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    <td align="center"><font face=serif size=2
     >As filed with the Securities and Exchange Commission on June 19,
    2006</font></td>
  </tr>
  <tr>
    <td align="right"><font face=serif size=2
     >Registration No. 333-</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </td>
  </tr>
</table>
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<hr size="1" noshade color="#000000" style="margin-top: -10px">

<p align="center"><b><font face=serif>  UNITED
      STATES</font></b><br>
      <b><font face=serif>SECURITIES AND
      EXCHANGE COMMISSION</font></b><br>
<font face=serif size=2
     >Washington, D.C. 20549</font></p>
<hr align=center width=15% size=1 noshade color="#000000">

<P align=center><b><font face=serif>FORM
      S-8</font></b><br>
      <b><font face=serif>REGISTRATION
      STATEMENT</font></b><br>
      <i><font face=serif size=2
     >Under</font></i><br>
      <i><font face=serif size=2
     >The Securities Act of
        1933</font></i>
<hr align=center width=15% size=1 noshade color="#000000">
</P>
<br>
<TABLE width="90%" border=0 align=center cellPadding=0 cellSpacing=0
BCLEMPTYCOL>

  <TR vAlign=bottom>
    <TD align=center width="99%" colSpan=5><B><FONT
      face=serif>ULTRA CLEAN HOLDINGS,
      INC.</FONT></B> </TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="99%" colSpan=5><FONT face=serif
      size=1>(Exact name of registrant as
      specified in its charter)</FONT> </TD>
  </TR>
  <TR>
    <TD width="99%" colSpan=5 align="center">&nbsp; </TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="25%"><B><FONT face=serif size=2
     >Delaware</FONT></B></TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="44%">&nbsp; </TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="26%"><B><FONT face=serif size=2
     >61-1430858</FONT></B></TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="25%"><FONT face=serif size=1
     >(State or other jurisdiction</FONT></TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="44%">&nbsp; </TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="26%"><FONT face=serif size=1
     >(IRS Employer Identification
      No.)</FONT></TD>
  </TR>
  <TR vAlign=bottom>
    <TD width="25%" align=center valign="top"><FONT face=serif size=1
     >of incorporation or
      organization)</FONT></TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="44%">&nbsp; </TD>
    <TD width="2%" align="center">&nbsp; </TD>
    <TD align=center width="26%">&nbsp; </TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="99%" colSpan=5><B><FONT
      face=serif size=2>150
      INDEPENDENCE DRIVE</FONT></B> </TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="99%" colSpan=5><B><FONT
      face=serif size=2>MENLO PARK,
      CA 94025</FONT></B> </TD>
  </TR>
  <TR vAlign=bottom>
    <TD align=center width="99%" colSpan=5><FONT face=serif
      size=1>(Address of principal executive
offices) (Zip Code)</FONT> </TD>
  </TR></TABLE><BR>
  <hr align=center width=15% size=1 noshade color="#000000">
<P align=center><b><font face=serif size=2
     >ULTRA CLEAN HOLDINGS, INC. AMENDED AND RESTATED STOCK
      INCENTIVE PLAN</font></b><br>
      <font face=serif size=2
     >(Full title of the
Plan)
</font></P>
<hr align=center width=15% size=1 noshade color="#000000">
<div align="center"><b><font face=serif size=2
     ><br>
  INCORPORATING SERVICES, INC.</font></b><br>
    <b><font
      face=serif size=2>15 EAST NORTH
      STREET</font></b><br>
      <b><font face=serif size=2
     >DOVER, DE 19901</font></b><br>
      <b><font face=serif size=2
     >(800) 346-4646</font></b><br>
      <font face=serif size=1>(Name, address including
        zip code, and telephone number,</font><br>
      <font face=serif size=1>including area code, of agent for
service)</font></div>
<br>
<hr align=center width=15% size=1 noshade color="#000000">

<P align=center><i><font face=serif size=2
     >Copies to:</font></i><br>
  <font face=serif size=2
     >Alan F. Denenberg, Esq.</font><br>
  <font
      face=serif size=2>Davis Polk &amp;
    Wardwell</font><br>
      <font face=serif size=2
     >1600 El Camino Real</font><br>
      <font face=serif size=2
     >Menlo Park, California 94025</font><br>
      <font
      face=serif size=2>(650)
752-2000</font>
<hr align=center width=15% size=1 noshade color="#000000">
<P align=center><b><font face=serif size=2
     >CALCULATION OF REGISTRATION
  FEE</font></b>
<TABLE cellSpacing=2 cellPadding=2 width="100%" border=1
BCLEMPTYCOL>

