 Shares of Twilio Inc. TWLO, -3.01 plummeted 23.5 toward a 4 12-year low in premarket trading Friday, after the customer communications software company reported a large third-quarter net loss and provided a downbeat fourth-quarter outlook. The stock is on track to open at the lowest price seen during regular-session hours since May 2018, and to suffer the biggest one-day drop since it lost 26.3 on May 3, 2017. 