The opening scene of the Tokyo stock market on August 5, 2024, still haunts traders in their nightmares.
The Nikkei 225 index plummeted 12.4% in a single trading day—the most severe one-day crash since Black Monday in 1987. The Seoul KOSPI triggered a circuit breaker, halting trading. The Chicago VIX fear index soared to 65, wiping out trillions of dollars in market capitalization across the Asia-Pacific region within 48 hours.
The trigger was a 25-basis-point interest rate hike by the Bank of Japan.
Now, 22 months later, the Bank of Japan is about to raise rates by another 25 basis points, pushing the interest rate to 1%—the highest level since 1995. CFTC data shows that speculative net short positions on the yen have returned to $10.1 billion, exactly matching the levels seen just before the stampede in July 2024.
However, this time, the market's real anxiety isn't about the rate hike itself. All 49 out of 49 economists surveyed predict a hike, leaving zero suspense.
What's causing the tension is this: after this rate hike, it won't be Governor Kazuo Ueda standing at the press conference podium.
Ueda's Absence: Who Will "Translate" This Rate Hike?
On June 10, Bank of Japan Governor Kazuo Ueda was hospitalized due to a liver cyst infection, with an expected recovery period of two weeks. He will be absent from the June 15-16 policy meeting—not attending, not voting, not chairing the discussion, only submitting a written opinion.
This marks the first time since 1998 that a Bank of Japan Governor has missed a policy meeting.
The backup arrangement is also unprecedented: Deputy Governor Ryozo Himino will chair the meeting discussion and vote, while Deputy Governor Shinichi Uchida will preside over the post-meeting press conference. Two deputy governors sharing the role of one governor is something the Bank of Japan has never done before.
For the market, the text of the rate hike decision is unimportant—everyone knows it will say "hike by 25bp to 1%." What matters are the 45 to 50 minutes of Q&A at the press conference.
The information content of central bank press conferences has never been in the statement text itself, but in the governor's wording, tone, pauses, facial expressions, and subtle responses to pointed questions like "Will there be further rate hikes?" Investors have spent three years learning how to interpret Kazuo Ueda's communication code.
Now, the codebook has changed hands.
Shinichi Uchida: The Last Time He Stepped Up, It Was to Douse Flames
Shinichi Uchida has a clear label in market memory: the dovish firefighter.
On the third day after the Japanese stock market crash on August 5, 2024, it was Uchida who stepped forward with crucial reassurance. He uttered one sentence that immediately halted the market's decline and sparked a rebound: "We will not raise interest rates when financial markets are unstable." Within 48 hours, this statement pulled the Nikkei 225 back from the brink of collapse.
The market remembers two things: Uchida leans dovish, and Uchida can put out fires.
But his role on June 16 is entirely different. He is not there to douse flames; he is there to "explain" a rate hike that has already been decided. Reporters will ask him: Will there be another hike by the end of the year? Is a path to 1.25% already set? How are economic downside risks assessed?
If Uchida's answers are more dovish than Ueda's usual rhetoric—for example, hinting that "there is no rush for further hikes at present"—the market will immediately face an unanswerable question: Is this Uchida's personal style, or a shift in the Bank of Japan's policy stance?
A Bloomberg report used an accurate description: "adds a layer of ambiguity."
There is another factor rarely discussed publicly: Uchida was just discharged from the hospital last month after treatment for leukemia. A high-pressure press conference lasting nearly an hour, facing sharp questions from global financial media, will be a test of his physical stamina and mental energy.
Positions Are Back, But the Safety Cushion Is Half as Thick
CFTC yen speculative net short positions at $10.1 billion. This number alone is an alarm bell.
The last time positions were at this level was in late July 2024—which was followed by the Nikkei's largest single-day plunge since 1987.
But CFTC data is just the tip of the iceberg. It only covers a small portion of exchange-traded futures. According to BIS statistics, the total size of the yen swap market against other currencies is approximately $14 trillion. Morgan Stanley estimates that around $500 billion in carry trade positions remain outstanding. BCA Research is more direct—they call the yen carry trade "a ticking time bomb."
But position size is only half the story. What's more critical is the change in the safety cushion.
In mid-2024, the US-Japan interest rate differential was 515 basis points. At that differential level, for a carry trade to erase a year's worth of carry income, the yen would need to appreciate more than 4% per month. Now, with the differential narrowed to 275 basis points (after the hike to 1%), the yen only needs to appreciate 2.8% per month to wipe out the annual return.
The profit logic of the carry trade hasn't changed—a positive carry of 275bp is still profitable. But the margin for error has shrunk by nearly half. The same magnitude of yen appreciation, which in 2024 was just an "uncomfortable pullback," could directly turn into a loss in 2026.
If 79% of economists are correct (another hike to 1.25% by year-end), the differential will narrow further to 250bp. The safety cushion will become even thinner.
Will August 2024 Repeat Itself?
The market's greatest fear is a "repeat of August 2024." But fear aside, a calm disassembly of the conditions leads to a less extreme conclusion.
The August 2024 stampede required three simultaneously satisfied necessary conditions:
The first condition was an unexpected rate hike. On July 31, 2024, the BOJ hiked by 25bp, with market expectations split and the hawkishness exceeding forecasts. Governor Ueda's tough rhetoric at the press conference that day amplified the shock. This condition is not met today—49/51 economists expect a hike, and the OIS market has fully priced it in.
