<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001487101</cik>
        <entityName>KEYW HOLDING CORP</entityName>
        <issuerAddress>
            <street1>1334 ASHTON ROAD</street1>
            <street2>SUITE A</street2>
            <city>HANOVER</city>
            <stateOrCountry>MD</stateOrCountry>
            <zipCode>21076</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>443-270-5300</issuerPhoneNumber>
        <jurisdictionOfInc>MARYLAND</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2009</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <middleName>E.</middleName>
                <lastName>Krobath</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Leonard</firstName>
                <middleName>E.</middleName>
                <lastName>Moodispaw</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Randall</firstName>
                <middleName>M.</middleName>
                <lastName>Griffin</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>John</firstName>
                <lastName>Hannon</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kenneth</firstName>
                <lastName>Minihan</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Arthur</firstName>
                <lastName>Money</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Caroline</firstName>
                <lastName>Pisano</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Sutie A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William</firstName>
                <lastName>Campbell</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>The KEYW Holding Corporation</street1>
                <street2>1334 Ashton Road, Suite A</street2>
                <city>Hanover</city>
                <stateOrCountry>MD</stateOrCountry>
                <zipCode>21076</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Technology</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-03-15</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
            <isDebtType>true</isDebtType>
            <isOptionToAcquireType>true</isOptionToAcquireType>
            <isSecurityToBeAcquiredType>true</isSecurityToBeAcquiredType>
            <isOtherType>true</isOtherType>
            <descriptionOfOtherType>Aggregate offering of Notes, and Warrants exercisable for up to 200,000 shares of common stock</descriptionOfOtherType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>10000000</totalOfferingAmount>
            <totalAmountSold>8000000</totalAmountSold>
            <totalRemaining>2000000</totalRemaining>
            <clarificationOfResponse>Aggregate offering of up to $10,000,000 in Notes, and Warrants exercisable for shares of common stock</clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>4</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>KEYW HOLDING CORP</issuerName>
                <signatureName>/s/ John E. Krobath</signatureName>
                <nameOfSigner>John E. Krobath</nameOfSigner>
                <signatureTitle>Chief Financial Officer</signatureTitle>
                <signatureDate>2010-03-26</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
