Fortinet, Inc. — Director's Dealing 2010

May 27, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FORTINET INC (FTNT)
CIK: 0001262039
Period of Report: 2010-05-25

Reporting Person: Whittle John (VP & General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-25	Common Stock	M	35000	$2.40	Acquired	35000	Direct
2010-05-25	Common Stock	S	35000	$15.635	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-25	Employee Stock Option (right to buy)	$2.40	M	35000	Disposed	2016-10-26	Common Stock (35000)	Direct

Footnotes

F1: The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 30, 2009, as amended.

F2: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares sold ranging from $15.49 to $15.82 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

F3: One-fourth of the shares subject to the option vested on October 25, 2007 and one forty-eighth of the shares shall vest monthly thereafter.