Many U.S. institutional investors believe the Japanese yen is trading below its fair value, yet that view has not translated into broad buying. Fund managers appear cautious about adding exposure to the currency even as it is widely seen as significantly undervalued.

The main reason for that hesitation is uncertainty around Japan's policy response. Investors are looking for clearer signals from Japanese officials on how they plan to protect or stabilize the currency before making bigger moves in the market.

That wait-and-see approach suggests valuation alone is not enough to drive investment decisions. For large money managers, confidence in official action and policy direction can matter as much as the belief that an asset is cheap.

As a result, the yen remains in a difficult position: viewed by many as attractive on paper, but still lacking the policy clarity needed to draw stronger support from major U.S. investors.