X0306 4 2018-02-15 0001447669 TWILIO INC TWLO 0001284038 ROTTENBERG ERIKA C/O TWILIO INC. 375 BEALE STREET, SUITE 300 SAN FRANCISCO CA 94105 1 Class A Common Stock 2018-06-12 5 G 0 E 6005 0 D 0 D Class A Common Stock 2018-06-12 5 G 0 E 6005 0 A 6005 I By Trust Class A Common Stock 2018-11-28 4 C 0 5000 0 A 11005 I By Trust Class A Common Stock 2018-11-28 4 S 0 3750 88.9264 D 7255 I By Trust Class B Common Stock 2018-02-15 5 G 0 E 2185 0 D Class A Common Stock 2185 13109 D Class B Common Stock 2018-02-15 5 G 0 E 2185 0 A Class A Common Stock 2185 12978 I By Trust Class B Common Stock 2018-05-15 5 G 0 E 2185 0 D Class A Common Stock 2185 10924 D Class B Common Stock 2018-05-15 5 G 0 E 2185 0 A Class A Common Stock 2185 15163 I By Trust Class B Common Stock 2018-08-15 5 G 0 E 2185 0 D Class A Common Stock 2185 8739 D Class B Common Stock 2018-08-15 5 G 0 E 2185 0 A Class A Common Stock 2185 17348 I By Trust Class B Common Stock 2018-11-15 5 G 0 E 2184 0 D Class A Common Stock 2184 6555 D Class B Common Stock 2018-11-15 5 G 0 E 2184 0 A Class A Common Stock 2184 19532 I By Trust Class B Common Stock 2018-11-28 4 C 0 5000 0 D Class A Common Stock 5000 14532 I By Trust 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. Shares are held by The Erika Rottenberg Revocable Trust. The Reporting Person has elected to sell the shares reported in this transaction to satisfy tax obligations required in connection with shares received with the vesting of Restricted Stock Units ("RSUs"). The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.911 to $88.93 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. 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. /s/ Alexis Rhorer as attorney in fact for Reporting Person 2018-11-30