February 8 2007 Disclosure of Equity Participations pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland — February 8, 2007— INFICON Holding AG (SWX Swiss Exchange and NASDAQ: IFCN), a leading manufacturer of vacuum instrumentation and process control software for the semiconductor and related industries and other industrial applications, today announced that according to a notification received on February 8, 2007 from Zürcher Kantonalbank, Bahnhofstrasse 9, Postfach, 8010 Zürich, the bank's holdings in INFICON Holding AG fell below the 5% threshold of the voting rights on February 7, 2007.

Corporate Contact
Betty Ann Kram
Director Global Communications
+1.315.434.1122
BettyAnn.Kram@inficon.com

European Contact
Bernhard Schweizer
sensus pr GmbH
+41 (0) 043 366 5511
inficon@sensus.ch