X0306 4 2017-09-01 0001447669 TWILIO INC TWLO 0001665731 Kirkpatrick Lee C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 Chief Financial Officer Employee Stock Option (right to buy) 1.24 2017-09-01 4 M 0 20000 0 D 2022-05-16 Class B Common Stock 20000 421076 D Class B Common Stock 2017-09-01 4 M 0 20000 0 A Class A Common Stock 20000 120261 D Employee Stock Option (right to buy) 10.09 2025-12-30 Class B Common Stock 175000 175000 D Employee Stock Option (right to buy) 31.96 2027-02-09 Class A Common Stock 95056 95056 D The option is fully vested and exercisable by the reporting person. Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder and has no expiration date. A portion of these shares represent Restricted Stock Units ("RSU's). Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. The shares subject to this option vest in 34 equal monthly installments, with the first installment on July 15, 2016. The option is early exercisable by the reporting person. The Stock Option ("Option") shall vest as follows: 1/4th of the Option shall vest on January 1, 2018, and 1/48th of the Option shall vest monthly thereafter, subject to continued service to the Issuer on each vesting date. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2017-09-06