<SEC-DOCUMENT>0000807863-18-000069.txt : 20181108
<SEC-HEADER>0000807863-18-000069.hdr.sgml : 20181108
<ACCEPTANCE-DATETIME>20181108162833
ACCESSION NUMBER:		0000807863-18-000069
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20181106
FILED AS OF DATE:		20181108
DATE AS OF CHANGE:		20181108

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CARNECCHIA SCIPIO MAXIMUS
		CENTRAL INDEX KEY:			0001255170

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35231
		FILM NUMBER:		181170071

	MAIL ADDRESS:	
		STREET 1:		C/O MITEK SYSTEMS, INC.
		STREET 2:		600 B STREET, SUITE 100
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MITEK SYSTEMS INC
		CENTRAL INDEX KEY:			0000807863
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER PERIPHERAL EQUIPMENT, NEC [3577]
		IRS NUMBER:				870418827
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		600 B STREET
		STREET 2:		SUITE 100
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92101
		BUSINESS PHONE:		619-269-6800

	MAIL ADDRESS:	
		STREET 1:		600 B STREET
		STREET 2:		SUITE 100
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92101
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_154171249615942.xml
<DESCRIPTION>FORM 4
<TEXT>
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    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-11-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000807863</issuerCik>
        <issuerName>MITEK SYSTEMS INC</issuerName>
        <issuerTradingSymbol>MITK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001255170</rptOwnerCik>
            <rptOwnerName>CARNECCHIA SCIPIO MAXIMUS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>600 B STREET, SUITE 100</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO &amp; Director</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Stock</value>
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            <transactionDate>
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            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>47369</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
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                    <value>D</value>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
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            <transactionDate>
                <value>2018-11-06</value>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
                <value>2028-11-06</value>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <transactionShares>
                    <value>81240</value>
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                <transactionPricePerShare>
                    <value>9.50</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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                <value>2028-11-06</value>
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                    <value>Common Stock</value>
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                    <value>172179</value>
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                    <value>D</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Performance Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.5</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2018-11-06</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>800000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F5"/>
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            <expirationDate>
                <value>2028-11-06</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>800000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>972179</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents restricted stock units granted on November 6, 2018. Shares subject to the award vest over four years from the date of grant, with 25% of the shares subject to the award vesting on the first anniversary of the date of grant and the remaining shares vesting in three equal annual installments thereafter.</footnote>
        <footnote id="F2">Represents conditional restricted stock units granted on November 2, 2018. Shares subject to the award vest over five years from the date of grant, with 25% of the shares subject to the award vesting on the second anniversary of the date of grant and the remaining shares vesting in three equal annual installments thereafter.</footnote>
        <footnote id="F3">Represents a non-qualified stock option granted on November 6, 2018. Shares subject to the award vest over four years from the date of grant, with 25% of the shares subject to the award vesting on the first anniversary of the date of grant and the remaining shares vesting in thirty-six equal monthly installments thereafter.</footnote>
        <footnote id="F4">Represents a conditional non-qualified stock option granted on November 6, 2018. Shares subject to the award vest over five years from the date of grant, with 25% of the shares subject to the award vesting on the second anniversary of the date of grant and the remaining shares vesting in thirty-six equal monthly installments thereafter.</footnote>
        <footnote id="F5">Represents a performance non-qualified stock option granted on November 6, 2018. Shares subject to the award vest upon the closing market price of the Mitek's common stock achieving certain predetermined levels and Mr. Carnecchia's serving as Mitek's Chief Executive Officer for at least three years. In the event of a change of control of Mitek, all of the unvested shares subject to the award will vest if the per share price payable to Mitek's stockholders in connection with the change of control of Mitek is an amount reaching those certain predetermined levels required for the shares subject to the award to otherwise vest.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Trevor Renfield, by Power of Attorney</signatureName>
        <signatureDate>2018-11-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
