Kospi Plunges 5.6% on U.S. Inflation and AI Profitability Fears

On Oct. 15 the Kospi opened at 5,673.01, down 5.59% from its previous close of 6,008.81. Samsung Electronics fell over 7% and SK hynix about 9%, triggering sell-side sidecars in both markets. The selloff followed U.S. September CPI of 3.7% and growing doubts over AI infrastructure returns.

• Kospi fell as low as 5,615.72, down more than 5% in morning trade
• Samsung Electronics dropped 7%, SK hynix slid 9%
• Philadelphia Semiconductor Index fell 4.30%, its sixth straight losing session
• Foreign investors sold over 900 billion won of Kospi shares in the morning