SK Hynix Stock Plunges 11%, Triggering Kospi Circuit Breaker

3-line summary

• SK Hynix shares fell 11.1% to 1,262,000 won on Thursday, one of its biggest one-day drops in months, per Investing.com. The Kospi opened roughly 5.6% lower, triggering a sell-side circuit breaker on both the Kospi and Kosdaq; Samsung Electronics also fell sharply, and Japan's Nikkei and Asian chip-equipment makers dropped in sympathy with the broader tech selloff.
• Cited catalysts: September US CPI came in above forecast, raising rate-hike fears that lift the cost of capital underpinning AI-infrastructure spending (the basis of HBM chip demand); Broadcom and Intel's CEOs separately warned that financing, not chip supply or power, could become AI expansion's biggest bottleneck, spreading selling across the memory supply chain; concerns persisted that China's CXMT could commercialize denser 4F²-based server DRAM by year-end, pressuring SK Hynix's pricing power and market share; and foreign investors sold Korean chip stocks aggressively over several sessions, with SK Hynix net outflows reaching hundreds of billions of won.

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