Seoul Stocks Surge 17.91%, Shattering Record for Strongest Single-Day Gain on Chip Stock Strength

Price ActionEarnings Impact 4
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Summary · why it matters

South Korea's composite stock index closed up 1,001.89 points, or 17.91%, at 6,595.45, marking the strongest single-day surge in history and shattering the previous record of an 11.95% jump on October 30, 2008. The rally was fueled by strength in semiconductor stocks after Microsoft reported better-than-expected second-quarter 2026 earnings, with both sales and cloud computing growth exceeding forecasts. Samsung Electronics soared 26.81%, SK hynix surged 29.95%, Hanmi Semiconductor jumped 27.98%, and SK Square climbed 29.91%. Automaker and shipbuilder stocks also posted strong gains, with Hyundai Motor up 10.54% and HD Hyundai Heavy Industries rising 7.37%.

Impact on stocks 6

Semiconductors▲ · 2 stocks
SK Hynix Inc
000660
▲ PositiveDemandrelevance

Microsoft's strong earnings and cloud growth signal robust AI demand for memory chips, boosting SK hynix.

Hanmi Semicon
042700
▲ PositiveDemandrelevance

Semiconductor strength from Microsoft's results lifts Hanmi Semiconductor.

Artificial Intelligence▲ · 1 stocks
Information Technology▲ · 1 stocks
SK Square Co Ltd
402340
▲ PositiveDemandrelevance

SK Square surged 29.91% as semiconductor strength driven by Microsoft's strong earnings boosted chip demand.

Electrification & Mobility▲ · 1 stocks
Defense & Geopolitical Fragmentation▲ · 1 stocks
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