South Korea’s benchmark KOSPI fell by more than 8% during trading, triggering a 20-minute suspension under the exchange’s circuit-breaker mechanism. Japan’s Nikkei 225 declined by around 5%, extending losses across markets heavily exposed to semiconductor manufacturing, technology hardware and data-centre supply chains.
The regional decline followed a steep fall in US equities on Thursday. The Nasdaq Composite dropped 5.5%, while approximately $3 trillion was wiped from the combined market value of companies in the S&P 500, according to Reuters. The sell-off represented the sharpest decline in US stocks since the market disruption triggered by tariff announcements in 2025.
Investors are reassessing valuations across the AI sector as technology companies continue to commit substantial capital to data centres, advanced chips and computing infrastructure. The scale of spending has supported strong demand for suppliers, but uncertainty remains over how quickly these investments will translate into sustainable earnings and cash flow.
Political developments in the United States have added to the uncertainty. Democrats' gains in the midterm elections, including control of both chambers of Congress, have raised expectations of greater scrutiny of the technology industry. Investors are concerned that potential regulatory measures could affect data-centre expansion, energy consumption and the pace of AI deployment.
Asian markets are particularly exposed because companies in South Korea, Taiwan and Japan play important roles in global semiconductor and technology equipment supply chains. A slowdown in infrastructure spending by major US technology companies could affect orders for chips, memory products, servers and related components.
The sell-off also reflects broader questions about concentration risk in global equity markets. Technology shares have accounted for a substantial share of recent market gains, leaving major indices vulnerable when investor confidence in the sector weakens.
However, the decline does not establish that demand for AI infrastructure is collapsing. Companies may continue investing while facing greater pressure to demonstrate commercial returns and manage capital expenditure more carefully.
Investors will monitor upcoming corporate results, capital expenditure guidance and regulatory signals from Washington for evidence of whether the market correction is temporary or marks a longer reassessment of AI-related valuations. For Asian technology exporters, the key issue will be whether global demand remains strong enough to support current investment and production plans.
