Did Japan Just Intervene Again? Yen Surges Over 3% Against Dollar, Speculation Mounts

The Japanese yen suddenly surged over 3% against the U.S. dollar on Thursday (30th), marking its largest single-day gain since December 2023, sparking market speculation that the Japanese government may have re-entered the forex market to halt the yen's prolonged depreciation. However, Japanese authorities have not officially confirmed any action.

The yen had earlier fallen to around 164 per dollar, hitting a nearly 40-year low, before sharply rebounding to as high as 157.98 in New York trading, with the intraday gain reaching up to 3.3%. Geoffrey Yu, senior strategist at BNY Mellon, said the scale of the move strongly suggests official intervention, though the durability of such measures remains questionable.

(Image: ZeroHedge)

Officials at Japan's Ministry of Finance have not responded, and the White House has not commented on the reports. Earlier this month, Japan's top foreign exchange official, Atsushi Mimura, did not reiterate the Ministry of Finance's usual policy stance during a Bloomberg interview, including its readiness to take 'bold action,' which had already sparked market speculation.

The yen has recently faced downward pressure from rising oil prices, concerns over Japan's fiscal health, and an excessively wide interest rate differential with the U.S. Despite record intervention by Japanese authorities last quarter, the yen fell to its lowest level since 1986 in June and weakened further in July.

Between April 28 and May 27, Japan is believed to have spent a record 11.73 trillion yen (approximately $73.2 billion) to support the yen. Data on Japan's foreign exchange reserves suggest authorities may have sold foreign securities, including U.S. Treasuries, to fund the intervention.

Japan's past interventions have mostly had limited effects. Authorities conducted their first yen-buying intervention since 1998 in 2022 and spent around $100 billion in 2024, but such moves typically only temporarily reverse declines, with the yen resuming its depreciation afterward.

This sharp rise occurred just before the Bank of Japan (BOJ) announces its interest rate decision on Friday (31st). Markets expect the BOJ to hold rates steady this time, following last month's rate hike that pushed the benchmark rate to its highest level since 1995.

The Federal Reserve (Fed) also held rates steady this week, but markets still anticipate a rate hike later this year in the U.S., keeping the U.S.-Japan interest rate differential unfavorable for the yen. However, the dollar briefly weakened after the Fed's announcement, allowing Japanese authorities, if they did intervene, to push the yen higher in line with market momentum. Analysts noted that acting after the U.S. rate decision and after Japan's market close aligns with the Ministry of Finance's past operational patterns.