USDJPY plunges 2.5% as suspected BoJ intervention shakes yen shorts

The yen surged more than 2.5% against the dollar Thursday in a move traders attributed to yen-buying intervention by Japanese authorities.

The yen strengthened more than 2.5% against the dollar Thursday, pushing USDJPY below 160 for the first time in a month, as traders suspected Japanese authorities intervened to support the currency after it touched a 52-week high.

"The speed and scale of this move has all the hallmarks of official intervention — the break below 160 was too clean to be purely technical," a Tokyo-based currency strategist at a major Japanese bank said. "Markets have been on alert for weeks after repeated warnings from Finance Ministry officials."

USDJPY fell as low as 159.38, down from levels above 163 earlier this week, before paring some losses. The pair broke below its 200-hour moving average and an upward-sloping trendline near 163.36 earlier in the session, a technical breakdown that may have given officials cover to act. The move accelerated after U.S. data showed the economy grew at a 1.5% annualized rate in the second quarter, below the 2.1% consensus estimate, while the core PCE price index — the Fed's preferred inflation gauge — rose 0.1% month over month in June, also below the 0.2% forecast.

The intervention, if confirmed, would mark Japan's most aggressive foray into currency markets since authorities spent a record ¥9.8 trillion defending the yen in 2024. The BoJ's policy board meets later Thursday, with markets pricing a hold at 1.00%. Any shift in forward guidance could determine whether the intervention has lasting impact or proves temporary against persistent dollar strength.

Technical Breakdown Paves the Way

The move lower accelerated after USDJPY breached several key technical levels. The pair had traded near its 52-week high of 163.86 earlier this week, with CFTC data showing speculative short positions against the yen at 152,100 contracts — near multi-year extremes. That crowded positioning created conditions for a sharp squeeze when the technical break triggered stop-losses, amplifying the move.

The U.S. economic data released Thursday provided additional fuel. Personal income rose 0.2% in June, below the 0.3% consensus, while personal spending increased 0.3%, also missing estimates. The core PCE deflator came in at 3.3% year over year, matching expectations but down from 3.4% in May, suggesting inflation is gradually cooling even as the economy slows. The GDP price index surged to 6.3% from 3.6% in the prior quarter, well above the 4.1% forecast, signaling persistent price pressures in the broader economy.

BoJ Decision Looms Over Yen Outlook

The intervention speculation comes hours before the BoJ's monetary policy decision, due early Friday Tokyo time. The central bank is expected to hold its policy rate at 1.00% after raising it from 0.50% earlier this year. Markets will focus on Governor Kazuo Ueda's press conference for any signal on the pace of future tightening.

Tokyo's core CPI, due alongside the decision, is expected to accelerate to 1.8% year over year in July from 1.6% in June, which could strengthen the case for further normalization. The BoJ's quarterly outlook report will also be released, offering updated inflation and growth projections through fiscal 2027. Household confidence improved to 34.9 in July from 33.8, beating the 34.2 consensus, suggesting consumer sentiment is stabilizing despite the weak yen.

If the BoJ signals a faster path to rate normalization, it could reinforce the yen's recovery. If it maintains a cautious stance, the intervention may only provide temporary relief against a backdrop of wide interest rate differentials between Japan and the U.S., where the 10-year Treasury yield sits at 4.67% and the 30-year yield has touched 5.22%, a 19-year high.

This article is for informational purposes only and does not constitute investment advice.