CNBC: Meet the 2018 CNBC Disruptor 50 companies

In the sixth annual Disruptor 50 list, CNBC features private companies — from biotech and machine learning to transportation and retail and even exploring outer space — whose innovations are changing the world. These forward-thinking start-ups have not only identified unexploited niches in the market that have the potential to become billion-dollar businesses, a majority of them already are billion-dollar businesses. A startling 33 disruptors this year are unicorns that have already reached or passed the billion-dollar mark…