August 22 2012 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, August 22, 2012 — 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 that according to a notification received from Polar Capital LLP, 4 Matthew Parker Street, London SW1H 9NP (Contact: Stephen Amoah, Polar Capital LLP, +44 (0)207 227 2700, operations@polarcapital.co.uk) this company holds with a total of 59,066 shares 2.72%, i.e. less than the 3% reporting threshold, of the voting rights in INFICON Holding AG since a sale on August 14, 2012.