Yen Surges Over 1% After Coordinated US-Japan Intervention

Key Takeaways

• The Japanese yen gained more than 1% against the US dollar, pushing USD/JPY as low as 155.20—its strongest level since early May.
• Japan confirmed that it bought yen in coordination with the US Treasury after the currency previously weakened beyond 163 per dollar.
• Officials from both countries signalled that further intervention remains possible if excessive volatility or disorderly trading returns.

Yen Strengthens to 155.20 Against the Dollar

The Japanese yen rallied sharply on Monday, August 3, after Japan confirmed that it had conducted a coordinated currency intervention with the United States.

The yen advanced by more than 1%, sending USD/JPY down to an intraday low of 155.20. This marked the currency’s strongest level since early May and extended its rebound from the 40-year low recorded near 164 per dollar in late July.

The move also forced some traders to unwind short-yen positions, adding momentum to the currency’s recovery.

Japan and the US Confirm Coordinated Yen Purchases

Japan’s Ministry of Finance said it bought yen on July 31 in coordination with the US Treasury. The operation was intended to counter what officials described as excessive volatility and disorderly movements in the foreign exchange market.

The two governments acted under the framework of a bilateral finance ministers’ statement issued in September 2025. Japan also said it would maintain close communication with Washington and would not hesitate to conduct further joint intervention.

The operation was the first coordinated US-Japan currency intervention since 2011. However, the 2011 action was designed to weaken an excessively strong yen following Japan’s earthquake and tsunami. The latest operation represents the first joint effort to purchase and support the yen in nearly three decades.

Further Intervention Risk Puts Yen Traders on Alert

US Treasury Secretary Scott Bessent expressed support for Japan’s efforts to address the yen’s substantial undervaluation and indicated that Washington could participate in additional coordinated action.

The possibility of repeated intervention could make traders more cautious about rebuilding large short-yen positions. Japan also plans to use the Federal Reserve’s Foreign and International Monetary Authorities Repo Facility, potentially expanding its access to dollar liquidity without immediately selling US Treasury holdings.

Can the Yen Rally Continue?

Although intervention can create rapid exchange-rate movements, the yen’s longer-term direction may still depend on economic fundamentals.

Japan’s relatively low interest rates, uncertainty surrounding fiscal policy and elevated energy-import costs have contributed to sustained selling pressure. Unless interest-rate differentials narrow or confidence in Japan’s fiscal outlook improves, some of that pressure could eventually return.

Markets will therefore monitor whether the Bank of Japan signals further rate increases and whether Japanese and US authorities follow through on their warning of additional intervention. In the near term, the risk of further official action is likely to keep volatility in USD/JPY elevated.