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  <p style="border:none;margin:0in 0in .0001pt;padding:0in;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;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><b><font size="2" style="font-size:10.0pt;font-weight:bold;"><br>
  Washington, D.C.&nbsp;&nbsp;20549</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;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;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">Current Report Pursuant to
  Section&nbsp;13 or 15(d)<br>
  of the Securities Exchange Act of 1934</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">May&nbsp;9, 2008</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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)</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">Arch Capital Group Ltd.</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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 its charter)</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="center">
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Bermuda</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">0-26456</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">N/A</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other<br>
    jurisdiction of<br>
    incorporation or<br>
    organization)</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(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;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><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="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="100%" colspan="5" valign="top" style="padding:0in .7pt 0in .7pt;width:100.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Wessex House, 45 Reid
    Street, Hamilton HM 12, Bermuda</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="100%" colspan="5" valign="top" style="padding:0in .7pt 0in .7pt;width:100.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address of principal
    executive offices) (Zip Code)</font></p>
    </td>
   </tr>
   <tr>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.0%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="32%" valign="top" style="padding:0in .7pt 0in .7pt;width:32.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="100%" colspan="5" valign="top" style="padding:0in .7pt 0in .7pt;width:100.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registrant&#146;s telephone
    number, including area code:</font></p>
    </td>
   </tr>
   <tr>
    <td width="100%" colspan="5" valign="top" style="padding:0in .7pt 0in .7pt;width:100.0%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(441) 278-9250</font></b></p>
    </td>
   </tr>
  </table>
  
  </div>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">N/A</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;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;punctuation-wrap:simple;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 (see General Instruction A.2.
  below):</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div align="center">
  
  <table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
   <tr>
    <td width="3%" valign="top" style="padding:0in .7pt 0in .7pt;width:3.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
    </td>
    <td width="96%" valign="top" style="padding:0in .7pt 0in .7pt;width:96.54%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Written communications pursuant to Rule&nbsp;425
    under the Securities Act (17 CFR 230.425)</font></p>
    </td>
   </tr>
   <tr>
    <td width="3%" valign="top" style="padding:0in .7pt 0in .7pt;width:3.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
    </td>
    <td width="96%" valign="top" style="padding:0in .7pt 0in .7pt;width:96.54%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12
    under the Exchange Act (17 CFR 240.14a-12)</font></p>
    </td>
   </tr>
   <tr>
    <td width="3%" valign="top" style="padding:0in .7pt 0in .7pt;width:3.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
    </td>
    <td width="96%" valign="top" style="padding:0in .7pt 0in .7pt;width:96.54%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pre-commencement communications pursuant to
    Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17 CFR 240.14d-2(b))</font></p>
    </td>
   </tr>
   <tr>
    <td width="3%" valign="top" style="padding:0in .7pt 0in .7pt;width:3.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>
    </td>
    <td width="96%" valign="top" style="padding:0in .7pt 0in .7pt;width:96.54%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pre-commencement communications pursuant to
    Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17 CFR 240.13e-4(c))</font></p>
    </td>
   </tr>
  </table>
  
