Billionaire hedge fund manager Bill Ackman revealed on Friday that his activist investment firm has bought up approximately ...

Pershing Square's Bill Ackman revealed Friday that he has built a significant stake in Uber, saying the stock is still ...

With Bill Ackman's posts, one of the world’s most prominent investors is intensifying a dispute between a doctor and ...

Pershing Square Capital Management Chief Executive Officer Bill Ackman said he took down a critical post about UnitedHealth Group Inc. after the company’s lawyers told him the claims about the company ...