Document:

Exhibit 10.9

AMENDED AND RESTATED

REGISTRATION RIGHTS AGREEMENT

dated as of 

June 29, 2006

among

ULTRA CLEAN HOLDINGS, INC.,

FP-ULTRA CLEAN L.L.C., 

     LEONID AND INNA MEZHVINSKY AS TRUSTEES OF THE

REVOCABLE TRUST AGREEMENT OF LEONID MEZHVINSKY AND

INNA MEZHVINSKY DATED APRIL 26, 1988, 

JOE AND JENNY CHEN AS TRUSTEES OF THE JOE CHEN AND 

JENNY CHEN REVOCABLE TRUST DATED 2002, 

VICTOR MEZHVINSKY,

     VICTOR MEZHVINSKY AS TRUSTEE OF THE JOSHUA 

MEZHVINSKY 2004 IRREVOCABLE TRUST UNDER AGREEMENT 

DATED JUNE 4, 2004,

DAVID HONGYU WU AND WINNIE WEI ZHEN WU AS TRUSTEES OF 

THE CHEN MINORS IRREVOCABLE TRUST, 

AND

FRANK MOREMAN

TABLE OF CONTENTS 

	 

		 
		 

		 
		
PAGE
	
	 
	
ARTICLE 1
	
	
DEFINITIONS
	
	
Section
1.01		 
		
Definitions
		 
		
2
	
	 	 	 	 	 
	
ARTICLE 2
	
	
REGISTRATION RIGHTS
	
	
Section
2.01		 
		
Demand Registration
		 
		
5
	
	
Section
2.02		 
		
Piggyback Registration
		 
		
7
	
	
Section
2.03		 
		
Registration Procedures
		 
		
9
	
	
Section
2.04		 
		
Indemnification by the Company
		 
		
12
	
	
Section
2.05		 
		
Indemnification by Participating Stockholders
		 
		
13
	
	
Section
2.06		 
		
Conduct of Indemnification Proceedings
		 
		
14
	
	
Section
2.07		 
		
Contribution
		 
		
15
	
	
Section
2.08		 
		
Participation in Public Offering
		 
		
16
	
	
Section
2.09		 
		
Other Indemnification
		 
		
16
	
	
Section
2.10		 
		
Cooperation by the Company
		 
		
16
	
	
Section
2.11		 
		
No Transfer of Registration Rights
		 
		
17
	
	 	 	 	 	 
	
ARTICLE 3
	
	
CERTAIN COVENANTS AND 
AGREEMENTS
	
	
Section
3.01		 
		
Reports
		 
		
17
	
	
Section
3.02		 
		
Limitations on Subsequent Registration Rights
		 
		
18
	
	
Section
3.03		 
		
Conflicting Agreements
		 
		
18
	
	 	 	 	 	 
	
ARTICLE 4
	
	
MISCELLANEOUS
	
	
Section
4.01		 
		
Lockup Agreement
		 
		
19
	
	
Section
4.02		 
		
Binding Effect; Assignability; Benefit
		 
		
19
	
	
Section
4.03		 
		
Notices
		 
		
19
	
	
Section
4.04		 
		
Waiver; Amendment; Termination
		 
		
21
	
	
Section
4.05		 
		
Fees and Expenses
		 
		
21
	
	
Section
4.06		 
		
Governing Law
		 
		
21
	
	
Section
4.07		 
		
Jurisdiction
		 
		
21
	
	
Section
4.08		 
		
WAIVER OF JURY TRIAL
		 
		
21
	
	
Section
4.09		 
		
Specific Enforcement
		 
		
22
	
	
Section
4.10		 
		
Counterparts; Effectiveness
		 
		
22
	

i 

	
Section
4.11		 
		
Entire Agreement
		 
		
22
	
	
Section
4.12		 
		
Captions
		 
		
22
	
	
Section
4.13		 
		
Severability
		 
		
22
	
	 
	 
	 
	
Exhibit A: Joinder Agreement
	

ii

     AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

     Amended and Restated Registration Rights Agreement (this “Agreement”) dated as of June 29, 2006 among Ultra Clean Holdings, Inc., a Delaware corporation (the “Company”), FP-Ultra Clean L.L.C. (“FP”),
Leonid and Inna Mezhvinsky as trustees of the Revocable Trust Agreement of Leonid Mezhvinsky and Inna Mezhvinsky dated April 26, 1988 (the “Mezhvinsky Living Trust”), Joe and Jenny Chen as trustees of the Joe Chen and Jenny Chen Revocable Trust dated 2002 (the “Chen Living Trust”), Victor Mezhvinsky, Victor Mezhvinsky as trustee of the Joshua Mezhvinsky 2004 Irrevocable Trust under Agreement dated June 4, 2004 (the “Joshua Trust”), David Hongyu Wu and Winnie Wei Zhen Wu as trustees of the Chen Minors Irrevocable Trust (the “Chen Minors Trust”)
and Frank Moreman. 

W I T N E S S E T H :

     WHEREAS, pursuant to the Agreement and Plan of Merger and Reorganization dated as of June 29, 2006 among Sieger Engineering, Inc., Leonid Mezhvinsky, Ultra Clean Holdings, Inc., Bob Acquisition Inc., Pete Acquisition LLC, the Mezhvinsky Living Trust, the Chen Living
Trust, Victor Mezhvinsky, the Joshua Trust, 2004, the Chen Minors Trust and Frank Moreman (collectively the “Sieger Stockholders”) and Leonid
Mezhvinsky as Sellers’ Agent (the “Merger Agreement”), the Sieger Stockholders have acquired securities of the Company; 

     WHEREAS, the Company, FP and the Sieger Stockholders are entering into an Amended and Restated Stockholders’ Agreement dated as of the date hereof and the Company, Leonid
Mehzvinsky and the Sieger Stockholders are entering into a Lockup Agreement dated as of the date hereof (the “Lockup Agreement”); 

     WHEREAS, the parties hereto desire to enter into this Agreement to govern certain of their rights, duties and obligations after consummation of the transactions contemplated by the
Merger Agreement; 

     WHEREAS, the parties hereto intend this Agreement to amend, supersede and restate in its entirety the Registration Rights Agreement dated as of December 2, 2002 among Ultra Clean
Holdings, Inc., and FP-Ultra Clean L.L.C. (the “Original Registration Rights Agreement”);

     NOW, THEREFORE, in consideration of the covenants and agreements contained herein, the parties hereto agree that the Original Registration Rights Agreement shall be superseded and
amended and restated in its entirety as follows: 

ARTICLE 1 
DEFINITIONS

     Section 1.01. Definitions. (a) The following terms, as used herein, have the following
meanings: 

     “Affiliate” means, with respect to any Person, any other Person directly or
indirectly controlling, controlled by or under common control with such Person, provided that no securityholder of the Company shall be deemed an Affiliate
of any other securityholder solely by reason of any investment in the Company. For the purpose of this definition, the term “control” (including,
with correlative meanings, the terms “controlling”, “controlled by” and “under common control with”), as used with respect to any Person, shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management and policies of such Person, whether through the ownership of voting securities, by contract or otherwise. 

     “Business Day” means any day except a Saturday, Sunday or other day on which
commercial banks in San Francisco, California are authorized by law to close. 

     “Common Stock” means the common stock, par value $0.001 per share, of the
Company and any stock into which such Common Stock may thereafter be converted or changed. 

     “Company Securities” means (i) the Common Stock, (ii) securities convertible
into or exchangeable for Common Stock, (iii) any other equity or equity-linked security issued by the Company and (iv) options, warrants or other rights to acquire Common Stock or any other equity or equity-linked security issued by the Company.

     “Exchange Act” means the Securities Exchange Act of 1934, as amended.

     “First Public Offering” means March 24, 2004. 

     “Mezhvinsky” means, collectively, the Mezhvinsky Living Trust, Victor Mezhvinsky
and the Joshua Trust. 

     “NASD” means the National Association of Securities Dealers, Inc.

     “Person” means an individual, corporation, limited liability company,
partnership, association, trust or other entity or organization, including a government or political subdivision or an agency or instrumentality thereof. 

     “Public Offering” means an underwritten public offering of Registrable
Securities of the Company pursuant to an effective registration statement under the Securities Act. 

