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<p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">As filed with the Securities and Exchange Commission
on September&nbsp;19, 2005</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font></p>

<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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<p align="center" style="border:none;margin:0in 0in .0001pt;padding:0in;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

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<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">SECURITIES AND EXCHANGE COMMISSION</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Washington,
D.C.&#160; 20549</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">FORM&nbsp;S-8</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;">REGISTRATION STATEMENT UNDER<br>
THE SECURITIES ACT OF 1933</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;">Aspen Technology,&nbsp;Inc.</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">(Exact Name of Registrant as
Specified in Its Charter)</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-2739697</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or Other Jurisdiction of Incorporation<br>
  or Organization)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer<br>
  Identification No.)</font></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Ten Canal Park, Cambridge, Massachusetts</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">02141</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of Principal
  Executive Offices)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" valign="top" style="padding:0in 0in 0in 0in;width:49.0%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Zip Code)</font></p>
  </td>
 </tr>
</table>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">2005
Stock Incentive Plan</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">(Full Title of the Plan)</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Frederic
G. Hammond</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Senior
Vice President and General Counsel</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Aspen
Technology,&nbsp;Inc.</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Ten
Canal Park</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">Cambridge,
Massachusetts 02141</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">(Name and Address of Agent For Service)</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">(617)&nbsp;949-1000</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">(Telephone Number, Including Area
Code, of Agent For Service)</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">CALCULATION
OF REGISTRATION FEE</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="22%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:22.5%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Title of Each Class&nbsp;of<br>
  Securities to be Registered</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.52%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="17%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:17.14%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount to be<br>
  Registered(1)</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.52%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:16.36%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed Maximum<br>
  Offering Price Per<br>
  Share</font></b></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.42%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="15%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:15.18%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed Maximum<br>
  Aggregate Offering<br>
  Price</font></b></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.46%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:14.92%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount of<br>
  Registration Fee</font></b></p>
  </td>
  <td width="0%" valign="bottom" style="padding:0in 0in 0in 0in;width:.98%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="22%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:22.5%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Common Stock,
  $0.10 par value per share (including the associated Preferred Stock Purchase
  Rights)</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="17%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:17.14%;">
  <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4,000,000 shares</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.52%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="16%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:16.36%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$5.04(2)</font></p>
  </td>
  <td width="4%" valign="bottom" style="padding:0in 0in 0in 0in;width:4.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="15%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:15.18%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$20,160,000(2)</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.46%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="14%" valign="bottom" style="border:none;padding:0in 0in 0in 0in;width:14.92%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$2,373</font></p>
  </td>
  <td width="0%" valign="bottom" style="padding:0in 0in 0in 0in;width:.98%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="1" width="25%" noshade color="black" align="left">

</font></div>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>In
accordance with Rule&nbsp;416 under the Securities Act of 1933, as amended,
this registration statement shall be deemed to cover any additional securities
that may from time to time be offered or issued to prevent dilution resulting
from stock splits, stock dividends or similar transactions.</p>

<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Estimated
solely for the purpose of calculating the registration fee pursuant to Rules&nbsp;457(c)&nbsp;and
457(h)&nbsp;of the Securities Act of 1933, as amended, and based upon the
average of the high and low prices of the registrant&#146;s common stock as reported
on the Nasdaq National Market on September&nbsp;13, 2005.</p>

<div style="border:none;border-bottom:double windowtext 9.0pt;padding:0in 0in 0in 0in;">

<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART&nbsp;I<br>
INFORMATION REQUIRED IN THE SECTION&nbsp;10(a)&nbsp;PROSPECTUS</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1.</font></b><b><font style="font-weight:bold;"> Plan Information.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information required by Item 1 is included in documents sent or
given to participants in the plans covered by this registration statement
pursuant to Rule&nbsp;428(b)(1)&nbsp;of the Securities Act of 1933, as amended
(the &#147;Securities Act&#148;).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2.</font></b><b><font style="font-weight:bold;"> Registrant
Information and Employee Plan Annual Information.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The written statement required by Item 2 is included in documents sent
or given to participants in the plans covered by this registration statement
pursuant to Rule&nbsp;428(b)(1)&nbsp;of the Securities Act.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART&nbsp;II<br>
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</font></b></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 3.</font></b><b><font style="font-weight:bold;"> Incorporation
of Documents by Reference.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The registrant is subject to the informational and reporting
requirements of Sections 13(a), 14, and 15(d)&nbsp;of the Securities Exchange
Act of 1934, as amended (the &#147;Exchange Act&#148;), and in accordance therewith files
reports, proxy statements and other information with the Securities and
Exchange Commission (the &#147;Commission&#148;). The following documents, which are on
file with the Commission, are incorporated in this registration statement by
reference:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The
registrant&#146;s latest annual report filed pursuant to Section&nbsp;13(a)&nbsp;or
15(d)&nbsp;of the Exchange Act or the latest prospectus filed pursuant to Rule&nbsp;424(b)&nbsp;under
the Securities Act that contains audited financial statements for the
registrant&#146;s latest fiscal year for which such statements have been filed.</p>

<p style="margin:0in 0in .0001pt 45.0pt;text-indent:-45.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>All
other reports filed pursuant to Section&nbsp;13(a)&nbsp;or 15(d)&nbsp;of the
Exchange Act since the end of the fiscal year covered by the document referred
to in (a)&nbsp;above.</p>

