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  <p  align="center"><font size="2" face="Times New Roman"><b>As filed with the Securities and Exchange Commission on August 2, 2006</b></font></p>
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  <font size="2" face="Times New Roman"><b>Registration No. 333_____ </b></font></p>
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  <font size="5" face="Times New Roman"><b>SECURITIES AND EXCHANGE<br> COMMISSION</b></font><b> <br> </b>
  <font size="3"><b>Washington, D.C. 20549 </b></font></p>
  
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  <font size="5" face="Times New Roman"><b>FORM S-8<br> </b></font>
  <font size="3"><b>REGISTRATION STATEMENT UNDER <br> </b>THE SECURITIES ACT OF 1933</font></p>
  
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  <font size="6" face="Times New Roman"><b>ENTERPRISE FINANCIAL SERVICES CORP <br> </b></font>
  <font size="1" face="Times New Roman"><b>(Exact name of registrant as specified in its charter) </b></font></p>
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  <font size="2" face="Times New Roman"><b>Delaware</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="2" face="Times New Roman"><b>43-1706529</b></font></p>  </td>
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  <font size="1" face="Times New Roman"><b>(State or other jurisdiction<br>   of incorporation or organization)</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="1" face="Times New Roman"><b>(I.R.S. Employer<br> Identification No.)</b></font></p>  </td>
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    <p  align="center"><font size="2" face="Times New Roman"><b>150 North Meramec</b></font></p>  </td>
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  <font size="2" face="Times New Roman"><b>Clayton, Missouri&#160;   63105</b></font></p>  </td>
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  <font size="1" face="Times New Roman"><b>(Address, including zip code, and telephone number,   including area code, of registrant&#146;s principal executive offices)</b></font></p>  </td>
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  <font size="2" face="Times New Roman"><b>Enterprise Financial Services Corp Amended and Restated 2002 Stock Incentive Plan and<br> Enterprise Financial Services Corp Stock Plan for Non-Management Directors<br> </b></font>
  <font size="1" face="Times New Roman"><b>(Full title of the plans)</b></font></p>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="2" face="Times New Roman"><b>Copy to:</b></font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="2" face="Times New Roman"><b>Frank H. Sanfilippo<br>   Chief Financial Officer<br>   Enterprise Financial Services Corp<br>   150 North Meramec<br>   Clayton, Missouri 63105<br>   (314) 725-5500</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="2" face="Times New Roman"><b>Joseph S. von Kaenel, Esq.<br>   Armstrong Teasdale LLP<br>   One Metropolitan Square, Suite 2600<br>   St. Louis, Missouri 63102-2740<br>   (314) 621-5070</b></font></p>  </td>
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    <p  align="center"><font size="1" face="Times New Roman"><b>(Name,   address and telephone number<br>   of agent for service)</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="2" face="Times New Roman"><b>CALCULATION OF REGISTRATION FEE</b></font></p>
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  <font size="1" face="Times New Roman"><b>Title of   Securities To Be Registered<sup>1</sup></b></font></p>  </td>
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  <font size="1" face="Times New Roman"><b>Amount of<br>   Shares To Be<br>   Registered<sup>2</sup></b></font></p>  </td>
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  <font size="1" face="Times New Roman"><b>Proposed   Maximum<br>   Offering Price Per<br>   Share<sup>3</sup></b></font></p>  </td>
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  <font size="1" face="Times New Roman"><b>Proposed   Maximum<br>   Aggregate Offering<br>   Price</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="1" face="Times New Roman"><b>Amount of<br>   Registration Fee (2)</b></font></p>  </td>
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    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">Common Stock, par value   $0.01, issued or to be issued under the Enterprise Financial Services Corp   Amended and Restated 2002 Stock Incentive Plan<sup>4</sup></font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">750,000</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">27.73</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">20,797,500</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">2,225.33</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">Common Stock, par value   $0.01, issued or to be issued under the Enterprise Financial Services Corp   Stock Plan for Non-Management Directors</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">100,000</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">27.73</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">2,773,000</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">296.71</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">Total Registration Fee</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">N/A</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">N/A</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">N/A</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman">$</font></p>  </td>
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  <font size="2" face="Times New Roman">2,522.04</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman"><sup>1</sup>   The securities to be registered include options and rights to acquire Common   Stock.</font></p>  </td>
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  <font size="2" face="Times New Roman"><sup>2</sup>   Pursuant to Rule 416, this registration statement covers any additional   securities that may be offered or issued in connection with any stock split,   stock dividend, recapitalization or any similar transaction effected without   receipt of additional consideration, which results in an increase in   Registrant&#146;s outstanding shares of Common Stock.</font></p>  </td>
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  <font size="2" face="Times New Roman"><sup>3</sup>   Estimated in accordance with Rule 457(h) solely for purposes of calculating   the registration fee and based upon the average of the reported high and low   sale prices on July 31, 2006.</font></p>  </td>
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  <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman"><sup>4</sup>   This Plan relates to a total of 1,500,000 shares, 750,000 of which were added   when the Plan was amended and restated.&#160;   The 750,000 shares initially included in the Plan were previously   registered and this Registration Statement relates to 750,000 shares added to   the Plan when it was amended and restated.</font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <font size="2" face="Times New Roman"><b>This Registration Statement shall become   effective upon filing in accordance with Rule 462.</b></font></p>  </td>
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  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  
  <p  align="center"><font size="2" face="Times New Roman"><b>INTRODUCTION</b></font></p>
  <p  align="center">
  <font size="2" face="Times New Roman"><b>PART I</b></font></p>
  <p  align="center">
  <font size="2" face="Times New Roman"><b>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS </b></font></p>
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  <font size="2" face="Times New Roman"><b>Item 1.</b></font></p>  </td>
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  <font size="2" face="Times New Roman"><b><u>Plan Information.</u></b></font></p>  </td>
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  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Information required by Item 1 of Part I of Form S-8 is omitted from this Registration Statement in accordance with Rule 428 under the Securities Act of 1933, as amended (&#147;1933 Act&#148;), and the Note to Part I of Form S-8. </font></p>
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  <font size="2" face="Times New Roman"><b>Item 2.</b></font></p>  </td>
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  <font size="2" face="Times New Roman"><b><u>Registration Information and Employee Plan Annual Information.</u></b></font></p>  </td>
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  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Information required by Item 2 of Part I of Form S-8 is omitted from this Registration Statement in accordance with Rule 428 under the 1933 Act and the Note to Part I of Form S-8. </font></p>
  <p  align="center">
  <font size="2" face="Times New Roman">1</font></p>
  
