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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| 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 | 143 BBLs | 0 MCF | Jan 2013 - Jul 2025 |
| Osborn Heirs Company LTD | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Jun 2022 |
| Ott Inc | Wyoming | 0 BBLs | 0 MCF | Mar 2018 - Jul 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 - Jul 2025 |
| 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 |
| Qep Energy Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Mar 2020 |
| Quadra Oil & Gas Inc | Wyoming | 0 BBLs | 0 MCF | May 1987 - Oct 1990 |
| Qualmay Development LLC | Wyoming | 0 BBLs | 0 MCF | Jun 2003 - Jun 2023 |
| Quest Energy Corporation | Wyoming | 0 BBLs | 0 MCF | Sep 1984 - Feb 1989 |
| Quest Operating LLC | Wyoming | 0 BBLs | 0 MCF | Jan 1999 - Sep 2008 |
| Quicksilver Resources Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1991 - Jun 2013 |
| Quinoco Petroleum Inc | Wyoming | 0 BBLs | 0 MCF | Nov 1983 - Dec 1990 |
| Quintana Petroleum Corp | Wyoming | 0 BBLs | 0 MCF | Jul 1981 - Dec 1994 |
| Rael Resources LLC | Wyoming | 375 BBLs | 0 MCF | Dec 2011 - Jun 2025 |
| Rainbow Oil Company | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Aug 1999 |
| Rainbow Resources Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Aug 1982 |
| Ramco Oil And Gas Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1982 - Jun 1995 |
| Ramshorn Construction Inc | Wyoming | 0 BBLs | 0 MCF | Sep 2010 - May 2012 |
| Ranch Oil Company | Wyoming | 1,757 BBLs | 0 MCF | Jan 1986 - Jul 2025 |
| Ranch Resources LLC | Wyoming | 0 BBLs | 0 MCF | Aug 2019 - Nov 2019 |
| Ranck Oil Company | Wyoming | 0 BBLs | 0 MCF | Jan 1997 - Jul 2001 |
| Randolph Rex L Oil Properties | Wyoming | 0 BBLs | 0 MCF | Jan 2001 - Jan 2001 |
| Ranger Holdings Co | Wyoming | 0 BBLs | 0 MCF | Mar 1983 - Jul 1993 |
| Rangeview Resources Operating Co | Wyoming | 7,923 BBLs | 611,363 MCF | Jul 2022 - Jun 2025 |
| Rathbun Roger | Wyoming | 0 BBLs | 0 MCF | Jan 1987 - Dec 1993 |
| Rathpro Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1982 - Feb 1994 |
| Rawhide Western Inc | Wyoming | 0 BBLs | 0 MCF | May 1992 - Dec 2007 |
| RB Operating Company | Wyoming | 0 BBLs | 0 MCF | May 1989 - Feb 1997 |
| RBJ Oil LLC | Wyoming | 0 BBLs | 0 MCF | Mar 2009 - Apr 2021 |
| RDG Oil & Gas LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2006 - Mar 2017 |
| Reading & Bates Petroleum | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Apr 1989 |
| Ready Roger | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1979 |
| Red Bluff Energy LLC | Wyoming | 0 BBLs | 0 MCF | May 2009 - Oct 2021 |