X0306 4 2016-11-15 0001463172 Zendesk, Inc. ZEN 0001606158 Raimondi Anne 1019 MARKET STREET SAN FRANCISCO CA 94103 1 SVP Marketing Common Stock 2016-11-15 4 M 0 177 A 11944 D Common Stock 2016-11-15 4 F 0 93 23.46 D 11851 D Common Stock 2016-11-15 4 M 0 175 A 12026 D Common Stock 2016-11-15 4 F 0 92 23.46 D 11934 D Restricted Stock Unit 2016-11-15 4 M 0 177 D 2022-02-05 Common Stock 177 4782 D Restricted Stock Unit 2016-11-15 4 M 0 175 D 2023-05-06 Common Stock 175 7351 D Restricted stock units convert into common stock on a one-for-one basis. Includes 2 shares acquired by the Reporting Person on November 14, 2016 pursuant to the Issuer's Employee Stock Purchase Plan in a transaction exempt under Rule 16b-3(c). Represents the number of shares withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of the restricted stock units listed in Table II. Such withholding is mandated by an election of the Issuer made in advance and does not represent a discretionary trade by the Reporting Person. 1/48th of the shares issuable pursuant to the restricted stock units shall vest monthly after the vesting commencement date of February 15, 2015, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events. 1/48th of the shares issuable pursuant to the restricted stock units shall vest each month after the vesting commencement date of May 15, 2016, subject to the Reporting Person's continuous service to the Issuer on each such date. Unvested shares are subject to acceleration upon the occurrence of certain events. /s/ Hasani Caraway, Attorney-in-fact for Anne Raimondi 2016-11-17