  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  <p  align="center">
  <font size="2" face="Times New Roman"><b>PART II. INFORMATION REQUIRED IN THE REGISTRATION STATEMENT </b></font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 3.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Incorporation of Documents by Reference.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents are hereby incorporated by reference into this registration statement: </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Registrant&#146;s Annual Report on Form 10-K for the fiscal year ended December 31, 2005, filed with the Securities and Exchange Commission (the &#147;Commission&#148;) on March 7, 2006, which contained audited consolidated financial statements for the most recent fiscal year for which such statements have been filed. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All other reports filed by Registrant pursuant to Section 13(a) or 15(d) of the Securities Act of 1934, as amended (the &#147;Exchange Act&#148;), since the end of the fiscal year covered by the Annual Report on Form 10-K referred to in paragraph (a) above. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The description of Registrant&#146;s common stock, which is contained in a registration statement filed on Form S-1, by Registrant with the Commission on October 24, 1996, registration number 333-14737. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, all documents subsequently filed by 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 have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference into this registration statement and to be a part hereof from the date of filing of such documents.&#160; Any statement 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 deemed to be incorporated by reference herein modifies or supersedes such statement.&#160; 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>
  
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 4.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Description of Securities.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable. </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 5.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Interests of Named Experts and Counsel.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable. </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 6.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Indemnification of Directors and Officers.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section 102 of the Delaware General Corporation Law, or DGCL, as amended, allows a corporation to eliminate the personal liability of directors of a corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except where the director breached the 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 the DGCL or obtained an improper personal benefit. </font></p>
  
