uct press

04.20.04

Ultra Clean To Announce First Quarter 2004 Results

MENLO PARK, CA, April 20, 2004—(PR Newswire) — Ultra Clean Holdings, Inc. (NASDAQ:  UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., will release first quarter 2004 financial results on Thursday, April 29, 2004, after markets close.

The Company will host a conference call to discuss first quarter 2004 financial results and management’s outlook at 2:00 p.m. PST on Thursday, April 29, 2004.  Contact information for the conference call is as follows:

Live Call for Participants:
               Domestic: 800-905-0392
               International: 785-832-2422
               The conference ID is: "UltraClean."

Replay (available for 48 hours after live call):
               Domestic: 800-283-8486
               International: 402-220-0869

We will also webcast the conference call live on our website at www.uct.com under Investor Relations.  A telephonic replay of the conference call will be available until 5:00 p.m. PST on May 13, 2004 on our website at www.uct.com under Investor Relations.

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.

Safe Harbor
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," "continue" 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 the Company’s S-1 registration statement 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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