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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Merrion Oil & Gas Corporation | Wyoming | 1,259 BBLs | 8,562 MCF | Jan 1978 - Jul 2026 |
| Mescalero Production | Wyoming | 0 BBLs | 0 MCF | Sep 1985 - Dec 1986 |
| Metfuel Wyoming Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1991 - Nov 1995 |
| Methane Productions Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1982 - Apr 2007 |
| Metro Mineral Corporation | Wyoming | 0 BBLs | 0 MCF | Nov 1988 - Dec 1995 |
| Meyer Douglas P | Wyoming | 0 BBLs | 0 MCF | Oct 1993 - Aug 2006 |
| Mi3 Energy LLC | Wyoming | 20,162 BBLs | 4,943 MCF | Nov 2025 - Aug 2026 |
| Mic Petroleum Inc | Wyoming | 0 BBLs | 0 MCF | Jul 1991 - Aug 1992 |
| Michigan-Wisconsin Pipe Line Co | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1982 |
| Michiwest Energy Inc | Wyoming | 0 BBLs | 0 MCF | Apr 1999 - Nov 2000 |
| Mid Central Production LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1998 - May 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,854 BBLs | 1,659 MCF | Feb 2017 - Aug 2026 |
| Midgard Energy Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Nov 1994 |
| Midway Oil Corporation | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 2007 |
| Millennium Oil & Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1999 - Oct 2025 |
| Mills Edgar | Wyoming | 0 BBLs | 0 MCF | Sep 1987 - Aug 1990 |
| Mineral Resources & Engineering | Wyoming | 0 BBLs | 0 MCF | Aug 1980 - Jul 1991 |
| Mingo Oil Producers | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Nov 1987 |
| Minnelusa Oil LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1991 - Feb 2002 |
| Minton Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1982 |
| Misahar Investments | Wyoming | 0 BBLs | 0 MCF | Oct 1989 - Dec 1992 |
| Mitchell Energy Corp | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Sep 1993 |
| Mitchell Enterprises | Wyoming | 0 BBLs | 0 MCF | Jul 1994 - Dec 1997 |
| Mitchell John F | Wyoming | 0 BBLs | 0 MCF | Feb 2000 - Mar 2006 |
| Mitchell M J | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jan 1983 |
| MJC Oil And Gas LLC | Wyoming | 0 BBLs | 0 MCF | Feb 2022 - Aug 2025 |
| MKM Services Inc | Wyoming | 22 BBLs | 0 MCF | Jan 2026 - Aug 2026 |
| Mobil Expl & Producing North America Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Nov 1986 |
| Moco Oil Inc | Wyoming | 0 BBLs | 0 MCF | Dec 1981 - May 1984 |
| Mole Operating | Wyoming | 0 BBLs | 0 MCF | Sep 1981 - Aug 1983 |
| Mon-Oil Inc | Wyoming | 0 BBLs | 0 MCF | Feb 1982 - Apr 1996 |
| Monahan Rex | Wyoming | 0 BBLs | 0 MCF | Nov 1978 - May 1999 |
| Moncrief W A Jr | Wyoming | 537 BBLs | 21,340 MCF | Jan 1978 - Aug 2026 |
| Monsanto Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 1986 |
| Montana Power Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jul 2000 |
| Montex Drilling Company LLC | Wyoming | 849 BBLs | 3,356 MCF | Feb 2025 - Aug 2026 |
| Montex Exploration | Wyoming | 0 BBLs | 0 MCF | Sep 1987 - Apr 2003 |
| Monument Global Resources Inc | Wyoming | 0 BBLs | 0 MCF | Jun 2015 - Jan 2025 |
| Moose Oil And Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2008 - Feb 2011 |
| More Production Company | Wyoming | 0 BBLs | 0 MCF | Jan 1993 - Dec 1999 |
| Morgan Energy Corporation | Wyoming | 0 BBLs | 0 MCF | Nov 1994 - Mar 2006 |
| Morgan Well Service Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1986 - Dec 1996 |
| Morning Star Oil Company | Wyoming | 0 BBLs | 0 MCF | Mar 1996 - Feb 2025 |
| Morningstar Energy Inc | Wyoming | 0 BBLs | 0 MCF | Oct 2007 - Mar 2013 |
| Morsey Oil & Gas Corporation | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1994 |
| Morton Holdings LLC | Wyoming | 0 BBLs | 0 MCF | May 2012 - Dec 2013 |
| Mosbacher Production Co | Wyoming | 0 BBLs | 0 MCF | Jan 1980 - Aug 1984 |
| Moss Properties Inc | Wyoming | 0 BBLs | 0 MCF | Aug 1979 - Mar 1986 |
| Mountain Hawk Energy LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2010 - Jan 2015 |
| Mountain Petroleum Corp | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jul 2008 |