  <TR vAlign=bottom>
    <TD width="20%" align=center nowrap><B><FONT face=serif size=1
     >Title of
      Securities<BR>
    to be
    Registered</FONT></B></TD>
    <TD width="20%" align=center nowrap><B><FONT face=serif size=1
     >Amount
      to be<BR>
    Registered (1)</FONT></B></TD>
    <TD width="20%" align=center nowrap><B><FONT
      face=serif size=1
     >Proposed<BR>
      Maximum
      Offering<BR>
      Price
    per Share (2)</FONT></B></TD>
    <TD width="20%" align=center nowrap><B><FONT
      face=serif size=1
     >Proposed
      Maximum<BR>
      Aggregate
      Offering<BR>
    Price (2)</FONT></B></TD>
    <TD width="20%" align=center nowrap><B><FONT face=serif size=1
     >Amount of<BR>
      Registration
    Fee</FONT></B></TD>
  </TR>
  <TR vAlign=bottom>
    <TD width="20%" align=left nowrap><FONT
      face=serif size=2>Common Stock, $0.001 par
      value</FONT><font size="2">&nbsp; </font></TD>
    <TD align=center width="20%"><FONT face=serif size=2
     >330,027 shares</FONT><font size="2">&nbsp; </font></TD>
    <TD align=center width="20%"><FONT face=serif size=2
     >$7.81</FONT><font size="2">&nbsp; </font></TD>
    <TD align=center width="20%"><FONT face=serif size=2
     >$2,577,511</FONT><font size="2">&nbsp; </font></TD>
<TD align=center width="20%"><FONT face=serif size=2
     >$276</FONT><font size="2">&nbsp; </font></TD></TR></TABLE>
<BR>
<TABLE cellSpacing=0 cellPadding=2 border=0>

  <TR valign="top">
    <TD width="5%" noWrap><FONT face=serif size=1
     >(1)</FONT></TD>
    <TD width="95%"><FONT face=serif size=1>
     This Registration Statement covers shares being added to
      the Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan.
      This Registration Statement shall also cover any additional shares of
      common stock which become issuable under the Ultra Clean Holdings,
      Inc. Amended and Restated Stock Incentive Plan by
      reason of any stock dividend, stock split, recapitalization or other
      similar transaction effected without Registrant&#146;s receipt of consideration
      which results in an increase in the number of the outstanding shares of
      Registrant&#146;s common stock.</FONT></TD></TR>
  <TR valign="top">
    <TD width="5%"><FONT size=1 face="serif">(2)</FONT></TD>
    <TD width="95%"><font size=1 face="serif">Calculated under Rule 457(h) of
        the Securities Act of 1933, as amended, on the basis of the average of
        the high and low selling prices per share of the Registrant&#146;s Common
        Stock on June 14,  2006 as reported by the NASDAQ National Market.</font></TD>
  </TR>
  <TR valign="top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
  </TR>
</TABLE>
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<hr size="4" noshade color="#000000" style="margin-top: -10px">
<page>
<br>
<P align="center">
<div align="center"><b><font size=2 face="serif">PART II</font></b><br>
    <b><font size=2 face="serif">Information Required in the Registration Statement</font></b></P>
</div>
<P align="left"><FONT size=2 face="serif">Item 3.&nbsp;&nbsp;&nbsp;&nbsp; <u>Incorporation
of Documents by Reference</u></FONT>
<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Ultra Clean Holdings, Inc. (the &#147;Registrant&#148;) hereby incorporates by reference into this Registration Statement the following documents previously filed
with the Securities and Exchange Commission (the &#147;SEC&#148;):</FONT></P>
<TABLE border=0 cellspacing=0 cellpadding=0>
<TR>
  <TD width="5%" valign=top>&nbsp;</TD>
	<TD width="5%" valign=top>
<FONT size=2 face="serif">(a)</FONT>&nbsp; &nbsp; &nbsp; 	</TD>
	<TD width=90%>
<FONT size=2 face="serif">The Corporation&#146;s Annual Report on Form 10-K for the fiscal year ended December 31, 2005, filed with the SEC on February 28, 2006, pursuant to Section 13 of the Securities Exchange Act of
1934, as amended (the &#147;1934 Act&#148;);</FONT>	</TD>
</TR>
<TR><TD colspan=3>&nbsp;</TD></TR><TR>
  <TD width="5%" valign=top>&nbsp;</TD>
	<TD width="5%" valign=top>
<FONT size=2 face="serif">(b)</FONT>&nbsp; &nbsp; &nbsp; 	</TD>
	<TD width=90%>
<FONT size=2 face="serif">The Corporation&#146;s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006, filed with the SEC on May 15, 2006, pursuant to Section 13 of the 1934 Act;</FONT>	</TD>
</TR>
<TR><TD colspan=3>&nbsp;</TD></TR><TR>
  <TD width="5%" valign=top>&nbsp;</TD>
	<TD width="5%" valign=top>
<FONT size=2 face="serif">(c)</FONT>&nbsp; &nbsp; &nbsp; 	</TD>
	<TD width=90%>
<FONT size=2 face="serif">The Corporation&#146;s Current Report on Form 8-K filed with the SEC on February 28, 2006, March 16, 2006, April 24, 2006, and May 3, 2006, pursuant to Section 13 or 15(d) of the 1934 Act;
and</FONT>	</TD>
</TR>
<TR><TD colspan=3>&nbsp;</TD></TR><TR>
  <TD width="5%" valign=top>&nbsp;</TD>
	<TD width="5%" valign=top>
<FONT size=2 face="serif">(d)</FONT>&nbsp; &nbsp; &nbsp; 	</TD>
	<TD width=90%>
<FONT size=2 face="serif">The description of the Registrant&#146;s common stock contained in its Registration Statement on Form 8-A, filed on March 23, 2004, pursuant to Section 12(g) of the 1934 Act, including any
amendment or report filed for the purpose of updating such description.</FONT>	</TD>
</TR></TABLE>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">All reports and definitive proxy or information statements filed pursuant to Section 13(a), 13(c), 14 or 15(d) of the 1934 Act after the date of this Registration
Statement and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold shall be deemed to be incorporated by reference into this
Registration Statement and to be a part hereof from the date of filing of such documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes
of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document which also is deemed to be incorporated by reference 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.</FONT></P>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="5%"><font size=2 face="serif">Item 4.</font></td>
    <td width="95%"><font size=2 face="serif"><u>Description of Securities</u></font></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%"><font size=2 face="serif">Not Applicable</font></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%"><font size=2 face="serif">Item 5</font></td>
    <td width="95%"><u><font size=2 face="serif"> </font><font size=2 face="serif">Interests
    of Named Experts and Counsel</font></u></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%"><font size=2 face="serif">Not Applicable</font></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%"><font size=2 face="serif">Item 6</font></td>
    <td width="95%"><u><font size=2 face="serif"> </font><font size=2 face="serif">Indemnification
    of Directors and Officers</font></u></td>
  </tr>
</table>
<P align="left">&nbsp;&nbsp;<I><FONT size=2 face="serif">Delaware General Corporation Law</FONT></I>
</P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its certificate of incorporation that a director of the corporation
shall not be personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability 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 unlawful payments of dividends or unlawful stock repurchases, redemptions or other distributions, or for any transaction from which
the director derived an improper personal benefit.</FONT></P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Section 145 of the Delaware General Corporation Law, as amended, provides that a corporation may indemnify directors and officers as well as other employees and
individuals against expenses (including attorneys&#146; fees),</FONT></P>

