content: <HTML>
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  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt">As
  filed with the Securities and Exchange Commission on December&nbsp;20, 2006
  </DIV>
  
  
  <DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt; margin-top: 6pt">&nbsp;</DIV>
  <DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>
  
  
  
  
  <DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
  SECURITIES AND EXCHANGE COMMISSION</B>
  </DIV>
  
  <DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  <DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
  </DIV>
  
  
  <DIV align="center" style="font-size: 12pt; margin-top: 3pt"><B>REGISTRATION STATEMENT<BR>
  <i>UNDER<BR>
  THE SECURITIES ACT OF 1933</i></B>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  <DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>IPG PHOTONICS CORPORATION</B>
  </DIV>
  
  <DIV align="center" style="font-size: 10pt">(Exact Name of registrant as specified in its charter)</DIV>
  
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="31%">&nbsp;</TD>
      <TD width="3%">&nbsp;</TD>
      <TD width="31%">&nbsp;</TD>
      <TD width="3%">&nbsp;</TD>
      <TD width="31%">&nbsp;</TD>
  </TR>
  <!-- End Table Head -->
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  <TR valign="bottom">
      <TD align="center" valign="top"><B>Delaware</B><BR>
  (State or other jurisdiction of <BR>
  incorporation or organization)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top"><B>3674</B><BR>
  (Primary Standard Industrial<BR>
  Classification Code Number)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top"><B>04-3444218</B><BR>
  (I.R.S. Employer Identification Number)</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>IPG Photonics Corporation Non-Employee Directors Stock Plan<BR>
  IPG Photonics Corporation 2000 Incentive Compensation Plan<BR>
  IPG Photonics Corporation 2006 Incentive Compensation Plan</B><BR>
  (Full title of the plans)
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>50 Old Webster Road<BR>
  Oxford, Massachusetts 01540<BR>
  (508)&nbsp;373-1100</B><BR>
  (Address, including zip code, and telephone number, including area code, of registrant&#146;s principal executive offices)
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Valentin P. Gapontsev, Ph.D.<BR>
  Chief Executive Officer and Chairman of the Board<BR>
  IPG Photonics Corporation<BR>
  50 Old Webster Road<BR>
  Oxford, Massachusetts 01540<BR>
  (508)&nbsp;373-1100</B><BR>
  (Name, address, including zip code, and telephone number, including area code, of agent for service)
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B><I>Copy To:</I></B>
  </DIV>
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Robert W. Ericson, Esq.<BR>
  David A. Sakowitz, Esq.<BR>
  Winston &#038; Strawn LLP<BR>
  200 Park Avenue<BR>
  New York, New York 10166-4193<BR>
  (212)&nbsp;294-6700</B>
  </DIV>
  
  <DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>CALCULATION OF REGISTRATION FEE</B>
  </DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="1%">&nbsp;</TD>
      <TD width="54%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD><!-- VRule -->
      <TD width="2%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD><!-- VRule -->
      <TD width="2%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD><!-- VRule -->
      <TD width="2%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD><!-- VRule -->
      <TD width="2%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  
      <TD width="1%">&nbsp;</TD>
  </TR><TR style="font-size: 1px" valign="bottom">
      <TD nowrap align="left" colspan="23" style="border-bottom: 3px double #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>
  
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Proposed</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>
  
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Proposed</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Maximum</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>
  
      <TD nowrap align="center">Title of Each Class of</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Amount</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Maximum</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Aggregate</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Amount of</TD>
      <TD>&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>
  
      <TD nowrap align="center">Securities To</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">To Be</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Offering Price</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Offering</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2">Registration</TD>
      <TD>&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>
  
      <TD nowrap align="center" style="border-bottom: 0px solid #000000">Be Registered</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Registered (1)</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Per Share (2)</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Price (2)</TD>
      <TD>&nbsp;</TD>
      <TD style="border-right: 1px solid #000000">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Fee</TD>
      <TD>&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom" style="background: #cceeff">
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
                      <TD style="border-top: 1px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">COMMON STOCK, $.0001 PAR VALUE PER SHARE, ISSUABLE PURSUANT TO:</DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation Non-Employee Directors Stock Plan</DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD colspan="3" align="center" style="border-top: 1px solid #000000">166,667&nbsp;shares</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">4,050,000</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">433</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR valign="bottom" style="background: #cceeff">
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation 2000 Incentive Compensation Plan</DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD colspan="3" align="center" style="border-top: 1px solid #000000">5,833,333&nbsp;shares</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
  
  <TD align="right" style="border-top: 1px solid #000000">141,750,000</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">15,167</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation 2006 Incentive Compensation Plan</DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD colspan="3" align="center" style="border-top: 1px solid #000000">4,000,000&nbsp;shares</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">97,200,000</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">10,401</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR valign="bottom" style="background: #cceeff">
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000"><DIV style="margin-left:15px; text-indent:-15px"><B><I>TOTAL</I></B></DIV></TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD colspan="3" align="center" style="border-top: 1px solid #000000">10,000,000&nbsp;shares</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
  
  <TD align="right" style="border-top: 1px solid #000000">243,000,000</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD align="left" style="border-top: 1px solid #000000">$</TD>
      <TD align="right" style="border-top: 1px solid #000000">26,001</TD>
      <TD style="border-top: 1px solid #000000">&nbsp;</TD>
      <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
  </TR>
  <TR style="font-size: 1px" valign="bottom">
      <TD nowrap align="left" colspan="23" style="border-top: 3px double #000000">&nbsp;</TD>
  </TR>
  
