The insurer and its law firm denies a doctor’s online claim that it refused to cover care for a cancer patient.

Two months after UnitedHealthcare CEO Brian Thompson was killed, the insurer's parent company is going after people who say ...

In the aftermath of its CEO's stunning assassination, UnitedHealthcare is now doubling down and threatening legal retaliation ...

Uber’s stock extends its surge as hedge funder Ackman says he’s amassed a 30.3-million-share stake since early January.

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

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 ...

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

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 ...

Former bond king Bill Gross says that the hot energy pipeline stocks “‘seem to be topping” after a big run and that he has ...

Plus, the food conglomerate owner of Krispy Kreme buys an insurance company and a distressed-debt battle in Japan ...

UnitedHealth shares fell more than 4% on Wednesday before finishing down 1%, a day after hedge-fund manager Bill Ackman wrote a post on social media that said the insurer could be overstating its ...