X0306 4 2023-02-01 0 0001262039 Fortinet, Inc. FTNT 0001475587 Xie Ken C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 1 1 0 0 President & CEO Common Stock 2023-02-01 4 M 0 15310 0.00 A 48283824 D Common Stock 2023-02-01 4 M 0 12845 0.00 A 48296669 D Common Stock 2023-02-01 4 M 0 11335 0.00 A 48308004 D Common Stock 2023-02-01 4 M 0 24065 0.00 A 48332069 D Common Stock 2023-02-01 4 F 0 28800 53.09 D 48303269 D Restricted Stock Units 0.00 2023-02-01 4 M 0 15310 0.00 D Common Stock 15310 0 D Restricted Stock Units 0.00 2023-02-01 4 M 0 12845 0.00 D Common Stock 12845 51375 D Restricted Stock Units 0.00 2023-02-01 4 M 0 11335 0.00 D Common Stock 11335 90670 D Restricted Stock Units 0.00 2023-02-01 4 M 0 24065 0.00 D Common Stock 24065 72200 D Vesting of restricted stock units ("RSUs") previously granted to the Reporting Person. Exempt transaction pursuant to Section 16b-3(e) - payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3. All of the shares reported as disposed of in this Form 4 were relinquished by the Reporting Person and cancelled by the Issuer in exchange for the Issuer's agreement to pay federal and state tax withholding obligations of the Reporting Person resulting from the vesting of restricted stock units. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon vesting. 25% of the RSUs vested on February 1, 2020, then the remaining 75% of the RSUs vest in equal installments on each quarterly anniversary thereafter until the RSUs are 100% vested, subject to the continuing employment of the Reporting Person 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. 25% of the RSUs vested on February 1, 2021, 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. 25% of the RSUs vested on February 1, 2022, 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. 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. /s/ Robert Turner, by power of attorney 2022-02-02