The Surging U.S. Dollar and the Unwinding Yen Carry Trade: A Reassessment of Risk-On Positioning

The U.S. Dollar's surge against the Japanese Yen in 2025 has become a focal point for global investors, driven by a confluence of monetary policy divergence, the unwinding of the yen carry trade, and shifting risk-on positioning. As of September 28, 2025, the USD/JPY rate stands at 152.46, a 3.09% increase from its level on September 30, 2025, according to an Investing.com analysis. This sharp appreciation reflects broader structural shifts in global capital flows and underscores the fragility of carry trade strategies in an era of tightening central bank policies.

The Carry Trade Unwinding: A Catalyst for Yen Volatility

The yen carry trade, long a staple of global investors seeking yield, has faced mounting headwinds in 2025. For years, investors borrowed yen at near-zero rates under the Bank of Japan's (BOJ) accommodative policy and reinvested in higher-yielding assets, such as U.S. Treasuries and equities. However, the BOJ's decision to raise its policy rate to 0.50% in mid-2024-marking its first tightening in over a decade-significantly compressed the interest rate differential with the U.S. Federal Reserve, which maintained rates near 5.0%, as detailed in the Investing.com analysis.

This narrowing spread has eroded the profitability of carry trades. For instance, an investor who borrowed 1 billion yen in July 2025 to invest in USD assets would see their profit margin shrink from 4.25% to 3.75% if the Fed cuts rates to 4.25% by year-end, a scenario outlined in the Investing.com analysis. Compounding this, a hypothetical yen appreciation from 160 to 150 would increase repayment costs in USD terms, further squeezing returns. As a result, many investors have begun unwinding positions, triggering a self-reinforcing cycle of yen strength and asset sales.

The unwinding has had cascading effects on global markets. In July 2025, the USD/JPY rate plummeted from 160 to 142 within weeks as investors repaid yen loans and liquidated risk assets to meet margin calls, according to a Lumajournal post. This forced selling contributed to a 325-point drop in the S&P 500 over five days, illustrating the interconnectedness of currency and equity markets-a dynamic highlighted in a MidForex forecast.

Risk-On Positioning: A Double-Edged Sword

While the unwinding of the yen carry trade has driven yen strength, shifts in risk-on positioning have further complicated the landscape. In 2025, investors have increasingly favored high-yield assets amid optimism about global economic resilience. However, this shift has been uneven. For example, trade policy changes and geopolitical tensions have created fragmentation in risk appetite, with corporate treasurers prioritizing resilience over growth, as noted in a BNP Paribas outlook.

The interplay between risk-on positioning and the yen carry trade is evident in the USD/JPY's recent volatility. When investors adopt a risk-on stance, they often re-enter carry trades, pushing the yen lower. Conversely, risk-off sentiment-triggered by events like U.S. inflation concerns or BOJ policy surprises-can force rapid yen appreciation. This duality is reflected in the mixed forecasts for the pair: some analysts predict a rise to 149.86 by October 2025 due to Fed rate cuts, according to an EBC forecast, while others anticipate a decline to 140.7157 by September 2025 as the yen recovers, per a MidForex forecast.

Policy Divergence and the Path Forward

The Federal Reserve's anticipated rate-cutting cycle, combined with the BOJ's cautious tightening, will likely keep the USD/JPY in a volatile range. As of September 2025, the pair is expected to trade between 140.25 and 151.00 in the fourth quarter, with the Fed's easing and potential BOJ hikes in October 2025 reinforcing the dollar's strength, according to an Archyde outlook. However, the yen's role as a safe-haven asset remains under scrutiny. While it historically appreciated during global risk-off episodes, its reliability has been questioned amid U.S. fiscal concerns and shifting market sentiment, as discussed in the EBC forecast.

For investors, the key takeaway is the need to hedge against sudden shifts in carry trade flows and policy divergence. The unwinding of the yen carry trade has demonstrated how quickly capital can reallocate, creating both risks and opportunities. Those with exposure to USD/JPY should monitor central bank communications closely, particularly the Fed's inflation outlook and the BOJ's stance on rate hikes.

Conclusion

The surging U.S. Dollar against the Japanese Yen in 2025 is a product of structural forces: the unwinding of the yen carry trade, divergent monetary policies, and evolving risk-on positioning. While the dollar's dominance appears secure in the near term, the fragility of carry trade strategies and the yen's potential recovery highlight the need for dynamic risk management. As global markets navigate this complex landscape, investors must remain agile, balancing yield-seeking opportunities with the realities of a rapidly shifting monetary environment.