<SEC-DOCUMENT>0001140361-17-027912.txt : 20170714
<SEC-HEADER>0001140361-17-027912.hdr.sgml : 20170714
<ACCEPTANCE-DATETIME>20170714191832
ACCESSION NUMBER:		0001140361-17-027912
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170714
FILED AS OF DATE:		20170714
DATE AS OF CHANGE:		20170714

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FORTINET INC
		CENTRAL INDEX KEY:			0001262039
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER PERIPHERAL EQUIPMENT, NEC [3577]
		IRS NUMBER:				770560389
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		899 KIFER ROAD
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086
		BUSINESS PHONE:		408-235-7700

	MAIL ADDRESS:	
		STREET 1:		899 KIFER ROAD
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Cohen Peter Dale Jr.
		CENTRAL INDEX KEY:			0001710083

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34511
		FILM NUMBER:		17966366

	MAIL ADDRESS:	
		STREET 1:		C/O FORTINET, INC.
		STREET 2:		899 KIFER ROAD
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94086
</SEC-HEADER>
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<SEQUENCE>1
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<DESCRIPTION>FORM 3
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<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-07-14</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001262039</issuerCik>
        <issuerName>FORTINET INC</issuerName>
        <issuerTradingSymbol>FTNT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001710083</rptOwnerCik>
            <rptOwnerName>Cohen Peter Dale Jr.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FORTINET, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>899 KIFER ROAD</rptOwnerStreet2>
            <rptOwnerCity>SUNNYVALE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94086</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>467</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ John Whittle, by power of attorney</signatureName>
        <signatureDate>2017-07-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<TYPE>EX-24
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<title></title>
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<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; TEXT-ALIGN: center"><u>POWER OF ATTORNEY</u></div>

<div>&#160;</div>

<div><br>
</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">KNOW ALL MEN BY THESE PRESENTS</font>, that the undersigned hereby constitutes and appoints Ken Xie, John Whittle and Robert Turner, and each of them, as his true and lawful attorney-in-fact to:</div>

<div><br>
</div>

<div style="TEXT-ALIGN: justify; TEXT-INDENT: 72pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">(1)</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; DISPLAY: inline-block; WIDTH: 36pt">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">execute for and on behalf of the undersigned, in the undersigned's capacity as a representative of Fortinet, Inc. (the "<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; FONT-STYLE: italic">Company</font>"), any and all Form ID, or Form 3, 4 or 5 reports and any amendments thereto required to be filed by the undersigned in accordance with Section 16(a) of the Securities Exchange Act of 1934 (the "<font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold; FONT-STYLE: italic">Exchange Act</font>") and the rules thereunder with respect to transactions in the Company's securities;</font></div>

<div>&#160;</div>

<div style="TEXT-ALIGN: justify; TEXT-INDENT: 72pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">(2)</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; DISPLAY: inline-block; WIDTH: 36pt">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form ID, or Form 3, 4 or 5 report and any amendments thereto and timely file such report with the U.S. Securities and Exchange Commission and any stock exchange or similar authority; and</font></div>

<div>&#160;</div>

<div style="TEXT-ALIGN: justify; TEXT-INDENT: 72pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">(3)</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; DISPLAY: inline-block; WIDTH: 36pt">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif">take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney&#8209;in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney&#8209;in-fact on behalf of the undersigned, pursuant to this Power of Attorney, shall be in such form and shall contain such terms and conditions as such attorney&#8209;in-fact may approve in his or her discretion.</font></div>

<div>&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform each and every act and thing whatsoever requisite, necessary, and proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or his or her substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.&#160; The undersigned acknowledges that no such attorney&#8209;in-fact, in serving in such capacity at the request of the undersigned, is hereby assuming, nor is the Company hereby assuming, any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act.</div>

<div>&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt">This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Form 3, 4 or 5 reports with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys&#8209;in-fact.</div>

<div>&#160;</div>

<div style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; TEXT-ALIGN: justify; TEXT-INDENT: 36pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif; FONT-WEIGHT: bold">IN WITNESS WHEREOF</font>, the undersigned has caused this Power of Attorney to be executed as of this 20th day of June, 2017.</div>

<div><br>
</div>

<div><br>
</div>

<div style="TEXT-ALIGN: left; MARGIN-LEFT: 216pt; TEXT-INDENT: 36pt"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif"><u>/s/ Peter Dale Cohen, Jr.</u></font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; DISPLAY: inline-block; WIDTH: 216pt">&#160;</font><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif"><font style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman', Times, serif"><br>
</font><font id="TRGRRTFtoHTMLTab" style="FONT-SIZE: 1px; DISPLAY: inline-block; WIDTH: 36pt">&#160;</font>Peter Dale Cohen, Jr.</font></div>

<br>
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