Japan’s carry-trade unwind is not done. The yen tells you when.
USDJPY at 157.20 is 4 yen from the MOF's implicit intervention threshold. With Ueda's BoJ signalling October hike, the carry-trade unwind that started in August 2024 has another leg to go.
July 2026 Update: The scenario this piece flagged has played out. The BoJ delivered a 25bp hike, taking its policy rate to 0.75% — the highest level in three decades — and the carry-trade unwind that followed has been violent: USDJPY has fallen from the 157 handle to around ¥147.64, down more than 6% over the past month alone. CFTC data showed leveraged funds’ bearish-yen bets had swelled to over 115,000 contracts by June 9, 2026, the highest level since November 2017, setting up exactly the kind of squeeze this piece warned about. The unwind since then has been fast: Goldman Sachs estimates roughly 90% of that speculative short-yen positioning has already reversed. JPMorgan is more cautious, putting the broader unwind — including the structural pension and insurer hedging flows — at only 50% to 60% complete, calling it “not finished, by any means.” That gap between the two views is now the central question for crypto and duration positioning.
USDJPY was last trading around ¥147.64, up 0.3% on the session but still more than 6% lower over the past month, as the market continues to digest the BoJ’s rate hike and the unwind of the yen-funded carry trade it triggered. That is a world away from the 157-160 range this trade was anchored in for most of 2024 and 2025, and it confirms that the fault line flagged back then — the gap between BoJ guidance and market pricing — has finally given way. The question now is not whether the unwind happens, but how much of it is left to run.
What was at stake was the unwinding of an estimated $20 trillion structural short-yen position built over a decade and a half of zero rates. The August 2024 unwind — when USDJPY dropped from 161 to 142 in three weeks and the Nikkei fell 12% in a single session — was, at the time, the most violent single-asset deleveraging since the 1998 LTCM crisis. The IMF and BIS estimated that roughly $400-500bn of carry-trade exposure was unwound in that episode, against a total estimated short-yen position of $20tn across hedge funds, mutual funds, official sector reserves, and Japanese household FX deposits — under 3% of the position at the time. The move since has been far larger: with speculative short-yen positioning down roughly 90% by Goldman’s estimate, and JPMorgan pegging the all-in unwind at 50-60% complete, a much larger share of that $20tn book has now moved than in the August 2024 episode alone.
The Ueda communication strategy is deliberately ambiguous
Governor Ueda’s Tokyo Foreign Correspondents’ Club address argued that “underlying inflation has been gradually heading toward the price stability target” and that “the conditions for policy normalisation continue to be met.” That guidance has now been borne out: the BoJ went on to deliver a 25bp hike to 0.75%, the highest policy rate in three decades. The ambiguity was the policy. Excessive precision on the timing would have triggered the carry-trade unwind in advance and forced MOF intervention to manage the pace of dollar-leg depreciation. By keeping the timing fuzzy, Ueda preserved optionality and let the market do the work of pricing in the move — and once it arrived, the unwind it produced has been the sharpest since 2024.
The complication at the time was that the Federal Reserve had shifted dovish on a similar timeline, narrowing the rate differential that drives USDJPY from both ends — BoJ rising, Fed falling. That combination is a large part of why the unwind, once it started, moved so fast. Speculative positioning data from the CFTC Commitment of Traders report showed leveraged funds’ bearish-yen positions rising to over 115,000 contracts as of June 9, 2026 — the highest level since November 2017 — before the subsequent decline in USDJPY forced a large share of that positioning to close out.
The MOF intervention math
Japan’s Ministry of Finance held roughly $1.27 trillion in foreign currency reserves per its most recent disclosure at the time, of which roughly $1.05 trillion was in US Treasuries and dollar deposits — the war chest built to defend the yen against excessive weakness. The April 2024 intervention spent approximately $62bn over two trading days to defend the 160 level; the May 2024 intervention spent approximately $36bn defending 161. That defense zone is now moot: with USDJPY back near ¥147.64, the currency has moved well through the levels MOF was defending, driven by the carry-trade unwind itself rather than by intervention. The playbook that mattered this time was not yen-buying at round numbers — it was the BoJ’s rate hike removing the reason to be short yen in the first place.
| Episode | Date | USDJPY peak | Est intervention spend | Effect (30d) |
|---|---|---|---|---|
| Black Wednesday TMS | Apr 29 2024 | 160.20 | ~$36bn | USDJPY -2.8 yen |
| Second intervention | May 1-2 2024 | 161.95 | ~$26bn | USDJPY -4.6 yen |
| August unwind | Aug 5 2024 | 146 (low) | $0 (market move) | USDJPY -15 yen in 3 days |
| Q4 2024 stealth | Oct-Dec 2024 | 156 | ~$18bn (suspected) | USDJPY -2 yen |
| Spring 2025 | Apr 2025 | 158 | ~$22bn | USDJPY -3 yen |
The structural short positioning is the issue
The carry trade has multiple layers. The top layer is speculative — leveraged funds and prop shops borrowing yen at near-zero rates and parking it in higher-yielding dollar, Mexican peso, Brazilian real, and Turkish lira assets. That layer is reflected in CFTC data and unwinds first under stress; it is also the layer Goldman estimates is roughly 90% unwound as of this update. The middle layer is Japanese retail FX margin accounts at Gaitame Online and similar venues, which historically run heavily long USDJPY and capitulate in cascading stop-loss waves when the cross moves sharply in a session. The bottom and largest layer is structural: Japanese pension funds (GPIF, Pension Fund Association), life insurers (Nippon Life, Dai-ichi Life), and corporate treasuries holding hundreds of billions in unhedged or partially hedged foreign assets to capture the yield differential.
