June 10 2015 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, June 10, 2015 – 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, announced today:

According to a notification signed on June 8, 2015 by Henderson Global Investors, 201 Bishopsgate, London, EC2M 3AE, UK (Contact: Scott Dickenson, Henderson Global Investors, 201 Bishopsgate, London, EC2M 3AE, UK, Tel +44 20 7818 4184), this company holds due to an in-specie transfer of 40,389 registered shares agreed on June 5 2015 and executed on June 8, 2015 now with 44,569 registered shares less than 3% (i.e. 1.91%) of the voting rights in INFICON Holding AG.