The Japanese yen surged more than 5 yen against the US dollar in just two days, its fastest strengthening in months, as traders priced in aggressive Bank of Japan rate hikes and growing speculation that Japan’s Government Pension Investment Fund will shift toward domestic bonds.
The yen climbed to as high as 155.3 per dollar on Thursday, its strongest level in a month, up from 160.39 on Tuesday. That represents a gain of more than 5 yen, or 3.2%, in just two trading sessions, according to Seoul Economic Daily.
BOJ hawk signals bigger step
The immediate trigger came from Hajime Takata, a Bank of Japan policy board member and a leading hawk, who said there is no need to fix the size of rate increases at 0.25 percentage points. He raised the possibility of a big step, a move that would lift the benchmark rate by 0.50 percentage points at once.
That comment sent shockwaves through currency markets around the world. Nomura Securities projected that the Bank of Japan could raise rates three times in a row through December. JPMorgan Chase estimated that yen short positions amount to 16 trillion to 17 trillion yen and warned that a move below 155 could trigger unwinding that accelerates the currency’s strength.
The risk of a short squeeze is real. Carry trade positions built on interest rate differentials, in which traders borrow cheaply in yen to invest in higher-yielding assets elsewhere, are showing signs of being unwound. If the 155 line breaks, the chain reaction could push the yen significantly higher in a short period, forcing traders to cover their positions at increasingly unfavorable exchange rates.
Japan’s 30-year government bond yield hit 4.21% this week, its highest level on record, reflecting expectations that the BOJ will continue tightening monetary policy well into next year. The 10-year yield eased slightly to 2.91% on Thursday but remains elevated compared to the levels seen earlier in 2026.
Fed signals caution on rate hikes
Adding fuel to the yen’s rally, influential figures at the US Federal Reserve voiced caution about raising rates one after another. Federal Reserve Governor Christopher Waller said on Wednesday that signs of disinflation are appearing and that he would support holding rates steady if data over the next two weeks continue along the same path.
Waller noted that the three-month average rate of core price increases, excluding food and energy, had come down from 4.76% in February to 3.05%. He said a three-month core inflation rate of 2.8% is an acceptable level. He drew a line, however, saying a hike could be appropriate at the September FOMC meeting if August data released on the 11th shows the slowdown was temporary.
His remarks followed a similarly cautious tone from New York Federal Reserve President John Williams the day before. The combined dovish pivot from two senior Fed officials narrowed expectations for a September rate increase. Based on the CME FedWatch tool, the probability of a 0.25 percentage point increase in September fell from 63.2% to 50.5% in just a single trading day.
The convergence of BOJ hawkishness and Fed caution has created a powerful setup for yen strength. If the Bank of Japan does raise rates while the Fed holds steady, the interest rate differential that has kept the yen weak for years will narrow rapidly.
GPIF speculation adds another layer
Separately, speculation that Japan’s Government Pension Investment Fund, the world’s largest pension fund with approximately $1.6 trillion in assets, will expand its yen-denominated holdings has added another layer of support for the currency. While no official announcement has been made, market participants are pricing in a potential shift that would see GPIF reduce its foreign bond allocation and increase domestic purchases.
Such a move would represent a significant change in fund strategy and would put additional upward pressure on Japanese government bond prices while strengthening the yen further. The GPIF has historically maintained a substantial allocation to foreign assets, and any reversal would have major implications for global capital flows and currency markets.
What it means for markets
The yen’s rapid appreciation has implications well beyond currency traders. A stronger yen makes Japanese exports more expensive, potentially squeezing corporate profit margins for companies like Toyota and Sony. It also affects the cost of importing energy and food, which could ease some inflation pressures in Japan but hurt purchasing power for domestic consumers.
For global markets, the unwinding of yen carry trades could trigger volatility across emerging markets and risk assets. The 2024 carry trade unwind, which followed a surprise BOJ rate hike, sent shockwaves through crypto and equity markets. A repeat, if the yen breaks below 155, could follow a similar pattern of forced selling across multiple asset classes simultaneously.
The yen’s trajectory will depend heavily on the next two data releases: August CPI data from Japan and the September 11 US inflation report. Both will shape whether the BOJ and Fed move in opposite directions, a scenario that would accelerate the yen’s gains and potentially disrupt carry trade positions that have been built over several years.
For now, the market is betting that the era of ultra-cheap yen borrowing is ending. The question is whether the unwind happens in an orderly fashion or in the kind of sharp, volatile move that rattles markets from Tokyo to New York.
discussion