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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001222572-04-000021.txt : 20040629
<SEC-HEADER>0001222572-04-000021.hdr.sgml : 20040629
<ACCEPTANCE-DATETIME>20040629183820
ACCESSION NUMBER:		0001222572-04-000021
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040629
FILED AS OF DATE:		20040629

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DARBELOFF ALEXANDER V
		CENTRAL INDEX KEY:			0001222572

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11859
		FILM NUMBER:		04889684

	MAIL ADDRESS:	
		STREET 1:		C/O PEGASYSTEMS INC
		STREET 2:		101 MAIN STREET
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PEGASYSTEMS INC
		CENTRAL INDEX KEY:			0001013857
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMPUTER PROCESSING & DATA PREPARATION [7374]
		IRS NUMBER:				042787865
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		101 MAIN ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142-1590
		BUSINESS PHONE:		6173749600

	MAIL ADDRESS:	
		STREET 1:		101 MAIN ST
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142-1590
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
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    </nonDerivativeTable>

    <remarks>4,500 shares of common stock have been sold pursuant to the Rule 10b5-1 Sales Plan under the Securities and Exchange Act of 1934.</remarks>

    <ownerSignature>
        <signatureName>June M. Morris, Esq, as Attorney-in-Fact for Alexander V. d'Arbeloff</signatureName>
        <signatureDate>2004-06-29</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----