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" nowrap align="left">(1)</TD>
      <TD width="1%">&nbsp;</TD>
      <TD>In accordance with Rule 416(a) under the Securities Act of 1933, as
  amended, this Registration Statement shall be deemed to cover any
  additional shares of the Registrant&#146;s common stock that become
  issuable under the IPG Photonics Corporation Non-Employee Directors
  Stock Plan, the IPG Photonics Corporation 2000 Incentive Compensation
  Plan or the IPG Photonics Corporation 2006 Incentive Compensation Plan
  as a result of a stock split, stock dividend or similar adjustment of
  the outstanding shares of common stock of IPG Photonics Corporation.</TD>
  </TR>
  
  <TR>
      <TD style="font-size: 6pt">&nbsp;</TD>
  </TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" nowrap align="left">(2)</TD>
      <TD width="1%">&nbsp;</TD>
      <TD>Estimated solely for the purpose of determining the registration fee
  and computed in accordance with Rule 457(c) and 457(h) of the
  Securities Act of 1933, as amended. Such computation is based on the
  average of the high and low prices as reported on The Nasdaq Global
  Market on December&nbsp;18, 2006.</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
  <DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
  
  
  
  
  
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->2<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  
  
  
  <!-- TOC -->
  <A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>
  
  <P><CENTER>
  <TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
  <TR>
  	<TD width="3%"></TD>
  	<TD width="3%"></TD>
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  	<TD width="76%"></TD>
  </TR>
  <TR><TD colspan="9"><A HREF="#000">PART I</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#001">INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#002">PART II</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#003">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#008">Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#009">Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits.</A></TD></TR>
  <TR><TD></TD><TD colspan="8"><A HREF="#010">Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings.</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#011">SIGNATURES</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#012">POWER OF ATTORNEY</A></TD></TR>
  <TR><TD colspan="9"><A HREF="#013">EXHIBIT INDEX</A></TD></TR>
  <TR><TD colspan="9"><A HREF="b63452ipexv5w1.htm">EX-5.1 OPINION OF WINSTON & STRAWN LLP</A></TD></TR>
  <TR><TD colspan="9"><A HREF="b63452ipexv23w1.htm">EX-23.1 CONSENT OF DELOITTE & TOUCHE LLP</A></TD></TR>
  </TABLE>
  </CENTER>
  <!-- /TOC -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  
  
  
  <!-- link1 "PART I" -->
  <DIV align="left"><A NAME="000"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
  </DIV>
  
  <!-- link1 "INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS" -->
  <DIV align="left"><A NAME="001"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IPG Photonics Corporation, a Delaware corporation (the &#147;Registrant&#148;), shall deliver the
  document containing the information in Part&nbsp;I of this Registration Statement on Form S-8 to each
  participant in the IPG Photonics Corporation Non-Employee Directors Stock Plan, the IPG Photonics
  Corporation 2000 Incentive Compensation Plan and the IPG Photonics Corporation 2006 Incentive
  Compensation Plan as specified by Rule&nbsp;428(b)(1) of the Securities Act of 1933, as amended (the
  &#147;1933 Act&#148;). Such document is not being filed with or included in this Registration Statement (by
  incorporation by reference or otherwise) in accordance with the rules and regulations of the
  Securities and Exchange Commission (the &#147;Commission&#148;). Such document and the documents
  incorporated by reference into this Registration Statement pursuant to Item&nbsp;3 of Part&nbsp;II of this
  Registration Statement, taken together, constitute a prospectus that meets the requirements of
  Section 10(a) of the 1933 Act.
  </DIV>
  <!-- link1 "PART II" -->
  <DIV align="left"><A NAME="002"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
  </DIV>
  
  <!-- link1 "INFORMATION REQUIRED IN THE REGISTRATION STATEMENT" -->
  <DIV align="left"><A NAME="003"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
  </DIV>
  
