Bill Ackman is the founder and CEO of Pershing Square, a hedge fund with around $12.9 billion in assets under management. That includes billions of dollars invested in popular sto ...

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 ...

Uber stock hit its highest level since October after Ackman disclosed his Pershing Square hedge fund accumulated a 1.4% stake ...

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 ...