X0306 4 2023-02-09 0 0001262039 Fortinet, Inc. FTNT 0001924858 Perche Patrice C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 Chief Revenue Off./EVP Supp. Common Stock 2023-02-09 4 M 0 52085 9.81 A 217819 D Common Stock 2023-02-09 4 M 0 164470 16.90 A 382289 D Common Stock 2023-02-09 4 M 0 133250 22.90 A 515539 D Common Stock 2023-02-09 4 M 0 85685 34.39 A 601224 D Common Stock 2023-02-09 4 S 0 280515 58.0584 D 320709 D Common Stock 2023-02-09 4 S 0 112035 59.1563 D 208674 D Common Stock 2023-02-09 4 S 0 179065 60.2338 D 29609 D Common Stock 2023-02-09 4 S 0 3879 60.721 D 25730 D Stock Option (right to buy) 9.81 2023-02-09 4 M 0 52085 0.00 D 2025-02-20 Common Stock 52085 0 D Stock Option (right to buy) 16.90 2023-02-09 4 M 0 164470 0.00 D 2026-02-21 Common Stock 164470 3500 D Stock Option (right to buy) 22.90 2023-02-09 4 M 0 133250 0.00 D 2027-02-21 Common Stock 133250 49495 D Stock Option (right to buy) 34.39 2023-02-09 4 M 0 85685 0.00 D 2028-02-19 Common Stock 85685 93145 D The reported transaction was 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 $57.67 and the highest price at which shares were sold was $58.66. 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) through (5) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $58.67 and the highest price at which shares were sold was $59.66. Represents the weighted average sale price. The lowest price at which shares were sold was $59.67 and the highest price at which shares were sold was $60.66. Represents the weighted average sale price. The lowest price at which shares were sold was $60.67 and the highest price at which shares were sold was $60.82. 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. 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 2023-02-10