  <!-- link2 "Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference." -->
  <DIV align="left"><A NAME="004"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference.</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents filed by the Registrant with the Commission are incorporated by
  reference in this Registration Statement:
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) the Registrant&#146;s Prospectus filed pursuant to Rule 424(b) under the 1933 Act
  relating to the Registrant&#146;s Registration Statement on Form S-1, as amended (Registration
  No.&nbsp;333-136521); and
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  (b) the description of the Registrant&#146;s common stock, par value $0.0001 per share,
  contained in its Registration Statement on Form&nbsp;8-A/A, filed on
  December&nbsp;7, 2006 pursuant to
  Section 12(b) of the Securities Exchange Act of 1934, as amended (the &#147;1934 Act&#148;), including
  any amendment or report filed for the purpose of updating such description.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents subsequently filed with the Commission by the Registrant pursuant to Sections
  13(a), 13(c), 14 or 15(d) of the 1934 Act prior to the filing of a post-effective amendment, which
  indicates that all securities offered herein have been sold or which deregisters all securities
  then remaining unsold, shall be deemed to be incorporated by reference herein and to be part hereof
  from the respective dates of filing of such documents. Any statement contained herein or in a
  document incorporated or deemed to be incorporated by reference herein shall be deemed to be
  modified or superseded for purposes hereof or for purposes of the related prospectus to the extent
  that a statement contained herein or in any other subsequently filed document which is also
  incorporated or deemed to be incorporated herein modifies or supersedes such statement. Any such
  statement so modified or superseded shall not be deemed, except as so modified or superseded, to
  constitute a part of this Registration Statement.
  </DIV>
  <!-- link2 "Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities." -->
  <DIV align="left"><A NAME="005"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities.</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable.
  </DIV>
  <!-- link2 "Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel." -->
  <DIV align="left"><A NAME="006"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel.</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None.
  </DIV>
  <!-- link2 "Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers." -->
  <DIV align="left"><A NAME="007"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers.</B>
  </DIV>
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->3<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant is incorporated under the laws of the State of Delaware. Section&nbsp;145 of the
  Delaware General Corporation Law provides that a corporation may indemnify any persons who were,
  are or are threatened to be made, parties to any threatened, pending or completed action, suit or
  proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
  the right of such corporation), by reason of the fact that such person is or was an officer,
  director, employee or agent of such corporation, or is or was serving at the request of such
  corporation as a director, officer, employee or agent of another corporation, partnership, joint
  venture, trust or other enterprise. The indemnity may include expenses (including attorneys&#146;
  fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such
  person in connection with such action, suit or proceeding, provided such person acted in good faith
  and in a manner he or she reasonably believed to be in or not opposed to the corporation&#146;s best
  interests and, with respect to any criminal action or proceeding, had no reasonable cause to
  believe that his or her conduct was unlawful.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law further authorizes a corporation to
  purchase and maintain insurance on behalf of any person who is or was a director, officer, employee
  or agent of the corporation, or is or was serving at the request of the corporation as a director,
  officer, employee or agent of another corporation or enterprise, against any liability asserted
  against him or her and incurred by him or her in any such capacity, arising out of his or her
  status as such, whether or not the corporation would otherwise have the power to indemnify him or
  her under Section&nbsp;145 of the Delaware General Corporation Law.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in
  its certificate of incorporation a provision eliminating or limiting the personal liability of a
  director to the corporation or its stockholders for monetary damages for breach of fiduciary duty
  as a director, provided that such provision shall not eliminate or limit the liability of a
  director: for any breach of the director&#146;s duty of loyalty to the corporation or its stockholders;
  for acts or omissions not in good faith or which involve intentional misconduct or a knowing
  violation of law; for payment of dividends or stock purchases or redemptions by the corporation in
  violation of Section&nbsp;174 of the Delaware General Corporation Law; or for any transaction from which
  the director derived an improper personal benefit.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s certificate of incorporation limits the personal liability of a director of
  the Registrant for breach of fiduciary duty as a director to the maximum extent permitted by the
  Delaware General Corporation Law. The Registrant&#146;s certificate of incorporation provides that no
  director will have personal liability to the Registrant or to stockholders of the Registrant for
  monetary damages for any such breach of fiduciary duty as a director. However, these provisions do
  not eliminate or limit the liability of any of the directors or officers of the Registrant for:
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" style="background: transparent">&nbsp;</TD>
      <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
      <TD width="1%">&nbsp;</TD>
      <TD>any breach of the director&#146;s duty of loyalty to the Registrant or stockholders of the Registrant;</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" style="background: transparent">&nbsp;</TD>
      <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
      <TD width="1%">&nbsp;</TD>
      <TD>any act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" style="background: transparent">&nbsp;</TD>
      <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
      <TD width="1%">&nbsp;</TD>
      <TD>any unlawful payments related to dividends or unlawful stock repurchases, redemptions or other distributions; or</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV style="margin-top: 6pt">
  <TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
  
  <TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
      <TD width="1%" style="background: transparent">&nbsp;</TD>
      <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
      <TD width="1%">&nbsp;</TD>
      <TD>any transaction from which the director or officer derived an improper personal benefit.</TD>
  </TR>
  
