KOSPI Plunges 9.99% as AI Stock Stress Deepens

South Korea's KOSPI index plunged 9.99% on June 23, 2026, triggering a circuit breaker. Samsung Electronics and SK Hynix contributed approximately 71% of the decline. The decline was linked to slowed SK Hynix HBM4 expansion, profit-taking before Micron's earnings report, and regulatory warnings on leveraged ETFs. Bank of America's bubble indicator showed the Nasdaq 100 approaching a 0.8 threshold.
NAS100-0.15%
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