April 18 2012 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Bad Ragaz, Switzerland, April 18, 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, today announced that according to a notification received from Sterling Strategic Value Ltd., Vanterpool Plaza, Wickhams Cay 1, Roadtown, Tortola (VG), this company has sold all its shares in INFICON Holding AG as per April 14, 2012. Dr. Tito Tettamanti, Via San Michele 4, CH-6979 Castagnola, controls 100% of Gritlot Ltd., Basement Store/Office, 3 Kingswood Grove, Douglas, IM1 3LY, Isle of Man, which controls 100% of the voting shares of Sterling Value Ltd.