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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| GMT Exploration Company LLC | Wyoming | 83 BBLs | 47,578 MCF | Feb 2005 - Oct 2025 |
| Goodale Enterprises LLC | Michigan | 5,027 BBLs | 0 MCF | Jan 1985 - Dec 2025 |
| Gore Oil Company | Kansas | 18,228 BBLs | 1,930 MCF | Jan 1980 - Jun 2025 |
| Grady Bolding Corporation | Kansas | 1,983 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Grand Mesa Operating Co | Colorado | 2,851 BBLs | 260 MCF | Jan 1999 - Sep 2025 |
| Grand Mesa Operating Company | Kansas | 13,544 BBLs | 25,869 MCF | Jan 1980 - Jun 2025 |
| Granite Creek Energy LLC | Wyoming | 19,022 BBLs | 69 MCF | May 2023 - Oct 2025 |
| Grayson Mill Operating, LLC | North Dakota | 2,109,341 BBLs | 9,941,914 MCF | Nov 2021 - Oct 2025 |
| Great American Royalties, Inc. | North Dakota | 1,288 BBLs | 0 MCF | Dec 1979 - Nov 2025 |
| Great Plains Energy, Inc. | Kansas | 1,771 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Green Reserve Energy Holdings LLC | Wyoming | 7,056 BBLs | 706 MCF | Dec 2020 - Oct 2025 |
| Green Valley Operating, LLC | Montana | 3,032 BBLs | 1,977 MCF | Jun 2022 - Sep 2025 |
| Greylock Production, LLC | Utah | 18,536 BBLs | 1,121,126 MCF | Apr 2022 - Oct 2025 |
| Griffin & Griffin Expl, LLC | Louisiana | 2,331 BBLs | 0 MCF | Feb 2007 - Dec 2024 |
| Griffin & Griffin Exploration, LLC | Mississippi | 1,543 BBLs | 0 MCF | May 2000 - Sep 2025 |
| Griffin, Charles N. | Kansas | 13,652 BBLs | 15,289 MCF | Jun 1980 - Jun 2025 |
| GRMR Oil & Gas LLC | Colorado | 1,627 BBLs | 1,878 MCF | Jan 1999 - Sep 2025 |
| Gulf Production Company, Inc. | Louisiana | 1,398 BBLs | 0 MCF | Apr 1992 - Dec 2024 |
| Gunnison Energy LLC | Colorado | 0 BBLs | 226,677 MCF | Jan 1999 - Sep 2025 |
| H & B Petroleum Corp. | Kansas | 8,265 BBLs | 824 MCF | Jan 1980 - Jun 2025 |
| H & C Oil Operating Inc. | Kansas | 4,733 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| H L Brown Operating, LLC | New Mexico | 8,712 BBLs | 25,952 MCF | Jun 2001 - Sep 2025 |
| H R F Antrim LP | Michigan | 0 BBLs | 40,712 MCF | Mar 1989 - Sep 2025 |
| H R F Exploration And Production LLC | Michigan | 0 BBLs | 135,552 MCF | Jan 2006 - Oct 2025 |
| Hadley/Jackson Energy LLC | Wyoming | 1,302 BBLs | 0 MCF | Nov 2019 - Oct 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 |
| Hartman Oil Co., Inc. | Kansas | 20,761 BBLs | 9,209 MCF | Jan 1980 - Jun 2025 |
| Harvard Petroleum Company, LLC | New Mexico | 50,924 BBLs | 200,043 MCF | Jan 1993 - Oct 2025 |
| Harvest Petroleum Partners, LLC | New Mexico | 1,402 BBLs | 1,797 MCF | Mar 2024 - Oct 2025 |
| Hawkins Oil, LLC | Kansas | 1,955 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Hayes Oil & Gas LLC | Kansas | 780 BBLs | 13,951 MCF | Jan 1980 - Jun 2025 |
| Helena Resources Inc | Colorado | 3,016 BBLs | 8,297 MCF | Jan 1999 - Oct 2025 |
| Henergy Oil & Gas LLC | Louisiana | 1,623 BBLs | 0 MCF | Mar 2019 - Jan 2025 |
| Herman L. Loeb, LLC | Kansas | 25,548 BBLs | 119,045 MCF | Jan 1980 - Jun 2025 |
| Hertel Oil Company LLC | Kansas | 2,180 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Hess Bakken Investments II, LLC | North Dakota | 2,903,786 BBLs | 13,202,106 MCF | Jan 2014 - Oct 2025 |
| Hess Oil Company | Kansas | 6,291 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| HG Oil Holdings, LLC | Kansas | 16,139 BBLs | 452 MCF | Jan 2020 - Jun 2025 |
| High River Resources Operating LLC | Colorado | 0 BBLs | 86,820 MCF | Jan 1999 - Sep 2025 |
| High River Resources Operating, LLC | New Mexico | 3,959 BBLs | 445,146 MCF | Nov 2023 - Oct 2025 |
| Highmark Energy Operating LLC | Mississippi | 93,435 BBLs | 1 MCF | Jan 2025 - Sep 2025 |
| Hilcorp Alaska, LLC | Alaska | 2,456,467 BBLs | 30,132,861 MCF | May 2006 - Oct 2025 |
| Hilcorp Energy Company | Colorado | 61 BBLs | 1,777,911 MCF | Jan 1999 - Sep 2025 |
| Hilcorp Energy Company | New Mexico | 168,390 BBLs | 25,169,976 MCF | Aug 2017 - Oct 2025 |
| Hilcorp Energy Company | Wyoming | 22,949 BBLs | 3,663,450 MCF | Jun 1997 - Oct 2025 |
| Hilcorp Energy Company, Inc. | Alabama | 22,909 BBLs | 176,782 MCF | Oct 1976 - Sep 2025 |
| Hilcorp North Slope, LLC | Alaska | 6,050,307 BBLs | 233,498,404 MCF | Jan 2019 - Oct 2025 |
| Hillenburg Oil Co., A General Partnership | Kansas | 1,464 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Howell Oil Company, Inc. | Kansas | 2,439 BBLs | 0 MCF | Jul 1985 - Jun 2025 |