February 25 2009 Disclosure of Equity Participation Pursuant to the Swiss Stock Exchange Act

Bad Ragaz/Switzerland, February 25, 2009. INFICON Holding AG (SIX Swiss Exchange: IFCN), a leading, worldwide provider of instrumentation and process control software for advanced industrial vacuum processes, today announced, that according to a notification received on February 24, 2009 by Polar Capital LLP, 4 Matthew Parker Street, London SW1H 9NP (Contact: Gopal Bharj, Polar Cpaital Forager Fund, 4 Matthew Parker Street, London SW1H 9NP, Tel: +44 (0)207 227 2700, Email: operations@polarcapital.co.uk) the company now holds less than 3%, namely 2.80% of the voting rights in INFICON Holding AG following a sale which took place on February16, 2009.

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Matthias Troendle
Chief Financial Officer
+423 388 3510
matthias.troendle@inficon.com