MENLO PARK, CA, MAY 2, 2007 — Ultra Clean Holdings, Inc. (NASDAQ: UCTT), the parent company of Ultra Clean Technology (UCT), a leading developer and supplier of critical subsystems for the semiconductor capital equipment and advanced medical device industries, announced today that it has been awarded "Outstanding Supplier" status by Lam Research Corporation. This prestigious award recognizes the achievements of a select list of top tier suppliers.

"Outstanding Supplier" Award for 2006
Ultra Clean Technology received the award on March 14th, 2006 at the Lam Research Corporation annual Supplier Day conference. This year, 56 suppliers were nominated for the award. The screening process utilizes Lam's carefully devised Quality Scorecard. UCT led the field of six top suppliers with the highest overall score for 2006. Additionally, Ultra Clean posted the greatest year-over-year improvement as well.

UCT provides Fremont, CA-based Lam Research Corporation with a variety of critical subsystems used in advanced wafer fabrication systems. Two of these subsystems are unique, high precision modules designed for use in the innovative Lam Microwave Stripper and the 2300 ® Strip45TM Systems. These next-generation solutions from Lam Research employ proprietary technology and can be used throughout the semiconductor manufacturing process.

About Ultra Clean Holdings, Inc.
Ultra Clean Holdings, Inc. is a developer and supplier of critical subsystems for the semiconductor capital equipment and medical device manufacturing industries. Ultra Clean offers its customers a complete outsourced solution for a wide variety of complex modules ranging from liquid and gas delivery systems to robotic device assemblies. The company can facilitate improved design-to-delivery cycle times and enable their customers to focus on R&D, product development and other core competencies. Ultra Clean's customers are primarily original equipment manufacturers of semiconductor capital equipment and complex medical devices. The Company is headquartered in Menlo Park, California with facilities in South San Francisco, California; Portland, Oregon; Austin, Texas and Shanghai, China. Additional information is available at www.uct.com.