<br>
<hr width="100%" size=3 color=GRAY noshade>
<p style="page-break-before:always"></p>
<page>
<br>

<P align="left">
<FONT size=2 face="serif">judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with any threatened, pending or completed actions, suits or proceedings in which such
person is made a party by reason of such person being or having been a director, officer, employee or agent of the corporation, subject to certain limitations. The Delaware General Corporation Law provides that Section 145 is not exclusive of other
rights to which those seeking indemnification may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors or otherwise.</FONT></P>
<P align="left">
<I><FONT size=2 face="serif">&nbsp;&nbsp;&nbsp;Amended and Restated Certificate of Incorporation and Bylaws</FONT></I></P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Article Eight of the
Registrant's amended and restated certificate of incorporation provides for indemnification
by it of its directors, officers and employees to the fullest extent permitted
by Delaware law. Article Eight also provides that the Registrant may maintain
insurance on behalf of its directors, officers and employees.</FONT></P>
<P align="left">
<I><FONT size=2 face="serif">&nbsp;&nbsp;&nbsp;Indemnification Agreements and Directors&#146; and Officers&#146; Liability Insurance</FONT></I></P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">The Registrant expects
to maintain standard policies of insurance that provide coverage (1) to its directors
and officers against loss rising from claims made by  reason of breach of duty
or other wrongful act, and (2) to it with respect to indemnification payments
that it may make to such directors and officers.</FONT></P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">The Registrant has also
entered into separate indemnification agreements with its directors and officers
which may be broader than the indemnification provisions contained in Delaware
law.</FONT></P>
<P align="left">&nbsp;&nbsp;&nbsp;<i><font size=2 face="serif">Registration Rights Agreement</font></i>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Section 2.04 of the Registration
Rights Agreement dated as of December 2, 2002 between Ultra Clean Holdings, Inc.
and FP-Ultra Clean, LLC, the Registrant&#146;s
majority shareholder (the &#147;Registration Rights Agreement&#148;), provides
that the Registrant will indemnify and hold harmless FP-Ultra Clean, LLC and
certain other persons against losses, claims, damages, liabilities and expenses
relating to an untrue statement or alleged untrue statement of a material fact
in a registration statement or prospectus relating to its registrable securities
if it is found responsible for providing such statements, and for an omission
to state a material fact necessary to make statements in a registration statement
or prospectus not misleading, if it is found responsible for omitting to provide
such statements.</FONT></P>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="5%"><font size=2 face="serif">Item 7.</font></td>
    <td width="95%"><font size=2 face="serif"><u>Exemption from Registration Claimed</u></font></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%"><font size=2 face="serif">Not Applicable.</font></td>
  </tr>
  <tr>
    <td width="5%">&nbsp;</td>
    <td width="95%">&nbsp;</td>
  </tr>
  <tr>
    <td width="5%"><font size=2 face="serif">Item 8.</font></td>
    <td width="95%"><font size=2 face="serif"><u>Exhibits</u></font></td>
  </tr>
</table>
<br>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td width="9%"><u><font size=2 face="serif">Exhibit Number</font></u></td>
    <td width="91%"><u><font size=2 face="serif">Exhibit</font></u></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table>
<table width="100%" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="2%">&nbsp;</td>
    <TD width=7% align=left valign="bottom"><FONT size=2 face="serif">5.1</FONT> </TD>
    <TD width=91% align=left valign="bottom"><FONT size=2 face="serif">Opinion of Davis Polk &amp; Wardwell</FONT>&nbsp; </TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD align=left valign="bottom">&nbsp;</TD>
    <TD align=left valign="bottom">&nbsp;</TD>
  </tr>
  <tr>
    <td width="2%">&nbsp;</td>
    <TD width=7% align=left valign="bottom"><FONT size=2 face="serif">23.1</FONT> </TD>
    <TD width=91% align=left valign="bottom"><FONT size=2 face="serif">Consent of Independent Registered Public Accounting Firm</FONT>&nbsp; </TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD align=left valign="bottom">&nbsp;</TD>
    <TD align=left valign="bottom">&nbsp;</TD>
  </tr>
  <tr>
    <td width="2%">&nbsp;</td>
    <TD width=7% align=left valign="bottom"><FONT size=2 face="serif">23.2</FONT> </TD>
    <TD width=91% align=left valign="bottom"><FONT size=2 face="serif">Consent of Davis Polk &amp; Wardwell (included in Exhibit 5.1)</FONT>&nbsp; </TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD align=left valign="bottom">&nbsp;</TD>
    <TD align=left valign="bottom">&nbsp;</TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD width=7% align=left valign="bottom"><FONT size=2 face="serif">24</FONT> </TD>
    <TD width=91% align=left valign="bottom"><FONT size=2 face="serif">Power of Attorney (included on signature page)</FONT>&nbsp; </TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD align=left valign="bottom">&nbsp;</TD>
    <TD align=left valign="bottom">&nbsp;</TD>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <TD width=7% align=left valign="bottom"><FONT size=2 face="serif">99.1</FONT><FONT size=2 face="serif">(1)</FONT>&nbsp;</TD>
    <TD width=91% align=left valign="bottom"><FONT size=2 face="serif">Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan</FONT>&nbsp; </TD>
  </tr>
  <tr align="center">
    <td>&nbsp;</td>
    <td colspan="2"><hr align="left" width="8%" size="1" noshade color="#000000"></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td colspan="2" align="left"><FONT size=2 face="serif">(1)</FONT><font size=2 face="serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Incorporated by reference to Exhibit 99.1 of the Registrant&#146;s Form S-8 filed on March 30, 2004</font>&nbsp; </td>
  </tr>
</table>
<br>
<table width="100%" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="5%"><font size=2 face="serif">Item 9</font></td>
    <td width="95%"><font size=2 face="serif"><u>Undertakings</u></font></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table>
<p>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font size=2 face="serif">a.</font> <font size=2 face="serif">The undersigned
  Registrant hereby undertakes:</font>&nbsp; <br>

<br>
</p>
<hr width="100%" size=3 color=GRAY noshade>
<p style="page-break-before:always"></p>
<page>
<br>

<blockquote>
  <p align="left"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">(1) to file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement to include any material information
    with respect to the plan of distribution not previously disclosed in this Registration Statement or any material change to such information in this Registration Statement; </FONT></p>
  <p align="left"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">(2) that for the purpose of determining any liability under the 1933 Act each such post-effective amendment shall be deemed to be a new registration statement
    relating to the securities offered therein and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof; and</FONT></p>
  <p align="left"> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">(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 the
    offering.</FONT></p>
</blockquote>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">b. The undersigned Registrant hereby undertakes that, for purposes 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 1934 Act that is incorporated by reference into this 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.</FONT></P>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">c. Insofar as indemnification for liabilities arising under the 1933 Act may be permitted to directors, officers, or controlling persons of the Registrant pursuant
to the indemnification foregoing provisions summarized in Item 6 or otherwise, the Registrant has been advised that, in the opinion of the SEC, 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 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.<br>
</FONT></P>

<br>
<hr width="100%" size=3 color=GRAY noshade>
<p style="page-break-before:always"></p>
<page>
<br>

