Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland - August 11, 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 August 8, 2008 UBS Fund Management (Switzerland) AG, PO Box, 4002 Basel (contact person Jasmin Gahler, + 41 44 239 6201) held 107,788 registered shares of INFICON Holding AG. This equals 5.03% of the voting rights in INFICON Holding AG.