August 12 2010 Disclosure of Equity Participation

Bad Ragaz / Switzerland - August 12, 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 Vontobel Fonds Services AG, Gotthardstrasse 43, 8002 Zurich (Contact: Reto Storchenegger, Vontobel Fonds Services AG, 8022 Zurich, Tel. +41 58 283 61 57, Fax +41 58 283 7435) holds less than 3% of the voting rights in INFICON Holding AG since a sale on August 9, 2010.