| 601 | Martin Tank Truck & Casing Pulling Inc | Cushing, OK 74023 | Oil & Gas Operator | Apr 2015 |
| 602 | Martin Well Service | Graham, TX 76450 | Oil & Gas Operator | Jun 2015 |
| 603 | Martin Well Service Company | Mineral Wells, TX 76067 | Oil & Gas Operator | Jul 2006 |
| 604 | Martin'S Resources LLC | Woodward, OK 73801-5641 | Oil & Gas Operator | Feb 2026 |
| 605 | Martin, Bob | Wann, OK 74083 | Oil & Gas Operator | Sep 2007 |
| 606 | Martin, Dail D. | Madison, KS 66860 | Oil Operator | Dec 2019 |
| 607 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2026 |
| 608 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 609 | Martin, Landis | Geneva, NY 14456 | Gas Operator | Dec 2024 |
| 610 | Martin, Pat Jr. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2019 |
| 611 | Martin, Philip H. | Ellis, KS 67637 | Oil Operator | Apr 2000 |
| 612 | Martin, Tim | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2003 |
| 613 | Martin, William C. | Houston, TX 77071 | Oil & Gas Operator | Apr 2026 |
| 614 | Martin-Marks Operating Co. LLC | | Oil & Gas Operator | Dec 2010 |
| 615 | Martindale Enter | | Oil & Gas Operator | Oct 1996 |
| 616 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 617 | Martino, Joseph C. | Pasadena, TX 77504 | Oil & Gas Operator | Apr 2026 |
| 618 | Martis Valley Energy, LLC | Wichita Falls, TX 76310 | Oil Operator | Apr 2026 |
| 619 | Marvel Joseph Shawn | Haskell, OK 74436 | Oil Operator | Jan 2026 |
| 620 | Marvin L. Muslow | | Oil Operator | Jun 1995 |
| 621 | Marvin Sanders Oil | Sugar Grove, PA 16350-5612 | Oil & Gas Operator | Dec 2016 |
| 622 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 623 | Marwell Petroleum, Inc. | Houston, TX 77057 | Oil & Gas Operator | Apr 2006 |
| 624 | Mary E. Wertalla | | Oil Operator | Dec 1984 |
| 625 | Marymac Company | Dallas, TX 75219-2362 | Oil & Gas Operator | Mar 2015 |
| 626 | Marymac Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Sep 2001 |
| 627 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 628 | Masa Energy LLC | Houston, TX 77094 | Oil & Gas Operator | Apr 2026 |
| 629 | Masada Development Company | Lubbock, TX 79416 | Oil & Gas Operator | Nov 2021 |
| 630 | Masada Oil & Gas | Quanah, TX 79252 | Oil & Gas Operator | Apr 2026 |
| 631 | Masada Oil & Gas Company LTD. | Abilene, TX 79603 | Oil & Gas Operator | Apr 2026 |
| 632 | Mascorella, Timothy James | Java Center, NY 14082 | Gas Operator | Dec 2024 |
| 633 | Mascot Oil Company | Schulenburg, TX 78956 | Oil & Gas Operator | Apr 2026 |
| 634 | Masek Oil Compan | | Oil Operator | Feb 1984 |
| 635 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 636 | Masham Production Corporation | Enid, OK 73702 | Oil & Gas Operator | Aug 2000 |
| 637 | Mask Thomas B | | Oil & Gas Operator | Jul 1991 |
| 638 | Mask Thomas B And Markel Ray D And Wood K P | | Oil & Gas Operator | Aug 1986 |
| 639 | Mask Thomas B And Patrick Petroleum Corp | | Oil & Gas Operator | Jun 1992 |
| 640 | Maskeny Edward D | | Oil & Gas Operator | Jun 1998 |
| 641 | Mason Drilling Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2022 |
| 642 | Mason John C | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1994 |
| 643 | Mason Oil Company Inc | Nowata, OK 74048 | Oil Operator | Oct 2007 |
| 644 | Mason Oil Inc | Blanchard, OK 73010-2903 | Oil & Gas Operator | Feb 2009 |
| 645 | Mason Producing Inc | Millersburg, OH 44654-2696 | Oil & Gas Operator | Dec 2025 |
| 646 | Mason Robert A | | Oil Operator | May 1993 |
| 647 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 648 | Mason, Harold J. | Waterville, NY 13480 | Gas Operator | Dec 2024 |
