Billionaire investor Bill Ackman pledged to cover the legal fees for a Texas doctor in a dispute with UnitedHealth Group Inc.

Billionaire hedge fund manager Bill Ackman revealed on Friday that his activist investment firm has bought up approximately $2 billion worth of shares of Uber — sending the ride-share company ...

Bill Ackman expects privatization of Fannie Mae will provide a huge catalyst for the stock. However, Wall Street analysts are concerned any privatization attempts will fail. The uncertainty makes ...