2

     “Registrable Securities” means, at any time, any Shares and any securities
issued or issuable in respect of such Shares by way of conversion, exchange, stock dividend, split or combination, recapitalization, merger, consolidation, other reorganization or otherwise until (i) a registration statement covering such Shares has
been declared effective by the SEC and such Shares have been disposed of pursuant to such effective registration statement, (ii) such Shares are sold under circumstances in which all of the applicable conditions of Rule 144 (or any similar
provisions then in force) under the Securities Act are met or such securities may be sold pursuant to Rule 144(k) or (iii) such Shares are otherwise Transferred, the Company has delivered a new certificate or other evidence of ownership for such
Shares not bearing the legend required pursuant to this Agreement and such Shares may be resold without subsequent registration under the Securities Act. 

     “Registration Expenses” means any and all expenses incident to the performance
of or compliance with any registration or marketing of securities, including all (i) registration and filing fees, and all other fees and expenses payable in connection with the listing of securities on any securities exchange or automated
interdealer quotation system, (ii) fees and expenses of compliance with any securities or “blue sky” laws (including reasonable fees and disbursements of counsel in connection with “blue sky” qualifications of the securities
registered), (iii) expenses in connection with the preparation, printing, mailing and delivery of any registration statements, prospectuses and other documents in connection therewith and any amendments or supplements thereto, (iv) security
engraving and printing expenses, (v) internal expenses of the Company (including, without limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), (vi) reasonable fees and disbursements of counsel
for the Company and customary fees and expenses for independent certified public accountants retained by the Company (including the expenses relating to any comfort letters or costs associated with the delivery by independent certified public
accountants of any comfort letters requested pursuant to Section 2.03(h)), (vii) reasonable fees and expenses of any special experts retained by the Company in connection with such registration, (viii) reasonable fees, out-of-pocket costs and
expenses of the Stockholders, including one counsel for all of the Stockholders participating in the offering selected by the Stockholders holding the majority of the Registrable Securities to be sold for the account of all Stockholders in the
offering, (ix) fees and expenses in connection with any review by the NASD of the underwriting arrangements or other terms of the offering, and all fees and expenses of any “qualified independent underwriter,” including the fees and
expenses of any counsel thereto, (x) fees and disbursements of underwriters customarily paid by issuers or sellers of securities, but excluding any underwriting fees, discounts and commissions attributable to the sale of Registrable Securities, (xi)
costs of printing and producing any agreements among underwriters, underwriting agreements, any “blue sky” or legal investment memoranda and any selling agreements and other documents in connection with the offering, sale or delivery of
the Registrable Securities, (xii) transfer agents’ 

3

     and registrars’ fees and expenses and the fees and expenses of any other agent or trustee appointed in connection with such offering, (xiii) expenses relating to any analyst or investor presentations or any
“road shows” undertaken in connection with the registration, marketing or selling of the Registrable Securities, (xiv) fees and expenses payable in connection with any ratings of the Registrable Securities, including expenses relating to
any presentations to rating agencies and (xv) all out-of pocket costs and expenses incurred by the Company or its appropriate officers in connection with their compliance with Section 2.03(m).

     “Requesting Stockholder” means a Stockholder requesting a Demand Registration
pursuant to Section 2.01 hereof. 

     “Rule 144” means Rule 144 (or any successor provisions) under the Securities
Act. 

     “SEC” means the Securities and Exchange Commission. 

     “Securities Act” means the Securities Act of 1933, as amended. 

     “Shares” means
    shares of Common Stock. 

     “Stockholder” means at any time, any Person (other than the Company) who shall
then be a party to or bound by this Agreement, so long as such Person shall “beneficially own” (as such term is defined in Rule 13d-3 of the Exchange Act) any Company Securities. 

     “Subsidiary” means, with respect to any Person, any entity of which securities
or other ownership interests having ordinary voting power to elect a majority of the board of directors or other persons performing similar functions are at the time directly or indirectly owned by such Person. 

     “Transfer” means, with respect to any Company Securities, (i) when used as a
verb, to sell, assign, dispose of, exchange, pledge, encumber, hypothecate or otherwise transfer such Company Securities or any participation or interest therein, whether directly or indirectly, or agree or commit to do any of the foregoing and (ii)
when used as a noun, a direct or indirect sale, assignment, disposition, exchange, pledge, encumbrance, hypothecation, or other transfer of such Company Securities or any participation or interest therein or any agreement or commitment to do any of
the foregoing. 

     (b) Each of the following terms is defined in the
Section set forth opposite such term: 

  	
    Term
      	 
      	
        Section
        

	
    Company
      	 
      	
        Preamble
        

	
    Damages
      	 
      	
        2.04
        

	
    Demand Registration
      	 
      	
        2.01(c)
        

  

4 

  

  	
    Term
      	 
      	
    Section
      
	
    Indemnified Party
      	 
      	
    2.06
      
	
    Indemnifying Party
      	 
      	
    2.06
      
	
    Inspectors
      	 
      	
    2.03(g)
      
	
    Lockup Period
      	 
      	
    2.03
      
	
    Maximum Offering Size
      	 
      	
    2.01(g)
      
	
    Piggyback Registration
      	 
      	
    2.02(a)
      
	
    Records
      	 
      	
    2.03(g)
      
	
    Registering Stockholders
      	 
      	
    2.01(c)(ii)
      
	
    Requesting Stockholder
      	 
      	
    2.01(a)
      

ARTICLE 2 

REGISTRATION 
RIGHTS 

     Section 2.01. Demand Registration. (a) If at any time the Company shall receive a request
from FP; or

     (b) if at any time (but only once and provided the
right in subsection (c) below has not previously been exercised) during the period beginning on June 29, 2008 and ending on December 29, 2009, the Company shall receive a request from Leonid Mezhvinsky as agent for the Sieger Stockholders; or

     (c) if at any time following the later of (i)
December 29, 2006 and (ii) the day Leonid Mezhvinsky becomes a Non-Employee (as defined herein) (but only once, and provided the right in subsection (b)
above has not been exercised, and provided further that Leonid Mezhvinsky has ceased to be (A) an employee or (B) a director, provided that he has not
ceased to be a director either because he was not elected by the Company's stockholders after having been nominated to stand for election or because he declined to stand for election (in either A or B, a “Non-Employee”), of the Company) at any time during the period beginning on the date hereof and ending on June 28, 2008, the Company shall receive a request from Leonid Mezhvinsky as
agent for the Sieger Stockholders that the Company effect the registration under the Securities Act of all or any portion of such Requesting Stockholder’s Registrable Securities (provided however, that any sales made pursuant to a request
under Section 2.01(c) may only be effected up to the maximum number of shares that may be sold pursuant to Section 3 of the Lockup Agreement), and specifying the intended method of disposition thereof, then the Company shall promptly give notice of
such requested registration (each such request shall be referred to herein as a “Demand Registration”) at least 15 Business Days prior to the
anticipated filing date of the registration statement relating to such Demand Registration to the other Stockholders and thereupon shall use all reasonable efforts to effect, as expeditiously as possible, the registration under the Securities Act
of: 

5

        (i) all Registrable Securities for which the Requesting Stockholder has requested
    registration under this Section 2.01, and

        (ii) subject to the restrictions set forth in Sections 2.01(g) and 2.02, all other
    Registrable Securities of the same class as those requested to be registered by the Requesting Stockholder that any other Stockholders with rights to request registration under Section 2.02 (all such Stockholders, together with the Requesting
    Stockholder, the “Registering Stockholders”) have requested the Company to register by request received by the Company within 15 Business Days
    after such Stockholders receive the Company’s notice of the Demand Registration, 

all to the extent necessary to permit the disposition (in accordance with the intended methods thereof as aforesaid) of the Registrable Securities so to be registered, provided that the Company shall not be obligated to effect a Demand Registration unless the aggregate gross proceeds expected to be received from the sale of the Registrable Securities
requested to be included in such Demand Registration equals or exceeds $5,000,000, and provided, further, that the Company shall not be required to effect a Demand Registration pursuant to subsection (b) hereof pursuant to Rule 415 (or its successor provision) and provided, further,
that a registration pursuant to subsection (c) shall be, if so requested, pursuant to Rule 415 (or its successor provision) under the Securities Act. In no event shall the Company be required to effect more than one Demand Registration hereunder
within any ninety day period. 

