X0306 4 2020-06-22 0 0001262039 Fortinet, Inc. FTNT 0001476336 Whittle John C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 VP Corp Dev&Strat Alliance,GC Common Stock 2020-06-22 4 M 0 625 37.24 A 1894 D Common Stock 2020-06-22 4 M 0 1216 49.06 A 3110 D Common Stock 2020-06-22 4 M 0 699 84.49 A 3809 D Common Stock 2020-06-22 4 S 0 899 137.7123 D 2910 D Common Stock 2020-06-22 4 S 0 100 139.39 D 2810 D Common Stock 2020-06-22 4 S 0 958 142.1931 D 1852 D Common Stock 2020-06-22 4 S 0 583 143.1081 D 1269 D Stock Option (right to buy) 37.24 2020-06-22 4 M 0 625 0.00 D 2024-02-16 Common Stock 625 13750 D Stock Option (right to buy) 49.06 2020-06-22 4 M 0 1216 0.00 D 2025-02-20 Common Stock 1216 44978 D Stock Option (right to buy) 84.49 2020-06-22 4 M 0 699 0.00 D 2026-02-21 Common Stock 699 22397 D The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. Represents the weighted average sale price. The lowest price at which shares were sold was $137.56 and the highest price at which shares were sold was $138.23. The reporting person undertakes to provide upon request to the staff of the Securities Exchange Commission, the issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the ranges set forth in footnotes (2), (3) and (4) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $141.76 and the highest price at which shares were sold was $142.73. Represents the weighted average sale price. The lowest price at which shares were sold was $142.91 and the highest price at which shares were sold was $143.50. 1/4 of the shares subject to the option vested on February 16, 2018 and 1/48 of the shares subject to the option will vest monthly thereafter, subject to the Reporting Person's provision of service to the issuer on each vesting date. 1/4 of the shares subject to the option vested on February 20, 2019 and 1/48 of the shares subject to the option will vest monthly thereafter, subject to the Reporting Person's provision of service to the Issuer on each vesting date. 1/4 of the shares subject to the option vested on February 21, 2020 and 1/48 of the shares subject to the option will vest monthly thereafter, subject to the Reporting Person's provision of service to the Issuer on each vesting date. /s/ Robert Turner, by power of attorney 2020-06-24