X0306 4 2015-08-13 0 0001262039 FORTINET INC FTNT 0001189229 PAISLEY CHRISTOPHER B C/O FORTINET, INC. 899 KIFER ROAD SUNNYVALE CA 94086 1 0 0 0 Common Stock 2015-08-13 4 M 0 332 0 A 51725 D Common Stock 2015-08-14 4 M 0 6000 3.84 A 57725 D Common Stock 2015-08-14 4 S 0 6000 46.2811 D 51725 D Restricted Stock Units 0 2015-08-13 4 M 0 332 0 D Common Stock 332 2650 D Non-qualified stock option (right to buy) 3.84 2015-08-14 4 M 0 6000 0 D 2016-04-30 Common Stock 6000 12000 D Vesting of restricted stock units ("RSUs") granted to the Reporting Person on August 13, 2013. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 5, 2015. 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 $46.11 to $46.42 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. Each RSU represents a contingent right to receive one share of the Issuer's common stock. 25% of the RSUs vest on August 13, 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 service of the Reporting Person on each vesting date. Shares of the Issuer's common stock will be delivered to the Reporting Person upon vesting. The option is 100% vested and exercisable. /s/ John Whittle, by power of attorney 2015-08-17