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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-weight: normal">As filed
with the Securities and Exchange Commission on July 25, 2017</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><FONT STYLE="font-weight: normal">Registration
No. 333-</FONT></P>

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<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 1pt; margin-bottom: 1pt"><DIV STYLE="font-size: 1pt; border-top: Black 0.5pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>UNITED
STATES</B>&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>SECURITIES
AND EXCHANGE COMMISSION</B></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt">Washington,
D.C. 20549</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt">&nbsp;____________________</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt">&nbsp;</FONT></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>FORM S-8
</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>REGISTRATION
STATEMENT</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><I>Under</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><I>The Securities
Act of 1933</I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt">____________________</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt">&nbsp;</FONT></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>ULTRA
CLEAN HOLDINGS, INC.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact name of registrant as specified in<BR>
its charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 34%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Delaware</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(State or other jurisdiction</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">of incorporation or organization)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P></TD>
    <TD STYLE="width: 33%; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 33%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>61-1430858</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(IRS Employer Identification No.)&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>26462 CORPORATE AVENUE</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>HAYWARD, CA 94545</B>&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address of principal executive offices)
        (Zip Code)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P></TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ULTRA CLEAN HOLDINGS, INC. AMENDED AND
RESTATED STOCK INCENTIVE PLAN</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Full title of the Plan)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>James P. Scholhamer</B><BR>
<B>Chief Executive Officer</B><BR>
<B>Ultra Clean Holdings, Inc.</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>26462 Corporate Avenue</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Hayward, CA 94545</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(510) 576-4600</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Name, address including zip code, and telephone
number,<BR>
including area code, of agent for service)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>Copies to:</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Alan F. Denenberg, Esq.<BR>
Davis Polk &amp; Wardwell LLP<BR>
1600 El Camino Real</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;Menlo Park, California 94025<BR>
(650) 752-2000</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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 &ldquo;large accelerated filer,&rdquo; &ldquo;accelerated filer&rdquo; and &ldquo;smaller reporting company&rdquo; in Rule 12b-2
of the Exchange Act. (Check one):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 22%; text-align: center; font-size: 10pt"><FONT STYLE="font-size: 10pt">Large accelerated filer &#9744;</FONT></TD>
    <TD STYLE="width: 23%; text-align: center; font-size: 10pt"><FONT STYLE="font-size: 10pt">Accelerated filer <FONT STYLE="font-family: Wingdings">&#120;</FONT><FONT STYLE="font-family: Wingdings 2"></FONT></FONT></TD>
    <TD STYLE="width: 32%; text-align: center">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Non-accelerated filer
        <FONT STYLE="font-family: Wingdings 2"><FONT STYLE="font-family: Wingdings">&#111;</FONT></FONT></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(Do not check if a smaller
        reporting company)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"></P></TD>
    <TD STYLE="width: 23%; text-align: center; font-size: 10pt"><FONT STYLE="font-size: 10pt">Smaller reporting company&#9;<FONT STYLE="font-family: Wingdings 2"><FONT STYLE="font-family: Wingdings">&#111;</FONT></FONT></FONT></TD></TR>
</TABLE>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">CALCULATION OF REGISTRATION FEE</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 36%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Title
of Securities to be Registered&nbsp;</P></TD>
    <TD STYLE="width: 17%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Amount
to be<BR>
Registered (1)&nbsp;</P></TD>
    <TD STYLE="width: 14%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Proposed<BR>
Maximum<BR>
Offering Price<BR>
per Share (2)&nbsp;</P></TD>
    <TD STYLE="width: 17%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Proposed
Maximum<BR>
Aggregate Offering<BR>
Price (2)&nbsp;</P></TD>
    <TD STYLE="width: 16%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Amount
of<BR>
Registration Fee&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">Common Stock, $0.001 par value</TD>
    <TD STYLE="font-size: 10pt; text-align: center">2,700,000 shares</TD>
    <TD STYLE="font-size: 10pt; text-align: center">$24.10</TD>
    <TD STYLE="font-size: 10pt; text-align: center">$65,056,500</TD>
    <TD STYLE="font-size: 10pt; text-align: center">$7,540.05</TD></TR>
</TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>This Registration Statement shall 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 the Registrant&rsquo;s receipt of consideration which results in an increase in the number of the
outstanding shares of the Registrant&rsquo;s common stock.</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>Calculated under Rule 457(h) of the Securities Act of 1933, as amended (&ldquo;1933 Act&rdquo;), on the basis of the average
