Zendesk to Report First Quarter 2015 Financial Results on May 5, 2015

April 9, 2015

SAN FRANCISCO, CA —April 9, 2015—Zendesk, Inc. (NYSE: ZEN) today announced that it will release financial results for the first fiscal quarter ended March 31, 2015, following the close of the U.S. markets on Tuesday, May 5, 2015.

Zendesk will host a conference call to discuss financial results at 2:00 p.m. Pacific Time, 5:00 p.m. Eastern Time, on Tuesday, May 5, 2015. A live webcast of the conference call will be available at https://investor.zendesk.com. The conference call can also be accessed by dialing 877-201-0168, or +1 647-788-4901 (outside the U.S. and Canada). The conference ID is 23504100. A replay of the call via webcast will be available at https://investor.zendesk.com or by dialing 855-859-2056 or +1 404-537-3406 (outside the U.S. and Canada) and entering passcode 23504100. The dial-in replay will be available until the end of day May 7, 2015. The webcast replay will be available for 12 months.

About Zendesk

Zendesk provides a customer service platform designed to bring organizations and their customers closer together. With more than 52,000 paid customer accounts, Zendesk is used by organizations in 150 countries and territories to provide support in more than 40 languages. Founded in 2007 and headquartered in San Francisco, Zendesk has operations in the United States, Europe, Asia, Australia and South America. Learn more at www.zendesk.com