Japan and US Conduct First Joint Intervention in 15 Years, Yen Rises 1.3% to 155.37

Summary

The Yen surged 1.3% to 155.37 following the first joint intervention by Japan and the U.S. since 2011 Sina Finance. Japan’s Ministry of Finance confirmed coordinated action with the U.S. Treasury, involving massive Yen purchases totaling nearly $59 billion in a single day last week to combat the currency’s slide toward 164 .

Impact Analysis

So basically, the era of Japan fighting a lonely battle against Yen depreciation is over, and that’s a massive regime shift. The interesting part isn’t just the 1.3% jump to 155.37 Sina Finance; it’s the U.S. Treasury actively participating in what could be the first bilateral JPY-buying operation since 1998 . When Secretary Bessent signals readiness to intervene again and Trump frames it as a “symbol of friendship” Sina Finance, they are effectively placing a political floor under the Yen.

Market’s missing that this isn’t just smoothing volatility—it’s a coordinated strike against a crowded short trade. Japan’s $59 billion intervention last Thursday was the opening salvo . By involving the NY Fed and even South Korea , authorities have turned a technical correction into a geopolitical mandate. I’d read this as a clear warning: the Yen carry trade is officially in the crosshairs. If you’re shorting JPY now, you’re no longer just betting against the BOJ; you’re betting against a unified front of global central banks. Expect a violent squeeze as positioning resets.