X0306 4 2018-09-18 0001447669 TWILIO INC TWLO 0001665930 Lawson Jeff C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 1 1 Chief Executive Officer Class A Common Stock 2018-09-18 4 S 0 4668 85.1589 D 122525 I By Lawson Revocable Trust Class A Common Stock 2018-09-18 4 S 0 14342 85.8082 D 108183 I By Lawson Revocable Trust Class A Common Stock 2018-09-18 4 S 0 1820 86.4704 D 106363 I By Lawson Revocable Trust Class A Common Stock 141801 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 $84.40 to $85.39 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. Erica Freeman Lawson and Jeffrey Gordon Lawson Trustees of the Lawson Revocable Trust dated 10/2/11. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.40 to $86.39 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 $86.40 to $86.64 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. 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. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2018-09-20