TOKYO — Japan spent a record amount in a single day to defend the yen this summer, official figures released on Monday, November 9, have revealed: the Finance Ministry bought 7.9756 trillion yen — about $50.4 billion, yaani roughly 5,040 crore US dollars — on July 30 alone, the largest one-day yen-buying intervention on record, Dow Jones Newswires reported from the ministry's data.

Source: Dow Jones Newswires (Megumi Fujikawa), Nov 9 2026

¥7.9756 trillion (~$50.4 bn)bought on July 30, 2026 — the largest single-day intervention on record
¥15.3993 trillion (~$97.16 bn)total across three days in July–August — yaani about 9,716 crore US dollars
¥6.2787 trillionthe previous daily record, set on April 30, 2026 — the new record is about 27% bigger
164 per dollarthe yen's weakest level in about 40 years, touched in late July before Tokyo acted

The daily breakdown, published in the ministry's quarterly figures for July to September, shows the buying came on three days, one more than traders had believed at the time: ¥7.9756 trillion on July 30, ¥5.5523 trillion on July 31 and ¥1.8714 trillion on August 3, Xinhua reported from the same data. The first day alone accounted for more than half of the three-day total, and the summer campaign exceeded what Japan spent in its April–May operations.

Source: Xinhua, Nov 9 2026

First joint action with Washington since 1998

The July 31 operation was coordinated with the United States — the first joint intervention to support the yen since 1998. Finance Minister Satsuki Katayama and US Treasury Secretary Scott Bessent confirmed the coordinated action, which was intended to curb disorderly currency movements; Japan sold dollars to buy yen, while the American side sold euros for yen, according to the detailed reporting of the ministry figures. South Korea's central bank also timed purchases of the won alongside Japan's action, broadening the regional response.

Source: Asia Daily, from Japan Finance Ministry quarterly intervention data, Nov 9 2026

The trigger was the yen's slide into the upper 163 range against the dollar in late July — its weakest level in 39 years and eight months. Intervention works by selling dollars and buying yen on the foreign-exchange market, creating a large buyer for the currency at the moment selling pressure is pushing it down. The Finance Ministry directs Japan's intervention and the Bank of Japan carries out the transactions. 'The enormous scale of intervention underscored the government's sense of urgency to stem the yen's decline,' Tsuyoshi Ueno, senior economist at the NLI Research Institute, said.

Source: Asia Daily, from Japan Finance Ministry quarterly intervention data, Nov 9 2026

What is solid

  • Japan bought ¥7.9756 trillion on July 30, 2026, its largest single-day yen-buying intervention on record — Finance Ministry quarterly data, reported by Dow Jones and Xinhua
  • Three operations (July 30, July 31, August 3) totalled ¥15.3993 trillion, about $97.16 billion — Finance Ministry data
  • The July 31 operation was coordinated with the United States, the first such joint yen support since 1998, confirmed by Finance Minister Katayama and Treasury Secretary Bessent — Dow Jones

What is only claimed

  • The exact date of the third, smallest purchase: the ministry's detailed daily figures place the ¥1.8714 trillion operation on August 3, while one summary of the disclosure dated it August 1; the amount and the three-day total are the same in both accounts
  • Whether intervention can hold the yen: the currency strengthened to the 152 range by early September but has since slipped back to about 158 per dollar, and analysts cited by Dow Jones say the wide US–Japan interest-rate gap is the force intervention alone cannot remove

Why the yen is still hovering near 158

The intervention initially worked: the yen strengthened into the lower 155 range on August 3 and briefly reached the 152 range on September 8, its strongest in about six months. But by Monday morning in Tokyo it was trading around 158.30 per dollar, Dow Jones reported, as expectations of further Federal Reserve rate increases reinforced the view that the US–Japan interest-rate gap — the basic reason investors prefer holding dollars — is here to stay. Japanese authorities conducted a rate check on September 18–19, the step traders read as a warning that intervention may follow, as the currency weakened again.

Source: Asia Daily, from Japan Finance Ministry quarterly intervention data, Nov 9 2026

The Bank of Japan raised its policy rate to 1.25% in September and is expected to act again by the end of the year; the central bank has cited the yen's weakness as a major factor in Japan's economic and inflation outlook, and Governor Kazuo Ueda has pointed to the risk that energy costs feed through to consumer prices. Bessent, for his part, was outspoken during the summer about the yen's slide, backing Tokyo's steps against undervaluation and noting its role in driving up Japanese inflation.

Source: Dow Jones Newswires (Megumi Fujikawa), Nov 9 2026

What happens next

Monday's disclosure changes no policy by itself — it is the official record of what Tokyo already did in secret over the summer, released a quarter later. Its importance is the signal: Japan has now shown it will spend record sums, and act jointly with Washington, when the yen nears 164. The next tests are the Bank of Japan's expected rate move before year-end and whether the yen's drift back toward 160 forces Katayama and top currency official Atsushi Mimura to order a fourth round.