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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Ultramar Oil & Gas LTD | Wyoming | 0 BBLs | 0 MCF | Sep 1984 - Apr 1992 |
| Underwood Oil & Gas | Wyoming | 45 BBLs | 0 MCF | Aug 1984 - Nov 2025 |
| Unicorn Drilling Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1988 - Dec 1998 |
| Unioil | Wyoming | 0 BBLs | 0 MCF | Sep 1983 - Nov 2004 |
| Union Oil Co Of California | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Dec 1995 |
| Union Texas Petroleum | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Sep 1991 |
| Unit Drilling & Exploration Co | Wyoming | 0 BBLs | 0 MCF | Feb 1983 - Jul 1987 |
| Unit Petroleum Company | Wyoming | 0 BBLs | 0 MCF | Mar 2008 - Mar 2021 |
| United Energy Corporation | Wyoming | 0 BBLs | 0 MCF | Mar 2003 - Mar 2004 |
| United Natural Gas LLC | Wyoming | 0 BBLs | 0 MCF | Apr 2011 - Feb 2020 |
| United Natural Resources Corp | Wyoming | 0 BBLs | 0 MCF | May 1981 - Jan 1986 |
| United Petroleum Corporation | Wyoming | 0 BBLs | 0 MCF | May 1983 - Sep 1991 |
| United Resources Technology Inc | Wyoming | 0 BBLs | 0 MCF | Jul 1992 - Oct 1997 |
| United Utilities Corporation | Wyoming | 0 BBLs | 0 MCF | Aug 1994 - Oct 1998 |
| Universal Fuels Company | Wyoming | 0 BBLs | 0 MCF | Oct 1982 - Jun 1989 |
| Universal Production | Wyoming | 0 BBLs | 0 MCF | Jul 1987 - May 1988 |
| Updike Resources Inc | Wyoming | 0 BBLs | 0 MCF | Sep 1985 - Jun 1998 |
| Urban Oil & Gas Group LLC | Wyoming | 11,545 BBLs | 2,075,065 MCF | Jan 2012 - Oct 2025 |
| Urroz Oil & Gas LLC | Wyoming | 0 BBLs | 0 MCF | Nov 1998 - Jun 2020 |
| Us Ore Corporation | Wyoming | 0 BBLs | 0 MCF | Oct 2006 - Feb 2014 |
| USA Energy LLC | Wyoming | 0 BBLs | 0 MCF | May 2021 - Nov 2024 |
| USA Exploration & Production LLC | Wyoming | 0 BBLs | 0 MCF | May 2009 - Sep 2012 |
| Ute Oil Company | Wyoming | 0 BBLs | 0 MCF | Nov 2002 - Dec 2004 |
| V A Resources LLC | Wyoming | 0 BBLs | 0 MCF | Jun 2000 - Apr 2016 |
| V T Resources Inc | Wyoming | 0 BBLs | 0 MCF | May 1982 - Jul 1999 |
| Valentine Construction Inc | Wyoming | 0 BBLs | 0 MCF | Jan 1998 - Nov 2008 |
| Valero Producing Company | Wyoming | 0 BBLs | 0 MCF | Jan 1983 - Sep 1987 |
| Valkyrie Operating LLC | Wyoming | 6,837 BBLs | 1,934 MCF | Sep 2018 - Nov 2025 |
| Valkyrie Resources LLC | Wyoming | 0 BBLs | 0 MCF | Jun 2018 - Jan 2019 |
| Van Norman Jerry | Wyoming | 0 BBLs | 0 MCF | Jan 1983 - Aug 1989 |
| Van Norman Pipe And Supply | Wyoming | 0 BBLs | 0 MCF | Jan 1978 - Mar 2010 |
| Van Ryan L O | Wyoming | 0 BBLs | 0 MCF | Jan 1985 - May 1993 |
| Vanmark Jack | Wyoming | 0 BBLs | 0 MCF | Jan 1982 - Dec 1997 |
| Vantage Energy Green River LLC | Wyoming | 0 BBLs | 0 MCF | Jul 2010 - Jan 2011 |
| Vantage Point Operating | Wyoming | 0 BBLs | 0 MCF | Jan 1986 - Dec 1994 |
| Vaquero Big Horn LLC | Wyoming | 26,165 BBLs | 0 MCF | May 2018 - Oct 2025 |
| Vaquero Energy Inc | Wyoming | 0 BBLs | 0 MCF | Dec 2010 - Oct 2014 |
| Vast Oil Inc | Wyoming | 0 BBLs | 0 MCF | Oct 2013 - Mar 2024 |
| Vastar Resources Inc | Wyoming | 0 BBLs | 0 MCF | Mar 1994 - Dec 2001 |
| VCP Wyoming LLC | Wyoming | 7,260 BBLs | 0 MCF | Jun 2025 - Oct 2025 |
| Vecta Oil & Gas LTD | Wyoming | 0 BBLs | 0 MCF | Apr 2013 - Jan 2023 |
| Vector Minerals Corporation | Wyoming | 187 BBLs | 1,971 MCF | Jan 1997 - Oct 2025 |
| Vermilion Energy USA LLC | Wyoming | 0 BBLs | 0 MCF | Oct 2014 - Jul 2025 |
| Vermillion Arthur L | Wyoming | 0 BBLs | 0 MCF | Jun 1991 - Dec 1992 |
| Vessels Oil & Gas Company | Wyoming | 0 BBLs | 0 MCF | Jan 1986 - Dec 1998 |
| Vesta Inc | Wyoming | 0 BBLs | 0 MCF | Aug 1992 - Dec 1996 |
| VF Neuhaus Properties Inc | Wyoming | 0 BBLs | 0 MCF | Jun 2001 - Apr 2002 |
| VHJ Energy LLC | Wyoming | 0 BBLs | 0 MCF | Jan 2000 - Jul 2004 |
| Viable Resources Inc | Wyoming | 0 BBLs | 0 MCF | Sep 1980 - Sep 1989 |
| Vicorp Energy Inc | Wyoming | 0 BBLs | 0 MCF | Jul 1978 - Mar 2001 |