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        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001475586</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001262039</issuerCik>
            <issuerName>FORTINET INC</issuerName>
            <secFileNumber>001-34511</secFileNumber>
            <issuerAddress>
                <ns2:street1>899 Kifer Road</ns2:street1>
                <ns2:city>Sunnyvale</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>94006</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>4082357700</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>XIE FOUNDATION</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Fl.</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>30000</noOfUnitsSold>
            <aggregateMarketValue>2107800.00</aggregateMarketValue>
            <noOfUnitsOutstanding>767909603</noOfUnitsOutstanding>
            <approxSaleDate>02/13/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/06/2018</acquiredDate>
            <natureOfAcquisitionTransaction>Gift</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Yu-Yi Wu</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>Y</isGiftTransaction>
            <donarAcquiredDate>05/06/2018</donarAcquiredDate>
            <amountOfSecuritiesAcquired>30000</amountOfSecuritiesAcquired>
            <natureOfPayment>NA</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for MICHAEL XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/02/2024</saleDate>
            <amountOfSecuritiesSold>38369</amountOfSecuritiesSold>
            <grossProceeds>2549478.08</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KEN QING XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>01/10/2024</saleDate>
            <amountOfSecuritiesSold>46892</amountOfSecuritiesSold>
            <grossProceeds>2845486.28</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KEN QING XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>01/09/2024</saleDate>
            <amountOfSecuritiesSold>46733</amountOfSecuritiesSold>
            <grossProceeds>2809405.70</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KEN QING XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/13/2023</saleDate>
            <amountOfSecuritiesSold>47306</amountOfSecuritiesSold>
            <grossProceeds>2612313.01</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KEN QING XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/12/2023</saleDate>
            <amountOfSecuritiesSold>47452</amountOfSecuritiesSold>
            <grossProceeds>2606324.83</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>University of California, Berkeley Foundation</name>
                <address>
                    <ns2:street1>1995 University Avenue</ns2:street1>
                    <ns2:street2>Suite 400 </ns2:street2>
                    <ns2:city>Berkeley </ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94704</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/11/2023</saleDate>
            <amountOfSecuritiesSold>3884</amountOfSecuritiesSold>
            <grossProceeds>206995.06</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for MICHAEL XIE</name>
                <address>
                    <ns2:street1>899 Kifer Road</ns2:street1>
                    <ns2:city>Sunnyvale</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94006</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>12/08/2023</saleDate>
            <amountOfSecuritiesSold>25885</amountOfSecuritiesSold>
            <grossProceeds>1327702.31</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY</name>
                <address>
                    <ns2:street1>326 Galvez Street</ns2:street1>
                    <ns2:city>Stanford </ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94305</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>11/22/2023</saleDate>
            <amountOfSecuritiesSold>92400</amountOfSecuritiesSold>
            <grossProceeds>4901764.56</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The Securities were gifted to Xie Foundation by the original holder, Yu-Yi Wu. </remarks>
        <noticeSignature>
            <noticeDate>02/13/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/08/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Michael Xie</signature>
        </noticeSignature>
    </formData>
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144
0001475586
XXXXXXXX
LIVE
0001262039
FORTINET INC
001-34511
899 Kifer Road
Sunnyvale
CA
94006
4082357700
XIE FOUNDATION
Director
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
30000
2107800.00
767909603
02/13/2024
NASDAQ
Common
05/06/2018
Gift
Yu-Yi Wu
Y
05/06/2018
30000
NA
N
10b5-1 Sales for MICHAEL XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
02/02/2024
38369
2549478.08
10b5-1 Sales for KEN QING XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
01/10/2024
46892
2845486.28
10b5-1 Sales for KEN QING XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
01/09/2024
46733
2809405.70
10b5-1 Sales for KEN QING XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
12/13/2023
47306
2612313.01
10b5-1 Sales for KEN QING XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
12/12/2023
47452
2606324.83
University of California, Berkeley Foundation
1995 University Avenue
Suite 400
Berkeley
CA
94704
Common
12/11/2023
3884
206995.06
10b5-1 Sales for MICHAEL XIE
899 Kifer Road
Sunnyvale
CA
94006
Common
12/08/2023
25885
1327702.31
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
326 Galvez Street
Stanford
CA
94305
Common
11/22/2023
92400
4901764.56
The Securities were gifted to Xie Foundation by the original holder, Yu-Yi Wu.
02/13/2024
09/08/2023
/s/ Michael Xie