  </TABLE>
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These limitations of liability do not alter director liability under the federal securities
  laws and do not affect the availability of equitable remedies such as an injunction or rescission.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s certificate of incorporation and by-laws provide for indemnification of
  directors and officers by the Registrant to the fullest extent permitted by Delaware law and
  provide that the Registrant will advance expenses, including attorney&#146;s fees, to the directors and
  officers of the Registrant in connection with legal proceedings, subject to very limited
  exceptions.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition to the indemnification provisions of the Registrant&#146;s certificate of incorporation
  and by-laws, the Registrant has entered into indemnification agreements with each of the directors
  and executive officers of the Registrant. These agreements provide that the Registrant will
  indemnify each of its directors and executive officers to the fullest extent permitted by law and
  advance expenses to each indemnitee in connection with any proceeding in which indemnification is
  available.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant also maintains general liability insurance which covers certain liabilities of
  the directors and officers of the Registrant arising out of claims based on acts or omissions in
  their capacities as directors and officers, including
  </DIV>
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->4<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">liabilities under the 1933 Act. Insofar as
  indemnification for liabilities arising under the 1933 Act may be permitted to
  directors, officers or persons controlling the Registrant pursuant to the foregoing
  provisions, the Registrant has been informed that in the opinion of the Commission such
  indemnification is against public policy as expressed in the 1933 Act and is therefore
  unenforceable.
  </DIV>
  <!-- link2 "Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed." -->
  <DIV align="left"><A NAME="008"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed.</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable.
  </DIV>
  <!-- link2 "Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits." -->
  <DIV align="left"><A NAME="009"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits.</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents are filed as exhibits to this Registration Statement:
  </DIV>
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="10%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD>
      <TD width="88%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left"><B> Exhibit</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="LEFT" style="border-bottom: 1px solid #000000"><B>Description of Document</B></TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Amended and Restated Certificate of Incorporation (incorporated by
  reference to Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Amended and Restated By-laws (incorporated by reference to Exhibit&nbsp;3.4 to
  the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
  333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Specimen Stock Certificate (incorporated by reference to Exhibit&nbsp;4.1 to
  the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
  333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
  by reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.5
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
  by reference to Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.6
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
  by reference to Exhibit&nbsp;10.4 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Opinion of Winston &#038; Strawn LLP.</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of Deloitte &#038; Touche LLP.</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of Winston &#038; Strawn LLP (included in opinion filed as Exhibit&nbsp;5.1).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Powers of Attorney (included on signature page).</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  <!-- link2 "Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings." -->
  <DIV align="left"><A NAME="010"></A></DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings.</B>
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">(a)&nbsp;The undersigned Registrant hereby undertakes:
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective
  amendment to this Registration Statement:
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  (i)&nbsp;To include any prospectus required by Section&nbsp;10(a)(3) of the 1933 Act;
  </DIV>
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date
  of the Registration Statement (or the most recent post-effective amendment thereof) which,
  individually or in the aggregate, represent a fundamental change in the information set
  forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease
  in volume of securities offered (if the total dollar value of securities offered would not
  exceed
  </DIV>
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->5<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">that which was registered) and any deviation from the low or high end of the
  estimated maximum offering range may be reflected in the form of prospectus filed with the
  Commission pursuant to Rule 424(b) if, in the aggregate, the
  changes in volume and price represent no more than a 20% change in the maximum
  aggregate offering price set forth in the &#147;Calculation of Registration Fee&#148; table in the
  effective Registration Statement; and
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not
  previously disclosed in the Registration Statement or any material change to such
  information in the Registration Statement.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Provided</I>, <I>however</I>, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information
  required to be included in a post-effective amendment by those paragraphs is contained in reports
  filed with or furnished to the Commission by the Registrant pursuant to Section&nbsp;13 or Section 15(d)
  of the 1934 Act.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;That, for the purpose of determining any liability under the 1933 Act, each
  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.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&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 this offering.
  </DIV>
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">(b)&nbsp;The Registrant hereby undertakes that, for purpose of determining any liability under the 1933
  Act, each filing of the Registrant&#146;s annual report pursuant to Section 13(a) or Section 15(d) of
  the Exchange Act that is incorporated by reference in the Registration Statement shall be deemed to
  be a new registration statement relating to the securities offered therein, and the offering of
  such securities at that time shall be deemed to be the initial bona fide offering thereof.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">(c)&nbsp;Insofar as indemnification for liabilities arising under the 1933 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 1933 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 such 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 1933 Act and will be governed by
  the final adjudication of such issue.
  </DIV>
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->6<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  
  
  <!-- link1 "SIGNATURES" -->
  <DIV align="left"><A NAME="011"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
  </DIV>
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it
  has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
  has duly caused this Registration Statement to be signed on its behalf by the undersigned,
  thereunto duly authorized, in Oxford, Massachusetts, on December&nbsp;18, 2006.
  </DIV>
  
  <TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
  <TR>
      <TD width="48%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="1%">&nbsp;</TD>
      <TD width="35%">&nbsp;</TD>
      <TD width="15%">&nbsp;</TD>
  </TR>
  <TR>
      <TD valign="top" align="left">&nbsp;</TD>
      <TD colspan="3" align="left"><B>IPG PHOTONICS CORPORATION</B><BR>
  &nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD valign="top">By:&nbsp;&nbsp;</TD>
      <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Valentin P. Gapontsev
  &nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD valign="top">Name:&nbsp;&nbsp;</TD>
      <TD align="left">Valentin P. Gapontsev&nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR><TR>
      <TD align="left">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD valign="top">Title:&nbsp;&nbsp;</TD>
      <TD align="left">Chief Executive Officer and Chairman of the Board&nbsp;</TD>
      <TD>&nbsp;</TD>
  </TR>
  <TR>
      <TD colspan="5">&nbsp;</TD>
  </TR>
  </TABLE>
  <!-- link1 "POWER OF ATTORNEY" -->
  <DIV align="left"><A NAME="012"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
  </DIV>
  
  
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>KNOW ALL MEN BY THESE PRESENTS</B>, that each person whose signature appears below constitutes and
  appoints Valentin P. Gapontsev as such person&#146;s true and lawful attorney-in-fact and agent, with
  full power of substitution and revocation, for such person and in such person&#146;s name, place and
  stead, in any and all capacities to sign any and all amendments (including post-effective
  amendments) to this Registration Statement, and to file the same with all exhibits thereto, and the
  other documents in connection therewith, and any registration statement relating to any offering
  made pursuant to this Registration Statement that is to be effective upon filing pursuant to Rule
  462(b) under the 1933 Act with the Securities and Exchange Commission, granting unto said
  attorney-in-fact and agent full power and authority to do and perform each and every act and things
  requisite and necessary to be done, as fully to all intents and purposes as such person might or
  could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or
  his substitute, may lawfully do or cause to be done by virtue hereof.
  </DIV>
  
