Disclosure of Equity Participations Pursuant to the Swiss Stock Exchange Act

Syracuse, New York/Zurich, Switzerland — February 21, 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 has fallen below 5% on February 20, 2007.