| 18001 | Magnusson Karl E | | Oil Operator | Apr 1987 |
| 18002 | Magpie Operating, Inc | | Oil & Gas Operator | Sep 2025 |
| 18003 | Magruder '81, LTD. | Midland, TX 79701 | Oil & Gas Operator | Jan 1995 |
| 18004 | Magruder, Edwin H., Jr. | Midland, TX 79701 | Oil & Gas Operator | Oct 2019 |
| 18005 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 18006 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 18007 | Maha Energy Us Inc | | Oil Operator | Nov 2023 |
| 18008 | Mahan, Janet L | | Oil & Gas Operator | Aug 2025 |
| 18009 | Mahfouz Energy Company | Houston, TX 77255 | Oil & Gas Operator | Nov 2020 |
| 18010 | Mahl, Matthew J. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 18011 | Mahler & Scott | Ruidoso, NM 88355 | Oil & Gas Operator | Aug 2003 |
| 18012 | Mahler, Kelly Operating | Graham, TX 76450 | Oil & Gas Operator | Mar 2017 |
| 18013 | Mahue Construction Company | Huntington, WV 25724-2345 | Oil & Gas Operator | Dec 2021 |
| 18014 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 18015 | Mai Operations | | Oil Operator | Dec 1996 |
| 18016 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 18017 | Maier, H Paul | | Oil Operator | Dec 2023 |
| 18018 | Main Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2009 |
| 18019 | Main Street Royalty, Inc. | Lockhart, TX 78644 | Oil & Gas Operator | Aug 1999 |
| 18020 | Maines, Wendy R. | Irving, NY 14081 | Gas Operator | Dec 2024 |
| 18021 | Mainspring LLC | Uhrichsville, OH 44683 | Oil & Gas Operator | Dec 2024 |
| 18022 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | Aug 2025 |
| 18023 | Majestic Energy Company LLC | Keifer, OK 74041 | Oil Operator | Sep 2025 |
| 18024 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 18025 | Majestic Management Corp | | Oil Operator | Dec 2013 |
| 18026 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Dec 2025 |
| 18027 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 18028 | Majestic Petroleum Corporation | Dallas, TX 75230 | Oil & Gas Operator | Oct 1996 |
| 18029 | Majestic Petroleum Operations Inc | Story, WY 82842 | Gas Operator | Mar 2007 |
| 18030 | Majestic Resources, Inc. | Dripping SPGS, TX 78620 | Oil & Gas Operator | Nov 2007 |
| 18031 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 18032 | Major Oil Co LLC | Drumright, OK 74030 | Oil & Gas Operator | May 2025 |
| 18033 | Major Oil Compan | | Oil Operator | Mar 1988 |
| 18034 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Sep 2025 |
| 18035 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Aug 2025 |
| 18036 | Majors Jimmy R | Osceola, NE 68651-0726 | Oil & Gas Operator | Sep 2000 |
| 18037 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Sep 2025 |
| 18038 | Majors Michael | Holdenville, OK 74848-0531 | Oil & Gas Operator | Sep 1994 |
| 18039 | Majors, Linda K | | Oil Operator | Aug 2025 |
| 18040 | Mak Oil & Gas Co | | Oil Operator | Mar 2009 |
| 18041 | Mak-J Energy Partners(TX),LTD. | Denver, CO 80206 | Oil & Gas Operator | Sep 2013 |
| 18042 | Mak-J Energy Wyoming LLC | Denver, CO 80620 | Oil & Gas Operator | Nov 2012 |
| 18043 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 18044 | Makk Oil Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 18045 | Mako Exploration Management, LLC | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2025 |
| 18046 | Mako Operating Company, LLC | Andover, KS 67002 | Gas Operator | May 2002 |
| 18047 | Makoil, Inc. | Lake Forest, CA 92630 | Oil & Gas Operator | Jul 2007 |
| 18048 | Maledon Enterprises | Austin, TX 78738 | Oil & Gas Operator | Feb 1996 |
| 18049 | Malka Production Company | Oklahoma City, OK 73101-0248 | Oil & Gas Operator | Jan 2000 |
| 18050 | Mallard Drilling Corp. | | Oil & Gas Operator | Jan 1993 |
