X0306 4 2018-03-20 0 0001713683 Zscaler, Inc. ZS 0001299634 Giancarlo Charles H C/O ZSCALER, INC. 110 ROSE ORCHARD WAY SAN JOSE CA 95134 1 0 0 0 Common Stock 2018-03-20 4 P 0 125000 16.00 A 125000 I See footnote. Common Stock 179861 D Common Stock 26736 I See footnote. Common Stock 26736 I See footnote. The shares are held of record by The Charles H. & Dianne G. Giancarlo Family Trust U/D/T 11/2/98 for which the reporting person serves as trustee. The shares are held of record by The 2012 Marielle Christina Giancarlo Trust UAD 12/26/12 for which the reporting person serves as a trustee. The shares are held of record by The 2012 Gianna Marie Giancarlo Trust UAD 12/26/12 for which the reporting person serves as a trustee. /s/ Torrie Nute, by power of attorney 2018-03-20