Hedge Funds Place Aggressive Bets on Yen Rally, Targeting 140 Level

Hedge funds are making increasingly aggressive bets on a sustained rally in the Japanese yen, positioning for the currency to strengthen significantly against the U.S. dollar through the end of the year. This shift follows the yen's most rapid appreciation since 2022, a move that shattered a key technical level and has reshaped positioning in the global foreign exchange market.

Options Market Signals Strong Conviction

The derivatives market is flashing clear signals of this bullish sentiment. According to data from the CME, the total volume of put options on the USD/JPY pair—bets that the dollar will fall against the yen—expiring by year-end is now more than three times the volume of call options.

One of the most active contracts on Tuesday was a November put option with a strike price of 142.86. More aggressive, longer-term trades are targeting even lower levels. Graham Smallshaw, a senior FX trader at Nomura, told Investing.com that demand has extended to 12-month options, with some traders using complex strategies to target the 140 level.

The 155 'Line in the Sand' Breaks

Last week, the USD/JPY pair plunged from above 160 to a seven-month low near 152.89. The pivotal moment was the decisive break below the 155 level, a support line that had held firm even during Japan's massive ¥15.4 trillion (approx. $98.6 billion) intervention in May.

The collapse of this support was driven by soaring market expectations for a Bank of Japan interest rate hike at its September 18 meeting, with overnight index swaps (OIS) pricing in a 98% probability. Hawkish commentary from BOJ Governor Kazuo Ueda and board member Hajime Takata fueled the speculation, triggering a cascade of stop-loss orders from yen short-sellers and forcing options dealers to sell dollars to hedge their positions, which accelerated the yen's gains.

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Wall Street Sees an Institutional Shift

Major investment banks view this as more than a short-term trade. "Leveraged investors have been active, reacting to what could be a regime shift in the currency," said Jerry Minier, global head of G10 spot trading at Citigroup in London, according to the source. He noted that the yen's resilience, even after a strong U.S. non-farm payrolls report, has boosted investor confidence.

Nomura has observed a similar trend among macro hedge funds. Smallshaw stated that these funds significantly increased their short USD/JPY positions after the 155 level was breached, with many now focusing on a target range of 150/152. This move is also prompting a wider unwinding of the popular yen "carry trade," where investors borrow in low-cost yen to invest in higher-yielding assets abroad.

All Eyes on the Bank of Japan

The market's next major test is the BOJ's policy decision on September 18. With a 25-basis-point hike almost fully priced in, the central bank's forward guidance will be critical. A "dovish hike," where the BOJ signals a long pause, could trigger a wave of profit-taking and reverse the yen's recent rally.

Conversely, if Governor Ueda indicates that the September hike is the start of a more accelerated tightening cycle, the yen could see further strength. "To sustain the yen's recent gains, the Bank of Japan needs to deliver a hawkish message," said Rodrigo Catril, a strategist at National Australia Bank. He added that the market needs to believe another hike before year-end is more likely than not.