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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mammoth Exploration LLC | North Dakota | 0 BBLs | 0 MCF | Jan 2005 - Jan 2008 |
| Mancal Resources Corporation | North Dakota | 0 BBLs | 0 MCF | Nov 2002 - Aug 2019 |
| Mann Enterprises, LLC | North Dakota | 0 BBLs | 0 MCF | Nov 2011 - May 2012 |
| Mann Oil Company, LLC | North Dakota | 0 BBLs | 0 MCF | Dec 2011 - Jun 2023 |
| Mar-Win Development Co. | North Dakota | 0 BBLs | 0 MCF | Apr 1959 - Nov 1988 |
| Marathon Oil Company | North Dakota | 1,670,729 BBLs | 4,380,206 MCF | Jul 1979 - Jul 2026 |
| Marlo Operating Company, LLC | North Dakota | 947 BBLs | 55 MCF | Mar 2026 - Jul 2026 |
| Marsha Azar | North Dakota | 0 BBLs | 0 MCF | Jul 2002 - Jan 2017 |
| Marshall & Winston, Inc. | North Dakota | 0 BBLs | 0 MCF | May 1979 - Sep 2005 |
| Marza Oil LLC | North Dakota | 0 BBLs | 0 MCF | Jul 2026 - Jul 2026 |
| Mayson, Inc. | North Dakota | 0 BBLs | 0 MCF | Jul 2002 - Jun 2003 |
| Mbi Oil & Gas, LLC | North Dakota | 487 BBLs | 0 MCF | Nov 2008 - Jul 2026 |
| McAlester Fuel Co. | North Dakota | 0 BBLs | 0 MCF | Apr 1959 - Oct 1960 |
| McOr Oil & Gas Corp. | North Dakota | 0 BBLs | 0 MCF | Oct 2003 - Oct 2013 |
| McRae & Henry, LTD. | North Dakota | 0 BBLs | 0 MCF | Jul 2002 - May 2022 |
| Medicine Bow Operating Company | North Dakota | 0 BBLs | 0 MCF | Feb 2004 - Jul 2004 |
| Medora Minerals, LLC | North Dakota | 6,384 BBLs | 76 MCF | Nov 2018 - Jul 2026 |
| Mercury Resources LLC | North Dakota | 11,235 BBLs | 27,305 MCF | Dec 2018 - Jul 2026 |
| Meridian Oil, Inc. | North Dakota | 0 BBLs | 0 MCF | Jan 1986 - Jul 1992 |
| Merit Energy Company | North Dakota | 0 BBLs | 0 MCF | Apr 1992 - Jan 2014 |
| Mesa Petroleum Co. | North Dakota | 0 BBLs | 0 MCF | Apr 1980 - Aug 1985 |
| Mid-Con Energy Operating, LLC | North Dakota | 0 BBLs | 0 MCF | Jul 2014 - Jun 2016 |
| Midcon Energy Operating, Inc | North Dakota | 0 BBLs | 0 MCF | Nov 2012 - Jun 2014 |
| Milestone Petroleum, Inc. | North Dakota | 0 BBLs | 0 MCF | Aug 1983 - Jun 1985 |
| Mission Ridge Enterprise | North Dakota | 0 BBLs | 0 MCF | Nov 1984 - Jun 1985 |
| Missouri Basin Well Service, Inc. | North Dakota | 0 BBLs | 0 MCF | Aug 2001 - Jan 2018 |
| Missouri Breaks, LLC | North Dakota | 0 BBLs | 0 MCF | Apr 2005 - Jun 2011 |
| Missouri River Resources ND, LLC | North Dakota | 5,259 BBLs | 28,971 MCF | Nov 2014 - Jul 2026 |
| Missouri River Royalty Corporation | North Dakota | 823 BBLs | 20 MCF | Jun 1997 - Jul 2026 |
| Mitchell Energy Corp. | North Dakota | 0 BBLs | 0 MCF | Jun 1982 - Jul 1987 |
| Mobil Oil Corp. | North Dakota | 0 BBLs | 0 MCF | Oct 1982 - Aug 1983 |
| Moore & Associates | North Dakota | 0 BBLs | 0 MCF | Aug 1976 - Sep 1976 |
| Morningstar Operating LLC | North Dakota | 36,300 BBLs | 37,298 MCF | Oct 2024 - Jul 2026 |
| Mountain Divide, LLC | North Dakota | 0 BBLs | 0 MCF | Jan 2013 - Mar 2017 |
| Murex Petroleum Corporation | North Dakota | 157,385 BBLs | 441,196 MCF | Apr 2001 - Jul 2026 |
| Murfin Drilling Company, Inc. | North Dakota | 26,313 BBLs | 15,501 MCF | Feb 2025 - Jul 2026 |
| Nadel And Gussman Rockies, LLC | North Dakota | 0 BBLs | 0 MCF | Apr 2007 - Jan 2012 |
| Nance Petroleum Corporation | North Dakota | 0 BBLs | 0 MCF | Apr 1984 - Oct 2007 |
| National Associated Petroleum Co. | North Dakota | 0 BBLs | 0 MCF | Jun 1953 - Aug 1953 |
| NCND Minot Project '75 | North Dakota | 0 BBLs | 0 MCF | Apr 1981 - Jun 1983 |
| Nearburg Producing Company | North Dakota | 0 BBLs | 0 MCF | Jun 2004 - Oct 2014 |
| Neptune Operating LLC | North Dakota | 509,427 BBLs | 1,447,253 MCF | Jan 2023 - Jul 2026 |
| Nerdlihc Company, Inc. | North Dakota | 0 BBLs | 0 MCF | Feb 1993 - Jan 1994 |
| New Horizon Exploration, Inc. | North Dakota | 0 BBLs | 0 MCF | Nov 1991 - Jan 1993 |
| New Horizon Resources LLC | North Dakota | 82 BBLs | 0 MCF | Dec 2017 - Jul 2026 |
| New Millennium Resources, Inc. | North Dakota | 669 BBLs | 54 MCF | Apr 2002 - Jul 2026 |
| Newfield Production Company | North Dakota | 0 BBLs | 0 MCF | May 2006 - Oct 2021 |
| Nexen Oil And Gas U.S.A. Inc. | North Dakota | 0 BBLs | 0 MCF | Oct 2001 - Feb 2010 |
| Nine Point Energy, LLC | North Dakota | 0 BBLs | 0 MCF | May 2017 - Oct 2021 |
| Noah Energy Inc. | North Dakota | 0 BBLs | 0 MCF | Sep 2016 - Jun 2024 |