KOSPI falls 5.54%; SK Hynix (000660.KS) drops 9.92% in AI-chip rotation

KOSPI’s 5.54% drop on June 5 clears the Korean Tier-1 index threshold and puts the market move beyond a routine daily recap. CNBC market data showed the benchmark closing at 8,160.59, with the small-cap KOSDAQ down 4.50%. The catalyst was a regional spillover from Wall Street’s rotation out of AI-linked chip names after Broadcom’s revenue miss.

The single-stock damage was concentrated in Korea’s semiconductor leaders. Samsung Electronics (005930.KS) fell 6.40%, while SK Hynix (000660.KS) dropped 9.92%. Those two stocks carry index weight and direct exposure to the AI memory and semiconductor supply chain, so the move translated from a U.S. chip valuation reset into Korean benchmark pressure.

The external setup added to the move. CNBC reported the Dow Jones Industrial Average rose 874.86 points, or 1.73%, to a record 51,561.93, while the Nasdaq Composite lost 0.09% as investors shifted away from chip exposure. The same report said Broadcom fell more than 12%, the VanEck Semiconductor ETF lost more than 1%, Arm Holdings declined more than 4%, and Micron fell close to 8%.

The local policy angle is also worth tracking. CNBC cited South Korea’s labor minister urging major technology companies to share more of AI semiconductor gains with workers and suppliers, adding a domestic distribution question to the global valuation reset. The next watchpoints are KRX foreign-flow data, won-dollar movement, and whether SK Hynix’s nearly 10% drawdown stabilizes with U.S. semiconductor futures.