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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Hardrock Oil Company | Montana | 0 BBLs | 441 MCF | Jan 1991 - Feb 2025 |
| Hawkins, Robert S. | Montana | 0 BBLs | 0 MCF | Nov 1990 - Jun 2018 |
| Hawley & Desimon | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2024 |
| Hawley Hydrocarbons, Merrill&Carol Hawley Dba | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2025 |
| Hawley Oil Company | Montana | 0 BBLs | 0 MCF | Nov 1986 - Dec 2024 |
| Hawley-Northrup | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2025 |
| Haynes, Keisel | Montana | 0 BBLs | 0 MCF | Nov 1995 - Dec 2014 |
| HB Oil, LLC | Montana | 0 BBLs | 0 MCF | Mar 2023 - Feb 2025 |
| Headington Oil Company LLC | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2008 |
| Helis Oil And Gas Company, LLC | Montana | 0 BBLs | 0 MCF | Dec 2003 - Oct 2010 |
| Hell Creek Crude LLC | Montana | 140 BBLs | 0 MCF | Nov 2024 - Feb 2025 |
| Herco Exploration LLC | Montana | 0 BBLs | 0 MCF | May 2006 - Oct 2024 |
| Hi-Dezert, Wesley Miller Dba | Montana | 0 BBLs | 0 MCF | Feb 2000 - Mar 2006 |
| Highlands Montana Corporation | Montana | 0 BBLs | 0 MCF | Oct 2016 - Dec 2021 |
| Highline Exploration, Inc. | Montana | 0 BBLs | 0 MCF | Jul 2007 - Nov 2020 |
| Hillcrest Exploration, Inc. | Montana | 0 BBLs | 0 MCF | Feb 2012 - Jun 2012 |
| Hinto Energy, LLC | Montana | 0 BBLs | 0 MCF | Aug 2013 - Mar 2017 |
| Hofland, James D. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2025 |
| Homestake Oil & Gas Co. | Montana | 187 BBLs | 0 MCF | Jan 1991 - Feb 2025 |
| Howell Petroleum Corp. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Feb 2007 |
| HRC Operating, LLC | Montana | 0 BBLs | 0 MCF | Jan 2008 - Oct 2015 |
| HS Resources, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Aug 2000 |
| Huber, J.M., Corporation | Montana | 0 BBLs | 0 MCF | Jan 2010 - Nov 2011 |
| Hugoton Energy Corporation | Montana | 0 BBLs | 0 MCF | Oct 1997 - Jun 1998 |
| Humble Oil & Refining Co. | Montana | 0 BBLs | 0 MCF | Nov 1995 - Sep 1999 |
| Humes Oil Company | Montana | 0 BBLs | 0 MCF | Feb 1994 - Dec 1995 |
| Hunter Energy LLC | Montana | 0 BBLs | 0 MCF | Jul 2010 - Apr 2012 |
| Huntington Energy, LLC | Montana | 57 BBLs | 0 MCF | May 2010 - Feb 2025 |
| Huntington Resources, Inc. | Montana | 0 BBLs | 0 MCF | Mar 1993 - Oct 2006 |
| Hydra Inc. | Montana | 0 BBLs | 0 MCF | Jun 1996 - Oct 2022 |
| Impact Global Resources, LLC | Montana | 0 BBLs | 0 MCF | Jun 2015 - Sep 2016 |
| Intermountain Leasing, Inc. | Montana | 0 BBLs | 0 MCF | Feb 2000 - Mar 2020 |
| Intermountain Operating, Inc. | Montana | 0 BBLs | 0 MCF | Feb 1991 - Jul 2001 |
| Interstate Explorations, LLC | Montana | 419 BBLs | 0 MCF | Apr 2014 - Feb 2025 |
| Intoil, Inc. | Montana | 0 BBLs | 0 MCF | Apr 1991 - Dec 2002 |
| Iofina Natural Gas, Inc. | Montana | 0 BBLs | 0 MCF | Sep 2008 - Apr 2020 |
| J & G Operating | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2000 |
| J H Oil Company (James Hofland) | Montana | 0 BBLs | 0 MCF | Jul 1992 - Jun 2015 |
| J.H.R. Corp. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2001 |
| J.J. Bunkirt Oil & Gas Corp. | Montana | 0 BBLs | 0 MCF | Aug 2001 - Aug 2020 |
| J.P. Oil & Gas Operations, Inc. | Montana | 0 BBLs | 0 MCF | Jul 1999 - Aug 1999 |
| Jake Oil, LLC | Montana | 0 BBLs | 0 MCF | Nov 2005 - Feb 2022 |
| JN Exploration & Production LTD Partnership | Montana | 0 BBLs | 0 MCF | Jan 1991 - Feb 2001 |
| Journey Operating, LLC | Montana | 0 BBLs | 0 MCF | Jul 2000 - May 2006 |
| Jurassic Resources Development Na LLC | Montana | 0 BBLs | 10,600 MCF | Jan 1991 - Feb 2025 |
| K2 America Corporation | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 2017 |
| Kaiser-Francis Oil Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Mar 2005 |
| Karsted Operating, LLC | Montana | 658 BBLs | 0 MCF | Sep 2021 - Feb 2025 |
| KCS Resources, Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Nov 2001 |
| Keesun Corporation | Montana | 0 BBLs | 0 MCF | Jan 1991 - Feb 2025 |