<p style="margin:0in 0in .0001pt 43.5pt;text-indent:-21.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>The
description of the securities contained in the registrant&#146;s registration
statements on Form&nbsp;8-A filed under the Exchange Act, including any
amendment or report filed for the purpose of updating such description.</p>

<p style="margin:0in 0in .0001pt 45.0pt;text-indent:-45.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All documents subsequently filed by the registrant pursuant to Sections
13(a), 13(c), 14 and 15(d)&nbsp;of the Exchange Act, prior to the filing of a post-effective
amendment which indicates that all securities offered hereby have been sold or
which deregisters all securities then remaining unsold, shall be deemed to be
incorporated by reference in this registration statement and to be part hereof
from the date of the filing of such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for the purposes of this registration
statement to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this registration statement.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 4.</font></b><b><font style="font-weight:bold;"> Description
of Securities.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1</font></p>

<div><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 5.</font></b><b><font style="font-weight:bold;"> Interests
of Named Experts and Counsel.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wilmer Cutler Pickering Hale and Dorr LLP has
opined as to the legality of the securities being offered by this registration
statement.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 6.</font></b><b><font style="font-weight:bold;"> Indemnification
of Directors and Officers.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Section&nbsp;102 of the Delaware General Corporation Law allows a
corporation to eliminate the personal liability of directors of a corporation
to the corporation or its stockholders for monetary damages for a breach of
fiduciary duty as a director, except where the director breached his duty of
loyalty, failed to act in good faith, engaged in intentional misconduct or
knowingly violated a law, authorized the payment of a dividend or approved a
stock repurchase in violation of Delaware corporate law or obtained an improper
personal benefit. The registrant has included such a provision in its
Certificate of Incorporation, as amended (the &#147;Certificate of Incorporation&#148;).</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Section&nbsp;145 of the General Corporation Law of Delaware provides
that a corporation has the power to indemnify a director, officer, employee or
agent of the corporation and certain other persons serving at the request of
the corporation in related capacities against amounts paid and expenses
incurred in connection with an action or proceeding to which he is or is
threatened to be made a party by reason of such position, if such person shall
have acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation, and, in any criminal
proceeding, if such person had no reasonable cause to believe his conduct was
unlawful; provided that, in the case of actions brought by or in the right of
the corporation, no indemnification shall be made with respect to any matter as
to which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that the adjudicating court determines that such
indemnification is proper under the circumstances.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Article&nbsp;SEVENTH of the registrant&#146;s Certificate of Incorporation
provides that no director of the registrant shall be personally liable for any
monetary damages for any breach of fiduciary duty as a director, except to the
extent that the Delaware General Corporation Law prohibits the elimination or
limitation of liability of directors for breach of fiduciary duty.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Article&nbsp;EIGHTH of the Certificate of Incorporation provides that a
director or officer of the registrant shall be indemnified by the registrant
against:</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>all expenses (including attorneys&#146; fees), judgments, fines and amounts
paid in settlement incurred in connection with any litigation or other legal
proceeding (other than an action by or in the right of the registrant) brought
against him or her by virtue of his or her position as a director or officer of
the registrant if he or she acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the
registrant, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his or her conduct was unlawful; and</p>

