July 25 2012 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, July 25, 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: Carmen Casellas, Credit Suisse AG, phone +41 44 333 6924), this company holds with a total of 66,963 shares 3.05% of the voting rights in INFICON Holding AG since a purchase on July 19, 2012.