| 18701 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 18702 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Feb 2026 |
| 18703 | Marietta Royalty Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | Dec 1986 |
| 18704 | Marina Pacifica Oil Company | | Oil & Gas Operator | Dec 1981 |
| 18705 | Marine Cont. & Supply Inc. | | Oil & Gas Operator | Nov 1985 |
| 18706 | Marine Properties, Inc. | | Oil & Gas Operator | Feb 1995 |
| 18707 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 18708 | Marino, Charles B. | Tomball, TX 77377 | Oil & Gas Operator | Feb 2026 |
| 18709 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 18710 | Marion County Prod. Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 18711 | Marion Energy Inc | Houston, TX 770082292 | Oil & Gas Operator | May 2015 |
| 18712 | Marion Operating Corp | Marion, OH 43301 | Oil & Gas Operator | Dec 2020 |
| 18713 | Mariposa Petroleum Co. | | Gas Operator | Dec 1980 |
| 18714 | Maritech Resources, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2009 |
| 18715 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 18716 | Marjac Energy Co | Bremen, OH 43107 | Oil & Gas Operator | Dec 1986 |
| 18717 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 18718 | Marjo Incorporat | | Oil & Gas Operator | Jun 1990 |
| 18719 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 18720 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Nov 2025 |
| 18721 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 18722 | Marjo, Inc. | | Oil & Gas Operator | Sep 1991 |
| 18723 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2025 |
| 18724 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 18725 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2025 |
| 18726 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 18727 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Nov 2025 |
| 18728 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 18729 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 18730 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 18731 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Dec 2025 |
| 18732 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 18733 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 18734 | Mark Producing Inc | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 18735 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 18736 | Mark Seifer | | Oil & Gas Operator | Dec 2024 |
| 18737 | Mark T. Kellner Oil Co. | Olean, NY 14760 | Oil & Gas Operator | Dec 2024 |
| 18738 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 18739 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 18740 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 18741 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 18742 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Feb 2026 |
| 18743 | Markham Enterprises Inc | | Oil & Gas Operator | May 1981 |
| 18744 | Markham, Charles A., Jr. & Janet E. | Gowanda, NY 14070 | Gas Operator | Dec 2024 |
| 18745 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 18746 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18747 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 18748 | Marks And Garner Production LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Sep 2010 |
| 18749 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 18750 | Marksmen Energy USA Inc | Worthington, OH 43085-1270 | Oil Operator | Dec 2023 |
| 18751 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Jan 2026 |
| 18752 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 18753 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 18754 | Marlan Anderson | | Oil Operator | Jan 2025 |
| 18755 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 18756 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 18757 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 18758 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 18759 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 18760 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | Feb 2026 |
| 18761 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 18762 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 18763 | Marlin Exploration, LLC | | Oil & Gas Operator | Nov 2025 |
| 18764 | Marlin Oil Company LLC | Gillette, WY 82718 | Oil & Gas Operator | Mar 2023 |
| 18765 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Nov 2025 |
| 18766 | Marlin Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 18767 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 18768 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 18769 | Marlin, Bruce W | | Oil Operator | Nov 2025 |
| 18770 | Marline Oil Corp | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 18771 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 18772 | Marlow Environmental LLC | Marlow, OK 73055 | Oil Operator | May 2022 |
| 18773 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 18774 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 18775 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 18776 | Marmac Resources Company | | Oil & Gas Operator | Mar 2015 |
| 18777 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 18778 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 18779 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 18780 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 18781 | Maroon Energy LLC | Spring, TX 77379 | Oil & Gas Operator | Feb 2025 |
| 18782 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 18783 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | Nov 2025 |
| 18784 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 18785 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 18786 | Marquis-Allred Eng Inc | | Oil & Gas Operator | Apr 1992 |
| 18787 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 18788 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 18789 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 18790 | Marrakesh Oil Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 1995 |
| 18791 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 18792 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 18793 | Marrs Richard L | | Gas Operator | Apr 1990 |
| 18794 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 18795 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 18796 | Marsh Lonnie C | Konawa, OK 74849 | Oil & Gas Operator | Nov 2025 |
| 18797 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2025 |
| 18798 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2023 |
| 18799 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Sep 2025 |
| 18800 | Marsh Tom F Inco | | Gas Operator | Jun 1987 |