-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 il3F4jru21OxtvEN4U6BWQ==

<SEC-DOCUMENT>0001209191-05-036428.txt : 20050711
<SEC-HEADER>0001209191-05-036428.hdr.sgml : 20050711
<ACCEPTANCE-DATETIME>20050711121046
ACCESSION NUMBER:		0001209191-05-036428
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050629
FILED AS OF DATE:		20050711
DATE AS OF CHANGE:		20050711

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CHYRON CORP
		CENTRAL INDEX KEY:			0000020232
		STANDARD INDUSTRIAL CLASSIFICATION:	PHOTOGRAPHIC EQUIPMENT & SUPPLIES [3861]
		IRS NUMBER:				112117385
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5 HUB DR
		CITY:			MELVILLE
		STATE:			NY
		ZIP:			11747
		BUSINESS PHONE:		6318452000

	MAIL ADDRESS:	
		STREET 1:		5 HUB DRIVE
		CITY:			MELVILLE
		STATE:			NY
		ZIP:			11747

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COMPUTER EXCHANGE INC
		DATE OF NAME CHANGE:	19760114

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LONDON MERCHANT SECURITIES PLC
		CENTRAL INDEX KEY:			0001038946
		STATE OF INCORPORATION:			X0
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-05110
		FILM NUMBER:		05947343

	BUSINESS ADDRESS:	
		STREET 1:		CARLTON HOUSE
		STREET 2:		33 ROBERT ADAM ST
		CITY:			LONDON
		STATE:			X0
		ZIP:			00000

	MAIL ADDRESS:	
		STREET 1:		CARLTON HOUSE
		STREET 2:		33 ROBERT ADAM ST
		CITY:			LONDON
		STATE:			X0
		ZIP:			00000
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>y10621_lms.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-06-29</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000020232</issuerCik>
        <issuerName>CHYRON CORP</issuerName>
        <issuerTradingSymbol>CYRO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001038946</rptOwnerCik>
            <rptOwnerName>LONDON MERCHANT SECURITIES PLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>33 ROBERT ADAM STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LONDON W1U 3HR ENGLAND</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock by LMS Tiger Investments Limited</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3715391</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock by Westpool Investment Trust plc</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3024069</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock by Lion Investments Limited</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>11350</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Debenture by Westpool Investment Trust plc</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.65</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-02-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2006-12-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>785555</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Debenture by Lion Investments Limited</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.65</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2004-02-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2006-12-31</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>370284</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">LMS Tiger Investments Limited (&quot;Tiger&quot;) currently owns 3,715,391 shares of Common Stock par value $0.01 per share (the &quot;Common Stock&quot;) in Chyron Corporation (the &quot;Issuer&quot;). Tiger is an investment company wholly-owned by LMS Capital Limited (&quot;Capital&quot;). Capital is an investment company wholly-owned by the reporting person, London Merchant Securities plc (&quot;LMS&quot;). By virtue of this relationship, LMS can be deemed an indirect beneficial owner of all the securities owned by Tiger.</footnote>
        <footnote id="F2">Westpool Investment Trust plc (&quot;Westpool&quot;) currently owns 3,024,069 shares of Common Stock of the Issuer. 3,000,000 of these shares were purchased pursuant to a private placement transaction under a letter Agreement dated June 29, 2005 for $0.20 per share. Westpool received 24,069 shares of Common Stock upon the exercise of 6,343 Series A Warrants expiring December 31, 2004 (the &quot;Series A Warrants&quot;) and 17,726 Series B Warrants expiring December 31, 2004 (the &quot;Series B Warrants&quot;) on December 27, 2004. Westpool also owns debentures that permit it to acquire 785,555 shares of Common Stock at a conversion price of $0.65 per share. Westpool is an investment company wholly-owned by Capital. Capital is an investment company wholly-owned by LMS. By virtue of this relationship, LMS can be deemed an indirect beneficial owner of all the securities owned by Westpool.</footnote>
        <footnote id="F3">Lion Investments Limited (&quot;Lion&quot;) currently owns 11,350 shares of Common Stock of the Issuer. Lion received these shares upon the exercise of 3,018 Series A Warrants and 8,332 Series B Warrants on December 27, 2004. Lion also owns debentures that permit it to acquire 370,284 shares of Common Stock at a conversion price of $0.65 per share. Lion is an investment company wholly-owned by Capital. Capital is an investment company wholly-owned by LMS. By virtue of this relationship, LMS can be deemed an indirect beneficial owner of all the securities owned by Lion.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Martin Pexton</signatureName>
        <signatureDate>2005-07-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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