VISIT CNBC.COMX South by Southwest South by SouthwestMark Cuban: Why I regret not investing in Uber Catherine Clifford 53 Mins Ago CNBC.com show chapters What Mark Cuban learned from missing out on Uber    55 Mins Ago | 00:59 SHARES Mark Cuban had a chance to invest in Uber and he missed it. That's a decision he now regrets, Cuban says. He spoke at...