<p style="margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>all expenses (including attorneys&#146; fees) and amounts paid in the
settlement incurred in connection with any action by or in the right of the
registrant brought against him or her by virtue of his or her position as a
director or officer of the registrant if he or she acted in good faith and in a
manner he or she reasonably believed to be in, or not opposed to, the best
interests of the registrant, except that no indemnification shall be made with
respect to any matter as to which such person shall have been adjudged to be
liable to the registrant, unless a court determines that, despite such
adjudication but in view of all of the circumstances, he or she is entitled to
indemnification of such expenses.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Notwithstanding the foregoing, to the extent that a director or officer
has been successful, on the merits or otherwise, including the dismissal of an
action without prejudice, he or she is required to be indemnified by the
registrant against all expenses (including attorneys&#146; fees) incurred in
connection therewith. Expenses shall be advanced to a director or officer at
his or her request, provided that he or she undertakes
to repay the amount advanced if it is ultimately determined that he or she is
not entitled to indemnification for such expenses.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Indemnification is required to be made unless the registrant determines
that the applicable standard of conduct required for indemnification has not
been met. In the event of a determination by the registrant that the director
or officer did not meet the applicable standard of conduct required for
indemnification, or if the registrant fails to make an indemnification payment
within sixty days after such payment is claimed by such person, such person is
permitted to petition the court to make an independent determination as to
whether such person is entitled to indemnification. As a condition precedent to
the right of indemnification, the director or officer must give the registrant
notice of the action for which indemnity is sought and the registrant has the
right to participate in such action or assume the defense thereof.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Article&nbsp;EIGHTH of the Certificate of Incorporation further
provides that the indemnification provided therein is not exclusive, and
provides that in the event that the Delaware General Corporation Law is amended
to expand the indemnification permitted to directors or officers the registrant
must indemnify those persons to fullest extent permitted by such law as so
amended.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The registrant has purchased directors&#146; and
officers&#146; liability insurance which would indemnify its directors and officers
against damages arising out of certain kinds of claims which might be made
against them based on their negligent acts or omissions while acting in their
capacity as such.</font></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 7.</font></b><b><font style="font-weight:bold;"> Exemption from Registration Claimed.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 8.</font></b><b><font style="font-weight:bold;">&#160; Exhibits.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="6%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Number</font></b></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="86%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:86.66%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1 (1)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Certificate of
  Incorporation of Aspen Technology,&nbsp;Inc., as amended</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2 (2)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By-Laws of Aspen
  Technology,&nbsp;Inc.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.3 (3)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Specimen Certificate
  for Shares of Aspen Technology,&nbsp;Inc.&#146;s common stock, $.10 par value.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.4 (2)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rights Agreement
  dated as of March&nbsp;12, 1998 between Aspen Technology,&nbsp;Inc. and
  American Stock Transfer and Trust Company, as Rights Agent, including related
  forms of the following: (a)&nbsp;Certificate of Designation of Series&nbsp;A
  Participating Cumulative Preferred Stock of Aspen Technology,&nbsp;Inc. and (b)&nbsp;Right
  Certificate</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.5 (4)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;1
  dated as of October&nbsp;26, 2001 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.6 (5)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;2
  dated as of February&nbsp;6, 2002 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.7 (6)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;3
  dated as of March&nbsp;19, 2002 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.8 (7)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;4
  dated as of May&nbsp;9, 2002 to Rights Agreement dated as of March&nbsp;17,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.9 (8)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;5
  dated as of June&nbsp;1, 2003 to Rights Agreement dated as of March&nbsp;17,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.10 (9)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of
  Warrant of Aspen Technology,&nbsp;Inc. dated as of May&nbsp;9, 2002.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.11 (1)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of WD
  Common Stock Purchase Warrant of Aspen Technology,&nbsp;Inc. dated as of August&nbsp;14,
  2003.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.12(1)</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of WB
  Common Stock Purchase Warrant of Aspen Technology,&nbsp;Inc. dated as of August&nbsp;14,
  2003.</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion of
  Wilmer Cutler Pickering Hale and Dorr LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of
  Wilmer Cutler Pickering Hale and Dorr LLP (included in Exhibit&nbsp;5)</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of
  Deloitte&nbsp;&amp; Touche LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="6%" valign="top" style="padding:0in 0in 0in 0in;width:6.24%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24</font></p>
  </td>
  <td width="7%" valign="bottom" style="padding:0in 0in 0in 0in;width:7.1%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power of
  attorney (included on the signature pages&nbsp;of this registration
  statement)</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt 27.0pt;text-indent:-27.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="1" width="25%" noshade color="black" align="left">

</font></div>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated August&nbsp;21, 2003 (filed on August&nbsp;22, 2003), and incorporated
herein by reference.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated March&nbsp;12, 1998 (filed on March&nbsp;27, 1998), and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;1 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. (filed on June&nbsp;12, 1998), and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;2 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on November&nbsp;8, 2001, and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(5)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;3 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on February&nbsp;12, 2002, and
incorporated herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(6)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;4 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on March&nbsp;20, 2002, and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(7)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;5 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on May&nbsp;31, 2002, and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(8)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;6 to Form&nbsp;8-A of Aspen
Technology,&nbsp;Inc. filed on June&nbsp;2, 2003, and incorporated herein by
reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(9)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated June&nbsp;5, 2002 (filed on June&nbsp;7, 2002), and incorporated herein
by reference.</p>

<p style="margin:0in 0in .0001pt 27.0pt;text-indent:-27.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.</font></b><b><font style="font-weight:bold;"> Undertakings.</font></b></p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Item 512(a)&nbsp;of
Regulation&nbsp;S-K.</font></i>&nbsp;&nbsp;The
undersigned registrant hereby undertakes:</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .75in;text-indent:.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:</p>

<p style="margin:0in 0in .0001pt .5in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(i)&nbsp;To include any prospectus required by Section&nbsp;10(a)(3)&nbsp;of the Securities Act;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(ii)&nbsp;To reflect in the prospectus any facts or
events arising after the effective date of the registration statement (or the
most recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
registration statement; and</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(iii)&nbsp;To include any material information with
respect to the plan of distribution not previously disclosed in the
registration statement or any material change to such information in the
registration statement;</font></p>

<p style="margin:0in 0in .0001pt 1.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">provided</font></i>, <i><font style="font-style:italic;">however</font></i>, that
paragraphs (i)&nbsp;and (ii)&nbsp;do not apply if the information required to
be included in a post-effective amendment by those paragraphs is contained in
periodic reports filed with or furnished to the Commission by the registrant
pursuant to Section&nbsp;13 or Section&nbsp;15(d)&nbsp;of the Exchange Act that
are incorporated by reference in the registration statement.</p>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>That,
for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration
statement relating to</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">the</font> securities offered therein, and the offering of such securities at
that time shall be deemed to be the initial <i><font style="font-style:italic;">bona
fide</font></i> offering thereof.</p>

<p style="margin:0in 0in .0001pt 79.5pt;text-indent:-21.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt 1.25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>To
remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.</p>

