X0306 4 2019-02-14 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 2019-02-14 4 S 0 1805 82.8211 D 4142 D Common Stock 2019-02-14 4 S 0 3145 83.3367 D 997 D Common Stock 2019-02-15 4 S 0 328 83.36 D 669 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 20, 2018. 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 $82.10 to $83.09 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. Includes shares acquired by the Reporting Person under the Issuer's employee stock purchase plan on February 14, 2019. Represents the weighted average sales price per share. The shares sold at prices ranging from $83.10 to $83.62 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. /s/ Robert Turner, by power of attorney 2019-02-19