One of the most enduring foreign-exchange bets is off to its best run in decades as surprisingly muted volatility across asset classes has investors piling into carry trades. The strategy, which involves borrowing in low-yielding currencies to fund purchases of higher-yielding ones, has benefited from a prolonged period of calm in global markets. With major central banks holding interest rates steady and economic data showing resilience, the usual catalysts for sharp currency swings have been absent.

This environment has allowed carry traders to accumulate profits with minimal drawdowns, attracting fresh capital from hedge funds and institutional investors alike. However, veterans warn that the trade's popularity could amplify a reversal if volatility suddenly returns. The Bloomberg Dollar Spot Index has remained range-bound, while emerging-market currencies have offered attractive yield differentials.

As the Federal Reserve and other central banks signal potential rate cuts later in the year, the carry trade's appeal may persist, though the risk of a violent unwind grows with each week of complacency.