X0306 4/A 2019-04-20 2019-04-23 0 0001327567 Palo Alto Networks Inc PANW 0001250333 ZUK NIR C/O PALO ALTO NETWORKS INC. 3000 TANNERY WAY SANTA CLARA CA 95054 1 1 0 0 EVP, Chief Technology Officer Common Stock 2019-04-20 4 F 0 1740 235.46 D 971643 D Common Stock 209077 I See footnote Common Stock 44976 I See footnote This transaction is not a sale of shares by the Reporting Person. Instead, this represents shares that have been withheld by the Issuer to satisfy its income tax and withholding and remittance obligations in connection with the vesting and net settlement of previously reported restricted stock awards, performance-based restricted stock awards, and restricted stock units. Shares are held by the Zuk 2017 GRAT dates March 29, 2017, for which the Reporting Person serves as a trustee. Shares are held by the Zuk 2015 GRAT dated June 17, 2015, for which the Reporting Person serves as a trustee. This Form 4 is amended because the shares in Column 4 were inadvertently understated as originally reported. /s/ Jeff True, Attorney-in-Fact for Nir Zuk 2019-04-25