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Asian Shares Drop, with South Korea's Kospi Down More than 5%
The exchange moved to limit disorderly selling after AI-related shares slid, with SK Hynix down 8.4% and Samsung Electronics off 5.4%, traders said.
On Friday, June 5, 2026, the Korea Exchange activated a sell-side sidecar for the Korea Composite Stock Price Index as the index plummeted 5.1% by midday, triggering a five-minute program trading suspension.
Following a retreat in U.S. markets where Broadcom sank 12.6% on missed forecasts, investors dumped AI-related shares, causing South Korea's SK Hynix to plunge 8.4% and Samsung Electronics to shed 5.4%.
Markets across Asia also declined, with Japan's Nikkei slipping 1.4% to 66,532.35 and Hong Kong's Hang Seng falling 0.8% to 25,047.83, reflecting broader uncertainty over the Strait of Hormuz.
ING strategists Warren Patterson and Ewa Manthey noted that hopes for a U.S.-Iran deal may be "overly optimistic." Oil prices stabilized after falling Thursday, though the energy shock continues threatening economic growth.
Despite the sell-off, the KOSPI has roughly doubled in the past year, lifted by gains for big tech companies. Analysts question whether the AI-driven market surge can sustain these record-breaking heights.