10 Startups That Reached a $1 Billion Valuation in Practically No Time

There are 135 private companies in the U.S. worth $1 billion or more. In the startup world, the odds of a company achieving a valuation of $1 billion or more is considered so slim, it's named after a mythical beast -- the unicorn. In the entire US, there are just 135 private companies that are valued …