<p style="margin:0in 0in .0001pt 81.0pt;text-indent:-45.0pt;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Item 512(b)&nbsp;of
Regulation&nbsp;S-K.</font></i>&nbsp;&nbsp;&nbsp;&nbsp;The
undersigned registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the registrant&#146;s annual
report pursuant to Section&nbsp;13(a)&nbsp;or Section&nbsp;15(d)&nbsp;of the
Exchange Act that is incorporated by reference in the registration statement
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial <i><font style="font-style:italic;">bona fide</font></i>
offering thereof.</p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3.</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><i><font style="font-style:italic;">Item 512(h)&nbsp;of
Regulation&nbsp;S-K.</font></i>&nbsp;&nbsp;&nbsp;&nbsp;Insofar
as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the registrant
pursuant to the foregoing provisions, or otherwise, the registrant has been
advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by
such director, officer or controlling person in connection with the securities
being registered, the registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed
by the final adjudication of such issue.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of
1933, the registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form&nbsp;S-8 and has duly
caused this registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Cambridge, Massachusetts as of September&nbsp;13,
2005.</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="53%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:53.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">ASPEN
  TECHNOLOGY, INC.</font></p>
  </td>
 </tr>
 <tr>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="53%" colspan="3" valign="top" style="padding:0in 0in 0in 0in;width:53.7%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.96%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
  </td>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.78%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Mark E. Fusco</font></p>
  </td>
  <td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.98%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.96%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:49.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Mark
  E. Fusco</font></p>
  </td>
 </tr>
 <tr>
  <td width="46%" valign="top" style="padding:0in 0in 0in 0in;width:46.3%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.96%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="49%" colspan="2" valign="top" style="padding:0in 0in 0in 0in;width:49.74%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President
  and Chief Executive Officer</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt 243.0pt;text-indent:-4.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt 243.0pt;text-indent:-4.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">POWER
OF ATTORNEY AND SIGNATURES</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">We, the undersigned officers and directors of Aspen
Technology,&nbsp;Inc., hereby severally constitute and appoint Mark E. Fusco,
Charles F. Kane, and Frederic G. Hammond, and each of them singly, our true and
lawful attorneys with full power to them, and each of them singly, to sign for
us and in our names in the capacities indicated below, the registration
statement on Form&nbsp;S-8 filed herewith and any and all subsequent amendments
to said registration statement, and generally to do all such things in our
names and on our behalf in our capacities as officers and directors to enable
Aspen Technology,&nbsp;Inc. to comply with the provisions of the Securities Act
of 1933, as amended, and all requirements of the Securities and Exchange
Commission, hereby ratifying and confirming our signatures as they may be
signed by our said attorneys, or any of them, to said registration statement
and any and all amendments thereto.</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of
1933, this registration statement has been signed by the following persons in
the capacities indicated as of September&nbsp;13, 2005.</font></p>

<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Signature</font></b></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="59%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:59.34%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Title</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Mark E. Fusco</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">President, Chief
  Executive Officer and Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Mark E. Fusco</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">(principal
  executive officer)</font></i></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">&nbsp;</font></i></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Charles F. Kane</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Senior Vice
  President - Finance and</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Charles F. Kane</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Financial
  Officer<br>
  <i><font style="font-style:italic;">(principal financial and accounting
  officer)</font></i></font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Donald P. Casey</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Donald P. Casey</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Gary E. Haroian</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Gary E. Haroian</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.62%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.34%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">7</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Stephen M. Jennings</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Stephen M.
  Jennings</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Douglas A. Kingsley</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Douglas A.
  Kingsley</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Joan C. McArdle</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Joan C. McArdle</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt 30.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Michael Pehl</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>
  </td>
 </tr>
 <tr>
  <td width="37%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:37.04%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Michael Pehl</font></p>
  </td>
  <td width="3%" valign="bottom" style="padding:0in 0in 0in 0in;width:3.54%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="59%" valign="top" style="padding:0in 0in 0in 0in;width:59.42%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
 </tr>
</table>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;">INDEX
TO EXHIBITS</font></b></p>

<p style="font-weight:bold;margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:normal;">&nbsp;</font></b></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="7%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Number</font></b></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="87%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:87.66%;">
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.1 (1)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Certificate of
  Incorporation of Aspen Technology,&nbsp;Inc., as amended</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.2 (2)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By-Laws of Aspen
  Technology,&nbsp;Inc.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.3 (3)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Specimen
  Certificate for Shares of Aspen Technology,&nbsp;Inc.&#146;s common stock, $.10
  par value.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.4 (2)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Rights Agreement
  dated as of March&nbsp;12, 1998 between Aspen Technology,&nbsp;Inc. and
  American Stock Transfer and Trust Company, as Rights Agent, including related
  forms of the following: (a)&nbsp;Certificate of Designation of Series&nbsp;A
  Participating Cumulative Preferred Stock of Aspen Technology,&nbsp;Inc. and (b)&nbsp;Right
  Certificate</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.5 (4)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;1
  dated as of October&nbsp;26, 2001 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.6 (5)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;2
  dated as of February&nbsp;6, 2002 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.7 (6)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;3
  dated as of March&nbsp;19, 2002 to Rights Agreement dated as of March&nbsp;12,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.8 (7)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;4
  dated as of May&nbsp;9, 2002 to Rights Agreement dated as of March&nbsp;17,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.9 (8)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Amendment No.&nbsp;5
  dated as of June&nbsp;1, 2003 to Rights Agreement dated as of March&nbsp;17,
  1998 between Aspen Technology,&nbsp;Inc. and American Stock Transfer&nbsp;&amp;
  Trust Company, as Rights Agent.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.10 (9)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of
  Warrant of Aspen Technology,&nbsp;Inc. dated as of May&nbsp;9, 2002.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.11 (1)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of WD
  Common Stock Purchase Warrant of Aspen Technology,&nbsp;Inc. dated as of August&nbsp;14,
  2003.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4.12 (1)</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Form&nbsp;of WB
  Common Stock Purchase Warrant of Aspen Technology,&nbsp;Inc. dated as of August&nbsp;14,
  2003.</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion of
  Wilmer Cutler Pickering Hale and Dorr LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of
  Wilmer Cutler Pickering Hale and Dorr LLP (included in Exhibit&nbsp;5)</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent of
  Deloitte&nbsp;&amp; Touche LLP</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  </td>
 </tr>
 <tr>
  <td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.14%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24</font></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in 0in 0in 0in;width:5.2%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="87%" valign="top" style="padding:0in 0in 0in 0in;width:87.66%;">
  <p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power of
  attorney (included on the signature pages&nbsp;of this registration
  statement)</font></p>
  </td>
 </tr>
</table>

