Citi Forecasts USD/JPY at 163 if Topix Stock Index Hits 4,500

The Japanese yen could weaken to ¥163 per U.S. dollar if the country's broad Topix stock index surges to the 4,500 level, according to a new forecast from Citi. The bank's analysis suggests a powerful rally in Japanese equities could exert significant downward pressure on the currency.

The Stock-Currency Link

In a research note released Thursday, Citi analysts stated that their current model, based on the Topix index, already implies a USD/JPY rate of approximately ¥160. Historically, strong performance in Japanese stocks has often led to a weaker yen.

This dynamic occurs as portfolio rebalancing and hedging activities by both domestic and international investors intensify during equity bull markets, a process that has previously amplified yen depreciation, the note explained.

A Shifting Correlation

However, Citi observed that the traditionally strong correlation between rising equities and a falling yen has become less pronounced since 2024. The firm attributed this shift to two key developments:

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• A narrowing of the monetary policy gap between the Bank of Japan and other major central banks.
• Direct foreign exchange intervention by Japanese authorities to purchase and support the yen.

Outlook and Risks

The bank cautioned that the current USD/JPY exchange rate already prices in some of the ongoing strength in the Japanese stock market. Still, analysts warned that risks of further yen weakness persist.

Potential catalysts for additional depreciation include a significant change in the interest rate spread or a shift in the Japanese government's policy on currency intervention. Citing these uncertainties, Citi recommended that investors continue to exercise caution when trading the currency pair.