Japan's central reserve buffer shrank sharply in August, leaving official foreign reserves at $1.207 trillion after a record $80 billion drop tied to yen support operations. The fall was the steepest monthly decline since official records began in 2000 and marked a fourth consecutive month of declines.
The finance ministry reported a 6.18% slide in August, larger than the previous monthly fall of 5.58% recorded in May. The ministry did not supply an official explanation, but a Japanese media report cited an unnamed finance ministry official who linked the decrease to foreign exchange interventions to buy yen and a drop in the value of government bonds as yields rose.
Market strategists echoed that assessment. Masahiko Loo, senior fixed income strategist at State Street Investment Management, said the decline is primarily the result of Japan's recent dollar-selling, yen-buying FX interventions, and he added the drop reflects policy action rather than signs of financial stress.
Treasury operations over recent months have been sizable. Tokyo bought about 11.73 trillion yen, roughly $75.26 billion, in April and May, then carried out a larger operation of 15.4 trillion yen at the end of July. The combined 27.1 trillion yen expended so far is the largest annual intervention tally on record, topping the previous peak of 20.4 trillion yen in 2003. The late-July move included coordinated action with Washington, when U.S. authorities sold euros to help support the yen, the first such joint intervention with the United States since 1998.
The interventions followed a period of extreme yen weakness, with the currency hitting a 40-year low of 163.98 per dollar on July 23. The yen has since strengthened to about 155.98 against the dollar. Global bond yields have also climbed to multiyear highs over recent weeks, with Germany, the UK and U.S. Treasuries reaching sharp milestones, a backdrop that pushed down bond valuations.
The immediate question for markets is whether Tokyo will continue to draw on its reserves to defend the currency, and how sustained yield moves will affect the value of government securities on the reserve portfolio. Upcoming reserve updates and shifts in global yields will be the next signals of whether the recent trend reverses.
