Shorts Reload in S&P 500 Ritual That Signaled Gain Before

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For five years it’s been the fate of American short sellers to be wrong, as the biggest rally since the Internet bubble steamrolled defensive trades.

They’re loading up again, sending bearish wagers in the SPDR exchange-traded fund tracking the Standard & Poor’s 500 Index to almost 11 percent of its shares, the highest proportion since 2012, according to data compiled by Bloomberg and Markit Securities Ltd. Bets against a technology ETF are 67 percent above the 12-month average.