09.19.05

ULTRA CLEAN TO PRESENT AT BANK OF AMERICA 35TH ANNUAL INVESTMENT CONFERENCE

MENLO PARK, CA, September 19, 2005 /PRNewswire — Ultra Clean Holdings, Inc. (Nasdaq: UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., announced that Jack Sexton, Chief Financial Officer, and Sowmya Krishnan, Chief Technical Officer, will address the Bank of America 35th Annual Investment Conference to be held at the Ritz-Carlton Hotel in San Francisco, CA on Thursday, September 22nd, 2005 at 10:30 am Pacific time.

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. A replay of the webcast will be available after the live presentation.

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.