South Korea's KOSPI plunges amid chipmaker sell‑off

On July 16 2026 South Korea’s benchmark KOSPI index tumbled more than 6 percent, slipping from the 7200 level to around 6800. The decline was driven by sharp falls in the country’s two largest semiconductor stocks: Samsung Electronics dropped 8‑9 percent and SK Hynix fell about 11 percent. Foreign investors sold roughly 1.44 trillion won and institutional investors about 1.46 trillion won, prompting the exchange to activate a sell‑sidecar on both the KOSPI and KOSDAQ to pause program‑sell orders. The market swing followed a rally on July 15, when foreign buyers net‑purchased over 2.3 trillion won, lifting the index 6 percent back above 7200. Inverse ETFs linked to the chip stocks saw record turnover, with SK Hynix inverse ETF volume reaching 21 times its float. The downturn was amplified by weakness in U.S. semiconductor shares, cooler‑than‑expected U.S. inflation data, and renewed Middle‑East tensions, which also pressured the Korean won. Regional markets mirrored the move: Japan’s Nikkei fell about 3 percent, while Taiwan’s index slipped modestly. Despite equity losses, Asian bond markets rose on the inflation relief.

The episode highlights the vulnerability of South Korea’s equity market to semiconductor‑sector volatility and to shifts in foreign capital flows.