Billionaire investor Bill Ackman is once again flexing his political muscle — this time by publicly touting the New York mayoral candidacy of former hedge fund manager Whitney Tilson because ...

Billionaire Bill Ackman disclosed Friday his hedge fund made a major bet on ride hailing giant Uber, helping boost shares of the San Francisco-based company to their highest level in months as ...

Bill Ackman put pressure on one of the largest companies in the world with a tweet that he later deleted. Here's a look at what Ackman said about UnitedHealth Group. Brand New Membership Level ...

Billionaire investor Bill Ackman pledged to cover the legal fees for a Texas doctor in a dispute with UnitedHealth Group Inc. over her claims that the company asked her to scrub out of an ...

Bill Ackman thinks Uber shares are a bargain. The billionaire activist investor and CEO of Pershing Square Holdings revealed Friday that his firm has built a significant position in the rideshare ...