September 16 2008 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland - September 16, 2008: INFICON Holding AG (SWX Swiss Exchange: 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 signed on September 12, 2008 UBS Fund Management (Switzerland) AG, PO Box, 4002 Basel (contact person Cintia Gurtz, UBS, PO Box, 8098 Zurich, +41 44 239 9697) holds 105,783 registered shares of INFICON Holding AG following a sale on September 9, 2008. This equals 4.94% of the voting rights in INFICON Holding AG.

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

European Contact
Bernhard Schweizer
sensus PR GmbH
+41.43.366.5511
inficon@sensus.ch