China National Offshore Oil Corp. (CNOOC) has surrendered its 21% interest in the Appomattox (Mississippi Canyon 391, 392, and 393) project and its 25% stake in Stampede (Green Canyon 468, 511, and 512). Those ownership positions were acquired in CNOOC’s takeover of Calgary-based Nexen in 2013.
CNOOC had been quite positive about the prospects for Appomattox and Stampede, which are producing at higher than expected rates. However, because of sanctions concerns, an exit from operations in the US, Canada, and the UK had been under consideration for at least 2 years.
CNOOC’s shares of Appomattox and Stampede were acquired by INEOS Energy, a UK company.
The transaction is also discussed in CNOOC’s 2024 Annual Report (p.19).
Bud's Offshore Energy (BOE) 
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