of the high and low selling prices per share of the Registrant&rsquo;s Common Stock on July 20, 2017 as reported by the NASDAQ
Global Market, rounded to the nearest penny.</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">PART I<BR>
<BR>
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 1.</TD><TD>PLAN INFORMATION</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">The documents containing the information
specified in this Item 1 will be sent or given to participants as specified by Rule 428(b)(1) under the Securities Act of 1933,
as amended (the &ldquo;Securities Act&rdquo;). In accordance with the rules and regulations of the Securities and Exchange Commission
(the &ldquo;SEC&rdquo;) and the instructions to Form S-8, such documents are not being filed with the SEC either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 2.</TD><TD>REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">The documents containing the information
specified in this Item 2 will be sent or given to participants as specified by Rule 428(b)(1) under the Securities Act. In accordance
with the rules and regulations of the SEC and the instructions to Form S-8, such documents are not being filed with the SEC either
as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">PART II<BR>
<BR>
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 3.</TD><TD>INCORPORATION OF DOCUMENTS BY REFERENCE</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Ultra Clean Holdings, Inc. (the &ldquo;Registrant&rdquo;)
hereby incorporates by reference into this Registration Statement the following documents previously filed with the SEC:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(a)</TD><TD>The Registrant&rsquo;s Annual Report on Form 10-K for the fiscal year ended December 30, 2016, filed with the SEC on March
15, 2017, pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the &ldquo;1934 Act&rdquo;);</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(c)</TD><TD>The Registrant&rsquo;s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2017, filed with the SEC on May
10, 2017, pursuant to Section 13 of the 1934 Act;</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(d)</TD><TD>The Registrant&rsquo;s Current Reports on Form 8-K filed with the SEC on April 26, 2017 and May 30, 2017, pursuant to Section
13 or 15(d) of the 1934 Act; and</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 27pt">(e)</TD><TD>The description of the Registrant&rsquo;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.</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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; except as to any portion of any future annual or quarterly report to stockholders
or document or current report furnished under current Items 2.02 or 7.01 of Form 8-K that is not deemed filed under such provisions.
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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 4.</TD><TD>DESCRIPTION OF SECURITIES</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Not Applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>


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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 5.</TD><TD>INTERESTS OF NAMED EXPERTS AND COUNSEL</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Not Applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 6.</TD><TD>INDEMNIFICATION OF DIRECTORS AND OFFICERS</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">Delaware General Corporation Law</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Section 102(b)(7) of the Delaware General
Corporation Law, as amended, 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&rsquo;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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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&rsquo; 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">Amended and Restated Certificate of Incorporation</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Article Eight of our amended and restated
certificate of incorporation provides for indemnification by us of our directors, officers and employees to the fullest extent
permitted by Delaware law. Article Eight also provides that we may maintain insurance on behalf of our directors, officers and
employees.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">Indemnification Agreements and Directors&rsquo;
and Officers&rsquo; Liability Insurance</P>

<P STYLE="font: italic 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">The Registrant expects to maintain standard
policies of insurance that provide coverage (1) to our directors and officers against loss rising from claims made by reason of
breach of duty or other wrongful act, and (2) to us with respect to indemnification payments that we may make to such directors
and officers.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">We have also entered into separate indemnification
agreements with our directors and officers which may be broader than the indemnification provisions contained in Delaware law.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 7.</TD><TD>EXEMPTION FROM REGISTRATION CLAIMED</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Not Applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in">ITEM 8.</TD><TD>EXHIBITS</TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 8%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Exhibit
Number&nbsp;</P></TD>
    <TD STYLE="width: 40%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Description&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Form&nbsp;</P></TD>
    <TD STYLE="width: 13%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">File
No.&nbsp;</P></TD>
    <TD STYLE="width: 16%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Filing
Date&nbsp;</P></TD>
    <TD STYLE="width: 7%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Exhibit&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Filed
