Japan's Foreign Reserves Fall Sharply, Suggesting US Treasury Sales to Fund Yen Support

Japan's foreign exchange reserves posted a substantial decline in August, driven by a sharp reduction in foreign securities holdings that strongly suggests authorities liquidated assets to fund the country's record-breaking currency intervention to support the yen.

By the Numbers

Data released Monday by Japan's Ministry of Finance showed the country's official reserve assets fell significantly at the end of August compared to the previous month.

• Total foreign reserves: Fell by $94.6 billion to $995.0 billion.
• Foreign securities holdings: Dropped by $87.8 billion.
• Foreign currency deposits: Decreased by $6.9 billion.

The decline in reserves aligns closely with the ¥15.4 trillion (approximately $98.6 billion) that the ministry previously confirmed it spent on currency market intervention in the month through August 26. This was a record high for a single month, with some operations conducted jointly with the United States.

Treasury Sales Implied

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While the official data does not detail the composition of the securities portfolio, market participants widely estimate that US Treasuries account for the bulk of Japan's holdings. The scale of the securities decline points to outright sales rather than valuation changes, as the price of 10-year US Treasuries fell only slightly during the period, according to the ministry.

This move indicates Japan's willingness to sell its vast holdings of US debt to generate the necessary funds for its currency operations. Such sales are closely watched by global bond markets, particularly as US authorities work to stabilize Treasury yields.

Future Funding Options

Despite the significant drawdown, Japan's remaining reserves of nearly $1 trillion provide substantial resources for potential future interventions if deemed necessary. Furthermore, officials have signaled alternative methods for raising US dollars that would avoid direct sales of Treasuries.

Following the joint intervention, Finance Minister Satsuki Katayama hinted that Japan could utilize the Federal Reserve's FIMA (Foreign and International Monetary Authorities) Repo Facility. This tool would allow Japan to borrow up to $60 billion daily by using its US Treasuries as collateral, providing a less disruptive way to source dollars without putting downward pressure on bond prices.