| 501 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 502 | McCasland Management Inc | Hobbs, NM 88240 | Oil & Gas Operator | Aug 2020 |
| 503 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 504 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 505 | McElvain Energy Inc | Denver, CO 80265 | Oil & Gas Operator | Nov 2019 |
| 506 | McGowan Working Partners, Inc. | Jackson, MS 39296 | Oil & Gas Operator | Jul 2025 |
| 507 | McKay Oil Corp | Roswell, NM 88202 | Oil & Gas Operator | Aug 2017 |
| 508 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 509 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Jul 2025 |
| 510 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 511 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 512 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 513 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 514 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 515 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | May 2025 |
| 516 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jul 2025 |
| 517 | Meteor Developments Inc | Denver, CO BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 518 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 519 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 520 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Jul 2025 |
| 521 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 522 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 523 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 524 | Milford Oil Co | Tatum, NM 88267 | Oil & Gas Operator | Feb 1995 |
| 525 | Miller Oil & Gas Assets III, LLC | Englewood, CO 80155 | Oil & Gas Operator | May 2012 |
| 526 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 527 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jul 2025 |
| 528 | Mirage Energy Inc | Eunice, NM 88231 | Oil & Gas Operator | Apr 2011 |
| 529 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 530 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | May 2025 |
| 531 | Mobil Producing Texas & New Mexico | Denver City, TX 79323 | Oil & Gas Operator | Jun 2005 |
| 532 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 533 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 534 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 535 | Morexco Inc | Midland, TX 79710 | Oil & Gas Operator | Mar 2019 |
| 536 | Morgan Operating, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Oct 2024 |
| 537 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 538 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 539 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | Jul 2025 |
| 540 | Mr NM Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 541 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 542 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 543 | Murphy Operating Corp | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 544 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 545 | Nadel And Gussman Heyco, LLC | Roswell, NM 88202 | Oil & Gas Operator | Dec 2014 |
| 546 | Nadel And Gussman Permian,L.L.C. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 547 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 2025 |
| 548 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Jul 2025 |
| 549 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 550 | New Tex Oil Co | Hobbs, NM 88240 | Oil & Gas Operator | May 2016 |
| 551 | Newfield Exploration Mid-Continent Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2011 |
| 552 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | Jul 2025 |
| 553 | NMR Energy LLC | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 554 | Noble Operating, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2013 |
| 555 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Jul 2025 |
| 556 | North Fork Operating LP | Mustang, OK 73064 | Oil & Gas Operator | Jul 2025 |
| 557 | North Lea Energy Co., LLC | Crossroads, NM 88114 | Oil & Gas Operator | Jan 2025 |
| 558 | Northern Pacific Oil And Gas Incorporated | Houston, TX 77024 | Oil & Gas Operator | Dec 2022 |
| 559 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 560 | Northport Production Company | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2025 |
| 561 | Northstar Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 562 | Novo Oil & Gas Northern Delaware, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 563 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Jun 2025 |
| 564 | O H Berry | Midland, TX 79702 | Oil & Gas Operator | Feb 2003 |
| 565 | O'Neil Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Jun 2015 |
| 566 | O. H. B. Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Sep 2019 |
| 567 | Occidental Permian LTD. | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 568 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 569 | Ogs Operating Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2008 |
| 570 | Oil & Gas Operations | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 571 | Ok Operating Co | Midland, TX 79702 | Oil & Gas Operator | Aug 1999 |
| 572 | Oleum Energy LLC | Georgetown, TX 78628 | Oil & Gas Operator | May 2025 |
| 573 | Olsen Energy Inc. | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 574 | Oneenergy Partners Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Nov 2018 |
| 575 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 576 | Opal Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 577 | Orbit Enterprises, Inc. | Lovington, NM 88260 | Oil & Gas Operator | Mar 2015 |
| 578 | Orbit Petroleum, Inc. | Irving, TX 75038 | Oil & Gas Operator | Sep 2010 |
| 579 | Orion Oil & Gas Prop | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 580 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 581 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Jun 2025 |
| 582 | Ostrich Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 583 | Owens Pet Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 584 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 585 | Oxy USA WTP Limited Partnership | Houston, TX 772104294 | Oil & Gas Operator | May 2025 |
| 586 | Paladin Energy Corp. | Dallas, TX 75229 | Oil & Gas Operator | Jul 2017 |
| 587 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 588 | Paloma Permian Assetco, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 589 | Paloma Resources Inc | Roswell, NM 88201 | Oil & Gas Operator | Dec 1998 |
| 590 | Patterson Operating & Pumping Inc Dba/Penergy | Midland, TX 79710 | Oil & Gas Operator | Jul 2018 |
| 591 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 592 | Pbex Operations, LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 593 | Pecos Operating Company, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2021 |
| 594 | Pecos Production Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2005 |
| 595 | Pecos River Op Inc | Roswell, NM 88202 | Oil & Gas Operator | Dec 2020 |
| 596 | Pennzenergy Exploration & Production LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 597 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | May 2025 |
| 598 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 599 | Percussion Petroleum Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2019 |
| 600 | Permian Resources Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |