Yen rebounds from four-decade lows as intervention risk builds

The yen bounced hard off four-decade lows late in the week, with USD/JPY retreating from the mid-161 area toward a more than two-week low after peaking near 162.84. The abrupt move revived speculation that Japanese authorities may have intervened on behalf of the Ministry of Finance, though the reversal likely reflected several factors: heavily stretched short-yen positioning, thin holiday liquidity, a slightly less hawkish tone from Fed Chair Warsh, and a Reuters report suggesting Tokyo may stop flagging intervention in advance to catch speculators off guard.

Japanese officials kept up verbal pressure, with Finance Minister Satsuki Katayama repeating that authorities stand ready to act at any time and are in close contact with the US on FX policy. The softer dollar after the weak US jobs report added to the yen's support, as did lingering expectations that the Bank of Japan could tighten further later this year.

The structural headwinds have not gone away. A wide US-Japan rate gap continues to fuel carry trades, and earlier this year Japan spent tens of billions of dollars on intervention with only fleeting effect. Traders are watching Japanese wage and spending data and the June FOMC minutes for the next cues, with intervention risk described as elevated given stretched positioning.