Hedge funds placed a very large bet against the Japanese yen, and then the yen moved against them. CFTC data shows that leveraged funds accumulated net short positions of roughly 138,000 contracts in yen futures as of June 30, 2026, the highest reading since 2007. The yen then strengthened sharply, and a rapid unwind followed.
How the trade got so large
The logic behind shorting the yen was straightforward: Japan kept interest rates near zero while the US Federal Reserve held rates at significantly higher levels. Borrowing in a low-rate currency to invest in higher-yielding assets, the classic carry trade, made the yen a natural funding currency for global funds.
The USD/JPY exchange rate reflected the pressure. The pair briefly surpassed 162, meaning the yen was at its weakest level against the dollar since 1986.
The intervention that changed everything
Japan’s Ministry of Finance moved aggressively. Coordinated intervention by the US and Japan in late July and early August 2026 knocked the trade sideways. Japan had already spent approximately 11.73 trillion yen, equivalent to roughly $72.7 billion, from late April through late May in earlier rounds of support for the currency.
The effect on positioning was swift and significant. By August 4, 2026, net short contracts held by leveraged funds had dropped to approximately 63,600, a reduction of more than 50% in a matter of weeks.
The most recent CFTC commitment of traders report, covering the week ending August 25, 2026, showed large speculators holding a net short position of 63,298 contracts, down 10,405 contracts from the prior week. Leveraged funds specifically sat at a net short of 77,042 contracts as of that same date.
What the remaining shorts mean for markets
Analysts at JPMorgan flagged that remaining bearish positions are estimated to exceed $100 billion in notional value, and they project meaningful risk of accelerated short covering if USD/JPY falls below 155.
JPMorgan’s concern about the remaining $100 billion-plus in bearish exposure is essentially a warning that the volatility episode may not be over. With 77,042 net short contracts still sitting on leveraged fund books as of late August, the market has absorbed a large unwind but has not fully cleared the position. Any fresh catalyst, whether a Bank of Japan rate move, another round of intervention, or a shift in US rate expectations, could restart the squeeze.