Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Bad Ragaz / Switzerland - May 28, 2009 - 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 Pictet Funds SA, Route des Acacias 60, 1211 Genève (Contact: Michel Sermet, +41 58 323 2166) disclosed in a notification signed on May 25, 2009 that it held via Pictet (CH) Swiss Mid Small Cap 2.33% - Pictet (CH) Swiss Equities 0.86% - Ethos Mid & Small Cap 0.79% - Pictet (CH) Enhanced 0.49% - Pictet Ethos (CH) Sustainable Swiss Equities 0.17% - Pictet (CH) Swiss Market Tracker 0.13% - Ethos CH Indexed Corp Gov 0.09% - PI Swiss Equities 0.09% - PI Swiss Equities Tracker 0.08% - Pictet Funds (CH) Swiss Equities Pool 0.02% - Subvenimus Institutional Funds 0.01% - a total of 108,572 registered shares of INFICON Holding AG at CHF 5 par value each since a purchase on May 20, 2009. This represents 5.06% of the voting rights in INFICON Holding AG.