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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 R8qXvfod5gqD6xvBDWXHqq4xCWJ7QoLuQeqHBt/coD5olecy/xf7m2K83IVdqhmK
 5BBXVvPg5g+AVzzE/y2wQw==

<SEC-DOCUMENT>0001005477-08-005979.txt : 20081003
<SEC-HEADER>0001005477-08-005979.hdr.sgml : 20081003
<ACCEPTANCE-DATETIME>20081003160625
ACCESSION NUMBER:		0001005477-08-005979
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081001
FILED AS OF DATE:		20081003
DATE AS OF CHANGE:		20081003

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MORRIS WILLIAM C
		CENTRAL INDEX KEY:			0001135080

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21488
		FILM NUMBER:		081106785

	MAIL ADDRESS:	
		STREET 1:		J&W SELIGMAN & CO INC
		STREET 2:		100 PARK AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CATALYST SEMICONDUCTOR INC
		CENTRAL INDEX KEY:			0000899636
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				770083129
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0430

	BUSINESS ADDRESS:	
		STREET 1:		2975 STENDER WAY
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054-3214
		BUSINESS PHONE:		4085421000

	MAIL ADDRESS:	
		STREET 1:		2975 STENDER WAY
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95054-3214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SELIGMAN J & W & CO INC /NY/
		CENTRAL INDEX KEY:			0000350440
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21488
		FILM NUMBER:		081106784

	BUSINESS ADDRESS:	
		STREET 1:		100 PARK AVENUE - 8TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10006
		BUSINESS PHONE:		212-850-1864

	MAIL ADDRESS:	
		STREET 1:		100 PARK AVENUE
		STREET 2:		100 PARK AVENUE 8TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar123.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-10-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000899636</issuerCik>
        <issuerName>CATALYST SEMICONDUCTOR INC</issuerName>
        <issuerTradingSymbol>CATS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000350440</rptOwnerCik>
            <rptOwnerName>SELIGMAN J &amp; W &amp; CO INC /NY/</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>8TH FL.</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001135080</rptOwnerCik>
            <rptOwnerName>MORRIS WILLIAM C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-10-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>112800</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4.54</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1884066</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Investment adviser on behalf of clients</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <remarks>This statement is filed pursuant to Section 16 of the Act and shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Act or otherwise, the beneficial owners of these securities.</remarks>

    <ownerSignature>
        <signatureName>Paul B. Goucher, Corp. Secretary, on behalf of J. &amp; W. Seligman &amp; Co. Incorporated</signatureName>
        <signatureDate>2008-10-03</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Judith G. Kuhlmann, power of attorney for William C. Morris</signatureName>
        <signatureDate>2008-10-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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