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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| 49 Oil Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Sep 2001 |
| A & G Oil & Gas | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2011 |
| A&S Mineral Development Company, LLC | Montana | 5,367 BBLs | 864 MCF | Mar 2021 - Feb 2024 |
| A. B. Energy LLC | Montana | 0 BBLs | 0 MCF | Oct 2011 - Jan 2024 |
| Abraxas Petroleum Corporation | Montana | 0 BBLs | 0 MCF | Mar 2008 - Sep 2021 |
| Agate Petroleum | Montana | 0 BBLs | 0 MCF | Apr 1996 - Jun 2000 |
| Aikins Drilling Company | Montana | 0 BBLs | 0 MCF | Feb 1991 - Dec 2019 |
| Ajax Oil Co | Montana | 0 BBLs | 0 MCF | Sep 1994 - Dec 2003 |
| Alme, Henry A. | Montana | 0 BBLs | 0 MCF | Aug 2009 - Jan 2024 |
| Alta VIsta Oil Corporation | Montana | 0 BBLs | 0 MCF | Aug 2017 - Jul 2021 |
| Altamont Oil & Gas Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - May 2012 |
| Alturas Energy LLC | Montana | 0 BBLs | 0 MCF | Aug 2010 - Aug 2015 |
| American Exploration Company | Montana | 0 BBLs | 0 MCF | Apr 1996 - Apr 1997 |
| American Midwest Oil & Gas Corp. | Montana | 0 BBLs | 0 MCF | Jan 2014 - Jun 2021 |
| Amoco Production Company | Montana | 0 BBLs | 0 MCF | Jul 1990 - Dec 1998 |
| Anadarko Minerals, Inc. | Montana | 0 BBLs | 0 MCF | Nov 2010 - Feb 2021 |
| Anderman Operating Co., Inc. | Montana | 0 BBLs | 0 MCF | Jun 1996 - Jul 1996 |
| Ang Holding (USA) Corp. | Montana | 0 BBLs | 0 MCF | Apr 2019 - Feb 2021 |
| Anr Production Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Apr 1997 |
| Ansbro Petroleum Company, LLC | Montana | 0 BBLs | 0 MCF | Jun 2007 - Dec 2007 |
| Anschutz Exploration Corporation | Montana | 0 BBLs | 0 MCF | Jan 2008 - Jul 2014 |
| Antelope Resources, Inc. | Montana | 0 BBLs | 0 MCF | Jul 2012 - May 2017 |
| Ap Petroleum Company LLC | Montana | 0 BBLs | 0 MCF | Jun 2007 - Mar 2009 |
| Apex Energy LLC | Montana | 252 BBLs | 0 MCF | Nov 2017 - Feb 2024 |
| Apex Energy, L.L.C. | Montana | 0 BBLs | 0 MCF | Mar 1994 - Oct 2004 |
| Armstrong Operating, Inc. | Montana | 0 BBLs | 0 MCF | Feb 1995 - Jan 2024 |
| Artex Oil Company | Montana | 0 BBLs | 0 MCF | Jan 2005 - Mar 2019 |
| Assiniboine & Sioux Tribes | Montana | 0 BBLs | 0 MCF | Apr 1996 - Mar 1997 |
| Athena Energy LLC | Montana | 0 BBLs | 0 MCF | Nov 2002 - Jan 2011 |
| Austin, Chas W | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2009 |
| Ayers, Milan R. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Oct 2000 |
| Aztec Energy Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2002 |
| Aztec Gas & Oil Corp. | Montana | 0 BBLs | 0 MCF | Jan 1997 - Mar 2005 |
| B & R Development, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1992 - Feb 2012 |
| B.C. Jam, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 1999 |
| Bain Resources, Inc. | Montana | 0 BBLs | 0 MCF | May 2021 - Jan 2024 |
| Balco Inc. | Montana | 0 BBLs | 0 MCF | Aug 1991 - Aug 2000 |
| Bald Eagle Resources, Inc. | Montana | 0 BBLs | 0 MCF | Sep 2000 - Jun 2006 |
| Baldwin Exploration Corporation | Montana | 0 BBLs | 0 MCF | Jun 2008 - Dec 2011 |
| Baldwin Lynch Energy Corp. | Montana | 1 BBLs | 0 MCF | Jan 2012 - Feb 2024 |
| Balko, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Ballantyne Ventures LLC | Montana | 0 BBLs | 0 MCF | Apr 2013 - Sep 2023 |
| Ballard Petroleum Holdings LLC | Montana | 0 BBLs | 0 MCF | Jan 1991 - May 2007 |
| Basic Earth Science Systems, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Apr 2010 |
| Bayswater Exploration & Production, LLC | Montana | 0 BBLs | 0 MCF | Aug 2006 - Jul 2021 |
| BBX Operating Co. LLC | Montana | 0 BBLs | 0 MCF | Apr 2000 - Feb 2024 |
| Beartooth Energy, LLC | Montana | 0 BBLs | 0 MCF | Nov 2010 - Feb 2024 |
| Beartooth Oil & Gas Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Behm Energy, Inc. | Montana | 4,476 BBLs | 0 MCF | May 1996 - Feb 2024 |
| Bensun Energy, LLC | Montana | 0 BBLs | 0 MCF | Oct 2010 - Aug 2020 |