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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| NRG Associates | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - May 1982 |
| Nucor Oil & Gas Inc | Wyoming | 0 BBLs | 0 MCF | May 2005 - Dec 2025 |
| Nupec Resources Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1984 - Dec 1984 |
| Nupetco Associates | Wyoming | 0 BBLs | 0 MCF | Jan 1992 - Dec 2022 |
| O'Brien Energy Resources Corporation | Wyoming | 980 BBLs | 0 MCF | Feb 2002 - Jan 2026 |
| Ocean Energy Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Aug 2001 |
| Oci LLC | Wyoming | 0 BBLs | 0 MCF | Oct 2011 - Jan 2024 |
| Odessa Natural Corporation | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1981 |
| Oedekoven Amerifields Resources LLC | Wyoming | 0 BBLs | 0 MCF | Jul 2013 - Dec 2025 |
| Oedekoven Fred L | Wyoming | 0 BBLs | 0 MCF | Apr 1981 - Jan 1983 |
| Oedekoven Water & Hot Oil | Wyoming | 0 BBLs | 0 MCF | May 1984 - Feb 2026 |
| Ogle Corporation | Wyoming | 0 BBLs | 0 MCF | Sep 1979 - Dec 1979 |
| Oil & Gas Acquisition Group Inc | Wyoming | 0 BBLs | 0 MCF | Nov 1996 - May 2003 |
| Oil Mountain Energy Inc | Wyoming | 1,036 BBLs | 0 MCF | Oct 2018 - Feb 2026 |
| Oildigger Resources Fund L LLLP | Wyoming | 7,766 BBLs | 4,610 MCF | Sep 2016 - Feb 2026 |
| Oilfield Consultants | Wyoming | 0 BBLs | 0 MCF | Jan 1985 - Dec 1987 |
| Oilfield Salvage & Service Company | Wyoming | 2,046 BBLs | 1,800 MCF | Jan 1978 - Jan 2026 |
| Okie Crude Company | Wyoming | 0 BBLs | 0 MCF | Jul 1987 - Nov 1994 |
| Oklahoma Oil Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1983 |
| Oklahoma Pacific LTD | Wyoming | 0 BBLs | 0 MCF | Jan 1995 - Aug 1995 |
| Okmar Oil Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1990 |
| Okt Petroleum Company Inc | Wyoming | 0 BBLs | 0 MCF | Aug 1996 - Sep 1996 |
| Olds Oil Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 1988 |
| Olympic Exploration Inc | Wyoming | 0 BBLs | 0 MCF | Nov 1980 - Jul 2004 |
| Omimex Petroleum Inc (Co) | Wyoming | 0 BBLs | 0 MCF | Jan 1986 - May 2001 |
| Omimex Petroleum Inc (De) | Wyoming | 0 BBLs | 0 MCF | Dec 2008 - Aug 2020 |
| Omni Operating Company | Wyoming | 0 BBLs | 0 MCF | Jan 1983 - Sep 2001 |
| Oneida Energy Corporation | Wyoming | 0 BBLs | 0 MCF | Sep 1990 - Jul 2003 |
| Onshore Holdings LLC | Wyoming | 0 BBLs | 0 MCF | Oct 2013 - Apr 2016 |
| Open Range Energy LLC | Wyoming | 0 BBLs | 0 MCF | May 2018 - Mar 2025 |
| Opes Production Inc | Wyoming | 0 BBLs | 0 MCF | Jan 2005 - Mar 2015 |
| Orion Energy Partners LP | Wyoming | 0 BBLs | 0 MCF | Nov 2008 - Jul 2010 |
| Oryx Energy Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Apr 1995 |
| Osage Hot Oil Service | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jul 1997 |
| Osage Operating Company LLC | Wyoming | 0 BBLs | 0 MCF | Oct 1996 - May 2006 |
| Osage Partners LLC | Wyoming | 129 BBLs | 0 MCF | Jan 2013 - Feb 2026 |
| Osborn Heirs Company LTD | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 2022 |
| Ott Inc | Wyoming | 0 BBLs | 0 MCF | Mar 2018 - Oct 2025 |
| Outlaw Oil And Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2022 - Nov 2024 |
| Outre' | Wyoming | 0 BBLs | 0 MCF | Aug 1986 - Dec 1986 |
| Overland Resources LLC | Wyoming | 0 BBLs | 0 MCF | Dec 2010 - Feb 2019 |
| Overland Resources LTD | Wyoming | 0 BBLs | 0 MCF | Jan 2003 - Nov 2010 |
| Ovintiv USA Inc | Wyoming | 0 BBLs | 0 MCF | Mar 2001 - Jan 2026 |
| Owl Technical Services Inc | Wyoming | 0 BBLs | 0 MCF | Jul 2005 - May 2006 |
| Oxbow Properties Inc | Wyoming | 0 BBLs | 0 MCF | Jun 2015 - Jan 2025 |
| Oxford Exploration Company | Wyoming | 0 BBLs | 0 MCF | Aug 1988 - Jun 1995 |
| Oxtex Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1983 - Oct 1989 |
| Oxy Petroleum Inc | Wyoming | 0 BBLs | 0 MCF | Jul 1982 - Jan 1986 |
| Oxy USA Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Sep 2024 |
| P & M Petroleum Management LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - May 2014 |