X0306 4 2018-11-28 0001447669 TWILIO INC TWLO 0001219068 DONIO ELENA A. C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 Class A Common Stock 2018-11-28 4 C 0 6000 0 A 15900 D Class A Common Stock 2018-11-28 4 S 0 6000 85.9051 D 9900 D Class B Common Stock 2018-11-28 4 C 0 6000 0 D Class A Common Stock 6000 23733 D A portion of these shares represent Restricted Stock Units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. The Reporting Person has elected to sell the shares reported in this transaction to satisfy tax obligations required in connection with shares received with the vesting of Restricted RSUs. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.89 to $86.03 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. 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 RSUs. Each RSU represents a contingent right to receive one share of Issuer's Class B Common Stock. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2018-11-30