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<DIV align="center" style="font-size: 10pt; margin-top: 3pt"><B>As filed with the Securities and Exchange Commission on June&nbsp;8, 2010</B>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 3pt"><B>Registration No.&nbsp;333-</B><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt; margin-top: 3pt">&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" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></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: 12pt"><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV></B>
</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">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>04-3444218</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or other jurisdiction of
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Identification No.)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>50 Old Webster Road<BR>
Oxford, Massachusetts 01540</B><BR>
(Address of Principal Executive Offices) (Zip Code)
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>IPG Photonics Corporation Non-Employee Directors Stock Plan<BR>
(</B>Full title of the plan<B>)</B>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><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, and telephone number of agent for service)
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B><I>with a copy to:</I></B>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><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" style="font-size: 10pt; margin-top: 6pt"><DIV align="center"><DIV style="FONT-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a
non-accelerated filer, or a smaller reporting company. See the definitions of &#147;large accelerated
filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule&nbsp;12b-2 of the Exchange Act.
</DIV>



<TABLE width="100%" style="FONT-size: 10pt; margin-top: 0pt">
<TR>
<TD>Large accelerated filer&nbsp;<FONT style="font-family: Wingdings">&#111;</FONT></TD>
<TD align="center">Accelerated filer&nbsp;<FONT style="font-family: Wingdings">&#254;</FONT>&nbsp;</TD>
<TD align="center"><br>Non-accelerated filer&nbsp;<FONT style="font-family: Wingdings">&#111;</FONT><BR>(Do not check if a smaller reporting company)</TD>
<TD align="right">Smaller reporting company&nbsp;<FONT style="font-family: Wingdings">&#111;</FONT></TD>
</TR>
</TABLE>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><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" style="font-size: 1pt">
    <TD width="1%">&nbsp;</TD>
    <TD width="54%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&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: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>Title of securities</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Amount to</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>offering price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>aggregate</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Amount of</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center"><B>to be registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>be registered(1)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>per share(2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>offering price(2)</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>registration fee</B></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px"><B>Common Stock, par
value $0.0001,
issuable pursuant to
IPG Photonics
Corporation
Non-Employee Directors
Stock Plan</B></DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="center" style="border-top: 2px solid #000000" nowrap><B>320,000 shares</B></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>$</B></TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>16.51</B></TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>$</B></TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>5,283,200</B></TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>$</B></TD>
    <TD align="right" style="border-top: 2px solid #000000"><B>376.69</B></TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px 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>Pursuant to Rule&nbsp;416 under the Securities Act of 1933, as amended (the &#147;Securities
Act&#148;), 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, as amended, 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. Pursuant to
Rules 457(c) and 457(h)(1) under the Securities Act, based on the average of the high and
low prices on June&nbsp;4, 2010, as reported by the NASDAQ Global Market.</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 -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">












<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXPLANATORY NOTE</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to General Instruction E of Form S-8, this Registration Statement registers an
additional 320,000 shares of common stock of IPG Photonics Corporation, a Delaware corporation (the
&#147;Registrant&#148;), that may be issued under the Registrant&#146;s IPG Photonics Corporation Non-Employee
Directors Stock Plan, as amended (the &#147;Plan&#148;).
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><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;The Registrant shall deliver the document containing the information in Part&nbsp;I of this
Registration Statement on Form S-8 to each participant in the Plan, as specified by Rule&nbsp;428(b)(1)
under the Securities 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. 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 Securities Act.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The contents of the Registration Statement on Form S-8 filed by the Registrant on December&nbsp;20,
2006 (Registration Statement No.&nbsp;333-139509) are incorporated by reference into this Registration
Statement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</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="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR></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">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
filed on December&nbsp;20, 2006 (File No.&nbsp;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">Amendment to the IPG Photonics Corporation Non-Employee Directors Stock
Plan (incorporated by reference to Exhibit&nbsp;A to the Registrant&#146;s definitive proxy
statement on Schedule&nbsp;14A filed on April&nbsp;15, 2010 (File No.&nbsp;001-33155)).</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 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">Power of Attorney (included on signature page of the Registration Statement).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith</TD>
</TR>

</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<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;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 this 8th day of June, 2010.
</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>

<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;<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 Securities 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;Pursuant
to the requirements of the Securities 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 June&nbsp;8, 2010.
</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="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="55%">&nbsp;</TD>
</TR>
<TR></TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Valentin P. Gapontsev
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Valentin P. Gapontsev</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Executive Officer,<br>
Chairman of the Board and Director<br>
(Principal Executive Officer)</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Timothy P.V. Mammen
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Timothy P.V. Mammen</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial Officer<br>
(Principal Financial and Accounting Officer)</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Robert A. Blair
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Robert A. Blair</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Michael C. Child
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Michael C. Child</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ John H. Dalton
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>John H. Dalton</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Henry E. Gauthier</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ William S. Hurley
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>William S. Hurley</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ William F. Krupke
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>William F. Krupke</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Igor Samartsev<BR>
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Igor Samartsev</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</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="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Eugene Shcherbakov<BR>
<DIV style="width: 100%; border-bottom: 1px solid #000000; FONT-size: 1px">&nbsp;</DIV>
<B>Eugene Shcherbakov</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</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">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>INDEX TO EXHIBITS</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="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="92%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left"><B>Exhibit No.</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Description</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">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
filed on December&nbsp;20, 2006 (File No.&nbsp;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">Amendment to the IPG Photonics Corporation Non-Employee Directors Stock
Plan (incorporated by reference to Exhibit&nbsp;A to the Registrant&#146;s definitive proxy
statement on Schedule&nbsp;14A filed on April&nbsp;15, 2010 (File No.&nbsp;001-33155)).</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 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">Power of Attorney (included on signature page of the Registration Statement).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith</TD>
</TR>

