MENLO PARK, CA, JANUARY 22, 2007 / PRNewswire — Ultra Clean Holdings, Inc. (Nasdaq: UCTT), the parent company of Ultra Clean Technology Systems and Service, Inc., will release fourth quarter 2006 financial results on Monday, February 12, 2007 after markets close.

The Company will host a conference call to discuss fourth quarter 2006 financial results and management's outlook at 2:00 pm PST on Monday, February 12, 2007. The call-in number is 888/343-7268 (domestic) and 415/537-1988(international).  A replay of the conference will be available for fourteen days following the call at 800/633-8284 (domestic) and 402/977-9140 (international).  Confirmation number for live broadcast and replay is 21326304 (all callers).

Ultra Clean will also webcast the conference call live on our website at www.uct.com under Investor Relations.