X0306 4 2016-02-11 0 0001262039 FORTINET INC FTNT 0001418649 Jensen Keith C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 Chief Accounting Officer Common Stock 2016-02-11 4 M 0 357 0 A 521 D Common Stock 2016-02-11 4 F 0 134 23.83 D 387 D Common Stock 2016-02-16 4 S 0 200 24.58 D 187 D Restricted Stock Units 0 2016-02-11 4 A 0 1070 0 A Common Stock 1070 1070 D Restricted Stock Units 0 2016-02-11 4 M 0 357 0 D Common Stock 357 713 D Restricted Stock Units 0 2016-02-11 4 A 0 15000 0 A Common Stock 15000 15000 D Nonqualified Stock Option (right to buy) 23.83 2016-02-11 4 A 0 10000 0 A 2023-02-11 Common Stock 10000 10000 D Vesting of performance stock units earned by the Reporting Person on February 11, 2016. 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 on this line 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 ("RSUs") . The Reporting Person did not sell or otherwise dispose of any of the shares reported on this Form 4 for any reason other than to cover required taxes. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2015. Each RSU represents a contingent right to receive one share of the Issuer's common stock. 357 shares vest on February 11,2016. 50% of the remaining RSUs will vest on February 11, 2017 and 50% will vest on February 11, 2018. Shares of the Issuer's common stock will be delivered to the Reporting Person upon vesting. 25% of the RSUs vest on February 1, 2017, then the remaining 75% of the RSUs vest in equal installments on each quarterly anniversary thereafter, until such time as 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. 1/4 of the shares subject to the option vest on February 11, 2017 and 1/48 of the shares subject to the option vest monthly thereafter. /s/ Robert Turner, by power of attorney 2016-02-16