X0306 4 2019-03-05 0 0001713683 Zscaler, Inc. ZS 0001435941 Schlossman Robert C/O ZSCALER, INC. 110 ROSE ORCHARD WAY SAN JOSE CA 95134 0 1 0 0 Chief Legal Officer Common Stock 2019-03-05 4 M 0 10000 4.40 A 107966 D Common Stock 2019-03-05 4 S 0 9998 57.4953 D 97968 D Common Stock 2019-03-05 4 S 0 2 57.86 D 97966 D Employee Stock Option (right to buy) 4.40 2019-03-05 4 M 0 10000 0.00 D 2023-01-15 Common Stock 10000 285000 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 21, 2018. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $56.82 to $57.80, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 21, 2018. The option is subject to an early exercise provision and is immediately exercisable. One-fourth of the shares subject to the option vested on January 14, 2017 and 1/48 of the shares vest monthly thereafter. /s/ Torrie Nute, by power of attorney 2019-03-06