<P align="center">
<div align="center"><b><font size=2 face="serif">SIGNATURES</font></b>
  </P>
</div>
<P align="left">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT size=2 face="serif">Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all 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 the City of Menlo Park, State of California, on the 19th day of June, 2006.</FONT></P>
<TABLE border=0 width=100% cellspacing=0 cellpadding=0>
<TR valign="bottom">
  <TD width=56% align=left>&nbsp;</TD>
	<TD colspan="2" align=left><b><font size=2 face="serif">Ultra Clean Holdings, Inc.</font></b>&nbsp;</TD>
	<TD width=13% align=left>&nbsp;</TD>
</TR>
<TR>
  <TD width="56%">&nbsp;</TD>
	<TD width="3%">&nbsp;</TD>
	<TD width="28%">&nbsp;	</TD>
    <TD width="13%">&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=56% align=left>&nbsp;</TD>
	<TD width=3% align=left><b><font size=2 face="serif">By:</font></b>&nbsp;</TD>
	<TD width=28% align=left><FONT size=2 face="serif">/s/ Clarence L. Granger</FONT>&nbsp; </TD>
    <TD width=13% align=left>&nbsp;</TD>
</TR>
<TR>
  <TD align=left>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD align=left><hr align="left" width=100% size=1 noshade color="#000000"></TD>
  <TD align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=56% align=left>&nbsp;</TD>
	<TD width=3% align=left>&nbsp;</TD>
	<TD width=28% align=left><FONT size=2 face="serif">Clarence L. Granger</FONT>&nbsp;	</TD>
    <TD width=13% align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=56% align=left><p align="left"> <font size=2 face="serif">Date: June
        19, 2006</font></p></TD>
	<TD width=3% align=left>&nbsp;</TD>
	<TD width=28% align=left><FONT size=2 face="serif">President and Chief Executive Officer</FONT></TD>
    <TD width=13% align=left>&nbsp;</TD>
</TR>
</TABLE>
<P align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B><FONT size=2 face="serif">KNOW ALL PERSONS BY THESE PRESENTS</FONT></B><FONT size=2 face="serif">, that each person whose signature appears below constitutes
and appoints Clarence L. Granger and Jack Sexton, and each of them, as his/her true and lawful attorneys-in-fact and agents, with full power of substitution and re-substitution, for him/her in any and all capacities, to sign any and all amendments
to this Registration Statement and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming that each of said attorneys-in-fact and agents,
or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof. </FONT></P>
<P align="left">
<FONT size=2 face="serif">Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates
indicated. </FONT></P>
<TABLE border=0 width=80% cellspacing=0 cellpadding=0>
<TR valign="bottom">
	<TD width=30% align=center>
<B><FONT size=2 face="serif">Name</FONT></B>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<B><FONT size=2 face="serif">Title</FONT></B>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>
<B><FONT size=2 face="serif">Date</FONT></B>&nbsp;
	</TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
<HR noshade size=1>
	</TD>
</TR>
<TR>
	<TD width="30%" align="center">&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">President, Chief Executive Officer</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>
 <font size=2 face="serif">June 19</font><FONT size=2 face="serif">, 2006</FONT>&nbsp;
	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center><FONT size=2 face="serif">/s/ Clarence L. Granger</FONT>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">(Principal Executive Officer) and Director</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>
<FONT size=2 face="serif">Clarence L. Granger</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Vice President and Chief Financial Officer</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">(Principal Financial Officer and Principal</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <FONT size=2 face="serif">/s/ Jack Sexton</FONT>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Accounting Officer)</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>
<FONT size=2 face="serif">Jack Sexton</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <font size=2 face="serif">/s/ Brian R. Bachman</font>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Director</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
	</TD>
</TR>
<TR>
	<TD width="30%" align="center"> <font size=2 face="serif">Brian R. Bachman</font>&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <font size=2 face="serif">/s/ Susan H. Billat</font>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Director</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
	</TD>
</TR>
<TR>
	<TD width="30%" align="center"> <font size=2 face="serif">Susan H. Billat</font>&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <font size=2 face="serif">/s/ Dipanjan Deb</font>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Director</FONT>&nbsp;
	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">
	</TD>
	<TD width="40%">
	</TD>
	<TD width="4%">
	</TD>
	<TD width="22%" align="center">
	</TD>
</TR>
<TR>
	<TD width="30%" align="center"> <font size=2 face="serif">Dipanjan Deb</font>&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;

	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;

	</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
</TABLE>
<BR>

<br>
<hr width="100%" size=3 color=GRAY noshade>
<p style="page-break-before:always"></p>
<page>
<br>
<br>

