Ackman’s $2 billion Uber stake has sparked a close relationship with CEO Dara Khosrowshahi, who welcomes his feedback and long-term vision.

Hedge-fund billionaire Bill Ackman on Thursday urged President Trump and Elon Musk to stop fighting. The two men should “make ...

Billionaire Bill Ackman has invested $900 million to transform Howard Hughes Holdings into a "modern-day Berkshire Hathaway." Can his ambitious plan succeed despite skeptical investors, high capital ...