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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Cody Operating, Inc. | Mississippi | 963 BBLs | 65,123 MCF | Dec 1976 - Aug 2025 |
| COG Operating LLC | New Mexico | 3,474,151 BBLs | 15,005,860 MCF | Dec 2004 - Aug 2025 |
| COG Production, LLC | New Mexico | 525,043 BBLs | 2,719,649 MCF | Jul 2004 - Aug 2025 |
| Colt Energy Inc | Kansas | 15,693 BBLs | 50,641 MCF | Jan 1980 - Jun 2025 |
| Compass Energy Operating, LLC | Louisiana | 138 BBLs | 869,300 MCF | Jul 2014 - Jan 2025 |
| Comstock Oil & Gas--La, LLC | Louisiana | 690 BBLs | 39,125,046 MCF | Apr 2005 - Dec 2024 |
| Conocophillips Alaska, Inc. | Alaska | 3,537,071 BBLs | 7,821,459 MCF | Dec 1963 - Sep 2025 |
| Conocophillips Company | New Mexico | 696,978 BBLs | 3,132,144 MCF | Jan 2003 - Aug 2025 |
| Contango Resources LLC | Wyoming | 407,054 BBLs | 7,184,665 MCF | Feb 2020 - Sep 2025 |
| Contango Resources, Inc. | Montana | 20,732 BBLs | 86,536 MCF | Dec 2020 - Sep 2025 |
| Continental Resources Inc | Montana | 238,376 BBLs | 359,754 MCF | Jan 1991 - Aug 2025 |
| Continental Resources Inc | Wyoming | 1,033,562 BBLs | 2,942,987 MCF | Jan 1993 - Aug 2025 |
| Continental Resources, Inc. | North Dakota | 6,442,948 BBLs | 20,946,030 MCF | Sep 1978 - Aug 2025 |
| Cook Inlet Energy, LLC. | Alaska | 105,268 BBLs | 36,404 MCF | Dec 2009 - Sep 2025 |
| Coral Production Corporation | Kansas | 2,398 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Core Antrim Company LLC | Michigan | 0 BBLs | 65,995 MCF | Jul 2025 - Aug 2025 |
| Core Energy LLC | Michigan | 29,510 BBLs | 8,671 MCF | Jan 2006 - Aug 2025 |
| Cornerstone Natural Resources LLC | North Dakota | 8,224 BBLs | 11,853 MCF | Jan 2007 - Sep 2025 |
| Coteau Energy LLC | Louisiana | 11,100 BBLs | 72,787 MCF | Aug 2021 - Dec 2024 |
| Coterra Energy Operating Co. | New Mexico | 1,461,271 BBLs | 7,702,539 MCF | Oct 2002 - Aug 2025 |
| Coterra Energy Operating E LLC | New Mexico | 334,775 BBLs | 462,805 MCF | Jan 2023 - Aug 2025 |
| Coterra Energy Operating F LLC | New Mexico | 1,153,328 BBLs | 4,080,129 MCF | Apr 2019 - Aug 2025 |
| Crawford Production Company | Kansas | 1,336 BBLs | 721 MCF | Jan 1980 - Jun 2025 |
| Creole Operating, LLC | Louisiana | 1,922 BBLs | 11,244 MCF | May 2020 - Dec 2024 |
| Crescent Pass Energy, LLC | Louisiana | 100 BBLs | 90,211 MCF | Aug 2018 - Jan 2025 |
| Crestone Peak Resources Operating LLC | Colorado | 1,443,881 BBLs | 6,667,289 MCF | Jan 1999 - Aug 2025 |
| Crosbys Creek Oil & Gas, LLC | Alabama | 5,408 BBLs | 37,953 MCF | Apr 1982 - Jul 2025 |
| Cross Bar Energy, LLC | Kansas | 2,273 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Cross Timbers Energy, LLC | New Mexico | 27,886 BBLs | 401,904 MCF | Jul 2013 - Aug 2025 |
| Crowheart Energy LLC | Wyoming | 218,048 BBLs | 8,529,361 MCF | Feb 2018 - Aug 2025 |
| Crown Energy Company | Kansas | 2,315 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Curt'S Oil Operation, LLC | Kansas | 4,627 BBLs | 2,475 MCF | Jan 2010 - Jun 2025 |
| CWT Operating, LLC | Montana | 1,450 BBLs | 109 MCF | Dec 2021 - Aug 2025 |
| Dakota Crude, Inc. | North Dakota | 1,242 BBLs | 0 MCF | May 2003 - Sep 2025 |
| Dale E. Jackson Production Co. | Kansas | 1,960 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Darrah Oil Company, LLC | Kansas | 16,783 BBLs | 7,084 MCF | Jan 2010 - Jun 2025 |
| Daube Company The | Wyoming | 7,781 BBLs | 450 MCF | Jan 1990 - Aug 2025 |
| Daylight Petroleum LLC | Louisiana | 6,709 BBLs | 21,077 MCF | Feb 2019 - Dec 2024 |
| Daystar Petroleum, Inc. | Kansas | 11,240 BBLs | 14,356 MCF | Jan 1980 - Jun 2025 |
| De Soto Oil Properties, LLC | Alabama | 1,467 BBLs | 828 MCF | May 1988 - Jul 2025 |
| Delta Royalties LLC | Louisiana | 2,739 BBLs | 7,275 MCF | Nov 2019 - Dec 2024 |
| Denbury Onshore, LLC | Alabama | 20,188 BBLs | 0 MCF | Jan 1956 - Jun 2025 |
| Denbury Onshore, LLC | Louisiana | 76,063 BBLs | 69,845 MCF | Jan 2004 - Dec 2024 |
| Denbury Onshore, LLC | Montana | 277,980 BBLs | 5,800,131 MCF | Jan 2011 - Aug 2025 |
| Denbury Onshore, LLC | North Dakota | 101,219 BBLs | 20,565 MCF | Oct 2007 - Aug 2025 |
| Desert Eagle Operating LLC | Colorado | 0 BBLs | 50,072 MCF | Apr 2022 - Aug 2025 |
| Deutsch Oil Company | Kansas | 3,496 BBLs | 988 MCF | Jan 1980 - Jun 2025 |
| Devon Energy Production Company LP | Wyoming | 655,330 BBLs | 1,148,567 MCF | Jan 1978 - Sep 2025 |
| Devon Energy Production Company, LP | New Mexico | 6,620,715 BBLs | 34,029,589 MCF | Jan 1993 - Aug 2025 |
| Devon Energy Williston, L.L.C. | Montana | 165,332 BBLs | 142,847 MCF | Apr 2021 - Aug 2025 |