X0508 4 2023-07-21 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. 0 Common Stock 2023-07-21 4 M 0 3805 22.90 A 29535 D Common Stock 2023-07-21 4 M 0 3725 34.39 A 33260 D Common Stock 2023-07-21 4 S 0 7530 78.4852 D 25730 D Stock Option (right to buy) 22.90 2023-07-21 4 M 0 3805 0.00 D 2027-02-21 Common Stock 3805 26655 D Stock Option (right to buy) 34.39 2023-07-21 4 M 0 3725 0.00 D 2028-02-19 Common Stock 3725 70790 D The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 6, 2022 and modified on December 6, 2022. Represents the weighted average sale price. The lowest price at which shares were sold was $78.11 and the highest price at which shares were sold was $78.99. 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 range set forth herein. 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 2023-07-24