  <DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the 1933 Act, the registrant has duly caused this registration
  statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Oxford,
  Massachusetts, on December&nbsp;18, 2006.
  </DIV>
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="35%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="25%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Valentin P. Gapontsev
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Valentin P. Gapontsev
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Chief Executive Officer,<BR>
  Chairman of the Board and Director<BR>
  (Principal Executive Officer)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Timothy P.V. Mammen
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Timothy P.V. Mammen
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Chief Financial Officer<BR>
  (Principal Financial Officer and<BR>
  Principal Accounting Officer)
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Robert A. Blair
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Robert A. Blair
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Michael C. Child
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Michael C. Child
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John H. Dalton
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  John H. Dalton
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Henry E. Gauthier
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Henry E. Gauthier
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ William S. Hurley
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  William S. Hurley
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->7<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  
  <TR valign="bottom">
      <TD width="30%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="35%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="25%">&nbsp;</TD>
  </TR>
  <!-- Begin Table Body -->
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ William F. Krupke
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  William F. Krupke
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Eugene Shcherbakov
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Eugene Shcherbakov
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Igor Samartsev
  <DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
  Igor Samartsev
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">Director
  </TD>
      <TD>&nbsp;</TD>
      <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->8<!-- /Folio -->
  </DIV>
  
  <!-- PAGEBREAK -->
  <P><HR noshade><P>
  <H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
  
  <DIV style="font-family: 'Times New Roman',Times,serif">
  
  <!-- link1 "EXHIBIT INDEX" -->
  <DIV align="left"><A NAME="013"></A></DIV>
  
  <DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
  </DIV>
  
  <DIV align="center">
  <TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
  <!-- Begin Table Head -->
  <TR valign="bottom">
      <TD width="10%">&nbsp;</TD>
      <TD width="2%">&nbsp;</TD>
      <TD width="88%">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left"><B> Exhibit</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="center">&nbsp;</TD>
  </TR>
  <TR style="font-size: 10pt" valign="bottom">
      <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
      <TD>&nbsp;</TD>
      <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Description of Document</B></TD>
  </TR>
  
  <!-- End Table Head -->
  <!-- Begin Table Body -->
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Amended and Restated Certificate of Incorporation (incorporated by
  reference to Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Amended and Restated By-laws (incorporated by reference to Exhibit&nbsp;3.4 to
  the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
  333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Specimen Stock Certificate (incorporated by reference to Exhibit&nbsp;4.1 to
  the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
  333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
  by reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.5
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
  by reference to Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.6
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
  by reference to Exhibit&nbsp;10.4 to the Registrant&#146;s Registration Statement on
  Form&nbsp;S-1, file number 333-136521).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Opinion of Winston &#038; Strawn LLP.</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of Deloitte &#038; Touche LLP.</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Consent of Winston &#038; Strawn LLP (included in opinion filed as Exhibit&nbsp;5.1).</TD>
  </TR>
  <TR valign="bottom"><!-- Blank Space -->
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
      <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
  </DIV></TD>
      <TD>&nbsp;</TD>
      <TD align="left" valign="top">Powers of Attorney (included on signature page).</TD>
  </TR>
  <!-- End Table Body -->
  </TABLE>
  </DIV>
  
  
  
  <P align="center" style="font-size: 10pt"><!-- Folio -->9<!-- /Folio -->
  </DIV>
  