The structural layer is the dangerous one. It does not unwind on a daily basis — it unwinds once the BoJ raises rates enough that the cost of hedging FX exposure exceeds the additional yield earned on the foreign asset. That threshold was estimated at around 75bp of BoJ policy rate — and with the BoJ now at 0.75%, that level has effectively been reached. This is the basis for JPMorgan’s view that the unwind is only 50-60% complete rather than finished: the leveraged, speculative layer has moved the most (per Goldman’s ~90% figure), but the pension and life-insurance hedging programmes that ramp up mechanically once the rate threshold is crossed are only now getting underway. The August 2024 episode was the leveraged layer panicking; the structural unwind is the one still in progress.
The Nikkei is doing the early signalling
Japanese equities have remained volatile through the unwind, and the dispersion between the Nikkei 225 and the S&P 500 continues to be one of the cleanest early-warning signals for carry-trade stress at the speculative layer. Japanese equities are typically a long-yen-funding trade for global allocators — funds borrow yen, buy Japanese equities, and earn the difference between equity returns and the funding cost. When the funding side gets uncertain, as it has with the BoJ hike and the sharp move in USDJPY, those positions unwind regardless of the fundamentals on the equity side. Watch the Topix banks index relative to the broader Topix: underperformance there, even as the BoJ turns more hawkish, is the tell that the marginal seller is reducing yen-funded exposure across the board rather than repricing for higher rates.
The cross with US equities still matters. In August 2024 the Nikkei led the S&P 500 by approximately 24 hours into the unwind. With the structural layer of the carry trade now engaging per JPMorgan’s 50-60%-complete estimate, that lead indicator is worth watching again — particularly on any session where USDJPY moves sharply against the current ¥147.64 level. A continuation of yen strength from here would likely coincide with renewed Nikkei weakness and a fast read-across to global risk assets.
What this means for crypto and global duration
The August 2024 carry-trade unwind took Bitcoin down 18% in three sessions, despite no Bitcoin-specific catalyst. The mechanism was deleveraging — funds unwinding yen-funded long positions sold whatever was liquid, and BTC was among the most liquid risk assets in the global book. The same dynamic has applied in 2026: BTC is now meaningfully more institutional than it was in 2024 and therefore more correlated to the equity tape that gets hit first. With JPMorgan arguing the unwind is only 50-60% complete, the risk of further BTC underperformance on a beta basis has not passed just because the most visible leg of the move — the 6%+ drop in USDJPY over the past month — has already happened. A hedge against continued yen strength, sized to the position rather than to a specific option strike now that USDJPY has already moved well through prior reference levels, remains the cleanest way to carry that tail risk.
The duration read-across is the opposite direction. A yen-strength episode is typically associated with global risk-off, which is positive for long-duration Treasuries through the safe-haven channel. The 30-year Treasury rallied 22bp during the August 2024 unwind in three sessions. With the BoJ hike now delivered and the carry trade unwinding in earnest, the setup for a further Treasury rally into the structural phase of the move — the one JPMorgan sees as still 40-50% outstanding — remains intact, though a large share of the speculative-layer move (per Goldman’s ~90% figure) is already behind us and priced.
What to watch next
Three things. First, further BoJ communication on the pace of policy normalisation from here — with the 0.75% rate now crossing the estimated threshold for structural hedging programmes to engage, any signal of additional hikes would accelerate the pension and life-insurer flows that JPMorgan says are still largely outstanding. Second, MOF’s FX reserve disclosures — a meaningful jump rather than a drawdown would suggest Japan is managing the pace of yen strength rather than just its weakness, a reversal of the 2024-25 dynamic. Third, the cross-currency basis on 3-month JPY funding, which is the cleanest read on whether the structural hedging programmes are accelerating or have largely finished repositioning.
For risk-asset positioning, the split between Goldman’s ~90%-complete view on speculative positioning and JPMorgan’s 50-60%-complete view on the broader unwind is the trade. If JPMorgan is right, the structural layer still has room to run and further yen strength — with knock-on pressure on BTC and other liquid risk assets, and support for long-duration Treasuries — is the base case. If Goldman is closer to right, most of the move is already in the ¥147.64 print and further USDJPY downside should be more gradual than violent. Track BoJ communications, MOF reserve data, and the Nikkei tape on our events calendar and the live yen and curve data in the market hub.
The honest read: the August 2024 unwind was the appetiser, and the BoJ’s move to 0.75% in 2026 was the main course. The full carry-trade rebalancing still has not finished — JPMorgan puts it at 50-60% complete even after a 6%+ monthly drop in USDJPY — and the remaining structural leg will likely play out across the rest of the BoJ’s rate normalisation cycle. Each step of that path is a yen-positive catalyst, and each catalyst has the potential to compress risk-asset prices globally. Position with that asymmetry in mind. The yen tells you when. The Nikkei tells you it has started.