10 fast-paced start-ups that reached $1 billion in record time By: CNBC.com News May 23, 2017 at 11:09 AM EDT Some disruptive start-ups have reached $1 billion in market valuation in one or two years. Here's a look at those growing at warp speed. Read More >> Related Stocks: Facebook Leaf Group Ltd Snap Inc Zynga Inc Cl A