Wall Street's top bull Ron Baron: directly placed a $1 billion IPO subscription order for the soon-to-be-listed SpaceX and promised never to sell in his lifetime. This guy has been all-in on SpaceX since 2017 through employee buybacks, investing $1.7 billion in principal, which has now grown to $15 billion. With an annual compound return rate of 54%, it’s become the top holding in his $55 billion fund.