Light Street Capital Proposes Superior Alternative To Zendesk’s Proposed Transaction With Hellman & Friedman And Permira

Zendesk, Inc.

989 Market Street

San Francisco, CA 94103

Dear Members of the Board,

We are writing to you on behalf of Light Street Capital Management, LLC and our affiliates (together “Light Street” or “we”). Light Street owns more than 2% of Zendesk, Inc.’s (the “Company” or “Zendesk”) outstanding shares, making us one of the Company’s ten largest current …