<TABLE border=0 width=80% cellspacing=0 cellpadding=0>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD align=center> <FONT size=2 face="serif">/s/ Kevin C. Eichler</FONT>&nbsp;  </TD>
  <TD>&nbsp; </TD>
  <TD align=center> <FONT size=2 face="serif">Director</FONT>&nbsp; </TD>
  <TD>&nbsp; </TD>
  <TD align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
  <TD align="center">
    <HR noshade size=1>
  </TD>
  <TD> </TD>
  <TD> </TD>
  <TD> </TD>
  <TD align="center"> </TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>
<FONT size=2 face="serif">Kevin C. Eichler</FONT>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;	</TD>
</TR>
<TR valign="bottom">
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD align=center>&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <font size=2 face="serif">/s/ David ibnAle</font>&nbsp; 	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Director</FONT>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">	</TD>
	<TD width="40%">	</TD>
	<TD width="4%">	</TD>
	<TD width="22%" align="center">	</TD>
</TR>
<TR>
	<TD width="30%" align="center"> <font size=2 face="serif">David ibnAle</font>&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;	</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center> <font size=2 face="serif">/s/ Thomas M. Rohrs</font>&nbsp; 	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=center>
<FONT size=2 face="serif">Director</FONT>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center> <font size=2 face="serif">June 19</font><FONT size=2 face="serif">,
    2006</FONT>&nbsp; </TD>
</TR>
<TR>
	<TD width="30%" align="center">
<HR noshade size=1>
	</TD>
	<TD width="4%">	</TD>
	<TD width="40%">	</TD>
	<TD width="4%">	</TD>
	<TD width="22%" align="center">	</TD>
</TR>
<TR>
	<TD width="30%" align="center"> <font size=2 face="serif">Thomas M. Rohrs</font>&nbsp;

	</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="40%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="22%" align="center">&nbsp;</TD>
</TR>
<TR valign="bottom">
	<TD width=30% align=center>&nbsp;</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=40% align=left>&nbsp;	</TD>
	<TD width=4%>&nbsp;
	</TD>
	<TD width=22% align=center>&nbsp;	</TD>
</TR>
</TABLE><BR>

<br>
<hr width="100%" size=3 color=GRAY noshade>
<p style="page-break-before:always"></p>
<page>
<br>