  </BODY>
  </HTML>
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metadata_filer: {"company-data": {"conformed-name": "IPG PHOTONICS CORP", "cik": "0001111928", "assigned-sic": "3674", "irs-number": "043444218", "state-of-incorporation": "DE"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-139509", "film-number": "061289098"}, "business-address": {"street1": "50 OLD WEBSTER ROAD", "city": "OXFORD", "state": "MA", "zip": "01540", "phone": "5083731100"}, "mail-address": {"street1": "50 OLD WEBSTER ROAD", "city": "OXFORD", "state": "MA", "zip": "01540"}}
text: sv8
  Table of Contents
  As
  filed with the Securities and Exchange Commission on December 20, 2006
  UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  Washington, D.C. 20549
  FORM S-8
  REGISTRATION STATEMENT
  UNDER
  THE SECURITIES ACT OF 1933
  IPG PHOTONICS CORPORATION
  (Exact Name of registrant as specified in its charter)
  Delaware
  (State or other jurisdiction of
  incorporation or organization)
  3674
  (Primary Standard Industrial
  Classification Code Number)
  04-3444218
  (I.R.S. Employer Identification Number)
  IPG Photonics Corporation Non-Employee Directors Stock Plan
  IPG Photonics Corporation 2000 Incentive Compensation Plan
  IPG Photonics Corporation 2006 Incentive Compensation Plan
  (Full title of the plans)
  50 Old Webster Road
  Oxford, Massachusetts 01540
  (508) 373-1100
  (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)
  Valentin P. Gapontsev, Ph.D.
  Chief Executive Officer and Chairman of the Board
  IPG Photonics Corporation
  50 Old Webster Road
  Oxford, Massachusetts 01540
  (508) 373-1100
  (Name, address, including zip code, and telephone number, including area code, of agent for service)
  Copy To:
  Robert W. Ericson, Esq.
  David A. Sakowitz, Esq.
  Winston & Strawn LLP
  200 Park Avenue
  New York, New York 10166-4193
  (212) 294-6700
  Table of Contents
  CALCULATION OF REGISTRATION FEE
  Proposed
  Proposed
  Maximum
  Title of Each Class of
  Amount
  Maximum
  Aggregate
  Amount of
  Securities To
  To Be
  Offering Price
  Offering
  Registration
  Be Registered
  Registered (1)
  Per Share (2)
  Price (2)
  Fee
  COMMON STOCK, $.0001 PAR VALUE PER SHARE, ISSUABLE PURSUANT TO:
  IPG Photonics Corporation Non-Employee Directors Stock Plan
  166,667 shares
  $
  24.30
  $
  4,050,000
  $
  433
  IPG Photonics Corporation 2000 Incentive Compensation Plan
  5,833,333 shares
  $
  24.30
  $
  141,750,000
  $
  15,167
  IPG Photonics Corporation 2006 Incentive Compensation Plan
  4,000,000 shares
  $
  24.30
  $
  97,200,000
  $
  10,401
  TOTAL
  10,000,000 shares
  $
  24.30
  $
  243,000,000
  $
  26,001
  (1)
  In accordance with Rule 416(a) under the Securities Act of 1933, as
  amended, this Registration Statement shall be deemed to cover any
  additional shares of the Registrant's common stock that become
  issuable under the IPG Photonics Corporation Non-Employee Directors
  Stock Plan, the IPG Photonics Corporation 2000 Incentive Compensation
  Plan or the IPG Photonics Corporation 2006 Incentive Compensation Plan
  as a result of a stock split, stock dividend or similar adjustment of
  the outstanding shares of common stock of IPG Photonics Corporation.
  (2)
  Estimated solely for the purpose of determining the registration fee
  and computed in accordance with Rule 457(c) and 457(h) of the
  Securities Act of 1933, as amended. Such computation is based on the
  average of the high and low prices as reported on The Nasdaq Global
  Market on December 18, 2006.
  2
  TABLE OF CONTENTS
  PART I
  INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
  PART II
  INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
  Item 3.    Incorporation of Documents by Reference.
  Item 4.    Description of Securities.
  Item 5.    Interests of Named Experts and Counsel.
  Item 6.    Indemnification of Directors and Officers.
  Item 7.    Exemption from Registration Claimed.
  Item 8.    Exhibits.
  Item 9.    Undertakings.
  SIGNATURES
  POWER OF ATTORNEY
  EXHIBIT INDEX
  EX-5.1 OPINION OF WINSTON & STRAWN LLP
  EX-23.1 CONSENT OF DELOITTE & TOUCHE LLP
  Table of Contents
  PART I
  INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
  IPG Photonics Corporation, a Delaware corporation (the "Registrant"), shall deliver the
  document containing the information in Part I of this Registration Statement on Form S-8 to each
  participant in the IPG Photonics Corporation Non-Employee Directors Stock Plan, the IPG Photonics
  Corporation 2000 Incentive Compensation Plan and the IPG Photonics Corporation 2006 Incentive
  Compensation Plan as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the
  "1933 Act"). Such document is not being filed with or included in this Registration Statement (by
  incorporation by reference or otherwise) in accordance with the rules and regulations of the
  Securities and Exchange Commission (the "Commission"). Such document and the documents
  incorporated by reference into this Registration Statement pursuant to Item 3 of Part II of this
  Registration Statement, taken together, constitute a prospectus that meets the requirements of
  Section 10(a) of the 1933 Act.
  PART II
  INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
  Item 3.    Incorporation of Documents by Reference.
  The following documents filed by the Registrant with the Commission are incorporated by
  reference in this Registration Statement:
  (a) the Registrant's Prospectus filed pursuant to Rule 424(b) under the 1933 Act
  relating to the Registrant's Registration Statement on Form S-1, as amended (Registration
  No. 333-136521); and
  (b) the description of the Registrant's common stock, par value $0.0001 per share,
  contained in its Registration Statement on Form 8-A/A, filed on
  December 7, 2006 pursuant to
  Section 12(b) of the Securities Exchange Act of 1934, as amended (the "1934 Act"), including
  any amendment or report filed for the purpose of updating such description.
  All documents subsequently filed with the Commission by the Registrant pursuant to Sections
  13(a), 13(c), 14 or 15(d) of the 1934 Act prior to the filing of a post-effective amendment, which
  indicates that all securities offered herein have been sold or which deregisters all securities
  then remaining unsold, shall be deemed to be incorporated by reference herein and to be part hereof
  from the respective dates of filing of such documents. Any statement contained herein or in a
  document incorporated or deemed to be incorporated by reference herein shall be deemed to be
  modified or superseded for purposes hereof or for purposes of the related prospectus to the extent
  that a statement contained herein or in any other subsequently filed document which is also
  incorporated or deemed to be incorporated herein modifies or supersedes such statement. Any such
