The Nikkei 225 index closed down 2,563 points [1] on Monday, marking the fifth-largest one-day decline in the index's history [1].

The crash highlights the vulnerability of the Tokyo market to U.S. monetary policy and the volatility of the high-growth technology sectors that have recently driven Japanese equities higher.

Market volatility peaked during the trading session when the index fell more than 3,100 points intraday [1]. The final closing drop of over 2,500 points [2] reflects a sharp reversal in investor sentiment following the weekend.

Analysts said the sell-off is due to strengthening expectations that the United States will raise interest rates. This outlook pressured stocks related to artificial intelligence and semiconductors, which had previously been the primary drivers of market gains [1].

These technology-heavy sectors are particularly sensitive to interest rate changes, as higher rates often increase borrowing costs and reduce the present value of future earnings for growth companies. The synchronized decline in semiconductor-related shares dragged the broader market down during the first trading day of the week [1].

The scale of the decline underscores a significant shift in risk appetite among traders in Tokyo. By closing with a loss of 2,563 points [1], the Nikkei 225 has entered a period of extreme instability as investors react to the potential for tighter U.S. financial conditions.

The Nikkei 225 closed down 2,563 points

This crash demonstrates the deep integration of the Tokyo Stock Exchange with U.S. macroeconomic trends. Because the recent rally in Japanese stocks was heavily concentrated in AI and semiconductor firms, any signal of rising U.S. interest rates can trigger a disproportionate sell-off in those specific sectors, creating a domino effect across the entire Nikkei 225.