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<title>Prepared By R.R. Donnelley Financial -- Form 8-K</title>
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<b>UNITED STATES </b></font></div>

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<b>SECURITIES AND EXCHANGE COMMISSION </b></font></div>

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<b>Washington D.C., 20549 </b></font></div>

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<b>Form 8-K </b></font></div> <div><font Size="1">&nbsp;</font></div>

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<b>Current Report </b></font></div>

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<b>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 </b></font></div>

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<b>Date Of Report (Date Of Earliest Event Reported):&nbsp;&nbsp;09/02/2005 </b></font></div>




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<b>Pegasystems Inc. </b></font></div>

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<b>(Exact Name of Registrant as Specified in its Charter)</b></font></div>

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<b>Commission File Number:&nbsp;&nbsp;1-11859 </b></font></div>

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<div Align="center"><font Face="times New Roman" Size="3" Color="#000000"><b>Massachusetts </b></font>
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<b>(State or Other Jurisdiction of</b></font>
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<div Align="center"><font Face="times New Roman" Size="2" Color="#000000"><b>(I.R.S. Employer</b></font>
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<b>Incorporation or Organization)</b></font>
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<b>Identification No.)</b></font>
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<b>101 Main Street, Cambridge, Massachusetts 02142 </b></font></div>


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<b>(Address of Principal Executive Offices, Including Zip Code)</b></font>
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<b>617-374-9600  </b></font>
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<b>(Registrant&#146;s Telephone Number, Including Area Code) </b></font>
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<b>Not Applicable </div><div Align="center"> </b></font>
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<b>(Former name or former address, if changed since last report) </b></font>
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<b>Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:<BR><BR>
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<b>[&nbsp;&nbsp;]&nbsp;&nbsp;
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)<BR><BR>

[&nbsp;&nbsp;]&nbsp;&nbsp;
Soliciting material pursuant to Rule 14a-12 under the Exchange Act(17CFR240.14a-12)<BR><BR>


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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act(17CFR240.14d-2(b))<BR><BR>


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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act(17CFR240.13e-4(c))
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Items to be Included in this Report</b>
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<b>Item 7.01.&nbsp;&nbsp;&nbsp;&nbsp;Regulation FD Disclosure</b></font>
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On September 2, 2005, Pegasystems Inc. established a pre-arranged stock repurchase plan (the "10b5-1 Plan"), intended to comply with the requirements of Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and of Rule 10b-18 under the Exchange Act.  The 10b5-1 Plan commences on October 1, 2005 and expires on October 31, 2005, subject to conditions specified in the plan agreement.&nbsp;&nbsp;&nbsp;<p>The Company established this 10b5-1 Plan in connection with the stock repurchase program that was announced by the Company in press releases dated October 28, 2004 and August 18, 2005.  Any actual repurchases under the 10b5-1 Plan will be disclosed in the Company's Annual Report on Form 10-K for the fourth quarter and year ended December 31, 2005.</font>
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<b>Signature(s) </b></font>
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Pursuant to the Requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the Undersigned hereunto
duly authorized. </font>
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	Pegasystems Inc.</font>
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	Date: September 06, 2005.</font>
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	By:</font>
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	/s/&nbsp;&nbsp;&nbsp;&nbsp;Shawn S. Hoyt</font>
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	Shawn S. Hoyt</font>
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	<div><font Face="times New Roman" Size="2" Color="#000000">Secretary and General Counsel</font>
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Prepared By R.R. Donnelley Financial -- Form 8-K
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C., 20549
Form 8-K
Current Report
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date Of Report (Date Of Earliest Event Reported):  09/02/2005
Pegasystems Inc.
(Exact Name of Registrant as Specified in its Charter)
Commission File Number:  1-11859
Massachusetts
04-2787865
(State or Other Jurisdiction of
(I.R.S. Employer
Incorporation or Organization)
Identification No.)
101 Main Street, Cambridge, Massachusetts 02142
(Address of Principal Executive Offices, Including Zip Code)
617-374-9600
(Registrant's Telephone Number, Including Area Code)
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
[  ]  
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[  ]  
Soliciting material pursuant to Rule 14a-12 under the Exchange Act(17CFR240.14a-12)
[  ]  
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act(17CFR240.14d-2(b))
[  ]  
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act(17CFR240.13e-4(c))
Items to be Included in this Report
Item 7.01.    Regulation FD Disclosure
On September 2, 2005, Pegasystems Inc. established a pre-arranged stock repurchase plan (the "10b5-1 Plan"), intended to comply with the requirements of Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and of Rule 10b-18 under the Exchange Act.  The 10b5-1 Plan commences on October 1, 2005 and expires on October 31, 2005, subject to conditions specified in the plan agreement.
The Company established this 10b5-1 Plan in connection with the stock repurchase program that was announced by the Company in press releases dated October 28, 2004 and August 18, 2005.  Any actual repurchases under the 10b5-1 Plan will be disclosed in the Company's Annual Report on Form 10-K for the fourth quarter and year ended December 31, 2005.
Signature(s)
Pursuant to the Requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the Undersigned hereunto
duly authorized.
Pegasystems Inc.
Date: September 06, 2005.
By:
/s/    Shawn S. Hoyt
Shawn S. Hoyt
Secretary and General Counsel