  <p  align="center"><font size="2" face="Times New Roman">2</font></p>
  
  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section 145 of the DGCL provides, among other things, that the Registrant may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding other than an action by or in the right of the Registrant, by reason of the fact that the person is or was a director, officer, agent or employee of the Registrant, or is or was serving at the Registrant&#146;s request as a director, officer, agent or employee of another corporation, partnership, joint venture, trust or other enterprise, against expenses, including attorneys&#146; fees, judgments, fines and amounts paid in settlement actually and reasonably incurred by the person in connection with such action, suit or proceeding, if such person acting in good faith and in a manner he or she reasonably believed to be in the best interests, 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. The power to indemnify applies to actions brought by or in the right of the Registrant as well, but only to the extent of defense expenses, reasonably incurred and not to any satisfaction of judgment or settlement of the claim itself, and with the further limitation that in such actions no indemnification shall be made in the event of any adjudication of liability to the Registrant, unless the court believes that in light of all the circumstances indemnification should apply.&#160; Furthermore, under the DGCL, if such person is successfully on the merits or otherwise in the defense of any action referred to above, or in the defense of any claim, issue or matter therein, such person shall be indemnified against expenses (including attorneys&#146; fees) actually and reasonably incurred by such person in connection therewith. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section 174 of the DGCL provides, among other things, that a director, who willfully or negligently approves an unlawful payment of dividends or an unlawful purchase or redemption of stock, may be held liable for such actions.&#160; A director who was either absent when the unlawful actions were approved or dissented at the time, may avoid liability by causing his or her dissent to such actions to be entered in the books containing minutes of the meetings of the board of directors at the time such action occurred or immediately after such absent director receives notice of the unlawful acts. </font></p>
  
  <p><font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As permitted by the DGCL, the Registrant&#146;s certificate of incorporation includes a provision to eliminate the personal liability of its directors for monetary damages for breach of alleged breach of their fiduciary duties as directors, subject to limited exceptions.&#160; The certificate of incorporation also provides that every person who is or was our director, officer, employee or agent or is or was a director, officer, trustee, employee or agent of any other enterprise, serving as such at the Registrant&#146;s request, shall be indemnified to the fullest extent permitted by law for all expenses and liabilities in connection with any proceeding involving such person in this capacity. </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 7.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Exemption from Registration Claimed.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable. </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 8.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Exhibits.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Exhibits to this registration statement are listed in the Index to Exhibits which immediately follows the signature pages hereto. </font></p>
  <p  align="center">
  <font size="2" face="Times New Roman">3</font></p>
  
  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="10%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>Item 9.</b></font></p>  </td>
    <td width="90%" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b><u>Undertakings.</u></b></font></p>  </td>
   </tr>
  </table>
  
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant hereby undertakes: </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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 the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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. </font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The 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 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan&#146;s annual report pursuant to 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 file offering thereof. </font></p>
  
  <p><font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&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 Commission such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.&#160; 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. </font></p>
  <p  align="center">
  <font size="2" face="Times New Roman">4</font></p>
  
  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  <p  align="center">
  <font size="2" face="Times New Roman"><b>SIGNATURES</b></font></p>
  <p>
  <font size="2" face="Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all 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 the County of St. Louis, State of Missouri, <br>
  on August 1, 2006. </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  colspan="2" valign="top">
    <p>
  <font size="2" face="Times New Roman"><b>E</b><b>NTERPRISE F</b><b>INANCIAL S</b><b>ERVICES C</b><b>ORP</b></font></p>  </td>
   </tr>
   <tr>
    <td width="60%" valign="top">
    <p><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td width="5%" valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td width="35%" valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td width="60%" valign="top">
    <p><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td width="5%" valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td width="35%" valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">By:</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">/s/ Frank H.   Sanfilippo</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
   </tr>
   <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Frank H.   Sanfilippo</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Chief   Financial Officer </font></p>  </td>
   </tr>
  </table>
  
