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South Korea's Kospi Index Sinks More than 7% on Semiconductor Share Sell-Off over AI Boom Worries
Foreign investors sold 2.3 trillion won as worries over AI valuations and chip competition deepened, while Samsung Electronics and SK hynix led losses.
On Tuesday, Oct. 13, 2026, South Korea's KOSPI and KOSDAQ plummeted, with the Korea Exchange activating a sell-side sidecar as KOSPI dropped 7.4% to 5,914.35, its lowest level since late July.
Investors sold off semiconductor shares amid concerns over rising competition from China and AI valuations, following a mixed U.S. session where the Nasdaq Composite fell 0.44% and the Dow Jones Industrial Average rose 0.38%.
Market behemoth Samsung Electronics plunged 7.29% and SK Hynix declined 8.35%, while Hanwha Aerospace dropped 5.34% and Hyundai Motor shed 5.78% in the widespread selloff.
Foreigners sold a net 2.3 trillion won worth of stocks, though institutions and individuals bought a net 808.9 billion won and 1.27 trillion won respectively.
Broader Asian markets also declined, with Japan's Nikkei 225 dropping 2.5% and chip equipment maker Tokyo Electron falling 6.6% in regional trading.