September 30 2008 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland - September 30, 2008: INFICON Holding AG (SIX 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 26, 2008 UBS Fund Management (Switzerland) AG, PO Box, 4002 Basel (contact person Jasmin Gaehler, UBS, PO Box, 8098 Zürich, +41 44 239 6201) holds 108,213 registered shares of INFICON Holding AG following a purchase on September 23, 2008. This equals 5.05% of the voting rights in INFICON Holding AG.