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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Conocophillips Alaska, Inc. | Alaska | 4,094,488 BBLs | 11,251,453 MCF | Dec 1963 - Jan 2026 |
| Conocophillips Company | New Mexico | 943,916 BBLs | 3,396,082 MCF | Jan 2003 - Dec 2025 |
| Contango Resources LLC | Wyoming | 394,654 BBLs | 8,906,743 MCF | Feb 2020 - Dec 2025 |
| Contango Resources, Inc. | Montana | 19,064 BBLs | 78,462 MCF | Dec 2020 - Jan 2026 |
| Continental Resources Inc | Montana | 179,295 BBLs | 305,757 MCF | Jan 1991 - Dec 2025 |
| Continental Resources Inc | Wyoming | 786,220 BBLs | 2,767,120 MCF | Jan 1993 - Dec 2025 |
| Continental Resources, Inc. | North Dakota | 5,638,362 BBLs | 20,525,150 MCF | Sep 1978 - Dec 2025 |
| Cook Inlet Energy, LLC. | Alaska | 97,317 BBLs | 43,866 MCF | Dec 2009 - Jan 2026 |
| Coral Production Corporation | Kansas | 2,701 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Core Antrim Company LLC | Michigan | 0 BBLs | 63,335 MCF | Jul 2025 - Dec 2025 |
| Core Energy LLC | Michigan | 30,811 BBLs | 8,647 MCF | Jan 2006 - Dec 2025 |
| Cornerstone Natural Resources LLC | North Dakota | 6,827 BBLs | 9,299 MCF | Jan 2007 - Jan 2026 |
| Coteau Energy LLC | Louisiana | 11,100 BBLs | 72,787 MCF | Aug 2021 - Dec 2024 |
| Coterra Energy Operating Co. | New Mexico | 1,732,349 BBLs | 7,836,383 MCF | Oct 2002 - Dec 2025 |
| Coterra Energy Operating E LLC | New Mexico | 272,862 BBLs | 383,091 MCF | Jan 2023 - Dec 2025 |
| Coterra Energy Operating F LLC | New Mexico | 953,417 BBLs | 3,943,369 MCF | Apr 2019 - Dec 2025 |
| Crawford Production Company | Kansas | 2,155 BBLs | 705 MCF | Jan 1980 - Sep 2025 |
| Creole Operating, LLC | Louisiana | 1,922 BBLs | 11,244 MCF | May 2020 - Dec 2024 |
| Crescent Energy Operating, LLC | Utah | 508,054 BBLs | 2,330,872 MCF | Sep 2025 - Dec 2025 |
| Crescent Pass Energy, LLC | Louisiana | 100 BBLs | 90,211 MCF | Aug 2018 - Jan 2025 |
| Crestone Peak Resources Operating LLC | Colorado | 1,075,459 BBLs | 6,179,069 MCF | Jan 1999 - Nov 2025 |
| Crosbys Creek Oil & Gas, LLC | Alabama | 5,867 BBLs | 44,023 MCF | Apr 1982 - Dec 2025 |
| Cross Bar Energy, LLC | Kansas | 2,889 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Cross Timbers Energy, LLC | New Mexico | 27,334 BBLs | 381,577 MCF | Jul 2013 - Dec 2025 |
| Crowheart Energy LLC | Wyoming | 247,025 BBLs | 8,325,151 MCF | Feb 2018 - Nov 2025 |
| Crown Energy Company | Kansas | 1,773 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Cumberland Operating LLC | Wyoming | 216 BBLs | 12,641 MCF | Oct 2015 - Dec 2025 |
| Curt'S Oil Operation, LLC | Kansas | 3,628 BBLs | 2,019 MCF | Jan 2010 - Sep 2025 |
| Dale E. Jackson Production Co. | Kansas | 1,949 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Darrah Oil Company, LLC | Kansas | 16,969 BBLs | 6,489 MCF | Jan 2010 - Sep 2025 |
| Daube Company The | Wyoming | 7,331 BBLs | 450 MCF | Jan 1990 - Nov 2025 |
| Daylight Petroleum LLC | Louisiana | 6,709 BBLs | 21,077 MCF | Feb 2019 - Dec 2024 |
| Daystar Petroleum, Inc. | Kansas | 10,551 BBLs | 14,643 MCF | Jan 1980 - Sep 2025 |
| De Soto Oil Properties, LLC | Alabama | 1,796 BBLs | 1,578 MCF | May 1988 - Dec 2025 |
| Delta Royalties LLC | Louisiana | 2,739 BBLs | 7,275 MCF | Nov 2019 - Dec 2024 |
| Denbury Onshore, LLC | Alabama | 20,178 BBLs | 0 MCF | Jan 1956 - Dec 2025 |
| Denbury Onshore, LLC | Louisiana | 76,063 BBLs | 69,845 MCF | Jan 2004 - Dec 2024 |
| Denbury Onshore, LLC | Mississippi | 4,269 BBLs | 0 MCF | Jun 1971 - Nov 2025 |
| Denbury Onshore, LLC | Montana | 275,466 BBLs | 6,129,934 MCF | Jan 2011 - Dec 2025 |
| Denbury Onshore, LLC | North Dakota | 100,426 BBLs | 16,522 MCF | Oct 2007 - Dec 2025 |
| Desert Eagle Operating LLC | Colorado | 0 BBLs | 42,639 MCF | Apr 2022 - Dec 2025 |
| Deutsch Oil Company | Kansas | 3,240 BBLs | 532 MCF | Jan 1980 - Sep 2025 |
| Devon Energy Production Company LP | Wyoming | 715,660 BBLs | 1,213,454 MCF | Jan 1978 - Dec 2025 |
| Devon Energy Production Company, LP | New Mexico | 7,023,113 BBLs | 34,942,003 MCF | Jan 1993 - Dec 2025 |
| Devon Energy Williston, L.L.C | North Dakota | 2,985,897 BBLs | 13,015,137 MCF | Sep 2025 - Dec 2025 |
| Devon Energy Williston, L.L.C. | Montana | 114,197 BBLs | 119,124 MCF | Apr 2021 - Dec 2025 |
| DGH Oil, LLC | Kansas | 4,619 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Diamond Oil & Gas LLC | Wyoming | 797 BBLs | 12,724 MCF | Oct 2011 - Dec 2025 |
| Diehl Oil Inc | Kansas | 2,085 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Diversified Production LLC | Louisiana | 8,836 BBLs | 3,242,940 MCF | May 2021 - Dec 2024 |