Pershing Square Now Down 15.9 Percent

Bill Ackman's Pershing Square Holdings is now down 15.9 percent for the year as of Oct. 27. Recall that Pershing was down 11.2 percent just last week. 

This comes as Valeant Pharma (NYSE: VRX) is off 26% over the last three months. Pershing Square owns over 5% of Valeant and it's the fund's second largest holding. 

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