Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, October 9, 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 on October 9, 2012 from Credit Suisse Funds AG, Kalandergasse 4, 8045 Zürich (Contact: Carmen Casellas Staub, Credit Suisse AG, phone +41 44 333 6924) this company holds with a total of 67,713 shares 3.09% of the voting rights in INFICON Holding AG since a purchase on October 4, 2012.