Hedge funds face yen volatility as Japan holiday thins trading after BOJ hike
Hedge funds and other currency traders face heightened volatility in the yen this week as Japan’s three-day market holiday reduces liquidity just as investors reassess the outlook for Bank of Japan interest-rate increases and the possibility of further government intervention, according to a report by Bloomberg.
Currency traders and hedge funds face heightened volatility in the yen this week, according to a Bloomberg report. The yen traded around JPY156.85 to the dollar on Monday, having lost about 2% last week. Japanese markets will be closed Monday to Wednesday for the Silver Week holiday, leading to thinner liquidity for trading. The Bank of Japan raised its policy rate to 1.25%, the highest level in over 30 years, but the move did not result in a sustained yen rally.
Two policymakers opposed the increase, while Governor Kazuo Ueda offered limited guidance on future tightening. Initially, the yen faced renewed pressure following the decision, but reports of Japanese officials conducting a "rate check" helped reinforce speculation that authorities remain prepared to act in the foreign-exchange market.
Given the combination of reduced liquidity and intervention risk, moves in the currency could become more abrupt for those managing yen positions. Japan has previously used the market to support the yen, and US and Japanese authorities have intervened together earlier this year. The yen strengthened during the first part of September as traders anticipated faster Bank of Japan tightening and unwound some yen-funded carry trades.
However, that rally has reversed, prompting renewed focus on the central bank's ability to deliver enough policy tightening to narrow the interest-rate gap with the US. Speculators boosted their net long-yen exposure to $9.7 billion in the week to September 15, the highest level since July 2025, based on US regulatory data. This build-up occurred just before the Bank of Japan meeting, leaving traders exposed if the yen resumes its decline.
The Federal Reserve's own policy stance also weighs on yen traders, as the Fed signals further tightening, potentially leading to higher US rates even as the Bank of Japan proceeds cautiously. This relative policy outlook has contributed to ongoing pressure on the Japanese currency.
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