KOSPI Opens 7% Down After Hot US CPI and AI Doubts Grow

The Korea Composite Stock Price Index (KOSPI) opened sharply lower on Thursday after hotter US inflation data and AI doubts. South Korea’s benchmark then slid 7.28% to 5,571.27 by 10:13 a.m. Seoul time. The drop extends a six-session losing streak and leaves the index roughly 40% below its June 19 peak. Even so, it remains up 31.87% for 2026, according to TradingView data. What Pushed the KOSPI Into a Trading Halt? US inflation, as measured by the Consumer Price Index (CPI), reached 3.7% in September, the Labor Department reported. Economists had expected 3.6%. Core inflation, which strips out food and energy, also beat forecasts at 2.6%. Meanwhile, US stocks fell on Wednesday as inflation fears and AI skepticism weighed. The S&P 500 lost 1.11% and the Nasdaq Composite dropped 1.88%.

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