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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Grand Mesa Operating Company | Kansas | 9,008 BBLs | 23,818 MCF | Jan 1980 - Mar 2025 |
| Granite Creek Energy LLC | Montana | 9,431 BBLs | 7,440 MCF | Mar 2024 - Apr 2025 |
| Granite Creek Energy LLC | Wyoming | 20,039 BBLs | 107 MCF | May 2023 - May 2025 |
| Grayson Mill Operating, LLC | North Dakota | 2,084,078 BBLs | 9,655,243 MCF | Nov 2021 - May 2025 |
| Great American Royalties, Inc. | North Dakota | 1,520 BBLs | 0 MCF | Dec 1979 - Jun 2025 |
| Great Plains Energy, Inc. | Kansas | 1,609 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| Green Reserve Energy Holdings LLC | Wyoming | 6,824 BBLs | 1,061 MCF | Dec 2020 - May 2025 |
| Greenwood Resources L.L.C. | Kansas | 1,203 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| Greylock Production LLC | Wyoming | 10,290 BBLs | 787,524 MCF | Feb 2022 - May 2025 |
| Greylock Production, LLC | Utah | 18,914 BBLs | 1,151,291 MCF | Apr 2022 - Apr 2025 |
| Griffin & Griffin Expl, LLC | Louisiana | 2,331 BBLs | 0 MCF | Feb 2007 - Dec 2024 |
| Griffin, Charles N. | Kansas | 14,719 BBLs | 15,232 MCF | Jun 1980 - Mar 2025 |
| GRMR Oil & Gas LLC | Colorado | 2,129 BBLs | 2,232 MCF | Sep 2014 - Apr 2025 |
| Gulf Production Company, Inc. | Louisiana | 1,398 BBLs | 0 MCF | Apr 1992 - Dec 2024 |
| Gunnison Energy LLC | Colorado | 0 BBLs | 449,974 MCF | Jul 2014 - Apr 2025 |
| H & B Petroleum Corp. | Kansas | 7,319 BBLs | 726 MCF | Jan 1980 - Mar 2025 |
| H & C Oil Operating Inc. | Kansas | 4,935 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| H & D Exploration LLC | Kansas | 1,549 BBLs | 1,238 MCF | May 1983 - Mar 2025 |
| H L Brown Operating, LLC | New Mexico | 5,264 BBLs | 9,734 MCF | Jun 2001 - Apr 2025 |
| H R F Exploration And Production LLC | Michigan | 0 BBLs | 126,609 MCF | Jan 2006 - May 2025 |
| 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 |
| Hanson Operating Co Inc | New Mexico | 2,072 BBLs | 5,301 MCF | Jan 1993 - Apr 2025 |
| Hartman Oil Co., Inc. | Kansas | 15,741 BBLs | 9,373 MCF | Jan 1980 - Mar 2025 |
| Harvard Petroleum Company, LLC | New Mexico | 49,985 BBLs | 173,120 MCF | Jan 1993 - May 2025 |
| Harvest Petroleum Partners, LLC | New Mexico | 1,391 BBLs | 1,502 MCF | Mar 2024 - Apr 2025 |
| Hawkins Oil, LLC | Kansas | 1,586 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| Henergy Oil & Gas LLC | Louisiana | 1,623 BBLs | 0 MCF | Mar 2019 - Jan 2025 |
| Herman L. Loeb, LLC | Kansas | 22,129 BBLs | 103,054 MCF | Jan 1980 - Mar 2025 |
| Hertel Oil Company LLC | Kansas | 1,341 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| Hess Bakken Investments II, LLC | North Dakota | 2,885,317 BBLs | 12,189,599 MCF | Jan 2014 - May 2025 |
| Hess Oil Company | Kansas | 6,139 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| HG Oil Holdings, LLC | Kansas | 16,455 BBLs | 191 MCF | Jan 2020 - Mar 2025 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 80,359 MCF | Aug 2019 - Apr 2025 |
| High River Resources Operating, LLC | New Mexico | 5,268 BBLs | 426,717 MCF | Nov 2023 - May 2025 |
| Hilcorp Alaska, LLC | Alaska | 2,636,102 BBLs | 37,985,699 MCF | May 2006 - May 2025 |
| Hilcorp Energy Company | Colorado | 216 BBLs | 1,827,952 MCF | Dec 2005 - May 2025 |
| Hilcorp Energy Company | New Mexico | 64,499 BBLs | 23,803,359 MCF | Aug 2017 - Apr 2025 |
| Hilcorp Energy Company | Wyoming | 22,473 BBLs | 3,143,210 MCF | Jun 1997 - May 2025 |
| Hilcorp Energy Company, Inc. | Alabama | 18,977 BBLs | 152,332 MCF | Oct 1976 - Mar 2025 |
| Hilcorp North Slope, LLC | Alaska | 6,086,567 BBLs | 255,385,511 MCF | Jan 2019 - May 2025 |
| Hillenburg Oil Co., A General Partnership | Kansas | 2,134 BBLs | 0 MCF | Jan 1980 - Mar 2025 |
| Howell Oil Company, Inc. | Kansas | 2,160 BBLs | 0 MCF | Jul 1985 - Mar 2025 |
| Hudson Oil Company Of Texas | New Mexico | 2,112 BBLs | 3,798 MCF | Jan 1993 - Apr 2025 |
| Hughes Eastern Corporation | Alabama | 1,658 BBLs | 6,714 MCF | Sep 1977 - Mar 2025 |
| Hunt Oil Company | North Dakota | 510,881 BBLs | 448,363 MCF | Aug 1956 - May 2025 |
| Huntington Energy LLC | Wyoming | 2,883 BBLs | 1,725 MCF | Dec 2006 - May 2025 |
| Huntington Energy, LLC | New Mexico | 0 BBLs | 28,485 MCF | Apr 2003 - May 2025 |
| Hyperion Oil & Gas LLC | Wyoming | 6,195 BBLs | 43,031 MCF | Feb 2010 - May 2025 |
| Ia Operating, Inc. | Kansas | 6,555 BBLs | 0 MCF | Apr 1997 - Mar 2025 |