May 7 2013 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Bad Ragaz / Switzerland — May 7, 2013 — INFICON Holding AG (SIX Swiss Exchange: IFCN), a leading, worldwide manufacturer of instrumentation and process control software for advanced industrial vacuum processes, today announced that according to a notification signed on May 6, 2013, a group consisting of Beat Frey, Brigitte Frey, Vanessa Frey and Alexandra Frey own as economic beneficiaries through KWE Beteiligungen AG, c/o Corisol Holding AG, Grafenaustrasse 15, 6300 Zug (contact person Vanessa Frey, +41 (0)41 760 3028) an unchanged total of 440,482 registered shares of INFICON Holding AG and Vanessa Frey holds additionally 450 Call Options. Due to a capital increase through newly listed conditional capital, the group now holds less than 20% of the voting rights in INFICON. The number of shares equals 19.6490% of the voting rights, the Call options (ratio 1:1; Strike price CHF 284.75; expiration date May 2, 2020) represent 0.02007% of the Voting rights.