X0407 4 2023-05-23 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 0 Common Stock 2023-05-23 4 M 0 12730 22.90 A 17302 D Common Stock 2023-05-23 4 M 0 11980 34.39 A 29282 D Common Stock 2023-05-23 4 S 0 20201 68.06 D 9081 D Common Stock 2023-05-23 4 S 0 4509 68.7429 D 4572 D Stock Option (right to buy) 22.90 2023-05-23 4 M 0 12730 0.00 D 2027-02-21 Common Stock 12730 38195 D Stock Option (right to buy) 34.39 2023-05-23 4 M 0 11980 0.00 D 2028-02-19 Common Stock 11980 83880 D The reported transaction was effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person on December 8, 2022. Represents the weighted average sale price. The lowest price at which shares were sold was $67.47 and the highest price at which shares were sold was $68.46. The Reporting Person undertakes to provide upon request to the staff of the Securities and 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) and (3) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $68.47 and the highest price at which shares were sold was $69.13. 1/4 of the shares subject to the option vested on February 21, 2021 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 19, 2022, 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 2023-05-24