MENLO PARK, CA, September 13, 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 Phil Kagel, Senior Vice President and Chief Financial Officer, will address the Banc of America Securities 34th Annual Investment Conference on Wednesday, September 22 at 4:30 pm (PT).

A webcast of the proceedings will be available on the Company’s website and may be accessed via the following links:

Formal Presentation/Q&A:
http://www.veracast.com/webcasts/bas/34th-annual-2004/id85317421.cfm

Breakout Session:
http://www.veracast.com/webcasts/bas/34th-annual-2004/id66318924.cfm

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.