X0306 4 2017-10-10 0 0001327567 Palo Alto Networks Inc PANW 0001309507 MCLAUGHLIN MARK D C/O PALO ALTO NETWORKS INC. 3000 TANNERY WAY SANTA CLARA CA 95054 1 1 0 0 Chief Executive Officer Common Stock 2017-10-10 4 M 0 25000 10.77 A 307774 D Common Stock 2017-10-10 4 S 0 25000 149.703 D 282774 D Common Stock 2017-10-10 4 S 0 10000 149.697 D 65000 I See footnote Common Stock 125000 I See footnote Employee Stock Option (right to buy) 10.77 2017-10-10 4 M 0 25000 0.00 D 2021-09-29 Common Stock 25000 744935 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. This sale price represents the weighted average sale price of the shares sold ranging from $149.50 to $150.00 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. Shares are held by the McLaughlin GRAT II, for which the Reporting Person serves as a trustee. Shares are held by the McLaughlin GRAT I, for which the Reporting Person serves as a trustee. The shares subject to the option are fully vested and exercisable. /s/ Jeff True, Attorney-in-Fact for Mark D. McLaughlin 2017-10-12