Bill Ackman made $2 billion shorting the market and then went long. Here's what he's buying

Bill Ackman, founder and CEO of Pershing Square Capital Management.
Adam Jeffery | CNBC

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Bill Ackman's Pershing Square Capital plowed much of its profits from a big short against the market in March back into its core holdings and ended the first quarter with four equity positions worth at least $900 million, according to a securities filing released Friday.