X0306 4 2018-07-23 0001447669 TWILIO INC TWLO 0001386396 Hu George C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 Chief Operating Officer Class A Common Stock 2018-07-23 4 M 0 5000 31.72 A 215420 D Class A Common Stock 2018-07-23 4 S 0 2279 62.8527 D 213141 D Class A Common Stock 2018-07-23 4 S 0 2721 63.8451 D 210420 D Class A Common Stock 2018-07-24 4 M 0 5000 31.72 A 215420 D Class A Common Stock 2018-07-24 4 S 0 1362 61.7094 D 214058 D Class A Common Stock 2018-07-24 4 S 0 1345 62.3984 D 212713 D Class A Common Stock 2018-07-24 4 S 0 1958 63.7256 D 210755 D Class A Common Stock 2018-07-24 4 S 0 335 64.4557 D 210420 D Class A Common Stock 2018-07-25 4 M 0 5000 31.72 A 215420 D Class A Common Stock 2018-07-25 4 S 0 1532 62.5895 D 213888 D Class A Common Stock 2018-07-25 4 S 0 2431 63.8886 D 211457 D Class A Common Stock 2018-07-25 4 S 0 1037 64.2962 D 210420 D Employee Stock Option (right to buy) 31.72 2018-07-23 4 M 0 5000 0 D 2024-02-27 Class A Common Stock 5000 828614 D Employee Stock Option (right to buy) 31.72 2018-07-24 4 M 0 5000 0 D 2024-02-27 Class A Common Stock 5000 823614 D Employee Stock Option (right to buy) 31.72 2018-07-25 4 M 0 5000 0 D 2024-02-27 Class A Common Stock 5000 818614 D Employee Stock Option (right to buy) 31.72 2024-02-27 Class A Common Stock 185000 185000 D Employee Stock Option (right to buy) 33.01 2028-02-19 Class A Common Stock 96214 96214 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 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 $62.33 to $63.30 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.38 to $64.12 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.14 to $62.12 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.14 to $63.04 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.23 to $64.15 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.39 to $64.50 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $61.93 to $62.89 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.18 to $64.17 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. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.18 to $64.45 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. The shares subject to the stock option vest as follows: 25% of the stock option vested on February 28, 2018 and the remaining shares subject to the stock option shall vest in equal monthly installments over the following three years, subject to the Reporting Person's continued service to the Issuer through each vesting date. The shares subject to the stock option vest as follows: 50% of the stock option vested on March 31, 2018 and the remaining shares subject to the stock option shall vest in 24 equal monthly installments thereafter, subject to the Reporting Person's continued service to the Issuer through each vesting date. The shares subject to the stock option vest as follows: 1/48th of the shares vested on March 15, 2018 and the remaining shares subject to the stock option shall vest in equal monthly installments over the following four years, subject to the Reporting Person's continued service to the Issuer through each vesting date. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2018-07-25