X0306 4 2019-05-20 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 2019-05-20 4 C 0 20830 0 A 71442 I By Lawson Revocable Trust Class A Common Stock 2019-05-20 4 S 0 3435 137.0132 D 68007 I By Lawson Revocable Trust Class A Common Stock 2019-05-20 4 S 0 6263 137.7707 D 61744 I By Lawson Revocable Trust Class A Common Stock 2019-05-20 4 S 0 5533 138.9908 D 56211 I By Lawson Revocable Trust Class A Common Stock 2019-05-20 4 S 0 5599 139.748 D 50612 I By Lawson Revocable Trust Class A Common Stock 157293 D Class B Common Stock 2019-05-20 4 C 0 20830 0 D Class A Common Stock 20830 6048019 I By Lawson Revocable Trust Class B Common Stock Class A Common Stock 35625 35625 D Class B Common Stock Class A Common Stock 725944 725944 I By Lawson 2014 GRAT Class B Common Stock Class A Common Stock 323170 323170 I By Lawson 2014 Irrevocable Trust Erica Freeman Lawson and Jeffrey Gordon Lawson Trustees of the Lawson Revocable Trust dated 10/2/11. 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 $136.40 to $137.38 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 $137.40 to $138.38 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 $138.46 to $139.44 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 $139.47 to $140.33 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. 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. Jeffrey Gordon Lawson Trustee of the Lawson 2014 GRAT dated 12/29/14. JP Morgan Trust Company of Delaware Trustee U/A 12/29/14 Lawson 2014 Irrevocable Trust. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2019-05-22