X0306 4/A 2017-06-15 2017-06-19 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 2017-06-15 4 S 0 7000 25.8952 D 58485 D 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 $25.44 to $26.06 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. This Form 4A is being filed to amend the weighted average price range in footnote 2 above. No new transactions are being reported in this Form 4A. A portion of these shares represent Restricted Stock Units ("RSUs") previously reported on a Form 4 filed February 14, 2017. Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. /s/ Mariam Sattar as attorney in fact for Reporting Person 2017-06-21