| 18401 | Marion Energy Inc | Houston, TX 770082292 | Oil & Gas Operator | May 2015 |
| 18402 | Marion Operating Corp | Marion, OH 43301-0453-0453 | Oil & Gas Operator | Dec 2020 |
| 18403 | Mariposa Petroleum Co. | | Gas Operator | Dec 1980 |
| 18404 | Maritech Resources, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2009 |
| 18405 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 18406 | Marjac Energy Co | Bremen, OH 43107 | Oil & Gas Operator | Dec 1986 |
| 18407 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 18408 | Marjo Incorporat | | Oil & Gas Operator | Jun 1990 |
| 18409 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 18410 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jan 2025 |
| 18411 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 18412 | Marjo, Inc. | | Oil & Gas Operator | Sep 1991 |
| 18413 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2024 |
| 18414 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 18415 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Feb 2025 |
| 18416 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 18417 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Jan 2025 |
| 18418 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 18419 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 18420 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 18421 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Feb 2025 |
| 18422 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | May 2024 |
| 18423 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 18424 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 18425 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 18426 | Mark Seifer | | Oil & Gas Operator | Dec 2024 |
| 18427 | Mark T. Kellner Oil Co. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 18428 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 18429 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 18430 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 18431 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 18432 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2025 |
| 18433 | Markham, Charles A., Jr. & Janet E. | Gowanda, NY 14070 | Gas Operator | Dec 2023 |
| 18434 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 18435 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18436 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 18437 | Marks And Garner Production LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Sep 2010 |
| 18438 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 18439 | Marksmen Energy USA Inc | Worthington, OH 43085-1270-1270 | Oil Operator | Dec 2020 |
| 18440 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Feb 2025 |
| 18441 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 18442 | Markwell Jr Ed L | | Oil & Gas Operator | Oct 1998 |
| 18443 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 18444 | Marlan Anderson | | Oil Operator | Jan 2025 |
| 18445 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 18446 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 18447 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 18448 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 18449 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 18450 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Apr 2025 |
| 18451 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 18452 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 18453 | Marlin Exploration, LLC | | Oil & Gas Operator | Jan 2025 |
| 18454 | Marlin Oil & Gas | Pawhuska, OK 74056 | Oil Operator | Jan 2025 |
| 18455 | Marlin Oil Company LLC | Gillette, WY 82718 | Oil & Gas Operator | Mar 2023 |
| 18456 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2025 |
| 18457 | Marlin Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jan 2025 |
| 18458 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 18459 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 18460 | Marline Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 18461 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 18462 | Marlow Environmental LLC | Marlow, OK 73055 | Oil Operator | May 2022 |
| 18463 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 18464 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 18465 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 18466 | Marmac Resources Co. | Los Angeles, CA 90027 | Oil & Gas Operator | Mar 2015 |
| 18467 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 18468 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 18469 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 18470 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 18471 | Maroon Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Apr 2025 |
| 18472 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 18473 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | Feb 2025 |
| 18474 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 18475 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 18476 | Marquis-Allred Eng Inc | | Oil & Gas Operator | Apr 1992 |
| 18477 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 18478 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 18479 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 18480 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 18481 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 18482 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 18483 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 18484 | Marsh Lonnie C | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 18485 | Marsh Oil & Gas Company | Pauls Valley, OK 73075 | Oil & Gas Operator | Jan 2025 |
| 18486 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2023 |
| 18487 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2024 |
| 18488 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 18489 | Marshall & McCain | | Oil & Gas Operator | Oct 1988 |
| 18490 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2025 |
| 18491 | Marshall Energy, Inc. | Dallas, TX 75243 | Oil & Gas Operator | May 1997 |
| 18492 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jun 1992 |
| 18493 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 18494 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 18495 | Marshall Oil, LLC | Eureka, KS 67045 | Oil Operator | Dec 2024 |
| 18496 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 18497 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 18498 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 18499 | Marshall Production Co Inc | | Oil & Gas Operator | Jun 1989 |
| 18500 | Marshall R Young Oil Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1996 |