Yen Jumps as Japan’s FX Reserves Drop

Japanese yen banknotes on a trading desk illustrating FX reserves shift and yen rebound in currency markets

Key Points

01Yen climbed to about ¥154.06 per dollar on Sept. 7, its strongest since February
02The move followed a prior-week slide that took USD/JPY (USDJPY) near ¥160.39
03Japan’s foreign reserves fell by roughly $80 billion in August to $1.207 trillion
04Authorities spent a record ¥15.4 trillion in August, with year-to-date FX support at ¥27.1 trillion

Yen hits strongest level since February

On Sept. 7, 2026, the Japanese yen appreciated sharply, reaching as much as ¥154.06 against the U.S. dollar. This marked the currency’s strongest level since February and surpassed the peak reached after a previous bout of coordinated intervention by Japanese and U.S. authorities.

The advance represented a clear reversal from trading in the prior week, when the dollar had climbed to about ¥160.39. The turnaround highlighted the ongoing volatility in the yen, which has been sensitive to shifts in policy expectations and official actions in the foreign-exchange market.

Record FX intervention and reserve drawdown

Recent movements in Japan’s foreign reserves underline the scale of official efforts to manage the currency. Finance ministry data show that foreign reserves declined by about $79.6–80.0 billion in August, falling to $1.207 trillion from $1.287 trillion in July. This was described as a record monthly drop for Japan’s reserves.

Authorities confirmed that in the month through Aug. 26 they spent the equivalent of a monthly record ¥15.4 trillion to support the yen. Part of this operation was carried out jointly with the United States, reflecting coordinated action between the two countries in the FX market.

The intervention in August forms part of a much larger effort over the course of the year. Total spending to support the yen so far in 2026 stands at ¥27.1 trillion, the largest yearly intervention amount on record. This has already exceeded the previous annual high of ¥20.4 trillion set in 2003, underscoring the exceptional scale of current measures.

Linking market moves and policy actions

The combination of a stronger yen in early September and a sharp fall in reserves in August highlights the interaction between market forces and official policy. The currency’s recovery to ¥154.06 followed a period of weakness near ¥160.39, during which authorities undertook substantial operations to stabilize the exchange rate.

The record pace of intervention and the associated reserve decline indicate that Japan is deploying significant resources in its efforts to influence yen trading. At the same time, the latest price action shows that the market remains highly reactive, with relatively rapid swings in the exchange rate around key policy and intervention developments.

Key Takeaways

01Japan’s authorities are committing unprecedented sums to FX intervention, with 2026 spending already surpassing the previous full-year record set in 2003.
02The yen’s sharp move from around ¥160 to the mid-¥150s, alongside a record reserve drop, illustrates how quickly market conditions can shift when large-scale operations are underway.
03The decline in reserves to $1.207 trillion leaves Japan with a still substantial buffer, but the magnitude of the monthly drawdown highlights the cost of sustained currency support.

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