | Stephenville, TX 76401 | Oil & Gas Operator | Dec 2024 |
| 403 | Jasmar Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Mar 2008 |
| 404 | Jaxploration Company L.C. | Andrews, TX 79714 | Oil & Gas Operator | Dec 1995 |
| 405 | Jetta Operating Company Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 406 | Jim-Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2003 |
| 407 | JM Cox Resources LP | Midland, TX 79702 | Oil & Gas Operator | Apr 2019 |
| 408 | Jones, Charles E., Jr. | Odessa, TX 79760 | Oil & Gas Operator | Jul 2013 |
| 409 | Journey Operating, L.L.C. | Sugar Land, TX 77496 | Oil & Gas Operator | Aug 2006 |
| 410 | JTL Operating Co Inc | Katy, TX 77450 | Oil & Gas Operator | Dec 2024 |
| 411 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 412 | Karico GP, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 413 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Dec 2024 |
| 414 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 415 | Kendrick Oil And Gas Company | Abilene, TX 79608 | Oil & Gas Operator | Dec 2024 |
| 416 | Kenworthy Oil Company | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 417 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jun 2024 |
| 418 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 419 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 420 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jul 2024 |
| 421 | Kidd Oil & Gas, LC | Dallas, TX 75219 | Oil & Gas Operator | Apr 1999 |
| 422 | Kimbell Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2024 |
| 423 | Kimbrough Engineering Co, LLC | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2014 |
| 424 | Kinder Morgan Production Co LP | Midland, TX 79701 | Oil & Gas Operator | Jul 2007 |
| 425 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Dec 2024 |
| 426 | Kinney Incorporated | Andrews, TX 79714 | Oil & Gas Operator | Dec 2024 |
| 427 | La VIda Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 1993 |
| 428 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Dec 2024 |
| 429 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Dec 2024 |
| 430 | Latigo Petroleum Texas, LP | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 431 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Dec 2024 |
| 432 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2024 |
| 433 | Libertad Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 434 | Limark Corporation | Midland, TX 79702 | Oil & Gas Operator | Dec 2003 |
| 435 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 436 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 437 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 438 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 439 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 440 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 441 | Lion Production, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2006 |
| 442 | Live Oak Gas Company | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 443 | LNH Oil Company | Midland, TX 79708 | Oil & Gas Operator | Jan 2006 |
| 444 | Loin Energy Corporation | La Grange, TX 78945 | Oil & Gas Operator | Dec 2024 |
| 445 | Lomak Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1998 |
| 446 | Lothian Oil Texas I, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Mar 2008 |
| 447 | Lumbley, W. F. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2008 |
| 448 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 449 | Lynx Operating Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2024 |
| 450 | Lynx Petroleum Consultants Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2024 |
| 451 | LZB Energy, LLC | Austin, TX 78737 | Gas Operator | Jul 2020 |
| 452 | LZS Corporation | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2007 |
| 453 | M & M Production LTD. | Midland, TX 79704 | Oil & Gas Operator | Dec 2024 |
| 454 | M-C Production & Drilling Co,Inc | Longview, TX 75608 | Oil & Gas Operator | Dec 2024 |
| 455 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 456 | M. P. S. Prod. Co. | Houston, TX 77225 | Oil & Gas Operator | Dec 1996 |
| 457 | Mack Energy Corporation | Artesia, NM 88211 | Oil & Gas Operator | Oct 2024 |
| 458 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 459 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 460 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 461 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 462 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 463 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 464 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 465 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 466 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 467 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 468 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 469 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 470 | Maverick Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 471 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 472 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 473 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 474 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 475 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Dec 2024 |
| 476 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 477 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 478 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Dec 2024 |
| 479 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 480 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 481 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 482 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2024 |
| 483 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 484 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 485 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 486 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 487 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Dec 2024 |
| 488 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 489 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 490 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 491 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 492 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 493 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Dec 2024 |
| 494 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 495 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2024 |
| 496 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 497 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 498 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 499 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 500 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |