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<PERIOD>20050107
<FILING-DATE>20050107
<DATE-OF-FILING-DATE-CHANGE>20050107
<REPORTING-OWNER>
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<MAIL-ADDRESS>
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<CITY>CAMBRIDGE
<STATE>MA
<ZIP>02142
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<CONFORMED-NAME>PEGASYSTEMS INC
<CIK>0001013857
<ASSIGNED-SIC>7374
<IRS-NUMBER>042787865
<STATE-OF-INCORPORATION>MA
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<STATE>MA
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<STATE>MA
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<DOCUMENT>
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<SEQUENCE>1
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>676000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

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

    <ownerSignature>
        <signatureName>Shawn Hoyt, Esq., as Attorney-in-Fact for Alexander V. d'Arbeloff</signatureName>
        <signatureDate>2005-01-07</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
