Hedge funds aggressively go long on the yen: betting on a surge past the 150 mark by the end of the year, targeting 140.

As the exchange rate of the US dollar to the yen plummeted from above 160 to around 153 within a week, with a decline nearing 5%, the power dynamics in the global foreign exchange market are undergoing a dramatic restructuring. Hedge funds are betting with unprecedented intensity on further appreciation of the yendata from CME shows that on Tuesday (September 8), the most actively traded options were a put option with a strike price of 142.86 expiring in November, with the total volume of puts expiring by year-end more than three times that of calls. Some long-term options trading even set targets as low as 140. The breach of the 155 defense line: the collapse from "intervention bottom line" to "stop-loss gateway" In the past week, the yen experienced its most rapid appreciation since 2022. The dollar/yen fell through the critical support level of 155, briefly touching 152.89 on Tuesday, marking a seven-month high since mid-February. This level of 155 is significant because it had never been broken beforeeven when Japan's Ministry of Finance intervened with 15.4 trillion (approximately $98.6 billion) in May, it had remained intact. However, this time, driven by a market expectation that the probability of a rate hike by the Bank of Japan in September soared to 98%, along with hawkish comments from Bank of Japan Governor Kazuo Ueda and committee member Shinichiro Takeda, the 155 defense line collapsed without any official confirmation of intervention. This breakthrough triggered a large-scale chain reaction: short-sellers' stop-loss orders were triggered en masse, and market makers in the options market were forced to conduct reverse hedging, further accelerating a self-reinforcing cycle of yen appreciation. The "extreme pricing" in the options market: aggressive bets from 142.86 to 140 CME data reveals the aggressive nature of this round of yen-long trading. On Tuesday, the most actively traded dollar/yen options were a put option with a strike price of 142.86 expiring in Novemberindicating that investors buying this option are betting that the dollar/yen will fall below 142.86 before November. The total volume of puts expiring by year-end is over three times that of calls. More aggressive traders have extended targets to longer-dated options and lower price levels. Graham Smallshaw, a senior spot forex trader at Nomura Securities in Singapore, revealed that demand has spread to 12-month options, with some traders using digital options and other option spread strategies to lock in target price levels as low as 140. Digital options will pay a fixed amount if the price of the currency pair exceeds the preset level on expiration, allowing traders to gain leveraged returns in the event of significant yen appreciation. Wall Street's "institutional shift": Citi and Nomura synchronously confirm the trend reversal Jerry Minier, Global Head of G10 Currency Linear Trading at Citigroup in London, emphasized that this is not a simple tactical trade but a response to an institutional shift in the currency landscape: "Leveraged investors have been very active, and they are responding to this potential change in the currency dynamics. Options structures betting on the dollar/yen falling below 150 by year-end are quite popular. Minier specifically pointed out that the yen remained strong last week despite US non-farm payroll data far exceeding expectations (with 162,000 jobs added), greatly boosting investors' confidence in betting on further yen appreciation. Nomura Securities also observed a notable shift in the macro hedge fund community. Smallshaw stated, "There has been a significant increase in demand for puts from the macro group, as they have been adding to short positions, especially after breaking through 155, since most view 155 as a key support line." Although some profit-taking occurred when the currency pair fell below 153 on September 8, "the market is currently focused on the 150/152 target levels." Driving logic: rate hike expectations, unwinding arbitrage, and Beesons "insider trading" provocation The core driver of this round of yen surge is the market's reevaluation of the Bank of Japan's rate hike path. The overnight index swap (OIS) market indicates that traders have fully priced in the expectation of a 25 basis points rate hike on September 18. Goldman Sachs has significantly advanced the expectation of a rate hike by the Bank of Japan to September, with the terminal rate forecast raised to 1.75%. The rapid rise of the yen is triggering a broader chain reaction. Investors are massively unwinding yen funding arbitrage tradeswhich involve borrowing yen at low cost to invest in higher-yielding assets in other regions. It is estimated that following the dollar/yen falling below 155, short stop-loss orders and options hedges jointly triggered a large-scale sell-off of the dollar. More dramatically, U.S. Treasury Secretary Scott Beeson has issued a challenge to traders, daring them to counter his efforts to boost the yen and boasting that his market predictions "actually utilize insider information." This rare public statement further strengthened market expectations that U.S.-Japan policy coordination would support the yen. Upcoming tests: the September 18 Bank of Japan decision as a "watershed" The next steps for the market will become clear following the Bank of Japan's rate decision on September 18. The OIS market has fully priced in the September rate hike expectation, meaning the "surprise" effect of a rate hike has already been priced in by the market, significantly raising the bar for further strengthening of the yen. The greater risk is: if Ueda signals a dovish tone or suggests a prolonged wait-and-see period after the rate hike, it could trigger large-scale profit-taking, and the yen could come under renewed pressure. Conversely, if Ueda hints that the September rate hike is part of an accelerating tightening sequence and that further rate hikes may occur within the year, the yen is likely to rise further towards 150 or even lower. Rodrigo Catril, a strategist at the National Australia Bank, pointed out: "The yen is at a crossroads. An interest rate hike next week is a necessary condition, but to maintain the yen's recent uptrend, the Bank of Japan needs to release hawkish signals and reaffirm market expectationsthat is, the likelihood of another rate hike by year-end is greater than that of no hike."