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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Delphi International Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2023 |
| Deltana, Inc. | Montana | 0 BBLs | 0 MCF | Aug 2001 - Dec 2003 |
| Denbury Onshore, LLC | Montana | 325,367 BBLs | 5,753,638 MCF | Jan 2011 - Feb 2024 |
| Denmark Resources Inc. | Montana | 0 BBLs | 0 MCF | Mar 1991 - Dec 2015 |
| Devon Energy Production Co., LP | Montana | 0 BBLs | 0 MCF | Sep 2004 - Dec 2013 |
| Devon Louisiana Corporation | Montana | 0 BBLs | 0 MCF | Aug 2001 - Jan 2006 |
| Diamond Halo Group LLC | Montana | 0 BBLs | 0 MCF | Dec 2020 - Dec 2023 |
| Diamond Oil & Gas LLC | Montana | 0 BBLs | 0 MCF | Jan 2016 - Jan 2024 |
| Digital Operating Company LLC | Montana | 0 BBLs | 0 MCF | Jun 2021 - Jan 2024 |
| Diversified Operating Corporation | Montana | 0 BBLs | 0 MCF | Mar 2008 - Dec 2010 |
| DL Energy, LLC | Montana | 0 BBLs | 0 MCF | Mar 2007 - Jan 2024 |
| DL Incorporated | Montana | 0 BBLs | 0 MCF | Apr 1991 - Aug 2006 |
| DNR Oil & Gas Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Dominion Oklahoma Texas Exploration & Production | Montana | 0 BBLs | 0 MCF | Dec 1992 - Dec 2006 |
| Double D Energy, LLC | Montana | 0 BBLs | 0 MCF | May 2004 - Nov 2004 |
| Doughty, Earl | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jun 1999 |
| Drawings, LLC | Montana | 0 BBLs | 0 MCF | Apr 2016 - Jan 2024 |
| Dry Coulee Oil & Gas Company | Montana | 0 BBLs | 0 MCF | Jun 1991 - Oct 2003 |
| Eagle Creek Colony | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jan 2024 |
| Eagle Oil & Gas Co. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Aug 2023 |
| Eagle Operating Inc. | Montana | 0 BBLs | 0 MCF | Nov 2023 - Dec 2023 |
| Earthstone Energy, Inc. | Montana | 0 BBLs | 0 MCF | May 2010 - Nov 2016 |
| Earthstone Operating, LLC | Montana | 0 BBLs | 0 MCF | Nov 2016 - Aug 2017 |
| East Outlook Operations, LLC | Montana | 0 BBLs | 0 MCF | May 2012 - Jun 2015 |
| El Paso E&P Company, L.P. | Montana | 0 BBLs | 0 MCF | Jan 2010 - Nov 2010 |
| El Paso Production Oil & Gas Company | Montana | 0 BBLs | 0 MCF | Sep 1993 - Apr 1997 |
| Ellis Co. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 1994 |
| Emep Operating, LLC | Montana | 105,766 BBLs | 171,322 MCF | Jan 2022 - Feb 2024 |
| Empire North Dakota LLC | Montana | 0 BBLs | 0 MCF | Jul 2019 - Jan 2024 |
| Empire Utilities LTD | Montana | 0 BBLs | 0 MCF | May 1992 - Mar 2002 |
| Encana Oil & Gas (USA) Inc. | Montana | 0 BBLs | 0 MCF | Jan 1991 - Oct 2020 |
| Enclave Operating, LLC | Montana | 0 BBLs | 0 MCF | Jun 2004 - May 2014 |
| Encore Operating LP | Montana | 0 BBLs | 0 MCF | Jan 1991 - Dec 2010 |
| Endeavor Energy Resources, LP | Montana | 0 BBLs | 0 MCF | Dec 2000 - Sep 2022 |
| Energy Corporation Of America | Montana | 0 BBLs | 0 MCF | Sep 2010 - Mar 2018 |
| Energy Equity Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - May 2012 |
| Energyquest II, LLC | Montana | 0 BBLs | 0 MCF | Jan 2014 - Jun 2019 |
| Enerplus Resources USA Corporation | Montana | 0 BBLs | 0 MCF | Jan 1994 - Mar 2022 |
| Enneberg Oil & Gas | Montana | 74 BBLs | 0 MCF | Feb 2018 - Feb 2024 |
| Enneberg, Duane T. & Marilyn P. | Montana | 0 BBLs | 0 MCF | Dec 1995 - Nov 2003 |
| EOG Resources, Inc. | Montana | 0 BBLs | 0 MCF | Jul 1998 - Mar 2024 |
| Equinor Energy LP | Montana | 0 BBLs | 0 MCF | Dec 2007 - Apr 2021 |
| Equitable Resources Energy Co, Western Region | Montana | 0 BBLs | 0 MCF | Jan 1991 - May 1997 |
| Equity Oil Company | Montana | 0 BBLs | 0 MCF | Jan 1991 - Jul 2004 |
| Fairways Exploration & Production, LLC | Montana | 0 BBLs | 0 MCF | Apr 2011 - Feb 2024 |
| Faith Drilling, Inc. | Montana | 0 BBLs | 0 MCF | Apr 1996 - Sep 1999 |
| FH Petroleum Corp. | Montana | 0 BBLs | 0 MCF | Jul 2010 - Oct 2017 |
| Fidelity Exploration & Production Co. | Montana | 0 BBLs | 0 MCF | May 2000 - Oct 2015 |
| Five-J.A.B. Inc. | Montana | 0 BBLs | 0 MCF | Jan 2015 - Mar 2016 |
| Florentine Exploration & Production, Inc. | Montana | 0 BBLs | 0 MCF | May 1996 - Mar 1997 |