Yen Short Positions at Stretched Levels, Raising Reversal Risk: BofA

Speculative bets against the Japanese yen have reached stretched levels, raising the risk of a sharp market reversal, according to a new analysis from Bank of America. The firm noted that foreign investors turned into net sellers of Japanese assets in June, adding to pressure on the currency.

Stretched Positioning and Foreign Outflows

Bank of America's research, published Monday, highlights that speculative short yen positioning on the CME is approaching levels last seen in July 2024. This build-up in bearish bets coincides with a significant shift in capital flows, according to the bank's analysis of Japan’s Ministry of Finance data.

After a period of substantial inflows, portfolio investment flows reversed to net outflows in June as foreign investors sold both Japanese bonds and equities. Further signaling a shift in market sentiment, the one-year USD/JPY risk reversal—a measure of demand for options protecting against currency swings—moved into positive territory for the first time since 2022.

Drivers of Yen Weakness

The persistent yen weakness is being fueled by several factors, according to the bank. The gradual accumulation of yen carry trades, where investors borrow in the low-yielding yen to invest in higher-yielding assets abroad, continues to exert downward pressure, particularly from offshore markets.

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Analysts also pointed to growing market attention on Japan's fiscal situation and a widespread perception that the Bank of Japan has fallen "behind the curve" in normalizing monetary policy compared to other major central banks. These concerns have contributed to speculative yen selling.

Potential Catalysts for a Reversal

Despite the bearish sentiment, BofA identifies three potential catalysts that could trigger a rapid unwinding of these short yen positions, which could lead to a sharp yen appreciation.

• Aggressive FX intervention by Japanese authorities that exceeds current market expectations.
• A significant reversal of the global AI-driven equity rally, which could dampen risk appetite and unwind carry trades.
• A major policy shift in response to market pressure, which the bank specifically mentioned could occur under a potential "Takaichi administration."

The report also noted that Japan's underlying balance of payments is showing signs of improvement, as strong export growth fueled by AI-related demand is helping to offset the country's digital services deficit.