Japanese yen volatility hits a ten-week high again, with intervention rumors resurfacing before Bessent’s visit

Japan’s Deputy Finance Minister Atsushi Mimura recently said the Japanese government is ready to deal with speculative behavior in the foreign exchange market from multiple angles. The remarks come amid high market suspicion that authorities carried out multiple currency interventions during Japan’s Golden Week holiday period to support a weak yen. Mimura said the authorities are monitoring market developments with high urgency, especially unusual recent price fluctuations. Although the yen rose about 1.8% in a single half hour on Wednesday to reach a ten-week high of 155.04, the authorities still refused to comment on specific defense levels.

Official Japan statements and a multi-pronged monitoring strategy

According to Bloomberg, Japanese Finance Ministry Deputy Minister Atsushi Mimura said on Thursday that, in response to fluctuations in the currency market, the authorities are taking a comprehensive approach. The statement not only reflects the government’s intense attention to the current trend of the yen, but also implies that intervention tools may no longer be limited to traditional patterns. When asked whether yen moves were driven by crude oil futures, Mimura emphasized that the official side is continuing to watch the market with extremely high urgency, especially regarding speculative moves that deviate from fundamentals. This “all-around” strategy aims to reduce the market’s expectations for any single indicator by using policy signaling across multiple channels and potential capital actions, thereby enhancing the psychological deterrent effect of intervention.

Sharp yen volatility during Golden Week

As Japan’s Golden Week holiday break came to an end, market participants were closely examining the abnormal swings that appeared on Wednesday. That day, the yen-to-U.S. dollar exchange rate climbed about 1.8% from a low level within just 30 minutes, reaching 155.04 and hitting a new high in nearly ten weeks. Because it was a Japanese public holiday at the time and market liquidity was lower, such sharp movement triggered strong market associations with the Finance Ministry taking “front-end intervention.” Although Mimura refused to comment and also declined to disclose whether the government has specific defense exchange-rate levels, the timing of his remarks clearly aimed to sustain investors’ vigilance after the holiday ends and market participants return.

In the run-up to the 4/30 holiday, the yen also surged by as much as 3% at one point. Although the official side did not indicate intervention, it said plainly, “Everyone knows what happened,” and there were also reports that relevant people were notified to keep their phones reachable during the holiday.

(Yen jumps more than 3% in one day to 155: Yoshi Katsuyuki warns of an “decisive intervention” soon)

IMF exchange-rate regime rules and controversy over intervention frequency

Regarding discussions in the market about whether Japan might be limited by the number of interventions, amid the International Monetary Fund (IMF) guidelines for a Freely Floating Exchange Rate System, some views hold that to maintain a freely floating status, Japan might have only a handful of intervention opportunities left before November. However, Atsushi Mimura rebutted such interpretations, saying clearly that the rules do not restrict how frequently Japan can enter the market. The remarks show Japan’s firm stance in defending national currency sovereignty, intending to convey to the outside world that Japan will not be constrained by international standards—so long as the market sees excessive volatility, the authorities will be ready to take necessary action at any time.

U.S. Treasury Secretary Bessent to visit Japan next week; yen exchange rate discussions on the agenda

Meanwhile, according to Nikkei, U.S. Treasury Secretary Bessent plans to visit Japan for three days starting next Monday (the 11th). He intends to hold talks with Japanese Prime Minister Sanae Takaichi, Finance Minister Amina Kiyomi and other officials, including Bank of Japan Governor Kazuo Ueda. Multiple Japanese and U.S. diplomatic sources have relayed this information. Responding to speculative yen selling will also be a topic.

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