Japan chief cabinet secretary Matsuno:

  • No comment on whether Japan intervened in fx market
  • Important for currencies to move stably reflecting fundamentals
  • Excessive fx moves undesirable
  • Will continue to take appropriate steps on fx

Finance Minister Suzuki and his head of FX Kanda have both refused to comment on whether Japan intervened in the FX market also.

It wasn't just someone buying a few yen on a wild punt:

usdyen intervention 04 October 2023  22