With $20 trillion between them, Blackrock and Vanguard could own almost everything by 2028

 https://financialpost.com/investing/a-20-trillion-blackrock-vanguard-duopoly-is-investings-future

https://www.bloomberg.com/news/features/2017-12-04/blackrock-and-vanguard-s-20-trillion-future-is-closer-than-you-think