JPMorgan Chase: A break above 155 for the yen could trigger a wave of short covering, with the appreciation potentially exceeding expectations.

The recent sharp appreciation of the yen is pushing short positions, amounting to over $100 billion, to a tipping point.

JPMorgan strategists have warned that if the USD/JPY pair falls below 155, there is a risk of a concentrated liquidation of large outstanding short yen positions, potentially triggering a chain reaction of selling and pushing the yen higher than market expectations. JPMorgan estimates that there are currently approximately 16 trillion to 17 trillion yen (about US$102.6 billion) in outstanding short yen positions.

Strategists point out that if all the aforementioned short positions were closed, the USD/JPY pair could theoretically be pushed down to the 142-146 range. This scenario poses a significant risk to investors holding short yen positions, and also means that the yen's appreciation potential could far exceed current market pricing.

Rapid reversal, short sellers under pressure

The yen's appreciation this round has been sharp. The USD/JPY pair climbed to 160.39 earlier this week, the highest level since the joint intervention by Japan and the US, before reversing sharply to a low of 155.30, approaching the post-intervention low of 155.71.

In a research report, JPMorgan strategists Junya Tanase and others wrote, "Recent price action seems to confirm our assessment—there are still relatively large short positions in the yen in the market." If the USD/JPY pair falls below 155, "the risk that selling pressure could trigger further selling, thereby driving the yen to appreciate more than expected, cannot be ruled out."

Multiple catalysts amplify fluctuations

This round of yen rebound is driven by multiple factors. Market expectations that the Government Pension Investment Fund of Japan (GPIF) may adjust its asset allocation, and rising bets on the Bank of Japan accelerating its interest rate hikes, constitute the main catalysts. Market observers point out that these factors have been further amplified by speculative yen short covering and domestic investors' hedging needs, increasing the risk that further yen appreciation will force more short covering.

Despite issuing the aforementioned warning, JPMorgan Chase also stated that current market expectations surrounding GPIF and the Bank of Japan "appear somewhat excessive," and the bank does not believe there is a high probability that the USD/JPY exchange rate will fall significantly below its pre-set range of 155 to 165 in the near term. This means that, under the baseline scenario, JPMorgan Chase tends to view the current range as a relatively reasonable fluctuation range, but the tail risk from short covering should not be ignored.

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