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Copyright 2007 by Ultra Clean Technology. All Rights Reserved.

FOR IMMEDIATE RELEASE
Editorial Contact: Jack Sexton
VP & CFO
Ultra Clean Technology
(650) 617-4100

JUNE 26, 2007



Ultra Clean Vindicated in 7 of 8 Patents, Despite Mixed Verdict

MENLO PARK, CA, JUNE 26, 2007 — Ultra Clean Holdings, Inc. (NASDAQ: UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc. (UCT), a leading developer and supplier of critical subsystems for the semiconductor capital equipment industry, announced today that a verdict has been reached with respect to patent infringement claims brought against it by Celerity, Inc. On June 25, 2007, a jury found that UCT did not infringe one of the two patents at issue in the trial, but did infringe the other. Prior to trial, the United States District Court for the Northern District of California issued a summary judgment that UCT did not infringe four of Celerity's patents which Celerity claimed had been infringed by UCT. In addition, Celerity had previously withdrawn claims of infringement by UCT of two of its other patents.

Celerity had alleged that UCT's Predator™ gas delivery technology infringed eight of Celerity's patents. However, Celerity ultimately prevailed with respect to only one of the eight patents. The jury awarded Celerity damages of $13,900. UCT's Predator had not reached production, and accordingly the verdict will not have a material adverse effect on UCT's operating results or financial condition.

"We respect the intellectual property rights of others," said Clarence Granger, Chairman and Chief Executive Officer of UCT. "We are happy that we were vindicated with respect to seven of the patents for which infringement was claimed, but were disappointed with the jury's verdict on the eighth patent. We are currently reviewing the decision with our counsel with a view toward making a determination as to whether we will appeal the jury’s decision."

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 http://www.u ct.com.

Safe Harbor Statement
This press release contains, or may be deemed to contain, "forward-looking statements" (as defined in the U.S. Private Securities Litigation Reform Act of 1995) which reflect Ultra Clean Holdings, Inc.'s current views with respect to future events and financial performance. Ultra Clean Holdings, Inc. uses words such as "anticipates," "believes," "plans," "expects," "future,"' "intends," "may," "will," "should," "estimates," "predicts," "potential," "continues" and similar expressions to identify these forward-looking statements.  All forward-looking statements address matters that involve risks and uncertainties. Accordingly, you should not rely on forward-looking statements, as there are or will be important factors that could cause our actual results, as well as those of the markets we serve, levels of activity, performance, achievements and prospects to differ materially from the results predicted or implied by these forward-looking statements. These risks, uncertainties and other factors include, among others, those identified in "Risk Factors," "Management's Discussion and Analysis of Financial Condition and Results of Operations" and elsewhere in our Annual Report on Form 10-K for the year ended December 31, 2006 and our Quarterly Report on Form 10-Q for the quarter ended March 30, 2007 filed with the Securities and Exchange Commission. Ultra Clean Holdings, Inc. undertakes no obligation to publicly update or review any forward-looking statements, whether as a result of new information, future developments or otherwise.


 
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