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  <p style="border:none;margin:0in 0in .0001pt;padding:0in;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED
  STATES</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">SECURITIES
  AND EXCHANGE COMMISSION</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington,
  D.C. 20549</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><hr size="1" width="25%" noshade color="black" align="center"></div>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">PURSUANT TO SECTION&nbsp;13 OR 15(d)&nbsp;OF THE</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">SECURITIES EXCHANGE ACT OF 1934</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of report
  (Date of earliest event reported)<b> May&nbsp;7,
  2008 (May&nbsp;7, 2008)</b></font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">Momenta
  Pharmaceuticals,&nbsp;Inc.</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact Name of
  Registrant as Specified in Charter)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware<br>
    </font></b><font size="2" style="font-size:10.0pt;">&nbsp;(State or Other Jurisdiction<br> &nbsp;of Incorporation)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">000-50797<br>
    </font></b><font size="2" style="font-size:10.0pt;">&nbsp;(Commission File Number)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-3561634<br>
    </font></b><font size="2" style="font-size:10.0pt;">(IRS Employer</font></p>
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;Identification No.)</font></p>
    </td>
   </tr>
  </table>
  
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  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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   <tr>
    <td width="49%" valign="top" style="padding:0in .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">675
    West Kendall Street, Cambridge, MA<br>
    </font></b><font size="2" style="font-size:10.0pt;">&nbsp;(Address of Principal Executive Offices)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><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 .7pt 0in .7pt;width:49.0%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">02142<br>
    </font></b><font size="2" style="font-size:10.0pt;">(Zip Code)</font></p>
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  <p style="margin:0in 0in .0001pt;text-autospace:none;"><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;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(617)
  491-9700</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&#160;(Registrant&#146;s telephone number, including area
  code)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Former Name or
  Former Address, if Changed Since Last Report)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box
  below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the
  filing obligation of the registrant under any of the following provisions (<i>see</i> General Instruction A.2. below):</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  Written communications pursuant to Rule&nbsp;425 under the Securities Act (17
  CFR 230.425)</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR
  240.14a-12)</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the
  Exchange Act (17 CFR 240.14d-2(b))</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the
  Exchange Act (17 CFR 240.13e-4(c))</font></p>
  
  <div style="border:none;border-bottom:double windowtext 6.0pt;padding:0in 0in 0in 0in;">
  
  <p style="border:none;margin:0in 0in .0001pt;padding:0in;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <div style="margin:0in 0in .0001pt;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\bekue\08-13613-1\task2918053\13613-1-ba.htm',USER='bekuehe',CD='May  6 11:31 2008' -->
  
  
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  <div style="font-family:Times New Roman;">
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item
  2.02.&nbsp; Results of Operations and Financial Condition</font></b></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:22.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On May&nbsp;7, 2008,
  Momenta Pharmaceuticals,&nbsp;Inc., a Delaware corporation, announced its
  financial results for the quarter ended March&nbsp;31, 2008.&nbsp; The full
  text of the press release issued in connection with the announcement is
  furnished as Exhibit&nbsp;99.1 to this Current Report on Form&nbsp;8-K.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:22.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:22.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information in this Form&nbsp;8-K
  (including Exhibit&nbsp;99.1) shall not be deemed &#147;filed&#148; for purposes of Section&nbsp;18
  of the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), or
  otherwise subject to the liabilities of that section, nor shall it be deemed
  incorporated by reference in any filing under the Securities Act of 1933, as
  amended, or the Exchange Act, except as expressly set forth by specific
  reference in such a filing.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:22.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item
  9.01.&nbsp; Financial Statements and Exhibits</font></b></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt 60.9pt;text-autospace:none;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Exhibits</font></p>
  
  <p style="margin:0in 0in .0001pt 60.9pt;text-autospace:none;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:44.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The following exhibit
  relating to Item 2.02 shall be deemed to be furnished, and not filed:</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:44.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt 44.0pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1.&nbsp; Press Release
  issued by Momenta Pharmaceuticals,&nbsp;Inc. on May&nbsp;7, 2008.</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><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;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2</font></p>
  
  <div style="margin:0in 0in .0001pt;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='2',FILE='C:\JMS\bekue\08-13613-1\task2918053\13613-1-ba.htm',USER='bekuehe',CD='May  6 11:31 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><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;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;text-indent:22.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the
  requirements of the Securities Exchange Act of 1934, the registrant has duly
  caused this report to be signed on its behalf by the undersigned, hereunto duly
  authorized.</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><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 height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="365" colspan="2" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:3.8in;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">MOMENTA
    PHARMACEUTICALS,&nbsp;INC.</font></b></p>
    </td>
   </tr>
   <tr height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="365" colspan="2" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:3.8in;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:23.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="333" height="17" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;height:12.4pt;padding:0in 0in 0in 0in;width:249.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Richard P. Shea</font></p>
    </td>
   </tr>
   <tr height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:23.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="333" height="17" valign="top" style="border:none;height:12.4pt;padding:0in 0in 0in 0in;width:249.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Richard P. Shea</font></p>
    </td>
   </tr>
   <tr height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:23.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="333" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:249.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chief Financial Officer</font></p>
    </td>
   </tr>
   <tr height="17" style="height:12.4pt;">
    <td width="355" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:266.35pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:23.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="333" height="17" valign="top" style="height:12.4pt;padding:0in 0in 0in 0in;width:249.8pt;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Principal Financial
    Officer)</font></p>
    </td>
   </tr>
  </table>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: May&nbsp;7, 2008</font></p>
  
