Japan's $98.6B Yen Defense May Shift to Fed Repo Facility

Tokyo's biggest-ever currency intervention drained $87.8 billion from its holdings of foreign securities last month, and the funding method behind that record defense of the yen may now be about to change.

The Ministry of Finance confirmed it deployed ¥15.4 trillion, about $98.6 billion, in the month through Aug. 26, with part of the operation run jointly with the United States. Reserve data released Monday show foreign securities holdings fell $87.8 billion at the end of August, a drop closely matching that spending. Finance Minister Satsuki Katayama suggested after the joint operation that future interventions could tap the Federal Reserve's Foreign and International Monetary Authorities Repo Facility, which lets Japan raise as much as $60 billion a day against Treasury collateral without selling the bonds.

The data do not break down securities by issuer or maturity, but market participants estimate roughly 70 percent of Japan's foreign reserves sit in US Treasuries. Because 10-year Treasury prices barely moved between July and August, valuation changes accounted for little of the $87.8 billion decline, pointing to outright sales that add supply pressure to a market the Trump administration is working to stabilize ahead of the Nov. 4 midterm elections.

Treasury Secretary Scott Bessent recently said the government would double its buybacks of longer-dated debt for two months through Nov. 4, a step widely read as an effort to keep a lid on long-end yields. Japan's willingness to keep selling Treasuries even as Washington grows more sensitive to market stability sets up a test of whether deepening bilateral coordination on exchange rates extends to the funding of future interventions.

Japan's total foreign reserves fell $94.6 billion to $995 billion at the end of August, dropping below the $1 trillion threshold for the first time and marking the largest monthly decline on record. The drop exceeded both in amount and percentage the $77.1 billion decline, or 5.6 percent, recorded at the end of May, which reflected yen-buying interventions in April and May and had been the largest on record at the time. Foreign currency deposits, another potential source of intervention funds, fell $6.9 billion.

The drawdown still leaves substantial resources, and the FIMA Repo option would expand Tokyo's capacity without the market impact of outright Treasury sales. The intervention, totaling ¥15.4 trillion through Aug. 26, dwarfed the ¥11.7 trillion Tokyo deployed in April and May. Part of the latest operation was conducted jointly with the United States, a rare step that shows how far the two governments have moved toward coordinated currency management as the yen came under sustained pressure.

If Japan shifts to the repo facility, the immediate supply overhang from its Treasury sales would ease, giving Bessent's buyback program more room to work. If it keeps selling, the doubling of buybacks through Nov. 4 becomes the key counterweight absorbing that flow. Either path leaves the US bond market's supply-demand balance — and how aggressively Washington defends it before the midterms — the variable to watch.

This article is for informational purposes only and does not constitute investment advice.