MENLO PARK, CA, DECEMBER 22, 2005 /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 Jack Sexton, Chief Financial Officer, will address the Needham & Company 8th Annual Growth Conference at the New York Palace Hotel in New York on Tuesday, January 10th, 2006 at 5:00 pm EST.

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, producing primarily gas delivery systems. Ultra Clean offers its customers a complete outsourced solution for gas delivery and other subsystems, 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.