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#KOSPISurges14% #KOSPISurges14% South Korea's KOSPI staged its sharpest reversal on record Friday, July 31 — surging as much as 14-18% intraday before closing up 17.9% at 6,595.45, its largest one-day gain ever. SK Hynix soared 25-30% (best day on record) and Samsung jumped 20-28%, directly tracking Microsoft and Amazon's blockbuster earnings the night before, which revived confidence that AI infrastructure spending is paying off. This caps a genuinely wild week — KOSPI had sunk 17%+ over the prior three days on AI-bubble fears and rising Chinese chip competition, meaning Friday's rebound recovered nearly all of that loss. One analyst summed it up bluntly: "The Korean stock market has been trading as if it has bipolar disorder." The rally wasn't purely sentiment-driven — Samsung's record quarterly semiconductor operating profit and South Korea's June industrial production rising 2.3% (fastest in six years) added real fundamental support. The government also announced a new 20 trillion won sovereign wealth fund targeting AI, semiconductors, data centers, and infrastructure. The whiplash underscores how tightly Korea's equity market has become tethered to the global AI trade — for better and worse.