  <p  align="center">
  <font size="2" face="Times New Roman"><b>POWER OF ATTORNEY</b></font></p>
  <p>
  <font size="2" face="Times New Roman">We, the undersigned directors of Enterprise Financial Services Corp, hereby severally constitute and appoint Kevin C. Eichner and Frank H. Sanfilippo and each of them, our true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for each of us in our name, place, and stead, in any and all capacities, to sign Enterprise Financial Services Corp&#146;s registration statement on Form S-8, and any other registration statement relating to the same offering, and any and all amendments thereto (including post-effective amendments), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, and hereby grant to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to all intents and purposes as each of us might or could do in person, hereby
  ratifying and confirming all that said attorneys-in-fact and agents or any of them or his or their substitute or substitutes may lawfully do or cause to be done by virtue hereof. </font></p>
  
  <p><font size="2" face="Times New Roman">Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated: </font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
   <tr>
    <td width="32%" valign="top">
    <p align="center" style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman"><b>Signature</b></font></p>  </td>
    <td width="2%" valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td width="42%" valign="top">
    <p  align="center">
  <font size="1" face="Times New Roman"><b>Title</b></font></p>  </td>
    <td width="2%" valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td width="22%" valign="top">
    <p  align="center">
  <font size="1" face="Times New Roman"><b>Date</b></font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">/s/ Peter F. Benoist </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td rowspan="2"  valign="top">
    <p align="center">
  <font size="2" face="Times New Roman">Executive   Vice President and <br>
  Chairman of the Board of Directors</font></p>
    </td>
    <td rowspan="2"  valign="top">
  
    <p>
    <font size="1" face="Times New Roman">&nbsp;</font></p></td>
    <td rowspan="2"  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p>
    </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Peter F. Benoist</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">/s/ Kevin C. Eichner </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Chief   Executive Officer and Director</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">Kevin C. Eichner</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">/s/ Paul R. Cahn </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
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    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
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    <td  valign="top">
      <hr size="1" width="100%" noshade color=black>
  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Paul R. Cahn</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
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    <p style="margin-left:1em; text-indent:-1em"><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
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    <p style="margin-left:1em; text-indent:-1em"><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
  
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">William H. Downey</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
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    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">/s/ Robert E. Guest, Jr. </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
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    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p align="center">
  <font size="2" face="Times New Roman">Director</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Robert E. Guest, Jr.</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
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    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">/s/ Lewis A. Levey </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Lewis A. Levey</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
      <hr size="1" width="100%" noshade color=black>
  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August   1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Richard S. Masinton</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">/s/ Birch M. Mullins </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Birch M. Mullins</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
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    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">/s/ James J. Murphy </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
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    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">James J. Murphy</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
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    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Robert E. Saur</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em"><font size="2" face="Times New Roman">/s/ Sandra Van Trease </font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Sandra Van Trease</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">Director</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center"><font size=2 face="Times New Roman">August 1, 2006</font></p> </td>
   </tr>
   <tr>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="2" face="Times New Roman">Henry D. Warshaw</font></p>  </td>
    <td  valign="top">
    <p style="margin-left:1em; text-indent:-1em">
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p  align="center"><font size=1 face="Times New Roman">&nbsp;</font></p> </td>
    <td  valign="top">
    <p  align="center">
  <font size="2" face="Times New Roman">&nbsp;</font></p>  </td>
   </tr>
  </table>
  
  <font size="2" face="Times New Roman"><br
  clear=all>
  </font>
  
  <p  align="center"><font size="2" face="Times New Roman">5</font></p>
  
  <div style="page-break-before:always"></div>
  <PAGE>
  <br>
  
  <p  align="center">
  <font size="2" face="Times New Roman"><b><u>INDEX TO EXHIBITS</u></b></font></p>
  <table align="center"  border="0" style="border-collapse:collapse" cellspacing="0"  cellpadding="0"  width="100%">
  
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>Exhibit No.</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>Description</b></font></p>  </td>
   </tr>
  
   <tr>
    <td width="10%" valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
    <td width="2%" valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td width="88%" valign="top">
    <hr size="1" width="100%" noshade color=black>
  
