X0306 4 2016-11-01 0 0001262039 FORTINET INC FTNT 0001475586 Xie Michael C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 1 1 0 0 VP, Engineering & CTO Common Stock 2016-11-01 4 M 0 2500 0 A 6484500 D Common Stock 2016-11-01 4 M 0 2500 0 A 6487000 D Common Stock 2016-11-01 4 M 0 2500 0 A 6489500 D Common Stock 2016-11-01 4 F 0 3915 31.76 D 6485585 D Common Stock 2016-11-02 4 S 0 3585 31.7665 D 6482000 D Common Stock 1632913 I See Footnote Common Stock 1632913 I See Footnote Common Stock 1991686 I See Footnote Common Stock 462488 I See footnote Restricted Stock Units 0 2016-11-01 4 M 0 2500 0 D Common Stock 2500 2500 D Restricted Stock Units 0 2016-11-01 4 M 0 2500 0 D Commn Stock 2500 12500 D Restricted Stock Units 0 2016-11-01 4 M 0 2500 0 D Common Stock 2500 22500 D Vesting of RSUs granted to the Reporting Person on February 13, 2013. Vesting of RSUs granted to the Reporting Person on February 12, 2014. Vesting of RSUs granted to the Reporting Person on February 11, 2015. 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 RSUs. The price per share was based on the fair market value of the Issuer's common stock on the vesting and release date. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 9, 2016. Represents the aggregate of sales effected on the same day at different prices Represents the weighted average sales price per share. The shares sold at prices ranging from $31.65 to $31.93 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. Shares held directly by the 2014 Michael Xie Grantor Retained Annuity Trust dated March 6, 2014, for which the Reporting Person serves as a trustee. Shares held directly by the 2014 Danke Wu Grantor Retained Annuity Trust dated March 6, 2014, for which the Reporting Person serves as a trustee. Shares held directly by the 2010 K.A. Family Trust dated May 3, 2010, for which the Reporting Person serves as a trustee. Shares held directly by The K.A. Children's Trust dated February 9, 2011, for which the Reporting Person serves as a trustee. Each RSU represents a contingent right to receive one share of the Issuer's common stock. 25% of the RSUs vested on February 1, 2014, 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. 25% of the RSUs vest on February 1, 2015, 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. 25% of the RSUs vest on February 1, 2016, 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. /s/ Robert Turner, by power of attorney 2016-11-03