X0306 4 2020-02-25 0 0001262039 Fortinet, Inc. FTNT 0001418649 Jensen Keith C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 CFO & Chief Accounting Officer Common Stock 2020-02-25 4 M 0 2501 49.06 A 5128 D Common Stock 2020-02-25 4 M 0 600 84.49 A 5728 D Common Stock 2020-02-25 4 S 0 1201 105.4613 D 4527 D Common Stock 2020-02-25 4 S 0 1100 106.4445 D 3427 D Common Stock 2020-02-25 4 S 0 100 107.78 D 3327 D Common Stock 2020-02-25 4 S 0 700 109.4943 D 2627 D Employee Stock Option (right to buy) 49.06 2020-02-25 4 M 0 2501 0.00 D 2025-02-20 Common Stock 2500 20000 D Employee Stock Option 84.49 2020-02-25 4 M 0 600 0.00 D 2026-02-21 Common Stock 600 46536 D The sales 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 $104.97 and the highest price at which shares were sold was $105.93. 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 $106.21 and the highest price at which shares were sold was $106.74. Represents the weighted average sale price. The lowest price at which shares were sold was $109.11 and the highest price at which shares were sold was $109.61. 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 2020-02-27