<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="margin:0in 0in .0001pt 27.0pt;text-indent:-27.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="1" width="25%" noshade color="black" align="left">

</font></div>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated August&nbsp;21, 2003 (filed on August&nbsp;22, 2003), and incorporated
herein by reference.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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<br clear="all" style="page-break-before:always;">


<div style="font-family:Times New Roman;">

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated March&nbsp;12, 1998 (filed on March&nbsp;27, 1998), and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;1 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. (filed on June&nbsp;12, 1998), and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;2 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on November&nbsp;8, 2001, and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(5)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;3 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on February&nbsp;12, 2002, and
incorporated herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(6)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;4 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on March&nbsp;20, 2002, and incorporated herein
by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(7)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;5 to the Registration Statement on Form&nbsp;8-A
of Aspen Technology,&nbsp;Inc. filed on May&nbsp;31, 2002, and incorporated
herein by reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(8)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to Amendment No.&nbsp;6 to Form&nbsp;8-A of Aspen
Technology,&nbsp;Inc. filed on June&nbsp;2, 2003, and incorporated herein by
reference.</p>

<p style="margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="font-size:10.0pt;margin:0in 0in .0001pt .35in;text-indent:-.35in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(9)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Previously
filed as an exhibit to the Current Report on Form&nbsp;8-K of Aspen Technology,&nbsp;Inc.
dated June&nbsp;5, 2002 (filed on June&nbsp;7, 2002), and incorporated herein
by reference.</p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10</font></p>

