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South Korea’s Samsung SDI to buy out GM’s stake in battery joint venture

By Thomson Reuters Aug 10, 2026 | 11:30 PM

Aug 11 (Reuters) – South Korean battery maker Samsung SDI said on Tuesday it will end its joint venture agreement with General Motors in Indiana and acquire the U.S. firm’s ​49.99% stake, citing weaker-than-expected electric vehicle demand.

Here are some ‌details:

• Samsung SDI said in a regulatory filing that it plans to use the wholly owned unit – SDI-GM Synergy Cells Holdings – to respond to market demand for batteries across various applications, including energy storage systems (ESS) and EVs.

• The ‌company ​said its existing investment plan would change ⁠following the shift to ⁠a wholly owned unit, but specific investment plans had not yet been finalised. The company said it would make further disclosures in accordance with regulatory requirements.

• “The ownership change was made in ​consideration of market changes since the joint venture was announced – including the slower-than-expected growth of EV demand. The two partners ⁠have now decided to seek other forms ⁠of cooperation other than the joint venture,” Samsung ​SDI said in a statement.

• Separately, Samsung SDI said it has signed ​an agreement with GM to jointly develop next-generation prismatic ‌batteries for potential future EV applications.

• Reuters had reported earlier this year that construction at the plant had slowed amid weak demand for EVs.

• GM and other automakers pulled back on EV manufacturing ⁠following the loss of a $7,500 federal tax credit last September. While automakers continue to build and sell EVs, they have lowered factory output ⁠to match demand.

• The ‌joint venture was announced two years ago ⁠and was initially expected to have an annual ​production capacity ‌of 27 gigawatt hours, with an aim to ​start mass ⁠production in 2027.

• In March, GM and LG Energy Solution also announced a decision to transform another EV battery plant in Tennessee to make batteries for ESS.

(Reporting by Anusha Shah in Bengaluru; Joyce Lee and Heekyong Yang in Seoul; Editing by Rashmi Aich, Sonia Cheema ​and Ed Davies)