AI chip stocks in South Korea and Japan tumble after US semiconductor selloff

The Kospi closed down approximately 5.5% as Samsung, SK Hynix and Kioxia followed Wall Street's chip slide lower Wall Street’s chip stocks had a bad day. On October 13, 2026, Asia inherited the hangover. AI-related shares in South Korea and Japan slid sharply after US semiconductor names sold off in the prior session. South Korea’s Kospi fell as much as 7% intraday before closing down approximately 5.5%. The damage in Korea was concentrated in exactly the place you would expect: memory chips. Samsung Electronics and SK Hynix both fell by around 7-10% during the session.

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