<div style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">

<hr size="2" width="100%" noshade color="gray" align="left">

</font></div>

</div>
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{"company-data": {"conformed-name": "ASPEN TECHNOLOGY INC /DE/", "cik": "0000929940", "assigned-sic": "7371", "irs-number": "042739697", "state-of-incorporation": "DE", "fiscal-year-end": "0630"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-128423", "film-number": "051092059"}, "business-address": {"street1": "TEN CANAL PARK", "city": "CAMBRIDGE", "state": "MA", "zip": "02141", "phone": "6179491000"}, "mail-address": {"street1": "TEN CANAL PARK", "city": "CAMBRIDGE", "state": "MA", "zip": "02141"}}
As filed with the Securities and Exchange Commission
on September 19, 2005
Registration No. 333-
SECURITIES AND EXCHANGE COMMISSION
Washington,
D.C.  20549
FORM S-8
REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OF 1933
Aspen Technology, Inc.
(Exact Name of Registrant as
Specified in Its Charter)
Delaware
04-2739697
(State or Other Jurisdiction of Incorporation
or Organization)
(I.R.S. Employer
Identification No.)
Ten Canal Park, Cambridge, Massachusetts
02141
(Address of Principal
  Executive Offices)
(Zip Code)
2005
Stock Incentive Plan
(Full Title of the Plan)
Frederic
G. Hammond
Senior
Vice President and General Counsel
Aspen
Technology, Inc.
Ten
Canal Park
Cambridge,
Massachusetts 02141
(Name and Address of Agent For Service)
(617) 949-1000
(Telephone Number, Including Area
Code, of Agent For Service)
CALCULATION
OF REGISTRATION FEE
Title of Each Class of
Securities to be Registered
Amount to be
Registered(1)
Proposed Maximum
Offering Price Per
Share
Proposed Maximum
Aggregate Offering
Price
Amount of
Registration Fee
Common Stock,
  $0.10 par value per share (including the associated Preferred Stock Purchase
  Rights)
4,000,000 shares
$5.04(2)
$20,160,000(2)
$2,373
(1)
In
accordance with Rule 416 under the Securities Act of 1933, as amended,
this registration statement shall be deemed to cover any additional securities
that may from time to time be offered or issued to prevent dilution resulting
from stock splits, stock dividends or similar transactions.
(2)
Estimated
solely for the purpose of calculating the registration fee pursuant to Rules 457(c) and
457(h) of the Securities Act of 1933, as amended, and based upon the
average of the high and low prices of the registrant's common stock as reported
on the Nasdaq National Market on September 13, 2005.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item 1.
Plan Information.
The information required by Item 1 is included in documents sent or
given to participants in the plans covered by this registration statement
pursuant to Rule 428(b)(1) of the Securities Act of 1933, as amended
(the "Securities Act").
Item 2.
Registrant
Information and Employee Plan Annual Information.
The written statement required by Item 2 is included in documents sent
or given to participants in the plans covered by this registration statement
pursuant to Rule 428(b)(1) of the Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3.
Incorporation
of Documents by Reference.
The registrant is subject to the informational and reporting
requirements of Sections 13(a), 14, and 15(d) of the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and in accordance therewith files
reports, proxy statements and other information with the Securities and
Exchange Commission (the "Commission"). The following documents, which are on
file with the Commission, are incorporated in this registration statement by
reference:
(a)
The
registrant's latest annual report filed pursuant to Section 13(a) or
15(d) of the Exchange Act or the latest prospectus filed pursuant to Rule 424(b) under
the Securities Act that contains audited financial statements for the
registrant's latest fiscal year for which such statements have been filed.
(b)
All
other reports filed pursuant to Section 13(a) or 15(d) of the
Exchange Act since the end of the fiscal year covered by the document referred
to in (a) above.
(c)
The
description of the securities contained in the registrant's registration
statements on Form 8-A filed under the Exchange Act, including any
amendment or report filed for the purpose of updating such description.
All documents subsequently filed by the registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective
amendment which indicates that all securities offered hereby have been sold or
which deregisters all securities then remaining unsold, shall be deemed to be
incorporated by reference in this registration statement and to be part hereof
from the date of the filing of such documents. Any statement contained in a
document incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or superseded for the purposes of this registration
statement to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of this registration statement.
Item 4.
Description
of Securities.
Not applicable.
1
Item 5.
Interests
of Named Experts and Counsel.
Wilmer Cutler Pickering Hale and Dorr LLP has
opined as to the legality of the securities being offered by this registration
statement.
Item 6.
Indemnification
of Directors and Officers.
Section 102 of the Delaware General Corporation Law allows a
corporation to eliminate the personal liability of directors of a corporation
to the corporation or its stockholders for monetary damages for a breach of
fiduciary duty as a director, except where the director breached his duty of
loyalty, failed to act in good faith, engaged in intentional misconduct or
knowingly violated a law, authorized the payment of a dividend or approved a
stock repurchase in violation of Delaware corporate law or obtained an improper
personal benefit. The registrant has included such a provision in its
Certificate of Incorporation, as amended (the "Certificate of Incorporation").
Section 145 of the General Corporation Law of Delaware provides
that a corporation has the power to indemnify a director, officer, employee or
agent of the corporation and certain other persons serving at the request of
the corporation in related capacities against amounts paid and expenses
incurred in connection with an action or proceeding to which he is or is
threatened to be made a party by reason of such position, if such person shall
have acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation, and, in any criminal
proceeding, if such person had no reasonable cause to believe his conduct was
unlawful; provided that, in the case of actions brought by or in the right of
the corporation, no indemnification shall be made with respect to any matter as
to which such person shall have been adjudged to be liable to the corporation
unless and only to the extent that the adjudicating court determines that such
indemnification is proper under the circumstances.
Article SEVENTH of the registrant's Certificate of Incorporation
provides that no director of the registrant shall be personally liable for any
monetary damages for any breach of fiduciary duty as a director, except to the
extent that the Delaware General Corporation Law prohibits the elimination or
limitation of liability of directors for breach of fiduciary duty.
Article EIGHTH of the Certificate of Incorporation provides that a
