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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| NRC Development, LLC | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 2002 |
| NRG Co., The | Montana | 0 BBLs | 0 MCF | Jan 1996 - Jan 1997 |
| Oakley & Hays | Montana | 0 BBLs | 0 MCF | Jan 1991 - Apr 2000 |
| Oasis Petroleum North America LLC | Montana | 48,656 BBLs | 54,943 MCF | Mar 2007 - Feb 2024 |
| Ocean Energy Resources, Inc. | Montana | 0 BBLs | 0 MCF | Oct 1997 - Oct 2001 |
| Ocean Energy, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2003 |
| Oil Quest Resources, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2011 |
| Okie Crude Company | Montana | 0 BBLs | 0 MCF | Jul 2014 - Oct 2023 |
| Olympic Exploration & Production Co | Montana | 0 BBLs | 0 MCF | Mar 1999 - May 2003 |
| Omimex Canada, LTD. | Montana | 0 BBLs | 0 MCF | Jul 2003 - Jan 2024 |
| Omimex Petroleum, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Oct 2010 |
| Onshore Holdings LLC | Montana | 0 BBLs | 0 MCF | Nov 2013 - Mar 2016 |
| Opal Oil Corporation | Montana | 0 BBLs | 0 MCF | Feb 2002 - Apr 2008 |
| Orion Energy Partners LP | Montana | 0 BBLs | 0 MCF | Jun 2006 - Aug 2009 |
| Outlook Petroleum Corp. | Montana | 0 BBLs | 0 MCF | Mar 1991 - Jan 2001 |
| Pac Enterprises | Montana | 0 BBLs | 0 MCF | Apr 1996 - Nov 2002 |
| Pacer Resources, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1993 - Dec 2001 |
| Painted Pegasus Petroleum LLC Dba P3 Petroleum LLC | Montana | 0 BBLs | 0 MCF | Sep 2016 - Dec 2021 |
| Pamect Oil, Keith E. Tyner Dba | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2020 |
| Panther Creek Resources, LLC | Montana | 0 BBLs | 0 MCF | Oct 1997 - May 2012 |
| Panther Energy Company, LLC | Montana | 0 BBLs | 0 MCF | May 2009 - Dec 2013 |
| Parmt LLC | Montana | 0 BBLs | 0 MCF | Oct 2016 - Sep 2018 |
| Parsell, R. W. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Parsell, R.F. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Oct 2004 |
| Parsell, RF Partnership | Montana | 0 BBLs | 0 MCF | May 2002 - Aug 2023 |
| Pearl Montana Exploration And Production LTD. | Montana | 0 BBLs | 0 MCF | Dec 2007 - Oct 2010 |
| Pearson, Gabriel | Montana | 0 BBLs | 0 MCF | Apr 2013 - Mar 2024 |
| Pennzoil Exploration And Production Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 1992 |
| Petaja Brothers Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Sep 1997 |
| Petro Productions,Petrotec Production,Inc Dba | Montana | 0 BBLs | 0 MCF | Jan 1986 - Aug 1993 |
| Petro-Hunt Corporation | Montana | 0 BBLs | 0 MCF | May 1996 - Apr 1998 |
| Petro-Hunt, LLC | Montana | 24,065 BBLs | 23,013 MCF | Jan 1991 - Mar 2024 |
| Petro-Sentinel LLC | Montana | 0 BBLs | 0 MCF | Jun 2015 - Jan 2016 |
| Petroleum Engineering & Management Corp. | Montana | 0 BBLs | 0 MCF | Apr 1996 - Jul 2018 |
| Petroleum, Inc. | Montana | 0 BBLs | 0 MCF | Aug 1991 - Aug 2000 |
| Petrox Petroleum Company | Montana | 37 BBLs | 0 MCF | Apr 2023 - Feb 2024 |
| Phillips Petroleum Company | Montana | 0 BBLs | 0 MCF | Sep 1988 - Oct 1995 |
| Phoenix Energy, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2023 |
| Phoenix Production Co. | Montana | 0 BBLs | 0 MCF | Apr 1996 - Oct 2002 |
| Pinnacle Energy Group, LLC | Montana | 0 BBLs | 0 MCF | Dec 2002 - Nov 2017 |
| Pinnacle Gas Resources, Inc. | Montana | 0 BBLs | 0 MCF | Apr 2005 - Mar 2011 |
| Pintail Petroleum, Inc. | Montana | 0 BBLs | 0 MCF | Jul 1993 - Oct 2003 |
| Pintail Petroleum, LTD. | Montana | 0 BBLs | 0 MCF | Nov 2003 - Nov 2007 |
| Pittencrieff America, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Mar 1997 |
| Plains Petroleum Operating Co. | Montana | 0 BBLs | 0 MCF | Dec 1991 - May 1997 |
| Pondera Partners Limited Partnership | Montana | 0 BBLs | 0 MCF | Jan 1991 - Sep 2023 |
| Potlatch Oil & Refining Co | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Prairie Dog Exploration, LLC | Montana | 0 BBLs | 0 MCF | Jul 2002 - Jun 2009 |
| Prairie Energy, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2002 |
| Presco, Inc. | Montana | 0 BBLs | 0 MCF | Sep 2005 - Oct 2020 |