X0306 4 2018-05-15 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 2018-05-15 4 S 0 1618 50.9624 D 63466 D Class A Common Stock 2018-05-15 5 G 0 E 1545 0 D 61921 D Class A Common Stock 2018-05-15 5 G 0 E 1545 0 A 81672 I By The Kirkpatrick Family Trust Represents the number of shares sold to cover the statutory tax withholding obligations in connection with the vesting of Restricted Stock Units ("RSUs"). This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of minimum statutory tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary sale 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 $50.95 to $51.4521 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 RSUs. Each RSU represents the contingent right to receive one share of the Issuer's Class A common stock. Includes 957 shares acquired by the Reporting Person pursuant to the Issuer's 2016 Employee Stock Purchase Plan on May 15, 2018. Represents shares that were contributed by the Reporting Person to the Reporting Person's trust. Represents the shares received by the Reporting Person's trust. The Kirkpatrick Family Trust, established 9/28/1999. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2018-05-17