X0306 4 2016-02-15 0001463172 Zendesk, Inc. ZEN 0001657205 Kleha Amanda 1019 MARKET STREET SAN FRANCISCO CA 94103 1 SVP Velocity Businesses Common Stock 2016-02-15 4 M 0 291 A 6745 D Common Stock 2016-02-15 4 F 0 128 15.83 D 6617 D Restricted Stock Unit 2016-02-15 4 M 0 291 D 2022-02-05 Common Stock 291 10501 D Restricted stock units convert into common stock on a one-for-one basis. 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. The grant of restricted stock units, originally representing 14,000 units, vests as to 1/48th of the shares 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. /s/ John Geschke, Attorney-in-Fact for Amanda Kleha 2016-02-16