South Korea's Kospi index sinks more than 7% on semiconductor share sell-off over AI boom worries - Audacy

South Korea's Kospi index fell more than 7% as investors sold off semiconductor shares, with worries about the sustainability of the artificial intelligence boom acting as the trigger. The scale of the move stands out: a single-session decline of that size in a major national benchmark reflects broad risk aversion rather than an isolated reaction to one company's results.

The outsized sensitivity is structural. South Korea's benchmark is heavily weighted toward chipmakers, so when sentiment toward AI-related demand shifts, the index tends to amplify that shift in both directions. A sell-off in semiconductor shares can therefore drag the headline index well beyond the performance of the wider economy.

For observers, the key question is whether this reflects a change in the outlook for AI-related spending or a valuation and positioning reset after a strong run. Watch follow-through across other semiconductor-heavy markets, any company guidance touching AI demand, and whether the decline stabilizes or extends.