  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.
  None.
  Item 6.    Indemnification of Directors and Officers.
  3
  Table of Contents
  The Registrant is incorporated under the laws of the State of Delaware. Section 145 of the
  Delaware General Corporation Law provides that a corporation may indemnify any persons who were,
  are or are threatened to be made, parties to any threatened, pending or completed action, suit or
  proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
  the right of such corporation), by reason of the fact that such person is or was an officer,
  director, employee or agent of such corporation, or is or was serving at the request of such
  corporation as a director, officer, employee or agent of another corporation, partnership, joint
  venture, trust or other enterprise. The indemnity may include expenses (including attorneys'
  fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such
  person in connection with such action, suit or proceeding, provided such person acted in good faith
  and in a manner he or she reasonably believed to be in or not opposed to the corporation's best
  interests and, with respect to any criminal action or proceeding, had no reasonable cause to
  believe that his or her conduct was unlawful.
  Section 145 of the Delaware General Corporation Law further authorizes a corporation to
  purchase and maintain insurance on behalf of any person who is or was a director, officer, employee
  or agent of the corporation, or is or was serving at the request of the corporation as a director,
  officer, employee or agent of another corporation or enterprise, against any liability asserted
  against him or her and incurred by him or her in any such capacity, arising out of his or her
  status as such, whether or not the corporation would otherwise have the power to indemnify him or
  her under Section 145 of the Delaware General Corporation Law.
  Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in
  its certificate of incorporation a provision eliminating or limiting the personal liability of a
  director to the corporation or its stockholders for monetary damages for breach of fiduciary duty
  as a director, provided that such provision shall not eliminate or limit the liability of a
  director: for any breach of the director's duty of loyalty to the corporation or its stockholders;
  for acts or omissions not in good faith or which involve intentional misconduct or a knowing
  violation of law; for payment of dividends or stock purchases or redemptions by the corporation in
  violation of Section 174 of the Delaware General Corporation Law; or for any transaction from which
  the director derived an improper personal benefit.
  The Registrant's certificate of incorporation limits the personal liability of a director of
  the Registrant for breach of fiduciary duty as a director to the maximum extent permitted by the
  Delaware General Corporation Law. The Registrant's certificate of incorporation provides that no
  director will have personal liability to the Registrant or to stockholders of the Registrant for
  monetary damages for any such breach of fiduciary duty as a director. However, these provisions do
  not eliminate or limit the liability of any of the directors or officers of the Registrant for:
  •
  any breach of the director's duty of loyalty to the Registrant or stockholders of the Registrant;
  •
  any act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;
  •
  any unlawful payments related to dividends or unlawful stock repurchases, redemptions or other distributions; or
  •
  any transaction from which the director or officer derived an improper personal benefit.
  These limitations of liability do not alter director liability under the federal securities
  laws and do not affect the availability of equitable remedies such as an injunction or rescission.
  The Registrant's certificate of incorporation and by-laws provide for indemnification of
  directors and officers by the Registrant to the fullest extent permitted by Delaware law and
  provide that the Registrant will advance expenses, including attorney's fees, to the directors and
  officers of the Registrant in connection with legal proceedings, subject to very limited
  exceptions.
  In addition to the indemnification provisions of the Registrant's certificate of incorporation
  and by-laws, the Registrant has entered into indemnification agreements with each of the directors
  and executive officers of the Registrant. These agreements provide that the Registrant will
  indemnify each of its directors and executive officers to the fullest extent permitted by law and
  advance expenses to each indemnitee in connection with any proceeding in which indemnification is
  available.
  The Registrant also maintains general liability insurance which covers certain liabilities of
  the directors and officers of the Registrant arising out of claims based on acts or omissions in
  their capacities as directors and officers, including
  4
  Table of Contents
  liabilities under the 1933 Act. Insofar as
  indemnification for liabilities arising under the 1933 Act may be permitted to
  directors, officers or persons controlling the Registrant pursuant to the foregoing
  provisions, the Registrant has been informed that in the opinion of the Commission such
  indemnification is against public policy as expressed in the 1933 Act and is therefore
  unenforceable.
  Item 7.    Exemption from Registration Claimed.
  Not Applicable.
  Item 8.    Exhibits.
  The following documents are filed as exhibits to this Registration Statement:
  Exhibit
  Number
  Description of Document
  4.1
  Amended and Restated Certificate of Incorporation (incorporated by
  reference to Exhibit 3.2 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.2
  Amended and Restated By-laws (incorporated by reference to Exhibit 3.4 to
  the Registrant's Registration Statement on Form S-1, file number
  333-136521).
  4.3
  Specimen Stock Certificate (incorporated by reference to Exhibit 4.1 to
  the Registrant's Registration Statement on Form S-1, file number
  333-136521).
  4.4
  IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
  by reference to Exhibit 10.1 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.5
  IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
  by reference to Exhibit 10.2 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.6
  IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
  by reference to Exhibit 10.4 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  5.1
  Opinion of Winston & Strawn LLP.
  23.1
  Consent of Deloitte & Touche LLP.
  23.2
  Consent of Winston & Strawn LLP (included in opinion filed as Exhibit 5.1).
  24.1
  Powers of Attorney (included on signature page).
