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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Chandler Energy, LLC | Montana | 0 BBLs | 0 MCF | May 2002 - Jan 2009 |
| Chaparral Energy, LLC | Montana | 0 BBLs | 0 MCF | Jul 2000 - Dec 2011 |
| Charger Resources, LLC | Montana | 0 BBLs | 0 MCF | Jan 2012 - Dec 2014 |
| Charoil Co., J. Norm And Charlotte Sibley Dba | Montana | 0 BBLs | 0 MCF | Jan 1986 - Oct 2002 |
| Chelin LLC | Montana | 0 BBLs | 0 MCF | Aug 2014 - Dec 2025 |
| Chesapeake Operating, LLC | Montana | 0 BBLs | 0 MCF | Jun 1994 - Jul 2008 |
| Chippewa Cree Tribe | Montana | 0 BBLs | 8,151 MCF | Jan 2014 - Jan 2026 |
| Choctaw II Oil & Gas LTD. | Montana | 0 BBLs | 0 MCF | Dec 1990 - Jan 2002 |
| Cirque Resources LP | Montana | 0 BBLs | 0 MCF | Nov 2011 - Nov 2013 |
| Citation Oil & Gas Corp. | Montana | 15,341 BBLs | 952 MCF | Jan 1991 - Jan 2026 |
| Citation Oilfield Supply & Leasing, LTD. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 1993 |
| City Of Baker | Montana | 0 BBLs | 517 MCF | Mar 2005 - Jan 2026 |
| Cline Production Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 2025 |
| Cline Production Company | Montana | 0 BBLs | 0 MCF | Dec 1995 - Mar 2024 |
| Coalridge Disposal And Petroleum, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Feb 2024 |
| Cody Energy, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1996 - May 1998 |
| Collins & Ware, Inc. | Montana | 0 BBLs | 0 MCF | Oct 1997 - Jun 2000 |
| Colossus Operating LLC | Montana | 0 BBLs | 0 MCF | Mar 2022 - Dec 2025 |
| Colt Resources Corporation | Montana | 0 BBLs | 0 MCF | Nov 1997 - Dec 2000 |
| Columbia Petroleum, LTD. | Montana | 16 BBLs | 0 MCF | Jan 1991 - Jan 2026 |
| Columbus Energy Corp. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jun 2007 |
| Columbus Energy, LLC | Montana | 0 BBLs | 0 MCF | Jul 2007 - Dec 2007 |
| Comanche Drilling Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2026 |
| Compass Energy, Inc. | Montana | 0 BBLs | 0 MCF | Mar 2006 - Feb 2007 |
| Constitution Gas Transport Co., Inc. | Montana | 0 BBLs | 0 MCF | Sep 1995 - Jun 2012 |
| Contango Resources, Inc. | Montana | 18,396 BBLs | 92,719 MCF | Dec 2020 - Feb 2026 |
| Continental Resources Inc | Montana | 192,166 BBLs | 330,165 MCF | Jan 1991 - Jan 2026 |
| Cool Spring Colony, Inc. | Montana | 0 BBLs | 0 MCF | Mar 2024 - Dec 2025 |
| Coolidge, G. B., Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2016 |
| Coolidge, Paul | Montana | 0 BBLs | 0 MCF | Feb 1991 - Sep 2025 |
| Coolidge, Tim & Billiette | Montana | 0 BBLs | 0 MCF | Sep 2003 - Sep 2025 |
| Coolidge, Timothy J & Billiette Nebel | Montana | 0 BBLs | 0 MCF | Mar 1991 - Sep 2025 |
| Coolidge, Timothy J. | Montana | 0 BBLs | 0 MCF | Apr 1991 - Sep 2000 |
| Cortez Operating Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2004 |
| Costilla Energy, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Apr 1999 |
| Cowry Enterprises, LTD. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2022 |
| Croft Oil & Gas | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jun 2000 |
| Croft Petroleum Co. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2022 |
| Crown Oil, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1996 - Jan 1999 |
| Crusader Energy Group Inc. | Montana | 0 BBLs | 0 MCF | Sep 2008 - Jul 2011 |
| Crusader Holdings, LLC | Montana | 0 BBLs | 0 MCF | Dec 2010 - May 2011 |
| Cut Bank Gas Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2025 |
| CWT Operating, LLC | Montana | 0 BBLs | 0 MCF | Dec 2021 - Nov 2025 |
| Czar Resource Inc. | Montana | 0 BBLs | 0 MCF | Jul 1991 - Mar 2000 |
| D & C Oil | Montana | 0 BBLs | 0 MCF | Jan 1991 - Apr 1997 |
| D & H Energy, LLC | Montana | 715 BBLs | 6,061 MCF | Jul 2016 - Jan 2026 |
| D & M Welding LLC | Montana | 0 BBLs | 0 MCF | Nov 2003 - Dec 2025 |
| D90 Energy, LLC | Montana | 0 BBLs | 0 MCF | Jan 2020 - Aug 2025 |
| Danielson, Lloyd Or Danielson, Patricia | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2000 |
| Danielson, Patricia | Montana | 0 BBLs | 0 MCF | Jun 2000 - Jan 2026 |