<SEC-DOCUMENT>0000921895-11-002104.txt : 20111107
<SEC-HEADER>0000921895-11-002104.hdr.sgml : 20111107
<ACCEPTANCE-DATETIME>20111107193317
ACCESSION NUMBER:		0000921895-11-002104
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20111104
FILED AS OF DATE:		20111107
DATE AS OF CHANGE:		20111107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Galvin Paul M.
		CENTRAL INDEX KEY:			0001532974

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22563
		FILM NUMBER:		111185932

	MAIL ADDRESS:	
		STREET 1:		C/O SG BLOCKS, INC.
		STREET 2:		400 MADISON AVENUE, SUITE 16C
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CDSI HOLDINGS INC
		CENTRAL INDEX KEY:			0001023994
		STANDARD INDUSTRIAL CLASSIFICATION:	BLANK CHECKS [6770]
		IRS NUMBER:				954463937
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		100 S E SECOND STREET
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33131
		BUSINESS PHONE:		3055798000

	MAIL ADDRESS:	
		STREET 1:		100 S E SECOND STREET
		CITY:			MIAMI
		STATE:			FL
		ZIP:			33131

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PC411 INC
		DATE OF NAME CHANGE:	19961001
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>form308066003c_11072011.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-11-04</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001023994</issuerCik>
        <issuerName>CDSI HOLDINGS INC</issuerName>
        <issuerTradingSymbol>CSDI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001532974</rptOwnerCik>
            <rptOwnerName>Galvin Paul M.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SG BLOCKS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>400 MADISON AVENUE, SUITE 16C</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2658127</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By TAG Partners, LLC</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Such shares are held by TAG Partners, LLC, (&quot;TAG&quot;) an investment partnership formed for the purpose of investing in privately held SG Blocks, Inc. (&quot;Former SG&quot;), into which a wholly owned subsidiary of the Issuer merged on November 4, 2011. Upon consummation of such merger, Former SG became a wholly owned subsidiary of the Issuer and such shares were issued to TAG. Paul Galvin is a manager member of, and has a controlling interest in, TAG and may be deemed to beneficially own the shares of common stock owned by TAG. Mr. Galvin specifically disclaims beneficial ownership of the shares of common stock held by TAG, except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Paul Galvin</signatureName>
        <signatureDate>2011-11-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
