Yen Surge Threatens Hedge Fund Play as Traders Seek New Funding Currencies

The yen has hit a seven-month high, causing a popular hedge-fund play to be disrupted. Borrowing cheaply in Japan and using that cash to chase higher yields elsewhere is no longer as straightforward.

A foreign-exchange carry trade typically works best when the 'funding' currency stays low-yielding and calm. However, Japan's years of ultra-low rates are fading, and the yen's jump has been tied to expectations of faster Bank of Japan tightening and some investors bringing money back home after late-July intervention.

This shift makes 'sell yen' feel less like a set-it-and-forget-it trade, so traders are scouting replacements. The Swiss franc is being considered because Switzerland's central bank rate has been parked at zero for more than a year, and markets expect only limited tightening over the next few years.