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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Maxim Drilling & Expl Inc | Wyoming | 1,054 BBLs | 12,921 MCF | Jun 1982 - Oct 2024 |
| Maximus Operating LTD | Wyoming | 10,739 BBLs | 2,362 MCF | Jul 2014 - Oct 2024 |
| Mbi Oil & Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jul 2014 - Nov 2014 |
| McAdams Roux & Associates | Wyoming | 0 BBLs | 0 MCF | Aug 1984 - Dec 1999 |
| McCartney Engineering LLC | Wyoming | 447 BBLs | 1,380 MCF | Apr 2001 - Oct 2024 |
| McClure Enterprises | Wyoming | 1 BBLs | 0 MCF | Oct 1990 - Oct 2024 |
| McCulliss Resource Company Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1983 - Jun 1999 |
| McCutchin Alma | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Nov 1978 |
| McEna Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1991 |
| McGuire John C | Wyoming | 0 BBLs | 0 MCF | Jan 1987 - Oct 2005 |
| McKenzie Production Co | Wyoming | 0 BBLs | 0 MCF | May 1990 - Jul 1994 |
| MCL 1 Oil & Gas Wyoming LLC | Wyoming | 0 BBLs | 0 MCF | Nov 2015 - Jul 2018 |
| MCM Operating LLC | Wyoming | 709 BBLs | 668 MCF | Nov 2019 - Nov 2024 |
| McMahon-Bullington LP | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Apr 2009 |
| McMurry Energy Company | Wyoming | 0 BBLs | 0 MCF | Jun 2000 - Dec 2001 |
| McMurry Oil LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 2004 |
| McO Resources Corporation | Wyoming | 0 BBLs | 0 MCF | Mar 1985 - Feb 1986 |
| McQueen Ed & Company Inc | Wyoming | 0 BBLs | 0 MCF | Jul 1990 - Dec 1995 |
| McRae & Henry LTD | Wyoming | 0 BBLs | 0 MCF | Nov 1989 - Dec 2020 |
| MCS Oil | Wyoming | 0 BBLs | 0 MCF | Sep 2013 - Aug 2019 |
| Meadow Deep LLC | Wyoming | 139 BBLs | 12,978 MCF | Mar 2010 - Oct 2024 |
| 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 | 608 BBLs | 0 MCF | Mar 2014 - Oct 2024 |
| Mega Energy LLC | Wyoming | 0 BBLs | 0 MCF | May 2013 - Oct 2024 |
| 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 | 416,390 BBLs | 226,305 MCF | Jan 1981 - Oct 2024 |
| 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 | 1,434 BBLs | 55,585 MCF | Jan 1978 - Sep 2024 |
| 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 |
| 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 - Jun 2024 |
| Mid-Con Energy Operating LLC | Wyoming | 7,462 BBLs | 2,945 MCF | Feb 2017 - Oct 2024 |
| 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 - Aug 2024 |