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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mack Energy Corp | New Mexico | 137,000 BBLs | 293,560 MCF | Jan 1993 - Sep 2023 |
| Magna Operating, LLC | Louisiana | 7,456 BBLs | 0 MCF | Sep 2010 - Mar 2023 |
| Magnolia Production Company LLC | Louisiana | 2,135 BBLs | 42,797 MCF | Mar 2015 - Mar 2023 |
| Magnum Producing, L.P. | Louisiana | 4,718 BBLs | 0 MCF | Jan 2004 - Mar 2023 |
| Magpie Operating, Inc | Colorado | 22,598 BBLs | 108,022 MCF | Jan 1999 - Sep 2023 |
| Mai Oil Operations, Inc. | Kansas | 45,445 BBLs | 448 MCF | Jan 1980 - Jul 2023 |
| Manzano LLC | New Mexico | 2,801 BBLs | 4,384 MCF | Mar 2005 - Sep 2023 |
| Mar-Lou Oil Co., LLC | Kansas | 2,389 BBLs | 0 MCF | Jan 1980 - Jul 2023 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 245,923 MCF | Jan 1999 - Sep 2023 |
| Marathon Oil Company | North Dakota | 2,845,132 BBLs | 5,832,552 MCF | Jul 1979 - Sep 2023 |
| Marathon Oil Permian LLC | New Mexico | 541,838 BBLs | 1,885,152 MCF | Jul 2017 - Sep 2023 |
| Marlin Exploration, LLC | Louisiana | 3,218 BBLs | 2,823 MCF | Mar 2015 - 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 | 35,663 BBLs | 80,102 MCF | Jan 1993 - Sep 2023 |
| Matador Production Company | Louisiana | 203 BBLs | 48,004 MCF | Jan 2005 - Mar 2023 |
| Matador Production Company | New Mexico | 2,914,953 BBLs | 11,905,174 MCF | Mar 2006 - Sep 2023 |
| Matrix Production Company | Wyoming | 24,347 BBLs | 23,385 MCF | Jan 1994 - Sep 2023 |
| Maverick Permian LLC | New Mexico | 88,244 BBLs | 926,039 MCF | Jul 2022 - Sep 2023 |
| Maximus Operating LTD | Wyoming | 9,793 BBLs | 1,922 MCF | Jul 2014 - Oct 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 | 16,838 BBLs | 25,289 MCF | Jan 1980 - Jul 2023 |
| McFadden Oil Co. | Kansas | 3,172 BBLs | 0 MCF | Jan 1980 - Jul 2023 |
| McGowan Working Partners Inc. | Mississippi | 2,298 BBLs | 3,146 MCF | Dec 1976 - Oct 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 | 3,593 BBLs | 24,430 MCF | Jan 1993 - Oct 2023 |
| Medora Minerals, LLC | North Dakota | 5,522 BBLs | 95 MCF | Nov 2018 - Oct 2023 |
| Mercury Resources LLC | North Dakota | 6,911 BBLs | 14,432 MCF | Dec 2018 - Sep 2023 |
| Meridian Energy Inc. | Kansas | 2,950 BBLs | 0 MCF | Jan 1980 - Jul 2023 |
| Merit Energy Company | Wyoming | 432,384 BBLs | 229,616 MCF | Jan 1981 - Sep 2023 |
| Merit Energy Company, LLC | Arkansas | 0 BBLs | 6,098,520 MCF | Aug 2003 - Jun 2022 |
| Merit Energy Company, LLC | Kansas | 164,549 BBLs | 1,854,350 MCF | Jan 1980 - Jul 2023 |
| Merrion Oil & Gas Corp | New Mexico | 1,020 BBLs | 109,539 MCF | Jan 1993 - Oct 2023 |
| Merrion Oil & Gas Corporation | Wyoming | 1,412 BBLs | 51,623 MCF | Jan 1978 - Oct 2023 |
| Messenger Petroleum, Inc. | Kansas | 2,518 BBLs | 33,159 MCF | Jan 1980 - Jul 2023 |
| Messer LLC | Colorado | 0 BBLs | 69,412 MCF | Jul 2022 - Sep 2023 |
| Mewbourne Oil Co | New Mexico | 5,633,514 BBLs | 22,011,219 MCF | Jan 1993 - Sep 2023 |
| Michael D. Weilert Oil Company | Kansas | 1,703 BBLs | 0 MCF | Jan 1980 - Jul 2023 |
| Mid-Con Energy Operating LLC | Wyoming | 7,543 BBLs | 2,657 MCF | Feb 2017 - Oct 2023 |
| Mid-Continent Resources, Inc. | Kansas | 1,773 BBLs | 0 MCF | Jan 1980 - Jul 2023 |
| Mid-South Trading, Inc. | Louisiana | 2,786 BBLs | 0 MCF | Dec 1995 - Apr 2023 |
| Midway Energy, LLC | Montana | 2,449 BBLs | 0 MCF | Mar 2019 - Sep 2023 |
| Mike Kelso Oil, Inc. | Kansas | 16,704 BBLs | 145,769 MCF | Jan 1980 - Jul 2023 |
| Miller Energy Company II LLC | Michigan | 18,873 BBLs | 3,349 MCF | Jan 1982 - Nov 2022 |
| Mineral Ventures, Inc. | Louisiana | 367 BBLs | 37,648 MCF | Mar 1998 - Mar 2023 |
| Missaukee Oil And Gas Company LLC | Michigan | 5,166 BBLs | 0 MCF | Sep 2019 - Dec 2022 |
| Mission Creek Opco, LLC | Arkansas | 47,410 BBLs | 191,913 MCF | Oct 2018 - Jul 2022 |
| Missouri River Resources ND, LLC | North Dakota | 7,857 BBLs | 24,718 MCF | Nov 2014 - Sep 2023 |