X0306 4 2015-02-04 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 2015-02-04 4 S 0 15000 30.9320 D 6377863 D Common Stock 2015-02-04 4 S 0 15000 30.9076 D 547488 I See footnote Common Stock 2668756 I See footnote Common Stock 2668756 I See footnote The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 2, 2014. 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 $30.34 to $31.22 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. Represents the weighted average sales price per share. The shares sold at prices ranging from $30.38 to $31.20 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 K.A. Children's Trust dated February 9, 2011, for which the Reporting Person serves as a trustee. 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. /s/ John Whittle, by power of attorney 2015-02-04