</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

</BODY>
</HTML>
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sv8
As filed with the Securities and Exchange Commission on June 8, 2010
Registration No. 333-
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
04-3444218
(State or other jurisdiction of
(I.R.S. Employer
incorporation or organization)
Identification No.)
50 Old Webster Road
Oxford, Massachusetts 01540
(Address of Principal Executive Offices) (Zip Code)
IPG Photonics Corporation Non-Employee Directors Stock Plan
(
Full title of the plan
)
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, and telephone number of agent for service)
with a 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
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a
non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated
filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
o
Accelerated filer
þ
Non-accelerated filer
o
(Do not check if a smaller reporting company)
Smaller reporting company
o
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
maximum
maximum
Title of securities
Amount to
offering price
aggregate
Amount of
to be registered
be registered(1)
per share(2)
offering price(2)
registration fee
Common Stock, par
value $0.0001,
issuable pursuant to
IPG Photonics
Corporation
Non-Employee Directors
Stock Plan
320,000 shares
$
16.51
$
5,283,200
$
376.69
(1)
Pursuant to Rule 416 under the Securities Act of 1933, as amended (the "Securities
Act"), 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, as amended, 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. Pursuant to
Rules 457(c) and 457(h)(1) under the Securities Act, based on the average of the high and
low prices on June 4, 2010, as reported by the NASDAQ Global Market.
EXPLANATORY NOTE
Pursuant to General Instruction E of Form S-8, this Registration Statement registers an
additional 320,000 shares of common stock of IPG Photonics Corporation, a Delaware corporation (the
"Registrant"), that may be issued under the Registrant's IPG Photonics Corporation Non-Employee
Directors Stock Plan, as amended (the "Plan").
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
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 Plan, as specified by Rule 428(b)(1)
under the Securities 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. 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 Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The contents of the Registration Statement on Form S-8 filed by the Registrant on December 20,
2006 (Registration Statement No. 333-139509) are incorporated by reference into this Registration
Statement.
Item 8. Exhibits.
4.1
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
filed on December 20, 2006 (File No. 333-136521)).
4.2
Amendment to the IPG Photonics Corporation Non-Employee Directors Stock
Plan (incorporated by reference to Exhibit A to the Registrant's definitive proxy
statement on Schedule 14A filed on April 15, 2010 (File No. 001-33155)).
5.1*
Opinion of Winston & Strawn LLP.
23.1*
Consent of Deloitte & Touche LLP.
23.2*
Consent of Winston & Strawn LLP (included in Exhibit 5.1).
24.1*
Power of Attorney (included on signature page of the Registration Statement).
*
Filed herewith
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 this 8th day of June, 2010.
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 Securities 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 Securities 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 June 8, 2010.
By
/s/ Valentin P. Gapontsev
Valentin P. Gapontsev
Chief Executive Officer,
Chairman of the Board and Director
(Principal Executive Officer)
By
/s/ Timothy P.V. Mammen
Timothy P.V. Mammen
Chief Financial Officer
(Principal Financial and Accounting Officer)
By
/s/ Robert A. Blair
Robert A. Blair
Director
By
/s/ Michael C. Child
Michael C. Child
Director
By
/s/ John H. Dalton
John H. Dalton
Director
By
Henry E. Gauthier
Director
By
/s/ William S. Hurley
William S. Hurley
Director
By
/s/ William F. Krupke
William F. Krupke
Director
By
/s/ Igor Samartsev
Igor Samartsev
Director
By
/s/ Eugene Shcherbakov
Eugene Shcherbakov
Director
INDEX TO EXHIBITS
Exhibit No.
Description
4.1
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
filed on December 20, 2006 (File No. 333-136521)).
4.2
Amendment to the IPG Photonics Corporation Non-Employee Directors Stock
Plan (incorporated by reference to Exhibit A to the Registrant's definitive proxy
statement on Schedule 14A filed on April 15, 2010 (File No. 001-33155)).
5.1*
Opinion of Winston & Strawn LLP.
23.1*
Consent of Deloitte & Touche LLP.
23.2*
Consent of Winston & Strawn LLP (included in Exhibit 5.1).
24.1*
Power of Attorney (included on signature page of the Registration Statement).
*
Filed herewith