| 649 | Mason, Tommy L | | Oil & Gas Operator | May 2013 |
| 650 | Mason-Phillips Properties Of Florida | Ville Beach, FL 32250 | Oil Operator | Apr 1999 |
| 651 | Mass Energy, Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 652 | Mass Resources, Inc. | | Oil Operator | Jan 2025 |
| 653 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 654 | Massad John M | Holdenville, OK 74848-2629 | Oil & Gas Operator | Oct 2017 |
| 655 | Massad Oil Company | Holdenville, OK 74848-2629 | Oil Operator | Feb 2026 |
| 656 | Massey Group, Inc. | | Oil & Gas Operator | Dec 2004 |
| 657 | Massey, Gary R. | Eureka, KS 67045 | Oil Operator | Dec 2025 |
| 658 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 659 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 660 | Mastel, Francis E. | Rantoul, KS 66079 | Oil Operator | Oct 2009 |
| 661 | Master Pet & Devel Co Inc | Grand Junction, CO 81503 | Oil & Gas Operator | Jul 1999 |
| 662 | Master Well Works, Inc. | | Oil Operator | Dec 2024 |
| 663 | Masters Dorothy V | Davis, OK 73030-0397 | Oil & Gas Operator | May 2020 |
| 664 | Masters Loy C | Davis, OK 73030-0397 | Oil & Gas Operator | Apr 2005 |
| 665 | Masters Oil & Gas, LLC | Houston, TX 77079 | Oil & Gas Operator | Apr 2026 |
| 666 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 667 | Masters Resources, L.L.C. | Houston, TX 77079 | Oil & Gas Operator | Dec 2008 |
| 668 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 669 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 670 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 671 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 672 | Matador Exploration, Inc. | Sedan, KS 67361 | Oil Operator | Apr 2001 |
| 673 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 674 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 675 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 676 | Matador, Inc. | Sedan, KS 67361 | Oil Operator | Aug 2025 |
| 677 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 678 | Materi Exploration Inc | Upton, WY 82730 | Oil Operator | Nov 2021 |
| 679 | Matherly Elaine | Bristow, OK 74010-9536 | Oil Operator | Mar 2015 |
| 680 | Mathews & Casselman Oil Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 681 | Mathews Billy J | Morris, OK 74445-4826 | Oil & Gas Operator | Dec 2025 |
| 682 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 683 | Mathews Roger Dba Mathews Oil/Trans Energy | Kellyville, OK 74039 | Oil Operator | Oct 2025 |
| 684 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Apr 2026 |
| 685 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 686 | Matlock, Randall K. | Topeka, KS 66607 | Oil Operator | May 2000 |
| 687 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Nov 2025 |
| 688 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Feb 2026 |
| 689 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 690 | Matrex LLC | | Gas Operator | May 2006 |
| 691 | Matriks Energy LLC | Ashland, KY 41102 | Gas Operator | Dec 2024 |
| 692 | Matrix Energy LLC | | Oil & Gas Operator | Apr 2013 |
| 693 | Matrix Exploration And Development LLC | | Oil & Gas Operator | Oct 2008 |
| 694 | Matrix New Mexico Operating Company LLC | Sugarland, TX 77479 | Oil & Gas Operator | Aug 2010 |
| 695 | Matrix Oil & Gas, Inc. | | Oil & Gas Operator | Jul 2001 |
| 696 | Matrix Oil Corporation | | Oil & Gas Operator | Dec 2025 |
| 697 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2026 |
| 698 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 699 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Feb 2026 |
| 700 | Matt Prod Enterprises | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2017 |