On April 4, 2024, Ultra Clean Holdings, Inc. (the ?Company?), Barclays Bank PLC, as administrative agent, and the lenders party thereto, entered into that certain Sixth Amendment dated as of April 4, 2024 (the ?Sixth Amendment?) to the Credit Agreement dated as of August 27, 2018 (as amended as of October 1, 2018, March 31, 2021, August 19, 2022, June 29, 2023 and July 27, 2023 (the ?Existing Credit Agreement?), and the Existing Credit Agreement as further amended by the Sixth Amendment, the ?Credit Agreement?). Pursuant to the Sixth Amendment, the Existing Credit Agreement was amended to, among other things, (i) extend the final maturity date of the term loan and revolving credit facilities under the Credit Agreement by 30 months and (ii) reduce the interest rate applicable to the term loan facility under the Credit Agreement by 0.25% per annum. Barclays Bank PLC, HSBC Securities (USA) Inc. and Sumitomo Mitsui Banking Corporation acted as joint lead arrangers and joint bookrunners in connection with the amended credit facilities.

Barclays Bank PLC is acting as sole administrative agent and collateral agent. SIXTH AMENDMENT dated as of April 4, 2024 (this ?Amendment?) to the Credit Agreement dated as of August 27, 2018 (as amended as of October 1, 2018, March 31, 2021, August 19, 2022, June 29, 2023, July 27, 2023 and as the same may have been further amended, supplemented or otherwise modified prior to the Amendment Effective Date (as defined below), the ?Existing Credit Agreement?), among ULTRA CLEAN HOLDINGS, INC., a Delaware corporation (the ?Parent Borrower?), any Subsidiary Borrowers (as defined therein) from time to time parties thereto, the several banks and other financial institutions or entities from time to time parties thereto (the ?Lenders?) and BARCLAYS BANK PLC, as administrative agent (in such capacity, the ?Administrative Agent?) is entered into by and among the Parent Borrower, the other Loan Parties, the Sixth Amendment Replacement Term Lenders party hereto, the Sixth Amendment Incremental Term Lenders party hereto, the Consenting Revolving Lenders, the Consenting Term Lenders party hereto and the Administrative Agent. WHEREAS, the Parent Borrower has notified the Administrative Agent and the Lenders party hereto of its request that (i) the Term B Loans outstanding under the Existing Credit Agreement immediately prior to the Amendment Effective Date (the ?Existing Term Loans?) be refinanced and replaced in full in accordance with the penultimate paragraph of Section 10.1 of the Existing Credit Agreement with Replacement Term Loans under and as defined in the Existing Credit Agreement in an aggregate principal amount of $475,377,928.05 and (ii) immediately after giving effect to the incurrence of such Replacement Term Loans and the Refinancing, pursuant to Section 2.24(a) of the Refinanced Credit Agreement, the Parent Borrower obtain Incremental Term Loans under and as defined in the Refinanced Credit Agreement in an aggregate principal amount of $24,622,071.95; WHEREAS, (i) each Term Lender with Existing Term Loans immediately prior to the Amendment Effective Date (each, an ?Existing Term Lender?) that executes and delivers a Continuing Term Lender Addendum in the form attached hereto as Annex A (a ?Lender Addendum?) indicating the ?Cashless Settlement Option?

has agreed to convert and/or continue all of its Existing Term Loans as Sixth Amendment Replacement Term Loans (such converted and/or continued Existing Term Loans subject to the Cashless Rollover (as defined below), the ?Continuing Term Loans?, and such Existing Term Lenders, collectively, the ?Continuing Term Lenders?) in an aggregate principal amount equal to such Continuing Term Lender?s Cashless Settlement Allocated Amount, in each case subject to the terms and conditions set out herein and (ii) each Existing Term Lender that executes and delivers a Lender Addendum indicating the ?Post-Closing Settlement Option? (each, a ?Post-Closing Option Term Lender? and, together with the Continuing Term Lenders, collectively, the ?Consenting Term Lenders?) has agreed to have 100% of the outstanding principal amount of its Existing Term Loans prepaid on the Amendment Effective Date and purchase by assignment Sixth Amendment Replacement Term Loans on or after the Amendment Effective Date in an aggregate principal amount equal to such Post-Closing Option Term Lender?s Cash Settlement Allocated Amount; WHEREAS, each Person (other than a Consenting Term Lender in its capacity as such) that executes and delivers this Amendment as an ?Additional Replacement Term Lender?

(each, an ?Additional Replacement Term Lender? and, together with the Consenting Term Lenders, the ?Sixth Amendment Replacement Term Lenders?) has agreed to make Replacement Term Loans to the Parent Borrower on the Amendment Effective Date (the ?Additional Replacement Term Loans? and, together with the Continuing Term Loans, collectively, the ?Sixth Amendment Replacement Term Loans?) in an aggregate principal amount not to exceed such Additional Replacement Term Lender?s Sixth Amendment Replacement Term B Commitment, and the proceeds of which will be applied to repay in full the outstanding aggregate principal amount of the Existing Term Loans that are not subject to the Cashless Rollover (including, for the avoidance of doubt, to repay in full the Existing Term Loans of the Post-Closing Option Term Lenders), in each case subject to the terms and conditions set out herein.