Herewith&nbsp;</P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">4.1</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Certificate of Incorporation</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">S-1/A</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">333-111904</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">March 2, 2004</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">3.1</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">4.2</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Bylaws</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">10-Q</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">000-50646</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">May 2, 2016</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">3.1</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">5.1</TD>
    <TD STYLE="vertical-align: top">Opinion of Davis Polk &amp; Wardwell LLP</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.1</TD>
    <TD STYLE="vertical-align: top">Consent of Moss Adams LLP, independent registered public accounting firm</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
</TABLE>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 8%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Exhibit
Number&nbsp;</P></TD>
    <TD STYLE="width: 40%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Description&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Form&nbsp;</P></TD>
    <TD STYLE="width: 13%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">File
No.&nbsp;</P></TD>
    <TD STYLE="width: 16%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Filing
Date&nbsp;</P></TD>
    <TD STYLE="width: 7%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Exhibit&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Filed
Herewith&nbsp;</P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.2</TD>
    <TD STYLE="vertical-align: top">Consent of Deloitte &amp; Touche LLP, independent registered public accounting firm</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.3</TD>
    <TD STYLE="vertical-align: top">Consent of Davis Polk &amp; Wardwell LLP (contained in Exhibit 5.1)</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">24.1</TD>
    <TD STYLE="vertical-align: top">Power of Attorney (included on the signature page of this registration statement)</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">99.1</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Stock Incentive Plan</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
</TABLE>
<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: bold 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.75in; text-align: left">ITEM 9.</TD><TD>UNDERTAKINGS</TD>
</TR></TABLE>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">a.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
undersigned Registrant hereby undertakes:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(1)&nbsp;&nbsp;&nbsp;&nbsp;To
file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">(i) To include any prospectus
required by Section 10(a)(3) of the 1933 Act;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">(ii) To reflect in the prospectus
any facts or events arising after the effective date of this Registration Statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this Registration
Statement. <FONT STYLE="font-family: Times New Roman, Times, Serif">Notwithstanding the foregoing, any increase or decrease in
volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any
deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with
the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent
change in the maximum aggregate offering price set forth in the &ldquo;Calculation of Registration Fee&rdquo; table in this Registration
Statement;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">(iii) 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;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in"><I>provided</I>, <I>however</I>, that clauses
(a)(1)(i) and (a)(1)(ii) shall not apply if the information required to be included in a post-effective amendment by those paragraphs
is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the 1934
Act that are incorporated by reference in this Registration Statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(2)&nbsp;&nbsp;&nbsp;&nbsp;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</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(3)&nbsp;&nbsp;&nbsp;&nbsp;To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the
termination of the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">b.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
undersigned Registrant hereby undertakes that, for purposes of determining any liability under the 1933 Act, each filing of the
Registrant&rsquo;s annual report pursuant to Section 13(a) or Section 15(d) of the 1934 Act (and, where applicable, each filing
of an employee benefit plan&rsquo;s annual report pursuant to 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">c.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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 foregoing provisions 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SIGNATURES</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">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 Hayward, State of California, on the 25th day of July, 2017.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><B>Ultra Clean Holdings, Inc.</B></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>By:</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid">/s/ James P. Scholhamer</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 55%">&nbsp;</TD>
    <TD STYLE="width: 4%">&nbsp;</TD>
    <TD STYLE="width: 6%">Name:</TD>
    <TD STYLE="width: 25%">James P. Scholhamer</TD>
    <TD STYLE="width: 10%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Title:</TD>
    <TD>Chief Executive Officer</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><B>KNOW ALL PERSONS BY THESE PRESENTS</B>,
that each person whose signature appears below constitutes and appoints James P. Scholhamer and Sheri Brumm, 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.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">Pursuant to the requirements of the Securities
Act of 1933, as amended, this Report has been signed below by the following persons on behalf of the Registrant and in the capacities