     (d) Promptly after the expiration of the
15-Business Day period referred to in Section 2.01(c)(ii), the Company will notify all Registering Stockholders of the identities of the other Registering Stockholders and the number of shares of Registrable Securities requested to be included
therein. At any time prior to the effective date of the registration statement relating to such registration, the Requesting Stockholders may revoke such request, without liability to any of the other Registering Stockholders, by providing a notice
to the Company revoking such request.

     (e) The Company shall be liable for and pay all
Registration Expenses in connection with any Demand Registration, regardless of whether such Registration is effected. 

     (f) A Demand Registration shall not be deemed to have occurred: 

        (i) unless the registration statement relating thereto (A) has become effective under
    the Securities Act and (B) has remained effective for a period of at least 180 days (or such shorter period in which all Registrable Securities of the Registering Stockholders included in such registration have actually been sold thereunder),
    provided that such registration statement shall not be considered a Demand Registration if, after such registration statement becomes effective, (1) such
    registration 

6

  statement is interfered with by any stop order, injunction or other order or requirement of the SEC or other governmental agency or court and (2) less than 75% of the Registrable Securities included in such
    registration statement have been sold thereunder; or 

        (ii) if the Maximum Offering Size is reduced in accordance with Section 2.01(g) such
    that less than 66 2 / 3 % of the Registrable Securities of the Requesting Stockholders sought to be included in such
    registration are included. 

     (g) If a Demand Registration involves an
underwritten Public Offering and the managing underwriter advises the Company and the Requesting Stockholders that, in its view, the number of shares of Registrable Securities requested to be included in such registration (including any securities
that the Company proposes to be included that are not Registrable Securities) exceeds the largest number of shares that can be sold without having an adverse effect on such offering, including the price at which such shares can be sold (the
“Maximum Offering Size”), the Company shall include in such registration, in the priority listed below, up to the Maximum Offering Size:

        (i) First, all Registrable Securities requested to be registered by the Requesting
    Stockholder; 

        (ii) second, all other Registrable Securities requested to be included in such
    registration by any Registering Stockholder (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among such other Stockholders on the basis of the relative number of Registrable Securities so requested to be
    included in such registration by each such Stockholder); and 

        (iii) third, any securities proposed to be registered by the Company. 

     (h) Upon notice to each Requesting Stockholder, the
Company may postpone effecting a registration pursuant to this Section 2.01 on one occasion during any period of twelve consecutive months for a reasonable time specified in the notice but not exceeding 60 days (which period may not be extended or
renewed), if (i) an investment banking firm of recognized national standing shall advise the Company and the Requesting Stockholders in writing that effecting the registration would materially and adversely affect an offering of securities of such
Company the preparation of which had then been commenced or (ii) the Company is in possession of material non-public information the disclosure of which during the period specified in such notice the Company reasonably believes would not be in the
reasonable interests of the Company. 

     Section 2.02. Piggyback Registration. (a) If at any time the Company proposes to register
any Company Securities under the Securities Act (other than 

7

a registration on Form S-8 or S-4, or any successor forms, relating to Common Stock issuable upon exercise of employee stock options or in connection with any employee benefit or similar plan of the Company or in
connection with a direct or indirect acquisition by the Company of another Person), whether or not for sale for its own account, the Company shall each such time give notice at least 30 Business Days prior to the anticipated filing date of the
registration statement relating to such registration to each Stockholder, which notice shall set forth such Stockholder’s rights under this Section 2.02 and shall offer such Stockholder the opportunity to include in such registration statement
the number of Registrable Securities of the same class or series as those proposed to be registered as each such Stockholder may request (a “Piggyback Registration”), subject to the provisions of Section 2.02(b) . Upon the request of any such Stockholder made within 15 Business Days after the receipt of notice from the Company (which request shall specify the number of Registrable Securities
intended to be registered by such Stockholder), the Company shall use its reasonable efforts to effect the registration under the Securities Act of all Registrable Securities that the Company has been so requested to register by all such
Stockholders, to the extent requisite to permit the disposition of the Registrable Securities to be so registered, provided that (i) if such registration
involves an underwritten Public Offering, all such Stockholders requesting to be included in the Company’s registration must sell their Registrable Securities to the underwriters selected as provided herein on the same terms and conditions as
apply to the Company or the Requesting Stockholders, as applicable, and (ii) if, at any time after giving notice of its intention to register any Company Securities pursuant to this Section 2.02(a) and prior to the effective date of the registration
statement filed in connection with such registration, the Company shall determine for any reason not to register such securities, the Company shall give notice to all such Stockholders and, thereupon, shall be relieved of its obligation to register
any Registrable Securities in connection with such registration. No registration effected under this Section 2.02 shall relieve the Company of its obligations to effect a Demand Registration to the extent required by Section 2.01. The Company shall
pay all Registration Expenses in connection with each Piggyback Registration. 

     (b) If a Piggyback Registration involves an
underwritten Public Offering (other than any Demand Registration, in which case the provisions with respect to priority of inclusion in such offering set forth in Section 2.01(g) shall apply) and the managing underwriter advises the Company that, in
its view, the number of Shares that the Company and such Stockholders intend to include in such registration exceeds the Maximum Offering Size, the Company shall include in such registration, in the following priority, up to the Maximum Offering
Size: 

        (i) first, so much of the Company Securities proposed to be registered for the account
    of the Company as would not cause the offering to exceed the Maximum Offering Size; and 

8

        (ii) second, all Registrable Securities requested to be included in such registration
    by any other Stockholders pursuant to Section 2.02 (allocated, if necessary for the offering not to exceed the Maximum Offering Size, pro rata among such Stockholders on the basis of the relative number of shares of Registrable Securities so
    requested to be included in such registration by each). 

     Section 2.03. Registration Procedures. Whenever Stockholders request that any Registrable
Securities be registered pursuant to Section 2.01 or 2.02, subject to the provisions of such Sections, the Company shall use its reasonable efforts to effect the registration and the sale of such Registrable Securities in accordance with the
intended method of disposition thereof as quickly as practicable, and, in connection with any such request: 

     (a) The Company shall as expeditiously as possible
prepare and file with the SEC a registration statement on any form for which the Company then qualifies or that counsel for the Company shall deem appropriate and which form shall be available for the sale of the Registrable Securities to be
registered thereunder in accordance with the intended method of distribution thereof, and use its reasonable efforts to cause such filed registration statement to become and remain effective for a period of not less than 180 days, or in the case of
a shelf registration statement, one year (or such shorter period in which all of the Registrable Securities of the Registering Stockholders included in such registration statement shall have actually been sold thereunder). 

     (b) Prior to filing a registration statement or
prospectus or any amendment or supplement thereto, the Company shall, if requested, furnish to each participating Stockholder and each underwriter, if any, of the Registrable Securities covered by such registration statement copies of such
registration statement as proposed to be filed, and thereafter the Company shall furnish to such Stockholder and underwriter, if any, such number of copies of such registration statement, each amendment and supplement thereto (in each case including
all exhibits thereto and documents incorporated by reference therein), the prospectus included in such registration statement (including each preliminary prospectus and any summary prospectus) and any other prospectus filed under Rule 424 or Rule
430A under the Securities Act and such other documents as such Stockholder or underwriter may reasonably request in order to facilitate the disposition of the Registrable Securities owned by such Stockholder. Each participating Stockholder shall
have the right to request that the Company modify any information contained in such registration statement, amendment and supplement thereto pertaining to such Stockholder and the Company shall use its reasonable efforts to comply with such request,
provided, however, that the Company shall not have any obligation to so modify any information if the Company reasonably expects that so doing would cause
the prospectus to contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading. 

9

     (c) After the filing of the registration statement,
the Company shall (i) cause the related prospectus to be supplemented by any required prospectus supplement, and, as so supplemented, to be filed pursuant to Rule 424 under the Securities Act, (ii) comply with the provisions of the Securities Act
with respect to the disposition of all Registrable Securities covered by such registration statement during the applicable period in accordance with the intended methods of disposition by the Registering Stockholders thereof set forth in such
registration statement or supplement to such prospectus and (iii) promptly notify each Registering Stockholder holding Registrable Securities covered by such registration statement of any stop order issued or threatened by the SEC or any state
securities commission and take all reasonable actions required to prevent the entry of such stop order or to remove it if entered. 

