Japan’s yen weakened to 160.44 per U.S. dollar on June 3, its softest level since July 2024, even as the Nikkei 225 pushed above 68,000 for the first time to close at 68,634.74. The sharp divergence between the currency and equities has revived talk of a potential collapse in yen carry trades, but current positioning, policy expectations, and equity flows point to a different setup than in 2024.
Speculative yen shorts build despite intervention
Data from the U.S. Commodity Futures Trading Commission show speculative short positions in the yen rose to 114,667 contracts in the week ending May 26, an increase of 27,152 from the prior week. That jump indicates that traders have been adding to bearish bets rather than scaling them back.
This build‑up stands in contrast to August 2024, when a surprise rate hike by the Bank of Japan triggered a violent unwind. At that time, yen futures swung from a net short position of about 180,000 contracts to a net long of 177,000 within a single quarter as carry trades were forced to reverse.
Since late 2025, short positions have again climbed steadily, surpassing 100,000 contracts by April. The data underline that speculative pressure on the yen remains elevated and has not meaningfully eased, even after repeated official action.
Record yen buying fails to halt slide
The Ministry of Finance mounted its largest-ever currency operation between April 28 and May 27, buying 11.7349 trillion yen, or around 73.6 billion U.S. dollars. The move exceeded even the 9.8 trillion yen intervention in spring 2024.
Despite the record scale, the yen slipped through the 160 per dollar level only days later, underscoring the limits of unilateral intervention when markets remain focused on interest rate differentials and carry opportunities.
History points to similar patterns. Dual interventions in September and October 2022 totaling 9.18 trillion yen briefly pushed the dollar‑yen rate down from 152 to 127 before the broader weakening trend resumed in subsequent months. The May 2026 operation has so far produced only a short‑lived bounce, echoing that earlier experience.
Volatility expectations rise as options hedging picks up
The yen’s repeated tests of the 160 threshold, a level that has previously drawn direct action from Tokyo, are driving a surge in currency hedging. Measures of expected yen volatility in the options market have climbed to their highest readings since October 2022.
That pickup in implied volatility reflects growing concern that official action or a policy shift could abruptly reverse the currency’s slide, catching leveraged positions off guard.
Foreign money powers Nikkei’s AI rally
While the currency has weakened, foreign participation in Japan’s stock market has strengthened this year. Exchange figures for the week ended May 23 show overseas buyers were net purchasers for eight straight weeks, adding 1.08 trillion yen that week. Cumulative net inflows in 2026 have reached about 11.7 trillion yen, roughly 15.8 times the amount recorded at the same point in 2025.
The bulk of these flows has targeted companies tied to artificial intelligence and semiconductors. Shares of SoftBank Group jumped 17.62% in the week to May 23, while chip designer Socionext climbed 12.26%. Both benefited from strong earnings from U.S. chip maker Nvidia and renewed optimism around AI‑related demand.
This pattern differs from the broad selloff that followed the 2024 carry trade unwind, when funding pressures forced widespread liquidation across Japanese assets. The latest rally instead reflects active appetite for high‑growth technology themes, rather than a flight from risk.
Early signs of cooling in equity inflows
More recent data suggest the pace of foreign buying may be easing. For the week ended May 30, overseas participants turned net sellers of Japanese equities for the first time since March, offloading 491.2 billion yen.
The shift comes as the Bank of Japan’s next policy meeting approaches and may indicate some capital is rotating or pausing after strong gains, even as the AI‑driven narrative remains dominant.
Rate expectations tilt toward July hike
The yen’s weakness is unfolding alongside rising expectations that the Bank of Japan will lift interest rates at its meeting ending June 16. Several market participants now see a hike as likely, driven by concern that higher energy prices and the weak currency are feeding into broader inflation.
Governor Kazuo Ueda has increasingly emphasized the need to contain inflation pressures. Derivatives pricing suggests markets assign a high probability to a move that would take the policy rate from 0.75% to 1.0%.
Minutes from the April 2026 meeting show three policy board members already supported raising the rate to 1.0%, though the decision to hold at 0.75% passed by a 6‑3 vote. That split signals a central bank edging closer to another step in its gradual normalization.
Inflation backdrop and global rate gap
Headline price pressures have cooled somewhat. The core consumer price index slowed to 1.4% in April, but underlying inflation measures and wage dynamics remain central to policymakers’ thinking.
The Bank of Japan continues to focus on creating a durable cycle of wage and price gains. Upcoming wage data will be key to whether the board feels able to tighten further without derailing domestic demand.
At the same time, the interest rate gap with other major economies remains wide. The U.S. Federal Reserve is expected to keep its key rate unchanged for the rest of 2026 amid its own inflation concerns. That divergence keeps the yen attractive as a funding currency for carry trades and is a major structural driver of its weakness.
Equities respond differently to rate hikes than in 2024
The relationship between Bank of Japan rate changes and equity performance has evolved. When the central bank raised its policy rate to 0.25% in July 2024, the Nikkei 225 dropped 12.4% in a single session as markets adjusted to the end of an era of negative rates.
However, subsequent increases in January and December 2025, to 0.5% and 0.75% respectively, coincided with the index grinding higher and eventually breaking through 68,000. That shift suggests traders now see moderate tightening as consistent with ongoing earnings growth, particularly in export‑oriented and technology sectors.
Carry trade risk: similar tension, different mix
With yen shorts elevated, the largest‑ever currency intervention spent, and equity gains driven by foreign demand for AI‑linked names, Japan’s markets present a complex backdrop ahead of the June policy decision.
A sharper-than-expected move from the Bank of Japan, or a weaker U.S. dollar, could again squeeze heavily leveraged short positions, echoing the funding stress of 2024. The dollar‑yen rate remains a key reference point for global risk appetite, as many strategies rely on cheap yen funding.
For traders and asset managers exposed to global capital flows, the main risk is not the current weakness of the yen but the possibility of a sudden reversal. Any swift strengthening in the currency could force a rapid unwinding of carry trades that have benefited from its decline.
In that scenario, volatility would likely extend beyond foreign exchange into Japanese equities, credit, and potentially other asset classes tied to global risk sentiment, testing the resilience of a rally that has so far been powered by confidence in Japan’s technology story and a still‑accommodative policy stance.
Learn how rate differentials fuel currency and equity moves—explore carry trading dynamics in volatile macro environments.
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