South Korea's KOSPI index has surged roughly 200% year-on-year as Samsung and SK Hynix ride the AI chip boom, but concentration risk looms large.

South Korea's KOSPI index plunged nearly 10% as SK Hynix and Samsung sell-off triggers circuit breakers, raising doubts about AI-driven stock valuations.

Samsung and SK Hynix led a 4% KOSPI rally on June 25 after Micron’s record quarter and outlook revived optimism on AI memory demand.

South Korea's KOSPI index doubled in 2026, driven by retail investors betting on Samsung and SK Hynix. But concentration risk and AI chip demand concerns

KOSPI plunged over 8% as Samsung and SK Hynix led a broad chipmaker selloff. Foreign investors sold $2.6 billion in shares amid shifting AI sentiment.

South Korea's KOSPI index has surged roughly 200% year-on-year as Samsung and SK Hynix ride the AI chip boom, but concentration risk looms large.

Heavyweights Samsung Electronics and SK Hynix, which together account for more than half of Kospi's market cap, fell around 9% each on Friday, forcing the exchange to trigger…

South Korea's Kospi index faces extreme volatility, with sharp gains and losses driven by the global AI boom, highlighting rapid shifts between investor euphoria and panic.