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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;10/17/2006 </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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<div Align="center"><font Face="times New Roman" Size="3" Color="#000000"><b>04-2787865 </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>(IRS Employer</b></font>
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<b>incorporation)</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 (17 CFR 240.14a-12)<BR><BR>


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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))<BR><BR>


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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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Information to be included in the report</b>
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<b>Item 7.01.&nbsp;&nbsp;&nbsp;&nbsp;Regulation FD Disclosure</b></font>
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On October 17, 2006, Pegasystems Inc.  issued a press release announcing  certain preliminary results for the third quarter of 2006 and that it expects to delay the filing of its Quarterly Report on Form 10-Q for the third quarter of 2006 due to a review of its accounting.  A copy of such press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference in its entirety.</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: October 18, 2006</font>
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	By:</font>
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	/s/&nbsp;&nbsp;&nbsp;&nbsp;Shawn Hoyt</font>
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	Shawn Hoyt</font>
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	<div><font Face="times New Roman" Size="2" Color="#000000">General Counsel and Secretary</font>
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<b>Exhibit Index </b></font>
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	<b>Exhibit&nbsp;No.</b></font>
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	<b>Description</b></font>
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	EX-99.1</font>
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	Press Release, dated October 17, 2006, issued by Pegasystems Inc. </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):  10/17/2006
Pegasystems Inc.
(Exact name of registrant as specified in its charter)
Commission File Number:  1-11859
Massachusetts
04-2787865
(State or other jurisdiction of
(IRS Employer
incorporation)
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 (17 CFR 240.14a-12)
[  ]  
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[  ]  
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Information to be included in the report
Item 7.01.    Regulation FD Disclosure
On October 17, 2006, Pegasystems Inc.  issued a press release announcing  certain preliminary results for the third quarter of 2006 and that it expects to delay the filing of its Quarterly Report on Form 10-Q for the third quarter of 2006 due to a review of its accounting.  A copy of such press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference in its entirety.
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: October 18, 2006
By:
/s/    Shawn Hoyt
Shawn Hoyt
General Counsel and Secretary
Exhibit Index
Exhibit No.
Description
EX-99.1
Press Release, dated October 17, 2006, issued by Pegasystems Inc.