  </div>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</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;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  </div>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <div style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\dchen\08-14236-1\task2934818\14236-1-ba.htm',USER='dchen',CD='May 12 16:58 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div style="font-family:Times New Roman;">
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-align:center;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 7.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <u>Regulation
  FD Disclosure</u>.</font></b></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:hanging;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On May&nbsp;12,
  2008, Arch Capital Group Ltd. (&#147;ACGL&#148;) issued a press release announcing that
  its Board of Directors (the &#147;Board&#148;) approved an additional share repurchase
  authorization (the &#147;Additional Repurchase Authorization&#148;).&#160; A copy of this press release is attached to
  this Current Report on Form&nbsp;8-K as Exhibit&nbsp;99.1 and is incorporated
  herein by reference.</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:hanging;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information in this Current Report on Form&nbsp;8-K,
  including the information set forth in 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 incorporated by reference in any filing under
  the Securities Act of 1933, as amended, or the Exchange Act, except as shall be
  expressly set forth by specific reference in such a filing.</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 8.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <u>Other
  Events</u>.</font></b></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:.5in;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Waiver Under Shareholders Agreement</font></u><font size="2" style="font-size:10.0pt;">.&#160;
  As previously disclosed, ACGL has agreed (until 2011) not to declare any
  dividend or make any other distribution on its common shares, and not to repurchase
  any common shares, until ACGL has repurchased from the Warburg Pincus funds
  common shares having an aggregate value of $250&nbsp;million, at a per share
  price acceptable to these funds.&#160; In
  connection with the Additional </font><font size="2" style="font-size:10.0pt;">Repurchase Authorization (defined
  above), the Warburg Pincus funds waived these rights under the shareholders
  agreement for all repurchases of common shares by ACGL under the Additional
  Repurchase Authorization in open market transactions and certain privately
  negotiated transactions.&#160; The
  shareholders agreement is included as Exhibit&nbsp;4.3 to ACGL&#146;s Form&nbsp;10-K
  for the year ended December&nbsp;31, 2005.</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;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;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Preferred Share Dividends</font></u><font size="2" style="font-size:10.0pt;">.&#160; On May&nbsp;9, 2008, the Board declared
  dividends with respect to the outstanding (1)&nbsp;8,000,000 shares of its
  8.00% Non-Cumulative Preferred Shares, Series&nbsp;A, $0.01 per share (the &#147;Series&nbsp;A
  Shares&#148;), with a liquidation preference of $25.00 per share, and (2)&nbsp;5,000,000
  shares of its 7.875% Non-Cumulative Preferred Shares, Series&nbsp;B, $0.01 per
  share (the &#147;Series&nbsp;B Shares&#148;), with a liquidation preference of $25.00 per
  share, as outlined below.&#160; All such
  dividends will be payable out of lawfully available funds for the payment of
  dividends under Bermuda law on August&nbsp;15, 2008 to holders of record of the
  Series&nbsp;A Shares and the Series&nbsp;B Shares, as applicable, as of August&nbsp;1,
  2008, unless determined otherwise by the Board or the Executive Committee of
  the Board on or prior to the applicable effective date.</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;punctuation-wrap:simple;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:100.02%;">
   <tr>
    <td width="9%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:9.0%;">
    <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;">Series</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.2%;">
    <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="18%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:18.54%;">
    <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;">Effective Date<br>
    for Declaration</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <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="21%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:21.54%;">
    <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;">Dividend Period</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <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="24%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:24.3%;">
    <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;">Dividend Amount</font></b></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <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="17%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:17.88%;">
    <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;">Rate Per Share</font></b></p>
    </td>
   </tr>
   <tr>
    <td width="9%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:9.0%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Series&nbsp;A</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.2%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="18%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:18.54%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6/30/08<br>
    8/14/08</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="21%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:21.54%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5/15/08-6/30/08<br>
    7/1/08-8/14/08</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="24%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:24.3%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$2,044,444 <br>
    <u>1,955,556 <br>
    </u>$4,000,000</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="17%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:17.88%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$0.2556 <br>
    <u>0.2444 <br>
    </u>$0.50</font></p>
    </td>
   </tr>
   <tr>
    <td width="9%" valign="top" style="padding:0in .7pt 0in .7pt;width:9.0%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Series&nbsp;B</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.2%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="18%" valign="top" style="padding:0in .7pt 0in .7pt;width:18.54%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6/30/08<br>
    8/14/08</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="21%" valign="top" style="padding:0in .7pt 0in .7pt;width:21.54%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5/15/08-6/30/08<br>
    7/1/08-8/14/08</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="24%" valign="top" style="padding:0in .7pt 0in .7pt;width:24.3%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$1,257,813<br>
    <u>1,203,125</u></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;">$2,460,938</font></p>
    </td>
    <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.18%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="17%" valign="top" style="padding:0in .7pt 0in .7pt;width:17.88%;">
    <p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$0.2516 <br>
    <u>0.2406 <br>
    </u>$0.4922</font></p>
    </td>
   </tr>
  </table>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:hanging;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:hanging;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;punctuation-wrap:simple;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='',FILE='C:\JMS\dchen\08-14236-1\task2934818\14236-1-ba.htm',USER='dchen',CD='May 12 16:58 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 9.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; <u>Financial Statements and
  Exhibits</u>.</font></b></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;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="97%" style="border-collapse:collapse;width:97.96%;">
   <tr>
    <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:10.5%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">EXHIBIT NO.</font></b></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.64%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><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="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:87.88%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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>
    </td>
   </tr>
   <tr>
    <td width="10%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:10.5%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="1%" valign="top" style="padding:0in .7pt 0in .7pt;width:1.64%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><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 .7pt 0in .7pt;width:87.88%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="10%" valign="top" style="padding:0in .7pt 0in .7pt;width:10.5%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>
    </td>
    <td width="1%" valign="top" style="padding:0in .7pt 0in .7pt;width:1.64%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="87%" valign="top" style="padding:0in .7pt 0in .7pt;width:87.88%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press Release dated May&nbsp;12, 2008 announcing
    Arch Capital Group Ltd.&#146;s Additional Repurchase Authorization.</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3</font></p>
  
