Yen Rally Stalls After Record Intervention as Bank of Japan Holds Rates

The Japanese yen’s rally stalled in choppy trading on Friday, erasing much of the previous day's gains after the Bank of Japan left interest rates unchanged. The currency traded up roughly 0.1 percent at 159.35 against the US dollar in New York, a sharp deceleration from Thursday’s 3.3 percent surge.

Thursday’s market movement followed an estimated 8.45 trillion yen, or $52.8 billion, currency intervention by Japanese authorities. Data indicates this was likely the largest single-day intervention by Tokyo on record, driving trading volumes to their highest level in nearly 12 years.

Despite the historic scale of the operation, the yen remains under relentless pressure. The currency has recently sunk to its weakest level since 1986, weighed down by rising oil prices, persistent budget deficits and a widening interest-rate gap with the United States.

Market participants are now questioning the longevity of such defensive measures. “Ultimately, intervention will likely have only a temporary effect on the currency, unless fundamentals change,” noted Yusuke Miyairi, a foreign-exchange strategist at Nomura International Plc.

The central bank’s decision to hold rates steady reinforced these fundamental concerns. Governor Kazuo Ueda offered little fresh support for the yen during his post-decision briefing, acknowledging upside inflation risks but stopping short of signaling an imminent rate hike.

This cautious stance leaves the core driver of the yen’s weakness intact. Macro strategists observe that the widening US-Japan rate differential continues to sustain elevated dollar-yen levels, especially when previous tightening effects and global geopolitical risks are still being assessed.

Nevertheless, speculation persists that Tokyo could intervene again if volatility worsens. US Treasury Secretary Scott Bessent recently stated that the yen is “very undervalued” and that excess volatility is unhealthy, adding that the US and Japan maintain close coordination.

Financial institutions acknowledge the temporary utility of these moves. A Goldman Sachs team including Michael Cahill and Lexi Kanter noted that while intervention is not a sustainable solution, it effectively dampens the currency’s sensitivity to cyclical momentum, and Japan possesses significant foreign exchange reserves to sustain the policy.

Traders are already adjusting their positions in response to the muted reaction. Nomura strategists have advised clients to buy the euro against the yen, targeting a roughly 4 percent rally in the single currency, while the yen showed only modest strength against other Group of 10 peers on Friday.