August 11 2010 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Bad Ragaz / Switzerland - August 11, 2010 - INFICON Holding AG (SIX Swiss Exchange: IFCN), a leading, worldwide manufacturer of instrumentation and process control software for advanced industrial vacuum processes, today announced that according to a notification signed on August 10, 2010, Beat Frey, Wollerau, owns as economic beneficiary through KWE Beteiligungen AG, c/o Corisol Holding AG, Grafenaustrasse 15, 6300 Zug (contact person Beat Frey, +41 (0)41 760 3026) a total of 430,046 registered shares of INFICON Holding AG since a purchase on August 9, 2010. This represents 20.002% of the voting rights in INFICON Holding AG.