JPMorgan Chase and Co. strategists estimate that ¥16 trillion to ¥17 trillion, roughly $102.6 billion, of bearish yen positions remain outstanding, and a break of dollar-yen below 155 could trigger a cascade of covering that theoretically drives the pair toward 142-146. The note, published Thursday, arrives after the currency staged one of its sharpest rallies since the joint US-Japan intervention in late July, when dollar-yen touched 160.39 before reversing to 155.30, a whisker from the post-intervention low of 155.23.
The short overhang
“Recent price action appears to corroborate our view that a relatively large JPY short position may still be outstanding,” strategists including Junya Tanase wrote. If the 155 level gives way, they said, “the risk cannot be ruled out that selling could beget further selling and drive a larger-than-expected yen appreciation.” The arithmetic is straightforward: a complete unwind of the estimated short book would remove a structural source of dollar demand and yen supply at a moment when speculative positioning is already stretched.
Catalysts and amplification
The rally has been fed by two narratives. One is speculation that the Government Pension Investment Fund may shift its asset allocation. The other is mounting expectations for faster Bank of Japan rate hikes. Market participants say those catalysts have been amplified by the very short covering JPMorgan highlights, plus hedging demand from domestic investors, creating a feedback loop that can overshoot fundamentals.
JPMorgan’s own skepticism
The bank’s strategists, however, call expectations around both GPIF and the BOJ “a bit excessive.” They do not assign a high probability to dollar-yen falling materially below their assumed 155-165 range for now. In other words, the unwind risk is real, but the base case remains a grind rather than a crash, unless the 155 dam breaks and the short book decides to exit all at once.