February 19 2007 Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland — February 19, 2007 — INFICON Holding AG (SWX 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 Bank Julius Baer & Co. Ltd, Bahnhofstrasse 36, 8010 Zürich, its equity participation in INFICON Holding AG had fallen below 5% on February 15, 2007, but increased to 5.26% of the voting rights in INFICON Holding AG on February 16, 2007 with a total of 122,823 registered shares at CHF 5 par value.
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