Jinsong Xiao - 02 Sep 2025 Form 3 Insider Report for Ultra Clean Holdings, Inc. (UCTT)

Role: Chief Executive Officer
Signature: /s/ Paul Y. Cho, as attorney-in-fact for Jinsong Xiao
Issuer symbol: UCTT
Transactions as of: 02 Sep 2025
Net transactions value: $0
Form type: 3
Filing time: 16 Sep 2025, 21:20:46 UTC
Next filing: 30 Sep 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Xiao Jinsong	Chief Executive Officer	ULTRA CLEAN HOLDINGS, INC., 26462 CORPORATE AVE., HAYWARD	/s/ Paul Y. Cho, as attorney-in-fact for Jinsong Xiao	16 Sep 2025	0002086234

No securities are beneficially owned.

Remarks:

Due to an administrative delay, this initial statement of beneficial ownership of securities was not timely filed. No securities are beneficially owned. Exhibit 24 - Power of Attorney