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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Meadow Deep LLC | Wyoming | 264 BBLs | 10,659 MCF | Mar 2010 - Apr 2026 |
| Medallion Exploration | Wyoming | 0 BBLs | 0 MCF | Nov 1996 - Nov 2015 |
| Medallion Petroleum Inc | Wyoming | 0 BBLs | 0 MCF | Oct 1997 - Sep 2006 |
| Medallion Production Company | Wyoming | 0 BBLs | 0 MCF | Jan 1989 - May 1997 |
| Medicine Bow Operating Company | Wyoming | 0 BBLs | 0 MCF | Jan 1984 - Jun 2006 |
| Meerkat Logistics And Operations LLC | Wyoming | 58 BBLs | 0 MCF | Mar 2014 - Apr 2026 |
| Mega Energy LLC | Wyoming | 0 BBLs | 18,115 MCF | May 2013 - Apr 2026 |
| Mels Water Service Inc | Wyoming | 0 BBLs | 0 MCF | Nov 1990 - Mar 2013 |
| Memorial Exploration Company | Wyoming | 0 BBLs | 0 MCF | Feb 1991 - Jun 1994 |
| Memorial Production Operating LLC | Wyoming | 0 BBLs | 0 MCF | Dec 2012 - May 2017 |
| Merit Energy Company | Wyoming | 390,468 BBLs | 208,316 MCF | Jan 1981 - Apr 2026 |
| Merit Productions | Wyoming | 0 BBLs | 0 MCF | Nov 1983 - Sep 1996 |
| Meritage Energy Company LLC | Wyoming | 0 BBLs | 0 MCF | Jun 2007 - Oct 2010 |
| Meritage Energy Partners LLC | Wyoming | 0 BBLs | 0 MCF | May 2002 - Dec 2005 |
| Merrico Resources | Wyoming | 0 BBLs | 0 MCF | Jan 1990 - Mar 1992 |
| Merrimac Oil & Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2006 - Dec 2008 |
| Merrion Oil & Gas Corporation | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Feb 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 | 18,905 BBLs | 4,363 MCF | Nov 2025 - May 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 - Dec 2025 |
| Mid-Con Energy Operating LLC | Wyoming | 6,282 BBLs | 1,000 MCF | Feb 2017 - Apr 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 | 36 BBLs | 0 MCF | Jan 2026 - May 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 | 775 BBLs | 19,522 MCF | Jan 1978 - Apr 2026 |
| Monsanto Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 1986 |