Other Information
−Removed: The following exhibits are filed with this quarterly Report on Form 10-Q for the quarter ended September 26, 2025:
−Removed: 10.1 Severance Benefits for Executive Officers, dated as of August 1, 2025
−Removed: 10.2 Chief Executive Officer Change in Control Severance Plan, dated as of September 2, 2025
−Removed: 10.3 Chief Business Officer Change in Control Severance Plan , dated as of August 24 , 2025
+Added: The following exhibits are filed with this quarterly Report on Form 10-Q for the quarter ended March 27, 2026:
+Added: Description Form Exhibit Filing Date Filed
31.1 Certification of Interim Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 .
2 unchanged sentences
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
+Added: 10.1 Ninth Amendment, dated as of February 26, 2026, by and among Ultra Clean Holdings, Inc., the subsidiaries of Ultra Clean Holdings, Inc.
+Added: party thereto, Barclays Bank PLC, as administrative agent and the lenders party thereto.
+Added: 10.2 Form of Confirmation for Capped Call Transactions.
+Added: 8-K 10.1 March 3, 2026
+Added: 4.1 Indenture, dated as of March 3, 2026, between Ultra Clean Holdings, Inc.
+Added: Bank Trust Company, National Association, as trustee.
+Added: 8-K 4.1 March 3, 2026
+Added: 4.2 Form of certificate representing the 0.00% Convertible Senior Notes due 2031 (included as Exhibit A to Exhibit 4.1).
+Added: 8-K 4.2 March 3, 2026
101.INS Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
5 unchanged sentences
104 Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)
−Removed: *Filed herewith
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
ULTRA CLEAN HOLDINGS, INC.
−Removed: October 29, 2025
+Added: April 29, 2026
/S/ JAMES XIAO
2 unchanged sentences
authorized signatory)
−Removed: October 29, 2025
+Added: April 29, 2026
/S/ SHERI SAVAGE
3 unchanged sentences
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.