| 501 | Marline Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 502 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 503 | Marlow Environmental LLC | Duncan, OK 73533 | Oil Operator | May 2022 |
| 504 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 505 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 506 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 507 | Marmac Resources Co. | Los Angeles, CA 90027 | Oil & Gas Operator | Mar 2015 |
| 508 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 509 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 510 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 511 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 512 | Maroon Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Apr 2024 |
| 513 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 514 | Marple Petroleum LLC | Norman, OK 73070-4506 | Oil Operator | Dec 2023 |
| 515 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 516 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 517 | Marquis-Allred Eng Inc | | Oil & Gas Operator | Apr 1992 |
| 518 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 519 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 520 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 521 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 522 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 523 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 524 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 525 | Marsh Lonnie C | Konawa, OK 74849-4929 | Oil & Gas Operator | Jan 2024 |
| 526 | Marsh Oil & Gas Company | Pauls Valley, OK 73075-0726 | Oil & Gas Operator | Jan 2024 |
| 527 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2022 |
| 528 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2023 |
| 529 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 530 | Marshall & McCain | | Oil & Gas Operator | Oct 1988 |
| 531 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2024 |
| 532 | Marshall Crude Oil LLC | Crossett, AR 71635 | Oil Operator | Jan 2024 |
| 533 | Marshall Energy, Inc. | Dallas, TX 75243 | Oil & Gas Operator | May 1997 |
| 534 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jul 1992 |
| 535 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 536 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 537 | Marshall Oil, LLC | Eureka, KS 67045 | Oil Operator | Dec 2023 |
| 538 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 539 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 540 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 541 | Marshall Production Co Inc | | Oil & Gas Operator | Jun 1989 |
| 542 | Marshall R Young Oil Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1996 |
| 543 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 544 | Marshall Richard R | Jeromesville, OH 44840 | Oil & Gas Operator | Dec 2023 |
| 545 | Marshall Young Oil Co | | Oil & Gas Operator | Jan 2007 |
| 546 | Marshall, A. B. | Houston, TX 77050 | Oil & Gas Operator | Sep 1995 |
| 547 | Marshall, Dale | | Gas Operator | Dec 1995 |
| 548 | Marshall, David | | Oil Operator | Oct 2021 |
| 549 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 550 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Apr 2024 |
| 551 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Apr 2024 |
| 552 | Marshel Inv | | Oil Operator | Oct 1991 |
| 553 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2024 |
| 554 | Marshland Exploration Company | | Oil & Gas Operator | May 2006 |
| 555 | Martec Petroleum | | Oil Operator | Jan 1984 |
| 556 | Martens & Peck Operating Co | | Gas Operator | Feb 1997 |
| 557 | Martens & Peck Production Co | Denver, CO 80222 | Oil & Gas Operator | Feb 1997 |
| 558 | Martex Oil & Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Apr 2024 |
| 559 | Martin & Richards Oil Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 1995 |
| 560 | Martin Billy G | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 561 | Martin Bros. Oil | Graham, TX 76450 | Oil & Gas Operator | Dec 1993 |
| 562 | Martin Burt K | Henryetta, OK 74437 | Oil & Gas Operator | Jul 2008 |
| 563 | Martin Cannon Interests, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2024 |
| 564 | Martin Energy LLC | | Oil & Gas Operator | Apr 2023 |
| 565 | Martin Exploration | Westminster, CO 80030 | Oil & Gas Operator | Dec 1993 |
| 566 | Martin Exploration Co. | | Oil & Gas Operator | Mar 1986 |
| 567 | Martin Foree Operating II, LLC | Royse City, TX 75189 | Oil & Gas Operator | Apr 2024 |
| 568 | Martin Foree Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Apr 2024 |
| 569 | Martin Gas Sales, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | May 1993 |
| 570 | Martin J S Oil O | | Oil & Gas Operator | Apr 1991 |
| 571 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Jan 2024 |
| 572 | Martin John R | Cushing, OK 74023 | Oil & Gas Operator | Apr 1995 |
| 573 | Martin Larrey C | Marietta, OH 45750 | Oil & Gas Operator | Dec 2023 |
| 574 | Martin Larry And/Or Sheila Dba Three Stooges Oil | | Oil Operator | Jan 2024 |
| 575 | Martin Matrix Inc. | San Angelo, TX 76905 | Oil & Gas Operator | Apr 2024 |
| 576 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Jan 2024 |
| 577 | Martin Oil & Gas Co. | | Oil Operator | Jul 1981 |
| 578 | Martin Oil & Gas Inc. | Freer, TX 78357 | Oil & Gas Operator | Apr 2024 |
| 579 | Martin Oil Co. | Aspermont, TX 79502 | Oil & Gas Operator | Jul 2023 |
| 580 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Dec 2023 |
| 581 | Martin Oil Produ | | Oil & Gas Operator | Dec 1994 |
| 582 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 583 | Martin Oil Properties | | Oil Operator | Dec 2009 |
| 584 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 585 | Martin Phillips | | Oil Operator | Dec 1987 |
| 586 | Martin Production Company | | Oil & Gas Operator | Dec 2023 |
| 587 | Martin Production Corporation | Graham, TX 76450-0569 | Oil Operator | Jan 2024 |
| 588 | Martin Tank Truck & Casing Pulling Inc | Cushing, OK 74023-0383 | Oil & Gas Operator | Apr 2015 |
| 589 | Martin Well Service | Graham, TX 76450 | Oil & Gas Operator | Jun 2015 |
| 590 | Martin'S Resources LLC | | Oil & Gas Operator | Dec 2023 |
| 591 | Martin, Bob | Wann, OK 74083 | Oil & Gas Operator | Sep 2007 |
| 592 | Martin, Dail D. | Madison, KS 66860 | Oil Operator | Dec 2019 |
| 593 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Apr 2024 |
| 594 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 595 | Martin, Landis | Geneva, NY 14456 | Gas Operator | Dec 2022 |
| 596 | Martin, Pat Jr. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2019 |
| 597 | Martin, Philip H. | Ellis, KS 67637 | Oil Operator | Apr 2000 |
| 598 | Martin, Tim | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2003 |
| 599 | Martin, Trey Oil Company | Louann, AR 71751 | Oil Operator | Feb 2024 |
| 600 | Martin, Van Jr | | Oil & Gas Operator | Feb 2024 |