Want to know who owns Corporate America? It's not Bill Gates or Elon Musk. It's Vanguard. Thanks to the surging popularity of its index funds, Vanguard is now the No. 1 owner of 330 stocks in the S&P 500, or two-thirds of the world's most important collection of stocks, says an Investor's Business Daily analysis of data from S&P Global Market Intelligence and MarketSmith.