and on the dates indicated.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 28%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Name&nbsp;</P></TD>
    <TD STYLE="width: 54%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Title&nbsp;</P></TD>
    <TD STYLE="width: 18%; text-align: center; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Date&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Clarence L. Granger&nbsp;</P></TD>
    <TD STYLE="text-align: center">Chairman</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Clarence L. Granger</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
James P. Scholhamer&nbsp;</P></TD>
    <TD STYLE="text-align: center">Chief Executive Officer and Director </TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">James P. Scholhamer</FONT></TD>
    <TD STYLE="text-align: center">(Principal Executive Officer)</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Sheri Brumm&nbsp;</P></TD>
    <TD STYLE="text-align: center">Chief Financial Officer and Senior Vice President of Finance</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Sheri Brumm</FONT></TD>
    <TD STYLE="text-align: center">(Principal Financial Officer and Principal Accounting Officer)</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Leonid Mezhvinsky&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Leonid Mezhvinsky</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Emily M. Liggett&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Emily M. Liggett</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Thomas T. Edman&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Thomas T. Edman</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Barbara V. Scherer&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Barbara V. Scherer</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
David T. IbnAle&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">David IbnAle</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center; font-size: 8pt; font-weight: bold">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in; border-bottom: Black 0.5pt solid">/s/
Jeff Andreson&nbsp;</P></TD>
    <TD STYLE="text-align: center">Director</TD>
    <TD STYLE="text-align: center">July 25, 2017</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; font-size: 8pt; font-weight: bold"><FONT STYLE="font-size: 10pt; font-weight: normal">Jeff Andreson</FONT></TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
</TABLE>

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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">EXHIBIT INDEX</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 8%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Exhibit
Number&nbsp;</P></TD>
    <TD STYLE="width: 40%; padding-right: 5pt">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-bottom: Black 0.5pt solid">Description&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Form&nbsp;</P></TD>
    <TD STYLE="width: 13%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">File
No.&nbsp;</P></TD>
    <TD STYLE="width: 16%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Filing
Date&nbsp;</P></TD>
    <TD STYLE="width: 7%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Exhibit&nbsp;</P></TD>
    <TD STYLE="width: 8%; padding-right: 5pt; text-align: center">
        <P STYLE="font: bold 8pt Times New Roman, Times, Serif; margin-top: 0pt; border-bottom: Black 0.5pt solid; margin-bottom: 0pt; text-align: center">Filed
Herewith</P></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">4.1</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Certificate of Incorporation</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">S-1/A</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">333-111904</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">March 2, 2004</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">3.1</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">4.2</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Bylaws</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">10-Q</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">000-50646</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">May 2, 2016</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">3.1</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">5.1</TD>
    <TD STYLE="vertical-align: top">Opinion of Davis Polk &amp; Wardwell LLP</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.1</TD>
    <TD STYLE="vertical-align: top">Consent of Moss Adams LLP, independent registered public accounting firm</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.2</TD>
    <TD STYLE="vertical-align: top">Consent of Deloitte &amp; Touche LLP, independent registered public accounting firm</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">23.3</TD>
    <TD STYLE="vertical-align: top">Consent of Davis Polk &amp; Wardwell LLP (contained in Exhibit 5.1)</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">24.1</TD>
    <TD STYLE="vertical-align: top">Power of Attorney (included on the signature page of this registration statement)</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top">99.1</TD>
    <TD STYLE="vertical-align: top">Amended and Restated Stock Incentive Plan</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">X</TD></TR>
</TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

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{"company-data": {"conformed-name": "Ultra Clean Holdings, Inc.", "cik": "0001275014", "assigned-sic": "3674", "irs-number": "611430858", "state-of-incorporation": "DE", "fiscal-year-end": "1230"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-219447", "film-number": "17980759"}, "business-address": {"street1": "26462 CORPORATE AVENUE", "city": "HAYWARD", "state": "CA", "zip": "94545", "phone": "(510) 576-4400"}, "mail-address": {"street1": "26462 CORPORATE AVENUE", "city": "HAYWARD", "state": "CA", "zip": "94545"}, "former-company": {"former-conformed-name": "ULTRA CLEAN HOLDINGS INC", "date-changed": "20031231"}}
As filed
with the Securities and Exchange Commission on July 25, 2017
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
(State or other jurisdiction
of incorporation or organization)
61-1430858
(IRS Employer Identification No.)
