Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, October 19, 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 18, 2012 from Lombard Odier Asset Management (Switzerland) SA, Avenue des Morgines 6, 1213 Petit-Lancy (GE), (Contact: Cinzia Dotta; c.dotta@lombardodier.com; Tel. 022 7092598) this company now holds through LO Funds (CH) Swiss Cap, IF IST 2 Actions Suisses SPI Plus, IF IST 2 Actions Suisses Val.Compl., VF (CH) – Valiant Swiss Equities SPI Index, and VF (CH) – Valiant Actions Small & Mid Caps, a total of 77,903 shares, with 3.55% of the voting rights in INFICON Holding AG since a purchase on October 17, 2012.