Ultra Clean to Present at the Jefferies 2012 Global Technology, Media & Telcom Conference

Ultra Clean Holdings, Inc. (Nasdaq: UCTT), a developer and supplier of critical subsystems, for the semiconductor capital equipment, medical device, energy, research, and flat panel industries, announced that Clarence Granger, Chairman and Chief Executive Officer, and Casey Eichler, Chief Financial Officer, will address the Jefferies 2012 Global Technology, Media & Telcom Conference. The presentation will take place in New York City, New York on Monday, May 7th, 2012 at 9:00 AM Eastern Standard 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, medical device, energy, research, and flat panel industries. Ultra Clean Technology offers its customers a complete outsource solution for a variety of complex modules ranging from liquid & gas delivery systems to turnkey system integration. Ultra Clean Technology’s customers are primarily original equipment manufacturers for the semiconductor capital equipment, flat panel, energy, and medical device industries. Ultra Clean is headquartered in Hayward, California. Additional information is available at www.uct.com.