Hedge fund manager Bill Ackman just disclosed a position in Uber. Bill Ackman is one of the most closely followed investment personalities on Wall Street. As CEO of hedge fund Pershing Square Capital Management, Ackman has been at the center of some creatively structured investments in recent history.

NEW YORK (Reuters) - Billionaire investor Bill Ackman's plans to turn real estate company Howard Hughes Holdings into a diversified holding company will not impact how his investment portfolios buy and sell stakes in companies.