December 3 2013 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, December 3, 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 signed on November 29, 2013 by 1832 Asset Management L.P., (One Adelaide Street East, Suite 2900, Toronto, Ontario M5C 2V9, Canada: Contact: David Fingold, Tel 416-365-8897, Fax 416-865-3463), this company holds on behalf of one or more mutual funds or other client accounts managed by it since a purchase on November 26, 2013 with 69,820 registered shares a total of 3.11% of the voting rights in INFICON Holding AG.