Overall hedge-fund exposure to U.S. equities sits at the lows for the year, according to data compiled by Nomura Holdings Inc.

There’s another, perhaps more ominous, explanation. Rather than a tactical decision to reduce exposure, redemptions and closures in the $3 trillion market may be to blame for the unwind in bearish positions, said Pierson.

As ever, shifts in market structure are also playing a role.

Traders are using options and more liquid exchange-traded funds to express bearish views, often at the expense of single-stock trades. Even so, they’ve delevered across the board -- and it would require a big catalyst like a growth scare to up downside wagers right now, according to Martin at Deutsche.

“Nobody wants to put on a big single-stock short and have the holiday market rip and hurt their returns,” she said.

This article was provided by Bloomberg News.

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