26462 CORPORATE AVENUE
HAYWARD, CA 94545
(Address of principal executive offices)
        (Zip Code)
____________________
ULTRA CLEAN HOLDINGS, INC. AMENDED AND
RESTATED STOCK INCENTIVE PLAN
(Full title of the Plan)
____________________
James P. Scholhamer
Chief Executive Officer
Ultra Clean Holdings, Inc.
26462 Corporate Avenue
Hayward, CA 94545
(510) 576-4600
(Name, address including zip code, and telephone
number,
including area code, of agent for service)
____________________
Copies to:
Alan F. Denenberg, Esq.
Davis Polk & Wardwell LLP
1600 El Camino Real
Menlo Park, California 94025
(650) 752-2000
____________________
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. (Check one):
Large accelerated filer ☐
Accelerated filer
x
Non-accelerated filer
o
(Do not check if a smaller
        reporting company)
Smaller reporting company
o
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
2,700,000 shares
$24.10
$65,056,500
$7,540.05
(1)
This Registration Statement shall 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 the Registrant's receipt of consideration which results in an increase in the number of the
outstanding shares of the Registrant's common stock.
(2)
Calculated under Rule 457(h) of the Securities Act of 1933, as amended ("1933 Act"), on the basis of the average
of the high and low selling prices per share of the Registrant's Common Stock on July 20, 2017 as reported by the NASDAQ
Global Market, rounded to the nearest penny.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
ITEM 1.
PLAN INFORMATION
The documents containing the information
specified in this Item 1 will be sent or given to participants as specified by Rule 428(b)(1) under the Securities Act of 1933,
as amended (the "Securities Act"). In accordance with the rules and regulations of the Securities and Exchange Commission
(the "SEC") and the instructions to Form S-8, such documents are not being filed with the SEC either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act.
ITEM 2.
REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION
The documents containing the information
specified in this Item 2 will be sent or given to participants as specified by Rule 428(b)(1) under the Securities Act. In accordance
with the rules and regulations of the SEC and the instructions to Form S-8, such documents are not being filed with the SEC either
as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act.
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 SEC:
(a)
The Registrant's Annual Report on Form 10-K for the fiscal year ended December 30, 2016, filed with the SEC on March
15, 2017, pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the "1934 Act");
(c)
The Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2017, filed with the SEC on May
10, 2017, pursuant to Section 13 of the 1934 Act;
(d)
The Registrant's Current Reports on Form 8-K filed with the SEC on April 26, 2017 and May 30, 2017, pursuant to Section
13 or 15(d) of the 1934 Act; and
(e)
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; except as to any portion of any future annual or quarterly report to stockholders
or document or current report furnished under current Items 2.02 or 7.01 of Form 8-K that is not deemed filed under such provisions.
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, as amended, 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
Article Eight of our amended and restated
certificate of incorporation provides for indemnification by us of our directors, officers and employees to the fullest extent
permitted by Delaware law. Article Eight also provides that we may maintain insurance on behalf of our 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 our directors and officers against loss rising from claims made by reason of
breach of duty or other wrongful act, and (2) to us with respect to indemnification payments that we may make to such directors
and officers.
We have also entered into separate indemnification
agreements with our directors and officers which may be broader than the indemnification provisions contained in Delaware law.
ITEM 7.
EXEMPTION FROM REGISTRATION CLAIMED
Not Applicable.
