Yen surges 2.7% in biggest rally since 2022 as carry trades unwind

The yen's 2.7% surge against the dollar is its sharpest rally in three years, threatening to upend the global carry trade.

The yen strengthened 2.7% against the dollar on Thursday, its largest single-day gain since December 2022, as a sudden wave of buying swept through currency markets. The dollar-yen pair fell sharply during Asian trading hours, with stop-loss orders triggered as the move accelerated through key technical levels.

The move comes as Japan's government cut its economic growth outlook for the current fiscal year, citing higher energy costs that have weighed on the nation's economy, according to the Cabinet Office's latest quarterly report. Japan, which imports most of its energy needs, has faced persistent cost pressures from elevated global oil and gas prices, squeezing corporate margins and household spending.

The dollar-yen pair's 2.7% decline marks the sharpest single-session move since the Bank of Japan's December 2022 decision to widen its yield curve control band, which sent the yen surging against the dollar. Thursday's move threatens to unwind billions of dollars in yen-funded carry trades, where investors borrow at Japan's low rates to invest in higher-yielding assets abroad.

A sustained yen rally would erode returns on these carry positions, potentially triggering forced selling of risk assets from emerging-market currencies to global equities. The move also raises speculation about whether the Bank of Japan may be shifting its policy stance, with traders watching for any official commentary from the central bank.

The Bank of Japan has maintained its ultra-loose monetary policy even as other major central banks have tightened, keeping Japanese government bond yields near zero and making the yen a primary funding currency for global carry trades. The BoJ's policy rate stands at minus 0.1 percent, the lowest among developed economies, while the Federal Reserve's benchmark rate remains elevated by comparison. This rate differential has kept the yen under sustained pressure, with the dollar-yen pair trading well above levels seen before the current tightening cycle began.

The cross-asset implications extend across multiple markets. The US Dollar Index came under pressure as the yen's surge accounted for nearly 14 percent of the index's composition. Gold prices edged higher as the dollar weakened, with the precious metal benefiting from the flight to safety. Emerging-market currencies that have benefited from carry trade flows could face selling pressure as those positions are unwound. In equity markets, Japanese exporters that benefit from a weak yen may see their shares decline as currency tailwinds reverse. Cryptocurrency markets, which have also attracted speculative flows, could see selling pressure as liquidity is withdrawn from risk-on assets.

In fixed-income markets, Japanese government bond yields could rise if the BoJ signals a policy shift, potentially triggering a repricing that would ripple through global bond markets given Japan's status as a major holder of US Treasuries. Any reduction in Japanese demand for foreign bonds would add upward pressure on long-term US yields, further tightening financial conditions worldwide.

The last time the yen posted a comparable single-day gain was in December 2022, when the BoJ's surprise yield curve control adjustment caught markets off guard. In the weeks following that move, Japanese equities declined while the dollar-yen pair stabilized at significantly lower levels. A repeat of that scenario would have major implications for Japanese equities and global risk appetite.

The BoJ's next policy meeting is scheduled for September, where markets will look for any signals on rate normalization. Any shift in the central bank's ultra-loose monetary stance could accelerate the yen's rally and deepen the carry trade unwind, with ripple effects across global financial markets.

This article is for informational purposes only and does not constitute investment advice.