Japan's Carry Trade Unwind Isn't Over

In early August 2024, a two-day move in the Japanese yen triggered one of the sharpest risk-off episodes in recent market history. The yen rallied sharply against the dollar, Japanese equities fell more than 12% in a single session, and global risk assets sold off hard as leveraged yen-funded positions were unwound in forced deleveraging. By the end of the week, markets had stabilized. By the end of the month, the episode was being characterized as a technical dislocation that had been resolved.

That characterization was wrong. The carry trade did not unwind. A small piece of it unwound. The structural position remains, and the conditions that produced the August 2024 episode are still intact, with the added variable that Japanese monetary policy has continued to drift toward normalization without resolving the underlying imbalance.

The market is not positioned for another episode. It should be.

The Size of the Position

The Japanese yen carry trade is not a single trade. It is a constellation of positions that share one characteristic: they use yen as funding currency. Japanese investors hold foreign bonds, equities, and real assets financed effectively by yen liabilities. Global hedge funds borrow in yen to buy higher-yielding assets denominated in dollars, euros, and emerging market currencies. Corporate treasuries fund dollar operations with yen debt. The aggregate position is enormous, and because it is distributed across thousands of entities using different instruments, it is genuinely difficult to size.

Estimates from the Bank for International Settlements and various sell-side research desks place the total notional exposure at somewhere between $4 trillion and $10 trillion. The range is wide because much of the position is synthetic, embedded in derivatives, or conducted through offshore vehicles. But the order of magnitude is not controversial. The yen carry trade is one of the largest macro positions in global financial markets, and it has been growing for more than a decade.

What makes it fragile is its asymmetry. Carry traders earn the interest rate differential continuously, which is small. They are exposed to yen appreciation all at once, which can be large. When the yen moves sharply higher, every piece of the position takes a mark-to-market loss simultaneously, and levered holders are forced to reduce exposure. That forced selling pressures the yen further, creating the feedback loop that August 2024 demonstrated.

What Changed, and What Didn't

The Bank of Japan ended yield curve control in 2024 and has since raised the policy rate multiple times, pushing the short-term target well above zero for the first time in a decade. This is the normalization that the carry trade's critics have been warning about for years. On paper, it should be gradually unwinding the position.

In practice, it has not done so in orderly fashion. The yen has appreciated from its 2024 lows but remains significantly weaker than fundamentals suggest it should be. The differential between US and Japanese short rates has narrowed but remains large enough to sustain carry trading in the currency pair most responsible for the 2024 episode. The BOJ's balance sheet, while no longer expanding, remains near record size, and the institution continues to hold more than half of all outstanding Japanese government bonds.

The structural imbalance has not been resolved. It has been partially adjusted in ways that make the remaining position more vulnerable to sudden moves, not less. As the BOJ continues to normalize, each incremental step pressures the carry position, and the response to each step is a function of how much leverage is still stacked on top.

The US Treasury Connection

Here is the part that most macro commentary does not emphasize enough. Japan is the largest foreign holder of US Treasuries, with holdings above $1 trillion. A significant portion of these holdings exists because Japanese insurance companies, pension funds, and life insurers have been forced into higher-yielding dollar assets as domestic yields stayed at or near zero for years. That allocation is structurally dependent on the yen staying weak relative to the dollar, because a strong yen makes unhedged dollar bond holdings immediately painful.

When the yen rallies, Japanese institutional holders of US Treasuries face two choices: hedge more aggressively, which has a cost and compresses the yield advantage they were seeking, or reduce exposure by selling. Both choices put pressure on Treasury prices, which means pressure on Treasury yields. This is one of the quiet reasons the US 10-year yield remains elevated even as the Fed signals cuts: the marginal foreign bid from Japan is less reliable than it was five years ago.

An August 2024-style episode, at larger scale, would produce forced Japanese selling of Treasuries exactly at the moment when the Fed needs long yields to come down to transmit monetary easing. The global macro feedback between the yen, Treasuries, and US equities is tighter than most position books assume.

What Triggers the Next Move

The August 2024 episode was triggered by a combination of BOJ rate guidance that was slightly more hawkish than expected and a weak US payrolls print on the same week. Neither event individually would have produced that response. Together, they broke a leverage equilibrium that had been building for months.

Similar setups remain possible. The specific catalyst is not predictable, but the conditions are known. A hawkish surprise from the BOJ, a dovish surprise from the Fed, a weak US macro print that accelerates Fed-cut pricing, an unexpected Chinese currency move, a geopolitical event that drives safe-haven yen buying, any of these can function as the trigger. The structural position is large enough that the trigger does not need to be severe.

What matters is that the position is still there. Most post-August 2024 commentary assumed the unwind had happened. It hadn't. It was interrupted. The carry trade re-accumulated through the subsequent months as volatility fell and the BOJ moved cautiously.

The next episode will probably look like the last one. Sharp yen rally, Japanese equity breakdown, global risk-off, forced Treasury selling, correlated losses across carry-funded positions. It will resolve faster than 2008 and slower than a flash crash. It will be bought as a dip by people who do not realize they are buying into an unfinished process.

What Bitcoin Does in That Scenario

In the first 48 hours of a carry unwind, Bitcoin trades with risk assets. It falls. It looks correlated. The mechanism is straightforward: leveraged positions across asset classes are reduced simultaneously, and Bitcoin, as a liquid risk asset, participates in the drawdown.

In the subsequent weeks, the picture diverges. Global central banks respond to the episode with liquidity provision. The BOJ intervenes. The Fed accelerates cuts or provides swap line capacity. Financial conditions ease sharply as policymakers prevent a disorderly unwind from cascading. And then the assets that benefit from liquidity injection rally harder than the assets that were merely correlated risk holdings during the initial drawdown.

Bitcoin, alongside gold, is in the first category. The August 2024 episode followed this pattern: sharp drawdown, rapid recovery, strong performance through the following quarter as liquidity conditions eased.

The setup now is broadly similar. The question is not whether another carry tremor is coming. It is whether you have cash to deploy on the first drawdown, or whether you are already positioned in a way that forces you to sell alongside the unwind.

Japan's carry trade is not over. It is paused.

Plan accordingly.