MENLO PARK, CA, MAY 24, 2007 /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, will address the Cowen and Company 35th Annual SMid-Cap Technology Conference. The conference will be held at the New York Palace  Hotel 455 Madison Avenue at 50th Street in New York on Wednesday, May 30th, 2007 at 9:55AM Daylight Savings 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 approximately one hour 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.