On June 3, the USD/JPY exchange rate climbed to 160.44, establishing a new intraday high since July 2024, while the Nikkei 225 Index simultaneously surged past 68,000 points to reach 68,634.74. This divergence immediately reignited market fears of a carry trade unwind reminiscent of August 2024, yet the underlying data reveals a more complex reality. The most critical metric for assessing crowding in the yen carry trade is the Commodity Futures Trading Commission (CFTC) weekly report on non-commercial positions, which tracks speculative net exposure. As of the week ending May 26, non-commercial net short positions in yen futures stood at 114,667 contracts, comprising 112,993 long contracts against 227,660 short contracts. This represents an increase of 27,152 contracts from the previous week, indicating that global speculative funds are aggressively adding to their short positions rather than unwinding them.

Historical context highlights the counterintuitive nature of the current trend. In July 2024, when USD/JPY approached 161, the CFTC net short position was near the historical extreme of -180,000 contracts. Following an unexpected Bank of Japan (BOJ) rate hike and a miss in U.S. nonfarm payroll data in early August, these positions were forcibly liquidated, flipping the net position to over +177,000 contracts by the second quarter of 2025.

However, the trajectory since late 2025 has reversed this dynamic. Yen net shorts began accumulating again, turning negative in February 2026 and expanding rapidly to -102,000 contracts by April. Data compiled by Woofun AI shows that as USD/JPY revisited the 160 level, the net short position reached -114,667 contracts, confirming that the market is not de-risking but rather doubling down on the bet against the yen.

This accumulation creates a precarious setup for potential volatility. If the BOJ signals a more hawkish stance at its July meeting or if U.S. economic data unexpectedly weakens, these -114,667 net short positions could face passive liquidation pressure similar to the August 2024 squeeze. The Japanese Ministry of Finance is acutely aware of this risk, intervening between April 28 and May 27 with a record 11.7349 trillion yen to buy yen and sell foreign currencies. This operation, equivalent to approximately $73.6 billion, surpasses the total intervention volume of the entire year 2022 and exceeds the spring 2024 intervention by nearly 2 trillion yen. Despite this historic scale, USD/JPY breached the 160 level shortly after the disclosure, demonstrating the limitations of intervention in the face of persistent speculative pressure.

The resilience of the Japanese equity market amidst these currency dynamics presents a second layer of complexity. While the carry trade narrative suggests a sell-off, the Nikkei 225 is hitting new highs driven by distinct capital flows. foreign investors have been net buyers of Japanese stocks for 8 consecutive weeks as of May 23, purchasing 1.08 trillion yen in a single week. The year-to-date cumulative net purchase amount is approaching 11.7 trillion yen, a figure 15.8 times larger than the 742.1 billion yen recorded during the same period in 2025. Woofun AI notes that these inflows are highly concentrated in AI and semiconductor sectors, with SoftBank Group rising 17.62% and Socionext gaining 12.26% over the week, driven by Nvidia's performance outlook boosting demand prospects.

This dynamic stands in stark contrast to the August 2024 deleveraging event, which was characterized by indiscriminate selling and forced fund outflows. The current net foreign inflows in 2026 represent a proactive strategic choice to chase an AI-driven reflation rally rather than a reliance on low-cost yen funding. Consequently, the driving mechanisms differ fundamentally, leading to divergent implications for the Nikkei Index.

Furthermore, the market has shown resilience against the BOJ's tightening cycle. The policy rate has risen from -0.1% in March 2024 to 0.75% in December 2025, the highest level since 1995. While the July 2024 hike triggered a 12.4% single-day drop due to its coincidence with U.S. data releases, subsequent hikes in January and December 2025 saw the Nikkei climb from 40,000 to 68,634 points.

The correlation between rate hikes and stock performance has shifted because foreign inflows are now motivated by sector-specific growth rather than funding cost arbitrage.

However, this relationship remains conditional. If the BOJ pushes rates to 1.0% in the July meeting, supported by a 6-3 vote split where three members advocate for the hike, and the U.S. dollar weakens, financing costs could spike, potentially re-coupling the currency and equity trajectories. Woofun AI analysis suggests that while yen shorts remain crowded and intervention has failed to hold the 160 line, the simultaneous rise in Japanese stocks driven by AI funds creates a unique market state. These three facts—crowded shorts, failed intervention, and AI-driven equity rallies—coexist without immediate contradiction, yet none alone can predict the next market move.