| 18051 | Mallard DRLG & Central Oil Co | | Gas Operator | Mar 1978 |
| 18052 | Mallard Exploration, Inc. | | Oil & Gas Operator | Sep 1975 |
| 18053 | Mallard Oil & Gas | Cody, WY 82414-9640 | Oil & Gas Operator | Oct 2019 |
| 18054 | Mallard Operating LLC | | Oil & Gas Operator | Nov 2024 |
| 18055 | Mallard Petroleum, Inc. | | Oil & Gas Operator | Apr 1986 |
| 18056 | Mallett Luke-Dba Mallett Energy | New Concord, OH 43762 | Oil & Gas Operator | Dec 2016 |
| 18057 | Mallon Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 18058 | Mallonee-Mahoney | | Oil & Gas Operator | Dec 1994 |
| 18059 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Sep 2025 |
| 18060 | Mallory, Meredith, Jr. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2002 |
| 18061 | Malmac Energy Corp. | | Oil & Gas Operator | Jul 1987 |
| 18062 | Malone Donald J | | Oil Operator | Nov 1993 |
| 18063 | Malone Oil & Gas Exploration, Inc. | | Oil Operator | Dec 2018 |
| 18064 | Malone Oil Co. | | Oil & Gas Operator | Jul 2006 |
| 18065 | Malone Oil Compa | | Oil Operator | Dec 1994 |
| 18066 | Malone Oil Production | La Vernia, TX 78121 | Oil & Gas Operator | Dec 2025 |
| 18067 | Malone-Killen Oil Expl. Co. | | Oil Operator | Apr 1992 |
| 18068 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Sep 2025 |
| 18069 | Malpais Inc | Prague, OK 74864 | Gas Operator | Sep 2025 |
| 18070 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 18071 | Malvern Group Inc | Clearwater, FL 33758-6817 | Oil & Gas Operator | Mar 2005 |
| 18072 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Sep 2025 |
| 18073 | Mamerow Energy Corp | Ganado, TX 77962 | Oil & Gas Operator | Dec 2025 |
| 18074 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 18075 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Dec 2025 |
| 18076 | Mammoth Resource, LLC | | Oil & Gas Operator | Dec 2008 |
| 18077 | Mammoth Service Group, LLC | | Oil & Gas Operator | Aug 2025 |
| 18078 | Manana Gas Inc | Albuquerque, NM 87122 | Oil & Gas Operator | Sep 2025 |
| 18079 | Mancal Resources Corporation | | Oil & Gas Operator | Aug 2019 |
| 18080 | Mance, Patricia M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 18081 | Manchester Oil Co | | Oil Operator | Jan 2000 |
| 18082 | Mancuso, Richard L. | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 18083 | Mandalay Oil & Gas, L.L.C. | | Oil & Gas Operator | May 2008 |
| 18084 | Mandalay Trading Services Inc. | | Oil Operator | Jul 1999 |
| 18085 | Mandarin Oil & Gas Company | Austin, TX 78714 | Oil & Gas Operator | Dec 2025 |
| 18086 | Mandina & Murphy Oil Company | | Oil Operator | Nov 1990 |
| 18087 | Mandujano, Alfonso & Olga | Von Ormy, TX 78073 | Oil & Gas Operator | Dec 2014 |
| 18088 | Mandujano, Alfonso, Jr. | Von Ormy, TX 78073 | Oil Operator | Dec 2025 |
| 18089 | Manewal Bradley Oil Company | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2013 |
| 18090 | Maney McNeal Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 18091 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 18092 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | Sep 2025 |
| 18093 | Manitou Explor Co Inc | Granville, OH 43023 | Oil & Gas Operator | Dec 1997 |
| 18094 | Manley Energy Resources LLC | | Oil Operator | Jan 2018 |
| 18095 | Manley, John D. III, Oper., Inc | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2016 |
| 18096 | Mann Energy, Inc. | Charleston, WV 25332-3242 | Oil & Gas Operator | Nov 2018 |
| 18097 | Mann Oil Company, LLC | | Oil Operator | Jun 2023 |
| 18098 | Mann Production Co., Inc. | | Oil Operator | Nov 1995 |
| 18099 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 18100 | Manna Minerals, Inc. | | Oil & Gas Operator | Apr 1989 |