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KOSPI Plunges Over 4% as Tech Giants Samsung and SK Hynix Lead Sell-off

Electronic Technology · Semiconductors · yonhap_finance · 2026-08-06

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The KOSPI index tumbled more than 4% during intraday trading, triggering a sell-side circuit breaker as foreign and institutional investors offloaded shares.

What Happened

KOSPI Plunge and Circuit Breaker: The KOSPI index experienced a sharp decline of over 4% during the session, driven by heavy selling from foreign and institutional investors. The volatility was significant enough to trigger a sell-side circuit breaker, marking the 46th such occurrence this year.

Impact of Semiconductor Weakness: Negative sentiment from the U.S. market, specifically the decline in the Philadelphia Semiconductor Index and disappointing revenue guidance from AMD, weighed heavily on the Korean market. Samsung Electronics and SK Hynix saw significant losses, acting as the primary drivers of the index's downward movement.

Market Liquidity and Sector Performance: Foreign investors net sold approximately 1.84 trillion won in KOSPI stocks, while institutional investors also contributed to the selling pressure. Although individual investors net bought over 1.8 trillion won, the IT and electronics sectors suffered substantial losses, dragging down the broader index.

KOSDAQ Market Overview: The KOSDAQ index also retreated after a five-day winning streak, pressured by selling in the secondary battery sector. Despite the broader market downturn, some robotics-related stocks managed to gain ground following positive news regarding government industrial development plans.

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