  <div style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='3',FILE='C:\JMS\dchen\08-14236-1\task2934818\14236-1-ba.htm',USER='dchen',CD='May 12 16:58 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SIGNATURES</font></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-autospace:none;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities
  Exchange Act of 1934, as amended, the registrant has duly caused this report to
  be signed on its behalf by the undersigned.</font></p>
  
  <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;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>
    <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="48%" colspan="2" valign="top" style="padding:0in .7pt 0in .7pt;width:48.9%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">ARCH CAPITAL GROUP LTD.</font></p>
    </td>
   </tr>
   <tr>
    <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="4%" valign="top" style="padding:0in .7pt 0in .7pt;width:4.44%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
    <td width="44%" valign="top" style="padding:0in .7pt 0in .7pt;width:44.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
    </td>
   </tr>
   <tr>
    <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: May&nbsp;12, 2008</font></p>
    </td>
    <td width="4%" valign="top" style="padding:0in .7pt 0in .7pt;width:4.44%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>
    </td>
    <td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:44.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ W. Preston Hutchings&nbsp; </font></p>
    </td>
   </tr>
   <tr>
    <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="4%" valign="top" style="padding:0in .7pt 0in .7pt;width:4.44%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="44%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:44.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name: W. Preston Hutchings </font></p>
    </td>
   </tr>
   <tr>
    <td width="51%" valign="top" style="padding:0in .7pt 0in .7pt;width:51.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="4%" valign="top" style="padding:0in .7pt 0in .7pt;width:4.44%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
    </td>
    <td width="44%" valign="top" style="padding:0in .7pt 0in .7pt;width:44.46%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Title: Senior Vice President</font></p>
    </td>
   </tr>
  </table>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4</font></p>
  
  <div style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
  
  </div>
  <!-- SEQ.=1,FOLIO='4',FILE='C:\JMS\dchen\08-14236-1\task2934818\14236-1-ba.htm',USER='dchen',CD='May 12 16:58 2008' -->
  