     (d) The Company shall use its reasonable efforts to
(i) register or qualify the Registrable Securities covered by such registration statement under such other securities or “blue sky” laws of such jurisdictions in the United States as any Registering Stockholder holding such Registrable
Securities reasonably (in light of such Stockholder’s intended plan of distribution) requests and (ii) cause such Registrable Securities to be registered with or approved by such other governmental agencies or authorities as may be necessary by
virtue of the business and operations of the Company and do any and all other acts and things that may be reasonably necessary or advisable to enable such Stockholder to consummate the disposition of the Registrable Securities owned by such
Stockholder, provided that the Company shall not be required to (A) qualify generally to do business in any jurisdiction where it would not otherwise be
required to qualify but for this Section 2.03(d), (B) subject itself to taxation in any such jurisdiction or (C) consent to general service of process in any such jurisdiction. 

     (e) The Company shall immediately notify each
Registering Stockholder holding such Registrable Securities covered by such registration statement, at any time when a prospectus relating thereto is required to be delivered under the Securities Act, of the occurrence of an event requiring the
preparation of a supplement or amendment to such prospectus so that, as thereafter delivered to the purchasers of such Registrable Securities, such prospectus will not contain an untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein not misleading and promptly prepare and make available to each such Stockholder and file with the SEC any such supplement or amendment. 

     (f) (i) FP shall have the right, in its sole
discretion, to select an underwriter or underwriters in connection with any Public Offering resulting from the exercise by FP of a Demand Registration, which underwriter or underwriters may include any Affiliate of FP and (ii) the Company shall
select an underwriter or underwriters in connection with any other Public Offering, which underwriter or underwriters shall be reasonably acceptable to the Requesting Stockholder. In 

10

connection with any Public Offering, the Company shall enter into customary agreements (including an underwriting agreement in customary form) and take such all other actions as are required in order to expedite
or facilitate the disposition of such Registrable Securities in any such Public Offering, including the engagement of a “qualified independent underwriter” in connection with the qualification of the underwriting arrangements with the
NASD. 

     (g) Upon execution of confidentiality agreements in
form and substance reasonably satisfactory to the Company, the Company shall make available for inspection by any Registering Stockholder and any underwriter participating in any disposition pursuant to a registration statement being filed by the
Company pursuant to this Section 2.03 and any attorney, accountant or other professional retained by any such Stockholder or underwriter (collectively, the “Inspectors”), all financial and other records, pertinent corporate documents and properties of the Company (collectively, the “Records”) as shall be reasonably necessary or desirable to enable them to exercise their due diligence responsibility, and cause the Company’s officers, directors and employees to supply all information reasonably requested by any
Inspectors in connection with such registration statement. Records that the Company determines, in good faith, to be confidential and that it notifies the Inspectors are confidential shall not be disclosed by the Inspectors unless (i) the disclosure
of such Records is necessary to avoid or correct a misstatement or omission in such registration statement or (ii) the release of such Records is ordered pursuant to a subpoena or other order from a court of competent jurisdiction. Each Registering
Stockholder agrees that information obtained by it as a result of such inspections shall be deemed confidential and shall not be used by it or its Affiliates as the basis for any market transactions in the Company Securities unless and until such
information is made generally available to the public. Each Registering Stockholder further agrees that, upon learning that disclosure of such Records is sought in a court of competent jurisdiction, it shall give notice to the Company and allow the
Company, at its expense, to undertake appropriate action to prevent disclosure of the Records deemed confidential. 

     (h) The Company shall furnish to each Registering
Stockholder and to each such underwriter, if any, a signed counterpart, addressed to such Stockholder or underwriter, of (i) an opinion or opinions of counsel to the Company and (ii) a comfort letter or comfort letters from the Company’s
independent public accountants, each in customary form and covering such matters of the kind customarily covered by opinions or comfort letters, as the case may be, as a majority of such Stockholders or the managing underwriter therefor reasonably
requests. 

     (i) The Company shall otherwise use its reasonable
efforts to comply with all applicable rules and regulations of the SEC, and make available to its security holders, as soon as reasonably practicable, an earnings statement or such other document covering a period of 12 months, beginning within
three months 

11

after the effective date of the registration statement, which earnings statement shall satisfy the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder. 

     (j) The Company may require each such Registering
Stockholder promptly to furnish in writing to the Company such information regarding the distribution of the Registrable Securities as the Company may from time to time reasonably request and such other information as may be legally required in
connection with such registration. 

     (k) Each such Registering Stockholder agrees that,
upon receipt of any notice from the Company of the happening of any event of the kind described in Section 2.03(e), such Stockholder shall forthwith discontinue disposition of Registrable Securities pursuant to the registration statement covering
such Registrable Securities until such Stockholder’s receipt of the copies of the supplemented or amended prospectus contemplated by Section 2.03(e), and, if so directed by the Company, such Stockholder shall deliver to the Company all copies,
other than any permanent file copies then in such Stockholder’s possession, of the most recent prospectus covering such Registrable Securities at the time of receipt of such notice. If the Company shall give such notice, the Company shall
extend the period during which such registration statement shall be maintained effective (including the period referred to in Section 2.03(a)) by the number of days during the period from and including the date of the giving of notice pursuant to
Section 2.03(e) to the date when the Company shall make available to such Stockholder a prospectus supplemented or amended to conform with the requirements of Section 2.03(e). 

     (l) The Company shall use its reasonable efforts to
list all Registrable Securities covered by such registration statement on any securities exchange or quotation system on which any of the Registrable Securities are then listed or traded. 

     (m) The Company shall have appropriate officers of
the Company (i) prepare and make presentations at any “road shows” and before analysts and rating agencies, as the case may be, (ii) take other actions to obtain ratings for any Registrable Securities and (iii) otherwise use their
reasonable efforts to cooperate as reasonably requested by the underwriters in the offering, marketing or selling of the Registrable Securities. 

     Section 2.04. Indemnification by the Company. The Company agrees to indemnify and hold
harmless each Registering Stockholder holding Registrable Securities covered by a registration statement, its officers, directors, employees, partners and agents, and each Person, if any, who controls such Stockholder within the meaning of Section
15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages, liabilities and expenses (including reasonable expenses of investigation and reasonable 

12

attorneys’ fees and expenses) (“Damages”) caused by or relating to any untrue statement or alleged untrue
statement of a material fact contained in any registration statement or prospectus relating to the Registrable Securities (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto) or any preliminary
prospectus, or caused by or relating to any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such Damages are caused by or
related to any such untrue statement or omission or alleged untrue statement or omission so made based upon information furnished in writing to the Company by such Stockholder or on such Stockholder’s behalf expressly for use therein,
provided that, with respect to any untrue statement or omission or alleged untrue statement or omission made in any preliminary prospectus, or in any
prospectus, as the case may be, the indemnity agreement contained in this paragraph shall not apply to the extent that any Damages result from the fact that a current copy of the prospectus (or such amended or supplemented prospectus, as the case
may be) was not sent or given to the Person asserting any such Damages at or prior to the written confirmation of the sale of the Registrable Securities concerned to such Person if it is determined that the Company has provided such prospectus to
such Stockholder and it was the responsibility of such Stockholder to provide such Person with a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) and such current copy of the prospectus (or such amended
or supplemented prospectus, as the case may be) would have cured the defect giving rise to such Damages. The Company also agrees to indemnify any underwriters of the Registrable Securities, their officers and directors and each Person who controls
such underwriters within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act on substantially the same basis as that of the indemnification of the Stockholders provided in this Section 2.04. 