<P align="center">
<div align="center"><b><font size=2 face="serif">EXHIBIT INDEX</font></b><br>
  </P>
</div>
<TABLE border=0 width=100% cellspacing=0 cellpadding=0>
<TR valign="bottom">
	<TD width=13% align=left><u>
<FONT size=2 face="serif">Exhibit Number</FONT>&nbsp;	</u></TD>
	<TD width=87%><u>
<FONT size=2 face="serif">Exhibit</FONT></u></TD>
  </TR>
</TABLE>
<BR>
<TABLE border=0 width=100% cellspacing=0 cellpadding=0>
<TR valign="bottom">
  <TD width=2% align=right>&nbsp;</TD>
	<TD width=11% align=left>
<FONT size=2 face="serif">5.1</FONT>	</TD>
	<TD width=87% align=left>
<FONT size=2 face="serif">Opinion of Davis Polk &amp; Wardwell</FONT>&nbsp;	</TD>
</TR>
<TR valign="bottom">
  <TD align=right>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=2% align=right>&nbsp;</TD>
	<TD width=11% align=left>
<FONT size=2 face="serif">23.1</FONT>	</TD>
	<TD width=87% align=left>
<FONT size=2 face="serif">Consent of Independent Registered Public Accounting Firm</FONT>&nbsp;	</TD>
</TR>
<TR valign="bottom">
  <TD align=right>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=2% align=right>&nbsp;</TD>
	<TD width=11% align=left>
<FONT size=2 face="serif">23.2</FONT>	</TD>
	<TD width=87% align=left>
<FONT size=2 face="serif">Consent of Davis Polk &amp; Wardwell (included in Exhibit 5.1)</FONT>&nbsp;	</TD>
</TR>
<TR valign="bottom">
  <TD align=right>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=2% align=right>&nbsp;</TD>
	<TD width=11% align=left>
<FONT size=2 face="serif">24</FONT>	</TD>
	<TD width=87% align=left>
<FONT size=2 face="serif">Power of Attorney (included on signature page)</FONT>&nbsp;	</TD>
</TR>
<TR valign="bottom">
  <TD align=right>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
  <TD align=left>&nbsp;</TD>
</TR>
<TR valign="bottom">
  <TD width=2% align=right>&nbsp;</TD>
	<TD width=11% align=left>
<FONT size=2 face="serif">99.1</FONT><font size=2 face="serif">(1)</font></TD>
	<TD width=87% align=left>
<FONT size=2 face="serif">Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan</FONT>&nbsp;	</TD>
</TR>
</TABLE>
<BR>
<TABLE border=0 width=100% cellspacing=0 cellpadding=0>
<TR valign="bottom">
  <TD align=right valign="middle">&nbsp;</TD>
  <TD colspan="2" align=left valign="middle"><hr align="left" width="8%" size="1" noshade color="#000000"></TD>
  </TR>
<TR valign="bottom">
	<TD width=2% align=right>&nbsp;</TD>
	<TD  width=6% align=left><font size=2 face="serif">(1)</font></TD>
	<TD>
<FONT size=2 face="serif">Incorporated by reference to Exhibit 99.1 of the Registrant&#146;s Form S-8 filed on March 30, 2004.</FONT>&nbsp;	</TD>
  </TR>
</TABLE>
<BR>
<br>
<hr width="100%" size=3 color=GRAY noshade>
</BODY>
</HTML>
[{"type": "S-8", "sequence": "1", "filename": "dp02836_s8.htm", "secsgml_size_bytes": 40343}]
{"company-data": {"conformed-name": "ULTRA CLEAN HOLDINGS INC", "cik": "0001275014", "assigned-sic": "3674", "irs-number": "611430858", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-135147", "film-number": "06914157"}, "mail-address": {"street1": "150 INDEPENDENCE DRIVE", "city": "MENLO PARK", "state": "CA", "zip": "94025"}}
As filed with the Securities and Exchange Commission on June 19,
    2006
Registration No. 333-
UNITED
      STATES
SECURITIES AND
      EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
      S-8
REGISTRATION
      STATEMENT
Under
The Securities Act of
        1933
ULTRA CLEAN HOLDINGS,
      INC.
(Exact name of registrant as
      specified in its charter)
Delaware
61-1430858
(State or other jurisdiction
(IRS Employer Identification
      No.)
of incorporation or
      organization)
150
      INDEPENDENCE DRIVE
MENLO PARK,
      CA 94025
(Address of principal executive
offices) (Zip Code)
ULTRA CLEAN HOLDINGS, INC. AMENDED AND RESTATED STOCK
      INCENTIVE PLAN
(Full title of the
Plan)
INCORPORATING SERVICES, INC.
15 EAST NORTH
      STREET
DOVER, DE 19901
(800) 346-4646
(Name, address including
        zip code, and telephone number,
including area code, of agent for
service)
Copies to:
Alan F. Denenberg, Esq.
Davis Polk &
    Wardwell
1600 El Camino Real
Menlo Park, California 94025
(650)
752-2000
CALCULATION OF REGISTRATION
  FEE
Title of
      Securities
to be
    Registered
Amount
      to be
Registered (1)
Proposed
Maximum
      Offering
Price
    per Share (2)
Proposed
      Maximum
Aggregate
      Offering
Price (2)
Amount of
Registration
    Fee
Common Stock, $0.001 par
      value
330,027 shares
$7.81
$2,577,511
$276
(1)
This Registration Statement covers shares being added to
      the Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan.
