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Warren Buffett's Berkshire Hathaway has lost Bill Ackman as an investor. The hedge-fund manager revealed the sale of his Pershing Square fund's $1 billion Berkshire stake in a conference call on Wednesday. Pershing sold Berkshire in the last few weeks to free up cash so it can capitalize if prices fall again, Ackman said on the call. The move is surprising as Ackman boosted...