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Investors’ bets against Molycorp Inc. stock are at their highest since the rare-earth producer’s July 2010 initial public offering on speculation that prices for the minerals will keep falling.
About 19 percent of Molycorp shares outstanding were sold short Nov. 28, up from 7.2 percent at the beginning of the year, according to the most recent data from Data Explorers, a New York-based research firm. Molycorp is the 12th most-shorted stock in the index.



