X0306 4 2022-02-17 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 2022-02-17 4 S 0 700 310.3043 D 3783 D Common Stock 2022-02-17 4 S 0 500 311.476 D 3283 D Common Stock 2022-02-17 4 S 0 300 312.4133 D 2983 D Common Stock 2022-02-17 4 S 0 501 313.7755 D 2482 D Common Stock 2022-02-17 4 S 0 1000 315.194 D 1482 D Common Stock 2022-02-17 4 S 0 599 315.9902 D 883 D Restricted Stock Units 0.00 2022-02-17 4 A 0 6049 0.00 D Common Stock 6049 6049 D Employee Stock Option (right to buy) 310.54 2022-02-17 4 A 0 18147 0.00 D 2029-02-17 Common Stock 18147 181470 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 $309.84 and the highest price at which shares were sold was $310.74. 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) through (7) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $310.92 and the highest price at which shares were sold was $311.83. Represents the weighted average sale price. The lowest price at which shares were sold was $312.04 and the highest price at which shares were sold was $312.60. Represents the weighted average sale price. The lowest price at which shares were sold was $313.43 and the highest price at which shares were sold was $314.14. Represents the weighted average sale price. The lowest price at which shares were sold was $314.68 and the highest price at which shares were sold was $315.65. Represents the weighted average sale price. The lowest price at which shares were sold was $315.69 and the highest price at which shares were sold was $316.33. Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock. 25% of the RSUs will vest on February 1, 2023, and the remaining 75% of the RSUs will vest in equal installments on each quarterly anniversary thereafter, until such time as the RSUs are 100% vested, subject to the Reporting Person's provision of service to the Issuer on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon vesting. RSUs do not expire; they either vest or are canceled prior to the vesting date. 1/4 of the shares subject to the option will vest on February 17, 2023, 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 2022-02-18