      This Registration Statement shall also cover any additional shares of
      common stock which become issuable under the Ultra Clean Holdings,
      Inc. Amended and Restated Stock Incentive Plan by
      reason of any stock dividend, stock split, recapitalization or other
      similar transaction effected without Registrant's receipt of consideration
      which results in an increase in the number of the outstanding shares of
      Registrant's common stock.
(2)
Calculated under Rule 457(h) of
        the Securities Act of 1933, as amended, on the basis of the average of
        the high and low selling prices per share of the Registrant's Common
        Stock on June 14,  2006 as reported by the NASDAQ National Market.
PART II
Information Required in the Registration Statement
Item 3.
Incorporation
of Documents by Reference
Ultra Clean Holdings, Inc. (the "Registrant") hereby incorporates by reference into this Registration Statement the following documents previously filed
with the Securities and Exchange Commission (the "SEC"):
(a)
The Corporation's Annual Report on Form 10-K for the fiscal year ended December 31, 2005, filed with the SEC on February 28, 2006, pursuant to Section 13 of the Securities Exchange Act of
1934, as amended (the "1934 Act");
(b)
The Corporation's Quarterly Report on Form 10-Q for the quarter ended March 31, 2006, filed with the SEC on May 15, 2006, pursuant to Section 13 of the 1934 Act;
(c)
The Corporation's Current Report on Form 8-K filed with the SEC on February 28, 2006, March 16, 2006, April 24, 2006, and May 3, 2006, pursuant to Section 13 or 15(d) of the 1934 Act;
and
(d)
The description of the Registrant's common stock contained in its Registration Statement on Form 8-A, filed on March 23, 2004, pursuant to Section 12(g) of the 1934 Act, including any
amendment or report filed for the purpose of updating such description.
All reports and definitive proxy or information statements filed pursuant to Section 13(a), 13(c), 14 or 15(d) of the 1934 Act after the date of this Registration
Statement and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold shall be deemed to be incorporated by reference into this
Registration Statement and to be a part hereof from the date of filing of such documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes
of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document which also is deemed to be incorporated by reference 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
Not Applicable
Item 6
Indemnification
    of Directors and Officers
Delaware General Corporation Law
Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its certificate of incorporation that a director of the corporation
shall not be personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability 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 unlawful payments of dividends or unlawful stock repurchases, redemptions or other distributions, or for any transaction from which
the director derived an improper personal benefit.
Section 145 of the Delaware General Corporation Law, as amended, provides that a corporation may indemnify directors and officers as well as other employees and
individuals against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with any threatened, pending or completed actions, suits or proceedings in which such
person is made a party by reason of such person being or having been a director, officer, employee or agent of the corporation, subject to certain limitations. The Delaware General Corporation Law provides that Section 145 is not exclusive of other
rights to which those seeking indemnification may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors or otherwise.
Amended and Restated Certificate of Incorporation and Bylaws
Article Eight of the
Registrant's amended and restated certificate of incorporation provides for indemnification
by it of its directors, officers and employees to the fullest extent permitted
by Delaware law. Article Eight also provides that the Registrant may maintain
insurance on behalf of its directors, officers and employees.
Indemnification Agreements and Directors' and Officers' Liability Insurance
The Registrant expects
to maintain standard policies of insurance that provide coverage (1) to its directors
and officers against loss rising from claims made by  reason of breach of duty
or other wrongful act, and (2) to it with respect to indemnification payments
that it may make to such directors and officers.
The Registrant has also