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">EXHIBIT INDEX</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
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    <p style="margin:0in 0in .0001pt;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;No.</font></b></p>
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    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
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    <td width="82%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:82.68%;">
    <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>
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    <td width="12%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:12.34%;">
    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
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    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
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    <p style="margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press Release issued by
    Momenta Pharmaceuticals,&nbsp;Inc. on May&nbsp;7, 2008.</font></p>
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  <p align="center" style="margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>
  
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metadata_filer: {"company-data": {"conformed-name": "MOMENTA PHARMACEUTICALS INC", "cik": "0001235010", "assigned-sic": "2836", "irs-number": "043561634", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-50797", "film-number": "08808301"}, "business-address": {"street1": "675 WEST KENDALL STREET", "city": "CAMBRIDGE", "state": "MA", "zip": "02142", "phone": "617 491-9700"}, "mail-address": {"street1": "675 WEST KENDALL STREET", "city": "CAMBRIDGE", "state": "MA", "zip": "02142"}}
text: UNITED
  STATES
  SECURITIES
  AND EXCHANGE COMMISSION
  Washington,
  D.C. 20549
  FORM 8-K
  CURRENT REPORT
  PURSUANT TO SECTION 13 OR 15(d) OF THE
  SECURITIES EXCHANGE ACT OF 1934
  Date of report
  (Date of earliest event reported)
  May 7,
  2008 (May 7, 2008)
  Momenta
  Pharmaceuticals, Inc.
  (Exact Name of
  Registrant as Specified in Charter)
  Delaware
  (State or Other Jurisdiction
  of Incorporation)
  000-50797
  (Commission File Number)
  04-3561634
  (IRS Employer
  Identification No.)
  675
    West Kendall Street, Cambridge, MA
  (Address of Principal Executive Offices)
  02142
  (Zip Code)
  (617)
  491-9700
  (Registrant's telephone number, including area
  code)
  (Former Name or
  Former Address, if Changed Since Last Report)
  Check the appropriate box
  below if the Form 8-K filing is intended to simultaneously satisfy the
  filing obligation of the registrant under any of the following provisions (
  see
  General Instruction A.2. below):
  o
  Written communications pursuant to Rule 425 under the Securities Act (17
  CFR 230.425)
  o
  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
  240.14a-12)
  o
  Pre-commencement communications pursuant to Rule 14d-2(b) under the
  Exchange Act (17 CFR 240.14d-2(b))
  o
  Pre-commencement communications pursuant to Rule 13e-4(c) under the
  Exchange Act (17 CFR 240.13e-4(c))
  Item
  2.02.  Results of Operations and Financial Condition
  On May 7, 2008,
  Momenta Pharmaceuticals, Inc., a Delaware corporation, announced its
  financial results for the quarter ended March 31, 2008.  The full
  text of the press release issued in connection with the announcement is
  furnished as Exhibit 99.1 to this Current Report on Form 8-K.
  The information in this Form 8-K
  (including Exhibit 99.1) shall not be deemed "filed" for purposes of Section 18
  of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
  otherwise subject to the liabilities of that section, nor shall it be deemed
  incorporated by reference in any filing under the Securities Act of 1933, as
  amended, or the Exchange Act, except as expressly set forth by specific
  reference in such a filing.
  Item
  9.01.  Financial Statements and Exhibits
  (d)
  Exhibits
  The following exhibit
  relating to Item 2.02 shall be deemed to be furnished, and not filed:
  99.1.  Press Release
  issued by Momenta Pharmaceuticals, Inc. on May 7, 2008.
  2
  SIGNATURES
  Pursuant to the
  requirements of the Securities Exchange Act of 1934, the registrant has duly
  caused this report to be signed on its behalf by the undersigned, hereunto duly
  authorized.
  MOMENTA
    PHARMACEUTICALS, INC.
  By:
  /s/ Richard P. Shea
  Richard P. Shea
  Chief Financial Officer
  (Principal Financial
    Officer)
  Date: May 7, 2008
  3
  EXHIBIT INDEX
  Exhibit No.
  Description
  99.1
  Press Release issued by
    Momenta Pharmaceuticals, Inc. on May 7, 2008.
  4