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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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MIC-Info: RSA-MD5,RSA,
 TrH5NhwhNT6ScAv9uI4I4boWaEuat3Bg/vUS5SJWQltslVWHoCu+3Ga5Bx2b/NEN
 CNz0b6k89pLfo36u4apLoQ==

<SEC-DOCUMENT>9999999995-07-000029.txt : 20070104
<SEC-HEADER>9999999995-07-000029.hdr.sgml : 20070104
<ACCEPTANCE-DATETIME>20070104001516
ACCESSION NUMBER:		9999999995-07-000029
CONFORMED SUBMISSION TYPE:	EFFECT
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20070103
DATE AS OF CHANGE:		20070104
EFFECTIVENESS DATE:		20070103

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ASPEN TECHNOLOGY INC /DE/
		CENTRAL INDEX KEY:			0000929940
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROGRAMMING SERVICES [7371]
		IRS NUMBER:				042739697
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		EFFECT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-109807
		FILM NUMBER:		07506949

	BUSINESS ADDRESS:	
		STREET 1:		TEN CANAL PARK
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02141
		BUSINESS PHONE:		6179491000

	MAIL ADDRESS:	
		STREET 1:		TEN CANAL PARK
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02141
</SEC-HEADER>
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<TYPE>EFFECT
<SEQUENCE>1
<FILENAME>primary_doc.xml
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    <schemaVersion>X0101</schemaVersion>

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    <testOrLive>LIVE</testOrLive>

    <effectiveData>
        <finalEffectivenessDispDate>2007-01-03</finalEffectivenessDispDate>
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            <fileNumber>333-109807</fileNumber>
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