X0306 4 2019-11-22 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 2019-11-22 5 G 0 20000 0.00 D 6306828 D Common Stock 2019-12-02 4 S 0 32538 103.0957 D 6274290 D Common Stock 2019-12-02 4 S 0 66162 103.9066 D 6208128 D Common Stock 2019-12-02 4 S 0 1300 105.1754 D 6206828 D Common Stock 3618214 I See footnote Common Stock 1991686 I See footnote The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. Represents the aggregate of sales effected on the same day at different prices. Represents the weighted average sale price. The lowest price at which shares were sold was $102.57 and the highest price at which shares were sold was $103.57. The reporting person undertakes to provide upon request to the staff of the Securities Exchange Commission, the issuer or its stockholders, full information regarding the total number of shares sold at each separate price within the ranges set forth in footnotes (3), (4) and (5) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $103.58 and the highest price at which shares were sold was $104.40. Represents the weighted average sale price. The lowest price at which shares were sold was $104.64 and the highest price at which shares were sold was $105.22. .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 2010 K.A. Family Trust dated May 3, 2010, for which the Reporting Person serves as a trustee. /s/ John Whittle, by power of attorney 2019-12-03