X0306 4 2020-08-12 0 0001262039 Fortinet, Inc. FTNT 0001418649 Jensen Keith C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 0 1 0 0 CFO & Chief Accounting Officer Common Stock 2020-08-12 4 S 0 2599 126.5375 D 1788 D Common Stock 2020-08-12 4 S 0 1001 127.4278 D 787 D The transactions reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person. Represents the weighted average sale price. The lowest price at which shares were sold was $126.07 and the highest price at which shares were sold was $126.95. 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 (2) and (3) to this Form 4. Represents the weighted average sale price. The lowest price at which shares were sold was $127.19 and the highest price at which shares were sold was $127.57. /s/ Robert Turner, by power of attorney 2020-08-13