X0306 4 2017-05-15 0001447669 TWILIO INC TWLO 0001665731 Kirkpatrick Lee C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 Chief Financial Officer Class A Common Stock 2017-05-15 4 C 0 7000 0 A 14868 D Class A Common Stock 2017-05-15 4 S 0 7000 24.0535 D 7868 D Employee Stock Option (right to buy) 1.24 2017-05-15 4 M 0 7000 0 D 2022-05-16 Class B Common Stock 7000 474076 D Class B Common Stock 2017-05-15 4 M 0 7000 0 A Class A Common Stock 7000 121112 D Class B Common Stock 2017-05-15 4 C 0 7000 0 D Class A Common Stock 7000 114112 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 Includes 3,333 shares acquired by the reporting person pursuant to the Issuer's 2016 Employee Stock Purchase Plan on May 15, 2017. The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the reporting person. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.70 to $24.28 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. 25% of the shares subject to this option vested on May 7, 2013, and the remaining shares subject to this option vest in 36 equal monthly installments thereafter, subject to the reporting person's continuous service to the Issuer on each such date. The option is early 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. 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/ Mariam Sattar as attorney in fact for Reporting Person 2017-05-17