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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,
 RbozJ3nBe6dkaV3OqLPJHKUjqmO/tV2L69a1JXqDt5WnRJ7xVQGVFnOI8tY0arpR
 9M49UEesczwmZFm0JYgaJg==

<SEC-DOCUMENT>0001181431-06-048512.txt : 20060818
<SEC-HEADER>0001181431-06-048512.hdr.sgml : 20060818
<ACCEPTANCE-DATETIME>20060818105856
ACCESSION NUMBER:		0001181431-06-048512
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060816
FILED AS OF DATE:		20060818
DATE AS OF CHANGE:		20060818

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ANSYS INC
		CENTRAL INDEX KEY:			0001013462
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				043219960
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		275 TECHNOLOGY DRIVE, SOUTHPOINTE
		CITY:			CANONSBURG
		STATE:			PA
		ZIP:			15317
		BUSINESS PHONE:		4127643304

	MAIL ADDRESS:	
		STREET 1:		275 TECHNOLOGY DRIVE, SOUTHPOINTE
		CITY:			CANONSBURG
		STATE:			PA
		ZIP:			15317

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BLUMENTHAL DANIEL H
		CENTRAL INDEX KEY:			0001038736

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20853
		FILM NUMBER:		061042553

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		3124222400

	MAIL ADDRESS:	
		STREET 1:		C/O WILLIS STEIN & PARTNERS
		STREET 2:		227 W MONROE STREET SUITE 4300
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd127809.xml
<DESCRIPTION>STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-08-16</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001013462</issuerCik>
        <issuerName>ANSYS INC</issuerName>
        <issuerTradingSymbol>ANSS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001038736</rptOwnerCik>
            <rptOwnerName>BLUMENTHAL DANIEL H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>275 TECHNOLOGY DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2>SOUTHPOINTE</rptOwnerStreet2>
            <rptOwnerCity>CANONSBURG</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>15317</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-08-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3713587</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The trade was executed in a series of transactions with a price range of $49.50 to $49.70, with a weighted average price of $49.52.</footnote>
        <footnote id="F2">The reporting person is a Managing Partner of Willis Stein &amp; Partners Management II, LLC and Willis Stein &amp; Partners Management III, LLC, each of which may have indirect pecuniary interests in securities held by certain affiliated funds that they indirectly manage.  The affiliated funds currently hold an aggregate of 3,713,587 shares of Common Stock of the issuer.  The reporting person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest he holds therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Lisa M. O'Connor, Attorney-in-Fact</signatureName>
        <signatureDate>2006-08-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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