-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 ODG45zuSYJAsvkupTu+/PtcDGz4ekA3g1+4B3okt6/O3/GlV7wigqWhjpSD6yhVy
 DCKoa1UWdnV1/LRpAmwHRw==

<SEC-DOCUMENT>0001104659-05-010943.txt : 20050314
<SEC-HEADER>0001104659-05-010943.hdr.sgml : 20050314
<ACCEPTANCE-DATETIME>20050314215034
ACCESSION NUMBER:		0001104659-05-010943
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050310
FILED AS OF DATE:		20050314
DATE AS OF CHANGE:		20050314

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GENUS INC
		CENTRAL INDEX KEY:			0000837913
		STANDARD INDUSTRIAL CLASSIFICATION:	SPECIAL INDUSTRY MACHINERY, NEC [3559]
		IRS NUMBER:				942790804
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1139 KARLSTAD DRIVE
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089-2117
		BUSINESS PHONE:		4087477120

	MAIL ADDRESS:	
		STREET 1:		1139 KARLSTAD DRIVE
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94089-2117

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FORSYTH GERALD FREDERICK
		CENTRAL INDEX KEY:			0001218529

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-17139
		FILM NUMBER:		05679957

	BUSINESS ADDRESS:	
		STREET 1:		120 TERESITA WAY
		CITY:			LOS GATOS
		STATE:			CA
		ZIP:			95032
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-03-10</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000837913</issuerCik>
        <issuerName>GENUS INC</issuerName>
        <issuerTradingSymbol>GGNS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001218529</rptOwnerCik>
            <rptOwnerName>FORSYTH GERALD FREDERICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1139 KARLSTAD DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SUNNYVALE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94089</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-03-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>U</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>37500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-03-10</value>
            </exerciseDate>
            <expirationDate>
                <value>2005-06-10</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Am Dep Shares</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19125</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19125</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Options are exercisable in exchange for shares of AIXTRON American depositary shares (on a .51 for each Genus share basis) pursuant to the terms of the Agreement and Plan of Merger dated July 1, 2004 between the Company and AIXTRON AG which became effective on March 10, 2005 (the &quot;Closing Date&quot;).  The options are fully-vested as of the Closing Date and shall be exercisable within thirty days from the Closing Date.</footnote>
        <footnote id="F2">Each outstanding option shall be converted, upon exercise, into the right to receive .51 AIXTRON American depositary shares (for each Genus share) with an exercise price equal to the exercise price of the derivative security as stated in the stock option agreements between Mr. Forsyth and the Company divided by the conversion ratio of .51.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Irene Dunlop, by power of attorney</signatureName>
        <signatureDate>2005-03-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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