  
    </td>
   </tr>
   <tr>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">4.1</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Enterprise   Financial Service Corp 2002 Amended and Restated Stock Incentive Plan   (incorporated by reference to Appendix B of the Registrant&#146;s Definitive Proxy   Statement dated March 13, 2006)</font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">4.2</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Enterprise   Financial Services Corp Stock Plan for Non-Management Directors (incorporated   by reference to Appendix A of the Registrant&#146;s Definitive Proxy Statement   dated March 13, 2006)</font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">5.1</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Opinion of   Armstrong Teasdale LLP</font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p><font size="2" face="Times New Roman">23.1</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Consent of   Independent Registered Public Accounting Firm</font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">23.2</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Consent of   Armstrong Teasdale LLP (included in Exhibit 5.1)</font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman"><b>&nbsp;</b></font></p>  </td>
   </tr>
  <tr>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">24.1</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="1" face="Times New Roman">&nbsp;</font></p>  </td>
    <td  valign="top">
    <p>
  <font size="2" face="Times New Roman">Power of   Attorney (contained within signature page)</font></p>  </td>
   </tr>
  </table>
  
  </body>
  
  </html>
metadata_documents: [{"type": "S-8", "sequence": "1", "filename": "ef71893.htm", "description": "FORM S-8", "secsgml_size_bytes": 71062}]
metadata_filer: {"company-data": {"conformed-name": "ENTERPRISE FINANCIAL SERVICES CORP", "cik": "0001025835", "assigned-sic": "6022", "irs-number": "431706259", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-136230", "film-number": "06996969"}, "business-address": {"street1": "150 NORTH MERAMEC", "street2": "150 NORTH MERAMEC", "city": "CLAYTON", "state": "MO", "zip": "63105", "phone": "3147255500"}, "mail-address": {"street1": "150 NORTH MERAMEC", "street2": "150 NORTH MERAMEC", "city": "CLAYTON", "state": "MO", "zip": "63105"}, "former-company": {"former-conformed-name": "ENTERBANK HOLDINGS INC", "date-changed": "19961024"}}
text: As filed with the Securities and Exchange Commission on August 2, 2006
  Registration No. 333_____
  SECURITIES AND EXCHANGE
  COMMISSION
  Washington, D.C. 20549
  FORM S-8
  REGISTRATION STATEMENT UNDER
  THE SECURITIES ACT OF 1933
  ENTERPRISE FINANCIAL SERVICES CORP
  (Exact name of registrant as specified in its charter)
  Delaware
  43-1706529
  (State or other jurisdiction
  of incorporation or organization)
  (I.R.S. Employer
  Identification No.)
  150 North Meramec
  Clayton, Missouri    63105
  (Address, including zip code, and telephone number,   including area code, of registrant's principal executive offices)
  Enterprise Financial Services Corp Amended and Restated 2002 Stock Incentive Plan and
  Enterprise Financial Services Corp Stock Plan for Non-Management Directors
  (Full title of the plans)
  Copy to:
  Frank H. Sanfilippo
  Chief Financial Officer
  Enterprise Financial Services Corp
  150 North Meramec
  Clayton, Missouri 63105
  (314) 725-5500
  Joseph S. von Kaenel, Esq.
  Armstrong Teasdale LLP
  One Metropolitan Square, Suite 2600
  St. Louis, Missouri 63102-2740
  (314) 621-5070
  (Name,   address and telephone number
  of agent for service)
  CALCULATION OF REGISTRATION FEE
  Title of   Securities To Be Registered
  1
  Amount of
  Shares To Be
  Registered
  2
  Proposed   Maximum
  Offering Price Per
  Share
  3
  Proposed   Maximum
  Aggregate Offering
  Price
  Amount of
  Registration Fee (2)
  Common Stock, par value   $0.01, issued or to be issued under the Enterprise Financial Services Corp   Amended and Restated 2002 Stock Incentive Plan
  4
  750,000
  $
  27.73
  $
  20,797,500
  $
  2,225.33
  Common Stock, par value   $0.01, issued or to be issued under the Enterprise Financial Services Corp   Stock Plan for Non-Management Directors
  100,000
  $
  27.73
  $
  2,773,000
  $
  296.71
  Total Registration Fee
  N/A
  N/A
  N/A
  $
  2,522.04
  1
  The securities to be registered include options and rights to acquire Common   Stock.
  2
  Pursuant to Rule 416, this registration statement covers any additional   securities that may be offered or issued in connection with any stock split,   stock dividend, recapitalization or any similar transaction effected without   receipt of additional consideration, which results in an increase in   Registrant's outstanding shares of Common Stock.
  3
