| 2701 | M. L. Mayfield | | Oil & Gas Operator | Oct 1990 |
| 2702 | M. L. Mayfield Co. | | Oil & Gas Operator | Aug 1991 |
| 2703 | M. P. O'Meara Oil Co. | | Oil & Gas Operator | Apr 1991 |
| 2704 | M. P. S. Prod. Co. | Houston, TX 77225 | Oil & Gas Operator | Dec 1996 |
| 2705 | M. Parker Production Co. | | Oil Operator | Dec 2023 |
| 2706 | M. S. Delone | | Oil Operator | Nov 1990 |
| 2707 | M. T. R. Production | | Oil Operator | Mar 2006 |
| 2708 | M. W. Maxwell | | Oil & Gas Operator | Apr 1990 |
| 2709 | M2 Louisiana Gas Service, LLC | | Oil Operator | Apr 2010 |
| 2710 | Ma-Si, Inc. | | Oil & Gas Operator | May 1998 |
| 2711 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2024 |
| 2712 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Dec 2023 |
| 2713 | Maddox Energy Corporation | Dallas, TX BAD ADDR | Oil & Gas Operator | Jul 1995 |
| 2714 | Maddox Oil & Gas, Inc. | | Oil Operator | Apr 1983 |
| 2715 | Magic Circle Energy | Oklahoma City, OK 73185 | Oil & Gas Operator | Dec 1983 |
| 2716 | Magna Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 2717 | Magnolia Production Company LLC | | Oil & Gas Operator | Dec 2023 |
| 2718 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 2719 | Magnum Gas Pipeline, L.L.C. | | Oil Operator | Dec 2023 |
| 2720 | Magnum Hunter Resources Corporation | | Oil & Gas Operator | Nov 2019 |
| 2721 | Magnum Minerals, Inc. | | Oil & Gas Operator | May 1998 |
| 2722 | Magnum Producing & Operating Co. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jan 2004 |
| 2723 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2024 |
| 2724 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 2725 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 2726 | Mako Exploration Management, LLC | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 2727 | Mallard Drilling Corp. | | Oil & Gas Operator | Jan 1993 |
| 2728 | Mallard Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 2729 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 2730 | Malmac Energy Corp. | | Oil & Gas Operator | Jul 1987 |
| 2731 | Malone Oil & Gas Exploration, Inc. | | Oil Operator | Dec 2018 |
| 2732 | Malone-Killen Oil Expl. Co. | | Oil Operator | Apr 1992 |
| 2733 | Mammoth Service Group, LLC | | Oil & Gas Operator | Jan 2024 |
| 2734 | Mandalay Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2008 |
| 2735 | Mandalay Trading Services Inc. | | Oil Operator | Jul 1999 |
| 2736 | Mandina & Murphy Oil Company | | Oil Operator | Nov 1990 |
| 2737 | Mann Production Co., Inc. | | Oil Operator | Nov 1995 |
| 2738 | Manna Minerals, Inc. | | Oil & Gas Operator | Apr 1989 |
| 2739 | Mannon L. Walters, Inc. | | Oil & Gas Operator | Dec 2022 |
| 2740 | Manolo Energy, Inc. | | Oil Operator | Sep 1996 |
| 2741 | Manorado Oil Company | | Oil Operator | Feb 1999 |
| 2742 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 2743 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Apr 2024 |
| 2744 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Apr 2024 |
| 2745 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 2746 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 2747 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 2748 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 2749 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 2750 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 2751 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 2752 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 2753 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 2754 | Marathon Corporation | | Oil Operator | Dec 1994 |
| 2755 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 2756 | Marathon Oil Company/Fina | | Oil & Gas Operator | Jan 2005 |
| 2757 | Marben Corporation | | Oil Operator | Jul 1995 |
| 2758 | Marine Cont. & Supply Inc. | | Oil & Gas Operator | Nov 1985 |
| 2759 | Marine Properties, Inc. | | Oil & Gas Operator | Feb 1995 |
| 2760 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 2761 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 2762 | Maritech Resources, LLC | | Oil & Gas Operator | May 2011 |
| 2763 | Marjo, Inc. | | Oil & Gas Operator | Sep 1991 |
| 2764 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 2765 | Mark L Shidler, Inc. | Houston, TX 77055 | Oil & Gas Operator | Jan 2024 |
| 2766 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 2767 | Mark Seifer | | Oil & Gas Operator | Jan 2024 |
| 2768 | Mark V Petroleum Company | | Oil & Gas Operator | Apr 2020 |
| 2769 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 2770 | Marlan Anderson | | Oil Operator | Dec 2023 |
| 2771 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 2772 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 2773 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 2774 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 2775 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 2776 | Marlin Exploration, LLC | | Oil & Gas Operator | Jan 2024 |
| 2777 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2024 |
| 2778 | Marline Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 2779 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 2780 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 2781 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 2782 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Apr 2024 |
| 2783 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 2784 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 2785 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 2786 | Marshall & McCain | | Oil & Gas Operator | Oct 1988 |
| 2787 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jul 1992 |
| 2788 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 2789 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 2790 | Marshland Exploration Company | | Oil & Gas Operator | May 2006 |
| 2791 | Martin Energy LLC | | Oil & Gas Operator | Apr 2023 |
| 2792 | Martin Exploration Co. | | Oil & Gas Operator | Mar 1986 |
| 2793 | Martin Oil & Gas Co. | | Oil Operator | Jul 1981 |
| 2794 | Martin Oil Co. | Aspermont, TX 79502 | Oil & Gas Operator | Jul 2023 |
| 2795 | Martin Production Company | | Oil & Gas Operator | Dec 2023 |
| 2796 | Martin-Marks Operating Co. LLC | | Oil & Gas Operator | Dec 2010 |
| 2797 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 2798 | Marvin L. Muslow | | Oil Operator | Jun 1995 |
| 2799 | Mass Resources, Inc. | | Oil Operator | Nov 2023 |
| 2800 | Master Well Works, Inc. | | Oil Operator | Dec 2023 |