     Section 2.05. Indemnification by Participating Stockholders. Each Registering Stockholder
holding Registrable Securities included in any registration statement agrees, severally but not jointly, to indemnify and hold harmless the Company, its officers, directors and agents and each Person, if any, who controls the Company within the
meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to such Stockholder, but only (i) with respect to information furnished in writing by such
Stockholder or on such Stockholder’s behalf expressly for use in any registration statement or prospectus relating to the Registrable Securities, or any amendment or supplement thereto, or any preliminary prospectus or (ii) to the extent that
any Damages result from the fact that a current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) was not sent or given to the Person asserting any such Damages at or prior to the written confirmation of the
sale of the Registrable Securities concerned to such Person if it is determined that it was the responsibility of such Stockholder to provide such Person with a current copy of the prospectus (or such amended or supplemented prospectus, as the case
may be) 

13

and such current copy of the prospectus (or such amended or supplemented prospectus, as the case may be) would have cured the defect giving rise to such loss, claim, damage, liability or expense. Each such
Stockholder also agrees to indemnify and hold harmless underwriters of the Registrable Securities, their officers and directors and each Person who controls such underwriters within the meaning of either Section 15 of the Securities Act or Section
20 of the Exchange Act on substantially the same basis as that of the indemnification of the Company provided in this Section 2.05. As a condition to including Registrable Securities in any registration statement filed in accordance with Article 2,
the Company may require that it shall have received an undertaking reasonably satisfactory to it from any underwriter to indemnify and hold it harmless to the extent customarily provided by underwriters with respect to similar securities. No
Registering Stockholder shall be liable under this Section 2.05 for any Damages in excess of the net proceeds realized by such Stockholder in the sale of Registrable Securities of such Stockholder to which such Damages relate. 

     Section 2.06. Conduct of Indemnification Proceedings. If any proceeding (including any
governmental investigation) shall be instituted involving any Person in respect of which indemnity may be sought pursuant to this Article 2, such Person (an “Indemnified Party”) shall promptly notify the Person against whom such indemnity may be sought (the “Indemnifying Party”) in
writing and the Indemnifying Party shall assume the defense thereof, including the employment of counsel reasonably satisfactory to such Indemnified Party, and shall assume the payment of all fees and expenses, 
provided that the failure of any Indemnified Party so to notify the Indemnifying Party shall not relieve the Indemnifying Party of its obligations hereunder except to the extent that the
Indemnifying Party is materially prejudiced by such failure to notify. In any such proceeding, any Indemnified Party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such
Indemnified Party unless (i) the Indemnifying Party and the Indemnified Party shall have mutually agreed to the retention of such counsel or (ii) in the reasonable judgment of such Indemnified Party representation of both parties by the same counsel
would be inappropriate due to actual or potential differing interests between them. It is understood that, in connection with any proceeding or related proceedings in the same jurisdiction, the Indemnifying Party shall not be liable for the
reasonable fees and expenses of more than one separate firm of attorneys (in addition to any local counsel) at any time for all such Indemnified Parties, and that all such fees and expenses shall be reimbursed as they are incurred. In the case of
any such separate firm for the Indemnified Parties, such firm shall be designated in writing by the Indemnified Parties. The Indemnifying Party shall not be liable for any settlement of any proceeding effected without its written consent, but if
settled with such consent, or if there be a final judgment for the plaintiff, the Indemnifying Party shall indemnify and hold harmless such Indemnified Parties from and against any loss or liability (to the extent stated above) by reason of such
settlement or judgment. Without the prior written consent of the Indemnified Party, no Indemnifying Party shall effect any 

14

settlement of any pending or threatened proceeding in respect of which any Indemnified Party is or could have been a party and indemnity could have been sought hereunder by such Indemnified Party, unless such
settlement includes an unconditional release of such Indemnified Party from all liability arising out of such proceeding. 

     Section 2.07. Contribution. If the indemnification provided for in this Article 2 is
unavailable to the Indemnified Parties in respect of any Damages, then each such Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such Damages
(i) as between the Company and the Registering Stockholders holding Registrable Securities covered by a registration statement on the one hand and the underwriters on the other, in such proportion as is appropriate to reflect the relative benefits
received by the Company and such Stockholders on the one hand and the underwriters on the other, from the offering of the Registrable Securities, or if such allocation is not permitted by applicable law, in such proportion as is appropriate to
reflect not only the relative benefits but also the relative fault of the Company and such Stockholders on the one hand and of such underwriters on the other in connection with the statements or omissions that resulted in such Damages, as well as
any other relevant equitable considerations and (ii) as between the Company on the one hand and each such Stockholder on the other, in such proportion as is appropriate to reflect the relative fault of the Company and of each such Stockholder in
connection with such statements or omissions, as well as any other relevant equitable considerations. The relative benefits received by the Company and such Stockholders on the one hand and such underwriters on the other shall be deemed to be in the same proportion as the total proceeds from the offering (net of underwriting discounts and commissions but before
deducting expenses) received by the Company and such Stockholders bear to the total underwriting discounts and commissions received by such underwriters, in each case as set forth in the table on the cover page of the prospectus. The relative fault
of the Company and such Stockholders on the one hand and of such underwriters on the other shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission
to state a material fact relates to information supplied by the Company and such Stockholders or by such underwriters. The relative fault of the Company on the one hand and of each such Stockholder on the other shall be determined by reference to,
among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by such party, and the parties’ relative intent, knowledge,
access to information and opportunity to correct or prevent such statement or omission. 

     The Company and the Registering Stockholders agree that it would not be just and equitable if contribution pursuant to this Section 2.07 were determined by pro rata allocation (even
if the underwriters were treated as one entity for such 

15

purpose) or by any other method of allocation that does not take account of the equitable considerations referred to in the immediately preceding paragraph. The amount paid or payable by an Indemnified Party as a
result of the Damages referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such Indemnified Party in connection with
investigating or defending any such action or claim. Notwithstanding the provisions of this Section 2.07, no underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities
underwritten by it and distributed to the public were offered to the public exceeds the amount of any Damages that such underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged
omission, and no Registering Stockholder shall be required to contribute any amount in excess of the amount by which the total price at which the Registrable Securities of such Stockholder were offered to the public (less underwriters’
discounts and commissions) exceeds the amount of any Damages that such Stockholder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No Person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. Each Registering Stockholder’s obligation to contribute
pursuant to this Section 2.07 is several in the proportion that the proceeds of the offering received by such Stockholder bears to the total proceeds of the offering received by all such Registering Stockholders and not joint. 

     Section 2.08. Participation in Public Offering. No Person may participate in any Public
Offering hereunder unless such Person (a) agrees to sell such Person’s securities on the basis provided in any underwriting arrangements approved by the Persons entitled hereunder to approve such arrangements and (b) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements and the provisions of this Agreement in respect of registration rights. 

     Section 2.09. Other Indemnification. Indemnification similar to that specified herein
(with appropriate modifications) shall be given by the Company and each Registering Stockholder participating therein with respect to any required registration or other qualification of securities under any federal or state law or regulation or
governmental authority other than the Securities Act. 

     Section 2.10. Cooperation by the Company. If any Stockholder shall transfer any
Registrable Securities pursuant to Rule 144, the Company shall cooperate, to the extent commercially reasonable, with such Stockholder and shall provide to such Stockholder such information as such Stockholder shall reasonably request. 

16

     Section 2.11. No Transfer of Registration Rights. None of the rights of Stockholders under
this Article 2 shall be assignable by any Stockholder to any Person acquiring Securities in any Public Offering or pursuant to Rule 144. 

ARTICLE 3

CERTAIN COVENANTS AND 
AGREEMENTS

     Section 3.01. Reports. The Company agrees to furnish FP, for so long as FP owns any
Company Securities: 

     (a) as soon as practicable and, in any event within
20 days after the end of each month, the unaudited consolidated balance sheet of the Company and its Subsidiaries as at the end of such month and the related unaudited statement of operations and cash flow for such month, and for the portion of the
fiscal year then ended, in each case prepared in accordance with GAAP, setting forth in comparative form the figures for the corresponding month and portion of the previous fiscal year, and the figures for the corresponding month and portion of the
then current fiscal year as in the Company’s annual operating budget, 

     (b) as soon as practicable and, in any event,
within 45 days after the end of each of the first three fiscal quarters, the unaudited consolidated balance sheet of the Company and its Subsidiaries as at the end of such quarter and the related unaudited statement of operations and cash flow for
such quarter and for the portion of the fiscal year then ended, in each case prepared in accordance with GAAP, 

     (c) as soon as practicable and, in any event,
within 90 days after the end of each fiscal year, (i) the audited consolidated balance sheet of the Company and its Subsidiaries as at the end of such fiscal year and the related audited statement of operations and cash flow for such fiscal year,
and for the portion of the fiscal year then ended, in each case prepared in accordance with GAAP and certified by Deloitte & Touche or another firm of independent public accountants of nationally recognized standing, together with a comparison
of the figures in such financial statements with the figures for the previous fiscal year and the figures in the Company’s annual operating budget, (ii) any management letters or other correspondence from such accountants and (iii) the
Company’s annual operating budget for the coming fiscal year, 

     (d) promptly following the preparation thereof, a
copy of any revisions to the annual operating budget delivered pursuant to clause (c) above, 

     (e) promptly upon their becoming available, copies
of (i) all financial statements, reports, notices and proxy statements sent or made generally available by the Company to any of its security holders, (ii) all regular and periodic reports and all registration statements and prospectuses filed by
the Company with any 

17

securities exchange or with the SEC and (iii) all press releases and other statements made generally available by the Company to the public, 

     (f) as soon as practicable and, in any event,
within five Business Days after any officer of the Company obtains knowledge thereof, notice (with a description in reasonable detail, and stating the action that the Company is taking or proposes to take with respect thereto) of (i) the
commencement of any material litigation, investigation or other proceeding to which the Company or any of its Subsidiaries is a party before any court or arbitrator or any governmental body, agency or official or (ii) the existence of any material
default or breach under this Agreement or any other material contract or agreement to which the Company or any of its Subsidiaries is a party, and 

     (g) as promptly as reasonably practicable, such
other information with respect to the Company or any of its Subsidiaries as may reasonably be requested by FP. 

