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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Tyler Rockies Exploration LTD | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 2021 |
| Tyrex Oil Company | Montana | 0 BBLs | 0 MCF | May 1996 - May 1997 |
| U Bee Tea Production LLC | Montana | 456 BBLs | 47 MCF | Nov 2021 - Sep 2024 |
| Union Oil Company Of California | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 1996 |
| Unit Petroleum Company | Montana | 0 BBLs | 0 MCF | Feb 2003 - Mar 2022 |
| United States Energy Corp. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jun 2024 |
| Upton Resources U.S.A., Inc. | Montana | 0 BBLs | 0 MCF | Oct 1997 - Jun 2010 |
| Ursa Major (Crow Og), LLC | Montana | 0 BBLs | 0 MCF | Aug 2009 - Aug 2017 |
| Ursa Resources Group, LLC | Montana | 0 BBLs | 0 MCF | Apr 2011 - Jul 2011 |
| Vaalco Energy (USA), Inc. | Montana | 0 BBLs | 0 MCF | Nov 2012 - May 2014 |
| Vecta Oil & Gas, LTD. | Montana | 0 BBLs | 0 MCF | Feb 2013 - Aug 2024 |
| Vess Oil Corporation | Montana | 0 BBLs | 0 MCF | Oct 2011 - Nov 2022 |
| Vesta, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Mar 1997 |
| Viking Resources Corporation | Montana | 0 BBLs | 0 MCF | Apr 1996 - Apr 1998 |
| Vintage Petroleum, Inc. | Montana | 0 BBLs | 0 MCF | Apr 1996 - Oct 2001 |
| Walter S. Fees, Jr. & Son Oil & Gas LLC | Montana | 0 BBLs | 0 MCF | Mar 2017 - Jul 2024 |
| Ward Petroleum Corp. | Montana | 0 BBLs | 0 MCF | Dec 1991 - Mar 2002 |
| Wbi Energy Transmission, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1986 - Nov 1999 |
| Wbi Production, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2001 |
| Wesco Operating, Inc. | Montana | 0 BBLs | 0 MCF | Jun 1999 - Aug 2024 |
| West Gas Inc | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 1997 |
| Westech Energy Corporation | Montana | 0 BBLs | 0 MCF | Dec 2000 - Mar 2011 |
| Western Meadowlark Resources LLC | Montana | 0 BBLs | 0 MCF | Apr 2019 - Aug 2024 |
| Western Montana Oil Co | Montana | 0 BBLs | 0 MCF | Jun 1991 - May 2002 |
| Western Natural Gas Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2024 |
| Westport Oil & Gas Company LP | Montana | 0 BBLs | 0 MCF | Feb 1994 - Dec 2006 |
| Weststar Energy, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2010 |
| Wexco Exploration, LLC | Montana | 0 BBLs | 0 MCF | Sep 2013 - May 2015 |
| Wheless Industries, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Sep 2002 |
| White Rock Oil & Gas, LLC | Montana | 240,646 BBLs | 223,960 MCF | Jan 2015 - Sep 2024 |
| Whiting Oil And Gas Corporation | Montana | 37,222 BBLs | 53,575 MCF | Oct 2003 - Sep 2024 |
| Whiting Petroleum Corp | Montana | 0 BBLs | 0 MCF | Jun 1999 - Aug 1999 |
| Whiting Petroleum Corporation | Montana | 0 BBLs | 0 MCF | Sep 1999 - Sep 2003 |
| Williston Industrial Supply Corporation | Montana | 0 BBLs | 0 MCF | Jan 1991 - Oct 2011 |
| Woods, Pete Or Maxine | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2024 |
| Wyoming Resources Corporation | Montana | 0 BBLs | 0 MCF | Oct 1991 - Dec 2017 |
| Xeno, Inc | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2001 |
| Xeric Oil & Gas Corporation | Montana | 0 BBLs | 0 MCF | Jan 1991 - Oct 2010 |
| Xoil Inc. | Montana | 0 BBLs | 0 MCF | Mar 1991 - Oct 2022 |
| XTO Energy Inc. | Montana | 0 BBLs | 0 MCF | Jul 2008 - Nov 2021 |
| Yellow Queen Uranium Co. | Montana | 0 BBLs | 0 MCF | Apr 2004 - Oct 2010 |
| Yellowstone Petroleums, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2024 |
| Zenergy Operating Company, LLC | Montana | 0 BBLs | 0 MCF | Nov 2008 - Oct 2010 |
| Zimco (Robt A Zimmerman) | Montana | 0 BBLs | 0 MCF | Jan 1991 - Apr 2009 |
| Zimmerman, Brent | Montana | 0 BBLs | 0 MCF | May 2009 - Sep 2012 |