X0306 4 2018-12-18 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 2018-12-18 4 S 0 1562 39.1562 D 97966 D The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted on June 21, 2018. The reported shares were acquired under the Issuer's Fiscal Year 2018 Employee Stock Purchase Plan on December 17, 2018. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.64 to $39.62, 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. /s/ Torrie Nute, by power of attorney 2018-12-19