Yen Soars on Suspected Japan Intervention, Dollar Drops 2.5%

The yen surged against the U.S. dollar on Thursday in a rapid move that has left markets convinced Japanese authorities intervened to support the weak currency. Dollar/yen fell to as low as 157.8 before trading at 158.61, down 2.5% on the day.

The yen also strengthened sharply against the euro, sterling and the Australian dollar. Currency traders are now focused on whether Tokyo confirms any action.

Why markets suspect intervention

Japan's yen has been trading near 40-year lows against the dollar, weighed down by relatively low Japanese interest rates and the impact of higher energy prices on the country's terms of trade. Japanese officials have repeatedly warned that prolonged currency weakness was increasing the cost of imported energy and adding to inflationary pressures.

Thursday's move came after the dollar had already begun to soften. Market chatter indicates aggressive dollar selling by Japanese and international banks at that point.

What analysts say

Daisaku Ueno, Chief FX Strategist at Mitsubishi UFJ Morgan Stanley Securities in Tokyo, said: "It is difficult to explain a move of nearly five yen in such a short period without intervention. If authorities did intervene, the timing may have been intended to surprise markets."

Ueno added that longer-term appreciation of the yen remains uncertain because expectations of a U.S. rate hike, safe-haven demand for dollars, importer demand and investment-related dollar buying are still supportive of the dollar.

Tom Nakamura, Head of Fixed Income and Currencies at AGF Investments in Toronto, said: "The speed and magnitude of the move strongly suggest intervention, although there is no official confirmation."

Jonas Goltermann, Chief Markets Economist at Capital Economics in London, said: "The scale of the move points toward intervention, though evidence remains indirect. Authorities may have used recent dollar weakness following Federal Reserve communication as an opportunity to change market momentum, similar to intervention episodes seen in 2024."

No official confirmation has been issued by Japanese authorities at the time of writing.