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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mai Oil Operations, Inc. | Kansas | 40,445 BBLs | 455 MCF | Jan 1980 - Jan 2023 |
| Manzano LLC | New Mexico | 3,034 BBLs | 6,960 MCF | Mar 2005 - Mar 2023 |
| Mar-Lou Oil Co., LLC | Kansas | 3,321 BBLs | 0 MCF | Jan 1980 - Jan 2023 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 305,283 MCF | Jan 1999 - Mar 2023 |
| Marathon Oil Company | North Dakota | 2,592,013 BBLs | 5,230,135 MCF | Jul 1979 - Apr 2023 |
| Marathon Oil Permian LLC | New Mexico | 518,505 BBLs | 1,916,945 MCF | Jul 2017 - Mar 2023 |
| Marlin Exploration, LLC | Louisiana | 3,218 BBLs | 2,823 MCF | Mar 2015 - Apr 2023 |
| Marlin Operating, LLC | New Mexico | 2,092 BBLs | 3,683 MCF | Jan 2022 - Apr 2023 |
| Marlin Resources, L.L.C. | Louisiana | 2,508 BBLs | 0 MCF | Apr 2008 - Apr 2023 |
| Marquee Corporation | Louisiana | 3,938 BBLs | 763 MCF | Jun 1990 - Apr 2023 |
| Marshall & Winston Inc | New Mexico | 61,949 BBLs | 107,462 MCF | Jan 1993 - Mar 2023 |
| Matador Production Company | Louisiana | 203 BBLs | 48,004 MCF | Jan 2005 - Mar 2023 |
| Matador Production Company | New Mexico | 2,285,198 BBLs | 9,624,183 MCF | Mar 2006 - Mar 2023 |
| Maverick Permian LLC | New Mexico | 162,028 BBLs | 199,646 MCF | Jul 2022 - Mar 2023 |
| Maximus Operating LTD | Wyoming | 8,097 BBLs | 2,513 MCF | Jul 2014 - Apr 2023 |
| Maximus Operating, LTD. | Louisiana | 403 BBLs | 64,075 MCF | Jan 2006 - Apr 2023 |
| McCormick Production Company, Inc. | Louisiana | 4,692 BBLs | 0 MCF | Jan 2009 - Mar 2023 |
| McCoy Petroleum Corporation | Kansas | 16,778 BBLs | 28,890 MCF | Jan 1980 - Jan 2023 |
| McFadden Oil Co. | Kansas | 2,580 BBLs | 0 MCF | Jan 1980 - Jan 2023 |
| McGinness Energy Company, Inc. | Kansas | 1,477 BBLs | 3,046 MCF | Jan 2020 - Jan 2023 |
| McGowan Working Partners Inc. | Mississippi | 1,633 BBLs | 2,420 MCF | Dec 1976 - Mar 2023 |
| McGowan Working Partners, Inc | New Mexico | 4,249 BBLs | 10,661 MCF | May 2003 - Apr 2023 |
| McGowan Working Partners, Inc. | Arkansas | 6,339 BBLs | 3,103 MCF | Jan 2001 - Aug 2022 |
| McGowan Working Partners, Inc. | Louisiana | 25,185 BBLs | 45,646 MCF | Jan 2001 - Mar 2023 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,528 BBLs | 26,313 MCF | Jan 1993 - Apr 2023 |
| Medora Minerals, LLC | North Dakota | 6,793 BBLs | 97 MCF | Nov 2018 - Apr 2023 |
| Mercury Resources LLC | North Dakota | 6,519 BBLs | 13,325 MCF | Dec 2018 - Apr 2023 |
| Meridian Energy Inc. | Kansas | 1,607 BBLs | 0 MCF | Jan 1980 - Jan 2023 |
| Merit Energy Company | Wyoming | 450,152 BBLs | 231,106 MCF | Jan 1981 - Mar 2023 |
| Merit Energy Company, LLC | Arkansas | 0 BBLs | 6,098,520 MCF | Aug 2003 - Jun 2022 |
| Merit Energy Company, LLC | Kansas | 157,741 BBLs | 1,866,098 MCF | Jan 1980 - Jan 2023 |
| Merrion Oil & Gas Corp | New Mexico | 1,159 BBLs | 113,360 MCF | Jan 1993 - Mar 2023 |
| Messenger Petroleum, Inc. | Kansas | 2,321 BBLs | 53,379 MCF | Jan 1980 - Jan 2023 |
| Mewbourne Oil Co | New Mexico | 6,281,691 BBLs | 23,857,705 MCF | Jan 1993 - Mar 2023 |
| Michael D. Weilert Oil Company | Kansas | 1,454 BBLs | 0 MCF | Jan 1980 - Jan 2023 |
| Mid-Con Energy Operating LLC | Wyoming | 8,376 BBLs | 3,416 MCF | Feb 2017 - Apr 2023 |
| Mid-South Trading, Inc. | Louisiana | 2,786 BBLs | 0 MCF | Dec 1995 - Apr 2023 |
| Middle Fork Energy Uinta, LLC | Utah | 79,345 BBLs | 5,455,406 MCF | Sep 2018 - Mar 2023 |
| Midway Energy, LLC | Montana | 2,115 BBLs | 0 MCF | Mar 2019 - Mar 2023 |
| Midwestern Exploration Company | Kansas | 1,500 BBLs | 3,220 MCF | Jan 1980 - Jan 2023 |
| Mike Kelso Oil, Inc. | Kansas | 13,909 BBLs | 126,256 MCF | Jan 1980 - Jan 2023 |
| Miller Energy Company II LLC | Michigan | 19,892 BBLs | 3,212 MCF | Jan 1982 - May 2022 |
| Mission Creek Opco, LLC | Arkansas | 47,410 BBLs | 191,913 MCF | Oct 2018 - Jul 2022 |
| Missouri River Resources ND, LLC | North Dakota | 12,916 BBLs | 30,887 MCF | Nov 2014 - Apr 2023 |
| MMGK Arkoma, LLC | Arkansas | 0 BBLs | 1,002,726 MCF | Feb 2022 - Jun 2022 |
| Mna Enterprises LTD Co | New Mexico | 2,280 BBLs | 0 MCF | May 1994 - Mar 2023 |
| Mobil Oil Exploration & Producing Southeast, Inc. | Alabama | 53 BBLs | 884,543 MCF | Aug 1976 - Feb 2023 |
| Mogo Reagan, LLC | Montana | 3,040 BBLs | 6,455 MCF | Nov 2019 - Mar 2023 |
| Moncrief W A Jr | Wyoming | 1,224 BBLs | 99,133 MCF | Jan 1978 - Apr 2023 |
| Montalban Oil & Gas Operations, Inc. | Montana | 3,013 BBLs | 49,156 MCF | Jan 1991 - Mar 2023 |