  
  <br clear="all" style="page-break-before:always;">
  
  
  <div>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT INDEX</font></b></p>
  
  <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;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>
    <td width="10%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:10.1%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">EXHIBIT NO.</font></b></p>
    </td>
    <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.5%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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>
    </td>
    <td width="88%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:88.4%;">
    <p align="center" style="margin:0in 0in .0001pt;punctuation-wrap:simple;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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    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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    <td width="1%" valign="top" style="padding:0in .7pt 0in .7pt;width:1.5%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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    <td width="88%" valign="top" style="border:none;padding:0in .7pt 0in .7pt;width:88.4%;">
    <p style="margin:0in 0in .0001pt;punctuation-wrap:simple;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;punctuation-wrap:simple;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;punctuation-wrap:simple;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press Release dated May&nbsp;12, 2008 announcing
    Arch Capital Group Ltd.&#146;s Additional Repurchase Authorization.</font></p>
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metadata_filer: {"company-data": {"conformed-name": "ARCH CAPITAL GROUP LTD.", "cik": "0000947484", "assigned-sic": "6331", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-16209", "film-number": "08825054"}, "business-address": {"street1": "WESSEX HOUSE", "street2": "45 REID STREET", "city": "HAMILTON", "state": "D0", "zip": "HM 12", "phone": "441-278-9250"}, "mail-address": {"street1": "WESSEX HOUSE", "street2": "45 REID STREET", "city": "HAMILTON", "state": "D0", "zip": "HM 12"}, "former-company": [{"former-conformed-name": "ARCH CAPITAL GROUP LTD", "date-changed": "20000508"}, {"former-conformed-name": "RISK CAPITAL HOLDINGS INC", "date-changed": "19950816"}, {"former-conformed-name": "RISK CAPITAL RE INC", "date-changed": "19950703"}]}
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
  May 9, 2008
  Date of Report (Date of
  earliest event reported)
  Arch Capital Group Ltd.
  (Exact name of registrant as
  specified in its charter)
  Bermuda
  0-26456
  N/A
  (State or other
  jurisdiction of
  incorporation or
  organization)
  (Commission File Number)
  (I.R.S. Employer
  Identification No.)
  Wessex House, 45 Reid
    Street, Hamilton HM 12, Bermuda
  (Address of principal
    executive offices) (Zip Code)
  Registrant's telephone
    number, including area code:
  (441) 278-9250
  N/A
  (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 7.01
  Regulation
  FD Disclosure
  .
  On May 12,
  2008, Arch Capital Group Ltd. ("ACGL") issued a press release announcing that
  its Board of Directors (the "Board") approved an additional share repurchase
  authorization (the "Additional Repurchase Authorization").  A copy of this press release is attached to
  this Current Report on Form 8-K as Exhibit 99.1 and is incorporated
  herein by reference.
  The information in this Current Report on Form 8-K,
  including the information set forth in 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 incorporated by reference in any filing under
  the Securities Act of 1933, as amended, or the Exchange Act, except as shall be
  expressly set forth by specific reference in such a filing.
  ITEM 8.01
  Other
  Events
  .
  Waiver Under Shareholders Agreement
  . 
  As previously disclosed, ACGL has agreed (until 2011) not to declare any
  dividend or make any other distribution on its common shares, and not to repurchase
  any common shares, until ACGL has repurchased from the Warburg Pincus funds
  common shares having an aggregate value of $250 million, at a per share
  price acceptable to these funds.  In
  connection with the Additional
  Repurchase Authorization (defined
  above), the Warburg Pincus funds waived these rights under the shareholders
  agreement for all repurchases of common shares by ACGL under the Additional
  Repurchase Authorization in open market transactions and certain privately
  negotiated transactions.  The
  shareholders agreement is included as Exhibit 4.3 to ACGL's Form 10-K
  for the year ended December 31, 2005.
  Preferred Share Dividends
  .  On May 9, 2008, the Board declared
  dividends with respect to the outstanding (1) 8,000,000 shares of its
  8.00% Non-Cumulative Preferred Shares, Series A, $0.01 per share (the "Series A
  Shares"), with a liquidation preference of $25.00 per share, and (2) 5,000,000
  shares of its 7.875% Non-Cumulative Preferred Shares, Series B, $0.01 per
  share (the "Series B Shares"), with a liquidation preference of $25.00 per
  share, as outlined below.  All such
  dividends will be payable out of lawfully available funds for the payment of
  dividends under Bermuda law on August 15, 2008 to holders of record of the
  Series A Shares and the Series B Shares, as applicable, as of August 1,
  2008, unless determined otherwise by the Board or the Executive Committee of
  the Board on or prior to the applicable effective date.
  Series
  Effective Date
  for Declaration
  Dividend Period
  Dividend Amount
  Rate Per Share
  Series A
  6/30/08
  8/14/08
  5/15/08-6/30/08
  7/1/08-8/14/08
  $2,044,444
  1,955,556
  $4,000,000
  $0.2556
  0.2444
  $0.50
  Series B
  6/30/08
  8/14/08
  5/15/08-6/30/08
  7/1/08-8/14/08
  $1,257,813
  1,203,125
  $2,460,938
  $0.2516
  0.2406
  $0.4922
  2
  ITEM 9.01
  Financial Statements and
  Exhibits
  .
  EXHIBIT NO.
  DESCRIPTION
  99.1
  Press Release dated May 12, 2008 announcing
    Arch Capital Group Ltd.'s Additional Repurchase Authorization.
  3
  SIGNATURES
  Pursuant to the requirements of the Securities
  Exchange Act of 1934, as amended, the registrant has duly caused this report to
  be signed on its behalf by the undersigned.
  ARCH CAPITAL GROUP LTD.
  Date: May 12, 2008
  By:
  /s/ W. Preston Hutchings
  Name: W. Preston Hutchings
  Title: Senior Vice President
  4
  EXHIBIT INDEX
  EXHIBIT NO.
  DESCRIPTION
  99.1
  Press Release dated May 12, 2008 announcing
    Arch Capital Group Ltd.'s Additional Repurchase Authorization.