Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, February 25, 2013 — 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 February 22, 2013 from UBS Fund Management (Switzerland) AG, PO Box, 4002 Basel, this company holds now since a purchase on February 19, 2013 with 110,303 registered shares a total of 5.03% of the voting rights in INFICON Holding AG.