The second condition was simultaneous recession signals from the US economy. On August 2, 2024, just two days after the BOJ hike, US non-farm payroll data disappointed badly—adding only 114,000 jobs (versus an expectation of 175k), with the unemployment rate rising to 4.3%, triggering the Sahm Rule. Within a trading day, the market narrative shifted from "BOJ's surprise hike" to "global recession panic." The superposition of these two panics caused the stampede to spiral out of control. This condition is also not met today. May non-farm payrolls came in at 172,000, significantly exceeding market expectations of 85,000, indicating a robust labor market.
The third condition was highly concentrated carry trade positions with insufficient hedging. In 2024, a BIS review pointed to high leverage, low hedging, and margin calls triggering a self-reinforcing unwinding spiral. This condition is partially met today—CFTC positions have returned to the same level, but after the 2024 stampede, some institutions increased hedging, potentially making the position structure more dispersed than back then.
Only about one of the three conditions is met. The probability of a complete repeat of August 2024 is not high.
But this doesn't mean the risk is zero. The lesson from August 2024 is not just "what happens when three conditions are met simultaneously," but also that "in a high-position environment, a communication mishap can trigger localized unwinding, which then self-reinforces."
Today's risk takes a different form: uncertainty triggered by the press conference could lead to a 5-10% position adjustment, which market microstructure could then amplify into larger volatility.
275 Basis Points: How Long Can It Last?
Taking a step back from the press conference, a more structural issue is emerging.
It took less than two years for Japan's policy rate to move from 0% to 1%. If it reaches 1.25% by year-end, the era of Japan as the world's cheapest source of funding—an era that lasted nearly 30 years—is accelerating towards its end.
This isn't just a numerical change.
The underlying logic of the yen carry trade is "Japanese interest rates are forever low, the yen is forever weak." This assumption has never been seriously challenged over the past 30 years. But as rates rise from 0% to 1%, potentially 1.25% by year-end, and the carry narrows from over 500bp to 250bp, the foundation of this assumption is being chipped away, shovel by shovel.
The broad yen funding scale—Japanese bank loans to offshore entities—totals about 1420 trillion yen, equivalent to 236% of Japan's GDP. These funds won't be withdrawn overnight because of one press conference. But once the trend of interest rate normalization is established, each rate hike raises funding costs, shrinks the carry space, and forces the weakest marginal positions to exit.
This is a slow-moving variable. The June 16 press conference is a fast-moving variable. The combination of the two constitutes the true risk structure of this BOJ meeting.
The Two Hours After the Press Conference: What to Watch and How
Around 11:00 Beijing time on June 16, the BOJ will announce its rate hike decision. This step holds no surprises.
The real pricing window opens around 14:30—the press conference chaired by Uchida.
The market will look for three signals from the press conference.
Whether there is room for further rate hikes within the year—If Uchida says "adjust gradually based on economic and price developments," consistent with Ueda's previous stance, the market will read it as "successful communication." If he says "there is no rush for further action at present," the market will be confused.
Assessment of economic risks—The Iran conflict has pushed up energy inflation, and the ECB has already hiked rates in response. How Uchida assesses inflation risks will influence market expectations for the BOJ's rate hike path.
Wording on financial market stability—The statement Uchida made in August 2024, "we will not raise rates when markets are unstable," has become a signature stance. If he repeats a similar expression this time, the market will read it as "the safety valve is still in place"; if he doesn't mention it, the market will speculate whether the safety valve has been removed.
In the first two hours after the press conference, watch USD/JPY. The yen's movement is the "switch" in the entire transmission chain.
If the yen's appreciation is contained within 1%, it will likely be just a mild adjustment, with the carry trade digesting it in an orderly manner. Asia-Pacific markets and emerging market currencies should not see significant spillover effects.
If the yen appreciates more than 1.5%, the South Korean KOSPI will likely follow with a 2-4% decline. The experience of August 2024 shows that South Korea is the first stop in the Asia-Pacific transmission chain—due to concentrated foreign holdings and export competitiveness directly linked to the yen. Also watch for reverse movements in carry trade target currencies like the Indonesian rupiah, Mexican peso, and Brazilian real.
If the yen appreciates more than 3%—a low probability but not zero—it enters the range of systemic deleveraging. The Nikkei could fall 3-5%, the VIX could jump to 25-30, and the Nasdaq would also face pressure.
The direction of the US 10-year Treasury yield is more complex: safe-haven flows would buy US Treasuries (pushing yields down), but carry trade unwinding itself might involve selling US Treasuries (pushing yields up). These two forces hedge each other, making the short-term direction uncertain.
June 20: The Moment of Verification
After the June 16 press conference, the market will enter a "waiting for verification" window.
The CFTC Commitment of Traders report released on June 20 (covering data up to June 17) is key. If net short positions decrease significantly—for example, falling below $8 billion—it would indicate that carry traders actively reduced positions around the BOJ meeting, lowering the risk of a stampede. If positions remain largely unchanged or even increase, it suggests the market is "holding on," and the potential destructive power of the next shock would be greater.
After that, watch two time points: Japan's May CPI data on June 20 (if inflation accelerates, expectations for further hikes will strengthen), and Governor Ueda's first public statement after his discharge from the hospital (expected in mid-July).
When the carry safety cushion is as thin as 275bp, the governor is absent, and positions are at dangerous levels, that 45-minute press conference starting at 14:30 on June 16 could be the most critical 45 minutes for global financial markets to watch this year.
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