11.29.04

ULTRA CLEAN TO PRESENT AT CREDIT SUISSE FIRST BOSTON 2004 ANNUAL TECHNOLOGY CONFERENCE

MENLO PARK, CA, November 29, 2004/PRNewswire — Ultra Clean Holdings, Inc. (Nasdaq: UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., announced that Clarence Granger, President and Chief Executive Officer, and Phillip Kagel, Senior Vice President and Chief Financial Officer, will address the Credit Suisse First Boston 2004 Annual Technology Conference in Scottsdale, AZ on Wednesday, December 1 at 3:00 pm (MT).

A link to the webcast will be available on the Investor Relations section of the Company's website at www.uct.com during the live presentation at 3:00 pm (MT). A replay of the webcast will be available for seven days after the webcast.

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