director or officer of the registrant shall be indemnified by the registrant
against:
(a)
all expenses (including attorneys' fees), judgments, fines and amounts
paid in settlement incurred in connection with any litigation or other legal
proceeding (other than an action by or in the right of the registrant) brought
against him or her by virtue of his or her position as a director or officer of
the registrant if he or she acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the
registrant, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his or her conduct was unlawful; and
(b)
all expenses (including attorneys' fees) and amounts paid in the
settlement incurred in connection with any action by or in the right of the
registrant brought against him or her by virtue of his or her position as a
director or officer of the registrant if he or she acted in good faith and in a
manner he or she reasonably believed to be in, or not opposed to, the best
interests of the registrant, except that no indemnification shall be made with
respect to any matter as to which such person shall have been adjudged to be
liable to the registrant, unless a court determines that, despite such
adjudication but in view of all of the circumstances, he or she is entitled to
indemnification of such expenses.
2
Notwithstanding the foregoing, to the extent that a director or officer
has been successful, on the merits or otherwise, including the dismissal of an
action without prejudice, he or she is required to be indemnified by the
registrant against all expenses (including attorneys' fees) incurred in
connection therewith. Expenses shall be advanced to a director or officer at
his or her request, provided that he or she undertakes
to repay the amount advanced if it is ultimately determined that he or she is
not entitled to indemnification for such expenses.
Indemnification is required to be made unless the registrant determines
that the applicable standard of conduct required for indemnification has not
been met. In the event of a determination by the registrant that the director
or officer did not meet the applicable standard of conduct required for
indemnification, or if the registrant fails to make an indemnification payment
within sixty days after such payment is claimed by such person, such person is
permitted to petition the court to make an independent determination as to
whether such person is entitled to indemnification. As a condition precedent to
the right of indemnification, the director or officer must give the registrant
notice of the action for which indemnity is sought and the registrant has the
right to participate in such action or assume the defense thereof.
Article EIGHTH of the Certificate of Incorporation further
provides that the indemnification provided therein is not exclusive, and
provides that in the event that the Delaware General Corporation Law is amended
to expand the indemnification permitted to directors or officers the registrant
must indemnify those persons to fullest extent permitted by such law as so
amended.
The registrant has purchased directors' and
officers' liability insurance which would indemnify its directors and officers
against damages arising out of certain kinds of claims which might be made
against them based on their negligent acts or omissions while acting in their
capacity as such.
Item 7.
Exemption from Registration Claimed.
Not applicable.
3
Item 8.
Exhibits.
Number
Description
4.1 (1)
Certificate of
  Incorporation of Aspen Technology, Inc., as amended
4.2 (2)
By-Laws of Aspen
  Technology, Inc.
4.3 (3)
Specimen Certificate
  for Shares of Aspen Technology, Inc.'s common stock, $.10 par value.
4.4 (2)
Rights Agreement
  dated as of March 12, 1998 between Aspen Technology, Inc. and
  American Stock Transfer and Trust Company, as Rights Agent, including related
  forms of the following: (a) Certificate of Designation of Series A
  Participating Cumulative Preferred Stock of Aspen Technology, Inc. and (b) Right
  Certificate
4.5 (4)
Amendment No. 1
  dated as of October 26, 2001 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.6 (5)
Amendment No. 2
  dated as of February 6, 2002 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company.
4.7 (6)
Amendment No. 3
  dated as of March 19, 2002 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company.
4.8 (7)
Amendment No. 4
  dated as of May 9, 2002 to Rights Agreement dated as of March 17,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.9 (8)
Amendment No. 5
  dated as of June 1, 2003 to Rights Agreement dated as of March 17,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.10 (9)
Form of
  Warrant of Aspen Technology, Inc. dated as of May 9, 2002.
4.11 (1)
Form of WD
  Common Stock Purchase Warrant of Aspen Technology, Inc. dated as of August 14,
  2003.
4.12(1)
Form of WB
  Common Stock Purchase Warrant of Aspen Technology, Inc. dated as of August 14,
  2003.
5
Opinion of
  Wilmer Cutler Pickering Hale and Dorr LLP
23.1
Consent of
  Wilmer Cutler Pickering Hale and Dorr LLP (included in Exhibit 5)
23.2
Consent of
  Deloitte & Touche LLP
24
Power of
  attorney (included on the signature pages of this registration
  statement)
(1)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated August 21, 2003 (filed on August 22, 2003), and incorporated
herein by reference.
4
(2)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated March 12, 1998 (filed on March 27, 1998), and incorporated
herein by reference.
(3)
Previously
filed as an exhibit to Amendment No. 1 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. (filed on June 12, 1998), and incorporated
herein by reference.
(4)
Previously
filed as an exhibit to Amendment No. 2 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on November 8, 2001, and incorporated
herein by reference.
(5)
Previously
filed as an exhibit to Amendment No. 3 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on February 12, 2002, and
incorporated herein by reference.
(6)
Previously
filed as an exhibit to Amendment No. 4 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on March 20, 2002, and incorporated
herein by reference.
(7)
Previously
filed as an exhibit to Amendment No. 5 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on May 31, 2002, and incorporated
herein by reference.
(8)
Previously
filed as an exhibit to Amendment No. 6 to Form 8-A of Aspen
Technology, Inc. filed on June 2, 2003, and incorporated herein by
reference.
(9)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated June 5, 2002 (filed on June 7, 2002), and incorporated herein
by reference.
Item 9.
Undertakings.
1.
Item 512(a) of
Regulation S-K.
The
undersigned registrant hereby undertakes:
(1)
To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;
(ii) To reflect in the prospectus any facts or
events arising after the effective date of the registration statement (or the
most recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
registration statement; and
(iii) To include any material information with
respect to the plan of distribution not previously disclosed in the
registration statement or any material change to such information in the
registration statement;
provided
,
however
, that
