Warren Buffett's Berkshire Hathaway loses Bill Ackman as an investor

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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.*
· *The move is surprising as Ackman boosted his Berkshire holdings by more than a third in the first...