Investors pile into yen carry trades as dollar weakness fuels risky bets

There’s a trade on Wall Street that feels like picking up nickels in front of a steamroller, except right now the nickels are hundred-dollar bills and the steamroller seems to be parked. Investors have rushed back into yen-funded carry trades with remarkable enthusiasm, betting that the US dollar will keep sliding and that Japan’s rock-bottom borrowing costs will continue to subsidize their returns.

The strategy is straightforward in concept: borrow Japanese yen at the Bank of Japan’s roughly 1.00% interest rate, convert those yen into dollars or other higher-yielding currencies, and park the money in assets like US Treasuries or emerging market bonds that pay substantially more. Pocket the difference. Repeat.

The numbers behind the rush

So far in 2026, the math has been generous. Carry trade strategies have reportedly returned approximately 18% year-to-date, outperforming other systematic approaches by a wide margin.

The fuel for this bonfire is dollar weakness. The greenback has fallen roughly 10% against major currencies since early 2025, a decline driven by a cocktail of US fiscal anxieties, policy unpredictability, and a gradual reshuffling of global capital flows.

The yen itself has been trading around 159 to 162 per dollar, levels that haven’t been seen in decades. For carry traders, a weak yen is the gift that keeps on giving. It means the currency you borrowed in stays cheap relative to your investments, effectively adding a tailwind on top of the interest rate spread.

Hedge funds, in particular, have been active participants. Earlier in the year, many funds halved their bearish yen positions in a brief moment of caution, only to rebuild their short bets as the dollar continued its descent and the trade kept printing money.

Why this could go sideways

The core risk is simple: if the yen appreciates suddenly, every carry trader simultaneously owes more in the currency they borrowed. This triggers a rush to close positions, which itself pushes the yen higher, which forces more closures. The resulting stampede can amplify volatility across foreign exchange markets, equities, and bonds.

The Bank of Japan remains the biggest wild card. Any signal that Japanese policymakers intend to tighten monetary conditions, or any direct intervention in currency markets to strengthen the yen, could spark exactly this kind of cascade. Japanese and US authorities have both taken actions recently that reflect just how fragile the equilibrium is.

Analysts at JPMorgan and Morgan Stanley have flagged the USD/JPY exchange rate as a critical barometer for broader dollar trends. If the yen breaks through certain levels, it could trigger synchronized weakness across multiple currency pairs, turning what looks like a contained FX move into a multi-asset event.

A familiar movie with an uncertain ending

The yen carry trade was enormously popular in the mid-2000s before it unwound violently during the 2008 financial crisis. A more recent episode played out in the summer of 2024, when a sudden yen rally forced rapid deleveraging and sent shockwaves through equity markets worldwide.

The yen carry trade has become one of the dominant sources of liquidity in global markets in 2026. That means a disorderly unwind wouldn’t just hurt currency speculators. It could drain liquidity from corners of the market that seem entirely unrelated, from emerging market debt to US corporate bonds.

The interest rate differential between Japan and the US, while narrowing slightly, remains wide enough to make the carry attractive. And as long as the dollar keeps weakening, traders get paid from both the yield spread and the currency move.