X0407 4 2023-05-01 0 0001262039 Fortinet, Inc. FTNT 0001475587 Xie Ken C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 1 1 0 0 President & CEO 0 Common Stock 2023-05-01 4 M 0 12845 0.00 A 48316114 D Common Stock 2023-05-01 4 M 0 11335 0.00 A 48327449 D Common Stock 2023-05-01 4 M 0 6015 0.00 A 48333464 D Common Stock 2023-05-01 4 F 0 15124 62.81 D 48318340 D Common Stock 7500000 I By trust Common Stock 7500000 I By trust Restricted Stock Units 0.00 2023-05-01 4 M 0 12845 0.00 D Common Stock 12845 38530 D Restricted Stock Units 0.00 2023-05-01 4 M 0 11335 0.00 D Common Stock 11335 79335 D Restricted Stock Units 0.00 2023-05-01 4 M 0 6015 0.00 D Common Stock 6015 66185 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. These securities are held by a grantor retained annuity trust for the benefit of the Reporting Person. These securities are held by a grantor retained annuity trust for the benefit of the Reporting Person's spouse. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon settlement. 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 settlement. RSUs do not expire; they either vest or are canceled prior to the vesting date. 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 settlement. 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 settlement. /s/ Robert Turner, by power of attorney 2023-05-03