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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Grady Bolding Corporation | Kansas | 3,262 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Grand Mesa Operating Co | Colorado | 2,136 BBLs | 87 MCF | Jan 1999 - Mar 2026 |
| Grand Mesa Operating Company | Kansas | 11,276 BBLs | 23,005 MCF | Jan 1980 - Jan 2026 |
| Granite Creek Energy LLC | Montana | 7,970 BBLs | 4,449 MCF | Mar 2024 - Mar 2026 |
| Granite Creek Energy LLC | North Dakota | 1,648 BBLs | 1,556 MCF | Jan 2026 - Mar 2026 |
| Granite Creek Energy LLC | Wyoming | 16,819 BBLs | 63 MCF | May 2023 - Mar 2026 |
| Great American Royalties, Inc. | North Dakota | 1,539 BBLs | 0 MCF | Dec 1979 - Apr 2026 |
| Great Plains Energy, Inc. | Kansas | 1,942 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Green Reserve Energy Holdings LLC | Wyoming | 7,880 BBLs | 657 MCF | Dec 2020 - Apr 2026 |
| Green Valley Operating, LLC | Montana | 2,559 BBLs | 2,309 MCF | Jun 2022 - Mar 2026 |
| Greenwood Resources L.L.C. | Kansas | 1,349 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Greylock Production, LLC | Utah | 21,006 BBLs | 1,167,973 MCF | Apr 2022 - Mar 2026 |
| Griffin & Griffin Expl, LLC | Louisiana | 2,331 BBLs | 0 MCF | Feb 2007 - Dec 2024 |
| Griffin, Charles N. | Kansas | 10,451 BBLs | 6,920 MCF | Jun 1980 - Jan 2026 |
| Gulf Production Company, Inc. | Louisiana | 1,398 BBLs | 0 MCF | Apr 1992 - Dec 2024 |
| H & B Petroleum Corp. | Kansas | 8,469 BBLs | 718 MCF | Jan 1980 - Jan 2026 |
| H & C Oil Operating Inc. | Kansas | 5,175 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| H & D Exploration LLC | Kansas | 1,416 BBLs | 2,837 MCF | May 1983 - Jan 2026 |
| H R F Antrim LP | Michigan | 0 BBLs | 37,868 MCF | Mar 1989 - Mar 2026 |
| H R F Exploration And Production LLC | Michigan | 0 BBLs | 129,955 MCF | Jan 2006 - Apr 2026 |
| Hadley/Jackson Energy LLC | Wyoming | 1,719 BBLs | 0 MCF | Nov 2019 - Mar 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 | 19,262 BBLs | 11,085 MCF | Jan 1980 - Jan 2026 |
| Harvard Petroleum Company, LLC | New Mexico | 47,181 BBLs | 177,247 MCF | Jan 1993 - Mar 2026 |
| Hawkins Oil, LLC | Kansas | 1,650 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Henergy Oil & Gas LLC | Louisiana | 1,623 BBLs | 0 MCF | Mar 2019 - Jan 2025 |
| Herman L. Loeb, LLC | Kansas | 24,190 BBLs | 121,286 MCF | Jan 1980 - Jan 2026 |
| Hertel Oil Company LLC | Kansas | 1,326 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Hess Bakken Investments II, LLC | North Dakota | 3,146,964 BBLs | 12,699,155 MCF | Jan 2014 - Mar 2026 |
| Hess Oil Company | Kansas | 6,514 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| HG Oil Holdings, LLC | Kansas | 20,201 BBLs | 3,464 MCF | Jan 2020 - Jan 2026 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 70,551 MCF | Jan 1999 - Feb 2026 |
| High River Resources Operating, LLC | New Mexico | 5,001 BBLs | 420,335 MCF | Nov 2023 - Mar 2026 |
| Highmark Energy Operating, LLC | Mississippi | 4,780 BBLs | 0 MCF | Jan 2025 - Feb 2026 |
| Hilcorp Alaska, LLC | Alaska | 7,870,320 BBLs | 281,397,383 MCF | May 2006 - Mar 2026 |
| Hilcorp Energy Company | Colorado | 591 BBLs | 1,804,738 MCF | Jan 1999 - Feb 2026 |
| Hilcorp Energy Company | New Mexico | 216,642 BBLs | 24,068,860 MCF | Aug 2017 - Mar 2026 |
| Hilcorp Energy Company | Wyoming | 20,465 BBLs | 3,795,033 MCF | Jun 1997 - Mar 2026 |
| Hilcorp Energy Company, Inc. | Alabama | 20,616 BBLs | 155,826 MCF | Oct 1976 - Mar 2026 |
| Hillenburg Oil Co., A General Partnership | Kansas | 2,440 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| HK Eagle LLC | Montana | 1,710 BBLs | 0 MCF | Sep 2025 - Mar 2026 |
| Horton, John | Kansas | 1,454 BBLs | 2 MCF | Jan 1980 - Jan 2026 |
| Howell Oil Company, Inc. | Kansas | 2,791 BBLs | 0 MCF | Jul 1985 - Jan 2026 |
| Hughes Eastern Corporation | Alabama | 2,515 BBLs | 6,137 MCF | Sep 1977 - Mar 2026 |
| Hunt Oil Company | North Dakota | 897,412 BBLs | 689,688 MCF | Aug 1956 - Mar 2026 |
| Huntington Energy LLC | Wyoming | 2,887 BBLs | 1,569 MCF | Dec 2006 - Mar 2026 |
| Huntington Energy, LLC | New Mexico | 281 BBLs | 37,614 MCF | Apr 2003 - Mar 2026 |
| Hyperion Oil & Gas LLC | Wyoming | 6,304 BBLs | 37,913 MCF | Feb 2010 - Mar 2026 |
| Ia Operating, Inc. | Kansas | 7,119 BBLs | 0 MCF | Apr 1997 - Jan 2026 |