  Item 9.    Undertakings.
  (a) The undersigned Registrant hereby undertakes:
  (1) To file, during any period in which offers or sales are being made, a post-effective
  amendment to this Registration Statement:
  (i) To include any prospectus required by Section 10(a)(3) of the 1933 Act;
  (ii) To reflect in the prospectus any facts or events arising after the effective date
  of the Registration Statement (or the most recent post-effective amendment thereof) which,
  individually or in the aggregate, represent a fundamental change in the information set
  forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease
  in volume of securities offered (if the total dollar value of securities offered would not
  exceed
  5
  Table of Contents
  that which was registered) and any deviation from the low or high end of the
  estimated maximum offering range may be reflected in the form of prospectus filed with the
  Commission pursuant to Rule 424(b) if, in the aggregate, the
  changes in volume and price represent no more than a 20% change in the maximum
  aggregate offering price set forth in the "Calculation of Registration Fee" table in the
  effective Registration Statement; and
  (iii) To include any material information with respect to the plan of distribution not
  previously disclosed in the Registration Statement or any material change to such
  information in the Registration Statement.
  Provided
  ,
  however
  , that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information
  required to be included in a post-effective amendment by those paragraphs is contained in reports
  filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d)
  of the 1934 Act.
  (2) That, for the purpose of determining any liability under the 1933 Act, each
  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.
  (3) To remove from registration by means of a post-effective amendment any of the securities
  being registered which remain unsold at the termination of this offering.
  (b) The Registrant hereby undertakes that, for purpose of determining any liability under the 1933
  Act, each filing of the Registrant's annual report pursuant to Section 13(a) or Section 15(d) of
  the Exchange Act that is incorporated by reference in the Registration Statement shall be deemed to
  be a new registration statement relating to the securities offered therein, and the offering of
  such securities at that time shall be deemed to be the initial bona fide offering thereof.
  (c) Insofar as indemnification for liabilities arising under the 1933 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 1933 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 such 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 1933 Act and will be governed by
  the final adjudication of such issue.
  6
  Table of Contents
  SIGNATURES
  Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it
  has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
  has duly caused this Registration Statement to be signed on its behalf by the undersigned,
  thereunto duly authorized, in Oxford, Massachusetts, on December 18, 2006.
  IPG PHOTONICS CORPORATION
  By:
  /s/ Valentin P. Gapontsev
  Name:
  Valentin P. Gapontsev
  Title:
  Chief Executive Officer and Chairman of the Board
  POWER OF ATTORNEY
  KNOW ALL MEN BY THESE PRESENTS
  , that each person whose signature appears below constitutes and
  appoints Valentin P. Gapontsev as such person's true and lawful attorney-in-fact and agent, with
  full power of substitution and revocation, for such person and in such person's name, place and
  stead, in any and all capacities to sign any and all amendments (including post-effective
  amendments) to this Registration Statement, and to file the same with all exhibits thereto, and the
  other documents in connection therewith, and any registration statement relating to any offering
  made pursuant to this Registration Statement that is to be effective upon filing pursuant to Rule
  462(b) under the 1933 Act with the Securities and Exchange Commission, granting unto said
  attorney-in-fact and agent full power and authority to do and perform each and every act and things
  requisite and necessary to be done, as fully to all intents and purposes as such person might or
  could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or
  his substitute, may lawfully do or cause to be done by virtue hereof.
  Pursuant to the requirements of the 1933 Act, the registrant has duly caused this registration
  statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Oxford,
  Massachusetts, on December 18, 2006.
  Signature
  Title
  Date
  /s/ Valentin P. Gapontsev
  Valentin P. Gapontsev
  Chief Executive Officer,
  Chairman of the Board and Director
  (Principal Executive Officer)
  December  18, 2006
  /s/ Timothy P.V. Mammen
  Timothy P.V. Mammen
  Chief Financial Officer
  (Principal Financial Officer and
  Principal Accounting Officer)
  December  18, 2006
  /s/ Robert A. Blair
  Robert A. Blair
  Director
  December  18, 2006
  /s/ Michael C. Child
  Michael C. Child
  Director
  December  18, 2006
  /s/ John H. Dalton
  John H. Dalton
  Director
  December  18, 2006
  /s/ Henry E. Gauthier
  Henry E. Gauthier
  Director
  December  18, 2006
  /s/ William S. Hurley
  William S. Hurley
  Director
  December  18, 2006
  7
  Table of Contents
  /s/ William F. Krupke
  William F. Krupke
  Director
  December  18, 2006
  /s/ Eugene Shcherbakov
  Eugene Shcherbakov
  Director
  December  18, 2006
  /s/ Igor Samartsev
  Igor Samartsev
  Director
  December  18, 2006
  8
  Table of Contents
  EXHIBIT INDEX
  Exhibit
  Number
  Description of Document
  4.1
  Amended and Restated Certificate of Incorporation (incorporated by
  reference to Exhibit 3.2 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.2
  Amended and Restated By-laws (incorporated by reference to Exhibit 3.4 to
  the Registrant's Registration Statement on Form S-1, file number
  333-136521).
  4.3
  Specimen Stock Certificate (incorporated by reference to Exhibit 4.1 to
  the Registrant's Registration Statement on Form S-1, file number
  333-136521).
  4.4
  IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
  by reference to Exhibit 10.1 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.5
  IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
  by reference to Exhibit 10.2 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  4.6
  IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
  by reference to Exhibit 10.4 to the Registrant's Registration Statement on
  Form S-1, file number 333-136521).
  5.1
  Opinion of Winston & Strawn LLP.
  23.1
  Consent of Deloitte & Touche LLP.
  23.2
  Consent of Winston & Strawn LLP (included in opinion filed as Exhibit 5.1).
  24.1
  Powers of Attorney (included on signature page).
  9