It took decades for hedge fund titans Ken Griffin and Ray Dalio to become billionaires.

It took slightly less for Baiju Bhatt and Vlad Tenev.

Bhatt and Tenev founded the online stock brokerage Robinhood Markets.

They became Silicon Valley’s newest billionaires after a recent funding round pushed the valuation of their startup to $6 billion.

Just last year, Robinhood’s valuation was just $1.3 billion.

Industry experts are impressed by the speed that Robinhood achieved the $6 billion valuation.

Robinhood users have saved more than $1 billion in commissions.