Bank of Japan's Rate Hike "Fizzles Out," Yen Bullish Bets Face a Major Test

Monday saw the yen stabilize after a sharp selloff last week that sparked intervention concerns. Investors are still assessing the global interest rate outlook after major central banks raised rates and struck hawkish tones this month. The yen traded at 157.04 per dollar, having fallen 2% last week. Japanese markets were closed for a three-day holiday, keeping liquidity thin and traders on alert for official intervention. The Bank of Japan raised rates to 1.25% on Friday, the highest in 31 years, but the widely expected hike failed to lift the yen. Two dissenting votes and a lack of clear hawkish guidance disappointed investors. That drove a sharp yen slide, after which foreign media reported that Japanese officials conducted rate checks, typically seen as a precursor to currency intervention. Beyond the BOJ, the Federal Reserve and the European Central Bank also hiked rates this month and warned that further tightening may be needed to counter inflation, as the Middle East war has dragged on for nearly seven months. HSBC chief Asia economist Fred Neumann said the BOJ's communication challenge has been made harder by the Fed's unanimous rate hike, which sent a hawkish signal. "The bar remains high for the BOJ to convince markets of its hawkish lean and anchor expectations on the yen," he said. "In the coming weeks and months, investors may once again test the BOJ's resolve to keep raising rates and follow the Fed's tightening pace." Bullish yen bets face a test In early September, traders bet the BOJ would accelerate rate hikes and early signs of Japanese capital repatriation emerged, briefly pushing the yen to its strongest level in seven months, though it has since given back some gains. Positioning data showed investors grew more bullish on the yen before the BOJ meeting. Weekly U.S. regulatory data showed speculative accounts added to net long yen positions in the week to Sept. 15, with net long exposure rising to $9.7 billion, the largest since July 2025. Thomas Mathews, head of Asia-Pacific markets at Capital Economics, said that despite the BOJ hike, the market clearly sees the Fed as the more hawkish of the two, at least relative to expectations at the start of the month. "Still, given the yen is already notably stronger than before, it may need to weaken further before intervention comes back onto the agenda," he said. In July, the yen fell to a four-decade low of 163.99 per dollar, after which a rare coordinated U.S.-Japan intervention helped lift the currency. Focus shifts to Fed rate outlook The dollar index, which tracks the greenback against six major currencies, held steady at 100.23. It rose more than 1% last week after the Fed hiked rates and signaled possible further tightening. The CME FedWatch tool shows traders now price a 55% chance of a Fed rate hike at its next meeting in October, up from 42.5% a week earlier. "We do not think the midterm elections will be a constraint on another Fed hike in October," said Thomas Simons, chief U.S. economist at Jefferies. "Whether there is another hike in December will depend on data and geopolitical developments. Looking into 2027, the rate path will depend on labor market performance. We think rate cuts are possible in the second half of 2027." The euro traded at 1.1474 against the dollar, little changed. Earlier voting projections showed the far-right Alternative for Germany (AfD) finishing first in a state election in northeastern Germany, dealing a blow to Chancellor Friedrich Merz's conservative party.