MENLO PARK, CA, (PR Newswire) — May 13, 2004 — Ultra Clean Holdings, Inc. (NASDAQ:  UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., today announced that Ultra Clean  has received awards for outstanding quality and service from Novellus Systems, Inc. at their annual Supplier Recognition Day on April 29.

2003 marks the sixth year that Ultra Clean has been recognized by Novellus in this forum and the second year the company has received awards for both service and quality.  Ultra Clean was one of just 23 top-tier suppliers recognized by Novellus for exemplary performance in the past year, and one of only two suppliers to receive both quality and service awards.

In presenting the Quality Gas Systems Supplier award to Ultra Clean, Wayne Bennett, Director of Supplier Quality for Novellus, praised Ultra Clean for their high level of service and support. "";Both engineering and field service are available around the clock, and their cultural attention to quality is outstanding," commented Bennett. "UCT has aligned their operations and service organizations to meet and exceed our needs."

"We have worked closely with Novellus to enhance our performance through a sustainable, systematic process," said Syed Zaidi, Ultra Clean’s Director of Quality Assurance. "Our key performance metrics are tracked and reported on a regular basis, and self-assessment is an integral part of our quality culture."

"Ultra Clean and Novellus have a long history of collaboration and partnership,"said Clarence Granger, Ultra Clean’s President and Chief Executive Officer. "We are extremely pleased to be recognized by Novellus and for their confidence in our ability to meet their most demanding expectations for quality, delivery and service. We look forward to continued collaboration as we meet the challenges and opportunities ahead."

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.

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