paragraphs (i) and (ii) do not apply if the information required to
be included in a post-effective amendment by those paragraphs is contained in
periodic reports filed with or furnished to the Commission by the registrant
pursuant to Section 13 or Section 15(d) of the Exchange Act that
are incorporated by reference in the registration statement.
(2)
That,
for the purpose of determining any liability under the Securities Act, each
such post-effective amendment shall be deemed to be a new registration
statement relating to
5
the
securities offered therein, and the offering of such securities at
that time shall be deemed to be the initial
bona
fide
offering thereof.
(3)
To
remove from registration by means of a post-effective amendment any of the
securities being registered which remain unsold at the termination of the offering.
2.
Item 512(b) of
Regulation S-K.
The
undersigned registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act, each filing of the registrant's annual
report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act that is incorporated by reference in the registration statement
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial
bona fide
offering thereof.
3.
Item 512(h) of
Regulation S-K.
Insofar
as indemnification for liabilities arising under the Securities Act may be
permitted to directors, officers and controlling persons of the registrant
pursuant to the foregoing provisions, or otherwise, the registrant has been
advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by
such director, officer or controlling person in connection with the securities
being registered, the registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of
appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Securities Act and will be governed
by the final adjudication of such issue.
6
SIGNATURES
Pursuant to the requirements of the Securities Act of
1933, the registrant certifies that it has reasonable grounds to believe that
it meets all of the requirements for filing on Form S-8 and has duly
caused this registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Cambridge, Massachusetts as of September 13,
2005.
ASPEN
  TECHNOLOGY, INC.
By:
/s/ Mark E. Fusco
Mark
  E. Fusco
President
  and Chief Executive Officer
POWER
OF ATTORNEY AND SIGNATURES
We, the undersigned officers and directors of Aspen
Technology, Inc., hereby severally constitute and appoint Mark E. Fusco,
Charles F. Kane, and Frederic G. Hammond, and each of them singly, our true and
lawful attorneys with full power to them, and each of them singly, to sign for
us and in our names in the capacities indicated below, the registration
statement on Form S-8 filed herewith and any and all subsequent amendments
to said registration statement, and generally to do all such things in our
names and on our behalf in our capacities as officers and directors to enable
Aspen Technology, Inc. to comply with the provisions of the Securities Act
of 1933, as amended, and all requirements of the Securities and Exchange
Commission, hereby ratifying and confirming our signatures as they may be
signed by our said attorneys, or any of them, to said registration statement
and any and all amendments thereto.
Pursuant to the requirements of the Securities Act of
1933, this registration statement has been signed by the following persons in
the capacities indicated as of September 13, 2005.
Signature
Title
/s/ Mark E. Fusco
President, Chief
  Executive Officer and Director
Mark E. Fusco
(principal
  executive officer)
/s/ Charles F. Kane
Senior Vice
  President - Finance and
Charles F. Kane
Chief Financial
  Officer
(principal financial and accounting
  officer)
/s/ Donald P. Casey
Director
Donald P. Casey
/s/ Gary E. Haroian
Director
Gary E. Haroian
7
/s/ Stephen M. Jennings
Director
Stephen M.
  Jennings
/s/ Douglas A. Kingsley
Director
Douglas A.
  Kingsley
/s/ Joan C. McArdle
Director
Joan C. McArdle
/s/ Michael Pehl
Director
Michael Pehl
8
INDEX
TO EXHIBITS
Number
Description
4.1 (1)
Certificate of
  Incorporation of Aspen Technology, Inc., as amended
4.2 (2)
By-Laws of Aspen
  Technology, Inc.
4.3 (3)
Specimen
  Certificate for Shares of Aspen Technology, Inc.'s common stock, $.10
  par value.
4.4 (2)
Rights Agreement
  dated as of March 12, 1998 between Aspen Technology, Inc. and
  American Stock Transfer and Trust Company, as Rights Agent, including related
  forms of the following: (a) Certificate of Designation of Series A
  Participating Cumulative Preferred Stock of Aspen Technology, Inc. and (b) Right
  Certificate
4.5 (4)
Amendment No. 1
  dated as of October 26, 2001 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.6 (5)
Amendment No. 2
  dated as of February 6, 2002 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company.
4.7 (6)
Amendment No. 3
  dated as of March 19, 2002 to Rights Agreement dated as of March 12,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company.
4.8 (7)
Amendment No. 4
  dated as of May 9, 2002 to Rights Agreement dated as of March 17,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.9 (8)
Amendment No. 5
  dated as of June 1, 2003 to Rights Agreement dated as of March 17,
  1998 between Aspen Technology, Inc. and American Stock Transfer &
  Trust Company, as Rights Agent.
4.10 (9)
Form of
  Warrant of Aspen Technology, Inc. dated as of May 9, 2002.
4.11 (1)
Form of WD
  Common Stock Purchase Warrant of Aspen Technology, Inc. dated as of August 14,
  2003.
4.12 (1)
Form of WB
  Common Stock Purchase Warrant of Aspen Technology, Inc. dated as of August 14,
  2003.
5
Opinion of
  Wilmer Cutler Pickering Hale and Dorr LLP
23.1
Consent of
  Wilmer Cutler Pickering Hale and Dorr LLP (included in Exhibit 5)
23.2
Consent of
  Deloitte & Touche LLP
24
Power of
  attorney (included on the signature pages of this registration
  statement)
(1)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated August 21, 2003 (filed on August 22, 2003), and incorporated
herein by reference.
9
(2)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated March 12, 1998 (filed on March 27, 1998), and incorporated
herein by reference.
(3)
Previously
filed as an exhibit to Amendment No. 1 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. (filed on June 12, 1998), and incorporated
herein by reference.
(4)
Previously
filed as an exhibit to Amendment No. 2 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on November 8, 2001, and incorporated
herein by reference.
(5)
Previously
filed as an exhibit to Amendment No. 3 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on February 12, 2002, and
incorporated herein by reference.
(6)
Previously
filed as an exhibit to Amendment No. 4 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on March 20, 2002, and incorporated herein
by reference.
(7)
Previously
filed as an exhibit to Amendment No. 5 to the Registration Statement on Form 8-A
of Aspen Technology, Inc. filed on May 31, 2002, and incorporated
herein by reference.
(8)
Previously
filed as an exhibit to Amendment No. 6 to Form 8-A of Aspen
Technology, Inc. filed on June 2, 2003, and incorporated herein by
reference.
(9)
Previously
filed as an exhibit to the Current Report on Form 8-K of Aspen Technology, Inc.
dated June 5, 2002 (filed on June 7, 2002), and incorporated herein
by reference.
10