MENLO PARK, CA, DECEMBER 11, 2006 / PRNewswire —Ultra Clean Holdings, Inc. (Nasdaq:  UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., announced that Clarence Granger, Chairman and Chief Executive Officer, and Jack Sexton, Chief Financial Officer, will address the Needham & Company 9th Annual Growth Conference at the New York Palace Hotel in New York on Tuesday January 9th, 2007 at 11:30 am 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. Ultra Clean 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. Ultra Clean's customers are primarily original equipment manufacturers of semiconductor capital equipment. Ultra Clean is headquartered in Menlo Park, California. Additional information is available at www.uct.com.