X0306 4 2016-09-02 0001463172 Zendesk, Inc. ZEN 0001478971 Stalder Dana 260 HOMER AVENUE SUITE 201 PALO ALTO CA 94301 1 Common Stock 2016-09-02 4 S 0 30000 30.949 D 75319 I By Vista Grande Trust Dated January 24, 2001 as amended This sale price represents the weighted average sale price of the shares sold ranging from $30.68 to $31.22 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. Shares held by Vista Grande Trust dated January 24, 2001 as amended. The Reporting Person is a trustee and beneficiary of the trust. /s/ Hasani Caraway, attorney-in-fact for Dana Stalder 2016-09-06