Bank of Japan likely intervened in FX trading yesterday, a day before it held interest rates steady.

💴 Yen stages a suspiciously sharp rally

  • The climbed back above ¥160.00 Friday after collapsing from beyond ¥163.00 to around ¥157.00 Thursday. That’s 600 pips and it was one of the yen’s biggest one-day rallies in recent years.
  • No obvious market catalyst explained the sudden vertical move. But traders had watched Japanese officials as the yen crossed ¥163 per dollar for the first time in 40 years.
  • Japan’s finance ministry directs currency intervention, typically using the Bank of Japan to execute the trades.
  • Authorities likely bought yen and sold dollars during New York trading, although official confirmation may arrive later through the government’s transaction data.

🚨 Above ¥160, intervention alarms ring

  • Levels beyond ¥160 had become increasingly intervention-prone, with analysts viewing roughly ¥162 to ¥165 as Tokyo’s danger zone.
  • Finance Minister Satsuki Katayama warned last week that authorities stood ready to take “appropriate and bold action.” Thursday certainly covered the bold part.
  • The timing was unusually convenient. Without intervention, an unchanged BOJ rate could have pushed the dollar toward ¥165 as traders punished Japan’s reluctance to tighten policy.
  • Tokyo effectively applied the brakes (unconfirmed, though) before announcing it would leave the engine running at the same speed.
  • Japan previously spent more than $70 billion supporting the yen through interventions in April and May. Those efforts produced spectacular short-term rallies but little lasting strength.

🏦 BOJ holds, but inflation heats up

  • The Bank of Japan kept its policy rate at 1% in an 8–1 vote. Board member Hajime Takata dissented, proposing an increase to 1.25%. Apparently, one policymaker preferred monetary tightening to mystery candles.
  • The BOJ warned that core inflation could accelerate to a level “clearly above” its 2% target from the second half of fiscal 2026.
  • That language keeps additional rate increases on the table, even if Governor Kazuo Ueda’s board declined to deliver one Friday.
  • The dollar-yen subsequently rebounded toward ¥160.70, showing how quickly intervention gains can evaporate when fundamentals remain unfriendly.
  • Japan can knock the dollar lower with surprise buying. Keeping it there may require higher rates, repeated intervention or considerably more nervous dollar bulls.