ITEM 8.
EXHIBITS
Exhibit
Number
Description
Form
File
No.
Filing
Date
Exhibit
Filed
Herewith
4.1
Amended and Restated Certificate of Incorporation
S-1/A
333-111904
March 2, 2004
3.1
4.2
Amended and Restated Bylaws
10-Q
000-50646
May 2, 2016
3.1
5.1
Opinion of Davis Polk & Wardwell LLP
X
23.1
Consent of Moss Adams LLP, independent registered public accounting firm
X
Exhibit
Number
Description
Form
File
No.
Filing
Date
Exhibit
Filed
Herewith
23.2
Consent of Deloitte & Touche LLP, independent registered public accounting firm
X
23.3
Consent of Davis Polk & Wardwell LLP (contained in Exhibit 5.1)
X
24.1
Power of Attorney (included on the signature page of this registration statement)
X
99.1
Amended and Restated Stock Incentive Plan
X
ITEM 9.
UNDERTAKINGS
a.     The
undersigned Registrant hereby undertakes:
(1)    To
file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement:
(i) To include any prospectus
required by Section 10(a)(3) of the 1933 Act;
(ii) To reflect in the prospectus
any facts or events arising after the effective date of this Registration Statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this Registration
Statement.
Notwithstanding the foregoing, any increase or decrease in
volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any
deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with
the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent
change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in this Registration
Statement;
(iii) 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;
provided
,
however
, that clauses
(a)(1)(i) and (a)(1)(ii) shall not apply if the information required to be included in a post-effective amendment by those paragraphs
is contained in reports filed with or furnished to the SEC by the Registrant pursuant to Section 13 or Section 15(d) of the 1934
Act that are incorporated by reference 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 (and, where applicable, each filing
of an employee benefit plan's annual report pursuant to 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 foregoing provisions 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 Hayward, State of California, on the 25th day of July, 2017.
Ultra Clean Holdings, Inc.
By:
/s/ James P. Scholhamer
Name:
James P. Scholhamer
Title:
Chief Executive Officer
KNOW ALL PERSONS BY THESE PRESENTS
,
that each person whose signature appears below constitutes and appoints James P. Scholhamer and Sheri Brumm, 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
Act of 1933, as amended, 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
/s/
Clarence L. Granger
Chairman
July 25, 2017
Clarence L. Granger
/s/
James P. Scholhamer
Chief Executive Officer and Director
July 25, 2017
James P. Scholhamer
(Principal Executive Officer)
/s/
Sheri Brumm
Chief Financial Officer and Senior Vice President of Finance
July 25, 2017
Sheri Brumm
(Principal Financial Officer and Principal Accounting Officer)
/s/
Leonid Mezhvinsky
Director
July 25, 2017
Leonid Mezhvinsky
/s/
Emily M. Liggett
Director
July 25, 2017
Emily M. Liggett
/s/
Thomas T. Edman
Director
July 25, 2017
Thomas T. Edman
/s/
Barbara V. Scherer
Director
July 25, 2017
Barbara V. Scherer
/s/
David T. IbnAle
Director
July 25, 2017
David IbnAle
/s/
Jeff Andreson
Director
July 25, 2017
Jeff Andreson
EXHIBIT INDEX
Exhibit
Number
Description
Form
File
No.
Filing
Date
Exhibit
Filed
Herewith
4.1
Amended and Restated Certificate of Incorporation
S-1/A
333-111904
March 2, 2004
3.1
4.2
Amended and Restated Bylaws
10-Q
000-50646
May 2, 2016
3.1
5.1
Opinion of Davis Polk & Wardwell LLP
X
23.1
Consent of Moss Adams LLP, independent registered public accounting firm
X
23.2
Consent of Deloitte & Touche LLP, independent registered public accounting firm
X
23.3
Consent of Davis Polk & Wardwell LLP (contained in Exhibit 5.1)
X
24.1
Power of Attorney (included on the signature page of this registration statement)
X
99.1
Amended and Restated Stock Incentive Plan
X