  Estimated in accordance with Rule 457(h) solely for purposes of calculating   the registration fee and based upon the average of the reported high and low   sale prices on July 31, 2006.
  4
  This Plan relates to a total of 1,500,000 shares, 750,000 of which were added   when the Plan was amended and restated.    The 750,000 shares initially included in the Plan were previously   registered and this Registration Statement relates to 750,000 shares added to   the Plan when it was amended and restated.
  This Registration Statement shall become   effective upon filing in accordance with Rule 462.
  INTRODUCTION
  PART I
  INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
  Item 1.
  Plan Information.
  Information required by Item 1 of Part I of Form S-8 is omitted from this Registration Statement in accordance with Rule 428 under the Securities Act of 1933, as amended ("1933 Act"), and the Note to Part I of Form S-8.
  Item 2.
  Registration Information and Employee Plan Annual Information.
  Information required by Item 2 of Part I of Form S-8 is omitted from this Registration Statement in accordance with Rule 428 under the 1933 Act and the Note to Part I of Form S-8.
  1
  PART II. INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
  Item 3.
  Incorporation of Documents by Reference.
  The following documents are hereby incorporated by reference into this registration statement:
  (a)           Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2005, filed with the Securities and Exchange Commission (the "Commission") on March 7, 2006, which contained audited consolidated financial statements for the most recent fiscal year for which such statements have been filed.
  (b)          All other reports filed by Registrant pursuant to Section 13(a) or 15(d) of the Securities Act of 1934, as amended (the "Exchange Act"), since the end of the fiscal year covered by the Annual Report on Form 10-K referred to in paragraph (a) above.
  (c)          The description of Registrant's common stock, which is contained in a registration statement filed on Form S-1, by Registrant with the Commission on October 24, 1996, registration number 333-14737.
  In addition, all documents subsequently filed by 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 have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference into this registration statement and to be a part hereof from the date of filing of such documents.  Any statement 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 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.
  Item 5.
  Interests of Named Experts and Counsel.
  Not Applicable.
  Item 6.
  Indemnification of Directors and Officers.
  Section 102 of the Delaware General Corporation Law, or DGCL, as amended, allows a corporation to eliminate the personal liability of directors of a corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except where the director breached the 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 the DGCL or obtained an improper personal benefit.
  2
  Section 145 of the DGCL provides, among other things, that the Registrant may indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding other than an action by or in the right of the Registrant, by reason of the fact that the person is or was a director, officer, agent or employee of the Registrant, or is or was serving at the Registrant's request as a director, officer, agent or employee of another corporation, partnership, joint venture, trust or other enterprise, against expenses, including attorneys' fees, judgments, fines and amounts paid in settlement actually and reasonably incurred by the person in connection with such action, suit or proceeding, if such person acting in good faith and in a manner he or she reasonably believed to be in the best interests, 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. The power to indemnify applies to actions brought by or in the right of the Registrant as well, but only to the extent of defense expenses, reasonably incurred and not to any satisfaction of judgment or settlement of the claim itself, and with the further limitation that in such actions no indemnification shall be made in the event of any adjudication of liability to the Registrant, unless the court believes that in light of all the circumstances indemnification should apply.  Furthermore, under the DGCL, if such person is successfully on the merits or otherwise in the defense of any action referred to above, or in the defense of any claim, issue or matter therein, such person shall be indemnified against expenses (including attorneys' fees) actually and reasonably incurred by such person in connection therewith.
