Your Vote Counts! ZSCALER, INC. 120 HOLGER WAY SAN JOSE, CALIFORNIA 95134 ZSCALER, INC. 2023 Annual Meeting Vote by January 4, 2024 11:59 PM ET You invested in ZSCALER, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on January 5, 2024. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to December 22, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Vote Virtually at the Meeting* January 5, 2024 1:00 p.m., Pacific Time Virtually at: www.virtualshareholdermeeting.com/ZS2023 *Please check the meeting materials for any special requirements for meeting attendance. Smartphone users Point your camera here and vote without entering a control number V1.2 For complete information and to vote, visit www.ProxyVote.com Control # V26056-P01252