KOSPI surges 18% in biggest single-day rally in South Korean stock market history

After four days of losses, South Korea's KOSPI index surged 17.91% on Friday — the largest single-day gain in the exchange's history. Shares of the biggest memory chip makers shot sharply higher as investors returned to AI-related bets, buoyed by strong results from US big-tech companies. However, retail investors — known locally as "ants" — used the rally as an opportunity to sell rather than buy.

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