August 21 2012 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, August 21, 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 Credit Suisse Funds AG, Kalandergasse 4, 8045 Zürich (Contact: Thu Hong Pham, Credit Suisse AG, Tel +41 44 333 7118), this company holds with a total of 65,760 shares 2.99%, i.e. less than the 3% reporting threshold, of the voting rights in INFICON Holding AG since a sale on August 16, 2012.