     Section 3.02. Limitations on Subsequent Registration Rights. The Company agrees that it
shall not enter into any agreement with any holder or prospective holder of any securities of the Company (a) that would allow such holder or prospective holder to include such securities in any Demand Registration or Piggyback Registration unless,
under the terms of such agreement, such holder or prospective holder may include such securities in any such registration only to the extent that their inclusion would not reduce the amount of the Registrable Securities of the Stockholders included
therein or (b) on terms otherwise more favorable than this Agreement. The Company also represents and warrants to each Stockholder that it has not previously entered into any agreement with respect to any of its securities granting any registration
rights to any Person other than the Original Registration Rights Agreement. 

     Section 3.03. Conflicting Agreements. The Company represents and agrees that it shall not
(a) grant any proxy or enter into or agree to be bound by any voting trust or agreement with respect to the Company Securities, except as expressly contemplated by this Agreement, (b) enter into any agreement or arrangement of any kind with any
Person with respect to its Company Securities inconsistent with the provisions of this Agreement or for the purpose or with the effect of denying or reducing the rights of any other Stockholder under this Agreement, including agreements or
arrangements with respect to the Transfer or voting of its Company Securities or (c) act, for any reason, as a member of a group or in concert with any other Person in connection with the Transfer or voting of its Company Securities in any manner
that is inconsistent with the provisions of this Agreement. 

18

ARTICLE 4

MISCELLANEOUS

     Section 4.01. Lockup Agreement. Any rights granted to Mezhvinsky hereunder are granted and
made expressly subject to the Lockup Agreement and the Company shall not be required to take any action which contravenes the terms of such Lockup Agreement. 

     Section 4.02. Binding Effect; Assignability; Benefit. (a) This Agreement shall inure to
the benefit of and be binding upon the parties hereto and their respective heirs, successors, legal representatives and permitted assigns. 

     (b) Neither this Agreement nor any right, remedy,
obligation or liability arising hereunder or by reason hereof shall be assignable by any party hereto pursuant to any Transfer of Company Securities or otherwise, except that, (i) at the sole written election of FP, Persons to whom FP has
Transferred Company Securities may (unless already bound hereby) execute and deliver to the Company an agreement to be bound by this Agreement in the form of Exhibit A hereto and shall thenceforth be a “Stockholder” for purposes of, and
have the rights of a Stockholder under, this Agreement and (ii) following the Transfer of Company Securities by a Sieger Stockholder to a transferee that is such Stockholder’s Affiliate, spouse, ex-spouse, domestic partner, lineal descendant or
antecedent, brother or sister, the adopted child or adopted grandchild, or the spouse or domestic partner of any child, grandchild or adopted grandchild of such Stockholder, trust for the benefit of such Stockholder or those members of such
Stockholder’s family specified in this subsection (b), such Transferee may (unless already bound hereby) execute and deliver to the Company an agreement to be bound by this Agreement in the form of Exhibit A hereto and shall thenceforth be a
“Sieger Stockholder” for purposes of, and have the rights of a “Sieger Stockholder” under, this Agreement, provided that any such
Transfer pursuant to this subparagraph (ii) must be in accordance with the Lockup Agreement. 

     (c) Nothing in this Agreement, expressed or
implied, is intended to confer on any Person other than the parties hereto, and their respective heirs, successors, legal representatives and permitted assigns, any rights, remedies, obligations or liabilities under or by reason of this Agreement.

     Section 4.03. Notices. All notices, requests and other communications to any party shall
be in writing and shall be delivered in person, mailed by certified or registered mail, return receipt requested, or sent by facsimile transmission, 

19

	 	if to the Company to: 
	 	 
	 	        Ultra
        Clean Holdings, Inc. 
	 	        150
        Independence Drive 
	 	        Menlo
        Park, CA 94025 
	 	        Attention: Chief Financial
        Officer 
	 	        Fax:
        650-326-0929 
	 	 
	 	if to FP, to: 
	 	 
	 	        FP – Ultra
        Clean, L.L.C. 
	 	        2882 Sand Hill Road,
        Suite 280 
	 	        Menlo
        Park, CA 94025 
	 	        Attention:
        Dipanjan Deb 
	 	        Fax:
        650-233-2999 
	 	 
	 	        with
        a copy to: 
	 	 
	 	        Davis
        Polk & Wardwell 
	 	        1600
        El Camino Real 
	 	        Menlo
        Park, CA 94025 
	 	        Attention:
        Alan Denenberg 
	 	        Fax:
        (650) 752-2111 
	 	 
	 	if to Mezhvinsky or
        the Sieger Stockholders, to: 
	 	 
	 	        Sieger
        Engineering, Inc. 
	 	        130
        Beacon Street 
	 	        South San Francisco,
        CA 94080 
	 	        Attention: Leonid
        Mezhvinsky 
	 	        Facsimile No.: (650)
        583-5823 
	 	 
	 	        with
        a copy to: 
	 	 
	 	        Wilson Sonsini Goodrich & Rosati 
	 	        Professional
        Corporation 
	 	        One
        Market, Spear Tower, Suite 3300 
	 	        San
        Francisco, CA 94105 
	 	        Attention:
        Robert T. Ishii 
	 	        Facsimile No.: (415)
        947-2099 

     All notices, requests and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 p.m. in the place of receipt and such
day is a Business Day in the place of receipt. Otherwise, any such notice, request or communication shall be deemed not to have been received until the next succeeding Business Day in the place of receipt. Any notice, request or other written
communication sent by facsimile transmission 

20

shall be confirmed by certified or registered mail, return receipt requested, posted within one Business Day, or by personal delivery, whether courier or otherwise, made within two Business Days after the date of
such facsimile transmissions. 

     Any Person that becomes a Stockholder shall provide its address and fax number to the Company. 

     Section 4.04. Waiver; Amendment; Termination. No provision of this Agreement may be waived
except by an instrument in writing executed by the party against whom the waiver is to be effective. No provision of this Agreement may be amended or otherwise modified except by an instrument in writing executed by all parties hereto. 

     Section 4.05. Fees and Expenses. The Company shall pay all out-of-pocket costs and
expenses of FP, including the reasonable fees and expenses of counsel, incurred in connection with the preparation of this Agreement, or any amendment or waiver hereof, and the transactions contemplated hereby and all matters related hereto.

     Section 4.06. Governing Law. This Agreement shall be governed by, and construed in
accordance with, the laws of the State of California, without regard to the conflicts of laws rules of such state. 

     Section 4.07. Jurisdiction. The parties hereby agree that any suit, action or proceeding
seeking to enforce any provision of, or based on any matter arising out of or in connection with, this Agreement or the transactions contemplated hereby shall be brought in the United States District Court for the Northern District of California or
any California State court sitting in San Jose, California, so long as one of such courts shall have subject matter jurisdiction over such suit, action or proceeding, and that any case of action arising out of this Agreement shall be deemed to have
arisen from a transaction of business in the State of California, and each of the parties hereby irrevocably consents to the jurisdiction of such courts (and of the appropriate appellate courts therefrom) in any such suit, action or proceeding and
irrevocably waives, to the fullest extent permitted by law, any objection that it may now or hereafter have to the laying of the venue of any such suit, action or proceeding in any such court or that any such suit, action or proceeding which is
brought in any such court has been brought in an inconvenient form. Process in any such suit, action or proceeding may be served on any party anywhere in the world, whether within or without the jurisdiction of any such court. Without limiting the
foregoing, each party agrees that service of process on such party as provided in Section 4.03 shall be deemed effective service of process on such party. 

