| 801 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 802 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 803 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 804 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |
| 805 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 806 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 807 | May Oil & Gas | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 808 | May Oil & Gas, L.L.C. | | Oil & Gas Operator | Dec 2013 |
| 809 | May Petroleum Inc | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 810 | Maya Oil LLC | | Oil Operator | Dec 2025 |
| 811 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Oct 2025 |
| 812 | Maybrier Brothers | | Oil Operator | Apr 2006 |
| 813 | Maybrier Production, L.L.C. | | Oil Operator | Oct 2022 |
| 814 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 815 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 816 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 817 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Feb 2026 |
| 818 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Feb 2026 |
| 819 | Mayfield SWD LLC | McKinney, TX 75070-5020 | Oil Operator | Aug 2021 |
| 820 | Mayhar N D | Eufaula, OK 74432 | Oil Operator | Apr 2015 |
| 821 | Mayhew Properties | | Gas Operator | Sep 2025 |
| 822 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 823 | Mayle, James | Philippi, WV 26416 | Gas Operator | Dec 2008 |
| 824 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 825 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 826 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 827 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 828 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Feb 2026 |
| 829 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2026 |
| 830 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 831 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 832 | Mays Coal Co | Clarion, PA 16214-0447 | Gas Operator | Dec 2003 |
| 833 | Mays Enterprises, Inc. | Mineral Wells, TX 76067 | Gas Operator | Oct 2010 |
| 834 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2025 |
| 835 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 836 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 837 | Mayshark, James Page | Sherman, NY 14781 | Gas Operator | Dec 2024 |
| 838 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Feb 2026 |
| 839 | Mazel Oil & Gas Co. | Austin, TX 78768 | Gas Operator | Jan 1994 |
| 840 | Mazurkiewicz, Gary, Kimberly, Matt | Perrysburg, NY 14129 | Gas Operator | Dec 2024 |
| 841 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Feb 2026 |
| 842 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 843 | MB Holdings LLC | Independence, KS 67301 | Oil Operator | Sep 2025 |
| 844 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 845 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 846 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Dec 2025 |
| 847 | MBM Partnership | | Gas Operator | Nov 1991 |
| 848 | MBM Production, LLC | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2023 |
| 849 | Mbo, LLC | | Oil Operator | Jan 2025 |
| 850 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 851 | MBS Resources Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2025 |
| 852 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Feb 2026 |
| 853 | MC C Oil Co Inc | Sedan, KS 67361 | Oil Operator | Apr 2016 |
| 854 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Aug 2025 |
| 855 | MC Oil, LLC | Morganfield, KY 42437 | Oil Operator | Dec 2023 |
| 856 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 857 | MC123 LLC | Indiana, PA 15701-8718 | Gas Operator | Dec 2025 |
| 858 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Feb 2026 |
| 859 | McAam Oil Company, Inc. | Wichita, KS 67206 | Gas Operator | Dec 2001 |
| 860 | McAdams Roux & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1999 |
| 861 | McAdams, J F | | Oil Operator | May 1971 |
| 862 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 863 | McAlmond Oil Company | Fort Worth, TX 76136 | Oil & Gas Operator | Apr 2022 |
| 864 | McAnear Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Dec 2002 |
| 865 | McAninch J W | Tonkawa, OK 74653 | Oil & Gas Operator | Nov 2000 |
| 866 | McAninch Michael E | Tonkawa, OK 74653-4415 | Oil & Gas Operator | May 2013 |
| 867 | McAninch W Kent | Tonkawa, OK 74653-4216 | Oil & Gas Operator | Oct 2016 |
| 868 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 869 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 870 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Feb 2026 |
| 871 | McBee, Jim Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2012 |
| 872 | McBo Oil Co. | | Oil & Gas Operator | Dec 1996 |
| 873 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |
| 874 | McBride Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 875 | McBride Production Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1993 |
| 876 | McBride, Jane | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 877 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 878 | McBride, Nicholas J. & Holly M. | Lakeland, FL 33810 | Gas Operator | Dec 2024 |
| 879 | McCabe & Co | Albion, PA 16401-8013 | Oil & Gas Operator | Dec 1994 |
| 880 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 881 | McCabe Oil And Gas LLC / Osage Only | | Oil Operator | Nov 2025 |
| 882 | McCabe, William G | | Oil & Gas Operator | Aug 2013 |
| 883 | McCaffery & Krampf Oil Co. | Allegany, NY 14706 | Oil Operator | Dec 2012 |
| 884 | McCall Carl E | Fairmount City, PA 16224 | Oil & Gas Operator | Dec 2025 |
| 885 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Feb 2026 |
| 886 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Feb 2026 |
| 887 | McCandless Rober | | Oil & Gas Operator | May 1991 |
| 888 | McCandlish R L Oil Co Inc | Bremen, OH 43107 | Oil & Gas Operator | Dec 1997 |
| 889 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 890 | McCann Drilling | | Oil & Gas Operator | Oct 1996 |
| 891 | McCann Drilling, Inc. | Bartlesville, OK 74003 | Oil Operator | Mar 2011 |
| 892 | McCann Mark Wind | | Oil & Gas Operator | Dec 1994 |
| 893 | McCann Petroleum, Inc. | Sedan, KS 67361 | Oil & Gas Operator | Jul 1998 |
| 894 | McCann Resources Inc | | Oil & Gas Operator | Nov 2025 |
| 895 | McCarley, Emit/Ray, John Murray | | Gas Operator | Aug 2009 |
| 896 | McCart Sue | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2024 |
| 897 | McCarter | | Gas Operator | Nov 1996 |
| 898 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 899 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 900 | McCarter-Greenbrier-Macdonald | | Oil Operator | Sep 1981 |