The Japanese yen is showing signs of a potentially major turnaround, putting traders who have spent months betting against the currency under increasing pressure.
After plunging to a four-decade low against the U.S. dollar just weeks ago, the yen has sharply strengthened this week. The move has forced investors to reconsider one of the market’s most crowded trades: betting that Japan’s currency would continue to weaken.
The yen was on track for roughly a 2% weekly gain against the dollar as of Friday, its strongest weekly performance since the rare joint U.S.-Japan intervention at the end of July. Reuters reported that positioning data from Citigroup also showed a striking shift, with yen positioning moving from bearish to bullish since the beginning of August.
What changed for the yen?
Several forces are now working in the yen’s favor.
The biggest catalyst has been growing expectations that the Bank of Japan could raise interest rates later this month. Markets were pricing in roughly a 97% probability of a 25-basis-point increase to 1.25%, according to Tokyo Tanshi data cited by Reuters.
The prospect of a larger increase or a faster series of rate hikes has also entered the conversation, although a 50-basis-point move at the September meeting remains widely viewed as highly unlikely under Governor Kazuo Ueda’s cautious approach.
The shift is significant because higher Japanese interest rates could reduce the incentive for investors to borrow cheaply in yen and put the money into higher-yielding assets overseas — a strategy known as the yen carry trade.
If those positions are unwound rapidly, traders may need to buy yen to repay their borrowing, potentially creating another wave of demand for the currency.
The intervention threat is still hanging over the market
Japan’s authorities have also kept pressure on traders betting on further yen weakness.
Japan’s top currency diplomat, Atsushi Mimura, said Friday that authorities remain on high alert regarding exchange-rate movements and reiterated Tokyo’s readiness to respond to excessive currency moves.
That warning comes after an extraordinary episode in late July, when Japan and the United States coordinated action to support the yen after it had fallen to around ¥164 per dollar — a level not seen since the 1980s.
The Japan Times reported that the yen’s latest rally did not appear to be the result of another confirmed intervention. Analysts noted that the move was more gradual than the abrupt price action normally associated with direct official intervention.
That distinction matters: the latest rally appears to be increasingly driven by changing expectations about monetary policy, investor positioning and capital flows rather than simply government buying.
U.S. pressure adds another layer
The yen’s rebound is also unfolding against a backdrop of unusually close U.S.-Japan discussions over currency policy.
U.S. Treasury Secretary Scott Bessent has publicly argued that Japan should take decisive monetary steps to address the yen’s weakness. He also met with BOJ Governor Kazuo Ueda during meetings of G20 finance officials.
Japan and the United States have separately agreed to continue coordinating on maintaining orderly currency movements, according to Japanese Finance Minister Satsuki Katayama.
The combination of Japanese policy pressure and U.S. interest-rate expectations is therefore giving investors another reason to reassess the dollar-yen trade.
Japanese investors may also be bringing money home
Another potentially important factor is the movement of Japanese capital.
Rising Japanese government bond yields could make domestic assets more attractive to Japanese institutional investors, potentially encouraging some funds to return from overseas markets.
Reuters cited official data showing Japanese investors have been reducing foreign bond holdings at the fastest pace in four years. The possibility of greater capital repatriation could provide additional structural support for the yen.
Japan’s 10-year government bond yield also recently moved above 3% before retreating as the yen strengthened, highlighting how closely the currency and domestic bond markets are now interacting.
The biggest risk may be the traders already betting against the yen
This is where the story could become particularly important for global markets.
Reuters reported that J.P. Morgan estimates yen-short positions accumulated since Prime Minister Sanae Takaichi took office last October could total approximately ¥17 trillion ($109 billion).
If those positions were aggressively unwound, J.P. Morgan analysts estimated that USD/JPY could potentially fall toward the 142–146 range. That is not a forecast that the move will necessarily happen, but it illustrates how powerful a broad short-covering episode could become.
In other words, the danger for yen bears is no longer simply that the currency might stop falling.
It is that a relatively modest yen recovery could force heavily positioned traders to close their short positions — creating additional yen demand and potentially accelerating the move.
Could the yen rally continue?
There are still major uncertainties.
The Federal Reserve’s policy direction remains crucial because the interest-rate gap between the United States and Japan has been one of the fundamental drivers of the yen’s weakness.
More dovish expectations for U.S. monetary policy could narrow that gap, while faster-than-expected BOJ tightening could strengthen the yen’s appeal.
But the yen remains vulnerable to renewed selling if Japanese rate expectations fade, U.S. yields rise sharply or investors return to carry trades.
For now, however, the market’s psychology appears to be changing.
The currency that traders once treated as a one-way bet is suddenly forcing those same traders to reconsider their positions.
And that may be the most important development of all: the yen’s biggest threat to the bears may no longer be a government intervention — it could be the bears themselves rushing for the exit.
WWC ONE MEDIA M.J.E
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