X0609 4 2026-05-08 0 0001275014 Ultra Clean Holdings, Inc. UCTT 0001791106 Cho Paul Yoonku false ULTRA CLEAN HOLDINGS, INC. 26462 CORPORATE AVENUE HAYWARD CA 94545 0 1 0 0 General Counsel and Secretary 0 Common Stock 2026-05-08 4 S 0 2000 86.8901 D 15844 D /s/ Paul Y. Cho 2026-05-12