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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Grand Mesa Operating Company | Kansas | 11,555 BBLs | 19,511 MCF | Jan 1980 - Mar 2026 |
| Granite Creek Energy LLC | Montana | 7,904 BBLs | 4,299 MCF | Mar 2024 - Apr 2026 |
| Granite Creek Energy LLC | North Dakota | 1,233 BBLs | 1,653 MCF | Jan 2026 - May 2026 |
| Great American Royalties, Inc. | North Dakota | 1,488 BBLs | 0 MCF | Dec 1979 - Jun 2026 |
| Great Plains Energy, Inc. | Kansas | 1,792 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Green Valley Operating, LLC | Montana | 2,795 BBLs | 1,899 MCF | Jun 2022 - May 2026 |
| Greenwood Resources L.L.C. | Kansas | 1,257 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Greylock Production, LLC | Utah | 20,993 BBLs | 1,185,751 MCF | Apr 2022 - May 2026 |
| Griffin & Griffin Expl, LLC | Louisiana | 2,331 BBLs | 0 MCF | Feb 2007 - Dec 2024 |
| Griffin & Griffin Exploration LLC | Mississippi | 1,242 BBLs | 0 MCF | May 2000 - Apr 2026 |
| Gulf Production Company, Inc. | Louisiana | 1,398 BBLs | 0 MCF | Apr 1992 - Dec 2024 |
| H & B Petroleum Corp. | Kansas | 7,802 BBLs | 785 MCF | Jan 1980 - Mar 2026 |
| H & C Oil Operating Inc. | Kansas | 4,319 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| H & D Exploration LLC | Kansas | 1,674 BBLs | 1,565 MCF | May 1983 - Mar 2026 |
| H R F Antrim LP | Michigan | 0 BBLs | 33,255 MCF | Mar 1989 - May 2026 |
| H R F Exploration And Production LLC | Michigan | 0 BBLs | 127,470 MCF | Jan 2006 - May 2026 |
| Hadley/Jackson Energy LLC | Wyoming | 1,339 BBLs | 0 MCF | Nov 2019 - May 2026 |
| Hale Oil | Louisiana | 1,585 BBLs | 0 MCF | Jan 1995 - Dec 2024 |
| Hale Oil Co. | Louisiana | 1,611 BBLs | 0 MCF | Apr 1985 - Jan 2025 |
| Hartman Oil Co., Inc. | Kansas | 16,693 BBLs | 9,496 MCF | Jan 1980 - Mar 2026 |
| Harvard Petroleum Company, LLC | New Mexico | 46,007 BBLs | 158,187 MCF | Jan 1993 - May 2026 |
| Harvest Petroleum Partners, LLC | New Mexico | 1,243 BBLs | 554 MCF | Mar 2024 - May 2026 |
| Hawkins Oil, LLC | Kansas | 1,766 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Hawley & Desimon | Montana | 978 BBLs | 0 MCF | Jan 1991 - May 2026 |
| Hayden Operating | Kansas | 879 BBLs | 586 MCF | Jan 1983 - Mar 2026 |
| Hayes Oil & Gas LLC | Kansas | 629 BBLs | 11,364 MCF | Jan 1980 - Mar 2026 |
| Henergy Oil & Gas LLC | Louisiana | 1,623 BBLs | 0 MCF | Mar 2019 - Jan 2025 |
| Herman L. Loeb, LLC | Kansas | 23,806 BBLs | 99,276 MCF | Jan 1980 - Mar 2026 |
| Hertel Oil Company LLC | Kansas | 1,549 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Hess Bakken Investments II, LLC | North Dakota | 2,940,537 BBLs | 12,930,546 MCF | Jan 2014 - May 2026 |
| Hess Oil Company | Kansas | 7,259 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| HG Oil Holdings, LLC | Kansas | 16,647 BBLs | 3,138 MCF | Jan 2020 - Mar 2026 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 84,185 MCF | Jan 1999 - May 2026 |
| Highmark Energy Operating, LLC | Mississippi | 74,094 BBLs | 0 MCF | Jan 2025 - May 2026 |
| Hilcorp Alaska, LLC | Alaska | 7,870,320 BBLs | 281,397,383 MCF | May 2006 - Mar 2026 |
| Hilcorp Energy Company | New Mexico | 208,190 BBLs | 23,638,895 MCF | Aug 2017 - May 2026 |
| Hilcorp Energy Company, Inc. | Alabama | 20,616 BBLs | 155,826 MCF | Oct 1976 - Mar 2026 |
| Hillenburg Oil Co., A General Partnership | Kansas | 1,809 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| HK Eagle LLC | Montana | 1,706 BBLs | 0 MCF | Sep 2025 - Apr 2026 |
| Howell Oil Company, Inc. | Kansas | 2,315 BBLs | 0 MCF | Jul 1985 - Mar 2026 |
| Hughes Eastern Corporation | Alabama | 2,515 BBLs | 6,137 MCF | Sep 1977 - Mar 2026 |
| Hughes Eastern Corporation | Louisiana | 871 BBLs | 155 MCF | May 1986 - Dec 2024 |
| Hunt Cimarron Limited Partnership | New Mexico | 990 BBLs | 57 MCF | Sep 1997 - May 2026 |
| Hunt Oil Company | North Dakota | 749,922 BBLs | 651,129 MCF | Aug 1956 - May 2026 |
| Huntington Energy LLC | Wyoming | 2,856 BBLs | 1,365 MCF | Dec 2006 - May 2026 |
| Ia Operating, Inc. | Kansas | 5,323 BBLs | 0 MCF | Apr 1997 - Mar 2026 |
| Igwt, Inc. | Kansas | 896 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Impetro Resources LLC | Colorado | 17,385 BBLs | 406 MCF | Jan 1999 - May 2026 |
| Indian Exploration, Inc. | Louisiana | 1,621 BBLs | 0 MCF | Feb 1992 - Jan 2025 |
| Indian Oil Co., Inc. | Kansas | 4,860 BBLs | 28,380 MCF | Jan 1980 - Mar 2026 |