uct press

07.10.06

Ultra Clean Holdings, Inc. Announces SEMICON West
Analyst and Investor Briefing

MENLO PARK, CA, JULY 10, 2006 /PRNewswire — Ultra Clean Holdings, Inc. (Nasdaq: UCTT), announced today it will hold a briefing lunch for analysts and investors in conjunction with SEMICON West 2006. The briefing will be held at 11:30 a.m. Pacific Time on Wednesday, July 12, 2006 at the Palace Hotel in San Francisco.

If you are interested in attending the briefing lunch, please contact:
Jack Sexton, CFO
650.617.4121

About Ultra Clean Holdings, Inc.
Ultra Clean Holdings, Inc. is a developer and supplier of critical subsystems for the semiconductor and flat panel capital equipment industries. UCTT offers its customers an integrated outsourced solution for gas delivery systems and other subassemblies, improved design-to-delivery cycle times, component neutral design and manufacturing and component testing capabilities. UCTT's customers are primarily original equipment manufacturers of semiconductor capital equipment. UCTT is headquartered in Menlo Park, California. Additional information is available at www.uct.com.