  Section 174 of the DGCL provides, among other things, that a director, who willfully or negligently approves an unlawful payment of dividends or an unlawful purchase or redemption of stock, may be held liable for such actions.  A director who was either absent when the unlawful actions were approved or dissented at the time, may avoid liability by causing his or her dissent to such actions to be entered in the books containing minutes of the meetings of the board of directors at the time such action occurred or immediately after such absent director receives notice of the unlawful acts.
  As permitted by the DGCL, the Registrant's certificate of incorporation includes a provision to eliminate the personal liability of its directors for monetary damages for breach of alleged breach of their fiduciary duties as directors, subject to limited exceptions.  The certificate of incorporation also provides that every person who is or was our director, officer, employee or agent or is or was a director, officer, trustee, employee or agent of any other enterprise, serving as such at the Registrant's request, shall be indemnified to the fullest extent permitted by law for all expenses and liabilities in connection with any proceeding involving such person in this capacity.
  Item 7.
  Exemption from Registration Claimed.
  Not Applicable.
  Item 8.
  Exhibits.
  The Exhibits to this registration statement are listed in the Index to Exhibits which immediately follows the signature pages hereto.
  3
  Item 9.
  Undertakings.
  The Registrant hereby undertakes:
  (a)          To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
  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.
  (b)          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 the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
  (c)          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.
  The 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 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to 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 file offering thereof.
  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 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.
  4
  SIGNATURES
  Pursuant to the requirements of the Securities Act of 1933, as amended, the registrant certifies that it has reasonable grounds to believe that it meets all 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 the County of St. Louis, State of Missouri,
  on August 1, 2006.
  E
  NTERPRISE F
  INANCIAL S
  ERVICES C
  ORP
  By:
  /s/ Frank H.   Sanfilippo
  Frank H.   Sanfilippo
  Chief   Financial Officer
  POWER OF ATTORNEY
  We, the undersigned directors of Enterprise Financial Services Corp, hereby severally constitute and appoint Kevin C. Eichner and Frank H. Sanfilippo and each of them, our true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for each of us in our name, place, and stead, in any and all capacities, to sign Enterprise Financial Services Corp's registration statement on Form S-8, and any other registration statement relating to the same offering, and any and all amendments thereto (including post-effective amendments), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, and hereby grant to such attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to all intents and purposes as each of us might or could do in person, hereby
  ratifying and confirming all that said attorneys-in-fact and agents or any of them or his or their substitute or substitutes may lawfully do or cause to be done by virtue hereof.
  Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated:
  Signature
  Title
  Date
  /s/ Peter F. Benoist
  Executive   Vice President and
  Chairman of the Board of Directors
  August   1, 2006
  Peter F. Benoist
  /s/ Kevin C. Eichner
  Chief   Executive Officer and Director
  August   1, 2006
  Kevin C. Eichner
  /s/ Paul R. Cahn
  Director
  August   1, 2006
  Paul R. Cahn
  Director
  August   1, 2006
  William H. Downey
  /s/ Robert E. Guest, Jr.
  Director
  August   1, 2006
  Robert E. Guest, Jr.
  /s/ Lewis A. Levey
  Director
  August 1, 2006
  Lewis A. Levey
  Director
  August   1, 2006
  Richard S. Masinton
  /s/ Birch M. Mullins
  Director
  August 1, 2006
  Birch M. Mullins
  /s/ James J. Murphy
  Director
  August 1, 2006
  James J. Murphy
  Director
  August 1, 2006
  Robert E. Saur
  /s/ Sandra Van Trease
  Director
  August 1, 2006
  Sandra Van Trease
  Director
  August 1, 2006
  Henry D. Warshaw
  5
  INDEX TO EXHIBITS
  Exhibit No.
  Description
  4.1
  Enterprise   Financial Service Corp 2002 Amended and Restated Stock Incentive Plan   (incorporated by reference to Appendix B of the Registrant's Definitive Proxy   Statement dated March 13, 2006)
  4.2
  Enterprise   Financial Services Corp Stock Plan for Non-Management Directors (incorporated   by reference to Appendix A of the Registrant's Definitive Proxy Statement   dated March 13, 2006)
  5.1
  Opinion of   Armstrong Teasdale LLP
  23.1
  Consent of   Independent Registered Public Accounting Firm
  23.2
  Consent of   Armstrong Teasdale LLP (included in Exhibit 5.1)
  24.1
  Power of   Attorney (contained within signature page)