entered into separate indemnification agreements with its directors and officers
which may be broader than the indemnification provisions contained in Delaware
law.
Registration Rights Agreement
Section 2.04 of the Registration
Rights Agreement dated as of December 2, 2002 between Ultra Clean Holdings, Inc.
and FP-Ultra Clean, LLC, the Registrant's
majority shareholder (the "Registration Rights Agreement"), provides
that the Registrant will indemnify and hold harmless FP-Ultra Clean, LLC and
certain other persons against losses, claims, damages, liabilities and expenses
relating to an untrue statement or alleged untrue statement of a material fact
in a registration statement or prospectus relating to its registrable securities
if it is found responsible for providing such statements, and for an omission
to state a material fact necessary to make statements in a registration statement
or prospectus not misleading, if it is found responsible for omitting to provide
such statements.
Item 7.
Exemption from Registration Claimed
Not Applicable.
Item 8.
Exhibits
Exhibit Number
Exhibit
5.1
Opinion of Davis Polk & Wardwell
23.1
Consent of Independent Registered Public Accounting Firm
23.2
Consent of Davis Polk & Wardwell (included in Exhibit 5.1)
24
Power of Attorney (included on signature page)
99.1
(1)
Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan
(1)
Incorporated by reference to Exhibit 99.1 of the Registrant's Form S-8 filed on March 30, 2004
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 to include any material information
    with respect to the plan of distribution not previously disclosed in this Registration Statement or any material change to such information in this Registration Statement;
(2) that for the purpose of determining any liability under the 1933 Act each such post-effective amendment shall be deemed to be a new registration statement
    relating to the securities offered therein and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof; and
(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 the
    offering.
b. The undersigned Registrant hereby undertakes that, for purposes 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 1934 Act that is incorporated by reference into this 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, or controlling persons of the Registrant pursuant
to the indemnification foregoing provisions summarized in Item 6 or otherwise, the Registrant has been advised that, in the opinion of the SEC, 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 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.
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all 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 the City of Menlo Park, State of California, on the 19th day of June, 2006.
Ultra Clean Holdings, Inc.
By:
/s/ Clarence L. Granger
Clarence L. Granger
Date: June
        19, 2006
President and Chief Executive Officer
KNOW ALL PERSONS BY THESE PRESENTS
, that each person whose signature appears below constitutes
and appoints Clarence L. Granger and Jack Sexton, and each of them, as his/her true and lawful attorneys-in-fact and agents, with full power of substitution and re-substitution, for him/her in any and all capacities, to sign any and all amendments
to this Registration Statement and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming that each of said attorneys-in-fact and agents,
or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates
indicated.
Name
Title
Date
President, Chief Executive Officer
June 19
, 2006
/s/ Clarence L. Granger
(Principal Executive Officer) and Director
Clarence L. Granger
Vice President and Chief Financial Officer
June 19
,
    2006
(Principal Financial Officer and Principal
/s/ Jack Sexton
Accounting Officer)
Jack Sexton
/s/ Brian R. Bachman
Director
June 19
,
    2006
Brian R. Bachman
/s/ Susan H. Billat
Director
June 19
,
    2006
Susan H. Billat
/s/ Dipanjan Deb
Director
June 19
,
    2006
Dipanjan Deb
/s/ Kevin C. Eichler
Director
June 19
,
    2006
Kevin C. Eichler
/s/ David ibnAle
Director
June 19
,
    2006
David ibnAle
/s/ Thomas M. Rohrs
Director
June 19
,
    2006
Thomas M. Rohrs
EXHIBIT INDEX
Exhibit Number
Exhibit
5.1
Opinion of Davis Polk & Wardwell
23.1
Consent of Independent Registered Public Accounting Firm
23.2
Consent of Davis Polk & Wardwell (included in Exhibit 5.1)
24
Power of Attorney (included on signature page)
99.1
(1)
Ultra Clean Holdings, Inc. Amended and Restated Stock Incentive Plan
(1)
Incorporated by reference to Exhibit 99.1 of the Registrant's Form S-8 filed on March 30, 2004.