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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Green Reserve Energy Holdings LLC | Wyoming | 7,332 BBLs | 431 MCF | Dec 2020 - Feb 2026 |
| Green Valley Operating, LLC | Montana | 2,063 BBLs | 1,100 MCF | Jun 2022 - Jan 2026 |
| Greenwood Resources L.L.C. | Kansas | 1,177 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| Greylock Production, LLC | Utah | 17,417 BBLs | 1,130,437 MCF | Apr 2022 - Jan 2026 |
| Griffin & Griffin Expl, LLC | Louisiana | 2,331 BBLs | 0 MCF | Feb 2007 - Dec 2024 |
| Griffin & Griffin Exploration LLC | Mississippi | 1,535 BBLs | 0 MCF | May 2000 - Jan 2026 |
| Griffin, Charles N. | Kansas | 10,838 BBLs | 6,634 MCF | Jun 1980 - Nov 2025 |
| Gulf Production Company, Inc. | Louisiana | 1,398 BBLs | 0 MCF | Apr 1992 - Dec 2024 |
| H & B Petroleum Corp. | Kansas | 8,044 BBLs | 802 MCF | Jan 1980 - Nov 2025 |
| H & C Oil Operating Inc. | Kansas | 5,232 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| H & D Exploration LLC | Kansas | 1,943 BBLs | 3,041 MCF | May 1983 - Nov 2025 |
| H R F Antrim LP | Michigan | 0 BBLs | 40,712 MCF | Mar 1989 - Aug 2025 |
| H R F Exploration And Production LLC | Michigan | 0 BBLs | 135,552 MCF | Jan 2006 - Sep 2025 |
| Hadley/Jackson Energy LLC | Wyoming | 1,180 BBLs | 0 MCF | Nov 2019 - Jan 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 | 19,708 BBLs | 6,448 MCF | Jan 1980 - Nov 2025 |
| Harvard Petroleum Company, LLC | New Mexico | 46,673 BBLs | 161,140 MCF | Jan 1993 - Jan 2026 |
| Harvest Petroleum Partners, LLC | New Mexico | 974 BBLs | 1,358 MCF | Mar 2024 - Jan 2026 |
| Hawkins Oil, LLC | Kansas | 1,117 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| Hawley & Desimon | Montana | 1,174 BBLs | 0 MCF | Jan 1991 - Feb 2026 |
| Hayes Oil & Gas LLC | Kansas | 1,252 BBLs | 10,253 MCF | Jan 1980 - Nov 2025 |
| Helena Resources Inc | Colorado | 1,496 BBLs | 6,970 MCF | Jan 1999 - Jan 2026 |
| Henergy Oil & Gas LLC | Louisiana | 1,623 BBLs | 0 MCF | Mar 2019 - Jan 2025 |
| Herman L. Loeb, LLC | Kansas | 23,041 BBLs | 115,930 MCF | Jan 1980 - Nov 2025 |
| Hertel Oil Company LLC | Kansas | 1,259 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| Hess Bakken Investments II, LLC | North Dakota | 2,813,617 BBLs | 11,655,544 MCF | Jan 2014 - Feb 2026 |
| Hess Oil Company | Kansas | 6,471 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| HG Oil Holdings, LLC | Kansas | 20,391 BBLs | 3,477 MCF | Jan 2020 - Nov 2025 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 84,823 MCF | Jan 1999 - Jan 2026 |
| Highmark Energy Operating, LLC | Mississippi | 29,899 BBLs | 0 MCF | Jan 2025 - Jan 2026 |
| Hilcorp Alaska, LLC | Alaska | 8,984,404 BBLs | 316,685,159 MCF | May 2006 - Feb 2026 |
| Hilcorp Energy Company | Colorado | 114 BBLs | 2,000,188 MCF | Jan 1999 - Jan 2026 |
| Hilcorp Energy Company | New Mexico | 200,940 BBLs | 24,010,527 MCF | Aug 2017 - Jan 2026 |
| Hilcorp Energy Company | Wyoming | 19,302 BBLs | 3,925,235 MCF | Jun 1997 - Jan 2026 |
| Hilcorp Energy Company, Inc. | Alabama | 21,397 BBLs | 163,078 MCF | Oct 1976 - Dec 2025 |
| Hillenburg Oil Co., A General Partnership | Kansas | 1,910 BBLs | 0 MCF | Jan 1980 - Nov 2025 |
| Howell Oil Company, Inc. | Kansas | 2,783 BBLs | 0 MCF | Jul 1985 - Nov 2025 |
| Hughes Eastern Corporation | Alabama | 2,123 BBLs | 6,936 MCF | Sep 1977 - Dec 2025 |
| Hunt Oil Company | North Dakota | 657,100 BBLs | 502,813 MCF | Aug 1956 - Feb 2026 |
| Huntington Energy LLC | Wyoming | 2,899 BBLs | 1,904 MCF | Dec 2006 - Jan 2026 |
| Huntington Energy, LLC | New Mexico | 0 BBLs | 43,235 MCF | Apr 2003 - Jan 2026 |
| Hyperion Oil & Gas LLC | Wyoming | 5,816 BBLs | 44,649 MCF | Feb 2010 - Jan 2026 |
| Ia Operating, Inc. | Kansas | 6,475 BBLs | 0 MCF | Apr 1997 - Nov 2025 |
| Iacx Production LLC | New Mexico | 46 BBLs | 290,961 MCF | Apr 2020 - Jan 2026 |
| Impact Energy Operating LLC | Wyoming | 20,813 BBLs | 0 MCF | Aug 2022 - Jan 2026 |
| Impetro Resources LLC | Colorado | 16,443 BBLs | 424 MCF | Jan 1999 - Jan 2026 |
| Indian Exploration, Inc. | Louisiana | 1,621 BBLs | 0 MCF | Feb 1992 - Jan 2025 |
| Indian Oil Co., Inc. | Kansas | 5,436 BBLs | 36,406 MCF | Jan 1980 - Nov 2025 |
| Investment Equipment LLC | Colorado | 1,513 BBLs | 295 MCF | Jan 1999 - Jan 2026 |