     Section 4.08. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES
ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR 

21

RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

     Section 4.09. Specific Enforcement. Each party hereto acknowledges that the remedies at
law of the other parties for a breach or threatened breach of this Agreement would be inadequate and, in recognition of this fact, any party to this Agreement, without posting any bond, and in addition to all other remedies that may be available,
shall be entitled to obtain equitable relief in the form of specific performance, a temporary restraining order, a temporary or permanent injunction or any other equitable remedy that may then be available. 

     Section 4.10. Counterparts; Effectiveness. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement shall become effective when each party hereto shall have received counterparts
hereof signed by all of the other parties hereto. 

     Section 4.11. Entire Agreement. This Agreement constitutes the entire agreement among the
parties hereto and supersede all prior and contemporaneous agreements and understandings, both oral and written, among the parties hereto with respect to the subject matter hereof and thereof, other than the Lockup Agreement. 

     Section 4.12. Captions. The captions herein are included for convenience of reference only
and shall be ignored in the construction or interpretation hereof. 

     Section 4.13. Severability. If any term, provision, covenant or restriction of this
Agreement is held by a court of competent jurisdiction or other authority to be invalid, void or unenforceable, the remainder of the terms, provisions, covenants and restrictions of this Agreement shall remain in full force and effect and shall in
no way be affected, impaired or invalidated so long as the economic or legal substance of the transactions contemplated hereby is not affected in any manner materially adverse to any party. Upon such a determination, the parties shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the parties as closely as possible in an acceptable manner so that the transactions contemplated hereby be consummated as originally contemplated to the fullest extent
possible. 

22

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their respective authorized officers as of the day and year first above written.

	 	
ULTRA CLEAN HOLDINGS, INC.	
	 	 		 	 
	 	 		 	 
	 	
By:		 /s/ Clarence L. Granger		
	 	 	
      
	
	 	 	Name: 	
Clarence L. Granger	
	 	 	Title: 	
President, Chief Executive Officer and 

Chief Operating Officer 
	 	 		 	 
	 	 		 	 
	 	 		 	 
	 	
FP-ULTRA CLEAN, LLC	
	 	 		 	 
	 	         By: FRANCISCO PARTNERS, L.P.,	
	 	
          By: Managing Member	
	 	 		 	 
	 	By: 	 /s/ Dipanjan Deb
	 	 	
  
	 	 	Name: 	Dipanjan Deb
	 	 	Title: 	Managing member, Francisco Partners GP, LLC, 

     its Managing Member

	 	 		 	 
	 	 		 	 
	 	 		 	 
	 	
LEONID AND INNA MEZHVINSKY AS 	
	 	
TRUSTEES OF THE  REVOCABLE TRUST	
	 	
AGREEMENT OF LEONID	
	 	
MEZHVINSKY AND INNA	
	 	
MEZHVINSKY DATED 28-APR-88
	 	 		 	 
	 	By: 	 /s/ Leonid Mezhvinsky 
	 	 	
  
	 	 	Name: 	Leonid Mezhvinsky
	 	 	Title: 	Trustee
	 	 		 	 
	 	 		 	 
	 	 		 	 
	 	
JOE AND JENNY CHEN AS TRUSTEES OF THE	
	 	
JOE CHEN AND JENNY CHEN	
	 	
REVOCABLE TRUST DATED 2002	
	 	 		 	 
	 	 		 	 
	 	By: 	 /s/ Joe Chen 
	 	 	
  
	 	 	Name: 	Joe Chen 
	 	 	Title: 	Trustee

	 	
    VICTOR MEZHVINSKY
	 	 	 	 	
	 	 	 	 	
	 	By: 	 /s/ Victor Mezhvinsky 
	 	 	
  
	 	 	Name: 	Victor Mezhvinsky 
	 	 	Title: 	Trustee
	 	 	 	 	
	 	 	 	 	
	 	 	 	 	
	 	
    VICTOR MEZHVINSKY AS TRUSTEE OF 	
	 	
    THE JOSHUA MEZHVINSKY 2004	
	 	
    IRREVOCABLE TRUST UNDER	
	 	
    AGREEMENT DATED JUNE 4, 2004	
	 	 	 	 	
	 	By: 	 /s/ Victor Mezhvinsky
	 	 	
  
	 	 	Name: 	Victor Mezhvinsky 
	 	 	Title: 	Trustee
	 	 	 	 	
	 	 	 	 	
	 	 	 	 	
	 	 
	 	
    THE CHEN MINORS IRREVOCABLE TRUST	
	 	 	 	 	
	 	By: 	 /s/ David Honguy Wu 
	 	 	
  
	 	 	Name: 	David Honguy Wu 
	 	 	Title: 	Trustee
	 	 	 	 	
	 	 	 	 	
	 	 	 	 	
	 	 
	 	 
	 	By:	 /s/ Winnie Wei Zhen Wu 
	 	 	

	 	 	Name:	Winnie Wei Zhen Wu
	 	 	Title:	Trustee
	 	 
	 	
    FRANK MOREMAN	
	 	 	 	 	
	 	By: 	 /s/ Frank Moreman 
	 	 	
  

EXHIBIT A

JOINDER TO REGISTRATION RIGHTS AGREEMENT

     This Joinder Agreement (this “Joinder Agreement”) is made as of the date written below by the undersigned (the “Joining Party”)
in accordance with the Amended and Restated Registration Rights Agreement dated as of June 29, 2006 (the “Amended and Restated Registration Rights Agreement”) among Ultra Clean Holdings, Inc., FP –
Ultra Clean, L.L.C. (“FP”), Leonid and Inna Mezhvinsky as trustees of the Revocable Trust Agreement of Leonid Mezhvinsky and Inna Mezhvinsky dated April 26, 1988, Joe and Jenny Chen as trustees of the Joe
Chen and Jenny Chen Revocable Trust dated 2002, Victor Mezhvinsky, Victor Mezhvinsky as trustee of the Joshua Mezhvinsky 2004 Irrevocable Trust under Agreement dated June 4, 2004, David Hongyu Wu and Winnie Wei Zhen Wu as trustees of the Chen Minors
Irrevocable Trust and Frank Moreman, as the same may be amended from time to time. Capitalized terms used, but not defined, herein shall have the meaning ascribed to such terms in the Amended and Restated Registration Rights Agreement. 

     The Joining Party hereby acknowledges, agrees and confirms that, by its execution of this Joinder Agreement and with the written consent of FP, the Joining Party shall be deemed to be a party to the Amended and
Restated Registration Rights Agreement as of the date hereof and shall have all of the rights and obligations of a “Stockholder” thereunder as if it had executed the Amended and Restated Registration Rights Agreement. The Joining Party
hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the Amended and Restated Registration Rights Agreement. 

     IN WITNESS WHEREOF, the undersigned has executed this Joinder Agreement as of the date written below. This Joinder Agreement shall not be effective unless and until FP has indicated its written consent hereof.

Date: __________
__, ____ 

	 	
    [NAME OF JOINING PARTY]	
	 	 	 	 	
	 	By: 	 	 
	 	 	
  
	 	 	Name: 	 
	 	 	Title: 	 
	 	 	 	 	
	 	
    Address for Notices:	
	 	 
	 	 
	 	 
	 	 
	 	 

FP hereby consents to the joinder of 

the Joining Party to the Registration 

Rights Agreement. 

	
    FP – Ultra Clean, L.L.C.	
	 	 	 	 	 	
	 	By: 	 	 	 
	 	 	
  	 
	 	 	Name: 	 	 
	 	 	Title:Exhibit 10.10

     AGREEMENT TO PRESERVE CORPORATE OPPORTUNITY 

          This Agreement
     is dated as of June 29, 2006, and is between Leonid Mezhvinsky (the “Securityholder”)
and Ultra Clean Holdings, Inc., a Delaware corporation (the “Parent”). 

          A. The Securityholder
     holds 73% of the shares of and is a securityholder of Sieger Engineering,
Inc. (the “Target”).

