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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Grynberg* Jack Dba Grynberg Petroleum Co | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jan 2023 |
| Gulfport Energy Corporation | Colorado | 0 BBLs | 0 MCF | Apr 2010 - Oct 2020 |
| Gungoll Exploration Inc* Carl E | Colorado | 0 BBLs | 0 MCF | May 2000 - Jul 2003 |
| Gunnison Energy Corporation | Colorado | 0 BBLs | 0 MCF | Oct 2001 - Jun 2014 |
| Gunnison Energy LLC | Colorado | 0 BBLs | 337,930 MCF | Jul 2014 - Jul 2025 |
| H & M Petroleum Corporation | Colorado | 0 BBLs | 0 MCF | Oct 2003 - Jun 2025 |
| H & R Well Services, Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Mar 2010 |
| Habco, Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jun 2000 |
| Haines* Richard | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jun 2012 |
| Halde Oil Inc | Colorado | 146 BBLs | 432 MCF | Jan 2000 - Jul 2025 |
| Haley/Hughes Operations | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Apr 2001 |
| Hallwood Petroleum Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jun 2001 |
| Harbour Resources Inc | Colorado | 0 BBLs | 0 MCF | Feb 1999 - Oct 1999 |
| Harburg* Rudolph W | Colorado | 0 BBLs | 0 MCF | May 2008 - Nov 2022 |
| Harsh International Inc | Colorado | 0 BBLs | 0 MCF | Feb 2008 - Dec 2013 |
| Harvest Energy Company | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Aug 2001 |
| Hathaway Operators, Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Dec 2000 |
| Haug* Wanda | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jul 2007 |
| Hayes Oil & Gas Company | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Mar 2005 |
| Headington Oil Company LP | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Mar 2004 |
| Heartland Oil & Gas Company | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jun 2000 |
| Hec Petroleum Inc | Colorado | 0 BBLs | 0 MCF | Jul 2001 - Mar 2006 |
| Helena Resources Inc | Colorado | 492 BBLs | 8,128 MCF | Sep 2017 - Jul 2025 |
| High Plains Energy LLC | Colorado | 0 BBLs | 0 MCF | May 2013 - May 2017 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 72,501 MCF | Aug 2019 - Jul 2025 |
| Highlands Natural Resources Corporation | Colorado | 0 BBLs | 0 MCF | Aug 2017 - May 2018 |
| Highpoint Energy LLC | Colorado | 0 BBLs | 0 MCF | Jan 2015 - Nov 2022 |
| Hilcorp Energy Company | Colorado | 90 BBLs | 1,829,775 MCF | Dec 2005 - Aug 2025 |
| Holcomb Oil & Gas Inc | Colorado | 0 BBLs | 568 MCF | Jan 1999 - Aug 2025 |
| Homestead Oil Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jan 2018 |
| Horseshoe Operating Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Oct 2004 |
| Houston Exploration Company* The | Colorado | 0 BBLs | 0 MCF | Jul 2004 - May 2007 |
| Howell Petroleum Corporation | Colorado | 0 BBLs | 0 MCF | Jan 1999 - May 2005 |
| Hrbek* Randall L | Colorado | 0 BBLs | 0 MCF | Sep 2001 - Jun 2011 |
| HRC Operating LLC | Colorado | 0 BBLs | 0 MCF | Jan 2002 - Dec 2013 |
| HRM Resource A Limited Liability Co | Colorado | 0 BBLs | 0 MCF | Nov 2003 - Aug 2010 |
| HRM Resources II LLC | Colorado | 0 BBLs | 0 MCF | Oct 2014 - Aug 2021 |
| HRM Resources III LLC | Colorado | 0 BBLs | 0 MCF | Feb 2018 - Jun 2022 |
| HRM Resources LLC | Colorado | 0 BBLs | 0 MCF | Apr 2008 - Dec 2014 |
| HS Resources Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Dec 2005 |
| Hubbard Creek Coal Gas LLC | Colorado | 0 BBLs | 6,840 MCF | Aug 2019 - Aug 2025 |
| Hubbs III, LLC | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Mar 2024 |
| Huber Corporation* J M | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Feb 2008 |
| Huntington Energy LLC | Colorado | 0 BBLs | 0 MCF | Jul 2002 - Feb 2025 |
| Hyndrex Resources | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Apr 2018 |
| Impala Resources LLC | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Jul 2002 |
| Impetro Resources LLC | Colorado | 11,996 BBLs | 0 MCF | Mar 2018 - Aug 2025 |
| Incremental Oil & Gas (Florence) LLC | Colorado | 656 BBLs | 111 MCF | May 2012 - Aug 2025 |
| Industrial Gas Services Inc | Colorado | 0 BBLs | 0 MCF | Jan 1999 - Feb 2023 |
| Infinity Oil & Gas Of Wyoming Inc | Colorado | 0 BBLs | 0 MCF | May 2002 - Dec 2007 |