X0306 4 2022-11-11 0 0001275014 Ultra Clean Holdings, Inc. UCTT 0001550421 Chinnasami Vijayan S. ULTRA CLEAN HOLDINGS, INC. 26462 CORPORATE AVENUE HAYWARD CA 94545 0 1 0 0 Chief Operating Officer Common Stock 2022-11-11 4 S 0 5000 35.08 D 162570 D This is the weighted average sale price. Shares were sold in multiple transactions at prices from $35.00 to $35.18. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4. /s/ Paul Y. Cho, as attorney-in-fact for Vijayan S. Chinnasami 2022-11-15