          B. Parent
     has entered into an Agreement and Plan of Merger dated as of June 29, 2006
     (the “Merger Agreement”), pursuant to which
Parent proposes to acquire all of the issued and outstanding shares of capital
     stock of the Target. This Agreement shall become effective upon the closing
     of the merger (the “Closing”) contemplated by the Merger
     Agreement, and shall have no force or effect unless and until such merger
is consummated. 

          C. In light
     of the Securityholder’s sale of his interest in the Target to the Parent, and Securityholder’s contributions in the past to the growth and development of the Target, and for the
purpose of preserving for Parent’s benefit the goodwill, proprietary rights and going concern value of the Target, and to protect Parent’s and the Target’s
business opportunities, Parent considers this Agreement integral to the transactions
contemplated by the Merger Agreement. Parent and the Securityholder agree that
the Securityholder has a substantial interest in the Target and the restrictive
covenants contained in this Agreement are reasonable and necessary to ensure
that the value of the business being purchased by Parent is not diminished. 

          NOW, THEREFORE,
     for the purposes of inducing Parent to consummate the transactions contemplated
     in the Merger Agreement and to preserve the goodwill, proprietary rights
     and going concern value of the Target, and to protect Parent’s and the Target’s
business opportunities, the parties agree as follows: 

          1. (a) In
     order to protect the confidentiality of the Target’s proprietary information and in recognition of the highly competitive nature of the industries in which the Target and its affiliates
conduct their businesses, and to protect Parent’s and the Target’s
business opportunities, the Securityholder agrees the Securityholder will not,
during and for the period commencing with the Closing and ending on the date
that is three years after the date of the Closing, on his own account or as an
employee, consultant, independent contractor, partner, owner, officer or stockholder,
engage in, be connected with, have any interest in, or aid or assist anyone else
to engage in, be connected with, or have any interest in, any firm or person
which directly competes with a line or lines of business which the Target (or
any of their Subsidiaries) was engaged in or sought to be engaged in during such
period; provided that Securityholder may (i) purchase securities in any corporation whose securities are listed or traded on a national securities exchange or in an over-the-counter securities market if such
purchases 

     do not result in Securityholder beneficially owning, directly or indirectly, at any time 5% or more of the equity securities of any such corporation, (ii) act as the director of a corporation which competes with a line or lines of
business which the Target (or any of their Subsidiaries) was engaged in or sought to be engaged in during such period and (iii) be employed by a company or firm, including a private equity firm, the primary function of which is to evaluate
acquisitions and/or divestitures; provided further, that the Parent will not unreasonably withhold consent to allow Securityholder to engage in acts that do not violate the spirit of the
agreement although such acts may otherwise be prohibited by this subsection (a).

          (b) For three years after the Closing, Securityholder shall not, directly or indirectly: (i) induce or attempt to induce any employee of the Parent or Target (or any of their affiliates) to be
employed or perform services elsewhere; provided that a general advertisement not targeted specifically at a Company employee or employees that is placed in general circulation media outlets
will not be a violation of this clause (i); or (ii) solicit or attempt to solicit the trade of any individual or entity which, at the time of such solicitation, is a customer of the Parent or Target (or any of their subsidiaries) or which the Parent
or the Target (or any of their subsidiaries) is undertaking reasonable steps to procure as a customer at the time of or immediately preceding the Closing. 

          (c) It is expressly understood and agreed that although the
	Securityholder
     and Parent consider the restrictions contained in this Section 1 to be reasonable
     for the purpose of preserving the goodwill, proprietary rights and going
     concern value of the Target and its affiliates, and to protect Parent’s and the Target’s
     business opportunities, if a final judicial determination is made by a court
     of competent jurisdiction that the time or territory or any other restriction
     contained in this Section 1 is an unenforceable restriction on the activities
     of the Securityholder, the provisions of this Section 1 shall not be rendered
     void but shall be deemed amended to apply as to such maximum time and territory
     and to such other extent as such court may judicially determine or indicate
     to be reasonable. Alternatively, if the court referred to above finds that
     any restriction contained in this Section 1 or any remedy provided in Section
     2 of this Agreement is unenforceable, and such restriction or remedy cannot
     be amended so as to make it enforceable, such finding shall not affect the
     enforceability of any of the other restrictions contained therein or the
     availability of any other remedy. The provisions of this Section 1 shall
     in no respect limit or otherwise affect the obligations of the Securityholder
under other agreements with Parent or the Target. 

          2. The Securityholder
     acknowledges and agrees that Parent’s remedy at law for a breach or
     threatened breach of any of the provisions of Section 1 of this Agreement
     would be inadequate and, in recognition of this fact, in the event of a
     breach or threatened breach by the Securityholder of any of the provisions
of 

2

     Section 1 of this Agreement, the Securityholder
     agrees that, in addition to its remedy at law, then at Parent’s option,
     all amounts then or thereafter due the Securityholder from Parent, the Target
     and any of its respective subsidiaries and other affiliates may be withheld
     to the extent permitted by law, and Parent, without posting any bond, shall
     also be entitled to seek equitable relief in the form of specific performance,
     temporary restraining order, temporary or permanent injunction or any other
     equitable remedy which may then be available. Nothing herein contained shall
     be construed as prohibiting Parent from pursuing, in addition, any other
     remedies available to it for such breach or threatened breach. The waiver
     by Parent of a breach of any provision of this Agreement by the Securityholder
     shall not operate or be construed as a waiver of a breach of any other provision
of this Agreement or of any subsequent breach by the Securityholder. 

          3. All notices under this Agreement shall be in writing and shall be effective at the earlier of the date: (a) when delivered in person at the address of the other party as set forth below, or (b)
received by the U.S. Mail, after being sent, postage prepaid, by registered or certified mail, return receipt requested, and addressed to the other party as set forth below.

          All notices to the Parent shall be addressed to: 

     Ultra Clean Holdings, Inc. 

     150 Independence Drive 

     Menlo Park, CA 94025 

     Attention: Chief Executive Officer

          All notices
     to the Securityholder shall be sent to Securityholder’s last known
address as reflected on the books and records of the Target: 

          Such addresses may be changed by notice given in accordance with this Section. 

          4. The Agreement shall be governed by the laws of the State of
	Delaware without regard to its conflict of laws principles. The parties agree that any action or proceeding with respect to this Agreement shall be brought in state or federal court residing in the State of Delaware, and the
parties agree to the jurisdiction thereof. The parties hereby irrevocably waive any objection they may now or hereafter have to the laying of venue of any such action in the said court(s), and further irrevocably waive any claim they may now or
hereafter have that any such action brought in said court(s) has been brought in an inconvenient forum. 

          5. Upon effectiveness, this Agreement shall supersede and replace any other prior agreement or understanding between the Securityholder and Parent, or its affiliates, predecessors, successors or
assigns with respect to the 

3

     subject matter hereof. This Agreement may not
     be modified, altered or changed except upon the express written consent
     of both parties. This Agreement shall inure to the benefit of and be binding
     upon Parent and the Target, their successors and assigns, including, without
     limitation, any corporation which may acquire all or substantially all of
     Parent’s or the Target’s assets or stock or with or into which Parent or the Target may be consolidated or merged, and
upon the Securityholder and the Securityholder’s heirs, executors, administrators
and legal representatives. The Securityholder acknowledges that she has not relied
on any representations, promises, or agreements of any kind made to her in connection
with her decision to sign this Agreement, except for those set forth in this
Agreement. The parties understand and agree that Paragraph headings in this Agreement
are used for convenience or reference only and shall not affect the meaning of
any provision of this Agreement. 

4

      IN WITNESS WHEREOF,
the parties have executed this Agreement as of the date first above
written. 

	 	
    ULTRA CLEAN HOLDINGS, INC. 	
	 	 	 
	 	By:	/s/ Clarence L. Granger

	 	 	

	 	 	 Name:          		Clarence L. Granger 
	 	 	 Title:
		President, Chief Executive 
	 	 	 	Officer and Chief Operating 
	 	 	 	Officer

     IN WITNESS WHEREOF,
the parties have executed this Agreement as of the date first above
written.

	 	     		SECURITYHOLDER:
	 	 	 
	 	 	/s/ Leonid
          Mezhvinsky 
	 	 	

	 	 	LEONID
          MEZHVINSKY

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