It's been a wild ride for Twilio, the $2.4 billion cloud communications company behind 2016's hottest tech IPO. After debuting in June 2016 at $15 per share, Twilio's stock soared to a peak of $70.96 by September. By Halloween, Twilio was down to less than half that. Early May saw another dip after Twilio announced that Uber, one of its marquee customers, was starting to reduce its reliance on the service to send text messages to drivers and passengers. By market close on Wednesday, Twilio was trading at around $26 per share.