Japan appears to have financed its record-breaking yen intervention in August by selling US Treasuries and other foreign securities, reigniting concerns about additional supply pressure on an already strained US bond market.
Data from Japan's Ministry of Finance shows foreign securities holdings fell by $87.8 billion at the end of August, a decline that closely aligns with the scale of intervention conducted during the month. The ministry had previously confirmed that authorities deployed approximately ¥15.4 trillion — around $98.6 billion — in currency intervention through August 26, marking the largest monthly total on record, with some operations conducted jointly with the United States.
As a result, Japan's total foreign exchange reserves tumbled by $94.6 billion to $995 billion, breaching the psychologically significant $1 trillion threshold. The sheer size of the intervention and the potential knock-on effects of its financing method on the Treasury market have drawn intense scrutiny from investors and policymakers alike.
Tokyo's apparent move to cash in US debt securities adds a fresh layer of uncertainty for Treasuries, which have already been grappling with supply concerns. In a related development, Treasury Secretary Bessent recently announced plans to double the pace of long-duration bond buybacks over the two months ending November 4, a step widely interpreted as an effort to cap upward pressure on long-end yields and signal Washington's heightened vigilance over market stability.
Foreign Holdings Plunge Points to Treasury Sales
Finance ministry data reveals that foreign securities holdings decreased by $87.8 billion in August, nearly matching the month's intervention spending. While the breakdown of those holdings by instrument type and maturity was not disclosed, market participants generally estimate that roughly 70% of Japan's reserves are invested in US Treasuries.
Price action in the 10-year Treasury suggests valuation changes played only a minimal role in the reduction — the note's price at end-August was only slightly lower than a month earlier. That dynamic lends further weight to the view that Japan actively sold US debt rather than simply experiencing mark-to-market losses.
Record Intervention Marks Deeper US-Japan Coordination
Japan's currency operations during the four weeks through August 26 amounted to approximately ¥15.4 trillion, representing the most aggressive monthly yen-buying campaign ever undertaken. Officials confirmed that a portion of these operations were executed in coordination with US authorities, underscoring a deepening alignment between the two nations on currency policy.
The intervention unfolded against a backdrop of significant downward pressure on the yen, forcing authorities to wade into the market at scale to prop up the domestic currency. The joint nature of the operations points to increased bilateral cooperation on exchange-rate matters, even as Japan taps its Treasury holdings to fund the effort.
Washington's sensitivity to Treasury market conditions has intensified in the run-up to the midterm elections, with Bessent's announcement to double long-bond repurchases viewed as a direct response to rising yield volatility. Tokyo's willingness to liquidate US debt despite this climate suggests that interventional needs remain a higher priority for Japanese policymakers.
Reserves Below Trillion, Yet Firepower Remains
Even with reserves dipping to $995 billion, Japanese officials assess that the remaining stockpile offers sufficient capacity for future intervention if needed. Beyond foreign securities, foreign currency deposits — another potential funding source for market operations — declined by $6.9 billion in August.
Notably, Finance Minister Satsuki Katayama indicated after the joint intervention that future operations could tap the Federal Reserve's Foreign and International Monetary Authorities (FIMA) Repo Facility. That mechanism would allow Japan to access up to $60 billion in daily liquidity without necessitating sales of US Treasuries, thereby limiting any adverse impact on bond yields and extending Tokyo's potential intervention runway.
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